Molding of fastening hooks and other devices

A - Human Necessities – 44 – B

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A44B 18/00 (2006.01) B29C 33/42 (2006.01) B29C 47/00 (2006.01) B29C 59/02 (2006.01) C23F 1/00 (2006.01) C23F 1/02 (2006.01) C23F 1/04 (2006.01) F16B 5/07 (2006.01)

Patent

CA 2257501

Methods of forming mold cavities (1) suitable for hook and loop fastening (100), along with effective hook construction and hook and loop fastener products that have an ultrathin cross section (118). Photochemical techniques are employed to form plates (250) that define hook-form mold cavities (1), and, alternatively, chemical etching is employed following preforming of the cavities and machining. Included are hooks having three-dimensional tapers with enhanced loop engaging characteristics. By utilization of special surface finishes and tolerances, hook fasteners, having ultrathin cross sections (118) are realized, that pave the way for practical use of touch fasteners in a wide range of new areas.

L'invention concerne des procédés pour la formation de cavités de moulage (1) adaptées aux systèmes de fermeture à boucles et crochets (100), la fabrication rationnelle de crochets et lesdits systèmes de fermeture à boucles et crochets ayant une section transversale extrêmement fine (118). On a recours à des techniques photochimiques pour préparer les plaques (250) définissant les cavités de moulage (1) de formation des crochets, et on peut encore recourir à l'attaque chimique après avoir préformé les cavités et procédé à l'usinage. Sont également décrits des crochets ayant des rétrécissements tridimentionnels dont les caratéristiques d'accrochages de boucles sont améliorées. L'utilisation de tolérances et de finis de surface spécifique permet de fabriquer des systèmes d'attache par crochets ayant une section transversale extrêmement fine (118) débouchant sur des applications pratiques d'assemblage par crochets en contact dans un large éventail de nouveaux domaines.

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