Web switching device and web switching method

Abstract

To provide a web switching device and a web switching method capable of keeping the joints and cut portions of a web in good condition and switching the web without adversely affecting the process after switching.SOLUTION: The web switching device switches a web whose length direction is the conveying direction from a first web to a second web by joining the first web and the second web. The web switching device comprises pressure joining means, first web contact means and a cutting blade that cuts the first web when at least one of the first web contact means or the cutting blade moves.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a web switching device and a web switching method. [Background technology]

[0002] Webs, which are sheet-like materials, are often manufactured as raw rolls wound on a roll. When processing a web, it is unwound from the raw roll and the work is carried out. In this case, the web is joined from the old raw roll, which has become short, to a new raw roll. This work is also called splicing.

[0003] A splice cutting device is known that uses a rotary blade to reliably cut even high-strength long materials such as paperboard (Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-316005 Summary of the Invention [Problem to be solved by the invention]

[0005] When joining the webs, the web of the old web roll and the web of the new web roll are joined together, and then the web of the old web roll is cut. However, after cutting the web of the old web, the excess web portion of the old web formed on the web of the new web may adversely affect subsequent processes. Therefore, in order to keep the excess web portion of the old roll as short as possible, the web of the old roll was cut near the joint between the web of the old roll and the web of the new roll, which sometimes damaged the web wrapped around the new roll. Furthermore, in order to avoid damaging the web wound around the new roll, the web of the old roll was cut and then joined to the web of the new roll, which could cause wrinkles, tilts, etc. near the joint, and could cause the web to break during subsequent transport.

[0006] The present disclosure has been made in light of the above. The problem to be solved by the embodiments of the present disclosure is to provide a web switching device and a web switching method that can keep the joints and cut sections of the web in good condition and switch the web without adversely affecting the processes after switching. [Means for solving the problem]

[0007] Specific means for solving the problems include the following aspects. <1> a first web contact means arranged in line with the pressure joining means in the transport direction of the first web, contacting the other surface of the first web in the width direction of the first web and configured to be movable at least in a direction intersecting the surface of the first web; and a cutting blade arranged between the first web contact means and the pressure joining means, the cutting blade having a blade portion having a length in the width direction equal to or greater than the width of the first web, wherein the cutting blade cuts the first web as at least one of the first web contact means and the cutting blade moves. <2> The first web contact means has a curved surface that is convex across the width of the surface that contacts the other surface of the first web. <1> The web switching device according to claim 1. <3> The first web contacting means includes a fastening means for fastening the first web in contact therewith. <1> or <2> 2. The web switching device according to claim 1 . <4> The fixing means is a suction means. <3> The web switching device according to claim 1. <5> The blade portion has a shape having a plurality of peaks and a plurality of valleys alternating in the longitudinal direction. <1> ~ <4> 10. The web switching device according to claim 9, wherein the first and second webs are connected to each other. <6> The web is a metal foil or a resin film with a thickness of 100 μm or less. <1> ~ <5> 10. The web switching device according to claim 9, wherein the first and second webs are connected to each other. <7> A web switching method for switching a web whose length direction is the transport direction from a first web to a second web by joining the first web and the second web, the web switching method comprising the steps of: joining the first web and the second web while one surface of the tip of the second web is in contact with one surface of the first web and the first web are overlapped; bringing the other surface of the first web into contact with a first web contact means in the width direction of the first web; and cutting the first web with a cutting blade, wherein the step of cutting the first web is performed by moving at least one of the first web contact means and the cutting blade. <8> The step of bringing the other surface of the first web into contact with the first-web contact means includes fixing the first web by a fixing means provided on the first-web contact means. <7> 2. The web switching method according to claim 1 . <9> The fixing means is a suction means. <8> 2. The web switching method according to claim 1 . <10> The first web is cut by at least one of the first web contact means moving in a direction intersecting the surface of the first web while fixing the first web, and the cutting blade moving toward the surface of the first web. <8> or <9> 2. The web switching method according to claim 1 . <11> The step of cutting the first web includes moving the first-web contact means in a direction intersecting the surface of the first web while fixing the first web, and then moving the cutting blade toward the surface of the first web. <8> ~ <10> 10. A web switching method according to claim 9. <12> The web is a metal foil or a resin film having a thickness of 100 μm or less. <7> ~ <11> 10. A web switching method according to claim 9. [Effects of the Invention]

[0008] According to the embodiments of the present disclosure, a web switching device and a web switching method are provided that allow the web to be switched while maintaining good joints and cuts in the web and without adversely affecting subsequent processes. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is an explanatory diagram illustrating the configuration of a conventional web switching device as viewed from the width direction. [Figure 2] FIG. 2 is an explanatory diagram illustrating the configuration of the web switching device in the first embodiment when viewed from the width direction. [Figure 3] FIG. 3 is an explanatory diagram illustrating the configuration of a web switching system including a web switching device according to the first embodiment, as viewed from the width direction. [Figure 4] FIG. 4 is an explanatory diagram illustrating the web switching device in the first embodiment when viewed from the width direction. [Figure 5] FIG. 5 is an explanatory diagram illustrating the cutting edge of the cutting blade. [Figure 6] FIG. 6 is an explanatory view illustrating cutting of the first web using the web switching device in the first embodiment, as viewed from the width direction. [Figure 7] FIG. 7 is an explanatory view illustrating cutting of the first web using the web switching device in the first embodiment, as viewed from the width direction. [Figure 8] FIG. 8 is an explanatory view illustrating the state of the first web after it has been cut using the web switching device according to the first embodiment, as viewed from the width direction. [Figure 9] FIG. 9 is an explanatory diagram illustrating the web switching device according to the second embodiment when viewed from the width direction. [Figure 10] FIG. 10 is an explanatory view illustrating cutting of the first web using the web switching device in the second embodiment, as viewed from the width direction. [Figure 11]FIG. 11 is an explanatory view illustrating cutting of the first web using the web switching device in the second embodiment, as viewed from the width direction. [Figure 12] FIG. 12 is an explanatory diagram illustrating the web switching device according to the third embodiment when viewed from the width direction. [Figure 13] FIG. 13 is an explanatory view illustrating cutting of the first web using the web switching device in the third embodiment, as viewed from the width direction. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. The present disclosure is not limited to the following embodiments and can be implemented with appropriate modifications within the scope of the object of the present disclosure. Components indicated by the same reference numerals in each drawing are the same components. Explanations of duplicated components and reference numerals in each drawing may be omitted. Reference numerals may be assigned to some of the components in each drawing. The sizes of the components in each drawing are conceptual, and the relative size relationships between the components are not limited thereto.

[0011] In the present disclosure, a numerical range expressed using "to" means a range that includes the numerical values ​​before and after "to" as the upper and lower limits. In the numerical ranges described in stages in the present disclosure, the upper or lower limit described in a certain numerical range may be replaced with the upper or lower limit of another numerical range described in stages. Furthermore, in the numerical ranges described in the present disclosure, the upper or lower limit described in a certain numerical range may be replaced with a value shown in the examples.

[0012] In this specification, "orthogonal" does not mean strictly 90°, but means 90°±10°, preferably 90°±5°. Furthermore, "parallel" does not mean strictly 0°, but means 0°±10°, preferably 0°±5°. Furthermore, "45°" does not mean strictly 45°, but means 45°±10°, preferably 45°±5°. The same applies to 0°, 90°, etc., and do not mean strictly 0°, 90°, etc.

[0013] In the present disclosure, the term "process" includes not only independent processes but also processes that cannot be clearly distinguished from other processes as long as the intended purpose of the process is achieved. In the present disclosure, when a plurality of substances corresponding to each component are present in the composition, the amount of each component in the composition means the total amount of the plurality of substances present in the composition, unless otherwise specified. In the present disclosure, a combination of two or more preferred aspects or embodiments is a more preferred aspect or embodiment.

[0014] In this disclosure, "machine direction" means the direction in which the web is transported, and "cross direction" means the direction across the width of the web.

[0015] The process leading to the embodiments of the present disclosure will be described. Conventionally, when joining a new web from an old web roll, a method of automatically switching and cutting the old web roll by feeding it out has been adopted in some cases. As shown in Figure 1, in a switching method using a conventional web switching system 100, first, by rotating a movable shaft 111 carrying an old web 103 and a new web 101, one surface of a web 104 of the old web 103 is attached to the surface of a leading end 105 of the web of the new web 101 with adhesive tape or the like attached to the surface of the leading end 105 of the web of the new web 101. Then, while a pressure roller 107 is used to press down on a joint 106 where the web 102 of the new web 101 and the web 104 of the old web 103 are joined, a saw blade 108 the length of which is the width of the old web is used to pierce the web 104 of the old web 103, thereby cutting the web 104 of the old web 103 at a cutting line 109.

[0016] At this time, the old web 103 may be cut in a state where the web 104 is not joined to the new web 101 near the joint 106 between the new web 101 and the old web 103, leaving an unnecessary portion 110 of the web 104 of the old web 103. For example, the unnecessary portion 110 may be folded back during transport, which may cause problems such as the web breaking during the process. The web is transported in the transport direction d.

[0017] In order to shorten the unnecessary portion 110 as much as possible, a saw blade 108 is thrust into the web 104 of the old roll 103 as close as possible to the joint 106 between the web 104 of the old roll 103 and the web 102 of the new roll 101, thereby cutting the web 104 of the old roll 103. However, since the pressure roller 107 uses the outer periphery of the new roll 101 as a support to press the joint 106 while piercing the saw blade 108, there is a possibility that the web 104 of the old roll 103 will be cut as close as possible to the joint 106 between the web 104 of the old roll 103 and the web 102 of the new roll 101, thereby damaging the web 102 wrapped around the new roll 101.

[0018] Furthermore, in order to avoid damaging the web 102 wound around the new original roll 101, the web 104 of the old original roll 103 was cut and then joined to the web 102 of the new original roll 101, which could result in defects such as wrinkles or tilts near the joining point 106, or cut areas such as tears, which could cause the web to break during subsequent transport.

[0019] The inventors of the present invention have thoroughly investigated methods for switching webs effectively, and have focused on cutting the web of the old web by controlling the state of the web of the old web. They have adopted a first web contacting means that contacts the web of the old web, and have decided to use the first web contacting means and other means in conjunction with each other. This has enabled the old web and the new web to be joined together well, and the old web can be cut without wrinkles, tears, or other poor cutting quality, even with a short unnecessary portion, and without damaging the new web. This has made it possible to switch webs well, leading to the completion of an embodiment of the present disclosure.

[0020] According to the web switching device and web switching method disclosed herein, the web of the old raw roll and the web of the new raw roll can be joined well, and with the unnecessary portion kept short, there are no defects at the joining point such as wrinkles or tilts, and no defects at the cutting point such as tears, and the old raw roll can be cut without damaging the web of the new raw roll. Therefore, the web switching device and web switching method disclosed herein are web switching devices and web switching methods that leave the joints and cuts of the web in good condition and allow the web to be switched without adversely affecting the processes that follow the switching. Furthermore, the web switching method of the present disclosure can be performed automatically and can suppress adverse effects on subsequent processes caused by web switching. Therefore, the web switching device and web switching method of the present disclosure can improve the efficiency of web switching work and reduce costs by suppressing the occurrence of defective products.

[0021] First Embodiment <Web switching device> The web switching device disclosed herein is a web switching device that switches a web whose length direction is the conveying direction from the first web to the second web by joining a first web, which is a web of an old raw roll, to a second web, which is a web of a new raw roll, and is equipped with a pressure joining means, a first web contact means, and a cutting blade. The pressure joining means joins the first web and the second web by pressing the first web in the width direction of the web while one surface of the tip of the second web is in contact with one surface of the first web and the two are overlapped. The first web contact means is arranged in a row with the pressure joining means in the conveying direction, is configured to be movable at least in a direction intersecting the surface of the first web, and contacts the other surface of the first web in the width direction. The cutting blade is disposed between the first web contact means and the pressure joining means, and has a blade portion whose length in the width direction is equal to or greater than the width of the first web. In the web switching device of the present disclosure, at least one of the first web contact means and the cutting blade moves, causing the cutting blade to cut the first web.

[0022] 2, the web switching device 10 in the first embodiment includes a pressure joining means 11, a first web contact means 12, and a cutting blade 13. The pressure joining means 11, the first web contact means 12, and the cutting blade 13 are configured to be independently movable. The pressure joining means 11, the first web contact means 12, and the cutting blade 13 are attached to a movable holding member 14, and the pressure joining means 11, the first web contact means 12, or the cutting blade 13 moves as the holding member 14 moves. The pressure joining means 11, the first web contact means 12, and the cutting blade 13 may also be configured to be independently movable.

[0023] (Pressure joining means) The pressure joining means 11 is a means for joining the first web and the second web by pressing the first web in the width direction of the web while one surface of the tip of the second web is in contact with one surface of the first web and the two are overlapped.

[0024] The pressure joining means 11 joins the first web and the second web by pressing the first web in the width direction of the web, so it is preferable that it has a long side in the width direction of the web and a width in the conveying direction, for example, a rectangular parallelepiped shape.

[0025] In this embodiment, as shown in Figure 3, in a web switching system 200 including a web switching device 10, the pressure joining means 11 is positioned vertically above the first web 16 of the old raw roll 15, and a new raw roll 17 having a second web 18 is positioned vertically below the first web 16. Then, the old web 15 and the new web 17 are rotated back in the opposite direction to the conveying direction, so that the leading end 20 of one surface 19 of the second web 18 and one surface 21 of the first web 16 come into contact and are superimposed on each other. The pressure joining means 11 moves from vertically upward to vertically downward toward the joining location where the leading end 20 of one surface 19 of the second web 18 and one surface 21 of the first web 16 come into contact and are superimposed on each other. Note that the movement direction of the pressure joining means depends on constraints such as the joining location and the surrounding facility space, and is therefore not limited to the vertical direction relative to the joining location.

[0026] 4, the pressure splicing means 11 uses the outer periphery of the new web 17 as a support to press the first web 16. In FIG. 4, the arrow attached to the web switching device 10 indicates the direction in which the pressure splicing means 11 presses the first web 16. As a result, the first web 16 and the second web 18 are spliced ​​together at the joining portion.

[0027] When the pressure joining means 11 presses the first web 16 in the width direction of the web, a support may be used. For example, the outer peripheral surface of the second web 18 can be used as the support. In this case, the surface of the pressure joining means 11 that comes into contact with the first web 16 may have a shape that corresponds to the support. In the case of this embodiment, the surface of the pressure joining means 11 that comes into contact with the first web 16 may have an arc shape that corresponds to the outer surface of the new web 17.

[0028] In addition, the arrangement of the old raw roll 15, new raw roll 17, etc. is not limited to the above arrangement, as long as the pressing joining means 11 can join the first web 16 and the second web 18 by pressing the first web 16 in the width direction of the web while one surface 19 of the tip end 20 of the second web 18 and one surface 21 of the first web 16 are in contact and overlapped with each other.

[0029] In this embodiment, a joining member 22 such as adhesive tape is placed on a leading end 20 of one surface of the second web 18, and the first web 16 and the second web 18 are joined by the joining member 22. The joining method is not limited to the method using the joining member 22 (see FIG. 3). For example, if the web is a thin thermoplastic resin film, the pressure joining means 11 may be provided with a heating mechanism on the surface that contacts the first web 16, and the pressure joining means 11 may join the first web 16 and the second web 18 by pressing the first web 16 while heating it.

[0030] (First web contact means) The first web contact means 12 is arranged in a row with the pressure joining means in the conveying direction, is configured to be movable at least in a direction intersecting the surface of the first web, and contacts the other surface of the first web in the width direction.

[0031] The first web contact means 12 are arranged in a row in the conveying direction d, and are disposed upstream of the pressure-splicing means 11 in the conveying direction d. In some cases, they may be disposed downstream of the pressure-splicing means 11 in the conveying direction d.

[0032] The first web contact means 12 is configured to be movable in a direction intersecting the surface of the first web 16. The first web contact means 12 may be provided with a control device 23 that controls the movement. The first web contact means 12 moves from vertically above the first web 16 to the surface of the first web 16 and comes into contact with the other surface 24 of the first web 16 in the width direction. After contacting the first web 16, the first web contact means 12 preferably presses the first web 16. The degree of pressing is preferably adjusted by a control means for controlling the movement. The first web contact means 12 presses the first web 16 while contacting the other surface 24 of the first web 16, so that the state of the first web 16 is controlled so that wrinkles do not occur in the portion of the first web 16 that contacts the first web contact means 12.

[0033] The shape of the first web contact means 12 is preferably rectangular, for example, with long sides in the width direction of the web and short sides in the conveying direction d, since it contacts the other surface 24 of the first web 16 in the width direction. More preferably, the first-web contact means 12 has a curved surface that is convex across the width of the web on the surface that contacts the other surface 24 of the first web 16. The convex curved surface of the first-web contact means 12 that contacts the first web 16 moderately stretches the first web 16 near the contact point, and controls the state of the first web 16 to prevent wrinkles from forming in the first web 16.

[0034] (cutting blade) The cutting blade 13 is disposed between the first web contact means 12 and the pressure joining means 11, and has a blade portion whose length in the width direction is equal to or greater than the width of the first web 16. The cutting blade 13 is disposed between the first web contact means 12 and the pressure joining means 11, so that the first web contact means 12, the cutting blade 13, and the pressure joining means 11 are disposed in this order from upstream in the conveyance direction d.

[0035] When cutting the first web 16, the cutting blade 13 preferably cuts the first web 16 at a cutting position that is upstream of the pressure joining means 11 in the conveyance direction d and that is as close as possible to the joint between the first web 16 and the second web 18. Therefore, the cutting blade 13 is preferably disposed at a position that allows the blade portion to be positioned at a cutting position as close as possible to the joint between the first web 16 and the second web 18. This allows the cutting blade 13 to cut the first web 16 while leaving the unnecessary portion as short as possible after cutting the first web 16.

[0036] The cutting blade 13 has a blade portion whose length in the width direction is equal to or greater than the width of the first web 16. The blade portion is provided on the cutting blade 13 at a portion that comes into contact with the first web 16. The cutting blade 13 has a blade portion 25 at its longitudinal end. As shown in FIG. 5, the longitudinal direction x of the blade portion 25 is the same as the width direction of the web, and the dimension in the longitudinal direction x is equal to or greater than the width of the first web 16. Therefore, the cutting blade 13 can cut the entire width of the first web 16 in one go. This maintains the linearity of the cut portion of the first web 16 and reduces adverse effects on subsequent processes.

[0037] The first web 16 is cut by moving at least one of the cutting blade 13 and the first-web contact means 12. The first web 16 may be cut by moving both the cutting blade 13 and the first-web contact means 12.

[0038] 6, when the cutting blade 13 moves, the cutting blade 13 moves so as to press the blade portion 25 against the first web 16, thereby cutting the first web 16. Preferably, the cutting blade 13 is moved so that the blade portion 25 faces upstream in the conveyance direction by tilting the cutting blade 13 so as not to damage the second web 18 present on the outer surface of the new web 17.

[0039] 7, when the first web contact means 12 moves, it is positioned so that, for example, a portion of the blade portion 25 of the cutting blade 13 pierces the cutting portion of the first web 16. Then, the first web contact means 12 is moved, for example, in a direction away from the cutting blade 13. As a result, the first web 16 pierced by the blade portion 25 of the cutting blade 13 is cut by the entire first web 16 being pulled from the blade portion 25 as a starting point.

[0040] The first web 16 may be cut by moving both the cutting blade 13 and the first-web contact means 12. In this case, for example, the cutting blade 13 is moved in a direction in which the blade portion 25 is tilted upstream in the conveyance direction, and the first-web contact means 12 is moved in the upstream direction e in the conveyance direction. By moving both the cutting blade 13 and the first-web contact means 12, the first web 16 can be cut more reliably and with fewer defects such as tears in the cut portion of the first web 16.

[0041] After cutting the first web 16, the web switching device 10 preferably moves the first web 16 vertically upward so as to intersect with the surface of the first web. After cutting, the second web 18 is transported from the new web, but this is to prevent any adverse effects, such as the dropping of debris onto the second web 18. 8, after cutting, the second web 18 is transported from the new web while having the joint 26. In this way, the web switching is completed.

[0042] The web switching device 10 of the present disclosure is configured as described above, and therefore is able to cut the first web 16 in the immediate vicinity of the joint 26 between the first web 16 and the second web 18. After cutting, it is possible to produce almost no unnecessary portions 27. Therefore, according to the web switching device 10 of the present disclosure, it is possible to switch the web without adversely affecting the subsequent processes.

[0043] It is preferable that the blade portion 25 has a shape that alternates between peaks and valleys in the longitudinal direction (see FIG. 5). When the cutting blade 13 is installed, it may have a shape that alternates between peaks 31 and valleys 32 over the entire length of the blade portion 25 in the longitudinal direction x when viewed from the conveyance direction. This allows the cutting blade 13 to pierce the first web 16 more stably, enabling more reliable cutting without poor cutting performance.

[0044] When the blade portion 25 is pressed against the other surface 24 of the first web 16, the ridges 31 can pierce the first web 16. The degree of piercing is preferably such that the ridges 31 do not penetrate the first web 16 so as not to damage the second web 18 that is present in the direction in which the cutting blade 13 cuts the first web 16, and is preferably such that even if the ridges 31 partially penetrate the first web 16, they do not damage the second web 18.

[0045] The shape of the peaks 31 and valleys 32 is preferably such that the depth p, which is the distance between the apex a of the peaks 31 and the bottom b of the valleys, is equal to or less than a preset length. The shape of the waste portion 27 generated after cutting is preferably linear so as not to adversely affect subsequent processes. This is because, depending on how the first web 16 is cut by the cutting blade 13, the shape of the cut portion of the first web 16 may become similar to the shape of the cutting edge 25. Furthermore, if the depth p is large, chips may be generated after cutting. In this embodiment, the length of the blade portion 25 in the longitudinal direction x is a length slightly exceeding the width of the web, 1500 mm, for example, 1600 mm. In this case, the blade portion 25 has six peaks 31 and five valleys 32, and has a depth p of 10 mm. In this case, the depth p is preferably 5 mm to 10 mm.

[0046] Furthermore, it is preferable that the blade portion 25 has a sawtooth shape as a whole. This allows the first web to be cut more reliably and without poor cutting performance. The shape of the sawtooth may be determined according to the type of web to be cut. Even when the blade portion 25 has a shape having peaks 31 and valleys 32, it is preferable that the peaks 31 and valleys 32 are formed while having fine sawtooth.

[0047] In the web switching device 10 of the present disclosure, the web is preferably a metal foil or a resin film having a thickness of 100 μm or less. In the case of a metal foil, the thickness is preferably 5 μm to 20 μm, and in the case of a resin film, the thickness is preferably 10 μm to 50 μm. The web switching device 10 can switch the web while minimizing the influence on subsequent processes, even if the web is in the form of a thin film like these. When the web is a thin film, particularly when it is a long object that is relatively long in the width direction, it is difficult to cut it all at once at the desired cutting position, and it is also difficult to cut it without poor cutting ability. However, according to the web switching device 10 of the present disclosure, even if the web is in the form of a thin film as described above, it is possible to cut the first web 16 in one go, reliably, at a cutting position that produces almost no unnecessary parts 27, and without any poor cutting performance such as wrinkles or tears in the cut portion of the first web 16.

[0048] The web switching device 10 of the present disclosure is configured as described above, and is a web switching device that keeps the joints and cut portions of the web in good condition and can switch webs without adversely affecting the processes after switching.

[0049] Second Embodiment As shown in FIG. 9, the web switching device 40 in the second embodiment is similar to that in the first embodiment, except that the first web contacting means 41 includes fixing means 42 for fixing the first web 16 in contact therewith. Fixing the contacted first web 16 means that when the first web contact means 41 moves while in contact with the first web 16, the first web contact means 41 can move along with the first web 16 while maintaining contact with the first web 16.

[0050] As the fastening means 42, various means can be used without limitation as long as the first web 16 that comes into contact with the first-web contacting means 41 can be fastened. It is preferable to select a means for fastening the first web 16 appropriately depending on the type of web. Specific examples of the fixing means 42 include suction means, adhesive means, etc. Examples of adhesive means include physical adhesive means, electrical adhesive means, magnetic adhesive means, etc.

[0051] Because the first-web contacting means 41 contacts the other surface 24 of the first web in the width direction of the web, the fastening means 42 is preferably provided on the portion of the first-web contacting means 41 that contacts the other surface 24 of the first web, that is, on the entire long side. For example, even if the first-web contacting means 41 has a convex curved long side on the surface that contacts the other surface 24 of the first web, the first web 16 contacts the entire convex curved surface, so it is also preferable to provide the fastening means 42 on the entire curved surface. This allows the first web 16 to be stably fixed across the entire width direction without causing wrinkles, etc. Therefore, even when the first-web contact means 41 moves the first web 16, the first web 16 can be moved while maintaining stable fixation.

[0052] In this embodiment, the fixing means 42 is preferably a suction means. The first-web contact means 41 is configured to be able to fix the first web 16 by sucking the first web 16 at the portion that contacts the first web 16. Because the first-web contact means 41 contacts the other surface 24 of the first web in the web width direction, the suction means 42 is preferably provided at the portion of the first-web contact means 41 that contacts the other surface 24 of the first web, over the entire long side.

[0053] It is preferable that the first-web contact means 41 moves in a direction intersecting the surface of the first web 16 while fixing the first web 16 when the cutting blade 13 cuts the first web 16. The direction intersecting the surface of the first web 16 may be, for example, vertically upward. As shown in FIG. 10, the first web contact means 41 moves in a direction intersecting the surface of the first web 16, thereby lifting up the first web 16 fixed by the fixing means . This allows the first web contact means 41 to control the first web 16 to be in a lifted state.

[0054] When the cutting blade 13 cuts the first web 16, if the first web 16 is controlled to be lifted, the movement of at least one of the cutting blade 13 and the first web contact means 41 makes it easier to properly cut the first web 16. As shown in Figure 11, in a web switching system 300 including a web switching device 40, when the first web 16 is controlled to be lifted, for example, by moving the cutting blade 13 in a direction away from the new raw roll 17, the first web 16 hits the blade portion 25 at an acute angle, making it easy to cut the first web 16 and preventing damage to the new raw roll 17.

[0055] By controlling the first web 16 to be in a lifted state by the first web contact means 41, the first web 16 and the blade portion 25 are pressed together at a sharper angle without moving the cutting blade 13. Therefore, proper cutting can be more easily performed starting from the blade portion 25. When the cutting blade 13 moves in a direction in which the blade portion 25 is tilted toward the upstream side in the conveying direction (see FIG. 10), there is no risk of damaging the second web, and proper cutting can be more easily performed.

[0056] As described above, the web switching device 40 in the second embodiment is provided with a fixing means 42 that fixes the first web 16 that has come into contact with the first web contact means 41, making it easier to properly cut the first web 16.

[0057] <Third embodiment> As shown in FIG. 12, the web switching device 50 in the third embodiment is the same as that in the first embodiment, except that the pressure joining means 51 is a rotating body that rotates on an axis extending in the width direction, and the first web contact means 52 is a rotating body that rotates on an axis extending in the width direction. Since the pressure joining means 51 and the first web contact means 52 are rotating bodies that rotate on axes extending in the width direction, when the first web 16 is being transported, the pressure joining means 51 and the first web contact means 52 rotate based on the transport of the first web 16. Thus, the pressure joining means 51 and the first web contact means 52 can press, contact, etc. the first web 16 while rotating based on the transport of the first web 16. This allows the web to be switched at the same speed as the web transport speed.

[0058] The rotating body that is the pressure joining means 51 may be any rotating body that can join the first and second webs by pressing the first web in the width direction of the webs while rotating based on the transport of the first web 16 and bringing one surface of the tip of the second web into contact with one surface of the first web and overlapping them, and may be cylindrical in shape. The pressure joining means 51 can be selected, for example, depending on the type of web, and specifically may be a cylindrical rubber roller extending in the width direction.

[0059] The rotating body that is the first-web contact means 52 may be any rotating body that can come into contact with the other surface 24 of the first web in the width direction while rotating based on the transport of the first web 16, and may be cylindrical in shape. The first-web contact means 52 can be selected, for example, depending on the type of web, and specifically may be in the shape of a drum extending in the width direction.

[0060] The first-web contacting means 52 is preferably a rotating body and includes a fixing means for fixing the first web 16 that comes into contact with it. In this case, the first-web contacting means 41 preferably includes a fixing means for fixing the first web 16 over the entire area where the rotating body contacts the first web 16. Specifically, such first-web contacting means 52 can be a suction drum 53 extending in the width direction. The suction drum 53 is a device that has a number of through-holes on the drum surface and can create a negative pressure around the through-holes by suction from the drum shaft, thereby suction-holding the material on its surface. When the first web contact means 52 is a suction drum 53, it can rotate based on the transport of the first web 16 while suction-holding the first web 16 on the drum surface.

[0061] The pressure joining means 51 is means for joining the first web 16 and the second web 18 by pressing the first web 16 in the web width direction while the first web 16 rotates due to the conveyance of the first web 16 and one surface 21 of the first web 16 comes into contact with and overlaps the first web 16. Therefore, the pressure joining means 51 preferably has a control mechanism for controlling the timing of pressing so that the first web 16 can be pressed in the web width direction while the first web 16 is being conveyed when one surface 19 of the tip end 20 of the second web 18 comes into contact with one surface 21 of the first web 16 and overlaps the first web 16. In this case, since the first web 16 is being transported, it is preferable that the first web contact means 52 and the cutting blade 13 contact the first web 16 and the cutting blade 13 cut the first web 16 immediately after the pressure joining means 51 presses the first web 16 in the width direction of the web.

[0062] As shown in FIG. 13, in the web switching device 50, the suction drum 53, which is a pressing and joining means, and the first web contact means 52 are rotating bodies that rotate on axes extending in the width direction. Therefore, even when the first web 16 and the second web 18 are being transported, the suction drum 53 and the first web contact means 52 can perform their functions while rotating in accordance with the transport of the first web 16.

[0063] As described above, the web switching device 50 in the third embodiment is configured such that the pressure joining means 51 and the first-web contact means 52 are rotating bodies that rotate on shafts extending in the width direction, and therefore the web can be automatically switched during transport. Therefore, there is no need to stop the web transport process, and the first web 16 can be cut efficiently and appropriately.

[0064] <Web switching method> Next, an example of a web switching method according to the present disclosure will be described with reference to the drawings. The web switching method disclosed herein is a web switching method for switching a web whose length direction is the conveying direction from a first web to a second web by joining the first web and the second web, and includes the steps of joining the first web and the second web while one surface of the tip of the second web is in contact with one surface of the first web and the two webs are overlapped (hereinafter referred to as the "joining step"); bringing the other surface of the first web into contact with a first web contact means in the width direction (hereinafter referred to as the "contacting step"); and cutting the first web with a cutting blade (hereinafter referred to as the "cutting step"). The step of cutting the first web is performed by moving at least one of the first web contact means and the cutting blade (see Figure 2).

[0065] The joining process is a process in which the pressure joining means 11 joins the first web 16 and the second web 18 by pressing the first web 16 in the width direction of the web while the tip of one surface of the second web is in contact with and overlaps one surface of the first web (see Figure 3). In the joining step, the leading end of one surface of the second web and one surface of the first web, which face each other, are joined together.

[0066] After the joining step, a contacting step is performed. The contacting step is a step in which the first-web contacting means 12 comes into contact with the other surface 24 of the first web in the width direction (see FIG. 4). In the contacting step, the state of the first web is controlled by the first-web contacting means 12. The state of the first web refers to the state of the first web that can be caused by the first-web contacting means 12 pressing the other surface 24 of the first web, such as smoothing out wrinkles in the first web or tensioning the first web 16.

[0067] After the contacting step, a cutting step is performed. The cutting process is a process in which the cutting blade 13 cuts the first web 16 by moving at least one of the first web contact means 12 and the cutting blade 13 having a blade portion whose length in the width direction is greater than or equal to the width of the first web (see Figure 6). In the contacting step, the first web 16 is controlled to be in a state where wrinkles are smoothed out, tension is maintained, etc., so that in the cutting step, the first web 16 can be cut easily and appropriately. Therefore, in the cutting step, the first web 16 can be cut well in the vicinity of the joint between the first web 16 and the second web 18, and it is possible to almost completely eliminate waste portions 27 generated from the first web 16 after cutting.

[0068] As described above, the web switching method disclosed herein is a method that keeps the joining and cutting portions of the web in good condition through the joining process, contacting process, and cutting process, and allows the web to be switched without adversely affecting the processes after switching.

[0069] The contacting step preferably includes the first-web contacting means 41 fixing the first web 16 by the fixing means 42 of the first-web contacting means 41 (see FIG. 9). In this case, the contacting step is a step in which the first-web contacting means 41 fixes the first web 16 while contacting the other surface 24 of the first web 16 in the width direction. This makes it easier to properly cut the first web 16.

[0070] The fixing means 42 is preferably a suction means. In this case, the contacting step is a step in which the first-web contacting means 41 fixes the first web 16 by suction while contacting the other surface 24 of the first web in the width direction (see FIG. 9). This makes it possible to adjust the suction force according to the type of web, control the fastening and release of the fastening, and fasten the first web 16 with a more appropriate fastening force.

[0071] It is preferable that the cutting process includes cutting the first web 16 by at least one of the first web contact means 41 moving in a direction intersecting the surface of the first web 16 while fixing the first web 16, and the cutting blade 13 moving toward the surface of the first web 16 (see Figure 10). The cutting step may be a step in which the first web contact means 41 moves in a direction intersecting the surface of the first web 16 while fixing the first web 16, thereby cutting the first web 16, or a step in which the cutting blade 13 moves toward the surface of the first web 16, thereby cutting the first web 16. Alternatively, the cutting step may be a step in which the first web contact means 41 moves in a direction intersecting the surface of the first web 16 while fixing the first web 16, and the cutting blade 13 moves toward the surface of the first web 16, thereby cutting the first web 16.

[0072] Preferably, the cutting process includes the first web contact means 41 moving in a direction intersecting the surface of the first web while fixing the first web, and then the cutting blade 13 moving toward the surface of the first web 16 to cut the first web 16 (see Figure 11). [Example]

[0073] The present disclosure will be described in further detail below based on examples. The materials, amounts used, ratios, processing details, processing procedures, etc. shown in the following examples can be changed as appropriate without departing from the spirit of the present disclosure. Therefore, the scope of the present disclosure should not be construed as being limited by the following examples.

[0074] (Example) The raw metal foil was switched using a web switching system 300 (see FIG. 11). The raw metal foil was a roll of aluminum metal foil with a length of 5000 m, a width of 1500 mm, and a thickness of 15 μm, and a diameter of 500 mm. Adhesive tape was previously applied to the leading end 20 of one surface 19 of the second web 18 to be wound around the new web 17. The adhesive tape used was double-sided tape (Kikusui Tape Co., Ltd., Kikusui Double Tape No. 192T). The first web contact means 41 was provided with a suction means. Based on the web switching method of the present disclosure, the following steps are performed: a joining process in which the pressure joining means 11 presses the first web 16 in the width direction of the web while the tip of one surface of the second web is in contact with and overlaps one surface 21 of the first web, thereby joining the first web 16 and the second web 18; a contact process in which the first web contact means 41 contacts the other surface 24 of the first web; and a lifting process in which the first web contact means 41 lifts the first web 16 while fixing it by suction. After this, a cutting process is performed in which the cutting blade 13 is moved in a direction away from the new original roll 17 to cut the first web 16. The changeover was carried out without any problems, and no problems occurred in the subsequent processes. Observation of the cut portion of the first web and the joint between the first and second webs revealed that the length of the unnecessary portion 27 in the longitudinal direction of the webs was 20 mm from the joint. There were no problems with the cut portion, and the cutting was excellent.

[0075] (Comparative Example) The raw metal foil was switched using a web switching system 100 (see FIG. 1). The same metal foil as in Example 1 was used. An attachment tape was attached in advance to the leading end of one surface of the second web to be wound around the new raw roll in the same manner as in Example 1. The attachment tape used was a double-sided tape (Kikusui Tape Co., Ltd., Kiku Double Tape No. 192T). By rotating operating shaft 111 equipped with old workpiece 103 and new workpiece 101, one surface of web 104 of old workpiece 103 and the surface of the leading end of web 102 of new workpiece 101 were attached with adhesive tape or the like placed on the surface of the leading end of web 102 of new workpiece 101. Thereafter, while pressing joint 106 where the webs of new workpiece 101 and old workpiece 103 were attached with a pressure roller, web 104 of old workpiece 103 was pierced at the cutting portion with saw blade 108 having the length of the width of the old workpiece, thereby cutting web 104 of old workpiece 103. Although the changeover was successful, the web was cut in the subsequent process due to the inclusion of the unwanted portion 27. Observation of the cut portion of the first web and the joint between the first and second webs revealed that the length of the unnecessary portion 27 in the longitudinal direction of the web was 250 mm from the joint. Observation of the cut portion revealed that tears had occurred in the unnecessary portion 27 and wrinkles had occurred at the joint.

[0076] In Example 1 relating to the web joining device and web joining method of the present disclosure, the web was joined automatically, the joining points and cut sections of the web were in good condition, and the web could be switched without adversely affecting the process after the switch. [Explanation of symbols]

[0077] 10, 40, 50 web switching device 11, 51 Pressurized joining means 12, 41, 52 Web contact means 13 Cutting blade 14 Retaining member 15, 103 Old original roll 16 First Web 17, 101 New original rolls 18 Second Web 19 One surface of the second web 20 Tip of second web 21 One surface of the first web 22 Joint material 23 Control device 24 Other surface of first web 25 Blade 26 Joints 27 Unnecessary part 31 Yamabe 32 Valley 42 Fixing means 42 Suction means 53 Suction drum 100, 200, 300 Web Switching System 102 New Raw Material Web 104 Web 105 Web tip 106 Joint 107 Pressing roller 108 saw blade 109 Cutting line 110 Unnecessary part 111 Moving axis a Vertex b Valley bottom d Conveying direction e direction x Longitudinal direction

Claims

1. A web switching device that switches a web from a first web to a second web by joining the first web and the second web, a pressure joining means for joining the first web and the second web by pressing the first web while one surface of the tip end of the second web and one surface of the first web are in contact with each other and overlapped with each other; a first web contact means arranged in a row with the pressure joining means in the transport direction of the first web, contacting the other surface of the first web in the width direction of the first web, and configured to be movable in at least a direction intersecting the surface of the first web; a cutting blade having a blade portion having a length equal to or greater than the width of the first web in the width direction, the cutting blade being disposed between the first web contact means and the pressure joining means; Equipped with A web switching device, wherein the cutting blade cuts the first web by movement of at least one of the first web contact means and the cutting blade.

2. 2. The web switching device according to claim 1, wherein the first web contacting means has a curved surface that is convex across the width direction on a surface that contacts the other surface of the first web.

3. 2. The web switching device according to claim 1, wherein the first web contacting means comprises fixing means for fixing the first web in contact therewith.

4. 4. The web switching device according to claim 3, wherein the fixing means is a suction means.

5. The web switching device according to claim 1 , wherein the blade portion has a shape having a plurality of peaks and a plurality of valleys alternating in the longitudinal direction.

6. 2. The web switching device according to claim 1, wherein the web is a metal foil or a resin film having a thickness of 100 [mu]m or less.

7. A web switching method for switching a web from a first web to a second web by joining the first web and the second web, comprising: a step of joining the first web and the second web in a state where one surface of the tip end portion of the second web and one surface of the first web are in contact with each other and overlapped with each other; bringing the other surface of the first web into contact with a first web contact means in the width direction of the first web; cutting the first web with a cutting blade, The web switching method, wherein the step of cutting the first web is performed by moving at least one of the first web contact means and the cutting blade.

8. 8. The web switching method according to claim 7, wherein the step of bringing the other surface of the first web into contact with the first web contacting means includes fixing the first web with fixing means provided on the first web contacting means.

9. 9. The web switching method according to claim 8, wherein the fixing means is a suction means.

10. 9. The web switching method according to claim 8, further comprising cutting the first web by at least one of: moving the first web contact means in a direction intersecting the surface of the first web while fixing the first web; and moving the cutting blade toward the surface of the first web.

11. 9. The web switching method according to claim 8, wherein the step of cutting the first web includes moving the first-web contact means in a direction intersecting the surface of the first web while fixing the first web, and then moving the cutting blade toward the surface of the first web.

12. 8. The web switching method according to claim 7, wherein the web is a metal foil or a resin film having a thickness of 100 μm or less.

Images