Method of forming inner liner for tire and process for producing pneumatic tire

Abstract

A method of forming a tire innerliner and a method of producing a pneumatic tire according to the present invention suppresses occurrence of an air pocket and avoids complicating the structure of a tire building machine. The method of forming a tire innerliner is a method of forming a tire innerliner having a cylindrical inner rubber layer 3 and a cylindrical film 4 formed of a thermoplastic resin or a thermoplastic elastomer composition having a thermoplastic resin and an elastomer blended therewith, the cylindrical film 4 being disposed radially outwardly of the cylindrical inner rubber layer 3. The method comprises wrapping an unvulcanized rubber layer 3' cylindrically around a building drum 1 to form the cylindrical inner rubber layer 3 and wrapping a sheet-shaped film 4' formed of a thermoplastic resin or a thermoplastic elastomer composition having a thermoplastic resin and an elastomer blended therewith cylindrically around the cylindrical inner rubber layer 3 to form the cylindrical film 4. The method of producing a pneumatic tire uses the above method of forming a tire inner liner.

Description

technical field [0001] The present invention relates to a molding method of a tire innerliner and a method of manufacturing a pneumatic tire using the molding method. How tires are manufactured. Background technique [0002] There is known a pneumatic tire in which the inner liner disposed facing the tire cavity as an air permeation preventing layer is composed of a film layer made of thermoplastic resin or mixed with rubber instead of rubber in order to reduce the weight of the tire. A thermoplastic resin elastomer composition comprising a thermoplastic resin and an elastomer (for example, refer to Patent Document 1). [0003] In a pneumatic tire having an inner liner made of such a film layer, the inner liner is molded on an expandable and contractible building drum by externally forming a tubular film layer in advance on a building drum of a tire building machine (for example, Refer to Patent Document 2). Since the film layer is formed into a cylinder in advance, the f...

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Problems solved by technology

That is, the carcass layer is also attached to the film layer through the rubber layer (the rubber layer that ensures the joint with the carcass layer). There are recesses such as joints and threaded holes on the outer peripheral surface of the forming drum that fixes the film layer. When the rubber layer is attached to the film layer, the film layer is partially sunk into the recess due to its thinness, so there is a rubber in the recess position. The problem of easy formation of air pockets between layers and film layers

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