Abstract:
An apparatus and method for cross-cutting a traveling web (W) of material, such as paper, while winding the traveling web into successive rolls of a specified diameter includes a laser (48), a pair of spaced adhesive applicators (40, 40') and energy means (44) for activating the adhesive (46) to change it from an essentially inert to a web adhesive state. A pair of horizontally arrayed drums (12, 14) support a core (26) on which the traveling web (W) is wound. Upstream of the core (26), over the lower periphery of one of the drums (12, 14), the on-coming web has its drum-supported surface exposed to a transversely moveable laser (48) which cuts the web transversely to its direction of travel. Upstream of the transversely actuated laser (48) are a pair of adhesive applicator nozzles (40, 40') which are spaced in the web travelling direction and movable transversely with the laser (48). An energy means (44) is mounted between the adhesive nozzles (40, 40') and laser (48) to activate the adhesive sprayed by the nozzles. The travelling web can, thus, be severed by the laser (48) and have its trailing edge glued to the web roll being wound while the leading edge of the severed web can be glued to a new core inserted in the winder between the drums (12, 14).
Abstract:
A pressurized dynamic pulp washer (100) in which stock is driven along a stationary wash wire (160) and pulses are generated in the stock to urge liquid through openings in the wash wire. Wash liquid is introduced countercurrent to the flow of stock, and localized mixing and reslurrying occurs.
Abstract:
Process and device for cutting off material in web form in doubling roll-type reel cutters. A wide web (12) of paper or the like is wound off a wide roll (11) in a take-off station (10). The wide web (12) is divided lengthwise into at least two narrower partial webs (24) in a cutting station (20). The narrower partial webs (24) are wound up in two take-up stations (40, 50) consisting of at least one take-up device (41, 51) arranged on either side of the doubling rolls (30,; 30, 30'). On completion of take-up, the partial webs (24) are each cut off perpendicular to the length of the web on the section between the doubling rolls (30; 30, 30') and each of the already wound partial web rolls (25) by means of a knife (61) which can be moved along the cutting line. The cutting-off device (60) used for this purpose has a single knife guide (62). The knife guide can be swivelled about the doubling roll(s) (30) along a line (63), preferably an arc of a circle, and the swivelling path passes through both cutting-off positions. First, the knife guide is swivelled into the first cutting-off position and from there into the second cutting-off position; the knife guide is then swivelled back into the starting position.
Abstract:
An improved screen plate for a pressure screening apparatus and a method for making the basket are disclosed wherein prestressed areas are provided at each end of each slot formed in the screen plate for minimizing crack propagation.
Abstract:
A dryer drum for drying bulk material including a rotating drum (10) having an inlet (12) for material to be dried at one end and an outlet (13) for dried material at the other end, a center shaft (11) extending therethrough, vanes (19, 20, 23, 24) mounted on the shaft (11) circumferentially spaced from each other and axially spaced along the shaft (11), the vanes (19, 20, 23, 24) having a first panel (26) extending substantially in a radial plane parallel to the axis of the shaft (11), a second panel (27) attached to the first panel (26) and facing in a downstream direction and a third panel (29) attached to the second panel (27); wherein the bulk material to be dried moves in sliding movement over the panels (26, 27, 29) and is mechanically conveyed toward the dryer inlet (12).
Abstract:
The present invention relates to a press blanket (12) for pressing water from a formed web (W) which extends through an extended nip (N) defined by an elongate press shoe (14) and a cooperating backing roll (16). The blanket (12) includes a single layer (18) of fiber reinforced urethane which defines an endless loop. The layer (18) cooperates with the press shoe (14) and extends through the extended nip (N) for pressing the water from the formed web (W). The single layer (18) has an inner and an outer surface (20, 22) and a first and a second edge zone (24, 26). The inner surface (20) slidably cooperates with the press shoe (14) and is smooth. The inner surface (20) has a diameter which is reproducible to within a predetermined tolerance range. The outer surface (22) defines a plurality of parallel-spaced circumferential grooves (28 to 38) for assisting the drainage of water from the formed web (W) during passage of the web (W) between the outer surface (22) and the backing roll (16). The edge zones (24, 26) are devoid of grooves such that during use of the blanket (12), fracturing of the single layer (18) in the vicinity of the grooves (28 to 38) disposed adjacent to the edge zones (24, 26) is inhibited.
Abstract:
A single tier dryer section apparatus (10) is disclosed for drying a web (W) extending through a paper machine. The apparatus (10) includes a first dryer (12) and a dryer felt (F) extending around the first dryer (12) such that the web (W) is disposed between the felt (F) and the first dryer (12) for drying the web (W). A vacuum transfer roll (14) is disposed downstream relative to the first dryer (12) such that the web (W) and felt (F) extend contiguously from the first dryer (12) to and around the transfer roll (14) so that the felt (F) is disposed between the web (W) and the roll (14) during transit of the web (W) and felt (F) around the roll (14). A second dryer (16) is disposed downstream relative to the transfer roll (14) such that the web (W) and the felt (F) extend contiguously from the transfer roll (14) to and around the second dryer (16) so that the web (W) is disposed between the felt (F) and the second dryer (16) during transit of the web (W) and the felt (F) around the second dryer (16). The transfer roll (14) includes a perforate shell (18) such that when the roll (14) is connected to a source of partial vacuum (20), a partial vacuum is generated within the shell (18) for urging the web (W) into close conformity with the felt (F) and towards the perforate shell (18). The transfer roll (14) is also movable from a first location to a second location. The first location is closely adjacent to the dryers (12, 16) so that the partial vacuum urges the web (W) into conformity with the felt (F) for inhibiting fluttering of the web (W). The second location is farther away from the dryers (12, 16) than the first location so that damage to the first dryer (12) and the roll (14) in the vent of the web (W) wrapping around the first dryer (12) is inhibited.
Abstract:
A tail cutter apparatus is disclosed for cutting a tail from a web (WA) extending through a single tier dryer section (10A). The apparatus (32) includes a dryer (14A) of the drying section (10A) and a felt (F) extending contiguously with the web (WA) around the dryer (14A), the web (WA) being disposed between the felt (F) and the dryer (14A) for drying the web (WA). The further dryer (15A) is disposed downstream relative to the dryer (14A) and the felt (F) and web (WA) extend contiguously around the further dryer (15A) with the web (WA) being disposed between the felt (F) and the further dryer (15A) for further drying the web (WA). A felt roll (34) is disposed downstream relative to the dryer (14A) and upstream relative to the further dryer (15A) for guiding the felt (F) during movement of the felt (F) between the dryer (14A) and the further dryer (15A). A guide roll (36) is disposed downstream relative to the dryer (14A) and upstream relative to the further dryer (15A) for guiding the web (WA) during movement of the web (WA) away from and towards the felt roll (34) such that a first and second open draw (28A, 38) of the web (WA) are defined between the felt roll (34) and the guide roll (36). A tail cutter (30A) is disposed adjacent to one of the open draws (28A, 38) for cutting the tail from the web (WA).
Abstract:
A dryer apparatus is disclosed for drying a web (WI) extending through a dryer section (10I) of a paper machine. The apparatus includes a first and a second dryer (38I, 39I). A dryer felt (52I) movably extends around the dryers (38I, 39I) such that the web (WI) is disposed between the dryers (38I, 39I) and the felt (52I) for drying the web (WI). A vacuum transfer roll (46I) is disposed downstream relative to the first dryer (38I) and upstream relative to the second dryer (39I) such that the web (WI) and the felt (52I) extend around the transfer roll (46I) so that the felt (52I) is disposed between the web (WI) and the transfer roll (46I) when the web (WI) and the felt (52I) move around the transfer roll (46I). A seal device (74) extends between the first and the second dryers (38I, 39I) for reducing a flow of air between the first and the second dryers (38I, 39I) into a pocket (76) defined by the transfer roll (46I) and the felt (52I) extending between the dryers (38I, 39I) and the transfer roll (46I). The transfer roll (46I) includes a perforate shell (80) connected to a source of partial vacuum (78) such that in use of the apparatus, a partial vacuum is generated within the shell (80), for inducing a further partial vacuum within the pocket (76) so that air flows in a direction from the web (WI) towards the felt (52I) for urging the web (WI) into close conformity with the felt (52I) during movement of the web (WI) around the transfer roll (46I) and also during movement of the web (WI) between the dryers (38I, 39I) and the transfer roll (46I).
Abstract:
A process and apparatus for treating waste material (10) wherein the initial processes are performed in the dry stage including a removal of dirt, metallic and glass materials (13, 14, 15, 20, 21, 25), and separation of the dry materials and thereafter passing the materials through a horizontal rotary pulp separating mechanism which delivers to a pulper (30, 31) and to an anaerobic process chamber (44).