Patent ID: 6435201
Filing Date: 2002-08-20
Classification: B29C,Y10S,Y10T

Abstract:
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 screw channels of the plasticizing and injection screw to a region of 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 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; the outside part having at least two melt lines, which are not connected to one another, and the basic body having at least one melt line, such that the melt lines, of which there are at least two, of the outside part, 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.