Multiheaded hook
First Claim
1. A unitary hook fastener of a polymeric resin comprising:
- a base film layer having generally parallel upper and lower major surfaces; and
a multiplicity of rows each having a multiplicity of spaced hook members projecting from the upper surface of said base film layer, the spaced hook members each comprising a stem portion attached at one end to said base film layer and a head portion at the end of the stem portion opposite said base film layer, at least some of the head portions having at least first and second adjacent hook head elements at the end of the stem portion, the at least first and second adjacent hook head elements each having first and second opposing sides spaced in the direction of the row, where the entire first opposing side of each first hook head element is flush with a first side of the stem portion but not with either the first or second opposing side of the second hook head element on the stem portion, where the second opposing side of each first hook head element is in face to face relation with the first opposing side of the second, adjacent hook head element on the stem portion, and where the first and second adjacent hook head elements each have hook engaging parts which project past a second side of the stem portion in substantially the same direction.
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Accused Products
Abstract
The present invention provides a method for forming preferably a unitary polymeric hook fastener comprising a flexible backing, and a multiplicity of spaced hook members projecting from the upper surface of the unitary backing wherein each hook member comprises a multiplicity of hook head elements projecting in substantially the same direction. The hook members each comprise a stem portion attached at one end to the backing, and a head portion at the end of the stem portion opposite the backing. The head portion can also extend from a side of a stem portion or be omitted entirely to form alternative projections which can be other forms than a hook member. The head portion preferably projects past the stem portion on at least one of two opposite sides. At least the hook head portions have two or more hook head elements on at least one of the two opposing sides of the stem. The hook head portions preferably have been heat treated so as to decrease the hook head thickness and thereby reducing or eliminating molecular orientation in at least the hook head in the machine direction.
28 Citations
20 Claims
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1. A unitary hook fastener of a polymeric resin comprising:
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a base film layer having generally parallel upper and lower major surfaces; and a multiplicity of rows each having a multiplicity of spaced hook members projecting from the upper surface of said base film layer, the spaced hook members each comprising a stem portion attached at one end to said base film layer and a head portion at the end of the stem portion opposite said base film layer, at least some of the head portions having at least first and second adjacent hook head elements at the end of the stem portion, the at least first and second adjacent hook head elements each having first and second opposing sides spaced in the direction of the row, where the entire first opposing side of each first hook head element is flush with a first side of the stem portion but not with either the first or second opposing side of the second hook head element on the stem portion, where the second opposing side of each first hook head element is in face to face relation with the first opposing side of the second, adjacent hook head element on the stem portion, and where the first and second adjacent hook head elements each have hook engaging parts which project past a second side of the stem portion in substantially the same direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A unitary hook fastener of a polymeric resin comprising:
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a base film layer having generally parallel upper and lower major surfaces; and a multiplicity of rows each having a multiplicity of spaced hook members projecting from the upper surface of said base film layer, the spaced hook members each comprising a stem portion attached at one end to said base film layer and a head portion at the end of the stem portion opposite said base film layer, at least some of the head portions having at least first and second hook adjacent head elements separated by a cut line at the end of the stem portion, the at least first and second adjacent hook head elements each having first and second opposing sides spaced in the direction of the row, where the entire first opposing side of each first hook head element is flush with a first side of the stem portion but not with either the first or second opposing side of the second hook head element on the stem portion, and where the first and second adjacent hook head elements each have hook engaging parts which project past a second side of the stem portion in substantially the same direction.
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Specification