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:
Jul. 02, 1991
Filed:
Jan. 18, 1990
Applicant:
Inventors:
Yoshiya Taniguchi, Kako, JP;
Akio Yamada, Akashi, JP;
Assignee:
Toyo Machinery & Metal Co., Ltd., Hyogo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ;
U.S. Cl.
CPC ...
2643281 ; 26432817 ; 264349 ; 425207 ; 425587 ; 366 78 ;
Abstract
In an injection unit of an in-line screw type injection molding machine, a screw is provided rotatably in both normal and reverse directions within a heating cylinder. The screw is periodically reversed in a charging stroke with the period of normal rotation being longer than that of reverse rotation, whereby a resin material is kneaded and plasticized. As a result, the resin in a melting and pooling zone (flow zone) between the inner wall of the heating cylinder and the outer peripheral wall of the screw is effectively moved back and forth and hence plasticized and molten into a uniform molten resin.