Layered web sealing and severing head and method for use...

B - Operations – Transporting – 65 – B

Patent

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Details

B65B 61/10 (2006.01) B29C 65/02 (2006.01) B29C 65/74 (2006.01) B65B 9/08 (2006.01) B65B 51/10 (2006.01)

Patent

CA 2601320

A sealing assembly is employed to clamp together layers of a layered web, such as two layers of flexible laminate plastic film, and to bond and cut the layers by applying heat and pressure. The sealing assembly may include a pair of jaws, one of which has a sealing head with a conductive knife protruding from a tapered dielectric supporting base. The knife has a high thermal conductivity relative to the supporting base. A current supplied through the knife heats it and the heat of the knife raises the temperature of the supporting base to a baseline temperature. When the head abuts the layered web, a spike current through the knife raises its temperature momentarily to melt through, and therefore sever, the web.

Un ensemble d'étanchéification est utilisé pour assembler des couches d'une bande à plusieurs couches, notamment deux couches d'un film plastique lamellaire souple, et pour lier et couper les couches par application de chaleur et de pression. L'ensemble d'étanchéification peut comporter une paire de mâchoires, dont une présente une tête d'étanchéification ayant un couteau conducteur faisant saillie depuis une base de support diélectrique conique. Le couteau présente une conductivité thermique élevée par rapport à la base de support. Un courant est acheminé à travers le couteau pour le chauffer et la température de la base de support augmente jusqu'à atteindre une température de base. Lorsque la tête vient en aboutement sur la bande à plusieurs couches, un courant transitoire traversant le couteau augmente sa température momentanément afin de fondre, et par conséquent, de former la bande.

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