Rigid core for tire formation and tire manufacturing method using the same

A rigid core and tire molding technology, applied in tires, applications, household appliances, etc., can solve the problems of reduced production efficiency, longer disassembly and removal time of the core body, etc., and achieve the effect of improving production efficiency

Active Publication Date: 2019-02-12
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this case, it takes a long time to remove and take out the core body as a whole, which leads to a decrease in production efficiency.

Method used

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  • Rigid core for tire formation and tire manufacturing method using the same
  • Rigid core for tire formation and tire manufacturing method using the same
  • Rigid core for tire formation and tire manufacturing method using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0048] In order to confirm the effect of the present invention, a pneumatic tire (245 / 40R18 ). In addition, the moldability of the green tire when forming a green tire, the removability of the core segment from the vulcanized tire, and the durability of the coating layer were examined and evaluated.

[0049] In Table 2, the rubber release properties and hardness of the coating layer described in Table 1 are represented by indices. Rubber release properties are based on the above Figure 6 The peeling detection was evaluated on a 5-point scale by the operator's senses. When the numerical value is large, the release property is excellent. In addition, regarding the hardness of the coating layer, a value measured in accordance with the "micro Vickers hardness test" described in the "Vickers hardness test-test method" of JIS Z 2244 was indexed.

[0050] (1) Green tire formability:

[0051] On the tire molding surface S of the core main body, an unvulcanized strip-shaped rubbe...

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Abstract

In an inner mold method, a pull-out force of extracting inner mold segments from a vulcanized tire is reduced. A rigid inner mold 1 is provided with an annular inner mold body 2 having a ti re molding surface S. A rigid core 1 is put into a vulcanization mold B for each green tire T formed on the tire molding surface S, whereby the green tire T is vulcanization-molded between the vulcanization mold B and the inner mold body 2. The inner mold body 2 comprises a plurality of inner mold segments 5 divided in the circumferential direction. A coating layer 11 having rubber release property is formed on the tire molding surface S.

Description

technical field [0001] The present invention relates to a rigid core for forming a tire that can reduce the force of pulling out a core segment from a vulcanized tire in a core construction method and can accelerate the removal and removal of the core body, and a method for manufacturing a tire using the same . Background technique [0002] In recent years, in order to improve tire forming accuracy, a tire manufacturing method using a rigid core (hereinafter sometimes referred to as "core method") has been proposed (for example, see Patent Documents 1 and 2). The rigid core includes a core body having an outer shape conforming to the shape of the tire inner surface of the vulcanized tire, and the green tire is formed by sequentially affixing tire constituent members to the core body. And, by putting the green tire together with the rigid core into the vulcanization mold, the green tire can be vulcanized and molded with the core body as the inner mold and the vulcanization m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C33/02B29C35/02B29D30/12B29K21/00B29K105/24B29L30/00
CPCB29D30/0661B29D30/12B29C33/56B29C33/62
Inventor 小原圭
Owner SUMITOMO RUBBER IND LTD
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