A screening device for fibrous stock suspensions of the paper industry includes at least two separate screening baskets which are connected axially behind one another in the interior of a reinforcing device in the form of a back-up cylinder. A variable-diameter intermediate ring is arranged between the screening baskets. The reinforcing device has a cover part and a bottom part. By way of axial tensile force loading of the arrangement, the intermediate ring is loaded so as to bear radially in the circumferential direction in a gap-free manner against the associated axial ends or screening basket flanges of the screening baskets. The screening baskets are then clamped and fixed in a centrally positioned manner by the intermediate ring in cooperation with the end-side flange of the reinforcing device, the cover part, the bottom part and the intermediate ring.

A method for producing a screening device, the method comprising the steps of providing a screening device that includes a plurality of profiled bars and a plurality of bar holder packages associated with the plurality of profiled bars. The plurality of bar holder packages include a plurality of first bar holders and at least one additional bar holder associated with the plurality of first bar holders. The method including the further steps of inserting the plurality of profiled bars parallel to one another into the plurality of bar holder packages, and bending the plurality of bar holder packages such that the plurality of first bar holders and the at least one additional bar holder are bent at the same time.

A method for producing a screening device, the method comprising the steps of providing a screening device that includes a plurality of profiled bars and a plurality of bar holder packages associated with the plurality of profiled bars. The plurality of bar holder packages include a plurality of first bar holders and at least one additional bar holder associated with the plurality of first bar holders. The method including the further steps of inserting the plurality of profiled bars parallel to one another into the plurality of bar holder packages, and bending the plurality of bar holder packages such that the plurality of first bar holders and the at least one additional bar holder are bent at the same time.

A screen cylinder includes a cylindrical screening media having an inflow side and an outflow side. The screening media is formed of a plurality of circumferentially spaced an axially extending wedgewire bars, which have an inflow surface facing the inflow side. The axially extending wedgewire bars have a profile shape optimized to apply a spray on wear resistant coating on their inflow surface.

A screen cylinder includes a cylindrical screening media having an inflow side and an outflow side. The screening media is formed of a plurality of circumferentially spaced an axially extending wedgewire bars, which have an inflow surface facing the inflow side. The axially extending wedgewire bars have a profile shape optimized to apply a spray on wear resistant coating on their inflow surface.

A screen cylinder includes a cylindrical screening media having an inflow side and an outflow side. The screening media is formed of a plurality of circumferentially spaced and axially extending wedgewire bars, which have an inflow surface facing the inflow side. The axially extending wedgewire bars have a wear resistant coating on their inflow surface. The wear resistant coating is substantially uniform in thickness on the inflow surface at individual axial locations but thicker on the bars on the inflow surface towards the outflow end of the screening media compared to the wear resistant coating located on the bars towards the inflow end of the screening media.

A screen cylinder includes a cylindrical screening media having an inflow side and an outflow side. The screening media is formed of a plurality of circumferentially spaced and axially extending wedgewire bars, which have an inflow surface facing the inflow side. The axially extending wedgewire bars have a wear resistant coating on their inflow surface. The wear resistant coating is substantially uniform in thickness on the inflow surface at individual axial locations but thicker on the bars on the inflow surface towards the outflow end of the screening media compared to the wear resistant coating located on the bars towards the inflow end of the screening media.

A screen cylinder includes a profiled bars aligned longitudinally and coupled to at least one support ring. Each of the profiled bars includes an outer surface facing away from the support ring, a first slot surface extending from the outer surface to the attachment end, and a second slot surface opposite the first slot surface and extending from the outer surface to the attachment end of the profiled bar. The first slot surface of one profiled bar and the second slot surface of another immediately adjacent profiled bar define a slot. The profiled bars include a hardened layer integral with or disposed on at least a portion of the first slot surface of the profiled bar. The hardened layer may have a Vickers hardness greater than the hardness of the base metal.

A screen cylinder includes a profiled bars aligned longitudinally and coupled to at least one support ring. Each of the profiled bars includes an outer surface facing away from the support ring, a first slot surface extending from the outer surface to the attachment end, and a second slot surface opposite the first slot surface and extending from the outer surface to the attachment end of the profiled bar. The first slot surface of one profiled bar and the second slot surface of another immediately adjacent profiled bar define a slot. The profiled bars include a hardened layer integral with or disposed on at least a portion of the first slot surface of the profiled bar. The hardened layer may have a Vickers hardness greater than the hardness of the base metal.

Disclosed is a refiner filling piece for a refiner having a rotor that rotates about an axis of rotation and cooperates with a stator to mechanically treat a pulp containing cellulosic fibers. The refiner filling piece is mountable to the rotor or the stator. The refiner filling piece comprises a base and a plurality of spaced-apart refiner bars, each refiner bar being defined by a bar length and a bar height. At least some of the refiner bars have a surface coated with a variable coating. The surface having the variable coating may be the leading surface of the bar.