Question

Why cotton woolis used to make wicks and not synthetic fibres?

Answer 1

 

Fiber and Fabric

 

 

Fiber and Fabri

TABLE OF CONTENT

3.1 VARIETY IN FABRICS

3.2 FIBRE

3.3 SOME PLANT FIBRES

3.4 SPINNING COTTON YARN

3.5 YARN TO FABRIC

3.6 HISTORY OF CLOTHING MATERIAL

KEYWORDS

SUMMARY

EXERCISE

SUGGESTED PROJECTS AND ACTIVITIES

Paheli and Boojho won the first prize in a Science Quiz competition held at their school. They were very excited and decided to use the prize money to buy clothes for their parents. When they saw a large variety of cloth material, they got confused (Fig. 3.1). The shopkeeper explained that some clothes or fabrics were cotton and some were synthetic.

He also had woollen mufflers and shawls. There were many silk sarees as well. Paheli and Boojho felt very excited. They touched and felt these different fabrics. Finally, they bought a woolen muffler and a cotton saree.

After their visit to the cloth shop, Paheli and Boojho began to notice various fabrics in their surroundings. They found that bed sheets, blankets,

curtains, tablecloths, towels and dusters were made from different kinds of fabrics. Even their school bags and the gunny bags were made from some kind of fabric. They tried to identify these fabrics as cotton, wool, silk or synthetic. Can you also identify some fabrics?

3.1 VARIETY IN FABRICS

Activity 1

Visit a nearby tailoring shop. Collect cuttings of fabrics leftover after stitching. Feel and touch each piece of fabric. Now, try to label some of the fabrics as cotton, silk, wool or synthetic after asking for help from the tailor. Do you wonder what these different fabrics are made of? When you look at any fabric, it seems a continuous piece. Now, look at it closely. What do you notice

Activity 2

Select a piece of cotton fabric you labelled in Activity 1. Now, try to find a loose thread or yarn at one of the edges and pull it out

yarns are visible, you can gently pull one out with a pin or a needle.

We find that a fabric is made up of yarns arranged together. What are these yarns made of?

3.2 FIBRE

Activity 2

Take out a yarn from a piece of cotton fabric. Place this piece of yarn on the table. Now, press one end of the yarn with your thumb. Scratch the other end of the yarn along its length with your nail as shown in Fig. 3.4. Do you find that at this end, the yarn splits up into thin strands

Answer 2

synthetic fibres are combustible but also dangerous. Harmful gases are released and it also burns out faster