Form tool for producing particle foam molded parts

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 44/58 (2006.01) B23P 15/24 (2006.01) B29C 33/30 (2006.01) B29C 33/38 (2006.01) B29C 44/44 (2006.01)

Patent

CA 2467755

The invention relates to a form tool for producing particle foam moulded parts. Said form tool comprises at least one tool part consisting of a finite number of layers which are parallel to each other, at least in segments, the individual layers having contours such that a pile formed by all of the layers defines at least one part of a form cavity which can be filled with expandable foamed material pearls of a thermoplastic material. The inventive form tool also comprises means for supplying and discharging gaseous and liquid heat transfer media. The aim of the invention is to produce particle foam moulded parts faster and with improved surface quality and to achieve uniform bonding of the foam particles, at the same time reducing the energy amount required to produce the moulded parts. To this end, the layers are arranged, at least in their regions which are adjacent to the form cavity, at a defined distance from each other in such a way that they form channels which are outwardly sealed, but are open inside the tool part for the penetration of the gaseous and liquid heat transfer media.

L'invention concerne un moule de production de pièces moulées en mousse à base de particules comprenant au moins un nombre fini de parties composées de couches de disposition parallèle au moins par segments, les différentes couches ayant des contours tels qu'une pile formé de l'ensemble de toutes les couches définit au moins une partie d'une empreinte qui est remplie de perles de produit alvéolaire expansible d'une matière plastique thermodurcissable. Ce moule comprend également des moyens d'alimentation et d'évacuation d'agents caloporteurs gazeux ou liquides. L'invention vise à obtenir une production plus rapide de pièces moulées en mousse à base de particules ayant une surface de meilleure qualité et un soudage régulier des particules moussantes tout en réduisant la quantité d'énergie nécessaire à la production des pièces moulées. A cet effet, les couches sont, au moins dans leurs zones adjacentes à l'empreinte, situées à une distance définie l'une de l'autre en formant des canaux qui sont fermés hermétiquement vers l'extérieur mais ouverts à l'intérieur du moule en vue du passage de l'agent caloporteur gazeux ou liquide.

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