Process and apparatus to continuously form a uniform sheet...

Details Process and apparatus to continuously form a uniform sheet... Process and apparatus to continuously form a uniform sheet...

B - Operations, Transporting

29

C

B29C 47/00 (2006.01)

Patent

CA 2548083

A process and apparatus are disclosed for the continuous manufacture of a polyurethane sheet to be used as polishing pad for chemical-mechanical polishing. The process uses urethane pre-polymers and fillers/additives fed from a tank (10) which is mixed with a curing agent stored in a nitrogen blanked tank (20) inside a dynamic mixer (30). The reacting composition (32) is fed to a feed end of a double steel belt press (40) which is heated and compressed therein. A continuous sheet exits that the belt press (40) and is cut to length by a roller blade cutter (62). Cut sheets (32B) are then stacked (70) and post cured in an oven (80).

L'invention concerne un procédé et un appareil permettant de fabriquer en continu une feuille de polyuréthanne à utiliser en tant que tampons de polissage, notamment, de polissage chimico-mécanique. Ledit processus consiste à commander avec précision le traitement de paramètres de manière à engendrer un mélange polymère, le mélange avec un durcisseur, la dispersion du mélange dans l'extrémité d'amenée d'un filtre à bande presseuse double et la solidification du mélange afin de former une feuille polymère. Cette feuille peut être ensuite découpée à une certaine taille et la surface supérieure conditionnée pour former un tampon de polissage. Ce procédé est, notamment, approprié à la fabrication à grand débit d'un produit consistant, la consistance dudit produit possédant un effet direct sur l'efficacité du polissage.

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