Process for producing thermoplastic sheets

A thermoplastic board production process comprising:

• feeding a molten plastic mass to an extruder that operates at temperatures between 100° C. and 450° C., wherein the molten plastic mass is fed to the extruder by a high pressure doser system and high pressure compactor;
• rolling the plastic mass in a rolling line, wherein the rolling comprises:
• pre-forming the plastic mass from the extruder, wherein the plastic mass is pre-formed by a flat die;
• absorbing volumetric variations of the plastic mass from the flat-die, wherein the plastic mass variations are absorbed by an accumulator;
• rolling the plastic mass through a first pair of rollers of a first rolling group that receives the plastic mass from the accumulator;
• passing the plastic mass through cool pressing plates of the first rolling group, said cool pressing plates positioned after the first pair of rollers;
• rolling the plastic mass through a second pair of rollers of a second rolling group that receives the plastic mass from the first rolling group;
• passing the plastic mass through cool pressing plates of the second rolling group, said cool pressing plates positioned after the second pair of rollers;
• hardening the plastic mass through a third pair of rollers of a hardening rolling group that receives the plastic mass from the second rolling group;
• and
• passing the plastic mass through cool pressing plates of the hardening rolling group, forming a board, said cool pressing plates positioned after the third pair of rollers;
• pulling the board from the hardening rolling group, wherein the board is pulled by a first puller that directs the board to a group of cool pressing plates of a molecular fixing line;
• cutting the board in a cutting line-comprising a side cutting saw to define final width of the board, a dividing saw to optionally cut the board lengthwise, a second puller to move the board through the cutting line, and a square cutting saw for final cutting of the board;
• and
• delivering the board from the cutting line in a receiving table.