Mixing is the first and important process in the spinning process. Mixing is a process by which different grade of same fiber are kept together.
Types of Mixing
- Volume mixing.
- Bin mixing.
- Card mixing.
- Weight mixing.
- Automatic mixing.
- Hand stock mixing.
- Lap mixing.
- Sliver mixing.
- Mixing by hopper.
Mixing in the Spinning Mill
Factors to be Considered Before Doing Mixing
Length of cotton
The length of the fibers should be equal otherwise various types of problem will create. Fibers having different length causes problem in drafting zone &also in simplex or ring frame.
Micronaire of cotton
The second considerable factor for mixing is the micronaire value of fiber, the higher, the micronaire value, the fibers are regarded coarser.
Color of cotton
Color is also a very important factor in mixing. In case of cotton, it is measured by brightness of cotton and the presence of yellow color in cotton.
Micronaire CV % of mixing bales
The micronaire CV % of mixing bales should be 5%.
The micronaire deviation of cotton fibers should be (+-0.1) or (+-0.05). Otherwise mixing quality cannot be classified as good quality.
Length deviation should not exceed 10% deviation from mixing to mixing for the same lot.
in mixing, two lot of adjacent color can be mixed, such as white and light spotted or light spotted and can be mixed. But white and spotted cannot be mixed.
Every cross section of the lay down plant should be same. Which means average micronaire value should be controlled in every cross section.
Engineer Sheikh Nurja
B.Sc engineer of textile
Merchandiser at buying house
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