Yarns

Question 1

What is the definition of a yarn?

Answer 1

A fine continuous length of fibres or filaments with or without twist

Question 2

Why do you twist yarns?

Answer 2

Make them stronger so they are suitable for weaving or knitting

Question 3

What letter is created when a yarn is spun clockwise?

Answer 3

Z - twist

Question 4

What letter is created when a yarn is spun anti-clockwise?

Answer 4

S - twist

Question 5

Spun fabrics have what yarn in the warp and weft?

Answer 5

Z twist goes in the warp

S twist goes in the weft

Question 6

Why do they have two different directions of yarns in fabric?

Answer 6

Light reflected in opposite directions and striped effects can be produced

Question 7

What is the twist level?

Answer 7

the number of twisters per metre, this can determine end use

Question 8

What are the properties of a low twist yarn and what are they more likely to be used for?

Answer 8

Softer, weaker, bulkier and likely to be used in weft yarns/ knitting

Question 9

What are the properties of a high twist yarn and what are they more likely to be used for?

Answer 9

Stronger, harder and they more likely to be used in weaving because they can withstand tension from the tension from the loom

Question 10

What are spun yarns?

Answer 10

Made by mechanical assembly
Spinning of staple of fibres
Fibres like: Cotton, linen, wool, silk

Question 11

What are filament yarns?

Answer 11

Continuous filaments of silk or synthetic fibres

Fibres like polyester or polyamide

Question 12

What are single yarns?

Answer 12

Continuous single thread of twisted staple or continuous filament fibres
One fibre of blended

Question 13

What are plied yarns?

Answer 13

Twisting two or more singles together to make a thicker and stronger yarn
This can be the same of type or different types to improve strength, weight or add special effects

Question 14

What is a core spun yarn?

Answer 14

Multi-component yarns and the core stays in the centre whilst other staple fibres are spun around to cover it in the single spinning process

Question 15

What is usually core spun?

Answer 15

Elastane covered by fibres like wool, cotton, silk, nylon or linen

Question 16

What are core spun yarns usually used from?

Answer 16

Knitted fabrics, trousers, sportswear, uniforms, dresses and underwear

Question 17

What are fancy yarns?

Answer 17

Produced in a special spinning process to give irregularities to texture the yarn e.g. Slub, loop, chenille or boucle yarns
Usually used in the weft

Question 18

What can fancy yarns provide?

Answer 18

Colour effects, matte effects, lustre effects