Patent ID: 7757892
Filing Date: 2010-07-20
Classification: B65D

Abstract:
1. A plastic closure device for use with a pouch receptacle comprising: an annulus with a cylindrical pour-out spout connectable to the receptacle; a screw cap screwed onto the annulus; a cylindrical piercing means open in the axial direction at both sides and displaceably mounted at said annulus, wherein catch means are present in the screw cap, said catch means moving the piercing means helically downwards when screwing off the screw cap for the first time, and wherein the piercing means is equipped with at least one cutting element, characterized in that three cutting elements are arranged distributed over a periphery of a lower edge, wherein the cutting elements are teeth and the distance of the tips of a first tooth to a second tooth on the periphery has a magnitude X, and a distance of the tip of the second tooth to the third tooth has the magnitude Y, whilst a distance of the tips of the third tooth to the first tooth is Z, and that a stiffening shoulder running in the peripheral direction is allocated to each tooth, wherein the stiffening shoulder is arranged on two teeth following the tooth in a rotational cutting direction on a lower edge of a peripheral wall of the cylindrical piercing means, and on a third tooth running ahead of this tooth in the cutting direction on a lower edge of a peripheral wall of the cylindrical piercing means, wherein the tips of all three teeth are arranged at the same height distanced to the lower edge and a cutting edge on a first and second teeth runs from a tip to the lower edge and a cutting edge on a third tooth runs from a tip to an associated stiffening shoulder, and that the receptacle to be opened is manufactured of a single-layer or multi-layer plastic film wherein the height of the stiffening shoulder corresponds to at least a third of a height of the tooth from the lower edge of the cylindrical piercing means up to the tip of the tooth, and maximally two thirds of this height.