Method for making a mushroom-type hook strip for a mechanical fastener
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United States of America Patent
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Mar 13, 2007
Issued Date -
N/A
app pub date -
Oct 20, 2003
filing date -
Sep 21, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A mushroom-type hook strip for a hook-and-loop fastener has a flexible backing of thermoplastic resin and, integral with backing, an array of upstanding stems distributed across at least one face of the backing, each having a mushroom head. The stems have a molecular orientation as evidenced by a birefringence value of at least 0.001. The mushroom-type hook strip can be produced continuously by injecting resin into cavities of a cylindrical mold while evacuating and cooling the cavities so that the cooled resin becomes molecularly oriented, thus affording to the stems excellent stiffness, durability, and tensile and flexural strength.
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