Fibres and Fabrics: Properties, Uses, and Environmental Impact

FIBRES AND FABRICS

Grade 10

NATURAL FIBRES

Natural fibres are materials produced by plants, animals, or geological processes that can be spun into filament, thread, or rope. These fibres can be woven, knitted, or felted to create fabrics and other materials. Natural fibres are valued for their sustainability, biodegradability, and various properties that make them suitable for various applications. Here's a detailed look at the properties of some common natural fibres:

GENERAL PROPERTIES OF NATURAL FIBRES

• Sustainability: Natural fibres are renewable resources, often requiring less energy to produce compared to synthetic fibres.
• Biodegradability: Most natural fibres decompose naturally, reducing environmental impact and waste.
• Comfort: Generally, more comfortable against the skin due to their breathability and moisture- wicking properties.
• Variety: Wide range of properties and applications, from clothing and textiles to industrial uses.

Natural fibres continue to be a popular choice due to their environmental benefits and the comfort they provide. The increasing demand for sustainable materials is likely to drive further innovation and application of natural fibres in various industries.

APPLICATIONS OF NATURAL FIBRES

• Textiles and Clothing: Used in the production of clothing, bed linens, and other fabric-based products.
• Home Furnishings: Utilised in making carpets, curtains, upholstery, and rugs.
• Industrial Uses: Employed in packaging, ropes, insulation, and geotextiles.
• Medical and Hygiene Products: Applied in making bandages, gauze, and hygiene products due to their absorbency and hypoallergenic properties.

COTTON

• Origin:
• Source: Gossypium plant
• Geographical Distribution: Widely grown in tropical and subtropical regions, particularly in the United States, China, India, and Egypt.
• Historical Significance: Cultivated for thousands of years, cotton played a crucial role in the industrial revolution and continues to be a major agricultural product.
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COTTON CONT.

DESIRABLE PROPERTIES OF COTTON

• Soft and Comfortable: Known for its softness and comfort against the skin.
• Breathable: Allows air to circulate, making it ideal for warm climates.
• Absorbent: It can absorb moisture, so it's often used for towels and bathrobes.
• Durable: Strong and can withstand repeated washing and use.
• Hypoallergenic: Generally, does not cause allergic reactions.
• Biodegradable: Eco-friendly and decomposes naturally over time.

UNDESIRABLE PROPERTIES OF COTTON

• Wrinkling: Cotton fabric wrinkles easily and requires frequent ironing.
• Shrinkage: Can shrink when washed and dried, particularly if not pre-shrunk.
• Mildew: Prone to mildew and mold growth if stored damp.
• Flammability: Highly flammable unless treated with flame retardants.
• Chemical Sensitivity: Susceptible to damage from strong acids and prolonged exposure to sunlight, which can weaken the fibres.

USES OF COTTON

• Clothing: Widely used in shirts, jeans, underwear, and other garments.
• Home Textiles: Used for bed linens, towels, curtains, and upholstery.
• Industrial Applications: Applied in the production of medical supplies like bandages and cotton swabs, and in paper and other products.
• Accessories: Used in making bags, shoes, and other accessories.

HEMP

• Origin:
• Source: Cannabis sativa plant
• Geographical Distribution: Grown globally, with significant cultivation in China, Canada, and parts of Europe.
• Historical Significance: One of the oldest known fibers, used for thousands of years for textiles, ropes, and as a source of nutrition and medicine.
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HEMP CONT.

DESIRABLE PROPERTIES OF HEMP

• Strong and Durable: High tensile strength makes it suitable for heavy-duty applications.
• Breathable: Good breathability, keeping fabrics cool and comfortable.
• Absorbent: Absorbs moisture well, making it useful in various textile applications.
• Antimicrobial: Naturally resistant to bacteria and mold.
• Biodegradable: Decomposes naturally and is environmentally friendly.
• Eco-Friendly Cultivation: Requires less water and pesticides compared to cotton.

UNDESIRABLE PROPERTIES OF HEMP

• Coarseness: Hemp fibres can be rough and coarse, which can make them less comfortable against the skin compared to cotton.
• Wrinkling: Like cotton, hemp fabrics tend to wrinkle easily.
• Colour Retention: May fade over time, particularly with prolonged exposure to sunlight.
• Stiffness: Can be stiff, though this can be mitigated with blending or special treatments.
• Limited Elasticity: Has lower elasticity compared to other natural fibers like wool, which can affect the fit and comfort of hemp garments.

USES OF HEMP

• Textiles and Clothing: Used in making clothing, especially in eco-friendly and sustainable fashion lines.
• Industrial Products: Utilised in making ropes, sails, canvas, and bio-composites.
• Construction Materials: Applied in producing hempcrete, an eco-friendly building material.
• Personal Care: Used in the production of eco-friendly diapers, wipes, and hygiene products.
• Food and Nutrition: Hemp seeds and oil are used in health foods and dietary supplements.

WOOL

• Origin:
• Source: Sheep (various breeds, including Merino, Cheviot, and others)
• Geographical Distribution: Major producers include Australia, New Zealand, China, and the United Kingdom.
• Historical Significance: Used since ancient times for clothing and insulation, wool has been a staple in textiles for centuries.
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WOOL CONT.

DESIRABLE PROPERTIES OF WOOL

• Warm and Insulating: Excellent thermal insulation properties.
• Elastic: Naturally elastic, retains shape well.
• Water-Repellent: Outer layer repels water while inner layers absorb moisture without feeling wet.
• Breathable: Allows moisture to escape, reducing clamminess.
• Fire-Resistant: Naturally flame-resistant.
• Durable: Strong and long-lasting with proper care.
• Biodegradable: Decomposes naturally, making it eco-friendly.

UNDESIRABLE PROPERTIES OF WOOL

• Itchiness: Can be itchy and irritating to sensitive skin, especially lower-grade wool.
• Shrinkage: Susceptible to felting and shrinkage when washed improperly (hot water, agitation).
• Moth Damage: Prone to damage from clothes moths if not stored properly.
• Allergen: Some people are allergic to lanolin, a natural oil found in wool.
• Cost: Generally, more expensive than other natural fibres due to the cost of raising sheep and processing wool.
• Heavy When Wet: Becomes heavy and takes a long time to dry when wet.
• Pilling: Can pill over time, especially in high-friction areas like elbows and knees.

USES OF WOOL

• Clothing: Commonly used in sweaters, suits, coats, and socks for its warmth and comfort.
• Home Textiles: Utilised in blankets, rugs, carpets, and upholstery.
• Industrial Applications: Applied in insulation materials and soundproofing products.
• Sports and Outdoor Gear: Used in high-performance gear like base layers, hats, and gloves for its warmth and moisture-wicking properties.
• Medical Textiles: Employed in wound dressings and other medical applications due to its natural properties.

REGENERATED CELLULOSE FIBRES

DEFINITION

Regenerated cellulose fibres are a type of man-made fibre created from natural cellulose sources through a series of chemical processes. These fibres are valued for their versatility, sustainability, and performance characteristics, making them widely used in textiles, medical applications, and other industries. Here is an in-depth explanation of regenerated cellulose fibres, including their production, types, properties, applications, and environmental impact.

1. Production Process

The production of regenerated cellulose fibres involves several key steps:

• a. Source Material The primary raw materials for regenerated cellulose fibres are natural cellulose sources, such as wood pulp, cotton linters, or bamboo. These sources are chosen for their high cellulose content.
• b. Cellulose Extraction The cellulose is extracted from these natural sources. For example, in the case of wood pulp, the wood is mechanically or chemically processed to separate cellulose fibres from lignin and other components.
• c. Dissolution The extracted cellulose is then dissolved in a chemical solvent to create a viscous solution. The specific solvent and process can vary based on the fibre produced. For instance, the viscose process uses a solution of cellulose xanthate in sodium hydroxide.
• d. Fiber Formation The cellulose solution is extruded through spinnerets (devices with fine holes) to form continuous filaments. As the filaments emerge from the spinnerets, they are solidified through various methods, such as coagulation in a chemical bath or air drying.
• e. Post-Treatment The formed fibres are washed, purified, and sometimes treated with additional chemicals to enhance their properties. This may include bleaching, dyeing, or coating with special finishes.

COTTON TEXTILES WOOD from sustainably managed forests COTTON TEXTILE SCRAPS HOME TEXTILES WOOD CHIPS Tencel® Feels so right X YARN AND FABRIC REFIBRA™ technology PULP PRODUCTION & COMBINE PULP TENCEL™ LYOCELL FIBERS WITH REFIBRA™ TECHNOLOGY AR ECONOMY

2. Types of Regenerated Cellulose Fibers

There are several types of regenerated cellulose fibres, each produced using slightly different processes and resulting in different properties:

• a. Viscose Rayon . Viscose rayon, often simply called rayon, is the most common type of regenerated cellulose fibre. It is made using the viscose process, where cellulose is treated with sodium hydroxide and carbon disulfide to form cellulose xanthate, which is then dissolved and extruded into fibres.
• b. Modal Modal is a type of rayon made from beech tree cellulose. It is known for its softness, high wet strength, and resistance to shrinkage. The production process is similar to viscose but involves additional steps to enhance fibre properties.
• c. Lyocell Lyocell, branded as Tencel, is produced using a more environmentally friendly solvent, N-methylmorpholine N-oxide (NMMO). This closed-loop process recycles almost all of the solvent, making lyocell production less harmful to the environment. Lyocell fibres are strong, absorbent, and biodegradable.
• d. Cupro Cupro, also known as cuprammonium rayon, is made by dissolving cellulose in a cuprammonium solution. The resulting fibres are fine, smooth, and have a silky texture.

Sugar palm fiber Pineapple fiber Hemp fiber Corn fiber Jute fiber Flax fiber Coir fiber Kenaf fiber EFB fiber