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Suggested Norms for Waste in Yarn Manufacturing

Suggested Norms for Waste in Yarn Manufacturing
Amit Kumar Das
Founder of "টেক্সটাইল ম্যানিয়া" Blog
Pabna Textile Engineering College, Pabna, Bangladesh
Cell: 01770 456240
Email: amitptec6th@gmail.com



In the yarn spinning department heads must alert all the staff members to locate exactly the sources and causes of origin of such waste and plan out ways and means (by installing waste containers, by proper house keeping, by modifying undesirable worker practices and by improving handling and transport methods) to keep the wastes under control. Suitable display boards in bold writing at different places may also be put up to draw attention of everyone constantly.
Wastes in yarn spinning
In the following table we will show norm for waste in different label of yarn processing.
Types of waste
Norms
Remarks
Blow room waste
1.25 times the trash in mixing
For a cleaning efficiency of 75 to 80 per cent,lint in waste should not exceed 33 to 40 per cent.
Card waste
4 to 5 per cent for foreign cotton and 5 to 6 per cent for Indian cottons
Flat speed 50mm.Use of continuous strippers,or metallic clothing results in 1 per cent to 1.5 percent reduction in waste.
Comber waste
10 to 12 percent
Depends on yarn strength,type of cotton  used method of lap preparation and fractioning efficiency of comber.
Hard waste in ring spinning ,reeling and winding
0.5 percent
Spoiled doffs soft. Bobbin s,bad bottoms etc. should be controlled.
Sweeping and clearer waste
1.5 percent
(1) Pick waste before sweeping instead of sorting afterwards (2) provide operatives with bags and discourage them throwing waste in floor.
Card web and lap
0.7 percent
An allowance of 12 cm. per lap and 8 metres  of sliver per card per strip.
Sliver in combers and lap former
1.0 percent
Stoppages of combers due to roller lapping and sliver breaks assumbed to be 2 per comber hour.
Drawing sliver
0.5 percent
Two passage breaks per 100 delivery hours assumed to be 8 in first head and 4 in finished head. 
Speedframe sliver and roving ends
1.0 percent
Two process. Breaks per 100 spindle hours assumed to be 4 in inter and 3 in roving. Creel only when at least one half of the bare bobbin in visible.
Ring frame , bondas and pnuemafil
2.5 percent
Depends on end breakage rate and work assignment and supervision.

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