EP1140679B1 - Method and device for connecting material strips - Google Patents

Abstract

A method and apparatus for connecting a trailing end of a cardboard or paper web running off an unwinding roll with a leading end of a new wound roll. A splice beam engages a trailing end of an unwinding roll and severs the trailing end from the residue on the unwound roll while applying a first adhesive strip thereto. The splice beam then presses that trailing end against the leading end of a new roll which has previously been provided with a second adhesive strip so that the trailing end is bonded by the splice beam to the leading end with the two adhesive strips thereby leaving little or no unbonded web at the connection.

Description

Technical field

The invention relates to a method and a device for connecting the end an outgoing material web with the start of a new winding roll at the Unwinding material webs, especially paper or cardboard webs, from one Winding roll.

State of the art

In unwinding devices for winding rolls made of material webs, for example paper or Cardboard webs, splice devices are known which are the end of the leaking Connect the material web to the start of the web of a new winding roll. At the Unwinding heavy paper rolls on continuous metal axes (reels) are wound up and with a web width of 8 m and more a weight of over 50 t the subsequent processing machine is usually used for splicing stopped.

EP 0 462 157-B1 describes a method and a device of the generic type Type known, in which (the) first the outgoing web separated from the remaining roll and the end of the separated outgoing web is held while the remaining roll is exchanged for a new winding roll. At the beginning of the web The new winding roll has an adhesive strip against which the end of the running out Web is pressed to attach it to the new roll.

In the known methods and devices, the problem arises that it especially with very large and heavy winding rolls and large web widths is not possible to secure a rail connection with a short protruding one to produce a free web end. One reason for this is that it is not is possible, the adhesive strip on the web start of the new winding roll exactly to be aligned aligned axially. Secondly, it is not possible to use the new one To position the winding roll circumferentially so precisely that the holding device with the End of the web is moved precisely against the adhesive strip. The inaccuracies in Attach the adhesive strip and / or when positioning the new winding roll. result in the end of the web not ending exactly with the adhesive strip, but rather one free, not glued-on remainder of the web survives when processing the Winding rolls, for example in a printing or cross cutting machine, malfunctions can cause.

WO 93/25460-A describes a method for connecting material webs known that is carried out without interrupting the path movement. To the after making a first adhesive connection protruding web rest of the Gluing the running web to the beginning of the new web is done from the outside a second adhesive tape is attached, which is in width across the end of the outgoing web up to the area of the no longer covered web start extends.

Presentation of the invention

The invention has for its object a method and an apparatus Generic type to improve so that a connection without or with only minimal protruding, not glued web remnants can be produced.

This object is achieved with the features of claim 1 and claim 5 solved.

According to the invention, the end of the outgoing web is at the beginning of the web connected by means of two adhesive strips extending across the width of the web. In front The first adhesive strip can be spliced exactly at the beginning of the new winding roll can be attached, the second adhesive strip can be exactly along the end of the outgoing web to be attached to this. When connecting the tracks is like this both the end of the outgoing web at the new beginning of the web, and the new web start glued to the end of the web. Because the two adhesive strips can be positioned exactly, there is neither a protruding free one The beginning of the new path still has a protruding free end of the one that is about to expire Train.

The second adhesive strip attached to the web end in the web running direction is preferred pressed against the new winding roll behind the adhesive strip at the beginning of the web, in order to keep the thickness of the splice as small as possible, as in claim 2 is claimed.

The subclaims contain preferred, since particularly advantageous, configurations the invention.

Brief description of the drawing

The drawing serves to explain the invention with reference to a simplified illustrated embodiment.

Show it:

Figures 1 to 4

in side view the structure and operation of a device for Connecting material webs,

Figures 5 and 6

in an enlarged view the splice element and its mode of operation, and

Figure 7

the junction of the two railways.

Ways of Carrying Out the Invention

The embodiment of the invention shown in Figures 1 to 4 is part of a unwinder for heavy paper rolls 1, which is referred to as a drum, continuous metal axes 2 are wound and with a web width of 8 m and more can have a weight of over 50 t. In Figure 1 is the side view the unwinding device shown during unwinding.

The winding roll 1 is with its reel 2 in an unwinding frame with two lateral Stand 3 suspended. A side brake generator that both the winding roll 1 in can brake regenerative operation as well as drive in motor operation, is not shown in the simplified drawings. The paper web 4 is from above withdrawn and deflected by a guide roller 5 to a subsequent roll cutting and winding machine, where they are longitudinally divided and cut into individual webs smaller winding rolls is wound up.

The inventive device for connecting webs contains two lateral Swivel lever 6, each outside the area of the web 4 by means of a piston-cylinder unit 7 about a pivot axis 8 running below the guide roller 5 are pivotally mounted. At the free end of each pivot lever 6 is one on the Working width extending splice element attached to a web holding device contains. In the present example, the splice element is an internally hollow splice beam 9, which is shown enlarged in Figures 5 and 6. The splice bar 9 is over an axis 10 running parallel to its longitudinal direction by means of a piston-cylinder unit 11 pivotally mounted on the pivot levers 6 so that its the Winding roll 1 facing front wall 12 are aligned parallel to the web 4 can. The front wall 12 contains a series of suction channels 13, the outer Openings form a suction zone with which the end of the running web 14 - as in FIG Figure 3 shown - after cutting the web 4 can be held. to Generation of the vacuum holding the web 14 is on the inside of the beam 9 a suction fan connected.

The pivot lever 6 with the splice beam 9 attached to it are constructed and that the splice bar 9 from the run of the web 4 shown in Figure 1 non-disturbing rest position in the web 4 running from a residual roll 17 can be pivoted, as shown in Figure 2. At the same time, the Splice bar 9 with its front wall 12 against a newly inserted full winding roll 1 move. This position is shown in Figure 4.

The device also includes a separator 16 for severing the web 4 and a device 15 for applying an over the entire web width extending adhesive strip 18 along the created when cutting Web end of the outgoing web 14, which are only shown in Figures 1 and 2. The web cutting device 16 is arranged so that the from the front wall 12 of the Splice bar 9 sucked web 4 transversely along the rear in the web running direction Edge of the front wall 12 is severed. Preference is given to the separating device 16 uses a circular knife that can be moved across the working width Splice bar 9 is mounted. The device 15 for applying an adhesive strip 18 on the end of the running web 14 preferably consists of a traversable Adhesive tape dispenser, which is also movably mounted on the splice beam 9 Adhesive tape application device 15 is arranged relative to the web cutting device 16 in such a way that the adhesive strip 18 - as shown in Figure 5 - immediately along the End of the outgoing web 14 is applied, so that no or only a minimal small remaining free web residue arises.

Figure 1 shows the splicing device in its rest position, while the web 4 of the Winding roll 1 is unwound. The splice beam that extends across the width of the web 9 is pivoted up into a rest position which does not disturb the course of the web 4.

Is the winding roll 1 except for a remaining roll 17 of at least 3 to 4 layers of paper unwinding, the unwinding process is slowed down. When web 4 is stopped the splice beam 9 moves against the taut web 4, its front wall 12 is also aligned parallel to the path 4 so that the suction zone is formed Front surface flat. With the suction fan, a vacuum in the Splice bar 9 generated so that the web 4 adheres to the front wall 12 (Figure 2). An adhesive strip 18 is then applied to the web 4 by the adhesive tape dispenser 15 applied and this in the web running direction immediately behind the applied Adhesive strips 18 are severed by the separating device 16. The end of the severed running web 14 is held by the splice bar 9, the adhesive strip 18 runs directly along the end of the running web 14, as in FIG. 5 is shown. Its distance from the end of the web is less than 10 mm, preferably less than 5 mm.

Then the splice beam 9 with the end held by it running web 14 pivoted up, and the remaining roll 17 is in the unwinder exchanged for a new full winding roll 1. The new full winding roll 1 is prepared in such a way that an adhesive strip 20 is attached to the outside at the start of its path 19 is (Figure 3). The adhesive strip 20, preferably also double-sided adhesive tape, was attached to the outside at the beginning of the web 19 that no or only a small remnant remains. The new winding roll 1 is in the unwinder positioned so that during the subsequent movement of the splice beam 9 against the new winding roll 1, the web end of the running web 14 with the Beginning of path 19 of the new winding roll 1 moved towards one another in a somewhat overlapping manner be (Figures 4 to 6). The overlap of the two webs 18, 19 is less than 200 mm, preferably about 100 mm. The adhesive strip 18 is traversing web end so moved against the web start 19 that it with little Glue the space behind the adhesive strip 20 at the beginning of the web 19. The result is in Figure 7 shown rail connection, in which both the web end by means of Adhesive strip 18 is glued to the beginning of the web 19, as well as the beginning of the web 19 by means of the adhesive strip 20 at the end of the web 14. Free, non-glued are thus Web residues avoided, which in the subsequent processing machine to malfunctions could lead.

Claims (7)

1. Method of joining the end of an outgoing material web (14) to the web start (19) of a new wound reel (1) during the unwinding of material webs (4), in particular paper or board webs, from a wound reel (1), in which with the web (4) stationary

   the outgoing web (14) is severed from the remaining reel (17),

   the end of the severed outgoing web (14) is held by a splice element (9) while the remaining reel (17) is replaced by a new full wound reel (1), to whose web start '(19) an adhesive strip (20) is applied, and

   the end of the outgoing web (14) is then pressed against the adhesive strip (20) at the web start (19) in order to produce an adhesive joint,

   characterized in that before the adhesive joint at the end of the outgoing web (14) is produced, a second adhesive strip (18) is applied, which produces a second adhesive joint when the end of the outgoing web (14) is pressed against the web start (19).
2. Method according to Claim 1, characterized in that during the joining of the webs, the second adhesive strip (18) is pressed against the web start (19) of the new wound reel (1), behind the first adhesive strip (20) in the web running direction.
3. Method according to Claim 1 or 2, characterized in that the second adhesive strip (18) is applied to the end of the outgoing web (14) as the latter is cut off.
4. Method according to one of Claims 1 to 3, characterized in that the second adhesive strip (18) is applied to the outgoing web (14) at a distance of less than 10 mm, preferably less than 5 mm, from the end of the outgoing web (14).
5. Device for joining the end of an outgoing material web (14) to the web start (19) of a new wound reel (1) during the unwinding of material webs (4), in particular paper or board webs,
   having a device for replacing the remaining reel (17) by a new wound reel (1), to whose web start an adhesive strip (20) is applied, having a device (16) for severing the stationary web (4) and a splice element (9) which can be placed on the web (4) and can be moved outside the range of a full wound reel (1) to hold the end of the stationary outgoing web (14), it being possible for the said splice element (9) to be pressed against the outer circumference of a full wound reel (1) in order to produce a first adhesive joint, characterized by a device (15) for applying a second adhesive strip (18) to the end of the outgoing web (14) that is created when the web (4) is severed as a result of which, when the end of the outgoing web (14) is pressed against the web start (19) of a full wound reel (1) by the splice element (9), two adhesive joints are created.
6. Device according to Claim 5, characterized in that the web severing device (16) and the device for applying the adhesive strip (18) are mounted on the splice element (9).
7. Device according to Claim 5 or 6, characterized in that the splice element comprises a suction bar (9) which extends over the working width, which is fixed such that it can pivot on pivoting levers (6), whose interior is connected to a suction blower and whose front wall (12) has a row of suction ducts (13) for holding the end of the outgoing web (14).

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