Method and apparatus for injection-molding a thermoplastic device

  • US 5,656,226 A
  • Filed: 08/12/1996
  • Issued: 08/12/1997
  • Est. Priority Date: 03/06/1991
  • Status: Expired due to Term
First Claim
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1. A method of forming a device having at least one relatively rigid thermoplastic wall member intended to provide a function, said wall member having thereon flexible hooks adapted to be releasably attachable to at least one associated cooperative loop-bearing member, said method comprising:

  • injection molding said relatively rigid thermoplastic wall member in an injection mold, a portion of said mold having plurality of hook-shaped cavities to define a field of hooks integral with at least one pre-determined area of said injection molded wall member, said field of hooks having a length and a width, said field comprising hooks interspersed in both the length and the width of the field, the pre-determined area of said field of hooks being substantially less that the total area of said wall member and said mold portion being in unitary assembly during said injection molding step, andremoving said wall member from said mold with said mold portion maintained in said unitary assembly, such that said removed injection molded wall member has said field of hooks integrally formed thereon.

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