Process and apparatus for the manufacture of a molded part

Details Process and apparatus for the manufacture of a molded part Process and apparatus for the manufacture of a molded part

B - Operations, Transporting

29

B

B29B 7/74 (2006.01) B29B 7/82 (2006.01) B29C 67/24 (2006.01)

Patent

CA 2107438

In a process for the manufacture of a molded part from a non-porous, elastic polyurethane, the starting components are individually isothermally transported from storage tanks through closed loop conduits and pumps into a mixing head. Mixing of the components is carried out in the mixing head at a pressure of at least 150 bar and the resulting mixture is then expelled from the mixing head and into a mold. This process obviates the annealing step required in conventional polyurethane casting processes for solidification of the molded part manufactured therewith, Apparatus for the carrying out of the process are also disclosed.

Dans un processus de fabrication d'une pièce moulée à partir de polyuréthane élastique non poreux, les composants utilisés pour commencer le processus sont transportés individuellement, dans des conditions d'équilibre isothermique, depuis les réservoirs de stockage par des conduits en boucle fermée et des pompes jusqu'aux dispositifs de mélange où ils sont mélangés à une pression d'au moins 150 bars et le mélange obtenu est ensuite évacué du dispositif pour être versé dans le moule. Ce procédé rend superflue l'étape de recuisson nécessaire dans le cadre d'un procédé classique de coulée de polyuréthane afin de solidifier la partie moulée à partir de polyuréthane. L'invention porte également sur l'appareil servant à réaliser le processus.

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