Process and system for the manufacturing of slabs made of resin-bonded mineral grits

A process for the manufacturing of slabs made of resin-bonded mineral grits comprising at least the phases of:

• supply of at least one mixture made of mineral grits and resins;
• compaction of said mineral grits and resins to obtain a compacted slab;
• hardening of said compacted slab to obtain a finished slab provided with at least one exposed surface and having an intrinsic degree of porosity;
• wherein the phase of hardening is performed by means of a first heating operation of said compacted slab at a temperature comprised between 100° C. and 150° C.;
• cooling down the finished slab after the first heating operation;
• decoration with ink by digital printing of said exposed surface according to at least one predefined design;
• and
• prior to said decoration and subsequently to said hardening, at least one phase of increase in said intrinsic degree of porosity of the finished slab, adapted to promote the penetration of said ink in said finished slab, where the phase of increasing is performed by means of a second heating operation of at least said exposed surface carried out at a temperature comprised between 30° C. and 180° C. said phase of increasing the degree of porosity being performed after said phase of cooling down the finished slab.