Textiles - Fibres Overview

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Questions and Answers

Which of the following tests can be used to determine whether a fiber is cotton or linen?

  • Burn test
  • Color fastness test
  • Breaking test (correct)
  • Elasticity test

What characteristic feature is observed when performing the microscopic test on cotton fibers?

  • Overlapping scales with a rod-like inner layer
  • Thick wall with a narrow central canal
  • Double rod-like structure covered with lumps of gum
  • Hollow tube structure with a thin cell wall (correct)

Which of the following is a natural fiber derived from animal sources?

  • Silk (correct)
  • Nylon
  • Dacron
  • Polyester

Linen fibers are more effective than cotton fibers in which of the following properties?

<p>Water absorption (B)</p> Signup and view all the answers

What is a distinguishing feature of nylon fibers when observed under a microscope?

<p>Fine, round, smooth, and transparent appearance (D)</p> Signup and view all the answers

Which test would produce a sound difference indicating the type of fabric being torn?

<p>Tearing test (C)</p> Signup and view all the answers

What visual characteristic can be observed in wool fibers under high magnification?

<p>Double rod-like structure with overlapping scales (A)</p> Signup and view all the answers

Which of the following is an example of a man-made fiber derived from synthetic polymers?

<p>Acrylic (C)</p> Signup and view all the answers

What is the main purpose of applying a twist during the throwing process of silk?

<p>To hold the silk filaments together (B)</p> Signup and view all the answers

Which type of man-made fiber is derived from fossil fuels?

<p>Synthetic fibers (C)</p> Signup and view all the answers

Which of the following statements best describes organzine in silk processing?

<p>It requires high-quality raw silk for warp threads. (B)</p> Signup and view all the answers

What distinguishes artificial fibers from synthetic fibers?

<p>Artificial fibers are regenerated from natural cellulose. (B)</p> Signup and view all the answers

Which process is specifically mentioned as a preparation step for dyeing silk?

<p>De-gumming (A)</p> Signup and view all the answers

What is one of the chief components of animal fibers?

<p>Protein (A)</p> Signup and view all the answers

Which natural fiber is known for being very comfortable in summer due to its high absorbency?

<p>Cotton (A)</p> Signup and view all the answers

What test involves inspecting the fabric visually for appearance, texture, and feel?

<p>Visual inspection (B)</p> Signup and view all the answers

Which statement correctly describes the reaction of cellulose fibers to acidic substances?

<p>They are destroyed by concentrated mineral acid. (B)</p> Signup and view all the answers

What is a characteristic property of wool when exposed to alkalis?

<p>It loses 40% of its strength. (A)</p> Signup and view all the answers

Which synthetic fiber characteristic is stated in the content?

<p>They do not occur in fiber form until processed by man. (A)</p> Signup and view all the answers

What does a high absorbency in fibers typically lead to regarding their feel in summer?

<p>They feel cool against the skin. (B)</p> Signup and view all the answers

What is the purpose of labels on textile products?

<p>To help consumers identify fibers and care requirements. (D)</p> Signup and view all the answers

Which natural fiber is highlighted for its large cellulose content?

<p>Hemp (A)</p> Signup and view all the answers

What common issue may arise when identifying fibers through mere touch?

<p>It can be deceptive due to finishing and construction of the fabric. (C)</p> Signup and view all the answers

What is the primary characteristic used to differentiate between staple and filament fibers during a physical test?

<p>The length of the fiber (A)</p> Signup and view all the answers

Which burning test characteristic is associated with cotton fiber?

<p>Soft grey ash that crumbles easily (B)</p> Signup and view all the answers

Which of the following fibers is classified as a man-made fiber?

<p>Acetate (C)</p> Signup and view all the answers

What type of flame does nylon produce during a burning test?

<p>Melts and smells like plastic (C)</p> Signup and view all the answers

Which fiber burns readily and produces a wood-like smell during the burning test?

<p>Cellulose Acrylic (C)</p> Signup and view all the answers

Which statement best describes the burning characteristic of wool?

<p>It is difficult to burn and has a steady flame. (B)</p> Signup and view all the answers

What type of odor is produced when silk is burned?

<p>Burning hair (D)</p> Signup and view all the answers

Which fiber type is described as having a luxurious personality and can be woven or knitted?

<p>Cotton (D)</p> Signup and view all the answers

What is the main indication of a flickering flame during a burning test?

<p>Produced by man-made fibers (D)</p> Signup and view all the answers

What kind of ash residue is typically left behind by cotton after burning?

<p>Soft and easily crumbled (D)</p> Signup and view all the answers

Which of the following is a characteristic of staple fibers?

<p>They are short strands. (A)</p> Signup and view all the answers

What is a distinguishing factor between natural fibers and man-made fibers?

<p>Natural fibers originate from vegetable or animal sources. (D)</p> Signup and view all the answers

Which fiber is considered to have the highest water usage in its production?

<p>Cotton (C)</p> Signup and view all the answers

Which statement about recycling fibers is true?

<p>Certain nylon fibers can be chemically recycled to produce new fibers. (B)</p> Signup and view all the answers

What type of analysis is used to identify fibers based on their structural characteristics?

<p>Microscopic analysis (A)</p> Signup and view all the answers

What are natural fibers primarily composed of?

<p>Cellulose or protein (D)</p> Signup and view all the answers

What is the primary environmental concern regarding the production of manufactured fibers?

<p>Emissions output during production (C)</p> Signup and view all the answers

Which of the following is NOT considered a type of natural fiber?

<p>Polyester (D)</p> Signup and view all the answers

Which animal fiber has been traditionally recycled into new products for generations?

<p>Wool (D)</p> Signup and view all the answers

What is a benefit of using hemp compared to cotton in textile production?

<p>Higher yield and lower water consumption (B)</p> Signup and view all the answers

What property makes cellulose fibers sensitive to environmental factors?

<p>Absorbency (A)</p> Signup and view all the answers

Which test primarily relies on visual inspection to identify different fibers?

<p>Visual inspection and feel (C)</p> Signup and view all the answers

Which statement accurately describes the general characteristics of animal fibers?

<p>They can lose strength when exposed to alkalis. (A)</p> Signup and view all the answers

What is a common challenge in fiber identification due to human innovation?

<p>Confusion between synthetic and natural fibers (B)</p> Signup and view all the answers

What characteristic of wool affects its performance in cold, dry climates?

<p>High static electricity buildup (D)</p> Signup and view all the answers

What distinguishes luxury cotton from standard varieties?

<p>It possesses superior characteristics and quality. (C)</p> Signup and view all the answers

Which treatments are associated with luxury cotton to enhance its properties?

<p>Mercerization and combing processes. (C)</p> Signup and view all the answers

What is the main purpose of the ginning process in cotton production?

<p>To separate usable cotton from seed and debris. (B)</p> Signup and view all the answers

Which cotton variety is known as the highest grade of cotton fabric or yarn?

<p>Filo di Scozia® (D)</p> Signup and view all the answers

What is a significant characteristic of Cupro compared to silk and man-made linings?

<p>It is cooler to wear. (D)</p> Signup and view all the answers

What is the primary characteristic that differentiates staple fibers from filament fibers?

<p>Staple fibers consist of shorter strands, while filament fibers are continuous. (A)</p> Signup and view all the answers

Which fiber is noted for having a significantly lower water use during production compared to cotton?

<p>Linen (D)</p> Signup and view all the answers

What aspect of manufactured fibers typically consumes large amounts of energy during production?

<p>Chemical processing (B)</p> Signup and view all the answers

How are innovations in fiber recovery positioned within the design process?

<p>As essential for enhancing waste management (C)</p> Signup and view all the answers

In terms of social and environmental impact, which statement is true about the emissions generated from fiber production?

<p>Crop emissions from chemicals are unregulated, while manufactured fiber emissions are controlled. (C)</p> Signup and view all the answers

What identifies a fiber as a staple fiber during the physical test?

<p>The length of the fiber is relatively short (A)</p> Signup and view all the answers

What indicates the presence of a man-made fiber during the burning test?

<p>The fiber melts and produces a plastic-like odor (B)</p> Signup and view all the answers

Which fiber is known to leave behind a brittle ash when subjected to the burning test?

<p>Linen (A)</p> Signup and view all the answers

What is the characteristic odor produced when burning wool fibers?

<p>Burning hair (C)</p> Signup and view all the answers

During the burning test, which characteristic is NOT associated with polyester fibers?

<p>It leaves a soft, easily crumbling ash (D)</p> Signup and view all the answers

Flashcards

Cotton Fiber Structure

Cotton fibers appear as hollow tubes with thin cell walls under a microscope.

Linen Fiber Structure

Linen fibers have thick walls and a narrow central canal, with distinctive knobby markings.

Wool Fiber Structure

Wool fibers have two distinct layers under a microscope, with overlapping scales on the top layer, and a fluid-filled rod structure underneath.

Silk Fiber Structure

Silk fibers can either appear double rod-like with lumps of gum (raw silk) or smoother in cultivated silk, and they are broader than wool fibers and have an uneven width.

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Cotton Breaking Test

For cotton fibers, when wet and broken, the yarn ends are fluffy.

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Linen Breaking Test

For linen fibers, when wet and broken, the yarn ends are pointed.

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Moisture Test for Fibers

Linen absorbs more water than cotton.

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Strength comparison of fibers

Linen requires more force to tear than cotton.

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Synthetic Fibers

Man-made fibers also known as man-made fibers

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Cellulose Fibers

Plant fibers primarily composed of cellulose, a complex carbohydrate.

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Cellulose Characteristics

Cellulose is sensitive to acids and resistant to alkalis (at high temps, pressures).

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Animal Fibers

Fibers sourced from animals, mainly wool and silk.

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Wool and Silk Properties

Poor conductors of heat, can build static electricity; react differently to acids and alkalis.

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Fiber Identification

Methods for distinguishing types of fibers, including visual inspection, labels, and tests.

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Visual Inspection (Fibers)

Observing a fabric's appearance and feel to identify the fiber type.

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Fiber Labels

Fiber content and care instructions found on clothing labels.

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Luster (Fibers)

The shine or brightness of a fabric.

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Fiber Tests

Different techniques to identify fibers (visual and laboratory-based).

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Thrown Threads

Silk threads that have been twisted to achieve different properties and end uses.

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Tram Thread

A type of thrown silk thread created by loosely twisting two or more raw silk threads in one direction. Used for weft yarns.

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Organzine Thread

A thrown silk thread made by twisting raw silk in one direction, then twisting two or more of these threads together in the opposite direction. Used for warp yarns.

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Crêpe Thread

A thrown silk thread similar to organzine, but with a much tighter twist, resulting in a wrinkled or crinkled texture.

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Cotton Fiber Characteristics

Cotton fibers are versatile, practical, and can be used in various products, from budget-friendly items to designer fashion.

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Staple Fiber

A short fiber that can be unravelled from a fabric.

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Filament Fiber

A long fibrous material.

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Burning Test (Fiber Identification)

A method to identify natural, synthetic, or blended fabrics by observing burning characteristics.

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Cotton Burning Characteristic

Cotton burns steadily, leaves soft gray ash, has a burning leaves odour, and a hot flame that destroys the fabric.

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Linen Burning Characteristic

Linen takes time to ignite, leaves brittle ash, has a burning paper odour and a hot flame that extinguishes when blown.

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Silk Burning Characteristic

Silk burns quickly, leaves easily crumbling ash, has a burning hair odour, and is hard to extinguish.

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Wool Burning Characteristic

Wool is difficult to burn, leaves easily crumbling ash, has a burning hair odour and a steady flame.

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Acetate Burning Characteristic

Acetate leaves hard ash, has a burning hair odour, and has a flickering flame that can be extinguished.

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Physical Test (Fiber Identification)

Observing the length of fibers to determine whether fibers are staple or filament fibers. This is paired with visual inspection to assist in identifying fibers.

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Fibre

The basic building block of textiles; tiny, hair-like strands combined to create yarn and fabric.

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Fibre Supply Chain

The complex process of getting fibres to create fabrics, including resources for natural fibres and manufacturing.

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Cotton

A natural staple fibre, used globally but needing significant water.

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Water Usage in Textile Production

Some natural fibres, like cotton, use substantially more water than others.

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Natural Fibres

Fibres sourced from plants or animals.

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Mechanical Fibre Reuse

Transforming fabric waste into new yarn and fabric.

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Chemical Fibre Recycling

Converting some synthetic fibres into new, high-quality ones.

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Fibre Classification

Categorizing fibres as natural (plant or animal), or man-made.

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Social Impact of Cotton Production

Cotton farming uses vast amounts of water, affecting water resources, especially in drier regions.

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Environmental Impact of Synthetic Fibre Production

While synthetic fibres require less water, their manufacturing process consumes significant energy and emits pollutants.

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Fibre Recycling

Reusing and recycling fibres reduces waste and resource consumption. Some synthetic fibres can be chemically recycled into new high-quality fibres.

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What are man-made fibers?

Man-made fibers, also known as synthetic fibers, are created by humans through chemical processes. They are not found in nature in their fibrous form.

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What is cellulose?

Cellulose is a complex compound found in plants. It's like a building block for plant cell walls. It's made up of carbon, hydrogen, and oxygen.

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What is special about cellulose fibers?

Cellulose fibers, like cotton, are sensitive to acids but resistant to strong alkalis (like lye) under high temperature and pressure. This makes them useful for specific processes.

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How are animal fibers different?

Animal fibers like wool and silk are made of protein. They react differently to acids and alkalis, and are good insulators, making them comfortable to wear.

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What's the first step to identify fibers?

Visual inspection is crucial! Look at the fabric's appearance and touch it. Feel its texture, smoothness, and how cool or warm it feels.

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Burning Test

A method to identify the type of fiber (natural, man-made, or blend) by observing how it burns, the ash it produces, the smell, and the flame behavior.

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Physical Test

A simple test to determine if a fiber is a staple or filament by observing its length. It's often combined with visual inspection for better identification.

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Cotton Properties

Cotton is a versatile, practical natural fiber known for its softness, breathability, and absorbency. It's widely used in clothing and household textiles.

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What is carded cotton?

Cotton fibers brushed to prepare them for spinning. It results in a fabric with a 'raw' feel.

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What are the key features of combed cotton?

Cotton fibers that have been combed, ensuring a smoother finish and a more refined feel in the resulting fabric.

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What is 'Luxury Cotton'?

Cotton with superior characteristics compared to standard varieties. It features longer staple fibres, resulting in a smoother and finer fabric.

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What is Filo di Scozia®?

The highest grade of cotton fabric or yarn. It is long-staple, combed, two-ply cotton that has been double-mercerized, resulting in a luxurious, silky touch.

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What is Cotton Cupro?

A fabric made from organic cellulose fibers derived from cotton linters, offering a lightweight and cool alternative to silk and man-made linings.

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Study Notes

Textiles - Fibres

  • Fibres are the basic building blocks of textiles
  • Two main types: Staple (short strands like cotton) and Filament (continuous strands like silk).
  • Staple fibre quality depends on fineness and length.
  • Filament fibre quality is more about the intended use.
  • Fibre supply chains are complex, involving natural and manufactured materials.
  • Significant environmental concerns linked to water and energy usage in both natural and synthetic fibre production.
  • Mechanical reuse and chemical recycling of fibres.
  • Conservation of fibre supply is an important concern for designers.

Classification of Fibers

  • Fibers are categorized into natural (vegetable and animal) and man-made fibers.
  • Natural fibers are primarily cellulose or protein based.
  • Cellulose fiber examples include cotton hemp and linen.
  • Animal Fiber examples include wool and silk.
  • Man-made fibers are synthetic fibers.
  • Fiber identification methods include visual inspection, labels noting care instructions and tests conducted in a laboratory.

Textile Fibers (Diagram)

  • Natural fibers are divided into animal and plant fibers.
  • Man-made fibers are categorized into fibers derived from natural polymers and synthetic fibers.
  • Subcategories are listed for both natural and man-made fibres.

Special Identification Test

  • Physical test, burning test and microscopic test used to identify different types of fiber.
  • Burning tests are carried out carefully to identify natural or man-made fibers; identifying the colour of ash and flame characteristics.
  • Breaking or tearing tests can also be used to differentiate fibres.
  • Observations of microscopic structures provide additional identification.

Cotton Fiber

  • Cotton is a common and versatile natural fiber, popular for a wide range of uses, ranging from basic clothes to designer fashion.
  • Different grades and processing methods of cotton (carded or combed) impact its texture and smoothness.
  • 'Luxury' types of cottons exist with longer staples, such as Egyptian, Sea Island, Pima, and Supima.
  • Cotton lisle and Mercerized cotton are treated forms of yarn resulting in special qualities.

Linen Fiber

  • Linen is a natural plant fiber from flax plants; known for its durability and coolness.
  • Linen's handle is known for its distinctive texture.
  • Linen is used in both casual and formal, durable or luxurious clothing.
  • Linen tends to be superior to cotton in terms of fabric strength and absorbency.

Wool Fiber

  • Wool is a natural animal fiber known for its warmth and softness.
  • Wool fibers are characterized into different quality classes.
  • Wool class differences arise from processing techniques and fibre diameters.
  • Wool production involves shearing, classifying and a series of further processing.

Silk Fiber

  • Silk is a natural protein fiber with a characteristically smooth and lustrous texture.
  • The silk-producing moth (Bombyx mori) creates the fibre in cocoons.
  • Raw silk undergoes processing to produce smooth threads or yarns for use in making fabric.
  • Wild silks differ in appearances because of unique variations in moth species, climate conditions and so on.

Synthetics and Artificial Fibers

  • Man-made fibers are created from different materials, and have their exact properties derived from the need for a particular application.
  • Synthetics are derived from chemical compounds; artificially, from plant cellulosics.
  • These are often blended with natural fibers to benefit from their unique characteristics in quality, comfort and cost.

Weaves

  • Plain, twill, and sateen are common weaving techniques; each creating particular fabric appearances.
  • Plain weave is the simplest.
  • Twill weaves produce diagonal lines.
  • Sateen and satin weaves feature smooth surfaces.

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