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Saturday, April 17, 2010

Yarns

Plan of Work for Period Ending Day----Month------Year




Lesson: 10

Subject: Clothing and textile

Unit: Resources

Grade: 9

Topic: Yarns

Time: Two 90 minutes sessions

Objectives: At the end of the lesson student should be able to:

1. Tell the different types of yarns

2. Identify yarns according to their use and purpose

3. List the different methods of fabric construction

4. Using thread to create 3 different samples of yarns

5. Write 6 sentences of what they have learnt of yarns



Concepts: Fabric behaves differently depending on the types of yarns and type of weave used in its construction

Skills: Identifying different types of yarns

Focus Question:

Explain to your friend what is meant by staple yarns and filament yarns. Use thread to demonstrate how types of yarn are constructed

Teaching Method: Question and answer, brain storming, demonstration

Instructional Aid: cartridge paper, Home Economics in Action book 1

Reference: Text Resource and technology book 1,

Content Outline

1. Yarn are made from fibers twisted together by a process called spinning

2. Yarns vary in thickness dependent on the purpose for which it was created

3. The Thickness of a yarn is given in Tex. A unit of measurement especially used for silk and

manmade fibers.

4 Tex. is measured as the weight in grams of a given length of yarn, the

coarser the yarn

6. There are different types of yarns, they vary according to

a. the type of fiber from which they come,

b. the number of filament that makes up the yarn,

c the construction process

d. the number of yarn put together

e. the direction of the twist

f. the use to which the yarn is to be put.

Types of yarns and classification of yarns

a. Staple yarns- these are made from shorter fibers, having fuzzy ends that stick out. They can be made from natural fibers or manmade filament cut into short lengths.

b. Mono filament yarns-this is a single yarn that may have only one continuous strand of filament such as that used in ladies stockings this is the simplest

c. Ply yarns are made up of two or more yarns twisted together at the same time.

d. Multifilament yarns or corded yarns are ordinary yarns that are made up of several long continuous filament yarns



Grouping yarns

And the number of strands put together to make the yarn. The types of yarn above are

based on their length. There are also different types of yarns produce for different p

purpose such as

a. Weaving yarns -for weaving fabrics lengthwise (Warp) and crosswise (weft) direction the warp are smooth, regular, and strong having high or medium twist.

The weft is also smooth but not as strong they run across the warp filling up the spaces.

b. Knitting yarns- for hand knitting are soft twisted plied and cable yarns special textured and fancy yarns are made for machine knitting.

c. Sewing yarns (threads) are made to be strong smooth and slightly stretchy. They have high resistance to rubbing, heat light, shrinkage and chemicals

d. Cotton and synthetic fibers are often used to make sewing yarns.

Procedure:

-Teacher gives piece of fabric to students and let them draw out some yarn from length wise and cross wise. Students test them for strength and how easy it was to draw them out.

- Brain storming to find out what students know about topic. Students read focus question and under teachers guidance try to find answers in text while teacher guides them in finding information set out in content above.

-Students look at the samples of the different types of yarn in text and try to make samples of them using thread.

Students record finding and paste their samples on cartridge paper for display.

Evaluation

Students answer focus question using samples created in not more than six sentences

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