EP3697709B1 - Unwinding station - Google Patents

Description

The invention relates to a method for unwinding a material web, in particular paper or cardboard web, for a subsequent machine unit for processing the material web, with an unwinding station which comprises a primary unwinding device, at least one secondary unwinding device and at least one gluing and separating device, wherein the winding roll is first unwound in the primary unwinding device and after its transfer in a secondary unwinding device and a new winding roll is inserted into the primary unwinding device and the gluing and separating device, when changing rolls, the material web of the secondary unwinding device with the material web of the new one The winding roll connects and cuts the web of material running from the secondary unwinding device to the glue point.

The invention also relates to an unwind station for unwinding a material web, in particular paper or cardboard web for a subsequent machine unit for processing the material web with a primary unwinding device, at least one secondary unwinding device and at least one gluing and separating device, in particular for carrying out the method.

Unrolling stations of the type discussed here are z. B. from the publication DE 10 2016 211 582 A1 known. They serve for the continuous unwinding of a material web from a winding roll and are arranged upstream of a machine for processing the material web, for example a coating machine or a calender.

A known unwinding station comprises a primary and a secondary unwinding device which serve to guide a winding roll. A full winding roll is first guided by the primary unwinding device while the material web is being unwound. When the winding roll has a desired diameter, it is transferred from the primary to the secondary unwinding device.

A new, full winding roll is then fed to the primary unwinding device and the web of material wound thereon is connected to the unwinding roll of material guided by the secondary unwinding device before this is completely settled. A gluing and separating device is provided for this.

From the EP 0 462 157-B1 a device is known which has a device for severing and holding the running web. The holding device for the running web is pivotably mounted in order to press it against an exchanged full winding roll, at the beginning of which an adhesive strip is attached. This creates a connection in which the end of the running out web overlaps with the beginning of the web of the new winding roll at the splice point.

This splicing process is usually carried out with the new winding roll rotating and is called flying splice.

In contrast to this, the DE 43 25 944 A1 as well as the EP 1163178 A1 a splice device with a holding device for holding the end of the outgoing web, which is fixedly arranged on one side of the outgoing web and has two holding elements which are arranged at a distance from one another in the direction of web travel. A web transport device is used to pick up the beginning of the web of a full winding roll on its circumference and to transport the beginning of the web to behind the area of the holding device. To cut through the web, a cutting knife is arranged in a groove of the holding device between the two holding elements. On the other side of the web there is a strip dispenser that can be moved up and down and with which an adhesive connecting strip can be moved against the webs. When a pressure piece moves against the holding element, the running web and the beginning of the new web are severed together. As a result, the new end of the web and the new start of the web are directly next to each other and can thus be connected to one another without any gaps.

Such a connection, referred to as a butt splice, without overlapping of the two webs has the advantage that the connection point does not have twice the web thickness and there is also no stepped shoulder (joint) at the splice point. A shock at the splice point can lead to malfunctions in downstream processing machines.

However, in the butt-splice process, the unwinding device and the downstream processing machine are usually shut down.

The object of the invention is to increase the possible uses with the least possible additional effort and high operational reliability.

According to the invention, the object with regard to the method was achieved in that the single secondary unwinding device is arranged between the primary unwinding device and the following machine unit and several, in particular two gluing and separating devices, optionally different splice methods for connecting the end of the expiring material web of the secondary -Enable unwinding device with the beginning of the web of the new winding roll of the primary unwinding device.

The use of only one secondary unwinding device reduces the effort considerably. In addition, because of its arrangement between the primary unwinding device and the following machine unit, this does not hinder the feeding of a new full winding roll to the primary unwinding device.

The position of the unwound material web is determined by the choice of the direction of rotation of the winding roll in the primary unwinding device.

This means that the connection of the web end of the secondary unwinding device with the web end of the full winding roll of the primary unwinding device should advantageously be possible independently of the current or intended direction of rotation of the primary unwinding device.

In addition, the different splicing processes allow adaptation to the special conditions of use.

It should therefore be possible to implement a splicing process with rotation of the new winding roll, in particular according to the flying splice principle, by means of at least one gluing and separating device. This enables the winding roll to be changed quickly and is particularly suitable for lightweight material webs.

In addition or as an alternative, it should be possible to implement a splicing process by means of at least one gluing and separating device when the new winding roll is at a standstill, in particular according to the butt-splice principle.

With regard to the unwinding station, it is essential that the single secondary unwinding device is arranged between the primary unwinding device and the following machine unit and that there are several, in particular two, holders for different gluing and separating devices.

The presence of several brackets for different gluing and separating devices means a little extra effort, but extends the application possibilities of the unwind station considerably.

In addition, this allows the unwind station to be put into operation with only one preferred gluing and separating device and, if necessary, one or more additional devices to be retrofitted.

In addition, if one gluing and separating device fails, another can be put into operation, which significantly reduces the downtime of the unwinding station.

In order to enable maintenance of the individual gluing and separating devices outside the machine, especially during operation, at least one, preferably all gluing and separating devices should be axially movable out of their holder and / or at least one, preferably all gluing and separating devices via Schnell -Closures can be released from their holder.

In the interest of a large number of possible uses, it is also advantageous if at least one holder carries a gluing and separating device to implement the flying splice principle and / or at least one holder carries a gluing and separating device to implement the butt splice principle.

As space problems can easily arise when several adhesive and separating devices are present, several adhesive and separating devices should be used Use at least one, preferably several, deflection rollers together for guiding the web.

The production of a connection between the material webs is also facilitated if the primary unwinding device is stationary and the secondary unwinding device is mounted displaceably for the purpose of taking over a winding roll towards the primary unwinding device.

In cases with a loss of web tension, in particular when the upper side of the material web is pointing downwards, it is advantageous if at least one web tensioning device is assigned to the material web after the primary unwinding device.

This web tensioning device should preferably be designed as a blower element, in particular as a blow box or blowpipe and / or as a tension roller.

Particular advantages result if the following machine unit is designed as a smoothing device or as a coating machine or, in particular, as a rotary cutting machine.

• Figur 1: einen schematischen Teilquerschnitt durch eine Abrollstation,
• Figur 2: die Abrollstation beim Rollenwechsel nach dem Butt-Splice-Prinzip und
• Figur 3: die Abrollstation beim Rollenwechsel nach dem Flying-Splice-Prinzip.

The invention will be explained in more detail below using an exemplary embodiment. In the attached drawing shows:

• Figure 1 : a schematic partial cross-section through an unwind station,
• Figure 2 : the unwind station when changing rolls according to the butt-splice principle and
• Figure 3 : the unwind station when changing rolls according to the flying splice principle.

The unwinding station described below can be used as a downstream machine unit 9, in particular in connection with a slitter-winder or the like.

In the unwinding station, webs of material 1 wound on reels to form winding rolls 7 are connected to one another, that is to say made endless, so that a continuous processing operation in one of the unwinding station - seen in the direction of travel of the material web 1 - downstream slitter reel is possible.

For this purpose, the unwinding station has a primary unwinding device 2 with a winding roller drive, only one secondary unwinding device 3 with a winding roller drive and two different gluing and separating devices 5, 6. The working position of the secondary unwinding device 3 is between the primary unwinding device 2 and the machine unit 9 following in the web running direction 8, i.e. the winder.

The unwinding begins in the primary unwinding device 2, to which the full winding roll 7 is fed. A winding roll 7, which can have a diameter of, for example, 3500 mm and more, is wound onto the spool.

The primary unwinding device 2 and the secondary unrolling device 3 are connected to one another via a guide device which comprises two running rails running parallel to one another and horizontally.

While the primary unwinding device 2 is stationary, the secondary unwinding device 3, together with its drive, can be displaced along the guide device from its working position to the primary unwinding device 2 and back again for the purpose of taking over the predominantly unwound winding roll 7.

The spools provided with bearing journals at their ends are each stored in a receiving fork of the secondary unwinding device 3.

Figures 2 and 3 show the unwinding station after the secondary unwinding station 3 has taken over the winding roll 7 and the primary unwinding station 2 has taken over a new, full winding roll 7 - Unrolling device 3 are transported.

The direction of rotation of the winding roll 7 in the primary 2 and thus also the secondary unwinding device 3 can be selected so that the top of the material web 1 points downwards or upwards when it is fed to the following machine unit 9. The upper side of the material web 1 always refers to the winding roll 7. The position of the material web 1 in the following machine unit 9 is particularly important if both sides have different material properties and the position of the side plays a role in further processing.

In contrast to known solutions, this is made possible here with only one secondary unwinding device 3, which considerably reduces the effort.

If the following machine unit 9 is, as shown in the figures, to the left of the secondary unwinding device 3, clockwise unwinding results in the top of the material web 1 pointing downwards when it reaches the following machine unit 9. When unwinding in a counterclockwise direction, the material web 1 points upwards.

The diameter of the winding roll 7 and thus the circumference of the unwinding are detected by a distance sensor.

If the unwinding and thus the diameter of the winding roll 7 of the secondary unwinding device 3 reach a predetermined value, the material web 1 coming from the secondary unwinding device 3 is connected to the material web 1 of the new, full winding roll via one of the gluing and separating devices 5, 6 7 of the primary unwinding device 2 connected and glued.

In addition, this gluing and separating device 5, 6 separates the material web 1 coming from the secondary unwinding device 3 in front of the connection point.

In order to wrap the overhanging paper flag after the unwinding end of the web has been severed, the drive of the secondary unwinding device 3 then briefly drives the winding roll 7 counter to the unwinding direction.

The gluing and separating devices 5, 6, which are known per se and responsible for connecting the web ends, are located below the primary unwinding device 2 and can be vertically adjustable for the purpose of adapting to changing diameters of full winding rolls 7.

The two gluing and separating devices 5, 6 can optionally be used to implement different splicing methods for connecting the end of the expiring material web 1 of the secondary unwinding device 3 to the beginning of the web of the new winding roll 7 of the primary unwinding device 2.

This shows Figure 2 the gluing and separating device 5 responsible for the butt-slice process, which is used in particular for heavy paper webs and connects the end of the outgoing material web 1 with the beginning of a new winding roll 7 seamlessly, i.e. without overlapping of the two material webs 1, when the winding roll is changed .

This (butt-splice) gluing and separating device 5 comprises according to Figures 1 and 2 as an essential component a stationary web holding device with two holding elements 13, 14 which are arranged in the web running direction 8 at a distance of approx. 50 mm from one another. Each holding element 13, 14 has a holding surface which extends parallel to the material web 1 and transversely over the maximum web width, with which the material web 1 can be held.

The two holding elements 13, 14 are preferably suction boxes which can be subjected to negative pressure and whose wall facing the material web 1 has suction openings as a holding surface in order to suck in the material web 1 and thus hold it.

In the area of the web holding device, on the other side of the material web 1, a separating and adhesive element 4 is arranged, which is mounted pivotably against the web holding device. The material web 1 can be separated by means of a circular knife and glued using an adhesive tape via a carriage of the adhesive and separating element 4 that can be moved transversely to the direction of travel 8 of the web.

A second adhesive tape application device is preferably arranged in the space between the two holding elements 13, 14, which on a transversely across the

Working width movably mounted carriage is attached. The end of the web can be glued to the beginning of a new winding roll on both sides, i.e. on both sides of the web.

Another element is not shown, which, in particular in the form of a suction tube, picks up the beginning of the web from the full winding roll 7 on its circumference and transports it to behind the region of the web holding device.

The butt-splice method essentially takes place when the full winding roll 7 is at a standstill and is possible regardless of the intended unwinding direction of the winding roll 7.

In contrast to this, in Figures 1 and 3 the gluing and separating device 6 responsible for the flying splice process is shown.

This (flying splice) gluing and separating device 6 of the unwinding station comprises a gluing carriage which holds the gluing roller.

A cutting device is also attached to the gluing carriage, which has a chopping knife which is preferably provided with serrations.

To connect the two web ends, as in Figure 3 indicated, an adhesive is applied to the full and rotating winding roll 7, the material web 1 of the secondary unwinding device 3 is pressed against the full winding roll 7 and the material web 1 is separated between the adhesive point and the secondary unwinding device 3.

Figure 3 shows the preferred unwinding with the top of the material web 1 pointing upwards. Since no additional web tension problems are to be expected here, the splicing process can take place at a rotation speed of the full winding roll 7 of the primary unwinding device 2 between 0.1 and 4 m / s.

As in Figure 1 shown, a holder 10 for receiving the gluing and separating device 5 for implementing the butt-splice principle and a second holder 11 for receiving the gluing and separating device 6 for implementing the flying splice principle.

The unwinding station according to the invention thus allows the selection of the splicing method that is most suitable for the machine and / or the material web 1.

In addition, commissioning with just one gluing and separating device 5, 6 and retrofitting can take place later.

In addition, if one gluing and separating device 5, 6 fails or is being serviced, the other can be used, which considerably reduces downtimes.

In order to facilitate maintenance and repair of a gluing and separating device 5, 6 and even to enable it during machine operation, at least essential elements of both gluing and separating devices 5, 6 can be moved axially out of their holder 10, 11.

To minimize the effort, both gluing and separating devices 5, 6 use several deflecting rollers 12 together for guiding the web.

In order to simplify the transfer of the already predominantly unwound winding roll 7 to the secondary unwinding device 3, the two winding roll drives are arranged on different sides of the machine. Specifically, the larger drive of the primary unwinding device 2 for the full winding roll 7 is located on the machine side and the smaller drive for the predominantly unwound winding roll 7 of the secondary unwinding device 3 is on the operator's side of the machine that is accessible to the operator.

It is essential that the drive of the secondary unwinding device 3 remains coupled to the winding roll 7 after the takeover until the end of unwinding, i.e. the unwinding station manages with two drives. In addition, the larger drive of the primary unwinding device 2 is fixed and only the smaller drive is displaceable, which simplifies the construction.

The web tension is regulated during the entire process, which counteracts winding errors.

Claims (12)

1. Method for unwinding a material web (1), in particular a paper or board web, for a subsequent machine unit (9) for processing the material web (1), having an unwinding station which comprises a primary unwinding device (2), at least one secondary unwinding device (3) and at least one gluing and separating device (5,6), wherein the wound roll (7) is first unwound in the primary unwinding device (2) and after its transfer is further unwound in a secondary unwinding device (3) and a new wound roll (7) is inserted into the primary unwinding device (2) and the gluing and separating device (5,6) connects the material web (1) of the secondary unwinding device (3) to the material web (1) of the new wound roll (7) during a roll change and cuts the material web (1) running from the secondary unwinding device (3) to the splicing point, the single secondary unwinding device (3) being arranged between the primary unwinding device (2) and the following machine unit (9), characterised in that a plurality of gluing and separating devices (5, 6) selectively enable different splicing methods for joining the end of the outgoing material web (1) of the secondary unwinding device (3) to the web start of the new wound roll (7) of the primary unwinding device (2).
2. Method according to claim 1, characterised in that by means of at least one gluing and separating device (6) a splicing method can be realised during rotation of the new wound roll (7), in particular according to the flying splice principle.
3. Method according to claim 1 or 2, characterised in that a splicing process can be realised by means of at least one gluing and separating device (5) when the ninth winding roll (7) is stationary, in particular according to the butt-splice principle.
4. Method according to one of the preceding claims, characterised in that the primary unwinding device (2) is driven in a direction of rotation corresponding to the position of the unwound material web (1) of the new wound reel (7).
5. Unwinding station for unwinding a material web (1), in particular a paper or board web, for a subsequent machine unit (9) for processing the material web (1), having a primary unwinding device (2), at least one secondary unwinding device (3) and at least one gluing and separating device (5, 6), in particular for carrying out the method according to one of the preceding claims, the single secondary unwinding device (3) being arranged between the primary unwinding device (2) and the following machine unit (9), characterized in that a plurality of holders (10, 11) for different gluing and separating devices (5, 6) are present.
6. Unwinding station according to claim 5, characterised in that at least one holder (11) carries a gluing and separating device (6) for implementing the flying splice principle.
7. Unwinding station according to claim 5 or 6, characterised in that at least one holder (10) carries a gluing and separating device (5) for implementing the butt-splice principle.
8. Unwinding station according to one of the claims 5 to 7, characterised in that at least one, preferably all, gluing and separating devices (5, 6) can be moved axially out of their holder (10, 11).
9. Unwinding station according to one of the claims 5 to 7, characterised in that at least one, preferably all, of the gluing and separating devices (5, 6) can be released from their holder (10, 11) via quick-release fasteners.
10. Unwinding station according to one of the claims 5 to 9, characterised in that several gluing and separating devices (5, 6) jointly use at least one deflecting roller (12) for guiding the web.
11. Unwinding station according to one of the claims 5 to 10, characterised in that the primary unwinding device (2) is fixed and the secondary unwinding device (3) is displaceably mounted towards the primary unwinding device (2) for the purpose of taking over a winding roll (7).
12. Unwinding station according to one of the preceding claims, characterised in that the machine unit (9) following in the web running direction (8) is designed as a smoothing device or as a spreading machine or in particular as a roll cutting machine.

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