Apparatus and Method for Changing a Reel and Connecting a New Material Web to an End of an Old Material Web

Abstract

The invention relates to a device for changing a reel and for connecting a new material web to the end of an old material web, with a first reel (101) from which the first material web thereof which is wound thereon can be unwound, a transport device (103), particularly a transport roller, by means of which the first material web can be guided in a guiding region at a transport speed, a second reel (121) with which the new material web can be prepared, a drive device for rotatably driving the second reel, a separating device (142) for cutting through the first material web, by means of which the material web can be cut through in the guiding region or upstream of the guiding region in order to produce a trailing end, and a control and/or regulating device for the mutual adjustment of the trailing end and the beginning (125) of the second material web, such that the trailing end and the beginning of the web are at a distance of more than 0 mm from each other and particularly do not overlap. The trailing end and the beginning of the new material web can be connected to each other in the guiding region of the transport device by means of a connection element, and the transport speed of the trailing end and the beginning of the web corresponds to more than 0 meter per minute in the guiding region.

Claims

1. An apparatus and method for changing a roll and connecting a new material web to an end of an old material web with A first roll, whose wound-up, first material web can be unwound, A conveying device, in particular a conveying roller, over which the first material web may be guided in a guiding area at a conveying speed; a second roll, with which the new material web may be supplied; a drive device for rotationally driving the second roll; A severing device for severing the first material web, with which the material web may be severed in order to create a trailing end in the guiding area or upstream of the guiding area; a control and/or regulating device for mutual adjustment of the trailing end and the web start of the second material web, such that the trailing end and the web start are at a distance greater than 0 mm from one another and, in particular, are free of overlap, whereby the trailing end and the web start of the new material web in the guiding area of the conveying device may be connected to one another with a connecting element, and whereby the conveying speed of the trailing end and the web start in the guiding area exceeds 0 meters per minute.

2. An apparatus according to claim 1, wherein the trailing end and the web start are at a distance of less than 30 mm, in particular less than 20 mm, and preferably less than 10 mm from one another.

3. An apparatus according to claim 1, wherein the adjustment and/or connection take place at a conveying speed exceeding 0 meters per minute (m/min), preferably more than 50 m/min, in particular more than 100 m/min.

4. An apparatus according to claim 1, wherein it is designed as buffer-free.

5. An apparatus according to claim 1, wherein a conveying roller is provided as a conveying device.

6. An apparatus according to claim 1, wherein the separator is arranged within the conveying device and can be extracted for separation from the surface upon which the material web rests, whereby a separating cut takes place.

7. An apparatus according to claim 1, wherein a braking device is provided with which the first roll can be slowed down.

8. A method for changing a roll and connecting a new material web to an end of an old material web, whereby a wound-on, first material web is unwound from a first roll, the first material web is guided via a conveying device, in particular a conveying roller, in a guiding area at a conveying speed, the new material web is supplied from a second roll, the second roll is rotationally driven by a drive device, the first material web is severed by a separator in order to create a trailing end in the guiding area or upstream of the guiding area. the trailing end and a web start of the second material web are adjusted via a control and/or regulating device, such that the trailing end and the web start are at a distance greater than 0 mm from one another and, in particular, free of overlap, the trailing end and the web start of the new material web in the guiding area of the conveying device may be connected to one another with a connecting element, and the conveying speed of the trailing end and the web start in the guiding area exceeds 0 meters per minute.

9. The apparatus according to claim 5, wherein the conveying roller is a contact roller.

Description

[0037] Further advantages, features and details of the invention will become apparent from the following description, which explains various exemplary embodiments in detail with reference to the figures. The features mentioned in the claims and the description may be essential to the invention individually or in any combination. In the context of the entire disclosure, features and details described in connection with the method according to the invention naturally also apply to the unwinding apparatus according to the invention and vice versa, such that mutual reference is always made or can be made to the individual aspects of the invention with respect to the disclosure. The individual figures show:

[0038] FIG. 1 A schematic diagram of an unwinding apparatus according to the invention in the unwinding phase

[0039] FIG. 2 A schematic diagram of an unwinding apparatus according to the invention with a first roll shifted to the change position

[0040] FIG. 3 A schematic diagram of an unwinding apparatus according to the invention with a first roll shifted to the change position

[0041] FIG. 4 A schematic diagram of an unwinding apparatus according to the invention with a second roll prepared for a roll change

[0042] FIG. 5 A schematic diagram of an unwinding apparatus according to the invention with an accelerated second roll

[0043] FIG. 6 A schematic diagram of an unwinding apparatus according to the invention, whereby the web end of the first roll and the web start of the second roll reach the contact point.

[0044] FIG. 7 A schematic diagram of an unwinding apparatus according to the invention, whereby the first winding is conveyed away.

[0045] FIG. 1 is a schematic diagram of an unwinding apparatus 100 according to the invention during the unwinding phase, in which a roll 101 is initially situated in the unwinding apparatus 100. The material web 102 is pulled off from the roll 101 and passes over a contact roller 103, against which preferably the winding 101 is positioned. For this purpose, the winding 101 may be rotatably mounted on slides, not shown, whereby the slides may slide on rails relative to the contact roller 103. The rails are connected to pivoting arms 104 that are pivotable about the axis of rotation 105 of the contact roller 103, such that the roll 101 may assume different angular positions for the contact roller 103. During the normal unwinding process shown, the roll 101 rotates in the direction of the arrow 111 and the contact roller 103 in the direction of the arrow 113, i.e., they rotate in opposite directions. The conveying direction of the material web 102 is indicated by the arrow 112.

[0046] FIG. 2 now shows the situation, in which the roll 101 was unwound to a small roll size, whereby only so much material web is on the roll, such that only a small amount is available at the end of the change process as a safety stock. In the situation shown, the swivel arms 104 were pivoted against the direction of rotation of the contact roller 103 in the direction of the arrow 201, such that the roll 101 can be transferred to the support arms 202. In this position, which may be designated the second reel position, the roll is still being unwound.

[0047] FIG. 3 now shows that the rolls remains in the second unwinding position. The swivel arms 104 are now being pivoted back. The position, which the swivel arms assume after pivoting back, may be the unwinding position, as shown in FIG. 1, or also, as shown, a receiving position for receiving a new roll 121. This position is preferably lowered relative to the unwinding position according to FIG. 1 in order not having to lift the roll with a crane or forklift.

[0048] FIG. 4 now shows the situation according to FIG. 3, but with the swivel arms 104 pivoted back into the unwinding position. FIG. 4 shows yet another advantageous detail. The new roll 121 is prepared for a roll change in such a way that a double-sided adhesive tape 122 is glued on in the area of transition from the first material web layer to the second material web layer of the roll 121 in the transverse direction with its lower surface 124. The web start 125 with its rear side is glued onto a partial surface of the upper surface 123 of the adhesive tape 122. The part of the upper surface 123 of the adhesive tape 122 not covered by the web start 125 initially remains exposed.

[0049] FIG. 5 now shows that the second roll has been set in rotation. This is indicated by the arrow 131. During the acceleration phase, the second winding 121 was synchronized with the contact roller 103 with respect to the peripheral speed and the angular position, whereby the web start 125 impacts the contact roller 103 at or shortly after the position 141 of the separating knife 142 of the contact roller 103. Shortly after preferably means an area greater than 0 millimeters (mm) and up to 30 mm, in particular up to 20 mm, and preferably up to 10 mm FIG. 5 also shows that having passed the roll 101, the separating knife was moved out of the peripheral surface of the contact roller in order to sever the material web 102. Immediately after applying the separating cut, the separating knife 142 is retracted again so as not to damage the roll 121. Before the web end of the material web 102 created now by the separating cut passes the contact point between the contact roller 103 and the roll 121, the roll 121 was already moved up to the contact roller 103 by the above-described slide rail system in order to make contact therewith.

[0050] FIG. 6 shows the web start of the new roll 121 reaching the contact line almost simultaneously with the web end of the material web 102, whereby the exposed area of the adhesive tape 122 is placed on the web end, such that the end of the material web 102 is connected with the web start of the new roll. The double-sided adhesive tape 122 has an upper surface 123 with greater adhesion with respect to the material of the material webs than the adhesion of the lower surface 124 of the adhesive tape. Thus, it can be ensured that upon connection of the two material webs, the adhesive tape also separates from the transition between the first and second material layers of the reel 121. In order to make the described process even safer, devices, which act on the web end and/or the web start with an additional force in the direction of the surface of the contact roller, may be provided. Preferably, for this purpose, holes to which vacuum may be applied, e.g., suction holes, may be provided in the surface of the contact roller. Such openings are not shown in FIG. 6.

[0051] Before the web end 143 of the first roll 101 created by the severing knife 142 could reach the contact line between the second roll 121 and the contact roller 103, the first roll 101 is slowed down by a braking device, not shown, such that the web end 143 is not in the area of the contact line

[0052] Finally, FIG. 7 shows that the connection point, which is visible due to the adhesive tape 122, is conveyed further by the still continuing rotation of the contact roller 103, while the first roll 101 is removed from the contact roller along the support arms 202 and passed to a removal position. From there, the first roll 101 can be removed from the winding device 100. Thus, the condition in accordance with FIG. 1 has been restored, whereby the second roll 121 is now the first roll 101 for the ensuing change process.

[0053] Various elements of the apparatus according to the invention are depicted several times in the individual figures. For the sake of clarity, the same elements have been provided with reference numerals only in one or a few figures. However, the reference numerals also apply with respect to figures in which they have not been entered.

TABLE-US-00001 Reference numeral list 100 Unwinding apparatus 101 Roll 102 Material web 103 Contact roller 104 Swivel arms 105 Axis of rotation 111 Arrow 112 Arrow 113 Arrow 121 New roll 122 Double-sided adhesive tape 123 Upper surface of the adhesive tape 122 124 Lower surface of the adhesive tape 122 125 Web start 131 Arrow I 141 Position of separating knife 142 142 Separating knife 143 Web end 201 Arrow 202 Support arms