Method and apparatus for fabricating a seamless hollow rubber co

Details Method and apparatus for fabricating a seamless hollow rubber co Method and apparatus for fabricating a seamless hollow rubber co

1990-10-15

1991-11-05

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156155, 156245, 156292, 156500, 273 58B, 273 58J, 273 61C, B29C 3552

Patent

active

050629123

ABSTRACT:
A seamless hollow rubber core for a tennis ball is formed within a spherical cavity of a mold, wherein the spherical cavity has a diameter commensurate with the outside diameter of the core. A spherical surface is formed from a material which has a melting temperature above the curing temperature of the rubber compound used for the core. The spherical surface is dimensioned commensurately with the inside diameter of a core. The spherical surface is then mounted within the mold concentrically with the spherical cavity. Unsured rubber core preforms are placed about the spherical surface in intimate contact with the spherical cavity. The core performs are then heated to a curing temperature. During the curing process, the preforms meld to form the seamless core. The core just formed is then heated to the melting temperature of the material of the spherical surface so that the spherical surface melts thereby leaving molten within the core. The molten material may then be removed from the inside of the core such as by draining it through a small orifice formed therein.

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