JP5622478B2 - Manufacturing method of tissue paper products - Google Patents

Description

  The present invention relates to a method for manufacturing a tissue paper product, and more particularly to a method for manufacturing a tissue paper product in which a tissue paper to which an aqueous chemical solution is applied is stored in a storage box.

  Folding machines that form tissue paper bundles that make up tissue paper products are broadly divided into multi-stand type interfolders and rotary type interfolders.

  The multi-stand type has a high processing capacity and is suitable for mass production of general-purpose products. The rotary type is relatively small, easy to switch base paper, and has good folding quality such as sheet folding. Suitable for production of high value-added products of lots.

  For this reason, rotary interfolders with good folding quality are used to produce lotion tissue, which is a high value-added product whose consumption has increased in recent years.

  The rotary type interfolder is operated at about 80 to 100 m / min, and when producing lotion tissue, an aqueous chemical solution mainly composed of polyol is applied on the secondary raw sheet by gravure method or flexo method. Alternatively, folding is performed using the original fabric coated by these printing methods.

  However, recently, high-speed rotary interfolders of a type that can be processed at a speed of 150 to 300 m / min have begun to be put on the market.

  This high-speed rotary interfolder has a large number of rolls for cutting continuous sheets, rolls for conveyance, rolls for folding, etc., as shown in FIG. The rolls are arranged and the seat run has a long and complicated structure.

More specific features of the high-speed rotary interfolder X5 are as follows (1) to (4).
(1) The cut sheet S ″ is formed on the surface of each roll at the time when the continuous sheet S ′ is cut by the preceding knife roll 611 and the bed roll 610 and at each of the subsequent rolls 620 and 630 after that. It is configured to be held on the surface of each roll by suction through the vacuum holes 678 and 679, and the variation in the sheet tension is small when the continuous sheet S ′ is cut. There is no influence on the sheet conveyance, and there is no influence in the folding process.
(2) Each roll is driven by a servo motor, and the acceleration / deceleration of each roll when the knife roll 611 is cut can be appropriately changed according to factors such as the ease of sheet elongation and tensile strength. Yes.
(3) The pressure roll 612 is installed on the receiving roll of the knife roll 611. When the continuous sheet S ′ is cut by the knife roll 611, the pull roll 613 holds the pressure roll 611 and the continuous sheet S ′ by a servo motor. The sheet tension is accurately controlled by the combined use with the vacuum hole of (1), and the continuous sheet S ′ is not pulled back during sheet cutting.
(4) The intermediate roll 620 having a long nip time has two vacuum sources (not shown), one of which is responsible for suctioning the front and rear ends of the cut sheet S ″, and the other is the cut sheet S ″. 3 to 10 vacuum ports in the CD direction (width direction of the cut sheet S ″, that is, the axial direction of the roll). The sheet is densely arranged about 230 mm, and the sheet is not displaced due to centrifugal force or wind caused by rotation.

<Problems (Issues) in Improved Rotary Interfolder>
When an aqueous chemical solution containing polyol as a main component is applied and folded by a rotary interfolder, the operation is greatly affected by the increase in moisture and moisture absorption of the sheet coated with the aqueous chemical solution.

  There is no problem with the conventional low-speed rotary type interfolder, but when performing high-speed processing, the conventional simple on-line coating causes cut dimension failure and folding failure.

  This is due to the fact that in the high-speed interfolder, the sheet tension in the MD direction is higher than that in the conventional low-speed interfolder.

  That is, an aqueous chemical solution containing a polyol as a main component contains moisture, and the moisture absorption of the coated sheet is increased, so that the moisture content of the sheet is increased. Therefore, it is easy to extend compared with a non-application sheet | seat, the rigidity of a sheet | seat falls and intensity | strength falls. If the sheet is supplied into the interfolder in this state, there is no problem in the case of the conventional low-speed processing speed. However, in the case of high-speed processing, the sheet tension is high, so that the elongation in the MD direction is large. As a result, tension fluctuations during cutting are large, and even with the above-described speed-up characteristics, cut dimension defects and folding defects occur.

  In addition, since the sheet return in the MD direction at the time of cutting is short, that is, the sheet remains fully stretched, the sheet sags unevenly (wavy), and is conveyed on the roll surface with wrinkles. The risk of losing is increased. In addition, the high-speed rotary interfolder is characterized by holding the vacuum of the sheet as described above.However, in the sheet coated with lotion, the sheet sags unevenly (ripples) due to the elongation, and wrinkles occur. As a result, the suction holding force by the vacuum port is different in plan, and the possibility that the sheet is displaced or travels obliquely with respect to the traveling direction increases. And it becomes easy to generate | occur | produce the folding defect at the time of folding by this.

  On the other hand, as another problem of applying an aqueous chemical solution with a high-speed rotary interfolder, the tissue paper sheet is made of hydrophilic pulp fiber, and an aqueous chemical solution is applied with such a high-speed rotary interfolder. When the processed sheet is processed, the high-speed rotary interfolder has a high tension applied to the sheet, so that the sheet is pulled in the MD direction and the crepe is stretched. Therefore, it becomes a product with no thickness. Since lotion tissue is a high-value-added product, thickness is an important quality, but it is extremely difficult to express thickness with a high-speed rotary interfolder.

JP 2008-245780 A JP 2003-325372 A Japanese Patent Application Laid-Open No. 2004-332034 Special table 2008-525103 gazette JP 2008-264564 A US Patent No. 4052048 (Japanese Patent Publication No. 55-1215) JP 2006-240750 A JP 61-37668 A Japanese Patent Laid-Open No. 5-124770 JP 2008-183411 A US Patent US7455231B2

  Accordingly, an object of the present invention is to provide a structure of a rotary interfolder suitable for aqueous chemicals and capable of operating at high speed, and a method for efficiently producing aqueous paper solution type tissue paper products using aqueous chemicals with high productivity. provide.

Means for solving the above problems and their effects are as follows.
[Invention of Claim 1]
A method of manufacturing tissue paper products using a rotary interfolder,
Conveying a continuous sheet of crepe paper;
A cutting process for cutting the tissue sheet into a size of tissue paper while holding the continuous sheet on the roll;
An aqueous chemical solution containing water and polyol is applied to one surface of the sheet held on the roll after the cutting by a non-contact coating method, and further, the aqueous chemical solution is applied to the one surface after cutting. Non-contact type water-based chemical solution containing water and polyol with respect to the other side of the sheet held on the second-stage roll in a state in which both outer surfaces of the sheet are exchanged and transferred to the latter-stage roll. An aqueous chemical solution application step of applying an aqueous chemical solution on both sides of the sheet after cutting,
And a step of folding the sheet coated with the aqueous chemical solution.

[Invention of Claim 2 ]
The non-contact coating method, an inkjet printing method or rotor dampening spray method method for producing a coating method a tissue paper according to claim 1, wherein the.

[Invention of Claim 3 ]
The method for producing tissue paper according to claim 1 or 2 , wherein the aqueous chemical liquid contains a polyol as a main component and contains 1 to 15 mass% of water.

[Invention of Claim 4 ]
The method for producing tissue paper according to any one of claims 1 to 3 , wherein the aqueous chemical solution has a viscosity of 1 to 700 mPa · s.

  Since the aqueous chemical solution is applied to the sheet after cutting instead of applying the aqueous chemical solution to the continuous sheet, it is not necessary to take into account the tension fluctuation at the time of cutting, so that no cutting failure occurs.

  Further, since the aqueous chemical solution is applied on the roll of the folding mechanism unit, the time from the application of the aqueous chemical solution to the folding process is shortened, and the possibility of occurrence of folding failure due to a decrease in sheet rigidity is remarkably reduced.

  Furthermore, by applying the aqueous chemical solution after cutting and shortening the time until the folding process, the paper thickness of the sheet is not impaired, and the web bulk is easily produced, and a thick and high-quality tissue paper product can be obtained.

  In addition, since it is possible to apply the required amount of aqueous chemical solution to the required location in a non-contact manner, the amount of the coating applied to the lead portion at the front end of the sheet is relatively reduced, etc. When traveling on the roll, the risk of the aqueous chemical solution being applied to or adhering to the roll can be greatly reduced, so that there is little roll contamination and the yield of the aqueous chemical solution is high.

  Furthermore, the inkjet printing method or rotor dampening spray method application method can apply a water-based chemical solution uniformly with flying particles to the plane of the sheet, even in a non-contact application method. The risk is greatly reduced, and it is possible to produce a good-looking tissue paper product without defects.

It is a perspective view of the tissue paper product concerning this invention. It is a perspective view of the use condition of the tissue paper product concerning this invention. It is the III-III sectional view. It is the schematic which shows the manufacturing equipment and manufacturing method of a primary web roll. It is the schematic which shows the manufacturing equipment and manufacturing method of a secondary web roll. It is the schematic of the example of an installation of the rotary type | formula interfolder concerning this invention. It is a figure which shows the folding mechanism part example 1 concerning this invention. It is another figure which shows the folding mechanism part example 1 concerning this invention. It is a figure which shows the folding mechanism part example 2 concerning this invention. It is a figure which shows the folding mechanism part example 3 concerning this invention. It is a figure for demonstrating the case where a water-system chemical | medical solution is apply | coated to both surfaces of the sheet | seat concerning this invention. It is a principal part enlarged view of an inkjet printer. It is a perspective view of the inkjet head of an inkjet printer. It is the schematic which shows a spray coating apparatus. It is the schematic which shows a spray coating apparatus. It is the schematic which shows a loader dampening application | coating apparatus. It is another schematic diagram showing a loader dampening coating apparatus. It is explanatory drawing of a storage process. It is explanatory drawing of the conventional high-speed rotary type | formula inter folder.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
"Tissue paper products"
1 to 3 illustrate a tissue paper product X1 according to the present invention. In the tissue paper product X1 according to the present invention, a bundle of tissue paper 10 in which a plurality of tissue papers 1 are folded and overlaid is provided in a storage box 2 in which an outlet or an outlet forming portion 21 is formed on the upper surface 2U. When a set of tissue paper 1 is taken out from the outlet when stored and used, a part of a pair of lower layers stacked adjacent to each other is exposed from the outlet. One set here refers to a cut sheet unit of tissue paper, and consists of single-layer or multi-layer crepe paper.

[Storage box]
A storage box 2 in which a bundle 10 of tissue paper 1 is stored is a rectangular parallelepiped box called a carton box. The storage box 2 has a product appearance, and has an annular perforation line 21 as an outlet forming portion 21 on the upper surface 20U as shown in FIGS. 1 and 2 showing the tissue paper product X1. A paper box 20 and a resin film 22 that covers a range 21 a surrounded by the perforation line 21 from the inside of the paper box are provided.

The paper box 20 is a paper box that forms the outline of the storage box, and the construction of the paper box of the known storage box is adopted for the size, shape, developed shape, and the like.
As the shape, a hexahedron shape having a rectangular upper surface 2U constituted by a pair of parallel long edges 20L, 20L in the illustrated example and a pair of parallel short edges 20S, 20S shorter than these can be exemplified, As its structure, the upper surface 2U, the bottom surface (not shown), the side surface 2S connecting them, the bottom surface side end surface piece 23B, the side surface end surface piece 23S, and the upper surface side end surface piece 23U connected to both side edges in the longitudinal direction of each surface. The side surface end piece 23S is folded back to the inner surface side of the box, and then the upper surface side end surface piece 23U and the bottom surface side end surface piece 23B are folded to overlap each other, and the contact portion of each piece is a hot melt adhesive or the like A structure constituted by bonding can be exemplified.

  The size of the storage box 2 is slightly larger than the bundle 10 of the tissue paper 1 and is an inner shape that is approximately 1 to 20 mm larger than the outer shape of the bundle 10. When the size of the general storage box 2 is exemplified, the longitudinal edge is generally 110 to 320 mm, the short edge is 70 to 200 mm, and the height is about 40 to 150 mm. Even at least in the present invention, the storage box 1 having this size can be used.

As a material of the paper box 20, for example, a known paper material mainly using various pulps such as virgin pulp and waste paper pulp can be adopted. Preferably, the material of the paper box is a coated cardboard having a basis weight of 250 to 500 g / m ² , preferably 350 to 400 g / m ² .

  Note that the paper box is not shown in the figure, but a single character, figure, picture, symbol, or a combination thereof, such as a floral pattern, spiral pattern, wave pattern, dot pattern, turtle shell pattern, star pattern, cross pattern, geometric pattern, etc. The appropriate pattern comprised by can be employ | adopted. The pattern can be applied to the outer surface of the paper box by a known printing method such as gravure printing.

  On the other hand, the perforation line 21 formed on the upper surface 2U of the paper box 20 has an annular shape, is formed by a known method and a cut tie ratio, and a specific shape in a range surrounded by this is not necessarily limited. However, in the present invention, the storage box 2 is typically an approximately oval shape or a rectangle having a long side in the direction along the longitudinal direction of the upper surface of the paper box, as shown in the drawing, and has high take-out and convenience. This shape, which can be produced on many existing production lines, is preferred.

  On the other hand, the resin film 22 is larger than the size of the range surrounded by the perforation line, and is, for example, a rectangle or an ellipse, and does not particularly affect the peeling of the annular perforation line 21 on the inner surface side of the upper surface of the paper box. Further, it is bonded to the outside of the annular perforation line 21. A suitable material for the resinous film 22 is a polyethylene film, but examples thereof include polypropylene and polyester.

  The thickness of the resin film 22 is suitably 10 to 200 μm. If the thickness is less than 10 μm, the strength is insufficient, and the probability of tearing or breaking when the tissue paper 1 is taken out increases. On the contrary, if it exceeds 200 μm, there is no problem of strength, but it becomes difficult to take out and the cost is increased.

  On the other hand, a slit 24 is formed in the resin film 22, and the slit 24 is located in a range surrounded by the perforation line 21.

  Therefore, as shown in FIGS. 1 and 2, by cutting off the range 21a surrounded by the perforation line 21 along the annular perforation line, an outlet is formed on the upper surface 2U of the paper box, and the resin film 22 is formed. And the slit 24 formed in it is exposed through the outlet 25. In addition, the length of the said slit 24 can be made into an appropriate length, and the length considered suitable by the magnitude | size relationship with the known annular perforation line 21 is employable.

  The tissue paper 1 stored as a bundle in the storage box 2 is taken out one by one from the outlet 25 through the slit 24. The slit 24 supports a part of the tissue paper exposed from the outlet 25 and prevents the tissue paper from falling into the carton box.

[Basic structure of tissue paper bundle]
A bundle 10 of tissue papers 1 of the present invention is formed by folding and stacking tissue papers 1. More specifically, as can be understood from FIG. 3, the square tissue paper 1 is substantially folded in two so that the edge 1e of the folded piece is located on the folded inner surface of the tissue paper adjacent to the top and bottom. Thus, they are stacked while alternately overlapping. Here, the term “substantially” means that a slight fold of the edge formed in manufacturing is allowed.

  In the stack 10 of tissue paper 1 having the present laminated structure, when one folded piece located at the uppermost position is pulled upward, the other folded piece immediately below it is pulled upward by friction and lifted. It is done. The bundle 10 of tissue paper 1 having such a structure is stored with its uppermost surface facing the upper surface of the storage box 2 having the outlet 25 or the like on the upper surface 2U described above, and from the outlet 25, particularly the slit 24. When the first set (the set on the top surface) is drawn, a part of the other set located immediately below is exposed. Note that the number of tissue papers 1 in the present invention is not limited, but a typical number of tissue papers of this type is 120 to 240.

“Production of tissue paper products”
Next, a characteristic manufacturing method according to the present invention of the tissue paper product X1 will be described.
[Paper making process [Production method and equipment for primary roll]]
The manufacturing method of the continuous sheet concerning this invention is demonstrated.
First, a primary sheet roll JR (also referred to as a jumbo roll) is manufactured as follows using the papermaking facility example X2 shown in FIG.

  An appropriate chemical is added from the head box 31 to the pulp slurry, and a paper stock prepared in advance is supplied onto the wire 32w of the wire part 32 to form the wet paper W (forming process), and then the wet paper W is pressed. After being transferred to the felt 34 of the part 33, it is sandwiched and dehydrated by the pair of dewatering rolls 34 and 35 (dewatering step).

  Next, the dehydrated wet paper is attached to the surface of the Yankee dryer 36 and dried, and then scraped off by the doctor blade 37 to obtain a dry base paper S1 having a crepe (corresponding to a primary continuous sheet described later) (drying step).

  Then, the dried base paper S1 is wound by a winding means 38 having a winding drum 39 so that the back surface of the dried base paper S1 faces the shaft side of the primary raw roll JR (so that it becomes the winding inner surface). Take the primary roll roll JR (primary roll take-up step).

  Although this primary web roll JR differs depending on the performance of the papermaking equipment X2, the diameter is generally 1000 to 5000 mm, the length (width) is 1500 to 9200 mm, and the winding length is 5000 to 80000 m.

  In addition, a calendar process (not shown) may be provided on the dry base paper S1 that has been scraped off by the doctor blade 37 before the primary web winding process to smooth the front and back surfaces.

  Here, the back surface of the dry base paper S1 means a surface opposite to the surface that is in contact with the cylinder of the Yankee dryer 36. Although depending on the presence or absence of the calendar process, the surface in contact with the mirror Yankee dryer is generally smoother and has better surface properties.

Here, the primary continuous sheet S1 constituting the primary web roll JR is processed into the tissue paper 1 later, and the basis weight equivalent to the base paper basis weight before applying the chemical solution of the tissue paper 1 constituting the final product. (In the case of later lamination, 1 / basis weight of the number of laminations). Accordingly, in consideration of this, the primary raw sheet S1 specifically has a basis weight according to JIS P 8124 of 10 to 25 g / m ² , preferably 12 to 20 g / m ² , more preferably 13 to 16 g / m ^2. And When the basis weight is less than 10 g / m ² , it is preferable in terms of the softness of the tissue paper 1, but it becomes impossible to ensure an appropriate strength. On the other hand, if the basis weight exceeds 25 g / m ² , the tissue paper 1 becomes too hard and the touch is deteriorated. The paper thickness (measured with a Peacock manufactured by Ozaki Seisakusho) is 80 to 250 μm, preferably 100 to 200 μm, more preferably 130 to 180 μm.

As a measuring method of the paper thickness, it shall be measured using a dial thickness gauge (thickness measuring instrument) “PEACOCK G type” (manufactured by Ozaki Seisakusho) under the conditions of JIS P 8111 (1998). Specifically, confirm that there is no dust, dust, etc. between the plunger and the measuring table, lower the plunger on the measuring table, move the memory of the dial thickness gauge to adjust the zero point, and then Raise the plunger, place the sample on the test bench, slowly lower the plunger and read the gauge at that time. At this time, only the plunger is placed. The terminal of the plunger is made of metal so that a plane with a diameter of 10 mm is perpendicular to the plane of the paper, and the load at the time of measuring the paper thickness is about 70 gf. The paper thickness is an average value obtained by performing measurement 10 times.

The primary continuous sheet S1 has a crepe rate of 10 to 30%, preferably 12 to 25%, more preferably 13 to 20%. The crepe rate is defined as follows.
Crepe rate: ((peripheral speed of the dryer during papermaking) − (peripheral speed of the reel)) / (peripheral speed of the dryer during papermaking) × 100.

  When the crepe rate is less than 10%, the tissue paper 1 is easy to break during subsequent processing and has little stretch and is not stiff. On the other hand, if the crepe rate is more than 30%, it is difficult to control the tension of the sheet at the time of processing, and it becomes easy to break the paper. That is, it is difficult to fold the rotary interfolder according to the present invention.

  Further, the primary continuous sheet S1 has a dry tensile strength (hereinafter also referred to as dry paper strength) specified in JIS P 8113 of 2 to 200 p-200 cN / 25 mm, preferably 250 to 600 cN / 25 mm. The lateral direction is preferably 300 to 600 cN / 25 mm, and the lateral direction is 100 to 300 cN / 25 mm, preferably 130 to 270 cN / 25 mm, particularly preferably 150 to 250 cN / 25 mm. If the dry tensile strength of the base paper is too low, troubles such as paper breakage and elongation at the time of production and use are likely to occur, and if it is too high, the touch becomes stiff when used.

  These paper strengths can be adjusted by a known method. For example, NBKP of raw material pulp that reduces the freeness (for example, about 30 to 40 ml) of paper stock by adding a dry paper strength enhancer to the stock or wet paper. Known techniques such as increasing the blending ratio (for example, 50% or more) can be appropriately combined.

  As the dry paper strength agent, starch, polyacrylamide, CMC (carboxymethyl cellulose) or a salt thereof such as sodium carboxymethyl cellulose, carboxymethyl cellulose calcium, carboxymethyl cellulose zinc and the like can be used. As the wet paper strength agent, polyamide polyamine epichlorohydrin resin, urea resin, acid colloid / melamine resin, thermal crosslinkability imparting PAM and the like can be used.

  When the wet paper strength agent is internally added, the addition amount can be about 5 to 20 kg / t in weight ratio to the pulp slurry. In addition, when the dry paper strength agent is internally added, the addition amount can be about 0.5 to 1.0 kg / t by weight ratio to the pulp slurry.

(Paper)
Here, the paper material used as the raw material of the primary raw roll (primary continuous sheet) will be described. The paper material is obtained by adding an appropriate chemical to a slurry (pulp slurry) containing pulp as a main raw material as a fiber raw material.

  In the present invention, the raw material pulp is not particularly limited, and an appropriate raw material pulp used for this type of tissue paper can be selected and used. Specific examples include wood pulp, non-wood pulp, synthetic pulp, waste paper pulp, and more specifically, groundwood pulp (GP), stone grand wood pulp (SGP), refiner grand wood pulp (RGP), pressure type Mechanical pulp (MP), chemical mechanical pulp (CGP), semi-chemical pulp such as groundwood pulp (PGW), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), bleached chemithermomechanical pulp (BCTMP) (SCP), hardwood bleached kraft pulp (LBKP), kraft pulp (KP) such as softwood bleached kraft pulp (NBKP), chemical pulp such as soda pulp (AP), sulfite pulp (SP), dissolved pulp (DP) (CP), nylon, rayon, polyester, polyvinyl alcohol Raw paper pulp such as synthetic pulp, deinked pulp (DIP), waist pulp (WP), waste pulp (TP), cotton, flax, hemp, jute, manila hemp, ramie, etc. One or several kinds can be appropriately selected and used from slag pulp, straw pulp, esparto pulp, bagasse pulp, bamboo pulp, kenaf pulp and other auxiliary pulps such as bast pulp.

  Among these, the raw material pulp is preferably a blend of NBKP and LBKP. Since it is compatible with aqueous chemicals, desirable in the production method of the present invention that is folded after application, and desirable in terms of the texture of the resulting tissue paper, it is preferable that it is composed only of NBKP and LBKP of virgin pulp, In this case, the blending ratio (JIS P 8120) is preferably NBKP: LBKP = 20: 80 to 80:20, and particularly preferably NBKP: LBKP = 30: 70 to 60:40. Moreover, although used paper pulp may be blended as appropriate, it is necessary to suppress the blending amount to such an extent that the tissue does not become hard.

  Examples of chemicals added to the stock include dry paper strength enhancers, wet paper strength enhancers, softeners, release agents, adhesives, pH adjusters such as caustic soda, adhesives, antifoaming agents, preservatives, slime control Agents, dyes, and the like. These chemicals may be applied to the wet paper in an appropriate process.

[Ply process [secondary roll roll manufacturing method and manufacturing equipment]]
The primary web roll JR produced by the papermaking equipment is transferred to the secondary web roll production equipment X3 (hereinafter also referred to as ply machine X3) shown in FIG. Process). Note that this ply processing can be omitted when a single-layer (one ply) tissue paper is used.

  The ply machine X3 can set two or more primary web rolls JR, and the primary continuous sheets (S11 and S12 in the illustrated example) fed from the primary web rolls JR and JR are laminated along the continuous direction. Then, it is configured so as to be supplied to the overlapping portion 51 as a laminated continuous sheet.

  Here, in the illustrated example, the surfaces of the primary continuous sheets S11 and S12 fed out from the respective primary raw rolls JR and JR are supplied to the overlapping portion 51 so as to be the surfaces of the laminated continuous sheets S2, respectively. It has become. In addition, the “surface” of the laminated continuous sheet S2 here means a laminated outer surface. You may comprise so that the back surface of primary continuous sheet S11, S12 may become the surface of lamination | stacking continuous sheet S2, respectively, either one back surface of primary continuous sheet S11, S12 may become the surface of lamination | stacking continuous sheet S2, and the other surface May be the surface of the laminated continuous sheet S2, but the surface of the primary raw sheet S11, S12 is in contact with the surface of the Yankee dryer during drying, so there is less fuzz compared to the back surface, and it is smooth and soft to the touch Therefore, it is desirable that the surface of the primary continuous sheet (dry base paper S1) constitutes both outer surfaces of the laminated continuous sheet S2.

  The ply machine X3 is provided with a winding means 56 for winding the laminated continuous sheet S2 into the secondary raw roll R after the overlapping portion 51. This winding means 56 has a pair of winding drums for winding the laminated continuous sheet S2 while guiding the continuous sheet S2 to the winding means 56. These two winding drums 56A and 56A come into contact with the outer peripheral surface of the secondary raw roll R to assist the winding while guiding the laminated continuous sheet S2.

  Here, in the ply machine X3, the slit means 55 is provided in the front stage of the winding unit 56, the laminated continuous sheet S2 is slit in the continuous direction, and an appropriate width is set in accordance with the processing width of the subsequent rotary interfolder. It is possible to adjust the width | variety of the secondary original fabric roll R suitably by winding up after doing. For example, slitting is performed so that the continuous side edge of the laminated continuous sheet S2 is cut and adjusted to an appropriate width obtained by adding a trim width of about 40 to 100 mm to multiple times of a tissue slit width processed by a rotary interfolder. can do.

  The width | variety of the secondary raw fabric roll R of this invention can be made into a suitable width | variety according to the roll width | variety which comprises a rotary type | system | group interfolder, ie, the processable width | variety. Generally, it is 800-4600 mm from the width | variety (150-250 mm) and productivity of tissue paper. Therefore, it can be slit to be in this range. In the rotary type interfolder, it is possible to have a trimming process after the knife roll online. Therefore, it is not always necessary to perform a slit or the like. Ideally, the width is substantially the same as the width of the primary raw roll JR. It is desirable to manufacture the secondary web roll R and to set it as it is on the web roll support section of the interfolder because the operation and equipment become simple. Therefore, it is desirable that no slit or the like is performed. The slit process may be provided only when necessary in relation to the secondary raw roll support portion of the interfolder, such as when the width of the primary raw roll JR is excessively large.

  In addition, in the manufacturing equipment X3 or the manufacturing method of the secondary web roll R according to this embodiment, the processing speed is 350 to 1100 m / min, preferably 700 to 1050 m / min, more preferably 900 to 1000 m / min. It is good. If it is less than 350 m / min, it cannot be said that sufficient productivity is obtained, and it is difficult to obtain the effect of producing a chemical-coated tissue paper, which is an effect of the present invention. On the other hand, if it exceeds 1100 m / min, stable production becomes difficult.

(Calendar processing)
On the other hand, in the ply machine X3, the laminated continuous sheet S2 can be calendered by providing one or more calendar parts 52 between the overlapping part 51 and the winding part 56.

  The type of calendar in the calendar unit 52 is not particularly limited, but is preferably a soft calendar or a chilled calendar for reasons of improving the smoothness of the surface and adjusting the paper thickness. The soft calendar is a calendar using a roll coated with an elastic material such as urethane rubber, and the chilled calendar is a calendar made of a metal roll.

  The number of calendar parts can be changed as appropriate. If there is a plurality of installations, it has the advantage that it can be sufficiently smoothed even if the processing speed is high. On the other hand, one installation has the advantage that it can be installed even if the space is small.

  When two or more calendar parts are installed, they can be arranged side by side in the horizontal direction, the up-down direction, or the oblique direction, and these installation directions can be combined. When arranged side by side in the horizontal direction, the holding angle becomes smaller, so the processing speed can be increased, and when arranged side by side in the vertical direction, the installation space can be reduced. The holding angle referred to here means an angle during which the sheet is in contact with the roll as viewed from the center of the roll axis (a part of an arc of a cross section perpendicular to the axis) (hereinafter the same).

  Paper making is also performed as control factors such as the calendar type, the nip line pressure, and the number of nips in calendar processing, and these control factors are preferably changed as appropriate according to the quality of tissue paper to be obtained, that is, the paper thickness and surface properties.

[Folding process [Tissue paper bundle manufacturing method and manufacturing equipment]]
As shown in FIG. 6, the secondary raw roll R manufactured by the ply machine X3 is rotatably attached to the raw roll support portion 80 of the rotary interfolder X4. Hereinafter, an example in which the secondary continuous sheet S3 fed out from the secondary raw roll R wound with the secondary continuous sheet S2 on which the continuous sheets are stacked will be mainly described. However, in the present invention, as described above. It is also possible to process the primary continuous sheet S1 by omitting the ply process and attaching the primary roll roll JR to the roll roll support 80 as it is.

  In this rotary type interfolder X4, the secondary continuous sheet S3 is unwound from the secondary original roll R attached to the original roll support section 80, and the folding mechanism section 85 applies an aqueous chemical solution to fold it. A tissue paper bundle 10 is formed.

(About the structure of the rotary interfolder)
Here, the present invention is a configuration that is remarkably effective when the rotary interfolder X4 is operated at high speed. Even in the slowest rotary type interfolder, high-quality aqueous chemical solution-coated tissue paper products with excellent coating quality are manufactured.

  Here, the high speed referred to in the present invention means that a continuous sheet is conveyed at a speed of at least 150 m / min. If it is determined by the relationship between the productivity of tissue paper products and the effect of the present invention, it is more preferably 250 m / min or more, and most preferably 280 m / min or more. There is an advantage in terms of productivity by setting it to 150 m / min or more. However, when it exceeds 300 m / min, it becomes difficult to stably fold the sheet coated with the aqueous chemical solution.

  The present invention has a remarkable effect in the rotary interfolder X4 that operates at a speed of 150 m / min or more, and the technology for achieving the high speed is not limited. As the speed-up technology of the rotary interfolder X4 that makes the effect of the above-mentioned effect remarkable, the configuration of the folding mechanism unit 85 has also been found, and therefore, the speed-up rotary interfolder having such a configuration will be described. Examples of the folding mechanism parts 1 to 6 of the rotary interfolder suitable for speeding up that can be suitably employed in the present invention will be described below.

<< Example 1 of folding mechanism of rotary interfolder >>
A folding mechanism part example 1 of the rotary interfolder according to the present invention will be described with reference to FIGS.

  The mechanism unit example 1 includes a pair of each of a bed roll 71, a knife roll 72, a wrap roll 73, a folding roll 75, and a pressure roll 76, and more preferably includes a tail roll 74 (rolls other than the folding roll in the figure). Only one is shown and the other is omitted).

  Each roll is driven by a servo motor, and the rotational speed and peripheral speed of each servo motor can be adjusted by electronic control to adjust the peripheral speed according to the tension of the sheet. This makes it possible to keep the sheet delivery timing between the rolls constant.

  The bed roll 71 holds the secondary continuous sheet S3 in the center direction of the secondary continuous sheet S3 while holding the tip of the secondary continuous sheet S3 with a nail or the like, or the tip of the secondary continuous sheet S3 through the vacuum hole 78. It is transported while being held on the roll surface (by the vacuum function in the example shown) by the vacuum function of sucking the ink and transferred to the subsequent roll.

  The knife roll 72 has a cutter blade 72C on its surface, rotates in a pair with the bed roll 71, and forms a secondary continuous sheet S3 conveyed on the bed roll 71 at an appropriate interval. The secondary continuous sheet S3 is cut in the sheet width direction by contacting. This cutting interval is the width (length) of the tissue paper product. The secondary continuous sheet S3 conveyed on the bed roll 71 is separated from the upstream secondary continuous sheet S3 by the contact of the knife roll 72 with the cutter blade 72C.

  The cut sheet S <b> 4 is conveyed while being held on the bed roll 71, and both outer surfaces are interchanged, and are transferred to the subsequent lap roll 73. The delivery can be exemplified by a technique in which the vacuum of the bed roll 72 is stopped when the bed roll 72 and the lap roll 73 are close to each other, and the lap roll 73 starts suction in the internal direction. Of course, a known delivery technology from roll to roll that can be adopted in the rotary interfolder can also be adopted.

  The pressure roll 76 sandwiches the leading end portion of the secondary continuous sheet S held on the bed roll together with the bed roll at the time of cutting. The presence of the pressure roll 76 increases the suction ability of the bed roll 71 while increasing the suction capacity. Even if the sheet is cut, the sheet does not flutter, and the secondary continuous sheet S3 is sucked onto the bed roll 71 from the front end to the rear end in order and securely held. Further, since the cutting with the knife roll 72 is performed in a state where the leading end portion of the secondary continuous sheet is sandwiched between the pressure roll 76 and the bed roll 71, the sheet at the time of the cutting is pulled backward (in the original roll direction). Is prevented, and fluctuations in tension can be effectively absorbed, and flapping of the sheet during cutting is also prevented.

  The wrap roll 73 conveys the cut sheet S4 delivered from the bed roll 72 while holding it on the surface, and rotates the front edge in the rotation direction of the conveyed sheet S4 at a speed lower than that of the wrap roll 73. Transition to the corresponding folding roll 75 is performed. For this delivery, a known technique such as stopping vacuum at the leading edge in the rotational direction of the sheet at a predetermined position, or jetting a gas, or a mechanical sheet gripping mechanism is adopted.

  In the illustrated wrap roll 73, vacuum holes 710 and 710 are formed so as to hold the front edge portion in the rotation direction of the sheet S4, the rear edge portion in the rotation direction, and two or more points therebetween. It can be held on the lap roll 73.

  Although not shown in the figure, the vacuum holes in the roll of the rotary type interfolder are, as is well known, arranged on the surface along the axial direction of the roll, and the present invention and the present specification. The vacuum hole in is constructed in that way. Therefore, the vacuum hole is formed so as to hold at least two points between the front end in the rotation direction and the rear end in the rotation direction. This means that a plurality of vacuum holes are arranged along the axial center direction. The number of holes is an appropriate design matter.

  The tail roll 74 provided as necessary is provided close to the wrap roll 73 and has a smaller diameter than the wrap roll 73 and the subsequent folding roll 75. In the tail roll 74, the trailing edge (tail) in the rotational direction of the sheet, in which the leading edge in the rotational direction has been transferred from the wrap roll 73 to the folding roll 75, is transferred, and the trailing edge in the rotational direction of the sheet is on its surface. Hold. The holding mechanism is the same as the above-described bed roll or the like.

  By shifting the rotational speed difference between the wrap roll 73 and the folding roll 75 described above and the front edge of the sheet S4 in the rotational direction to the folding roll, and then moving the rear edge (tail) in the rotational direction to the tail roll, A slack portion (also referred to as a bubble) St is primarily formed on the sheet S4 by the wrap roll 73, the tail roll 74, and the folding roll 75.

  Further, the transition of the leading end portion in the rotational direction of the sheet S4 from the wrap roll 73 to the folding roll 75 is performed on the tail roll 74 while the trailing edge portion in the rotational direction of the previous sheet forms a slack portion from the wrap roll 73. To be done.

  When the trailing edge in the rotational direction of the preceding sheet is transferred from the tail roll 74 onto the folding roll 75, the leading edge in the rotational direction of the subsequent sheet exists at that portion.

  Accordingly, when the sheet is completely transferred from the tail roll 74 to the folding roll 75, on the folding roll 75, below the trailing edge in the rotation direction of the previous sheet (on the folding roll side), the front of the subsequent sheet in the rotation direction. The edges are located and overlapped (wrapped).

  The folding roll 75 folds the sheet group partially overlapped. A pair of folding rolls 75 and 75 are close to each other, and similarly, a sheet group that is sent while overlapping a part of the pair of folding rolls is overlapped with its own sheet group. The sheet group is folded so that the edges of the sheets are pressed against each other at the mating portion.

  Thus, the high-speed rotary interfolder according to the present invention can improve the vacuum capacity of the lap roll 73 by separating the knife roll 72 and the bed roll 71 and the lap roll 73 that cut the sheet, Furthermore, speeding up is achieved by managing the speed of each roll individually by a servo.

  In addition, the slack portion is temporarily formed by the wrap roll 73, the folding roll 75, and the tail roll 74, so that the front sheet and the rear sheet are partially overlapped so that the part overlaps. By folding the sheet group with a folding roll, it becomes possible to operate at extremely high speed.

[Example 2 of folding mechanism of rotary interfolder]
FIG. 9 shows a second example of a folding mechanism for a rotary interfolder suitable for speeding up. This rotary interfolder has a bed roll 71, a knife roll 72, a first pull roll 78A, a second pull roll 78B, a delay roll 79A, a nip roll 79B, a lap roll 73A, and a count roll 73B, and a pair of foldings. It has rolls 75 and 75. If necessary, an appropriate restraining roll R is provided.

  The folding mechanism unit example 2 includes a first pull roll 78A and a second pull roll 78B that receive the secondary continuous sheet S3 in the first stage. The secondary continuous sheet S3 passes between these rolls while being nipped by the first pull roll 78A and the second pull roll 78B, and is supplied onto the bed roll while being nipped between the second pull roll 78B and the bed roll 71.

  The relationship between the bed roll 71 and the knife roll 72 is the same as that of the folding mechanism unit example 1 of the rotary interfolder. However, in the present embodiment, unlike the folding mechanism unit example 1, the knife roll 72 and the bed roll 71 are different. At the time of cutting the secondary continuous sheet S3, the rear side (raw roll side) of the secondary continuous sheet S3 is held by the nip between the second pull roll 78A and the bed roll 71 and the nip between the first pull roll 78A and the second pull roll 78B. Is done. Thereby, the sheet at the time of cutting is prevented from being pulled forward, the tension fluctuation can be effectively absorbed, and flapping of the secondary continuous sheet S3 at the time of cutting is prevented.

  Further, the sheet S4 cut by the knife roll 72 is conveyed while being held by the bed roll suction mechanism, and further conveyed by the bed roll to a subsequent roll.

  The roll immediately after the bed roll in this mechanism example 2 is a delay roll 79 </ b> A that rotates at a slower speed than the bed roll 71.

  Here, in this mechanism part example 2, the nip roll 79B exists at a position spaced apart from the nip position between the bed roll 71 and the delay roll 79A on the traveling direction side of the bed roll 71, and the nip roll 71 and the delay roll 79A. The nip roll 79B is positioned so as to be able to sandwich the sheet S4. With this configuration, when the sheet is delivered from the bed roll 71 to the delay roll 79A, first, the rotation direction front edge of the sheet S4 is first delivered from the bed roll 71 to the delay roll, and the rotation direction rear edge is once the nip roll 79B. After that, it is configured to sequentially nip with the delay roll 79A.

  Then, when the rotation direction trailing edge is transferred from the bed roll 71 to the delay roll 79A via the nip roll 79B, the rotation direction front edge of the subsequent sheet S4 is already from the bed roll 71 to the delay roll 79A. As a result, on the delay roll 79A, the leading edge in the rotational direction of the subsequent sheet is positioned below and overlapped (wrapped) below the trailing edge in the rotational direction of the previous sheet. Become.

  A wrap roll 73A to which the wrapped sheet is conveyed is present at the subsequent stage of the delay roll 79A. The overlapped sheet is advanced and transferred to the subsequent folding rolls 75 and 75 together with the count roll 73B. In the illustrated example, a pair of restraining rolls R and R are positioned in the middle of the wrap roll 73A and the folding rolls 75 and 75, and are configured to pass between them.

  Folding rolls 75, 75 having the same configuration are arranged in close proximity to each other, and the partially overlapped sheet group is transferred to the adjacent portion from above. The folding rolls 75 and 75 of the present example have a sheet holding mechanism including a grip mechanism (pick mechanism) that holds the sheet on each of the rolls 75 and 75 and a tacker mechanism, and a sheet S4 that is sent partially overlapped. A pair of folding rolls are alternately held by the sheet holding mechanism and transferred downward while the sheet front edge portion and the sheet rear edge portion are alternately placed at the close position.

  By transporting the sheet of each roll and holding / opening the edge at a predetermined position, a tissue paper bundle is formed below each folding roll.

  In the mechanism example 2 described above, a further increase in speed can be achieved by partial overlapping of the sheets by the delay roll, the nip roll, and the bed roll. Further, similarly to the first example of the mechanism unit, cutting, folding, and sheet superposition are separate processes, so that flapping of the sheet is prevented and the sheet can be reliably held on the roll surface.

  Of course, also in this mechanism part example 2, each roll can be controlled by a servo mechanism, and the suction force in the lap roll and bed roll can be increased. Also, the position of the vacuum hole in each roll can be suitably provided in the front end portion, the rear end portion, and the intermediate portion of the sheet, as in the first example of the mechanism portion. The mechanism part example 2 described above also achieves speeding up of the rotary interfolder.

<< Example 3 of folding mechanism of rotary interfolder >>
FIG. 10 shows an example 3 of a folding mechanism for a rotary interfolder suitable for speeding up.

  Similar to the folding mechanism unit example 1, the mechanism unit example 3 is configured to fold different secondary continuous sheets S3 from each other. In this example, since each roll group has a pair of left and right, only one of the common points will be described (in the figure, only one of the rolls other than the folding roll 25 is illustrated).

  First, in the folding mechanism unit example 3, the secondary continuous sheet S3 is conveyed to the first pull roll 78A, further drawn into the second pull roll 78B, and further delivered from the second pull roll 78B to the knife roll 72.

  Next, in the knife roll 72, the secondary continuous sheet S <b> 3 is sucked and held by the vacuum, and both outer surfaces are switched and transferred to the subsequent transfer roll 71 </ b> A.

  The knife roll 72 is provided with cutter blades at appropriate intervals, and the transfer roll 71A is provided with a receiving mechanism 71a for receiving the cutter blade at a position corresponding to the cutter blade.

  The cutter blade 72C cuts the secondary continuous sheet S3 from the knife roll 71 to the transfer roll 71A.

  The delivery from the knife roll 72 to the transfer roll 71A is performed by a vacuum suction difference. Further, the transfer roll 71A is provided with a groove 71b that holds the front edge of the sheet S4 in the rotation direction, and the front edge of the sheet S4 in the rotation direction is positioned and reliably held in this groove. The secondary continuous sheet S3 is cut so that the cutter blade 72C of the knife roll 72 enters the receiving mechanism 71a. As a result, the sheet S4 is cut and held.

  Furthermore, in the folding mechanism part example 3 of this example, a groove part 72a is formed between a plurality of cutter blades provided in the knife roll 72, and a protrusion 71c is formed on the transfer roll 71A. The protrusion 71c enters the 72a to form a crease in the sheet S4.

  Next, the sheet S4 is transferred from the transfer roll 71A to the folding roll 75 with both outer surfaces being switched. This transfer is performed by vacuum. Regarding the transfer of the sheet 75 from the transfer roll 71A to the folding roll, the edge portion of the sheet S located in the groove 71c of the transfer roll 71A is transferred to the folding roll 75 by the tucker mechanism and the vacuum.

  Further, the folding roll 75 has a groove 75a at the periphery, and a grip mechanism (pick mechanism) is formed there. And the protrusion part 71c of 71 A of transfer rolls is formed in the magnitude | size positional relationship of the roll so that it may enter into the groove part 75c of the folding roll 75. FIG. As a result, the sheet portion (the portion where the fold line is formed with the groove portion of the knife roll) located on the protrusion 71c of the transfer roll 71A enters the groove portion 75a of the folding roll 75, and at that time, the portion is formed by the grip mechanism. Is retained.

  The folding roll 75 rotates while holding the portion, and releases the sheet edge and releases the portion at a predetermined position. This predetermined position is determined by the relationship with the pair of folding rolls 75 and 75. For example, the grip mechanism is released at a position closest to the pair of folding rolls. At that time, the pair of folding rolls releases the sheet edge. By alternately releasing the folded portion and the edge portion at the proximity position of the pair of folding rolls 75, a tissue paper bundle is formed below the proximity position of the pair of folding rolls 75 and 75.

  In this mechanism unit example 3, the speed is increased by achieving the formation of fold lines and gripping / release of the sheet edge, discontinuity of folding and continuous sheet cutting, and enhancement of suction capability in the folding roll 75 and the transfer roll 71A. Is possible. Of course, also in this mechanism unit example, the peripheral speed of each roll is adjusted by a servo mechanism. Also, the position of the vacuum hole in the roll is appropriately provided in the front end portion, the rear end portion, and the intermediate portion thereof as in the first example of the mechanism portion. The other points such as the servo mechanism and the processing speed are the same as those in the mechanical unit examples 1 and 2.

《Summary of high-speed rotary interfolder》
As mentioned above, although the example of the folding mechanism part of the rotary type | system | group folder suitable for speeding-up was described, the rotary type | mold interfolder X4 of this invention is not limited to this example. Of course, as long as possible within the scope of the present invention, the configuration of each of the above examples can be changed with each other.

  In the present invention, in order to increase the speed of the rotary interfolder, the folding mechanism may be configured as follows.

  First, at the time when the sheet is cut with a knife roll or the like and thereafter, the sheet is held on the roll by a vacuum hole (vacuum suction port) provided on the surface of each roll while rotating each roll. Driving is performed by a servo motor, and the speed is adjusted and controlled. For example, sheet tension control at the time of cutting with a knife roll or the like at the time of acceleration / deceleration is performed according to the ease of elongation and tensile strength of each sheet. In this way, by adjusting the peripheral speed of each roll electronically with a servo motor or the like, the peripheral speed difference can be changed in accordance with the tension of the sheet, so that the sheet is held, the delivery timing, etc. is always constant. It becomes possible to maintain the speed, and it becomes possible to increase the speed. This is particularly effective in the case of a folding mechanism unit having a configuration with a large number of rolls.

  Next, the continuous sheet is cut using a knife roll or a cutter blade, and a pressure roll or a pull roll is installed to hold either or both of the front and rear end portions of the continuous sheet during cutting. . As a result, sheet misalignment at the time of cutting can be prevented and the speed can be increased. Furthermore, when the sheet is cut with a knife roll in combination with a servo motor, the speed can be further increased by accurately adjusting the difference in peripheral speed with each roll. In addition, when used together with the sheet holding by the vacuum hole, the sheet tension can be controlled more accurately and high speed operation becomes possible.

  Next, the sheet cut by the vacuum or the like is conveyed from the roll to the roll so as to be stuck on the roll after the sheet is cut by the knife roll or the like until just before being folded. As a result, there is no sheet displacement, and it is possible to fold the sheet cleanly at high speed. (Even when a part of the cut sheet is overlapped, the front and rear end portions of the sheet are held, and most other portions are in contact with the roll and the formation of the sheet is constant.)

  Next, the front and rear ends of the cut sheet are provided by providing a plurality of vacuum holes in an intermediate roll (transfer roll, delay roll, lap roll) with a long nip interval, and further using two or more vacuum areas and vacuum sources. The suction force between the front and rear ends of the cut sheet is controlled. In this case, if vacuum holes (vacuum suction ports) with a diameter of several millimeters are evenly spaced at 3 points in the MD direction and evenly spaced by 5-30 holes / 100-200 mm in the CD direction, they are positioned by wind due to centrifugal force or rotation. There is no deviation, and the accuracy of delivery of the cut sheet between the rolls is increased, and the speed can be increased. This increases the retention of the sheet on the roll and enables high speed operation.

(Description of water-based chemical application process)
Next, the aqueous chemical solution coating process will be described characteristically of the present invention. In the present invention, the aqueous chemical solution is applied by the folding mechanism portion 85 of the rotary interfolder X4. In particular, the chemical solution is applied after cutting the secondary continuous sheet.

  If it demonstrates concretely, if it says in the above-mentioned folding mechanism part examples 1-3, in FIGS. 7-10 which show each said folding mechanism part example, the non-contact-type application | coating means is shown by the codes | symbols 81 and 82. FIG.

  After the conveyed secondary continuous sheet S3 is cut on the bed roll 71, the transfer roll 71A or the folding roll 75 described above, the cutting held on the bed roll 71, the wrap roll 73A, the transfer roll 71A or the folding roll 75 An aqueous chemical solution is applied to the non-contact coating on the subsequent sheet S4 from the non-contact type application means arranged facing the roll.

  Here, the non-contact type coating method refers to applying a water-based chemical solution to a contact body such as a roll, such as flexographic printing, gravure printing, roll coating, etc., and then bringing the contact body into contact with the sheet surface to apply a water-based chemical solution. It does not mean an application method in which an aqueous chemical solution is directly applied to a sheet. Typically, it is an aqueous chemical solution coating method such as spray coating or ink jet printing.

  In such a non-contact coating method, no paper dust is generated because no roll or the like is brought into contact with the sheet.

  The non-contact coating method that is preferably employed is equipment installation cost, spray application by a rotor dampening spraying method that can reduce the equipment installation area, and management of drug application amount, application area, and application pattern. This is an inkjet printing method that is highly accurate and less likely to cause unevenness. A specific description of a suitable non-contact type chemical solution applying means will be described later.

Here, in the aqueous chemical solution application step, the total amount applied to both outer surfaces of the aqueous chemical solution applied to the sheet (including the laminated sheet) is 1.5 to 5.0 g / m ² , preferably 2.0 to 4. 0 g / m ² . If it exceeds 5.0 g / m ² , even if the method of the present invention is used, it may interfere with operability such as paper breakage due to a decrease in paper strength or elongation when operating at high speed, and the paper thickness and web quality may be affected. There is an increased risk that the bulk will decrease. There are also cases where the stickiness is too high. If it is less than 1.5 g / m ² , the quality difference from the uncoated product such as smoothness and moistness cannot be felt.

  In the present invention, when the aqueous chemical solution is applied to both outer surfaces of the sheet, it is basic to apply substantially the same amount of aqueous chemical solution on both outer surfaces (that is, 1/2 of the total application amount is applied to one surface). However, depending on the difference in the crepe shape on both outer surfaces of the secondary raw sheet, the difference in factors such as a feeling of friction, other operations, and quality, the amount of aqueous chemical solution applied on both outer surfaces may be different.

≪About double-sided coating and single-sided coating≫
Here, with respect to the sheet after cutting, it may also be coated with a water-based chemical solution only on one side, for application to both surfaces is desired. In particular, as described above, when a continuous sheet is formed by laminating a plurality of primary continuous sheets S1, S1 by the ply machine X3 to form a secondary continuous sheet S2, it is desirable to apply aqueous chemicals to both outer surfaces.

  When the aqueous chemical solution is applied to both surfaces of the laminated sheet S4, as shown in FIG. 11, the aqueous chemical solution is applied in a non-contact manner to the sheet S4 held on the pre-stage roll A after cutting. The sheet applied by the method, and further, the sheet after cutting with the aqueous chemical solution applied to one side thereof is transferred to the rear roll B so that the other side is the outer side, and the sheet held on the rear roll B in that state. For S4, the aqueous chemical solution is applied again by a non-contact application method.

  If it demonstrates in the above-mentioned folding mechanism part example 1, after cutting the secondary continuous sheet S3 with the bed roll 71 and the knife roll 72, it is non-contact type with respect to the cut sheet S4 hold | maintained on the bed roll 71 After the sheet S4 is applied to the lap roll 73 so that the other side is on the outside, the sheet S4 held on the lap roll 73 is applied to the sheet S4. Then, another non-contact type application means 82 applies the aqueous chemical solution again in a non-contact manner.

  In addition, the technique of delivering from the front roll A to the rear roll B so that the other surface is outside is provided for each roll such as the delivery method from the bed roll 71 to the wrap roll 73 described in the folding mechanism unit example 1 above. In addition, suction / exhaust / stop control through the vacuum hole, or mechanical sheet gripping / releasing technology provided on each roll can be employed. Of course, it is possible to use a roll-to-roll delivery technique employed in a known inter-folder.

  Here, the relationship between each of the examples 1 to 3 of the folding mechanism portion of the rotary interfolder X4 according to the present invention and the application to both outer surfaces will be described. First, the folding mechanism portion example 1 and the folding mechanism. Part 3 has a configuration that can be applied to both outer surfaces. That is, the folding mechanism unit example 1 can be applied in a non-contact manner while the sheet S4 is held on the bed roll 71 and the wrap roll 73. In the folding mechanism unit example 3, the bed roll 71 and the folding roll 75 can be applied to each other. Non-contact application of water-based chemicals is possible. With regard to the folding mechanism example 2, the front and rear sheets S4 partially overlap each other when moving from the bed roll 71 to the lap roll 73A, and thus cannot be applied to both outer surfaces. However, if a roll having the same sheet holding property as the bed roll 71 is interposed between the bed roll 71 and the wrap roll 73, it is possible to apply to both outer surfaces.

  Of course, the folding mechanism portion of the rotary interfolder X4 according to the present invention is not limited to the folding mechanism portion examples 1 to 3 described above, and constitutes the folding mechanism portion so as to enable application to both outer surfaces. The number of rolls may be increased. As described above, since the speed of the rotary interfolder can be achieved by improving the holding performance of the sheet to the roll by servo and suction efficiency, or by separating the continuous sheet from cutting and folding, having such a configuration, Appropriately, application to both outer surfaces can be performed as a folding mechanism part to which one or a plurality of rolls for making one outer surface of the cut sheet as an inner surface and at the same time the other inner surface as an outer surface are added.

  In addition, when apply | coating to both outer surfaces, the chemical | medical solution application | coating system of one side and the other side does not necessarily need to be the same. Spraying can be performed with the former roll A, and inkjet printing with the latter roll B.

≪About aqueous chemicals≫
Next, an aqueous chemical solution used in the present invention will be described. The aqueous chemical solution in the present invention contains water and a polyol, and particularly preferably contains 70 to 90% polyol, 1 to 15% moisture, and 0.01 to 22% functional chemical.

  Moreover, when using the said aqueous | water-based chemical | medical solution in the aqueous | water-based chemical | medical solution coating method of this invention, the aqueous | water-based chemical | medical solution temperature at the time of aqueous | water-based chemical | medical solution application | coating is 30 to 60 degreeC, Preferably it is preferable to set it as 35 to 55 degreeC.

  For this reason, as a water-system chemical | medical solution, it is desirable for the viscosity in 40 degreeC to be 1-700 mPa * s. More preferably, it is 50-400 mPa * s (40 degreeC). If it is less than 1 mPa · s, the aqueous chemical solution is likely to scatter, and conversely if it is greater than 700 mPa · s, it becomes difficult to control the coating amount to be stable.

  Examples of the polyol include polyhydric alcohols such as glycerin, diglycerin, propylene glycol, 1,3-butylene glycol, polyethylene glycol, and derivatives thereof, and sugars such as sorbitol, glucose, xylitol, maltose, maltitol, mannitol, and trehalose. It can be illustrated.

  Of the above components, it is preferable to use a polyhydric alcohol such as glycerin or propylene glycol as a main component in order to stabilize the viscosity and coating amount of the aqueous chemical solution.

  Examples of the functional agent include softeners, surfactants, inorganic and organic fine particle powders, and oily components. Softeners and surfactants have the effect of imparting flexibility to the tissue paper and smoothing the surface, and anionic surfactants, cationic surfactants and zwitterionic surfactants are applied. Inorganic and organic fine particle powders have a smooth surface. The oil component has a function of improving lubricity, and higher alcohols such as liquid paraffin, cetanol, stearyl alcohol, and oleyl alcohol can be used.

  In addition, as a functional agent, one or more of a hydrophilic polymer gelling agent, collagen, hydrolyzed collagen, hydrolyzed keratin, hydrolyzed silk, hyaluronic acid or a salt thereof, ceramide, etc. are optionally selected as agents that maintain the moisture retention of polyol. A moisturizer such as a combination of the above can be added.

  As functional agents, emollients such as fragrances and various natural extracts, vitamins, emulsifiers that stabilize compounding ingredients, antifoaming agents, antifungal agents, organic acids, etc. An odorant can be appropriately blended. Furthermore, you may contain the antioxidant of vitamin C and vitamin E.

≪Inkjet printing system≫
Next, an example in which an ink jet printer 130 is used as the non-contact type liquid chemical coating means 81 and 82 according to the present invention will be described. A known ink jet printer 130 can be used.

  The ink jet printing machine 130 according to the present embodiment will be described with reference to FIGS. The aqueous chemical solution is supplied from the tank to the inkjet head 132 by a supply pump (not shown).

  A nozzle provided with a plurality of nozzle holes 134 arranged in a straight line at a portion corresponding to the width of the sheet S4 at a portion facing the cut sheet S4 that is a material to be coated of the inkjet head 132. A plate 133 is arranged.

  Here, the distance from the nozzle hole 134 to the secondary continuous sheets S2 and S3 is preferably 1 to 10 mm, more preferably 1 to 3 mm. In the ink jet printing method, since the amount of liquid droplets ejected from each nozzle hole 134 is extremely small, it is easily affected by the environment of the surrounding airflow. However, if it is set to 1 to 10 mm, more preferably 1 to 3 mm, the influence is remarkably small. . The interval between paper and nozzles in a general full color printer is 1 to 1.5 mm. Since human eyes are sensitive to differences in brightness and expression of gradation, the accuracy of dot positions is required to be within several μm in order to obtain sufficient color expression by subtractive color mixing of 4 to 6 colors. On the other hand, in the aqueous chemical solution application of the present invention, the dot position accuracy is within 100 μm, and sufficiently uniform application quality can be obtained.

  In the inkjet head 132, a plurality of ejection units 135 are arranged corresponding to the respective nozzle holes, and each ejection unit 135 includes a fluid chamber 136 for temporarily storing an aqueous chemical solution to be ejected from the nozzle holes 134. And a diaphragm 137 disposed at a portion facing the nozzle plate 133 with the fluid chamber 136 interposed therebetween, a piezoelectric element that is disposed outside the fluid chamber 136 in contact with the diaphragm 137 and formed by a piezoelectric element or the like. And an element (not shown).

  A control device 138 is connected to the piezoelectric element via wiring, and a voltage is applied from the control device 138 to the piezoelectric element at a predetermined interval.

  With this structure, the aqueous chemical solution supplied from the tank to the inkjet head 132 is sent into the fluid chamber 136 that exists corresponding to each nozzle hole 134, and the control device 138 operates the piezoelectric element as necessary. By applying a voltage to the water, the aqueous chemical liquid is ejected from the nozzle holes 134 all at once, and accordingly, the aqueous chemical liquid is applied over the entire width of one surface of the sheet S4.

  Further, the compressed air 135 is configured to be fed into the inkjet head 132 of the present invention, and the droplets ejected from the ejection unit 135 are configured to travel toward the sheet S3 from the nozzle holes 134 through the compressed air, It is configured to prevent paper dust from clogging the nozzle holes.

  In the above-described embodiment, the structure in which the piezo element is employed in the on-demand system as the ink jet format has been described. However, a thermal jet type may be employed. Further, instead of the on-demand method, a continuous-type injection device capable of continuous injection may be employed.

However, the on-demand system by electronic control is preferable, and this makes it easy to change the coating amount in the width direction and the flow direction.

  Here, in the present invention, a more preferable condition in the case of applying an aqueous chemical solution by adopting the ink jet printing method is that the particle velocity of the ink droplet from the nozzle hole is about 5 to 20 m / second, and the capacity of one ink droplet is 5-50 pl / piece.

  Further, it is desirable that the ink droplets are applied at intervals of 20 to 200 μm in the flow direction and the width direction. Thereby, even if the application amount increases or decreases, substantially uniform application is possible. The nozzle interval in the width direction is 128 to 1080 dpi (5-42 lines / mm, 128 dpi × 1 stage to 360 dpi × 3 stages).

For example, when the processing speed is 250 m / min, the ink droplet ejection speed is 5 × 10 ^{4 with} a particle velocity of ink droplets of 10 m / second, a capacity of one ink droplet of 10 pl / piece, and a nozzle spacing of 1080 dpi in the width direction. It is about dot / second / line.

≪Spray application method≫
Next, an example in which a spray coating apparatus is used as the non-contact type chemical coating means 81 and 82 according to the present invention will be described with reference to FIGS.

  For spray coating, a nozzle spray method, a rotor dampening spray method, or the like can be employed. The rotor dampening spray method described later is preferable.

  The spray coating apparatus has a coating unit having a nozzle unit, a rotor dampening unit, or the like depending on the system, in which a plurality of nozzles are arranged in parallel in the width direction of the sheet S4 so that the spray port faces the sheet. The aqueous chemical solution is applied to the sheet S4 by spraying the aqueous chemical solution together.

  The types of nozzles for spraying in the nozzle type spray method include empty cone-type nozzles that spray in an annular shape, full-cone nozzles that spray in a circular shape, full-pyramid types that spray in a square shape, full-length nozzles, fan-type nozzles, etc. The nozzle diameter, the number of nozzles, the nozzle arrangement pattern, the number of nozzle arrangements, or the spray distance, the spray pressure, the spray angle, and the spray liquid so that the aqueous chemical liquid is sprayed uniformly in the width direction of the sheet S4. The concentration, viscosity, etc. can be appropriately selected and used.

  Moreover, about the method of atomizing in a nozzle type spraying apparatus, it can select and use two types, a 1 fluid system or a 2 fluid system. Of these, the one-fluid spraying method uses a compressed air to directly spray water-based chemicals to be sprayed and sprays mist droplets from the nozzle, or air enters the nozzle from fine holes opened on the side of the nozzle near the jet outlet. This is a method of sucking and spraying mist. In addition, the two-fluid spraying method is mixed with a liquid sprayed with compressed air inside the nozzle, an internal mixing type that atomizes, mixed with a liquid sprayed with compressed air outside the nozzle, an external mixing type that atomizes, and atomized Examples include a collision type system in which mist droplet particles collide with each other to further homogenize and atomize the mist droplet particles. A preferred nozzle type spraying device is a two-fluid spraying method.

  An example of the two-fluid spray nozzle unit is as shown in FIG. 14, and will be further described with reference to this. The nozzle unit 110 has an aqueous chemical solution passage 110A at the center and an air passage 110B around it, and the aqueous chemical solution L ejected from the tip of the aqueous chemical solution passage 110A is atomized by the air discharged from the air passage 110B. The aqueous chemical solution L is sprayed in a substantially conical shape. 110C is an external protective casing that protects the nozzle from paper dust and the like, and can clean the nozzle with air that passes through the purge air passage 110D if necessary.

  Here, in the spray-based aqueous chemical solution application, the droplets may be swept away by the rebound of the sprayed aqueous chemical solution or the air accompanying the sheet surface, and the droplets may not adhere to the surface of the sheet S4. In the case of the nozzle type, as shown in FIG. 15, the water-based chemical solution from the nozzle unit 110 is surrounded by the air 110 G ejected from the air supply path 110 F formed in the casing 110 E from the periphery of the nozzle unit 110. A chemical solution can be applied to the sheet S4.

  Next, a rotor dampening spraying method suitable for the present invention among spray coating will be described. In the rotor dampening spray method, as shown in FIGS. 16 to 17, in particular, an apparatus example 140, a plurality of rotor dampening units 141 are arranged in parallel in the width direction of the sheet S4.

  In each loader dampening unit 141, the fluid chamber 143 having the ejecting portion 142 is rotated at high speed, the chemical solution is sent into the fluid chamber 143, and the chemical solution in the fluid chamber is discharged from the ejecting portion 142 by centrifugal force to form a fine mist. It drops. The droplet diameter is controlled by changing the rotational speed of the fluid chamber 143, and the amount of spray liquid (applied amount) is controlled by changing the amount of liquid fed to the fluid chamber. The rotor dampening spraying method has the advantage that a small amount of spray liquid can be uniformly applied to the sheet surface while suppressing the scattering of mist droplets, and the adjustment of the spraying speed and the particle size of the mist is easy. is there.

  In the illustrated embodiment of the rotor dampening unit 141, a shutter 145 that preferably opens and closes the spray port 144 is provided, and the presence or absence of spraying can be controlled by opening and closing the shutter 145. .

  Here, when a plurality of rotor dampening units are arranged so as to be orthogonal to the flow direction of the sheet S4 and are installed perpendicular to the traveling sheet, the interval between the injection holes is preferably 50 to 150 mm.

  On the other hand, in order to spray the aqueous chemical liquid uniformly on the sheet surface, it is preferable that the atomized particle diameter of the atomized aqueous chemical liquid is as small as possible. However, if the mist droplets are too fine, the mist droplets are swept away by the rebound of the sprayed air or the air accompanying the sheet surface, and the mist droplets are less likely to adhere to the sheet surface. For this reason, in the spray application method, the spray distance, spray pressure, spray angle and spray speed are added, and in the case of the two-fluid method, the mixing ratio of the water-based chemical solution and the compressed air for spraying, and the concentration and viscosity of the water-based chemical solution Can be adjusted to a particle size suitable for the application conditions, and if the influence of the accompanying air is large during spraying, a suction device or baffle plate (rectifying plate) for removing the accompanying air, the above-mentioned In addition, a charging electrode (electrostatic spray method) is added to improve the adhesion of mist to pigment coated paper by applying high voltage to the tip of the spray nozzle and charging the mist droplet particles. May be.

  In addition, if the weight average particle diameter of the preferable mist droplet particle | grains when employ | adopting a spray application system is illustrated, it will be 20-150 micrometers.

  Further, the mist droplets floating as mist without being applied to the sheet surface can be sucked and collected and sprayed again.

[Contact embossing process]
On the other hand, in the manufacturing method of the tissue paper product X1 of the present invention, when plying is performed, contact embossing that makes it difficult to separate the sheets can be performed.

  Although not shown, this contact embossing is provided by providing an embossing receiving roll such as a rubber roll that is paired with an embossing roll having an embossing convex portion at an appropriate position of the rotary interfolder, for example, immediately before the cutting of the knife roll 72. can do.

  The specific embossing pattern in this contact embossing is not specifically limited. For example, an emboss made of a unit emboss group having a dot shape, a square shape, a rectangular shape, a circular shape, an oval shape, or the like may be appropriately arranged in a line shape in the width direction of the continuous sheet (the direction corresponding thereto after cutting).

  The unit embossed group may be arranged at equal intervals, but it may not be staggered or evenly spaced, and the contact embosses may be arranged in one row or in two or more rows. Is also possible. The contact embossing may be joined by other means such as ultrasonic waves, in addition to joining by mechanically applying pressure with the embossing roll.

[Cutting process]
A long tissue paper bundle 10C containing the aqueous chemical solution having a width of the secondary continuous sheet S3 formed as described above or the width of the secondary continuous sheet S3 trimmed in the width direction is appropriately cut (not shown). ) Cut (cut) into the width of the tissue paper product to form a tissue paper bundle 10.

"Storage process"
An example of storing tissue paper bundles in a storage box will be described. The storage method of the tissue paper bundle 10 in the storage box 2 is not limited to this example, and a known method can be adopted.

  As shown in FIG. 18, the tissue paper bundle 10 formed by cutting in the cutting process is stored in the storage box 2 in a storage facility subsequent to the rotary interfolder X4.

  Specifically, it includes the above-described upper surface 2U, the bottom surface, and a side surface 2S connecting these, and a bottom surface side end surface piece 23B, a side surface end surface piece 23S, and an upper surface side end surface piece 23U connected to both longitudinal edges of each surface. The storage box is assembled in a semi-finished state in which the bottom end piece 23B, the side end piece 23S, and the top end piece 23U are open, that is, the end face is opened, and the storage box is faced to the opening. The cut sections of the tissue paper bundle 10 sent from the folder X4 are brought together.

  And if it attaches together, the tissue paper bundle 10 will be pushed in in a storage box by a push rod etc. When the tissue paper bundle 10 is pushed into the storage box, the side surface end piece 23S is folded back to the inner surface side of the box, and then the upper surface side end surface piece 23U and the bottom surface side end surface piece 23B are folded to overlap each other. The contact portion is bonded with a hot melt adhesive or the like.

  This adhesion completes the manufacture of the tissue paper product X1 of the present invention.

  In addition, the direction of the paper of the tissue paper 1 constituting the tissue paper bundle 10 manufactured by the rotary interfolder X4 according to the present invention is the lateral direction along the extending direction of the folded portion of the tissue paper 1 (as shown in the figure). CD direction) and the vertical direction (MD direction) along the direction orthogonal to the extending direction of the folded portion of the tissue paper.

  Therefore, when the tissue paper product X1 manufactured by the present invention stored in the storage box 2 as described above is pulled out from the storage box 2 as shown in FIG. It is designed to be along the longitudinal direction (MD direction) of the paper.

  Next, Examples and Comparative Examples of the present invention are shown in Tables 1 to 5 below. As shown in the lower two columns of Table 1 to Table 5, in the rotary type interfolder, the method according to the example of the present invention in which the chemical solution is applied in a non-contact manner after the sheet cut is compared with the comparative example in which such a method is not employed. Superiority is recognized in operability and product quality.

X1 ... tissue paper products, 1 ... tissue paper, 1e ... edge of tissue paper folded edge, 10 ... tissue paper bundle, 2 ... storage box, 2U ... top of storage box (paper box), 2S ... side of storage box (paper box) 20L: Long edge of the storage box (paper box), 20S: Short edge of the storage box (paper box), 21 ... Take-out forming part (perforation line), 22 ... Film, 23B ... Bottom side end piece, 23S ... Side end face Piece, 23U ... upper surface side end piece, 24 ... slit, 25 ... outlet,
X2 ... Paper making equipment, JR ... Primary web roll (jumbo roll), W ... Wet paper, S1 ... Dry base paper (primary continuous sheet), 31 ... Head box, 32 ... Wire part, 32w ... Wire, 333 ... Press part, 33F ... felt, 34, 35 ... dewatering roll, 36 ... Yankee dryer, 36C ... Yankee dryer hood, 37 ... doctor blade, 38 ... winding means, 39 ... winding drum.
X3 ... ply machine, S11, S12 ... primary continuous sheet, S2 ... secondary continuous sheet, 51 ... overlapping part, 56 ... winding means, 56A ... winding drum, 52 ... calendar part,
X4: Rotary interfolder, S3: Secondary continuous sheet, S4: Cut sheet, 71 ... Bed roll, 71A ... Transfer roll, 71a ... Receiving part, 71b ... Groove part, 71c ... Projection part, 72 ... Knife roll, 72C ... Cutter blade, 72a ... groove, 73, 73A ... lap roll, 73B ... count roll, 74 ... tail roll, 75 ... folding roll, 75a ... groove, 76 ... pressure roll, 77 ... slit means, 78A ... first pull roll 78B ... second pull roll, 79A ... delay roll, 79B ... nip roll, R ... restraining roll, 270 ... vacuum hole, 271 ... vacuum source, 80 ... raw roll support, 81,82 ... aqueous chemical solution application means, 85 ... Folding mechanism, A, B ... roll,
DESCRIPTION OF SYMBOLS 130 ... Inkjet, 132 ... Inkjet head, 133 ... Nozzle plate, 134 ... Nozzle hole, 135 ... Injecting unit, 136 ... Fluid chamber, 137 ... Vibrating plate, 138 ... Control device, L ... Aqueous chemical solution,
DESCRIPTION OF SYMBOLS 110 ... Two-fluid type nozzle type water type chemical spraying device, 110A ... Water based chemical solution passage, 110B, 110F ... Air passage, 110C, 110E ... Protective casing, 110D ... Purge air passage, 110G ... Pressure air, 140 ... Loader dampening spraying device , 141... Rotor dampening unit, 142... Injection section, 143... Fluid chamber, 144.

Claims (4)

A method of manufacturing tissue paper products using a rotary interfolder,
Conveying a continuous sheet of crepe paper;
A cutting process for cutting the tissue sheet into a size of tissue paper while holding the continuous sheet on the roll;
An aqueous chemical solution containing water and polyol is applied to one surface of the sheet held on the roll after the cutting by a non-contact coating method, and further, the aqueous chemical solution is applied to the one surface after cutting. Non-contact type water-based chemical solution containing water and polyol with respect to the other side of the sheet held on the second-stage roll in a state in which both outer surfaces of the sheet are exchanged and transferred to the latter-stage roll. An aqueous chemical solution application step of applying an aqueous chemical solution on both sides of the sheet after cutting,
And a step of folding the sheet coated with the aqueous chemical solution. The non-contact coating method, an inkjet printing method or rotor dampening spray method method for producing a coating method a tissue paper according to claim 1, wherein the. The method for producing tissue paper according to claim 1 or 2 , wherein the aqueous chemical liquid contains a polyol as a main component and contains 1 to 15 mass% of water. The method for producing tissue paper according to any one of claims 1 to 3 , wherein the aqueous chemical solution has a viscosity of 1 to 700 mPa · s.

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