Electric heating – Metal heating – Of cylinders
Patent
1992-05-15
1993-10-12
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 1055F, 426107, 426234, 426110, 99DIG14, 229903, H05B 680
Patent
active
052527930
DESCRIPTION:
BRIEF SUMMARY
This invention relates to packaging containers for use in connection with the microwave heating of foodstuffs.
It is known to provide in a packaging container which is otherwise transparent to microwave energy, a microwave interactive or receptor, material which heats up when subjected to the microwave radiation. The heating up of the receptor material serves to heat adjacent foodstuff, for the crisping or browning of same, it being a disadvantage of conventional microwave heating that although the foodstuff will heat up quickly and effectively under the influence of microwaves, it is not possible to obtain a crisping or browning effect and that certain products such as pizzas and chipped potatoes simply become hot and soft, and rather unpalatable.
The said receptor materials however overcome this disadvantage, in that said materials quickly heat up under the influence of the microwaves to a high temperature and heat from the receptor materials is transferred by conduction to the foodstuff.
Examples of receptor materials and their methods of manufacture and use are disclosed in the following published patent specifications:
A specific known packaging container for use in connection with microwave heating of foodstuffs comprises a box constructed of cut and creased material, specifically cardboard, and inside the container and resting on a base thereof, is provided a sheet of receptor material. The foodstuff , chipped potatoes rest on the receptor material and for the cooking of the foodstuff, the lid or a panel in the lid is moved to an open position, and the container is simply placed in a microwave oven and the assembly subjected to microwave energy. Whilst such packaging is sufficiently satisfactory to be commercial, if the package rests on a part of the oven which acts as a heat sink and conducts away heat from the receptor material, the foodstuff takes longer to heat up than it should.
To some extent this effect can be reduced if an air space can be created between the receptor material and the microwave oven support surface (support table) on which the package stands.
Several attempts have been made to overcome this difficulty, and in one suggested arrangement, where a packaging container includes a receptor layer and a pizza resting thereon, the pizza and receptor material are removed, and the container is turned upside down and then the receptor material and pizza are placed on the underside of the base of the container. Another proposal provides that one portion of the container when the container is opened is folded back to form a support to keep the remainder of the container which supports the product on the receptor material clear of the microwave oven table.
These arrangements have a certain inconvenience because they require a degree of manipulation on the part of the user, and if the user forgets to perform such manipulation, then unsatisfactory cooking may result.
The present invention seeks to deal with this problem from a different approach, and in accordance with the invention, there is provided a packaging container of cut and creased material containing a foodstuff or for containing a foodstuff to be microwaved, wherein the container is constructed so as to provide a platform forming the base of the container on which the product rests and when placed in a microwave oven, said platform being spaced from a support surface or edge defined by the container so that the platform will be kept clear of the microwave table during microwaving of the product, which is achieved by simply placing the container and its contents, with the lid open or removed as required, directly into the microwave oven, said platform comprising or including a layer of microwave receptor material.
By the present invention, the container is constructed so that there is created within same a platform spaced from a support edge or surface so that the container and its contents can be simply placed directly in the microwave oven with the support surface or lodge resting on the microwave oven table. The user is therefor
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Leung Philip H.
Waddington Cartons Limited
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