Joining stiffening material to shoe upper using UHF field
AssigneeDeutsche Gold- und Silber-Scheideanstalt vormals Roessler
InventorsPaul Kremer, Bernhard Gora, Cornelis VAN Amsterdam
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Abstract
Formable or formed stiffening materials, especially for shoe capping, consisting of: at least one backing or layer of fibrous material and at least one thermoplastic synthetic resin, optionally containing fillers, plasticizers, dyes, pigments and/or stabilizers against light, heat and/or mechanical influences, which stiffening materials in a given case have an adhesive coating on one or both sides based on a thermoplastic synthetic resin, containing at least 3 parts of an active substance, e.g., carbon black, in 100 parts of thermoplastic synthetic resins.
Claims28
A method of joining (1) a stiffening material consisting essentially of a fibrous backing or layer having impregnated into said fibrous backing or layer, a thermoplastic synthetic resin stiffening material containing at least three parts per 100 percent of the thermoplastic synthetic resin of an active substance to produce quick and uniform dielectric heating which active substance is finely divided, homogeneously distributed in the stiffening material and is at least one member of the group consisting of carbon black and graphite to (2) an upper material of leather or synthetic resin which is devoid of such active substance without significantly heating the upper material comprising rapidly heating the stiffening material to the temperature at which it becomes soft and adhesive by subjecting the stiffening material and adjacent upper material to an ultra high frequency field.
The process of claim 11 wherein the stiffening material contains 10 to 30 parts of active substance per 100 parts of synthetic resin.
Dependencies are inferred from the claim text.