Colouring process for ceramic materials
OwnerGraziano Vignali, Frabrizio Guizzardiinventors
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Abstract
Process for colouring with pink/orange shades on surface and to a variable depth manufactured items obtained from a ceramic mass added with zinc oxide in an amount of 5% to 20% by weight, or with zinc silicate, said process uses a composition being in form of an aqueous or hydroalcoholic solution comprising Cr organic derivatives or inorganic salts alone or in combination with Fe organic derivatives or inorganic salts and/or Zn organic derivatives or inorganic salts, which is applied by controlled absorption onto the surface of the ceramic body before its firing in an oven according to a standard ceramic cycle.
Claims16
Process for obtaining manufactured ceramic articles coloured on surface and inside at variable depth up to 2.5 mm, with pink-orange shades, from a stoneware mass, added before moulding with a Zn inorganic compound selected from Zn oxide or Zn silicate, in an amount corresponding to 4%÷16% by w. of Zn (as element) on dry weight and by the treatment of the moulded article before firing with an aqueous or hydroalcoholic solution of Cr or Cr and Fe or Cr and Zn or Cr, Fe and Zn inorganic salts or organic derivatives, the amount of said solution used in the treatment being comprised between 20 and 600 g/m2 of final coloured surface.
Dependencies are inferred from the claim text.