Emboss unit, sheet manufacturing apparatus, and antifouling method

Abstract

To suppress adhesion of dirt to an outer peripheral surface of a roll caused by printing applied to a sheet in an embossing unit.SOLUTION: An antifouling device 1 of an emboss unit 16 for forming emboss on a sheet 2 by passing the printed sheet 2 between a pair of roll side 6A and side 6B is provided with a storage part side 1A and an oil supply part side 1B. The storage part 1A stores antifouling oil. The oil supply part 1B supplies the oil stored in the storage part 6A to the outer peripheral surface of a target roll 6 which is at least one of the pair of roll 1A and 6B.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an anti-stain device for an embossing unit that forms embossments on a sheet, an embossing unit equipped with this anti-stain device, a sheet manufacturing apparatus equipped with this embossing unit, and an anti-stain method for an embossing unit. [Background technology]

[0002] Conventionally, an embossing unit is known that forms an embossment on a long sheet by passing the sheet between a pair of rolls. For example, Patent Document 1 discloses a technology in a production line for logs that become toilet rolls, in which a chemical solution is applied to a continuous sheet by a printing machine and then an embossment is applied to the continuous sheet by a pair of rolls. In this technology, high-pressure fluid is sprayed onto each roll and a fluid containing waste is sucked, thereby cleaning the waste caused by the chemical solution from each roll and embossing the continuous sheet. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-13433 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the technology of Patent Document 1 cleans each roll with high-pressure fluid after dirt caused by the chemical solution applied to the sheet in the printing press adheres to each roll, so it is not possible to prevent the adhesion of dirt caused by printing to each roll in advance. Therefore, the conventional technology has room for improvement in terms of suppressing the adhesion of dirt to the outer circumferential surface of the roll caused by printing on the sheet.

[0005] The present invention was conceived in consideration of the above-mentioned problems, and one of its objectives is to suppress the adhesion of dirt to the outer circumferential surface of a roll in an embossing unit, which is caused by printing on a sheet. However, other objectives of the present invention are not limited to this objective. The present invention also aims to achieve the effects and advantages derived from the configurations shown in the "Mode for Carrying Out the Invention" described below, which are not obtainable with conventional techniques. [Means for solving the problem]

[0006] The antifouling device of this invention is described in (1) to (7) below. (1) An anti-fouling device for an embossing unit that passes a printed sheet between a pair of rolls to form embosses on the sheet, a storage section for storing antifouling oil; an oil supply unit that supplies the oil stored in the storage unit to the outer peripheral surface of a target roll that is at least one of the pair of rolls. An antifouling device characterized by: (2) The sheet has colored ink transferred thereto by the printing. The antifouling device according to (1) above. (3) The oil supply unit applies the oil stored in the storage unit to the outer peripheral surface of the target roll using a cloth material. The antifouling device according to (1) or (2) above. (4) The oil supply unit sprays the oil stored in the storage unit onto the outer circumferential surface of the target roll. The antifouling device according to any one of (1) to (3) above. (5) A diffusion section is provided which spreads the oil sprayed in the oil supply section onto the outer peripheral surface of the target roll using a brush material. The antifouling device according to (4) above. (6) The target roll includes an embossing roll having irregularities formed on the outer peripheral surface. The antifouling device according to any one of (1) to (5) above. (7) The target roll includes a roll having no irregularities formed on the outer peripheral surface. The antifouling device according to any one of (1) to (6) above.

[0007] The embossing unit of this case is described below in (8). (8) An antifouling device according to any one of (1) to (7), The pair of rolls An embossing unit characterized by the above.

[0008] The sheet manufacturing apparatus of this case is described below in (9). (9) The embossing unit according to (8) is provided on a conveying line along which the long sheet is conveyed; a printing unit that is provided upstream of the embossing unit on the conveying line and that prints on the sheet. A sheet manufacturing apparatus characterized by:

[0009] The antifouling method of this case is described below in (10). (10) 1. A stain-proofing method for an embossing unit, comprising: passing a printed sheet between a pair of rolls to form embosses on the sheet; An oiling step is provided in which oil for antifouling is supplied to the outer peripheral surface of the target roll, which is at least one of the pair of rolls. An antifouling method characterized by the above. [Effects of the Invention]

[0010] According to the present invention, anti-fouling oil is supplied to the outer peripheral surface of the target roll, which is at least one of a pair of rolls in the embossing unit, thereby suppressing the adhesion of dirt to the outer peripheral surface of the roll caused by printing on the sheet. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic perspective view of a production line incorporating a sheet manufacturing apparatus according to an embodiment. [Figure 2] FIG. 2 is a schematic side view of an embossing unit provided in the sheet manufacturing apparatus of FIG. [Figure 3] FIG. 10 is a schematic side view (corresponding to FIG. 2) of an embossing unit to which an antifouling device according to a modified example is applied. [Figure 4] FIG. 10 is a schematic side view (corresponding to FIG. 2) of an embossing unit to which an antifouling device according to another modified example is applied. [Figure 5] 1 is a flow chart of a manufacturing process including an embossing step in which an anti-soiling method is used. [Figure 6] FIG. 10 is a schematic side view showing a printing unit and an embossing unit when a sheet according to one modified example is applied. DETAILED DESCRIPTION OF THE INVENTION

[0012] The following describes embodiments for carrying out the present invention. The embodiments described below are merely examples, and are not intended to exclude various modifications or applications of techniques not explicitly stated herein. The configurations of the following embodiments can be modified in various ways without departing from the spirit of the invention. Furthermore, they can be selected or combined as needed.

[0013] [1. Equipment] [1-1. Overall structure] As shown in Fig. 1, a sheet manufacturing apparatus 15 according to this embodiment is applied to a manufacturing line 4 that manufactures a roll-shaped product 3. Here, the product 3 is exemplified as toilet paper (toilet roll) in which strip-shaped sanitary paper is wound into a roll. However, the product 3 is not particularly limited as long as it is formed from a long sheet 2, and may be, for example, kitchen paper.

[0014] The production line 4 is provided with a log forming part 10 that forms roll-shaped logs 5 that are axially longer than the products 3, an adjusting part 20 that temporarily stores the logs 5 formed in the log forming part 10 and adjusts the timing of sending out the logs 5, and a cutting part 30 that cuts the logs 5 sent out from the adjusting part 20 into a plurality of products 3. The production line 4 is further provided with a packaging part 40 that packages a certain number of the products 3 cut out by the cutting part 30, and a boxing part 50 that boxes the packages 9 of the products 3 packaged by the packaging part 40.

[0015] Hereinafter, upstream and downstream are defined based on the order of each process performed on the production line 4. On the production line 4, a log forming part 10, an adjusting part 20, a cutting part 30, a packaging part 40, and a boxing part 50 are arranged in this order from upstream to downstream.

[0016] The log forming part 10 unwinds the sheet 2 from the raw roll 12 around which the sheet 2 is wound, and rewinds the sheet 2 using a winder 13 to form a log 5. In this embodiment, the sheet 2 is a strip-shaped (long) paper material that is wider than the product 3. The log 5 is a paper material wound into a roll, and 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.

[0017] The sheet 2 may have a single-layer (1-ply) structure made of one sheet of paper material, or may have a multi-layer (2-ply or more) structure made of multiple laminated sheets of paper material. In other words, the raw roll 12 may be a primary raw roll (jumbo roll) around which a single-layer sheet 2 is wound, or a secondary raw roll around which a multi-layer sheet 2 is wound.

[0018] The winder 13 continuously forms logs 5 by cutting the sheet 2 after winding it around a cylindrical core 5c (long core tube) at predetermined lengths. Specifically, the sheet 2 is wound from the inner periphery (core 5c side) of the log 5 toward the outer periphery (i.e., from the inside to the outside in the radial direction). Once a predetermined length of the sheet 2 has been wound around the outer periphery of the core 5c, the sheet 2 is cut (divided) along a straight line along the width direction of the sheet 2 (a direction perpendicular to the longitudinal direction), thereby forming logs 5. Each log 5 has its winding end 5a glued (tail sealed) to the outer periphery in a gluing part 14, which is the final process in the log forming part 10, and then sent to the downstream adjusting part 20.

[0019] The adjusting part 20 stores a plurality of logs 5 in an accumulator 21, and sequentially sends the logs 5 to the downstream cutting part 30. Here, an example of the adjusting part 20 sending two logs 5 at a time to the cutting part 30 is shown. The cutting part 30 cuts the logs 5 sent out from the adjusting part 20 in the axial direction at predetermined intervals using a log saw 31. As a result, each log 5 is cut into a plurality of products 3.

[0020] The packaging part 40 inserts, for example, four products 3 (two products x two layers) as a set into a packaging bag 41 and seals an opening 42 of the packaging bag 41 to form a package 9. The packing section 50 packs a set of a plurality of packages 9 (for example, four packages) into a cardboard box 51. Then, the packages 9 packed in the cardboard box 51 are shipped.

[0021] [1-2.Main part configuration] <Seat manufacturing equipment> The sheet manufacturing apparatus 15 of this embodiment is incorporated into the winder 13. The sheet manufacturing apparatus 15 includes an embossing unit 16 that forms embossments on the sheet 2, and a printing unit 17 that prints on the sheet 2. The embossing unit 16 is provided on the conveying line 11 along which the sheet 2 is conveyed in the winder 13. The printing unit 17 is provided upstream of the embossing unit 16 on the conveying line 11. Therefore, the sheet 2 conveyed on the conveying line 11 has already been printed by the printing unit 17 when it reaches the embossing unit 16.

[0022] As described above, the printing unit 17 prints (so-called online printing) on ​​the sheet 2 on the conveying line 11 on which the embossing unit 16 is provided. The printing unit 17 of this embodiment prints a design on the sheet 2 by transferring colored ink onto the sheet 2. Hereinafter, a printing unit 17 that prints only on one side 2a of the sheet 2 is illustrated. Hereinafter, the printed side 2a of the sheet 2 is also referred to as the "printed side 2a," and the unprinted side 2b of the sheet 2 is also referred to as the "non-printed side 2b." The printing method of the printing unit 17 is not particularly limited, but a letterpress printing method, for example, can be applied.

[0023] The configuration of the printing unit 17 is not limited to the above example. The printing unit 17 may print on both sides 2a and 2b of the sheet 2. Furthermore, the printing unit 17 may transfer a functional chemical liquid (for example, a moisturizing liquid, a fragrant liquid, or a disinfectant liquid) instead of (or in addition to) the colored ink described above.

[0024] <Embossing unit> 2, the embossing unit 16 includes a pair of rolls 6A, 6B for embossing, and an antifouling device 1 applied to a target roll 6, which is at least one of the rolls 6A, 6B. The embossing unit 16 of this embodiment passes the sheet 2, which has been printed in the printing unit 17, between the pair of rolls 6A, 6B, to form embosses on the sheet 2.

[0025] The pair of rolls 6A, 6B are arranged facing each other with a gap between them and their respective rotation axes parallel to each other. Specifically, the pair of rolls 6A, 6B are an embossing roll 6A and a backing roll 6B. The outer peripheral surface 6c of the embossing roll 6A is formed with irregularities (recesses 6e and protrusions 6f) for embossing. In contrast, the outer peripheral surface 6d of the backing roll 6B is not formed with irregularities. In other words, the outer peripheral surface 6d of the backing roll 6B is a smoothly curved surface.

[0026] The embossing unit 16 presses the sheet 2, which is supplied between a pair of rolls 6A and 6B rotating in opposite directions in a side view (axial view), toward the receiving roll 6B with the convex portions 6f of the embossing roll 6A. In this way, the embossing unit 16 forms embossments on the sheet 2 that correspond to the concaves and convexes on the outer peripheral surface 6d of the embossing roll 6A.

[0027] In this embodiment, the embossing roll 6A is disposed on the side of the sheet 2 facing the printing surface 2a, and the receiving roll 6B is disposed on the side of the sheet 2 facing the non-printing surface 2b. Therefore, the embossing roll 6A contacts the printing surface 2a of the sheet 2, whereas the receiving roll 6B contacts the non-printing surface 2b of the embossing roll 6A without contacting the printing surface 2a. In other words, the sheet 2 is printed on the surface that contacts the embossing roll 6A (the target roll 6 to which the antifouling device 1 is applied).

[0028] <Anti-fouling device> The antifouling device 1 is configured to prevent liquids such as ink or chemicals (hereinafter also referred to as printing liquids) transferred to the sheet 2 by printing from adhering as "stains" to the outer circumferential surface of the target roll 6. In this embodiment, the antifouling device 1 applied to the embossing roll 6A is exemplified. That is, the target roll 6 of this embodiment includes only the embossing roll 6A and does not include the receiving roll 6B.

[0029] The antifouling device 1 comprises a storage section 1A for storing antifouling oil, and an oil supply section 1B for supplying the oil stored in the storage section 1A to the outer peripheral surface of the target roll 6. The storage section 1A is formed, for example, from a container for temporarily storing oil. On the other hand, the oil supply section 1B is formed, for example, with an appropriate configuration that allows the oil to be applied, sprayed, dripped, or seeped onto the outer peripheral surface of the target roll 6. The oil supply section 1B preferably supplies oil to the entire outer peripheral surface of the target roll 6.

[0030] In this embodiment, an oil supply unit 1B is exemplified, which applies oil to the outer peripheral surface of the target roll 6 using a cloth material 61. The cloth material 61 is, for example, felt, and is provided so as to contact the outer peripheral surface of the target roll 6. Note that while FIG. 2 exemplifies the cloth material 61 wound in a cylindrical shape, the shape of the cloth material 61 is not particularly limited. Oil is supplied to the cloth material 61 from the storage unit 1A.

[0031] The oil supply unit 1B applies oil to the outer peripheral surface of the target roll 6 by sliding the cloth material 61, which is soaked in oil supplied from the storage unit 1A, against the outer peripheral surface of the rotating target roll 6. The oil supply unit 1B of this embodiment uses the elastically deformable cloth material 61 to apply oil to both the recessed portions 6e and the protruding portions 6f on the outer peripheral surface 6c of the embossing roll 6A.

[0032] However, oil supply section 1B is not limited to a configuration using fabric material 61 described above. As shown in Fig. 3, oil supply section 1B may be formed with a sprayer 62 that sprays oil by air pressure. Oil supply section 1B formed with such a sprayer 62 sprays the oil stored in storage section 1A onto the outer peripheral surface of target roll 6. Note that, although Fig. 3 illustrates an example of sprayer 62 that is provided integrally with storage section 1A, sprayer 62 may be formed separately from storage section 1A.

[0033] When the antifouling device 1 is applied with an oil supply unit 1B that sprays oil as described above, it may further include a diffusion unit 1C that spreads the oil sprayed by the oil supply unit 1B over the outer circumferential surface of the target roll 6 using a brush material 63. The brush material 63 is provided so as to contact a portion of the outer circumferential surface of the target roll 6 that has already been sprayed with oil by the oil supply unit 1B but is not yet in contact with the sheet 2. In other words, the brush material 63 is disposed downstream of the position where oil is sprayed from the oil supply unit 1B and upstream of the portion of the target roll 6 that contacts the sheet 2 in the rotation direction of the target roll 6. The brush material 63 may be provided so as to be movable (slidable) relative to the outer circumferential surface of the target roll 6, or may be fixed.

[0034] Furthermore, the oil supply unit 1B may be configured to drip oil onto the outer peripheral surface of the target roll 6 from above, or may be configured to allow oil to seep from the inside of the target roll 6 onto the outer peripheral surface through a number of holes provided on the outer peripheral surface of the target roll 6. Furthermore, the oil supply unit 1B may be formed by appropriately combining the various configurations described above. For example, the oil supply unit 1B may apply the oil stored in the storage unit 1A to the outer peripheral surface of the target roll 6 using a cloth material 61 and spray it using a spray 62. Alternatively, the oil supply unit 1B may drip the oil stored in the storage unit 1A onto the outer peripheral surface of the target roll 6 from above and then apply it using the cloth material 61.

[0035] As shown in Fig. 4, the antifouling device 1 may be applied to a receiving roll 6B. That is, the target roll 6 to which the oil supply unit 1B of the antifouling device 1 supplies oil may include the receiving roll 6B instead of or in addition to the embossing roll 6A. Fig. 4 shows an example in which the target roll 6 includes both of a pair of rolls 6A and 6B, and the antifouling device 1 is applied to each of the rolls 6A and 6B. In this example, each of the rolls 6A and 6B is provided with its own dedicated storage unit 1A. However, instead of providing two storage units 1A, a single storage unit 1A common to the pair of rolls 6A and 6B may be provided.

[0036] [2. Method] 5, processes (manufacturing processes) corresponding to the above-mentioned parts are carried out on the production line 4. Specifically, on the production line 4, a log forming process S10, an adjusting process S20, a cutting process S30, a packaging process S40, and a boxing process S50 are carried out in this order. In each of the above steps, processing is performed by a device in which the "step" in the name is replaced with "part." For example, in the log formation step S10, processing is performed by the log formation part 10, and in the adjustment step S20, processing is performed by the adjustment part 20.

[0037] The log forming process S10 includes a printing process S17 performed in the printing unit 17 and an embossing process S16 performed in the embossing unit 16. As described above, on the conveying line 11, the printing unit 17 is provided upstream of the embossing unit 16, and therefore the printing process S17 is performed before the embossing process S16.

[0038] The antifouling method according to this embodiment is used in the embossing step S16 (embossing unit 16) and is performed by the antifouling device 1. The antifouling method includes a storage step S1 performed by the storage section 1A and an oiling step S2 performed by the oiling section 1B. The storage step S1 stores antifouling oil. Meanwhile, the oiling step S2 supplies the antifouling oil stored in the storage step S1 to the outer peripheral surface of the target roll 6. It is sufficient for the antifouling method to include at least the oiling step S2 that supplies antifouling oil to the outer peripheral surface of the target roll 6, and the storage step S1 can be omitted.

[0039] The oiling step S2 of this embodiment includes an application step S3 in which antifouling oil is applied to the outer peripheral surface of the target roll 6 using a cloth material 61. However, instead of or in addition to the application step S3, the oiling step S2 may include a spraying step S4 in which antifouling oil is sprayed onto the outer peripheral surface of the target roll 6, a dripping step S5 in which antifouling oil is dripped from above onto the outer peripheral surface of the target roll 6, or an exuding step S6 in which antifouling oil is exuded from the inside of the target roll 6 onto its outer peripheral surface. Furthermore, when the oiling step S2 includes the above-mentioned spraying step S4, the antifouling method may further include a spreading step S7 in which the oil sprayed in the spraying step S4 is spread over the outer peripheral surface of the target roll 6 using a brush material 63.

[0040] [3. Actions and Effects] (1) According to the above-described antifouling device 1, the oil supply unit 1B supplies antifouling oil to the outer peripheral surface of the target roll 6 in the embossing unit 16, thereby preventing the printing liquid transferred to the sheet 2 by printing from adhering to the outer peripheral surface of the target roll 6 as "stains." That is, by supplying antifouling oil in advance to the outer peripheral surface of the target roll 6 to which the printing liquid from the sheet 2 may adhere in the embossing unit 16, the outer peripheral surface of the target roll 6 can be made in a state where the printing liquid (stains) are less likely to adhere before the outer peripheral surface of the target roll 6 comes into contact with the sheet 2. Therefore, in the embossing unit 16, adhesion of stains to the outer peripheral surface of the target roll 6 due to printing on the sheet 2 can be prevented in advance.

[0041] This makes it difficult for printing liquid to accumulate on the outer peripheral surface of the target roll 6, thereby improving the processing accuracy of the embossing unit 16. For example, it is possible to suppress changes in the shape of the embossments formed on the sheet 2 and the occurrence of wrinkles in the sheet 2. This makes it possible to suppress deterioration in the quality of the sheet 2. Furthermore, as described above, it is possible to suppress printing liquid from accumulating on the outer peripheral surface of the target roll 6, which reduces the frequency of cleaning the target roll 6. This also improves the operating efficiency of the embossing unit 16.

[0042] (2) When colored ink is transferred to the sheet 2 by printing, the design of the sheet 2 can be improved. However, when the ink adheres to the outer peripheral surface of the target roll 6, there is a risk that the ink may be transferred again to the sheet 2, thereby staining the sheet 2. In contrast, according to the anti-fouling device 1 as described above, the oil supply unit 1B supplies oil to the outer peripheral surface of the target roll 6, thereby preventing ink (stains) from adhering to the outer peripheral surface of the target roll 6. Therefore, staining of the sheet 2 by ink can also be prevented.

[0043] (3) The oil supply unit 1B, which applies oil to the outer peripheral surface of the target roll 6 using the cloth material 61, makes it easy to supply oil uniformly and thinly to the outer peripheral surface of the target roll 6. Therefore, it is possible to effectively prevent the adhesion of dirt to the outer peripheral surface of the target roll 6 caused by printing on the sheet 2, while also preventing excessive oil from adhering to the sheet 2 from the outer peripheral surface of the target roll 6.

[0044] (4) The oil supply unit 1B, which sprays oil onto the outer peripheral surface of the target roll 6, makes it easy to supply a thin layer of oil over a wide area of ​​the outer peripheral surface of the target roll 6. This makes it possible to prevent excessive oil from adhering to the sheet 2 from the outer peripheral surface of the target roll 6 while also preventing dirt from adhering to the outer peripheral surface of the target roll 6 over a wide area.

[0045] (5) The antifouling device 1, which includes the diffusion section 1C that spreads the oil sprayed by the oil supply section 1B onto the outer peripheral surface of the target roll 6 using the brush material 63, can diffuse the oil uniformly over the outer peripheral surface of the target roll 6. This effectively prevents the adhesion of dirt to the outer peripheral surface of the target roll 6 caused by printing on the sheet 2 over a wide area, while further preventing excessive oil from adhering to the sheet 2 from the outer peripheral surface of the target roll 6.

[0046] (6) In an embossing roll 6A having irregularities formed on its outer peripheral surface 6c, there is a risk that printing liquid may seep into the recesses 6e or be pressed against the protrusions 6f. In contrast, if the target roll 6 includes an embossing roll 6A, the oil supply unit 1B supplies oil to the outer peripheral surface 6c of the embossing roll 6A, thereby effectively preventing dirt from adhering to the irregular outer peripheral surface 6c. This prevents changes in the shape of the embossments formed on the sheet 2 by the embossing roll 6A, and reduces the frequency of cleaning the embossing roll 6A.

[0047] (7) In the case of a backing roll 6B having no irregularities on its outer peripheral surface 6d, it is easy to supply oil uniformly and thinly to the outer peripheral surface 6d. Therefore, if the target roll 6 includes a backing roll 6B, the oil supply unit 1B supplies oil to the outer peripheral surface 6d of the backing roll 6B, which not only prevents dirt from adhering to the outer peripheral surface 6d of the backing roll 6B but also easily prevents excess oil from adhering to the sheet 2 from the outer peripheral surface 6d of the backing roll 6B.

[0048] (8) According to the embossing unit 16 equipped with the above-described antifouling device 1 and the pair of rolls 6A, 6B, the adhesion of dirt to the outer peripheral surface of the target roll 6 is suppressed by the action of the antifouling device 1 as described above, thereby improving the embossing accuracy. This can prevent deterioration in the quality of the sheet 2. In addition, the frequency of cleaning the target roll 6 can be reduced, thereby improving the operating efficiency of the embossing unit 16.

[0049] (9) In the conveying line 11 along which the long sheet 2 is conveyed, if the printing unit 17 is provided upstream of the embossing unit 16, the sheet 2 is embossed by the embossing unit 16 after the printing unit 17 prints on the sheet 2. As a result, the printing liquid transferred by the printing unit 17 on the sheet 2 is likely to reach the embossing unit 16 while still wet, which may cause the printing liquid from the sheet 2 to easily adhere to the outer peripheral surfaces of the rolls 6A and 6B.

[0050] In contrast, according to the above-described sheet manufacturing apparatus 15, even if the embossing unit 16 and the printing unit 17 are provided on the same conveying line 11, the action of the anti-fouling device 1 as described above suppresses adhesion of stains to the outer peripheral surface of the target roll 6. Therefore, even if the printing liquid on the sheet 2 is not yet dried in the embossing unit 16, adhesion of the printing liquid to the outer peripheral surface of the target roll 6 is suppressed, thereby improving the embossing processing accuracy and reducing the frequency of cleaning the target roll 6.

[0051] In the embossing unit 16, even if the printing liquid on the sheet 2 is dry, the pressure associated with the embossing process can cause the printing liquid to adhere from the sheet 2 to the outer peripheral surfaces of the rolls 6A and 6B. Therefore, even if the printing liquid on the sheet 2 is already dry in the embossing unit 16, the problem of stains adhering to the outer peripheral surfaces of the rolls 6A and 6B due to printing on the sheet 2 can still occur. In contrast, the above-mentioned anti-fouling device 1 can suppress the adhesion of stains to the outer peripheral surfaces of the target rolls 6, as described above, whether the printing liquid in the embossing unit 16 is dry or not. (10) According to the above antifouling method, the same actions and effects as those of the antifouling device 1 can be obtained.

[0052] (11) When the outer peripheral surface of the target roll 6 contacts the printing surface 2a of the sheet 2 (see, for example, the embossing roll 6A shown in Figures 2 and 3), the printing liquid is more likely to adhere to the outer peripheral surface of the target roll 6 than when the outer peripheral surface of the target roll 6 contacts the non-printing surface 2b rather than the printing surface 2a. On the other hand, in a sheet 2 with a printed surface 2a, the printing liquid may seep from the printing surface 2a to the non-printing surface 2b. For this reason, even when the outer peripheral surface of the target roll 6 contacts the non-printing surface 2b rather than the printing surface 2a of the sheet 2 (see, for example, the receiving roll 6B shown in Figure 4), there is a risk that the printing liquid that seeps from the printing surface 2a to the non-printing surface 2b may adhere to the outer peripheral surface of the target roll 6.

[0053] In contrast, the above-described antifouling device 1 can suppress adhesion of stains caused by printing on the sheet 2 to the outer peripheral surface of the target roll 6, as described above, regardless of whether the outer peripheral surface of the target roll 6 comes into contact with the printed surface 2a or the non-printed surface 2b of the sheet 2. Therefore, regardless of whether the above-described embossing roll 6A or backing roll 6B is used as the target roll 6, both the processing accuracy and the operating efficiency of the embossing unit 16 can be improved.

[0054] [4. Modifications] The structure of the sheet 2 is not limited to the above example. As illustrated in Fig. 6, in a sheet 2' having a two-layer structure consisting of an upper layer 2U and a lower layer 2L, the upper surface 2c of the upper layer 2U and the lower surface 2d of the lower layer 2L, which are exposed when the upper layer 2U and the lower layer 2L are stacked, may both be non-printed surfaces. In this case, either the lower surface 2e of the upper layer 2U or the upper surface 2f of the lower layer 2L, which are not exposed when stacked, may be a printed surface. Fig. 6 illustrates a printing unit 17 that prints on the lower surface 2e of the upper layer 2U, and does not illustrate the above-mentioned anti-fouling device 1.

[0055] If printing is performed on the non-exposed side of the multilayer sheet 2' as in this modified example, direct contact between the outer circumferential surface of the target roll 6 and the printed surface of the sheet 2' can be avoided when single-embossing the sheet 2' in the embossing unit 16. Furthermore, direct contact between the outer circumferential surface of the target roll 6 and the printed surface of the sheet 2' can also be avoided when double-embossing the sheet 2'. This further reduces adhesion of printing liquid to the outer circumferential surface of the target roll 6. This reduces contamination of the target roll 6, thereby reducing cleaning time and frequency, and achieving even better results when single-embossing than when double-embossing.

[0056] Furthermore, even when printing is performed on the lower surface 2e of the upper layer 2U as in this modified example, the printing is usually performed on the lower surface 2e of the upper layer 2U (the basis weight is 10 to 20 g / m 2If the thickness of the sheet 2′ is less than 1 / 2 mm, the visibility of the print seen from the upper layer 2U side (surface side) is the same as when printing is done on the upper surface 2c of the upper layer 2U. On the other hand, when printing is done on the upper surface 2f of the lower layer 2L instead of the lower surface 2e of the upper layer 2U, direct contact between the outer peripheral surface of the target roll 6 and the printed surface of the sheet 2′ is avoided as described above, and therefore, although a stain-resistant effect is obtained, the visibility of the print seen from the upper layer 2U side (surface side) is reduced, which is not preferable. The sheet 2 does not have to be made of paper. The printing unit 17 may be provided in a location different from the conveying line 11 where the embossing unit 16 is provided. In other words, the printing performed on the sheet 2 does not have to be online printing as described above. [Explanation of symbols]

[0057] 1 Antifouling device 1A Storage section 1B Refueling Station 1C Diffusion section 2.2' sheet 2a Print side 2b Non-printing side 2c Top surface 2d bottom surface 2e Bottom side 2f top surface 2L lower layer 2U upper layer 3 products 4 Production Lines 5 Logs 5a End of winding 5c Core 6 Target Role 6A Embossing Roll (Roll) 6B Receiving roll (roll) 6c Outer surface 6d Outer surface 6e Recess 6f convex part 9 packages 10 Log formation part 11 Conveyor line 12 Raw roll 13 Winder 14 Glue part 15 Sheet manufacturing equipment 16 Embossing unit 17 Printing Unit 20 Adjustment Part 21 Accumulator 30 Cutting Part 31 Log saw 40 Packaging Section 41 Packaging bag 42 Opening 50 Packing Part 51 Cardboard Box 61 Cloth materials 62 Spray 63 Brush material

Claims

1. an anti-fouling device for an embossing unit that passes a printed sheet between a pair of rolls to form embosses on the sheet; the pair of rolls disposed opposite to each other in the embossing unit, The antifouling device is a storage section for storing antifouling oil; an oil supply unit that supplies the oil stored in the storage unit to the outer peripheral surface of a target roll that is at least one of the pair of rolls. An embossing unit characterized by the above.

2. The sheet has colored ink transferred thereto by the printing.

2. The embossing unit according to claim 1.

3. The oil supply unit applies the oil stored in the storage unit to the outer peripheral surface of the target roll using a cloth material.

3. The embossing unit according to claim 1 or 2.

4. The oil supply unit sprays the oil stored in the storage unit onto the outer circumferential surface of the target roll.

3. The embossing unit according to claim 1 or 2.

5. A diffusion section is provided which spreads the oil sprayed in the oil supply section onto the outer peripheral surface of the target roll using a brush material.

5. The embossing unit according to claim 4.

6. The target roll includes an embossing roll having irregularities formed on the outer peripheral surface.

3. The embossing unit according to claim 1 or 2.

7. The target roll includes a roll having no irregularities formed on the outer peripheral surface.

3. The embossing unit according to claim 1 or 2.

8. the embossing unit according to claim 1 or 2, which is provided on a conveying line along which the long sheet is conveyed; a printing unit that is provided upstream of the embossing unit on the conveying line and that prints on the sheet. A sheet manufacturing apparatus characterized by:

9. 1. A stain-proofing method for an embossing unit, comprising: passing a printed sheet between a pair of rolls to form embosses on the sheet; an oiling step for supplying antifouling oil to the outer peripheral surface of the target roll, which is at least one of the pair of rolls arranged opposite to each other in the embossing unit; An antifouling method characterized by the above.

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