Heat-bonding method
AssigneeThe Dimension Weld International Corporation
InventorJoanne Burgheimer
Life of this patent
Estimating the term…
Abstract
Thermoplastic materials, such as polyvinylchoride, cannot normally be heat bonded to certain higher-melting synthetic fabrics, such as nylon or the like, which are of the densely woven type and are also frequently treated with silicone or analogous substances to make them water repellant and/or windproof. The present method overcomes this problem by heat-bonding such materials under pressure and the application of a dielectric field, and by causing sufficient dielectric resistance to be present at the synthetic fabric so that the dielectric field is able to heat the synthetic fabric to a temperature at which it becomes sufficiently flowable to bond with the thermoplastic material.
Claims12
A method of heat-bonding a layer of thermoplastic material onto a densely woven synthetic fabric which has a higher melting point than said thermoplastic material and is impenetrable to the latter even when said thermoplastic material is in flowable state, comprising the steps of forming an assembly from a layer of thermoplastic material and a juxtaposed densely woven synthetic fabric having a surface facing the thermoplastic material and another surface facing away therefrom, said fabric also having a higher melting point than said thermoplastic material and interstices which are impenetrable to said thermoplastic material even when the latter is in flowable state;
- subjecting said assembly to pressure in bonding zones in which said layer is to be bonded to said fabric;
- subjecting said assembly to a dielectric field so as to apply in said zones sufficient heat to said assembly to render said thermoplastic material flowable;
- and establishing adjacent said other surface of said synthetic fabric a dielectric resistance greater than the dielectric resistance of said synthetic fabric so as to cause heating of said synthetic fabric to an extent adequate to render the same sufficiently flowable in said zones to bond with said thermoplastic material.
Dependencies are inferred from the claim text.