Spinning process design and calculation – thinking questions
This chapter has been finished, please think about the following questions! 1. What principles should be followed when selecting raw cotton? 2. How to choose raw cotton? 3. How to rationally use low-grade cotton and backsplash? 4. How to choose the length and fineness of chemical fiber? 5. What principles should be followed when selecting the spinning process? 6. What are the requirements for each single machine combination in the blowroom process? 7. What are the advantages of blowing and carding combination? 8. Write down the cotton blowroom process for spinning cotton, cotton-type chemical fiber, medium-length chemical fiber and rotor spinning. 9. How many combing preparation processes are there? What are the characteristics of each? 10. Briefly describe the finishing characteristics of tube doubling, tube doubling, twist combination, direct weft yarn and indirect weft yarn. 11. Write down the spinning process flow of carded cotton, combed cotton, combed polyester/cotton, and rotor spinning 12. Write down the process flow of strand sorting. 13. What principles should be followed when selecting equipment? 14. Outline the performance characteristics of each spinning equipment. 15． What are the characteristics of the new domestic roving frame? 16. What factors should be considered when selecting process parameters and equipment configuration? 17. How to choose the linear density, combination number and drafting ratio of semi-finished products? 18. How to convert semi-finished product linear density, combination number and draft multiple? 19. It is known that the dry weight mixing ratio of polyester pre-drawn A and combed sliver B is polyester/cotton 55/45, there are 4 polyester slivers and 4 combed cotton slivers. Find the linear density TtT of the polyester pre-drawn sliver and the combed cotton sliver. The ratio of linear density Tte. 20. How to choose the twist coefficient of roving and fine yarn? 21. When the strands are twisted, how should the twist ratio be determined? 22. What issues should be paid attention to when selecting equipment speed? 23. How to choose the equipment speed of each process? 24. What are the steps to equip the equipment? 25. What are time efficiency and planned shutdown rate? What are the influencing factors? 26. What is the consumption rate? How should I choose to calculate it? 27. Polyester and viscose blended chemical fiber fabrics, assuming the dry weight mixing ratio is 65/35 (polyester/viscose), find the mixing ratio when converted into a public moisture regain. 28. How to balance production and supply in each process workshop? 29. How to determine the total draft ratio of spinning? How to calculate the linear density of semi-finished products based on the draft ratio?
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