Household tissue paper manufacturing method and household tissue paper manufacturing system

Abstract

To provide thin paper for household having unevenness in which both a property of the unevenness being hard to collapse in a folded state and easiness of expanding of a fold are easy to be improved.SOLUTION: A production method of thin paper for household includes: a first folding step (step S2) of folding a raw paper sheet G such that end portions are shifted from each other; and an emboss processing step (step S3) of forming unevenness in the raw paper sheet G1 folded in the first folding step (step S2). It is preferable that the production method includes a second folding step (step S5) of further folding the raw paper sheet G2 having unevenness formed in the emboss processing step (step S3).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method and system for producing tissue paper for home use. [Background technology]

[0002] In recent years, in order to improve the surface strength and bulkiness of household tissue paper such as toilet cleaners and kitchen cleaners, unevenness is often formed by embossing. Since household tissue paper is often provided to users in a folded state, it is preferable for household tissue paper with unevenness formed by embossing to be folded so that, when folded, the convex portion on one side of the fold overlaps the concave portion on the other side of the fold, and the convex portion on one side of the fold enters the concave portion on the other side of the fold, in order to prevent the unevenness from being crushed when folded.

[0003] Therefore, in order to produce household tissue paper folded in this manner, a method is known for manufacturing household tissue paper in which the paper is embossed so that convex and concave portions are arranged alternately, and then the position of the fold is adjusted and the paper is folded so that the convex portion on one side of the fold overlaps the concave portion on the other side of the fold (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-13484 Summary of the Invention [Problem to be solved by the invention]

[0005] When household tissue paper is folded, the user may use it either while it is folded or after unfolding it, and if the folded household tissue paper is tightly packed together, it may be difficult to unfold it.

[0006] In this regard, in order to make folded household tissue paper easier to unfold, it is possible to fold it so that the edges do not overlap exactly, but are offset by a specified width.However, as in Patent Document 1, when embossing is performed so that convex and concave portions are arranged alternately, and then the position of the fold is adjusted so that the convex portion on one side of the fold overlaps the concave portion on the other side of the fold, the position of the fold is determined by the position of the embossed convex and concave portions, making it difficult to stably adjust the offset width of the edges to an appropriate range.

[0007] The object of the present invention is to facilitate improving both the resistance of the unevenness to crushing when folded and the ease with which the folds can be unfolded for household tissue paper having unevenness formed thereon. [Means for solving the problem]

[0008] In order to solve the above problem, the invention described in claim 1 is a method for manufacturing tissue paper for home use, The edges of the base paper sheet are shifted. At the first fold a first folding step of folding; a concave-convex forming step of forming concave-convex on the base-paper sheet folded in the first folding step; a cutting step of cutting the base-paper sheet on which the concave-convex portions have been formed in the concave-convex portion forming step; a second folding step of further folding the base-paper sheet after cutting in the cutting step; Including fruit, In the second folding step, the concaves and convexes formed on one side of the first fold in the base-paper sheet and the concaves and convexes formed on the other side of the first fold in the base-paper sheet are combined, and the base-paper sheet is folded in a state in which the convex portions on one side of the first fold in the base-paper sheet are inserted into the concave portions on the other side. It is characterized by:

[0011] Claim 2 The invention described in claim 1 In the method for manufacturing household tissue paper described in The base paper sheet after cutting in the cutting step is in a rectangular shape with all folds unfolded, and in the first folding step, the folds are parallel to one of the sides of the base paper sheet in this state. The aforementioned The base paper sheet is folded at a first fold.

[0012] Claim 3 The invention described in claim 2In the method for manufacturing household tissue paper described in The first fold is a fold that is parallel to the long side of the base-paper sheet in the above state.

[0013] Claim 4 The invention described in claim 2 In the method for manufacturing household tissue paper described in The first fold is characterized in that it is shifted by 0.5 mm to 5.0 mm from the center of the base-paper sheet in the direction perpendicular to the first fold in the state.

[0014] Claim 5 The invention described in claim 4 In the method for manufacturing household tissue paper described in The first fold is offset by 1.5 mm to 3.5 mm from the center of the base-paper sheet in the direction perpendicular to the first fold in the state.

[0015] Claim 6 The invention described in is a home tissue paper manufacturing system, The edges of the base paper sheet are shifted. At the first fold Fold No. 1 a folding means; The aforementioned No. 1 a concave-convex forming means for forming concave-convex shapes on the base paper sheet folded by the folding means; cutting means for cutting the base paper sheet on which the concave-convex portions have been formed by the concave-convex forming means; a second folding means for further folding the base-paper sheet after being cut by the cutting means; Equipped with 、 The second folding means is configured to fold the base paper sheet in a state where the concave and convex portions formed on one side of the first fold in the base paper sheet and the concave and convex portions formed on the other side of the first fold in the base paper sheet are combined, and the convex portion on one side of the first fold in the base paper sheet is inserted into the concave portion on the other side. It is characterized by: [Effects of the Invention]

[0016] According to the present invention, it is possible to easily improve both the resistance of the unevenness to crushing when folded and the ease with which the folds can be unfolded for household tissue paper having unevenness formed thereon. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a flowchart showing a method for manufacturing a toilet cleaner according to an embodiment. [Figure 2] 1 is a schematic diagram showing a toilet cleaner manufacturing system according to an embodiment, in which the thickness of a base paper sheet is exaggerated compared to the actual thickness. [Figure 3] 10A and 10B are diagrams showing the folding method in the first folding process of step S2 in the manufacturing method of the toilet cleaner according to the embodiment, where (a) shows the state before folding and (b) shows the state after folding at the first fold. [Figure 4] FIG. 2 is an enlarged plan view of a portion of the base-paper sheet after the embossing process in step S3 in the manufacturing method of the toilet cleaner according to the embodiment. [Figure 5] 1 is a cross-sectional view of a section perpendicular to the first fold after the embossing process in step S3 in the manufacturing method of the toilet cleaner according to the embodiment. Note that the number of formed projections and recesses is reduced compared to the actual number, and the illustration is simplified. [Figure 6] 10A and 10B are diagrams showing the folding method in the second folding process of step S5 in the manufacturing method of the toilet cleaner according to the embodiment, where (a) shows the state before folding, (b) shows the state after folding at the second fold, and (c) shows the state after folding at the third fold. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, embodiments of the present invention will be described with reference to Figures 1 to 6. However, the technical scope of the present invention is not limited to the illustrated examples. In the following, as an example of household tissue paper, a toilet cleaner, which is a wet sheet used to clean toilets, will be described. In the description of the present embodiment, a numerical range stated using "from" includes the numerical values ​​stated before and after it as the lower limit and upper limit. 2, the devices constituting the toilet cleaner manufacturing system 100 are arranged in a straight line, and the explanation will be given by defining the X direction as the direction in which the base paper sheet G is unwound from the base paper roll 110, the Y direction as the width direction of the base paper sheet G perpendicular to the X direction, and the Z direction as the thickness direction of the base paper sheet G. In this case, the X direction is along the machine direction in which the paper travels in the paper machine when the base paper sheet G is manufactured, and the Y direction is along the cross machine direction in which the paper travels perpendicular to the cross machine direction in which the paper travels in the paper machine when the base paper sheet G is manufactured.

[0019] [1. Manufacturing method] The manufacturing method for manufacturing a toilet cleaner using the toilet cleaner manufacturing system 100 according to the embodiment includes a base paper feeding process (step S1), a first folding process (step S2), an embossing process (step S3), a cutting process (step S4), a second folding process (step S5), a chemical solution impregnation process (step S6), a stacking process (step S7), and a packaging process (step S8), as shown in FIG. The toilet cleaner manufacturing system 100 is a complete manufacturing line for manufacturing toilet cleaners.

[0020] [(1) Step S1: Base Paper Feeding Process] When a toilet cleaner is manufactured using the toilet cleaner manufacturing system 100, first, a base paper sheet G is unwound from a base roll 110 provided in the toilet cleaner manufacturing system 100.

[0021] The raw paper roll 110 is configured so that a long raw paper sheet G can be wound up and continuously fed out.

[0022] The base paper sheet G is made by processing a thin paper formed by making a fiber aggregate whose main raw material is a known pulp fiber or the like.

[0023] The base paper sheet G may be a sheet made of a plurality of sheets ply processed or a single sheet, but the weight of the base paper sheet G is preferably 30 g / m 2 from 150 g / m 2 The basis weight is based on JIS P8124.

[0024] The raw material fibers of the fiber assembly may be natural or synthetic fibers, or a mixture of these. Suitable raw material fibers include cellulosic fibers such as wood pulp, non-wood pulp, rayon, and cotton, and biodegradable fibers made of polylactic acid. These fibers may also be used in combination with polyethylene fibers, polypropylene fibers, polyvinyl alcohol fibers, polyester fibers, polyacrylonitrile fibers, synthetic pulp, glass wool, and the like.

[0025] The fiber aggregate preferably contains at least pulp, and the raw pulp is preferably a blend of bleached hardwood kraft pulp (LBKP) and bleached softwood kraft pulp (NBKP) in an appropriate ratio, with the blend ratio of bleached softwood kraft pulp preferably being 50 to 70% by mass.

[0026] A water-soluble binder is also added to the base-paper sheet G. As the water-soluble binder, for example, a water-soluble polymer having a carboxyl group, such as carboxymethyl cellulose (hereinafter referred to as CMC), can be used. When CMC is used as the water-soluble binder, the amount added is preferably 0.5 to 1.0% by mass relative to the mass of the base-paper sheet G.

[0027] [(2) Step S2: First folding process] Next, the base paper sheet G unwound from the base roll 110 in step S1 is folded in half by the first folding device 120 provided in the toilet cleaner manufacturing system 100.

[0028] 3, the first folding device 120 folds the base paper sheet G in half along a first fold F1, which is a fold along the payout direction (X direction) from the base paper roll 110. The base paper sheet folded along the first fold F1 is referred to as base paper sheet G1.

[0029] At this time, the first folding device 120 folds the sheet so that the edge thereof is shifted by positioning the first fold F1 at a position shifted from the center position in the direction (Y direction) perpendicular to the unwinding direction of the base paper sheet G from the raw paper roll 110, as shown in FIG. 3. Specifically, it is preferable to fold the base paper sheet G so that the position of the first fold F1 is shifted 0.5 mm to 5.0 mm from the center position of the base paper sheet G in the Y direction, thereby shifting the position of the edge of the base paper sheet G in the Y direction by 1.0 mm to 10.0 mm, and it is even more preferable to fold the base paper sheet G so that the position of the first fold F1 is shifted 1.5 mm to 3.5 mm from the center position of the base paper sheet G in the Y direction, thereby shifting the position of the edge of the base paper sheet G in the Y direction by 3.0 mm to 7.0 mm.

[0030] [(3) Step S3: Embossing process] Next, the base paper sheet G1 folded in step S2 is subjected to embossing in the embossing device 130 provided in the toilet cleaner manufacturing system 100 to form projections and recesses.

[0031] 2, the embossing device 130 includes two rolls, a top roll 131 and a bottom roll 132. The top roll 131 and the bottom roll 132 are formed with concaves and convexes corresponding to the concave and convexes pattern to be formed on the base paper sheet G1, and the concaves and convexes formed on the top roll 131 and the concaves and convexes formed on the bottom roll 132 are adapted to interlock with each other. By passing the base paper sheet G1 between these, the base paper sheet G1 can be compressed and unevenness can be formed.

[0032] In this case, the base paper sheet G1 is embossed over the entire surface in a state where it is folded at the first fold F1 so that concave and convex portions are arranged alternately.

[0033] 4, convex embossments E1, which are portions that are convex on one side (upward) in the Z direction, and concave embossments E2, which are portions that are concave on one side (upward) in the Z direction (convex on the other side (downward) in the Z direction), are arranged alternately in both the X and Y directions. The flat portion between the convex embossments E1 and the concave embossments E2 is referred to as an intermediate portion M. The concave embossment E2 has a shape obtained by inverting the convex embossment E1 in the thickness direction (Z direction) of the sheet, and the middle portion M is located between the convex embossment E1 and the concave embossment E2 in the Z direction.

[0034] The shape of the convex embossments E1 and the concave embossments E2 is preferably a generally elliptical shape that is longer in the Y direction than in the X direction, and a gourd shape with a constricted portion on the long side, as shown in FIG.

[0035] Furthermore, since the base paper sheet G1 folded at the first fold F1 is embossed in step S2, the unevenness formed on one side of the first fold F1 and the unevenness formed on the other side of the first fold F1 inevitably combine, as shown in FIG. 5, so that the convex portion on one side of the first fold F1 fits into the concave portion on the other side of the first fold F1.

[0036] [(4) Step S4: Cutting Process] Next, in step S3, the embossed base paper sheet G1 is cut by passing it through the cutting device 140 provided in the toilet cleaner manufacturing system 100. The cut base paper sheet is referred to as base paper sheet G2.

[0037] As a result, the base paper sheet G2 is folded as shown in Figure 6(a) by the first fold F1, which is a fold parallel to the direction (X direction) along the long side when the first fold F1 is unfolded, so that the positions of both ends in the direction (Y direction) along the short side when the first fold F1 is unfolded are shifted.

[0038] The size of the base paper sheet G2 after cutting, when the first fold F1 is unfolded, is preferably a rectangle with long sides (X direction) of 100 mm to 200 mm and short sides (Y direction) of 50 mm to 100 mm, and more preferably a rectangle with long sides (X direction) of 120 mm to 150 mm and short sides (Y direction) of 70 mm to 100 mm.

[0039] [(5) Step S5: Second Folding Process] The base paper sheet G2 cut in step S5 is carried by the first conveyor C1 to the second folding device 150 provided in the toilet cleaner manufacturing system 100, where it is folded into eight folds.

[0040] Specifically, the second folding device 150 first folds the base paper sheet G2, which has been folded in half in the Y direction at the first fold F1 as shown in Fig. 6(a), at the second fold F2, which is a fold along the Y direction located in the center of the base paper sheet G2 in the X direction, as shown in Fig. 6(b). As a result, the base paper sheet is folded in four. The base paper sheet in this state is referred to as base paper sheet G3.

[0041] Furthermore, the second folding device 150 folds the base paper sheet G3, which has been folded in the Y direction at the first fold F1 and in the X direction at the second fold F2 to be folded in four as shown in Fig. 6(b), at the third fold F3, which is a fold along the Y direction located in the center of the base paper sheet G3 in the X direction, as shown in Fig. 6(c). As a result, the base paper sheet is folded in eighth folds. The base paper sheet in this state is referred to as base paper sheet G4.

[0042] [(6) Step S6: Chemical impregnation process] The base-paper sheet G4 folded in step S5 is placed on the second conveyor C2 and transported, and while being transported, is impregnated with the chemical solution L by a chemical solution impregnation device 160 provided above the second conveyor C2.

[0043] The chemical liquid impregnation device 160 includes a spray nozzle 161 that sprays the chemical liquid L, a tank 162 that stores the chemical liquid L, and a pipe 163 that connects the spray nozzle 161 and the tank 162. The chemical liquid L stored in the tank 162 is sprayed from the spray nozzle 161, which is provided above the second conveyor C2, thereby impregnating the base paper sheet G4 with the chemical liquid L.

[0044] The amount of the chemical solution L impregnated is preferably 100% to 500% by mass relative to the mass of the base-paper sheet G4, and more preferably 150% to 300% by mass.

[0045] The composition of the chemical solution L is not particularly limited, but it is preferable to use one that contains, for example, water and a crosslinking agent that crosslinks with the water-soluble binder, as well as auxiliary agents such as glycol ethers, aqueous detergents, preservatives, disinfectants, organic solvents, and fragrances.

[0046] As the crosslinking agent, boric acid, various metal ions, etc. can be used, but when CMC is used as a water-soluble binder to be added to the base paper sheet G, it is preferable to use polyvalent metal ions. In particular, it is preferable to use one or more polyvalent metal ions selected from the group consisting of alkaline earth metals, manganese, zinc, cobalt, and nickel, because this will sufficiently bond the fibers to achieve wet strength sufficient for use while also providing sufficient water-disintegrability. Of these metal ions, it is particularly preferable to use ions of calcium, strontium, barium, zinc, cobalt, and nickel.

[0047] Glycol ethers are compounds in which the hydroxyl groups at one or both ends of a dihydric alcohol, glycol, are etherified. They contain a hydrophobic alkyl group and a hydrophilic ether and hydroxyl group within the molecule. Compared to surfactants, glycol ethers have a smaller molecular weight and lower dynamic surface tension than conventional detergents containing only surfactants, allowing for faster interface formation between the chemical solution and dirt. Glycol ethers also function as coupling agents, compatibilizing hydrophobic oils and dirt with water, separating the dirt and preventing it from reattaching. Therefore, adding glycol ethers to chemical solutions can improve the wiping performance of toilet cleaners.

[0048] Examples of glycol ethers that may be contained include propylene glycol monomethyl ether (PGME), diethylene glycol monobutyl ether (DGME), ethylene glycol monomethyl ether, diethylene glycol monomethyl ether, triethylene glycol monomethyl ether, polyethylene glycol monomethyl ether, ethylene glycol isopropyl ether, diethylene glycol monoisopropyl ether, triethylene glycol monomethyl ether, polyethylene glycol monomethyl ether, ethylene glycol isopropyl ether, diethylene glycol monoisopropyl ether, and ethylene glycol monobutyl ether.

[0049] Of these, PGME is usually added as a cleaning component and is known to improve cleaning power, but it also has the effect of directly improving sheet strength, enhancing the sheet strength-improving effects of CMC and polyvalent metal ions. When PGME is applied to base paper sheet G, the amount applied is 20 g / m 2 from 60 g / m 2 and more preferably 26 g / m 2 from 40 g / m 2 is.

[0050] As the aqueous detergent, for example, a surfactant and a lower or higher (aliphatic) alcohol can be used.

[0051] As the preservative, for example, parabens such as methylparaben, ethylparaben, and propylparaben can be used.

[0052] Examples of disinfectants that can be used include benzalkonium chloride, chlorhexidine gluconate, povidone-iodine, ethanol, benzanium cetyl oxide, triclosan, chloroxylenol, phenoxyethanol, and isopropylmethylphenol.

[0053] As the organic solvent, polyhydric alcohols such as glycol (dihydric), glycerin (trihydric), and sorbitol (tetrahydric) can be used.

[0054] As the fragrance, for example, rose oil, spearmint oil, L-citronellal, etc. can be used.

[0055] In addition, the adjuvants for the components of the above-mentioned medicinal solution can be selected appropriately, and components that perform other functions may be contained in the medicinal solution as needed. For example, propylene glycol (PG) can be used as an adjuvant to solubilize preservatives and disinfectants.

[0056] Furthermore, the method of impregnating the base-paper sheet G4 with the chemical solution L is most preferably spray application using the spray nozzle as described above, but is not limited to this as long as it can impregnate the base-paper sheet G4 with an appropriate amount of the chemical solution L. For example, impregnation may be performed by a method such as nozzle impregnation or roll transfer, as long as it can impregnate the base-paper sheet G4 with an appropriate amount of the chemical solution L.

[0057] [(7) Step S7: Lamination Process] The base-paper sheets G4 impregnated with the chemical solution L in step S6 are transported by the second conveyor C2 to the stacking device 170 provided in the toilet cleaner manufacturing system 100, where multiple sheets are stacked. The stack of multiple base-paper sheets G4 formed after stacking is referred to as a sheet block B. The number of sheets to be stacked is not particularly limited, but about 10 sheets is preferable.

[0058] [(8) Step S8: Packaging process] The sheet blocks B stacked in step S7 are transported by the third conveyor C3 to the packaging device 180 provided in the toilet cleaner manufacturing system 100, where they are packaged. The specific packaging method is not particularly limited as long as it can suppress the evaporation of the chemical solution L and prevent the sheet block B from drying out.

[0059] [2. Explanation of effects] According to this embodiment, in the first folding process (step S2), the base paper sheet G is folded so that the edges are shifted by a predetermined width, and then in the embossing process (step S3), unevenness is formed on the base paper sheet G1 in the state folded in step S2. This allows the position of the fold (first fold F1) to be determined during folding in the first folding process (step S2) without being affected by the position of the protrusions and recesses, and in the embossing process (step S3) which is carried out in a folded state, the convex portion on one side of the first fold F1 and the concave portion on the other side of the first fold F1 will inevitably overlap.

[0060] Therefore, according to this embodiment, it is easy to adjust the deviation width of the ends when folding in the first folding process (step S2) to an appropriate width that makes it easy to unfold the first fold F1, and since the convex portion on one side of the first fold F1 overlaps the concave portion on the other side of the first fold F1, the unevenness is less likely to be crushed when folded, making it easier to improve both the resistance of the unevenness to being crushed when folded and the ease with which the folds can be unfolded for household tissue paper with unevenness formed thereon.

[0061] Furthermore, when embossing and then folding the paper so that the convex portion on one side of the fold line overlaps the concave portion on the other side of the fold line, even a slight misalignment of the fold line causes the convex portion on one side of the fold line to no longer overlap the concave portion on the other side of the fold line, making the embossment prone to being crushed. Furthermore, household tissue paper that loses its embossed shape must be discarded as being of poor quality, which increases costs. In this regard, according to this embodiment, it is possible to ensure that the convex portion on one side of the first fold F1 and the concave portion on the other side of the first fold F1 overlap, thereby reducing the increase in costs due to the occurrence of poor quality products as described above.

[0062] Furthermore, when household tissue paper is used in a double layer without unfolding the first fold F1, the strength of the sheet can be improved because the unevenness fits snugly together.

[0063] Furthermore, in the second folding process (step S5), the base paper sheet G2, which has had the unevenness formed in the embossing process (step S3), is further folded, so that the base paper sheet G2, which has had the unevenness formed in the state of being folded in half in the first folding process (step S2), can be further folded to a size suitable for packaging.

[0064] Furthermore, by performing the first folding process (step S2) before the embossing process (step S3) and performing the second folding process (step S5) after the embossing process (step S3), the embossing process (step S3) is performed on the base paper sheet G1 that has been folded once in the first folding process (step S2) and is in a double-layered state. In this regard, if the base paper sheet is stacked in multiple layers during embossing, there is a risk that the unevenness formed during embossing will become unclear. However, by performing only the first folding step (step S2) before the embossing step (step S3) as described above, and performing the second folding step (step S5), which involves folding the sheet for the second or subsequent time, after the embossing step (step S3), it is possible to obtain the above-mentioned effects while suppressing the adverse effect of the unevenness caused by embossing becoming unclear.

[0065] Furthermore, by positioning the first fold F1 at a position that is shifted 0.5 mm to 5.0 mm from the center of the base paper sheet G in a direction perpendicular to the first fold F1, the position of the edge of the base paper sheet G1 folded at the first fold F1 in a direction perpendicular to the first fold F1 can be shifted within an appropriate range of 1.0 mm to 10.0 mm, making it easier to unfold the first fold F1.

[0066] Furthermore, by positioning the first fold F1 at a position that is shifted 1.5 mm to 3.5 mm from the center of the base paper sheet G in a direction perpendicular to the first fold F1, the position of the edge of the base paper sheet G1 folded at the first fold F1 in a direction perpendicular to the first fold F1 can be shifted within a more appropriate range of 3.0 mm to 7.0 mm, making it easier to unfold the first fold F1.

[0067] [3 Variations] A modification of this embodiment will now be described.

[0068] In the above description of the manufacturing method, we have explained a case where the base paper sheet is folded into eight folds by folding it once in the Y direction at the first fold F1 in the first folding process (step S2), and then folding it twice in the X direction at the second fold F2 and the third fold F3 in the second folding process (step S5). In this regard, although the above-described folding method is most preferable, the folding method of the base-paper sheet is not limited to this. For example, the base-paper sheet may be folded only once in the second folding step (step S5) so that the sheet is folded in four, or may be folded three or more times so that the base-paper sheet is folded even more multiple times.

[0069] Furthermore, in the above description of the manufacturing method, the edge portions are folded so as to be offset only in the first folding process (step S2). However, in addition to this, the positions of the second fold F2 and the third fold F3 may also be shifted from the center in the X direction in the second folding process (step S5), so that the edge portions are folded so as to be offset by a predetermined width.

[0070] In this regard, the first fold F1, which is folded first, is the most difficult to unfold when in use, and the subsequent folds (second fold F2 and third fold F3) are folded in a state where multiple layers are stacked on top of each other, and are therefore often easy to unfold in the first place, so there is little problem with ease of unfolding even if there is no misalignment at the edges.However, by making the edges misaligned in the second folding process (step S5), in which the sheet is folded for the second time and beyond, although this increases the complexity of the folding process, it is possible to make the folds from the second fold F2 onwards even easier to unfold.

[0071] Furthermore, in the description of the above manufacturing method, the fold in the second folding process (step S5) is described as not being in a state in which the convex portion on one side of the fold overlaps the concave portion on the other side of the fold, but the fold in the second folding process (step S5) may also be configured so that the convex portion on one side of the fold overlaps the concave portion on the other side of the fold. In other words, by positioning the second fold F2 and the third fold F3 at the midpoint between the convex embossing E1 and the concave embossing E2 formed in the embossing process (step S3), when folded, the convex portion on one side of the fold overlaps with the concave portion on the other side of the fold, and the convex portion on one side of the fold fits into the concave portion on the other side of the fold.

[0072] In this regard, as long as the convex portion on one side of the first fold F1 overlaps the concave portion on the other side of the first fold F1, the concave and convex portions of the sheet will overlap twice, which will have the effect of improving the resistance to crushing of the concave and convex portions when folded.However, in addition, if the convex portion on one side of the fold and the concave portion on the other side of the fold also overlap for the second and subsequent folds, the complexity of the folding process will increase, but the concave and convex portions of the sheet will overlap four or more times, making it even more difficult for the concave and convex portions to be crushed when folded.

[0073] Furthermore, in the explanation of the above manufacturing method, the manufacturing of toilet cleaner used for cleaning toilets was described as an example of household tissue paper, but the household tissue paper manufactured is not limited to toilet cleaner, and household tissue paper for other uses can also be manufactured through a similar process. For example, a manufacturing method involving steps similar to those described above can be used when manufacturing floor cleaning sheets used to clean floors, kitchen cleaning sheets used to clean kitchens, antiperspirant sheets for wiping the skin, etc. [Explanation of symbols]

[0074] 100 Toilet Cleaner Manufacturing System 110 Raw roll 120 First folding device 130 Embossing device 140 Cutting device 150 Second folding device 160 Chemical impregnation equipment 170 Stacking device 180 Packaging equipment G, G1, G2, G3, G4 base paper sheets F1 First fold F2 Second fold F3 Third fold E1 Convex embossing E2 concave embossing M middle part L chemical solution B Seat block

Claims

1. a first folding step of folding the base-paper sheet at a first fold line so that the edges are offset; a concave-convex forming step of forming concave-convex on the base-paper sheet folded in the first folding step; a cutting step of cutting the base-paper sheet on which the concave-convex portions have been formed in the concave-convex portion forming step; a second folding step of further folding the base-paper sheet after cutting in the cutting step; Including, In the second folding step, the base paper sheet is folded in a state in which the unevenness formed on one side of the first fold in the base paper sheet and the unevenness formed on the other side of the first fold in the base paper sheet are combined, and the convex portion on one side of the first fold in the base paper sheet fits into the concave portion on the other side.

2. 2. The method for manufacturing tissue paper for household use according to claim 1, wherein the base paper sheet after cutting in the cutting step is rectangular with all folds unfolded, and in the first folding step, the base paper sheet is folded at the first fold that is parallel to one of the sides of the base paper sheet in that state.

3. 3. The method for manufacturing tissue paper for household use according to claim 2, wherein the first fold is a fold parallel to a long side of the base paper sheet in the state.

4. The method for manufacturing tissue paper for household use according to claim 2, characterized in that the first fold is offset by 0.5 mm or more and 5.0 mm or less from the center of the base paper sheet in the direction perpendicular to the first fold in the said state.

5. The method for manufacturing tissue paper for household use according to claim 4, characterized in that the first fold is offset by 1.5 mm to 3.5 mm from the center of the base paper sheet in the direction perpendicular to the first fold in the state.

6. a first folding means for folding the base paper sheet at a first fold line so that the edges are offset; a concave-convex forming means for forming concave-convex shapes on the base-paper sheet folded by the first folding means; cutting means for cutting the base paper sheet on which the concave-convex portions have been formed by the concave-convex forming means; a second folding means for further folding the base-paper sheet after being cut by the cutting means; Equipped with The second folding means is configured to fold the base paper sheet in a state in which the protrusions on one side of the first fold in the base paper sheet and the protrusions on the other side of the first fold in the base paper sheet are combined, and the protrusions on one side of the first fold in the base paper sheet are inserted into the recesses on the other side.

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