MULTIHEADED HOOK

摘要

The present invention provides a method for forming preferably a unitary polymeric hook fastener (20) comprising a flexible backing (11), and a multiplicity of spaced hook members (24) projecting from the upper surface of the unitary backing (11) wherein each hook member (24) comprises a multiplicity of hook head elements (28, 29) projecting in substantially the same direction. The hook members each comprise a stem portion (25) attached at one end to the backing (11), and a head portion (28, 29) at the end of the stem portion (25) opposite the backing (11). The head portion (28, 29) can also extend from a side of a stem portion (25) or be omitted entirely to form alternative projections which can be other forms than a hook member. The head portion (28, 29) preferably projects past the stem portion (25) on at least one of two opposite sides. At least the hook head portions (28, 29) have two or more hook head elements (28, 29) on at least one of the two opposing sides of the stem (25). The hook head portions (28, 29) 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.