Heat-shrinkable multilayer material
AssigneeMicro Shaping, Ltd.
InventorsBernhard Fink, Michael Krainz, Michael Washuettl
Life of this patent
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Abstract
A heat-shrinkable multilayer material for packaging, in particular food packaging, comprises a first layer made of heat-shrinkable material, a microwave susceptible material covering at least a part of the first layer, at least one second layer made of shrinkable or non-shrinkable material, the first and second layer can be connected to each other by embedding the microwave susceptible material, wherein the microwave susceptible material is arranged in a pattern between the first and second layer, the pattern creating areas of increased stiffness within the multilayer material when microwave energy is applied onto.
Claims24
A heat-shrinkable multilayer material for packaging, comprising:
- a first layer made of heat-shrinkable material;
- a layer of microwave susceptible material partially covering the first layer and defining a shrinkable area of the first layer;
- an intermediate layer having an intermediate layer area larger than the shrinkable area, the intermediate layer covering the microwave susceptible material and extending beyond the shrinkable area;
- a second layer made of non-shrinkable material and covering the intermediate layer;
- wherein the microwave susceptible material is arranged in a pattern between the first layer and the intermediate layer, the pattern creating areas of increased stiffness after microware energy is applied to the microwave susceptible material, and the first layer and the second layer are connectible to each other outside a periphery of the intermediate layer and not connectible to each other where separated by the intermediate layer.
A food bag comprising a flexible material in a form of a bag, the flexible material, comprising:
- a first layer made of flexible heat-shrinkable material;
- a microwave susceptible material covering part of the first layer and defining a shrinkable area of the first layer;
- an intermediate layer having an intermediate layer area greater than the shrinkable area, the intermediate layer covering and extending beyond the shrinkable area;
- a second layer made non-shrinkable material and covering the intermediate layer;
- wherein the microwave susceptible material is arranged in a pattern between the first layer and the intermediate layer, the pattern creating areas of increased stiffness after microwave energy is applied such that the first layer becomes stiffer, and the first layer and the second layer are connectible to each other outside a periphery of the intermediate layer and not connectible to each other where separated by the intermediate layer.
A method of making a heat-shrinkable multilayer material, comprising providing a first layer made of heat-shrinkable material and a second layer made of non-shrinkable material;
- patterning a portion of the first layer with a microwave susceptible material, the patterned microwave susceptible material capable of creating areas of increased stiffness as a result of applying microwave energy to the microwave susceptible material;
- providing an intermediate layer that covers and extends beyond the microwave susceptible material;
- aligning the first layer and the second layer such that the patterned microwave susceptible material and the intermediate layer are positioned between the first layer and the second layer and connecting the first layer and the second layer together in an area surrounding the intermediate layer.
Dependencies are inferred from the claim text.