JP6272277B2 - Method for producing water-degradable sheet - Google Patents

Description

  The present invention relates to a method for producing a water-decomposable sheet impregnated with a chemical solution in advance such as a toilet cleaner.

Conventionally, woven cloth cloths that are used repeatedly have been used for cleaning toilets. Instead, disposable wet sheets made of paper have been used in recent years. And this type of wet sheet is preferably provided in a state of being impregnated with a cleaning agent, and can be processed by flowing into a toilet after use.
In such wet sheets, it is required to ensure paper strength that does not break in a wet state impregnated with a cleaning agent at the time of wiping work, and water disintegrability that does not clog piping etc. when flowing into a toilet or the like. However, as one technique for effectively achieving these, it is known to use a water-decomposable sheet to which a water-soluble binder containing carboxymethyl cellulose (hereinafter referred to as CMC) is added as the base paper. .

  As a method for adding the water-soluble binder, for example, between the first dry part and the second dry part in the paper making process, the binder solution is applied to the surface (one side) of the raw material sheet from a one-fluid spray nozzle. A method of spraying and a method of spraying a binder solution from a single fluid type spray nozzle on the surface (one side) of a dry sheet not containing a water-soluble binder offline are disclosed (for example, Patent Document 1).

  In the method described in Patent Document 1, since the binder solution is sprayed using a one-fluid type nozzle, it is easy to impregnate the raw material sheet with the binder solution, but the binder solution is sprayed uniformly over the entire surface of the raw material sheet. There is a problem that it is difficult. On the other hand, in the above-mentioned Patent Document 1, in the case of applying a binder solution with a two-fluid nozzle on one side of a sheet in a paper making process or offline, a liquid is applied more than when applying with a one-fluid nozzle. It is disclosed that it is excellent in that it can be dispersed and sprayed into fine particles.

Japanese Patent No. 4301996

  By the way, when the water-decomposable sheet is used as a wipe impregnated with a cleaning agent, in the operation of wiping the object, the surface of the sheet can be sufficiently wiped off without being damaged, so that the water-degradability with higher surface strength is achieved. A sheet is desired.

  This invention is made | formed in view of the said subject, and it aims at providing the manufacturing method of the water-decomposable sheet which has surface strength which is not in the past.

In order to solve the above-mentioned problem, the invention described in claim 1
A method for producing a water-decomposable sheet, wherein a substantially water-dispersible multi-ply base paper sheet containing pulp and a water-soluble binder is impregnated with an aqueous drug, and the basis weight of the multi-ply is 30 to 150 gsm,
A binder solution containing a water-soluble binder is applied to the outer surface of the papermaking sheet with a particle size of 80 to 90 μm by a two-fluid spray nozzle.

The invention described in claim 2
In the manufacturing method of the water-decomposable sheet according to claim 1,
The binder solution containing the water-soluble binder is applied to the outer surface of the papermaking sheet so that the amount of the water-soluble binder applied is 0.7% by weight or more.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the water-decomposable sheet which has the surface strength which has not existed conventionally can be provided.

It is a flowchart which shows the manufacturing method of the toilet cleaner which concerns on this embodiment. It is a schematic diagram of the toilet cleaner manufacturing equipment (solution application equipment) according to the present embodiment. It is a schematic diagram of the manufacturing equipment (processing equipment) of the toilet cleaner which concerns on this embodiment. It is the schematic which shows an example of a papermaking apparatus. It is a top view which shows an example of the toilet cleaner which concerns on this embodiment. (A) is a figure which shows the fiber orientation of the conventional paper, (b) is a figure which shows the fiber orientation of this invention. It is the enlarged view and sectional drawing of the embossed part of a toilet cleaner. It is explanatory drawing which shows an example of the contact area of embossing. It is a top view which shows another example of the toilet cleaner which concerns on this embodiment. It is a top view which shows another example of the toilet cleaner which concerns on this embodiment. It is the AA partial enlarged view of FIG. (A) is a BB cut part end elevation of Drawing 11, and (b) is a CC cut part end elevation of Drawing 11.

Hereinafter, a method for producing a water-decomposable sheet which is an embodiment of the present invention will be described in detail with reference to the drawings. However, the scope of the invention is not limited to the illustrated examples.
The water-decomposable sheet will be described by taking a toilet cleaner as an example, but the water-decomposable sheet includes wet tissue impregnated with a chemical solution for wiping purposes other than the toilet cleaner.

  FIG. 1 is a flowchart showing a method for manufacturing a toilet cleaner. FIG. 2 is a schematic view of a solution application facility for applying a binder solution to a toilet cleaner base paper sheet. FIG. 3 is a schematic view of processing equipment for processing a base paper sheet to which a binder solution is applied by the solution application equipment shown in FIG.

  In the toilet cleaner manufacturing method, as shown in FIG. 1, first, a paper making process (S1) for making a paper as a base paper by a paper machine (not shown) is performed.

  Next, as shown in FIG. 1 and FIG. 2, continuous dry base paper 1 </ b> A that is fed out from a plurality of (for example, two) primary raw rolls 1, 1, each of which is a rolled base paper wound up, in a solution application facility. A ply processing step (S2) for plying 1A to form a ply continuous sheet 1B, a solution application step (S3) for applying a binder solution to the ply continuous sheet 1B to form a continuous sheet 1C, and drying the continuous sheet 1C A drying process (S4) and a slit / winding process (S5) for slitting and winding the dried continuous water-decomposable sheet 1D are performed. The number of primary rolls can be changed as long as there are two or more. However, in the following description, an example of using two primary rolls will be described.

  Next, as shown in FIGS. 1 and 3, in the processing facility, the continuous water-decomposable sheet 1D fed out from the secondary raw roll 11 wound in the slit / winding step (S5) is embossed. An embossing process (S6) and a finishing process (S7) for finishing the embossed sheet 1E that has been embossed are performed. Details of each process will be described later.

[Paper making process]
First, the paper making process (S1) according to the present embodiment will be described. In the papermaking step (S1) of the present invention, for example, a papermaking raw material is made by a known wet papermaking technique to form a base paper sheet. That is, after making the papermaking raw material into a wet paper state, it is dried by a dryer or the like to form a base paper sheet such as thin paper or crepe paper.
As a raw material of the base paper sheet, for example, known virgin pulp, waste paper pulp and the like can be used, and at least pulp fibers are included. As the pulp used as the raw material, a blend of LBKP and NBKP in an appropriate ratio is particularly suitable. In addition, rayon fiber, synthetic fiber, etc. may contain as fibers other than a pulp fiber.
The base paper sheet of the present invention may contain an anionic acrylamide polymer (hereinafter referred to as “anionic PAM”) as a flocculant. An anionic PAM is a polymer obtained by copolymerizing an acrylamide monomer and an anionic monomer.
Examples of the acrylamide monomer include acrylamide alone or a mixture of acrylamide and the following nonionic monomer copolymerizable with acrylamide. Nonionic monomers copolymerizable with acrylamide include methacrylamide, N, N-dimethylacrylamide, N, N-diethylacrylamide, N-isopropylacrylamide, N-isopropylacrylamide, N-hydroxyethylacrylamide, diacetone. Examples include acrylamide, acryloylmorpholine, N-acryloylpyrrolidine, N-acryloylpiperidine, N-vinylrolidone, N-vinylformamide, and N-vinylacetamide. These may be used alone or in combination of two or more.
Examples of the anionic monomer include acrylic acid, methacrylic acid, acrylamide-2-methylpropanesulfonic acid, itaconic acid, maleic acid, fumaric acid, and neutralized salts thereof.
A monomer such as styrene, acrylonitrile, (meth) acrylic acid ester, or the like may be blended as long as the water solubility of the anionic PAM is not impaired.
The addition amount of the anionic PAM is preferably about 10 to 1000 ppm. By making paper using such an anionic flocculant having the same charge as pulp, the aggregation of the base paper sheet can be reduced, and the water disintegrability can be improved by capillary action.
In addition to the above-described pulp and flocculant, papermaking chemicals such as a wet paper strength agent, an adhesive, and a release agent may be appropriately used for the base paper sheet.
Moreover, in embodiment of this invention, although a binder solution is provided in the solution provision process of the solution provision equipment mentioned later, you may make it provide a binder solution in the step of a papermaking process.
When a binder solution is applied even in the paper making process, the strength of the entire water-decomposable sheet can be increased, and by further applying a binder solution in the solution-applying process in the subsequent process, the surface strength of the water-decomposable sheet is further increased. Can be raised.

  As a method for applying the binder solution in the papermaking process, for example, a water-soluble binder and a fixing agent to the pulp fiber of the water-soluble binder are added to a dispersion liquid containing pulp as a papermaking raw material, and this is used as a raw material. A paper making method is known (Japanese Patent Laid-Open No. 3-193996). That is, it is a method of internally adding a water-soluble binder. Alternatively, a sheet made from a pulp-containing dispersion may be wet-papered, press dehydrated or semi-dried, and then a water-soluble binder may be spray-dried or coated and dried to produce a fiber sheet containing a predetermined amount of the water-soluble binder. Is possible. That is, it is a method of externally adding a water-soluble binder. In this case, a fiber sheet having a lower density and better water disintegration can be obtained by using a pre-drying system such as a hot-air passing dryer than performing press dewatering. Furthermore, instead of the above-mentioned wet papermaking method, it is also possible to produce a fiber sheet by drying fiber pulp dry without using water, forming a web, spraying a water-soluble binder, and then drying. . This is the so-called airlaid manufacturing method.

  FIG. 4 shows a schematic diagram of an example of a production apparatus preferably used for producing a fiber sheet when a water-soluble binder is used as the binder. The manufacturing apparatus (wet papermaking machine) shown in FIG. 4 includes a former 14, a wire part, a first dry part 17, a spray part, and a second dry part 24.

  The former 14 adjusts the furnish supplied from a preparation device (not shown) to a predetermined concentration and supplies it to the wire part. A preparation device (not shown) includes a device that beats and beats raw materials such as pulp fibers, and an addition device that adds additives such as sizing agents, pigments, paper strength enhancers, bleaching agents, and flocculants to the beaten and beaten raw materials. And a stock made of a raw material having a predetermined concentration according to the characteristics of hydrolyzed paper is prepared as a finished stock. It is also possible to mix a binder with the pulp slurry. The wire part is a wet paper that forms the paper stock supplied from the former as a wet paper. The first dry part 17 dries the wet paper formed in the wire part. The spray part sprays the binder onto the paper dried by the first dry part 17. The 2nd dry part 24 dries the paper which has been sprayed with the binder and is wet.

  The furnish supplied from the former 14 is made in the wire part, and a wet paper is formed on the wire 15. Water is removed from the wet paper by suction by a suction box 16 installed in the wire part, and the wet paper has a predetermined moisture content. Next, the wet paper is introduced into the first dry part 17 and dried. The first dry part 17 is composed of a through air dryer (hereinafter referred to as TAD). The TAD includes a rotating drum 18 having a breathable peripheral surface, and a hood 19 that covers the rotating drum 18 almost airtightly. In TAD, air heated to a predetermined temperature is supplied into the hood 19. The heated air flows from the outside of the rotating drum 18 toward the inside. The wet paper web is transported while being held on the peripheral surface of the rotating drum 18 rotating in the direction of the arrow in FIG. While being transported in the TAD, the heated paper penetrates the wet paper in the thickness direction, whereby the wet paper is dried to become paper.

  The paper obtained in the first dry part 17 is sprayed with an aqueous solution (binder solution) containing a binder in the spray part. The spray part is a position between the first and second dry parts 17 and 24. Both dry parts 17 and 24 are connected via a conveyor.

  The conveyor includes an upper conveyor belt 20 and a lower conveyor belt 21 that rotate in the directions indicated by the arrows. The conveyor 20 is configured to convey paper to the second dry part 24 while being dried by the TAD of the first dry part 17 and sandwiching the paper between the belts 20 and 21. A vacuum roll 22 is disposed at the folded end on the downstream side of the upper conveyor belt 20. The vacuum roll 22 adsorbs paper on the back surface of the upper conveyor belt 20 and conveys the upper conveyor belt 20 under the adsorbed state.

  As shown in FIG. 4, the spray part includes a spray nozzle 23. The spray nozzle 23 is disposed below the second dry part 24 and so as to face the vacuum roll 22. The spray nozzle 23 sprays a spray liquid containing a binder toward the vacuum roll 22 and adds (externally adds) the spray liquid to paper.

  After the binder is supplied in the spray part, the paper is conveyed to the second dryer part 24. The second dryer part 24 is composed of a Yankee dryer. The paper that has been sprayed with the spray liquid and is in a wet state is conveyed while being held on the peripheral surface of the rotary drum 25 of the Yankee dryer installed in the hood 26. The paper is dried while being held by the rotary drum 25 and conveyed.

  The position for supplying the binder in the spray part may be a position between the first and second dry parts 17 and 24. For example, the position above the upper conveyor belt 20 (the first and second dry parts shown in FIG. 4). You may make it spray a binder from the arrow position between 17 and 24). Further, the binder may be sprayed from above (the arrow position on the right side of the second dry part 24 shown in FIG. 4) on the paper after being dried by the second dry part 24. In addition, the direction in which the binder is sprayed between the first and second dry parts 17 and 24 and after the second dry part 24 is not limited to the upper direction, and may be from the lower side or from the upper and lower sides.

  In the present embodiment, in the paper making process, adjustment is performed so that the ratio of vertical and horizontal fiber orientations (vertical / horizontal) of the base paper sheet is 0.8 to 2.0, preferably 1.0. The fiber orientation can be adjusted, for example, by adjusting the angle at which the papermaking raw material is supplied to the wire part in a paper machine. The angle at which the papermaking raw material is supplied can be determined, for example, by adjusting the slice opening degree of the head box. Or it is good also as adjusting fiber orientation by giving a vibration in the direction orthogonal to the conveyance direction (running direction) of a paper machine.

[Continuous dry base paper]
As the continuous dry base paper 1A, thin paper and crepe paper produced in the paper making step (S1) are preferably used. The raw material of the continuous dry base paper 1A is not particularly limited, but known virgin pulp, waste paper pulp, and the like can be used. It is desirable to include at least pulp. Thereby, the fixing of CMC and the action of the cleaning agent and CMC are effectively exhibited. As the raw material pulp, a mixture of hardwood bleached kraft pulp (LBKP) and softwood bleached kraft pulp (NBKP) in an appropriate ratio is particularly suitable. Specifically, it is preferable that the blending ratio of the softwood bleached kraft pulp to the hardwood bleached kraft pulp is 3/7 to 1/1. By increasing the blending ratio of the hardwood bleached kraft pulp to the softwood bleached kraft pulp, the inter-fiber gap is reduced. Therefore, in the solution application step (S3) described later, when the binder solution is sprayed on the outer surface of the ply continuous sheet 1B (the one obtained by plying a plurality of continuous dry base papers 1A), the binder solution is difficult to penetrate into the sheet. Therefore, the obtained toilet cleaner is in a state in which the content of CMC increases from the center in the thickness direction toward the front and back surfaces. As a result, the toilet cleaner can improve the surface strength while ensuring water decomposability, and it is possible to manufacture a toilet cleaner that is less likely to be damaged even when rubbed strongly.

As physical properties of the continuous dry base paper 1A, the basis weight is preferably about 15 to 75 gsm. Moreover, the basis weight of the ply-processed sheet containing the water-soluble binder (continuous water-decomposable sheet 1D) is about 30 to 150 gsm. The basis weight is based on JIS P 8124.
The continuous dry base paper 1A becomes a ply-processed hydrolyzed paper through a ply processing step (S2), a solution application step (S3), a drying step (S4), and a slit / winding step (S5), which will be described later. The toilet cleaner is processed through the embossing process (S6) and the finishing process (S7).

[Ply processing process]
Next, the ply processing step (S2) of this embodiment will be described. In the ply processing step (S2), as shown in FIG. 2, the continuous dry base papers 1A and 1A continuously fed from the raw roll 1 are ply processed along the continuous direction to form a ply continuous sheet 1B. It is supplied to the mating unit 2. The overlapping portion 2 is composed of a pair of rolls, and plies each continuous base paper 1A, 1A to form a ply continuous sheet 1B subjected to ply processing. In addition, when the continuous dry base papers 1A and 1A are overlapped, the continuous dry base papers 1A and 1A may be lightly fastened with pin embossing (contact embossing) so that they are not easily displaced.

[Binder solution]
Next, the binder solution will be described. The binder solution contains carboxymethyl cellulose (CMC) as a water-soluble binder. The concentration of carboxymethyl cellulose in the binder solution is 0.6 to 10% by weight, preferably 0.7% to 4% by weight.

  On the other hand, the degree of etherification of CMC is desirably 0.6 to 2.0, particularly 0.9 to 1.8, and more preferably 1.0 to 1.5. The expression of water disintegration and wet paper strength is very good.

  Moreover, CMC can use a water-swellable thing. This demonstrates the function of tying together the fibers that make up the sheet while remaining unswelled by crosslinking of specific metal ions in the cleaning agent, and can exhibit strength as a wiping sheet that can withstand cleaning and wiping operations. .

  Ingredients other than carboxymethylcellulose in the binder solution include polyvinyl alcohol, starch or derivatives thereof, hydroxypropylcellulose, sodium alginate, tolton gum, guar gum, xanthan gum, gum arabic, carrageenan, galactomannan, gelatin, casein, albumin, pull plan, poly Examples thereof include binder components such as ethylene oxide, viscose, polyvinyl ethyl ether, polyacrylic acid soda, polymethacrylic acid soda, polyacrylamide, hydroxylated derivatives of polyacrylic acid, and polyvinylpyrrolidone / vinylpyrrolidone vinyl acetate copolymer.

It is preferable to use a water-soluble binder having a carboxyl group from the viewpoint of good water decomposability and the point that wet strength can be expressed by a crosslinking reaction.
The water-soluble binder having a carboxyl group is an anionic water-soluble binder that easily forms a carboxylate in water. Examples thereof include polysaccharide derivatives, synthetic polymers, and natural products. Examples of the polysaccharide derivative include a salt of carboxymethyl cellulose, carboxyethyl cellulose or a salt thereof, carboxymethylated denven or a salt thereof, and an alkali metal salt of carboxymethyl cellulose is particularly preferable.

  Examples of the synthetic polymer include a salt of an unsaturated carboxylic acid polymer or copolymer, a salt of a copolymer of an unsaturated carboxylic acid and a monomer copolymerizable with the unsaturated carboxylic acid, and the like. Examples of the unsaturated carboxylic acid include acrylic acid, methacrylic acid, itaconic acid, crotonic acid, maleic anhydride, maleic acid, and fumaric acid. Examples of monomers that can be copolymerized with these include esters of these unsaturated carboxylic acids, vinyl acetate, ethylene, acrylamide, and vinyl ether. Particularly preferred synthetic polymers are those using acrylic acid or methacrylic acid as the unsaturated carboxylic acid. Specifically, polyacrylic acid, polymethacrylic acid, acrylic acid-methacrylic acid copolymer salt, acrylic acid or methacrylic acid. Examples thereof include a salt of a copolymer of an acid and an alkyl acrylate or an alkyl methacrylate. Examples of natural products include sodium alginate, xanthan gum, gellan gum, tarragant gum, pectin and the like.

[Solution application process]
Next, the solution application step (S3) of this embodiment will be described. In the solution application step (S3), as shown in FIG. 2, two fluids are formed on both outer surfaces of the ply continuous sheet 1B (the surfaces where the continuous dry base papers 1A and 1A do not face each other when the continuous dry base papers 1A and 1A are plyed). The above-mentioned binder solution is sprayed by each type of spray nozzles 3 and 3 to produce a continuous sheet 1C.
In addition, as a spraying method of a binder solution, you may make it spray the above-mentioned binder solution on the one outer surface of the ply continuous sheet 1B. Further, the above-described primary raw rolls 1 and 1 are fed from the two-fluid type spray nozzle to the outer surface (the surface where the sheets do not face each other) of at least one of the continuous dry base papers 1A and 1A fed from the primary raw rolls 1 and 1 respectively. You may make it produce | generate the sheet | seat equivalent to the above-mentioned continuous sheet 1C by spraying a binder solution and carrying out the ply process of the said continuous dry base paper 1A, 1A immediately after.

The two-fluid spray nozzle 3 is a spray nozzle that mixes and sprays compressed air and liquid divided into two systems, compared to a one-fluid spray nozzle that sprays compressed liquid alone, The liquid can be sprayed finely and uniformly.
In this embodiment, the nozzle diameter of the spray nozzle 3 is less than 0.06 gal / min. Moreover, as spray conditions of this embodiment, the density | concentration of binder solution; Less than 4%, the viscosity of binder solution; 400-1300 MPa. s, discharge temperature: 50-70 ° C., liquid pressure: 2 MPa or more, air pressure: 0.05-0.2 MPs, and the particle diameter when jetting the binder solution is preferably 80-90 μm. Moreover, it is preferable to spray a binder solution so that the addition amount of a binder (CMC) may be 0.7 weight% or more with respect to a base paper (ply continuous sheet 1B).

  In this way, by spraying the binder solution on the outer surface of the ply continuous sheet 1B, the toilet cleaner can be removed from the center in the thickness direction (when applied on both sides) or the non-application surface of the binder solution (when applied on one side). As the content of the water-soluble binder increases as it goes to the application surface of the binder solution, it can improve the surface strength while ensuring water disintegration, and produce a toilet cleaner that is resistant to damage even when rubbed strongly. It becomes possible to do.

[Drying process]
Next, the drying step (S4) of this embodiment will be described. In the drying step (S4), as shown in FIG. 2, in the drying facility 4, the insoluble liquid in the binder solution of the continuous sheet 1C is evaporated to fix the active ingredient, particularly CMC, to the fibers. .
Here, since the amount of the binder solution that permeates decreases from the outer surface of the continuous sheet 1C toward the inside in the thickness direction, the fixing amount of CMC decreases toward the inside in the thickness direction. Therefore, when the chemical solution is impregnated in the finishing step (S7) described later, the cross-linking reaction hardly occurs as it goes inward in the thickness direction, and since there are many voids, the chemical solution is confined inside the sheet. be able to. Thereby, the toilet cleaner obtained can be made hard to dry. In addition, since many CMC cross-linking reactions occur in the vicinity of the outer surface of the continuous sheet 1C, the surface strength of the resulting toilet cleaner can be strengthened.
As the drying equipment 4, a hooded dryer equipment that blows hot air on the continuous sheet 1C to dry it can be used. In order to make the sheets more closely contact each other, a press roll or a turn roll may be installed, and the continuous sheet 1C may be passed through the press roll or the turn roll before the drying step (S4).

  Moreover, you may use the installation by infrared irradiation as said drying installation. In this case, a plurality of infrared irradiation units are arranged in parallel in the conveying direction of the continuous sheet 1C, and drying is performed by irradiating the continuous sheet 1C to be conveyed with infrared rays. Since moisture is generated by infrared rays and dried, uniform drying is possible as compared with a dryer using hot air, and wrinkles can be prevented from occurring in the subsequent slit / winding process.

[Slit and winding process]
Next, the slit / winding step (S5) of this embodiment will be described. In the slit / winding step (S5), in order to use the ply-processed continuous water-decomposable sheet 1D with an off-line processing machine, it is dried in the drying step (S4) and the CMC is fixed. The illustrated continuous water-decomposable sheet 1D is slit to a predetermined width by the slitter 5 while adjusting the tension, and wound by the winder facility 6. The winding speed is appropriately determined in consideration of the ply processing step (S2), the solution application step (S3), and the drying step (S4). Note that if it is too early, the sheet will break, and if it is too late, wrinkles will occur.
In the slit / winding step (S5), the continuous water-decomposable sheet 1D subjected to the ply process is pressure-bonded, whereby the continuous water-decomposable sheet 1D is more integrated and becomes a sheet corresponding to one sheet.

[Embossing process]
Next, the embossing process (S6) of this embodiment will be described. In the embossing step (S6), as shown in FIG. 3, the embossing roll 12 has an embossing process that forms a predetermined shape on the entire surface of the continuous water-decomposable sheet 1D that is fed from the secondary raw roll 11. Applied. This embossing is performed for the purpose of improving the strength, bulkiness, wiping property and the like of the sheet, as well as the design.

[Finishing process]
Next, the finishing process (S7) of this embodiment will be described. In the finishing process (S7), as shown in FIG. 3, the finishing machine 13 cuts the embossed sheet 1E, folds each cut sheet, and chemicals (water based) on each sheet that has been folded. Including a cleaning agent, a fragrance, a preservative, a disinfectant, a paper strength enhancer, an organic solvent, etc.), and packaging of each sheet impregnated with the chemical solution is performed in a series of flows.
A toilet cleaner is manufactured through the above steps.

As said chemical | medical solution, a suitable thing can be used, For example, a lower or higher (aliphatic) alcohol other than surfactant can be used as an aqueous cleaning agent. As a fragrance | flavor, 1 type or several types can be suitably selected and used out of oil-based fragrance | flavors, such as orange oil other than an aqueous | water-based fragrance | flavor. As the preservative, for example, parabens such as methyl paraben, ethyl paraben, propyl paraben and the like can be used. As a disinfectant, for example, benzalkonium chloride, chlorhexidine gluconate, popidone iodine, ethanol, benzilium cetyl oxide, triclosan, chlorxylenol, isopropylmethylphenol and the like can be used. As the paper strength enhancer (crosslinking agent), boric acid, various metal ions, and the like can be used. As the organic solvent, polyhydric alcohols such as glycol (divalent), glycerin (trivalent), and sorbitol (tetravalent) can be used.
The cross-linking agent contained in the chemical solution is preferably a polyvalent metal ion when CMC is used as a water-soluble binder. In particular, the use of one or more polyvalent metal ions selected from the group consisting of alkaline earth metals, manganese, zinc, cobalt, and nickel allows the fibers to be sufficiently bonded to withstand use. It is preferable from the standpoint that strength is developed and water disintegration is sufficient. Of these metal ions, it is particularly preferable to use ions of calcium, strontium, barium, zinc, cobalt, and nickel.

Next, the configuration of the toilet cleaner will be described. In addition, the paper conveyance direction at the time of manufacture of a toilet cleaner is demonstrated as a Y direction (vertical direction), and the direction orthogonal to a conveyance direction is set as an X direction (horizontal direction).
The toilet cleaner 100 is obtained by plying (stacking) a plurality of (for example, two) base paper sheets, and is impregnated with a predetermined chemical solution. Moreover, as shown in FIG. 5, two types of embossing EM11 and EM12 are given to the whole sheet | seat surface of the toilet cleaner 100 by embossing. The contact area between the two embossing EM11 and such cleaning object caused by EM12 is, 100 mm ² per ^is preferably 15 mm 2 ～30Mm ² about.

  For example, by arranging the embossed EM11 to be a rhombus lattice, it is possible to reduce wiping unevenness compared to the case where the embossed EM11 is disposed in a square lattice or a rectangular lattice. Further, the embossing EM12 is disposed between the embossing EM11.

  Further, the toilet cleaner 100 is folded into two at the center in the Y direction by being folded. Then, it is stored in a folded plastic case, packaging film, etc. in a folded state, and is expanded and used as needed during use. Note that the method of folding the toilet cleaner 100 is not limited to two, and may be, for example, four or eight.

  In addition, the base paper sheet of the toilet cleaner 100 of the present embodiment is composed of a water-decomposable fiber assembly so that the toilet paper can be discarded as it is in a toilet pool after cleaning the toilet.

  As the fiber assembly, fibers obtained by mixing hardwood bleached kraft pulp (LBKP) and softwood bleached kraft pulp (NBKP) are used. As a suitable raw material fiber, the component ratio of the hardwood bleached kraft pulp exceeds 50% by weight, that is, the blending ratio of the softwood bleached kraft pulp to the hardwood bleached kraft pulp is less than 1/1. Can be given. By increasing the compounding ratio of hardwood bleached kraft pulp to softwood bleached kraft pulp, gaps between fibers are reduced and moisture transpiration is suppressed, so that the difficulty of drying can be improved. Further, in order to improve the surface strength of the base paper sheet that is the base material of the toilet cleaner 100, a solution containing carboxymethyl cellulose (CMC) is applied to the base paper sheet from the front and back as a binder solution for enhancing paper strength. The toilet cleaner 100 is in a state in which the content of CMC increases from the center in the thickness direction toward the front and back surfaces. As a result, the toilet cleaner 100 is less likely to be broken even if the edge of the toilet bowl is rubbed more strongly than a conventional product that is uniformly impregnated with a water-soluble binder.

Further, the toilet cleaner 100 preferably has a ratio of vertical and horizontal fiber orientation (vertical / horizontal) of 0.8 to 2.0, and more preferably 1.0.
In the paper making process, which is a paper manufacturing process, fibers are spread on the wire of the paper machine and flow in the transport direction. Therefore, in general, the paper is lined with many fibers in the machine direction of the paper machine. (For example, vertical: horizontal = 2.3: 1, etc., see FIG. 6A). Therefore, the fiber density in the lateral direction is thin and the fiber is easy to tear. That is, it is easy to tear depending on the direction of wiping. Therefore, in this embodiment, as shown in FIG. 6 (b), the vertical and horizontal fiber orientation ratio of the toilet cleaner 100 is set to 0.8 to 2.0, preferably 1.0. It is possible to provide a toilet cleaner 100 that is hard to tear even if wiped. The ratio of the vertical and horizontal fiber orientations can be determined by the ratio of the wet strength in the MD and CD directions.

  In addition, the toilet cleaner 100 of the present embodiment is impregnated with a predetermined chemical solution (aqueous drug). Specifically, in addition to an aqueous cleaning agent, a fragrance, an antiseptic, a disinfectant, a paper strength enhancer, A predetermined chemical solution containing an auxiliary agent such as an organic solvent is impregnated. The chemical solution is preferably impregnated in an amount of 150 to 300% by weight with respect to the weight of the base paper sheet that is the base material of the toilet cleaner 100.

  In addition, the above-mentioned auxiliary agent for the component of the chemical solution can be appropriately selected, and a component that performs other functions may be included in the chemical solution as necessary.

  As shown in FIG. 7A, the embossed EM11 has a bulged portion PR21 having a curved shape.

  Moreover, as shown in FIG.7 (b), the embossing EM12 has the planar shape in the bulging part PR22.

And since the embossing EM12 is arrange | positioned between the embossing EM11, when the bulging part PR21 of embossing EM11 and the bulging part PR22 of EM12 adjoin and adjoin, as shown in FIG.7 (c), it continues. The embossed EM21 is formed.
Moreover, the case where the bulging part PR21 of the embossing EM11 and the bulging part PR22 of the embossing EM12 are only close to each other and may not be continuous may be used.

  Since the two types of embosses EM11 and EM12 formed in this way can increase the contact area with the object to be cleaned and the like, the hardness of the toilet cleaner 100 is reduced and the wiping performance is improved.

  That is, by forming the embossed EM11 whose bulged portion PR21 is a curved surface and the embossed EM12 whose bulged portion PR22 is a flat surface on the entire sheet surface of the toilet cleaner 100, the toilet cleaner 100 is powered during wiping work. When each emboss is deformed, the contact area is increased for the first time. Therefore, the contact area is increased, and the flexibility is improved due to the deformation of each emboss.

  For example, as shown in FIG. 8A, in the case of a single emboss EM11, the contact area CN31 generated by the deformation of the emboss EM11 due to the force applied to the toilet cleaner 100 during the wiping operation is discrete in the vicinity of the emboss EM11. Will occur. On the other hand, when two types of embossing EM11 and EM12 are combined, as shown in FIG. 8B, the contact generated by the deformation of the embossing EM11 and EM12 due to the force applied to the toilet cleaner 100 during the wiping operation. It can be seen that the area SN32 increases as compared with the contact area CN31 of FIG.

  Moreover, the two types of embossing EM11 and EM12 can similarly obtain the effect of normal embossing, and can improve the texture, absorbability, bulkiness, and the like of the toilet cleaner. Furthermore, the continuous embossing EM21 can also obtain the effect of the appearance by giving embossing similarly to normal embossing.

  Next, as in this embodiment, a binder solution containing CMC (water-soluble binder) is applied to the outer surface of the ply continuous sheet (paper sheet) 1B with a two-fluid spray nozzle at a particle size of 80 to 90 μm. Table 1 shows the results of evaluating the damage when rubbed strongly for the toilet cleaners (Examples 1 to 6) and the toilet cleaners (Comparative Examples 1 to 7) that do not satisfy the application conditions of the binder solution. To do.

<Conditions for implementation>
(1) Implementation conditions common to each of Examples 1 to 6 and Comparative Examples 1 to 6 are as follows.
Base paper material: 100% pulp
Pulp blending; NBKP: LBKP = 50: 50
Weighing: 45 g / m ²
Ply number; 2-ply water-soluble binder; CMC
Binder solution coating method; spray coating (two-fluid system)
Chemical solution component: Surfactant, glycol ether, disinfectant, fragrance, water and other chemical solution impregnation rate: 200%
Embossing: Existence (2) The implementation conditions of Comparative Example 7 are as follows.
Base paper material: 100% pulp
Pulp blending; NBKP: LBKP = 50: 50
Weighing: 45 g / m2
Ply number; 2-ply water-soluble binder; CMC
Binder solution coating method; spray coating (one-fluid system)
Chemical solution component: Surfactant, glycol ether, disinfectant, fragrance, water and other chemical solution impregnation rate: 200%
Embossing: Yes

<Binder solution application conditions>
The application | coating conditions of each binder solution of Examples 1-6 and Comparative Examples 1-7 are as follows.
Example 1 Binder coating amount: 0.6% by weight
Particle size of binder solution during jetting; 80 μm
Example 2 Binder coating amount: 0.6% by weight
Particle size of binder solution during jetting: 90 μm
Example 3 Binder coating amount: 0.7% by weight
Particle size of binder solution during jetting; 80 μm
Example 4 Binder coating amount: 0.7% by weight
Particle size of binder solution during jetting: 90 μm
Example 5 Binder coating amount: 1.0% by weight
Particle size of binder solution during jetting; 80 μm
Example 6 Binder coating amount; 1.0% by weight
Particle size of binder solution during jetting: 90 μm
Comparative Example 1 Binder coating amount: 0.6% by weight
Particle size of binder solution during jetting; 60 μm
Comparative Example 2 Binder coating amount: 0.6% by weight
Particle size of the binder solution during jetting: 100 μm
Comparative Example 3 Binder coating amount: 0.7% by weight
Particle size of binder solution during jetting; 60 μm
Comparative Example 4 Binder coating amount: 0.7% by weight
Particle size of the binder solution during jetting: 100 μm
Comparative Example 5 Binder coating amount: 1.0% by weight
Particle size of binder solution during jetting; 60 μm
Comparative Example 6 Binder coating amount: 1.0% by weight
Particle size of the binder solution during jetting: 100 μm
Comparative Example 7 Binder coating amount: 1.0% by weight
Particle size of binder solution during jetting: 90 μm

<Test method>
Cut the test piece (toilet cleaner) into a width of 75 mm x length of 240 mm without peeling off the ply, fold it in three so that both end regions in the width direction overlap, and rub the measured part with a Gakushin type friction fastness tester Then, the number of times at which damage such as fluffing or tearing is visually confirmed on the paper surface is measured. The test conditions with the Gakushin type friction fastness tester are as follows.
・ Gakushin friction fastness tester: Tester Sangyo Co., Ltd., part number AB301
・ Friction element: Shape □ 20mm × R50mm
Load 200gf (including white cotton cloth stopper and arm)
Load per unit area 50 gf / cm ² (load 200 gf / contact area 4.0
cm ² )
PP band (Sekisui Jushi Corporation part number 19K (width 15mm)
× Length 60mm)) Be careful not to create gaps or wrinkles on one sheet.
Secure to the friction element with a tie stop.
・ Sample stage: Shape R200mm
Stroke 120mm
Round trip speed 30 cps
・ Test piece (toilet cleaner): width 25mm (ply is not peeled and 75mm width is folded in three)
× Length 240mm (sample stage side)
Test procedure: (1) Mount the test piece on the sample stage so as not to loosen.
(2) Gently lower the friction element onto the sample table.
(3) Start test by pressing start SW.
・ Judgment method: Check the condition of the test piece by swaying, and visually check for fluffing and tearing.
The number of times when such damage was confirmed was measured.

In the above test, assuming a scene where the toilet cleaner is actually used, that is, assuming that the edge of the toilet bowl is rough due to contamination, a PP band with a mesh pattern on the surface is used as a school pendulum. ing. As a result, an environmental test can be performed assuming that the toilet cleaner is actually used, and a highly reliable evaluation can be made as to whether or not the toilet cleaner can withstand the actual use.

  As shown in the test results shown in Table 1, Examples 1 to 6 have stronger surface strength than Comparative Examples 1 to 7, and fluffing and tearing when rubbed strongly in an environment assuming actual use. It was found that the damage was difficult to occur. That is, it turned out that it has strong surface strength by setting the particle diameter of the said binder solution at the time of spraying the binder solution in a solution provision process (S3) to 80-90 micrometers like Examples 1-6. Furthermore, as in Examples 3 to 6, by applying a binder solution containing the CMC so that the coating amount of CMC (water-soluble binder) is 0.7% by weight or more, stronger surface strength can be obtained. I found it.

As mentioned above, although this invention was concretely demonstrated based on embodiment, this invention is not limited to the said embodiment, It can change in the range which does not deviate from the summary.
For example, in describing the embodiments of the present invention, CMC is used as the water-soluble binder, but polyvinyl alcohol (PVA) may be used.

  In the description of the embodiment of the present invention, the embossed EM11 in which the bulging part PR21 has a curved shape and the embossed EM12 in which the bulging part PR22 has a flat shape are illustrated. However, it is not necessarily limited to this shape, For example, the bulging part of embossing EM11 and embossing EM12 may be a planar shape from which height differs. Further, for example, the bulging portion of the emboss EM 11 may be a flat shape, and the bulging portion of the emboss EM 12 may be a curved shape.

  In other words, there are two types of embossing (first embossing and second embossing) in which the shape of the bulging part is not the same shape, and the second embossing is arranged around the first embossing. If it exists, the shape of the bulging portion of each emboss may be any shape.

  In the description of the embodiments of the present invention, the embossed EM12 having a flat bulge is disposed between the embossed EM11 having a bulged portion, but the embossed EM11 intersects each other. Also good.

  Further, in the description of the embodiment of the present invention, all the embosses EM11 and EM12 are convex in the drawing front direction of FIG. 5, but the embossing EM11 and EM12 convex in the drawing front direction and the drawing front direction are shown. Alternatively, the concave embosses EM11 and EM12 may be alternately arranged.

  For example, as shown in FIG. 9, embosses EM11 and EM12 (solid line portions) convex in the front direction of the drawing in FIG. 9 and embossments EM11 and EM12 (broken line portions) concave in the front direction of the drawing in FIG. Thus, it is possible to increase the surface strength of the water-decomposable sheet by embossing and to provide a water-decomposable sheet having high wiping performance on both surfaces of the toilet cleaner 100.

  In the description of the embodiment of the present invention, the bulging portion PR21 of the emboss EM11 and the bulging portion PR22 of the EM12 are formed as a continuous embossing EM21 by closely adhering to each other. The bulging portion PR21 and the bulging portion PR22 of the EM 12 may be close to each other but not closely attached.

  In the description of the embodiment of the present invention, the shape of the emboss EM 11 is exemplified as a circular shape or an elliptical shape, but the emboss shape may be any shape such as a square or a polygon.

  Moreover, it is preferable that height HT21 and HT22 of the bulging part of embossing EM11 and EM12 in FIG. 7 are 0.40 mm-0.75 mm, for example. The height of the bulging portion of the emboss can be measured by measuring the surface in 3D with a Keyence digital microscope.

  For example, if the height is less than 0.40 mm, the friction at the time of wiping becomes strong and difficult to wipe, and if the height exceeds 0.75 mm, the shapes of the embosses EM11 and EM12 are liable to break during packaging. It looks bad.

  Moreover, the embossing pattern of the toilet cleaner is not limited to the above-described pattern. 10 is a plan view of a toilet cleaner 101 in which only the embossing pattern of the toilet cleaner 100 is changed, FIG. 11 is an enlarged view of a portion AA in FIG. 10, and FIG. 12A is a BB cut portion in FIG. An end view, FIG.12 (b) is CC end part end view of FIG.

  10-12, the recessed part e2 is the shape which reversed the convex part e1. The convex portions e1 and the concave portions e2 are alternately arranged as an example, and this row forms an emboss pattern in which the rows are arranged in multiple rows and the convex portions e1 and the concave portions e2 in adjacent rows are shifted from each other by a half pitch. . As described above, the convex portions e1 and the concave portions e2 are alternately formed both in the vertical direction and in the horizontal direction, so that the wiping property of dirt is improved compared to the embossed pattern in which the convex portions and the concave portions are arranged in a line. Can be made. In addition, the shape of the convex part e1 and the recessed part e2 is not specifically limited, Circular, an ellipse, a polygon etc. are used. It is good also as what combined each shape.

100, 101 Toilet cleaner 1 Primary raw roll 1A Continuous dry base paper 1B Ply continuous sheet 1C Continuous sheet 1D Continuous water-decomposable sheet 1E Embossed sheet 2 Superposition part 3 Spray nozzle 4 First drying equipment 5 Slitter 6 Winder equipment 11 2 Next fabric roll 12 Embossing roll 13 Finishing processing equipment 14 Former 15 Wire 16 Suction box 17 First dry part 18 Rotary drum 19 Hood 20 Upper conveyor belt 21 Lower conveyor belt 22 Vacuum roll 23 Spray nozzle 24 Second dry part 25 Rotary drum 26 Hood EM11 Emboss EM12 Emboss PR21 Swelling part PR22 Swelling part HT21 Swelling part height HT22 Swelling part height CN31 Contact area SN32 Contact area e1 Convex part e2 Concave part

Claims (2)

A method for producing a water-decomposable sheet, wherein a substantially water-dispersible multi-ply base paper sheet containing pulp and a water-soluble binder is impregnated with an aqueous drug, and the basis weight of the multi-ply is 30 to 150 gsm,
A method for producing a water-decomposable sheet, wherein a binder solution containing a water-soluble binder is applied to the outer surface of a papermaking sheet with a particle size of 80 to 90 μm by a two-fluid spray nozzle.   2. The hydrolytic solution according to claim 1, wherein a binder solution containing the water-soluble binder is applied to the outer surface of the papermaking sheet so that a coating amount of the water-soluble binder is 0.7 wt% or more. Manufacturing method of adhesive sheet.

Images