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:
Feb. 03, 2015
Filed:
Jan. 26, 2010
Tazuru Okamoto, Kyoto, JP;
Hirotsugu Yoshida, Kyoto, JP;
Yasuhiro Koike, Yokohama, JP;
Sekisui Chemical Co., Ltd., Osaka, JP;
Keio University, Tokyo, JP;
Abstract
The invention provides an extrusion material supply device suitable for use in melt extrusion molding, and a method for manufacturing an optical transmission body, in which a deterioration of an optical signal transmission loss is extremely small, and productivity intrinsic to an extrusion molding method is provided in combination. An extrusion material supply deviceincludes: a vertical hopper, which has a cooling unitand a heat melting unitcontinuous with a lower portion thereof, and houses a material rod R; cooling meansfor cooling the cooling unit; an electric heaterthat heats the heat melting unit; and gas pressurizing meansfor sequentially supplying molten plastics M to a metal die by a gas pressure. The heat melting unitis formed into a cylinder shape in which an inner diameter is larger than an inner diameter of the cooling unitarranged above, and enables the molten plastics M to spread in the heat melting unit. A portion between an outer circumference of the material rod R and an outer circumference of the molten plastics M is defined as an annular gas pressurizing surface