US 5,175,031 AGranted

Laminated sheets for microwave heating

AssigneeGolden Valley Microwave Foods Inc.

InventorMichael J. Ochocki

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Abstract

A coated laminate is described comprising a microwave transparent supporting sheet or substrate such as paper, paperboard or plastic upon which is printed a susceptor lamina comprising a cured dispersion of an organic printing ink vehicle matrix in which is uniformly suspended at least two kinds of dispersed particles, one of which is an electrically conductive microwave interactive carbon particle and the other of which is an electrically nonconductive suspended mineral attenuator particle for dissipating, spreading and modulating the energy received by the conductive particles. Of the two kinds of suspended particles, only the carbon particles interact with microwave energy directly. Both types of suspended particles remain dispersed in the ink vehicle until printed and cured. The printed lamina can include areas of solid coverage surrounded by peripheral areas of decreased coverage which include small open areas, i.e. unprinted openings, with larger size unprinted openings provided proceeding toward the periphery of the susceptor lamina.

Claims14

Dependent claims

A laminate for a food container to hold a food product to be heated in a microwave oven, comprising:

at least two supporting sheets of combustible dielectric material bonded together to form a laminate, at least one of said sheets serves as a susceptor substrate;
a layer of a microwave susceptor for producing heat when exposed to microwave energy;
said susceptor comprising a microwave inductive substance-containing ink layer including carbon particles dispersed in a fluid matrix comprising a dispersion of resinous particles as a binder material in a liquid and said resinous particles are adapted to form an organic film matrix upon drying to support the carbon particles and a microwave non-interactive mineral attenuator, said ink layer is printed onto the surface of one of the sheets and dried in a position for alignment with said food product;
at least one of the sheets comprising paper or paperboard;
whereby heat is transferred to the food product from the ink layer by conduction during heating in a microwave oven;
the microwave inductive substance-containing ink layer is encapsulated between the sheets and heat from the ink layer is transferred by conduction through one of the sheets to the food.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/511,840Filed 20 Apr 1990 · continuation
Priority: 24 Oct 1988
Granted: 29 Dec 1992
Term ends: Not estimatedThe source records don’t support an estimate.

Classification20 codes

B32B 27/18
Layered products comprising a layer of synthetic resin: characterised by the use of special additives
B65D 81/3446
For packaging foodstuffs or other articles intended to be cooked or heated within the package: specially adapted to be heated by microwaves
B65D 2581/344
Means for affecting the heating or cooking properties: geometry or shape factors influencing the microwave heating properties
B65D 2581/3447
Means for affecting the heating or cooking properties: heat attenuators, blocking agents or heat insulators for temperature control