Abstract: A tunnel drier particularly for plastic materials has a screw-conveyor operated by an electric motor through a reducer.The shaft (11) of the screw is suspended rotatably in tapered roller bearings (9). The helical vanes (12) of the screw conveyor advance the material fed through a hopper (5), through a drying channel (4). Halfway between the last turn of the helical vane (12) and disposed at 90.degree. to the shaft (TR'), there is a semicircular section (13) to break up the material before it enters the high pressure area where the action of the advancing screw ends. This area is equipped with openings, in greater density in the high pressure area (6) than in the next section (6'). The shaft (11) is hollow downstream from the helical vane and has openings (6") in the final section. A truncated cone collar (14) and a flap door (7) with adjustable height, facilitate compression inside the channel (4).

Abstract: Machine for shearing films of thermoplastic material between a compression surface (5), joined to a piston (4) and operated hydraulically by means of a cylinder (3) from an electric motor powered pump, and the latticed bottom of a container (1). The latticed bottom has open mesh (8') along the perimeter, in which punches (6) on the compression surface (5) penetrate. The hydraulic device, the density of the cutting profiles and the cooperation of the punches (6) to expel the material through the mesh (8') reduce energy consumption to 1/10 with respect to rotation type shearing machines.