Texparts® Weighting Arms for Short Staple Ring Spinning Machines
Pneumatic drafting system Weighting arms PK 3000 Series Product data see: Chapter 5, pages 2 – 5 Chapter 9, pages 26 – 34
Mechanical drafting system Weighting arms PK 2600 SE Series Product data see: Chapter 5, pages 6 – 13 Chapter 9, pages 35 – 46
General Information on Texparts® Short Staple Weighting Arms Draft Sizes Total Draft The amount of total draft to be applied mainly depends on the type and composition of the fibre material and the quality of the roving.The normal total draft range for speedframe roving is, in practice, as much as 50 (see fig. A Total drafts below). The choice of draft range depends on the desired yarn qualities and the operating conditions of the frame (ends down behaviour). In-house spinning trials should be carried out to determine the optimum draft range. Fig. A (Total drafts) shows common draft ranges arranged according to different fibre materials. Rear Draft The purpose of rear zone draft is to slightly tension the roving and to feed fibre material to the main draft zone in a well-stretched state. The common rear draft for series PK 3000, PK 2600 SE, PK 2100 and PK 2000 equipment ranges between 1.15 and 1.3. In special cases, rear drafts greater than 1.3 are possible with PK 2655 SE, PK 2665 SE, PK 2155/2055 and PK 2165/2065. Draft ranges for PK 2630 SE, PK 2635 SE, PK 3000, PK 2130/2025, PK 2135/2035 Rear drafts Total drafts
Mechanical drafting system Weighting arms PK 2100 Series Product data see: Chapter 5, pages 14 – 21 Chapter 9, pages 47 – 57
1.15 - 1.3
12-20 20-35 20-40 25-50 25-70
Draft ranges for PK 2655 SE, 2665 SE, PK 2155/2055 and PK 2165/2065 Rear drafts Total drafts 1.15 - 1.3 up to 50 1.3 - 1.6 50-70 1.6 - 1.8 over 70
Mechanical drafting system Weighting arms PK 2000 Series Product data see: Chapter 5, pages 22 – 29 Chapter 9, pages 58 – 67
Chapter 9-18
Extremely short carded cotton Carded cotton Combed cotton Blends of cotton and man-made fibres Pure man-made fibres
Cotton Man-made fibres Blends
Fig. A: Total drafts When determining the optimum rear zone draft care should be taken on controlled draft of the roving in the rear zone. Hard-twisted roving needs a higher rear zone draft whereas a too strong loosening effect on the roving indicates the necessity for reducing the rear draft. Values of the rear zone settings depend on the fibre to be spun, fibre length and roving twist. Chapter 9-19