Roller toilet paper

Abstract

This invention provides a roll of toilet paper suitable for use in toilets with washing functions and easily available in longer sizes. The problem of this invention is solved by a roll of toilet paper consisting of two layers of toilet paper wound around a paper tube. The two layers are formed by bonding two sheets together via recesses created through an embossing process. The roll diameter is less than 120 mm, and the roll compression ratio is 0.66 to 1.50. The toilet paper is formed by stacking a first sheet and a second sheet, the first sheet having a first recess and a second recess of different depths created through an embossing process.

Description

Technical Field

[0001] This invention relates to toilet paper rolls. Background Technology

[0002] With the increasing popularity of toilets with washing functions, toilet paper is required to be suitable for use in toilets with washing functions.

[0003] In toilets with a washing function, in order to clean the defecation and urination areas with warm water or water, it is necessary to wipe away feces, urine and moisture that has adhered to the skin due to washing.

[0004] Therefore, toilet paper requires excellent wiping properties for skin with high moisture content, high absorbency, and a sense of security during wiping. Lamination and embossing technology is known as a technique for improving wiping properties for skin with moisture. Lamination and embossing is a technique that uses adhesive glue to laminate embossed layers, thereby improving strength, thickness, and water-resistance.

[0005] On the other hand, toilet paper is usually sold in the market in the form of rolls of toilet paper wound around a paper tube. Moreover, in recent years, there has been a continuous trend towards longer rolls of toilet paper, which increase the length of the paper tube.

[0006] Existing technical documents

[0007] Patent documents

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

[0009] Patent Document 2: Japanese Patent Application Publication No. 2019-10366 Summary of the Invention

[0010] The problem that the invention aims to solve

[0011] However, the paper thickness of toilet paper made by lamination and embossing technology becomes too thick, making it unsuitable for direct long-size production.

[0012] On the other hand, if the basis weight of each layer is reduced in order to achieve a longer size, the feel such as softness, fluffiness, and smoothness is easily reduced. In particular, if the basis weight is reduced in toilet paper that uses lamination and embossing technology, a hard feeling caused by the adhesive paste is easily felt.

[0013] Consequently, the surface texture of the toilet paper roll deteriorates during manufacturing, giving users a more gritty impression.

[0014] Therefore, the main objective of this invention is to provide toilet paper rolls that are highly absorbent and easy to wipe against moist skin, provide excellent comfort when wiping, are suitable for long-sized toilet paper rolls with good softness, fluffiness, and smoothness, and have a strong rigidity and long length, and have an excellent tactile feel on the roll surface.

[0015] Methods for solving problems

[0016] The first solution to the above problem is a type of toilet paper roll, which is made by winding two layers of toilet paper onto a paper tube. The two layers of toilet paper are formed by bonding two sheets together through recesses created by an embossing process.

[0017] Its features are,

[0018] Regarding the aforementioned toilet paper rolls, the roll diameter is less than 120mm, and the roll compression rate is 0.66 to 1.50.

[0019] Toilet paper is made by laminating a first sheet and a second sheet, the first sheet having a first recess and a second recess of different depths formed by embossing.

[0020] The second method is the toilet paper roll of the first method mentioned above, wherein the depth of the first recess is 0.17 to 0.23 mm.

[0021] The third method is a roll of toilet paper using the first or second method described above, wherein the depth of the second recess is 0.050 to 0.090 mm.

[0022] The fourth method is the toilet paper roll of the first to third methods mentioned above, 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.

[0023] The fifth method is the toilet paper roll produced by the first to fourth methods mentioned above, wherein the roll winding density is 0.74 m / cm². 2 ~1.30m / cm 2 The density of the roll is 0.12 g / cm³. 3 ~0.18g / cm 3 .

[0024] The sixth method is the toilet paper roll of the first to fifth methods mentioned above, wherein the toilet paper is toilet paper treated with an enzyme-based paper-strengthening agent.

[0025] The seventh method is the toilet paper rolls of the first to sixth methods mentioned above, wherein the toilet paper does not contain starch or cationic starch.

[0026] The effects of the invention

[0027] 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

[0028] Figure 1 This is a perspective view of a toilet paper roll according to an embodiment of the present invention.

[0029] Figure 2 This is a schematic diagram illustrating the steps for measuring the embossing depth according to the present invention.

[0030] Figure 3 This is a schematic diagram illustrating the measurement method of MMD according to the present invention. Detailed Implementation

[0031] Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0032] 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.

[0033] 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.

[0034] On the other hand, the roll diameter L1 of the toilet paper in this embodiment is 120 mm or less, preferably 107 to 119 mm. The roll diameter L1 of the toilet paper is specified as 120 mm or less in JIS P 4501, and the support for setting up a general toilet paper roll is manufactured based on this 120 mm. The roll diameter of the toilet paper in this embodiment is 120 mm or less, and it can be set up in a general support. Here, the roll diameter L1 is a value measured using a diameter measuring ruler manufactured by Mura Tech KDS Co., Ltd. or an equivalent device. The measured value is the average of three measurements taken at different positions in the width direction. It should be noted that the average value in the same manufacturing batch is the average of five rolls. Furthermore, the roll width L2 of the toilet paper in this embodiment is not limited, but is preferably 100 to 130 mm. Additionally, the outer diameter L3 of the paper tube is not limited, and is...

[0035] Here, the toilet paper roll of this embodiment is characterized by a roll compression ratio of 0.66 to 1.50. The roll compression ratio is expressed as (cross-sectional area calculated based on paper thickness) / (cross-sectional area of ​​the roll). The cross-sectional area of ​​the roll is expressed as {cross-sectional area of ​​the roll diameter (outer diameter) L1 portion} - (cross-sectional area of ​​the paper tube outer diameter L3 portion). Furthermore, the (cross-sectional area calculated based on paper thickness) is a value calculated by (paper thickness) × (winding length). This value of (cross-sectional area calculated based on paper thickness) does not take into account the gaps when the toilet paper is wound onto the paper tube. On the other hand, the value of (cross-sectional area of ​​the roll) takes into account the gaps when the toilet paper is wound onto the paper tube. Therefore, the roll compression ratio, expressed as the ratio of (cross-sectional area calculated based on paper thickness) to (cross-sectional area of ​​the roll), becomes an indicator of how stiffly or loosely the toilet paper is wound in the roll. Furthermore, if it is too loose, it is easy to become excessively deformed, such as paper flying out from near the tube. In addition, if it is too stiff, it will give a stiff impression when holding the toilet paper roll.

[0036] Furthermore, regarding the toilet paper roll of this embodiment, it is preferable to have the aforementioned roll compression ratio and a roll winding density of 0.74 to 1.30 m / cm². 2 The density of the roll is 0.12–0.18 g / cm³. 3 .

[0037] The winding density of the roll is expressed as (winding length × number of layers) ÷ (cross-sectional area of ​​the roll). The cross-sectional area of ​​the roll is expressed as {cross-sectional area of ​​the roll diameter (outer diameter) L1 portion} - (cross-sectional area of ​​the paper tube outer diameter L3 portion). Therefore, for example, with a winding length of 46m, 2 layers, a roll diameter L1 = 115mm, and a paper tube outer diameter L3 = 38mm, the winding density is (46m × 2) ÷ {3.14 × (115mm ÷ 2 ÷ 10)} 2-3.14×(38mm÷2÷10) 2}=0.99m / cm 2 .

[0038] Additionally, roll density is expressed as (roll mass) ÷ (roll volume). Roll mass is the mass of toilet paper per 114mm roll width. Roll volume is expressed as [{cross-sectional area of ​​the roll diameter L1 portion} - (cross-sectional area of ​​the paper tube outer diameter L3 portion)] × roll width (converted to per 114mm). For example, if the roll weight (excluding the core) per 114mm roll width is 152g, the roll diameter L1 = 115mm, and the paper tube outer diameter L3 = 38mm, the roll density is 152g ÷ [{3.14 × (115mm ÷ 2 ÷ 10)]. 2 -3.14×(38mm÷2÷10) 2 [×(114mm÷10)]=0.14g / cm 3 .

[0039] Roll winding density and roll density serve as indicators of the degree of compactness and rigidity or looseness of the winding in toilet paper rolls. If the roll is too loose, it is prone to excessive deformation, such as paper flying out near the tube. Conversely, if it is too rigid, the toilet paper roll will feel stiff to the touch. Furthermore, roll winding density is easily affected by the number of layers, and roll compression ratio is easily affected by paper thickness.

[0040] Here, the impression of the hardness of the toilet paper roll when held in the hand is affected not only by its density, but also by the crushing of the concave areas caused by the toilet paper being stretched and rolled, as well as the physical properties and surface characteristics of the toilet paper. Therefore, in the toilet paper roll of this embodiment, a more preferred structure of the toilet paper will be further described.

[0041] The preferred weight per square meter of each layer of this toilet paper is 13.0–17.0 g / m². 2 More preferably, it is 13.5–16.0 g / m 2 The thickness of the two layers is preferably 175–238 μm, more preferably 180–225 μm. Within this range of weight per square meter and paper thickness, it is particularly effective in significantly improving the wipeability and absorbency against moist skin, as well as the sense of security during wiping, thereby improving the skin feel of the roll surface when the winding length is extended.

[0042] It should be noted that the method for measuring weight per square meter (basic weight) is based on the method specified in JIS P 8124. The method for measuring paper thickness is as follows: After the test piece is fully conditioned (usually for about 8 hours) under the conditions specified in JIS P 8111 (1998), two layers are directly measured under the same conditions using a dial-type thickness gauge (thickness measuring instrument) "PEACOCK H type" (manufactured by Ozaki Corporation). Specifically, after confirming that there is no debris or dust between the plunger and the measuring stage, the plunger is lowered onto the measuring stage, and the scale of the dial-type thickness gauge is moved to zero. Then, the plunger is lifted and the sample is placed on the test stage. The lever is then lowered all at once from the state where the plunger is opened to 700 μm, and the gauge reading is taken at this point. During measurement, only the plunger is placed without pressing it. The 10 mm diameter circular flat surface of the plunger terminal is perpendicular to the paper plane, and the load during paper thickness measurement is approximately 70 gf. It should be noted that the paper thickness is the average value obtained from 10 measurements.

[0043] In this embodiment, the first sheet of toilet paper has a first recess and a second recess of different depths formed by embossing. Both the first and second recesses of the first sheet are formed on the same surface, while a corresponding protrusion is formed on the other surface. Either the first sheet or the second sheet can be located on the outer side relative to the paper tube, but the first sheet can be located on the outer side. In particular, the recessed surface can be located on the outer side.

[0044] Alternatively, regarding this toilet paper, the inner surface of the first recess of the first sheet can be bonded to the inner surface of the second sheet to form two layers. The bonding can be achieved by applying an adhesive to the protrusions of the first sheet corresponding to the recesses, thus bonding them to the inner surface of the second sheet. Alternatively, integration can be achieved through an embossing process known as single-sided embossing. Furthermore, regardless of the use of an adhesive or whether single-sided embossing is used, as the first and second sheets are integrated, only the first recess of the first sheet, or the protrusions corresponding to both the first and second recesses, can be formed on the outer surface of the second sheet. On the other hand, the inner surface of the second recess may be bonded to the second sheet without an adhesive. While it is not necessary to bond all the inner surface of the first recesses to the second sheet, from the viewpoint of layer peeling, it is preferable to bond all the recesses.

[0045] When using an adhesive, it can be either a water-based adhesive or an oil-based adhesive. However, preferred adhesives are water-soluble adhesives such as PVA (polyvinyl alcohol) and CMC (carboxymethyl cellulose). CMC, as a cellulose-based water-soluble adhesive, is particularly preferred.

[0046] Alternatively, the adhesive itself can be an adhesive ink, or coloring components such as pigments and dyes can be added to the adhesive. In this case, the first recess is colored and visually identifiable, resulting in excellent design. Preferred coloring components include water-based dyes such as phthalocyanine dyes and azo metal complex salt dyes. Pigments include aluminum hydroxide, kaolin, talc, calcium carbonate, titanium dioxide, clay, and zinc oxide.

[0047] The top view shape of the first and second recesses is not limited. In particular, the first recess can be determined considering design considerations. The area of ​​each of the first and second recesses is also not necessarily limited. Multiple recesses of different areas may also be provided. However, in the case of toilet paper rolls wound to a long dimension, the preferred area of ​​the first recess is 1.00 to 22.0 mm², as this makes it particularly easy to achieve the effects of the present invention in providing toilet paper rolls of the following type. 2 A more preferred area is 1.50–21.5 mm². 2 The toilet paper roll is characterized by: particularly, excellent wiping and absorbency for moist skin, superior comfort during wiping, and ample softness, fluffiness, and smoothness, thus possessing the rigidity to form a solid roll, and an excellent tactile feel on the roll surface. The preferred area of ​​the second recess is 0.25–0.75 mm². 2 A more preferred area is 0.30–0.50 mm. 2 Furthermore, the embossing density of the first and second recesses is not limited, but for the purpose of particularly maximizing the effects of the present invention described above, the preferred embossing density of the first recess is 4 to 14 embossings / cm². 2 A more preferred embossing density is 7–11 embossings / cm². 2 The preferred embossing density for the second recess is 2–11 embossings / cm². 2 A more preferred embossing density is 5–8 embossings / cm². 2 It should be noted that the embossing density is the value measured at a distance of 50cm from the end of the winding, excluding the tail seal.

[0048] On the other hand, regarding the toilet paper of this embodiment, the depth of the first recess is preferably 0.17 to 0.23 mm. The depth of the second recess is preferably 0.050 to 0.090 mm. When the depths of the first and second recesses are within this range, combined with the characteristics of the roll density and roll winding density described above, the feel of the toilet paper and the feel of the roll surface are improved and become better.

[0049] The depths of the first and second recesses were measured using a One Shot 3D Measuring Microscope VR-3200 or equivalent from KEYENCE Corporation, and image analysis software "VR-H1A" or equivalent. Measurements were performed at 12x magnification and a field of view of 24mm × 18mm. However, the magnification and field of view can be adjusted according to the size of the embossing (recess). (See reference...) Figure 2 The specific measurement steps are explained below. Using the aforementioned software, the embossing depth (measurement cross-sectional curve) profile on line segment Q1 is obtained, wherein line segment Q1 traverses the longest portion of the periphery of a recess 40 in the image portion (part X in the figure) represented by a planar viewpoint. From the cross-sectional curve of this embossing depth profile, a low-pass filter is used to remove surface roughness components with wavelengths shorter than λc: 800μm (where λc is the "filter defining the boundary between roughness components and waviness components" described in JIS-B 0601 "3.1.1.2"), resulting in the "profile curve Q2" of the image portion (part Y in the figure) shown by a cross-sectional viewpoint. The two recess edge points P1 and P2 with the strongest upward convex curvature, and the minimum value sandwiched between recess edge points P1 and P2, are identified as the minimum depth, Min. Furthermore, the average of the depth values ​​of recess edge points P1 and P2 is taken as the maximum depth, Max. Thus, embossing depth = maximum value Max - minimum value Min. Furthermore, the distance (length) between the concave edge points P1 and P2 in the XY plane is defined as the length of the longest portion. The two concave edge points P1 and P2, which are the most upwardly convex and curved, are selected visually. Alternatively, the contour E in the image of the concave 40 from a planar viewpoint during the measurement can also be referenced. Similarly, the depth of the concave is measured for the shortest portion in the direction perpendicular to the longest portion, and the larger value is used as the depth of the concave. The above measurements are performed on any 10 embossing patterns on the toilet paper surface, and the average value is taken as the final embossing depth.

[0050] Furthermore, the areas of the first and second recesses were visually confirmed by measuring 3D images obtained using a one-shot 3D measuring microscope VR-3200 or equivalent equipment and image analysis software "VR-H1A" or equivalent software, and the area inside the outline was measured. This process was performed on any 10 embossings on the toilet paper surface, and the average value was taken as the final area of ​​the embossed recesses.

[0051] Furthermore, the toilet paper of this embodiment is preferably characterized by a median density (MMD) of 10.0 or less on the outer surface of the laminated first sheet having the first and second recesses. Considering the skin feel provided by the recesses, a more preferable MMD value is 8.0 to 10.0. Regarding MMD, using… Figure 3 The measuring apparatus 100 shown involves contacting the contact surface of a friction element with the surface of a test specimen subjected to a tension of 20 g / cm in a specified direction using a contact pressure of 25 g. Simultaneously, the contact surface of the friction element is moved 2 cm at a speed of 0.1 cm / s in a direction approximately the same as the direction of the tension. The coefficient of friction at this point is measured using a friction tester KES-SE (manufactured by Kado Technology Co., Ltd.) or an equivalent instrument. The value MMD is obtained by dividing the coefficient of friction by the friction distance (movement distance = 2 cm). The friction element is composed of 20 adjacent piano wires P with a diameter of 0.5 mm, and has a contact surface with a length and width both forming 10 mm. A unit bulge is formed at the end of the contact surface, with each of the 20 piano wires P (with a radius of curvature of 0.25 mm).

[0052] Furthermore, in this toilet paper, the second sheet preferably also has recesses formed by embossing or the like. By forming recesses based on embossing on the second sheet, the stretch difference between it and the first sheet with recesses and protrusions is reduced, preventing wrinkles or paper breaks during manufacturing. Additionally, it is easier to produce toilet paper with a good balance of softness and thickness, thus maximizing the effects of this invention. However, the area of ​​the recesses in the second sheet is preferably smaller than the first recess in the first sheet, and to the same extent as the second recess. Furthermore, the embossing density is preferably denser than that of the second recess in the first sheet. Specifically, the preferred area of ​​the recesses in the second sheet is 0.25 to 0.75 mm². 2 A more preferred area is 0.30–0.50 mm. 2 Furthermore, the preferred embossing density of the recesses in the second sheet is 2 to 12 embossings / cm². 2 A more preferred embossing density is 2–11 embossings / cm². 2 A more preferred embossing density is 4–8 embossings / cm². 2 .

[0053] Furthermore, the softness of this toilet paper is preferably 1.8 to 2.7 cN / 100 mm, more preferably 2.0 to 2.6 cN / 100 mm. This softness is measured using a manual measuring instrument method according to JIS L 1096 (2010)E.

[0054] In the toilet paper of this embodiment, when the MMD and softness are within the above range, especially when combined with the characteristics of roll density and roll winding density, the feel and the feel of the roll surface are improved and become good.

[0055] On the other hand, the toilet paper of this embodiment is preferably composed of 55% or more, preferably 60% or more and 70% or less, of fiber from hardwood pulp. Hardwood pulp has short fiber lengths, which makes the paper surface texture better. The toilet paper roll of this embodiment has a long winding length and tends to feel stiff, but by setting the hardwood pulp to 55% or more, the smoothness is improved, making it difficult to perceive the stiffness. Furthermore, the feel during use is also improved. As for hardwood pulp, LBKP (hardwood kraft pulp), LUKP, LOKP, etc., are known, but bleached LBKP is preferred. It should be noted that, as fibers other than hardwood pulp, softwood pulp is preferred. In this case, chlorine-bleached NBKP (softwood kraft pulp) is preferred.

[0056] The toilet paper of this embodiment preferably contains or is treated with a temporary wet-strength agent and a dry-strength agent. The dry-strength agent improves the dry tensile strength, easily achieving sufficient strength and perforation strength during use. Furthermore, when the paper is wound into a long roll length on the paper tube, it is difficult to break even when the winding tension during manufacturing is increased. Moreover, when the dry tensile strength is increased, the absorbency also increases. On the other hand, if only a dry-strength agent is used to improve the dry tensile strength, hydrolysis decreases, and the paper becomes stiff, easily reducing its feel and usability. The temporary wet-strength agent does not hydrolyze due to the short-term contact with water during wiping, and has sufficient hydrolysis relative to the sufficient amount of water accumulated in the water pipes of a water-based toilet. Furthermore, the paper strength is slightly reduced compared to using only a dry-strength agent, resulting in a better feel. Therefore, by including a temporary wet strength agent along with a dry strength agent, the toilet paper has a better feel, especially when wiping moist skin after using the shower or toilet. It has high water absorption, giving a sense of security, and is a toilet paper that makes it difficult for water to penetrate the hands.

[0057] The content of the temporary wet strength agent is not limited, but is preferably 0.01 to 0.04% by mass. This temporary wet strength agent is preferably added internally during manufacturing. The type of temporary wet strength agent is not limited, and examples include polyacrylamide resin, polyamide-polyamine epichlorohydrin resin, urea resin, acid colloid-melamine resin, thermally crosslinkable coating PAM, TS-20 and TS4070 manufactured by Starlight PMC Co., Ltd., acetaldehyde-modified polyacrylamide, cationic acetaldehyde-modified polyacrylamide, and other polymeric aldehyde-functional compounds, copolymers of acrylamide monomers modified with glyoxal dialdehyde and other copolymerizable unsaturated monomers, or dialdehyde starch.

[0058] The content of the dry strength agent is not limited, but is preferably 0.005 to 0.15% by mass. This dry strength agent is preferably added internally. The type of dry strength agent is not limited, and examples include polyacrylamide, CMC (carboxymethyl cellulose), or sodium carboxymethyl cellulose, calcium carboxymethyl cellulose, and zinc carboxymethyl cellulose as salts thereof. However, starch and cationic starch are not preferred because they tend to make the surface of toilet paper hard and stiff.

[0059] A particularly preferred dry strength agent is an enzyme-based paper strength agent. The toilet paper in the roll of this embodiment particularly preferably contains such an enzyme-based paper strength agent. Unlike paper strength agents such as starch that impart strength by acting as an adhesive, the enzyme-based paper strength agent contains enzymes for decomposing polysaccharides, thereby further fibrillating the fibers and creating a fuzzy surface or interior of the fibers. Therefore, by activating the enzyme-based paper strength agent, hydrogen bonding is not hindered, only the proportion of cellulose fibers increases, thus improving the paper strength through interaction with the fibers, especially their surfaces. Furthermore, in the enzyme-based paper strength agent, the paper strength is improved in this way without hindering hydrolysis. Therefore, the feel of the toilet paper is improved, and in particular, even with higher winding lengths, roll densities, or roll winding densities, the feel of the roll surface is excellent, and the absorbency is also excellent. It should be noted that whether enzyme-based paper strength agents have an effect on fibers can be confirmed by high-performance liquid chromatography (HPLC) and mass spectrometry (LC / MS) to determine whether enzyme-based paper strength agents in toilet paper have an effect.

[0060] Here, as a paper-strength agent containing the enzyme system of the present invention, examples include paper-strength agents containing at least one of cellulase, hemicellulase, and xylanase. Examples of paper-strength agents containing such enzymes include HERCOBOND 8922 (manufactured by Riken Green Co., Ltd.), HERCOBOND EZ 4423 (manufactured by Riken Green Co., Ltd.), "Cellulosin T2" manufactured by HPI, "Meicase (registered trademark)" manufactured by Meiji Seika Pharma, "Novozyme (registered trademark) 188" manufactured by Novozyme, "Cellclast", "Marutifect CX10L, B, GCC, GC, keratinase (hemicellulase)", "Spezyme CP", and "GC 220" manufactured by Genencore. The amount added is not limited, but is preferably 0.5 to 2.0 kg / t.

[0061] The dry tensile strength of the toilet paper in this embodiment is not limited, but the longitudinal dry tensile strength 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 transverse dry tensile strength 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, which is the flow direction during papermaking. The transverse direction of the paper is also referred to as the CD direction, which is the direction orthogonal to the flow direction during papermaking (MD direction). In addition, the dry tensile strength of the present invention is based on the value measured according to JIS P 8113 (2006), and is measured as follows. Regarding the test sheet, a test sheet cut to a width of about 25 mm (±0.5 mm) × a length of about 150 mm is used in both the longitudinal and transverse directions. The measurement is performed directly on the multi-layer test sheet. The testing machine used was the Minebea TG-200N load-sensor tensile testing machine or equivalent equipment manufactured by Minebea Corporation. The clamp spacing was set to 100 mm, and the tensile speed was set to 100 mm / min. Measurements were performed in the following sequence: the two ends of the test piece were secured to the clamps of the testing machine; a tensile load was applied to the paper in the vertical direction; and the reading at the point of paper breakage (digital value) was recorded. Five sets of specimens were prepared in both the longitudinal and transverse directions, and five measurements were taken in each direction. The average of the measured values ​​was taken as the dry tensile strength in each direction.

[0062] Furthermore, regarding the toilet paper of this embodiment, the longitudinal wet tensile strength 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 transverse wet tensile strength 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. Regarding the test piece, a test piece cut to approximately 25 mm (±0.5 mm) wide and 150 mm long in both the longitudinal and transverse directions is used. In the case of multi-layered toilet paper, the measurement is performed directly in the multi-layered state. The testing machine used is the Minebea TG-200N load sensor tensile testing machine or equivalent equipment manufactured by Minebea Corporation. The clamp spacing is set to 100 mm, and the tensile speed is set to 50 mm / min. The test piece is a test piece cured in a dryer at 105°C for 10 minutes. The measurements were performed in the following order: After securing both ends of the test piece to the clamps of the testing machine, a horizontal layer of water (approximately 10 mm wide) was applied to the center of the test piece using a water-filled pen. Immediately afterwards, a tensile load was applied to the paper in the vertical direction, and the indicated value (digital value) at which the paper broke was recorded. Five sets of specimens were prepared in both the longitudinal and transverse directions, and five measurements were taken in each direction. The average of the measured values ​​was taken as the wet tensile strength in each direction.

[0063] On the other hand, the hydrolytic time of the toilet paper in this embodiment is less than 60 seconds, preferably less than 45 seconds and more than 20 seconds. If the hydrolytic time is less than 60 seconds, the possibility of causing pipe blockage when flushing the toilet is small. In addition, if it is more than 20 seconds, the possibility of the fibers immediately unraveling and breaking even when wiping with a lot of water after using the shower toilet is also small. The measurement of this hydrolytic time (looseness) is based on JIS P 4501 (1993). In the looseness test, a 300 mL beaker containing 300 mL of water (water temperature 20±5°C) is placed on a magnetic stirrer, and the rotor speed is adjusted to 600±10 rpm. A test piece with a square side of 100±2 mm is added to the beaker, and a stopwatch is started. The rotor speed temporarily drops to about 500 rpm due to the resistance of the test piece, and the speed increases as the test piece becomes loose. The stopwatch was stopped when the rotational speed returned to 540 rpm, and the time was measured in 1-second increments. For the looseness results, five tests were conducted, and the average was used. The rotor is a disc-shaped rotor with a diameter of 35 mm and a thickness of 12 mm.

[0064] On the other hand, regarding the toilet paper of this embodiment, the number of sheets soaked is preferably 9 or more. Regarding the measurement of the number of sheets soaked, multiple sheets of toilet paper are stacked using only their own weight, and 100 μL of water is dripped from a position 10 mm above the top sheet. Immediately after dripping, the penetration to the bottom layer is confirmed. Starting with a small number of stacks and increasing the number of stacks until penetration is no longer confirmed, the maximum number of sheets at which penetration is confirmed is measured. If more than 9 sheets are soaked, it can be considered toilet paper where water can penetrate extremely quickly.

[0065] Furthermore, the toilet paper of this embodiment preferably has perforated lines arranged at predetermined intervals along its length. The interval of the perforated lines is not limited and can be set to 100–120 mm. The perforated line strength is preferably 580–700 cN / 114 mm. It should be noted that the perforated line strength is measured based on the dry tensile strength measurement according to JIS P 8113 (2006). Specifically, the test specimen is selected with a length of 200 mm, a width equal to the full width of the toilet paper in its product shape, and the perforated lines located at the center of the length direction. During measurement, the paper is folded in half or four times along the length direction (corresponding to the MD direction axis) using the width of the chuck clamped in the tensile testing machine, with a clamping interval of 100 mm and a tensile speed of 100 mm / min. This measurement is performed five times, and the average value, converted to 114 mm, is taken as the perforated line strength. It should be noted that the testing machine can be the Minebea TG-200N load sensor tensile testing machine and equivalent equipment manufactured by Minebea Corporation.

[0066] Example

[0067] Furthermore, for the embodiments and comparative examples of the toilet paper rolls of the present invention, physical properties such as hydrolysis and number of sheets soaked were measured, and a sensory evaluation test was conducted on "the firmness of the roll (the hardness of the roll)," "the skin-like feel of the roll surface," "the frequency of daily roll replacement," "the thickness of the toilet paper (the sense of security during use)," "the softness of the toilet paper," "the fluffiness of the toilet paper," "the smoothness of the toilet paper," and "the wiping feel of the toilet paper." In this sensory evaluation test, 20 subjects actually used the toilet paper rolls, and each item was evaluated. In addition, Comparative Example 1, a conventional two-ply toilet paper, was used as the benchmark sample for evaluation. The evaluation was set on a 7-level scale, with the benchmark sample set to 4 points. As a comparison, scores were given in the manner of "very good = 7 points," "good = 6 points," "slightly good = 5 points," "3 points = slightly poor," "2 points = poor," and "1 point = very poor," and the average value was calculated. It should be noted that, regarding "the strength of the roll (the hardness of the roll)," cases that are harder than the reference sample are given a higher score, and cases that are softer than the reference sample are given a lower score.

[0068] It should be noted that the toilet paper used in the embodiments and comparative examples was manufactured as follows: a first sheet having a first recess and a second recess on the same side, and a second sheet were laminated with the surfaces of the first and second recesses facing outwards, thereby forming two layers. Furthermore, the second sheet had a recess of the same shape and depth as the second recess of the first sheet. The first and second recesses in Embodiments 1 to 7, Comparative Examples 1, and Comparative Examples 4 to 7 have the same shape; additionally, the first and second recesses in Comparative Examples 2 and 3 have the same shape.

[0069] In each example, a paper strength agent was used. In Examples 1 to 7 and Comparative Examples 4 to 7, an enzyme-based paper strength agent (HERCOBOND 8922, manufactured by Riken Green Co., Ltd.) was used as a dry strength agent. Additionally, a temporary paper strength agent (TS4070, manufactured by Hoshikō PMC Co., Ltd.) was used. In Comparative Example 1, cationic starch (DD4280, manufactured by Hoshikō PMC Co., Ltd.) was used as a dry strength agent. Additionally, a temporary paper strength agent (TS4070, manufactured by Hoshikō PMC Co., Ltd.) was used.

[0070] The physical properties and composition of the other embodiments and comparative examples are shown in Table 1 below. Furthermore, the measurement methods are as described above.

[0071] [Table 1]

[0072]

[0073] As shown in Table 1, the "strength of the roll (curve stiffness)" tends to increase with increasing winding length. Compared to Comparative Examples 1 to 3, the winding length of the embodiments of the present invention is longer, and the roll is evaluated as strong and stiff. However, despite this, the skin-touch feel of the roll surface is rated higher compared to Comparative Examples 1 to 3.

[0074] Furthermore, in all items related to the feel of toilet paper, such as "thickness of toilet paper (feeling of security when using it)," "softness of toilet paper," "fluffiness of toilet paper," "smoothness of toilet paper," and "wiping feel of toilet paper," the results were superior compared to Comparative Examples 1 to 3, which had a short and loosely wound roll.

[0075] Furthermore, by observing Comparative Examples 4 to 7, it can be seen that the evaluation tends to be slightly lower than that of Examples 1 to 7 of the present invention.

[0076] That is, in the embodiments of the present invention, the toilet paper becomes a roll of toilet paper that is highly absorbent and has excellent wiping properties for skin with moisture, provides a great sense of security when wiping, and has a soft, fluffy, and smooth feel. As a result, the roll has a firm rigidity and the surface of the roll has an excellent tactile feel.

[0077] Label Explanation

[0078] 1: Toilet paper roll; 10: Toilet paper; 20: Paper tube (core); L1: Roll diameter of toilet paper roll; L3: Diameter of toilet paper core; L2: Width of toilet paper roll.

Claims

1. A roll of toilet paper, comprising two layers of toilet paper wound around a paper tube, wherein the two layers of toilet paper are two sheets bonded together via recesses formed by an embossing process. Its features are, Regarding the aforementioned toilet paper rolls, the roll diameter is less than 120mm, the winding length is 34.5m to 50m, and the roll compression rate is 0.66 to 1.

50. 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 The area and depth are 0.17mm to 0.23mm. The second recess has a diameter of 0.25 mm. 2 ~0.75mm 2 The area and depth are 0.050mm to 0.090mm. 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 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.

3. The toilet paper roll according to claim 1 or 2, wherein, The winding density of the spool is 0.74 m / cm². 2 ~1.30m / cm 2 The density of the roll is 0.12 g / cm³. 3 ~0.18g / cm 3 .

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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