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:
May. 10, 1994
Filed:
Aug. 10, 1992
Syunji Yamamoto, Hiratsuka, JP;
Takaaki Kemmotsu, Hiratsuka, JP;
Mitsunori Okada, Yokohama, JP;
Makoto Hashimoto, Ayase, JP;
Furukawa Electric Co., Ltd., Tokyo, JP;
Abstract
There are provided a method and an apparatus for continuously manufacturing a cross-linked thermoplastic resin foam arranged as follows. A resin composition, which contains at least a thermoplastic resin, a foaming agent, and a cross-linking agent, is extruded into a closed die, which includes at least a molding region, a heating region, and a cooling region, continuously arranged in the order named. The resin composition is molded into a desired shape in the molding region of the die, and is then heated in the heating region to decompose the cross-linking agent and also to decompose at least part of the foaming agent so that cell nuclei are produced, thereby forming a partially foamed product. In the cooling region of the die, the partially foamed product is cooled to a temperature lower than the softening point thereof to be increased in rigidity, and is extruded to the outside of the die while being subjected to a damping force as it moves in the cooling region. The partially foamed product, extruded from the die, is heated under the atmospheric pressure to expand the foaming agent fully, whereupon a final product is obtained.