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Process for making a game ball

  • US 4,187,134 A
  • Filed: 04/11/1978
  • Issued: 02/05/1980
  • Est. Priority Date: 04/13/1977
  • Status: Expired due to Term
First Claim
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1. A process for making a molded game ball which comprises,(a) wrapping a layer of fibrous material around an inflated rubber bladder to form an inner body having a configuration corresponding to that of said bladder,(b) applying a rubber sheet having a thickness of between 0.4 to 1.5 mm around said inner body, said rubber sheet comprising a rubber composition containing from 2.7 to 3.6 percent by weight of a first accelerating agent and from 0.2 to 0.4 percent by weight of isobutylidene-bis-4,6-dimethylphenol, said weight percentages based on the weight of the rubber composition,(c) imprinting the applied rubber sheet with a pattern to serve as a guide for subsequent application of outer cover segments,(d) subsequently applying a plurality of discrete cover segments to said rubber sheet conforming to said pattern, the peripheral edges of all of said cover segments being slightly spaced one from another, thereby forming a series of grooves on the semi-finished game ball,(e) pressing the semi-finished game ball in a smooth mold for a period of from 1.5 to 10 minutes at temperatures ranging between 90°

  • and 150°

    C., vulcanizing, plasticizing, and causing a portion of said rubber composition to flow into and substantially fill said series of grooves and to affect additional binding of said cover segments, and(f) thereafter cooling the game ball so produced.

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