300+ TOP Yarn Manufacturing Interview Questions – Answers

1. What Is Fiber?

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?

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. Flow Chart Of Carded Yarn Manufacturing Process?

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

4. What Is Yarn?

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.

5. Flow Chart Of Combed Yarn Manufacturing Process?

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 Bale Management?

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

7. When Bale Mixing Is Done?

Before the blow room/Before the bales going into blow room.

8. What Are The Basic Operations In The Blow Room?

• Opening
• Cleaning
• Mixing & blending
• Even feed of material to the card.

9. What Is Carding?

Carding may be defined as the reduction of an entangled mass of fibre to a filmy web by working them between two closely spaced, relatively moving surface clothed with sharp wire points.

10. Objective Of Carding?

• To open up the cotton in to single fibre state.
• To reduce the number of neps, short fibres.
• To produce a thick untwisted rope of fibre called sliver.

11. What Are The Main Objectives Of Draw Frame?

• Straightening & parallelization of fibres by drafting & drawing.
• Minimization of irregularity by doubling.
• Blending & mixing of fibres.
• To produce a more uniform sliver of definite wt/yds.

12. What Are The Faults Of Blow Room?

• Soft lap,
• Conical lap,
• Barrel shaped,
• Split lap,
• Ragged selvedge,
• Lap licking.

13. Find Out The Hank Of The Lap When The Weight Of The Lap Is 14 Oz/yds?

14 oz contains = 1 yds, 

1 oz contains = 1/14 yds, 

16 oz or 1 lb contains = 16/14 yds 

=16/14×840 hank=0.00136 hank 

So hank of lap = 0.00136.

14. Find Out The Wt/yds Of The Lap When Hank Of The Lap Is 0.0014?

Weight of 0.0014×840 yds = 1 lbs or 16 oz 

1.176 yds = 16 oz 

1 yds = 16/ 1.176 oz = 13.6 oz 

So weight of lap = 13. 6 oz/yds 

15. What Is Roving?

A roving is a continuous slightly twisted strand of fibres which has not received its final drawing for yarn. Roving hank=0.70 to 0.85, TPI=about 1.15

16. What Are The Faults Of Yarn?

• Irregular yarn
• Thick & thin places
• Slubs
• Nepped yarn
• Spinners double
• Crackers
• Bad piecing
• Hairiness
• Soft yarn
• Hard & non elastic yarn
• Rough yarn

17. What Is Stress?

Stress is the ratio between the applied force and cross sectional area of the specimen,

Stress = applied force/ cross sectional area = F/A. 

Unit of stress is N/m2, dyne/cm2, which is also called Pascal (Pa).

18. What Is Tenacity?

The tenacity of a fibre is the mass stress at break. 

Unit – gm/tex, 

Tenacity = breaking load / mass stress or linear density, 

Linear density = mass/unit length.

19. What Is Tensile Strength?

Tensile strength = force required to break the specimen/ cross sectional area.

20. What Are The Basic Textile Materials?

Fiber 

↓ 

Yarn 

↓ 

Grey fabric 

↓ 

Finished fabric 

↓ 

End product

21. Write Down The Types Of Yarn Twist?

“z” or clock wise &

“S” or anti clock wise twist.

22. What Is Ipi?

It indicates yarns thick places, thin places and slubs.

23. What Is Count?

Count is a numerical expression which expresses /indicates coarseness or fineness of yarn.

Or,

count is a number indicating the mass per unit length or the length per unit mass of yarn.

24. Different Types Of Measurement?

1 yard = 0.9144 m 

1 m =1.0936 yards=7000 grain 

1kg = 2.204 lbs, 

1lbs(pound) = 453 .6gm = 7000 grains 

1gm =15.43 grains 

16 oz = 1 lb(pound) 

36 inch = 1 yard 

2.54 cm = 1 inch 

1 Hank=840 yards=1 pound

25. What Is Yarn Twist?

The spiral disposition of the components of thread which is usually the result of relative rotation of the two ends is called yarn twist.

26. Different Relations?

Denier = 9 × Tex

Ne × Denier = 5315

Tex × Ne = 590.6

Tex × Metric = 1000

Denier × Metric = 9000

27. What Are The Unusable Waste In Spinning Mill?

• dropping-II,
• flat strips of coarse count,
• Floor sweeping-II,
• dust etc.

28. How Can You Determine Yarn Count In English System?

Count (Ne) =length(yds)/length × weight unit/weight in gm 

= (120yds/840yds) × (1lbs or 453.6gm/weight in gm) 

=64.8/Weight in gm

29. Write Down The Name Of Count Of Direct System?

Txe,K tex,D tex,Mili tex,Denier,lb/spyndle, Woolen.

30. Write Down The Full Meaning Of Some Institution?

BSTI
= Bangladesh standard and testing institution.

ISO
= International organization for standardization.

BS
= British standard

AQL
= Acceptable quality level.

BCIRA
= British cotton industries research association.

ITET
= Institute of textile engineers and technologist.

AAMA
=American apparel manufacturer association.

AAQC
=American association of quality control.

31. Different Between Cotton And Viscose?

Cotton = Natural fiber, strength increase in wet condition. 

Viscose = Man made fiber, strength decrease in we condition.

32. What Is Bi-component Fiber?

Bi-component fibers are synthetic fibers which fibers filament contains two types of polymer.

33. What Is Lint And Linters?

Then cotton which are get after first time ginning to seeds cotton is called lint and for second time ginning of cotton is called linters.

34. What Is Blow Room?

The section or line where the compressed bale are converted into uniform lap of particular length or made suitable for carding by opening, blending or mixing.

35. How Fiber Is Form?

Elements

↓

Monomer/molecules/macromolecules

↓

Polymer chain

↓

Fibrils/micels

↓

Fiber

36. What Is Swelling?

The change in dimension due to absorbing water or moisture of any textile material is termed as swelling.

Swelling=(Swollen dimension-Dry dimension)/Dry dimension

37. What Is Ginning?

The procedure by which seeds and cottons are separated from seeds cotton is called Ginning.

38. What Is Staple Length?

The average length of spinable fiber is called staple length. 

** staple length = 0.91 × effective length(U.S.A upland cotton)

39. How The Amount Of Twist Is Expressed?

Twist per inch(TPI) = yarn

Twist per meter (TPM) = roving

Twist per centimeter (TPCM)

40. What Is Mass Stress?

Mass stress = Applied forse/linear density 

Unit = CN/tex , gm/tex

41. What Is The Modern Testing Equipment For Spinning Mill?

HVI(High volume instrument)

AFIS(Advance fiber information system)

Shirley analyzer = trash%

Moisture meter = MC%

Moisture testing oven = MR%

42. What Is The Maximum Count To Be Produce In Rotor M/c And Ring M/c In Spinning?

Rotor m/c = not possible to produce more than 40s count. 

Ring m/c = it is possible to produce about 300s count.

43. What Are The Action Of Blow Room?

• Action of opposing spikes
• Action of air current
• Action of beaters, 
• Regulating action

44. Total Draft =?

Total draft = BD×MD×FD

BD=Back draft

MD=Middle draft

FD=Front draft