Screw machine for processing plastic material and for the heating thereof until it has fused, with - a housing, comprising several housing sections (5 to 9) in a conveying direction of a plastic material to be processed arranged one after the other and connected with each other, - at least one housing bore (11, 12) formed in the housing, - a supply opening opening into the at least one housing bore (11, 12) for supplying the plastic material, - at least one treatment element shaft (13, 14), -- arranged in the associated housing bore (11, 12) and rotatably drivable about an associated axis of rotation (16, 17), and -- comprising several treatment elements (32 to 37, 32' to 37') for treating the plastic material, arranged in a torque-proof way on at least one associated shaft (30, 31) one after the other in the conveying direction, wherein at least one treatment element (33, 33') is formed from an electrically conductive material (M 3) at least in part in a heating zone characterised by an inductive heating device for heating the plastic material in the heating zone,wherein - at least one coil of the inductive heating device surrounds the at least one treatment element shaft (13, 14) and the at least one treatment elements shaft (13, 14) is arranged in an interior of the at least one coil, - at least one housing section is made from an electromagnetic transparent material (M 4) at least in part in the heating zone such that an inner sleeve arranged in the interior is exclusively made from the electromagnetic transparent material (M 4), wherein the electromagnetic transparent material (M 4) is nonmagnetic and not electrically conductive, and - the at least one coil is coolable with a cooling means, wherein -- the at least one coil forms a cooling channel or -- the inner sleeve entirely delimits a receiving space, in which the at least one coil is arranged, and the receiving space serves as a cooling channel. - a housing, comprising several housing sections (5 to 9) in a conveying direction of a plastic material to be processed arranged one after the other and connected with each other, - at least one housing bore (11, 12) formed in the housing, - a supply opening opening into the at least one housing bore (11, 12) for supplying the plastic material, - at least one treatment element shaft (13, 14), -- arranged in the associated housing bore (11, 12) and rotatably drivable about an associated axis of rotation (16, 17), and -- comprising several treatment elements (32 to 37, 32' to 37') for treating the plastic material, arranged in a torque-proof way on at least one associated shaft (30, 31) one after the other in the conveying direction, wherein at least one treatment element (33, 33') is formed from an electrically conductive material (M 3) at least in part in a heating zone -- arranged in the associated housing bore (11, 12) and rotatably drivable about an associated axis of rotation (16, 17), and -- comprising several treatment elements (32 to 37, 32' to 37') for treating the plastic material, arranged in a torque-proof way on at least one associated shaft (30, 31) one after the other in the conveying direction, wherein at least one treatment element (33, 33') is formed from an electrically conductive material (M 3) at least in part in a heating zone - at least one coil of the inductive heating device surrounds the at least one treatment element shaft (13, 14) and the at least one treatment elements shaft (13, 14) is arranged in an interior of the at least one coil, - at least one housing section is made from an electromagnetic transparent material (M 4) at least in part in the heating zone such that an inner sleeve arranged in the interior is exclusively made from the electromagnetic transparent material (M 4), wherein the electromagnetic transparent material (M 4) is nonmagnetic and not electrically conductive, and - the at least one coil is coolable with a cooling means, wherein -- the at least one coil forms a cooling channel or -- the inner sleeve entirely delimits a receiving space, in which the at least one coil is arranged, and the receiving space serves as a cooling channel. -- the at least one coil forms a cooling channel or -- the inner sleeve entirely delimits a receiving space, in which the at least one coil is arranged, and the receiving space serves as a cooling channel.