Manufacturing method of pneumatic tire

A manufacturing method and technology for pneumatic tires, which are applied to tires, other household appliances, household appliances, etc., can solve the problems of increased contact resistance, reduced tire quality, uneven thickness, etc., so as to slow down thickness changes, improve tire quality, and protrude inhibiting effect

Active Publication Date: 2018-05-18
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this case, there is a problem that the convex portion C or the like is generated due to the margin ΔW2 of the overlapping amount, resulting in uneven thickness, resulting in a decrease in tire quality.
However, in the case of reducing the angle α to the above-mentioned range, there arises a new problem to be solved in that the contact resistance between the cutting edge and the rubber member increases, causing confusion in the cut, or causing the rubber to not be cut off at a later stage of cutting. but poor cutting such as shredding

Method used

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  • Manufacturing method of pneumatic tire
  • Manufacturing method of pneumatic tire
  • Manufacturing method of pneumatic tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0042] use figure 1 , Figure 6 ~ Figure 9 The device shown is based on the manufacturing method of the present invention to form a green tire for cars with a tire size of 205 / 60R16. Furthermore, for each test tire, the uniformity of the joint portion of the side rubber (tire constituent member) was measured. The specifications for joining the sidewall rubber are shown in Table 1. Except for the specifications described in Table 1, the other specifications are substantially the same, and the overlap margin ΔW2 of the joint portion of each tire is also set to be the same.

[0043] (1) Uniformity of joint

[0044] Five green tires were each formed, and as shown in FIG. 5 , the maximum value of the protrusion amount H of the raised portion C of the joint portion A of the side rubber was measured and evaluated based on the average value. The smaller the value, the more excellent the uniformity of thickness.

[0045] [Table 1]

[0046]

[0047] As shown in the table, it ca...

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Abstract

The present invention relates to a method of manufacturing a pneumatic tire, which can improve tire quality by reducing variation in the thickness of the joined portion when joining both end portions of a belt-shaped rubber member to form a ring-shaped tire component. Including a joining step in which the cut surfaces ( S1 ) of a belt-shaped rubber member ( 1 ) having cut surfaces ( S1 ) at both ends in the longitudinal direction are overlapped with each other and joined to make the tire The constituent parts are formed in a ring shape. The cut surface (S1) is constituted by an inclined surface (11), and the intersection angle (α) between the inclined surface (11) and the bottom surface (S2) of the belt-shaped rubber member (1) is in the range of 10° to 18°. Cutting is performed by moving the cutting blade (6) in parallel in a traveling direction (K) inclined at an angle (β) with respect to the width direction line (x) on the inclined surface (11).

Description

technical field [0001] The present invention relates to a method of manufacturing a pneumatic tire capable of reducing variation in thickness of the joined portion and improving tire quality when joining both end portions of a belt-shaped rubber member to form a ring-shaped tire component. Background technique [0002] In the manufacturing process of raw tires, for example, when forming tire components such as sidewall rubber and tread rubber into a ring shape, a belt-shaped rubber member having cut surfaces at both ends in the longitudinal direction is placed on a drum. After being wound up once, the cut surfaces are overlapped and joined (for example, refer to Patent Document 1). At this time, as shown in Fig. 10(A) and Fig. 10(B), in order to increase the joint strength at the joint part A, the cut surface bs at both ends of the belt-shaped rubber member b is set at an angle of, for example, 35 degrees to 60 degrees with respect to the bottom surface. The angle α is incl...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B29D30/20
Inventor铃木隆太福永秀一木之前秀和
OwnerSUMITOMO RUBBER IND LTD