JP6603067B2 - Manufacturing method of household thin paper - Google Patents

Description

  The present invention relates to a method for manufacturing household thin paper.

  At present, household thin paper such as toilet cleaners and kitchen cleaners are generally made of a single sheet by plying multiple sheets of crepe paper to improve the texture, absorbency and bulkiness. Is used. And embossing is given in order to improve the surface strength and bulkiness of such household thin paper.

  For example, Patent Document 1 discloses a bulky paper in which embossing is performed in a state including moisture so that embossing is not easily generated even if the embossing is performed after the embossing is performed and the thickness is maintained.

  Further, for example, in Patent Document 2, a plurality of linear embosses are formed so as to form a lattice pattern, and a plurality of hexagonal embosses are formed so as to form a turtle shell pattern in each lattice portion surrounded by the lattice pattern. Accordingly, an industrial wipe is disclosed that is excellent in wiping and absorbing properties such as dust, high-viscosity grease, and low-viscosity water, and has a small amount of paper dust.

JP 2008-094067 A JP 2012-106123 A

  However, since the household thin papers described in Patent Documents 1 and 2 are folded after embossing, the positions of the embosses that overlap each other when they are folded are shifted so that they are sandwiched by a transport belt during transport in the subsequent process. There was a risk of the embossing being crushed. In addition, these household thin papers are shipped in a state of being stored in a storage plastic case or packaging film, and it takes a considerable amount of time to be used by consumers. It may be lowered. Furthermore, the embossing of these household thin papers has a weak restoring force, and there is a problem that when the household thin paper is pressed against an object to be cleaned during actual use, the crushed embossing is difficult to return to its original state.

  The subject of this invention is providing the manufacturing method of the household thin paper in which embossing is hard to be crushed even in the folded state.

In order to solve the above problem, the invention according to claim 1 is:
A method for producing household thin paper that is folded a plurality of times,
A first folding step of folding the household thin paper;
An embossing step of embossing the household thin paper folded by the first folding step;
A second folding step of folding the household thin paper embossed by the embossing step;
It is characterized by having.

Invention of Claim 2 is the manufacturing method of the household thin paper of Claim 1,
The embossing process includes
An embossing pattern having a convex portion and a concave portion embossing alternately arranged in at least one of the longitudinal direction and the lateral direction of the household thin paper, and having an intermediate portion between the convex portion and the concave portion. Embossing is formed over the entire surface.

Invention of Claim 3 is the manufacturing method of the household thin paper of Claim 1 or 2,
The emboss pattern is arranged in the vertical direction and the horizontal direction of the household thin paper.

Invention of Claim 4 in the manufacturing method of the household thin paper as described in any one of Claim 1 to 3,
The embossing has a short shape in the direction of the paper perforations.

Invention of Claim 5 in the manufacturing method of the household thin paper as described in any one of Claim 1 to 4,
The emboss has an elliptical shape that is short in the direction of the paper perforations and has a constricted portion on the long side.

Invention of Claim 6 is a manufacturing method of the household thin paper as described in any one of Claim 1 to 5,
The household thin paper is substantially water-decomposable containing pulp and a water-soluble binder, and is a water-decomposable sheet having a basis weight of 30 to 150 gsm.

The invention according to claim 7 is the method for producing the household thin paper according to claim 6,
A papermaking process of making a plurality of base papers by drying wet paper made from pulp;
A ply processing step of plying the plurality of base papers;
A solution application step of applying a binder solution containing the water-soluble binder to the base paper plyed in the ply processing step,
In the first folding step, the base paper to which the binder solution has been applied in the solution application step is folded.

  According to the present invention, embossing is performed in the middle of a plurality of times of folding, so that it is possible to reduce misalignment of embossing accompanying folding, and it is possible to provide household thin paper that is protected from embossing and is not easily crushed.

It is a top view which shows an example of the household thin paper of embodiment. It is an AA partial enlarged view of FIG. (A) is an end view of a BB cut portion in FIG. 2, and (b) and (c) are cross-sectional views showing an example in which a household thin paper is folded using a horizontal straight line in the X direction. It is a flowchart which shows the manufacturing method of the household thin paper which concerns on this embodiment. It is a schematic diagram which shows an example of the manufacturing equipment (solution provision equipment) of the household thin paper which concerns on this embodiment. It is a schematic diagram which shows an example of the manufacturing equipment (processing equipment) of the household thin paper which concerns on this embodiment. It is the schematic which shows an example of a papermaking apparatus. It is sectional drawing which shows an example of the household thin paper laminated body which concerns on this embodiment.

  Hereinafter, a household thin paper according to 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.

  In addition, in the household thin paper which is this invention, the household thin paper demonstrates the toilet cleaner 100 which is a water-decomposable sheet as an example. Further, the description will be made assuming that the vertical direction of the toilet cleaner 100 is the X direction and the horizontal direction of the toilet cleaner 100 is the Y direction.

In addition, the Y direction of the toilet cleaner 100 is the paper advance direction (machine direction) on the paper machine (machine direction), and the X direction of the toilet cleaner 100 is the width of the paper machine (machine direction). A direction perpendicular to the flow direction (cross machine direction (CD direction)).

(Embodiment)
The toilet cleaner 100 manufactured according to the present embodiment is obtained by plying (stacking) a plurality of base papers, and a predetermined chemical solution is applied thereto. Further, as shown in FIG. 1, the entire surface of the toilet cleaner 100 is processed with an emboss EM 11 in an elliptical shape that is short in the direction of the paper perforations.
Further, the embossed EM11 having a convex portion and the embossing EM11 having a concave portion are arranged alternately in the front side of the drawing in FIG.

  In addition, as shown in FIG. 2, the embosses processed on the entire surface of the toilet cleaner 100 are arranged such that convex embossed EM21 and concave embossed EM22 are alternately arranged, and the convex embossed EM21 and concave embossed EM22 An embossed pattern having an intermediate part MD21 is formed between them. Here, the embossed EM22 of the concave portion has a shape obtained by inverting the embossed EM21 of the convex portion. The intermediate part MD21 is a part where the embossed EM21 or the embossed EM22 is not formed. For this reason, the height of the intermediate part MD21 is lower than the embossed EM21 of the convex part and higher than the embossed EM22 of the concave part.

  Thus, the embossing EM21 of the convex part and the embossing EM22 of the concave part are alternately formed both in the vertical direction and in the horizontal direction, so that the convex part and the concave part are more dirty than the embossed pattern arranged in a line. The wiping property can be improved. The shapes of the embossed EM21 of the convex portion and the embossed EM22 of the concave portion are not particularly limited, and a circular shape, an elliptical shape, a polygonal shape, or the like is used. It is good also as what combined each shape.

  As shown in FIG. 2, the shapes of the embosses EM21 and EM22 include an oval shape that is short in the direction of the paper perforation and a shape having a constricted portion on the long side, that is, a so-called gourd-shaped emboss. preferable.

  In addition, the toilet cleaner 100 is folded into, for example, eight 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.

  Moreover, the toilet cleaner 100 of this embodiment is comprised from the water-decomposable fiber assembly so that it can be discarded as it is in the toilet bowl after cleaning the toilet.

  As the fiber assembly, natural fibers, synthetic fibers, fibers mixed with these, or the like can be used, and there is no particular limitation as long as the fiber assembly has water decomposability. Suitable raw material fibers include cellulose fibers such as wood pulp, non-wood pulp, rayon and cotton, and biodegradable fibers made of polylactic acid. Moreover, in order to improve the intensity | strength of a base material, you may mix | blend or apply and apply | coat polyvinyl alcohol (PVA), carboxymethylcellulose (CMC), etc. as a water-soluble binder.

  The toilet cleaner 100 of the present embodiment is coated with a predetermined chemical solution. Specifically, in addition to the aqueous cleaning agent, auxiliary agents such as a fragrance, an antiseptic, a disinfectant, and a paper strength enhancer are added. A predetermined chemical solution is applied.

  As the chemical solution, an appropriate one can be used. For example, as the aqueous cleaning agent, a surfactant or a lower or higher (aliphatic) alcohol can be used. 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 the disinfectant, alcohol, paraoxybenzoic acid ester, quaternary ammonium salt of monomer, cetylpyridinium chloride, phenoxyethanol, or the like can be used. As the paper strength enhancer, boric acid, various metal ions, and the like can be used.

  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.

  When such a toilet cleaner 100 is folded, it is not folded with the central portion in the vertical direction (X direction) of the toilet cleaner 100 as a crease. For example, the folding point PT31 (the intermediate MD21 of FIG. 3A) is used. When the toilet cleaner 100 is folded with a straight line parallel to the X direction connecting the hem portions of the embosses EM21 and EM22 of the toilet cleaner 100 as shown in FIG. 3 (b), as shown in FIG. The bulging portion PR31 of the embossing EM21 of the convex portion on the lower side (one side) enters the bulging portion PR32 of the embossing EM22 of the concave portion on the upper side (the other side).

  For this reason, even if the pressure is applied from the upper side (the other side) and the lower side (one side) of the toilet cleaner 100 by folding the toilet cleaner 100, the toilet cleaner 100 is on the lower side (one side). Since the bulging portion PR31 of the embossed EM21 of the convex portion enters the bulging portion PR32 of the embossed EM22 of the concave portion on the upper side (the other side), the bulky embossed EM21 and EM22 are protected and are not easily crushed. Become.

  On the other hand, for example, when the toilet cleaner 100 is folded using a straight line parallel to the X direction connecting the centers of the bulging portions PR31 of the embossed EM21 of the convex portion as shown in FIG. The apexes of the bulging portion PR31 of the embossed EM21 of the convex portion come into contact with each other.

  When pressure is applied from the upper side (the other side) and the lower side (the one side) of the toilet cleaner 100 in the state shown in FIG. There is a possibility that the pressure is concentrated on the PR 32 and the embossed EM 22 in the concave portion is crushed.

[Manufacturing method of toilet cleaner 100]
Next, a method for manufacturing the toilet cleaner 100 will be described.
FIG. 4 is a flowchart showing a method for manufacturing the toilet cleaner 100. FIG. 5 is a schematic diagram of a solution application facility that applies a binder solution to the base paper sheet of the toilet cleaner 100. FIG. 6 is a schematic diagram of a processing facility for processing the base paper sheet to which the binder solution is applied by the solution application facility shown in FIG.

  In the manufacturing method of the toilet cleaner 100, as shown in FIG. 4, first, a paper making process (S1) for making a paper as a base paper with a paper machine (not shown) is performed.

  Next, as shown in FIG. 4 and FIG. 5, in the solution application facility, continuous dry base paper 1 </ b> A fed out from a plurality of (for example, two) primary raw rolls 1, 1 each wound up a base paper that has been made, 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. 5 and 7, in the processing facility, the continuous water-degradable sheet 1 </ b> D fed from the secondary raw roll 11 wound in the slit / winding step (S <b> 5) is folded. The first folding step (S6), the embossing step (S7) for embossing the continuous water-decomposable sheet 1D folded in half in the first folding step (S6), and the embossing are performed. The second folding step (S8) for further folding the embossed sheet 1E, and the finishing process for finishing the embossed sheet 1E folded in eight in the second folding step (S8) The processing step (S9) is 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 contains 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 disintegration can be improved by a capillary phenomenon.
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 the binder solution is applied even in the papermaking process, the strength of the entire water-decomposable sheet can be increased, and by further applying the 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. 7 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 paper making machine) shown in FIG. 7 includes a former 21, a wire part, a first dry part 24, a spray part, and a second dry part 31.

  The former 21 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 releases and beats raw materials such as pulp fibers, and an addition device that adds additives such as a sizing agent, pigment, paper strength enhancer, bleaching agent, and flocculant to the released 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 24 dries the wet paper formed in the wire part. The spray part sprays the binder onto the paper dried by the first dry part 24. The 2nd dry part 31 dries the paper which has been sprayed with the binder and is wet.

  The furnish supplied from the former 21 is made in the wire part, and wet paper is formed on the wire 22. Water is removed from the wet paper by suction by a suction box 23 installed in the wire part, and a predetermined moisture content is obtained. Next, the wet paper is introduced into the first dry part 24 and dried. The first dry part 24 is composed of a through air dryer (hereinafter referred to as TAD). The TAD includes a rotating drum 25 having a breathable peripheral surface, and a hood 26 that covers the rotating drum 25 almost airtightly. In TAD, air heated to a predetermined temperature is supplied into the hood 26. The heated air flows from the outside of the rotary drum 25 toward the inside. The wet paper web is transported while being held on the peripheral surface of the rotating drum 25 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 24 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 24 and 31. Both dry parts 24 and 31 are connected via a conveyor.

  The conveyor includes an upper conveyor belt 27 and a lower conveyor belt 28 that rotate in the directions indicated by the arrows. The conveyor 27 is configured to transport paper to the second dry part 31 while being dried by the TAD of the first dry part 24 and sandwiching the paper between the belts 27 and 28. A vacuum roll 29 is disposed at the folded end on the downstream side of the upper conveyor belt 27. The vacuum roll 29 adsorbs paper on the back surface of the upper conveyor belt 27 and conveys the upper conveyor belt 27 under the adsorbed state.

  As shown in FIG. 7, the spray part includes a spray nozzle 30. The spray nozzle 30 is disposed below the second dry part 31 and opposed to the vacuum roll 29. The spray nozzle 30 sprays a spray liquid containing a binder toward the vacuum roll 29, 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 31. The second dryer part 31 is composed of a Yankee dryer. The paper which 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 32 of the Yankee dryer installed in the hood 33. The paper is dried while being conveyed while being held by the rotating drum 32.

  In addition, the position where the binder is supplied in the spray part may be a position between the first and second dry parts 24 and 31, for example, above the upper conveyor belt 27 (the first and second dry parts shown in FIG. 7). You may make it spray a binder from the arrow position between 24 and 31). Further, the binder may be sprayed from above (the arrow position on the right side of the second dry part 31 shown in FIG. 7) on the paper after being dried by the second dry part 31. In addition, the direction in which the binder is sprayed between the first and second dry parts 24 and 31 and after the second dry part 31 is not limited to the upper side, 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 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 100 is processed through the first folding step (S6), the embossing step (S7), the second folding step (S8), and the finishing step (S9).

[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. 5, 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 that has been plyed. In addition, when the continuous dry base papers 1A and 1A are overlapped with each other, the continuous dry base papers 1A and 1A may be lightly fastened with pin embossing (contact embossing) so that the continuous dry base papers 1A and 1A 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 carboxymethylcellulose in the binder solution is 1 to 30% by weight, preferably 1% by weight or more and less than 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 constituting the sheet while remaining unswelled by crosslinking of specific metal ions in the chemical solution, 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 a point at which 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. 5, 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 the spray nozzles 3 and 3 of the system or the one-fluid system to generate a continuous sheet 1C.
The ply continuous sheet 1B immediately after the ply processing in the ply processing step is merely overlapped with the continuous dry base papers 1A and 1A. Therefore, in the solution applying step, the binder solution is sprayed from both sides of the ply continuous sheet 1B. , 3 is substantially the same as the case where the binder solution is applied in a state where the continuous dry base papers 1A and 1A are separated, the binder solution penetrates in the thickness direction, and the sheets adhere to each other during conveyance. It penetrates further during pressure bonding in the slit and winding process.
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.
When a two-fluid spray nozzle is used in the present embodiment, a binder solution (viscosity 400 to 1200 MPa.s) is applied to each outer surface of the ply-processed ply continuous sheet 1B with a high pressure (injection pressure of 1.5 MPa or more). Since it is applied, it is easy to impregnate the binder solution in the thickness direction of the sheet.
On the other hand, when a one-fluid spray nozzle is used in the present embodiment, a binder solution (viscosity 400 to 1200 MPa.s) is applied to the outer surface of each ply-processed ply continuous sheet 1B at an injection pressure of 1.5 MPa or less. Thus, the binder solution is easily impregnated in the thickness direction of the sheet, and the binder solution is easily applied uniformly on the sheet surface.
In this way, by spraying the binder solution onto the outer surface of the ply continuous sheet 1B, the toilet cleaner 100 is centered in the thickness direction (when applied on both sides) or non-coated with the binder solution (when applied on one side). Since the content of the water-soluble binder increases as it goes from the surface to the application surface of the binder solution, the surface strength can be improved while ensuring water disintegration, and the toilet cleaner 100 is less likely to be damaged even when rubbed strongly. Can be manufactured.

[Drying process]
Next, the drying step (S4) of this embodiment will be described. In the drying step (S4), as shown in FIG. 5, in the drying equipment 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, the amount of penetration of the binder solution decreases from the outer surface of the continuous sheet 1C toward the inner side in the thickness direction, and thus the fixing amount of CMC decreases toward the inner side in the thickness direction. Therefore, when the chemical solution is impregnated in the finishing step (S7) to be 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 100 obtained can be made hard to dry.
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. Water is heated by infrared rays and dried.
Therefore, compared with a dryer using hot air, uniform drying is possible, and generation of wrinkles in the subsequent slit and winding process can be prevented.

[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.

[First folding step]
Next, the first folding step (S6) of this embodiment will be described. In the first folding step (S6), as shown in FIG. 6, the continuous water-decomposable sheet 1D fed from the secondary raw roll 11 is subjected to folding processing by the folding processing machine 12, The continuous water-decomposable sheet 1D is folded in half at the center in the MD direction.

[Embossing process]
Next, the embossing process (S7) of this embodiment will be described. In the embossing step (S7), as shown in FIG. 6, the embossing roll 13 is used to form a predetermined shape on the entire surface of the continuous water-decomposable sheet 1D folded in the first folding step (S6). Embossing is applied. This embossing is performed for the purpose of improving the design, as well as improving the strength, bulkiness, and wiping properties of the sheet.

[Second folding step]
Next, the second folding step (S8) of this embodiment will be described. In the second folding step (S8), as shown in FIG. 6, the embossed sheet 1E embossed in the embossing step (S7) is subjected to folding processing by the folding processing machine 14. As a result, the embossed sheet 1E is folded in two in the CD direction, and further folded in two in the CD direction. That is, the sheet is folded in eight in the first folding step (S6) and the second folding step (S8).
In the second folding step (S8), folding is performed so that the embossed EM21 of the convex portion on one side enters the embossed EM22 of the concave portion.

[Finishing process]
Next, the finishing process (S9) of this embodiment will be described. In the finishing step (S9), as shown in FIG. 6, in the finishing processing facility 15, the embossed sheet 1E is cut, the cut sheet is impregnated with the chemical solution, and the sheet is impregnated with the chemical solution. Packaging is performed in a series of flows. Here, when CMC is used as the water-soluble binder, the cross-linking agent contained in the chemical solution is preferably a polyvalent metal ion. 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.
The toilet cleaner 100 is manufactured through the above steps.

  Next, the toilet cleaner manufactured according to the embodiment of the present embodiment, that is, a toilet cleaner (Example) manufactured by embossing a sheet folded in two (continuous water-decomposable sheet 1D), The result of evaluating the crushing resistance of the embossing of the toilet cleaner (Comparative Examples 1 and 2) manufactured after the embossing without folding before embossing, and the sheet after folding The results of evaluating the ease of peeling will be described with reference to Tables 1 and 2.

<Conditions for implementation>
Example Material of base paper: 100% pulp
Pulp blending; NBKP: LBKP = 40: 60
Weighing after ply: 90 g / m ² (45 g / m ² per sheet before ply)
Number of plies; 2 plies
Water-soluble binder and the content thereof; CMC per side 0.6 g / ^{m 2,} in both 1.2 g / ^{m 2} (spray application)
Chemical liquid components: surfactant, glycol ether, disinfectant, fragrance, water, etc.
Chemical solution impregnation rate: 200%
Folding before embossing; Yes
Misalignment of embossing overlapped by folding; Uncompared Example 1 Base paper material; Pulp 100%
Pulp blending; NBKP: LBKP = 40: 60
Weighing after ply: 90 g / m ² (45 g / m ² per sheet before ply)
Number of plies: 2
Water-soluble binder and the content thereof: CMC per side 0.6 g / ^{m 2,} in both 1.2 g / ^{m 2} (spray application)
Chemical liquid components: surfactant, glycol ether, disinfectant, fragrance, water, etc.
Chemical solution impregnation rate: 200%
Folding before embossing; None
Displacement of embossing overlapped by folding; Comparative Example 2 Base paper material; Pulp 100%
Pulp blending; NBKP: LBKP = 40: 60
Weighing after ply: 90 g / m ² (45 g / m ² per sheet before ply)
Number of plies: 2
Water-soluble binder and the content thereof: CMC per side 0.6 g / ^{m 2,} in both 1.2 g / ^{m 2} (spray application)
Chemical liquid components: surfactant, glycol ether, disinfectant, fragrance, water, etc.
Chemical solution impregnation rate: 200%
Folding before embossing; None
Misalignment of embossing overlapped by folding process: None

<Evaluation method of crushing difficulty of emboss>
Two toilet cleaners of the above-mentioned Examples and Comparative Examples 1 and 2 are stacked, and a plastic cylinder having a diameter of 25 mm (with a weight of 38 g), 0.893 kg, 1.481 kg, 2.951 kg, and 4. After placing 96 kg and 9.958 kg weights for 5 minutes, the degree of crushing of the emboss was evaluated immediately after removing the cylinder and weight and 15 minutes thereafter. Specifically, after the emboss is crushed, it is “○” when it is restored to the original state, “△” when the emboss is crushed and then restored a little, and “×” when the emboss is crushed and not restored ".
In addition, the weight of the weight was set to 0.893 kg in order to set the load per unit area to 0.19 kg / cm ² (a load assuming that the emboss is crushed on the conveyor belt). Moreover, the weight of the weight is set to 1.481 kg in order to set the load per unit area to 0.31 kg / cm ² (load assuming the crushing of the emboss at the time of packaging). Moreover, the weight of the weight is set to 2.951 kg in order to set the load per unit area to 0.61 kg / cm ² (a load assuming that the emboss is crushed during actual use). The weight is 4.96 kg because the load per unit area is 1.02 kg / cm ² . The weight of the weight is set to 9.958 kg because the load per unit area is set to 2.04 kg / cm ² .

<Evaluation method of ease of peeling of sheet after folding>
About each toilet cleaner of the above-mentioned Example and Comparative Examples 1 and 2, the sheet in a state of being folded in two at the center in the MD direction is cut with a roll cutter to a width of 25 mm, a test piece is created, and a tensile test The 180 ° peel strength of the test piece was measured with a machine.
In this measurement, the moving speed of the chuck is 500 mm / min, and the measured first maximum point load is the peel strength.

As evaluation results shown in Table 1, in the embodiment, 0.19 kg ^/ cm ² load per unit ^{area, 0.31kg / cm 2, 0.61kg /} cm 2, 1.02kg / cm 2, 2.04kg In any case of / cm ² , the evaluation result was “◯”. In other words, it was found that the embossing was crushed and restored to the original state during conveyance with the conveyance belt, during packaging, and during actual use.
On the other hand, in Comparative Example 1, when the load per unit area is 0.19 kg / cm ² , the evaluation result is “Δ”, and the load per unit area is 0.31 kg / cm ² and 0.61 kg / cm 2. ^{2, 1.02kg /} cm ^2, if you have a 2.04kg / cm ^2, the evaluation result was "×". In other words, it was found that the emboss was crushed and then restored a little when being conveyed by the conveyor belt, but it was not restored after the emboss was crushed during packaging and actual use.
In Comparative Example 2, 0.19 kg ^/ cm ² load per unit area, 0.31 kg / cm 2, when a 0.61 kg / cm ^2, the evaluation result is "○", per unit area When the load was 1.02 kg / cm ² , the evaluation result was “Δ”, and when the load per unit area was 2.04 kg / cm ² , the evaluation result was “x”. In other words, it was found that the embossing was crushed and then restored to its original state during conveyance with the conveyance belt or during packaging. In addition, even during actual use, if the force when pressing the toilet cleaner against the object to be cleaned is weak (for example, load per unit area; 0.61 kg / cm ² ), after the emboss is crushed, the original When the force is increased (for example, load per unit area; 1.02 kg / cm ² ), it becomes difficult to recover after the emboss is crushed, and when the force is further increased (for example, the unit area) Per load; 2.04 kg / cm ² ), it was found that after the embossing was crushed, it could not be restored.

  As shown in the evaluation results shown in Table 2, it was found that the peel strength values were comparable in both cases of Examples and Comparative Examples 1 and 2. In other words, it was found that whether the toilet cleaner is unfolded from the folded state does not affect the ease of removing the toilet cleaner, whether or not it is folded before embossing. .

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.
In the description of the embodiment of the present invention, the convex emboss EM21 and the concave emboss EM22 are alternately arranged in at least one of the vertical direction and the horizontal direction, and the convex emboss EM21 and the concave emboss EM22 are arranged. The embossed pattern having the intermediate portion MD21 is illustrated as an example, but the embossed pattern is not necessarily limited to this shape, and may be a multistage structure having three or more stages. The embossed shape may be any shape such as a square or a polygon.

  Moreover, it is preferable that height HT31 and HT32 from embossing EM21 of a convex part to embossing EM22 of a recessed part in FIG.3 (b) are 0.4 mm-5.0 mm, for example.

In the description of the embodiments of the present invention, a single household thin paper sheet that is folded a predetermined number of times is illustrated, but a household paper sheet in which a plurality of rectangular thin paper sheets folded a predetermined number of times are laminated It may be a thin paper laminate.
For example, as shown in FIG. 8, the household thin paper laminate LY81 is configured by laminating a plurality of single household thin paper folded three times (once in the MD direction and twice in the CD direction). .

In the description of the embodiment of the present invention, the binder solution is applied by a spray method. However, the doctor chamber method (for the continuous dry base paper 1A continuously fed from the primary original roll 1 ( Transfer equipment comprising two printing plate rolls paired with one backup roll, an anilox roll paired with each printing plate roll, and a doctor chamber for applying a chemical to each anilox roll), or / And a three-roll system (two printing plate rolls paired with one backup roll, an anilox roll paired with each printing plate roll, a dip roll for applying a chemical to each anilox roll, You may make it apply | coat a binder solution with the transfer equipment provided with the bread | pan which provides a chemical | medical solution to a dip roll. That is, in the method for producing a water-decomposable sheet obtained by plying a plurality of base papers (continuous dry base paper 1A), out of a plurality of base papers that do not contain a water-soluble binder, A solution application step of applying (transferring) a binder solution to at least one of the surfaces; a ply processing step of plying the plurality of base papers; a drying step of drying the ply-processed sheet; and the drying step A winding step of slitting and winding the sheet dried in a predetermined width, and the solution applying step corresponds to at least one of the surfaces of the base paper as the front surface and the back surface of the water-decomposable sheet The binder solution is transferred from the provided printing machine to the corresponding base paper.
In the solution application step, among the plurality of base papers that do not contain a water-soluble binder, the binder solution is applied to at least one surface of the base paper that becomes the front and back surfaces of the water-decomposable sheet, and water-soluble You may make it provide a binder solution with respect to at least any one side of the base paper used as the surface of a water-decomposable sheet and a back surface among several base paper containing a binder.

In mere roll transfer, in order to apply a desired amount of chemical solution, a very high concentration chemical solution is required, and such a chemical solution has a high viscosity and cannot be uniformly transferred by roll transfer. Further, if the concentration is lowered in order to lower the viscosity, the desired applied amount cannot be obtained as described above. Thus, since it is extremely difficult to apply a chemical to the dried base paper, a doctor chamber method and / or a three-roll method is adopted.
By adopting a doctor chamber method or / and a three-roll method in which a pair of printing plate rolls is provided for one backup roll, a sufficient amount of chemical solution is applied to each printing plate roll at least in the total amount. Can be applied to the dried base paper. Further, since there is only one backup roll, it can be applied extremely uniformly. This is because the tension between the first printing roll and the next printing roll is extremely stable and constant because there is only one backup roll. However, the chemical solution can be applied to the continuous base paper very uniformly. In addition, since the interval between the two printing plate rolls is shortened, even after the chemical solution is applied on the first printing plate roll and then applied on the next printing plate roll, uniform transfer can be performed without uneven application. It is. Such an effect cannot be obtained simply by making the backup roll and the plate roll into a pair of two stages.

More preferably, the chemical solution is applied by the doctor chamber method because the chemical solution can be transferred more uniformly and stably in the width direction than the three-roll method.
Furthermore, it has a drying process which dries the continuous paper to which the chemical | medical solution was provided. This drying process is preferably indirect drying without direct contact with the continuous paper, particularly by infrared irradiation. In the case of indirect drying, generation of wrinkles is suppressed. In particular, if it is caused by infrared irradiation, drying of the various portions of the paper surface occurs uniformly, so that generation of wrinkles and distortion during drying can be effectively prevented.
The doctor chamber method will be described in detail below as an example.

In this doctor chamber type transfer equipment, one plate roll is provided for one backup roll.
The coating processing speed when applying the binder solution is 30 to 100 m / min, and more preferably 50 to 80 m / min. If it is less than 30 m / min, the crepe stretches before being dried, and there is a problem that it is difficult to process in a subsequent process. On the other hand, when the amount exceeds 100 m / min, a sufficient transfer amount cannot be obtained, or variation in wet strength and water disintegration occurs due to variation in the coating amount in the width direction.

  The diameter of the backup roll is suitably 250 to 420 mm. When the diameter is less than 250 mm, the contact area between the printing plate roll and the backup roll is reduced, and stable coating cannot be performed. Even if the diameter exceeds 420 mm, there is no problem in manufacturing, but it is not preferable because the equipment cost is excessive.

  The printing plate roll is provided with an anilox roll for delivering a binder solution thereto, and a doctor chamber for delivering the binder solution to the anilox roll for application thereto is provided. For the doctor chamber, a snake pump that delivers the binder solution to the doctor chamber is installed on both the feed and return to feed the anilox roll solution pan. High binder solution transfer is possible.

The continuous dry base paper 1A fed out from the primary raw roll 1 is wound around a backup roll through an appropriate guide roll, and given appropriate tension and surface stability.
Then, the binder solution is roll-transferred by the printing plate roll to the continuous dry base paper 1A wound around the backup roll.
Here, the printing plate roll is a solid roll with no concave grooves, and a binder solution is applied to the entire continuous dry base paper 1A as in solid printing. The seamless roll used as the printing plate roll is formed by winding a rubber plate around a sleeve of a type roll, putting it in a kettle, performing overheating welding, and polishing. The rubber plate used as the material can be selected in material, hardness, color and the like according to a predetermined purpose.

On the other hand, the number of lines and the cell capacity of the anilox roll delivering the binder solution to the printing plate roll are 60 to 120 lines / inch and the cell capacity is 40 to 90 ml / m ² depending on the concentration of the binder solution. Is desirable. If the number of lines is less than 60 lines / inch, an excessive binder solution is transferred to the printing plate roll, and as a result, the binder solution may be applied to the continuous dry base paper 1A with unevenness from the printing plate roll. Rise. On the other hand, when the number of lines exceeds 120 lines / inch, it becomes difficult to deliver a sufficient amount of the binder solution to the entire peripheral surface of the printing plate roll. Further, if the cell capacity is less than 40 ml / m ² , it becomes difficult to deliver a sufficient amount of the binder solution to the printing plate roll, and even if the cell capacity exceeds 90 ml / m ² , only the yield is deteriorated. .
Note that the continuous dry base paper 1A to which the binder solution is applied (transferred) as described above targets only the base paper that is the uppermost layer or the lowermost layer when plying. That is, for example, in the case of three-ply processing, the binder solution is not applied (transferred) to the continuous dry base paper 1A serving as the middle layer.

In the doctor chamber method, the binder solution is transferred to the continuous dry base paper 1A, that is, the binder solution is transferred to the continuous dry base paper 1A before the ply processing step. Thereafter, the binder solution may be transferred to the ply continuous ply sheet 1B.
That is, in a method for producing a water-degradable sheet obtained by plying a plurality of base papers (continuous dry base paper 1A), a ply processing step of plying a plurality of base papers not containing a water-soluble binder, and a ply-processed sheet A solution applying step for applying (transferring) the binder solution to the substrate, a drying step for drying the sheet provided with the binder solution, and a winding step for slitting and winding the sheet dried in the drying step to a predetermined width. And the solution applying step transfers the binder solution to a corresponding outer surface from a printing machine provided corresponding to the outer surface of at least one of the plyed sheets.
In the ply processing step, a plurality of base papers containing no water-soluble binder may be ply-processed, and a plurality of base papers containing a water-soluble binder may be ply-processed.
Thus, when transferring a binder solution by a doctor chamber system, since a binder solution with high viscosity can be apply | coated, it can suppress that a binder solution osmose | permeates the inside of a sheet | seat. Therefore, CMC can be fixed only on the sheet surface. In addition to the case of transferring the binder solution by the doctor chamber method, for example, the binder surface may be coated on the sheet surface by a coater for hot melt resin coating. In such a case, it is possible to fix the CMC only on the sheet surface.

In the description of the embodiment of the present invention, the binder solution is applied in the solution application process of the solution application equipment shown in FIG. 5, but the binder solution may be applied in the papermaking process. Good.
That is, in the method for producing a water-decomposable sheet obtained by plying a plurality of base papers (continuous dry base paper 1A), the paper making process includes making a plurality of base papers, and the paper making process is performed on wet paper being made. To apply a binder solution.

Specifically, in the paper making process, for example, wet paper formed by a paper making net is transported on a felt, and the wet paper on the felt is transferred to a Yankee dryer via a touch roll. The wet paper is dried to obtain a base paper in the process of being attached and conveyed, and the binder solution is sprayed from the spray nozzle onto the wet paper immediately after being transferred onto the above-mentioned Yankee dryer.
Thus, when the binder solution is applied even in the paper making process, the strength of the entire water-decomposable sheet obtained can be increased, and the surface of the water-decomposable sheet can be obtained by further applying the binder solution in the subsequent solution applying process. The strength can be further increased.

  In describing the embodiments of the present invention, CMC is used as the water-soluble binder, but polyvinyl alcohol (PVA) may be used.

  In addition, the detailed configuration of the toilet cleaner 100 can be changed as appropriate without departing from the spirit of the present invention.

100 Household thin paper (toilet cleaner)
DESCRIPTION OF SYMBOLS 1 Primary raw fabric roll 1A Continuous dry base paper 1B Ply continuous sheet 1C Continuous sheet 1D Continuous water-decomposable sheet 1E Embossed sheet 2 Laminating part 3 Spray nozzle 4 First drying equipment 5 Slitter 6 Winder equipment 11 Secondary raw roll 12 Folding machine 13 Embossing roll 14 Folding machine 15 Finishing processing equipment 21 Former 22 Wire 23 Suction box 24 First dry part 25 Rotating drum 26 Hood 27 Upper conveyor belt 28 Lower conveyor belt 29 Vacuum roll 30 Spray nozzle 31 Second dry part 32 Rotating drum 33 Hood EM21, EM22 Embossed MD21 Intermediate part PR31, PR32 Swelling part LY81 Household thin paper laminate

Claims (7)

A method for producing household thin paper that is folded a plurality of times,
A first folding step of folding the household thin paper;
An embossing step of embossing the household thin paper folded by the first folding step;
A second folding step of folding the household thin paper embossed by the embossing step;
A method for producing household thin paper, comprising: The embossing process includes
The embossed pattern having an intermediate portion between the embossment of the convex portion and the embossment of the concave portion is alternately arranged in at least one of the longitudinal direction and the horizontal direction of the household thin paper. 2. The method for producing household thin paper according to claim 1, wherein the emboss is formed over the entire surface.   3. The method for manufacturing household thin paper according to claim 1, wherein the emboss pattern is arranged in a vertical direction and a horizontal direction of the household thin paper.   The method for producing household thin paper according to any one of claims 1 to 3, wherein the embossing has a shape that is short in the direction of the paper perforations.   The method for producing household thin paper according to any one of claims 1 to 4, wherein the embossing has an elliptical shape that is short in the direction of the paper perforations and has a constricted portion on the long side.   The said household thin paper is a water-degradable sheet | seat of 30-150 gsm which is substantially hydrolysable containing a pulp and a water-soluble binder, The fabric weight is any one of Claim 1 to 5 characterized by the above-mentioned. The manufacturing method of household thin paper as described. A papermaking process of making a plurality of base papers by drying wet paper made from pulp;
A ply processing step of plying the plurality of base papers;
A solution application step of applying a binder solution containing the water-soluble binder to the base paper plyed in the ply processing step,
The method for producing household thin paper according to claim 6, wherein the first folding step folds the base paper to which the binder solution has been applied in the solution application step.

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