Process for forming muti-coloured porcellainized ceramic stone tiles by extrusion

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EP 1 048 425 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	02.01.2003 Bulletin 2003/01

(43)	Date of publication A2:
	02.11.2000 Bulletin 2000/44

(21)	Application number: 00201306.8

(22)	Date of filing: 11.04.2000

(51)	International Patent Classification (IPC)⁷: B28B 3/20, B28B 1/00, B29C 47/04

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

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Priority:

27.04.1999 IT RE990050

(71)	Applicant: Sacmi-Cooperativa Meccanici Imola-Soc. Coop. A.R.L.
	40026 Imola (Bologna) (IT)

(72)	Inventor:
	Rivola, Pietro, c/o SACMI-Soc. Coop. A.R.L. 40026 Imola (Bologna) (IT)

(74)	Representative: Corradini, Corrado et al
	Studio Ing. C. CORRADINI & C. S.r.l. 4, Via Dante Alighieri 42100 Reggio Emilia 42100 Reggio Emilia (IT)

(54)	Process for forming muti-coloured porcellainized ceramic stone tiles by extrusion

(57) A process for forming tiles of porcellainized ceramic stone by extrusion, comprising the following operations:

preparing at least two pastes, typologically defined as porcellainized ceramic stone, having different colours;
feeding said at least two pastes into a mixing device and/or injecting them directly into the extruder chamber (6);
subjecting the mixed material to the action of a screw extruder (7);
subjecting the mass advancing within the extruder (6), downstream of the screw (7) and upstream of the die braking system, to the action of at least one flow deviator means (9,10,11,12);
from the extruded web obtained in this manner, separating portions corresponding to the formed objects.