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AssigneeMinnesota Mining and Manufacturing Company
InventorsWilliam L. Melbye, Susan K. Nestegard, Leigh E. Wood, Marvin D. Lindseth, Dale A. Bychinski
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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 cavitites 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.
A mushroom-type hook strip that can be used in a hook-and-loop mechanical fastener, said strip comprising a homogeneous backing of thermoplastic resin and, integral with said backing, an array of upstanding stems distributed across at least one face of the backing, each of said stems having a base adjacent said backing and a mushroom head at the end of the stem opposite said backing, said stems having a molecular orientation as evidenced by a birefrigence value of at least 0.001.
Dependencies are inferred from the claim text.