Method and apparatus for dispensing small amounts of liquid...

B - Operations – Transporting – 05 – C

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B05C 11/10 (2006.01) B05C 5/00 (2006.01) B05C 5/02 (2006.01) B23K 1/20 (2006.01)

Patent

CA 2330953

Apparatus and methods for dispensing droplets of liquid or viscous material. The apparatus generally comprises a valve operated dispenser (10) and a control (128', 129) for moving the valve member (42') with respect to a valve seat (38') in rapid succession. This rapidly accelerates liquid or viscous material in a stream from the dispenser outlet and immediately breaks the stream into a minute droplet. Various embodiments of the valve seat (38') include both rigid valve seats and resilient valve seats. Resilient valve seats are especially useful for dispensing solder pastes as they can prevent material flaking, compacting and clogging conditions. Low friction polymer or plastic material for dispenser components such as the valve member (42') and outlet structure (40') can also prevent such problems.

L'invention concerne un dispositif et des procédés permettant la distribution de gouttelettes d'une matière liquide ou visqueuse. Ce dispositif comprend en général un distributeur (10) opéré par une soupape, et une commande (128', 129) permettant de déplacer l'élément soupape (42') par rapport au siège (38') de soupape dans un mouvement de succession rapide. Ce processus accélère rapidement la matière liquide ou visqueuse d'un flux sortant de l'orifice de distribution et interrompt immédiatement ce flux pour former un gouttelette minuscule. Les diverses versions du siège (38') de soupape comprennent des sièges rigides et des sièges souples. Les sièges de soupape souples conviennent en particulier pour distribuer des pâtes de soudure, car elle peuvent empêcher les problèmes d'effritement, de compression et de colmatage du matériau. Ces problèmes peuvent également être évités par l'utilisation de matériaux polymères ou plastiques à coefficient de frottement réduit pour les composants de distribution tels que l'élément (42') de soupape et la structure (40') de l'orifice de sortie.

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