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:
Oct. 17, 1995
Filed:
Mar. 21, 1994
Ulrich Wald, Hassloch, DE;
Paper Converting Machine GmbH, Schifferstadt, DE;
Abstract
Heat-sealable packaging films, particularly plastic bags, are hot pressure welded with an apparatus having at least one, and often two welding terminals, each having an electrically heated welding wire stretched thereacross. The welding terminal preferably has an elastic silicone backing which is protected from the welding wire by a covering material in the form of a sheath which surrounds the welding wire. The sheath is preferably made of plastic, such as polytetrafluoroethylene, which surrounds the welding wire with a minimum of play. When the sheath is formed from a sheet with overlapping edges, the area of overlap runs longitudinally with the wire and is arranged on the welding terminal such that it faces away from the packaging film being welded.