Method of joining stiffening material to shoe upper using ultra high frequency radiation
AssigneeDeutsche Gold- und Silber-Scheideanstalt vormals Roessler
InventorsPaul A. Kremer, Bernhard N. Gora
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Abstract
Formable or formed stiffening materials are prepared which are dry and free of fibrous materials and consisting essentially of a thermoplastic synthetic resin containing at least 3 parts of an active substance, preferably carbon black in 100 parts of the resin. Optionally, there are present conventional fillers, plasticizers, dyes, pigments and/or stabilizers against light, heat and/or mechanical influences.
Claims6
A method of joining a stiffening material consisting essentially of a thermoplastic synthetic resin stiffening agent containing homogeneously dispersed therein 3 to 50 parts per 100 parts of the synthetic resin of carbon black or graphite as an active substance to a shoe upper material of leather or synthetic resin which is devoid of such active substance without significantly heating the shoe upper material comprising heating the stiffening material to the temperature at which it becomes soft and adhesive by subjecting the stiffening material and adjacent shoe upper material to ultra high frequency radiation for about 2 to 15 seconds.
Dependencies are inferred from the claim text.