US 5,334,272 AGranted

Method for producing an easily openable container

AssigneeIdemitsu Petrochemical Co., Ltd.

InventorsYukio Takata, Takeshi Shinohara

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Abstract

An easily openable container comprises (a) a multilayer container body which includes an innermost layer and an adjacent layer contacting the innermost layer, a recessed portion and a flange and (b) a lid member melt sealed to the innermost layer of the multilayer container body at the flange, where the innermost layer and the adjacent layer are peelable from each other and having between them a peel strength smaller than the peel strength between the lid member and the innermost layer. The flange has two circular notches made in the innermost layer, and the multilayer container body and the lid member are melt sealed between the two circular notches, with the proviso that a portion of the melt sealed area projects outwardly from the outer circular notch, and a depression is made in the innermost layer at the outermost edge of the projecting portion of the melt sealed area by pressing the innermost layer through the lid member. Opening is performed by the peeling off the innermost layer together with the lid member from the adjacent layer of the multilayer container body between the two circular notch and begins easily by breaking the innermost layer at the depression at the outermost edge of the projecting portion of the melt sealed area.

Claims5

Dependent claims

A method of producing an easily openable container, comprising:

grooving a multilayer container body including an innermost layer,
an adjacent layer contacting the innermost layer, the innermost layer and the adjacent layer being peelable from each other,
a recessed portion having an open end and
a flange extending circumferentially and outwardly from the open end of the recessed portion so that the flange has a first circumferential notch and a second circumferential notch which are made in the innermost layer, and the second circumferential notch is located radially outside the first circumferential notch;
melt sealing a lid member to the innermost layer of the multilayer container body at the flange between the first circumferential notch and the second circumferential notch to form a melt sealed area so that the peel strength between the lid member and the innermost layer of the multilayer container body is larger than the peel strength between the innermost layer and the adjacent layer of the multilayer container body, and a portion of the melt sealed area projects outwardly from the second circumferential notch to provide a portion for beginning opening of the easily openable container;
and
making a depression through the lid member in the innermost layer at an outermost edge of the projecting portion of the melt sealed area at the same time the lid member is melt sealed to the multilayer container body.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/915,669Filed 21 Jul 1992 · division
Priority: JP 2-15528015 Jun 1990
Granted: 2 Aug 1994
Term ends: Not estimatedThe source records don’t support an estimate.

Classification18 codes

B32B 7/06
Interconnection of layers: permitting easy separation
B32B 27/08
As the main or only constituent of a layer, which is next to another layer of the same or of a different material: of synthetic resin
B32B 27/20
Characterised by the use of special additives: using fillers, pigments, thixotroping agents
B32B 27/306
Comprising vinyl polymers; comprising acrylic polymers: comprising vinyl acetate or vinyl alcohol polymers