Opening device and method for manufacturing the same, and a packaging material provided with said opening device
AssigneeTetra Laval Holdings & Finance S.A.
InventorPär Andersson
Life of this patent
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Abstract
An opening device for a packaging container, said packaging container being formed from a packaging material having an upper side constituting the outside of the packaging container and a lower side constituting the inside of the container, said opening device comprising two operational parts, a preformed support part arranged on the upper side of the packaging material and a membrane part arranged on the lower side of the container and extending into openings of the support part such as to mechanically connect the two parts, and wherein the materials of the membrane part and the support part are thermally incompatible polymer materials.
Claims16
An opening device for a packaging container, said packaging container being formed from a packaging material having an upper side constituting the outside of the packaging container and a lower side constituting the inside of the container, said opening device comprising two operational parts, a preformed support part arranged on the upper side of the packaging material and a membrane part arranged on the lower side of the packaging material and extending into openings of the support part such as to mechanically connect the two parts, and wherein the material of the membrane part is thermally incompatible with a material of the support part, such as to avoid fusion, bonding or adhesion between the two operational parts during manufacture of the opening device.
A method for manufacturing an opening device comprising the steps of:
- arranging a preform in a first mould half,
- arranging the first mould half on a first side of a packaging material, in register with a hole pattern of a packaging material,
- arranging a second mould half on the other side of the packaging material, thus forming at least one mould cavity defined by the mould halves, the preform and the packaging material,
- injecting a melt of a polymer material thermally incompatible with the preform into said at least one mould cavity, whereby the melt at least partly penetrates through openings of the preform and the packaging material, such that the preform may provide a support part for the opening device and the injected melt a membrane part of the opening device.
Dependencies are inferred from the claim text.