Device for producing foamed shaped parts, method for the...

C - Chemistry – Metallurgy – 25 – D

Patent

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C25D 7/00 (2006.01) B29C 33/56 (2006.01)

Patent

CA 2285303

The invention relates to a device for foaming foamed shaped parts in a form tool which can be opened and closed. Said tool is provided with a non-stick coating. The invention also relates to a method for the production of a form tool with a non-stick coating. Lastly, the invention relates to a method for producing a foamed shaped part. Foamed shaped parts stick to the form tools in which they are produced thereby making it difficult or even impossible to remove said parts therefrom. The invention provides a solution to this problem by creating a dense crystal-structure surface coating for said form tools. The molecules of the foaming systems are also excited by ionized air along the surfaces of said tools in such a way that the molecules cannot penetrate the crystal-structure coating. Molecular excitation of the foaming systems along the coating in the mold cavity occurs by means of a flat voltage potential which in turn obtains its impulsivity from the positive charged ionized gas that is blown in.

L'invention concerne un dispositif permettant de faire mousser des pièces en mousse moulée dans un outil de moulage à ouvrir et à fermer, muni d'un revêtement anti-adhérent. L'invention concerne également un outil de moulage muni d'un revêtement anti-adhérent, ainsi qu'un procédé permettant de produire une pièce en mousse moulée. De manière générale, les pièces en mousse moulée adhèrent aux outils de moulage dans lesquels elles sont produites, ce qui rend leur extraction extrêmement difficile, voire impossible. Pour pallier cet inconvénient, il est prévu selon l'invention de réaliser un revêtement pour les outils de moulage, qui présente une structure cristalline très dense en surface. A cet effet, les molécules des systèmes de mousse sont excitées par de l'air ionisé le long de la surface de l'outil de moulage, de manière à les empêcher de pénétrer dans la structure cristalline. L'excitation moléculaire des systèmes de mousse le long du revêtement dans la cavité de moulage s'effectue à l'aide d'un potentiel de tension plate qui éprouve à nouveau son impulsivité par l'intermédiaire du gaz injecté sous forme ionisée, à charge positive.

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