US 12,330,995 B2
Method for obtaining porcelain stoneware tiles with anti-slip surface
Maurizio Mazzotti, Imola (IT); Yuri Beghi, Formigine (IT); and Alan Bazzani, Marano sul Panaro (IT)
Assigned to GRUPPO CONCORDE S.P.A., Fiorano Modenese (IT)
Filed by GRUPPO CONCORDE S.P.A., Fiorano Modenese (IT)
Filed on May 5, 2023, as Appl. No. 18/143,639.
Prior Publication US 2024/0368044 A1, Nov. 7, 2024
Int. Cl. C04B 41/50 (2006.01); C03C 8/16 (2006.01); C04B 33/24 (2006.01); C04B 41/00 (2006.01); C04B 41/45 (2006.01); C04B 41/86 (2006.01); C09K 3/14 (2006.01)
CPC C04B 41/5022 (2013.01) [C03C 8/16 (2013.01); C04B 33/24 (2013.01); C04B 41/0072 (2013.01); C04B 41/4547 (2013.01); C04B 41/86 (2013.01); C09K 3/1418 (2013.01); C03C 2209/00 (2013.01)] 7 Claims
 
1. A method for obtaining a porcelain stoneware tile with anti-slip surface, said method comprising the steps of
preparing the raw materials suitable to obtain the tile, and forming a mixture suitable to define the tile,
pressing the mixture,
drying the product obtained by pressing,
enamelling the dried tile with an enamelling product,
firing the enamelled tile,
grinding the enamelled tile,
wherein
the enamelling step is carried out with an enamelling product comprising a mixture of micro-grits having dimensions smaller than 100 μm added to an enamel, the micro-grits being present in the mixture in a percentage smaller than or equal to 25% by dry weight, the remaining percentage mainly being defined by enamel, said mixture of micro-grits comprising two micro-grits, a first micro-grit having the following composition:
Al2O3 between 10% and 20% by weight on the total;
CaO between 10% and 20% by weight on the total;
K2O between 1% and 5% by weight on the total;
MgO between 1% and 5% by weight on the total;
Na2O between 1% and 5% by weight on the total;
SiO2 between 50% and 60% by weight on the total;
SrO between 1% and 5% by weight on the total;
ZnO between 1% and 5% by weight on the total,
the second micro-grit having the following composition:
Al2O3 between 20% and 30% by weight on the total;
CaO between 5% and 10% by weight on the total;
K2O between 1% and 5% by weight on the total;
MgO between 1% and 5% by weight on the total;
Na2O between 1% and 5% by weight on the total;
SiO2 between 50% and 60% by weight on the total;
ZnO between 1% and 5% by weight on the total.