Unwind and feed system for elastomeric thread

Details Unwind and feed system for elastomeric thread Unwind and feed system for elastomeric thread

B - Operations, Transporting

65

H

B65H 57/16 (2006.01) B65H 49/06 (2006.01) B65H 49/14 (2006.01) B65H 57/14 (2006.01) D02H 1/00 (2006.01)

Patent

CA 2635258

An overend unwind system (10) for unwinding tacky elastomeric fiber threads (12) such as uncoated spandex thread, capturing the ballooning affect of the thread (12) as the thread (12) leaves the spool (22), applying a first-stage tension control on the thread adjacent where the thread leaves the spool (22), feeding the unwound thread (12) to a nip (14) in a downstream process, and applying a final tension increment to the thread (12) adjacent where the thread (12) enters the downstream process. All thread guide surfaces (66, 70, 88) encountered by the thread (12) after leaving the spool (22), and while the thread (12) is under designed operating tension, are moving surfaces, such that the tensioned thread (12) thereby experiences a reduced level of drag as the thread (12) traverses its path of travel from the spool (22) to the downstream process.

Système de déroulement à la défilée permettant de dérouler des fils de fibre élastomère collants comme le fil spandex non revêtu, de capturer l'effet de ballonnement du fil lorsque ce dernier quitte la bobine, d'appliquer une vérification de tension de premier niveau sur le fil adjacent au point auquel le fil quitte la bobine, d'avancer le fil déroulé vers une emprise dans un processus en aval, et d'appliquer un incrément de tension final au fil adjacent au point auquel le fil pénètre dans le processus en aval. Toutes les surfaces de guidage de fil rencontrées par le fil au sortir de la bobine, et pendant que le fil subit une tension d'exploitation déterminée, sont des surfaces mobiles, si bien que le fil tendu fait alors l'objet d'un niveau réduit de traînée en suivant son trajet de la bobine au processus en aval.

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