Working Principle of Carding Machine | Action in Carding Machine

Carding Process:
A process in the manufacture of spun yarns whereby the staple is opened, cleaned, aligned, and formed into a continuous, untwisted strand called carding process.
Carding Machine
Objects of Carding Machine
  1. Opening to individual fibers.
  2. Elimination of impurities.
  3. Elimination of dust.
  4. Disentangling of naps.
  5. Elimination of short fibers.
  6. Fiber blending.
  7. Fiber orientation.
  8. Sliver formation.
Machine Parts of Carding Machine :
  1. Ducting pipe.
  2. Chute feed.
  3. Feed roller.
  4. Transport roller.
  5. Brush roller.
  6. Flat.
  7. Fixed carding bars.
  8. Taker in.
  9. Grid bar.
  10. Suction duct.
  11. Main cylinder.
  12. Doffer.
  13. Stripping device.
  14. Calendaring roller
  15. Coiler.
  16. Can.
Action in Carding Machine :
The following actions take place in a carding machine.
  1. Combing action.
  2. Carding action.
  3. Stripping action.
  4. Doffing action.
i. Combing action :
Combing action takes place feed roller & taken in. Here the pin directions of two surfaces are the same. Combing is the straightening & paralleling of fibers & the removal of short fibers & impurities by using a comb or combs which is assisted by roller & brushed.

ii. Carding action :
Carding action takes place between flat & cylinder.

In carding action,
  • Directions of wire in two surfaces are opposite.
  • The moving directions of roller are also opposite.
  • One roller is slower & other is faster.
So carding action is known as “Point against point” action.

iii. Stripping action :
Stripping action takes place between,

a) Taker in and Cylinder &
b) Doffer and stripper.

In stripping action,
  • Wire direction will be the same.
  • Roller moving direction will be the same.
  • One roller will be faster than another.
So stripping action is known as “Point back point” action.

iv. Doffing action :
This action takes place between cylinder & doffer. In this place fiber is transferred from cylinder to differ. Low speed doffer is called fiber form of high speed cylinder & makes a condensed web for formation of sliver.

Working principle of Carding Machine :
  • Supplying raw material by ducting pipe.
  • Chute feed evenly compress a bat of 500-900 kfex.
  • Transport roller forwards the material to feed plate.
  • Feed arrangement consists of feed roller & feed plate.
  • Taker in opens the material to small flocks. When the material passes to main cylinder, mote knives, grid bars & carding segments eliminate a great part of impurities.
  • Grid equipment.
  • Suction dust to carry away the waste.
  • Main cylinder & fixed carding segments designed to assist the carding operation.
  • The main carding operation occurs between flats & cylinder. Flats compromise 80 to 116individual carding bars combined into a band moving on an endless path. 30 to 46 flats are always in action.
  • Cleaning unit cleans stripes fiber, naps & foreign matters from flats.
  • Grid or cover plate.
  • The doffer combines the fiber into a web. Because of it’s substantially lower speed relative to the cylinder.
  • Stripping device & doffing master draw the web from the doffers.
  • Calendar roller calendars the cotton & moves that toward.
  • At last by can & coiler the fabric is produced.
Conclusion :
Carding is the process of arranging the fiber in parallel fusion. This is necessary for all staple fiber. Otherwise it would be impossible to produce fine yarn. Before the raw stock can be made into yarn, the remaining impurities must be removed. The fiber mustbe in different angle & they must be straight turned. The card is the hard of the spinning mill & well carded is half spun. Demonstrated the immersed significance of carding for the final of opening operation.


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