Hydrolytic toilet paper and toilet paper roll having antibacterial property

Abstract

This invention provides hydrolyzed toilet paper with antibacterial properties. The toilet paper is composed of 3 or 4 sheets, each with a basis weight of 12.0–16.0 g / m³. 2 Each sheet of paper has a thickness of 80 to 140 μm, and at least one adjacent sheet is joined at multiple joint points using an adhesive (10), wherein the adhesive (10) is polyvinyl alcohol and contains benzalkonium chloride.

Description

Technical Field

[0001] This invention relates to hydrolyzed toilet paper and toilet paper rolls with antibacterial properties. Background Technology

[0002] Recently, with increasing awareness of antibacterial properties in daily life, some sensitive users are demanding that toilet paper itself be antibacterial. In addition, with the widespread use of warm water toilet seats, people tend to seek toilet paper with more layers to prevent it from tearing due to water during use.

[0003] To make toilet paper rolls antibacterial, there are methods such as spraying antibacterial agents onto the paper tube or the end of the roll. However, the antibacterial effect is not continuous, the amount of antibacterial agent adhering is limited, and the effect is sometimes unsatisfactory.

[0004] Conversely, if too much antibacterial agent is applied, the ends of the roll will become loose, and the paper will stick together, sometimes causing problems. Applying antibacterial agents to the surface of toilet paper can sometimes significantly impair its quality.

[0005] In addition, in sheet products such as kitchen paper and toilet paper, bonding is sometimes achieved through embossing. Patent document 1 proposes to use carboxymethyl cellulose (CMC) or polyvinyl alcohol (PVA) as adhesives for coating the embossed raised parts.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent No. 4420872 Summary of the Invention

[0009] The problem that the invention aims to solve

[0010] With increased awareness of antibacterial properties, users want antibacterial agents added to toilet paper, but the development of toilet paper with both antibacterial and hydrolyzable properties has not made much progress.

[0011] Therefore, the main objective of this invention is to provide toilet paper and toilet rolls that are antibacterial, soft, and sufficiently hydrolyzable during use.

[0012] Methods for solving problems

[0013] The absorbent material that solves the above problem is described below.

[0014] A type of toilet paper, characterized in that,

[0015] It consists of 3 or 4 layers.

[0016] The basis weight of each tablet is 10.0–18.0 g / m³. 2,

[0017] The thickness of each sheet of paper is 60–170 μm.

[0018] At least one adjacent piece is joined at multiple joint points using an adhesive.

[0019] The adhesive is polyvinyl alcohol and contains benzalkonium chloride.

[0020] Invention Effects

[0021] According to the present invention, hydrolyzable toilet paper composed of two or more sheets that exhibits antibacterial properties during use can be provided. Attached Figure Description

[0022] Figure 1 This is a top view of the toilet paper of the present invention.

[0023] Figure 2 This is a cross-sectional view of the embossed portion for bonding the toilet paper of the present invention.

[0024] Figure 3 This is a schematic diagram illustrating the manufacturing process of the toilet paper according to the present invention.

[0025] Figure 4 This is a schematic diagram illustrating the lamination and embossing process in the manufacturing process of the toilet paper of the present invention. Detailed Implementation

[0026] The following description, with reference to the accompanying drawings, details the toilet paper of the present invention, which is bonded using a water-soluble adhesive containing an antibacterial agent. Figure 2 and Figure 4 The invention illustrates a four-ply toilet paper, but is not limited thereto; it can also be applied to three-ply or two-ply toilet paper.

[0027] In particular, to prevent breakage due to contact with moisture in bodily fluids or the washing water of a warm toilet seat and to reliably exert antibacterial properties, 3-ply or 4-ply toilet paper (roll toilet paper) is preferred.

[0028] This toilet paper is made by laminating two or more sheets (layers), with adjacent sheets joined together at multiple joint points using adhesive.

[0029] The preferred product has a basis weight of 10.0–18.0 g / m², obtained by dividing the basis weight of each sheet by the number of layers. 2 Especially 12.0~16.0g / m 2 The thickness of each sheet obtained by dividing the paper thickness of the product by the number of layers is 60-170μm, and particularly 80-140μm.

[0030] If the basis weight and paper thickness are too low, the paper is particularly prone to tearing due to contact with moisture; if the basis weight and paper thickness are too high, the cost is high and the flexibility is compromised.

[0031] The basis weight here is based on the basis weight determination method of JIS P 8124 (1998), and the paper thickness refers to the average value obtained by performing 5 measurements under the conditions of JIS P 8111 (1998) using a dial-type thickness gauge (thickness measuring instrument "PEACOCK H type" (manufactured by Ozaki Corporation) under the same conditions after sufficient humidification. In addition, the basis weight and paper thickness are measured in a multi-layer condition.

[0032] At least one adjacent sheet is joined at multiple joint points using an adhesive, preferably only between one adjacent sheet as described below, wherein the adhesive is polyvinyl alcohol and contains benzalkonium chloride.

[0033] Polyvinyl alcohol is a water-soluble adhesive. This adhesive contains benzalkonium chloride as an antibacterial agent.

[0034] When in use, water or moisture from bodily fluids seeping from excrement (or warm water for a warm water toilet seat) seeps into the pad and comes into contact with a water-soluble adhesive containing an antibacterial agent. A portion of the water-soluble adhesive dissolves and comes into contact with the antibacterial agent in the adhesive, thereby exerting an antibacterial effect and preventing bacteria from transferring to the hands.

[0035] Typically, carboxymethyl cellulose (CMC) is used as an adhesive for toilet paper to improve the material's softness.

[0036] However, it was discovered that when benzalkonium chloride, which is safe and has a high antibacterial effect, is mixed as an antibacterial agent, CMC agglomerates, tends to lose its adhesiveness, and when attempting to transfer this adhesive to the sheet by transfer coating, the reduced viscosity leads to a decrease in the amount of transfer or the inability to pick it up, which will cause obstacles in the lamination operation.

[0037] In contrast, it was found that when polyvinyl alcohol (PVA) was used instead of carboxymethyl cellulose, adhesive aggregation caused by benzalkonium chloride did not occur.

[0038] On the other hand, it is known that polyvinyl alcohol (PVA) is a harder material than carboxymethyl cellulose as an adhesive, which results in impaired flexibility of the laminated sheets.

[0039] However, it was found that the flexibility of the laminated sheets was not compromised when using the following configuration: instead of joining adjacent sheets across the entire surface, adhesives were used to join multiple joint points, preferably only at multiple joint points between one adjacent sheet.

[0040] From this perspective, the area occupied by embossing processing EL related to adhesive coating is preferably within 1m². 2 The concentration is 2.5% to 30%, and particularly preferably 5% to 15%. If the area ratio is too small, it cannot be used as a pattern; conversely, if the area ratio is too large, it will form an excessive pattern, which is not ideal for product design. Moreover, if the area occupied by the embossing is large, the amount of adhesive used will increase, and the hardness caused by polyvinyl alcohol (PVA) will become more obvious.

[0041] On the other hand, considering adjusting the concentration of the adhesive, for example, to the extent of 0.065 to 0.08% (converted from solid component ratio) in the case of CMC, it was found that in the case of polyvinyl alcohol (PVA), for example, reducing the concentration to the extent of 0.04 to 0.06% (converted from solid component ratio), for a single bonding point, by reducing the amount of polyvinyl alcohol (PVA) applied, the flexibility of the laminated sheet was not impaired.

[0042] It was found that even with a reduced amount of polyvinyl alcohol (PVA) used, the bond strength was sufficient and delamination did not occur.

[0043] The toilet paper of the embodiment exhibits sufficient hydrolytic properties. For example, after being dried with hot air in a dryer at 105°C for 10 minutes, the hydrolytic properties, based on JIS P 4501, are preferably within 80 seconds.

[0044] This is because the amount of adhesive used per unit area is small, and the bonding points (area ratio) of the adhesive are small.

[0045] As an embodiment, a 50% benzalkonium chloride solution (preferably) as an antibacterial agent is preferably contained in 1.2 to 17.8% by mass, and particularly preferably in 3.6 to 14.4% by mass, relative to a 7-fold diluted 25% polyvinyl alcohol (7-fold diluted, essentially 3.6%).

[0046] If the amount of benzalkonium chloride is small, the amount of polyvinyl alcohol dissolved due to contact with water is limited, resulting in a low likelihood of exhibiting the antibacterial effect of benzalkonium chloride. If the amount of benzalkonium chloride is large, the adhesive containing benzalkonium chloride will have reduced viscosity and bonding strength.

[0047] The pH of the polyvinyl alcohol adhesive containing benzalkonium chloride is preferably managed to be 6.0 to 7.0. Furthermore, when the adhesive is diluted at a suitable dilution ratio (e.g., adhesive:water = 1:5 to 1:9, a ratio of, for example, 10 to 17%) and the pH is adjusted to, for example, 5.0 to 6.0 (weakly acidic), the polyvinyl alcohol adhesive can exhibit sufficient adhesiveness, forming a viscosity suitable for lamination operations, for example, 8.0 to 14.8 (mPa·s), preferably 8.8 to 11.8 (mPa·s).

[0048] Based on this viewpoint, polyvinyl alcohol (PVA) adhesives, even when mixed with benzalkonium chloride, do not lose their adhesive properties, nor do their viscosity change significantly. Therefore, they can operate stably. This is understood to be because PVA has fewer negatively charged -OH (hydroxyl) groups than carboxymethyl cellulose, making it less prone to aggregation than benzalkonium chloride, and thus does not reduce adhesiveness or viscosity.

[0049] The amount of benzalkonium chloride applied relative to the unit mass of toilet paper is preferably 0.01 to 0.1% by mass. This is an optimal amount based on the consideration of maintaining safety for the human body while exerting antibacterial effects, and maintaining viscosity and adhesiveness.

[0050] The amount of laminating adhesive (polyvinyl alcohol) applied to the laminated tissue paper is preferably 0.02 to 0.10% (converted to solids content), and particularly preferably 0.04 to 0.06% by mass (converted to solids content). If the amount applied is too low, delamination is more likely to occur, and the antibacterial effect may also be insufficient. If the amount applied is too high, the softness of the resulting sheet will be compromised.

[0051] As antibacterial agents, quaternary ammonium salts such as benzalkonium chloride and benzyl chloride, as well as cationic surfactants with antibacterial properties such as pyridinium salts, imidazolineium salts, and isoquinolineium salts can be used.

[0052] As mentioned above, the pH value of cold water extraction of toilet paper is preferably managed to be 6.0 to 8.0.

[0053] The pH value of toilet paper extracted by cold water can be determined by the cold water extraction method according to JIS P 8133-1998 7.2.

[0054] The optimal pH range for cold water extraction is between 6.0 and 8.0. When the pH of the adhesive is between 6.0 and 7.0, the adhesiveness and bonding function of the adhesive containing benzalkonium chloride can be appropriately maintained.

[0055] At this point, when using a binder containing benzalkonium chloride in multi-layer toilet paper, the cold water extraction pH is 6.0–8.0, which can result in multi-layer laminated toilet paper that maintains a good balance between antibacterial effect and the adhesive function of the binder.

[0056] The innermost sheet is preferably coated with micro-embossing and bonded to the embossing of the adjacent sheet.

[0057] The coating amount of the above adhesive is preferably 0.02 to 0.10% (converted to solid content) relative to the weight of the product, and particularly preferably 0.04 to 0.06% (converted to solid content) by mass.

[0058] The area ratio of the raised portion of all embossed sections is preferably 15.0% to 25.0%.

[0059] In the embossed raised portion, the area ratio of the large (deep) embossed portion coated with adhesive (polyvinyl alcohol) is preferably 10.0% to 15.0%. The area ratio of the micro-embossed portion is preferably 5.0% to 10.0%.

[0060] Embossing enhances design flexibility and imparts softness to the toilet paper product. Furthermore, the spaces created between layers due to embossing also affect hydrolytic properties.

[0061] Embossing is applied to a wide range of areas on the paper surface to enhance its aesthetics, fluffiness, softness, and smoothness. It is a different technique from embossing in lamination processes such as contact embossing.

[0062] The design of the raised and recessed patterns imparted by embossing, the depth of the recesses (embossing depth), the density of the recesses (embossing density), the planar shape of each recess, and the total area of ​​the recesses (embossed area) can be appropriately determined considering aesthetics, fluffiness, softness, and surface smoothness, and need not be limited. In this embodiment, since embossing is performed on a 2-3 layer laminated continuous sheet, and it is laminated and bonded to a 1-2 layer laminated continuous sheet in the later stage, from the perspectives of adhesion, aesthetics, and fluffiness, the depth of the recesses is preferably 0.05-2.0 mm, and the bottom area of ​​one recess is 0.3-5.0 mm. 2 Embossing area ratio is 5.0-15%, and embossing density is 3-25 embossings / cm². 2 Of course, it can also be made into a variety of different concave shapes.

[0063] Here, the embossing density is the value obtained by counting the number of embossings within a 10cm × 10cm area and converting it to a value for every 1cm × 1cm. It should be noted that this is the average of 5 points within the 10cm × 10cm area. The embossing area ratio is measured within a 10cm × 10cm area.

[0064] Furthermore, the ratio of the total embossed area obtained by multiplying the number of recesses within this range by the bottom area of ​​the recesses is used as the embossed area ratio. Similar to the embossed density, this is the average value of five locations within a 10cm × 10cm range.

[0065] The bottom surface area of ​​the recess was measured using a ONESHOT 3D measuring microscope VR-3200 or equivalent equipment manufactured by Keyence Corporation, along with the image analysis software "VR-H2A". It should be noted that the bottom surface area of ​​the recess is the average of five recesses of the same design. The depth of the recess was measured using a ONESHOT 3D measuring microscope VR-3200 or equivalent equipment manufactured by Keyence Corporation, along with the image analysis software "VR-H2A" or equivalent software. Measurements were performed at 12x magnification and a field of view area of ​​24mm × 18mm. The magnification and field of view area can be appropriately varied according to the size of the recess. Specifically, the measurement process involved using the aforementioned software to obtain the embossing depth (measurement cross-sectional curve) distribution at the line segment transversely cut across the longest portion of the periphery of an embossing in the image portion displayed from a top-down view. Using a low-pass filter, surface roughness components with wavelengths shorter than λc (800 μm, where λc is the "filter defining the boundary between roughness components and ripple components" described in JIS-B0601 "3.1.1.2") are removed from the cross-sectional curve of the embossing depth distribution. From the resulting profile curve of the image portion displayed in a cross-sectional view, the two most upwardly convex and curved recess edge points, and the minimum value between these recess edge points, are determined as the minimum depth, Min. Furthermore, the average depth value of the recess edge points is taken as the maximum depth, Max. Thus, embossing depth = maximum Max - minimum Min. Additionally, the distance (length) between the recess edge points on the plane is defined as the length of the longest portion. The two most upwardly convex and curved recess edge points are selected visually. It should be noted that the profile in the top-view image of the recess being measured can be used as a reference during selection. Similarly, for the shortest part in the direction perpendicular to the longest part, the depth of the embossing (recess) is also measured, and the larger value is taken as the depth of the embossing (recess). The above measurements are performed on any 10 embossings on the surface, and the average value is taken as the depth of the recess.

[0066] (Example of the structure of toilet paper or toilet paper rolls)

[0067] Toilet paper is made by laminating the layers together to form a roll of toilet paper.

[0068] Furthermore, at least one adjacent piece is joined at multiple joint points using an adhesive.

[0069] Figure 2 The structure of a four-ply toilet paper roll is shown. The outer side of the toilet paper roll is shown as OUT, and the inner side is shown as IN. In this embodiment, the three layers 1, 2, and 3 starting from the outer OUT are integrally embossed with a large (deep) texture, forming a recess 7 on the outer OUT and a protrusion 8 on the inner IN.

[0070] The inner side of the third layer 3 (outer side) and the inner side of the fourth layer (in side) are bonded together using adhesive 10.

[0071] The adhesive 10 is polyvinyl alcohol and contains benzalkonium chloride.

[0072] In this implementation, two embossing processes, EL and ES, are formed. Specifically, a large (deep) embossing process EL is performed on layers 1, 2, and 3 to achieve lamination and thereby suppress delamination between the layers; a small (micro) embossing process ES is performed on layer 4 to bond layers 3 and 4 together using adhesive 10 for integration.

[0073] If necessary, at least the interlayers of layers 1, 2, and 3 may be bonded at their joints using an adhesive, but it is preferred to bond only one layer using an adhesive. Typically, layers 1, 2, and 3 can be prevented from delaminating by embossing (ES). If necessary, contact embossing may be applied to both sides of layers 1, 2, 3, or also layer 4, preferably during the production of toilet paper rolls, to prevent delamination.

[0074] Here, inks or the like can be mixed into the adhesive 10 to color it. When the adhesive 10 is colored, the adhesive portion (joint portion) based on the embossing process is colored, for example, appearing as... Figure 1 The patterns are recognizable and can enhance the design.

[0075] (Regarding adhesives containing antibacterial substances)

[0076] Various surfactants are known as antibacterial agents, among which quaternary ammonium salts, represented by benzalkonium chloride, exhibit strong antibacterial properties and are widely used for sterilization in homes and medical settings. Benzalkonium chloride is a cationic surfactant with advantages such as strong antibacterial activity, odorlessness, high water solubility, and low irritation. Therefore, it is not limited to benzalkonium chloride; other cationic surfactants with antibacterial properties, such as benzyl chloride, pyridinium salts, imidazoline onion salts, and isoquinoline onion salts, can also be used.

[0077] (Coating method for adhesives containing antibacterial agents)

[0078] There are no particular limitations on the fiber raw materials for the base paper; suitable pulp materials for toilet paper can be selected. A preferred example is a raw material made by blending NBKP (coniferous sulfate pulp) and LBKP (broadleaf sulfate pulp) in an appropriate ratio.

[0079] The mixing ratio at this time (JIS P 8120) can be NBKP:LBKP = 20:80 to 80:20, and is particularly preferred to be NBKP:LBKP = 30:70 to 60:40.

[0080] Examples of chemicals added to paper stock include the aforementioned dry strength agents, softeners, and transient wet strength agents.

[0081] Figure 3 and Figure 4 An example of four-ply toilet paper is shown. Four continuous sheets fed from four raw material rolls 12 are separated into three-layer sheets 3P and one-layer sheets 1P, and fed into a laminating and embossing apparatus 13. The three-layer sheets 3P are embossed 7,8 between a rubber roller 17 and an embossing roller 18. Next, an adhesive 10 containing an antibacterial agent, supplied from an anilox roller 15 and coated onto the entire surface of a printing plate 16, is applied to the front end of the protrusions 8 formed on the three-layer sheets 3P and fed to a merging roller 21.

[0082] On the other hand, the 1-layer sheet 1P is micro-embossed 4 between the rubber roller 19 and the embossing roller 20 and then sent to the merging roller 21. Afterwards, on the merging roller 21, the 1-layer sheet 4 is laminated and bonded to the 3-layer sheet 3 using an adhesive containing an antibacterial agent, forming a 4-layer structure. The 4-layer toilet paper 4P is then wound using a rewinder 14.

[0083] When there are 3 layers, the same manufacturing method can be used to manufacture them by combining only 2 layers and 1 layer.

[0084] (Example of toilet paper)

[0085] In the first example, for toilet paper composed of two or more layers, multiple points between the layers are bonded using a water-soluble adhesive containing an antibacterial agent. As illustrated in the example, the basis weight of the four layers is 14.6 g / m³. 2 The paper thickness is 395μm.

[0086] Polyvinyl alcohol was used as an adhesive, benzalkonium chloride was added, and a colorant was also added.

[0087] The polyvinyl alcohol containing benzalkonium chloride is controlled at pH 5.0–8.0. When applying the adhesive, it is diluted at a ratio of 1:6 to adjust the pH to a weakly acidic state of 5.0–6.0 for use.

[0088] As a result, polyvinyl alcohol maintained its adhesive properties, achieving a viscosity of 10.3 mPa·s suitable for lamination operations. No significant change was observed in the pH after initial adjustment, even over time; adhesives with pH below 7.0 exhibited viscosity suitable for lamination. Figure 3 and Figure 4 It is applied stably to toilet paper in a certain way.

[0089] (pH changes based on antibacterial agent mixing ratio)

[0090] Table 1 shows the pH changes over time when the mixing ratio of 50% benzalkonium chloride (CATION G-50, manufactured by Sanyo Chemical Industries, Ltd., pH=9.0) is changed relative to the dilution obtained by diluting 25% polyvinyl alcohol (130M, pH 5.97) by 7 times.

[0091] [Table 1]

[0092]

[0093] Theoretically, if the pH is below 7.0, it has viscosity. Therefore, it can be concluded that when the antibacterial agent content of benzalkonium chloride at pH 9.0 is above 0.20%, the viscosity decreases, making it unsuitable for coating.

[0094] (pH changes based on antibacterial agent mixing ratio)

[0095] Table 2 shows the results of pH and viscosity measurements when the mixing ratio of 50% benzalkonium chloride (CATION F2-50R, pH=7) was changed relative to the diluted solution obtained by diluting 25% polyvinyl alcohol (130M, pH 5.97) by 7 times.

[0096] [Table 2]

[0097]

[0098] Even when the proportion of benzalkonium chloride at pH 7.0 is increased to 10%, the viscosity does not decrease. Therefore, it can be concluded that the viscosity of a benzalkonium chloride solution at pH 7.0 will not decrease and there is no problem.

[0099] (Comparison of the softness, etc., of CMC and PVA)

[0100] Table 3 shows the results of measurements of the softness, etc., of toilet paper based on TSA (“emtecTSA” sold by Nihon Rufuto Co., Ltd.).

[0101] HF: A parameter related to feel. The higher the value, the better the feel.

[0102] TS7: A parameter related to softness. The lower the value, the softer the feel.

[0103] TS750: A parameter related to smoothness. The lower the value, the smoother the ride.

[0104] D: Stiffness parameter. The lower the value, the stiffer the material.

[0105] [Table 3]

[0106] adhesive CMC PVA HF 84.9 85.0 TS7 10.72 10.64 TS750 44.71 43.59 D(mm / N) 2.29 2.28

[0107] No difference in paper quality was observed when carboxymethyl cellulose (CMC) was used in the adhesive compared to when polyvinyl alcohol (PVA) was used. PVA also maintained the same level of hand and touch feel as when carboxymethyl cellulose was used.

[0108] (Comparison of the hydrolytic properties of CMC and PVA)

[0109] Table 4 shows the results of the measurement of the time it takes for toilet paper to dissolve in water.

[0110] [Table 4]

[0111] number of floors 3 4 4 Types of laminating adhesives CMC series CMC series PVA series Hydrolytic 11.313 seconds 11.781 seconds 11.143 seconds

[0112] Compared to 3-ply and 4-ply toilet paper using carboxymethyl cellulose in the adhesive, 4-ply toilet paper using polyvinyl alcohol dissolves in water much faster. Regarding hydrolysis, polyvinyl alcohol performs slightly better.

[0113] (Antibacterial test)

[0114] Table 5 shows the following results: A 20mm × 30mm sample paper was immersed in 0.1 mL of each of the following cultures in a petri dish: *Escherichia coli*, *Staphylococcus aureus*, and *Candida albicans*. The culture was then suspended in 5 mL of PBS, and 1.0 mL was taken and incubated in a petri dish. The number of bacterial colonies was counted, and this count was used as the result. The experiment was repeated three times, and the antibacterial rate was calculated. The culture solution not used for immersion in the sample paper served as a control.

[0115] [Table 5]

[0116]

[0117] The antibacterial test results showed the number of colonies in 100 colonies whose growth was inhibited. If the growth of colonies was inhibited by more than 50%, there was an antibacterial effect; if it was inhibited by more than 90%, there was a strong antibacterial effect.

[0118] In sample paper containing polyvinyl alcohol, when benzalkonium chloride was present at 0.05% of the sample paper by mass, colonies of *Escherichia coli* and *Staphylococcus aureus* showed an antibacterial effect of more than 50%. When benzalkonium chloride was present at 0.08% and 0.10% of the sample paper by mass, colonies of *Escherichia coli*, *Staphylococcus aureus*, and *Candida albicans* also showed an antibacterial effect of more than 50%, thus confirming an antibacterial effect. In Example 3, where benzalkonium chloride was present at 0.10% of the sample paper by mass, a strong antibacterial effect against *Escherichia coli* was confirmed.

[0119] When comprehensively evaluating the above embodiments, it was confirmed that even when benzalkonium chloride antibacterial agent is added to the adhesive, toilet paper or roll toilet paper that fully utilizes the adhesive function can be stably manufactured.

[0120] Industrial applicability

[0121] This invention can impart antibacterial properties to 3-ply or 4-ply toilet paper or toilet paper rolls.

[0122] Symbol Explanation

[0123] 1, 2, 3, 4… layers, 7, 8… embossing, 10… adhesive, 13… lamination embossing equipment, OUT… outer side of roll, IN… inner side of roll, EL… large embossing, ES… small embossing.

Claims

1. A type of toilet paper roll, characterized in that, It is made by layering three or four sheets as the outer, middle, and inner sheets of a toilet paper roll, and then rolling them into a roll. The basis weight of each tablet is 10.0 g / m³. 2 ~18.0g / m 2 , The thickness of each sheet of paper ranges from 60μm to 170μm. Both the outer sheet and the middle sheet are embossed from the outside of the toilet paper roll, forming a concave portion on the outside and a convex portion on the inside. The middle sheet and the inner sheet are joined together at the convex portion using an adhesive. The adhesive is polyvinyl alcohol, and the adhesive contains benzalkonium chloride. It contains 1.2% to 17.8% benzalkonium chloride relative to polyvinyl alcohol.

2. The toilet paper roll as described in claim 1, wherein, The adhesive comprises 0.02% to 0.08% polyvinyl alcohol relative to the laminate.

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