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:
Mar. 27, 1990
Filed:
Sep. 09, 1988
Siegfried Hopperdietzel, Selb, DE;
Rehau AG & Co., Rehau, DE;
Abstract
A method for manufacturing a blow-molded body employs a two-part blow-mold. A tubular preform is introduced, with the material in a thermoplastic state, into the opened blow-mold halves, and a reinforcing element is supported inside the preform by a displaceable holding device. During closing of the blow-mold halves, pressure is exerted on the wall regions of the preform that are adjacent to the reinforcing element. This pressure results in a reduced cross section of the preform wall in the region of the reinforcing element, and thermoplastic material is displaced. The interior of the preform is subjected to a blowing-pressure no later than when the pressure is applied from the exterior, and the blowing pressure causes the preform to inflate inside the mold. The displaced material anchors the reinforcing element inside the blow-molded body, and preferably forms bridges which extend across the blow-molded body and which cover the sides of the reinforcing element. The reinforcing element may also be provided with passages into which displaced material enters to form further bridges.