The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 02, 1976
Filed:
Jun. 18, 1975
Douglas L Hertel, Strongsville, OH (US);
Sidney E Rains, Medina, OH (US);
International Basic Economy Corporation, New York, NY (US);
Abstract
Vulcanization cycle times are substantially reduced in the injection molding of rubber compounds by forcing uncured, substantially unheated highly viscous rubber compounds through a thin flow channel upstream of the mold without supplying heat to the compound by conduction from an external source at any point prior to the mold. The compound is autogenously and quickly heated by the energy generated from the mechanical working of the compound under conditions of shear in the channel. The shearing action substantially reduces the compound's viscosity and increases its temperature above the critical residual scorch range as it passes through the channel. The downstream product is a rubber compound of significantly reduced viscosity having a substantially uniform temperature throughout, which is injected into a mold in a continuous flow and vulcanized.