Patent ID: 6254707
Filing Date: 2001-07-03
Classification: B29C,B29L,B42F,Y10T

Abstract:
The method of producing a laminated vinyl thermoplastic stationery article from thermoplastic film material including the steps of:a) providing a first film of thermoplastic material taken form the group consisting of polyethylene, polypropylene, polyvinyl chloride, metallic polyethylene, metallic polypropylene and metallic polyvinyl chloride upon an ultrasonic platen having a length and breadth sufficient to encompass the entire length and breadth of said article to be produced while providing excess material outside of the margin of the stationery article to be produced;b) providing at least a second film of thermoplastic material taken form the group consisting of polyethylene, polypropylene, polyvinyl chloride, metallic polyethylene, metallic polypropylene and metallic polyvinyl chloride bondable to said first film and overlying said first film and encompassing only a portion of said length and breadth of said first film and a portion of the length and breadth of said article to be produced and providing excess material outside of that portion of the length and breadth of the stationery article to be produced;c) applying a compound die having knife and seal edges to said first and at least said second thermoplastic films while activating said ultrasonic platen causing said platen and said die to vibrate generating frictional heat and simultaneously sealing and tear/cutting the margin of the article to be produced with the seal just inside the margin of the article to be produced and the tear/cut on the margin of the article to be produced thereby laminating the first and at least second thermoplastic films together producing an airtight leakproof seal; andd) removing the excess material from the margin of the article produced leaving the article with a uniform margin adjacent and parallel the seal.