Patent ID: 6991843

Claim:
A hook fastener pre-form product for subsequent formation of a loop engaging hook fastener product, the pre-form product comprising: a base sheet having a surface of thermoplastic resin; and a plurality of stem formations formed integrally with the surface to protrude therefrom, the stem formations being arranged for engagement with a field of loops after deformation of terminal ends, each of the stem formations including a first portion extending upwardly from the surface and a second portion extending upwardly from the first portion to a distal end to define a height of the stem formation relative to the surface, each first portion having only one second portion extending therefrom, an intersection of the second and first portions occurring at a distance from the surface equal to at least half the height of the stem formation, the intersection defining a discrete transition in cross-sectional area of the stem formation that corresponds to a flat upper surface of the first portion, such that the second portions are more susceptible to deformation energy than the first portions, and are sized to form heads that overhang sides of the first portions for releasable engagement with a loop product, when deformed.