Pneumatic tire and process for producing the same

Abstract

Provided are: a pneumatic tire capable of retaining a satisfactory uniformity even though the tire includes film layers superposed by winding a film layer in a circumferential direction of the tire multiple times; and a process for producing the same. The present invention is the pneumatic tire including the film layers of the thermoplastic resin or the thermoplastic elastomer composition made by blending the elastomer with the thermoplastic resin, which are superposed by winding the film layer in the circumferential direction of the tire multiple times, the tire wherein a rubber film is interposed between the film layers. The process for producing the pneumatic tire includes: preparing a laminated body in which the rubber layer is stuck to at least one surface of the film layer; interposing the rubber layer between the film layers by winding the laminated body in the circumferential direction of the tire multiple times; forming an uncured tire which includes the film layers and the rubber layers; and curing the tire.

Description

TECHNICAL FIELD[0001]The present invention relates to a pneumatic tire which includes a film layer of a thermoplastic resin or a thermoplastic elastomer composition obtained by blending an elastomer with a thermoplastic resin, and to a process for producing the same. More specifically, the present invention relates to a pneumatic tire which is capable of retaining a satisfactory uniformity even though film layers are superposed by winding a film layer multiple times in a circumferential direction of the tire, and to a process for producing the same.BACKGROUND ART[0002]Recent years, proposals have been made on a pneumatic tire in which a film layer of a thermoplastic resin or a thermoplastic elastomer composition obtained by blending an elastomer with a thermoplastic resin is placed as an air-permeation preventive layer on an inner surface of the tire (see Patent Document 1 and Patent Document 2, for instance).[0003]In a case where a pneumatic tire including such a film layer is requ...

AI Technical Summary

Benefits of technology

[0008]In the present invention, when film layers of a thermoplastic resin or a thermoplastic elastomer composition are superposed on one another by winding a film layer in the circumferential direction of the tire multiple times, a rubber layer is interposed between the film layers. This makes a tacking force between the film layers uniform, and inhibits a stick-slip phenomenon from occurring between the film layers, thereby allowing an uncured tire to be expanded evenly. Accordingly, the pneumatic tire is capable of retaining a satisfactory uniformity even when the film layers which are superposed by winding the film layer in the circumferential direction of the tire multiple times.

[0009]It is desirable that the manufacturing of the pneumatic tire according to the present invention be achieved by: preparing a laminated body obtained by sticking a rubber layer to at least one surface of a film layer; interposing the rubber layer between the film layers by winding the laminated body in a circumferential direction of the tire multiple times; and forming an uncured tire which includes the film layers and the rubber layers. In this case, the rubber film can be easily inserted between the film layers.

[0010]In the present invention, the film layer can be used as one of the various component members of a tire. Nevertheless, it is desirable that the film layer should constitute an air-permeation preventive film placed closer to an inner-cavity of the tire than a carcass layer is. In this case, the tire can exhibit a satisfactory capability of preventing air permeation owing to the superposed film layers.

Problems solved by technology

This is because, if the capability of preventing air permeation is enhanced through making a single film layer thicker, the rigidity of the thicker film layer becomes too high, and a tire making process accordingly becomes difficult.

However, when film layers are superposed on one another by winding a film layer in the circumferential direction of a tire multiple times, an interlayer tacking force (bonding force) between the film layers tends to be uneven at different locations due to, for instance, air remaining between the film layers.

For this reason, when the film layers are superposed by winding a film layer in the circumferential direction of the tire multiple times, it is difficult to expand an uncured tire evenly.

Furthermore, in a case where the uncured tire is expanded unevenly due to the superposed film layers, the uneven expansion adversely affects the casing structure including a carcass layer and belt layers, and thus causes a problem of deteriorating the uniformity of the tire.

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