FI86051C - FOERFARANDE FOER RULLNING AV EN PAPPERSBANAN. - Google Patents

Description

5,86051

Paper web roll rolling method Förfarande för rullning av en pappersbanan

The invention relates to a method for winding a paper web.

A method of winding a paper web is known from the prior art, in which the paper web from the web 10 is fed onto a filling paper web roll by simultaneously pressing said roll against the surface of a motor-driven winding cylinder. This rotation of the web roll thus takes place at the same speed at which the winding cylinder is rotated. With separate load arms, the rotated paper web roll is pressed onto the winding cylinder 15 as the filled paper web roll rests on so-called rails, whereby the rails receive the load caused by the entire vertical paper web roll.

When the paper web roll is filled, a new iron should be brought to the final winding-20 position as flexibly as possible. In the prior art solutions, the continuity of the winding is managed so that the separate lowering arms pick up the next iron in the position above the winding cylinder. A new iron, i.e. a winding core, is put into rotation as the exchange event approaches. The iron is given a rotational speed similar to that of the winding cylinder 25 and the iron is brought to the upper surface of the winding cylinder. Because the iron is heavy and massive, it causes a large load against the winding cylinder. To alleviate this weight load on the iron, the exchange forks are provided with a cylinder device which lightens the iron so that it presses against the winding cylinder 30 with a suitable force.

In the next step, the iron rotating against the surface of the winding cylinder is displaced adversely on the outer surface of the winding cylinder on the winding cylinder surface, and this transfer is further effected by means of exchange forks. The compressed air blowing cuts the web of paper and places the end of the web on the surface of the new iron immediately after cutting. The full roll of paper web is then moved from the outer surface of the winding cylinder by means of the winding forks and the winding forks are brought to another extreme position where the paper web roll rests on the rails and the rails are slightly inclined to the horizontal, the full roll rotates to the braking position.

5 When the winding forks have released a full roll of paper web onto the rails, the winding forks move back into the feelings of the winding cylinder to receive the new filling wood transported by the replacement forks. At a certain stage, both the winding forks and the replacement forks are in contact with the spool rotated by the winding cylinder. In this step, the working cylinders of the load arms must operate in such a way that the filling roll transfer from the change forks to the winding forks takes place flexibly without a sudden change of load, which would have a detrimental effect on the formation of paper web layers and thus roll density.

U.S. Pat. No. 3,857,524 discloses a solution in which a transfer and loading member is connected to the arms 21.

The aforementioned transfer step from the shift fork to the winding fork is critical in the winding operation. The object of the invention is therefore an improvement 20 to a paper web winding method just mentioned above. The invention has realized the formation of a completely new type of paper web roll winding method, in which the main idea is that the formation of a new web roll takes place in a fixed winding station throughout the winding. In contrast to U.S. Pat. No. 3,857,524, our invention differs from the specific one in that the iron can be loaded against the winding cylinder while the finished roll is moved by separate transfer arms away from the winding station. The new rolling can therefore start immediately. In the prior art, the actual loading of new iron on the loading arms can only begin after the arm has removed the roller and the arm has moved into the vicinity of the cylinder.

The method according to the invention is mainly characterized by. that the method uses separate transfer arms to move the filled web roll from the winding station to the braking station, and that in method 35 the rolling in the winding station is performed with separate load arms, in which case the rolling takes place in the fixed winding station by pressing

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3 86051 paper web roll with separate load arms on the surface of the winding cylinder.

According to the invention, a new iron is moved to a position above the winding cylinder and said iron is rotated at the same speed as the winding cylinder. The iron is then lowered onto the top surface of the winding cylinder and the new iron is allowed to rotate rotated by the winding cylinder. The difference with the prior art solution is that the paper web is not cut at this stage. The new iron is moved by the 10 exchange forks, held by the locking jaws of the exchange forks, to the lower position in the so-called actual rolling position on the rails. During said transfer, the full paper web roll is moved backwards by separate transfer arms, whereby the load arms have released their grip on the filling paper web roll as the transfer arms move the filling roll 15 on the rails towards the braking station. When the filling paper web roll has moved a sufficient distance towards the braking station, the new iron can be lowered to the actual rolling station on the rails with replacement forks. The load forks then engage the iron rotated by the winding cylinder and the paper web is cut from the area between the spool and the full roll 20. The blowing is used to guide the end of the paper web around the rotating new iron. In that winding station, the iron is located on rails and the rails receive the entire weight of the iron. The load against the winding cylinder itself takes place with load forks. Thus, already at the bottom layer of the paper web, the winding takes place in the standard position 25 without any load peaks or other similar possible discontinuities leading to uneven winding at that constant position.

The invention will now be described with reference to some preferred embodiments of the invention shown in the figures of the accompanying drawings 30, to which, however, the invention is not intended to be exclusively limited.

Figure 1A shows in principle the first step of the cumbersome method of the invention, in which the paper web roll is still pressed against the winding cylinder.

4,86051

Fig. 1B shows the step of the method according to the invention, in which the transfer arms have started to move the full roll of paper web towards the braking station. Fig. 1C shows the cutting of the paper web W.

Figure ID shows the step of the method according to the invention, in which the exchange forks have moved the new iron to the winding station and the locking jaws of the exchange forks have released the grip on the iron and the exchange forks have gone up.

Figure 1A shows the step of the method according to the invention, in which the paper web W is wound on iron 10a and a full paper web roll 11 is formed. The paper web roll 11 is pressed against the rotating winding cylinder-15 12 by a load arm 13. The paper web roll 11 is thus pressed from the surface onto the outer surface of the winding cylinder 12 and the winding cylinder is further rotated by motor operation.

Fig. 1A also shows a step of the method in which a new iron, i.e. a wedge core, has been lifted by the lowering arms 14 from the iron warehouse to a position above the winding cylinder and the exchange forks have moved the iron into surface contact with the winding cylinder 12. The locking jaws 15 of the exchange forks 16 hold the iron in the exchange forks. No relief is needed anymore.

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Already at the stage when the new iron 10b is lowered onto the outer surface of the winding cylinder, the transfer arms 17 start to move the roller 11 towards the braking station 18. Before that, however, the iron 10b is given the same rotational speed as the winding cylinder 11.

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Fig. 1B shows a step of the method according to the invention, in which the filling paper web roll 11 is moved by separate transfer arms 17 • towards the braking station 18. This transfer takes place when the iron 10a rests - the rails 19 and the rails 19 accept the common weight of the whole paper web roll 11 * * 35 and iron 10a. In the phase of the figure, the actual load arms 13 have detached their grip from the paper web roll from its tampon iron 8a. At this stage of the winding operation, when the transfer arms 17 move the roll 11 away from the connection of the winding cylinder, the rotation of the paper web roll 11 is slowed down. The loose paper web W is indicated in the figure by the reference letter. At the same time as the roll 11 is moved by the transfer arms 5 towards the braking station, the new tampons 10b are moved downwards towards the winding station R by the exchange forks 16.

In the step of Fig. 1C, the rotating tampon has been moved in the locking jaws of the exchange forks towards the winding station R. The paper web is still cut -10 tons. Figure 1C shows, in dotted lines, the step of cutting the web by bottom blowing. The blowing further promotes the rotation of the end of the broken web around the iron 10b. The cutting of Figure 1C takes place at the stage where the new iron 10b is located on the rails. Prior to the change, the load arms have made contact with the iron and the locking jaws have released their grip on the iron 10b. At the winding station R, the rails receive the entire vertical load of the iron. The loading arms cause the iron 10b to press against the outer surface of the winding cylinder.

Fig. 1D shows the step in which the full roller 11 is located in the braking device and the exchange forks with the locking jaws opened start to move back to their initial position. Rolling in position R starts.

The method according to the invention enables better rolling control. The method according to the invention has only one winding station R, whereby the formation of the base is stable. The resulting web roll thus becomes more uniform in density. Thus, the total amount of paper web scrap decreases. The method according to the invention makes it possible to use a rolling cylinder with a smaller diameter. Thus, a stronger effect of 30 nip effects is obtained. The method according to the invention also - simplifies the winder control system. According to the invention. the method does not require pressure adjustment of the locking jaws, no precise control system for the cylinders of the replacement forks and, in particular, no replacement. ‘T load balancing between rolling forks, as required: 35 e.g. in prior art solutions, nor is a relief system required. When using one winding station R, it is also possible to use a 6 86051 compensated winding cylinder. The use of a deflection-compensated winding cylinder has not been possible in prior art solutions where the winding station is formed of a curved track.

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Claims (2)

A method for winding a paper web, the method comprising rotating a paper web roll (11) by a winding cylinder (12) by pressing the paper web roll 5a (11) on the surface of a motor-driven winding cylinder (12) by loading arms (13) and moving the full paper web roll (11) by rails (19) towards the braking station (18) with a new iron (10b) in place of the old roll (11), and in which method the paper web (W) is wound in only one winding station (R) 10 around the iron (10b), and that at the beginning of the method a new iron (10b) moving the iron stock to a position above the winding cylinder (12) and adhering to the upper surface of the winding cylinder (12) after the iron is given the same rotational speed as the winding cylinder (12) and moving said rotating iron (10b) along the outer surface of the winding cylinder (R) ) without the paper web (W) rolling around the iron (10b) e during said transfer and that the winding of the paper web (W) around the iron (10b) takes place only at the winding station (R) and that at the same time as the filling paper web roll (11) is moved by the transfer arms (17) towards the 20 braking stations (18), new iron (10b) is transferred on the surface of the winding cylinder (12) towards the winding station (R) when the paper web (W) is cut only in the winding station (R), characterized in that the method uses separate transfer arms (17) to move the filled web roll (11) from the winding station (R) to the braking station (18) and in the method, the winding in the winding station (R) is performed by separate load arms (13), whereby the winding takes place in the fixed winding station (R) by pressing the paper web roll (11) with separate load arms (13) on the surface of the winding cylinder (12). 1 35 Method according to the preceding claim, characterized in that the paper web (W) is cut in the area between the winding station (R) and the filling paper web roll (11), the cutting taking place when the full paper web roll (11) is moved towards the braking station (18) with the iron (10b) brought into the winding station (R). 8 86051