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:
Sep. 22, 1981
Filed:
Sep. 06, 1979
Masaaki Fujio, Suita, JP;
Fuji Seal Industry Co., Ltd., Osaka, JP;
Abstract
A method for forming a closed end on a tube of heat-shrinkable film wherein the tube is placed over a cylindrical mold with one end of the tube extending beyond top end of the mold, includes forming a pattern of grooves in the mold's top end, and then heating the tube so that it shrinks and tightly contacts and covers the grooved end of the mold. Excess film protruding from the end of the tube which has shrunk against the grooved end of the mold is cut off or folded down and then this end of the tube is pressed with a heated smooth plate against the grooved end of the mold. Excess film material remaining on this end portion of the tube is squeezed into the grooves, whereby the end of the film tube is formed with a uniform thickness and with low thermal stresses thereby reducing any tendency for distortion of the closed end and providing a surface that can be more easily printed on.