Abstract An electric heating device for heating foam products as they are discharged from an aerosol container by passing the foam in direct contact with the hot surfaces of the secondary winding of a stepdown transformer. The device includes a housing having an inlet admitting pressurized foam from the aerosol container and an outlet for discharge of unpressurized foam. A toroidal shell mounted in the housing forms an annular flow path between the inlet to the outlet. The stepdown transformer includes a multiturn primary wound about the outer surface of the shell and a cylindrical iron core centered within the shell and a singleturn closed secondary winding that is formed by a thin plating of cadmium or copper on the core.
The electrical heating device of claim 1, in which the chamber confines the flow of foam to a thin, wide sheet.
Claim 2
Dependent Claim
17 words
The electrical heating device of claim 1, wherein the flow-confining means is constructed of electrically nonconductive material.
Claim 3
Dependent Claim
37 words
The electrical heating device of claim 3, wherein the primary circuit is a multiturn primary winding wound about the outside of the chamber and the secondary circuit is a single-turn electrically conductive metallic coating on the core.
Claim 4
Dependent Claim
16 words
The heating device of claim 4, wherein the chamber is toroidal and the core is cylindrical.
Claim 5
Dependent Claim
27 words
The heating device of claim 4, wherein the core is of iron and the secondary circuit is a thin copper plating on the surface of the core.
Claim 6
Dependent Claim
35 words
The heating device of claim 1, which includes control means electrically connected between a supply of electrical energy and the primary circuit of the transformer to control the flow of electrical energy to the transformer.