公开(公告)号：US4858780A

公开(公告)日：1989-08-22

申请号：US242127

申请日：1988-09-09

Applicant: Hiroshi Odaka ,  Tsuyoshi Kishida

Inventor： Hiroshi Odaka ,  Tsuyoshi Kishida

IPC: B65D17/40 ,  B65D77/20

CPC classification number: B65D77/2096 ,  B65D77/2044 ,  B65D2577/2033 ,  B65D2577/205 ,  B65D2577/2066 ,  B65D2577/2083

Abstract: A hermetically sealed package comprising:(a) a multilayer container comprising at least an innermost layer and a layer adjacent to the innermost layer, the innermost layer and the layer adjacent to the innermost layer being joined by a pressure sensitive adhesive, the multilayer container including(1) a recessed portion;(2) a flat flange portion adjoining integrally the rim of the recessed portion; and(3) a notch surrounding the boundary between the recessed portion and the flat flange portion, the notch being provided on the flat flange portion in the innermost layer of the multilayer container; and(b) a top film including(1) a lid portion for sealing the multilayer container, the lid portion being adhered strongly to the flat flange portion of the multilayer container at the outside of the notch; and(2) a tab portion for picking the top film, the tab portion extending from the rim of the lid portion, being integral with the lid portion, and being not adhered to the flat flange portion;the coefficient of adhesion between the multilayer container and the top film being larger than the coefficient of adhesion between the innermost layer of the multilayer container and the layer adjacent to the inner most layer of the multilayer container generated by the pressure sensitve adhesive, whereby upon progressive separation of the top film from the tab portion, the innermost layer is progressively peeled from the layer adjacent to the innermost layer, with the innermost layer inside the notch remaining unpeeled; and the pressure sensitive adhesive enabling to reseal the hermetically sealed package after opening.