Buckles – buttons – clasps – etc. – Including readily dissociable fastener having numerous,... – Having filaments constructed from coated – laminated – or...
Reexamination Certificate
2007-03-06
2007-03-06
Lavinder, Jack W. (Department: 3677)
Buckles, buttons, clasps, etc.
Including readily dissociable fastener having numerous,...
Having filaments constructed from coated, laminated, or...
C024S442000
Reexamination Certificate
active
11016993
ABSTRACT:
A method for forming a unitary polymeric projection or fastener comprising a thin, strong flexible backing, and a multiplicity of thin spaced hook members projecting from the upper surface of the unitary backing the method generally including extruding a thermoplastic resin through a die plate which die plate is shaped to form a base layer and spaced ridges, ribs or hook elements projecting above a surface of the base layer. When the die forms the spaced ridges or ribs the cross sectional shape of the hook members are formed by the die plate while the initial hook member thickness is formed by transversely cutting the ridges at spaced locations along their lengths to form discrete cut portions of the ridges. Subsequently longitudinal stretching of the backing layer (in the direction of the ridges on the machine direction) separates these cut portions of the ridges, which cut portion then form spaced apart hook members. The extruded hook members or cut rib hook members are then heat treated resulting in shrinkage of at least a portion of at least the hook head portion thickness by from 5 to 90 percent, preferably 30 to 90 percent.
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Ausen Ronald W.
Miller Philip
Seth Jayshree
Unruh William C.
3M Innovative Properties Company
Bond William J.
Lavinder Jack W.
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