This is where the Effluent Treatment Plant (ETP) process in the textile industry plays a crucial role ensuring that wastewater is treated, safe and compliant with environmental standards.

What is an ETP in the Textile Industry?

An Effluent Treatment Plant (ETP) is a specialized facility that treats industrial wastewater. The aim is to remove harmful contaminants so that water can either be safely discharged into the environment or recycled for reuse in processes.

Stages of the ETP Process

• Primary Treatment – This stage removes large debris, fibers and floating particles physically via screening and grit chambers. Neutralization of acidic or alkaline effluents, followed by coagulation and sedimentation to remove suspended solids and dyes.
• Secondary Treatment – Secondary treatment uses different types of bacteria that live in different environments: with oxygen (aerobic), and without oxygen (anoxic). These break down organic material and remove nutrients. Next, the sewage flows into large settling tanks called clarifiers. Here, the heavier sludge sinks to the bottom and is sent for further treatment, while the clearer water known as secondary effluent moves onward for tertiary treatment
• Tertiary Treatment – In the final stage, the water is thoroughly cleaned and disinfected using advanced methods like ozone disinfection, biological filters, UV light and chlorine. This ensures it is clear, safe, and ready to be released back into the environment.

Modern ETPs can be made more efficient with advanced membranes, energy-saving aeration and smart dosing systems reducing both operational costs and environmental impact.

Together, these stages ensure that the treated water meets strict environmental discharge norms and, in many cases, can even be reused within the facility.

Why is the ETP Process important in the Textile Industry?

The ETP process is more than a compliance checkbox for the textile industry because it is central to the industry’s sustainability journey.

• Regulatory Compliance: Pollution Control Boards (CPCB/SPCB) enforce strict norms for effluent discharge. Non-compliance can result in penalties, factory closures and loss of buyers. ETPs prevent contamination of rivers, soil, and groundwater by removing dyes, salts, and toxic substances.
• Global Market Access: Buyers increasingly demand sustainable textile manufacturing. International standards like ZDHC (Zero Discharge of Hazardous Chemicals), GOTS (Global Organic Textile Standard), and OEKO-TEX® also mandate safe wastewater treatment. Adhering to compliance standards enhances reputation and improves access to international markets.

The Role of Water Quality Testing in ETP Performance

Installing an ETP is just the beginning. Its performance must be validated with regular water testing to ensure compliance and environmental safety.

• Verifying ETP Efficiency – Wastewater testing confirms that BOD, COD, and other parameters are within permissible limits.
• Preventing Environmental Risks – Groundwater testing detects early signs of contamination around industrial sites.
• Audit and Certification Readiness – Standards like ZDHC, GOTS, OEKO-TEX®, and drinking water norms require authentic test reports. Routine testing ensures your facility is always audit-ready for regulators, certifications, and buyer audits.

ATIRA’s Ecology Testing Lab: Your Partner in compliance and sustainability

With over 19 years of experience as a Schedule 1 Auditor for GPCB, ATIRA brings proven expertise in connecting ETP operations with compliance and sustainability. Our Ecology Testing Lab offers comprehensive, accredited water testing services tailored to the textile industry to validate the ETP performance and meet CPCB, ZDHC and GOTS requirements.

With state-of-the-art infrastructure, technical expertise, and industry experience, ATIRA’s Ecology lab is equipped to conduct testing for various Ecological and Environmental requirements like:

• Heavy metals
• Polycyclic Aromatic Hydrocarbons (PAH)
• Poly Chlorinated biphenyls (PCB)
• Pesticides
• Water and Waste water parameters and many more

ATIRA’s ecology lab also empowers textile, chemical and dyestuff manufacturers to stay compliant with local and global standards, build credibility with global buyers and demonstrate commitment to sustainability by providing reliable and credible testing for parameters like:

• Heavy metals
• Alkylphenol Ethoxylate (AP & APEO)
• Azo Free Banned Amines
• Diethyl phenyl acetamide (DEPA)
• Allergenic dyes
• Polycyclic Aromatic Hydrocarbons (PAH)
• Poly Chlorinated biphenyls (PCB)
• Chlorophenols
• Toxic Parameters

Partner with ATIRA’s Ecology Lab to translate compliance into a competitive advantage and sustainability into a lasting commitment.

For more details, please reach out at jyoti.taskar@atira.in

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Understanding Reactive Dyes

Reactive dyes are widely used for dyeing cotton garments due to their strong covalent bonding with cellulose fibers. These dyes contain dichlorotriazine groups, which form a bond with the fiber through substitution or addition reactions in an aqueous solution. This strong bond (with energy ranging from 80-100 kcal/mol) ensures the dye becomes an integral part of the fiber.

Key components of reactive dyes include:

• Reactive Group (R): Contains chlorine, fluorine, alkyl sulphones, or quaternary ammonium groups.
• Bridging Group (B): Links the reactive systems with the chromophore.
• Chromophore (C): Responsible for the dye’s color, including groups such as azo (-N=N-), anthraquinone, phthalocyanine, and triphenylmethane.
• Solubilizing Group (S): Allows the dye to dissolve in aqueous solutions for easier application.

The fixation process of reactive dyes is crucial for color durability. In this process, the reactive dye forms a covalent bond with the terminal -OH or -NH2 groups in the fiber, which is controlled by maintaining an optimal pH with alkalis like caustic soda or soda ash. The following reaction occurs during the dyeing process:

D-SO2-CH2-CH2-OSO3Na + OH-Cell → D-SO2-CH2-CH2-O-Cell + NaHSO3

Color Staining Issues in Cotton Garments

During the garment washing process, various dyeing, washing, and softening agents (like polyethylene, polyvinyl acetate, and cationic dye fixers) can contribute to the migration of dye particles, especially in the presence of oxidative conditions. Such reactions can result in unexpected stains, often involving the interaction between the garment’s metal accessories (zippers, buttons) and the chemicals used.

Factors influencing the staining of garments:

• Dyestuff and chemical concentration
• Processing temperature
• Duration of garment dyeing treatment
• Stain resistance of the garment

Accessories such as metal zippers, buttons, and badges are particularly sensitive to oxidative reactions, leading to color changes or staining. Metals like zinc and alloy components are prone to reacting with dyestuffs, causing discoloration that can worsen if garments remain wet or are exposed to humid environments for extended periods.

Ozonolysis and Its Impact on Reactive Dyes

Ozonolysis is a critical process that can lead to color staining in reactive dye-treated garments. This reaction involves the oxidative cleavage of carbon-carbon bonds by ozone, resulting in products like aldehydes, ketones, or carboxylic acids. For azo dyes, ozonolysis may yield nitrosamines, leading to further color issues.

Preventive Care for Dyed Cotton Garments

To prevent color discharge and staining in cotton garments, follow these best practices:

1. Ensure thorough neutralization, rinsing, and drying after dyeing, washing, or softening processes to remove chemical residues.
2. Avoid drying garments in open air, where exposure to ozone can trigger reactions.
3. Handle metal accessories with care, ideally adding them during the final stages of garment treatment to prevent oxidation-related staining.
4. Control moisture, pH, and processing time to reduce oxidative cleavage of dyes.

Conclusion

Understanding the chemistry behind reactive dyes and the conditions that lead to color staining can help prevent issues with cotton garments. By optimizing garment processing and handling, manufacturers can minimize the risk of stains and ensure the durability of vibrant colors.

For more tips on garment care and dyeing solutions, contact us on ctd@atira.in 

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Significance of Cotton Testing:

Quality Consistency: Different end-use requirements, such as yarn strength and yarn and fabric appearance, require different fiber qualities. The ability of a fabric to hold dyes, as well as its performance in further finishing processes largely depend on fiber qualities.

For a given product requirements or spinning characteristics, a textile producer may not be able to obtain all the raw fiber qualities needed when buying a particular genetic as quality of a cotton variety not only varies from region to region but also varies tremendously from year to year. In such instances, quality measures become the basis for blends and mixes of various types of cotton to obtain specific properties of cotton with requisite quality measures. Efficient automated production processes with high processing speeds which are prevalent in the textiles industry also requires well-defined quality of input of raw materials.

Types of Cotton Testing:

1. Fiber Analysis:

Fibre analysis includes evaluation of following parameters:

• Staple length
• Length uniformity index
• Strength
• Micronaire
• Color and color grade
• HVI trash

Staple Length:

Staple length is reported as the average length of the longer half of the fibers (normally called “upper-half-mean” length), measured by clamping a fiber sample, then combing and brushing to make the fibers straight and parallel. Historically, the staple length was estimated manually, using the “hand stapling” process performed by a cotton classer. Today, thanks to technological advances, the staple length is now calculated from the length fibrogram sensed by the High-Volume Instrument (HVI). The fibrogram is an arrangement of fibers from the shortest to the longest in terms of span lengths (the distances fibers extend from a random catching point).

Staple Length is a critical property because the staple length of cotton affects yarn strength, evenness, and efficiency of the spinning process.

Extreme temperatures, water stress, insect pressure, nutrient deficiencies, and excessive cleaning or drying can all shorten the staple length of cotton.

Length uniformity index

The ratio between the “mean length” of fibers and the “upper-half-mean length” of fibers is referred to as the “length uniformity index.” Both the mean length and upper-half-mean length measurements are taken when the fiber beard described above is passed through the length sensor of the HVI system. There is a natural distribution in the length of cotton fibers but the lower the variation in this length distribution, the higher the length uniformity index.

Like staple length, length uniformity affects yarn strength and evenness. It also affects the efficiency of the spinning process. Cotton with a low length uniformity index has a high variance in fiber length which can make processing difficult and ultimately result in lower-quality yarn.

Interpretation of Length Uniformity

Strength:

Fiber strength, as measured on the HVI is the force in grams required to break a bundle of fibers in one tex unit in mass—a tex unit being the weight in grams of 1000 meters of fiber length. Strength measurements are conducted on the same beard of cotton used by the HVI to measure staple length and uniformity.

Fiber strength largely depend on genetics. Therefore, cotton variety plays an important role in fiber quality. Growth environment and crop management also play a huge role in determining fiber strength. It is key to understand exactly which combination of factors contributes to the highest quality crop and replicate that combination season after season.

Interpretation of Fibre strength

Micronaire:

The micronaire is a measurement of fiber fineness and maturity. It is determined by measuring the air permeability of a constant mass of cotton fibers compressed to a fixed volume. Fine or immature fibers that are easily compressed have a lower air permeability and therefore low micronaire. Coarse or mature fibers that resist compression have a high micronaire measurement.

Cotton fiber fineness affects processing performance and end-product quality in several ways. While micronaire is not a direct measurement of fiber fineness, it does provide some feedback on fineness. Micronaire is most influenced by the environmental conditions during the growing season. Various combinations of moisture, temperature, sunlight and length of season all contribute to the micronaire level.

So why is the micronaire measurement so important? Micronaire provides important information about the dyeing characteristics of the cotton products produced from the fiber. Uneven distribution of micronaire within a fabric can result in poor color uniformity of that fabric and problems such as barre or streaks. Micronaire uniformity makes it more valuable because it offers a greater product quality.

Color & Color Grade

Several factors impact the color of cotton fiber. Environmental variables that impact the color of cotton fiber include rainfall, freezes, insects, and microorganisms, as well as contact with the soil, grass, and the leafy portions of the cotton plant (on the field and during harvest) can all have an effect. While in storage after ginning, high levels of moisture and temperature can also impact the shade of the cotton fiber.

 The color of cotton is measured using a cotton colorimeter and is expressed by the degrees of reflectance (Rd). It typically ranges between 50-85 units and indicates how white or gray a sample is as well as yellowness (+b). The higher the Rd value, the whiter the cotton. In color measurement science, positive b (+b) values indicate intensity of yellow shades, so cotton with a higher +b measurement is more yellow. The most typical range of +b in upland cotton is from 6 to 12.

 There are 25 official color grades for American upland cotton (plus five categories of below grade color) and, traditionally, cotton classers determined the color grade of cotton by comparing a sample to physical color standards.

HVI Trash

Trash particles in cotton fiber come from parts of the cotton plant such as leaf and bark that are removed along with the fiber during harvesting. The HVI trash measurement is not part of the official USDA cotton classification but is provided as additional information.

When cotton fiber is tested using HVI instruments, the surface of the sample is scanned by a video camera. The percentage of the surface area occupied by trash particles is then determined by image processing software.

Conclusion:

In the textile industry, the quality of cotton fiber plays a critical role in determining the performance and aesthetics of the final product. Comprehensive cotton testing, encompassing staple length, length uniformity, fiber strength, micronaire, color grade, and HVI trash content, provides essential insights into the fiber’s properties. By understanding these parameters, manufacturers can optimize spinning processes, achieve consistent quality, and meet the high demands of consumers for superior textiles. As advancements in technology continue to enhance testing methods, the precision and reliability of cotton quality assessments will only improve, ensuring that the industry can adapt to evolving market needs while maintaining the highest standards of production.

ATIRA’s extensive infrastructure and experienced team ensure accurate, reliable results that help you achieve the highest quality in your textile products. Contact ATIRA today to learn more about our comprehensive cotton testing services.

The post A detailed guide to Cotton testing appeared first on ATIRA.

Molds/Tools are the cornerstone of any composite part manufacturing process. The quality of the final part is inherently tied to the quality of the tool used in its creation. Molds/tools precisely define part dimensions, surface finish, tolerances, shape, and overall appearance.

At Ahmedabad Textiles Industry’s Research Association (ATIRA), we are proud to offer specialized tool and part design services tailored to meet the needs of industries working with composite materials.

Our tool design process meticulously considers molding strategy, release strategy, and manufacturing process compatibility. This comprehensive approach ensures optimal performance and seamless integration with your production processes.

Our expertise spans across various composite manufacturing processes, including Vacuum Bagging, Hand Layup, Infusion, and Pultrusion. Additionally, we excel in thermal analysis to ensure optimal tool performance in varying temperature environments.

Our Services:

Composite Design
At ATIRA, we possess extensive experience in various composite component manufacturing techniques. Our expertise enables us to evaluate the pros and cons of each method and recommend the most suitable manufacturing solution for each specific project. Below are some of the common options we offer:

• Hand Lay-Up
• Resin Transfer Molding (RTM)
• Autoclave Molding
• Compression Molding
• Pultrusion

Our tailored approach ensures that we deliver optimal solutions tailored to your unique requirements.

Customized Tool Design: We excel in providing specialized mold design services tailored to the needs of composite part manufacturing. Our expertise ensures that your production processes are efficient, precise, and of the highest quality.

Composite Tooling: The manufacture of composite product and assemblies requires that some kind of accurate repeatable tool surface and be capable of withstanding repeated exposures to the cure cycle environment of high temperature and pressure. One of the most critical parameters in the design of tooling for composites is the difference between the coefficient of thermal expansion (CTE) of the tool being designed and of the composite product being fabricated.

Testing
Our expertise encompasses comprehensive composite testing, ranging from specimen manufacture to Mechanical, thermal, fire retardant, electrical and environmental testing. We ensure that every aspect of the composite material is rigorously evaluated to meet the highest standards of performance and durability.

By collaborating closely with our customers, we gain a comprehensive understanding of their needs, allowing us to assist with component design, material selection, and process definition to achieve optimal results. We provide valuable support in optimizing the design of both prototype and production tooling, ensuring superior quality and efficiency in manufacturing.

Contact : composites-research@atira.in

The post Transforming Composite Part Manufacturing: Tool/Mold Design services Offered by Ahmedabad Textiles Industry’s Research Association (ATIRA) appeared first on ATIRA.

According to a recent sanitation report by WHO (World Health Organization) released in October 2023, more than 1.5 billion individuals worldwide still lack access to basic sanitation services, including private toilets. Shockingly, 419 million people continue to practice open defecation, posing severe health risks. Inadequate sanitation is directly linked to the transmission of diseases such as cholera, dysentery, typhoid, intestinal worm infections, and polio. It also contributes to stunting and the alarming spread of antimicrobial resistance. Notably, diarrhoeal diseases remain a leading cause of death, especially among children under 5, despite being largely preventable. Enhancing water, sanitation, and hygiene measures can significantly reduce mortality rates in this vulnerable population. Let us now explore the broad benefits of enhanced sanitation beyond diarrhoea risk reduction

Boosting health and wellbeing: Key benefits of improved sanitation:

• Reducing the spread of intestinal worms, schistosomiasis and trachoma, which are neglected tropical diseases that cause suffering for millions

• Reducing the severity and impact of malnutrition

• Promoting dignity and boosting safety, particularly among women and girls;

• Promoting school attendance: girls’ school attendance is particularly boosted by the provision of separate sanitary facilities

• Reducing the spread of antimicrobial resistance

Redefining sanitation infrastructure with Textile Reinforced Concrete Modular Toilet

Introduction:

Textile Reinforced Concrete (TRC) is a versatile composite material composed of cement enriched with chemicals and reinforced with layers of textiles. Its unique composition allows for easy casting, requiring minimal machinery and labour. This makes TRC a cost-effective and efficient solution for various construction projects. The combination of rich cement and textile reinforcement ensures durability and structural integrity, making TRC suitable for a wide range of applications in the construction industry. The Cement absorbs the compressive load and the textile reinforcement absorbs the tensile and shear stresses. Unlike traditional concrete, TRC boasts low weight, corrosion-resistant reinforcement, and simplified formwork.

Setting up TRC based Toilets in rural areas can improve living conditions and align with government initiatives. These affordable and long-lasting toilets require minimal maintenance, with rapid 4-hour fabrication and modular components for easy installation, reducing setup time significantly.

Key Features of Textile Reinforced Concrete Modular Toilet:

• Installation Time: 4 hrs

• Based on Twin-pit pour-flush design

• Basic Structural Components: Textile Reinforced Concrete (TRC) and Pultruded Composite Frame

• UV resistant

• Fire resistant

• Maintenance free life-long use

Basic building components:

• Toilet Pan

• Water-seal

• Superstructure

• Interconnecting pipe work

• Leach pits

• Light Points

Size of the toilet:

• Width: 914 mm (2.99 ft)

• Breadth: 1219 mm (3.99 ft)

• Height: Front: 2215 mm (7.2 ft)/Back: 1963 mm (6.4 ft)

Installation of Textile Reinforced Concrete based Toilet in just 4 hours

Installation Steps:

Advantages of lightweight TRC panels

• Reduced density

• High compressive strength

• Improved thermal insulation properties

• Purely mineral, recyclable &Lightweight concrete

• Environment friendly, energy efficient technology

• The material has very low water absorbance capacity i.e. 10-15%

• Fire &Termite resistant

• High thermal insulation

• Low cost, light weight and prefabricated premium quality walls

For more information, please connect with us on composites-research@atira.in

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Eco Label Criteria: Key Pollutant Parameters for Textile Producers

The major pollutant parameters being considered for issuance of eco label to a textile producer are as follows:

Azo dyes containing Banned Amines and Toxic heavy metals

The excess heavy metal transfused through porosity of skin can lead to organ failure like lever, kidney & intestine, disordering nervous system with genetic disability. It can affect many metabolism functions that bring in poor health issues.

Toxic pesticides

Cotton cultivation is directly linked to the use of pesticides. The pesticides are harmful to human body and also severely affects soil fertility due to their non- biodegradable nature.

PCP -penta chloro phenol & Halogen carriers

PCP is stable to natural degradation. In humans its bio-accumulation takes place & posses severe health-hazards. Similarly chlorine bleaching and use of other organo halogens compounds as carriers are also regarded as unsafe due to their toxic nature

Free formaldehyde

Formaldehyde a pungent smelling chemical is a skin irritant and sensitizer and causes dermatitis and respiratory problems. Higher proportion of formaldehyde is nasal carcinogen.

Ph extract of the substrate

Ph extract is not within range and limits then human skin is susceptible towards highly acidic or alkaline condition. Irritation and allergies can be caused if pH is not within limits.

Color fastness

Leaching out of dyestuffs is non desirable due to its direct contact with human body. The banned amines start reacting with the skin and poses threat to the human health very rapidly.

Inducing poisonous dye particle through perspiration and rubbing against the skin can be controlled by very good fastness properties of the fabric.

Azo reduction can be accomplished by human intestinal micro flora, skin micro flora, environmental microorganisms, to a lesser extent by human liver azo-reductase, and by non-biological means.  Some azo dyes can be carcinogenic without being cleaved into aromatic

amines.  However, the carcinogenicity of many azo dyes is due to their cleaved product such

as benzidine.  Benzedrine induces various human and animal tumors.  Another azo dye component p-phenylenediamine (p-PDA) is a contact allergen.  Many azo dyes and their reductively cleaved products as well as chemically related aromatic amines are reported to affect human health, causing allergies and other human maladies.  

Azo compounds are chemically represented as R–N=N-R’, where –N=N- is the azo group, and the R or R’ can be either aryl or alkyl compounds. The International Union of Pure and Applied Chemistry (IUPAC) defines azo compounds as “derivative of diazene (diimide), HN=NH, wherein both hydrogens are substituted by hydrocarbyl group, e.g. PhN=NPh  azobenzene or diphenyldiazene”

Azo dyes are compounds consisting of a diazotized amine coupled to an amine or a phenol and contain one or more azo linkages. The essential precursors of azo dyes are aromatic amines.

Azo compounds have vivid colors and comprise about two-thirds of all synthetic dyes and are by far the most widely used and structurally diverse class of organic dyes in commerce.  Azo dyes are the largest and most versatile class of dyes and account for more than 50% of the dyes produced worldwide

Azo dyes are stable in light and resistant to microbial degradation or fading away due to washing. Therefore, azo dyes are not readily removed from waste water by conventional waste water treatment methods.  It has been estimated that about 10%-25% of the dyestuff in the dyeing process of textiles does not bind to fibers and are, therefore, released to the environment.

Mechanism of actions:-

Reductive cleavage:-

Azo dye Aromatic amine
R-N=N-R’ = R-NH₂ + NH₂-R’

1. Anaerobic condition (which can work without oxygen but use oxygen if it is present)
2. Reductive chemical medium
3. Enzymatic process (biological reducing agent intracellular as well as intestinal bacteria are responsible for reduction in body)

Factors affecting human health: –

The factors which affect human health may be intrinsic or extrinsic.

Intrinsic: – Malfunctioning of human immune system of the body, genetic disorder, and harmon imbalance are called intrinsic

Extrinsic: –Those infused from outside human body like disease causing microorganism & chemical/dye pollutant are called extrinsic. They affect the health by interfering with health functiong of the body.

Covalent bonding with DNA

The high electron density in the ring of aromatic amines makes electron removal very easy so they are easily oxidized and below 7 ph are converted into R-NH⁺, which form covalent bond with nucleic acid of DNA causing DNA damage. They induce mutation in DNA and living cells. These mutations may occur in germ cells and may results in altered structure or function of the cells & thus they interfere with the formation of normal cells in the body and form abnormal cells. Abnormal cells ultimately lead to formation of tumors or cancers. Since these amines are insoluble in water they may get accumulated in bladder and induce bladder cancer.

The following 20 aromatic amines are listed in the German Consumer Goods Ordinance. All are also listed in Group III of the MAK list under Category 1 or 2:

Aromatic amines

1. 2-naphthylamine
2. 4-aminodiphenyl
3. 4-chloro-o-toluidine
4. benzidine
5. 2,4,5-trimethylaniline
6. 2,4-diaminoanisol
7. 2,4-toluenediamine
8. 2-amino-4-nitrotoluene
9. 3,3’-dichlorobenzidine
10. 3,3’-dimethoxybenzidine [3,3’-dianisidine]
11. 3,3’-dimethyl-4,4’-diaminodiphenylmethane
12. 3,3’-dimethylbenzidine [o-tolidine]
13. 4,4’-diaminodiphenylmethane
14. 4,4’-methylene-bis-(2-chloroaniline)
15. 4,4’-oxydianiline
16. 4,4’-thiodianiline
17. O-aminoazotoluene
18. O-toluidine
19. p-chloroaniline
20. p-cresidine
21. O-anisidine  
22. p-aminoazobenzene.

Consumer goods according to section 5, No. 6 of the German Food and Consumer Goods Law, textile consumer goods are defined as “articles which have more than a passing contact with the human skin”. The Consumer Goods ordinance defines this more precisely

1. Garments; fabrics and yarn used to produce garments

2. Bedding; bed linen and blankets; pillows; sleeping bags

3. Towels; beach mats

4. Masks; hairpieces; artificial eyelashes

5. Jewelry worn against the skin; bracelets

6. Neck purses; rucksacks

7. Items on which babies and small children lie or sit

8. Diapers; sanitary towels; panty liners; tampons

(Source: Consumer Goods Ordinance 5^th amendment)

The Azo dye extract is analyzed for the 20 listed amines using one of the following methods: –

• Thin layer chromatography (TLC)
• High-performance liquid chromatography (HPLC)
• Gas capillary chromatography (GC)  
• Capillary electrophoresis (CE)

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In the world of traditional rotary and flatbed screen printing, achieving impeccable results requires meticulous attention to detail. The right viscosity of print paste, the choice of suitable thickeners, and careful manipulation of chemical reactions are all critical factors that contribute to the final outcome. In this article, we delve into the complexities of print paste composition and application, highlighting the significance of anionic thickeners, such as sodium alginate and guar gum, in the pursuit of color brilliance and design clarity.

The Role of Thickeners in Printing

Thickeners are the unsung heroes of the printing process, working silently to preserve the sharpness of design edges and outlines. By counteracting the substrate’s natural wicking effect, thickeners ensure that the print stays true to its intended form. Moreover, these compounds hold moisture, aiding the dissolution of dyes and chemicals that permeate the fibers during the steaming phase post-printing. This step is crucial for the completion of chemical reactions with the cellulose polymer. However, the choice of thickeners is not arbitrary; they must not react with dyes or other chemicals, as this could compromise the depth and wash-fastness of colors. Anionic thickeners, particularly sodium alginate, are preferred due to their biodegradability and compatibility with reactive dyes.

The Natural Chemistry of Thickeners

Natural-based thickeners, which are primarily polysaccharides, possess a high affinity for moisture absorption. This attribute stems from the numerous hydroxyl groups present in their chemical structure. However, this also presents a challenge, as these thickeners can react with reactive dyes, potentially interfering with the color development process. Sodium alginate, derived from brown seaweed, becomes the go-to choice due to its polyanionic nature, which repels anionic reactive dyes. This electrostatic repulsion prevents unwanted reactions and maintains the integrity of both the dye and the thickener.

Fine-Tuning Printing Solutions

The quality of printing solutions hinges on the specific properties of the thickeners used. Sodium alginate comes in various molecular weight grades, each offering distinct advantages. Low molecular weight grades yield high-solids-content solutions with Newtonian flow properties, while high molecular weight grades result in low-solids-content pastes with shear-thinning (pseudoplastic) flow properties. For fabric pre-treatment, higher quantities of thickener enhance edge and outline preservation during drying and steaming, thereby optimizing the final print quality.

Beyond Thickeners: Complementary Additives

In the pursuit of impeccable results, the role of additives cannot be ignored. Urea, a hygroscopic substance, serves as a dispersing agent and moisture provider during the covalent bonding reaction in the steaming process. Resist salt, on the other hand, functions as an anti-reducing agent, preventing undesirable reduction and decolorization of dyes during steaming. Additionally, sequestering agents prevent unwanted metal cation reactions with anionic dyes, further ensuring color stability and vibrancy.

The Digital Printing Evolution

The advent of digital printing has introduced new challenges and innovations. Ensuring proper dye substrate bond formation remains a fundamental principle, but the execution has evolved. Controlling penetration and wicking involves layering a controlled thin film of thickener to allow dye penetration without excessive wicking or reduction of dye. However, in digital printing, inkjet inks have notably lower viscosity compared to traditional printing pastes, necessitating advanced substrate pretreatment techniques to ensure ink coverage and quality.

Managing Interactions for Optimal Results

Interactions between ink and substrate are intricate and pivotal. Initial wetting and spreading of ink are influenced by surface tension and viscosity, ultimately determining dot gain. Subsequent processes, including wicking and diffusion, impact dot and line quality, inter-color bleeding, and mottle. In water-based ink systems, solvent loss through evaporation and absorption completes the process.

Taming Inter-Color Bleeding

Inter-color bleeding, the invasion of one color into an adjacent area, can be minimized through careful ink set selection and proper pretreatment. Precipitation of colorant caused by additives from one ink interacting with another can lead to bleeding. Selecting the right pretreatment and ink set can mitigate this issue. Furthermore, uneven density results from ink drops coalescing at the surface and low substrate porosity. Effective solutions involve pretreating the textile substrate with high ink-absorbing porous particles or polymers, preparing the fabric surface for optimal ink acceptance.

Conclusion

The world of printing is a dynamic amalgamation of science and artistry. From the meticulous choice of thickeners to the strategic use of additives and substrate treatments, every element plays a crucial role in achieving vibrant colors, sharp designs, and impeccable results. As technology evolves, so too do the methods, making print innovation a fascinating journey of adaptation and advancement.

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Introduction

Apart from the human race, animal & plants kingdoms too consume earth’s resources in sustaining and trying to keep their existence. The world population will grow additionally around 35% by 2050. The increasing population will need to cater with food and clothing. The economic upward move is believed to create an increase in the requirement of fabrics as a basic necessity. More consumption means more production, which means more utilization of input raw materials. Water is also an important raw material that is required as part of chemicals/dyes & auxiliaries plus additional processes used in textiles. The same discarded & used contaminated water as effluent need to be treated in environment friendly way to recycle to preserve the natural resources intact.

The textile sector utilizes huge amounts of electricity, fuel, and water with corresponding greenhouse gas emissions (GHGs). Textile manufacturing, especially wet processes, uses a large quantity of water and produces a significant volume of contaminated effluents. Saving water and minimizing water pollution has become a key strategy to move the textile industry toward more environmentally friendly processes.

Sustainability is usually divided into three categories:

1. Social,
2. Economic,
3. Environmental.

Compliance with all three categories is essential for the full implementation of sustainability.

Ozonation is a sustainable process that saves water and energy. At the same time, the ozonation process does not require chemicals or uses less chemicals at low temperatures does not produce waste, and reuses water.

Ozone is a tri-atomic form of oxygen (o3) with a remarkable oxidation capacity. ozone is produced through generators; the ozone generation system produces ozone onsite using oxygen from the PSA oxygen generator as the feed gas. This O₂ gas is subjected to a high voltage, an electric corona (similar to lightning) in the ozonator module, where the molecular oxygen breaks down to atomic oxygen.

Ozone must be produced in situ because it cannot be stored and transported and is very reactive. There are two basic methods for generating ozone artificially:

1. Corona discharge
2. Ultraviolet radiation

All ozone-generating methods depend on the applied energy. The bonds holding the oxygen atoms in a molecular form break with the energy, which allows them to dissociate and then reform as ozone.

Oxidative agents are used in de-sizing, bleaching, dyeing, clearing, surface modification, and wastewater treatments for applications in the textile sector. The main oxidative agent used in the textile sector is hydrogen peroxide.

The use of an activator, generally caustic soda, and high temperatures are required for hydrogen peroxide bleaching.

On the other hand, ozone is usually applied at room temperature because of its decreasing solubility at high temperatures, and ozone is active in the whole pH range compensating the requirement of pH adjustment chemicals.

Of course, the pH of the aqueous solution affects the reactions of ozone, but ozone is capable of giving oxidation reactions in neutral, acidic, or alkaline solutions. In the textile industry, ozone is utilized in various processes such as:

Ozone

Ozone, composed of three atoms of oxygen, can be utilized to oxidize many organic and inorganic impurities. It is an irritating pale blue gas, is reactive, is heavier than air, and cannot be stored or transported. For this reason, it has to be generated “in situ.” The German chemist C. F. Schönbein discovered ozone and named it so based on the Greek word “ozein” (to smell).

The first large-scale ozone application was for water purification. It is known that ozone is thermodynamically unstable and spontaneously reverts to oxygen; the structure of the ozone molecule.

Ozone is not a stable substance and breaks down into oxygen, with different half-lives basically depending on the temperature. Owing to its relatively short half-life, ozone should be generated onsite and it could not be stored like other chemicals

Ozone is highly competitive and is typically 1.2–1.5 times less costly than chlorine dioxide from an economic point of view. Ozone has a higher oxidation potential than many known chemicals.

Advantages of Ozone

• Ozone is a very strong oxidant and is used as an important disinfectant in the treatment of water and air.
• It does not leave any organic waste after water treatment.
• Ozonation can be carried out in any media and does not involve any other Chemicals.
• Ozone eliminates different inorganic, organic, and microbiological problems.

Denim Applications by Ozone

Denim finds its usage as a timeless, ageless, and sexless product in our life. The subsequent different washing types or finishing stages have constituted into a major industry itself. It is chiefly designed to bring a specific, unique, and aesthetic finish to the final garment.

In order to give the desired effect on the denim, a number of mechanical and chemical processes are applied to the fabrics. Bleaching denim with sodium hypochlorite causes a huge problem of AOX (adsorbable halogenated organic compounds).

Approximately 70 L of water is used for one denim. Stone washing methods are harmful to the environment and human health.

Ozone is capable of breaking down the dyestuffs, including indigo, into smaller and colorless fragments. This oxidizing capacity of ozone is utilized for fading denim garments to substitute the use of enzymes, pumice stones, or hypochlorite bleaching processes.

PET is not faded by ozone; however, ozone can be used to fade dyed cotton or other cellulosic yarns. Ozone is successfully used to recover the back staining of indigo garments.

Other oxidizing agents such as potassium permanganate and benzoyl peroxide are available for denim garment processing; however, the most important advantage of ozone is its ecofriendly nature, and it is a good alternative to other techniques.

Isatin and anthranilic acid may form during the oxidation of indigo and these products may cause yellowing. When the fading process is applied much more, it needs to be rinsed with water to remove yellowing.

Studies have shown that ultrasound and nano-bubble methods, which when combined with ozone, increase the effectiveness of ozone.

Ultrasonic cavitations improve the penetration of ozone into the fabric and then ozone decomposes indigo; therefore, ozone is much more effective when used along with ultrasonic energy.

One of the innovative processes that use ozone gas in the denim sector is nano-bubble technology. Ozone gas can be injected into the system instead of air to obtain nano-bubbles.

By means of nano-bubble, the efficiency of ozone gas in the liquid surplus will be increased and the washing effects desired to be shown to customers in a shorter, more efficient, and environmentally friendly way will be obtained.

One of the chief troubles in denim production is indigo back staining. Backstaining decreases the white–blue contrast and results in an evenly distributed bluish color all over the garment comprising local abraded areas, pockets, and labels.

Cotton Pretreatment, Dyeing, and Finishing by Ozone

Cotton is the most preferred fiber in the textile industry due to its being comfortable, healthy, and easily accessible. For this reason, all new technologies are generally applied to cotton products. But cotton needs pretreatment processes before dyeing and finishing process due to its natural structure (oils, wax, mote).

In particular, ozone can be used alone or in combination with other processes such as ultrasound, UV, and plasma. Ozonation can be used in textile companies for washing and treating denim fabrics, bleaching cotton fabrics, after-clearing of polyester, decolorization, and clearing wastewater. Recently, ozone technology has also been used for surface modifications in composite applications. There is no doubt that ozone will play a more important part in the near future both in the textile industry.

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Nanofibers:

Nanofibers have emerged as exciting one-dimensional (1D) nanomaterial’s for a wide range of research and commercial applications. The nanofibers can be made up of polymers that are natural, semi-synthetic and synthetic. The one nanometer is equal to 1×10^-9.

History of nanofiber production:

The first nanofibers were produced by electrospinning more than four centuries ago. The work by William Gilbert (in 1600) was considered as an early example of what would become the modern electrospinning technology. Gilbert’s study is the first record of the electrostatic attraction of a liquid. In 1845, Louis Schwabe invented a number of methods for spinning silk and creating artificial fibers.

In 1902, the American inventor John Francis Cooley patented the first electrospinning device: “Apparatus for electrically dispersing fluids”. In 1912, Burton and Wiegand analyzed the effect of electricity on streams of water drops, and in 1914 John Zeleny studied the behavior of fluid droplets at the end of metal capillaries.

Between 1931 and 1944, Anton Formhals was granted at least 22 patents on electrospinning, including the first one (in 1934) on the experimental production of fibers. In 1938, Rozenblum and Petryanov-Sokolov generated electrospun fibers that they used to produce filter materials, known as “Petryanov filters”.

In 1952, Radushkevich and Lukyanovich produced hollow graphitic carbon fibers, and Oberlin, Endo, and Koyama (1976) developed a chemical vapor deposition (CVD) process to fabricate nanoscale carbon fibers. Between 1964 and 1969, Geoffrey Ingram Taylor established the theoretical foundation of electrospinning.

In 1966, Harold L. Simons patented an instrument to produce fiber fabrics with various patterns. The physicist Lord Rayleigh published several articles (1978-1979) on the influence of electricity on colliding water drops and the equilibrium of liquid conducting masses charged with electricity.

In 1987, Charles Vernon Boys described the spinning process in an article on glass fiber manufacture The modern term ‘electrospinning’ was popularized by Doshi and Reneker (1995) who produced fibers with a variety of cross-sectional shapes from different polymers from 50 nm to 5 µm microns in size.  Since 1995, the number of publications on nanofibers has been increasing exponentially each year.

In 2001, Wang used electrospinning to fabricate inorganic fibers. In 2005, the first book on nanofibers (title: “An Introduction to Electrospinning and Nanofibers”) was published by Prof. Seeram Ramakrishna and co-author. In 2005, the Elmarco company developed NanospiderTM, the first technology in the world to enable the industrial scale production of nanofibers.  

Currently, more than 200 universities and research institutes worldwide study various aspects of nanofiber production and their characteristics. More and more articles are published on new nanofiber fabrication techniques, and this trend does not seem to decline.

Indeed, using the keywords nanofibers, nanofibres, nanofiber or nanofibre, the SciFinder database of chemical literature identified 23,728 articles up to October 2018. About 85% of these articles were published from 2006 to 2023 and still continues.  

Manufacturing techniques of nanofibers

There are a number of techniques capable of fabricating nanofibers. These techniques include component extrusion, phase separation, template synthesis, drawing, melt blowing, electrospinning and centrifugal spinning.

1. Bi-component extrusion (Island- in- the-sea)

Bicomponent fibers can be defined as extruding two polymers together in the same fiber from the same spinneret. Some examples of bi-component fibers include sheath-core, eccentric, islands-in-the-sea and Segmented pie fibers, as shown in Figure 1. Islands- in-the-sea form fibers are also called matrix-filament fibers because in cross section, they appear as one polymer is inserted into a matrix of a second polymer. Islands-in-the-sea fibers may have a uniform or non-uniform diameter of the island portion.

Essentially, these filaments are spun from the blend of two polymers in the required ratio; where one polymer is suspended as drops in the second’s melt. Fast cooling of the fiber beneath the spinneret holes is an important feature in fibers production. The differences in spinnability between the two polymers would almost hinder the spinnability of its blend, with the exception at lower mixtures concentration (#20%). One of the fiber components can be removed by the use of heat, a solvent or a chemical; or using mechanical devices.

In bi-component extrusion two polymers are delivered to a simple spinneret hole, split by a blade edge or septum, which feeds the two segments into side by side arrangements. The pipe in pipe method is one of most used methods to manufacture bi-component fibers where one of the streams constituent envelopes the other stream component at the end of the tube.

2. Phase Separation

In phase separation, a polymer is initially blended with a solvent before suffering gelation. The major mechanism in this system is the separation of phases owing to physical inconsistency. The solvent phase is then extracted, leaving the other residual phase. The phase separation method has involved main five steps, polymer dissolution, gelation, solvent extraction, freezing and freeze-drying.

3. Template Synthesis

Template synthesis is another commonly used approach mostly to produce inorganic nanofibers e.g. carbon nanotubes and nanofibers or conductive polymers like polyaniline (PANI), polypyrrole (PPy) etc.

Template synthesis involves the use of a template or mold to get a preferred material or structure. Thus the casting technique and DNA replication can be believed as template-based synthesis.

4. Drawing

The drawing process can be characterized as dry spinning at a molecular level. The process can only be applied to visco-elastic materials that can experience a high degree of deformations, but remaining sufficiently solid to hold up the developed stress during pulling.

A typical drawing method requires a SiO2 surface; a micro pipette and a micro manipulator to produce nanofibers. However, this process produced nanofibers in a laboratory-scale one by one which prevents it from being scaled up to industrial level.

A micropipette with a few micrometer diameters was dipped into the droplet near the contact line via a Micro manipulator. The micropipette was then removed from the liquor at a speed around 1 x 10^-4 ms^-1 to pull a nanofiber. The pulled fiber was dumped on the surface by touching it with the micropipette end.

The nanofiber drawing was frequently repeated on every droplet. The material viscosity at the edge of the droplet increased with evaporation. So, drawing a fiber involves a viscoelastic material which able to undergo strong deformations even as being adequate cohesive to maintain the developed stress during pulling.

5. Melt blown technology

Melt blown technology involves a single step production of fibers by a polymer melt extruding through an orifice die and drawing down the extrudate with a hot air, usually at similar temperature as the molten polymer. The air exerts the drag force to attenuate the melt extrudate into fibers, which are then gathered in the form of a nonwoven mat. This technique provides the utilization of thermoplastic polymers in a fairly economic spinning process as shown in below fig.

Melt blown technology

6. Electro spinning

Electro spinning is a famous procedure for the electrostatic production of polymer nanofibers. Formhals published the first patent for preparing artificial threads by electro spinning in 1934. Electro spinning is a smart method to attain nanofibers as it is simple to use and it produces non-woven mats with a wonderful volume/area ratio. The electro spinning techniques have two setup for generation of nanofibre. In the electro spinning technique, one is using needle based system and second needless.  A jet of polymer solution is ejected from the tip of a droplet under electrostatic forces action. The produced nanofibers usually form a nonwoven mat. Individual nanofibre fragment of lengths up to several centimeters can be arranged and collected. The polymer solutions were located in a plastic syringe tip of inner diameter 0.6 mm. A pendant droplet of polymer solution was continued at the syringe tip.

Schematic of Electro spinning Setup.

Electrospinning by needle-based system

Electrospinning by needless system

The jet issued downs from the tip of the pendant drop of polymer solution and was attracted to the sharp frame of a collector disk revolving around a horizontal axis. The frame is placed at a distance of 200 mm below the droplet. The aluminum disk of 200 mm diameter had a pointed frame with a 26.60 half-angle, to create a stronger converging electrostatic field. Therefore an electric potential variation around (15- 40) KV was formed between the liquid drop surface and the rotating disk collector.

7. Centrifugal spinning

Electro spinning is definitely the preferred method for nanofibers fabrication; nevertheless it faces some drawbacks for instance high electric field necessities, solutions with superior dielectric properties, low production rate, high production cost and many other safety correlated topics, electro spinning could not be suitable for mass production of certain materials.

Centrifugal spinning, or Force spinning, is a recently developed nanofiber forming method and it draws extensive interest mainly due to its high production rate, which is 500 times faster than traditional Electro spinning.

Rather than using electrostatic force, centrifugal spinning develops centrifugal force to realize the high-rate production of nanofibers . Centrifugal spinning can be used to fabricate nanofibers by using polymer solutions or polymer melts, without the dielectric constant restrictions and the involvement of high voltage electric field. Besides, carbon, ceramic and metal fibers can also be fabricated by centrifugal spinning.

 It is meaningful to note that the centrifugal spinning process was initially developed in 1924 by Hooper to produce artificial silk fiber from viscose by applying centrifugal forces to a viscous material. Therefore, this method has been used for fiber production since it was established by Hooper. The fiber formation process of centrifugal spinning relies upon the competition between centrifugal force and Laplace force (arise from surface curvature). During centrifugal spinning, the nanofiber formation process can be divided into three stages:

• Jet-initiation to force the polymer solution stream through the orifice,
• Jet-extension to enhance surface area of the forced polymer stream, and
• Solvent evaporation to harden and shrink the polymer jet.

Schematic drawing of Centrifugal spinning system

In the initial step, combinations of centrifugal and hydrostatic pressure at the capillary end exceed the Flow-resistant capillary forces and force the liquid polymer through the nozzle capillary as a jet.

The External radial centrifugal force stretches the polymer jet as it is anticipated toward the collector wall, but the jet moves in a warped curve owing to rotation-dependent inertia.

Stretching of the extruded polymer jet is significant in jet diameter reduction over the distance from the nozzle to the collector. At the same time, the solvent in the polymer solution evaporates, solidify and contract the jet. The solvent evaporation rate depends on its stability.

For highly volatile solvent the jets form thicker fiber as the fast evaporating potentiates fast solidification which hinders the jet extension.

With respect to centrifugal spinning, parameters that impact the spinning process and the structure of the resultant nanofibers include spinneret angular velocity, orifice radius, polymer viscoelasticity, solution surface tension, solvent evaporation rate, temperature and the nozzle-collector distance .

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Embracing Sustainability:

Jute, a natural fiber derived from the stems of the jute plant, offers several ecological benefits. It is a renewable resource with a low carbon footprint and requires minimal chemical treatment during processing. By utilizing jute fiber composites for prosthetic sockets, we can contribute to a more sustainable and eco-friendly approach to prosthetics.

Enhanced Comfort and Fit:

One of the key advantages of using jute fiber composites in prosthetic sockets is the enhanced comfort and fit they provide. Jute fibers possess excellent moisture-wicking properties, allowing for better breathability and reduced sweating. The natural flexibility and softness of jute fibers ensure a gentle and comfortable interface between the residual limb and the socket, minimizing the risk of skin irritation or pressure sores.

Customization and Adaptability:

Jute fiber composites offer remarkable adaptability, enabling customization according to individual needs. The inherent flexibility of jute fibers allows for precise shaping and contouring of the socket to match the unique anatomy of the residual limb. This personalized fit ensures optimal weight distribution and stability, resulting in improved balance and mobility for the user.

Manufacturing Considerations:

The manufacturing process for jute fiber composites involves impregnating the jute fibers with a polymer matrix followed by curing. This process can be performed using various techniques, including vacuum infusion or compression molding, depending on the desired properties and complexity of the socket design.

Strength and Durability:

Contrary to common misconceptions about natural fibers, jute fiber composites exhibit impressive strength and durability. When combined with appropriate resin systems, jute fibers provide sufficient structural integrity to withstand the stresses and strains encountered during daily activities. This ensures longevity and reliability in prosthetic sockets, reducing the need for frequent replacements.

Aesthetics and Design:

The socket material plays a crucial role in distributing the forces exerted during locomotion and absorbing impacts. Natural fiber composites, including jute fiber composites, exhibit excellent shock absorption properties, reducing the strain on the residual limb and providing a cushioning effect. This can enhance user comfort and minimize the risk of injuries or discomfort during activities.

Biocompatibility and Skin Health:

Natural fiber composites are known for their biocompatibility, which is crucial for socket materials. Jute fiber composites have a low tendency to cause skin irritation or allergies, making them suitable for individuals with sensitive skin. Additionally, the moisture-wicking properties of jute fibers help maintain a dry and breathable environment, reducing the risk of skin-related issues.

Comparison of Natural fiber composite-based socket over other synthetic and conventional socket materials

The utilization of jute fiber composites in the fabrication of prosthetic leg sockets represents a sustainable and innovative approach in the field of prosthetics. By embracing jute fibers’ inherent properties, such as comfort, customization, and durability, we can revolutionize the design and functionality of prosthetic sockets. The combination of eco-friendliness, enhanced comfort, and aesthetics makes jute fiber composites an exciting material for creating prosthetic leg sockets that cater to both the physical and emotional well-being of users. This remarkable innovation holds promise for a more sustainable and inclusive future in the field of prosthetics.

ATIRA (Ahmedabad Textile Industry’s Research Association) in collaboration with the Blind People’s Association (BPA) and supported by the National Jute Board, is at the forefront of developing natural fiber-based socket materials for prosthetic legs. This groundbreaking initiative aims to revolutionize the field of prosthetics by utilizing sustainable and biocompatible materials, specifically natural fibers like jute.

The partnership between ATIRA, BPA, and the National Jute Board signifies a collective effort towards creating innovative solutions that address the needs of individuals with limb loss. By combining their expertise in textile research, prosthetic design, and support for the physical impaired community, this collaboration holds tremendous potential for transforming the lives of amputees.

Furthermore, the partnership between ATIRA, BPA, and the National Jute Board emphasizes the importance of affordability and accessibility of prosthetics. Natural fibers, like jute, are cost-effective compared to synthetic materials, making prosthetic legs more affordable for a broader population. This inclusivity is critical in ensuring that individuals from all walks of life can benefit from advanced prosthetic technologies.

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