JP2023174051A - Anti-fouling device, embossing unit, sheet manufacturing apparatus, and ant-fouling method - Google Patents

Abstract

To suppress the adhesion of stains to the outer peripheral surface of a roll caused by printing applied to a sheet, in an embossing unit.SOLUTION: An anti-fouling device 1 according to the present invention relates to an embossing unit 16 that forms embossing on a sheet 2 with printing by passing the sheet 2 between a pair of rolls 6A and 6B, and is provided with a storage section 1A and an oil supply section 1B. The storage section 1A stores oil for antifouling. The oil supply section 1B supplies oil stored in the storage section 1A to the outer peripheral surface of the target roll 6, which is at least one of the pair of rolls 6A and 6B.SELECTED DRAWING: Figure 2

Description

The present invention relates to an antifouling device for an embossing unit that forms embossing on a sheet, an embossing unit equipped with this antifouling device, a sheet manufacturing apparatus equipped with this embossing unit, and a method for antifouling an embossing unit.

Conventionally, embossing units are known that form embossing on a long sheet by passing the sheet between a pair of rolls. For example, Patent Document 1 discloses a technique in which a chemical solution is applied to a continuous sheet using a printing machine in a production line for logs used as toilet rolls, and then embossing is applied to the continuous sheet using a pair of rolls. This technology sprays high-pressure fluid onto each roll and suctions fluid containing dirt to clean dirt caused by chemical fluids from each roll while adding embossing to the continuous sheet.

JP 2013-13433 Publication

However, the technology of Patent Document 1 cleans each roll with high-pressure fluid after the dirt caused by the chemical applied to the sheet by the printing machine adheres to each roll. It cannot be prevented from happening. Therefore, the conventional technology has room for improvement in suppressing the adhesion of dirt to the outer circumferential surface of the roll due to printing applied to the sheet.

This project was developed in view of the above-mentioned issues, and one of the purposes is to suppress the adhesion of dirt to the outer peripheral surface of the roll caused by printing on the sheet in the embossing unit. . Note that this purpose is not limited to this purpose, but also includes functions and effects derived from each configuration shown in "Details for Carrying Out the Invention" that will be described later, which cannot be obtained with conventional techniques. It can be positioned for other purposes.

The antifouling device in this case is described in (1) to (7) below.
(1)
An antifouling device for an embossing unit that passes a printed sheet between a pair of rolls to form an embossing on the sheet,
a storage section that stores oil for antifouling;
An antifouling device comprising: an oil supply section that supplies the oil stored in the storage section to the outer circumferential surface of at least one of the pair of rolls, the target roll.
(2)
The antifouling device according to item (1), wherein the sheet has colored ink transferred thereto by the printing.
(3)
The antifouling device according to (1) or (2), wherein the oil supply section applies the oil stored in the storage section to the outer circumferential surface of the target roll using a cloth material.
(4)
The antifouling device according to any one of (1) to (3), wherein the oil supply section sprays the oil stored in the storage section onto the outer circumferential surface of the target roll.
(5)
The antifouling device according to (4), further comprising a diffusion section that spreads the oil sprayed by the oil supply section onto the outer circumferential surface of the target roll using a brush material.
(6)
The antifouling device according to any one of (1) to (5), wherein the target roll includes an embossing roll having unevenness formed on the outer peripheral surface.
(7)
The antifouling device according to any one of (1) to (6), wherein the target roll includes a roll in which no unevenness is formed on the outer peripheral surface.

The embossing unit in this case is described in (8) below.
(8)
The antifouling device according to any one of (1) to (7),
An embossing unit comprising: the pair of rolls.

The sheet manufacturing equipment in this case is described in (9) below.
(9)
The embossing unit according to (8), which is provided on a conveyance line through which the long sheet is conveyed;
A sheet manufacturing apparatus comprising: a printing unit that is provided upstream of the embossing unit in the conveyance line and performs the printing on the sheet.

The antifouling method in this case is described in (10) below.
(10)
An antifouling method for an embossing unit in which a printed sheet is passed between a pair of rolls to form an embossing on the sheet, the method comprising:
An antifouling method comprising the step of supplying antifouling oil to the outer peripheral surface of the target roll, which is at least one of the pair of rolls.

According to this case, antifouling oil is supplied to the outer circumferential surface of the target roll, which is at least one of the pair of rolls in the embossing unit, so that the outer circumferential surface of the roll is free from dirt caused by printing on the sheet. Adhesion can be suppressed.

1 is a schematic perspective view of a production line incorporating a sheet production apparatus according to an embodiment. FIG. 2 is a schematic side view of an embossing unit provided in the sheet manufacturing apparatus of FIG. 1. FIG. FIG. 3 is a schematic side view (a view corresponding to FIG. 2) of an embossing unit to which an antifouling device according to a modified example is applied. FIG. 3 is a schematic side view (corresponding to FIG. 2) of an embossing unit to which an antifouling device according to another modification is applied. It is a flowchart of a manufacturing process including an embossing process in which an antifouling method is used. FIG. 7 is a schematic side view showing a printing unit and an embossing unit when a sheet according to a modified example is applied.

Hereinafter, a mode for carrying out the present invention will be described. The embodiments shown below are merely illustrative, and there is no intention to exclude the application of various modifications and techniques not specified here. Each configuration of the embodiments described below can be implemented with various modifications without departing from the spirit thereof. Further, they can be selected or combined as necessary.

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

On the production line 4, there is a log forming part 10 that forms a roll-shaped log 5 that is longer in the axial direction than the product 3, and the logs 5 formed in the log forming part 10 are temporarily stocked and the sending timing of the logs 5 is adjusted. and a cutting part 30 that cuts the log 5 sent out from the adjustment part 20 into a plurality of products 3. Furthermore, the manufacturing line 4 is provided with a packaging part 40 for packaging the products 3 cut into pieces in the cutting part 30 into fixed numbers, and a boxing part 50 for packaging the packages 9 of the products 3 packaged in the packaging part 40. It will be done.

Hereinafter, upstream and downstream will be defined based on the order of each process performed on the manufacturing line 4. In 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.

The log forming part 10 unwinds the sheet 2 from a raw roll 12 on which the sheet 2 is wound, and rewinds the sheet 2 with a winder 13 to form a log 5. The sheet 2 of this embodiment is a strip-shaped (elongated) paper material that is wider than the product 3. Further, the log 5 is a paper material wound into a roll shape, and has a shape in which the length in the axial direction is equal to the length in the axial direction of the raw fabric roll 12, and the diameter is equal to the diameter of the product 3. .

Note that the sheet 2 may have a single layer (1 ply) structure made of one sheet of paper material, or may have a multilayer (2 or more ply) structure made of multiple sheets of paper material laminated. . In other words, the raw roll 12 may be a primary roll (jumbo roll) around which a single layer sheet 2 is wound, or a secondary roll around which a multilayer sheet 2 is wound. Good too.

The winder 13 continuously forms logs 5 by cutting the sheet 2 each time it is wound around a cylindrical core 5c (elongated core tube) for a predetermined length. Specifically, the sheet 2 is wound from the inner circumferential side (core 5c side) of the log 5 toward the outer circumferential side (that is, from the inner side to the outer side in the radial direction). After the sheet 2 of a predetermined length is 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 (direction perpendicular to the longitudinal direction). , log 5 is formed. Each log 5 is sent to the adjustment part 20 downstream after the winding end 5a is pasted (tail sealed) on the outer peripheral surface in the pasting part 14, which is the final step of the log forming part 10.

The adjustment part 20 stores a plurality of logs 5 in an accumulator 21 and sequentially sends out the logs 5 to a downstream cutting part 30. Here, the adjustment part 20 that sends out two logs 5 at a time toward the cutting part 30 is illustrated.
The cutting part 30 cuts the log 5 sent out from the adjustment part 20 at predetermined intervals in the axial direction using a log saw 31. Thereby, each log 5 is divided into a plurality of products 3.

The packaging part 40 inserts, for example, four products 3 (two products x two stages) into a packaging bag 41 as a set, and seals the opening 42 of the packaging bag 41 to form the package 9.
The boxing part 50 packs a plurality (for example, four) of packages 9 into a cardboard box 51 as a set. The package 9 packed in the cardboard box 51 is then shipped.

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

As described above, the printing unit 17 performs printing (so-called online printing) on the sheet 2 on the conveyance line 11 in which the embossing unit 16 is provided. The printing unit 17 of this embodiment prints a pattern on the sheet 2 by transferring colored ink onto the sheet 2. Here, a printing unit 17 that prints only on one side 2a of the sheet 2 is illustrated. Hereinafter, one surface 2a of the sheet 2 on which printing is applied is also referred to as the "printing surface 2a", and the other surface 2b of the sheet 2 on which printing is not performed is also referred to as the "non-printing surface 2b". The printing method of the printing unit 17 is not particularly limited, but for example, a letterpress printing method can be applied.

Note that 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. Further, instead of (or in addition to) the colored ink described above, the printing unit 17 may transfer a functional chemical solution (for example, a moisturizing solution, an aromatic solution, or a disinfectant solution).

<Emboss unit>
As shown in FIG. 2, the embossing unit 16 includes a pair of embossing rolls 6A and 6B, and an antifouling device 1 applied to a target roll 6, which is at least one of the rolls 6A and 6B. The embossing unit 16 of this embodiment passes the sheet 2 printed by the printing unit 17 between the pair of rolls 6A and 6B to form an embossing on the sheet 2.

The pair of rolls 6A and 6B are arranged facing each other with a gap between them, with their rotational axes being parallel to each other. Specifically, the pair of rolls 6A and 6B are an embossing roll 6A and a receiving roll 6B. The outer peripheral surface 6c of the embossing roll 6A is formed with unevenness for embossing (recesses 6e and protrusions 6f). In contrast, no unevenness is formed on the outer circumferential surface 6d of the receiving roll 6B. That is, the outer peripheral surface 6d of the receiving roll 6B forms a smooth curved surface.

The embossing unit 16 presses the sheet 2, which is supplied between a pair of rolls 6A and 6B that rotate in opposite directions when viewed from the side (as seen in the axial direction), toward the receiving roll 6B with the convex portion 6f of the embossing roll 6A. . Thereby, the embossing unit 16 forms embossing on the sheet 2 corresponding to the unevenness of the outer circumferential surface 6d of the embossing roll 6A.

In this embodiment, the embossing roll 6A is arranged on the printing surface 2a side of the sheet 2, and the receiving roll 6B is arranged on the non-printing surface 2b side. Therefore, the embossing roll 6A contacts the printing surface 2a of the sheet 2, whereas the receiving roll 6B does not contact the printing surface 2a of the embossing roll 6A, but contacts the non-printing surface 2b. In other words, the sheet 2 is printed on the surface that comes into contact with the embossing roll 6A (target roll 6 to which the antifouling device 1 is applied).

<Antifouling device>
The antifouling device 1 is used to prevent liquids such as ink and chemicals transferred to the sheet 2 by printing (hereinafter also referred to as printing liquid) from adhering as "stains" to the outer peripheral surface of the target roll 6. The composition is as follows. In this embodiment, an antifouling device 1 applied to an embossing roll 6A is illustrated. That is, the target roll 6 of this embodiment includes only the embossing roll 6A and does not include the receiving roll 6B.

The antifouling device 1 includes a storage section 1A that stores oil for antifouling, and an oil supply section 1B that supplies the oil stored in the storage section 1A to the outer peripheral surface of the target roll 6. The reservoir 1A is formed of, for example, a container that temporarily stores oil. On the other hand, the oil supply section 1B is formed with an appropriate structure capable of applying, spraying, dripping, or seeping oil onto the outer circumferential surface of the target roll 6, for example. The oil supply unit 1B preferably supplies oil to the entire outer peripheral surface of the target roll 6.

In this embodiment, an oil supply section 1B that applies oil to the outer peripheral surface of the target roll 6 using a cloth material 61 is illustrated. The cloth material 61 is made of felt, for example, and is provided so as to be in contact with the outer peripheral surface of the target roll 6 . Although FIG. 2 shows an example of the cloth material 61 wound into a columnar shape, the shape of the cloth material 61 is not particularly limited. Oil is supplied to the cloth material 61 from the reservoir 1A.

The oil supply section 1B applies oil to the outer circumferential surface of the target roll 6 with the cloth material 61 by sliding the cloth material 61 impregnated with oil supplied from the storage section 1A onto the outer circumferential surface of the rotating target roll 6. do. The oil supply section 1B of this embodiment uses an elastically deformable cloth material 61 to apply oil to both the recesses 6e and the projections 6f on the outer peripheral surface 6c of the embossing roll 6A.

However, the oil supply section 1B is not limited to the configuration using the cloth material 61 described above. As shown in FIG. 3, the oil supply section 1B may be formed of a spray 62 that sprays oil using air pressure. The oil supply part 1B formed by such a spray 62 sprays the oil stored in the storage part 1A onto the outer circumferential surface of the target roll 6. In addition, although FIG. 3 illustrates the spray 62 provided integrally with the storage part 1A, the spray 62 may be formed separately from the storage part 1A.

When the oil supply unit 1B that sprays oil as described above is applied, the antifouling device 1 further includes a diffusion unit 1C that spreads the oil sprayed by the oil supply unit 1B onto the outer peripheral surface of the target roll 6 using a brush material 63. It's okay. The brush material 63 is provided so as to be in contact with a portion of the outer peripheral surface of the target roll 6 that has been sprayed with oil by the oil supply unit 1B and is not in contact with the sheet 2. In other words, the brush material 63 is arranged downstream of the position where oil is sprayed from the oil supply section 1B and upstream of the part where the target roll 6 contacts the sheet 2 in the rotational direction of the target roll 6. . The brush material 63 may be provided movably (slidably) with respect to the outer peripheral surface of the target roll 6, or may be fixed.

Further, the oil supply section 1B may be configured to drip oil onto the outer circumferential surface of the target roll 6 from above, or may be configured to drip oil onto the outer circumferential surface of the target roll 6 through a large number of holes provided in the outer circumferential surface of the target roll 6. The structure may be such that the oil oozes out onto the outer circumferential surface. Furthermore, the oil supply section 1B may be formed by appropriately combining the various configurations described above. For example, the oil supply section 1B may apply the oil stored in the storage section 1A to the outer circumferential surface of the target roll 6 with the cloth material 61 and may also spray the oil with the spray 62. Alternatively, the oil supply section 1B may drip the oil stored in the storage section 1A onto the outer circumferential surface of the target roll 6 from above, and then apply the oil using the cloth material 61.

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 oil is supplied by the oil supply section 1B of the antifouling device 1 may include a 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 a pair of rolls 6A and 6B, and the above-mentioned antifouling device 1 is applied to each roll 6A and 6B. In this example, each roll 6A, 6B is provided with a dedicated storage section 1A, but instead of having two storage sections 1A, a common storage section 1A is provided for the pair of rolls 6A, 6B. Two reservoirs 1A may be provided.

[2. Method]
As shown in FIG. 5, in the manufacturing line 4, each process (manufacturing process) corresponding to each part described above is performed. Specifically, in 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 performed in this order.
In each of the above steps, processing is carried out by an apparatus in which "process" in the name is replaced with "part". For example, in the log forming step S10, processing is performed by the log forming part 10, and in the adjusting step S20, processing is performed by the adjusting part 20.

The log forming step S10 includes a printing step S17 performed by the printing unit 17 and an embossing step S16 performed by the embossing unit 16. As described above, in the transport line 11, the printing unit 17 is provided upstream of the embossing unit 16, so the printing step S17 is performed before the embossing step S16.

The antifouling method according to the present embodiment is used in the embossing step S16 (emboss unit 16), and is carried out by the antifouling device 1 described above. The antifouling method includes a storage step S1 performed by the storage section 1A described above, and a refueling step S2 performed by the refueling section 1B described above. In the storage step S1, antifouling oil is stored. On the other hand, in the oil supply step S2, the antifouling oil stored in the storage step S1 is supplied to the outer peripheral surface of the target roll 6. Note that the antifouling method only needs to include at least the above oil supply step S2 of supplying antifouling oil to the outer peripheral surface of the target roll 6, and the above storage step S1 can be omitted.

The oil supply step S2 of this embodiment includes an application step S3 of applying antifouling oil to the outer peripheral surface of the target roll 6 using a cloth material 61. However, in place of or in addition to the coating step S3, the oil supply step S2 includes a spraying step S4 in which antifouling oil is sprayed onto the outer peripheral surface of the target roll 6, and a spraying step S4 in which antifouling oil is sprayed onto the outer peripheral surface of the target roll 6. It may include a dripping step S5 in which the oil is dripped from above, and a dyeing step S6 in which the antifouling oil is oozed from the inside of the target roll 6 onto its outer peripheral surface. Furthermore, the antifouling method may further include a diffusion step S7 in which the oil sprayed in the spraying step S4 is spread on the outer peripheral surface of the target roll 6 with a brush material 63 when the oil supply step S2 includes the above-mentioned spraying step S4. .

[3. Action and effect]
(1) According to the above-described antifouling device 1, since the oil supply unit 1B supplies antifouling oil to the outer peripheral surface of the target roll 6 in the embossing unit 16, the printing liquid transferred to the sheet 2 by printing is the target. It is possible to prevent "dirt" from adhering to the outer peripheral surface of the roll 6. That is, in the embossing unit 16, by supplying antifouling oil in advance to the outer circumferential surface of the target roll 6 to which the printing liquid from the sheet 2 can adhere, before the outer circumferential surface of the target roll 6 contacts the sheet 2. In addition, the outer circumferential surface of the target roll 6 can be kept in a state where printing liquid (stain) is difficult to adhere to. Therefore, in the embossing unit 16, it is possible to prevent dirt from adhering to the outer peripheral surface of the target roll 6 due to printing applied to the sheet 2.

This makes it difficult for the printing liquid to accumulate on the outer circumferential surface of the target roll 6, so that the processing accuracy by the embossing unit 16 can be improved. For example, changes in the shape of the embossing formed on the sheet 2 and generation of wrinkles on the sheet 2 can be suppressed. Therefore, deterioration in the quality of the sheet 2 can be suppressed. Furthermore, as described above, since the printing liquid becomes difficult to accumulate on the outer circumferential surface of the target roll 6, the frequency of cleaning the target roll 6 can be reduced. Therefore, the operating efficiency of the embossing unit 16 is also improved.

(2) When colored ink is transferred to the sheet 2 by printing, the design of the sheet 2 can be improved, but when the ink adheres to the outer peripheral surface of the target roll 6, this ink is transferred to the sheet 2 again. There is a possibility that the sheet 2 may become dirty due to the transfer. On the other hand, according to the antifouling device 1 as described above, since the oil supply section 1B supplies oil to the outer circumferential surface of the target roll 6, adhesion of ink (stain) to the outer circumferential surface of the target roll 6 can be suppressed. Therefore, staining of the sheet 2 due to ink can also be suppressed.

(3) According to the oil supply unit 1B that applies oil to the outer peripheral surface of the target roll 6 using the cloth material 61, it becomes easy to uniformly and thinly supply oil to the outer peripheral surface of the target roll 6. Therefore, while the adhesion of dirt to the outer circumferential surface of the target roll 6 caused by printing applied to the sheet 2 is effectively suppressed, excessive oil adhesion from the outer circumferential surface of the target roll 6 to the sheet 2 is suppressed. can.

(4) According to the oil supply unit 1B that sprays oil onto the outer circumferential surface of the target roll 6, it becomes easy to supply a thin amount of oil to a wide range of the outer circumferential surface of the target roll 6. For this reason, while suppressing the adhesion of dirt to the outer peripheral surface of the target roll 6 over a wide range, it is possible to suppress excessive oil from adhering to the sheet 2 from the outer peripheral surface of the target roll 6.

(5) According to the antifouling device 1 equipped with the diffusion section 1C, which spreads the oil sprayed in the oil supply section 1B onto the outer peripheral surface of the target roll 6 using the brush material 63, the oil is uniformly spread on the outer peripheral surface of the target roll 6. can. Therefore, while the adhesion of dirt to the outer peripheral surface of the target roll 6 caused by printing on the sheet 2 is effectively suppressed over a wide range, excessive oil adhesion from the outer peripheral surface of the target roll 6 to the sheet 2 can be prevented. can be further suppressed.

(6) In the embossing roll 6A having irregularities formed on the outer circumferential surface 6c, there is a possibility that the printing liquid may enter the recesses 6e or be pressed against the protrusions 6f. On the other hand, if the target roll 6 includes the embossing roll 6A, oil is supplied to the outer circumferential surface 6c of the embossing roll 6A by the oil supply unit 1B, thereby effectively reducing the adhesion of dirt to the uneven outer circumferential surface 6c. can be suppressed. Therefore, it is possible to suppress changes in the shape of the embossing formed on the sheet 2 by the embossing roll 6A, and the frequency of cleaning the embossing roll 6A can be reduced.

(7) In the receiving roll 6B with no unevenness formed on the outer circumferential surface 6d, it is easy to uniformly and thinly supply oil to the outer circumferential surface 6d. Therefore, if the target roll 6 includes the receiving roll 6B, oil is supplied to the outer peripheral surface 6d of the receiving roll 6B by the oil supply section 1B, thereby suppressing the adhesion of dirt to the outer peripheral surface 6d of the receiving roll 6B. In addition, it is possible to easily suppress excessive oil from adhering to the sheet 2 from the outer circumferential surface 6d of the receiving roll 6B.

(8) According to the embossing unit 16 that includes the antifouling device 1 and the pair of rolls 6A and 6B, as described above, the action of the antifouling device 1 suppresses the adhesion of dirt to the outer peripheral surface of the target roll 6. As a result, the precision of embossing can be improved. Therefore, deterioration in the quality of the sheet 2 can be suppressed. Furthermore, since the frequency of cleaning the target roll 6 can be reduced, the operating efficiency of the embossing unit 16 can be increased.

(9) If the printing unit 17 is provided upstream of the embossing unit 16 in the conveyance line 11 on which the long sheet 2 is conveyed, then after the printing unit 17 prints on the sheet 2, the embossing unit Emboss processing is performed on the sheet 2 by 16. Therefore, on the sheet 2, the printing liquid transferred by the printing unit 17 can easily reach the embossing unit 16 in an undried state, and the printing liquid can easily adhere to the outer peripheral surfaces of the rolls 6A and 6B from the sheet 2. There is a possibility that this will happen.

On the other hand, according to the sheet manufacturing apparatus 15 described above, even if the embossing unit 16 and the printing unit 17 are provided in the same conveyance line 11, the outer periphery of the target roll 6 is The adhesion of dirt to the surface is suppressed. Therefore, even if the printing liquid on the sheet 2 is not dried in the embossing unit 16, adhesion of the printing liquid to the outer circumferential surface of the target roll 6 is suppressed, so that the precision of embossing can be improved, and The cleaning frequency of the target roll 6 can be lowered.

In the embossing unit 16, even if the printing liquid on the sheet 2 is dry, the printing liquid may adhere to the outer peripheral surfaces of the rolls 6A and 6B from the sheet 2 due to the pressure associated with embossing. Therefore, even if the printing liquid on the sheet 2 is already dried in the embossing unit 16, the problem of dirt adhering to the outer peripheral surfaces of the rolls 6A and 6B due to the printing applied to the sheet 2 can be avoided. It can occur. On the other hand, according to the above-mentioned antifouling device 1, regardless of whether the printing liquid is in a dry state or in an undried state in the embossing unit 16, the outer circumferential surface of the target roll 6 is free from dirt as described above. Adhesion can be suppressed.
(10) According to the above antifouling method, the same actions and effects as the antifouling device 1 can be obtained.

(11) When the outer peripheral surface of the target roll 6 contacts the printing surface 2a of the sheet 2 (for example, see the embossing roll 6A shown in FIGS. 2 and 3), the outer peripheral surface of the target roll 6 is not the printing surface 2a but the non-printing surface. The printing liquid is more likely to adhere to the outer peripheral surface of the target roll 6 than when it comes into contact with the surface 2b. On the other hand, in the sheet 2 whose printed surface 2a is printed, the printing liquid may seep out from the printed surface 2a to the non-printed surface 2b. Therefore, even if the outer circumferential surface of the target roll 6 contacts the non-printing surface 2b of the sheet 2 instead of the printing surface 2a (for example, see the receiving roll 6B shown in FIG. 4), from the printing surface 2a to the non-printing surface 2b. There is a possibility that the printing liquid seeped out may adhere to the outer peripheral surface of the target roll 6.

On the other hand, according to the above-mentioned antifouling device 1, even when the outer peripheral surface of the target roll 6 comes into contact with either the printed surface 2a or the non-printed surface 2b of the sheet 2, the It is possible to suppress the adhesion of dirt to the outer circumferential surface of the target roll 6 due to the applied printing. Therefore, regardless of whether the embossing roll 6A or the receiving roll 6B is employed as the target roll 6, both processing accuracy and operating efficiency can be improved in the embossing unit 16.

[4. Modified example]
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 including an upper layer 2U and a lower layer 2L, the upper surface 2c of the upper layer 2U and the lower surface of the lower layer 2L are exposed in a laminated state in which the upper layer 2U and the lower layer 2L are stacked. 2d may also be a non-printing surface on which no printing is applied. In this case, either the lower surface 2e of the upper layer 2U or the upper surface 2f of the lower layer 2L, which is not exposed in the stacked state, may be used as the printing surface on which printing is performed. In FIG. 6, the printing unit 17 that prints on the lower surface 2e of the upper layer 2U is illustrated, and illustration of the antifouling device 1 is omitted.

As in this modification, if printing is performed on the non-exposed surface of a multilayer sheet 2', when single embossing is performed on this sheet 2' with the embossing unit 16, the outer peripheral surface of the target roll 6 and the sheet 2 Direct contact with the printed surface of ' can be avoided. Further, even when double embossing is performed on the sheet 2', direct contact between the outer circumferential surface of the target roll 6 and the printed surface of the sheet 2' can be avoided. Therefore, adhesion of the printing liquid to the outer peripheral surface of the target roll 6 can be further suppressed. Therefore, dirt on the target roll 6 can be reduced, and cleaning time and cleaning frequency can be reduced, and when processing a single embossing, a better effect can be obtained than when processing a double embossing.

Furthermore, even when printing is performed on the lower surface 2e of the upper layer 2U as in this modification, the printing that is usually visible from the upper layer 2U side (surface side) (if the basis weight is ^about 10 to 20 g/m2) The visibility is equivalent to that when printing is performed on the upper surface 2c of the upper layer 2U. On the other hand, when printing is performed 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. Although an antifouling effect can be obtained, this is not preferable because the visibility of printing from the upper layer 2U side (front side) decreases.
Note that the sheet 2 may not be made of paper material. Further, the printing unit 17 described above may be provided at a location different from the conveyance 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.

1 Antifouling device 1A Storage section 1B Oil supply section 1C Diffusion section 2, 2' Sheet 2a Printing surface 2b Non-printing surface 2c Top surface 2d Bottom surface 2e Bottom surface 2f Top surface 2L Lower layer 2U Upper layer 3 Product 4 Production line 5 Log 5a Winding end 5c Core 6 Target roll 6A Emboss roll (roll)
6B Receiving roll (roll)
6c Outer circumferential surface 6d Outer circumferential surface 6e Concave portion 6f Convex portion 9 Package 10 Log forming part 11 Conveying line 12 Fabric roll 13 Winder 14 Gluing part 15 Sheet manufacturing device 16 Embossing unit 17 Printing unit 20 Adjusting part 21 Accumulator 30 Cutting part 31 Log saw 40 Packaging part 41 Packaging bag 42 Opening 50 Boxing part 51 Cardboard box 61 Cloth material 62 Spray 63 Brush material

Claims (10)

An antifouling device for an embossing unit that passes a printed sheet between a pair of rolls to form an embossing on the sheet,
a storage section that stores oil for antifouling;
An antifouling device comprising: an oil supply section that supplies the oil stored in the storage section to the outer circumferential surface of at least one of the pair of rolls, the target roll. The antifouling device according to claim 1, wherein the sheet has colored ink transferred thereto by the printing. The antifouling device according to claim 1 or 2, wherein the oil supply section applies the oil stored in the storage section to the outer circumferential surface of the target roll using a cloth material. The antifouling device according to claim 1 or 2, wherein the oil supply section sprays the oil stored in the storage section onto the outer circumferential surface of the target roll. The antifouling device according to claim 4, further comprising a diffusion section that uses a brush material to spread the oil sprayed by the oil supply section onto the outer circumferential surface of the target roll. The antifouling device according to claim 1 or 2, wherein the target roll includes an embossing roll having unevenness formed on the outer peripheral surface. The antifouling device according to claim 1 or 2, wherein the target roll includes a roll in which no unevenness is formed on the outer peripheral surface. The antifouling device according to claim 1 or 2,
An embossing unit comprising: the pair of rolls. The embossing unit according to claim 8, which is provided on a conveyance line through which the long sheet is conveyed;
A sheet manufacturing apparatus comprising: a printing unit that is provided upstream of the embossing unit in the conveyance line and performs the printing on the sheet. An antifouling method for an embossing unit in which a printed sheet is passed between a pair of rolls to form an embossing on the sheet, the method comprising:
An antifouling method comprising the step of supplying antifouling oil to the outer peripheral surface of the target roll, which is at least one of the pair of rolls.

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