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Mold for rubber extrusion molding, rubber part for tire molding, and method for manufacturing rubber part for tire molding

A rubber extrusion molding and tire molding technology, which is applied in the field of rubber extrusion molding molds, can solve problems such as insufficient distance, unstable interface state, and poor surface roughness.

Active Publication Date: 2018-05-18
TOYO TIRE & RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, even if it is any of the above rubber extrusion molding dies, its structure cannot ensure a sufficient distance when different types of rubbers are merged.
Therefore, there may be a problem that air enters the interface between the rubbers to destabilize the interface state (deterioration of surface roughness)

Method used

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  • Mold for rubber extrusion molding, rubber part for tire molding, and method for manufacturing rubber part for tire molding
  • Mold for rubber extrusion molding, rubber part for tire molding, and method for manufacturing rubber part for tire molding
  • Mold for rubber extrusion molding, rubber part for tire molding, and method for manufacturing rubber part for tire molding

Examples

Experimental program
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Effect test

Embodiment 1

[0061] The structure of embodiment 1 is that the length of the bottom surface 8c (shelf) of the first confluence channel 8 is set to 1 / 5 of the length of the front mold, and a guide surface is formed on the bottom surface 8c (shelf) of the first confluence channel 8. The upper face 8a presses the second rubber from above.

Embodiment 2

[0062] The structure of embodiment 2 is that the length of the bottom surface 8c (shelf) of the first confluence channel 8 is set to 4 / 5 of the length of the front mold.

Embodiment 3

[0063] The structure of embodiment 3 is that the length of the bottom surface 8c (shelf) of the first confluence channel 8 is set to 4 / 5 of the length of the front mold, and a guide surface is formed on the bottom surface 8c (shelf) of the first confluence channel 8 .

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Abstract

PROBLEM TO BE SOLVED: To stabilize the state of boundary surfaces between two or more rubbers by preventing air inclusion between rubber layers effectively in integrating the rubbers and extrusion-molding the rubbers.SOLUTION: A die for rubber extrusion molding includes a pre-die 2 having a confluent part 8 in which two or more rubbers are joined and a nozzle 4 which discharges the rubbers joined in the pre-die 2, and the pre-die 2 is provided with a passage for supplying a second rubber 11 constituting the lower surface of a molding from below to a first rubber 10 flowing in the horizontal direction.

Description

technical field [0001] The present invention relates to a die for rubber extrusion molding, a rubber part for tire molding, and a method for manufacturing the rubber part for tire molding. Background technique [0002] Conventionally, as a die for rubber extrusion molding, for example, the following structures are known. [0003] Patent Document 1 discloses an extrusion head having a die, a rear die, and an integral composite unvulcanized rubber forming device. [0004] Patent Document 2 discloses an extrusion head including a pre-former (pre-former) for preforming rubber and a die plate disposed adjacent to the downstream side of the pre-former. [0005] However, even in any of the aforementioned dies for rubber extrusion molding, the structure cannot ensure a sufficient distance for the case where different types of rubbers are merged. Therefore, there may be a problem that air enters the interface between the rubbers to destabilize the state of the interface (deteriorat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C47/12B29C48/30
CPCB29C48/30B29C48/304
Inventor 一柳友洋
Owner TOYO TIRE & RUBBER CO LTD
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