[001] This application claims priority of US provisional patent application 62/408,958 filed October 17, 2016.

Technical Field

[002] This application relates to paper manufacturing, and in particular to a turn up process and apparatus in paper manufacturing.

Background

[003] The turn up process in paper manufacturing is the transfer of a paper web from a parent roll to a new roll in a paper making machine. PCT/CA2013/050056 filed 28 January 2013 in the name of Paprima Industries, Inc. and published as WO2013/1 13110 on 8 August 2013 describes a web turn-up cutting apparatus and method in which an X- shaped cut is performed using water knives that creates two wing portions.

[004] In some circumstances, the wing portions can interfere with the turn up process or otherwise require special operator attention for disposal.

Summary

[005] Applicant has discovered that a paper web can be cut with multiple points turning up. This has the advantage of providing better symmetry of feed of web material at the start of the new roll, while providing a termination to the full reel that is less prone to flapping and/or breaking off of tail material.

[006] Applicant has discovered that a V-shaped or a Y-shaped cut can be used to cause the turn up onto the new roll to happen from both sides of the web without leaving any portion of the web cut away to require disposal, while providing a symmetric feed of web material at the start of the new roll. The V-shape at the same time is formed on the severed end of the completed full roll, which, being approximately symmetrical, is more stable and less prone to loosening or shifting, or tearing off, and therefore is beneficial to the production process.

[007] A paper-making machine and process, in which a paper web passes over a pope roller to a main roll and a new roll can be brought into contact with the pope roller when the main roll becomes a full roll, can be improved by arranging at least two paper cutting tools to cut a paper web from each of two outer lateral edges to form two or more leader portions. A tail of the paper web formed on the full roll is symmetric and the leader portions on the new roll are also symmetric. Adhesive spray or tape can be applied to the paper web in the area of the leader portions. Air jets can also be used to bias the leader portions towards a surface of the new roll.

[008] In some embodiments, there is provided a method for manufacturing paper in a paper-making machine, the method comprising feeding a continuous paper web toward a full roll, using a cutting tool, preferably a water jet cutting tool arranged to cut the paper web on a roll at two or more points, to cause the web to turn up onto a new roll with two or more leader portions, wherein the tail of the web formed on the full roll is symmetric and the leader portions on the new roll are also symmetric, and the full roll is decelerated and removed from the paper making machine.

[009] In some embodiments, there is provided a method for manufacturing paper in a paper-making machine, the method comprising feeding a continuous paper web toward a full roll, using a cutting tool to cause the continuous paper web to turn up onto a new roll with two or more leader portions, decelerating the full roll; and removing the full roll from the paper making machine. In this way, a tail of the web formed on the full roll is symmetric and the leader portions on the new roll are also symmetric.

[0010] Preferably, the cutting tool used is a water jet cutting tool arranged to cut the paper web on a roll at two or more points. [001 1] Preferably, an adhesive is applied in an area corresponding to the two or more leader portions to help the paper web adhere to the new roll. Preferably, the adhesive is applied to the web, and can be applied using a spray or using a tape.

[0012] Preferably, the cutting tool is a water jet cutting tool arranged to cut the paper web on the new roll at two or more points, and the adhesive is provided by residual water on the new roll.

[0013] Preferably, the method further comprises providing a plurality of air jets to bias the two or more leader portions towards a surface of the new roll.

[0014] Preferably, the two or more leader portions comprise two leader portions, the cutting tool comprising two knifes performing cuts beginning from outer lateral edges of the paper web and joining near a midpoint of the paper web.

[0015] Preferably, the two or more leader portions comprise three leader portions, the cutting tool comprising two knifes performing cuts beginning from outer lateral edges of the paper web and the cuts meet, or cross over at least once near the midpoint of the paper web forming two leader portions at the outer lateral edges followed by a leader portion at the midpoint. The cuts may cross over twice near the midpoint.

[0016] In some embodiments, there is provided a web turn-up apparatus for use in a paper-making machine in which a paper web passes over a pope roller to a main roll and a new roll can be brought into contact with the pope roller when the main roll becomes a full roll. The apparatus may comprise at least two paper cutting tools arranged to cut a paper web from each of two outer lateral edges to form two or more leader portions. In this way, a tail of the paper web formed on the full roll is symmetric and the leader portions on the new roll are also symmetric.

[0017] Preferably, the apparatus further comprises an adhesive applicator.

[0018] Preferably, the cutting tools comprise water knife jets. Preferably, the water knife jets are arranged to cut the paper web on the new roll, wherein residual water on the new roll provides an adhesive for the two or more leader portions. [0019] Preferably, the apparatus further comprises a plurality of air jet sources to bias the two or more leader portions towards a surface of the new roll.

Brief Description of the Drawings

[0020] The invention will be better understood by way of the following detailed description of embodiments of the invention with reference to the appended drawings, in which:

[0021] Figure 1A is a diagram illustrating a side view of wind up equipment in a paper making machine in which a water knife cut is performed on the pope or reel drum or roller showing an adhesive spray unit located before the cutting station;

[0022] Figure 1 B is a diagram illustrating a side view of wind up equipment in a paper making machine in which a water knife cut is performed on the pope or reel drum or roller showing an air jet located on the pope roller to redirect the severed web up onto the new roll;

[0023] Figure 2A is a diagram illustrating a side view of wind up equipment in a paper making machine in which a water knife cut is performed on a surface of the new roll following the pope or reel drum or roller showing an adhesive spray unit located before the pope roller;

[0024] Figure 2B is a diagram illustrating a side view of wind up equipment in a paper making machine in which a water knife cut is performed on a surface of the new roll following the pope or reel drum or roller showing an air jet located after the new roll to redirect the severed web up onto the new roll;

[0025] Figure 3A is a diagram showing a triangular shape cut at the tail on the full roll;

[0026] Figure 3B is a diagram showing a two point leader portion of the web forming the new roll;

[0027] Figure 4A is a diagram showing a two point turn up (non-crossing) in which the cuts stop when they join, with adhesive applied to the 2 leading points; [0028] Figure 4B is a diagram showing a two point turn up (non-crossing) in which the cuts stop after they join, with adhesive applied to the 2 leading points;

[0029] Figure 5 is a diagram showing a two point turn up (non-crossing) in which additional adhesive is applied to the base of the V or Y of the cut;

[0030] Figure 6 is a diagram showing a three point turn up (crossing) in which the cuts stop after they cross within the sheet, with adhesive applied to the 3 leading points;

[0031] Figure 7 is a diagram showing a three point turn up (crossing) in which the cuts do not stop after they cross within the sheet, with adhesive applied to the 3 leading points;

[0032] Figure 8 is a diagram showing a three point turn up (crossing) in which the cuts stop after they cross within the sheet with a deviated path, with adhesive applied to the 3 leading points;

[0033] Figure 9 is a diagram showing a four point turn up (crossing) in which the cuts do not stop after they cross within the sheet with an alternative path, with adhesive applied to the four leading points; and

[0034] Figure 10 is a diagram showing a four point turn up (crossing) in which the cuts stop after they cross within the sheet with an alternative path, with adhesive applied to the four leading points.

Detailed Description

[0035] The following is a description of a process to turn up paper onto a new empty spool, in a machine which makes or converts paper, paperboard, or other type of webs. The particular features of this process are that the process of severing the sheet is initiated from outside the sheet, in order to generate a triangular shaped cut on the full roll, preferably with a water jet, preferably cutting on a roll surface, whereby the cuts join or cross, near the middle of the sheet, and whereby at least 2 points (or all downstream facing points) are adhered to and turned up on the new spool. [0036] The method of severing the sheet from the outside will create an approximately symmetrical triangular shape on the severed end of the sheet going to the full roll. After the turn up, while the full roll is decelerating, such a shape will be less prone to loosening, flapping, or moving sideways, and therefore will be less prone tearing off bits of paper which can fly around and interfere with the production process.

[0037] For most paper types, water jet cutting is best done on a roll so that the severed portion is supported until the turn up. The roll on which the paper web is cut can be the pope roller and the reel drum against which the new roll is contacted, as illustrated in Figure 1A. An adhesive sprayer or application device can work in conjunction with the cutting device as illustrated. Alternatively, when the new roll is positioned as illustrated in Figure 2A, the web can wrap partially around the new roll, and the water knives can cut the web on the new roll.

[0038] Instead of or in addition to the use of adhesive, a plurality of air jet nozzles or sources can be provided as illustrated in Figures 1 B and 2B to direct or to bias the leader portions towards a surface of the new roll. In the case of Figure 1 B, this involves an air knife that peels the web away from the pope roller and deflects the leader portions towards the new reel.

[0039] Figure 3A shows the triangular shape on the full roll.

[0040] A corresponding inverted triangular shape will then be created on part of the sheet which will be turned up on the new spool, as shown in Figure 3B. The result is that there are at least 2 points which will turn up onto the spool. The points will be adhered to the new spool.

[0041] There are various profile possibilities. For example, in Figure 4A, adhesive can be applied to the sides where the cuts are started, preferably before and after the cut. The cuts can stop immediately when they join as in Figure 4A, or they can stop after they join as shown in Figure 4B. Figure 5 shows that adhesive can be applied in the middle of the web where the cut lines join. [0042] The cuts are initiated from outside the sheet, and join, at or near the middle of the sheet. It is advantageous to reduce paper cutting loss by pressurizing the jet outside the sheet. The cutting stops preferably when both cuts meet, which reduces paper cutting loss. The cut can be stopped quickly by various methods not discussed here. The cut may also stop after the cuts meet.

[0043] Adhesive can be applied onto the sheet (directly or indirectly) close to each of the sheet edges, so that there is adhesive on at least the upstream extremity of any upstream side (leading edge) of the cut for the purpose of adhering the sheet to the new spool, and preferably additionally on the downstream side (trailing edge) of the cut, for the purpose of adhering the severed downstream part of the sheet to the full roll to assist in preventing the wound paper from loosening. The adhesive may be a sprayed liquid, or tape. If sprayed, the location of the adhesive applicator may be either up- or downstream of the cutting device. In the case of tape, the location of the applicator is preferably upstream of the cutting device, so that the tape will be severed along with the web.

[0044] Adhesive can additionally be applied onto the sheet (directly or indirectly) generally in the middle and in line with the point of the triangular shaped trailing edge, so that there is adhesive at least on the downstream side of the cut, for the purpose of adhering the triangular point to the full roll. This is advantageous to assist in preventing the wound full roll from loosening.

[0045] It will be appreciated that water can also act as an adhesive for the web to adhere to the desired roll. When water is used as the sprayed liquid, a separate nozzle can be used, or alternatively, the water cutting jet can also be used for applying water to act as the adhesive. This can be done by having the water knife arranged on the opposite side of the sheet as in Figure 2 so that the water from the water knife goes through the paper and onto the surface of the new spool, and can adhere the paper. This water is a "sprayed liquid" but it does not need a separate applicator. [0046] In addition to spraying a liquid or using a tape for adhesion purposes, it will be appreciated that air can be used to blow up the tip. This applies, for example, to configurations like the ones illustrated in Figures 1 B and 2B. The air blowing device would be located on the downstream side of the new spool.

[0047] In the embodiment of Figure 6, the cuts are initiated from outside the sheet, and at least meet or cross, at or near the middle of the sheet, and whereby a central leading edge point or points is/are created. It is advantageous to reduce paper cutting loss by pressurizing the jet outside the sheet. As shown in Figure 6, the cutting stops after both cuts cross, and before reaching the adjacent sheet edge. This is advantageous, as the severed portion of the sheet turning up onto the new spool is contiguous, and therefore can be completely unwound without interruption.

[0048] As shown in Figure 7, the cutting in this embodiment does not stop after both cuts meet, and completely severs the sheet. As shown in Figure 7, adhesive is applied onto the sheet (directly or indirectly) close to each of the sheet edges, and also at the crossing point or points, so that there is adhesive on at least the upstream extremity of any upstream side (leading edge) of the cut for the purpose of adhering the sheet to the new spool, and preferably additionally on the downstream side (trailing edge) of the cut, for the purpose of adhering the severed downstream part of the sheet to the full roll to assist in preventing the wound paper from loosening. The adhesive may be a sprayed liquid, or tape. If sprayed, the location of the adhesive applicator may be either up- or downstream of the cutting device. In the case of tape, the location of the applicator is preferably upstream of the cutting device, so that the tape will be severed along with the web.

[0049] In the embodiments of Figures 8 and 9, an alternative motion of the cutting mechanism (e.g. water jets) generates profiles of different shapes. In Figure 8, the motion of the cutting tool is arrested. In Figure 9, the cutting tools generate profiles which meet once, or cross twice before continuing to the lateral sides edges. In the embodiment of Figure 10, the cuts are stopped after the second crossing.

[0050] It is possible to prevent a water knife jet from cutting or applying water to the paper web at the end of its cut by positioning an absorbing member or deflecting member in the final position path of the water knife.

[0051] In some embodiments, the water knife cutting tool can comprise a motorized mounting supporting two or more water knife nozzles with a processor (or other electronic hardware) based controller for controlling the motion of the nozzles, actuation of the water jets and optionally any adhesive supplying devices. Details of such an apparatus can be found, for example, in PCT/CA2013/050056 filed 28 January 2013 in the name of Paprima Industries, Inc. and published as WO2013/1 13110 on 8 August 2013. In these embodiments, the method as described above can be performed by providing processor instructions to cause the water knife nozzles to cut the paper web with the improved cutting pattern as described above. These instructions can be stored in a memory product that when loaded into the processor (or configurable hardware) of the turn-up apparatus will cause the apparatus to perform an improved turn-up as described above.