Method in the threading of a paper web or of an equivalent web-like material in a winding device in particular in a slitter-winder and device for carrying out the method

Abstract: The invention concerns a method in the threading of a paper web or of an equivalent web-like material in a winding device, in particular in a slitter-winder, in which winding device the paper web (W) or the equivalent web-like material is wound from a web reel (2) or equivalent onto another roll. In the method a threading wedge is formed into the paper web (W) or equivalent web-like material, which threading wedge is passed through the winding device. In the method, substantially at the same time, the web reel (2) is unwound, a threading wedge narrower than the width of the web (W) is separated from the web (W) by means of a wedge-making device/devices (4), and the web (W) is passed by means of threading devices through the winding device. Further, the invention also concerns a device for carrying out the method in the threading of a paper web or of an equivalent web-like material in a winding device, in particular in a slitter-winder. The winding device comprises members for winding the paper web (W) or the equivalent web-like material from the web reel (2) or equivalent onto another roll. The device comprises a pulling device (1) or equivalent for unwinding the web (W) from the web reel, a wedge-making device/devices (4) for cutting the threading wedge (W') substantially at the same time from the web (W), and threading devices for passing the threading wedge through the winding device substantially at the same time.

Description: The invention concerns a method in the threading of a paper web or of an equivalent web-like material in a winding device, in particular in a slitter-winder, in which winding device the paper web or the equivalent web-like material is wound from a web reel or equivalent onto another roll, in which method a threading wedge is formed into the paper web or equivalent web-like material, which threading wedge is passed through the winding device. Further, the invention also concerns a device for carrying out the method in the threading of a paper web or of an equivalent web-like material in a winding device, in particular in a slitter-winder, which winding device comprises members for winding the paper web or the equivalent web-like material from the web reel or equivalent onto another roll. In the way known from the prior art, the threading of the leader end of a paper web or of an equivalent web-like material in a winding device, for example in a slitter-winder, is started by shaping the end of the web into wedge shape on the reel face manually, for example by tearing or cutting. The end of the wedge is guided manually to the threading devices, which carry the web end through the winding device. It is one of the drawbacks of this prior-art method that the threading process usually requires at least two operators, of whom one prepares the threading wedge to the web and guides the web to the threading devices, and the other one controls the winding device. In practice, the threading is almost always carried out by three operators, of whom two prepare the threading wedge and the third controls the winding device. Thus, the threading process takes an abundance of working time and, thus, causes expenses. Threading is also slow, because preparation of the wedge on the reel face takes time, which reduces the capacity of the winding device, because during this time the winding device cannot be used for production running proper. A threading wedge that has been made manually is often also of low strength and can cause problems during the threading. A further problem is involved in locating the hand-made threading wedge in the correct location and as of correct width. With respect to the prior art, reference can be made, e.g., to the FI Patent No. 69,439, in whose solution the end of the web is passed from the machine reel or equivalent through the winding device along a path determined by the members that guide the web. The web end is passed from the machine reel through the winding device as of full width so that the end of the web placed on the machine reel is grasped and the web is wound the desired number of windings around the pick-up and grasping device that is used, after which the web is passed as two-fold through the winding device so that the web is unwound at the same time both from the machine reel and from the pick-up and grasping device that is used. In this prior-art solution, the arrangement that is used for threading the two-fold web end of full width is quite complicated and expensive to carry out. The object of the present invention is to provide a solution for the problems described above. One object of the invention is to provide a procedure in which no additional operator capacity is required during threading at the winding device. It is a further object of the invention to provide automatic preparation of the threading wedge, in which case the locating of the threading wedge is correct also in respect of the width and in respect of the wedge formation point in relation to the threading devices. In view of achieving the objectives stated above and those that will come out later, the method in accordance with the invention is mainly characterized in that, in the method, substantially at the same time, the web reel is unwound, a threading wedge narrower than the width of the web is separated from the web by means of a wedge-making device/devices, and the web is passed by means of threading devices through the winding device. On the other hand, the device in accordance with the invention for carrying out the method is mainly characterized in that the device comprises a pulling device or equivalent for unwinding the web from the web reel, a wedge-making device/devices for cutting the threading wedge substantially at the same time from the web, and threading devices for passing the threading wedge through the winding device substantially at the same time. According to the invention, the end of the paper web is pulled from the machine reel substantially as of full width by means of a pulling device, and, at the same time, a strip narrower than the web width, i.e. a threading wedge, is cut out of the web. Further, at the same time with the making of the wedge, the end of the web is passed through the winding equipment, for example a slitter-winder. The threading wedge is separated so that, when it is cut, it can be guided away from the web plane. The threading wedge is guided through the winding device during its cutting, and after the threading wedge has proceeded some distance, its width is increased by displacing the cutting device/devices towards the edges of the web so that the wedge has finally reached the width of the web. In accordance with the present invention, a quicker threading is achieved, compared with the prior-art solutions, because the threading wedge can already be guided through the winding device, such as a slitter-winder, while it is being cut. Further, by means of the equipment based on the threading method in accordance with the present invention, the threading can be carried out so that at said machine just one operator is needed, who controls both the threading devices and the winding device at the same time. Further, the threading wedge that is produced in the system in accordance with the invention is cut mechanically, in which case it is of high strength and, thus, does not cause problems in the threading equally easily as in the prior-art solutions, in which the wedge has been torn manually, in which case it can be torn off readily. Further, when a wedge is made automatically by means of a cutting device, locating of the wedge at the correct location in relation to the threading devices and making the width of the wedge correct can be accomplished simply and readily, in which case the threading equipment operates adequately. The threading of the web in accordance with the invention is favourably suitable for use in connection with unwind stands, for example with a slitter-winder, in particular with a drum winder or a carrier-belt slitter-winder, but it is also suitable for use in connection with slitter-winders and winders of other types. In the following, the invention will be described in more detail with reference to the figures in the accompanying drawing, the invention being, however, not supposed to be strictly confined to the details of said illustrations. Figure 1 is a schematic illustration of an exemplifying embodiment of the invention. Figure 2 is a schematic illustration of an exemplifying embodiment of the invention. Figure 3 is a schematic illustration of another exemplifying embodiment of the invention. Figure 4 is a schematic illustration of a grasping device used in the exemplifying embodiment illustrated in Fig. 3. Figure 5 is a schematic illustration of a further exemplifying embodiment of the invention. Figure 6 is a schematic illustration of a further embodiment of the invention. In the exemplifying embodiments of the invention that will be described in the following, corresponding parts are denoted with the same reference numerals. As is shown in Fig. 1, from the machine reel 2, which revolves in the sense indicated by the arrow S, the end of the paper web W is pulled as of full width by means of a pulling device 1, and at the same time, out of the web W, by means of the blades 5 of a wedge making device, a strip W' narrower than the web width, i.e. a threading wedge, is cut, which is separated so that, when it is cut, it can be guided away from the plane of the web W, which is indicated by the arrow S 1 . The wedge W' is guided through the winding device while the wedge is being cut, and after the wedge W' has proceeded a certain distance, its width is increased by displacing the cutting device/devices 5 towards the edges of the web W so that the wedge W' has finally reached the width of the web W. By means of the cross-cut blade 6 the web W is cut off between the cut lines C. In the embodiment shown in Fig. 2, the end of the web W is picked up by means of a mobile suction roll 1 as of full width from the face of the machine reel 2 revolving in the sense indicated by the arrow S. The suction roll 1 is run from the position of the suction roll 1' indicated by the dashed line to the station for cutting of the threading wedge W', and the wedge making device 4 is run from the position of the wedge making device 4' indicated by the dashed lines towards the web W while the suction roll 1 revolves constantly. The web W runs while guided by the guide rolls 3. The wedge making device 4 comprises two blades 5, which cut two longitudinal cuts C (FIG. 1) into the web W, and a separate cross-direction blade 6, which cuts off the web W between the cut lines C (FIG. 1) and guides the threading wedge W' away from the plane of the web W. While the suction roll 1 revolves constantly, the threading wedge W' is guided by means of guide plates 7 onto the first line of rolls 8 in the slitter-blade board, after which the threading wedge W' is guided through the slitter blades 11 of the slitter-winder. After the second row of blades 12 in the slitter-blade board, the threading wedge W' is passed, being guided by the guide plate 10, onto the spreader rolls 14. The end of the wedge W' is passed by means of the guide plate 13 over the spreader rolls 14 onto the carrier drums 16,17. The wedge W' is carried on the face of the rear carrier drum 17 while the drum revolves, by means of the suction present in the carrier drum 17. From the face of the rear carrier drum 17, the wedge W' is separated by means of blowing 18, which, at the same time, guides the wedge over the forward carrier drum 16. The end of the wedge W' is guided from the forward carrier drum 16 through the gap 20 directly into the pulper. The wedge W' is run directly into the pulper until the wedge has come through as of full width. The wedge W is cut off, new spools are inserted, and the winding is started. In the exemplifying embodiment shown in Figs. 3 and 4, the end of the web W is picked up as of full width by means of the displaceable suction roll 1 from the face of the reel 2 which revolves in the sense indicated by the arrow S. The suction roll 1 is run from the position of the suction roll 1' indicated by the dashed line to the wedge cutting station, and the wedge making device 4 is run from the rest position of the wedge making device 4', indicated by the dashed lines, towards the web W while the suction roll 1 revolves constantly and while the guide rolls 3 support the web W. By means of the grasping device 25, Fig. 4, which runs at the edge of the slitter-winder through the whole slitter-winder, the edge of the web W is grasped before the wedge making device 4. In the wedge making device 4 there is one cutter blade 5, which runs from one edge to the other. The web W is cut before the grasping device 25, in which connection a strip, i.e. the threading wedge W', is separated at the edge of the web W. The grasping device 25 passes the threading wedge W' through the slitter-winder at the same time as the suction roll 1 revolves. After the end of the wedge has proceeded a certain distance, the threading wedge W' is widened to the web W width by displacing the cutter blade 5. The grasping device 25 passes the end of the wedge through the slitter-winder, and the wedge W' is run onto the carrier drums 17 and 16 in compliance with the preceding exemplifying embodiment, and further through the gap 20 into the pulper until the web W has come through the whole slitter-winder as of full width. The web W is cut off and the spools are inserted, after which the winding is started. In the exemplifying embodiment of the invention shown in Fig. 5, the web W is pulled from the machine reel 2, which revolves in the sense indicated by the arrow S, as of substantially full width into the pulper 21, which pulper operates, in this exemplifying embodiment of the invention, as the web pulling device. By means of the wedge making device 4, a threading wedge is formed into the web W, which wedge is guided over the guide plate 22 between the guide rolls 3 and the guide plate 9, guided by the guide plate 7, over the cutter-blade board 8,11,12, further supported by the guide plates 10, onto the spreader rolls 14, from which the web W is guided onto the carrier drums 17,16 by means of the guide plate 13 and, similarly, by means of the blowing 18, as was the case in the preceding exemplifying embodiments. The web W is cut off, and new winding is started. In the exemplifying embodiment shown in Fig. 6, the threading wedge is cut by means of the wedge making device 4 on the face of the machine reel 2 revolving in the sense indicated by the arrow S, and the tip of the wedge is picked up from the face of the machine reel 2 revolving in the sense indicated by the arrow S and guided onto the guide plate 15 and from there further to between the guide rolls 3 and the guide plate 9. In this exemplifying embodiment of the invention, the web W is pulled by the tip of the threading wedge, and in this exemplifying embodiment of the invention the machine reel 2 operates as the device that pulls the web W of full width at the wedge making device 4. As is the case in the other exemplifying embodiments described above, simultaneously with the formation of the wedge the web W is guided through the slitter-winder. Above, the invention has been described with reference to some preferred exemplifying embodiments of same only, the invention being by no means supposed to be strictly confined to the details of said embodiments. The method and the equipment in accordance with the invention are also suitable for other types of slitter-winders besides those described in the preceding exemplifying embodiments and also for winding devices of other types besides those described above.

Claims: A method in the threading of a paper web or of an equivalent web-like material in a winding device, in particular in a slitter-winder, in which winding device the paper web (W) or the equivalent web-like material is wound from a web reel (2) or equivalent onto another roll, in which method a threading wedge (W') is formed into the paper web (W) or equivalent web-like material, which threading wedge is passed through the winding device, characterized in that , in the method, substantially at the same time, the web reel (2) is unwound, a threading wedge (W') narrower than the width of the web (W) is separated from the web (W) by means of a wedge-making device/devices (4), and the web (W) is passed by means of threading devices through the winding device. A method as claimed in claim 1, characterized in that , in the method, the threading wedge (W') is guided away from the plane (S 1 ) of the web (W), and the threading wedge (W') is guided to the threading devices, and that the width of the threading wedge (W') is increased by displacing the wedge making device/devices (4) so that the threading wedge (W') reaches the width of the web. A method as claimed in claim 1 or 2, characterized in that , in the method, the end of the web (W) is picked up from the face of the web reel (2) by means of a moving suction roll (1), and that the suction roll (1) is run into the station for cutting of the threading wedge (W'), and the wedge making devices (4) are run towards the web while the suction roll (1) revolves constantly. A method as claimed in any of the claims 1 to 3, characterized in that , by means of the wedge making device/devices (4), two cut lines are formed into the web (W), between which the threading wedge (W') is formed, and the threading wedge (W') is cut off in the cross direction between the cut lines (6) in the initial stage of the cutting. A method as claimed in any of the claims 1 to 4, characterized in that , after the threading wedge (W') has proceeded a certain distance through the winding device, the threading wedge (W') is spread to full width of the web (W) by displacing the cutting devices. A method as claimed in any of the claims 1 to 5, characterized in that the threading wedge (W'), which was guided away from the plane of the web (W), is guided in the slitter-winder by means of the guides (7) in the slitter-winder through the slitting blades (11), after which the threading wedge (W') is pulled and carried by means of a guide (10) towards the spreader rolls (14), from which the threading wedge is passed by means of a guide (13) into connection with the rear carrier drum (17), and the threading wedge is carried on the face of the rear carrier drum (17) by means of the suction present in the carrier drum (17), and the threading wedge is separated from the face of the rear carrier drum (17) by means of blowing (18), which guides the wedge over the forward carrier drum (16). A method as claimed in any of the claims 1 to 3, characterized in that by means of the wedge making device (4) the threading wedge (W') is cut to one edge of the web (W), that, after the threading wedge (W') has proceeded a certain distance through the winding device, the wedge (W') is widened to the opposite edge of the web (W) by shifting the wedge making device (4) accordingly, and that the threading wedge (W') is passed through the winding device by means of a grasping device (25) extending substantially over the entire length of the winding device. A method as claimed in claim 1, characterized in that from the web reel (2) the web (W) is pulled as of substantially full width into the pulper, and a threading wedge (W') is cut from the web (W), that the threading wedge (W') that was cut from the web (W) is guided by means of a guide plate (22) or equivalent to the threading devices, by means of which threading devices the threading wedge is passed through the winding device, and that, after the threading wedge (W') has proceeded a part of the distance through the winding device, the threading wedge is widened to full width of the web. A method as claimed in claim 1, characterized in that the threading wedge (W') is cut on the face of the web reel (2), that the end of the threading wedge (W') is picked up from the face of the web reel (2) and passed to the threading devices, by whose means the threading wedge (W') is passed through the winding device, and that, after the threading wedge has proceeded a certain distance through the winding device, the threading wedge is widened to full width of the web (W). A method as claimed in any of the preceding claims, characterized in that , after the web (W) has- passed through the winding device, the web (W) is cut off and new roll spools are inserted, and the winding is started. A device for carrying out the method as claimed in any of the preceding claims in the threading of a paper web or of an equivalent web-like material in a winding device, in particular in a slitter-winder, which winding device comprises members for winding the paper web (W) or the equivalent web-like material from the web reel (2) or equivalent onto another roll, characterized in that the device comprises a pulling device (1) or equivalent for unwinding the web (W) from the web reel, a wedge-making device/devices (4) for cutting the threading wedge (W') substantially at the same time from the web (W), and threading devices for passing the threading wedge (W') through the winding device substantially at the same time. A device as claimed in claim 11, characterized in that the pulling device for unwinding the web (W) from the web reel (2) is a suction roll (1). A device as claimed in claim 11 or 12, characterized in that the threading members of the device comprise a number of guides (7,9,10,13,15,22), preferably guide plates, for passing the web through the winding device. A device as claimed in claim 11, characterized in that the threading members of the device consist of a grasping device (25) extending over the entire distance of the winding device. A device as claimed in claim 11, characterized in that the device comprises an arrangement for pulling the web (W) as of substantially full width into the pulper. A device as claimed in claim 11, characterized in that the wedge making device (14) is fitted on the face of the web reel (2), and that the web reel (2) pulls the web (W) at the wedge making device (4).

Inventors: AKERLUND KENNETH, AKERLUND, KENNETH
Applicants: METSO PAPER INC, METSO PAPER, INC.
Application year: 1997
Main classification: B65H19
IPC codes: B65H19