Manufacturing textile yarns
AssigneeErnest Scragg & Sons Limited
InventorsGeorge Waterhouse, Walter Parker
Life of this patent
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Abstract
In the manufacture of textile yarns from synthetic thermoplastic materials, such as polyamides, polyesters and polyolefins, e.g. polypropylene, a web or sheet of the material, which may be preformed or formed by extrusion or casting as a step in a continuous process, is subjected to "forging" as by a profiled roller to produce in the web or sheet parallel lines of weakness and then to such a drawing operation in a direction parallel to the lines of weakness that the web or sheet is stretched to many times its original length and, with or without assistance of other mechanical means, is thereby split into discrete, thin filaments suitable for textile yarns. 5 1 1 Anderson; Philip 1 4
Claims13
Process for the production of filaments for textile yarns from synthetic thermoplastic materials which are formable into webs and capable of being converted into filaments by division into narrow strips and stretching to many times their original length, comprising subjecting a film web of the material to forging to effect local weakening along parallel lines by passing the web between a non-yielding profiled roller and a non-yielding counter roller, at least the counter roller being heated to a temperature effective to soften the web to a forgeable condition, such that the thickness of the film web is greatly locally reduced to produce the lines of weakness by simultaneous deformation and lateral displacement of material into the regions between the lines of weakness, and thereafter at least partially converting the forged film web to filaments by rupture along the lines of weakness by stretching the film web longitudinally of the lines of weakness.
Dependencies are inferred from the claim text.