Production process of plastic parts by reaction injection...

B - Operations – Transporting – 29 – C

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B29C 67/24 (2006.01) B29B 7/76 (2006.01)

Patent

CA 2561180

The present invention relates to a process and device RIM involving a mixing chamber (1) with opposing injectors (2, 3). The efficiency is maximised through the operation in flow regimes with very strong mixing dynamics, which is assured by means of the introduction of schemes to: detect the flow regime within the mixing chamber, through the dynamic pressure measurement upstream of the injectors (2, 3), using means (5); and/or impose a chaotic flow regime, through the pulsation of the opposed jets, using means (6). Alterations in design, comparatively to the traditional geometries, are also proposed, concerning: the mixing chamber (1), being foreseen a prismatic rectangular chamber; the injectors (2, 3), being foreseen elongated injectors; and even the scheme of injection of the materials, using a third injector (4).

L'invention concerne un procédé et un dispositif de moulage par injection et réaction (RIM) comprenant une chambre de mélange (1) équipée d'injecteurs opposés (2, 3). L'efficacité est maximum lorsque le dispositif fonctionne à des régimes d'écoulement à dynamique de mélange très forte assurée à l'aide de mécanismes permettant de détecter le régime d'écoulement à l'intérieur de ladite chambre via une mesure de pression dynamique en amont des injecteurs (2, 3) à l'aide de moyens (5); et/ou par imposition d'un régime de flux chaotique via la pulsation des jets opposés à l'aide de moyens (6). Des modifications de conception par rapport aux géométries traditionnelles sont également proposées, celles-ci concernant la chambre de mélange (1) prévue sous forme de chambre prismatique rectangulaire; les injecteurs (2, 3) prévus pour être allongés; et même le mécanisme d'injection des matières prévu pour utiliser un troisième injecteur (4).

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