Process for the manufacture of slabs and panels of ceramic...

B - Operations – Transporting – 28 – B

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B28B 7/40 (2006.01) B28B 11/24 (2006.01) C04B 33/24 (2006.01) C04B 35/63 (2006.01) C04B 35/80 (2006.01)

Patent

CA 2494853

In the manufacture of slabs and panels of ceramic material according to the vacuum vibrocompaction method described in Italian patent 1,311,858, the initial mix is formed using ceramic sands having a grain size of less than 2.5 mm, preferably less than 1 mm, and ceramic powders, together with a binding additive in the form of an aqueous solution consisting of sodium silicate in a concentration greater than 24~ Baumé, fibres of high-melting transparent inorganic material, preferably high-melting glass, also being added to the mix. The slabs obtained have an improved mechanical strength, a reduced porosity and improved aesthetic properties, in addition to being free from cracks and microscopic fissures.

Dans la production de dalles et de panneaux en matériau céramique selon le procédé de compactage par vibrations sous vide décrit dans le brevet italien 1311858, le mélange initial est formé à l'aide de sables à céramique ayant une grosseur de grain inférieure à 2,5 mm, de préférence inférieure à 1 mm, et à l'aide de poudres de céramique, avec un additif de liaison se présentant sous la forme d'une solution aqueuse contenant du silicate de sodium en une concentration supérieure à 24 · de Baumé, des fibres en matière inorganique transparente à haut point de fusion, de préférence du verre à haut point de fusion, étant également ajoutées au mélange. Les dalles obtenues présentent une résistance mécanique améliorée, une porosité réduite ainsi que des meilleurs propriétés esthétiques, en plus d'être exempte de fissures et de microfissures.

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