EP0826615B1 - Method and device for winding a paper web into a roll - Google Patents

Abstract

The strip winding process involves winding the strip (2) onto a drum (1) mainly or entirely by a torque applied centrally. A pressing air expulsion element (7.1, 7.3) continually presses on the surface of the paper roll (3) thus formed to press out the air. The weight of the roll being formed and of the drum is compensated by a force applied to the surface of the roll across the width of the strip during at least part of the winding process. This compensation force acts on the flat, providing most if not all of the compensation for the weight.

Description

(1)   DE 40 07 329

(2)   DE 32 44 510

(3)   FR 15 13 694

(4)   GB 12 97 812

(5)   US 19 23 670

(6)   EP 0 483 092 A1

The invention relates to a method and a device for winding a running paper web into a roll. The following publications are relevant:

(1) DE 40 07 329

(2) DE 32 44 510

(3) FR 15 13 694

(4) GB 12 97 812

(5) US 19 23 670

(6) EP 0 483 092 A1

Winders for winding paper webs are either at the end arranged in a paper machine in order to produce the paper web Bring roll shape. But they are also used to make a finished Roll roll to roll a specific winding quality to manufacture.

In any case, the wrap should have very specific properties, especially as far as the winding hardness is concerned. The winding hardness should mostly be from fall from a certain initial value to a final value, whereby on In the beginning a hard core winding is particularly important. The waste is said to be from the be as even as possible from the first to the last layer. He should be one have certain gradients, i.e. not too strong and not too weak his. The course of the winding hardness should in no case jump points have, e.g. a sudden drop. No in the wrap Radial or destructive or destructive paper web Tangential stresses occur.

So far, all of this has been attempted, but has not been achieved. Winding machines instead of known design, e.g. Wraps where the core is either extremely soft or extremely hard, and where towards the end - around four fifths of the winding diameter - a sharp drop in Winding hardness occurs. As a result, the first part, that is, the extreme soft or hard core, is unusable because namely the path in this Area is compressed and bursts, so that this part as a committee must be thrown away; in the end area where the wrap is not enough is wound hard, there is a lateral displacement of the layers relatively to each other so that the end faces of the finished roll appear frayed and the web edges can be easily damaged.

A badly built core (too little or too hard) allows namely no perfect structure of the rest of the winding. The problem is particularly serious for pressure-sensitive papers, e.g. self-copying (SD) papers, the pressing of the Drums with the resulting roll against it The lateral surface of the support drum is subject to narrow limits.

The invention has for its object a method and a To design the device for winding a running paper web in such a way that the winding hardness from the beginning to the end of the roll the desired Has course, i.e. that the winding hardness in every moment of the Winding process is under control. In addition, of course machine effort can be kept as low as possible.

This object is solved by the features of the independent claims.

The inventors first recognized that the poor quality of the windings produced on known winding machines is due to a number of interfering influences. These are in detail:
Swiveling the reel during the winding around the circumference of a carrier drum, abruptly placing the wound reel on the guideway,
Shocks and thus irregularities caused by the transfer of the reel from the pair of primary levers to the pair of secondary levers,
Irregularities when changing the drives. A crucial finding is that combining different types of drives is disadvantageous, namely combining a central drive and a peripheral drive of the resulting role. Accordingly, the inventors have consistently focused on the central drive, which is the most important means of controlling the build-up of the winding hardness. This has the advantage that the centrally applied torque creates a "wrapped" web tension that is completely steady and that can be kept constant or changed continuously during the entire winding process. There are therefore no jumps in the web tension, so that the winding hardness is kept under control during the entire winding process by being adjustable to any value. In addition, the following is made possible by the invention: A new reel can be inserted into a position shortly after the reel change (e.g. on a horizontal guideway) which later enables a controlled reel change. In spite of this, he initially has no contact with the railway, so he does not have to be driven at first. Overall, this makes it possible that (if necessary, e.g. in the case of an exceptionally faulty start of winding) a reel change can take place at any time, e.g. B. even as long as the paper roll is not yet full.

When paper rolls with a particularly large diameter are formed should, then it is advantageous to the resulting roll of paper during the Winding process by a weight compensation device support that is flat, so that it on the lateral surface of the Role affects over a certain part of the scope and thus not only along a line. This will bring up a noteworthy Line force avoided at all and thus also a discontinuity that bring such line forces with it.

According to the invention it is provided that the paper web exclusively by means of a centrally introduced torque, for example is wound onto a reel by means of a central drive and on the emerging role is constantly at least one across the web width extending pressure or squeezing element for squeezing air acts.

At the beginning of The winding process is the reel and a threading roller in one The winding position is brought close and parallel to each other and the web is brought up to the feed roller so that it over a certain Circumferential angle wraps through the gap between the drum and Guide roller is guided around and wound onto the reel, with a first of the printing elements extending over the web width onto the resulting role acts. After the roll in the winding position was wound, it is according to this embodiment of the The inventive method in a main winding position for further Winding, brought for example by a horizontal movement. In the Main winding position, the roll is then completely wound, at least another pressure element on the outer surface of the resulting roll acts.

In the The main winding position is the first printing element that is already in the The winding position acts on the roll, brought out of contact with the roll , taking care that at least one other Pressure element acts on the outer surface of the roller, so that the condition according to the invention that during the entire winding process at least one pressure element extending over the web width for Squeezing air acting on it is fulfilled.

In a further development of the method, the weight of the emerging role and the drum at least during part of the Winding process by an attacking on the surface of the roll over force acting on the web width, the so-called compensation force compensate.

The compensation force is preferably an area-acting force which Dead weight of the reel and drum compensated.

In a particularly preferred embodiment of the invention The method is the compensation device for applying the Compensation force, which in this embodiment is only in the Main winding position affects the role, according to the role growth move it vertically, for example vertically downwards.

Generally, three possible preferred ones are according to the inventive method Variants conceivable. In a first variant, the emerging role leads Movement that has a horizontal component, the Central drive takes part in this horizontal movement and thereby by one Sledge is guided.

In an alternative embodiment of the invention, that the emerging role in the main winding position together with the Central drive can be kept stationary and in contact with the roller located pressure elements with increasing roll diameter one Carry out a movement that has a horizontal component. So at such an embodiment, a first pressure element with growing Roll diameter moved away from the emerging roll and in one Final stage brought out of contact, where, however, another Printing device with increasing roll diameter in contact with the Roll arrives and remains on it until the winding process is complete.

The mechanical effort is due to the subsequent design of the Process kept particularly low. This is according to the invention provided to design the compensation device such that the Compensation device comprises a pressing element, both for at least provides a compensation force for part of the winding process serves as a further pressure element. So it is with one Embodiment possible, the further pressure element according to the invention to represent by a pressing element that also the compensation force to Supports the winding roll.

So that the compensation device in the horizontal direction moving drum always has sufficient support is in a special embodiment provided that the Compensation device together with the drum and the emerging role performs a horizontal movement.

It is particularly preferred if the drum with the resulting roll after threading the web, one leading away from the threading roller Horizontal movement and after the horizontal movement has started first pressure or squeeze element pivoted into its working position becomes.

In addition to the method, the invention also provides a device for Winding a paper web into a roll with a reel on which the Web is available. The device according to the invention is characterized in that a central drive of only the torque required to wind up the reel applies, is provided. Furthermore, the device comprises at least one permanently effective Squeeze or pressure element that extends across the web width. At least one squeezing element is in the area of the run-up Web arranged on the emerging roll and serves to squeeze Air.

In the case of the invention The winding device is the resulting roll after winding around a certain distance, which has a horizontal component, moves and into a Position in which the main winding process is carried out. To the Moving the central drive to the main winding position become a sled as well a guideway for guiding the carriage during horizontal movement intended.

In a development of the invention it can be provided that the Device has a compensation device that the weight of the emerging role and the drum mainly or alone compensated and which attacks on the outer surface of the roller.

In a development of the device according to the invention can be provided be that it has a feed roller, which in a parallel to the drum and can be brought to this close position.

In a development of the device according to the invention, the Compensation device by appropriate means depending on Roll growth in a vertical direction, for example vertically downwards method.

If the drum and the resulting roll move in a horizontal direction, it is advantageous if the compensation device follows them, is also moved in the horizontal direction.

A particularly inexpensive embodiment of the invention provides that the compensation device comprises a pressing device which both Compensation device acts and thus relieves the growing role as well as a further pressure or squeeze element that squeezes of air.

In a special embodiment it is provided that the Compensation device has a circumferential support band, the for example, the two support rollers of the compensation device wraps around. It is particularly advantageous if the compensation device has an anti-skid device which is inside the loop of the support band is arranged and over which the support band slides.

The invention is explained in more detail by way of example with reference to the drawing.

This shows a drum 1 on which a paper web 2 is wound to form a roll 3.

A drivable compensation device 4 is also provided, which is a revolving belt 4.1 and three guide rollers 4.2, 4.3 and 4.4 comprises. The The belt and the guide rollers extend across the width of the resulting Roll 3.

One can also see a drivable feed roller 5. This is by means of a Swivel arm 5.1 can be swiveled up to the drum 1 until it comes into contact and swiveling away from it again. Drum 1 can be rotated in slide 9 stored; these can be moved along a guideway 6. The Guideway serves u. a. also carrying another sled for a central drive shown only schematically at 11, which in the center of the Tambours 1 torque for the purpose of winding the paper web 2 initiates.

One can also see a swivel lever 7 with a squeezing element 7.1. here a roll that is either freely rotatable or provided with a drive.

The device works as follows:

A guide roller can be seen in the illustration on the left in FIG. 1 8. This can optionally be assigned a counter roller 8.1, which can be pressed against the guide roller 8 by means of a lever and pneumatics is. In this case, the rollers 8 and 8.1 represent a tensile press which is also drivable.

Figure 1 illustrates the starting or winding position and the Transfer process. The drum 1 is inserted into the carriage 9 and on Machine speed accelerates. The transfer roller 5 is pressed against the drum 1. The paper web 2 is one Guide roller 8 brought up to the feed roller 5 from below, loops this and is then through the press nip between drum 1 and Run roller 5 and passed through blow nozzles, not shown here wrapped around the drum 1 so that the winding takes place can go.

Then the drum with the wound start of the track 2 in Move the example shown here to the right into the horizontal position of the compensation device 4. This is where the actual winding process "main winding process" - see Figures 2 and 3. The winding process is shown solely by the Central drive 11 worried. It can be seen from Figure 3 that the Compensation device 4 a vertical movement during the Has carried out the main winding process. At first she was in the Position shown in dashed lines, while the solid lines the Position of the compensation device 4 towards the end of Show winding process.

During the main winding process, pivot lever 7 has Air squeeze roller 7.1 pivots back down to the left executed. Instead of the squeeze roller 7.1 there is another squeeze roller 7.3 to the paper roll 3 by means of a much shorter pivot lever 7.4 been swung up.

The pivoting movement of the roller 7.1 has been made possible by the space, the result of the horizontal movement of drum 1 with the resulting roll 3 arose. The feed roller 5 and the associated pivot lever 5.1 can also be pivoted down during the winding process become. This means that a new drum 1.1 can be inserted at any time another pair of slides 9.1 are inserted. The drum remains temporarily without contact with paper web 2; during this time he must are not yet driven.

One of the two slides 9 and 9.1 runs outside, while the other runs inside runs on the guideway 6. This is necessary for the two sledges can walk past each other. See for example DE 44 01 804.

Figure 4 illustrates the situation shortly before the reel change. The new drum 1.1 is now powered; the feed roller 5 and the Squeeze roller 7.1 is swung up on the new drum 1.1. Now can a separating device (arrow T) cut the web transversely, so that the new web start is wound on the new drum 1.1. The full Paper roll 3 is braked and then removed from the device. The next winding process then takes place, as described above with reference to FIGS. 2-4 described.

A device comes in as a flat support device, for example Consider as described in DE 44 18 900 A1 - see FIG. 2 there.

FIGS. 5 and 6 illustrate a further embodiment of the Invention. The winding machine shown has essentially the same Components based on how the machine according to the previous figures.

5 shows the normal path of web 2 - there in solid lines are shown. This is the condition similar to Figure 3. The new drum 1.1 is already in the slide 9.1, but still at a standstill, without contact with the train 2.

However, the course can also be seen from FIG. 5, shown in broken lines the web 2a shortly before a role change. Is running at this time Drum 1.1 around.

6 illustrates two further phases of the winding work. With solid lines are the paper web 2b after the roll change shown. The finished roll 3 (Fig. 5) has already been removed. The new one, yes wound drum 1.1 is with its slide 9.1 in the (right) Winding position shifted. Both squeeze rollers 7.1 and 7.3 are on new drum. The dash 2c is in the END FIELD with dashed lines Normal state "shown, analogous to Figure 3. Here, the rollers 5 and 7.1 pivoted down.

FIGS. 7 to 11 illustrate a further embodiment of a winding machine according to the invention.

In this machine, in turn, a pivot lever 7 is provided in turn carries a pressure roller 7.1, but at the same time also one Drum 1. A threading roller 5 'is fixed in place. A second Pressure roller 7.3 can be moved horizontally on a guideway. The Relief device 4 is analogous to the relief device 4 in FIGS Figures 1 to 4 designed. Here, too, is at the inlet to the winding machine at least one guide roller 8, possibly also one Pressure roller 8.1, which forms a pull press with roller 8.

FIG. 7 shows the machine in the phase of winding the paper web 2 the drum 1.

Figure 8 shows the winding machine during the main winding process. Swivel lever 7 with drum 1 and pressure roller 7.1 is now such lowered that support is provided by the relief device 4. The main part of the winding work is carried out in this position of the individual parts.

Fig. 9 shows the situation shortly before the end of the main winding process. Here the pressure rollers are also changed. The upper pressure roller 7.1 is namely moved on the swivel lever 7 from the paper roll 3, while the lower pressure roller 7.3 acts on the circumference of the paper roll 3.

10 shows the situation when the winding process has been carried out completely. The Paper roll 3 is now ready. Swivel lever 7 with pressure roller 7.1 is swung up. The new drum 1.1 is inserted in the swivel lever 7, but is still standing (no contact with the train).

11 is pivot lever 7 so far from Paper roll 3 swung away so that drum 1.1 on the feed roller 5 ' is present. A separator that is only symbolized by an arrow, cuts the web 2, after which a new winding process begins.

Figure 12 illustrates an embodiment of a winding machine that is similar that according to Figures 7 to 11. In contrast to the execution according to 7 to 11, however, the two are changed here Pressure rollers 7.1 and 7.3 even with a very small diameter of the roller 3. This makes it possible to insert a new reel 1.1 very early.

Figures 13 and 14 show an embodiment that clearly Differences from the previous embodiments.

In both figures, the path of the paper web is both extended and also shown in dashed lines. 13 illustrates the extended Representation of web 2 the normal web run to that on drum 1 emerging paper roll 3. The next drum 1.1 is still standing. The dash-dotted web run 2a, however, is the web run shortly before Role change. The next drum 1.1 runs here.

14, the web run 2b is the web run that shortly after the roll change occurs, while web run 2c in turn illustrates normal course, as shown in Fig. 13 in solid lines. Thereby the next but one drum 1.2 can be inserted.

An important difference of the machine according to FIGS. 13 and 14 compared to the previous embodiments is that a device 10 is provided, which in the manner of a shoe press with a Shoe (20) is known for. B. from DE 3 503 240 (PA 04174). The Device 10 takes over the function of relieving the weight of the roller 3 and at the same time the function of the pressure roller 7.3.

14 shows a modified embodiment of the machine according to FIG Fig. 13 shown. In this embodiment, a circumferential encloses Volume 4.1 the compensation device.

Claims (18)

1. Method of winding up a paper web (2) into a reel (3), characterized by the following features:

   1.1 at the beginning of the winding operation, a drum (1, 1.1, 1.2), into which a torque is introduced only centrally, and a moveable lead roll (5) are brought into a winding start position close and parallel to each other and are pressed against each other;

   1.2 the paper web (2) is led up to the lead roll (5) so that it wraps around the latter over a certain circumferential angle, is led through the nip between drum (1, 1.1, 1.2) and lead roll (5) and wound up on the drum (1, 1.1, 1.2) to form a reel (3), at least one pressure element (7.1; 7.3) extending across the web width acting on the circumferential surface of the reel (3) produced continuously, that is to say during the entire winding operation, in order to squeeze out air;

   1.3 the reel (3) started in the winding start position is moved through a certain distance, which includes a horizontal component, into a main winding position for further winding, the nip being opened;

   1.4 in the main winding position, the reel (3) is wound to a finish and brought into contact with at least one further pressure element (7.3) extending over the web width.
2. Method according to Claim 1, characterized in that in the main winding position, the first pressure element (7.1) is moved out of contact with the reel (3) once at least one further pressure element (7.3) is acting on the circumferential surface of the reel (3).
3. Method according to Claim 1 or 2, characterized in that the weight of the reel (3) produced and of the drum (1, 1.1, 1.2), at least during part of the winding operation, is compensated for by a force which acts on the circumferential surface of the reel (3) and acts over the web width.
4. Method according to Claim 3, characterized in that the compensation force is a force which acts over an area and which, on its own or predominantly, compensates for the inherent weight of the reel (3) produced and of the drum (1, 1.1, 1.2).
5. Method according to either of Claims 3 and 4, characterized in that a compensation device (4) for applying the compensation force acts on the reel (3) in the main winding position and is moved vertically in accordance with the growth of the reel in the main winding position.
6. Method according to one of the preceding claims, characterized by the following features:

   6.1 the reel (3) produced executes a movement which has a horizontal component;

   6.2 the central drive (11) also carries out the horizontal movement and, in the process, is guided by a carriage.
7. Method according to one of Claims 1 to 5, characterized in that the reel (3) produced in the main winding position, and also the central drive (11), are fixed in position and, as the reel diameter increases, the pressure elements (7.1, 7.3) in contact with the reel (3) execute a movement which has a horizontal component.
8. Method according to Claim 5, characterized in that the compensation device (4) comprises a pressing device (10) which both provides a compensation force, at least for part of the winding operation, and also serves as a further pressure element (7.3).
9. Method according to Claim 5, characterized in that the compensation device (4), together with the drum (1, 1.1, 1.2) and the reel (3) produced, executes a horizontal movement.
10. Method according to one of the preceding claims, characterized by the following features:

    10.1 the drum (1, 1.1, 1.2), together with the reel (3) produced, carries out a horizontal movement leading away from the lead roll (5) after the web (2) has been led up;

    10.2 after the start of the horizontal movement, the squeezing element (7.1) is pivoted into the operating position.
11. Apparatus for winding up a paper web (2) into a reel (3), characterized by the following features:

    11.1 having a drum (1, 1.1, 1.2), onto which the web (2) is wound, and having a moveable lead roll (5);

    11.2 the lead roll (5) can be brought into a position parallel to the drum (1, 1.1, 1.2) and close to the latter and is pressed against the drum (1, 1.1, 1.2);

    11.3 having a central drive (11), which exclusively applies the torque needed for the winding operation to the drum (1, 1.1, 1.2);

    11.4 having at least one pressure element (7.1, 7.3), which extends over the web width, at least one pressure element (7.1, 7.3) being arranged in the area in which the paper web (2) runs onto the reel (3) produced and continuously, that is to say during the entire winding operation, serves to squeeze out air;

    11.5 the reel (3) produced and the central drive (11) can be moved by a certain distance, which has a horizontal component, into a main winding position after the start of winding;

    11.6 in the main winding position, the reel (3) is wound to a finish and is brought into contact with at least one further pressure element (7.3);

    11.7 provision is made for a carriage (9) for moving the reel (3) produced and the central drive (11), and also a guide track (6) for guiding the carriage (9) during the horizontal movement;

    11.8 in the main winding position, the reel (3) is brought into contact with at least one further pressure element (7.3) which extends over the web width.
12. Apparatus according to Claim 11, characterized in that the apparatus has a compensation device (4), which, predominantly or on its own, compensates for the weight of the reel (3) produced and of the drum (1, 1.1, 1.2) and which acts on the circumferential surface of the reel (3).
13. Apparatus according to Claim 12, characterized in that the compensation device (4) is a device which acts over an area on the circumferential surface of the reel (3) produced.
14. Apparatus according to Claim 12 or 13, characterized in that the compensation device (4) can be moved in the vertical direction in accordance with the growth of the reel.
15. Apparatus according to Claim 14, characterized in that the compensation device (4), together with the drum (1, 1.1, 1.2) and the reel (3) produced, can likewise be moved in the horizontal direction.
16. Apparatus according to one of Claims 12 to 15, characterized in that the compensation device (4) comprises a pressing device (10) which relieves the load on the reel (3) and serves as a pressure element (7.3) for squeezing out air.
17. Apparatus according to one of Claims 12 to 15, characterized in that the compensation device (4) has a circulating supporting belt (4.1).
18. Apparatus according to Claim 17, characterized in that the compensation device (4) has a sliding shoe, which is arranged within the loop of the supporting belt (4.1) and over which the supporting belt (4.1) slides.

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