Abstract: A blade system for a scraped surface heat exchanger includes a number of blade rows which each consists of a number of successively arranged blade scrapers (1) mounted in cut-outs (15) in the surface of a rotor (4) which is mounted in a heating/refrigerating chamber (20) in the heat exchanger. The individual blades, at the edge closest to the inner wall (21) of the chamber (20) are provided with a knife edge (2) and at the edge facing the rotor (4) with a basis (3). The blades are being provided with flaps (8) which are bent in the direction towards the rotational axis of the rotor (4), while elements (9) on the rotor (4) form abutments for the flaps (8) and engagement members (10) for receiving the basis (3) of the blades so as to permit removal of the blades from the heat exchanger without simultaneously dismounting the rotor (4).

Abstract: A method of cutting pieces of an extruded substance and depositing the pieces on individual wrapping sheets which are being conveyed in the same direction and at the same velocity as the extruded substance is disclosed. The wrapping sheets are fed in an overlapped fashion to the point where the cut off extruded piece is placed onto a wrapping sheet and the conveyor under the sheet onto which the cut piece is being placed is accelerated so that the sheet is disengaged from the overlap with the succeeding sheet immediately before the next cut piece is to be placed onto the next following sheet. An apparatus is disclosed with means necessary for carrying out the method.