Ultrasonic seam bonding method and apparatus

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 65/08 (2006.01) B05B 17/06 (2006.01) B29C 65/00 (2006.01) B29C 65/42 (2006.01) B29C 65/52 (2006.01) B29C 65/78 (2006.01)

Patent

CA 2323546

This invention relates to an apparatus and method for joining fabric, particularly for joining separate pieces of layered fabric, by means of a waterproof seam in a single operation. The seam bonding apparatus comprises a hot-melt adhesive supply (20), a transducer (24) which supplies ultrasonic energy and a sonotrode (23) which directs the ultrasonic energy to an application point on the seam to be bonded. Adhesive, preferably molten nylon, is fed through a passage (25) in the sonotrode (23) via an exit aperture (28) at the end of the sonotrode to the application point. Local heat is applied to the other side of the seam at the application point, and the seam is then subjected to local cooling to form a permanent waterproof seam.

Cette invention a trait à un appareil ainsi qu'à la technique afférente permettant d'assembler des tissus, notamment des pièces distinctes d'un tissu en couches, au moyen d'un raccord étanche à l'eau et ce, en une seule opération. Cet appareil à souder est équipé d'un dispositif d'alimentation en adhésif thermo-fusible (20), d'un transducteur (24) fournissant l'énergie ultrasonore et d'une sonotrode (23) dirigeant l'énergie ultrasonore vers une zone d'application sur le raccord à souder. L'adhésif, du nylon fondu de préférence, qui est amené par un passage (25) ménagé dans la sonotrode (23), sort par un orifice de sortie (28) situé à l'extrémité de la sonotrode pour se diriger sur la zone d'application susmentionnée. On chauffe localement l'autre coté du raccord au niveau de la zone d'application puis l'on refroidit localement le raccord de manière à obtenir un raccord permanent étanche à l'eau.

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