Manufacturing method of pneumatic tire
A technology for pneumatic tires and manufacturing methods, which can be applied to tires, other household appliances, household appliances, etc., and can solve the problems of reduced airtightness of tires, etc.
Inactive Publication Date: 2015-09-16
SUMITOMO RUBBER IND LTD
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
Therefore, if Figure 7 As shown in (B), part of the above-mentioned overlapping portion J pushes away the above-mentioned inner liner rubber E and is exposed to the inner surface of the tire, so that the airtightness of the tire decreases.
Method used
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Embodiment
[0043] Using a rigid core body and based on the specifications in Table 1, a prototype with figure 1 Car tires of the structure shown (tire size 175 / 65R14) were used, and the occurrence rate of the overlapping portion exposed to the inner surface of the tire and the uniformity of the tire were tested.
[0044] Among them, the conventional example is formed by a conventional general manufacturing method having an expansion process in which a single carcass ply is placed on a cylindrical forming drum without using a rigid core. A process in which the tubular carcass cord is wound once in the circumferential direction to form a tubular carcass cord, and the tubular carcass cord is expanded between bead cores and shaped into a ring shape. Both comparative examples and examples use rigid core bodies.
[0045] Except for the description in Table 1, the specifications are substantially the same.
[0046] strip curtain
[0047] ·Circumferential width L1---20mm,
[0048] ·Number o...
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Abstract
The invention discloses a method for manufacturing a pneumatic tire. Concave and convex portions on the external surface of the side portion of a tire are prevented from deformation, so that the appearance quality of the tire is improved. The method includes a tire forming process. A plurality of long curtain cloth sheets are successively bonded on a rigid core body along the circumference of the tire so that an annular tire body is formed, wherein the long curtain cloth sheets are formed through covering by sticking glue along the array body of a tire body cord aligned with the tire axially. The side edges of every adjacent long curtain cloth sheet are close to each other or mutually connected on the surface of the tire body without being overlapped, and the side portions of the tire body are equipped with overlapping portions for overlapping of the above side edges. The modulus of an external tire body cord arranged on the outside is set by the array body of the tire body cord to be smaller than the modulus of an internal tire body cord arranged on the inner side of the external tire body cord.
Description
technical field [0001] The present invention relates to a method of manufacturing a pneumatic tire including a carcass forming step of forming a ring-shaped carcass by affixing strip-shaped carcass sequentially to a rigid core in the tire circumferential direction. process. Background technique [0002] In recent years, in order to improve the uniformity of tires, for example, a manufacturing method has been proposed in which a rigid core body having an outer shape similar to that of the tire inner cavity of a finished tire is used, and the Various tire constituting members such as cords are sequentially attached to this rigid core body to form an unvulcanized tire, and this unvulcanized tire is put into a vulcanization mold together with the above-mentioned rigid core body, so that the tire is placed in the inner mold. The vulcanization molding is carried out between the rigid core body and the vulcanization mold as the outer mold. [0003] In the case of this manufacturi...
Claims
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IPC IPC(8): B29D30/16
CPCB29C65/54B29D30/38B29D2030/381
Inventor 中田典克
Owner SUMITOMO RUBBER IND LTD