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Method and device for the mask welding of moving plastic films by lasers

  • US 7,297,222 B2
  • Filed: 05/03/2004
  • Issued: 11/20/2007
  • Est. Priority Date: 05/22/2003
  • Status: Expired due to Fees
First Claim
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1. A method for welding plastic films together comprising:

  • providing a transparent endless film;

    providing an absorbent endless film;

    providing a lower pressure roller;

    providing an upper pressure roller;

    providing a mask roller carrying a mask;

    providing a laser beam;

    providing means for driving the mask roller independently from the pressure rollers;

    rotating the mask and pressing the endless films together by the pressure rollers within a welding zone,moving the endless films in synchronism with the rotating mask through the welding zone; and

    penetrating the rotating mask and the endless transparent film with the laser beam when the films are in the welding zone, wherein the transparent film is connected to the absorbent film at locations defined by the mask.

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