Fusible rib bonding of fasteners to substrate
AssigneeMinigrip, Inc.
InventorPer Bentsen
Life of this patent
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Abstract
A plastic separable fastener strip, and assembly of such strip with a substrate, and a method of attaching such strip to a substrate, comprising the provision of and utilization of fusible ribs on the base surface of the fastener strip to provide a bonding layer for bonding the strip to the substrate. Reducing the ribs into fusible condition without heat distortion of the remainder of the fastener strip and without heat distortion or damage of the substrate, provides a bonding layer when the fused ribs of the fastener strip are pressed together with the substrate. A simple apparatus and method are provided for effecting the bonding by fusion of the fusion ribs.
Claims12
A method of attaching plastic separable fastener strip to a substrate which comprises:
- providing an extruded thermoplastic fastener strip having a base surface and profile means projecting on said strip opposite to said base surface for separably interlocking with complementary profile means on a companion fastener strip;
- providing on said base surface, and as an integral part of the extruded strip, ribs of substantially less mass than said profile means and relatively closely spaced from one another;
- and
- fusing said ribs into a bonding layer and thereby bonding said base surface to the substrate by subjecting said strip to heat in an amount to place said ribs in a fusible condition but not to deform said profile means owing to said different masses thereof.
A method for attaching an extruded plastic separable fastener strip to a substrate comprising the steps of:
- feeding preformed substrate web to a bonding zone;
- feeding a thermoplastic fastener strip to a heating zone preceding said bonding zone, said strip having a base surface provided with a plurality of fusible ribs and an opposite surface having projecting elements thereon, said ribs and said elements comprising integrally extruded parts of the strip and said ribs having substantially less mass than said elements;
- subjecting said strip to heat in said heating zone in an amount for placing said ribs in a fusible condition while retaining said elements underformed owing to the different masses of said ribs and said elements;
- and
- pressing the fastener strip against said web in said bonding zone with said base surface facing the web thereby squeezing the still fusibly conditioned ribs into a layer bonding said base surface to said web.
Dependencies are inferred from the claim text.