Roller toilet paper

Abstract

The present invention provides a roll toilet paper suitable for use in a toilet with a cleaning function and easy to lengthen. The present invention is achieved by a roll toilet paper in which two layers of toilet paper are wound around a paper tube, the roll diameter of the roll toilet paper being 120 mm or less, the roll winding density being 0.74 to 1.30 m / cm 2 , and the roll density being 0.12 to 0.18 g / cm 3 .

Description

TECHNICAL FIELD

[0001] The present application relates to a roll toilet paper. BACKGROUND

[0002] With the spread of toilets with a washing function, there is a demand for toilet paper that is suitable for use in toilets with a washing function.

[0003] In a toilet with a washing function, in order to wash the defecation site or the urination site with warm water or water, it is necessary to wipe off the feces, urine, and water adhering to the skin due to washing.

[0004] Therefore, there is a demand for toilet paper that has wiping properties for skin with a large amount of water adhering thereto and high water absorption, and a sense of security when wiping. Here, as a technique for improving wiping properties and the like for skin with water adhering thereto, a laminated embossing technique is known. Laminated embossing is a technique in which embossed layers are layered using an adhesive paste, and the strength, thickness, and water barrier properties against water are improved.

[0005] On the other hand, toilet paper is generally sold on the market in the form of roll toilet paper wound around a paper tube. Furthermore, in recent years, there has been a growing trend toward elongation of the length of toilet paper wound around a paper tube, i.e., long-size development.

[0006] PRIOR ART DOCUMENTS

[0007] PATENT DOCUMENTS

[0008] Patent Document 1: Japanese Patent No. 6021532

[0009] Patent Document 2: Japanese Patent Application Laid-Open No. 2019-10366 SUMMARY

[0010] PROBLEMS TO BE SOLVED BY THE INVENTION

[0011] However, the paper thickness of toilet paper using the laminated embossing technique becomes too thick, and thus is not suitable for direct realization of long-size development.

[0012] On the other hand, if the basis weight of each layer is reduced in order to realize long-size development, the hand feeling such as softness, fluffiness, and smoothness is likely to decrease, and in particular, if the basis weight is reduced in toilet paper using the laminated embossing technique, a hard and hard feeling caused by the adhesive paste is likely to be felt.

[0013] Furthermore, the tactile sensation of the roll surface when the roll toilet paper is manufactured also deteriorates, and the user is likely to feel a harder impression.

[0014] Therefore, the present application has an object to provide a roll toilet paper which is excellent in wiping property and water absorption property for skin to which moisture is attached, is excellent in sense of security at the time of wiping, is suitable for elongation of toilet paper which is sufficient in softness, bulkiness, smoothness and the like, can recognize that the roll has a firm hardness and is elongated, and is excellent in tactile sensation of the surface of the roll.

[0015] Means for solving the problem

[0016] A first means for solving the above problem is a roll toilet paper in which two layers of toilet paper are wound around a paper tube, characterized in that

[0017] With respect to the roll toilet paper, the roll diameter is 120 mm or less, the roll winding density is 0.74 m / cm 2 to 1.30 m / cm 2 , the roll density is 0.12 g / cm 3 to 0.18 g / cm 3 .

[0018] A second means is the roll toilet paper of the first means, wherein

[0019] The roll compression rate of the roll toilet paper is 0.66 to 1.50.

[0020] A third means is the roll toilet paper of the first or second means, wherein

[0021] The toilet paper is formed by laminating a first sheet and a second sheet, and the first sheet has first and second recesses having different depths formed by embossing.

[0022] A fourth means is the roll toilet paper of the third means, wherein

[0023] The second sheet has a recess formed by embossing, and the depth of the recess is shallower than the depth of the first recess formed in the first sheet.

[0024] A fifth means is the roll toilet paper of the first to fourth means, wherein

[0025] The toilet paper is toilet paper to which an enzyme-based paper strength agent is applied.

[0026] A sixth means is the roll toilet paper of the first to fifth means, wherein

[0027] The toilet paper does not contain starch and cationized starch.

[0028] Effects of the invention

[0029] According to the present invention, a roll of toilet paper is provided that has high wiping and absorbency for skin with moisture, provides excellent comfort when wiping, and is suitable for long-size toilet paper with a good feel such as softness, fluffiness, and smoothness. The roll has a firm rigidity and is long in size, and the surface of the roll has an excellent tactile feel. Attached Figure Description

[0030] Figure 1 This is a perspective view of a toilet paper roll according to an embodiment of the present invention.

[0031] Figure 2 This is a schematic diagram illustrating the steps for measuring the embossing depth according to the present invention.

[0032] Figure 3 This is a schematic diagram illustrating the measurement method of MMD according to the present invention. Detailed Implementation

[0033] Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0034] like Figure 1 As shown, the toilet paper roll of this embodiment is formed by winding two layers of hydrolyzable toilet paper 10, consisting of a first sheet and a second sheet, onto a paper tube (also called a core) 20, resulting in a cylindrical shape. It should be noted that hydrolysis here refers to a looseness of 100 seconds or less according to JIS P 4501.

[0035] In conventional two-ply toilet paper rolls, the winding length is typically around 20 to 25 meters. However, the toilet paper roll of this embodiment is suitable for winding lengths of 34.5 to 55 meters, preferably 38 to 50 meters, and is suitable for long-sized products, sometimes referred to as 1.5 to 2 times the winding length. However, it is not necessarily limited to this winding length.

[0036] On the other hand, the roll diameter Ll (diameter) of the roll toilet paper of the present embodiment is 120 mm or less, preferably 107 to 119 mm. The roll diameter Ll of the roll toilet paper is specified as 120 mm or less in JIS P 4501, and a holder for setting a general roll toilet paper is made based on this 120 mm. The roll diameter of the roll toilet paper of the present embodiment is 120 mm or less, and can be set in a general holder. Here, the roll diameter Ll is a value measured using a diameter measuring scale manufactured by Mura Tech KDS Co., Ltd. or an equivalent device. The measured value is an average of measurements at three points in the width direction. Note that the average in the same manufacturing lot is an average of 5 rolls. In addition, the roll width L2 of the roll toilet paper of the present embodiment is not limited, but is preferably 100 to 130 mm. In addition, the paper tube outer diameter L3 is also not limited, and is

[0037] Here, the roll toilet paper of the present embodiment is characterized in that the roll winding density is 0.74 to 1.30 m / cm 2 , and the roll density is 0.12 to 0.18 g / cm 3 .

[0038] The roll winding density is represented by (winding length x number of layers) ÷ (cross-sectional area of the roll). The cross-sectional area of the roll is represented by {cross-sectional area of the roll diameter (outer diameter) Ll portion} - (cross-sectional area of the paper tube outer diameter L3 portion). Therefore, for example, in the case where the winding length = 46 m, the number of layers = 2, the roll diameter Ll = 115 mm, and the paper tube outer diameter L3 = 38 mm, the winding density = (46 m x 2) ÷ {3.14 x (115 mm ÷ 2 ÷ 10) 2 - 3.14 x (38 mm ÷ 2 ÷ 10) 2} = 0.99 m / cm 2 .

[0039] In addition, the roll density is represented by (roll mass) ÷ (roll volume). The roll mass is the mass of the roll toilet paper per 114 mm of roll width. The roll volume is represented by [{cross-sectional area of the roll diameter (diameter) Ll portion} - (cross-sectional area of the paper tube outer diameter L3 portion)] x roll width (converted to per 114 mm). For example, in the case where the roll weight (excluding the core portion) per 114 mm of roll width is 152 g, the roll diameter Ll = 115 mm, and the paper tube outer diameter L3 = 38 mm, the roll density is 152 g ÷ [{3.14 x (115 mm ÷ 2 ÷ 10) 2 - 3.14 x (38 mm ÷ 2 ÷ 10) 2} x (114 mm ÷ 10)] = 0.14 g / cm 3 .

[0040] The roll winding density and the roll density become an index of how densely and how hard or loosely the roll of toilet paper is wound. Moreover, if it is too loose, the paper tube is easily deformed, and if it is too hard, the toilet paper feels hard when held in the hand.

[0041] Further, the roll of toilet paper of the present embodiment preferably has the roll winding density and the roll density described above, and the roll compression ratio is preferably 0.66 to 1.50.

[0042] The roll compression ratio is represented by (cross-sectional area calculated based on the paper thickness) / (cross-sectional area of the roll). The method of calculating the (cross-sectional area of the roll) is the same as the (cross-sectional area of the roll) in the roll winding density described above. In addition, the (cross-sectional area calculated based on the paper thickness) is a value calculated by (paper thickness) x (winding length). This value of the (cross-sectional area calculated based on the paper thickness) does not take into account the gap when the toilet paper is wound around the paper tube. On the other hand, the value of the (cross-sectional area of the roll) takes into account the gap when the toilet paper is wound around the paper tube. Therefore, the roll compression ratio represented by the ratio of the (cross-sectional area calculated based on the paper thickness) to the (cross-sectional area of the roll) also becomes an index of how hard or loosely the roll of toilet paper is wound. Moreover, as described above, if it is too loose, the paper tube is easily deformed, and if it is too hard, the toilet paper feels hard when held in the hand. In addition, the roll winding density is easily affected by the number of layers, and the roll compression ratio is easily affected by the paper thickness.

[0043] Here, the feeling of hardness when the roll of toilet paper is held in the hand is not only affected by the density, but also by the collapse of the concave portions due to the toilet paper being stretched and wound, the physical properties of the toilet paper, and the characteristics of the surface, and therefore, in the roll of toilet paper of the present embodiment, further preferred structures of the toilet paper are described.

[0044] The preferred toilet paper is a 2-layer toilet paper having concave portions based on embossing processing. In addition, the weight per 1 layer of the toilet paper per square meter is preferably 13.0 to 17.0 g / m 2 , more preferably 13.5 to 16.0 g / m 2 , and the thickness of the 2 layers is preferably 175 to 238 μm, more preferably 180 to 225 μm. If the weight per square meter and the paper thickness are within this range, in particular, the wiping properties and the water absorption properties against skin with moisture attached, and the sense of security when wiping can be sufficiently improved, and further, the skin touch feeling of the roll surface when the winding length is extended can be improved.

[0045] Note that the measurement method of the weight per square meter (basis weight) is the method prescribed in JIS P 8124. In addition, the measurement method of the paper thickness is as follows: after a test piece is sufficiently conditioned (typically for about 8 hours) under the conditions of JIS P 8111 (1998), 2 layers are directly measured using a dial gauge thickness meter (thickness measuring device) "PEACOCK H type" (manufactured by Ozaki Mfg. Co., Ltd.) under the same conditions. Specifically, after confirming that there is no garbage, dust, or the like between the plunger and the measurement table, the plunger is lowered onto the measurement table, the scale of the dial gauge thickness meter is moved to align with zero, then the plunger is raised and the test piece is placed on the test table, the rod is lowered all at once from a state in which the plunger is opened to 700 μm, and the gauge at that time is read. During measurement, only the plunger is placed without being pressed. The circular plane of the plunger with a diameter of 10 mm is brought into abutment with the paper plane perpendicularly, and the load at the time of the paper thickness measurement is about 70 gf. Note that the paper thickness is the average value obtained by measuring 10 times.

[0046] In this embodiment, the first sheet in the sanitary paper can have a first recess and a second recess having different depths formed by embossing. It can be that the first recess and the second recess of the first sheet are formed on the same face, and the other face is formed with a convex portion corresponding to the first recess and the second recess. Either of the first sheet and the second sheet can be located on the outer side with respect to the paper tube, but the first sheet can be located on the outer side. In particular, the recess face can be located on the outer side.

[0047] In addition, with respect to the sanitary paper, it can be that the first recess of the first sheet is adhered to the second sheet on the laminated inner face side to become 2 layers. With respect to the adhesion, it can be adhered to the laminated inner face side of the second sheet by means of an adhesive given to the convex portion of the first sheet corresponding to the recess. In addition, it can be integrated by being crimped by embossing called so-called single-sided embossing. Further, it can be that, regardless of whether or not an adhesive is used, and regardless of whether or not it is single-sided embossing, as the first sheet and the second sheet are laminated and integrated, only the convex portion corresponding to the first recess of the first sheet, or to both the first recess and the second recess, is formed on the outer face of the second sheet. On the other hand, the laminated inner face side of the second recess can not be adhered to the second sheet by an adhesive. It is not necessary that all of the laminated inner face sides of the first recess are adhered to the second sheet, but from the viewpoint of peeling, it is preferable that all of the recesses are adhered.

[0048] In the case of using an adhesive, it can be any of a water-based adhesive and an oil-based adhesive. However, a preferable adhesive is a water-soluble adhesive such as PVA (polyvinyl alcohol) and CMC (carboxymethyl cellulose). CMC, which is a cellulose-based water-soluble adhesive, is particularly preferable.

[0049] In addition, the adhesive itself can be an ink having adhesiveness, or a coloring component such as a pigment or a dye can be added to the adhesive. In this case, the first recess portion is colored and is visually recognized, and is excellent in design. As a preferable coloring component, an aqueous dye such as a phthalocyanine dye, an azo-based metal complex salt dye, or the like can be exemplified. As a pigment, aluminum hydroxide, kaolin, talc, calcium carbonate, titanium dioxide, clay, zinc oxide, or the like can be exemplified.

[0050] The planar shape of each of the first recess portion and the second recess portion is not limited. In particular, the first recess portion can be determined in consideration of design and the like. The area of each of the first recess portion and the second recess portion is also not necessarily limited. A plurality of recess portions having different areas can also be provided. However, in the case of a roll of toilet paper wound in a long size, as a range in which the effect of providing the roll of toilet paper according to the present application is particularly easily exerted, the preferable area of the first recess portion is 1.00 to 22.0 mm 2 , and the more preferable area is 1.50 to 21.5 mm 2 . The roll of toilet paper is particularly excellent in the wiping property and the water absorption property with respect to a skin to which moisture is attached, and the sense of security at the time of wiping, and is fully sufficient in the hand feeling such as softness, fluffiness, smoothness, and the like, and further has a hardness with which the roll is firmly formed, and is excellent in the tactile sensation of the surface of the roll. The preferable area of the second recess portion is 0.25 to 0.75 mm 2 , and the more preferable area is 0.30 to 0.50 mm 2 . Furthermore, the embossing density of the first recess portion and the second recess portion is also not limited, but as a range in which the effect of the present application described above is particularly easily exerted, the preferable embossing density of the first recess portion is 4 to 14 pieces / cm 2 , and the more preferable embossing density is 7 to 11 pieces / cm 2 . The preferable embossing density of the second recess portion is 2 to 11 pieces / cm 2 , and the more preferable embossing density is 5 to 8 pieces / cm 2 . Note that the embossing density is a value measured by selecting 50 cm from the winding end side excluding the tail seal portion.

[0051] On the other hand, with respect to the toilet paper of the present embodiment, the depth of the first recess portion is preferably 0.17 to 0.23 mm. The depth of the second recess portion is preferably 0.050 to 0.090 mm. When the depths of the first recess portion and the second recess portion are in this range, in combination with the characteristics of the roll density and the roll winding density described above, in particular, the hand feeling of the toilet paper and the hand feeling of the surface of the roll are improved and become more favorable.

[0052] The depth of the first recess and the second recess is a value measured by One shot 3D measuring microscope VR-3200 manufactured by KEYENCE Corporation or an equivalent device, and image analysis software "VR-H1A" or an equivalent software. The measurement is performed under the conditions that the magnification is 12 times and the field area is 24 mm x 18 mm. However, the magnification and the field area can be appropriately changed depending on the size of the embossing (recess). Referring to Figure 2 The specific measurement procedure is described below. Using the above software, the embossing depth (measurement cross-sectional curve) profile on a line segment Q1 that crosses the longest portion of the periphery of one recess 40 in the image portion (X portion in the figure) represented by the planar viewpoint is obtained. In the "profile curve Q2" of the image portion (Y portion in the figure) represented by the cross-sectional viewpoint obtained by removing the components of the surface roughness of a wavelength shorter than λc: 800 μm (where λc is a "filter that defines the boundary between the roughness component and the waviness component" described in JIS-B 0601 "3.1.1.2") from the cross-sectional curve of the embossing depth profile, the two recess edge points P1, P2 that protrude upward the most strongly curved and the minimum value sandwiched by the recess edge points P1, P2 are found as the minimum value Min of the depth. Further, the average of the values of the depths of the recess edge points P1, P2 is taken as the maximum value Max of the depth. In this way, the embossing depth = maximum value Max - minimum value Min. In addition, the distance (length) on the X-Y plane of the recess edge points P1, P2 is defined as the length of the longest portion. The above two recess edge points P1, P2 that protrude upward the most strongly curved are selected by visual inspection. Furthermore, at the time of the selection, the profile E in the image of the planar viewpoint of the recess 40 in the measurement can also be referred to. Similarly, the depth of the recess is also measured for the shortest portion in the direction perpendicular to the longest portion, and the larger value is taken as the depth of the recess. The above measurement is performed for any 10 embossings on the surface of the sanitary paper, and the average thereof is taken as the final embossing depth.

[0053] In addition, as for the area of the recess of each of the first recess and the second recess, the profile of the embossing recess is visually confirmed from the 3D image obtained by the one shot 3D measuring microscope VR-3200 or an equivalent device, and the image analysis software "VR-H1A" or an equivalent software, and the area inside the profile is measured. The above operation is performed for any 10 embossings on the surface of the sanitary paper, and the average thereof is taken as the final area of the embossing recess.

[0054] Further, the sanitary paper of the present embodiment is preferably such that the MMD of the laminated outer surface of the first sheet on which the first recess and the second recess are formed is 10.0 or less. If the skin touch feeling due to the recess is considered, the value of the MMD is more preferably 8.0 to 10.0. As for the MMD, the one shot 3D measuring microscope VR-3200 manufactured by KEYENCE Corporation or an equivalent device, and the image analysis software "VR-H1A" or an equivalent software are used.Figure 3 The measurement device 100 shown, while making the contact surface of the friction member contact the surface of the measurement sample to which a tension of 20 g / cm is applied in a prescribed direction with a contact pressure of 25 g, moves the contact surface of the friction member at a speed of 0.1 cm / s for 2 cm in substantially the same direction as the direction to which the tension is applied, and measures the coefficient of friction at that time using a frictional sensation tester KES-SE (manufactured by Kato Tech Co., Ltd.) or an equivalent instrument. The value obtained by dividing the coefficient of friction by the friction distance (moving distance = 2 cm) is the MMD. The friction member is formed by 20 piano wires P each having a diameter of 0.5 mm, and has a contact surface that is 10 mm in length and 10 mm in width. Unit protruding portions formed of 20 piano wires P (curvature radius: 0.25 mm) are formed at the ends of the contact surface.

[0055] Further, in the toilet paper, it is also preferable that the second sheet has a recess formed by embossing or the like. By forming the recess based on embossing in the second sheet, the difference in extension between the first sheet having the recess and the protrusion is reduced, and generation of wrinkles or paper breakage during manufacture can be prevented. In addition, it is easy to make the toilet paper have a good balance between the quality such as softness and thickness, and it is easier to exert the effects of the present application. However, the area of the recess in the second sheet is preferably smaller than the first recess in the first sheet, and is the same degree as the second recess. In addition, the embossing density is preferably denser than the second recess in the first sheet. Specifically, the preferable area of the recess in the second sheet is 0.25 to 0.75 mm 2 , and the more preferable area is 0.30 to 0.50 mm 2 . Further, the preferable embossing density of the recess in the second sheet is 2 to 12 pieces / cm 2 , and the more preferable embossing density is 2 to 11 pieces / cm 2 , and the more preferable embossing density is 4 to 8 pieces / cm 2 .

[0056] Further, the softness of the toilet paper is preferably 1.8 to 2.7 cN / 100 mm, and more preferably 2.0 to 2.6 cN / 100 mm. The softness is measured based on the hand measuring meter method according to JIS L 1096 (2010) E method.

[0057] In the toilet paper of the present embodiment, when the MMD and the softness are in the above-described ranges, particularly in combination with the characteristics of the roll density and the roll winding density, particularly the hand feeling and the hand feeling of the roll surface are improved and become good.

[0058] On the other hand, the sanitary paper of the present embodiment is preferably such that 55% or more, preferably 60% or more and 70% or less of the fibers constituting the paper are pulp from broad-leaved trees. The fibers of the pulp from broad-leaved trees are short in length, and it is easy to make the texture of the paper surface good. The roll sanitary paper of the present embodiment is long in winding length and is easy to feel hard, but by providing 55% or more of the pulp from broad-leaved trees, the smoothness is improved, and it is easy to make the hardness less noticeable. In addition, the hand feeling at the time of use is also improved. In addition, as the pulp from broad-leaved trees, LBKP (broad-leaved tree kraft pulp), LUKP, LOKP, and the like are known, but LBKP after bleaching treatment is preferable. Note that, as the fibers other than the pulp from broad-leaved trees, pulp from coniferous trees is preferable. In this case, NBKP (coniferous tree kraft pulp) after chlorine bleaching is preferable.

[0059] The sanitary paper of the present embodiment preferably contains or is subjected to a temporary wet strength agent and a dry strength agent. The dry tensile strength is improved by the dry strength agent, and it is easy to form sufficient strength and perforation line strength at the time of use. In addition, when the winding length is wound on the paper tube long, it is difficult to break the paper even if the winding tension at the time of manufacture is increased. Furthermore, when the dry tensile strength is increased, the water absorption is also improved. On the other hand, if only the dry strength agent is used to increase the dry tensile strength, the hydrolyzability is reduced, and in addition, the paper becomes hard, and the hand feeling and the use feeling are easy to reduce. The temporary wet strength agent does not hydrolyze due to short-term contact with moisture at the time of wiping, has sufficient hydrolyzability with respect to a sufficient amount of moisture accumulated in the storage water pipe in the water closet, and the paper force is slightly reduced compared to when only the dry strength agent is used, and the hand feeling is good. Therefore, by including the temporary wet strength agent together with the dry strength agent, the hand feeling as the sanitary paper is better, and in particular, when wiping the skin to which moisture adheres after using the shower toilet, sufficient strength is obtained, high moisture absorption with a sense of security is obtained, and it is easy to become a sanitary paper in which moisture is difficult to penetrate to the hand.

[0060] The content of the temporary wet strength agent is not limited, but is preferably 0.01 to 0.04% by mass. The temporary wet strength agent is preferably internally added at the time of manufacture. The type of the temporary wet strength agent is not limited, and examples include polyacrylamide resin, polyamide polyamine epichlorohydrin resin, urea resin, acid colloid · melamine resin, heat-crosslinking coating PAM, TS-20, TS4070 manufactured by Hoshuko PMC Corporation, glyoxylated polyacrylamide, cationic glyoxylated polyacrylamide, and the like polymer aldehyde-functional compound, a copolymer of an acrylamide monomer modified with a divalent aldehyde of glyoxal and other copolymerizable unsaturated monomers, or a dialdehyde starch.

[0061] The content of the dry strength agent is not limited, but is preferably 0.005 to 0.15 mass%. The dry strength agent is preferably internally added. The type of the dry strength agent is not limited, and examples include polyacrylamide, CMC (carboxymethyl cellulose) or carboxymethyl cellulose sodium, carboxymethyl cellulose calcium, carboxymethyl cellulose zinc as a salt thereof. However, starch and cationized starch are not preferred because they make the surface of the toilet paper easily hard and hard-feeling.

[0062] A particularly preferred dry strength agent is an enzyme-based paper strength agent. The enzyme-based paper strength agent is particularly suitable for use in the toilet paper of the present embodiment. Unlike a paper strength agent such as starch, which functions like an adhesive to impart strength, the enzyme-based paper strength agent functions in such a way as to contain an enzyme for decomposing polysaccharides, to further fibrillate the fibers, and to roughen the fiber surface or the fiber interior. Thus, by causing the enzyme-based paper strength agent to function, the hydrogen bonding is not hindered, and only the proportion of cellulose fibers is increased, so the entanglement interaction with the fibers with each other, particularly the surface, is increased, and the paper strength is improved. Furthermore, in the enzyme-based paper strength agent, the paper strength is improved as such, but the hydrolyzability is not hindered. Thus, the hand of the toilet paper is improved, and furthermore, particularly, even if the winding length side length, the roll density, or the roll winding density is increased, the hand of the roll surface is very excellent, and the water absorbency is also excellent. Note that whether or not the enzyme-based paper strength agent functions on the fibers can be confirmed by high-performance liquid chromatography (HPLC), mass spectrometry (LC / MS), or the like, with respect to the enzyme-based paper strength agent in the toilet paper.

[0063] Here, as the enzyme-based paper strength agent of the present application, for example, a paper strength agent containing at least one of cellulase, hemicellulase, and xylanase can be given. As a paper strength agent containing such an enzyme, HERCOBOND 8922 (manufactured by Riken Green Co., Ltd.), HERCOBOND EZ 4423 (manufactured by Riken Green Co., Ltd.), "Cellulosin T2" manufactured by HPI Co., "Meicase (registered trademark)" manufactured by Meiji Seika Pharma Co., "Novozyme (registered trademark) 188", "Cellclast", "Marutifect CX10L, B, GCc, GC, cutinase (hemicellulase)", "Spezyme CP", "GC 220", and the like manufactured by Novozyme Co., Genencore Co. can be given. The amount of addition is not limited, but is preferably 0.5 to 2.0 kg / t.

[0064] The dry tensile strength of the toilet paper of the present embodiment is not limited, but the dry tensile strength in the longitudinal direction is 400 cN / 25 mm or more and 600 cN / 25 mm or less, preferably 450 cN / 25 mm or more and 580 cN / 25 mm or less, and the dry tensile strength in the transverse direction is 100 cN / 25 mm or more and 200 cN / 25 mm or less, preferably 135 cN / 25 mm or more and 180 cN / 25 mm or less. Here, the longitudinal direction of the paper is also referred to as the MD direction, and is the flow direction at the time of papermaking. The transverse direction of the paper is also referred to as the CD direction, and is the direction orthogonal to the flow direction (MD direction) at the time of papermaking. In addition, the dry tensile strength of the present application is a value measured based on JIS P 8113 (2006), and is measured as follows. As for the test piece, a test piece cut to 25 mm (±0.5 mm) in width x about 150 mm in length in the longitudinal direction and the transverse direction is used. The measurement is directly performed on the multi-layer test piece. As the testing machine, a load cell tensile testing machine TG-200N manufactured by Minebea Co., Ltd. or the like is used. In addition, the jig interval is set to 100 mm, and the tensile speed is set to 100 mm / min. The measurement is performed in the following order: the both ends of the test piece are fastened to the jigs of the testing machine, a tensile load is applied to the paper piece in the up-down direction, and the indicated value (digital value) at the time of paper breakage is read. Five sets of test pieces are prepared in the longitudinal direction and the transverse direction, respectively, and each is measured five times, and the average of the measured values is taken as the dry tensile strength in each direction.

[0065] In addition, with respect to the toilet paper of the present embodiment, the wet tensile strength in the longitudinal direction is 20 cN / 25 mm or more and 60 cN / 25 mm or less, preferably 30 cN / 25 mm or more and 55 cN / 25 mm or less, and the wet tensile strength in the transverse direction is 10 cN / 25 mm or more and 30 cN / 25 mm or less. The wet tensile strength is a value measured based on JIS P 8135 (1998), and is measured as follows. As for the test piece, a test piece cut to 25 mm (±0.5 mm) in width x about 150 mm in length in the longitudinal direction and the transverse direction is used. In the case where the toilet paper is multi-layered, the measurement is directly performed in the multi-layered state. As the testing machine, a load cell tensile testing machine TG-200N manufactured by Minebea Co., Ltd. or the like is used. In addition, the jig interval is set to 100 mm, and the tensile speed is set to 50 mm / min. The test piece is a test piece solidified by a dryer at 105°C for 10 minutes. The measurement is performed in the following order: after the both ends of the test piece are fastened to the jigs of the testing machine, a flat pen containing water is used to horizontally apply water to the central portion of the test piece at a width of about 10 mm, and then, immediately, a tensile load is applied to the paper piece in the up-down direction, and the indicated value (digital value) at the time of paper breakage is read. Five sets of test pieces are prepared in the longitudinal direction and the transverse direction, respectively, and each is measured five times, and the average of the measured values is taken as the wet tensile strength in each direction.

[0066] On the other hand, the hydrolysis of the toilet paper of the present embodiment is preferably 60 seconds or less, more preferably 45 seconds or less and 20 seconds or more. If the hydrolysis is 60 seconds or less, the possibility of causing a pipe blockage at the time of flushing and discarding in a toilet bowl or the like is small. In addition, if it is 20 seconds or more, even when a large amount of moisture is wiped after using a shower toilet, the possibility of the fiber immediately unraveling and breaking is small. The measurement of this hydrolysis (ease of loosening) is based on JIS P 4501 (1993). In the test of the ease of loosening, a 300 mL beaker containing 300 mL of water (water temperature: 20 ± 5°C) is placed on a magnetic stirrer, and the rotation speed of the rotor is adjusted to 600 ± 10 rpm. A test piece of 100 ± 2 mm square on one side is dropped thereinto, and a stopwatch is pressed. The rotation speed of the rotor temporarily decreases to about 500 rpm due to the resistance of the test piece, and as the test piece becomes loose, the rotation speed increases. At the time when the rotation speed returns to 540 rpm, the stopwatch is stopped, and the time is measured in units of 1 second. For the result of the ease of loosening, 5 tests are performed, and the average thereof is indicated. The rotor is a disc shape having a diameter of 35 mm and a thickness of 12 mm.

[0067] On the other hand, with respect to the toilet paper of the present embodiment, the number of sheets of penetration is preferably 9 sheets or more. With respect to the measurement of the number of sheets of penetration, a plurality of toilet papers are overlapped only by the weight, 100 μL of water is dropped from a position 10 mm above the uppermost position of the toilet paper, and immediately after the dropping, penetration to the lowermost layer is confirmed. From a small number of stacked sheets to a point where penetration cannot be confirmed, the number of stacked sheets is increased, and the maximum number of sheets in which penetration can be confirmed is measured. If it exceeds 9 sheets, it can be said that the toilet paper is one in which moisture can penetrate extremely quickly.

[0068] Further, the toilet paper of the present embodiment is preferably provided with a perforation line at a prescribed interval in the length direction. The interval of the perforation line is not limited, and can be set to 100 to 120 mm. The perforation line strength is preferably 580 to 700 cN / 114 mm. Note that the measurement of the perforation line strength is performed in accordance with the measurement of the dry tensile strength based on JIS P 8113 (2006). Here, with respect to the measurement sample, a toilet paper having a length of 200 mm and a width of the entire width of the product shape with the perforation line in the center of the length direction is selected. In addition, in the measurement, the width is folded in half or four times along the length direction (equivalent to the MD direction axis) so as to be gripped in the chucks of a tensile testing machine, the gripping interval is set to 100 mm, and the measurement is performed at a tensile speed of 100 mm / minute. This measurement is performed 5 times, the width is converted to 114 mm, and the average value is used as the perforation line strength. Note that the testing machine can use a load cell tensile testing machine TG-200N manufactured by Minebea Co., Ltd. and the like.

[0069] Example

[0070] Further, for the embodiments and comparative examples of the toilet paper roll of the present application, the hydrolysis, the penetration number, and the like were measured, and further, the "firmness of the roll (hardness of the roll)", the "skin touch of the roll surface", the "frequency of replacement of the roll per day", the "thickness of the toilet paper (sense of security at use)", the "softness of the toilet paper", the "fluffiness of the toilet paper", the "smoothness of the toilet paper", and the "wiping sense of the toilet paper" were subjected to a sensory evaluation test. In the sensory evaluation test, 20 subjects actually used the toilet paper roll, and each item was evaluated. In addition, Comparative Example 1 which was a conventional 2-layered normal product was used as a reference sample. The evaluation was set to 7 grades, the reference sample was set to 4 points, and in order to compare, the scoring was performed in a manner that particularly good = 7 points, good = 6 points, slightly good = 5 points, 3 points = slightly bad, 2 points = bad, and 1 point = particularly bad, and the average value was calculated. Note that, regarding the "firmness of the roll (hardness of the roll)", a case where it is harder than the reference sample was set to a high score, and a case where it is softer than the reference sample was set to a low score.

[0071] Note that, the embodiments and comparative examples used toilet paper made by laminating a first sheet having a first recess and a second recess on the same face, and a second sheet, in a manner that the formed faces of the first recess and the second recess become the outer side, thereby making 2 layers. In addition, the second sheet was formed with a recess having the same shape and depth as the second recess of the first sheet. The shapes of the first recess and the second recess in Embodiments 1 to 7, Comparative Example 1, and Comparative Examples 4 to 7 were the same, and in addition, the shapes of the first recess and the second recess of Comparative Example 2 and Comparative Example 3 were the same.

[0072] A paper strength agent was used in each example. In Embodiments 1 to 7 and Comparative Examples 4 to 7, an enzyme-based paper strength agent (HERCOBOND 8922 (Shin-ken Green Co., Ltd.)) was used as a dry strength agent. In addition, a temporary paper strength agent (TS4070 Star PMC Co., Ltd.) was used. Comparative Example 1 used a cationized starch (DD4280 Star PMC Co., Ltd.) as a dry strength agent. In addition, a temporary paper strength agent (TS4070 Star PMC Co., Ltd.) was used.

[0073] The physical properties and the composition of the other embodiments and comparative examples are shown in Table 1 below. In addition, the measurement methods are as described above.

[0074] [Table 1]

[0075]

[0076] As the results shown in Table 1, the "firmness of the roll (hardness of the roll)" has a tendency to become higher as the winding length becomes longer. The winding length of the examples of the present application is longer than that of Comparative Examples 1 to 3, and the roll was evaluated as firm and having hardness. However, despite this, the evaluation of the skin touch feeling of the roll surface was higher than that of Comparative Examples 1 to 3.

[0077] Further, in all of the items relating to the feel of the toilet paper, "thickness feeling of the toilet paper (sense of security at use)", "softness of the toilet paper", "fluffiness of the toilet paper", "smoothness of the toilet paper", and "wiping feeling of the toilet paper", more excellent results were obtained as compared with Comparative Examples 1 to 3 in which the winding length was short and the roll was loosely wound.

[0078] Further, from the observation of Comparative Examples 4 to 7, a tendency that the evaluation was slightly lower than that of Examples 1 to 7 of the present application was observed.

[0079] That is, in the examples of the present application, the toilet paper becomes a roll toilet paper in which the wiping property and water absorption property against the skin to which moisture is attached are high, the sense of security at wiping is excellent, and the feel such as softness, fluffiness, and smoothness is sufficient, and further the roll has firm hardness and the touch feeling of the roll surface is excellent.

[0080] Explanation of Reference Numerals

[0081] 1: roll toilet paper; 10: toilet paper; 20: paper tube (core); L1: winding diameter (diameter) of the roll toilet paper; L3: diameter of the core of the roll toilet paper; L2: width of the roll toilet paper.

Claims

1. A type of toilet paper roll, comprising two layers of toilet paper wound around a paper tube, characterized in that, Regarding the aforementioned toilet paper rolls, the roll diameter is less than 120mm, the winding length is 34.5m to 50m, and the roll winding density is 0.74m / cm². 2 ~1.30m / cm 2 The density of the roll is 0.12 g / cm³. 3 ~0.18g / cm 3 , The weight of each layer of the toilet paper is 13.5g / m². 2 Above and below 16.0 g / m 2 The thickness of the two layers is 180μm to 225μm. The toilet paper is made by laminating a first sheet and a second sheet, wherein the first sheet has a first recess and a second recess of different depths formed by embossing. The first recess has a diameter of 1.00 mm. 2 ~22.0mm 2 area, The second recess has a diameter of 0.25 mm. 2 ~0.75mm 2 area, The embossing density of the first recess is 4 pieces / cm 2 ~14 per cm 2 The embossing density of the second recess is 2 pieces / cm². 2 ~11 per cm 2 , The first recess is bonded to the second sheet on the inner surface side of the laminate, and the inner surface side of the second recess is not bonded to the second sheet.

2. The toilet paper roll according to claim 1, wherein, The roll compression rate of the toilet paper roll is 0.66 to 1.

50.

3. The toilet paper roll according to claim 1 or 2, wherein, The second sheet has a recess formed by embossing, the depth of which is shallower than the depth of the first recess formed on the first sheet.

4. The toilet paper roll according to claim 1 or 2, wherein, Toilet paper is toilet paper that has been treated with enzyme-based paper strengthening agents.

5. The toilet paper roll according to claim 1 or 2, wherein, Toilet paper does not contain starch or cationic starch.

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