Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – With prevention of equipment fouling accumulations or deposits
Patent
1991-11-08
1997-03-04
Aftergut, Karen
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
With prevention of equipment fouling accumulations or deposits
D01D 520
Patent
active
056076355
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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Bychinski Dale A.
Lindseth Marvin D.
Melbye William L.
Nestegard Susan K.
Wood Leigh E.
Aftergut Karen
Griswold Gary L.
Huebsch William L.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
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