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Mold for tire

A mold and tire technology, applied in household appliances, other household appliances, tires, etc., can solve the problems of metal sheet sticking, defects, air residues, etc.

Inactive Publication Date: 2010-06-23
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, defects tend to occur at positions far from the split surface due to residual air
[0015] In molds with slits, adjustment of the slit width requires effort
In addition, since the mold is used repeatedly, there is a problem that the metal pieces that exist through the gap are closely attached to each other.
Insufficient escape of air in dies that produce snugness
Insufficient air removal can lead to defects

Method used

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  • Mold for tire
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] ready to have Figure 1 to Figure 6 shape mold. The die has a plurality of grooves having a rectangular cross section. The groove is formed by cutting the upper surface of the sheet with a laser beam. The pitch P of the grooves was 10 mm. The width W of each groove is 0.05 mm and the depth D is 0.05 mm.

Embodiment 2 to Embodiment 6

[0069] Dies of Examples 2 to 6 were obtained in the same manner as in Example 1 except that grooves having a depth D shown in Table 1 below were formed.

Embodiment 7 to Embodiment 10

[0071] In the same manner as in Example 1 except for forming a groove having a width W shown in Table 1 below, the molds of Examples 7 to 10 were obtained.

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PUM

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Abstract

The present invention provides a mold for tire, which causes hard generation of tire on tire and can be easily manufactured. A combined mold (4) is provided with a block (12) which is composed of a plurality of sheets (20). A plurality of grooves (30) are formed at an upper surface (26) of the sheets (20). The upper surface (26) is a coarse surface. The cross section of the each groove (30) is rectangular. One end of each groove (30) is exposed from a cavity surface. The grooves (30) extend along the radial direction of the mold. The other end of each groove (30) is exposed from the back surface of the sheet (20). The groove (30) has a depth in 0.01-0.10mm and a width in 0.01mm-0.10mm. The space between one groove (30) and another groove (30) adjacent with the groove (30) is 0.10mm-20mm. The air between the greentire and the cavity surface is discharged through the grooves (30) in a vulcanization step.

Description

technical field [0001] The present invention relates to a mold used in the vulcanization process of tires, and more specifically, the present invention relates to a mold having a gap for evacuating air. Background technique [0002] Molds are usually used in the vulcanization process of tires. Sheet molds and mold halves can be used in this vulcanization process. The preformed green tire is placed in a mold during the vulcanization process. The green tire is heated while being pressurized in a cavity surrounded by a mold and an air bag. The rubber composition of the raw tire flows in the cavity by pressurization and heating. Rubber is heated to produce a cross-linking reaction to obtain a tire. Once air remains between the cavity surface of the mold and the green tire when pressurized, defects will be formed on the surface of the tire. Defects degrade the quality of the tire. General molds have vent holes. Air is exhausted through the vent hole. [0003] The sheet mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C33/10B29C33/44B29D30/08
Inventor 衣畑启清水圭二高桥正规
Owner SUMITOMO RUBBER IND LTD