EP0792829B1 - Method of winding a paper web into a roll - Google Patents

Abstract

The system is for winding up a strip of paper on a roll (9). When a roll is full, another roll spindle is spun up to speed on an arrangement (7) with a belt (7.3) stretched over two rollers (7.1,7.2). The roll core is then dropped or positively moved down onto the paper web just before it joins the nearly full roll. The paper web is then cut before it joins the full roll, but after the empty roll core. An air blast nozzle blows the paper strip towards the empty roll core, which then catches the loose end of the paper strip and proceeds to roll it up. The support for the full roll is then dropped away and the roll is then removed and the new roll then moves onto the support.

Description

(1) DE 40 07 329 A

(2) DE 32 44 510 A

(3) FR 15 13 694 A

(4) GB 12 97 812 A

(5) US 19 23 670 A

(6) EP 0 483 092 A

(7) US 3 857 524 A

(8) DE 44 15 324 A

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

(1) DE 40 07 329 A

(2) DE 32 44 510 A.

(3) FR 15 13 694 A

(4) GB 12 97 812 A.

(5) US 19 23 670 A.

(6) EP 0 483 092 A

(7) US 3,857,524 A

(8) DE 44 15 324 A

Winding machines for winding paper webs can end at one Paper machine arranged to roll the resulting paper web bring (so-called Pope-Roller). But they are also used to to roll a finished roll, to roll a specific one To produce winding quality.

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 be. 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.

In the process according to document (1), the resulting roll of paper, such as mentioned in the horizontal direction according to the roll growth postponed. The paper roll reaches an enormous weight, the hundred Can exceed tons. Because of this, the paper roll on your Growing not so delicately pressed against the pressure drum fluctuations in line force are avoided.

Document (8) shows and describes a winding machine for winding a Paper web on a central drive reel. This machine includes a winding station, a take-up station and a drive-less pressure roller. The pressure roller is continuously on the circumference of the secondary roll in the winding station. The track is run in such a way that it is constantly enters the inlet gap without wrapping. The diameter of the The pressure roller is as small as that of a normal web guide roller. she is therefore, due to the lack of sufficient flexural rigidity, it is not arbitrary for application suitable for high line forces, especially not for extremely large web widths (up to approx. 10 m).

A special facility promotes a secondary drum and the pressure roller coupled to him up to the level of the winding station from which a previously wound paper roll has been removed. The necessary for this Lift drive requires a complex construction.

This document describes the following procedure:
An empty reel is mounted on a vertical slide together with the drive-less pressure roller mentioned. Drum and pressure roller can be moved up and down on the slide mentioned. First the reel is wound in a first upper position. It is then lowered onto horizontal rails, together with the pressure roller, and brought into a fixed first position on the rails. The winding process continues during these processes. In this first position, the paper web is wound up to the full roll, then brought into a delivery position and removed from the machine.

• die Papierbahn berührt eine Anpreßtrommel;
• die Anpreßtrommel ist in horizontaler Richtung verfahrbar und befindet sich anfangs in einer Ausgangsposition;
• der erste Tambour wird in eine erste Position verbracht, in der er mit der Bahn Kontakt hat; wobei der erste Tambour auf Bahngeschwindigkeit beschleunigt wird, bevor er mit der Bahn in Kontakt kommt; und wobei der erste Tambour in der ersten Position mit der Anpreßtrommel einen Spalt bildet, durch den die Papierbahn läuft;
  der erste Tambour ist in der ersten Position stationär;
• zum Bilden eines neuen Bahnanfanges wird die kontinuierlich laufende Papierbahn durchgetrennt und auf den rotierenden ersten Tambour gewickelt;
• vom Anfang jedes Wickelvorganges bis kurz vor dessen Ende wird die horizontal verfahrbare Anpreßtrommel gegen die Mantelfläche der entstehenden Papierrolle gedrückt, zwecks Steuerung der Linienkraft (L) zwischen der Anpreßtrommel und der Papierrolle;
• während des gesamten Wickelvorganges wird mittels eines Zentrumsantriebs ein Drehmoment in die Achse des ersten Tambours eingeleitet;
• zu einem bestimmten Zeitpunkt des Wickelvorgangs wird der erste Tambour in eine zweite stationäre Position verfahren, in der er bis zum Ende des Wickelvorganges verbleibt;
• kurz vor dem Ende jedes Wickelvorganges werden die Anpreßtrommel und die Papierrolle voneinander getrennt;
• die Anpreßtrommel wird in die Ausgangsposition verfahren, wonach sich das Verfahren mit dem zweiten Tambour wiederholt.

Document (8), DE 44 15 324 A, discloses in detail a method for winding a continuously running paper web, first onto a first reel and then onto a second reel, so that a paper roll is produced on each reel, with the following features:

• the paper web touches a pressure drum;
• the pressure drum can be moved in the horizontal direction and is initially in a starting position;
• the first drum is brought into a first position in which it is in contact with the train; wherein the first reel is accelerated to web speed before contacting the web; and wherein the first drum forms in the first position with the pressure drum a gap through which the paper web runs;
  the first drum is stationary in the first position;
• to form a new beginning of the web, the continuously running paper web is cut and wound on the rotating first reel;
• from the beginning of each winding process until shortly before its end, the horizontally movable pressure drum is pressed against the outer surface of the resulting paper roll, in order to control the line force (L) between the pressure drum and the paper roll;
• During the entire winding process, a torque is introduced into the axis of the first reel by means of a center drive;
• at a certain point in time of the winding process, the first drum is moved into a second stationary position, in which it remains until the end of the winding process;
• shortly before the end of each winding process, the pressure drum and the paper roll are separated from each other;
• the pressure drum is moved to the starting position, after which the process is repeated with the second drum.

In the method according to document (8), the drum is also in one first position just wrapped, then lowered onto the rails and then finished wrapped in a second position. When putting on the Rails may experience an impact that affects the circumferential force, so that there is again an inconsistent winding hardness.

Another important disadvantage of this method is that the Paper web directly in the press nip between pressure roller and drum is introduced, i.e. without it wrapping around the pressure roller. The Inventors have recognized that this creates air pockets between individuals Layers of the resulting paper roll leads.

US 3 857 524 A shows and describes a winding machine which according to the Poperoller principle works. A carrying drum serves among other things. to start of a first drum. Alternatively, there is a reel spooling device or "accelerator" provided. Of the Drum is swung around the circumference of the carrying drum and arrives on horizontal rails, whereby it is pressed against the carrying drum becomes. After cutting the running web, the winding process begins on the drum. By means of the carrying drum on the circumference of the Tambours and the resulting paper roll transmit a torque. The In this case, winding takes place exclusively by applying the circumference attacking force. As soon as the paper roll is full, it is driven by means of an "enveloper roll", removed from the carrier drum, to make room for one to create the following empty drum. The disadvantage of this machine is similar to the machine according to document (1). In addition, for the drum has no central drive. This is the structure of the Winding hardness not controllable at will; also the web tension between the carrying drum and the winding roll removed from it - for that Cutting the web - can not be controlled arbitrarily.

EP 0 483 092 A relates to the following method: An empty reel is opened Web speed accelerated, then on horizontal rails placed on, pressed against a "winding cylinder", and the beginning of the web is opened the empty drum. The paper web is then up to the full roll wound up. The winding cylinder is stationary, while the reel is with the emerging role according to their growth on the rails is moved. A center drive and a peripheral drive act here on the role. If the roll is full, it will be in a delivery position spent and removed from the machine while a new empty reel accelerated and lowered onto the rails. Here too it is (as with Document 1 and 7) not possible the line force between the Winding cylinder and the resulting roll are sensitive enough to any Set values.

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 of the roll from the beginning to the end of the Winding process has the desired course, i.e. that the winding hardness is under control at every moment of the winding process. With in other words: the course of the winding hardness should increase Roll diameter can be adjusted as desired; e.g. constant or easy increasing or (preferably) slightly decreasing, but always steady. in the The core area is usually a particularly high one, but sometimes also one relatively low winding hardness required (see the unpublished WO 97 01502 A). If necessary, the winding hardness should also be applied without application a line force between the resulting winding and the outer surface of the Pressure roller can be influenced. In other words: that Torque for the central reel drive and the specified line force must be independently adjustable within wide limits. A additional requirement may be that the longitudinal tension of the approaching path - again independent of the other sizes - is adjustable. Nevertheless, the mechanical effort should of course be as possible be kept low.

This object is achieved by the features of independent claim 1.

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 along the circumference of the drum during the winding process,
abrupt placement of the wound drum on the guideway, impacts and thus irregularities caused by the transfer of the drum from the primary lever pair to the secondary lever pair, irregularities when changing the drives. An important finding is that the properties of the finished paper roll are created to a decisive degree in the first phase of the winding. The inventors have further recognized that even the slightest irregularities during winding can be extremely harmful if these irregularities occur in the first phase mentioned. Such irregularities can consist, for example, in that the paper roll is wound up in a first station, moved to a second station and finished winding in this second station if vibrations occur.

All of this is avoided by applying the invention. During the critical area of winding the resulting paper roll becomes absolute kept calm, free of any bumps. Got the drum wound paper layer reaches a certain thickness, for example that 0.2 times the target layer thickness, the drum can be Finished winding position are transferred, without affecting the winding quality hurts. There is also no up and down movement - contrary to that Procedure according to document (8). In one variant, the remains Drum with the emerging paper roll in one and the same "Winding position". In all variants, the machine is extremely simple Construction. In addition, the inventors consistently focused on the central drive concentrated, which is the most important means to the course of the winding hardness to control during the winding process. This has the advantage that the centrally applied torque is a "wrapped" web tension is created, which is completely continuous, and that during the entire winding process can be kept constant or changed continuously. So it occurs no jumps in the web tension, so that the winding hardness is kept under control during the entire winding process by it can be set to any value. Deviates from document (8) the pressure roller as a rigid and provided with a drive "Press drum" trained. This achieves two things: The "Wrapped" web tension can be controlled by controlling the two drives are regulated particularly sensitively. The line force is independent of this anywhere between the pressure drum and the winding roll adjustable, e.g. between 0.2 and 3.0 kN / m, also if desired very low values.

According to the invention, the proven center drive is used at simultaneous application of a line force, which on the mantle of the emerging Paper roll attacks, by means of the pressure drum.

The inventors recognized the following in detail:
The line force to be applied to the jacket of the paper roll has an outstanding influence on the winding result. The smallest changes in this line force lead to a disproportionate influence on the winding hardness. Sharp deflections of the roll during winding, especially during winding, are harmful. Such diversions are avoided according to the invention.

Furthermore, the paper roll remains in during the winding process essentially in one and the same place - either in the winding position, or in the finished winding position. Only the pressure drum is used accordingly postponed the role growth, not the heavy role itself Pressure is therefore sensitive.

The invention is explained in more detail with reference to the drawing.

Figures 1 to 6 show six different work phases one first embodiment of a winding machine according to the invention.

FIGS. 7 to 9 and 10 and 11 show further exemplary embodiments.

The machine comprises a horizontal slide 1, which is on a guideway 2 can be moved in the horizontal direction. The horizontal slide 1 carries one Pressure drum 3. This has a drive. The bearings 3a of the Pressure drum 3 are on by means of a short-stroke force sensor 3.1 ("Sensomat") the horizontal slide 1 can also be moved horizontally. Of the Horizontal slide 1 also carries a scraper 3.2 for temporary Lead the paper web (as a committee) down.

There is a horizontal distance from the horizontal slide 1 Device 4 for supporting the resulting paper roll 9 flat (Support device). The support device 4 is only indicated schematically here. It can have different embodiments. So she can for example, comprise two rollers parallel to the paper roll, one by one Support band are wrapped.

A pressure roller 5 is provided in the area of the support device 4. This extends over the entire width of the paper roll 9.

The new drum 8 has a device 7 for accelerating it assigned (accelerator). In the present case, the Accelerator rollers 7.1, 7.2 and a drive belt 7.3.

In the working phase shown in Fig. 1, the paper roll 9 is almost finished wrapped. The horizontal slide 1 is in [s] on the right [Extreme] position. The pressure drum 3 is still on the circumference of the paper roll 9 on. The pressure roller 5, however, is not yet on the circumference of the paper roll 9 on.

2, the horizontal slide 1 is in its left Extreme position (starting position) retracted. The pressure roller 5 lies now on the circumference of the paper roll 9. It was created before Moving the horizontal slide 1 created so that there is no pressure-free Period of time there. The new Leertambour 8 is located in Ready position and is based on the speed of the paper web 10 accelerates.

3, the new empty reel 8 is in its Working position lowered. Here he lies on a pair of rails, this one is not shown, but which extends in the horizontal direction and below the axes of the pressure drum 3, the drum 8 and the Paper roll 9 runs.

4, the paper web 10 was cut so that a The beginning of the path is created. This is with the help of a blow nozzle on the scraper 3.2 and a further blowing nozzle 3.3 wound on the reel 8.

In the phase according to FIG. 5, the new paper roll 9.1 has a certain Diameter (better: a certain layer thickness) reached. The finished one Paper roll 9, however, has already been removed from the machine. In the 6 is the new, emerging paper roll 9.1 in the Finished winding position on the support device 4. It was there on the mentioned rails move, her the horizontal slide 1 with the Press drum 3 followed, the outer surfaces of the resulting paper roll 9.1 and the pressure drum 3 constantly put against each other.

In the embodiment according to Figures 7 to 9 is the winding machine equipped with a hold-down device 12. This includes one Swivel arm 12.1 with a hold-down roller 12.2. Figures 7 to 9 illustrate three different phases. The one shown in FIG Phase is the hold-down device in its inoperative position pivoted.

In the phase according to FIG. 8 there are horizontal slides 1 and finished paper roll 9 separated from each other in the horizontal direction, so that a space for the descent of the new drum 8 is created.

In the phase according to FIG. 9, the hold-down device 12 is in its Working position pivoted in which it holds down the paper web 10. Therefore the new empty reel 8 could be lowered onto the rails, without being started beforehand.

It is now possible to couple it to a central drive. This then accelerates the empty reel 8 to Machine speed, after which the hold-down device 12 again is swung up. At the same time, the horizontal slide 1 moves that pressure drum 3 and drum 8 come into contact and a new one Winding process can run according to Figures 4 to 9.

Figure 10 illustrates the process flow in three phases, A, B and C of the winding process. The positions the resulting or finished paper roll is marked with I and II featured.

In phase A, the winding process is nearing its end; the winding roll 9 is in the winding position.

In position B, the winding roll 9 is in its end position; a new Empty reel 8 is accelerated to web speed.

In position C, the empty reel 8 is inserted into the winding position.

FIG. 11 shows the same object as FIG. 10, but without a pressure roller 5. Here, the pressure drum 3 goes briefly with the winding roller 9 in the End position.

Claims (6)

1. Method for the winding of a continuously running paper web first onto a first drum and then onto a second drum, so that a paper roll arises on each drum, with the following features:

   a) the paper web runs via a driveable pressing drum;

   b) the pressing drum is movable in the horizontal direction and is located initially in a starting position;

   c) the movement of the pressing drum takes place without a change of direction exclusively in the horizontal direction;

   d) the first drum is brought into a first position in which it has contact with the web; with the first drum being accelerated to web speed before it enters into contact; and wherein the first drum in the first position forms a gap with the pressing drum through which the paper web runs;

   e) the first drum is stationary in the first position;

   f) for the formation of a new web start the continuously running paper web is cut and wound onto the rotating first drum;

   g) from the start of each winding process up to shortly before its end, the horizontally movable pressing drum is pressed against the jacket surface of the arising paper roll for the purpose of controlling the line force L between the pressing drum and the paper roll;

   h) during the entire winding process a torque is introduced into the axle of the first drum by means of a center drive;

   i) at a specific time point of the winding process the first drum is moved into a second stationary position in which it remains until the end of the winding process;

   j) the movement of the first drum into the second stationary position takes place directly from the first stationary position and indeed without change of direction exclusively in a horizontal direction;

   k) shortly before the end of each winding process the pressing drum and the paper roll are separated from another;

   l) the pressing drum is moved into the starting position, whereafter the method is repeated with the second drum.
2. Method in accordance with claim 1, characterized in that the movement of the drum from the first stationary position into the second stationary position takes place on achieving a specific first layer thickness of the paper roll (Figs. 5 and 6).
3. Method in accordance with claim 1, characterized in that the movement of the drum from the first stationary position into the second stationary position takes place when the paper roll wound onto the drum has almost its desired layer thickness (Fig. 10 or Fig. 11).
4. Method in accordance with claim 2, characterized in that the first layer thickness amounts to at least 0.1 times and preferably 0.3 times the desired layer thickness.
5. Method in accordance with one of the claims 1 to 4, characterized in that the pressing drum (3) is movable relative to a horizontally movable carriage (1) for the purpose of the said control of the line force (L) between the pressing drum and the paper roll and in that the carriage is movable at a speed which corresponds to the increase in diameter of the paper roll per unit of time.
6. Method in accordance with one of the preceding claims, characterized in that the arising paper roll is areally supported in the position (II, Fig. 1 or I, Fig. 10) in which it at least approximately achieves the desired layer thickness.

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