Abstract: A pulper for comminuting and suspending fibrous material includes a container and at least one rotor arranged in the container for circulating a fibrous material suspension located on the container and at least one rigid sieve. The rotor at least predominantly passes over the sieve surface which is provided with round sieve openings. As high a throughput as possible and as low an energy consumption as possible are to be achieved by limiting the cross-section of the sieve openings exclusively defined by circle segments.

Abstract: A pulper for comminuting and suspending fibrous material includes a container and at least one rotor arranged in the container for circulating a fibrous material suspension located on the container and at least one rigid sieve. The rotor at least predominantly passes over the sieve surface which is provided with round sieve openings. As high a throughput as possible and as low an energy consumption as possible are to be achieved by limiting the cross-section of the sieve openings exclusively defined by circle segments.

Abstract: Process for manufacturing screens and screens suitable for use in wet screening fibrous paper suspensions, in which the screens include at least one screen plate having a number of sorting apertures. The process includes providing a number of fastening openings in the at least one screen plate, and inserting profiled pieces into the fastening openings. At least a portion of the profiled pieces are arranged to project beyond a screen surface.

Abstract: An apparatus for the comminution of suspended fibre materials is described in which the fibre material is led through milling gaps which are formed between rotor and stator surfaces occupied with milling tools. The rotor which is floatingly journalled at one end has two conical surfaces equipped with milling tools, with the conical surfaces cooperating with complementary counter surfaces of fixed location which are likewise equipped with milling tools to form radially spaced apart milling gaps which extend substantially over the same axial range, or axially sequential conical milling gaps which enlarge in diameter towards the center of the rotor.