Blending of Cotton Polyester Fiber to Produce PC / CVC Yarn

Blending of Cotton-Polyester Fibre to Produce PC/CVC Yarn
Iftay Khairul Alam
B. Sc in Textile Engineering
Ahsanullah University of Science & Technology

CVC Yarn: 
In a cotton polyester blended yarn, when the amount of cotton fiber is more than polyester fibre it is called CVC yarn. Here CVC stands for Chief Value of Cotton i.e., the ratio of cotton fibre is always above 50% or more.

Example: 30 s/1 Ne (60/40) CVC Yarn means, It is a 30 count single ply cotton-polyester blended yarn where the ratio of cotton fibre to polyester fibre is 60 to 40.

PC Yarn: 
A polyester cotton fibre blended yarn is called PC yarn, but in general where the amount of polyester fibre is more than cotton fibre is called PC yarn. Here PC stands for Polyester Cotton.

Example: 30 s/1 (60/40) Ne PC Yarn means, It is a 30 count single ply cotton-polyester blended yarn where the ratio of polyester fibre to cotton fibre is 60 to 40.

It can be said that every CVC yarn is also PC yarn but all the PC yarns are not CVC yarn.

The most popular reason for blending is that of combining the properties of two or more fibers. Blending of different fibers is also used to increase aesthetic effects in the fabric.
Polyester/cotton blend is an example; a good end use is in suiting. Polyester is a man-made fiber with high abrasion resistance and cotton is a natural fiber and has good moisture absorbency & feel.

Blending Process of Cotton-Polyester Fibre:
To produce a CVC/PC yarn the fibers must be blended before it reaches to ring frame machine as roving. This blending process mainly can be done in two manners.

1. Fibre Blending:
According to the blending ratio of cotton & polyester fibre in the yarn, numbers of cotton & polyester bales are given in the laydown in blowroom using bale management. Then the both fibres pass consecutively through the fibre plucker machine- mostly used - Uniflock (Rieter) or Blendomat (Trutzschler) machine and then gradually different cleaning machines. The homogenous blending of fibres takes place at mixing machine- mostly used as- Unimix (Rieter) or Multimixer (Trutzschler) machine. This type of mixing/blending is called fibre blending. From this type of blending, blended card slivers can be obtained. Then the regular spinning flow chart is followed till ring frame machine to produce PC/CVC blended yarn.
Polyester-cotton fibre blending in blowroom
Fig: Polyester-cotton fibre blending in blowroom
2. Sliver Blending:
In this process, cotton fibres & polyester fibres are processed through separate machines from blowroom to carding. Then the separate card slivers are made from polyester & cotton. After that, to ensure better blending, the polyester carded slivers are passed through one phase draw frame which is known as pre-pass phase to keep the sliver hank as optimum as possible. After that according to the required blended ratio the slivers are blended in breaker draw frame. In draw frame slivers are doubled, drafted & blended to the required ratio. After that, conventional spinning process is followed till ring frame machine to produce PC/CVC yarn.
Polycotton sliver blending in draw frame
Fig: Polycotton sliver blending in draw frame
After a lot of experiments, it has been noticed that sliver blending is slightly better than fibre blending. In sliver blending the ratio of cotton & polyester can be maintained more precisely than fibre blending.

You can also like:
  1. An Overview of Cotton Fiber
  2. Assignment on Polyester Fiber
  3. Basic Operations in the Blowroom
  4. Draw Frame | Actions Involved in Draw Frame
  5. An Overview of Ring Spinning Machine/Ring Frame
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Mazharul Islam Kiron is a textile consultant and researcher on online business promotion. He is working with one European textile machinery company as a country agent. He is also a contributor of Wikipedia.

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