초록 ▼

There is provided a method of deforming the hook head portions of hook elements on a web backing. The hook elements on the web backing are fed into a nip formed between a support surface and an upper heated surface having a durameter hardness of less than 90 Shore A. This upper heated surface compre

There is provided a method of deforming the hook head portions of hook elements on a web backing. The hook elements on the web backing are fed into a nip formed between a support surface and an upper heated surface having a durameter hardness of less than 90 Shore A. This upper heated surface compressively engages the hook head causing it to turn down and permanently deform. This increases the uniformity of the hook head elements forming a fiber engaging crook region.

대표청구항 ▼

[ We claim:] [1.] A method of forming a headed stem mechanical fastener having a backing web and an array of upstanding hook elements with upstanding stem base portions and hook heads with downwardly projecting fiber engaging portions comprising:a) providing a web having a web backing with an array

[ We claim:] [1.] A method of forming a headed stem mechanical fastener having a backing web and an array of upstanding hook elements with upstanding stem base portions and hook heads with downwardly projecting fiber engaging portions comprising:a) providing a web having a web backing with an array of substantially upstanding thermoplastic hook element projections each formed at least in part by a substantially upstanding stem base portion and a hook head having a fiber engaging portion and a top portion where the fiber engaging portion extends outward from the stem base portion, the web including the hook element projection having an average first thickness;b) providing a nip having at least one heated deformation surface member having an elastically deformable surface having an effective durometer hardness of less than 90 shore A and at least one opposing surface member defining a gap which has a compression zone defined by a entry gap width and a end gap width, where the entry gap width is substantially equal to or less than the web first average thickness;c) moving the web along a web path into and through the compression zone such that at least a portion of the array of substantially upstanding hook element fiber engaging portions are preferentially deformed downward relative to the hook head top portion by elastic deformation of the heated surface deformation member.