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:
Mar. 12, 2002
Filed:
Mar. 23, 2000
Heinz Hinterseer, Freilassing, DE;
Paul Kiefel GmbH, Freilassing, DE;
Abstract
In a method for simultaneously welding to one another the layers of several pairs of thermoplastic foils arranged in a stack, a primary heat energy source is positioned between two pairs of thermoplastic foils, and welding heat energy is supplied to the two pairs via the primary heat energy source. The press for performing this method has two pressing elements for applying pressure to the stack of n pairs of layers of thermoplastic foils. The two pressing elements are positioned at opposite ends of the stack and force the layers of the pairs of thermoplastic foils toward one another. A stacked arrangement of n−1 flat, bar-shaped heating elements is aligned with the two pressing elements. Between two adjacent heating elements a respective pair of thermoplastic foils is received such that the pairs of thermoplastic foils alternate with the heating elements. The stacked arrangement of the heating elements is arranged in a plane that is perpendicular to the planes of the thermoplastic foils.