Mold made of porous concrete

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 33/38 (2006.01) B29C 51/30 (2006.01)

Patent

CA 2187123

For thermoforming a sheet of plastic material, a mold is made of porous concrete. More specifically, the mold comprises a body of porous concrete having a mold surface section and a second surface section. An impervious wall made of high performance concrete is applied to the second surface section of the body of porous concrete for sealing this second surface section. A duct is formed through the high performance concrete of the impervious wall and is connectable to a vacuum equipment for sucking air through the mold surface section, the porous concrete of the body and the duct in view of applying a heated sheet of plastic material to the mold surface section of the porous concrete body. Preferably, the body of porous concrete comprises a core of concrete having a higher porosity, and an outer layer of concrete having a lower porosity in view of providing a smoother mold surface section.

Pour le thermoformage d'une feuille de matière plastique, on utilise un moule de béton poreux. Plus particulièrement, le moule comprend un corps de béton poreux ayant une section de moulage de surface et une seconde section de surface. Une paroi imperméable faite de béton à haut rendement est appliquée contre la seconde section de surface du corps de béton poreux afin de sceller cette section. Un conduit est créé à travers le béton à haut rendement de la paroi imperméable et peut être raccordé à un appareillage de mise sous vide qui aspire l'air à travers la section de moulage de surface et le béton poreux du moule. Cet effet de suction permet d'appliquer une feuille chauffée de matière plastique sur la section de moulage de surface du corps de béton poreux. De préférence, la partie intérieure du corps de béton poreux présente une plus grande porosité par rapport à la couche extérieure de béton. Cette dernière est moins poreuse, afin d'obtenir une section de surface plus lisse pour le moulage.

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