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US 7,381,453 B2Granted
Packaging film
AssigneeInternational Trex, Ltd
InventorAbdul Aziz Okhai
Life of this patent
Estimating the term…
Abstract
The present invention relates to packaging film for use in packaging of food products which may be heated whilst still packaged. In particular, the invention relates to packaging which may be hermetically sealed and, during heating, is able to allow a build up of pressure within the packaging, without the packaging exploding or bursting.
Claims49
A packaging film comprising:
- a carrier layer which is impermeable to gases and fluids and a perforated seal layer which may be heat sealed to a packaging material to which the packaging film is to be attached, wherein the carrier layer and the perforated seal layers are adhered to one another directly upon sealing the packaging film to a packaging material opening with an application of heat and pressure wherein the heat seal releases when heated to a predetermined temperature to allow the packaging material to vent during heating.
A packaging film comprising:
- a carrier layer which is impermeable to gases and fluids, having two sides;
- a perforated seal layer having two sides;
- and
- a heat seal layer which is impermeable to gases and fluids, applied to one of the two sides of either the carrier layer or the perforated seal layer;
- wherein the carrier layer and the perforated seal layer are adhered to one another by the heat seal layer upon sealing the packaging film to a packaging material and said packaging film hermetically seals said packaging material, opening with an application of heat and pressure;
- wherein the heat seal layer releases when heated to a predetermined temperature to allow the packaging material to vent during heating.
3 more elements
A packaging film comprising:
- a carrier layer which is impermeable to gases and fluids;
- a heat seal layer which is impermeable to gases and fluids, applied to the carrier layer;
- and
- a perforated seal layer, whereby the heat seal layer is positioned between the carrier layer and the perforated layer;
- wherein:
- the perforated seal layer comprises a plurality of perforations forming channels which are closed when the packaging film is sealed to a packaging material and said packaging film hermetically seals said packaging material;
- and the heat seal layer releases when heated to a predetermined temperature allowing said channels to open to allow venting during heating.
4 more elements
A packaging film comprising:
- a perforated seal layer comprising a plurality of channels;
- a heat seal layer which is impermeable to gases and fluids, applied to the perforated layer;
- and
- a carrier layer which is impermeable to gases and fluids, attached to the heat seal layer opposite the perforated seal layer;
- wherein the channels are sealed when the packaging film is sealed to a packaging material and said packaging film hermetically seals said packaging material;
- and the heat seal layer releases when heated to a predetermined temperature to allow the channels to become unsealed during heating.
3 more elements
A packaging film comprising:
- a carrier layer which is impermeable to gases and fluids, having two sides;
- a first heat seal layer which is impermeable to gases and fluids, applied to one of the two sides of the carrier layer;
- a perforated seal layer having two sides;
- and
- a second heat seal layer applied to one of the two sides of the perforated seal layer, wherein the carrier layer and the perforated seal layer are adhered to one another by the heat seal layers upon sealing the packaging film to an opening of a packaging material with an application of heat and pressure, and said packaging film hermetically seals said packaging material, wherein the heat seal layers release when heated to a predetermined temperature to allow the packaging material to vent during heating.
2 more elements
A packaging film comprising:
- a carrier layer which is impermeable to gases and fluids, having two sides;
- a first heat seal layer which is impermeable to gases and fluids, applied to one of the two sides of the carrier layer;
- a perforated seal layer having two sides comprising a plurality of perforations forming channels;
- and
- a second heat seal layer applied to one of the two sides of the perforated seal layer, wherein the two heat seal layers are intermittently attached by an adhesive;
- wherein the channels are closed when the packaging film is sealed to a packaging material, and the heat seal layers release when heated to a predetermined temperature to allow the channels to open during heating.
3 more elements
Dependencies are inferred from the claim text.