Manufacturing method for sanitary paper roll

Abstract

To provide a manufacturing method for sanitary paper roll capable of reducing the possibility for polishing powders to be adhered to the product.SOLUTION: A manufacturing method for sanitary paper roll 3 includes: a cutting step for cutting each of a plurality of paper logs 5 of a sanitary paper roll 3 being conveyed into a prescribed product width while rotating cutting blades 31; and a polishing / non-polishing step which polishes the cutting blades 31 at first timing T1 at which the cutting blades 31 rotate to cut the paper log 5, and does not polish the cutting blades 31 at second timing T2 at which frequency of the cutting blades' not contacting or contacting the paper log decreases.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a method for producing rolled sanitary paper, which includes a step of sharpening a cutting blade. [Background technology]

[0002] Conventionally, rolled sanitary paper (hereinafter simply referred to as "rolled sanitary paper"), which is sanitary paper such as toilet paper, kitchen paper, paper towels, and paper wipes (hereinafter simply referred to as "sanitary paper") wound into a roll, is obtained by cutting a paper log to the product width.However, the cutting edge of the cutting blade that cuts the paper log needs to be consistent in product width for the multiple rolled sanitary paper being cut, and the cut edges are polished with a polishing device to make them clean.

[0003] For example, Patent Document 1 describes that a cutting blade that cuts a log of web material while rotating is ground. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 2017-534468 Summary of the Invention [Problem to be solved by the invention]

[0005] When a cutting blade is sharpened, the abrasive dust (such as grinding stone dust) that is generated during this process adheres to the cutting blade. While the paper logs are being cut continuously, the cutting edge of the cutting blade comes into contact with the paper logs, so the abrasive dust that has adhered to the cutting blade's cutting edge is removed. However, when cutting multiple paper logs to the product width, if the cutting is repeated during the period when no paper logs are being cut (hereinafter also referred to as the paper log replacement period) or while the cutting blade is stopped, the cutting edge of the cutting blade will not come into contact with the paper logs, so abrasive dust will accumulate on the cutting blade's cutting edge, increasing the possibility of the abrasive dust adhering to the product.

[0006] The invention described in Patent Document 1 does not take this point into sufficient consideration, and there is still room for improvement in the manufacturing process of rolled sanitary paper to reduce the possibility of abrasive powder adhering to the product.

[0007] An object of the present invention is to provide a method for producing rolled sanitary paper that reduces the possibility of abrasive powder adhering to the product. [Means for solving the problem]

[0008] A first aspect of the method according to the present invention is a method for manufacturing rolled sanitary paper, which includes a cutting step in which a cutting blade is rotated to cut each of the multiple paper logs of the rolled sanitary paper being transported into a predetermined product width, and a grinding / non-grinding step in which the cutting blade is sharpened at a first timing when the cutting blade is rotating and cutting the paper logs, and is not sharpened at a second timing when the cutting blade is not in contact with the paper logs or when the frequency of contact with the paper logs is reduced.

[0009] A second aspect of the method according to the present invention is the method described in the first aspect, characterized in that the second timing is a timing when the cutting blade is rotating idly between adjacent paper logs.

[0010] A third aspect of the method according to the present invention is the method described in the first aspect, characterized in that the second timing is a timing when the cutting blade is stopped.

[0011] A fourth aspect of the method according to the present invention is the method described in the first aspect, characterized in that the first timing is a predetermined grinding timing when the cutting blade rotates and continuously cuts the paper log at a constant speed, and the second timing is a timing when the support arm of the cutting blade decreases or increases the rotation speed. [Effects of the Invention]

[0012] According to the present invention, the cutting blade is sharpened at a first timing when the cutting blade is rotating and cutting the paper log, and is not sharpened at a second timing when the cutting blade is not in contact with the paper log or when the frequency of contact decreases.This makes it less likely for abrasive powder to accumulate on the cutting edge of the cutting blade, thereby reducing the possibility of abrasive powder adhering to the rolled sanitary paper product. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a schematic perspective view of a production line in which a production method according to an embodiment of the present invention is carried out; [Figure 2] 1 is a block diagram of a manufacturing apparatus for carrying out a manufacturing method according to an embodiment of the present invention. [Figure 3] FIG. 2 is a schematic diagram illustrating a cutting step and a polishing / non-polishing step according to one embodiment of the present invention. [Figure 4] 1 is a flow chart showing a polishing and non-polishing process according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] An embodiment of the method for producing rolled sanitary paper according to the present invention will be described in detail with reference to Figures 1 to 4. However, the present invention is not limited to this embodiment.

[0015] In this specification and claims, "rolled sanitary paper" refers to sanitary paper rolled into a roll, as described above, and "sanitary paper" refers to toilet paper, kitchen paper, paper towels, paper wipes, etc.

[0016] <Production line> Fig. 1 is a schematic perspective view of a production line (production apparatus) 1 in which a production method according to one embodiment of the present invention is performed, Fig. 2 is a block diagram of the production apparatus 1 in which the production method according to this embodiment is performed, and Fig. 3 is a schematic view illustrating a cutting process and polishing / non-polishing processes according to this embodiment. The configurations shown in Figs. 1 to 3 and Fig. 4 described later are one example according to the present invention, and the present invention is not limited to these configurations.

[0017] As shown in FIG. 1, a production line 1 for rolled sanitary paper according to this embodiment produces rolled sanitary paper (toilet paper in this embodiment) 3, which is sanitary paper (toilet paper in this embodiment) wound into a roll.

[0018] The production line 1 is provided with a paper log generating unit 10 that forms roll-shaped paper logs 5 that are axially longer than the roll-shaped sanitary paper 3; an adjustment unit 20 that temporarily stores the paper logs 5 formed by the paper log generating unit 10 and adjusts the timing of the paper log 5's delivery; and a cutting unit (cutting device) 30 that cuts the paper logs 5 delivered from the adjustment unit 20 to predetermined dimensions to produce multiple roll-shaped sanitary paper 3. In this embodiment, the cutting unit 30 is provided with a grinding / non-grinding unit (grinding device) 300 that sharpens the cutting blade 31 at a first time T1 when the cutting blade 31 rotates and cuts the paper log 5, and does not sharpen the cutting blade 31 at a second time T2 when the cutting blade 31 does not contact the paper log 5. The production line 1 is also provided with a packaging unit 40 that packages the roll-shaped sanitary paper 3 cut by the cutting unit 30 in predetermined numbers, and a boxing unit 50 that boxes the packages 9 of roll-shaped sanitary paper 3 packaged by the packaging unit 40.

[0019] Hereinafter, upstream and downstream are defined based on the order of processes performed by each section on the production line 1. On the production line 1, a paper log generating section 10, an adjusting section 20, a cutting section 30 (including a polishing / non-polishing section 300), a packaging section 40, and a boxing section 50 are arranged in this order from upstream to downstream.

[0020] The paper log producing unit 10 unwinds the base paper 11 (material) from a raw roll 12, which is a strip of base paper 11 that is wider than the rolled sanitary paper 3, and rewinds the base paper 11 with a winder 13 to form a paper log 5. The paper log 5 has an axial length equal to the axial length of the raw roll 12 and a diameter equal to the diameter of the product 3.

[0021] In the winder 13, the base paper 11 may be embossed or printed. The base paper roll 12 may be a primary base paper (jumbo roll) on which a single layer (one ply) of base paper 11 made of one sheet of paper material is wound, or a secondary base paper on which multi-layer (two or more plies) base paper 11 made of multiple sheets of paper material is wound.

[0022] The winder 13 cuts the base paper 11 every time it is wound around a cylindrical core 5c (long core tube) by a predetermined length, thereby continuously forming paper logs 5. The base paper 11 is wound from the inner periphery (core 5c side) of the paper log 5 toward the outer periphery (i.e., from the inside to the outside in the radial direction). Then, once a predetermined length of base paper 11 has been wound around the outer periphery of the core 5c, the base paper 11 is cut (divided) along a straight line intersecting the longitudinal direction of the base paper 11, thereby forming the paper log 5. Here, an example is shown in which the base paper 11 is cut along a straight line extending in its width direction (a direction perpendicular to the longitudinal direction).

[0023] As described above, of the base paper 11 that forms the continuous paper log 5, the portion downstream of the straight line becomes the winding end 5a (tail) of one paper log 5, and the portion upstream of the straight line (the portion separated from the winding end 5a) becomes the winding start end of the next log 5.

[0024] As shown in FIG. 1, each paper log 5 has its winding end 5a glued (tail sealed) to the outer periphery in the gluing section 14, which is the final process in the paper log producing section 10, and then is sent to the adjusting section 20 downstream.

[0025] The adjusting unit 20 stores a plurality of paper logs 5 in the accumulator 21, and sequentially sends out the paper logs 5 to the downstream cutting unit 30. Here, an adjusting unit 20 that sends out two paper logs 5 at a time toward the cutting unit 30 is illustrated as an example.

[0026] The cutting unit 30 uses a cutting blade 31 to cut the paper log 5 sent out from the adjusting unit 20 at predetermined intervals in the axial direction. This cuts each paper log 5 into a plurality of rolls of sanitary paper 3. In the present invention, for example, one paper log 5 can be cut into 25 (or 20) rolls of sanitary paper 3. In the present invention, the number of cuts is not limited.

[0027] The sharpening / non-sharpening section 300 starts or stops sharpening the cutting edge of the cutting blade 31 based on a control signal from a control device 310, which will be described later. Details of the steps in the sharpening / non-sharpening section 300 will be described later.

[0028] The packaging unit 40 inserts, for example, eight rolls of sanitary paper 3 (four rolls x two rows) into a packing bag 19 and seals the opening 22 of the packing bag 19 to form a package 9.

[0029] The boxing section 50 packs a plurality of (for example, eight) packages 9 as one set into the cardboard box 23. Then, the packages 9 packed in the cardboard box 23 are shipped.

[0030] <Cutting device> The cutting device 30 is equipped with a disk-shaped cutting blade 31 and a sharpening device (sharpening / non-sharpening unit) 300 that sharpens the cutting edge of the cutting blade 31. The cutting device 30 cuts each of the multiple paper logs 5 of the rolled sanitary paper 3 being transported into a predetermined product width while rotating the cutting blade 31.

[0031] 3, the cutting device 30 includes a linear support arm 33 rotatably supported around a rotation axis S1 whose middle portion is connected to a support body 32, and two cutting blades 31 attached to both ends of the support arm 33. As shown in FIG. 3, the cutting blades 31 are arranged so that each side surface (blade surface) of the cutting blade 31 is oriented perpendicular to the center line CL2 of the paper log 5 being conveyed. The paper log 5 is cut while the support arm 33 rotates around the rotation axis S1 and the cutting blade 31 rotates around its central axis CL1, i.e., while the cutting blade 31 revolves (orbits) around the rotation axis S1 and rotates around its central axis CL1.

[0032] Here, two cutting blades 31 are provided, each 180 degrees out of phase with one another, but the shape of the support arms 33 and the number of cutting blades 31 are not limited; for example, three support arms 33 may be extended radially from the rotation axis S1, with a cutting blade 31 attached to each end, for a total of three cutting blades 31.

[0033] In this embodiment, the rotation speed of the two cutting blades 31 of the cutting unit 30 is constant, and the cutting blades 31 are either stationary or only rotating.

[0034] During cutting, the paper log 5 is conveyed along its axial direction and fed into the cutting blade 31, which rotates the cutting blade 31 while the support arm 33 rotates around the rotation axis S1 of the support body 32, cutting into the paper log 5 to cut it. After cutting is complete, the paper log 5 advances axially by the product length, during which time the support arm 33 rotates 180 degrees and the other cutting blade 31 is used to cut into the paper log 5 to cut it. This process is repeated until the cutting of each paper log 5 is completed.

[0035] <Polished / non-polished part> The grinding / non-grinding unit (grinding device) 300 includes a grinder 60 that grinds the cutting edge of the cutting blade 31, and a control device 310 that starts and stops the grinder 60. In this embodiment, the grinding device 300 is provided for both of the two cutting blades 31, but for ease of explanation, FIG. 3 shows the state in which it is provided for only one of the cutting blades 31.

[0036] A support member 53 is further attached to the end of the support arm 33, and a bracket (support member) is attached to the support member 53.

[0037] As shown in Fig. 3, the grinder 60 includes a first grindstone that grinds one side (the front side in Fig. 3) of the cutting edge of the cutting blade 31, and a second grindstone that grinds the other side (the back side in Fig. 3) of the cutting edge of the cutting blade 31, and both grindstones are supported by a stay that is movably attached to the bracket. The grindstone comes into contact with the cutting edge of the cutting blade 31 as the stay moves, and grinds the cutting edge while rotating in response.

[0038] Each stay is configured to be moved by an actuator (not shown) between a state in which the grindstone contacts the cutting edge of the cutting blade 31 and a state in which the grindstone is separated from the cutting edge of the cutting blade 31. In this embodiment, each stay moves the grindstone into contact with the cutting edge of the cutting blade 31 to sharpen the cutting edge, or moves the grindstone away from the cutting edge to stop sharpening the cutting edge, based on a control signal from the control device 310. The present invention is not limited to this configuration, and other configurations for starting and stopping sharpening of the cutting edge of the cutting blade 31 may also be employed.

[0039] The cutting edge of the cutting blade 31 wears and becomes dull as it cuts the paper log 5, but as described above, the grinder 60 operates at a predetermined timing to sharpen the cutting edge of the cutting blade 31, preventing the cutting edge from becoming dull and maintaining good sharpness. This makes it possible to smooth the cut surface formed when the paper log 5 is cut, ensuring good product quality of the toilet roll 3.

[0040] 3, the control device 310 includes a grinding device control unit 311 that controls the start and stop of grinding the cutting edge of the cutting blade 31 in the grinding device 300, and a log contact determination unit 312 that determines whether the cutting blade 31 is in contact with the paper log 5. In the present invention, the log contact determination unit 312 may be provided in a control device (or device control unit) different from the control device 310, rather than in the control device 310.

[0041] FIG. 4 is a flow chart of polishing and non-polishing steps according to one embodiment of the present invention.

[0042] The grinder control unit 311 instructs the grinder 300 to start grinding the cutting blade 31 (step S1), and the log contact determination unit 312 determines whether it is the first time T1 at which the cutting blade 31 will come into contact with the paper log 5 (step S2). If the log contact determination unit 312 determines that it is not the first time T1 at which the cutting blade 31 will come into contact with the paper log 5 (i.e., if it determines that it is the second time T2 at which the cutting blade 31 will not come into contact with the paper log 5), the grinder control unit 311 instructs the grinder 300 to stop grinding the cutting blade 31 (step S3). If the log contact determination unit 312 determines that it is the first time T1 at which the cutting blade 31 will come into contact with the paper log 5, step S2 is repeated (e.g., at predetermined intervals). After step S3, for example, if the log contact determination unit 312 determines that it is the first time T1 at which the cutting blade 31 comes into contact with the paper log 5, the process returns to step S1, and the sharpening device control unit 311 instructs the sharpening device 300 to start sharpening the cutting blade 31. In the present invention, sharpening may be performed continuously or intermittently at the first time T1.

[0043] Regarding log contact determination, the timing at which the cutting blade 31 contacts the paper log 5 can be detected, for example, by detecting the axial position of the paper log 5 relative to the cutting blade 31 or the number of cuts made by the cutting blade 31 on one paper log 5 using a well-known sensor.

[0044] In this embodiment, the second timing T2 is a timing when the cutting blade 31 located between adjacent paper logs 5 is rotating idly (i.e., during a paper log replacement period) or a timing when the cutting blade 31 is stopped. The timing when the cutting blade 31 is stopped is, for example, a timing when the cutting blade 31 of the cutting device 30 receives a stop signal. In this embodiment, stopping the cutting blade 31 may include not only stopping the rotation of the cutting blade 31 but also stopping the rotation of the support arm 33.

[0045] In this embodiment, the above steps S1 to S3 are performed in a grinding device 300 provided for each of the two cutting blades.

[0046] Furthermore, in this embodiment, the control device 310 is included in the polishing device 300, but in the present invention, it may be incorporated into the device 1 for producing rolled sanitary paper 3 other than the polishing device 300.

[0047] In a variation of this embodiment, the grinding device 300 may include a brush to remove grinding powder adhering to the side of the cutting blade.

[0048] The brushes may be disposed adjacent to the grinder 60 on the downstream side in the rotation direction of the cutting blade 31. The brushes may include, for example, a first brush that cleans one side of the blade surface including the cutting edge of the cutting blade 31, and a second brush that cleans the other side of the blade surface including the cutting edge of the cutting blade 31. The first brush may be fixed directly to the bracket, and the second brush may be fixed to an auxiliary bracket that is fixed to the bracket by bolting or the like.

[0049] Conventionally, rolled sanitary paper is obtained by cutting paper logs to the product width. However, the cutting edge of the cutting blade used to cut the paper logs must be consistent across the product width of the multiple rolled sanitary paper rolls being cut, and the edges are polished with a polishing device to ensure a clean cut.

[0050] For example, Patent Document 1 describes that a cutting blade that cuts a log of web material while rotating is ground.

[0051] When a cutting blade is sharpened, the generated abrasive powder (such as grinding stone powder) adheres to the cutting blade. While the paper logs are being continuously cut, the cutting edge of the cutting blade comes into contact with the paper logs, so the abrasive powder adhering to the cutting blade's cutting edge is removed. However, when cutting multiple paper logs to the product width, if the cutting is repeated during the paper log replacement period or while the cutting blade is stopped, the cutting edge of the cutting blade does not come into contact with the paper logs, so abrasive powder accumulates on the cutting blade's cutting edge, increasing the possibility of the abrasive powder adhering to the product.

[0052] Furthermore, in view of the fact that abrasive powder generated when the cutting blade is sharpened adheres to the side of the cutting blade, even if a brush is provided on the sharpening device to periodically remove the abrasive powder from the side of the cutting blade, if sharpening is repeated during the paper log replacement period or while the cutting blade is stopped, this will lead to excessive sharpening of the cutting blade, causing more abrasive powder to accumulate on the brush than necessary, thereby reducing the brush's ability to remove abrasive powder and increasing the possibility of abrasive powder adhering to the product.

[0053] According to this embodiment, the cutting blade 31 is sharpened at the first timing T1 when the cutting blade 31 is rotating and cutting the paper log 5, and is not sharpened at the second timing T2 when the cutting blade 31 is not in contact with the paper log 5. This makes it difficult for abrasive powder to accumulate on the cutting edge of the cutting blade 31, thereby reducing the possibility of abrasive powder adhering to the rolled sanitary paper 3 that is the product.

[0054] Furthermore, according to this embodiment, if a brush is provided to remove abrasive powder adhering to the side of the cutting blade 31, abrasive powder is less likely to accumulate on the brush, and the brush's abrasive powder removal function is maintained, thereby reducing the possibility of abrasive powder adhering to the rolled sanitary paper 3, which is the product.

[0055] <Modification> In the above-described embodiment, as one example of the second timing, the flow of stopping sharpening of the cutting blade 31 during the paper log replacement period or when the cutting blade 31 is stopped is described. However, another example of the second timing will be described below as a modified example.

[0056] When the cutting blade is sharpened, the abrasive dust (such as grinding stone dust) that is generated during the process adheres to the cutting blade. When paper logs are continuously cut at a constant speed (a speed that can be set arbitrarily depending on the type: so-called high speed), the cutting edge of the cutting blade comes into contact with the paper log, so the abrasive dust that has adhered to the cutting edge of the cutting blade is removed. However, depending on the operating conditions, there may be times when cutting of the paper logs must be interrupted.

[0057] When cutting a paper log is interrupted or resumed, the rotation speed of the cutting blade support arm must be decreased or increased, but when the preset sharpening timing (the number of times the paper log has been cut: hereinafter also referred to as the number of sharpening cuts) is reached, the cutting blade is sharpened for the preset sharpening period (hereinafter also referred to as the sharpening time), and at the same time as sharpening is completed, the number of sharpening cuts is reset, and the counting resumes and is repeated.

[0058] Grinding occurs regardless of the rotation speed of the cutting blade support arm. For example, even when a stop signal is sent to the cutting section and the rotation of the support arm slows down and it is about to stop, grinding will occur when the grinding cut number is reached. Therefore, the cutting edge of the cutting blade, which is rotating at high speed, will slowly cut the paper log, and abrasive dust will concentrate and adhere to the roll of sanitary paper that is cut first when grinding begins.

[0059] In a modified example of this embodiment, the first timing mentioned above is a predetermined grinding timing at which the cutting blade 31 rotates and continuously cuts the paper log 5 at a constant speed, and the second timing mentioned above is a timing at which the support arm 33 of the cutting blade 31 decreases or increases the rotation speed.

[0060] According to this configuration, the cutting blade 31 is not sharpened at the sharpening timing after a stop signal or an operation signal is received by the device control unit 301 of the cutting unit 30, so that abrasive dust is less likely to accumulate on the cutting edge of the cutting blade 31, thereby reducing the possibility of it adhering to the rolled sanitary paper 3 product.

[0061] In this modified example, the second timing can also be said to be the timing at which the frequency with which the cutting blade 31 comes into contact with the paper log 5 decreases.

[0062] The rotation speed of the support arm 33 equipped with the two cutting blades 31 can be arbitrarily adjusted by a setting machine 331, and the number of grinding cuts of the grinder 60 that grinds the two cutting blades 31 can be arbitrarily adjusted by a setting machine 61. In addition, the grinding time of the grinder 60 that grinds the two cutting blades 31 can be arbitrarily adjusted by the setting machine 61.

[0063] Here, the "constant speed" and "predetermined grinding timing" for continuously cutting the cut portion 30 when, for example, one-ply (single-ply) paper logs 5 are lined up in four rows (two rows are shown in Figures 1 and 3 of this embodiment for ease of explanation) means that the support arm 33 rotates at 80 cuts per minute, the cutting blade 31 cuts the paper logs 5 25 times, and the grinder 60 grinds the cutting blade 31 for 2.0 seconds.

[0064] For example, in the case of a two-ply product (two layers), the "constant speed" and "predetermined grinding timing" mean that the support arm 33 rotates at 100 cuts per minute, the cutting blade 31 cuts the paper log 5 20 times, and the grinder 60 grinds the cutting blade 31 for 1.5 seconds. The two settings given above as examples can be set by the setting machine 331 and the setting machine 61, as described above, but the present invention is not limited to the settings for the one-ply and two-ply cases.

[0065] Basically, starting and stopping the cutting unit 30 is operated manually, but once it is in automatic operation, when a decrease in the number of paper logs 5 in the upstream accumulator 21 is detected, a control signal is sent from the control device 211 of the accumulator 21, or when a congestion of rolled sanitary paper 3 is detected in the conveying unit (conveyor) 340 that supplies the rolled sanitary paper 3 to the packaging unit 40 due to a stop of the packaging unit 40 that forms the packages 9 downstream (this may not be limited to manual stoppage of the packaging unit 40 or a trouble in the packaging unit 40, but may also be accompanied by a stoppage due to a trouble in the boxing unit 50 that packs the packages 9 further downstream), a control signal is sent from the device control unit 341 of the conveying unit 340 to the device control unit 301 of the cutting unit 30, stopping the rotation of the support arm 33 and the two cutting blades 31 equipped at both ends of it.

[0066] The cutting unit 30 stops cutting the paper log 5 in response to a stop signal from the control device 211 of the accumulator 21 and the device control unit 341 of the conveying unit 340, but the equipment that makes up the cutting unit 30 stops in the following order. (1) Decrease the rotation speed of the support arm 33 (2) The support arm 33 is stopped at a fixed position (for example, if there are two cutting blades 31, the support arm 33 is horizontal, i.e., the cutting blades 31 are not in the cutting position for the paper log 5). (3) Stopping the rotation of the cutting blade 31

[0067] The cutting unit 30 stops automatically and is in a so-called standby state. When the number of paper logs 5 in the accumulator 21 decreases or the congestion of rolled sanitary paper 3 in the conveying unit 340 is resolved, an operation signal is sent from the control device 211 of the accumulator 21 and the device control unit 341 of the conveying unit 340, and the equipment that makes up the cutting unit 30 begins to operate in the reverse order of when it stopped, and cutting of the paper logs 5 resumes.

[0068] In other words, when the cutting speed decreases, the device control unit 301 of the cutting unit 30 receives a stop signal from the control device 211 of the accumulator 21 and the device control unit 341 of the conveying unit 340, and when the cutting speed increases, the device control unit 301 of the cutting unit 30 receives an operation signal from the control device 211 of the accumulator 21 and the device control unit 341 of the conveying unit 340.

[0069] In this modified example, stopping the cutting unit 30 may include not only stopping the rotation of the cutting blade 31 but also stopping the rotation of the support arm 33, as in the above-described embodiment.

[0070] According to this modified example, as described above, the cutting blade 31 is not sharpened at the sharpening timing after a stop signal or an operation signal is received by the device control unit 301 of the cutting unit 30, so that abrasive dust is less likely to accumulate on the cutting edge of the cutting blade 31, thereby reducing the possibility of it adhering to the rolled sanitary paper 3 product.

[0071] It should be noted that not grinding here is not limited to the number of grinding cuts. Non-grinding can be set based on time. When the cutting unit 30 is operating, if a stop signal is received by the device control unit 301 of the cutting unit 30, grinding will not be performed, and if grinding is in progress, it can be canceled. For example, when an operation start signal is received by the device control unit 301 of the cutting unit 30 while the cutting unit 30 is stopped (standby), (1) the setting device 61 can be programmed to grind in 10 cuts, or (2) the grinding timing can be adjusted by the arbitrarily adjustable setting device 61. In either case, grinding is performed based on the number of cuts, but it can also be set based on time.

[0072] <Other> The present invention is not limited to the above-described embodiments or the modifications described throughout, and appropriate changes and modifications can be made without departing from the technical concept of the present invention.

[0073] Each control device according to the above embodiments may include a control unit and a storage unit for storing various data and threshold data generated by the control unit. Each control unit includes a CPU (Central Processing Unit), and the above-mentioned functional units may be executed by the CPU. The storage unit is configured with a storage area such as a ROM (Read Only Memory) or a RAM (Random Access Memory). [Explanation of symbols]

[0074] 1. Sanitary paper roll production line 3. Sanitary paper rolls 5. Paper Log 5a End of winding 5c Core 10 Paper Log Generation Unit 11 Base paper (materials) 12 Raw roll 13 Winder 14 Gluing section 20 Adjustment section 21 Accumulator 30 Cutting section (cutting device) 31 Cutting Blade 33 Support arm 300 Polishing / non-polishing section (polishing equipment) 40 Packaging Department 50 Packing Department

Claims

1. A method for manufacturing rolled sanitary paper, comprising: a cutting step of cutting each of the plurality of paper logs of the rolled sanitary paper being conveyed into a predetermined product width while rotating a cutting blade; a sharpening / non-sharpening step of sharpening the cutting blade at a first timing when the cutting blade is rotating and cutting the paper log, and not sharpening the cutting blade at a second timing when the cutting blade is not in contact with the paper log or when the frequency of contact with the paper log is reduced; A manufacturing method comprising:

2. 2. The manufacturing method according to claim 1, wherein the second timing is a timing when the cutting blade is rotating idly between the adjacent paper logs.

3. The manufacturing method according to claim 1 , wherein the second timing is a timing when the cutting blade is stopped.

4. the first timing is a predetermined grinding timing when the cutting blade rotates and continuously cuts the paper log at a constant speed; 2. The manufacturing method according to claim 1, wherein the second timing is a timing at which the rotation speed of the support arm of the cutting blade is decreased or increased.

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