METHOD FOR MOLDING CYLINDRICAL RUBBER MEMBER

WIPO Patent Application WO/2013/157343

A1

Provided is a method for molding a cylindrical rubber member that keeps a constant width, and eliminates an unevenness at a junction to enable molding to a desired width over the full periphery. The present invention comprises: a preparation step for bringing a die (11) close to a molding drum (2); a winding start step for beginning rotation of the molding drum (2) simultaneously with beginning extrusion of a rubber (S), gradually increasing the extruded amount to a predetermined amount (Q1), and gradually increasing the distance of the die (11) from the molding drum (2) to a predetermined distance (D2) corresponding to the desired thickness of the cylindrical rubber member, thereby molding a winding start section (S1) having a wedge-shaped cross-section; a winding step for maintaining the extruded amount at the predetermined amount (Q1), maintaining the distance of the die (11) from the molding drum (2) at the predetermined distance (D2), and thereby winding the rubber (S); and a winding end step for gradually reducing the extruded amount from the predetermined amount (Q1) while the distance of the die (11) from the molding drum (2) remains at the predetermined distance (D2), thereby molding a winding end section (S2) having a wedge-shaped cross-section on the winding start section (S1).

KITAMURA TAKASHI (JP)

PCT/JP2013/057897

October 24, 2013

March 19, 2013

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TOYO TIRE & RUBBER CO (JP)

B29C48/37; B29C48/395; B29C48/585; B29C48/92; B29D30/30; B29L23/00; B29L30/00

JP2010234707A	2010-10-21
JP2011173369A	2011-09-08
JP2008023847A	2008-02-07

UNIUS PATENT ATTORNEYS OFFICE (JP)
Patent business corporation ユニアス international patent firm (JP)

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