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:
Aug. 20, 2002
Filed:
Dec. 05, 2000
Johann Holzschuh, Meinerzhagen, DE;
Battenfeld GmbH, Meinerzhagen, DE;
Abstract
The invention relates to a non-return valve, which is situated at the end of a plasticizing and injection screw to control the flow of plastic melt from the region of the screw channels of the plasticizing and injection screw to the region of the space in front of the screw of a preplasticizing cylinder, where the plasticizing and injection screw is situated, the non-return valve having a basic body, which is rigidly connected to the plasticizing and injection screw, and an outside part, which can move translationally and preferably also rotationally relative to the basic body, so as to allow the flow of plastic melt in a first position and block the flow of plastic melt in a second position. To improve the locking behavior of the non-return valve and to simplify its structure, the outside part has at least two melt lines, which are not connected to one another, and the basic body has at least one melt line, such that the melt lines, of which there are at least two, of the outside body, together with the melt line of the basic body, in the first position jointly form a fluidic connection between the region of the screw channels and the region of the space before the screw, and such that the fluidic connection between the region of the screw channels and the region of the space before the screw is interrupted in the second position by a region of the basic body.