The Platt Self Twist Spinner Type 888
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The Type 888 Self Twist Spinner is a standard machine designed and built to one basic specification and produces four parallel cheese type packages, each containing two self twisted thread elements. The machine is essentially self contained and is delivered fully assembled.
For knitting applications, the self twist yarn can be used without further twisting, to produce fabrics whose aesthetic and dynamic properties are comparable in every respect with their ring spun equivalents. At the bulking operation, any of the established continuous bulking machines can be used either to produce a soft wound cone for dying or wound as a waxed and cleared yarn for direct knitting.
The use of hank bulking is not recommended due to the twist and strength reduction experienced after bulking.
For woven fabrics, the self twist yarn must be twisted after spinning to produce a uni-directional twisted product which, after steam setting, can be woven as warp or weft to produce fabrics which, in every respect, are indistinguishable from those produced from ring spun yarns.
Figures 2a and 2b illustrate the comparative processing routes for self twist and ring spun yarns for:
- High Bulk Acrylic knitting yarns, and
- Worsted or blended weaving yarns.
Whilst preparation is common to both spinning systems, there are significant economies in the post spinning operations of the self twist spinning system.
The cost comparison given in figures 3 and 4 show the total process costs (ie. Summation of labour, space, power and capital costs) and are expressed in pence per kilogram of yarn produced.
For the count ranges covered, the savings in the total process costs average 28% for weaving yarns and 60% for High Bulk Acrylic knitting yarns.
