JP2018057452A5 - - Google Patents

Description

Tissue paper, tissue paper manufacturing method, and tissue paper product manufacturing equipment

  The present invention relates to a tissue paper, a tissue paper manufacturing method, and a tissue paper product manufacturing facility.

  Folding machines (apparatuses) that form tissue paper bundles that constitute tissue paper products are roughly classified 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.

  Such rotary interfolders are operated at a speed of about 80-100 m / min, and when producing lotion tissue, a moisturizing chemical containing a polyol as a main component on a secondary raw sheet is on-line in a gravure method or a flexo method. Folding is performed using the raw material coated or applied 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 roll for cutting continuous sheets, a roll for conveyance, a roll for folding, etc. as shown in FIG. A large number of 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 in 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 612 and the continuous sheet S ′ by the 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) An intermediate roll (later 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 cutting. The vacuum port having a diameter of about 5 mm is arranged in the CD direction (the width direction of the cut sheet S ″, that is, the axial direction of the roll). The sheet is densely arranged at about 3 to 10 pieces / 230 mm, and the sheet is not misaligned by the wind due to centrifugal force or rotation.

  However, when a moisturizing chemical solution containing polyol as a main component is applied and folded by a rotary interfolder, the operation is greatly affected by an increase in moisture or moisture absorption of the sheet coated with the moisturizing 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 tension of the sheet in the MD direction is higher than that in the conventional low-speed interfolder.

  That is, in the moisturizing chemical solution having a polyol as a main component, the moisture content of the coated sheet is increased because the moisture content is increased, and 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. 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 the vacuum holding of the sheet as described above. However, in the sheet coated with lotion, the sheet sags unevenly due to its elongation (wavy), 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 a moisturizing chemical solution with a high-speed rotary interfolder, the sheet as the base paper of tissue paper is made of hydrophilic pulp fiber. When processing a sheet coated with, 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. As a result, the product becomes thin. 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.

  As described above, when a moisturizing chemical solution is applied to a sheet and folded using a rotary interfolder, the strength of the sheet decreases due to an increase in moisture content or moisture absorption of the sheet on which the moisturizing chemical solution is applied. Arise. Therefore, the present applicant has proposed a method for manufacturing tissue paper products suitable for applying a moisturizing chemical (for example, lotion chemical) (Patent Document 1). However, as the present applicant recognizes, there are a considerable number of people whose moisturizing chemicals themselves do not fit the skin. The problem that the moisturizing chemical solution does not fit the skin cannot be solved by improving the manufacturing method as in Patent Document 1, and the application of the moisturizing chemical solution must be stopped. However, if the application of the moisturizing chemical is simply stopped, the surface properties of the tissue paper (for example, smoothness, moist feeling, etc.) deteriorate. This is contrary to how the lotion tissue has been developed.

  In addition, since the strength of tissue paper is reduced when a moisturizing chemical solution is applied, there arises a problem in operability as described above, but it may also cause tearing during use, slipping through when snuffing, and the like.

JP 2015-16355 A

  The main problem to be solved by the present invention is to provide a tissue paper having excellent surface properties even when no moisturizing chemical solution is used. Moreover, it is providing the method of manufacturing the tissue paper which is excellent in surface property, without using a moisturizing type chemical | medical solution. Furthermore, even if no moisturizing chemicals are applied to each tissue paper, tissue paper manufacturing equipment that makes each tissue paper excellent in surface properties, preferably a rotary interfolder that can be operated at high speed is also adopted. It is to provide a facility for manufacturing tissue paper products.

Means for solving the above problem is a two-ply tissue paper in which two sheets are laminated, and at least one of the sheets is provided with cellulose nanofibers derived from pulp fibers , The sheet provided with the cellulose nanofiber has a basis weight of 10 to 20 g / m ² according to JIS P 8124 (2011), and a paper thickness according to JIS P 8111 (1998) of the two sheets is 130 to 200 μm. It is.

  According to the present invention, the tissue paper is excellent in surface properties even when no moisturizing chemical is used. Moreover, it becomes the method of manufacturing the tissue paper which is excellent in surface property, without using a moisturizing chemical. Furthermore, even if no moisturizing chemicals are applied to each tissue paper, tissue paper manufacturing equipment that makes each tissue paper excellent in surface properties, preferably a rotary interfolder that can be operated at high speed is also adopted. It can be a production facility for tissue paper products.

It is a perspective view of a tissue paper product. It is a perspective view of the use condition of tissue paper products. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2. 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 a rotary type | system | group interfolder. It is a figure which shows the folding mechanism part example 1. FIG. It is another figure which shows the folding mechanism part example 1. FIG. It is a figure which shows the folding mechanism part example 2. FIG. It is a figure which shows the folding mechanism part example 3. FIG. It is a figure for demonstrating the case where the cellulose nanofiber aqueous solution is provided to both surfaces of a sheet | seat. 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.

Next, the form for implementing this invention is demonstrated.
In addition, this form is an example of the form for implementing this invention. It is not intended to limit the scope of the present invention to the scope of this embodiment. Further, the accompanying drawings are for helping understanding of this embodiment. The dimensions and the like in the attached drawings are not necessarily accurate, and important parts may be drawn relatively large. Further, in the present specification, “%” or “part” means “% by mass” and “part by mass”, respectively, unless otherwise specified.

  The contents of Japanese Patent Application Laid-Open No. 2015-16355 (Patent Document 1) relating to tissue paper product manufacturing equipment, and Japanese Patent Application Laid-Open No. 2009-263848, Japanese Patent Application Laid-Open No. 2010-242286, and Japanese Patent No. 5544053 are added to the cellulose nanofibers. The contents of Japanese Patent Application Laid-Open No. 2012-197544 relating to the method for producing multilayer paper are described in the present specification within the scope of the gist of the present invention.

(Tissue paper and its manufacturing method)
The tissue paper of this embodiment is a two-ply (two-layer) tissue paper, and is formed by laminating two sheets. And at least one of the sheets is preferably provided with cellulose nanofibers on both sheets. When cellulose nanofibers are imparted to the sheet, the cellulose nanofibers are clogged between the pulp fibers constituting the sheet, so that the surface property, particularly smoothness, of the tissue paper (sheet) is improved. Moreover, since the cellulose nanofiber is excellent in moisture retention, when the cellulose nanofiber is imparted to the sheet, the surface property of the tissue paper (sheet), particularly the moist feeling, is improved. That is, when cellulose nanofibers are applied to the sheet, the smoothness and moist feeling of the tissue paper (sheet) are improved, so that it is not necessary to use a moisturizing chemical.

  The cellulose nanofibers are preferably applied at the stage of making a sheet, but the cellulose nanofibers are made into a cellulose nanofiber aqueous solution and the cellulose nanofiber aqueous solution is sprayed onto the dried sheet. By taking the form in which the cellulose nanofiber aqueous solution is sprayed on the sheet, the cellulose nanofibers are concentrated on the surface of the sheet, and the surface property improving effect is easily exhibited.

  When cellulose nanofibers are used as an aqueous solution and applied to a dried sheet, it is clear that cellulose nanofibers are concentrated on the surface of the sheet, but it is difficult to clearly (specifically) specify this state. It is. However, if the cellulose nanofibers are in the same state, it is obvious that the same surface property is expressed as a sheet (tissue paper). Therefore, other methods (methods other than the method of making cellulose nanofibers into an aqueous solution and applying them to a dried sheet) can be adopted as appropriate.

  The cellulose nanofiber aqueous solution is obtained by dispersing cellulose nanofibers in water. The adjustment of the concentration of the cellulose nanofiber aqueous solution was performed by first diluting a 2.0% (mass / volume) cellulose nanofiber aqueous solution twice to obtain a 1.0% (mass / volume) cellulose nanofiber aqueous solution, Further dilute to the desired concentration. The concentration of the cellulose nanofiber aqueous solution is, for example, 0.1 to 0.25% (mass / volume), preferably 0.15 to 0.25% (mass / volume), more preferably 0.2 to 0.25%. (Mass / volume). If the concentration of the cellulose nanofiber aqueous solution is less than 0.1% (mass / volume), the strength of the sheet may decrease if the applied amount is increased. If the applied amount is not increased, the surface property of the sheet is sufficient. May not improve. On the other hand, when the concentration of the cellulose nanofiber aqueous solution exceeds 0.25% (mass / volume), the cellulose nanofibers are not uniformly applied to the sheet surface (for example, partly excessive), and the sheet. The surface property may not be improved uniformly.

  The B-type viscosity (60 rpm, 20 ° C.) of the aqueous cellulose nanofiber solution is, for example, 300 cps or less, preferably 200 cps or less, more preferably 50 cps or less when the concentration is 0.2% (mass / volume). By suppressing the B-type viscosity of the aqueous cellulose nanofiber solution in this manner, the cellulose nanofibers are uniformly applied to the sheet surface, and the surface properties of the sheet are improved uniformly.

  The applied amount of the cellulose nanofiber aqueous solution is, for example, 10 to 25 parts by mass, preferably 15 to 25 parts per 100 parts by mass of the sheet when the concentration is 0.2% (mass / volume). It is 20 mass parts more preferably 20 mass parts. If the applied amount of the cellulose nanofiber aqueous solution is less than 10 parts by mass, the surface property of the sheet may not be sufficiently improved. On the other hand, when the applied amount of the cellulose nanofiber aqueous solution exceeds 25 parts by mass, the amount of moisture to be added also increases, so that the surface properties of the sheet may be lowered and the bulkiness may be lowered. .

  The cellulose nanofibers are preferably applied by spraying, more preferably by nozzle spraying, and particularly preferably by rotor dampening spraying. Details of this point will be described when a tissue paper product manufacturing method and manufacturing equipment described later are described.

  In the present specification, cellulose nanofiber (hereinafter referred to as CNF) refers to fine cellulose fiber obtained by defibrating pulp fiber, and generally has a fiber width of nanosize (1 nm or more, 1000 nm or less). Although it refers to cellulose fibers containing fine cellulose fibers, fibers having an average fiber width of 100 nm or less are preferred. The average fiber width is calculated using, for example, a certain number average, median, mode diameter (mode), and the like.

  Pulp fibers that can be used for the production of CNF include chemical pulps such as hardwood pulp (LBKP) and softwood pulp (NBKP), bleached thermomechanical pulp (BTMP), stone grand pulp (SGP), and pressed stone grand pulp (PGW). ), Refiner Grand Pulp (RGP), Chemi Grand Pulp (CGP), Thermo Grand Pulp (TGP), Grand Pulp (GP), Thermo Mechanical Pulp (TMP), Chemi Thermo Mechanical Pulp (CTMP), Refiner Mechanical Pulp (RMP) Etc. Manufactured from mechanical pulp, tea waste paper, craft envelope blind paper, magazine waste paper, newspaper waste paper, flyer waste paper, office waste paper, corrugated waste paper, Kami white waste paper, Kent waste paper, imitation waste paper, land ticket waste paper, recycle paper waste paper, etc. Waste paper pulp, deinking pal obtained by deinking waste paper pulp (DIP). These may be used singly or may be used in combination of plural kinds as long as the effects of the present invention are not impaired. Furthermore, you may use what performed chemical treatments, such as carboxymethylation, with respect to the said pulp fiber.

  Examples of the method for producing CNF include mechanical methods such as a high-pressure homogenizer method, a microfluidizer method, a grinder grinding method, a bead mill freeze grinding method, and an ultrasonic defibrating method, but are not limited to these methods. . Nanofiperization is promoted by a combination of TEMP oxidation treatment, phosphate esterification acid treatment, and the like.

  CNF used here is CNF of NBKP 100%. CNF having an average fiber width (median diameter) of 49 nm was used. This CNF was obtained by subjecting NBKP to refiner treatment and rough defibrating, and then treating and defibrating four times using a high-pressure homogenizer.

  Here, a method for measuring the fiber width (average fiber width) of CNF will be described.

  First, 100 ml of an aqueous dispersion of cellulose nanofiper having a solid content concentration of 0.01 to 0.1% by mass was filtered with a membrane filter made of Teflon (registered trademark), once with 100 ml of ethanol, and three times with 20 ml of t-butanol. Replace.

  Next, the sample is freeze-dried and coated with osmium. This sample is observed by an electron microscope SEM image at a magnification of 5000 times, 10000 times, or 30000 times (in this example, a magnification of 30000 times) depending on the width of the constituent fibers. Specifically, two diagonal lines are drawn on the observation image, and three straight lines passing through the intersections of the diagonal lines are arbitrarily drawn. Further, a total of 100 fiber rods intersecting with the three straight lines are visually measured. The median diameter (median diameter) of the measured value is taken as the average fiber diameter. In addition, it is good also considering not only the median diameter of a measured value but a number average diameter and a mode diameter (mode diameter) as an average fiber diameter, for example.

The basis weight of the sheet provided with cellulose nanofibers is, for example, 10 to 20 g / m ² , preferably 15 to 19 g / m ² , and more preferably 16 to 18 g / m ² . If the basis weight of the sheet is less than 10 g / m ² , the strength of the tissue paper (sheet) will be inferior even if the application of moisturizing chemicals is avoided, and tearing when using the tissue paper or slipping through when sniffing the nose will occur. May occur. On the other hand, if the basis weight of the sheet exceeds 20 g / m ² , the tissue paper (sheet) will be too strong and may be inferior in terms of softness.

In this embodiment, cellulose nanofibers are given to both sheets, but when cellulose nanofibers are given only to one sheet, the basis weight of the other sheet (sheet without cellulose nanofibers) is normal. For example, the tissue paper can be 10 to ²⁰ g / m ² .

  In this specification, sheet (tissue paper) basis weight means the value measured based on JISP8124 (2011).

  The paper thickness of two sheets, that is, the paper thickness of a two-ply tissue paper (a set of tissue paper) is, for example, 130 to 200 μm, preferably 140 to 190 μm, and more preferably 150 to 170 μm. If the paper thickness (of a pair of tissue paper) on two sheets is less than 130 μm, the strength will be inferior even if application of moisturizing chemicals is avoided. Etc. may occur. On the other hand, if the paper thickness of the two sheets exceeds 200 μm, the tissue paper becomes too strong and may be inferior in terms of softness.

  In the present specification, the paper thickness means a value measured in accordance with JIS P 8111 (1998). More specifically, measurement is performed 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 measurement table, lower the plunger on the measurement table, move the dial thickness gauge memory, set the zero point, 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 having 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 70 gf. The paper thickness is an average value obtained by performing measurement 10 times.

(Tissue paper products and their manufacturing methods / equipment)
Next, tissue paper products and manufacturing methods / equipment thereof will be described.
1-3, the tissue paper product X of this form is illustrated. The tissue paper product X is obtained by storing the tissue paper bundle 10 in the storage box 2. Further, the tissue paper bundle 10 is formed by folding a plurality of sets of tissue papers 1 so as to be layered. As described above, the tissue paper 1 is formed by laminating two sheets. In the present embodiment, the tissue paper 1 is made of two-ply (layer) crepe paper.

  The storage box 2 is a rectangular parallelepiped box. The storage box 2 is also called a carton box. The storage box 2 has the appearance of the tissue paper product X.

  An outlet 25 or an outlet forming portion 21 is formed on the upper surface 2U of the storage box 2. At the time of use, when the tissue paper 1 is taken out from the take-out port 25, a part of the lower-layer tissue paper 1 laminated adjacently is exposed from the take-out port 25.

  The storage box 2 includes a paper box 20 having an outlet forming portion 21 and a resin film 22 that covers a portion (range) 21 a surrounded by the outlet forming portion 21 from the inside of the paper box 20.

  The paper box 20 is a paper box that forms an outline of the storage box 2. The size, shape, developed shape, and the like of the paper box 20 can be the same as those of a known paper box.

  The illustrated paper box 20 has a rectangular parallelepiped shape having a rectangular upper surface 2U composed of a pair of parallel long edges 20L, 20L and a pair of parallel short edges 20S, 20S shorter than these 20L, 20L. is there.

  The paper box 20 is connected to an upper surface 2U, a bottom surface (not shown), a pair of side surfaces 2S connecting the upper surface 2U and the bottom surface, an upper surface side end surface piece 23U connected to both longitudinal edges of the upper surface, and both longitudinal edges of the bottom surface. The bottom surface side end surface piece 23B and the side surface end surface pieces 23S connected to the both side edges in the longitudinal direction of the pair of side surfaces 2S are provided. When assembling the box 20, the side face piece 23S is folded back to the inner face side of the box, and the bottom face end face piece 23B and the upper face side end face piece 23U are folded over and overlapped with each other. Adhere with an adhesive.

  The paper box 20 is preferably an inner shape that is slightly larger than the tissue paper bundle 10 and 1 to 20 mm larger than the outer shape of the tissue paper bundle 10. Specifically, it is preferable that the long edge of the paper box 20 is 110 to 320 mm, the short edge is 70 to 200 mm, and the height is 40 to 150 mm.

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. However, the material of the paper box 20 is preferably coated cardboard having a basis weight of 250 to 500 g / m ² , more preferably coated cardboard having a basis weight of 350 to 400 g / m ² .

  Although not shown, on the outer surface of the paper box 20, for example, a flower pattern, a spiral pattern, a wave pattern, a dot pattern, a turtle shell pattern, a star pattern, a cross pattern, a geometric pattern, a character, a figure, a picture, a symbol, A pattern or the like by a combination of these can be given. These patterns and the like can be applied by a known printing method such as gravure printing.

  The outlet forming portion 21 is formed of an annular perforation line (in the present embodiment, the outlet forming portion 21 is also referred to as an annular perforation line 21). The annular perforation line 21 can be formed by a known method and a cut tie ratio.

  The specific shape of the site | part (range) 21a enclosed by the outlet formation part 21 is not specifically limited. However, as shown in FIGS. 1 and 2, the portion 21 a is preferably substantially oval or rectangular with the long side in the direction along the longitudinal direction of the upper surface 2 </ b> U. This shape has advantages such as excellent tissue paper take-out and convenience, and production on an existing production line.

  The resin film 22 is larger (wider) than the portion (range) 21 a surrounded by the outlet forming portion 21. The resin film 22 is, for example, a rectangle or an ellipse. The resin film 22 is adhered to the outside of the outlet forming portion 21 on the inner surface side of the upper surface 2U of the paper box 20 so that the part (range) 21a surrounded by the outlet forming portion 21 is not particularly affected. Has been.

  As a material of the resinous film 22, for example, a polypropylene film, a polyester film, preferably a polyethylene film can be used.

  The thickness of the resin film 22 is preferably 10 to 200 μm. If the thickness is less than 10 μm, the strength is insufficient, and there is a risk of tearing or breaking when the tissue paper 1 is taken out. On the other hand, when the thickness exceeds 200 μm, it may be difficult to take out, and the cost increases.

  A slit 24 is formed in the resin film 22. The slit 24 is located within a range surrounded by the annular perforation line 21. Therefore, as shown in FIG. 2, when the portion 21a surrounded by the perforation line 21 is cut off along the annular perforation line 21, an outlet 25 is formed on the upper surface 2U of the paper box 20, and the outlet 25 is Thus, the resin film 22 and the slit 24 are exposed.

  The tissue paper 1 stored as a bundle in the paper box 20 (storage box 2) can be taken out one by one from the outlet 25 through the slit 24. Further, the slit 24 supports a part of the tissue paper 1 exposed from the outlet 25, thereby preventing the tissue paper 1 from falling into the paper box 20.

  As shown in FIG. 3, in the tissue paper bundle 10, the square tissue paper 1 is folded in two, and the folded pieces are overlapped alternately so that the edges 1 e of the folded pieces are located on the folded inner surface of the tissue paper 1 adjacent vertically. Are stacked.

  In this embodiment, when the folded piece of the tissue paper 1 positioned at the uppermost position is pulled upward, the folded pieces of the other adjacent tissue paper 1 immediately below it are pulled upward by friction and lifted. Thereby, the folded piece of the other tissue paper 1 is exposed outside the paper box 20 through the slit 24.

  The number of tissue sets of the tissue paper 1 constituting the tissue paper bundle 10 is, for example, 120 to 240 sets.

(Manufacture of primary roll)
In manufacturing the tissue paper product X, as shown in FIG. 4, first, a primary raw roll (so-called jumbo roll) JR is manufactured by the papermaking equipment X1. This will be specifically described below.

  In the papermaking facility X1, first, a wet stock W is formed by adding an appropriate chemical to the pulp slurry from the head box 31 and supplying a paper stock prepared in advance onto the wire 32W of the wire part 32 (forming process). Next, the wet paper W is transferred to the felt 34 of the press part 33 and is sandwiched and dehydrated by a pair of dewatering rolls 34 and 35 (dehydration process).

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

  Then, the dried base paper S1 is wound by the winding means 38 having the 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).

  For example, the primary raw roll JR has a diameter of 1000 to 5000 mm, a length (width) of 1500 to 9200 mm, and a winding length of 5000 to 80000 m.

  Although not shown, a calendar process may be provided before the primary roll winding process, and the front and back surfaces of the dried base paper S1 scraped off by the doctor blade 37 may be smoothed. The surface of the dry base paper S1 is the surface on the side in contact with the cylinder of the Yankee dryer 36. Further, the back surface of the dry base paper S1 is a surface opposite to the surface that is in contact with the cylinder of the Yankee dryer 36. Although it depends on the presence or absence of the calendar process, the surface in contact with the mirror-like Yankee dryer is generally smoother and has better surface properties.

The primary continuous sheet (dried base paper) S1 is later laminated and processed into tissue paper 1, and has a basis weight equivalent to the basis weight of tissue paper 1 before plying of cellulose nanofibers per ply. . Accordingly, the basis weight of the primary continuous sheet S1 is, for example, 10 to 25 g / m ² , preferably 12 to 20 g / m ² , and more preferably 13 to 16 g / m ² . When the basis weight is less than 10 g / m ² , it is preferable in terms of softness, but there is a possibility that an appropriate strength cannot be secured. On the other hand, when the basis weight exceeds 25 g / m ² , it becomes too hard and the touch is deteriorated.

  The paper thickness of the primary continuous sheet S1 is equivalent to the paper thickness of the tissue paper 1 per ply before the cellulose nanofiber is applied. Therefore, the paper thickness of the primary continuous sheet S1 is, for example, 80 to 250 μm, preferably 100 to 200 μm, and more preferably 130 to 180 μm.

  The crepe rate of the primary continuous sheet S1 is, for example, 10 to 30%, preferably 12 to 25%, and more preferably 13 to 20%. When the crepe rate is less than 10%, it is easy to break the paper during processing in the subsequent stage, and there is a possibility that the tissue paper 1 with little elongation is not damaged. On the other hand, if the crepe rate exceeds 30%, it is difficult to control the sheet tension during subsequent processing, and it is easy to break the paper, and wrinkles may occur and the tissue paper 1 may have poor appearance. The occurrence of wrinkles leads to difficulty in folding the tissue paper 1.

In this specification, the crepe rate is a value calculated by the following equation.
Crepe rate = ((peripheral speed of the dryer during papermaking−peripheral speed of the reel) / peripheral speed of the dryer during papermaking) × 100

  In the primary continuous sheet S1, the longitudinal direction of the dry tensile strength (dry paper strength) is 200 to 700 cN / 25 mm, preferably 250 to 600 cN / 25 mm, more preferably 300 to 600 cN / 25 mm with 2 plies, The direction is 100 to 300 cN / 25 mm, preferably 130 to 270 cN / 25 mm, more preferably 150 to 250 cN / 25 mm with 2 plies. If the dry tensile strength 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 during use.

  In this specification, the dry tensile strength is a value measured according to JIS P 8113: 2006.

  The dry paper strength of the primary continuous sheet S1 can be adjusted by a known method, for example, a dry paper strength enhancer is internally added to the stock or wet paper, the freeness of the stock is reduced, for example, 30 to 40 ml is reduced. Known techniques such as increasing the NBKP blending ratio of the pulp, for example, 50% or more can be appropriately combined.

  As the dry paper strength agent, for example, starch, polyacrylamide, CMC (carboxymethylcellulose), sodium carboxymethylcellulose which is a salt of CMC, carboxymethylcellulose calcium, carboxymethylcellulose zinc and the like can be used.

  When the dry paper strength agent is internally added, the addition amount can be set to 0.5 to 1.0 kg / t in mass ratio with respect to the pulp slurry.

  As the wet paper strength agent, for example, 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 5 to 20 kg / t in mass ratio to the pulp slurry.

  The paper material used as a raw material of the primary raw roll JR (primary continuous sheet S1) is obtained by adding an appropriate chemical to a slurry (pulp slurry) containing pulp as a main raw material as a fiber raw material.

  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, for example, wood pulp, non-wood pulp, synthetic pulp, waste paper pulp, and the like, and more specifically, groundwood pulp (GP), stone grandwood pulp (SGP), refiner grandwood pulp (RGP), Pressurized groundwood pulp (PGW), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), bleached chemithermomechanical pulp (BCTMP) and other mechanical pulp (MP), chemical mechanical pulp (CGP), semi-chemical Chemistry such as kraft pulp (KP), soda pulp (AP), sulfite pulp (SP), dissolved pulp (DP), etc. Pulp (CP), nylon, rayon, polyester, polyvinyl Using raw pulp such as synthetic pulp, deinked pulp (DIP), waist pulp (WP), etc., raw pulp (TP), cotton, flax, hemp, jute, manila hemp, ramie, etc. made from lucol (PVA) One or several types can be appropriately selected and used from slagging pulp, straw pulp, esparto pulp, bagasse pulp, bamboo pulp, kenaf pulp, and other auxiliary pulps such as bast pulp.

  However, as a raw material pulp, what mix | blended NBKP and LBKP which are virgin pulp is more preferable. NBKP and LBKP have good compatibility with cellulose nanofibers, and are suitable for the production method of this embodiment in which a folding step is continued after application (particularly spraying). The blending of NBKP and LBKP is also desirable in terms of the texture of the resulting tissue paper 1.

  The blending ratio of NBKP and LBKP is preferably NBKP: LBKP = 20: 80 to 80:20, more preferably NBKP: LBKP = 30: 70 to 60:40.

  In this specification, the blending ratio of NBKP and LBKP is measured according to JIS P 8129: 1998.

  In addition, although waste paper pulp can also be mix | blended if necessary, it is preferable to restrain the compounding quantity of waste paper pulp to the range which the tissue paper 1 does not become hard.

  Examples of chemicals added to the paper stock include, for example, dry paper strength enhancers, wet paper strength enhancers, softeners, release agents, adhesives, pH adjusters such as caustic soda, adhesives, antifoaming agents, preservatives, Examples include slime control agents and dyes.

(Manufacture of secondary web roll)
The primary web roll JR produced by the papermaking equipment X1 is transferred to the secondary web roll production equipment X2 (hereinafter also referred to as a ply machine X2) shown in FIG. 5 and ply processing (lamination of the primary continuous sheet S1). Process).

  The ply machine X2 can set two primary rolls JR, and the primary continuous sheets S11 and S12 fed from the primary rolls JR and JR are laminated along the continuous direction to form a laminated continuous sheet S2 and It is comprised so that it may be supplied to the superimposition part 51 to perform.

  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 (process) 51 so as to be the surfaces of the laminated continuous sheets S2, respectively.

  In this specification, the “surface” of the laminated continuous sheet S2 means a laminated outer surface. Even if the back surfaces of the primary continuous sheets S11 and S12 are respectively configured to be the surface of the laminated continuous sheet S2, either one of the back surfaces of the primary continuous sheets S11 and S12 is the one surface of the laminated continuous sheet S2, and the other surface is You may comprise so that it may become the other surface of lamination | stacking continuous sheet S2. However, the surfaces of the primary continuous sheets S11 and S12 are in contact with the surface of the Yankee dryer 36 during drying, and are less fuzzy and smoother than the back surface. Therefore, it is desirable that the surfaces of the primary continuous sheets S11 and S12 constitute both outer surfaces of the laminated continuous sheet S2.

  The ply machine X2 is provided with winding means 56 for winding the laminated continuous sheet S2 into the secondary raw roll R after the overlapping section 51. The winding means 56 has a pair of winding drums 56A and 56A 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.

  The ply machine X <b> 2 is provided with slit means 55 in front of the winding means 56. By slitting the laminated continuous sheet S2 in the continuous direction by the slit means 55 to have an appropriate width according to the processing width of the rotary interfolder X3 at the subsequent stage, and then winding up, the width of the secondary raw roll R Is adjusted accordingly. Specifically, for example, slitting is performed so that the continuous side edge of the laminated continuous sheet S2 is cut, and a trim width of 40 to 100 mm is added to multiple times of the tissue slit width processed by the rotary interfolder X3. Can be adjusted to the width.

  In the rotary type interfolder X3, since the trimming process can be performed after the knife roll online, it is not always necessary to perform the slit in the manufacturing process of the secondary raw roll R. Rather, if a secondary web roll R having a width substantially the same as the width of the primary web roll JR is manufactured and set as it is on the web roll support portion 80 of the rotary type interfolder X3, the operation and equipment are simplified. desirable. The slit process may be provided only when necessary in relation to the secondary web roll support portion 80 of the rotary type interfolder X3, such as when the width of the primary web roll JR is excessively large.

  The width of the secondary web roll R can be set to an appropriate width according to the roll width constituting the rotary interfolder X3, that is, the processable width. Generally, it is 800-4600 mm from the width | variety (150-250 mm) of tissue paper 1 and productivity.

  In the production facility X2 for the secondary web roll R, the processing speed is, for example, 350 to 1100 m / min, preferably 700 to 1050 m / min, more preferably 900 to 1000 m / min. If the processing speed is less than 350 m / min, productivity may be insufficient. On the other hand, if the processing speed exceeds 1100 m / min, stable production may be difficult.

  In the ply machine X3, one or more calendar portions 52 are provided between the overlapping portion 51 and the winding portion 56, and the laminated continuous sheet S2 can be calendered.

  The type of calendar in the calendar unit 52 is not particularly limited. However, it is preferable to use a soft calendar or a chilled calendar from the viewpoint of improving the smoothness of the surface of the primary continuous sheets S11 and S12 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 52 can be changed as appropriate. If a plurality of devices are installed, there is an advantage that even if the processing speed is high, it can be sufficiently smoothed. On the other hand, having one has the advantage that it can be installed even if the space is small.

  When two or more calendar parts 52 are installed, they can be arranged in parallel in, for example, the horizontal direction, the vertical direction, and the diagonal direction. Moreover, it can also arrange | position combining these installation directions. When arranged side by side in the horizontal direction, the holding angle becomes small, so that the processing speed can be increased. If it is arranged side by side in the vertical direction, the installation space can be reduced.

  In the present specification, the holding angle means an angle while the sheets (primary continuous sheets S11, S12) are in contact with each other as viewed from the axis center of the roll (a part of an arc of a cross section perpendicular to the axis).

  Paper making is also performed as control factors such as calendar type, nip line pressure, and number of nips in the calendar section 52, and these control factors should be changed as appropriate according to the quality of tissue paper to be obtained, for example, paper thickness and surface properties. Is preferred.

(Manufacture of tissue paper products)
As shown in FIG. 6, the secondary raw roll R manufactured by the ply machine X2 is rotatably attached to the raw roll support part 80 of the rotary interfolder X3. Hereinafter, the case where the secondary continuous sheet S3 is unwound from the secondary raw roll R wound up with the laminated continuous sheet S2 on which the primary continuous sheets S11 and S12 are laminated, and the secondary continuous sheet S3 is processed will be described as an example. To do.

  In the rotary type interfolder X3, the secondary continuous sheet S3 is unwound (unwound) from the secondary raw roll R attached to the raw roll support section 80, appropriately pressed 86, and the folding mechanism section 85 uses cellulose. The nanofiber aqueous solution is applied, and the tissue paper 1 is folded to form the tissue paper bundle 10.

  In this regard, the application of the cellulose nanofiber aqueous solution can be performed by the folding mechanism 85 as in the present embodiment, or can be folded as indicated by the two-dot chain lines in FIG. 6 as non-contact type applying means (apparatus) 81a and 82a. It can also be performed before the mechanism unit 85. When the folding mechanism unit 85 is used, the equipment is downsized, and when the folding mechanism unit 85 is provided at the front stage, there is an advantage that the application of the cellulose nanofiber aqueous solution is stabilized.

  In the case where the application of the cellulose nanofiber aqueous solution is performed in the front stage of the folding mechanism unit 85, for example, the cellulose nanofiber aqueous solution applying equipment shown in FIG. 11 may be installed in the folding mechanism unit 85.

(Rotary interfolder)
The rotary type interfolder X3 of this embodiment is suitable for high speed operation. The high speed means that the secondary continuous sheet S3 is conveyed at a speed of at least 150 m / min. However, it is preferably 250 m / min or more, more preferably 280 m / min or more, if determined by the relationship between the productivity of tissue paper products and the effect of this embodiment. When the conveyance speed of the secondary continuous sheet S3 is 150 m / min or more, there is an advantage in terms of productivity. However, when the conveyance speed of the secondary continuous sheet S3 exceeds 300 m / min, it is difficult to stably fold the secondary continuous sheet S3 to which the aqueous solution of cellulose nanofibers is applied.

  Next, an example of a folding mechanism portion of the rotary interfolder X3 suitable for speeding up that can be suitably employed in this embodiment will be described.

(Folding mechanism part example 1)
A folding mechanism part example 1 of the rotary interfolder X3 is shown in FIGS.
The folding mechanism unit example 1 includes a pair of rolls 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 a tail roll 74. 7 and 8, only one of the rolls other than the folding roll 75 is shown, and the other is omitted.

  In the folding mechanism unit example 1, each roll is driven by a servo motor. The rotational speed, peripheral speed, and the like of each roll are adjusted by electronic control in accordance with the tension and the like of the secondary continuous sheet S3. By this adjustment, the delivery timing of the secondary continuous sheet S3 between the rolls can be kept constant.

  The bed roll 71 conveys the secondary continuous sheet S3 while holding it on the roll surface, and transfers it to the subsequent roll. While the secondary continuous sheet S3 is being held, the bed roll 71 holds the tip of the secondary continuous sheet S3 with a nail or the like, or sucks it toward the center of itself through the vacuum hole 712 as shown in the example. doing.

  The knife roll 72 includes a cutter blade 72C on the surface. The knife roll 72 rotates in pairs with the bed roll 71. The knife roll 72 brings the cutter blade 72C into contact with the secondary continuous sheet S3 conveyed on the bed roll 71 at an appropriate interval, and cuts the secondary continuous sheet S3 in the sheet width direction. By this cutting, the secondary continuous sheet S3 conveyed on the bed roll 71 is separated from the upstream secondary continuous sheet S3.

  The cutting interval of the secondary continuous sheet S3 matches the width (length) of the tissue paper product.

  The cut sheet S4 that has been cut is conveyed while being held on the bed roll 71, and the outer surfaces of the cut sheet S4 are exchanged, and the cut sheet S4 is delivered to the subsequent wrap roll 73. This delivery can be realized by, for example, a technique of stopping the vacuum of the bed roll 71 when the cutting sheet S4 comes close to the lap roll 73 and starting suction in the inner direction of the lap roll 73. 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 S3 held on the bed roll 71 together with the bed roll 71 when the secondary continuous sheet S3 is cut. Due to the presence of the pressure roll 76, even if the secondary continuous sheet S3 is cut while increasing the suction capability in the bed roll 71, the secondary continuous sheet S3 does not flutter, and the secondary continuous sheet S3 is sequentially moved from the front end to the rear end. Instead, it is sucked onto the bed roll 71 and securely held. Further, since the cutting by the knife roll 72 is performed in a state where the leading end portion of the secondary continuous sheet S3 is sandwiched between the pressure roll 76 and the bed roll 71, the secondary continuous sheet S3 is pulled backward at the time of cutting. In addition, the fluctuation in tension is effectively absorbed, and flapping of the secondary continuous sheet S3 during cutting is also prevented.

  The wrap roll 73 conveys the cut sheet S4 cut from the bed roll 71 while being held on the surface. The wrap roll 73 shifts the leading edge of the cutting sheet S4 in the rotational direction to a corresponding folding roll 75 that rotates at a lower speed than the wrap roll 73. In this transition (delivery), known techniques such as stopping the vacuum at the leading edge of the cutting sheet S4 in the rotational direction, jetting gas to the cutting sheet S4, and installing a mechanical gripping mechanism for the cutting sheet S4 at a predetermined position. Adopted.

  The wrap roll 73 in the illustrated example is formed with vacuum holes 710 and 710 so as to hold two or more points between the front edge portion in the rotation direction and the rear edge portion in the rotation direction of the cutting sheet S4, and the cutting sheet S4. Can be reliably held on the lap roll 73.

  Although not shown, the vacuum holes in the roll of the rotary interfolder X3 are scattered on the surface along the axial direction of the roll as is well known. Therefore, the rotation direction front end, the rotation direction rear end, and the vacuum hole formed so as to hold two or more points between them are the rotation direction front end, the rotation direction rear end of the cutting sheet S4, It means that a plurality of vacuum holes are arranged along the axial direction of the roll at each position holding two or more points between them. The number of holes is a matter of design.

  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. From the wrap roll 73, the tail edge of the rotation direction rear edge (tail) of the cutting sheet S4, whose front edge in the rotation direction has been transferred to the folding roll 75, is transferred to the tail roll 74. Hold on your own surface. The holding mechanism is the same as the bed roll 71 described above.

  By the difference in rotational speed between the wrap roll 73 and the folding roll 75 and the transitional front edge of the cutting sheet S4 being transferred to the folding roll 75, and then the rotational trailing edge (tail) being shifted to the tail roll 74. A slack portion (also referred to as a bubble) St is temporarily formed on the cutting sheet S4.

  The transition of the front end portion of the cutting sheet S4 in the rotation direction from the wrap roll 73 to the folding roll 75 is transferred to the tail roll 74 while the trailing edge in the rotation direction of the previous cutting sheet S4 forms a slack portion from the wrap roll 73. To be done.

  When the trailing edge in the rotational direction of the cutting sheet S4 is transferred from the tail roll 74 to the folding roll 75, the front edge in the rotational direction of the subsequent cutting sheet S4 exists at that portion (transition part). Therefore, when the cut sheet S4 is completely transferred from the tail roll 74 to the folding roll 75, on the folding roll 75, below the rear edge in the rotation direction of the previous cut sheet S4 (on the folding roll 75 side), The leading edge of the cutting sheet S4 in the rotational direction is located and overlapped (wrapped).

  The folding roll 75 folds the cut sheet S4 (sheet group) partially overlapping. The pair of folding rolls 75 are close to each other, and similarly, the sheet group (S4) that is sent while overlapping a part of the pair of folding rolls 75 is overlapped with its own sheet group (S4). In addition, the sheet group (S4) is folded so that the edges of the sheets are pressed against each other at the overlapping portion.

  As described above, the rotary interfolder X3 of the present embodiment has a vacuum capability in the wrap roll 73 by separating the knife roll 72 and the bed roll 71 and the lap roll 73 that cut the secondary continuous sheet S3. In addition, the speed is achieved by individually managing the speed of each roll by a servo.

  In addition, the slack portion St is temporarily formed by the wrap roll 73, the folding roll 75, and the tail roll 74, so that a part of the preceding cutting sheet S4 and a part of the subsequent cutting sheet S4 are overlapped. Therefore, the sheet group (S4) on which the parts are overlapped is folded by the folding roll 75, so that extremely high speed operation is possible.

(Folding mechanism part example 2)
FIG. 9 shows an example 2 of a folding mechanism part of a rotary interfolder suitable for speeding up. This folding mechanism unit example 2 includes 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 pairs. Folding rolls 75 and 75 are provided. It has an appropriate holding roll 75F as necessary.

  The folding mechanism part 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 78A, 78B while being nipped by the first pull roll 78A and the second pull roll 78B, and is nipped between the second pull roll 78B and the bed roll 71 while being nipped by the first pull roll 78A. To be supplied.

  The relationship between the bed roll 71 and the knife roll 72 is the same as in the folding mechanism unit example 1 described above. However, unlike the folding mechanism unit example 1, when the secondary continuous sheet S3 is cut by the knife roll 72 and the bed roll 71, the second pull roll 78A and the bed roll 71 are located behind the secondary continuous sheet S3 (the original roll side). And the nip between the first pull roll 78A and the second pull roll 78B. As a result, the secondary continuous sheet S3 is prevented from being pulled forward at the time of cutting, and variations in tension can be effectively absorbed, and flapping of the secondary continuous sheet S3 at the time of cutting is prevented.

  The cutting sheet S4 cut by the knife roll 72 is conveyed while being held by the suction mechanism of the bed roll 71, and further conveyed by the bed roll 71 to a subsequent roll.

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

  In this mechanism example 2, the nip roll 79B exists at a position that is a predetermined distance away from the nip position between the bed roll 71 and the delay roll 79A on the traveling direction side of the bed roll 71. The nip roll 79B and the delay roll 79A are positioned so that the cut sheet S4 can be clamped. When the sheet is transferred from the bed roll 71 to the delay roll 79A, first, the rotation direction leading edge of the cut sheet S4 is transferred from the bed roll 71 to the delay roll 79A, and the rotation direction trailing edge temporarily moves to the nip roll 79B. Then, it is configured to be sequentially transferred to the delay roll 79A.

  When the rotation direction rear 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 cutting sheet S4 is already at the position from the bed roll 71 to the delay roll 79A. Passed and exists. Therefore, on the delay roll 79A, the leading edge portion in the rotational direction of the subsequent cutting sheet S4 is positioned below and overlapped (wrapped) below the trailing edge portion in the rotational direction of the preceding cutting sheet S4.

  A wrap roll 73A to which the wrapped cutting sheet S4 is conveyed is present at the subsequent stage of the delay roll 79A, and the superimposed cutting sheet S4 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 holding rolls 75F and 75F are positioned in the middle of the wrap roll 73A and the folding rolls 75 and 75, and the cutting sheet S4 is configured to pass between these rolls 75F and 75F.

  A pair (two) of folding rolls 75 and 75 having the same configuration are arranged close to each other, and the partially overlapped cutting sheet group (S4) is transferred to the adjacent portion from above.

  The folding rolls 75 and 75 of this embodiment have a sheet holding mechanism including a grip mechanism (pick mechanism) that holds the cut sheet S4 on each of the rolls 75 and 75 and a tacker mechanism. A pair of folding rolls 75 and 75 are alternately held by the sheet holding mechanism and released by the sheet front edge portion and the sheet rear edge portion of the cut sheet S4 that are partially overlapped and fed at every other portion in the proximity portion. While moving downward. By transporting the cut sheet S4 of each of the rolls 75 and 75 and sandwiching / releasing the sheet edge at a predetermined position, a tissue paper bundle 10C is formed below the folding rolls 75 and 75.

  In the folding mechanism part example 2, high speed can be achieved by partially overlapping the cut sheet S4 with the delay roll 79A, the nip roll 79B, and the bed roll 71. Further, similarly to the folding mechanism unit example 1, since the cutting and folding and the overlapping of the cutting sheet S4 are separate processes, flapping of the cutting sheet S4 is prevented and the cutting sheet S4 is securely held on the roll surface. be able to.

  Also in the folding mechanism part example 2, each roll can be controlled by a servo mechanism, and the suction force in the lap roll 73A and the bed roll 71 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 thereof of the cutting sheet S4, as in the folding mechanism section example 1. The mechanism part example 2 described above also achieves speeding up of the rotary interfolder.

(Folding mechanism part example 3)
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 folding mechanism unit example 3 is configured to fold separate secondary continuous sheets S3 from each other. In this embodiment, since each roll group has a pair of left and right, only one of the common points will be described. In FIG. 10, only one of the rolls other than the folding roll 25 is shown.

  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.

  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 72C at appropriate intervals. The transfer roll 71A is provided with a receiving mechanism 71a that receives the cutter blade 72C at a position corresponding to the cutter blade 72C. When the secondary continuous sheet S3 is delivered from the knife roll 72 to the transfer roll 71A, the secondary continuous sheet S3 is cut (cut) by the cutter blade 72C.

  The delivery from the knife roll 72 to the transfer roll 71A is performed by a vacuum suction difference.

  The transfer roll 71A is provided with a groove that holds the front edge of the cutting sheet S4 in the rotation direction, and the front edge of the cutting sheet S4 in the rotation direction is positioned and securely held in this groove.

  The secondary continuous sheet S3 is cut such that the cutter blade 72C of the knife roll 72 enters the receiving mechanism 71a. As a result, the cutting sheet S4 is cut and held.

  In the folding mechanism part example 3, the groove part 72a is formed between the plurality of cutter blades 72C provided on the knife roll 72, the protrusion part 71c is formed on the transfer roll 71A, and the protrusion part 71c is formed on the groove part 72a. It is comprised so that a crease may be formed in cutting sheet S4 by entering.

  Next, the cutting sheet S <b> 4 is transferred from the transfer roll 71 </ b> A to the folding roll 75 with both outer surfaces interchanged. This transfer is performed by vacuum. Regarding the transfer of the cutting sheet S4 75 from the transfer roll 71A to the folding roll, the edge of the cutting sheet S4 positioned in the groove 71a of the transfer roll 71A is transferred to the folding roll 75 by the tucker mechanism and the vacuum.

  The folding roll 75 has a groove 75a at the periphery, and a grip mechanism (pick mechanism) is formed there. The size and positional relationship of the roll are formed so that the protrusion 71 c of the transfer roll 71 </ b> A enters the groove 75 c of the folding roll 75. Thereby, the sheet | seat site | part (part by which the crease is formed with the groove part 72a of the knife roll 72) located in the protrusion part 71c of the transfer roll 71A enters into the groove part 75a of the folding roll 75, and at that time by a grip mechanism The part is retained.

  The folding roll 75 rotates while holding the portion (sheet portion) that has entered the groove 75a, and releases the sheet edge portion and the sheet portion at a predetermined position. This predetermined position is determined by the relationship with the pair of folding rolls 75. For example, the grip mechanism is released at a position closest to the pair of folding rolls 75. At that time, the pair of folding rolls 75 releases the sheet edge. The tissue paper bundle 10 </ b> C is formed below the proximity position of the pair of folding rolls 75 by alternately releasing the folded portions (stripes) and the edges at the proximity positions of the pair of folding rolls 75. Is done.

  In the folding mechanism unit example 3, the formation of the folding line and the grip / release of the sheet edge, discontinuity between the folding and cutting of the secondary continuous sheet S3, and the enhancement of the suction capability in the folding roll 75 and the transfer roll 71A are achieved. Speeding up is possible. Also in the folding mechanism unit example 3, each roll adjusts its peripheral speed by a servo mechanism. Further, the position of the vacuum hole in each roll is appropriately provided in the front end portion, the rear end portion, and the intermediate portion thereof as in the folding mechanism portion example 1. Other points such as the servo mechanism and processing speed are the same as those of the folding mechanism unit examples 1 and 2.

  The example of the folding mechanism of the rotary interfolder suitable for speeding up has been described above, but the rotary interfolder X3 of the present embodiment is not limited to the above example. As long as it is possible within the scope of the present invention, the configurations of the above examples can be changed with each other.

(Applying cellulose nanofiber aqueous solution)
Next, the application process of the cellulose nanofiber aqueous solution, in this embodiment, the non-contact application process will be described.

  In this embodiment, the cellulose nanofiber aqueous solution is applied by the folding mechanism unit 85 of the rotary interfolder X3. Particularly, it is performed after cutting the secondary continuous sheet S3. In addition, as described above, the cellulose nanofiber aqueous solution can be applied in the front stage of the folding mechanism unit 85.

  Specifically, in the case of the folding mechanism part examples 1 to 3, non-contact applying means (apparatus) for the cellulose nanofiber aqueous solution are denoted by reference numerals 81 and 82. In these examples, the secondary continuous sheet S3 is cut on the bed roll 71, the transfer roll 71A, or the folding roll 75 and then held on the bed roll 71, the wrap roll 73A, the transfer roll 71A, or the folding roll 75. The cellulose nanofiber aqueous solution is applied in a non-contact manner to the cut sheet S4 from the non-contact type application means 81 and 82 arranged to face each roll. In non-contact application, no paper dust is generated because a roll or the like is not brought into contact with the sheet.

  In the present specification, non-contact type application means that cellulose nanofiber aqueous solution is once applied to a contact body such as a roll such as flexographic printing, gravure printing, roll coating, etc., and the contact body is brought into contact with the sheet surface to obtain cellulose nanofiber. It means not a method of applying a fiber aqueous solution but a method of directly applying a cellulose nanofiber aqueous solution to a sheet. Typically, there are methods such as nozzle spraying and ink jet printing.

  The non-contact type application method preferably employed is an application by ink jet printing that has high management accuracy of the application amount, application area, application pattern, etc., and is less likely to cause unevenness, more preferably equipment installation cost and equipment installation area are made small. Nozzle sprays, in particular rotor dampening sprays.

  For the cutting sheet S4, the cellulose nanofiber aqueous solution can be applied to only one surface, but it is desirable to apply it to both surfaces.

  When the cellulose nanofiber aqueous solution is applied to both surfaces of the cutting sheet S4, as shown in FIG. 11, the cellulose nanofiber aqueous solution is applied to the cutting sheet S4 held on the preceding roll A by the non-contact coating application means 81. Further, the cut sheet S4 provided with the cellulose nanofiber aqueous solution on one outer surface is transferred to the subsequent roll B so that the other outer surface is on the outside, and the cut sheet S4 held on the subsequent roll B in this state Again, the cellulose nanofiber aqueous solution is applied by the non-contact application unit 82.

  If it demonstrates by 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 a non-contact provision means with respect to the cutting sheet S4 hold | maintained on the bed roll 71 81. After the cellulose nanofiber aqueous solution is applied in a non-contact manner by 81 and the cut sheet S4 is transferred to the wrap roll 73 so that the other outer surface is on the outside, the cut sheet S4 held on the wrap roll 73 is transferred. On the other hand, the cellulose nanofiber aqueous solution is again applied in a non-contact manner by another non-contact application means 82.

  The technique of delivering the cutting sheet S4 from the front roll A to the rear roll B so that the other outer surface is the outside is the delivery method from the bed roll 71 to the wrap roll 73 described in the folding mechanism example 1 above. Suction / exhaust / stop control through a vacuum hole provided in the roll, or a mechanical sheet holding / release technique provided in each roll can be employed. Of course, it is possible to use a roll-to-roll delivery technique employed in a known inter-folder.

  If the relationship between each example 1-3 of the folding mechanism part 85 of the rotary type | formula interfolder X3 concerning this form illustrated above and the provision to the both outer surfaces of the cutting sheet S4 of cellulose nanofiber aqueous solution is demonstrated, it will fold first. About mechanism part example 1 and folding mechanism part example 3, it is the structure which can provide the cellulose nanofiber aqueous solution to both outer surfaces. That is, the folding mechanism unit example 1 can be applied in a non-contact manner in a state where the cutting 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 are provided. The non-contact type application of the cellulose nanofiber aqueous solution is possible. About the folding mechanism part example 2, since part of the front and rear cutting sheets S4 overlap when moving from the bed roll 71 to the lap roll 73A, it cannot be applied to both outer surfaces as it is. 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 73A, it can be applied to both outer surfaces.

  The folding mechanism part of the rotary type interfolder X3 according to the present embodiment is not limited to the folding mechanism part examples 1 to 3, and the folding mechanism part can be applied to both outer surfaces of the cellulose nanofiber aqueous solution. You may increase the number of rolls which comprise. As mentioned above, since the speed of the rotary interfolder can be achieved by servo, improvement of sheet holding performance to the roll by efficient suction, or separation of continuous sheet cutting and folding, having such a configuration, Appropriately, both the outer surfaces can be applied as a folding mechanism portion 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 providing cellulose cellulose fiber aqueous solution to both outer surfaces, the provision system of one outer surface and the other outer surface does not necessarily need to be the same. Spray application can be performed with the former roll, and ink jet printing can be applied with the latter roll. However, it is preferable to use both nozzle sprays, particularly rotor dampening sprays.

  For example, a softener, a surfactant, an inorganic or organic fine particle powder, an oil component, or the like may be added to the cellulose nanofiber aqueous solution as a functional agent. The softening agent and the surfactant have an effect of imparting flexibility to the tissue paper and smoothing the surface, and an anionic surfactant, a cationic surfactant and a zwitterionic surfactant are applied. The inorganic or organic fine particle powder has 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 functional agents, for example, emollients such as fragrances and various natural extracts, vitamins, emulsifiers that stabilize compounding ingredients, antifoaming agents, antifungal agents, deodorants such as organic acids, and the like are appropriately blended. be able to. Furthermore, you may contain antioxidants, such as vitamin C and vitamin E.

(Inkjet printing method)
Next, an example in which the inkjet printer 130 is used as the non-contact type imparting means 81 and 82 will be described. A known ink jet printer 130 can be used.

  If the ink jet printer 130 of this embodiment is described with reference to FIGS. 12 and 13, a tank (not shown) containing the cellulose nanofiber aqueous solution L is connected to the ink jet head 132 via the supply path 131. The cellulose nanofiber aqueous solution is supplied from the tank to the inkjet head 132 by a supply pump (not shown).

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

  The interval from the nozzle hole 134 to the cutting sheet S4 is, for example, 1 to 10 mm, preferably 1 to 3 mm. In the ink jet printing method, the amount of liquid droplets ejected from each nozzle hole 134 is extremely small, so that it is susceptible to the environment of the surrounding airflow. However, if the interval is set to 1 to 10 mm, preferably 1 to 3 mm, the influence is remarkably increased. small. In addition, the space | interval of the paper of a general full color printer and a nozzle is 1-1.5 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 application of the cellulose nanofiber aqueous solution of the present embodiment, sufficiently uniform application quality can be obtained when the dot position accuracy is within 100 μm.

  In the inkjet head 132, a plurality of ejection units 135 are arranged corresponding to the respective nozzle holes 134, and each of the ejection units 135 includes a fluid chamber 136 for temporarily storing a cellulose nanofiber aqueous solution to be ejected from the nozzle holes 134. A piezoelectric element having a diaphragm disposed in a portion facing the nozzle plate 133 with the fluid chamber 136 interposed therebetween, disposed outside the fluid chamber 136 in contact with the diaphragm, and formed by a piezoelectric element or the like (Not shown). A control device 138 is connected to the piezoelectric element via a wiring, and a voltage is applied from the control device 138 to the piezoelectric element at a predetermined interval.

  The cellulose nanofiber aqueous solution supplied from the tank to the inkjet head 132 is fed into the fluid chamber 136 that exists in correspondence with each nozzle hole 134, and the controller 138 applies a voltage to the piezoelectric element as necessary. As a result, the cellulose nanofiber aqueous solution is sprayed from the nozzle holes 134 all at once, and accordingly, the cellulose nanofiber aqueous solution is applied over the entire width of one side of the cut sheet S4. become.

  The inkjet head 132 is configured so that the compressed air 135 is supplied, and the droplets ejected from the ejection unit 135 are configured to be directed to the cut sheet S4 from the nozzle holes 134 through the compressed air. The hole 134 is configured to prevent clogging.

  In the above description, the structure in which the piezo element is employed by the on-demand method as the ink jet format has been described, but a thermal jet type may be employed. Moreover, you may employ | adopt the continuous type injection apparatus which can be continuously injected instead of an on-demand system.

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

  A more preferable condition when the aqueous solution of cellulose nanofiber is applied by adopting the ink jet printing method is that the particle velocity of the ink droplet from the nozzle hole 134 is 5 to 20 m / second, and the capacity of one ink droplet is 5 to 50 pl. / Piece.

  The ink droplets are desirably applied at intervals of 20 to 200 μm in the flow direction and the width direction, respectively. 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, an ink droplet capacity of 10 pl / piece, and a nozzle spacing of 1080 dpi in the width direction. Dot / second / line.

(Spray application method)
Next, an example of using a spray application device as the non-contact type application means 81 and 82 will be described with reference to FIGS.

  As the spray application device, a nozzle type spray device, a rotor dampening spray device or the like can be employed. A rotor dampening spraying device is preferable.

  The spray application device includes a plurality of application units having a nozzle unit, a rotor dampening unit, and the like arranged in parallel in the width direction of the cutting sheet S4 so that the spray ports thereof face the cutting sheet S4. The cellulose nanofiber aqueous solution is imparted to the cutting sheet S4 by spraying the cellulose nanofiber aqueous solution together.

  Examples of the type of spray nozzle in the nozzle type spray device include, for example, an empty conical nozzle that sprays in an annular shape, a full conical nozzle that sprays in a circular shape, a full pyramid that sprays in a square shape, a full nozzle, and a fan shape Nozzle, etc., and the nozzle diameter, the number of nozzles, the nozzle arrangement pattern, the number of nozzle arrangements, or the spraying distance, the spraying pressure, the spraying so that the cellulose nanofiber aqueous solution is sprayed uniformly in the width direction of the cutting sheet S4. An angle or the like can be appropriately selected and used.

  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. Among these, the one-fluid system sprays mist droplets from the nozzle by directly applying pressure to the cellulose nanofiber aqueous solution to be sprayed using the compressed air, or enters the nozzle from a fine hole opened on the side of the nozzle near the jet outlet. This is a method of sucking air and spraying mist. In addition, the two-fluid system is mixed with the liquid that sprays compressed air inside the nozzle, and is mixed and atomized, mixed with the liquid that sprays compressed air outside the nozzle, and externally mixed that atomizes, and atomized mist Examples include a collision type system in which the droplet particles collide with each other to further homogenize and atomize the mist droplet particles. A preferable nozzle type spraying apparatus is a two-fluid system.

  An example of a two-fluid type nozzle unit is as shown in FIG. 14, and will be further described with reference to this. The nozzle unit 110 has a cellulose nanofiber aqueous solution passage 110A at its center and an air passage 110B around it, and the cellulose nanofiber aqueous solution L ejected from the tip of the cellulose nanofiber aqueous solution passage 110A is removed from the air passage 110B. The liquid is atomized by the discharged air, and the cellulose nanofiber aqueous 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.

  In the application of the spray-applied cellulose nanofiber aqueous solution L, the droplets are swept away by the splash of the sprayed cellulose nanofiber aqueous solution or the air accompanying the surface of the cutting sheet S4, and the droplets adhere to the surface of the cutting sheet S4. For example, in the case of a nozzle type, as shown in FIG. 15, the nozzle unit 110 is sprayed from the periphery of the nozzle unit 110 by air 110G ejected from an air supply path 110F formed in the casing 110E. The cellulose nanofiber aqueous solution L can be applied to the cutting sheet S4 so as to surround the cellulose nanofiber aqueous solution L.

(Rotor dampening spray method)
Next, a particularly suitable rotor dampening spraying method among spray coating will be described. In the rotor dampening spray method, as shown in the apparatus example 140 of FIGS. 16 and 17, a plurality of rotor dampening units 141 are arranged in the width direction of the cut sheet S4.

  In each loader dampening unit 141, the fluid chamber 143 having the ejecting portion 142 is rotated at high speed, and the cellulose nanofiber aqueous solution L is sent into the fluid chamber 143, and the cellulose nanofiber aqueous solution L in the fluid chamber 143 is removed by centrifugal force. It is discharged from the injection unit 142 to form fine mist droplets. 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 143. The rotor dampening spraying method can uniformly apply a small amount of spray liquid to the surface of the cutting sheet S4 while suppressing scattering of the mist droplets, and can easily adjust the spraying speed, the particle size of the mist, and the like. There are certain advantages. Further, as in this embodiment, when the cellulose nanofiber aqueous solution L is an object to be sprayed, since the cellulose nanofibers are uniformly dispersed in the aqueous solution at the instant of spraying, the cellulose nanofibers are uniformly distributed. It is extremely excellent in giving. Cellulose nanofibers do not dissolve in water unlike various chemical solutions in a moisturizing chemical solution, and dispersibility can be a big problem.

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

  When a plurality of rotor dampening units 141 are arranged so as to be orthogonal to the flow direction of the cutting sheet S4 and installed perpendicular to the traveling cutting sheet S4, the interval between the injection holes is preferably 50 to 150 mm.

  In order to spray the cellulose nanofiber aqueous solution L uniformly on the surface of the cutting sheet S4, the atomized particle diameter of the atomized cellulose nanofiber aqueous solution L is preferably 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 surface of the cutting sheet S4, and the mist droplets are difficult to adhere to the surface of the cutting sheet S4. For this reason, in the spray application method, the spray distance, the spray pressure, the spray angle, the spray speed, in the case of the two-fluid method, the mixing ratio of the cellulose nanofiber aqueous solution L and the compressed air for spraying, the cellulose nanofiber aqueous solution L Concentration, viscosity, etc. can be adjusted as appropriate, and the particle size can be adjusted to suit the application conditions. If the influence of accompanying air is great during spraying, a suction device or baffle plate (rectifier plate) is used to remove the accompanying air. ) Addition of the above-mentioned hood, etc., charging electrode (electrostatic spraying method) etc. to improve the adhesion of the mist to the cutting sheet S4 by applying high voltage to the tip of the spray nozzle to charge the mist droplets May be.

  When the spray application method is adopted, the mass average particle diameter of the mist droplet particles is preferably 20 to 150 μm. Unlike the moisturizing chemical solution, the cellulose nanofiber aqueous solution contains tangible substances that do not dissolve in slender water, such as cellulose nanofibers. Therefore, it is preferable to set the mass average particle diameter of the mist droplet particles within the above range. is there.

  The mist droplets floating as mist without being applied to the surface of the cutting sheet S4 can be sucked and collected and sprayed again.

(Contact embossing)
In the manufacturing method of the tissue paper product X of the present embodiment, contact embossing that makes it difficult to separate the sheets can be performed.

  Although not shown, the contact embossing is provided with 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 be granted.

  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. However, the unit embossed groups may not be arranged at regular intervals, such as a staggered pattern, and the contact embosses may be arranged in one row or in two or more rows. It 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)
The long tissue paper bundle 10 </ b> C to which the cellulose nanofiber aqueous solution L having the width of the secondary raw roll R or the width of the secondary continuous sheet S <b> 3 with trimmed edges in the width direction is applied is appropriately cut (not shown). 3), the tissue paper product X is cut (cut) into the width of the tissue paper product X to form a tissue paper bundle 10.

(Storage process)
An example of storing the tissue paper bundle 10 in the storage box 2 will be described. The method for storing 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 X3.

  Specifically, the upper surface 2U, the bottom surface, and 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. Is assembled in a semi-finished state in which the bottom surface side end surface piece 23B, the side surface end surface piece 23S, and the top surface side end surface piece 23U are opened, that is, the end surface is opened, and faces the opening. Thus, the cut surface of the tissue paper bundle 10 sent from the interfolder X3 is attached.

  And if it is attached, the tissue paper bundle 10 is pushed into the storage box 2 by a push rod or the like. When the tissue paper bundle 10 is pushed into the storage box 2, the side surface end piece 23S is folded back to the inner surface side of the box, and then the upper surface side end face piece 23U and the bottom surface side end face piece 23B are folded over to overlap each other. The contact portion is bonded with a hot melt adhesive or the like. This bonding completes the manufacture of the tissue paper product X of this embodiment.

  In addition, the direction of the paper of the tissue paper 1 that constitutes the tissue paper bundle 10 manufactured by the rotary interfolder X3 according to the present embodiment is the horizontal direction along the extending direction of the folded portion of the tissue paper 1 as illustrated ( 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, in the tissue paper product X of this embodiment, as shown in FIG. 2, when the tissue paper 1 is pulled out from the storage box 2, the pulling direction is along the vertical direction (MD direction) of the tissue paper. ing.

  Instead of cutting after applying the cellulose nanofiber aqueous solution to the continuous sheet, the cellulose nanofiber aqueous solution is applied to the sheet after cutting, so there is no need to consider the tension fluctuation at the time of cutting, and cutting failure occurs. There is no. Moreover, there is no possibility that the cellulose nanofibers dried at the time of cutting are scattered.

  Since the cellulose nanofiber aqueous solution is applied on the roll of the folding mechanism part, the time from the application of the cellulose nanofiber aqueous 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 cellulose nanofiber aqueous solution after cutting and shortening the time until the folding step, the paper thickness of the sheet is not impaired, and the web bulk is easily produced, and a thick tissue paper product X can be obtained.

  In addition, since it is possible to apply the required amount of cellulose nanofiber aqueous solution to the required location in a non-contact manner, the amount applied to the lead portion at the front end of the sheet is relatively reduced, etc. When the sheet is run on the roll, the risk of the cellulose nanofiber aqueous solution being applied to or adhering to the roll can be greatly reduced, so that there is little roll contamination, and the cellulose nanofiber (aqueous solution) can be walked. Toru is also expensive.

  Furthermore, among the non-contact type application methods, the inkjet printing method or the rotor dampening spraying method can uniformly apply the cellulose nanofiber aqueous solution to the plane of the sheet by flying particles. This makes it possible to manufacture a tissue paper product that does not have defects and has a good appearance.

  Examples and comparative examples of the present invention are shown in Table 1 below.

  As shown in the column of sensory evaluation in Table 1, when a cellulose nanofiber (CNF) aqueous solution is applied to the sheet (Examples 1 to 5), particularly in the range of 10 to 25 parts by mass with respect to 100 parts by mass of the sheet. (Examples 1-3), it turns out that the smoothness of tissue paper increases to the same extent as the case where the moisturizing chemical solution is applied (Comparative Examples 5 and 6). Moreover, it turns out that it is higher also from the point of the moist feeling of tissue paper compared with the case where a moisturizing chemical solution is not applied (Comparative Examples 1 to 4). In addition, when a moisturizing chemical solution is applied, it may cause a decrease in strength and firmness, which may cause tearing during use or slipping through when sniffing, but when applying a cellulose nanofiber aqueous solution In such a case, such a state is not achieved, and the usability is excellent.

  In addition, the sensory evaluation in Table 1 was evaluated in seven stages, with “7” being the best and “1” being the worst.

  The present invention can be used as tissue paper, tissue paper manufacturing method, and tissue paper product manufacturing equipment.

  DESCRIPTION OF SYMBOLS 1 ... Tissue paper, 1e ... Edge of tissue paper folding edge, 10, 10C ... Tissue paper bundle, 2 ... Storage box, 2U ... Top of storage box (paper box), 2S ... Side of storage box (paper box), 20L ... Storage Long edge of box (paper box), 20S ... short edge of storage box (paper box), 21 ... take-out forming part (annular perforation line), 21a ... part surrounded by take-out forming part (annular perforation line), 22 ... Film, 23B ... Bottom side end face piece, 23S ... Side side end face piece, 23U ... Top face side end face piece, 24 ... Slit, 25 ... Outlet, 31 ... Head box, 32 ... Wire part, 32W ... Wire, 33 ... Press part 33F ... felt, 34, 35 ... dewatering roll, 36 ... Yankee dryer, 36C ... Yankee dryer hood, 37 ... doctor blade, 38 ... winding means, 39 ... Inning drum, 51 ... overlapping part, 55 ... slit means, 56 ... winding means, 56A ... winding drum, 52 ... calendar part, 71 ... bed roll, 71A ... transfer roll, 71a ... receiving part, 71b ... groove part, 71c ... projection, 72 ... knife roll, 72C ... cutter blade, 72a ... groove, 73, 73A ... lap roll, 73B ... count roll, 74 ... tail roll, 75 ... folding roll, 75a ... groove, 75F ... restraining roll, 76 ... Pressure roll, 77 ... Slit means, 78A ... First pull roll, 78B ... Second pull roll, 79A ... Delay roll, 79B ... Nip roll, 270 ... Vacuum hole, 271 ... Vacuum source, 80 ... Raw roll support section, 81 , 82, 81 a, 82 a ... non-contact type imparting means, 85 ... folding Structure: 86 ... Press working, 110 ... Two-fluid nozzle type moisturizing chemical spraying device, 110A ... Moisturizing chemical passage, 110B, 110F ... Air passage, 110C, 110E ... Protective casing, 110D ... Purge air passage, 110G ... Pneumatic, 130 ... Inkjet, 131 ... Supply path, 132 ... Inkjet head, 133 ... Nozzle plate, 134 ... Nozzle hole, 135 ... Injection unit, 135A ... Pressure, 136 ... Fluid chamber, 137 ... Vibration plate, 138 ... Control device 140 ... loader dampening spraying device, 141 ... rotor dampening unit, 142 ... injection unit, 143 ... fluid chamber, 144 ... injection port, 145 ... shutter, 610 ... bed roll, 611 ... knife roll, 612 ... pressure roll, 613 ... Pull roll, 620, 630 ... Roll, 6 78,679 ... Vacuum hole, 710,711,712 ... Vacuum hole, A, B ... Roll, JR ... Primary fabric roll (jumbo roll), L ... Cellulose nanofiber aqueous solution, R ... Secondary fabric roll, S1 ... Dry base paper (primary continuous sheet), S2 ... laminated continuous sheet, S3 ... secondary continuous sheet, S4 ... cut sheet, S11, S12 ... primary continuous sheet, St ... slack part, S '... continuous sheet, S "... cut sheet , W ... wet paper, X ... tissue paper product, X1 ... papermaking equipment, X2 ... secondary roll roll manufacturing equipment (ply machine), X3, X5 ... rotary interfolder.

Claims (7)

A two-ply tissue paper in which two sheets are laminated,
At least one of the sheets is provided with cellulose nanofibers derived from pulp fibers ,
The cellulose nanofiber sheet has a basis weight of 10 to 20 g / m ² according to JIS P 8124 (2011).
The paper thickness according to JIS P 8111 (1998) on the two sheets is 130 to 200 μm.
Tissue paper characterized by that. The cellulose nanofiber is applied to the sheet in a cellulose nanofiber aqueous solution having a concentration of 0.1 to 0.25% (mass / volume),
The applied amount of the cellulose nanofiber aqueous solution is 10 to 25 parts by mass per 100 parts by mass of the sheet.
The tissue paper according to claim 1. A method for producing a two-ply tissue paper in which two sheets are laminated,
At least one of the sheets is sprayed with an aqueous cellulose nanofiber solution derived from pulp fibers having a concentration of 0.1 to 0.25% (mass / volume) so as to be 10 to 25 parts by mass per 100 parts by mass of the sheet. ,
The basis weight according to JIS P 8124 (2011) of the sheet sprayed with the cellulose nanofibers is 10 to ²⁰ g / m ² ,
The thickness of the two sheets according to JIS P 8111 (1998) is set to 130 to 200 μm.
A method for producing tissue paper characterized by the above. The spray of the cellulose nanofiber is a nozzle type spray,
The manufacturing method of the tissue paper of Claim 3. The cellulose nanofiber spray is a rotor dampening spray,
A method for producing the tissue paper according to claim 3 or 4. A tissue paper manufacturing facility for storing tissue paper bundles,
An apparatus for conveying a continuous sheet;
An apparatus for cutting while holding the continuous sheet on a roll;
An apparatus for spraying an aqueous cellulose nanofiber solution derived from pulp fibers having a concentration of 0.1 to 0.25% (mass / volume) on one outer surface of the cut sheet after cutting held on the roll;
A device for replacing both outer surfaces of the cutting sheet sprayed with the cellulose nanofiber aqueous solution and sending it to a subsequent roll;
An apparatus for spraying the aqueous cellulose nanofiber solution on the other outer surface of the cutting sheet held on the subsequent roll,
A rotary interfolder in which two sheets of the cutting sheet sprayed with the cellulose nanofiber aqueous solution are sprayed on the one outer surface and the other outer surface, and folded to form a tissue paper bundle;
Have
The basis weight according to JIS P 8124 (2011) of the cutting sheet is 10 to 20 g / m ² ,
The paper thickness according to JIS P 8111 (1998) of the two laminated sheets was configured to be 130 to 200 μm.
A facility for manufacturing tissue paper products. The spray device is a rotor dampening spray device;
The spray amount of the cellulose nanofiber aqueous solution is 10 to 25 parts by mass per 100 parts by mass of the cutting sheet.
The tissue paper product manufacturing facility according to claim 6.