GB1379174A - Drawing apparatus - Google Patents

Abstract

1379174 Stretching filaments FIBER INDUSTRIES Inc 17 March 1972 [29 March 1971] 12592/72 Heading B5B [Also in Division D1] Yarns 12, 22 are drawn by being fed to the feed rolls 14, 24 of at least two adjacent draw frames, passing the yarns to a common draw roll 18 in one draw frame and thereafter passing the yarns to a second common roll 28 in the second draw frame. Roll 28 may have a greater linear velocity than roll 18, in order to produce further drawing, or it may have a smaller diameter or smaller angular velocity than roll 18 and thus acts as a relaxation roll. As shown two roll frames are modified to act as a three roll frame but a plurality of 2 to 4 roll frames may be modified to act as a 3 to 8 roll frame. The yarns 12, 22 may be monofilaments multifilaments supplied from a supply package or directly from an extruder. Polyester polyamide, polyolefin, polyacetyl, cellulose ether, acrylic, modacrylic, polyurethane (spandex) or polyvinyl chloride yarn may be used. In the example two polyethylene terephthalate yarns each comprising 24 filaments of 4À58 denier were passed through tension gates to feed rolls 14, 24, wherein 0À5% stretch was imparted. The feed rolls were at 80‹ C. to 110‹ C., draw roll 18 at 180‹ C. to 245‹ C. and relax roll 28 was at ambient temperature and its surface contained microprotuberances or was otherwise roughened. The draw ratio was from 1À1 to 1 to 7À0 to 1 and the relaxation imported between rolls 18, 28 was up to 50%, preferably 1 to 12%. The yarns were collected separately on ring and traveller takeups 21, 32.