This is known as ‘tow to top’ conversion. Of course, continuous filaments from synthetic fibres can be cut into staple lengths through a separate filament cutting process to form filament staple suitable for a conventional spinning process using raw synthetic- or blended-staple fibres. Continuous filament yarns, when simply drawn after spinning to produce desirable mechanical properties, tend to exhibit smoothness, evenness, and parallelism compared to the less regular, more bulky and hairy staple-fibre spun yarns. Atkinson, in False Twist Textured Yarns, 2012 1.4 Achieving desirable fabric properties through texturingįabrics manufactured from filament silk, and indeed unmodified continuous filament synthetic yarns, have characteristics that are very different to yarns spun from staple fibres such as cotton or wool, staple synthetic fibres, or staple fibre blends such as cotton and polyester or wool and nylon. The low wet strength may have been a contributory factor.
The first cellulosic continuous filament yarns, rayon and acetate, did not impact on the rope industry, though high-tenacity viscose became important in tyre cords. This was an opportunity for rope-makers to exploit with new low-twist structures. Some structure is needed to give a coherent rope but, whereas in staple fibre ropes a substantial level of twist is needed to generate a self-locking structure and more to maximise strength, in continuous filament structures maximum strength is achieved at the low level needed to give support to weak places in filaments. The filaments would spread out, could become entangled or snag on neighbouring objects. In practice, the tow would not be easy to handle. In principle a tow of parallel filaments would support a load.
Hearle, in Specialist Yarn and Fabric Structures, 2011 3.2.1 Continuous filament yarnsĬontinuous filament yarns do not need twist to transmit stress from one fibre to another. Developments in rope structures and technology
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