A process for the stereolithographic preparation of a mould...

B - Operations – Transporting – 29 – C

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B29C 33/38 (2006.01) B29C 67/00 (2006.01) G03F 7/00 (2006.01) G03F 7/027 (2006.01)

Patent

CA 2236669

A method for making a mould comprising the steps: a) forming a layer of a photocurable composition containing a UV transparent filler, b) irradiating the layer formed in step a) with light in a predetermined pattern thereby forming a solid cross-sectional layer of the desired mould; and c) repeating steps a) and b) on the previously formed solid cross-sectional layer until the mould is formed. The filler is preferably a crystalline phyllosilicate clay mineral and the mould has heat and pressure shock resistant properties making it particularly useful for injection moulding.

L'invention concerne un procédé pour réaliser un moule, consistant à: (a) former une couche d'une composition photodurcissable contenant une charge transparente aux UV; (b) exposer la couche formée à l'étape (a) à une lumière suivant un motif prédéterminé pour former une couche solidifiée sur toute l'épaisseur ayant la forme souhaitée; et (c) répéter les opérations (a) et (b) sur la couche solidifiée sur toute l'épaisseur formée précédemment, jusqu'à obtenir le moule souhaité. La charge est de préférence une argile minérale du type phyllosilicate cristallin. Le moule obtenu a de bonnes propriétés de résistance aux chocs de pression et aux chocs thermiques, ce qui le rend particulièrement utile pour le moulage par injection.

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