Knit Yarn Production System
In the present time, knit yarn occupied a big market, so every spinning mill has some tendency to produce knit yarn. So, to produce knit yarn, the following arrangements are necessary:
- Continuous electric supply source I.e. generator needed
- Working environment be comfortable I.e. humidity of plants is needed
- Quality control department should be well equipped.
- Schedule of machine maintenance must be maintained properly & carefully.
- Overall cleaning efficiency must be adequate.
- Relative humidity in different section given below:
Blow room 50-55% Carding 50-55% Drawframe, combing, fly-frame or simples frame 50 -55% Ring frame 50-60% Finishing 60-65%
Major Yarn Faults and Remedies
| Yarn faults | Remedies |
|---|---|
| Thick & thin places | Clean the sliver and yarn delivery passage |
| Slab | Undrafted sliver, to increase back zone draft, clean all covers of delivery passage. |
| Hairiness | To follow up ring traveler change schedule |
| Naps | Proper cleaning of Card frame |
| Color Contamination | During mixing, supervision must be strict. To set a contamination meter in conveyor lattice or finishing m/cs |
Uniformity Ratio
Uniformity Ratio is defined as the ratio of 50% of span length to 2.5 % span length expressed as a percentage. This ratio is a measure of the length
variability of the cotton. The ratings for uniformity ratio are as follows:
- 50% —> Good
- 45% —> Average
- 43% —> Poor
Micronnaire and Maturity
The ratings of the micronnaire and maturity values given below can be used as a guideline
| Micronnaire | Value | Maturity | Co-efficient |
|---|---|---|---|
| 3.0 | Fine | 0.80 | Good |
| 4.0 | Average | 0.75 | Average |
| 5.0 | Coarse | 0.65 | Poor |
Fiber Strength
The tenacity of the cotton obtained at 3mm gauge length can be rated on the following basis:
| Rating | Presley/1000 lb. sq. in) | Steloeter/(g/tex) |
|---|---|---|
| High | 75 | 30 |
| Average | 60 | 24 |
| Low | 45 | 18 |
