Class 7 Exam > Class 7 Questions > Discribe briefly,how wool is obtained from sh...
Start Learning for Free
Discribe briefly,how wool is obtained from sheep and processed to make woollen yarn?
Verified Answer
Discribe briefly,how wool is obtained from sheep and processed to make...
The wool comes from sheep. They grow a wool coat and once a year this wool coat is sheared off the animal. In Wisconsin, this is frequently done in the early spring shortly before they have their lambs. A shorn ewe will be more likely to stay out of the wind and bad weather and protect her new-born lamb if she does not have a thick wool coat on her.
2. Fleece
The shorn wool coat is called a fleece. It is also called "grease wool" because of all the oil and lanolin in the wool. This fleece must be cleaned before it can be processed into wool yarn. There is much vegetable matter, manure and natural oil that must be removed. Sometimes as much as 50% of the weight of the fleece is not wool.
3. Skirting a fleece
The wool from the back end of the sheep, their legs and sometimes their belly is too full of manure to use. These are referred to as "tags" These are removed first before washing the fleece; this process is called skirting, as all the edges of the wool coat are removed. The fleeces are also sorted into the various types: fine from coarse and short from long.
4. Washing the wool
The grease must then be removed from the wool. This can be done using soap or detergent and a lot of water or it can be done by submerging the wool in an acid bath which dissolves all the vegetable matter as well as the grease
5. Picking
The washed and dried wool is then "teased" or "picked" which is the beginning of the process of opening up the locks of wool and turning it into a consistent web. The wool is put through a picker which opens the locks and blows the fluffy wool into a room. At the same time a special spinning oil is added which helps the wool fibers slide against each other but also helps them stick together as a fine web through the processing.
6. Carding
The wool fibers are then put through a series of combing steps called carding. This can be done with small hand cards that look much like brushes you would use on a dog. It can also be done on a larger scale with machine driven drums covered with "card cloth" which combs the wool many times by transfering it back and forth from one drum to the other as it is passed down the series of drums. We have "woolen"cards which produce a wool web with the fibers coming off in random alignment. This is in contrast to "worsted" combing that lines up all the fibers
7. Roving
The final step in the carding process divides the web into small strips called pencil rovings. These are collected on large spools on the end of the card. These spools of pencil roving will be placed on the spinning frame to make yarn. Pencil roving is too delicate to be handled much, so when proccessing fiber for handspinners the roving is taken off the machines earlier and wound into b
The roving as it comes off the card has no twist. It is held together by the oil and natural hooks that exist on the surface of the wool fibers. The spinning frame will put the actual twist on the roving and turn it into yarn. This is collected on wooden bobbins. The frame we have is small but it can spin up to 90 threads at one time. This only spins one ply yarn which is not as sturdy as most prefer. In order to make two or more ply yarn the strands are twisted together on the plyer from several cones onto fewer spools.
This question is part of UPSC exam. View all Class 7 courses
|
|
Explore Courses for Class 7 exam
|
|
Top Courses for Class 7View all
Discribe briefly,how wool is obtained from sheep and processed to make woollen yarn?
Question Description
Discribe briefly,how wool is obtained from sheep and processed to make woollen yarn? for Class 7 2024 is part of Class 7 preparation. The Question and answers have been prepared according to the Class 7 exam syllabus. Information about Discribe briefly,how wool is obtained from sheep and processed to make woollen yarn? covers all topics & solutions for Class 7 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Discribe briefly,how wool is obtained from sheep and processed to make woollen yarn?.
Discribe briefly,how wool is obtained from sheep and processed to make woollen yarn? for Class 7 2024 is part of Class 7 preparation. The Question and answers have been prepared according to the Class 7 exam syllabus. Information about Discribe briefly,how wool is obtained from sheep and processed to make woollen yarn? covers all topics & solutions for Class 7 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Discribe briefly,how wool is obtained from sheep and processed to make woollen yarn?.
Solutions for Discribe briefly,how wool is obtained from sheep and processed to make woollen yarn? in English & in Hindi are available as part of our courses for Class 7.
Download more important topics, notes, lectures and mock test series for Class 7 Exam by signing up for free.
Here you can find the meaning of Discribe briefly,how wool is obtained from sheep and processed to make woollen yarn? defined & explained in the simplest way possible. Besides giving the explanation of
Discribe briefly,how wool is obtained from sheep and processed to make woollen yarn?, a detailed solution for Discribe briefly,how wool is obtained from sheep and processed to make woollen yarn? has been provided alongside types of Discribe briefly,how wool is obtained from sheep and processed to make woollen yarn? theory, EduRev gives you an
ample number of questions to practice Discribe briefly,how wool is obtained from sheep and processed to make woollen yarn? tests, examples and also practice Class 7 tests.
|
|
Explore Courses for Class 7 exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup