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1. (WO2014192585) METHOD FOR INCREASING INTERNAL PRESSURE OF HOLLOW BALL AND DEVICE THEREFOR

Pub. No.:    WO/2014/192585    International Application No.:    PCT/JP2014/063302
Publication Date: Fri Dec 05 00:59:59 CET 2014 International Filing Date: Wed May 21 01:59:59 CEST 2014
IPC: A63B 39/02
A63B 47/00
Applicants: DUNLOP SPORTS CO. LTD.
ダンロップスポーツ株式会社
Inventors: TAKIHARA Hironori
瀧原 広規
TANAKA Hiroaki
田中 聡明
Title: METHOD FOR INCREASING INTERNAL PRESSURE OF HOLLOW BALL AND DEVICE THEREFOR
Abstract:
[Problem] To provide a method for increasing internal pressure of a hollow ball easily in a practical time. [Solution] This method for increasing the internal pressure of a hollow ball comprises: (1) a step for putting, in a housing part (4), a hollow ball (18) having an outer shell and a space covered with the outer shell; (2) a step for filling, into the housing part (4), gas having more excellent permeability to the outer shell than the permeabilities of oxygen gas and nitrogen gas to the outer shell; and (3) a step for causing the gas to permeate the outer shell. When the outer shell contains natural rubber, preferably, gas of which the permeation coefficient to the natural rubber at 25°C is 20×10-17 m4/(N∙s) or more is filled into the housing part in the above step (2). More preferably, carbon dioxide gas is filled into the housing part in the above step (2).