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:
Sep. 18, 1990
Filed:
Jan. 17, 1989
Hidenori Kobayashi, Tokyo, JP;
Moriaki Suwabe, Tokyo, JP;
Nobuhiro Inakazu, Tokyo, JP;
Hatsuo Nagamatsu, Tokyo, JP;
Kamaya Kagaku Kogyo Co., Ltd., Tokyo, JP;
Abstract
A method for manufacturing a three-layered container by injection molding, the method consecutively including steps of: (a) preparing an injection molding apparatus having: an inner injector element having a tubular inner body and a flow path communicating with the inner inlet nozzle and an inner injection nozzle formed both ends of the body, respectively; and an outer injector element having a tubular outer body including an outer injection nozzle and an outer inlet nozzle, the outer injector element disposed to hold the inner injector element so that a tubular space is formed between the inner and the outer bodies, the inlet nozzle of the outer body communicating with a curved groove formed in the outer surface of the inner injector body; and the inner surface of the outer body and the outer surface of the inner body are in a form so that the thickness of the tubular space therebetween is smaller at a portion compared to other portions; (b) injecting a first resin from the outer injection nozzle; (c) injecting a second resin from the inner injection nozzle 0.0001-3.0 seconds after the end of the preceding step of injecting the first resin; and (d) injecting the first resin from the outer injection nozzle, 0.0001-1.0 second after the start of the precedent injecting the second resin.