Manufacturing method for pneumatic tyre, and pneumatic tyre
A technology for pneumatic tires and manufacturing methods, applied to the reinforcement layer of pneumatic tires, pneumatic tires, tire parts, etc., can solve the problems of tire uniformity reduction, large middle elongation, etc., to improve force changes and improve uniformity Effect of performance, durability improvement
Inactive Publication Date: 2015-04-22
SUMITOMO RUBBER IND LTD
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Problems solved by technology
Therefore, at the said position of the carcass ply k, a large change in the intermediate elongation occurs, and the uniformity of the tire may be reduced
Method used
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[0064] Manufactured using a rigid core with figure 1 Passenger tires of the construction shown (tire size 215 / 45R17) were tested for uniformity of each tire. Figure 10 (A) shows the application procedure of the carcass sheet of the comparative example. Figure 10 (B) shows the order of attaching the first and second carcass ply sheets in the example. Figure 10 (A) and Figure 10 The numerical values enclosed in (B) indicate the cutting order and attaching order of the carcass ply pieces. In the comparative example, the carcass sheets were continuously arranged in the tire circumferential direction in the order in which they were cut without providing a spacer. Common specifications and test methods for plies are as follows.
[0065]
[0066] Ply Width: 30mm
[0067] Ply thickness: 1.2mm
[0068] Number and diameter of carcass cord: rayon, 0.76mm
[0069] Number of carcass cords: 20
[0070]
[0071] The low-speed RFV of 50 samples of each tire was measured in ...
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Abstract
[Problem] To provide a manufacturing method for a pneumatic tyre (1), the method comprising a green tyre formation process in which an unvulcanized carcass ply (6A) is adhered to the outer surface of a rigid core (20). The green tyre formation process comprises: a step in which a plurality of rectangular-sheet-shaped first ply pieces (13) are continuously formed by sequentially cutting a long ribbon-shaped ply (12) from the tip, in the ply-width direction; a ply piece formation step in which a plurality of rectangular-sheet-shaped second ply pieces (14) are continuously formed; and carcass formation step in which the first and second ply pieces (13, 14) are used to form an unvulcanized carcass ply (6A). The second ply pieces (14) are arranged so as to not overlap with the first ply pieces (13) on the tyre equator (Co), and so as to directly overlap with the first ply pieces (13) at an inner end section (14i) in the radial direction of the second ply pieces (14).
Description
technical field [0001] The present invention relates to a method of manufacturing a pneumatic tire and a pneumatic tire having excellent uniformity. Background technique [0002] In recent years, a method of manufacturing a pneumatic tire for improving tire uniformity has been proposed. In this manufacturing method, for example, as Figure 11 As shown in (A), short carcass ply pieces b1 and Figure 11 (B) Rigid core d shown. [0003] The short carcass piece b1 is obtained by sequentially cutting the short carcass b in the carcass width direction. The belt-shaped carcass b has an array a of a plurality of carcass cords a1 aligned along its longitudinal direction, and a topping c covering the array a. The rigid core d has, for example, a profile close to the shape of the tire cavity of the finished tire. [0004] Such as Figure 11 As shown in (B), the carcass ply pieces b1 are continuously attached on the rigid core d at the same pitch in the tire circumferential direction...
Claims
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IPC IPC(8): B29D30/16B60C9/02B60C9/08B60C13/00B60C15/06B60C17/00
CPCB60C17/0009B29D30/12B29D30/16B29D2030/201B60C15/0018B60C9/023B60C2017/0054B60C2017/0063B29D30/165Y10T152/10495B29D30/0601B60C13/00B60C5/00
Inventor 杉山直树
Owner SUMITOMO RUBBER IND LTD