B - Operations – Transporting – 65 – H
Patent
B - Operations, Transporting
65
H
B65H 18/08 (2006.01) B65H 18/28 (2006.01) B65H 23/02 (2006.01)
Patent
CA 2237042
The present invention relates mainly to a machine for winding film, to a method of manufacturing spools of pre-stretched film, and to spools of pre-stretched film obtained thereby. The method of winding spools of pre-stretched stretchable film of the invention includes importing oscillation to the film, advantageously with a component perpendicular to the axis of the film. For example, during pre-stretching and winding of the film on a take-up spool, a feed spool, i.e. a spool from which the stretchable film for stretching is taken, is caused to oscillate, and/or the take-up core is caused to oscillate. This ensures that successive layers of film are offset, in particular at the margins of the film. Spools of film obtained in this way do not have portions of extra thickness and lower tension at the margins as is the case for prior art spools of pre-stretched film. The present invention is mainly applicable to wrapping, with the film being paid out manually.
Cette invention concerne principalement une machine à bobiner une pellicule, une méthode de bobinage de pellicules pré-étirées et les bobines de pellicule pré-étirée ainsi obtenues. La méthode de bobinage de pellicules étirables pré-étirée comprend la mise en oscillation de la pellicule, avantageusement au moyen d'un élément perpendiculaire à l'axe de la pellicule. Par exemple, au cours du pré-étirage et du bobinage de la pellicule sur la bobine enrouleuse, une bobine d'alimentation, c'est-à-dire une bobine dont est déroulée la pellicule étirable en vue de son pré-étirage, est forcée à osciller. Elle peut osciller en même temps que la bobine enrouleuse ou, seule, la bobine enrouleuse peut osciller. Cette mise en oscillation a pour effet de décaler les couches successives de pellicule, en particulier aux marges de la pellicule. Les bobines ainsi obtenues ne présentent pas de surépaisseurs localisées et de tension réduite aux marges contrairement aux bobines de pellicule pré-étirée réalisées selon les techniques antérieures. Cette invention trouve principalement une application en techniques de banderolage manuel.
Jaconelli Georges
Martin-Cocher Jean-Paul
Finlayson & Singlehurst
Itw Mima Systems
Thimon Societe Anonyme
LandOfFree
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