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Fiber

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6 Fibre to Fabric

6.1 Introduction
You all know that food, clothing and shelter are the three basic needs of life. You eat food to survive and protect yourself from diseases, you need a house to live in. Why do you wear clothes? You wear clothes for protection against climate, for modesty and beauty, and also to show status. The material that you use for clothing is called fabric. If you go to a shop to buy fabric for your dress, you would see a variety of fabrics there. Do you wonder what these fabrics are made of? How you get variety in fabrics? Why are some materials warm, some soft and others rough? Why do some materials go bad after washing while others remain the same? In this lesson you will find answers to these and other similar questions.

6.2 Objectives
After reading this lesson you will be able to do the following: describe and classify fibres; use the burning test to identify various fibres; state the characteristics of fibres; define a yarn; explain the methods of fabric formation.

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6.3 Fibres
Do you know what fabrics are made of? Take a cloth and pull out a thread. Untwist to loosen this thread. You will see that it is made up of smaller threads or hair like strands. Pull out one of these. This single hair like strand is called a fibre. A fibre is a hair like strand from which all fabrics are made. Classification of fibres Instead of a cloth, now pull fibres from a ball of cotton. What do you see? These fibres are very small. These are called staple fibres. Try and pull fibres from a fibres from a nylon fabric. These are long fibres. Such fibres are called filament fibres or simply filaments. Hence, you can classify fibres into two groups. See the following box. Short fibres Long fibres Staple fibre Filament fibre

Fibres can also be classifed on the basis of their origin. Natural Fibres: Some fibres are obtained from natural sources, that is, from plants and animals. Fibres from such sources are called natural fibres. Some examples of fibres from natural sources are cotton, Jute, silk, wool, etc. Man-made Fibres: The other type of fibres are obtained from chemical substance. These are called manmade fibres. They are rayon, polyester, nylon, acrylic (cashmilon) etc. Now can you say what is the second way to classify fibres? See the following box. Natural fibres Man made fibres Plants and animals Chemical substances

For your understanding we are putting the two classifications together in the figure given below:

Fibre to Fabric :: 85 FIBRE
On basis of length On basis of origin

Staple (short) e.g. Cotton, Jute, Wool,

Filament (long) e.g. Silk, Nylon, Rayon, Polyester

Natural Vegetables e.g. Cotton Jute e.g. Cotton, Jute, animals e.g. Wool Silk e.g. Wool, Silk

Man-made e.g. Rayon, Polyester Acrylic. Nylon, Polyester, Acrylic

1. (i)

Natural Fibres Vegetable Fibres

These fibres are obtained from different plants. Some are well known and useful to man. Cotton can you think of any such fibre? That is right, cotton, jute and coir. Cotton is obtained from seed of the plant, jute is obtained from the stem of a plant and coir is the outer covering of coconut. Fig. 6.1 (i) Animal Fibres These fibres are obtained from different animal sources. Can you name the fibre we get from sheep and goat? That’s right, we get wool from their hair. Wool can also be obtained from the hair of rabbits and camels. Another animal fibre you all are familiar with is silk. It is the secretion of an insect called the silk worm. 2. Man-made Fibres When you go to the market to buy fabrics, you must have heard from the shopkeeper that it is a synthetic material. Don’t get disturbed. Synthetic is another name for manmade fabrics. The first man-made fibre is known as rayon and was produced in the latter part of 19th century. Man-made fibres are generally filament fibres. Other examples are nylon, polyester, and acrylic.

INTEXT QUESTIONS 6.1
1. Complete the following chart by classifying fibres on the basis of origin and length. Fibre (a) (b) (c) (d) Origin (e)

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2.

Classify the following fibres as man-made and natural: (i) Nylon (ii) Wool (iii) Cotton (iv) Silk (v) Polyester (vi) Rayon (vii) Acrylic (viii) Jute State whether the following are true or false and correct the false statements: (i) (ii) (iii) (v) Fibre is the basic unit of all fabrics. Filament are short fibres. Jute is the outer covering of coconut. Polyester is a staple fibre.

3.

(iv) Silk is prepared from the stem of a plant.

6.4 Identification of Fibres
BURNING TEST This test helps to identify fibres. Once fibres are identified it will help the buyer to choose as per requirement, and not be cheated by salesmen. Procedure:- For the burning test:Take out a yarn from the fabric. Burn one end of the yarn either with a match stick or burning candle. Check the following. 1. How the fibre catches fire. 2. Type of flame. 3. Smell after burning. 4. Ash left behind. Answers to all these points will to help to identify the fibres.
FIBRE COTTON AND RAYON SILK AND WOOL NYLON, POLYSTER ACRYLIC INFLAME Catches fire easily Does not catch fire easily TYPE OF FLAME continues to burn with a bright yellow flame . Burns with a yellow flame. Does not continue to burn SMELL Smell of burning paper Smell of burning hair No definite smell ASH Light feathery ash Black crushable bead Hard, uncrushable bead

Does not catch fire Shrinks away from easily, melts flame. Burns with away sputtering

Fibre to Fabric :: 87

6.5 Yarns
Do you remember pulling a thread from a cloth and opening it? Yes, you found hair like fibres. That thread which was made of fibres is called yarn. Yarns are made up of a number of fibres twisted together. Fibres are thin and small and cannot be made into a fabric directly. So they are first converted into yarns which are longer, thicker and stronger. We use these yarns to make fabrics. A yarns is a continuous strand made up of a number of fibres which are twisted together. YARN MAKING The process of making yarns from fibres is called spinning. Here the fibres are not only twisted but also pulled out or drawn.

You can try spinning and making a yarn yourself. Take some cotton and start pulling out a few fibres. While pulling also twist. You will see that a yarn is formed. The spinning process helps to hold the fibres together and makes the yarns strong, smooth and fine. Even the filament fibres are twisted together to form a stronger, finer and smoother yarn. Spinning can be done by using a takli (spindle), a charkha or a spinning machine.

BLENDS You all must have heard of fabrics with names like terecot and cotswool. These are the names of mixed fabrics. Cotswool is a mixture of cotton and wool, and terewool of wool and terene. Blends are made from more than one kind of fibres. At the yarn stage itself, two types of fibres are mixed, pulled out and twisted together to form the yarn. Can you name some more mixed fabrics?

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INTEXT QUESTIONS 6.2
1. Write the missing steps in the process of yarn formation: Fibre ...........(i)...............(ii)...............(iii).................... Yarn. 2. State whether the following are true or false: (i) (ii) Yarn is made of a number of fibres. Staple fibres are used to make a yarn.

(iii) Spinning is a process of making fibres. (iv) Spinning increases the strength of yarns. (v) Twisting increases the strength of the yarns. (vi) Smoothness of a yarn depends on the twisting of the fibres. (vii) Blends are made from different fibres.

6.6 Fabrics
The term ‘fabric’ doesn’t need any explanation because you all know what it means. So we can describe it as: Fabric is the material that is used to make clothing or household articles. You all must have seen the seat of a chair or a charpoy made with nylon or cotton. These are made with tape - when two sets of tapes are interlaced with each other at right angles.Similarily a fabric is also made by interlacing two sets of yarns at right angles. This whole process of interlacing two sets of yarns at right angles to make a fabric is called weaving. Weaving is the process of interlacing two sets of yarns at right angles to each other to form a fabric. Weaving is done on looms. Hand operated looms are called handlooms and power operated ones are called power looms.

6.7 Weaving
Weaving is done by fitting one set of yarns on the loom which forms the length of the fabric. These are called the warps. The other set of yarns interlaced at right angles with the warps, are called wefts.

Fibre to Fabric :: 89

The yarns can be interlaced in many different ways. These different ways of in terlacing of yarns is called weaving. There are many types of weaves used to make different kinds of fabrics like cambric, popline, matt, satin, velvet, towels, denims, etc. Common weaves used for most of the fabrics are: (i) (ii) (iii) Plain weave Twill weave Satin weave

(iv) Plain Weave (i) Plain weave It is the most simple and inexpensive method of weaving. In this case, the warp and weft yarns alternate with each other, that is, each weft yarn goes over one warp yarn and under the next warp yarn, as is shown in the figure. Examine, the weave of fabrics like mulmul, cambric, organdy, silk, etc. These fabrics are made by the plain weave. (ii) Twill Weave

We can change the way of interlacing yarns so as to get many different designs. If we get a diagonal line effect on the fabric, then we call it the twill weave. Fabrics made by this weave are stronger as compared to plain weave. Fabrics like denims, Jeans meterial are made by the twill weave. (iii) Satin Weave Satin weave fabrics differ in appearance from twill weave fabrics because the diagonal line of twill weave is not visible. In the case of satin weave, there are long lengths of warp yarns between the wefts. As a result the warp yarns are seen more on the surface of the fabric. Reflection of light from these yarns give a shine to the fabric. Moreover, the yarns used for making this weave have lesser twist as compared to the yarns used for other weaves. All these together give the fabric a soft, smooth and shiny appearance. The other method of making a fabric is: KNITTING Pick up a sweater and any other woven fabric and compare the two? Yes, in case of a sweater, there is interlocking of loops. You must have seen your mother knitting sweat-

90 :: Home Science

ers with needles. If you try to do it yourself, you will see that every time you make new loops from previous ones the length increases. Knitting is also done on machines. Besides sweaters, you can make other garments also. For example, T Shirts. Examine a gents’ baniyan or vest. Can you tell how it is made? Knitting is interlooping of one or more set of yarns. When compared with wovens, knitted fabrics are more stretchable and can therefore be used for undergarments. They are also used for T-shirts, short pants for sports, socks, etc, because they allow freedom of movements along with a close fit. ACTIVITY Collect one sample each of plain weave fabric, twill weave fabric, satin weave fabric, and knitted fabric, and paste them in your record file. Note: these can be collected from tailors.

INTEXT QUESTIONS 6.3
Fill in the blanks with suitable words. 1. 2. 3. 4. 5. Fabrics are made by ...................... and ..................... . The three basic weaves are ................... Length wise yarns are known as .................... Widthwise yarns are known as ....................... ............................. fabrics are stretchable.

6.8 Characteristics of Fabrics
Now let us look at some of the properties of the various fibres which, if considered, prove a great help in the selection, use and maintenance of fabrics.

Fibre to Fabric :: 91

INTEXT QUESTIONS 6.4
1. Match the following statements: (a) (c) (e) 2. Polyester Wool Silk (i) Strongest fibre

(b) Nylon (d) Cotton

(ii) high moisture absorption (iii) Can not tolerate hot iron (iv) Longest natural fibre (v) Poor heat conduction

State whether the following statement are true or false: (i) (ii) (iii) Cottons have a smooth look. Wool sweaters conserve body heat. Silk shirts get dirty easily.

(iv) Nylon ropes are used by mountaineers. (v) 3. Polyester is good for making towels.

Choose the correct alternative to answer the following questions: (i) Which of the fabric is most suitable for summer? (a) (c) Cotton Silk (b) Nylon (d) Terelene. (ii) Which of the following fabrics does not take stains easily? (a) (c) Cotton Wool (b) Nylon (d) Silk (iii) Which of the following fabrics is a bad conductor? (a) Nylon (b) Wool

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(c)

Rayon

(d) Cotton (iv) Which fabric is made of staple fibre? (a) (c) Cotton Polyester (b) Nylon (d) Silk (v) Which is the strongest fibre? (a) (c) Cotton Rayon (b) Nylon (d) Wool (vi) Which fabric has a dull surface? (a) (c) Nylon Silk (b) Polyester

(d) Wool (vii) Cotton is most desirable fabric for making undergarments because it is : (a) Absorbant

(b) Dull (c) Shinning

(d) Strong

Fibre to Fabric :: 93

6.9 What You Have Learnt
In order to make it easy for you to remember, here are the main points of the lesson:
Length Properties Appearance Absorbency have FIBRES are classifed as Conductivity Strength

NATURAL Veg. e.g. cotton jute Animal e.g. wool. silk

MAN MADE e.g. polyester nylon

STAPLE e.g. cotton

FILAMENT e.g. rayon

used in the process of SPINNING to give YARN through consists of

Straighteening Drawing Twisting

Plain WEAVING Twill Satin

KNITTING Gives

FABRIC

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6.10Terminal Exercise
1. 2. 3. 4. 5. How will you classify fibres on the basis of their origin? What is the difference between rayon and nylon, though both are man-made fibres? How do you get yarn from a cotton ball? Explain the steps with help of a diagram. How will you make a fabric and how will you get different designs? Why do we all prefer cottons over nylons in summer?

6.11 Answers to Intext Questions
6.1 1. (a) Length (b) Staple (c) Filament (d) Natural (e) Man-made 2. Man-made: (i), Natural: (v), (ii), (vi), (iii), (vii) (iv), (viii)

3. (i) T (ii) F - Filaments are long fibres (iii) F - Jute is obtained from the stem of the jute plant (iv) F - from secretion of the silk worm (v) T 6.2 (i) Straightening (ii) Drawing 1. (i) T (ii) T 6.3 (iii) F (iv) F (iii) Twisting (v) T (vi) T (vii) T

1. Weaving, Knitting 2. Plain, twill, satin 3. Warp 4. Weft 5. Knitted

6.4

1. (a) (iii), 2. (i) F, 3. (i) (a), (vi)d

(b) (i), (ii) T, (ii) (d), (vii) (a)

(c) (v), (iii) F (iii)(b)

(d) (ii), (iv) T, (iv)(a)

(e) (iv) (v) F (v)(b)

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...look into the studies on fiber we find that fiber is important for gastrointestinal health as well as cholesterol-lowering benefits. Fiber is mainly used by your body to clean it out easier. It passes through your body unchanged and will push everything in front of it in the digestive system along, making the digestive process easier. Another function for fiber is to regulate how full you are. The amount of fiber you eat is what gives you the full feeling when you eat a lot. Some of the places you can find fiber is in oats, wheat and basically any food with any part of a plant in it. Fiber is a plant that cannot be broken down by the human digestive system. Intestinal bacteria are able to utilize fiber as nutrition, thus helping you to be well. Our digestive system is unable to break down dietary fiber and this indigestible ingredient has many effects on the functions of the body. Because fiber is not absorbed by the body, it does not significantly increase the energy content of food, and thus helps you to control your body weight. Soluble fiber is “soluble” in water. When mixed with water it forms and swells into a gel-like substance making the feces increase in weight. The dissolving of some fibers in water forms viscous solutions in the intestines; these are called viscous or soluble fibers. Soluble fiber has a lot of many benefits, including but not limited to, moderating blood glucose levels and lowering cholesterol. Some of the soluble fibers include pectins, gums, mucilages...

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Fiber Research

...Fiber Research Melanie L. Moran SCI/241 February 10, 2011 Fiber is a nutrient that is found in whole grains, such as wheat, rice, oats, and rye. Fiber is also found in fruits like apples, bananas, and oranges. It is found in some vegetables, such as carrots, peppers, rhubarb, and avocados. One can also get fiber from peas, beans, and legumes. Fiber helps to maintain proper bowel function, and it helps to prevent some cancers, for examples fiber helps to protect against breast cancer, and colon cancer. Fiber lowers cholesterol, stabilizes blood sugar, and helps to prevent obesity by making a person feel like they are full longer and as a result, eat less. There are two kinds of fibers; soluble and insoluble. Soluble fiber dissolves in water to form a gel – like substance that swells. Soluble fiber helps to keep blood glucose levels where they should be and lowers ones cholesterol. Examples of soluble fibers are oats, beans, peas, apples, and berries. The other type of fiber is insoluble fiber; this type of fiber does not dissolve. Insoluble fibers increase the movement of material through ones digestive tract. Examples of insoluble fiber are whole wheat breads, wheat cereals, cabbage, beets, carrots, Brussels sprouts, and apple skins. It is important that an adult who consumes a diet that consists of two thousand calories daily should eat six to eight servings of grains each day and a total of twenty five grams of fiber daily. It is recommended that children follow the...

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Fiber Optics

...History of Fiber Optics The idea of using light waves for communication can be traced as far back as 1880 when Alexander Graham Bell invented the “photo-phone” shortly after he invented the telephone in 1876. In this remarkable experiment, speech was transmitted by modulating a light beam, which traveled through air to the receiver. The flexible reflecting diaphragm (which could be activated by sound) was illuminated by sunlight. The reflected light was received by a parabolic reflector placed at a distance of about 200 m. The parabolic reflector concentrated the light on a photo-conducting selenium cell, which formed a part of a circuit with a battery and a receiving earphone. Sound waves present in the vicinity of the diaphragm vibrated the diaphragm, which led to a consequent variation of the light reflected by the diaphragm. The variation of the light falling on the selenium cell changed the electrical conductivity of the cell, which in turn changed the current in the electrical circuit. This changing current reproduced the sound on the earphone. Fiber Optic Technology Fiber Optic is a technology that uses glass as thin as a human hair to transmit data from one place to another by sending pulses of light through an optical fiber. The light forms an electromagnetic carrier wave that is modulated to carry information. A fiber optic cable consists of a bundle of glass threads, each of which is capable of transmitting messages modulated onto light waves. It is widely...

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Fiber Research

...Week 3 CheckPoint Fiber Research Week 3 CheckPoint Fiber Research Phoenix University SCI 241 The role that fiber plays in a human body, is that it’s the main function in the body is to regulate a person’s digestion. Some examples of food sources for fiber can be found in bread, pasta, flax and seed. Researches have also found out that most yogurts now have a fiber additive, so most yogurts can be added to good food sources for fiber. The difference between soluble and insoluble fiber is that soluble fiber is soluble in water, while insoluble fiber does not absorb or even dissolve in water. When you mix soluble fiber with water, the water and fiber turns into gel. The benefit of soluble fiber includes lowering a person’s cholesterol as well as moderating a person’s glucose levels. You can find soluble fiber in oats, oatmeal, peas, beans, lentils, barley, fruits and vegetables. Insoluble fiber passes through the body’s digestive system. The benefits that insoluble offers include intestinal health of a reduction in the risk of occurrence of colorectal cancer, hemorrhoids, and constipation. Insoluble primarily come from bran layers of cereal grains. The fiber recommendations for adults are 20-35 grams per day for adults, or 10-13 grams for every 1,000 calories in one’s diet. The fiber recommendation for children really depends on their age. Kids ages 4-18 need to have an intake of 25-38 grams per day. For adults it’s recommended that the amount of an adult should come...

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