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:
Aug. 21, 1990
Filed:
Feb. 07, 1989
William D Kreager, Jr, Dallas, TX (US);
Jerry M Reaves, Midlothian, TX (US);
Fredrick J Priggs, Dallas, TX (US);
Frito-Lay, Inc., Dallas, TX (US);
Abstract
A back-up pad is provided over an anvil surface of a back-up plate, and between the anvil surface and a sealing surface of a sealing die, in an apparatus for forming seals between layers of film material. The back-up pad has a slip surface on one side thereof and a spring surface on an opposite side thereof, the slip surface opposing the sealing face of the die so that the layers of film material pass between the sealing die and the back-up pad during seal formation. The spring surface is comprised of a plurality of outwardly extending resilient spring loops that act against the back-up plate during seal formation, the spring loops resiliently urging the layers of film material against the sealing face to effect seal formation between the film layers while cushioning the film layers to prevent damage to the film layers due to drag between layers and the die face.