The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 05, 1994
Filed:
Apr. 13, 1993
Arnold E Perrett, Whitby, CA;
Du Pont Canada Inc., Mississauga, CA;
Abstract
A heat sealing assembly, for sealing through at least two layers of thermoplastic film is disclosed. It is particularly adapted for use with a vertical form, fill and seal machine for packaging flowable materials. The heat sealing assembly comprises two jaws, resilient clamping elements and a heat sealing element, at least one of the jaws being capable of transverse motion and adapted to collapse a tubular film made from the thermoplastic film and passing between the jaws, each of said jaws having said element mounted thereon, said clamping elements being adapted to grip thermoplastic film which passes therebetween and urge said gripped film towards said jaws when the jaws close and to release said film when the jaws open. Clamping is accomplished without an activating device other than the jaws themselves. Preferably there are clamping elements on both sides of the jaws. Preferably the clamping elements are made of a flexible rubber.