Rubber extruder and method for producing rubber extrudate

Abstract

Provided are a rubber extruder capable of suppressing unintended curvature of the rubber extrudate and a method for producing a rubber extrudate. A rubber extrudate R2 of a desired shape having less curvature d with respect to the extrusion direction is produced by placing a die 5 attached to a head 4 of a rubber extruder 1 at a front end position of an extrusion flow path 4a, moving the die 5 atleast monoaxially relative to the head 4 along the front end surface of the head 4 to bring the die 5 and head 4 into desired relative positions, and feeding unvulcanized rubber R1 obtained by mixingand kneading while extruding a rubber material R forward via a screw 3 provided within a cylinder 2 to the extrusion flow path 4a and extruding the fed rubber R1 from an extrusion port 6 formed in thedie 5.

Description

technical field [0001] The present invention relates to a rubber extruder and a method for producing a rubber extrudate, and more specifically, to a rubber extruder and a method for producing a rubber extrudate capable of suppressing unexpected bending of the rubber extrudate. Background technique [0002] When manufacturing rubber products such as tires, there is an extrusion process in which unvulcanized rubber is extruded by a rubber extruder. In the rubber extruder, the unvulcanized rubber is plasticized by a built-in screw, and sent to the extrusion flow path of the head formed at the front end. A die head (Japanese: 口金) having an extrusion port of a desired shape is provided at the front end of the head, and a rubber extrudate shaped into a desired shape is produced by making unvulcanized rubber pass through the extrusion port (for example, refer to patent Literature 1, 2). [0003] If the type of rubber is different, the physical properties of the rubber are also di...

AI Technical Summary

Problems solved by technology

In addition, there are variations in extrusion conditions, etc. for each batch

Due to these deviations, even when extruding unvulcanized rubber using the same die, sometimes the rubber extrudate is bent in an unexpected direction with respect to the extrusion direction, and the desired shape of the rubber extrudate cannot be obtained

In such a case, additional man-hours are required each time to correct the shape of the inner side of the die or adjust the extrusion conditions, etc.

Images