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Strip material for forming flexible backed fasteners

  • US 4,216,257 A
  • Filed: 04/20/1979
  • Issued: 08/05/1980
  • Est. Priority Date: 04/20/1979
  • Status: Expired due to Term
First Claim
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1. In a strip material which may be severed into at least two lengths to form portions of a fastener, said strip material comprising a flexible nonoriented polymeric bonding layer having an exposed major surface;

  • a multiplicity of flexible, resilient, generally U-shaped monofilaments of longitudinally oriented polymeric material, each including a central bight portion embedded in the bonding layers and two stem portions extending from the opposite ends of said bight portion and projecting generally normal to said exposed major surface of the surface bonding layer; and

    enlarged generally circular heads at the ends of said stem portions opposite said bight portion, each of the heads having a semispherical cam surface opposite its supporting stem portion adapted for engagement with the cam surfaces of heads along a different portion of the strip material to produce deflection of the stem portions and movement of the heads on the stem portion past each other, and having a latching surface opposite said cam surface which latching surface is generally planar, extends at generally a right angle radially from its supporting stem portion, and is adapted to engage a similar latching surface on another head;

    the bight portions of said U-shaped monofilaments being disposed to afford movement of the heads along different portions of the strip material past and into releasable engagement with each other;

    the improvement wherein said strip material further includes a layer less than about 0.16 centimeter thick of low density closed cell polymeric foam having a density of less than about 0.32 grams per cubic centimeter on the side of said flexible bonding layer opposite said projecting stem portions, and a layer of soft tacky pressure sensitive adhesive on the side of said layer of foam opposite said bonding layer.

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