Method and apparatus for the manufacture of slabs of ceramic...

C - Chemistry – Metallurgy – 04 – B

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C04B 33/00 (2006.01) B28B 5/04 (2006.01) B28B 7/36 (2006.01)

Patent

CA 2287283

During the manufacture of slabs of ceramic material from a mixture formed by a grannulated material and by an inorganic binding phase, the starting mixture is spread on a support constituted by a mechanically resistant fabric or felt covered with a layer or sheet of release material permeable to water vapour such as paper, and the layer of mixture is covered with a protective sheet of release material, preferably rubber, after which forming is carried out by the application of a compacting pressure under vacuum combined with the simultaneous application of a vibratory motion; the resulting raw slab is released from the rubber sheet, transferred by pincer means to a support or metal grid used for the drying and firing steps, and is then sent to a drying oven after which, when the felt sheet has been removed, the visible surface is covered with a layer of refractory material and the raw slab is turned over and sent to the firing kiln where the permeable paper is removed by burning.

L'invention concerne un procédé de production de plaques de matériau céramique à partir d'un mélange formé par un matériau granulé et une phase de liaison inorganique dans lequel le mélange de départ est étalé sur un support constitué d'une toile ou d'un feutre résistant mécaniquement couvert d'une couche ou feuille de matériau de séparation perméable à la vapeur d'eau, tel que du papier. On couvre la couche de mélange d'une feuille protectrice de matériau de séparation, du caoutchouc de préférence, puis on forme la plaque en appliquant une pression de compactage sous vide ainsi qu'un mouvement vibratoire simultané. On enlève la feuille de caoutchouc de la plaque brute ainsi obtenue, qui est transférée avec un système de tenailles sur un support ou une grille en métal utilisée pour les étapes de séchage et de cuisson. On envoie alors la plaque vers un four de séchage après quoi, une fois la feuille de feutre retirée, on en recouvre la surface visible d'une couche de matériau réfractaire, on la retourne et on l'envoie dans le four de cuisson où le papier perméable est brûlé.

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