FI103683B - Procedure for forming end conveyor belts in the paper machine / cardboard machine chin - Google Patents

Description

103683

Method for forming a threading tape in a paper machine / board machine Förfarande vid bildande av ändföringsband i pappersmask / cardboard mask 5

The invention relates to a method for forming a threading tape in a paper machine / board machine.

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In prior art solutions, a narrow strip is cut at the edge of the web, which is blown or moved by other means to a rope path adjacent the web between the two ropes therein. The cable web guides the web forward through the machine, after which, at that cutting position, the web R can be applied to its original web width.

A problem with the prior art device, especially in the case of coating stations, is that the headband tends to escape from the machine by the action of air currents and partly also through the application rollers. rope export devices. Em. This phenomenon naturally prolongs the threading and reduces the efficiency of the paper machine.

Various dual cutters are known in the context of paper / board processing.

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Such solutions include, for example: 25 WO 92/06913 and US 5,360,179, it is known to use water reeling with a reel to cut the web and create a new head during reel changing.

A: In particular, WO 92/06913 teaches to begin surgery in the center of the lane. Other prior art publications include EPO 067 051, WO 91/03359 and US 5 234 544. From US Patent No. 5,234,549, a cutting apparatus is known using two cutters comprising a mechanical cutting blade. The use of this mechanical device solution significantly limits the placement of the cutting device in the paper machine.

2 103683 This application discloses a method of forming a headband using a double cutter comprising two cutters, either in the same position or in a different position. At least one other cutter which starts cutting from the outside of the web is a liquid cutter. In the most general embodiment of the invention, the first cutter may also be other than a liquid cutter. Preferably both cutters are liquid cutters, most preferably water cutters. In the method of the invention, using a first cutter Cj, first a threading strip A is first formed, followed by a second cutter C2 adjacent said first cut to form an edge strip or edge strip B, and most preferably such second cut f2 By cutting in this way, the tip of the edge band B is sharpened, thereby further obtaining a stepless strip of the actual threading strap A, thereby avoiding the risk of its breaking. Said edge band B may be led to a pulper at a suitable location. The actual threading strap A is then spread by means of both cutters, preferably water cutters, to the center of the machine width, after which, or before said step, the stretching strap A is applied to 1000-2000 mm. The final width of the web is achieved by moving the cutters, preferably water cutters, out of the various edges of the web on both sides of the machine centerline X of the web W.

20 Dual cutting can be applied to papermaking threads in locations where the web; the edge-cut threading strap can be moved to travel substantially to the center or to the center of the machine. Such places include e.g. threading from the front dryer section through the sizer / size press to the after dryer and further through the after dryer, and export from the cylinder dryer or the like through a coating machine.

In the concept and device solution according to the invention, the cutters can be located in the same beam and thus in the same position or completely apart. Hereby, the first cutter Cj making the first cut fj into the web may be located at the beginning of the dryer section and the second cutter C2 making the second cut f2> at the end of the dryer section below the last drying cylinder of the dryer section. 103683 is sufficient for the pulverisers below the cylinder by means of the associated guides / scrapers.

w When using a liquid cutter, preferably a water cutter, the liquid preferably has a water pressure range of 50 to 300 bar. The advantage of water cutting is that the web can be cut against the wire H. Hereby, cutting of the web is possible, with the single-wire delivery comprising a drying section in the cylinder spaces, for example in the position below the last cylinder.

Within the scope of the invention there is a possible embodiment, wherein the paper machine / board machine comprises a plurality of water cutters, for example with different drying sections, such that each water cutters comprises first independently controlled water cutting nozzle devices and second independently controlled water cutting nozzle devices.

Also within the scope of the invention is a possible embodiment in which the first cutting nozzle devices are located at a different position, for example such that the first cutting nozzle devices are located at the beginning between the first Vac-Roll and drying cylinder Kj and the second cutting nozzle devices Vac-Rollin Sn in web / wire feed. If the second cutting: the cutting nozzle is placed with the dryer section adjacent to the final drying cylinder Kn of the dryer section and the second nozzle initiates cutting from the web edge, this position has the advantage that the pointed tip strip B can be guided immediately from the last drying cylinder to the pulper.

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The dual cutter preferably comprises two cutting nozzles as described above. They are arranged to be synchronized in their movements so that when cutting with other nozzles the so-called. by sharpening the second nozzle simultaneously moving the other nozzles in the transverse direction in the middle of the web and widening the actual headband A. By the method and device solution of the invention, . This sharp tip is highly controllable and can be easily introduced into the pulper after the cylinder. Since there are no notches 5 in the actual threading strap A and so-called. thus avoiding the risk of breakage due to said discontinuities. When using the liquid cutting according to the invention, cutting against the wire is possible. This is a significant advantage because the cutting equipment can be positioned in an optimum position in wire and web feeds. Thus, cutting can occur not only against the wire but also against the wire and the cylinder.

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In the most general embodiment of the method according to the invention, both the first cutter Cj and the second cutter C2 may be either in the same position with each other on the drying section or the respective cutter C1 and C2 may be in different positions. The second cutter C2 performs the formation of a pointed tip strip B, and thus of the actual threading strip A without discontinuities at a position downstream of the web and the wire, for example between the last suction roll and the last drying cylinder. Then, without the separate auxiliary conveying means 20, the sharp-edged edge band B rises above the drying cylinder and moves to the lower pulley after the drying cylinder, and the threading strap A forms a uniform edge at said cut. The threading straps A do not include notches, tails and other harmful discontinuities.

The process according to the invention is characterized in what is stated in the claims.

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

103683

Figures IA-ID show a stepwise twin-water cut formation of a tuft-ribbon.

Figure IE illustrates a prior art method.

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Figure 1F shows a method according to the invention.

Figures 2A-2D illustrate alternative positions of the double cutter according to the invention in both the single wire drying cylinder group and the dual wire drying cylinder group.

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Figure 3 shows a double cutter with cutting nozzles located on different sides of the beam frame with their own guides.

Fig. 4A shows another embodiment of a double cutter, in which each of the cutting nozzles 15 is located on the same guides in their own carriages.

Figure 4B illustrates in principle the solution of Figure 4A.

Figure 4C is an axonometric and illustrative view of the device of Figure 4A.

20th Figure IA-ID illustrates the various cutting steps of the headband. In the most general embodiment of the invention, there is referred to a double cutter 10 which generally comprises cutter Cj and at least one of which cutter C2 brought from outside the web is a liquid cutter and most preferably a water cutter. This second cutter C2 already starts to cut 25 outside the web. The cutter C2 is preferably a shear nozzle through which a fluid jet U2, preferably a water jet, is pressurized to the surface of the web W to be cut. The cutter Cj is also preferably a liquid cutter and most preferably a water cutter. The cutter Cj is then a nozzle through which a fluid jet Uj, preferably a water jet, is applied to the surface of the web W to be cut.

30 6 103683

Fig. 1A shows the first step of forming a headband. The first shear nozzle C j makes the first shear fj. The high pressure liquid jet Uj is applied to the surface of the web W. The threading strap A is blown into the rope passage.

Figure IB shows the formation of a second section f2. According to the invention, the cutting jet of the second cutting nozzle C2 is preferably a liquid jet U2 from the side outside the web W to form a sharp tip 100 on the edge band B. In the embodiment shown in Fig. IB, the track A 'and the edge band B The edge band B has a sharp tip 10,100, and there is no discontinuity in the actual threading belt A, which would pose a risk of breaking it.

In Fig. 1C, the threading strap is introduced into the center of the web by moving both cutting nozzles Cl5C2 to the middle of the web width.

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Figure ID illustrates the step of applying a full web width of the threading strap A.

Figure IE shows a prior art prior art method of cutting Ϊ2 20 from the edge and cutting the edge band B mechanically at point G. There is a notch and tail left on the tape A, which represent a potential risk of breakage.

Fig. 1F illustrates a method solution according to the invention in which the cut f2 is started from the outside of the edge and there is no notch or tail left on the ribbon A, which would pose a risk of breaking. A sharp tip 100 is formed in the ribbon B, which is led to the pulper, and no harmful discontinuities are formed in the threading ribbon A.

Fig. 2A shows alternative positions Bj, B2, B3 of the dual cutters 10aj according to the invention in the dry section of the paper machine / board machine with a single wire feed. The drying section comprises the drying cylinders Kj, K2 ... and the suction cylinders Sj, S2 ·· .. below them. The drying cylinders Kj, ... are preferably steam-heated cylinders and the suction cylinders Sj, S2 ... preferably so-called. Vac-Roll rollers are cylindrical constructions that have grooves on their surface and openings therein through the roll casing inside the cylinder. A vacuum is introduced into the cylinders, whereby the vacuum is used to hold the web on the surface of the wire H. The wire H and the web W run in loops with their knees from the drying cylinder 5 to the suction cylinder and from the suction cylinder to the drying cylinder and forward in the drying cylinder group.

In the embodiment of Figure 2A, a double cutter 10aj comprising two cutting nozzles Cj and C2 is located at alternative positions Bj, B2 and B3. Position Bj is in connection with the last 10 drying groups K3 of the last drying group in the web / wire passage between the drying cylinder K3 and the suction cylinder S3. Position B2 is in a similar position in the middle of the drainage group and position B3 is located at the beginning of the drainage group.

Fig. 2B shows position B4 where the liquid cutting device 10a2 comprising two cutting nozzles Cj and C2 is located at the beginning of the dryer section in the web / wire passage between the first dryer cylinder Kj of the dryer group Rn and the first suction cylinder Sj.

Fig. 2C shows the position B5 of the double cutter 10a3 according to the invention in the double wire drying group between the last dryer cylinder K5 and the lower dryer cylinder K4 20.

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Fig. 2D shows an embodiment of the invention in a drying cylinder group, wherein the first double cutter 10a ^ first cutter C1, preferably the cutting nozzle is located at the beginning of the drying group and the second cutting machine C2, preferably the cutting nozzle The passage of the threading ribbon A and the peripheral ribbon B can be supported by air blowing (ip) in this and previous figures. in the embodiments shown.

Fig. 3 shows a double cutter 10 comprising a cross-member carrier and support beam 11 and guides 12aj, 12a2 on both sides thereof, in which a carriage comprising a cutting nozzle 8 103683 is located. The carriage 13aj is located on the guide 12a ^ and the other carriage 13a2 is located on the guide 12a2- The carriage 13a | and 13a2 is moved by means of a belt device, a chain device or the like 14aj, 14a2 which engage the carriages 13aj and 13a2-The motors are adapted to move said belt or chain devices.

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When, as shown in the figure, the apparatus comprises a side 15 of a beam 15 guided from a second carriage 13a2 and a second cutting nozzle C2 is provided at the end of said arm 11, the cutting nozzles Cj and C2 are provided on the same side of the beam 11. on opposite sides of a support beam 11 extending. This provides sufficient space for the guide structures and the chain curves of the associated carriages 13a1 and 13a2. The figure does not show the actuators associated with the chains, such as the motor. The chain drive may be such that, by means of its output, the motor rotates a drive wheel 15 at the end of the motor output shaft which moves the closed tooth chain. The tooth chain is connected at its end to a swivel wheel located in the bar 11. Each chain thus used is associated with a carriage, whereby the carriage associated cutting nozzle can be controlled as desired.

Fig. 4A shows an embodiment of a double cutter 10, in which each of the cutting nozzles Cj and C2 is located on the same conductor in its own carriages 13a1, 13a2-. The chain devices 14aj and 14a2 are independently coupled to their carriages 13aj and 13a2- The cutting nozzle Cj is located in the carriage 12aj and the cutting nozzle C2 in the carriage 13a2- The pressurized water jet is applied to the surface W of the web through the cutting nozzles Cj, C2. The pressure range is 50 - 300 bar.

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Fig. 4B illustrates one way of controlling by means of the chain device 14aj the conductor 12a ^; a carriage 13aj comprising one of the cutting nozzles; the cutting nozzle Cj. The motor j ^ 20 comprises in its output shaft 21 a drive wheel 22 about which a belt, chain 23 or the like is inserted. The belt, chain 23 or the like is an endless drive loop which is threaded at one end 30 about a rotatable drive wheel 24 connected to the beam 11.

9 103683

Said drive belt 23 or the like is further associated with a carriage 13aj. The carriage 13aj is guided in the guide 12aj.

Figure 4C schematically illustrates the carriages 13aj and 13a2 * of the guides 12a3, respectively. Thus, the chain units 14aj and 14a2 may have their own drive motors 20 and 200.

In the embodiment of Figure 4C, the nozzles and Cj are located on slides 13a1 and 13a2 which are on the same conductor 12a3. However, the cuts fj and f2 10 that they perform may even overlap. This is done so that the nozzles Cj and Cj in their sledges 13aj and 13a2 are bent / inclined towards each other.

In the two-conductor embodiment of Fig. 3, the crossing of the sections fj and f2 has been made possible by the fact that the carriages 13a ^ and 13a2 are located on different conductors 12aj and 12a2-15 *.

Claims (7)

103683 10 A method for forming a threading tape (A) in a paper machine / board machine, wherein the method comprises two cutters (C 1), at least one of which is a liquid cutters 5 (C 2) to produce a pressurized liquid jet (U 2) and that in the process, the first cutter (Cj) makes a first cut (fj) and the second cutter (C2) a second cut (f2) into the paper / board web (W), characterized in that the cutting jet (U2) of said second cutter (C2) (W) in connection with the outside of the web 10 to form an edge band (B) adjacent to the threading strap (A), which edge (B) is sharp at its end (100), whereby the threading strap (A) does not form a notch or tail that weakens the strap (A) . Method according to Claim 1, characterized in that method 15 employs two cutting nozzles (C 1 and C 2), both of which produce a pressurized liquid jet (U 1, U 2) for cutting the paper / board web (W), and (Uj) for making the first cut (fj) in the web (W) and the second cutting nozzles (C2) for the second cut (f2) in the web (W). 20 A method according to the preceding claim, characterized in that the method uses cutting nozzles (C 1, C 2) located in the drying section of the paper machine / board machine and forming a cutting (f) with a first cutting nozzle (C 1) and forming a threading strip (A). and that the second cutting (f2) is then performed on the second cutting nozzle (C2) by starting cutting from the side of the web (W) to form an edge band (B) having a sharp tip (100) and moving the cutting nozzles (C1 and C2) facing the web and widening the threading strap (A) to form the actual wide threading strap (A) in the central area of the machine, and the edge band (B) is easily guided through the 30 sharp tips (100) to the pulpers and , C2) preferably simultaneously by moving them to the middle region forward in both sides of the machine. Method according to claim 2 or 3, characterized in that the double-cutter (10) is arranged in connection with the drying section of the papermaking machine so that both cutting nozzles (¢ ^, C2) are located under the drying cylinder (Kn) and between the last two drying cylinders rainajuok-gas. 5. A method according to any one of the preceding claims, characterized in that a fluid, preferably water, in the pressure range of 50 to 300 bar is used as the cutting medium. A method according to any one of the preceding claims, characterized in that the method uses a double cutter (10,103 ^ 1082,1033,1034) with cutters (CltC2) in the same position. A method according to any one of the preceding claims 1, 2, 3 or 5, characterized in that the method uses a double cutter (10a4) having different cutters (C 1, C 2) at different positions. 12 103683