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. 29, 1994
Filed:
Nov. 04, 1992
Toshiji Yoshida, Kanagawa, JP;
Hideaki Fukuda, Kanagawa, JP;
Toshio Kagitani, Kanagawa, JP;
Keiji Fukuhara, Hiroshima, JP;
The Japan Steel Works, Ltd., Tokyo, JP;
Mazda Motor Corporation, Hiroshima, JP;
Abstract
A multilayer parison extruder includes a cylinder; an annular piston movably fitted in the cylinder; a material accumulation chamber in which the piston is moved; a material conduction chamber communicating with the accumulation chamber; an annular multilayer head provided in the conduction chamber; and a die slot provided under the conduction chamber. The extruder further includes a main material extruder for supplying a main material to the accumulation chamber; and auxiliary material extruders for supplying the auxiliary materials to the multilayer head. The extruder is characterized in that pairs of opposed feed ports are provided in the multilayer head and communicate with the auxiliary material extruders. At least one pair of the inlet ports is provided for each of a pair of arc-shaped passages which are for the auxiliary materials. The arc-shaped passages are connected to the feed ports so that each of the arc-shaped passages extends in opposite directions by nearly equal distances from the corresponding feed ports along the circumference of the multilayer head.