International Journal of Engineering Inventions
Technical points in Carding Section
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- Điều hướng trang này:
- 4.2.3 Feed the material in the form of lap
- 4.2.4 Flock feeding
- 4.2.5 Importance Points for Quality of Yarn
| 4.2.2 Technical points in Carding Section
Feeding of material to the card is done in a two ways: Feed the material in the form of lap. Feed the material in the form of flock feed system. Flocks are transported with the help of air flow. 4.2.3 Feed the material in the form of lap Lap is the thick form of cotton sheet which is feed to the carding machine. The Linear density of the lap is very good and it is easier to maintain uniformity. Lap takes heavier load in taker-in as laps are heavily compressed. After the run out of lap feeding, when new lap is feed during this there is good fiber loss. In lap feeding auto- leveler are not required, hence investment and maintenance cost is less.[46] 4.2.4 Flock feeding High production is achieved by flock feeding system. In flock feeding auto-leveler is used which maintain the uniformity of sheet automatically. So investment cost and maintenance cost is more. In flock feeding high performance is achieved in carding due to high degree of openness of feeding cotton sheet. 4.2.5 Importance Points for Quality of Yarn Importance of quality in carding department depends upon following points: If wires are selected properly then 70% quality will be achieve in carding section. Cylinder speed depends upon micronaire value. If micronaire value is lower than 3.5 the cylinder speed should be around 350 rpm. If micronaire is between 3.5 to 4 it can be around 450 rpm. And if micronaire is more than 4 than it can be around 500 revolution per minute. Grinding of the flat tops should be done once in a three month for better yarn quality. Flat tops play a major role in reducing the neps. Licker-in and stationary flats wire should be changed after specific life mention by the company for achieving good yarn quality result. Auto leveler setting in the card should be proper. Nominal draft should be correct. Stopping time of the carding machine should be as minimum as possible. In the carding machine 10 meter C.V % of card sliver should be less than 2. Sliver weight difference between cards should not be more than 2.5 %. Analysis on the Defects in Yarn Manufacturing Process & its Prevention in Textile Industry www.ijeijournal.com Page | 55 Trash in sliver should be less than 0.1%. Uniformity ratio of sliver should be same or better than raw material cotton If the quality from a particular card is bad, immediate action to be taken to remove the problem. Lower the variation improves the yarn quality.[48] tải về 1.28 Mb. Chia sẻ với bạn bè của bạn:
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