B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 65/74 (2006.01) B29C 65/00 (2006.01) B29C 65/18 (2006.01)
Patent
CA 2414084
A method of severing and sealing a film formed of a thermoplastic material includes heating a cutting edge implement to a temperature sufficient to melt but not to burn thermoplastic material, feeding a plurality of layers of the film between the cutting edge implement and an opposing surface, and moving the cutting edge implement, which is preferably a supported hot wire, and the opposing surface relative to one another to pinch the plurality of layers of ilm therebetween. Thereafter, any relative lateral movement between the cutting edge implement, the film, and the opposing surface is suspended, while the cutting edge implement and the opposing surface are relatively biased together with the plurality of layers of film pinched therebetween, until the cutting edge implement cuts through the plurality of layers of film, contacts the opposing surface, and seals the plurality of layers of film together.
Ce procédé de séparation et de scellement d'un film (108) formé d'un matériau thermoplastique consiste à chauffer un outil à bord coupant (110) pour le porter à une température suffisante pour faire fondre, sans le brûler, le matériau thermoplastique, à acheminer plusieurs couches du film (108) entre l'outil à bord coupant (110) et une surface opposée (134), à déplacer, l'un par rapport à l'autre, l'outil à bord coupant (110) -lequel est, de préférence, un fil métallique chaud sur support- et la surface opposée (134), afin de pincer les couches de film entre l'outil et la surface opposée, puis à cesser tout déplacement latéral entre l'outil à bord coupant (110), le film (108) et la surface opposée (134), pendant que l'outil (110) et la surface (134) sont inclinés relativement ensemble, tandis que les couches de film (108) sont pincées entre ceux-ci, jusqu'à ce que l'outil à bord coupant (110) coupe à travers les couches de film (108), entre en contact avec la surface opposée (134) et scelle ensemble les couches de film (108).
Gangler Stephen P.
Hoffman Jeffrey S.
Velez P. Gregory
Woody Clark
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
S.c. Johnson Home Storage Inc.
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