Heat seal web saver

Details Heat seal web saver Heat seal web saver

B - Operations, Transporting

29

C

B29C 65/20 (2006.01) B29C 65/00 (2006.01) B29C 65/18 (2006.01)

Patent

CA 2205827

A method and apparatus for heating sealing a web of thermoplastic or thermosetting material are disclosed. The apparatus includes a heated rotary die that cooperates with an anvil at a nip point to bond the web. The web has been pre-heated by being wrapped around portion of the perimeter of the drum. When the production of the web is interrupted, the web saver rolls lift the web away from the die so that the heated surface does not melt or otherwise damage the material.

Méthode et installation pour le thermoscellage d'une bande de thermoplastique ou d'un matériau thermodurcissable. L'installation inclut une matrice rotative chauffante en coopération avec une enclume au point de pinçage où la bande est scellée. La bande est préchauffée par enroulement autour d'une portion du périmètre du tambour. Lorsque la production de la bande thermoplastique est interrompue, un rouleau de dérivation soulève la bande pour éloigner celle-ci de la matrice et éviter que le matériau ne soit abîmé par la surface chaude de la matrice.

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