Yarn (Unit 2)

Question 1

What are Yarns?

Answer 1

The basic thread components of fabric construction (not non-wovens)

Question 2

What are yarns created from?

Answer 2

Yarns are created directly from fibres.

Question 3

what do yarns determine in fabric?

Answer 3

Yarns determine the texture and apperance of the yarn used to contruct it.

Question 4

Why are yarns important to fabric?

Answer 4

Yarns have a significant impact on it’s performance characteristics.

Question 5

How are the properties of yarns influenced?

Answer 5

1.by it’s structure
2. unique properties of the fibre wich it is made from.

Question 6

what are the three main types of yarns?

Answer 6

1. Staple spun
2. Monofilament yarn
3. mUltifilament yarn

Question 7

How are yarns constructed?

Answer 7

Yarns are usually constructed by twisting the fibre.

Question 8

what does twisting to to a fibre?

Answer 8

Twisting brings the fibres closer togther and give it strength.

Question 9

What are some properties of high twist yarns?

Answer 9

1. Lustre (shinier)
2. strong
3. good abraision resistance
4. smooth
5. resiliant

Question 10

What are some properties of low twist yarns?

Answer 10

1. Hairy and dull
2. poor abraison resistance
3. soft
4. hairy
5. good insulation

Question 11

what are the steps to create cotton yarn?

Answer 11

Blending and Cleaning
Carding
Formation of Sliver
Drawing Machine
Roving
Stretching and Finishing
Winding

Question 12

What are some properties of carded yarns?

Answer 12

1. bulky and fuzzy
2. low cost
3. coarser to touch
4. easily shrinks
5. medium to low twist
6. lighty weight fibres

Question 13

What are some properties of combed yarns?

Answer 13

2. straight and aligned
3. soft
4. smooth to touch
5. meduim to high twist
6. durable
7. lusterous

Question 14

What processes do long uniform fibres go under to be made into yarn?

Answer 14

Worsted proccessing

Question 15

What processes do short fibres go under to be made into yarn?

Answer 15

Woollen proccessing

Question 16

What are some characteristics of woollen yarn?

Answer 16

Bulky, eneaven, thick, hairy, textured, slackly twisted, weak and less-durable

Question 17

What are some characteristics of worsted yarn?

Answer 17

Finer, even, smooth, tightly twisted and more wrinkle resistant.

Question 18

What is Textured yarn from?

Answer 18

Synthetic filaments (thermoplastic)

Question 19

What is textured yarn?

Answer 19

Synthetic yarn that has been distorted to have loops, coils, curls or crimps to add or increase texture, bulkiness, softness or elasticity.

Question 20

What is the first step in making textured yarn?

Answer 20

1. The filament is distorted and the bond is broken.

Question 21

What is the second step in making textured yarn?

Answer 21

2. The yarn is heated wich breaks the bonds and allows the filaments to stay crimped.

Question 22

What is the third step in making textured yarn?

Answer 22

3. The yarn is cooled in the distorted shape and enables new bonds to form between polymers

Question 23

What are novelty yarns used for?

Answer 23

Decoration and increase the asthetic of the fabric.

Question 24

What are 2 ways decorative effects be acheived for novelty yarns?

Answer 24

1. altering the amount of twist
   or
   2.twisting yarns of different thickness together

Question 25

What can novelty yarns be made from?

Answer 25

Felting, braiding, knitting, heat setting, flat locking and spinning.

Question 26

What are the disadvantages of novelty yarns?

Answer 26

They are Expensive to produce do not improve durabilty and strength of the yarn.