BEAD CORE, PRODUCTION METHOD THEREFOR, AND PNEUMATIC TIRE

Title:

BEAD CORE, PRODUCTION METHOD THEREFOR, AND PNEUMATIC TIRE

Document Type and Number:

WIPO Patent Application WO/2018/235507

Kind Code:

A1

Abstract:

This bead core is annular and comprises at least one bead wire wound a plurality of times therein. The cross-sectional shape of the bead wire is noncircular. In the axial direction cross-sectional view of the bead core, the bead wire has a plurality of columns formed in the axial direction of the bead core and a plurality of stages formed in the radial direction of the bead core. In the axial direction cross-sectional view of the bead core, the circumference of the bead wire is coated in a resin material and resin material is interposed between each bead wire. This bead core production method is for obtaining bead cores and comprises: a winding step in which at least one resin-coated wire is wound a plurality of times so as to form a plurality of columns in the axial direction and a plurality of stages in the radial direction, in the cross-sectional view in the axial direction of the obtained bead core, said resin-coated wire being one bead wire having a noncircular cross-section and being coated in a resin material; and a joining step in which resin material in resin-coated wire adjacent as a result of winding is joined. This pneumatic tire comprises a pair of bead sections and comprises the bead core in the pair of bead sections.

Inventors:

KON SEIJI (JP)
KOUNO YOSHIHIDE (JP)

Application Number:

PCT/JP2018/019717

Publication Date:

December 27, 2018

Filing Date:

May 22, 2018

Export Citation:

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Assignee:

BRIDGESTONE CORP (JP)

International Classes:

B29D30/48; B60C15/04

Domestic Patent References:

WO2013089111A1

2013-06-20

Foreign References:

JP2011131866A	2011-07-07
JP2005145082A	2005-06-09
JP2010274768A	2010-12-09
JP2014151839A	2014-08-25
JP2012179969A	2012-09-20
JP2009190552A	2009-08-27

Other References: