FI111003B - The method of changing the roll in the reel and the tape used in the method - Google Patents

Description

111003

The present invention relates to a method of changing a roll in a reel of a paper or board machine or a paper or board finishing apparatus, in particular to a continuous belt rewinder, and a method of decreasing the speed of the web.

10 In the paper web reel, the so-called. After the calender, the pope scroller or the center-assisted pope scroller rolls the finished paper around a reel core such as a reel reel. The winding itself is accomplished by loading the winding core against the winding cylinder through which the web to be wound passes to form 15 finished rolls around the winding core.

This part of the paper machine must also operate uninterrupted and receive continuous paper from the preceding parts of the paper machine. In this case, when the old roll is full, the web must be cut and the web after the cut-off point 20 started to be wrapped around the new winding core. In practice, this is accomplished by moving a new empty reel core, e.g., a reel roll, into contact with the paper web when the paper roll has grown to full size, and then the paper web 25 is cut off in some suitable manner and the end of the web new rolls.

The most critical steps in winding are just cutting the paper web and getting 30 new ends around the empty reel core. To avoid unnecessary wreckage, switching should be a hassle. Ideally, getting the new end of the web cleanly against an empty core such as * reel many methods are known depending on the surface weight of the web.

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As a replacement, bag change is commonly used, which is suitable for all species, but which usually causes a larger amount of bottom shelf and can cause adverse impacts to the reel. Another way is the so-called.

goose neck replacement, which does not have the above problems but is only suitable for thin species. A third way is the tape exchange, which is the subject of the present invention.

In belt change, cutting and guiding the web to a new reel is generally done using a tape that is led into a nip between the reel core and the reel cylinder near the end of the reel core and reel cylinder 10.

The devices used for tape replacement are described e.g. In GB-15, 1,135,945, U.S. Patent 4,711,404, and F1-Publication 74679.

20

Paper machine speeds today are generally 20 m / s or more, and the goal is, of course, to achieve ever higher speeds. Breaking a fast-moving web is not a problem in itself, and speed forces can even be utilized in cutting. The critical point is to bring the end of the new web immediately against the peripheral surface of the reel reel and to follow it at high peripheral speed and to prevent it from being uncontrollably wandered or misplaced on the reel reel after cutting. This problem gets worse as the body weight increases.

In addition, unlike winder winding, a continuous-action winder does not glue the end of the web to the winder core before winding begins, as in winder winding, since prior art gluing would require stopping the machine. Bonding is used with winders because when used as a reel core, a disposable core can over time slip between the bottom layers of the roll and the core. The skidding mentioned above can be caused, for example, by changes in the humidity of the air, as a result of which the diameter of the core is reduced more rapidly than the diameter of the web rolled thereon, whereby the bottom of the roll becomes loose. The slippery bottom degrades or even prevents the roll from unwinding, 5 which causes it to be wrecked.

The purpose of the method of the present invention is to eliminate or at least reduce the problems arising from the above-mentioned prior art and to provide a method for changing the roll in a paper machine reel at full speed and a method for immediately gluing the new end of the web. Among other things, to accomplish this purpose, the method and tape of the invention are characterized by what is set forth in the characterizing parts of the appended independent claims.

Preferably, in the process of the invention, the adhesive in the tape is brought to the activating state of the adhesive at or after the roll change. In this context, adhesive 20 is meant to be an adhesive which is disposed on both surfaces of the tape as an intermittent or continuous adhesive surface.

According to a preferred embodiment of the invention, the activation of the gripping surfaces 25 is effected by the compression pressure between the winding core and the winding cylinder. According to one embodiment, at least part of the adhesive surfaces of the tape are activated by radiation applied to the tape, such as heat or UV radiation. According to a further embodiment, at least part of the adhesive surfaces of the tape are activated on the tape; 30 with the moisture to be applied. The activation of the adhesive surfaces can also be accomplished by some other chemical or physical phenomenon. The manner in which the adhesive surfaces are activated depends on the characteristics of the adhesive * used.

35 When the tape adhesive is activated only at or after the roll change, handling and transfer of the tape to the nip is easier because the 4 111003 adhesive is dry and resistant to handling. The adhesive is not activated, e.g., when the tape is in a roll, but only under certain well-defined conditions.

In a preferred method of the invention, a tape is used, both sides of which are at least partially treated with an adhesive, such as an adhesive or tape, which is activated, i.e. becomes tacky, only after activation on the tape. The adhesive located on both sides of the tape adheres the bottom layers of the web to be rolled onto the reel core 10 to tighten the bottom of the roll.

Preferably, the tape of the invention is at least partially treated with an adhesive, which is activated on both sides of the tape, as a result of activation applied to the tape.

According to a preferred embodiment of the invention, the adhesive is a pressure-sensitive adhesive or tape that is activated when the pressure of the adhesive exceeds the threshold pressure of the adhesive. In one of the 20 preferred embodiments, the adhesive has a threshold pressure greater than 1 MPa.

According to another preferred embodiment of the invention, the adhesive is sensitive to heat or UV radiation. According to a third preferred embodiment of the invention, the adhesive is sensitive to moisture.

According to a preferred embodiment of the invention, the adhesive on the surface of the tape has an activation delay which determines the time taken from the activation procedure applied to the tape 30 to the activation of the adhesive. Due to the activation delay, the tape does not adhere to the surface of the winding cylinder, but the adhesive effect only begins inside the roll.

In one embodiment of the invention, the activation delay is typically at least 0.01 seconds and preferably 0.01 to 0.25 seconds.

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The invention will now be described in more detail with reference to the accompanying drawing, in which Figure 5 illustrates a paper or board machine reel using the method and tape of the invention, Figure 2 illustrates part of a longitudinal cross-section of the tape of the invention;

Figure 1 is a schematic representation of a paper machine reel based on a so-called. Pope-type reel-up. The roller continuously forms rolls W of paper W from a full-width, paper machine or paper finishing apparatus, one of which is complete is indicated by the letter R. The roller shown in the figure comprises a a reel roll for a new roll of paper. The reel further comprises a transport profile 4 for guiding the web 5 for cutting the web between the reel cylinder 2 and the above reel core 3. This spacing is denoted by reference numeral 6 in the figure. Preferably, the roller is 25 center-driven, i.e. in addition to the winding cylinder, the winding core 3 is provided with a drive (not shown). Shifting is performed at travel speed.

The tape 5 is fed along the transport profile 4 by a feed mechanism 7 which typically includes a feeder which dispenses the tape from a 5: 30 stock roll to the transport profile 4 and a tape breaker which cuts the tape 5 to the correct length after cutting the web. The aforementioned devices are known in the art and are therefore not described in further detail.

Figure 2 shows schematically the structure of the tape 5 according to the invention. On both sides of the tape core 8 there are activable adhesive surfaces 6 obtained by treating the core 8 with a pressure sensitive adhesive used as an adhesive, which is activated, i.e. becomes adhesive, only after a certain threshold pressure. The gripping surfaces 9 may be uniform throughout the web, or the gripping surfaces 9 may be intermittently on the web surface.

In the process of the invention, the above-described winder is used as follows: In preparation for cutting the web W, a suitable amount of tape 5 is fed by a feeder 7 along a transport profile 4 at this point between the winding cylinder 2 and the winding core 3 To secure the end of the ribbon to the surface of the reel core 3 outside the web, there may be a device at the end of the transport profile that immediately applies an adhesive to the end of the ribbon, such as disclosed in US 4,711,404. Alternatively, a piece of label material, which is a material capable of mechanically engaging the end of the winding core 3, may be provided at the end of the tape 5 and for this purpose the end of the winding core 3 may comprise a special sticker The web cutting is started so that the winding core 3, previously accelerated to a corresponding peripheral speed (e.g., actuation in the start winding device 10) as the winding cylinder 2, is lowered onto the web W on the winding cylinder 2, thereby closing the nip 6. Devices for accelerating and guiding the winding core are generally known and therefore are not described in more detail herein.

As the nip 6 closes, the end of the tape 5 is between the winding core 3 and the winding cylinder 2, and the end of the tape 5 engages the surface of the winding core 3. As a result of the rotational motion of the scrolling core, the tape 5 is twisted and tightened to release its free end starting from the transport profile 4 and is tensioned between the nip 6 and the feeder 7, striking across the web W, spirally wounding During the steps 35 described above, the tape passes through the nip 6. Subsequent layers of the new roller overlie the tape around the core 3.

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As the tape 5 passes through the nip 6, the pressure-sensitive adhesive used as the adhesive on the gripping surfaces 9 is activated and the bottom layers formed from the web W are rolled onto each other, whereby the bottom 5 becomes tight. Activation pressure is facilitated by the fact that the pressure applied to the tape itself in the nip is higher than the pressure produced by the nip line load on average due to the extra thickness provided by the tape. The adhesive activation delay is such that the tape 5 does not adhere to the surface of the winding cylinder 2, but the adhesive effect 10 only begins within the resulting roll when the tape is already covered by the paper that has entered the core.

The invention is not limited in any way to the embodiment described in the preceding description, but may be varied within the scope of the inventive idea set forth in the claims. The adhesive surfaces 9 of the tape of the invention may also be provided by a material other than an adhesive, such as tape or the like. The gripping surfaces 9 may also be made of another material that can be activated. The adhesive 20 may be activated by, for example, heat or UV radiation or moisture or other chemical or physical phenomenon applied thereto. In this case, the reel used in the method comprises the necessary accessories, such as humidifiers or radiators, for activating the ribbon. Such a humidifier, radiator or other activating device 25 is possible to arrange e.g. the ends of the winding core 3 in a replacement position on a supporting initial winding device 10 and the activation operation can be accurately synchronized according to the moment of changing. The strip 5 may also comprise surfaces other than those mentioned above, and may also be fabricated such that the core 8 is made of an activable material whereby; 30 requires a surface to be added over core 8.

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Fig. 3 is a side view of a situation where the ribbon 5 is wound around a winding core 3. The device which contactlessly applies the activating action to the tape 5 is denoted by the reference numeral 11. The device 35 11 is directed towards the surface of the winding core 3 so as to apply, for example, water jet, UV radiation or thermal radiation to the tape. It is possible that the tape can be affected even if it is already covered with paper coming from a new roll. Also in these activation modes, the tape adhesive can be activated with a certain delay, but it is not necessary if, after the activation procedure 5, the tape no longer comes into direct contact with the winding cylinder 2. The scrolling core 3 is shown in two parts. Its inner part 3a is formed by a multiple-use reel reel used in the retractors, the end of which is provided with a coupling piece for connecting it to an external drive motor for rotating the reel reel and the reel. The outer part, or topsheet 3b, of the reel core is formed by a sleeve arranged around the reel roll, which can be pulled out of the reel reel and inserted into a new one. This sleeve may be, for example, cardboard. The invention is particularly well suited to cases where the reel core 3 has a disposable topsheet 3b 15 as shown in Figure 3, but can in principle be applied to all reel cores around which paper or board web is collected to form the reel.

In addition, other paper and board machine downstream peripherals, such as a full paper roll conveyor 20 and a new reel core conveyor, have been neglected in the previous description because they are independent of the invention and such well known solutions can be used.

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Claims (13)

A method of rolling a wheelchair in a wheelchair of a paper or cardboard machine or in a paper or cardboard finishing machine, in which the process of cutting the paper or cardboard web (W) and guiding it to a new roll is performed using a tape (5) which is guided in contact with a rolling core (3), whereupon the belt placed on the rolling core simultaneously cuts the web (W) and controls the cutting point following the new tip of the web around the rolling core, characterized in that the belt (5) is provided. with an adhesive which is brought in the exchange moment of the roll or thereafter in an activating condition of the adhesive. 2. A method according to claim 1, characterized in that at least part of the adhesive surfaces of the belt (5) is actuated with the pressing pressure between the rolling core (3) and the rolling cylinder (2). 3. A method according to claim 1, characterized in that at least part of the adhesive surfaces of the strip (5) are activated with radiation directed to the strip 20, such as heat radiation or UV radiation. 4. A method according to claim 1, characterized in that at least part of the adhesive surfaces of the strip (5) are activated with moisture directed at the strip. 25 5. A method according to any of the preceding claims, characterized in that a method (5) is used in which the two sides of the bed are at least partially treated with the adhesive, such as glue or tape, which is activated, i.e. becomes adhesive only after an activation of the tape .30. Method according to any of the preceding claims, characterized in that a rolling core (3) comprising an inner part (3a) and around it a removable, preferably a bunch of useful outer layer (3b) is used, such as a cardboard sleeve. 111003 7. Tape used in cutting and reeling a paper or cardboard web, characterized in that the two sides of the tape (5) are at least partially treated with an adhesive which is activated in the adhesive state by an actuation directed to the tape. 8. A tape according to claim 7, characterized in that the adhesive consists of pressure-sensitive adhesive or tape, which is activated when the pressure directed against the adhesive exceeds the threshold pressure of the adhesive. 9. A strip according to claim 8, characterized in that the threshold pressure of the adhesive is preferably above 1 MPa. 15 Band according to claim 7, characterized in that the adhesive is sensitive to this heat or UV radiation. 11. A tape according to claim 7, characterized in that the adhesive is sensitive to moisture directed thereon. 12. A tape according to any of claims 7-11, characterized in that the adhesive present on the surface of the tape has an activation delay which determines the time that elapses from the activation action directed on the tape to the activation of the adhesive. 13. A band according to claim 12, characterized in that the [30] activation delay is typically at least 0.01 second, preferably 0.01 - 0.25 second.