发明名称 PACKAGING CONTAINER PROVIDED LEAK-PROOF TEAR-OPEN PERFORATIONS
摘要 <p>The invention provides a packaging container, provided with a tear-open perforation, of the kind which is produced from a laminate comprising a relatively stiff and unmalleable basic layer, at least one side of which being turned towards the inside of the package has a leakproof unbroken plastic coating, said tear perforation being so arranged that it substantially penetrates the basic layer but without penetrating the plastic layer turned towards the inside of the package, characterized in that said tear perforation along the region on the packaging container where, during the shaping of the package, the packaging material is exposed to folding or some other processing which intensely stresses the packaging material is sparsely perforated or not at all or it is made in such a way that the packaging material is not weakened to such an extent that the tear perforations breaks up but that the tear perforation along non-bent surfaces of the packaging container, or along surfaces stressed in some other way, have a more readily tearable perforation.</p>
申请公布号 CA1109420(A) 申请公布日期 1981.09.22
申请号 CA19780304216 申请日期 1978.05.26
申请人 TETRA PAK INTERNATIONAL AB 发明人 ERICSSON, THOMAS;HOLMSTROM, HAKAN
分类号 B65D5/74;B65D5/06;B65D5/54;(IPC1-7):65D85/80 主分类号 B65D5/74
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