Patent ID: 6454161
Filing Date: 2002-09-24
Classification: B29C,B29L,B65D

Abstract:
A packaging container comprising:a packaging sheet material having a sheet top wall portion and at least one hole formed in said sheet top wall portion, wherein said at least one hole has a predetermined extension and said sheet top wall portion defines a top wall plane; and an opening device directly injection molded into said at least one hole in said sheet top wall portion; wherein said opening device comprises: a base portion connected to said sheet top wall portion of said packaging sheet material and extending in a longitudinal plane which is substantially parallel to said top wall plane; an upper ring portion defined by said base portion releasably connecting a lid portion to the base portion; a lower ring portion defined by said lid portion; a main circumferential portion defined by said base portion, said main circumferential portion being larger than the extension of said hole and circumferentially enclosing the extension of said hole; a circumferential tearing edge provided between said lower ring portion and said upper ring portion and connecting said lid portion to said base portion, said tearing edge defining a circumferential extension and having a reduced thickness with respect to a thickness of said lower ring portion of said base portion and said upper ring portion of said lid portion; mutually mating surfaces defined by said lower ring portion and said upper ring portion for releasably locking said lower ring portion and said upper ring portion together after said lid portion has been released from said base portion by tearing said circumferential tearing edge, said mutually mating surfaces comprising a surface portion of one of said lower ring portion and said upper ring portion having a circumferential ring extension larger than said circumferential extension of said tearing edge; wherein said circumferential tearing edge comprises: a first end portion for an initial tearing of said tearing edge and an initial release of said lid portion from said base portion; two lateral portions for successive tearing of said tearing edge and a successive release of said lid portion from said base portion; and a second end portion for final tearing of said tearing edge and a final release of said lid portion from said base portion; wherein at least one of said first and second end portions has a thickness which is less than a thickness of said lateral portions.