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US 2013/0153577 A1Published application
Peelable closure for container
AssigneeBerry Plastics Corporation
InventorsJau-Ming Su, Charisa Sofian, Paul Wolak
Life of this patent
Estimating the term…
Abstract
A steam-ventable package includes a container formed to include an interior region and a mouth opening into the interior region and a closure coupled to the container to close the mouth. The closure is made from a peelable film coupled to a brim included in the container and configured to be removed from the brim in response to application of shear force applied to the peelable film.
Claims39
A cold-durable, heat-resistant, peelable film for packaging a food product, comprising
- (a) a sealant layer and
- (b) a protective layer, wherein
- i) the sealant layer is a polypropylene-based monolayer polyolefin layer comprising at least one polyethylene polymer resin or a polypropylene-based multilayer polyolefin film comprising at least two different polyethylene polymer resins,
- ii) the sealant layer does not fracture when exposed to a temperature in a range of about −20° C. to about 0° C.,
- iii) the sealant layer does not melt or burst when exposed to a temperature of up to about 105° C. without melting,
- iv) the sealant layer may be peeled either before or after heating with a peel force in a range of about 1 lbf/in to about 5 lbf/in, and
- v) the protective layer may be included as part of the sealant layer.
4 more elements
A product, comprising
- (a) a food product and
- (b) a package containing the food product, the package comprising a container and a cold-durable, heat-resistant, peelable film, wherein the cold-durable, heat-resistant, peelable film comprises
- a sealant layer comprising
- (i) an inner heat sealable sub-layer formed from at least one polypropylene/alpha-olefin copolymer, the polypropylene/alpha-olefin copolymer having a melt flow rate in a range of about 0.5 g/10 min. to about 45 g/10 min, and at least two different polyethylene polymer resins one of which has a melt index in a range of about 0.50 g/10 min. to about 20 g/10 min,
- (ii) a core sub-layer adjacent to the heat sealable sub-layer, the core sub-layer being formed from a polymeric material having a melting point of at least 71° C., and
- (iii) an outer skin sub-layer formed from at least one polyethylene polymer resin, the at least one polyethylene polymer resin having a melt index in a range of about 0.50 g/10 min. to about 20 g/10 min, and
- a protective layer laminated to the outer skin sub-layer, the protective layer being formed from a polymer material that is temperature resistant at a temperature of about 105° C.,
- wherein the sealant layer does not fracture when exposed to a temperature in a range of about −20° C. to about 0° C.,
- wherein the sealant layer may be peeled either before or after heating with a peel force in a range of about 1 lbf/in to about 5 lbf/in, and
- wherein the package permits the frozen food to be heated directly in a microwave or other oven at a temperature of up to about 105° C. without melting or bursting the container.
7 more elements
A lid for a container, the lid comprising
- (a) a brim adapted to be fittable on or around a rim of the container,
- (b) a cold-durable, heat-resistant, peelable film associated with the brim and comprising
- (i) a sealant layer comprising:
- (A) an inner heat sealable sub-layer formed from at least one polypropylene/alpha-olefin copolymer, the polypropylene/alpha-olefin copolymer having a melt flow rate in a range of about 0.5 g/10 min. to about 45 g/10 min, and at least two different polyethylene polymer resins one of which has a melt index in a range of about 0.50 g/10 min. to about 20 g/10 min,
- (B) a core sub-layer adjacent to the heat sealable sub-layer, the core sub-layer being formed from a polymeric material having a melting point of at least 71° C., and
- (C) an outer skin sub-layer formed from at least one polyethylene polymer resin, the at least one polyethylene polymer resin having a melt index in a range of about 0.50 g/10 min. to about 20 g/10 min, and
- (ii) a protective layer laminated to the outer skin sub-layer, the protective layer being formed from a polymer material that is temperature resistant at a temperature of about 105° C., and
- (c) an adhesive associated with the rim to facilitate attachment of the lid to a container,
- wherein the sealant layer does not fracture when exposed to a temperature in a range of about −20° C. to about 0° C.,
- wherein the sealant layer may be peeled either before or after heating with a peel force in a range of about 1 lbf/in to about 5 lbf/in, and
- wherein the container permits the frozen food to be heated directly in a microwave oven or other source of heating energy at a temperature of up to about 105° C. without melting or bursting the container.
8 more elements
A steam venting system, comprising
- (a) a container and
- (b) a cold-durable, heat-resistant, peelable film associated with the container and comprising
- (i) a sealant layer comprising
- (A) an inner heat sealable sub-layer formed from at least one polypropylene/alpha-olefin copolymer, the polypropylene/alpha-olefin copolymer having a melt flow rate in a range of about 0.5 g/10 min. to about 45 g/10 min, and at least two different polyethylene polymer resins one of which has a melt index in a range of about 0.50 g/10 min. to about 20 g/10 min,
- (B) a core sub-layer adjacent to the heat sealable sub-layer, the core sub-layer being formed from a polymeric material having a melting point of at least 71° C., and
- (C) an outer skin sub-layer formed from at least one polyethylene polymer resin, the at least one polyethylene polymer resin having a melt index in a range of about 0.50 g/10 min. to about 20 g/10 min, and
- (ii) a protective layer laminated to the outer skin sub-layer, the protective layer being formed from a polymer material that is temperature resistant at a temperature of about 105° C.,
- wherein the sealant layer does not fracture when exposed to a temperature in a range of about −20° C. to about 0° C.,
- wherein the sealant layer may be peeled either before or after heating with a peel force in a range of about 1 lbf/in to about 5 lbf/in, and
- wherein the container permits the frozen food to be heated directly in a microwave or other oven at a temperature of up to about 105° C. without melting or bursting the container, and
- (c) a plurality of venting apertures extending through the peelable film so as to create a plurality of open passageways through which steam can pass from within the container to the outside.
8 more elements
A method of heating an article in a container and venting steam created therefrom, comprising
- a) providing an article to be heated;
- b) providing a receptacle for holding the article, the receptacle comprising a container and cold-durable, heat-resistant, peelable film, comprising
- (i) a sealant layer,
- (ii) a protective layer, wherein
- A) the sealant layer is a polypropylene-based monolayer polyolefin layer comprising at least one polyethylene polymer resin or a polypropylene-based multilayer polyolefin film comprising at least two different polyethylene polymer resins,
- B) the sealant layer does not fracture when exposed to a temperature in the a range of about −20° C. to about 0° C.,
- C) the sealant layer does not melt or burst when exposed to a temperature of up to about 105° C. without melting,
- D) the sealant layer may be peeled either before or after heating with a peel force in a range of about 1 lbf/in to about 3 5 lbf/in, and
- E) the protective layer may be included as part of the sealant layer, and
- (iii) a plurality of venting apertures extending through the peelable film so as to create a plurality of open passageways through which steam can pass from within the container to the outside,
- c) applying the peelable film to the container containing the article so as to form a seal, and
- d) heating the article by applying energy to the article in the form of either heat or microwave energy such that seam created during heating is vented outside the container via the plurality of venting apertures.
9 more elements
Dependencies are inferred from the claim text.