Precision dispensing process control

B - Operations – Transporting – 67 – D

Patent

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Details

B67D 7/08 (2010.01) G01G 17/06 (2006.01) H01L 21/00 (2006.01) H01L 21/56 (2006.01)

Patent

CA 2246193

An apparatus and method that precisely controls the amount of liquid dispensed from dispensing apparatus onto an article. The present invention controls the weight of the dispensed liquid by using a force transducer that precisely weighs the article and dispensed liquid during the dispensing process. This weight value is input to a computer controller of an automatic dispenser that embodies a computer program that controls a liquid dispensing pump. Liquid is dispensed until the desired weight of liquid that is to be dispensed is reached, defined by an upper limit in the program. The flow of dispensed liquid is reduced when the weight limit is approached, and is stopped when the weight limit is reached. Thus, in the present invention, the weight (orvolume) of the dispensed liquid is controlled in real time during the dispensing process. Closed loop control of the dispensing pump using liquid weight as the controlling variable improves the volumetric accuracy and repeatability of the dispensing process.

L'invention concerne un appareil et une méthode qui contrôlent de façon précise la quantité de liquide débité par un appareil distributeur sur un article. La présente invention contrôle le poids du liquide distribué en ayant recours à un capteur de force qui pèse précisément l'article et le liquide débité pendant l'écoulement du liquide. La valeur correspondant au poids est introduite dans un ordinateur de commande d'un distributeur automatique, qui comprend un programme informatique commandant une pompe distributrice de liquide. Le liquide est débité jusqu'à ce que le liquide débité atteigne le poids voulu, défini par une limite supérieure, dans le programme. Lorsque la limite de poids approche, le débit de liquide diminue, et il s'interrompt lorsque la limite est atteinte. Ainsi, selon la présente invention, le poids (ou le volume) du liquide débité est contrôlé en temps réel pendant l'écoulement du liquide. L'asservissement de la pompe distributrice à la variable poids du liquide améliore la précision volumétrique et la répétabilité du processus de distribution.

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