Abstract:
A trash conveyor (21) has thin upstanding right triangular teeth (23) mounted parallel to their direction of motion. A pivoting deck (25) is positioned over the conveyor and has fixed isosceles-triangular teeth (27) which interdigitate with the teeth on the conveyor. The deck is angled upwardly towards trash infeed end of the conveyor. The deck is suspended by four pivot arms (68) arranged in a rectangular pattern which allow the deck to pivot up and in the direction of the motion of the conveyor. Rows of teeth attached to the deck are offset from previous rows so that the spaces between the teeth on the deck and the teeth on the conveyor vary as the teeth on the conveyor move under the deck. A blade cleaner (122) and conveyor (136) is located beneath the trash conveyor which removes plastics bags from the teeth of the trash conveyor and rolls them into compact shapes to facilitate disposal for recycling.
Abstract:
A controlled crown roll utilizes a crown support piston (76) with a glide shoe (78) with a cavity (80) in the face of the glide shoe centered under the nip loading line. The cavity is surrounded by a land area (83), the majority of which is located away from the nip load. Use of a low viscosity hydraulic fluid, for example, 15.6 cP, with a hydraulic film thickness of 0.002 inches, results in significantly lower friction between the glide shoe and the interior surface (40) of the rotating mantle. Recesses in the piston sides form hydrostatic thrust bearings (82) which perform the centering function for the piston and the glide shoe.
Abstract:
A press apparatus (10) is disclosed for a paper making machine for pressing a web (12). The apparatus (10) includes a frame (14) and an extended nip module (16) which is removably connected to the frame (14). A backing roll (18) is disposed beneath the module (16) and is removably connected to the frame (14). The backing roll (18) cooperates with the module (16) for defining therebetween an elongate press nip (20) for the passage therethrough of the web (12). A felt (22) extends through the press nip (20) for receiving water ejected from the web (12) during passage of the web (12) and felt (22) therethrough. A looped bearing blanket (24) extends around the module (16), the arrangement being such that the blanket (24) is disposed between the module (16) and the felt (22) during passage of the blanket (24) through the press nip (20). A positioning device (26) is disposed above the module (16), and selectively connected to the module (16) adjacent to a first location (28). The positioning device (26), when connected to the module (16), permits movement of the module (16) away from the backing roll (18). A link device (30) selectively extends between the frame (14) and a second location (32) adjacent to the module. The first and second locations (28, 32) are spaced relative to each other. The arrangement is such that when the positioning device (26) is connected to the module (16) and in a first disposition thereof, and the link device (30) extends between the frame (14) and the second location (32), the module (16) is urged towards the backing roll (18) for defining therebetween the press nip (20). When the positioning means (26) is in the second disposition thereof, and the link device (30) extends between the frame (14) and the second location (32), the module (16) is moved away from the backing roll (18) for facilitating removal and installation of the felt (22). When the link device (30) is selectively disconnected from the second location (32) and the positioning device (26) is in a third disposition thereof, the module (16) is suspended by the positioning device (26) for facilitating removal and installation of the bearing blanket (24). When the positioning device (26) is selectively disconnected from the first location (28), removal and installation of the module (16) is facilitated. When the positioning device (26) is in the second disposition thereof, and the link device (30) extends between the frame (14) and the second location (32) with the felt (22) removed, removal and installation of the backing roll (18) is facilitated.
Abstract:
Rider roll arrangement, in order to weight at least one winding (29) of a material in the form of a web which is supported during winding in a winding device, having a rider roll, which comprises a multitude of weighting rollers (2, 2') mounted by means of brackets (10) to a support beam (1), with each weighting roller (2, 2') comprising a means for a hydraulic pressing against and a means for a pneumatic lifting away from at least one winding, characterized in that the means for pressing or lifting respectively are combined in one piston/cylinder unit (4) acting in two directions and are arranged in the interior of each weighting roller (2, 2'). Due to said arrangement, the building space is minimal and it is especially simple to exchange the weighting rollers by means of detaching the brackets from the support beam.
Abstract:
In a twin wire former (20) a headbox (30) injects stock onto a forming wire (22) with which a second forming wire (24) is brought into gradual engagement. A forming shoe (40) directs the two wires along a path of increasing curvature, above which water is drained by adjustable auto slices (44, 46). The two wires (22, 24) with the web (34) therebetween then follow an oscillating S-shaped path between seven S-rolls (52) and are directed upwardly through three individually loaded press rolls (58) with increasing pressure to about four hundred and fifty pounds per linear inch at the last wet press. Drainage pans (83) collect water from the upper surface of the twin wires and water thrown off the upper press rolls. The press rolls are individually pneumatically pivotable to increase nip pressure, and collectively pivotable to open all the nips. Next a high pressure dry nip (80) can increase the fiber content of the web (34) to thirty-five percent fiber.
Abstract:
The invention relates to a device for measuring the surface hardness of rolls (2) of paper or other material. Said device comprises at least one hardness measuring head (12) with at least one rotatably mounted contact roll to rest, under radial pressure, on the revolving roll (2) of paper or the like. The hardness measuring head (12) can be moved on a rail (11) substantially parallel to the winding axis of the roll (2) or the like and has means for evaluating the measuring signals of the hardness measuring head (12). It is proposed to provide first and second means to monitor and, optionally, influence parameters of a material strip wound to form the roll, such as roll hardness, strip tension, uniformity of roll diameter along the roll width and the like, during winding. Said means can be used to hold at least one of the contact rolls (126, 127; 126', 126'', 127'') in position on the roll (2) with a first force and to cause at least one of the contact rolls (126, 127; 127', 127'') to penetrate with a second force deeper into the surface than with the first force.
Abstract:
A coater head (22) is positioned beneath a backing roll (24) and has a housing divided into three sections (25, 27, 41). A first coating pond (28) is defined between an overflow barrier and a first wall (33). A converging plate (32) extends between the first wall (33) and a second wall (35), and converges toward the web, and a second pond (43) is defined between the plate and an end wall (39). Coating is introduced to both ponds. A low pressure cavity (37) is defined beneath the converging plate (32) and between the first wall (33) and the second wall (35). The cavity (37) opens (72) to the second pond (43), and draws air and excess coating from the second pond (43). The web is prewetted as it passes through the first pond (28), and coating deprived of entrained air is applied to the web in the second pond (43). Coat weight uniformity and increased machine speeds are thus achievable.
Abstract:
A uniform film of coating is delivered onto a substrate such as paper, felts and blankets by a film applicator (20; 100; 120; 142) which has a static converging wedge (32; 88; 108; 128; 150), an adjustable converging wedge (33), and an extraction channel (45; 92, 112; 132; 154) located between the two wedges. As a unit, the film applicator minimizes the hydrodynamic flow instabilities, as well as reduces flow variations associated with a nonuniform feed and a dynamic contact line. The film applicator also removes entrained air and excess coating from the application zone in order to improve the flow stability and machine runnability.
Abstract:
A paper drying section utilizes two reversing rolls (26, 28) between each dryer roll (22, 24) to extend the available time for vapor to flash from the web. A vacuum box is disposed between the two reversing rolls to support and dry the felt and paper web as it passes from one reversing roll to another. An air cap is used to blow high velocity air onto the exposed surface of the paper web which is held by the vacuum box. The spacing of the two reversing rolls increases the wrap of the single tier dryer by approximately twenty percent over that of a conventional single tier dryer with a single reversing roll. Another configuration dryer section positions the first of the two reversing rolls downwardly beneath its adjacent dryer roll creating a long draw between the dryer roll and the first reversing roll. This long draw is supported by a vacuum box adjacent the felt. The downward positioning of the first roll increases the length of the draw between the first and second reversing rolls, providing additional area for drying by an air cap.
Abstract:
A coating apparatus (10) is disclosed for coating a web of paper (W). The apparatus (10) includes a first and second roll (12, 14) having axes of rotation (16, 18) disposed parallel relative to each other such that the rolls (12, 14) define therebetween a first nip (N1) for the selective passage therethrough of the web (W). A backing roll (20) has a peripheral suface (22) which cooperates with the first roll (12) for defining therebetween a second nip (N2). A coater (24) cooperates with the peripheral surface (22) for applying coating material to the web (W) when the web(W) is guided by the surface (22) and disposed between the surface (22) and the coater (24). A further backing roll (26) has a further peripheral surface (28) which cooperates with the second roll (14) for defining therebetween a third nip (N3). A further coater (30) cooperates with the further surface (28) for applying coating material to the web (W) when the web (W) is guided by the further surface (28) and disposed between the further surface (28) and the further coater (30). The arrangement is such that the web (W) in a first coating mode is guided by the surface (22) for coating a first side (32) of the web (W), and in a second mode, the web (W) is guided by the further surface (28) for coating a second side (34) of the web (W), and in a third mode, the web (W) is guided through the first nip (N1) for simultaneously coating the first and second sides (32, 34) of the web (W).