FI89288B - Method and arrangement in a paper machine or a paper finishing arrangement in order to guide the paper web threading strip - Google Patents

Abstract

Method and arrangement in a paper machine or a paper finishing arrangement in order to guide the paper web threading strip R from the preceding structural assembly 12 to the following structural assembly 14. The paper web W, which is released from the roll or cylinder surface 12' drops down into a pulper 13, broke conveyor. A short scraper blade 23 or corresponding pneumatic scraper is brought into contact with one edge of the paper web W and with the said cylinder or roll surface 12'. A small strip T0-T1 is cut out of the edge of the paper web W, which is spread out by transferring the element 10; 10'; 20, 21, which cuts this synchronously with the blade element 23, which releases the said strip from the cylinder surface 12', or the end of the said strip T1 is spread out correspondingly in the transverse direction to the full width of the threading strip R. <IMAGE>

Description

89288

Method and apparatus for controlling a paper web headband in a paper machine or paper finishing machine For the purpose of adjusting the paper web headband or the paper web or the paper web head or the paper web head.

The invention relates to a method in a paper machine or paper finishing device for guiding a paper web headband from a previous assembly to the next assembly 10, in which a paper web detached from a roll or cylinder surface is dropped into a pulper, scrap conveyor a blade member, such as an air scraper, and in which method a narrow strip is cut from the edge of the paper web, which is applied by moving the cutting member 15 in the transverse direction.

The invention further relates to an apparatus on a paper machine or paper finishing machine for guiding a paper web edge strip from a previous assembly to the next assembly, the apparatus comprising a short scraper blade having a transverse width substantially 20 on the surface of the roll or cylinder of the assembly.

It is known that the head extensions 25 of the drying section or the finishing device of a paper machine comprise pairs of ropes. For example, each drying group is provided with ropes passing through rope pulleys connected to the ends of the drying cylinders. Usually the headband is guided between two ropes, the outer and the inner rope, but three cooperating ropes are also used.

Previously, when starting a paper machine or finishing machine or after a web break, the end of the web was passed through the drying section by cutting a narrow, generally 150-400 mm wide headband from the web, e.g., guided manually using air jets.

2 39288

The constant increase in the running speeds of paper machines and paper finishing machines has brought with it increasing difficulties in the export of web heads. These difficulties are greatest immediately after the press section and in the initial drying section at the group intervals of the drying groups as well as at the coating stations.

5

In previously used headland systems, the headband had to be guided manually at several points, especially in the drying section. With the press section, the strip was pulled by hand to the side and the rope gap and no air hoses were used. This work was dangerous because it had to be done in the immediate vicinity of rotating massive parts. In addition, the work required a lot of habit and professionalism to succeed.

In order to solve the problems presented above, various mechanical and / or air-blown devices are already known, which aim to automate the head export of the paper web. The state of the art related to the invention is referred to in this connection as follows: FI62 695 (cf. US 4 501 643), FI69 144, FI69 145, FI 72 549, FI 78 528, EP 0 226 560, US 3 355 349, US 4 692 215 and FI-hak. Nos. 904841 and 910615 and SE-Publication 459,012 and 466,162.

However, the state of the art as evidenced by the above references has not solved all the problems associated with the control of the head export, and in particular the headband, which are still significant when the paper or finishing device is started. A particular problem is that when a narrow headband is to be guided even at a speed of ~ 1500 m / min, the path of the headband is vague and uncontrollable, e.g. due to different air flows.

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It is a general object of the present invention to further develop the prior art known from the above-mentioned references and to provide a new method and apparatus for improving and verifying the export of edge band between different structural groups of a paper or coating machine.

The object of the present invention is to further develop, in particular, the automatic headband cutting and control device disclosed in the applicant's above-mentioned FI patent 62,695 (corresponding to U.S. Pat. No. 4,501,643). The disadvantage of the above device has been e.g. the fact that when the cutting of the headband in the device 3 89288 is performed by cutting blows, a chip is formed from the headband, which sticks to the export plates, interfering with the passage of the actual edge band. In addition, since in the above-mentioned device, the cutting blow is multiplied in intensity compared to the blows still guiding the headband, the course of the strip 5 during the cutting blows is difficult to control.

In order to achieve the above and later objects, the method of the invention is mainly characterized in that a narrow strip cut from the edge of the paper web is applied by moving said cutting member together with said 10 strips from the cylinder surface or the like.

Typical applications of the invention in paper machines and finishing machines 15 are the assembly section press section-drying section, the drying section-calender reel, the drying section-rope nip before the adhesive press and the passing of the edge strip through the coating station.

The device according to the invention, in turn, is mainly characterized in that the device comprises an actuator and guides for moving said scraper blade transversely over the region of the headband and back to an inoperative position, and that the device comprises a cutting device for removing said scraper blade from the roller or cylinder. the headband can be cut and spread across the width of the headband by moving the cutting device in a transverse direction synchronously with said scraper blade.

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The invention uses an accessory, the essential part of which is a short scraper blade with which the headband or the edge of the web is cut and / or detached from the surface of the roll or cylinder. In addition, the method and apparatus apply a substantially machine direction cutting arrangement in which the edge of the headband or web cut and / or detached as described above is applied to the full width of the headband. The latter cutting devices are preferably integrated in connection with the blade of said scraper to be moved by the same actuators to the operating position and from there back to the rest position.

4,89288

Alternatively, the same water jet or blade members with which the oblique drawing is performed can be used as said cutting devices. In this case, the oblique circular saw or similar water jet device is driven about 20-50 mm from the edge of the paper web. As the scraper blade moves in, it cuts said strip about 20-50 mm wide, after which the five-to-5 circular blade or similar water jet device begins to move at the same point as the edge of the scraper blade.

In the following, the invention will be described in detail with reference to some application examples of the invention shown in the figures of the accompanying drawing, to the details of which the invention is in no way narrowly limited.

Figures A, B, C and D show, as a prior art, background and application environment of the invention, mainly the previously known cutting and guiding of the headband with its various steps.

15

Figures 1A, 1B, 1C and 1D show different steps of the method according to the invention.

Figure 2 shows an apparatus applying the method of the invention fitted in connection with a drying cylinder of a paper machine or finishing machine to guide the headband following a rope spool.

Figure 3 is a side view of the same as Figure 2 on a larger scale.

Fig. 4 shows another embodiment of the device according to the invention in a manner similar to Fig. 3.

Fig. 5 shows the device according to Figs. 2 and 3 mainly as seen from the direction B marked in Fig. 2.

The prior art, the problem field and the application environment related to the invention will first be described with reference to Figures A, B, C and D of the accompanying drawing, in which the export of a headband between two successive structural groups is shown in stages. In Figures AD, the first group is represented by a cylinder 12 and the second group by a cylinder 14. According to Figure A, e.g. when starting a paper machine, the paper path is led to a cylinder 12, from which it is removed with a scraper 11 and guided to a pulper 13 below. The 400 mm wide headband R with a machine direction incision C and the headband Rq thus cut according to Fig. A and the main part W0 of the web W are dammed in the pulper 13. The headband R is cut with a cutting blade 10, such as a water jet or circular blade 10 '. against the surface 10, but in the free space of the web. After the step shown in Fig. A, the headband R0 is guided by blowing devices (not shown) or the like to the latter structural unit, which according to Fig. B is a cylinder 14. In this case, the untensioned edge band Rj 'is tightened e.g. by increasing the speed of the latter cylinder 14. Then, according to Fig. C, oblique drawing is performed by moving the cutting member 10 in the transverse direction 15 T, whereby the head thread strip R2 spreads steplessly to the full-width track Wj according to Fig. D due to the incision Cj.

Figures 1A, 1B, 1C and 1D show the different steps of the method according to the invention and the different functions of the device according to the invention. Fig. 1A corresponds to Fig. A, according to which 20 the cylinder 12 is cut from the web W by an incision C with a cutting device R by a cutting device 10 or 10 'and the dependent parts of the web W and the headband R removed from the cylinder 12 go to the pulper 13 according to Fig. A. In this case, the blade 23 and the cutting member 20 of the short scraper according to the present invention are in the side positions 23A and 20A. Thereafter, the threading device according to the invention is switched on and the doctor blade 25 will begin to move 23A of Figure IA in position 23A in the direction of arrow A of Figure IB, according to the position 23B. When the scraper blade 23 has reached the position 23B according to Fig. 1B, i.e. the outer edge of the edge strip R, the cutting member in the position 20B is switched on. Then, according to Fig. 1C, the cutting member 20C cuts a narrow strip T0 from the outer edge of the headband R, which, together with the cutting member 20C, is disengaged from the surface 12 'of the cylinder 12 by a scraper blade 23C moving synchronously to the center 30 of the paper machine. At this point, the part of the headband R outside the strip T0 and the web go to the pulper 13 according to Fig. 1A. that, according to Fig. 1, the strip T0-T] applied as a full-width headband Rj is transferred to the rope belt G formed before the rope pulley 15 between the guide ropes 16a and 16b. When the end of the step according to Fig. ID has been completed, the oblique drawing according to Fig. C is performed and the path W is applied to full width, at which point the cutting member 20 according to the present invention is no longer used, but the water jet cutter 10 or the circular saw 10 '. The invention can also be implemented in such a way that, at the same time as the movement of the blade 23, an oblique circular saw blade 10 is moved to the edge of the paper web W at a distance of about 20-50 mm from said edge. As the blade 23 moves inwards, it then cuts said 20-50 mm wide strip, after which the oblique circular saw blade begins to move at the same point as the edge of the scraper blade 23. The invention can also be implemented in such a way that the same cutting member, such as a water jet 10 or a sloping circular saw 10 ', also performs the cutting and spreading of the edge strip Tq-Tj of the headband-15.

A first embodiment of the device according to the invention will now be described with reference to Figures 2 and 3. The device shown in Figures 2 and 3 implements the method described above.

20

As shown in Fig. 2, after the cylinder 12, a paper guide roll 14 follows, over which a lead rope 16a passes to a pulley 15, which also receives a second lead rope 16b. The ropes 16a and 16b form a rope crystal G, to which the end strip Tt of the track W is guided according to the method steps described above. In addition, Fig. 2 shows a straight blow plate 17, along the surface of which air blows Fj are applied, which ensure that the strip Tj is guided in the fringe G.

According to Figures 2 and 3, the head-pulling device according to the invention comprises a body part 25 to which a scraper body 22 is attached by a horizontal joint 25a. A pair of load hoses 26a and 26b are arranged between the body parts 25 and 22. At a pair of hoses 26a, 26b with controllable adjustable pressures pa and pb, a scraper blade 23 attached to the body 22 is loaded 7 39288 against the smooth surface 12 'of the cylinder 12. Attached to the scraper body 22 is a curved guide plate 24 which guides the end Tt of the headband R to the palate G, where a lateral displacement is also required, as will be better seen in Figure 5, which will be described in more detail later. The head-feeding device comprises a cutting device 20, which comprises e.g. a nozzle 5 20a, through which a pressurized water jet 21 is applied, with which the head-feeding strip T1 is cut as described above. The scraper body 25 and the body of the cutting device 20 are preferably integrated into a single unit which is moved as shown in Figures 1A-1D above the width of the headband R by actuators, which will be described in more detail later in connection with Figure 5.

10

Figure 4 shows another embodiment of a head threading situation according to the invention. The device according to Fig. 4 further comprises a scraper blade 23 of width or slightly wider than the headband R as described, which is pushed under the edge strip R as shown in Figs. 1C and 1D. In this case, a transverse blowing of the machine (not shown) can be used as an aid, which raises the edge band R to the side when the blade 23 is pushed in its transverse operating position. The device according to Figure 4 does not include a water jet cutting device 20,21 at all, but a mechanical cutting system, which is described below. In the initial stage, the headband Tape Rq enters the pulper and the guide plate 24 is raised to the upper position 24 "by its mounting arm 28 articulated to the scraper body 25 of the horizontal joint 28a. The device includes a cutting abutment 27 with a cutting edge 27a at the lower end. The cutter 24a at the outer end 28 is moved along the arc K to the cutting position 24a ', whereby the headband R intersects between the members 24a and 27a and the strip portion Rq under the guide plate 24 falls into the pulper 13 or the like, after which the end of the headband Rj is guided.

Fig. 5 shows the device according to Fig. 2 mainly seen from the direction B marked therein. Fig. 5 is very schematic and mainly illustrates devices for moving the scraper 23,25 and the cutting device 20 from the side position 30 of Fig. 1A to the position of Fig. 1 and back. For this transfer, the head-export device is provided with a body part 30, to which the scraper body 25 and the cutting device 20 and the 8% 92 88 guide plate 24 are attached. The body part 30 has guides 34 moving in transverse guides 37. Said guides 37 are fixed to a beam 33, which in turn is fixed to a paper machine frame beam 36. The carriage-like body part 30 is connected to the piston rod 32 of the operating cylinder 31 for movement in the paper machine cross-section. arrow P direction. The actuator cylinder 31 is articulated at one end to the frame beam 32. In Fig. S, the cutting device 20 and the guide plate 24 are marked with broken lines laterally moved to the position 20A, 24A of Fig. 1A on the actuator cylinder 31.

The device according to Figures 2, 3 and S further comprises arrangements 10 known per se for controlling the operation of the water jet 21 of the cutting device 20 and arrangements for controlling an adjustable pressure in the pressure hoses 26a and 26b for loading the scraper blade 23. In addition, the device includes various control devices with which the different phases of the operation of the head input device can be controlled and arranged to operate sequentially automatically in suitably driven sequences under the influence of different control pulses. These control devices are not actually within the scope of the present invention, so they will not be described in more detail in this connection.

Many variations on the above details are possible within the scope of the invention. For example, the mechanical plate-like scraper blade 23 can be replaced by a correspondingly known air scraper 20, which is implemented e.g. by applying a narrow and strong jet of air at the scraper blade 23 from the narrow nozzle opening of the scraper blade 23.

The following claims set forth within the scope of the inventive idea defined by the invention, the various details of the invention may vary and differ only from those set forth above by way of example only.

Claims (12)

A method in a paper machine or a paper finishing device for guiding the tip pull band (R) of the paper web from the previous construction group 5 (12) to the following construction group (14), wherein the paper web (W) detached from the roller or cylinder surface (12) ') falls into a pulper (13), projection conveyor or equivalent, in which a short blade blade (23) or corresponding blade member, such as an air blade, is transmitted in communication with one edge of the paper web (W) and with said cylinder or roller surface (12 ') and at which method a narrow strip (T0-Tj) is cut from the edge of the paper web, which is spread by transferring a member (10; 10'; 20,21) which cuts it in the transverse direction, characterized in that the narrow strip (T0-T,) printed from the edge of the paper web (W) is spread by transferring the means (10; 10 '; 20,21) which cuts this synchronously with the leaf organs t (23) which loosens said strip from the cylinder surface (12 ') or the corresponding transverse direction to said strip (Tj) is widened to the full width of the tip pull band (R). A method according to claim 1, characterized in that a tip drawing strip (R) is cut from one edge of the paper web (W) with a water jet 20 (10) or a cutting blade (10 ') which together with the web (W) is loosened with a full wide blade or equivalent and dropped into a pulper (13) or the equivalent, cutting a narrow strip (Tq-Tj) from the outer edge of the tip pull band (R) which is released from the roller or cylinder surface ( 12 ') and is transmitted by mechanical control means (23) and or by an air blow (Fj) to the following lingap (G) or the corresponding, and that said tip drawing strip (T0-Tj) is extended to the width of the tip drawing band (R), after which said the blade means (23) and the cutting means (20, 21) are transmitted in a non-functional lateral position and the paper web (W) is extended with an oblique pull to its full width (Figures C and D). 30 Method according to claim 1, characterized in that the strip (T0-Tj) cut from the edge of the paper web (W) is cut with the same cutting means 14 89288 (10; 10 '), by which the oblique drawing and propagation of the the tip pulling band (R) to its full web width. Method according to any one of claims 1-3, characterized in that the blade means in the process consists of a blade (23), substantially the same width as the tip-pull band or slightly wider, which is transmitted under one edge of the paper web (W). the tip drawing band (R) cut from the web (W) is most preferably cut by mechanical cutting means (24a, 27a) and the end of the foamed tip drawing band is controlled by a mechanical control device (24) constituting an extension of said mechanical cutting devices to the following lingap ( G) or equivalent (Figure 4). Apparatus in a paper machine or a paper finishing machine for guiding the tip drawing band (R) of the paper web (W) from the preceding construction group (12) to the following construction group (14), the device comprising a short scraper blade (23), the width in the transverse direction has substantially the same width as the tip pull band (R) or slightly wider, which blade member (23) is arranged to release the foam tip tip band (R) or one edge of the web (W) from the surface (12 ') of the roller or cylinder. of the preceding design group, characterized in that the device comprises a functional device (31,32) and conduits (33,34), with which said blade (23) can be transmitted in a transverse direction over the area of the tip pulling band (R) and back to the -functional position, and that the device includes a cutting device (10; 10 '; 20,21) with which the tip-pull strip (T0-Tj) is released from the surface (12') a The roller or cylinder (12) of said blade blade (23) can be cut and expanded to the width of the tip pull band (R) in the transverse direction of said cutting device (20,21) by transferring said cutting device (10; 10 '; 20,21) synchronously in the transverse direction together with said blade (23). 6. Apparatus according to claim 5, characterized in that in said cutting device there is a cutting member (20, 21) fixed in connection with the body part (22) of said 89898 blades (23), most preferably a water spraying device, which together with said blades (23) can be moved transversely with said functional device (31,32). 7. Apparatus according to claim 5, characterized in that said cutting means consists of the same cutting means, such as a water spray cutting device (10) or a mechanical cutting blade (10 '), which performs the skewing and propagation of the web into a full width web. (Figures C and D). Apparatus according to any one of claims 5-7, characterized in that in the direction of travel of the tip pull band (R) after said blade blade (23) there is in the device a mechanical curved guide disc (24) which controls the strip (Tj) cut from the tip pull band. or the edge of the web (W) also in the lateral direction and guides it to the following lingap (G) or equivalent. Device according to any of claims 5-8, characterized in that the device comprises a body part (25) and a sheave body (22) which is hinged therein, to which the body of said shaver blade is fixed and that between said body part (22, 25) provided functional devices, most preferably hoses (26a, 26b), which can be loaded with pressure medium, with which the blade (23) can be loaded against the roller or cylinder surface (12 ') - Device according to any of claims 5-9, characterized in that a mechanical cutting device (24a, 27a) is arranged in connection with the device, with which the tip-pull belt (R) can be broken off and further controlled by a mechanical control disk (24). or equivalent. Device according to claim 10, characterized in that the device comprises a latch (27), the outer end of which has a cutting edge (27a), the device comprising a guide plate (24) which is fixed by means of a shaft ( 28) or correspondingly to the body portion (25) of the device, and that at the inner end of said guide plate (24) there is a cutting member (24a) and said cutting edge (27a) and the cutting member (24a) are arranged to cutting the hanging end (Rq) of the tip pull band (R) and guiding the thus defoaming end further to a lingap (G) or equivalent by means of said guide disc (24). 5 Apparatus according to any one of claims 5-11, characterized in that the device comprises an outer beam (35) or equivalent which is fixed to the body part (36) of the paper machine or the finishing machine, in connection with which beam is fixed linear lines (33). that a sledge body part (30) is supported against said linear lines (33) which are moved transversely of the paper machine or corresponding with a functional device, most preferably a hydraulic cylinder (31,32), and that said blade (23) with body parts (22) and loading devices (26a, 26b) are arranged in communication with said body part (30) and a curved guide plate (24) which guides the end of the tip pulling band (R) and most preferably also a cutting device (20,21) for the tip drawing strip (Tq-Tj). (Figure 5).