FI105937B - Method and device concept for cutting and pulling the tip strip in a paper web / cardboard web at the end of the drying section of the paper machine / board machine - Google Patents

Description

105937

METHOD AND APPARATUS CONCEPT FOR CUTTING AND EXPORTING THE PAPER / PAPERBOARD TAPE TAPE AND EXPORTING AT THE END OF THE PAPER / PAPERBOARD DRYING FABRIC

The present invention relates to a method and a device concept for cutting and exporting a paper web / board webbing tongue strip at the end 10 of a paper machine / board machine dryer.

The so-called prior art is known from the prior art. Tail Shooters, a device solution where, after cutting the strap, separate strokes are used to guide the strap freely between the ropes to form a rope rope and move it forward in the paper machine. 15 The said Tail Shooter apparatus thus picks up the end-strip from the scraper of the last dryer cylinder and shoots it through the pick-up plate and the export plate. For different paper grades, this threading blowing rope reel requires different setpoints. In order to avoid the above problem, this application proposes a new type of thread at the end of the drying section.

20

It is also known in the art to provide various thread-pulling devices for scraping a web from scrapers. The aforementioned devices use a mechanical strap cutter in combination with different types of blowing or strap transfer device. Such a transfer device may further be based on vacuum sucked under the head strap. Generally, all of the devices for extracting the headband from the scratches have the problem of looseness on the tape, which requires a greater speed difference between the drying section and the next unit during the threading. Ko. the speed difference must therefore be reduced when the tape is sufficiently tightened, • '- otherwise the tape will break.

In this application, it is proposed that the tailing strap be cut at the end of the drying section by a cutter, most preferably a water cutter, before the last drying cylinder. The formed threading strap is transferred to the upper drying cylinder and, by means of separate blows, is guided to the lower position by the so-called suction cylinder located therein. Vac roll. The Vac roller is a cylinder structure having a vacuum exerted through an interior space free of suction boxes to the entire interior of the cylinder and further through the perforation of the cylinder jacket to the grooves on the cylinder surface to which the holes 5 through one end of the cylinder end. Preferably, the grooves are annular grooves extending circumferentially on the surface of the cylinder. In this way, the web is held in contact with the wire surface by means of a vacuum applied across the wire.

In the solution of the invention, when the threading strap comes from the upper drying cylinder-10 blades K4 to the suction cylinder S2 below, the passage of the threading strap as described above is supported by applying a blow to the threading strap and pressing it against the wire surface. In connection with the suction cylinder, the threading strap is attached to the wire threaded on the suction cylinder. Preferably, the threading strap is further upwardly supported by the air blades on the guide roll E. The lead roll is preceded by a rope outlet, and the rope lead 15 is preferably located in connection with the guide roll so that the gap between the rope leading ropes is on the inlet side of roll E. still between the ropes, forward for example to the winder F.

In the structure according to the invention, the guide roll E may also be a roll with a vacuum section and an overpressure section, whereby the rope cable may be located after the aforementioned roll.

In this case, by means of a vacuum section of the guide roll E, the threading strip is picked up from the connection of the wire Hj and conveyed forward by the over-section block of the guide roll E and displaced by a side blast

The process according to the invention for the export of paper and board web threading strips is essentially characterized by what is claimed.

3,105,937

The invention will now be described with reference to certain preferred embodiments of the invention shown in the figures of the accompanying drawings, but which are not intended to be limited thereto.

Figure 1A shows an embodiment of the invention wherein the drying section concept comprises forming and moving the threading strap according to the invention forward and out of the connection of the drying cylinder group.

Fig. 1B shows a section of the tapping thread before the drying cylinder Kj.

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Figure 1C shows the transition of the threading strap to the guide roller E.

Fig. 1D shows the support blowing of the threading ribbon with an air jet Lj produced from a scraper bar located below the position of the drying cylinder K4. Figure 15 further illustrates a fan beam located on the other side of the wire, whereby the blowing effect is applied to create a vacuum on the wire side in question and to apply a holding force known per se to the threading strap through the wire.

Figure IE shows blasting of the threading strap just before wiring 20a.

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Fig. 1F shows the formation of a rope barrier in front of the guide roller E.

Fig. 2 shows an embodiment similar to Fig. 1A but with the suction cylinders 25 and the drying cylinders in an inverted position with respect to Fig. 1A; suction cylinders are located. above and the drying cylinders in the group below.

Figure 3 illustrates an embodiment of the invention in which the web is conveyed in a manner similar to that of the preceding embodiments except that in this 30 embodiment the guide roll E comprises vacuum and overpressure blocks and a perforation therethrough, whereby suction applied through the vacuum block and by blowing with an overpressure block to remove the headband from the guide roll E so that it can be moved by means of a side blow after the lead roll E to the rope entry Cj to form the rope t1, then the rope guide 5 through the rope slots.

Figure 4 shows an embodiment of the invention in which the guide roll E is conventional and the wire is passed through the guide roll to the wire guide roll D. The threading strap is supported in the wire run between the guide roll E and the wire guide roll D by holding it under vacuum at the lower surface of the wire. After the guide roll D, the web is moved between the ropes T1 and T2 and forward to, for example, a reel. The threading strap 20 may also be guided as a cordless export so that it is guided to the reel, supported by blows, from the wire guide roll D.

Figure 5A is a partial view illustrating a guide roller E.

Fig. 5B shows an embodiment comprising a vacuum and an overpressure block of a guide roll Ejq.

Fig. 5C shows another embodiment of the conveyor roll E20 and the threading strap.

Figure 1A shows a first preferred embodiment of the invention. The last drying cylinder group of the drying section 100 shown in the figure comprises the drying cylinders 25 K2.K2.K3 and K4. Suction cylinders Sj and S2, i.e. so-called. Vac rollers, located in positions below as shown in the figure. The second drying cylinder K2 is located in the structure just below the level of the suction cylinders. The web W is led to the first drying cylinder Kj of said drying cylinder group Rjj. The wire H is guided to the drying cylinder Kj in its upper position and along the surface of the drying cylinder to the wire guide roll Dj 30 between the drying cylinders Kj and K3 and further to the drying cylinder K3 and thence to the suction cylinders Sj and forward in the group.

5, 105937

The paper / board web W is guided from the drying cylinder Kj to the drying cylinder K2 below which, when pressed, it passes supported by an external wire H2 passed through guide rollers gj, g2 and. From the drying cylinder K2, the web W is led to a nip between the drying cylinder K3 and the wire Hj, from which the web is guided to the lower suction cylinder S j, whereupon the surface is retained by the vacuum created within the suction cylinder S j. Preferably, the suction cylinder Sj comprises grooves on its surface to which the diaphragm holes end, thereby exerting a greater circumferential gripping force on the exteriorly guided web W. From suction cylinder Sj, web W is passed along than the suction cylinder Sj described above. From the suction cylinder S2, the web is further guided to the paper guide roller E and further to the reel F. Naturally, the last group of the drying section may also be entirely 1-wire.

15

The preferred threading arrangement of the invention shown in Fig. 1A comprises: f in the position of the cutter 10, preferably the liquid cutter and most preferably the water cutter, between the suction cylinder Sj and the drying cylinder K4. The threading strap 20 is thus cut at position B j by a cutter 10. The cutter 10 is thus preferably a liquid cutter and most preferably a water cutter 20. It produces a pressurized water jet on the surface of the web to be cut. The web portion adjacent to the peripheral nanotape is transferred to the pulper after cylinder K4 by a scraper 11 having a blade 11a arranged to press against the underside of the drying cylinder K4. An air jet Lj, so-called "air jet", introduced from the blower nozzle 11 connection from the blow nozzle 50. a scraper jet and a blow bar 12, known per se, on the other side of the wire Hj to create a negative pressure on that wire side, further support the passage of the threading band 20. . to a suction cylinder S2, by means of which a cutter 10, preferably a liquid cutter, under vacuum. the cut tongue strap is further conveyed along the surface of the suction cylinder S2 and air-blown (FIG. Rope 6 105937

Tj and T2 run the cableway all the way to the reel F. The threading strap 20 is thus conveyed between the ropes T1 and T2 up to the reel F.

Fig. 1B shows in more detail the position Bj 5 of the water cutter according to the invention between the suction cylinder Sj and the drying cylinder K4. The threading ribbon 20 is cut as shown in Fig. 1B with a water cutter 10. The threading ribbon 20 is illustrated as illustrated in Fig. 1C on the drying cylinder K4 and further to the suction cylinder S2 below and further to the paper guide roller E.

Figure ID illustrates in more detail the aforementioned threading conducting. When the shear at position Bj has taken place, the threading strap 20 is carried along with the wire Hj to and above the drying cylinder K4, whereby an air jet Lj is applied to the surface of the threading strap through the blower nozzle SO to press it against the wire Hj. The blow box or suction box 12 provides a vacuum 15 on the other side of the wire H and thereby aids the passage of the thread 20 in the vacuum. The track itself adjacent the threading strap 20 is guided down from the last dryer cylinder K4 between the last dryer cylinder K4 and the last suction cylinder S2. Preferably, on the other side of the wire there is a blowing beam 12 through which an air jet is provided along the surface of the wire Hj and further through which a negative pressure is applied to the wire side in question. Thus, the holding force, i.e. the holding force through the wire Hj, is further applied by means of vacuum to the threading belt 20. The vacuum threading S2 1 ' blown by means of a separate blow nozzle 21 25. The blowing air jet I> 2 moves the headband 20 to the side of the rope guide Tj ^ relative to the longitudinal direction of the machine.

Fig. IE illustrates an embodiment of the transfer of an edge band rope c, associated with the construction of Fig. 1A. The air blast L2 is applied from the blast tube 21 to the headband 30 tin strip 20 from the center of the machine web run sideways. Hereby, the threading strap 20 is laterally displaced to the pivot C between the ropes 11, 22 shown in Figure 1F and further to the paper guide roller E and further up to the reel, carried by the rope path Tj, T2 between the ropes Tj and T2. Figure 1F shows the formation of rope bar C by ropes T1 and T2.

Figure 2 shows an alternative drying cylinder concept which otherwise corresponds to that of Figure 1A but with a different location of the drying cylinders and suction cylinders. The suction cylinders Sj and S2 are located above and the drying cylinders Kj.K2.K3 and K4 are located below them. Incidentally, the export arrangement of the cutting and rope sheave C of the threading ribbon is the same as that of the embodiment of Figure IA.

10

Figure 3 illustrates an embodiment of the invention in which the paper guide roller Ejq is provided with an internal vacuum section or vacuum sector and an internal vacuum section (relative to the web travel direction) overpressure sector. In this embodiment, the paper guide roll comprises a perforation in the roll sheath through which the IS is applied to either the overpressure or the underpressure (depending on the block) on the threading strip 20. The underpressure, pressure block and overpressure block may be located at the end of the paper guide roll. Of course, it is also possible to have an embodiment in which the entire paper guide roll is provided with a vacuum block and a pressure block throughout its length.

In the embodiment of Fig. 3, the support arrangement of the cutting and threading strap up to the front of the roll E corresponds to the embodiments of Figs. IA-1F. The embodiment of Fig. 3 differs from the embodiment of Figs. . an overpressure block 23. The threading strip 20 is further forwarded from said paper guide roll Ejq comprising said pressure system to the rope outlet Tj, T2 located downstream of the overpressure zone of said paper guide roll Ejq. In this arrangement, the blowing sector is so located that said blowing, in addition to removing the threading strap, also prevents the strap, or, if the blowing is extended over the entire roll, also rotating the web around the paper guide roll Ejq.

8 105937

Fig. 4 illustrates an embodiment of the invention which otherwise corresponds to the embodiment of Figs. IA-1F, but in which the wire Hj is further guided from the paper guide roll Ejq to the wire guide roll D. In this embodiment, the wire Hj is between wire Hj.

In this case, the threading strap 20 also moves from the suction cylinder or Vac roll S2 to the friction between the paper guide roll E20 and the wire Hj and further along the surface of the wire Hj to the vacuum , which prevents the paper web 10 from winding around the paper guide roller Ejq. The separate rope passage Tj, T2 may be located near the wire guide roller D or the headband may be guided forward by the support blows provided by the blow nozzles, whereby, for example, in the final stage, the head lead may be so-called. cordless head.

Fig. 5A illustrates an axonometric partial sectional view r for rotating a bearing guide roll E. The roll E comprises bearings on which it is mounted (e). The roll shell E 'is connected to the axes hj and l ^ on which the roll E rotates.

Figure 5B shows an embodiment of a guide roll Ejq. In the embodiment of Fig. 5B, the guide roll Ejq comprises at its end a vacuum section 22 and an overpressure section 23. The blocks are formed by partitions 100,101,102 and 104 and the roll shell Ejq 'comprises at least a region of block surface area perforations thereof through the perforations 103 detachable blowing in accordance with the block to the threading strap.

The roller sheath comprising the perforation is connected to the axes nj, ^, which are mounted on bearings G1 and G2. The blocks 22 and 23 are formed in the embodiment of Figure 5B at the m: · end of the roll. It is also possible to have an embodiment in which the blocks 22 and 23 are formed over the entire roll.

Figure 5C shows an embodiment of a guide roll E2Q. As shown in the figure, the guide roll E2Q is similar in construction to the lead roll Ejq. As shown in the figure, the threading strap extends between the wire H and the surface of the roll shell E ^ q 'of the guide roll E20, and forward, for example, by means of the negative pressure exerted on one side of the wire. The vacuum, as shown in the figure, is produced by means of a blow box 25 known per se.

9 105937 • <

Claims (17)

105937 A method of cutting and exporting a paper web / board web threading strip (20) in a final dryer cylinder group (Rjj) of a paper machine / board dryer, wherein the paper or board web (W) is guided through drying cylinders (Kj, K2 ..) and suction. Sj ..), looping forward, whereby the last dryer cylinder (K4) of the drying cylinder group (Rjj) is followed by a suction cylinder (S2) through which the wire and web pass in running condition, characterized in that the threading belt (20) is cut ) the last dry 10 ink cylinders (K4) and that the threading strip (20) after the cut is led to said drying cylinder (K4) and further from the drying cylinder (K4) to the suction cylinder (S2), in that web / wire feed, and that the suction cylinder (S2) 20) is moved forward to the guide roller (E.Ejq ^ q) and that, in the threading, the portion adjacent the threading strap 15 is lowered before the last suction roll (S2). e e m r r I r t Method according to Claim 1, characterized in that the method uses a water cutter (20) and that the web portion, i.e. the web adjacent to the headband, is lowered before the last suction cylinder (S2) or so-called. Vac-rolls. 20 Method according to Claim 1 or 2, characterized in that in the method the threading strap (20) is guided between the last suction cylinder (S2) and the guide roll (E) such that the threading strap (20) is displaced by air blowing (L2) to the front of the rope outlet (T ^^) by means of the rope reel (C) and further by means of the rope outlet (1 ^, T2) out of the connection of the drying cylinder group (R ^) to, for example, a reel (F). Method according to claim 1 or 2, characterized in that the guide roll (E10) comprises a vacuum section (22) and an overpressure section (23), wherein the vacuum section (22) 30 secures the threading strip (20) to the roll casing (Ejq '). and detaching it from the guide roll (E) by means of an overpressure block (23). 105937 A method according to the preceding claim, characterized in that the threading strap (20) is moved by a rope reel (C) and a rope passage (T}, T2) downstream of the cable roll (Ejq). Method according to claim 1 or 2, characterized in that the wire (Hj) passes along the surface of the guide roll (E20) and is folded further to the wire guide roll (D), whereby the threading strip (20) is transferred from the suction cylinder (S2) to (Hj) and further supported by vacuum and / or suction along the lower surface of the wire (Hj) and with the wire to the wire guide roll (D). 10 A method according to the preceding claim, characterized in that the wire guide roll (D) is provided with a rope sheave (C) of the rope feed (Tj, T2), the rope sheath (20) being moved by the rope sheath (20) and further by the rope feed (T1J2). ), for example, to the scroll wheel (F). 15 A method according to claim 6, characterized in that the thread guide strip (20) is moved forward from the wire guide roller (D) by means of a so-called. cordless headache. A device concept for cutting the paper / board web threading strip in the last dryer cylinder group (R 1) of the dryer section of a paper machine / board machine, wherein in the device concept the web is passed through a hole whereby the web is held in contact with the suction cylinder (S1, S2 ...) by means of a vacuum applied to the suction cylinder, whereby the last drying cylinder (K4) of the drying cylinder-group (R1) is followed by a suction cylinder (S2). and the web in running condition, characterized in that the apparatus comprises, prior to the last drying cylinder (K4) of the drying cylinder group (Rn), a wire and web run between the cutter, suction cylinder (Sj) and said drying cylinder (K4) and ) in the area between means (50,12) for supporting and / or guiding the threading strap (20) with the wire and that the device concept supports the cut threading strap (20) as it moves from the drying cylinder 105937 blades (K4) to the last suction cylinder (S2); guide roll (E.Ejq ^ q). to which the threading strap is moved from the suction cylinder (S2) and there is a device arrangement so that, in the head stroke, the portion adjacent to the threading strap is lowered down before the last suction roll (S2). 5 Device concept according to Claim 9, characterized in that the devices (50,12) in the region between the drying cylinder (K4) and the suction cylinder (S2) for supporting the threading strap (20) comprise an air blast (Lj) producing an orifice (50) and / or means behind the wire, preferably a suction or blow box (12), wherein the air blowing (Lj) and / or vacuum generating means support and / or guide the cut to the threading strip in the region between the drying cylinder (K4) and the suction cylinder (S2). Device concept according to Claim 9 or 10, characterized in that the cutter (10) is a liquid cutter and most preferably a water cutter. Device concept according to Claim 9, 10 or 11, characterized in that the guide roll (E) comprises, on its front side, a rope grommet (C 1) of rope feed (T 1), with means for applying transfer blowing (L2) to the threading strap. T j, Ύ ^) rope spool (C) and that rope spool (C) is in front of the guide roll (E). Device concept according to Claim 9,10 or 11, characterized in that the guide roll (Ejq) comprises a vacuum section (22) and an overpressure section (23), whereby the vacuum section 25 and the perforation (103) of the roll shell (E the tensioning strap (20) - the retaining force and, through the overpressure block (23) and the perforation of the sheath, is subjected to an overpressure to release the tensioning strap (20) from the roll (Ejg). A device concept according to the preceding claim, characterized in that the rope fence (Q) of the ropes (Tj ^) is located immediately after the guide roll (Ejq). Device concept according to claim 9,10 or 11, characterized in that the guide roll (E) folds the wire to the wire guide roll (D), whereby the web is transferred from the cylinder (S2) to the guide roll (E20) » ') between the surface and the wire (Hj) and passes from the guide roll (E20) to the wire guide roll (D), whereby in the passage between the 5 wire guide rollers (D) and the guide roll (E20), the web is held on the wire surface by 20) with targeted support blows. Apparatus according to the preceding claim, characterized in that the rope guide (C) of the cable entry (Tj ^) is located after the wire guide roll (D). Device concept according to Claim 15, characterized in that the threading guide control apparatus after the wire guide roll (D) is cordless. 15 • w m 105937