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Yarn Manufacturing Viva Questions and Answers:

1. What is fiber?
Ans: Fiber or fibre is classes of materials that are continuous filaments or are in discrete elongated pieces, similar to lengths of thread. They are very important in the biology of both plants and animals, for holding tissues together.

2. What is textile fiber?
Ans: Textile fiber has some characteristics which differ between fiber to Textile fiber. Textile fiber can be spun into a yarn or made into a fabric by various methods including weaving, knitting, braiding, felting, and twisting. The essential requirements for fibers to be spun into yarn include a length of at least 5 millimeters, flexibility, cohesiveness, and sufficient strength. Other important properties include elasticity, fineness, uniformity, durability, and luster.

3. What is yarn?
Ans: Yarn is a long continuous length of interlocked fibers, suitable for use in the production of textiles, sewing, crocheting, knitting, weaving, embroidery, and rope making.

4. Flow chart of carded yarn manufacturing process.
Ans:
Fiber/Bale → Blow Room → Lap/Chute
↓
Lap/Chute → Carding → Sliver (Carded)
↓
Carded Sliver → Draw Frame → Sliver (Drawn)
↓
Drawn Sliver → Simplex → Rove
↓
Rove → Ring Frame → Yarn
↓
Winding
↓
Reeling
↓
Bundling
↓
Bailing

5. Flow chart of combed yarn manufacturing process.
Ans:
Fiber/Bale → Blow Room → Lap/Chute
↓
Lap/Chute → Carding → Sliver (Carded)
↓
Carded Sliver → Pre-Comb Drawing Frame → Sliver (Pre-Drawn)
↓
Sliver → Lap Frame → Lap
↓
Lap → Comber → Sliver
↓
Sliver → Post-Comb Drawing Frame → Sliver (Post-Drawn)
↓
Drawn Sliver → Simplex → Rove
↓
Rove → Ring Frame → Yarn
↓
Winding
↓
Reeling
↓
Bundling
↓
Bailing

6. What is the first process/ machine in yarn production?
Ans. Blow room.

7. What is the second process/ machine in yarn production?
Ans. Carding machine.

8. What process / machine is used after carding?
Ans. Draw frame.

9. What process is used after draw frame?
Ans. Simplex.

10. What process is used after simplex?
Ans. Ring frame.

11. What is the production of blow room?
Ans. Lap.

12. What is the production of carding machine?
Ans. Sliver.

13. What is the production of draw frame?
Ans. Sliver/Drawing sliver

14. What is the production of simplex?
Ans. Roving.

15. What is the production of ring frame?
Ans. Yarn.

16. 1 lb(pound) =?
Ans. 840 yds=1 Hank=0.4536 kg=453.6 gm=16 ounce(oz).

17. What is the input of blow room?
Ans. Bale.

18. What is the input of carding machine?
Ans. Lap/Now chute feed system is being used.

19. What is the input of combing?
Ans. Sliver lap and number of doubling is usually 20-24.

20. What is the input of simplex?
Ans. Drawn sliver, Sliver hank 0.12/0.14/0.16,etc.

21. What is the input of ring frame?
Ans. Roving/Roving hank may be 0.75/0.80,etc.

22. What is fiber fineness?
Ans. Fineness is one of the most important parameter determining the yarn quality (Fine or Coarse).

20. How fineness is specified for cotton?
Ans. Fineness is specified by micronaire value for cotton.

21. The maturity of cotton is defined in terms of the development of cell wall (Yes/no).
Ans. Yes.

22. A fully mature fibre has a well developed thick cell-wall (Yes/no).
Ans. Yes.

23. An immature fibre has a very thin cell-wall (Yes/no).
Ans. Yes.

24. In mature fibre, dye absorption is high (yes/no)
Ans. Yes

25. In immature fibre, dye absorption is low (yes/no).
Ans. Yes

26. What is staple length?
Ans. The average length of spinnable fibre is called staple length.

27. If staple length is increase then yarn quality is also increase (yes/no).
Ans. Yes

28. Toughness of fibre has a direct effect on yarn and fibre strength (yes/no).
Ans. Yes

29. If fibre strength is higher, then yarn and fabric strength is also higher (yes/ no).
Ans. Yes

30. Short fibres deteriorate the yarn strength and uniformity (true/false).
Ans. True.

31. What is the minimum strength for a textile fibre?
Ans. Approximately 6 CN/tex (about 6km breaking length)

32. What do you know about Presley index =?
Ans. Breaking load in Ibs/Bundle weight in mg.

33. What is fibre elongation?
Ans. Elongation is specified as a percentage of the starting length.

34. What is bale management?
Ans. Testing, sorting and mixing bales according to the properties of fibre for producing specific good quality yarn at minimum cost is called bale management.

35. When bale mixing is done?
Ans. Before the blow room/Before the bales going into blow room.

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