Process and apparatus for pumping gases in a film

Details Process and apparatus for pumping gases in a film Process and apparatus for pumping gases in a film

B - Operations, Transporting

65

H

B65H 20/02 (2006.01) B29C 53/20 (2006.01) B65H 27/00 (2006.01) B65H 37/00 (2006.01)

Patent

CA 2510740

The invention is a process and apparatus for producing a cross-linked, tubular film or "tape" that uses a motor driven nip roll assembly and a product driven idler roll to pump gases contained within the film in a desired direction. The process eliminates the need to create slits to vent gases that are trapped within the film. The motor driven roll comprises a driven nip roll and a driven peristaltic roll that cooperate to drive the film forward and nip the film. The driven peristaltic roll includes a pumping section that comprises a plurality of pumping rollers that pump gases contained within the film in a direction that is the reverse direction of film travel. The product driven roll comprises a spool roller and a plurality of pumping rollers that are circumferentially spaced around the spool roller. The pumping rollers trap and pump gases contained in the film in the reverse direction of film travel.

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