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:
Jun. 11, 1985
Filed:
Aug. 23, 1982
Kenth Jacobsson, Sodra Sandby, SE;
Tetra Pak Developpement SA, Pully, CH;
Abstract
Opening arrangements for packing containers which are manufactured from a flexible material and intended for pressurized contents, e.g. beer, are sometimes in the form of a tear-off cover strip which is sealed to the packing container wall and covers a pouring opening punched out in the same. In order to withstand the high internal pressure which is caused by the contents, the seal between the cover strip and the packing material must be strong, which detrimentally affects the openability of the packing container. By ensuring that the mutual bond between the different layers in the packing laminate is weaker than the seal between the cover strip and the outer layer of the container material, a readily opening packing container is provided, in spite of the seal between the cover strip and the packing laminate being of a strength such that the risk of leakage or unintentional opening is small. By sealing the cover strip in a zone extending around the pouring opening which zone is at some distance from the actual pouring opening and by providing the pouring opening with a 'set in' pouring edge, the properties of the opening arrangement are optimized further without increasing the risk of leakage or making the handling more difficult.