Heating structure in the form of a sandwich and household electr

Details Heating structure in the form of a sandwich and household electr Heating structure in the form of a sandwich and household electr

1996-03-04

1998-07-07

Jeffery, John A.

Electric heating

Heating devices

Combined with pressure application means

219544, 219542, H05B 330, D06F 7508

Patent

active

057772975

ABSTRACT:
A heating structure in the form of a sandwich is composed of first and second external elements, each having a face which is directed toward the other element, with the first external element constituting a heating plate, and the heating structure further including a heating unit interposed between the first and second external elements. The heating unit includes at least one substantially flat resistive heat generating element; a first layer of thermoplastic resin in which the heat generating element is embedded; an upper electrical insulating sheet and a lower electrical insulating sheet between which the resistive heat generating element and the first layer of thermoplastic resin are interposed to form a sandwich structure, with the first layer of thermoplastic resin adhering to each of the electrical insulating sheets; and at least one second layer of thermoplastic resin contacting one of the external elements and adhering the one of the external elements to the heating unit. The heating unit further includes at least one further electrical insulating sheet contacting, and adhering to, the at least one second layer of thermoplastic resin; and an intermediate layer of adhesive material interposed between, and adhering to, one of the upper and lower electrical insulating sheets and the at least one further electrical insulating sheet.

REFERENCES:
patent: 1472185 (1923-10-01), Mollenhauer
patent: 4860434 (1989-08-01), Louison et al.
patent: 5100494 (1992-03-01), Schmidt

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