Compression moulding thermoplastic material

A method for compression-forming of products comprised of a material comprising thermoplastic material, the method comprising:

• providing one or more the groups (10), each of which comprises:
• a female part (12) having a matrix cavity (M) and a male part (13) destined to penetrate into the matrix cavity (M) such as to define a forming chamber (F) of the product, the matrix cavity (M) of the female part being destined to contain a batch of material;
• loading a batch of material into the cavity (M) of each the group (10);
• applying to each the group (10) a respective thrust group destined to provide a penetrating thrust of the male part (13) into the matrix cavity (M) during forming of the product, the thrust group being mobile solidly with the respective die group (10) in displacements that the die group (10) undergoes during the operations performed in the heating and cooling stations and in the transfer from a station to another;
• heating the die group (10), loaded with a batch, in a heating station, up to bringing the plastic material contained therein to the fluid state, the thrust applied thereto being provided by the respective thrust group,
• transferring the die group (10) together with the respective thrust group from the heating station to a cooling station destined to cool the die group (10), and
• cooling the die group (10) in the cooling station, the thrust applied thereto being provided by the respective thrust group, wherein each thrust group comprises at least a thrust device (21, 210) having at least a thruster (24, 240) constrained to the male part and to the female part, the thruster (24, 240) providing a thrust which is such as to actuate penetration of the male part into the female part.