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:
Apr. 16, 2002
Filed:
Feb. 01, 2000
Abstract
An object is to prevent roughening of a rupture surface of a packaging material ( ) that is formed upon opening of a spout ( ) through application of an external force. There are provided transport means for transporting a layered packaging material ( ) that is formed of a paper substrate and resin films and that has a rupture area ( ) at a location corresponding to that of opening means; a seal unit for sealing the packaging material ( ); and heating means disposed on the upstream side of the seal unit in the transport direction of the packaging material ( ) such that the heating means is opposed to an innermost layer of the packaging material ( ) in order to heat the packaging material ( ). In this case, after being heated and melted, the resin film of the packaging material ( ) is gradually cooled. As a result, thermoplastic resin that constitutes the resin film is crystallized and becomes brittle. Accordingly, when an external force is applied by use of the opening means to thereby open the spout ( ), the resin film does not stretch. As a result, the packaging material ( ) can be easily ruptured, and the rupture surface of the packaging material ( ) is prevented from being roughened, because the resin film does not have ruptured and stretched portions coexisting in a mixed manner.