method for producing hollow twisted baendern from geschaeumten synthetic resins for processing web and articles, knitted or crocheted

摘要

A thread of foamed synthetic resin is made by subjecting a strip of foamed synthetic resin to tension and/or compression such that hollow granules therein are elongated in the longitudinal direction of the strip, and then twisting the resultant tape, and subjecting the twisted tape to cone-winding. The strip may be softened by heat or by chemical means before the granules therein are subjected to elongation, and may be coated, before twisting, with a synthetic resin. The tape formed of elongated granules may be twisted alone or may be twisted together with other fibrous threads of, for example, polyethylene or nylon to form a composite thread of enhanced weavability. Several of the foamed tapes may be twisted together to increase the strength of the resulting thread. The cone-winding step may be followed by further softening, elongation or coating operations. Specified foamed synthetic resins are those derived from styrene and its derivatives, vinyl compounds, cellulose esters, acrylonitrile methyl methacrylate, aldehydes and amides. The invention is illustrated by the production of threads from strips cut from foamed polystyrene paper. The threads are lustrous, have an apparent density of less than 0.4 and are suitable for knitting and weaving.