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US 5,177,332 AGranted
Microwave energy susceptible conformable laminate packaging materials
AssigneeE. I. Du Pont de Nemours and Company
InventorDan S. C. Fong
Life of this patent
Estimating the term…
Abstract
A laminated wrap for packaging articles of food requiring browning and crispening and a degree of shielding during microwave cooking is disclosed. The wrap comprises a layer of flexible, heat resistant, microwave transparent plastic film, a layer of flexible, heat resistant, heat stable, microwave transparent film, and a layer of substantially continuous microwave susceptor material located on an interior surface of a film of the laminate.
Claims22
A conformable multilayer laminated structure useful for packaging food for microwave cooking, comprising:
- (a) at least one layer of flexible, microwave transparent plastic layer to withstand a temperature of about 220.degree. C. without melting or degrading;
- (b) at least one layer of flexible microwave transparent plastic film to withstand a temperature of about 220.degree. C. without melting or degrading, which film further exhibits less than about 2% shrinkage when exposed for 30 minutes to a temperature of 150.degree. C.;
- and
- (c) at least one layer of substantially continuous microwave susceptor material located on a surface of a film of the laminate, said layer being located between film (a) on one side and film (b) on the other side, and being present in sufficient thickness to cause the multilayer structure to heat under microwave cooking conditions to a temperature suitable for browning or crispening of food placed adjacent thereto.
1 more element
A package suitable for containing food and browning or crispening the surface of food in a microwave oven comprising a conformable multilayer laminated structure, which structure comprises:
- (a) at least one layer of flexible, microwave transparent plastic film able to withstand a temperature of about 220.degree. C. without melting or degrading;
- (b) at least one layer of flexible microwave transparent plastic film able to withstand a temperature of about 220.degree. C. without melting or degrading, which film further exhibits less than about 2% shrinkage when exposed for 30 minutes to a temperature of 150.degree. C.;
- and
- (c) at least one layer of substantially continuous microwave susceptor material located on a surface of a film of the laminate, said layer being located between film (a) on one side and film (b) on the other side, and being present in sufficient thickness to cause the multilayer structure to heat under microwave cooking conditions to a temperature suitable for browning or crispening of food placed adjacent thereto,
- said structure being wrapped about the food.
2 more elements
A package suitable for containing and cooking a food item which requires browning or crispening of bottom and side surfaces and shielding of its top surface, said package comprising:
- (a) a bottom portion conformed to the bottom and side surfaces of the food item, extending to the level of the upper surface of the food item, said bottom portion comprising a conformable multilayer structure, which structure comprises:
- (i) at least one layer of flexible, microwave transparent plastic film able to withstand a temperature of about 220.degree. C. without melting or degrading;
- (ii) at least one layer of flexible microwave transparent plastic film able to withstand a temperature of about 220.degree. C. without melting or degrading, which film further exhibits less than about 2% shrinkage when exposed for 30 minutes to a temperature of 150.degree. C.;
- (iii) at least one layer of substantially continuous microwave susceptor material located on a surface of a film of the laminate, said layer being located between film (i) one side and film (ii) on the other side, and being present in sufficient thickness to cause the multilayer structure to heat under microwave cooking conditions to a temperature suitable for browning or crispening of food placed adjacent thereto;
- and
- (iv) at least one surface layer of heat sealable thermoplastic resin;
- and said package further comprising
- (b) a substantially microwave reflecting cover, said cover being at least partially sealed to the bottom portion of the package, thereby forming a space to contain the food item.
5 more elements
A conformable multilayer laminated structure useful for packaging food for microwave cooking, comprising:
- (a) at least one layer of flexible microwave transparent plastic film able to withstand a temperature of about 220.degree. C. without melting or degrading;
- (b) at least one layer of cellophane able to withstand a temperature of about 220.degree. C. without melting or degrading, which film further exhibits less than about 2% shrinkable when exposed for 30 minutes to a temperature of 150.degree. C.;
- and
- (c) at least one layer of substantially continuous microwave susceptor material located on a film of the laminate, said layer being located between film (a) on one side and film (b) on the other side, and being present in sufficient thickness to cause the multilayer structure to heat under microwave cooking conditions to a temperature suitable for browning or crispening of food placed adjacent thereto.
1 more element
A conformable multilayer laminated structure useful for packaging food for microwave cooking, comprising:
- (a) at least one layer of flexible, microwave transparent plastic film to withstand a temperature of about 220.degree. C. without melting or degrading;
- (b) at least one layer of flexible microwave transparent plastic film to withstand a temperature of about 220.degree. C. without melting or degrading, which film further exhibits sufficiently low shrinkage at microwave cooking temperatures that the resulting laminated structure shrinks at most about 20% in any dimension upon exposure to a 700 W microwave energy field for 10 seconds.
- (c) at least one layer of substantially continuous microwave susceptor material located on a surface of a film of the laminate, said layer being located between film (a) on one side and film (b) on the other side, and being present in sufficient thickness to cause the multilayer structure to heat under microwave cooking conditions to a temperature suitable for browning or crispening of food placed adjacent thereto.
Dependencies are inferred from the claim text.