Method and apparatus for forming articles made of polyurethane

B - Operations – Transporting – 29 – B

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

B29B 7/12 (2006.01) B29C 44/00 (2006.01) B29C 44/34 (2006.01) B29C 44/60 (2006.01) C08G 18/08 (2006.01)

Patent

CA 2123483

2123483 9314137 PCTABS00024 A method and apparatus for forming articles made of polyurethane. The apparatus (10) includes a polyol weigh tank (12), an isocyanate weigh tank (20), an additive tank (26) and a mix tank (16) enclosed by a vent chamber (50). The vent chamber (50) is in communication with inlet (58) and outlet (60) pipes to move air and fumes from the interior of the vent chamber (50) past a filter (64). The apparatus (10) further includes a containment vessel (80) also having inlet (88) and outlet (90) pipes for movement of air and fumes. The containment vessel (80) is in communication with a pump (P) for creating a vacuum in the vessel (80) to reduce pressure in the interior of the vessel (80) in which a mold (110) is placed. The method includes the steps of: creating a vacuum around a mixture of at least one polyol, at least one isocyanate and at least one additive, to lower the pressure on the mixture below atmospheric pressure as the mixture expands; allowing the mixture to expand; reducing the vacuum to increase the pressure on the mixture in proportion to any further expansion of the mixture caused by the generation of a blowing influence in the mixture; and returning the pressure to atmospheric pressure.

2123483 9314137 PCTABS00024 Cette invention concerne une méthode et un appareil pour la fabrication d'articles en polyuréthanne. L'appareil (10) comprend un bassin de pesée de polyol (12), un bassin de pesée d'isocyanate (20), un réservoir d'additif (26) et un réservoir de mélange (16) disposés à l'intérieur d'une chambre de mise à l'air libre (50). La chambre (50) est raccordée à des tuyaux d'admission (58) et d'évacuation (60) servant à acheminer l'air et les vapeurs se trouvant à l'intérieur vers un filtre (64). L'appareil (10) comporte en outre une enceinte de confinement (80) également raccordée à des tuyaux d'admission (88) et d'évacuation (90) pour la circulation de l'air et des vapeurs. Cette enceinte (80), qui reçoit un moule (110), est raccordée à une pompe (P) servant à y créer une dépression. La méthode objet de l'invention comprend les étapes suivantes : création d'une dépression autour d'un mélange composé d'au moins un polyol, d'au moins un isocyanate et d'au moins un additif afin de permettre l'expansion dudit mélange; expansion dudit mélange; réduction de la dépression en fonction de la surexpansion engendrée par un effet de soufflage à l'intérieur du mélange; et rétablissement de la pression atmosphérique dans l'enceinte.

LandOfFree

Say what you really think

Search LandOfFree.com for Canadian inventors and patents. Rate them and share your experience with other people.

Rating

Method and apparatus for forming articles made of polyurethane does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for forming articles made of polyurethane, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for forming articles made of polyurethane will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFCA-PAI-O-1778806

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.