CN117355243A

CN117355243A - Roll toilet paper

Info

Publication number: CN117355243A
Application number: CN202280037205.XA
Authority: CN
Inventors: 天野良美
Original assignee: Daio Paper Corp
Current assignee: Daio Paper Corp
Priority date: 2021-09-30
Filing date: 2022-03-10
Publication date: 2024-01-05
Also published as: JP2023051122A; EP4356802A1; WO2023053496A1; TW202315561A

Abstract

The invention provides a roll toilet paper which is suitable for a toilet with a cleaning function and is easy to lengthen. The present invention provides a roll toilet paper, which is obtained by winding 2 layers of toilet paper around a paper tube, wherein the 2 layers of toilet paper are formed by bonding two sheets together through a recess formed by embossing, the roll diameter of the roll toilet paper is 120mm or less, the winding length is 34.5-50 m, the toilet paper comprises a first sheet and a second sheet, the first sheet is provided with a first recess and a second recess which are formed by embossing and have different depths, the depth of the first recess is 0.17-0.23 mm, the depth of the second recess is shallower than the depth of the first recess, and the toilet paper is wound on the outer surface side of the paper tube by the first sheet.

Description

Roll toilet paper

Technical Field

The present invention relates to roll toilet paper.

Background

With the popularization of toilets with a cleaning function, toilet paper is required to be suitable for use in toilets with a cleaning function.

In a toilet with a cleansing function, in order to cleanse a defecation part and a urination part with warm water or water, feces and urine must be scraped off together with moisture adhering to skin due to cleansing.

Therefore, a sanitary paper is required to have wiping properties, high water absorption, and a feeling of ease in wiping against the skin to which a large amount of water is adhered. Here, as a technique for improving wiping property or the like against skin to which moisture is attached, a lamination embossing technique is known. The lamination embossing is a technique of laminating the embossed layers with an adhesive paste, and has improved strength, thickness, and water permeability resistance.

On the other hand, toilet paper is generally sold on the market in the form of a roll toilet paper wound around a paper tube. In recent years, the length of a toilet paper wound around a paper tube has been increased in a roll toilet paper.

Prior art literature

Patent literature

Patent document 1: japanese patent No. 6021532

Patent document 2: japanese patent application laid-open No. 2019-10366

Disclosure of Invention

Problems to be solved by the invention

However, the toilet paper of the lamination embossing technique becomes too thick in paper thickness, and thus is not suitable for directly realizing the long-sizing.

On the other hand, when the basis weight of each layer is reduced in order to achieve a longer dimension, the hand feeling such as softness, fluffiness, and smoothness is easily reduced, and particularly when the basis weight is reduced in toilet paper using a laminated embossing technique, a hard and hard feel due to an adhesive paste is easily perceived.

Further, the tactile sensation of the roll surface is also deteriorated when the roll toilet paper is manufactured, and a user is easily given a harder impression.

Accordingly, a main object of the present invention is to provide a roll toilet paper as follows: the roll has a strong hardness and a long length, and is excellent in touch on the surface of the roll, because the roll is suitable for long-sized toilet paper having sufficient touch such as softness, fluffiness, smoothness, and the like, while the wiping property and the water absorption property of the skin to which moisture is adhered are high.

Means for solving the problems

The first means for solving the above problems is a roll toilet paper in which 2 sheets of toilet paper are wound around a paper tube, the 2 sheets of toilet paper are bonded together through recesses formed by embossing,

it is characterized in that the method comprises the steps of,

the roll toilet paper has a roll diameter of 120mm or less and a roll length of 34.5m to 50m,

the toilet paper has a first sheet having first and second recesses formed by embossing to have different depths,

the depth of the first concave part is 0.17 mm-0.23 mm, the depth of the second concave part is shallower than the depth of the first concave part,

the toilet paper is wound around the paper tube so that the first sheet is on the outer surface side.

A second means is the roll toilet paper of the first means, wherein the depth of the second concave portion is 0.050mm to 0.090mm.

A third means is the roll toilet paper of the first or second means, wherein 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.

A fourth means is the roll toilet paper of the first to third means, wherein the roll winding density is 0.74m/cm ² ～1.30m/cm ² The roll density was 0.12g/cm ³ ～0.18g/cm ³ 。

A fifth means is the roll toilet paper of the first to fourth means, wherein the roll compressibility is 0.66 to 1.50.

A sixth means is the roll toilet paper according to the first to fifth means, wherein the toilet paper is a toilet paper to which an enzyme-based paper power agent is applied.

A seventh means is the roll toilet paper of the first to sixth means, wherein the toilet paper does not contain starch or cationized starch.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, there is provided a roll toilet paper as follows: the roll has a strong hardness and a long length, and is excellent in touch on the surface of the roll, because the roll is suitable for long-sized toilet paper having sufficient touch such as softness, fluffiness, smoothness, and the like, while the wiping property and the water absorption property of the skin to which moisture is adhered are high.

Drawings

Fig. 1 is a perspective view of a roll toilet paper according to an embodiment of the present invention.

Fig. 2 is a schematic view for explaining the measurement procedure of the embossed depth of the present invention.

Fig. 3 is a schematic diagram for explaining a measurement method of MMD of the present invention.

Detailed Description

Next, embodiments of the present invention will be described in detail below with reference to the drawings.

As shown in fig. 1, the roll toilet paper of the present embodiment is formed by winding 2-layer water-soluble toilet paper 10, which is formed by stacking two sheets, i.e., a first sheet and a second sheet, around a paper tube (also referred to as a core) 20, and is in a cylindrical shape. The hydrolyzability here means: the easy-to-loosen degree in JIS P4501 is 100 seconds or less.

In the roll toilet paper, the roll toilet paper of the present embodiment has a winding length of about 20 to 25m, which is conventionally called a normal product, whereas in the roll toilet paper of the present embodiment, the roll toilet paper has a winding length of 34.5 to 55m, preferably 38 to 50m, and is a long product, which is sometimes called a 1.5 to 2-fold rolled product, or the like.

On the other hand, the roll diameter L1 (diameter) of the roll toilet paper of the present embodiment is 120mm or less, preferably 107 to 119mm. The roll diameter L1 of the roll toilet paper is defined as 120mm or less in JIS P4501, and a holder for setting a general roll toilet paper is manufactured based on the 120mm. The roll diameter of the roll toilet paper of the present embodiment is 120mm or less, and the roll toilet paper can be set in a general holder. The winding diameter L1 is a value measured using a diameter measuring scale manufactured by Mura Tech KDS corporation or a device corresponding thereto. The measured value is an average value at the position measurement 3 changed in the width direction. The average value of the same manufacturing lot was 5 wraps. The roll width L2 of the roll toilet paper according to the present embodiment is not limited, but is preferably 100 to 130mm. The outer diameter L3 of the paper tube is not limited, and is 34 to 42 phi mm.

The hard impression of taking the roll toilet paper in the hand is affected not only by whether the roll is dense, but also by the crushing of the concave portion by embossing, physical properties of the toilet paper, and surface characteristics due to the stretching and winding of the toilet paper. Therefore, the roll toilet paper according to the present embodiment is a double-layered toilet paper having concave portions by embossing. The weight per square meter of each 1 layer of the toilet paper is preferably 13.0-17.0 g/m ² More preferably 13.5 to 16.0g/m ² The thickness of the 2 layers is preferably 175 to 238. Mu.m, more preferably 180 to 225. Mu.m. In particular, the weight per square meter and the thickness of the paper can sufficiently improve the wiping property and water absorption property against the skin to which moisture is adhered and the feeling of ease during wiping, and further can improve the skin touch on the surface of the roll when the winding length is extended.

The measurement method of the weight per square meter (basis weight) is a method according to the specification of JIS P8124. In addition, the paper thickness measurement method is as follows: after the test piece was sufficiently conditioned under the conditions of JIS P8111 (1998) (usually about 8 hours), 2 layers were directly measured under the same conditions using a dial gauge (thickness measurer) 'pea code H type' (manufactured by kawasaki corporation). Specifically, it was confirmed that there was no dust or dust between the plunger and the measuring table, the plunger was set down on the measuring table, the scale of the dial gauge was moved to be aligned with the zero point, the plunger was lifted up to place the sample on the test table, the lever was set down at one stroke from the state where the plunger was opened to 700 μm, and the gauge at that time was read. At the time of measurement, only the plunger is placed without pressing. The circular plane of the terminal of the plunger, which had a diameter of 10mm, was abutted perpendicularly to the plane of the paper, and the load at the time of measurement of the paper thickness was about 70gf. The paper thickness was an average value obtained by performing 10 measurements.

Further, the first sheet in the toilet paper of the present embodiment has first and second recesses having different depths formed by embossing. The first concave portion and the second concave portion of the first sheet may be formed on the same surface, and the other surface may be formed with convex portions corresponding to the first concave portion and the second concave portion. The paper tube is wound so that the first sheet is on the outer surface side. In particular, the concave face may be an outer face side.

In the toilet paper, the laminated inner surface side of the first concave portion of the first sheet may be bonded to the laminated inner surface side of the second sheet to form 2 layers. The bonding may be performed by bonding the first sheet to the lamination inner surface side of the second sheet with an adhesive applied to the convex portion corresponding to the concave portion. The integration may be achieved by press-bonding by embossing called single-sided embossing. In addition, regardless of whether an adhesive is used or not, and regardless of whether single-sided embossing is performed, only the convex portions corresponding to the first concave portions of the first sheet or to both the first concave portions and the second concave portions may be formed on the outer surface of the second sheet as the first sheet and the second sheet are laminated together. On the other hand, the laminated inner surface side of the second concave portion may be bonded to the second sheet without an adhesive. The lamination inner surface side of all the first concave portions need not be bonded to the second sheet, but from the viewpoint of layer separation, it is preferable to bond all the concave portions.

In the case of using an adhesive, the adhesive may be either an aqueous adhesive or an oily adhesive. However, the preferable adhesive is a water-soluble adhesive such as PVA (polyvinyl alcohol) or CMC (carboxymethyl cellulose). CMC as a cellulose-based water-soluble binder is particularly preferred.

The adhesive itself may be an adhesive ink, or a coloring component such as a pigment or dye may be added to the adhesive. In this case, the first concave portion is colored and visually recognized, and the design is excellent. Preferred coloring components include aqueous dyes such as phthalocyanine dyes and azo metal complex salt dyes. Examples of the pigment include aluminum hydroxide, kaolin, talc, calcium carbonate, titanium dioxide, clay, and zinc oxide.

The shape of the first concave portion and the second concave portion in plan view is not limited. In particular, the first concave portion may be determined in consideration of design and the like. The area of each of the first recess and the second recess is not necessarily limited. It is also possible to have a plurality of recesses of different areas. However, in a roll toilet paper wound in a long size, the preferred area of the first concave portion is 1.00 to 22.0mm as a range in which the effect of the present invention of providing such a roll toilet paper is particularly easily exhibited ² More preferably 1.50 to 21.5mm ² The roll toilet paper is: in particular, the toilet paper has high wiping property and water absorption property against skin with water attached thereto, excellent feeling of security during wiping, sufficient hand feeling such as softness, fluffiness and smoothness, hardness firmly formed into a roll, and excellent touch feeling on the surface of the roll. The preferred area of the second concave part is 0.25-0.75 mm ² More preferably 0.30 to 0.50mm ² . Further, the embossing density of the first concave portion and the second concave portion is not limited, but the embossing density of the first concave portion is preferably 4 to 14 pieces/cm as a range in which the effects of the present invention described above are particularly easily exhibited ² More preferably, the embossing density is 7 to 11 pieces/cm ² . The second concave portion has a preferable embossing density of 2-11 pieces/cm ² More preferably, the embossing density is 5 to 8 pieces/cm ² . The embossed density was measured by selecting 50cm from the winding end side except for the tail seal.

On the other hand, the first recess of the toilet paper of the present embodiment has a depth of 0.17 to 0.23mm. The depth of the second concave portion may be shallower than the first concave portion, but is preferably 0.050 to 0.090mm. When the depths of the first concave portion and the second concave portion are such, the hand feeling of the toilet paper and the hand feeling of the roll surface are improved and improved in combination with the above-described roll diameter and roll length.

The depths of the first and second recesses are measured by an One shot 3D measuring microscope VR-3200 or a device corresponding thereto, and an image analysis software "VR-H1A" or a software corresponding thereto, manufactured by KEYENCE corporation. The measurement was performed under the conditions of a magnification of 12 times and a field area of 24mm×18 mm. However, the magnification and the field area may be appropriately changed according to the size of the embossment (concave portion). A specific measurement procedure will be described with reference to fig. 2, and the above software is used to obtain an outline of the embossing depth (measurement cross-sectional curve) on a line segment Q1, where the line segment Q1 crosses the longest portion of the peripheral edge of one concave portion 40 in the image portion (X portion in the drawing) represented by the plane view point. The ratio λc is removed from the cross-sectional profile of the embossed depth profile using a low pass filter: in a "contour curve Q2" of an image portion (Y portion in the drawing) shown in a cross-sectional view, which is obtained from a short wavelength surface roughness component, in which λc is "a filter defining a boundary between a roughness component and a waviness component" described in JIS-B0601 "3.1.1.2", 2 concave edge points P1 and P2 having the strongest upward convex curvature and the minimum value sandwiched between the concave edge points P1 and P2 are obtained as a minimum value Min of depth. Further, the average value of the depth values of the concave edge points P1 and P2 is set as the maximum value Max of the depth. Thus, embossing depth = maximum Max-minimum Min. The distance (length) in the X-Y plane of the recess edge points P1, P2 is defined as the length of the longest portion. The two concave edge points P1 and P2 which are convex upward and have the strongest curvature are selected visually. In addition, at the time of this selection, the contour E in the image of the plane view point of the concave portion 40 in this measurement may also be referred to. Similarly, the depth of the concave portion is also measured for the shortest portion in the direction perpendicular to the longest portion, and a larger value is used as the depth of the concave portion. The above measurement was performed on any 10 embossments on the surface of the toilet paper, and the average value thereof was taken as the final embossing depth.

The areas of the first concave portion and the second concave portion were also visually checked from a 3D image obtained by measuring with a one shot 3D measurement microscope VR-3200 or a device corresponding thereto and an image analysis software "VR-H1A" or a software corresponding thereto, and the areas inside the embossed concave portions were measured. The above operation was performed on any 10 embossments on the surface of the toilet paper, and the average value was used as the area of the final embossed concave portion.

Further, the toilet paper of the present embodiment is preferably: the MMD of the laminated outer surface of the first sheet, in which the first concave portion and the second concave portion are formed, is 10.0 or less. Considering the feeling of skin by the concave portion, the MMD value is more preferably 8.0 to 10.0. With respect to MMD, using the measuring apparatus 100 shown in fig. 3, while bringing the contact surface of the friction material into contact with the surface of the measurement sample to which a tension of 20g/cm was applied in a predetermined direction at a contact pressure of 25g, the contact surface of the friction material was moved at a speed of 0.1cm/s for 2cm in the direction substantially same as the direction to which the tension was applied, and the friction coefficient at this time was measured using a friction sensing tester KES-SE (manufactured by add technologies corporation) or an instrument equivalent thereto. The value obtained by dividing this friction coefficient by the friction distance (movement distance=2 cm) was MMD. The friction member is formed by adjacently connecting 20 piano wires P with the diameter of 0.5mm, and has a contact surface with the length and width of 10 mm. A unit bulge having 20 piano wires P (radius of curvature of 0.25 mm) at the tip end thereof was formed on the contact surface.

Further, the toilet paper preferably also has a concave portion formed by embossing or the like in the second sheet. By forming the concave portion by embossing in the second sheet, the difference in stretch between the second sheet and the first sheet in which the concave portion and the convex portion are formed becomes small, and occurrence of wrinkles or paper breakage during the manufacturing process can be prevented. In addition, the sanitary paper having a good balance between texture such as softness and thickness is easy to be obtained, and the effects of the present invention can be more easily exhibited. However, the area of the concave portion in the second sheet is preferably smaller than the first concave portion in the first sheet and is the same as the second concave portion. In addition, the embossing density is preferably denser than the second depressions in the first sheet. Specifically, the preferred area of the recess in the second sheet is 0.25 to 0.75mm ² More preferably 0.30 to 0.50mm ² . Further, in the second sheetThe embossing density of the preferred recesses of (2) to (12) per cm ² More preferably, the embossing density is 2 to 11 pieces/cm ² More preferably, the embossing density is 4 to 8 pieces/cm ² 。

Further, the softness of the sanitary napkin is preferably 1.8 to 2.7cN/100mm, more preferably 2.0 to 2.6cN/100mm. The softness was measured based on a manual measurement method according to JIS L1096 (2010) E method.

In the toilet paper according to the present embodiment, when MMD and softness are in the above ranges, in particular, the hand feeling and the hand feeling on the roll surface are improved and improved.

Here, the roll toilet paper of the present embodiment is particularly preferably: the winding density of the winding drum is 0.74-1.30 m/cm ² The density of the winding drum is 0.12-0.18 g/cm ³ 。

The roll winding density is expressed by (winding length x number of layers)/(cross-sectional area of the roll). The cross-sectional area of the roll is represented by { the cross-sectional area of the roll diameter (outer diameter) L1 portion of the roll } - (the cross-sectional area of the paper tube outer diameter L3 portion). Therefore, for example, when winding length=46 m, 2 layers, winding diameter l1=115 mm, and paper tube outer diameter l3=38 mm, winding density= (46 m×2)/(3.14× (115 mm/2/10)) ² -3.14×(38mm÷2÷10) ² }＝0.99m/cm ² 。

In addition, the roll density is expressed by (roll mass)/(roll volume). Roll mass is the mass of roll toilet paper per 114mm roll width. The volume of the winding drum is defined by [ { the cross-sectional area of the winding diameter (diameter) L1 part of the winding drum } - (the cross-sectional area of the paper tube outer diameter L3 part)]The x web width (in terms of each 114 mm). For example, when the roll weight (except the core) per 114mm roll width is 152g, the roll diameter l1=115 mm, and the paper tube outer diameter l3=38 mm, the roll density is 152g [ {3.14× (115 mm ≡2 ≡10) ² -3.14×(38mm÷2÷10) ² }×(114mm÷10)]＝0.14g/cm ³ 。

The roll winding density and the roll density are indicators of how dense and how hard or loose the roll is in the roll toilet paper. Further, if too loose, the vicinity of the paper tube may be easily excessively deformed such as flying out, and if too hard, the roll toilet paper may have a hard impression when held in the hand.

The roll toilet paper of the present embodiment is preferably the roll winding density and the roll density described above, and the roll compression ratio is preferably 0.66 to 1.50.

The roll compression ratio is represented by (cross-sectional area calculated based on the paper thickness)/(cross-sectional area of the roll). The calculation method of (cross-sectional area of the roll) is the same as that of (cross-sectional area of the roll) in the roll winding density. The term (cross-sectional area calculated based on the thickness of paper) is a value calculated by (thickness of paper) x (winding length). The value (cross-sectional area calculated based on the paper thickness) does not take into consideration the gap when winding the toilet paper around the paper tube. On the other hand, the value of (the cross-sectional area of the roll) takes into account the gap when winding the toilet paper around the paper tube. Therefore, the roll compressibility expressed by the ratio of (the cross-sectional area calculated based on the paper thickness) to (the cross-sectional area of the roll) is also an indicator of how hard or loose the roll is wound in the roll toilet paper. Further, as described above, if too loose, the vicinity of the paper tube may be easily excessively deformed such as flying out, and if too hard, a hard impression may be generated when holding the roll toilet paper. In addition, the roll winding density is easily affected by the number of layers, and the roll compressibility is easily affected by the thickness of the paper.

In the case of the roll density and the roll winding density, the hand feeling of the roll surface is further improved and improved particularly in combination with the hand feeling of the toilet paper structure.

On the other hand, the toilet paper of the present embodiment is preferably: the fiber formed is pulp derived from broad-leaved tree, and 55 mass% or more, preferably 60 mass% or more and 70 mass% or less. The pulp from broad-leaved tree has short fiber length and is easy to make the paper surface have good texture. The roll toilet paper of the present embodiment has a long winding length and is easily perceived as hard, but by setting the pulp from the broad-leaved tree to 55 mass% or more, the smoothness is improved and the hardness is easily perceived as hard. In addition, the hand feeling in use is also improved. As pulp derived from broad-leaved trees, LBKP (broad-leaved tree kraft pulp), LUKP, LOKP, and the like are known, but LBKP after bleaching treatment is preferable. The fibers other than pulp derived from broad-leaved trees are preferably pulp derived from conifer trees. In this case, NBKP (conifer kraft pulp) after chlorine bleaching is preferable.

The toilet paper of the present embodiment preferably contains or is acted upon by a temporary wet strength agent and a dry strength agent. The dry tensile strength is improved by the dry strength agent, and sufficient strength and perforation line strength during use are easily formed. In addition, when winding a paper tube with a long winding length, paper breakage is difficult even if the winding tension at the time of manufacture is increased. Further, when the dry tensile strength is increased, the water absorption is also increased. On the other hand, if the dry tensile strength is increased by only the dry strength agent, the hydrolyzability is reduced, and the paper becomes hard and the feel and feeling in use are easily reduced. The temporary wet strength agent is not hydrolyzed by short-term contact with moisture during wiping, has sufficient hydrolyzability with respect to a sufficient amount of moisture accumulated in a water storage pipe in an aqueous toilet, and has a slightly lower paper strength than when only the dry strength agent is used, thereby providing a good hand feel. Therefore, by including the temporary wet strength agent together with the dry strength agent, the hand feeling as a toilet paper is more excellent, and particularly, the toilet paper has sufficient strength when wiping the skin to which moisture adheres after the use of the shower toilet, has a high moisture absorption property with a feeling of ease, and is likely to be a toilet paper in which moisture hardly permeates into the hands.

The content of the temporary wet strength agent is not limited, but is preferably 0.01 to 0.04 mass%. The temporary wet strength agent is preferably added internally at the time of production. The type of the temporary wet strength agent is not limited, and examples thereof include a polyacrylamide resin, a polyamide polyamine epichlorohydrin resin, a urea resin, an acid colloid melamine resin, a heat-crosslinkable coated PAM, a polymer aldehyde-functional compound such as TS-20, TS4070, glyoxalated polyacrylamide, cationic glyoxalated polyacrylamide, a copolymer of an acrylamide monomer modified with a divalent aldehyde of glyoxal and other copolymerizable unsaturated monomer, or dialdehyde starch.

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 added internally. The type of the dry strength agent is not limited, and examples thereof include polyacrylamide, CMC (carboxymethyl cellulose), sodium carboxymethyl cellulose, calcium carboxymethyl cellulose, and zinc carboxymethyl cellulose as salts thereof. However, starch and cationized starch are not preferable because they tend to give a hard and hard texture to the surface of the toilet paper.

Particularly preferred dry strength agents are enzymatic paper strength agents. The toilet paper in the roll toilet paper of the present embodiment is particularly preferably a paper strength agent containing the enzyme system. Unlike paper agents such as starch, which act as binders to impart strength, enzyme-based paper agents act to contain enzymes for decomposing polysaccharides, and thus act to fibrillate fibers and fuzze the surfaces or the interiors of fibers. Therefore, by allowing the enzyme-based paper agent to act, hydrogen bonding is not hindered, and only the ratio of cellulose fibers is increased, so that the paper force is improved by the entanglement interaction with the fibers, particularly the surface. Further, in the enzyme-based paper agent, the paper strength is improved in this way, but the hydrolyzability is not hindered. Therefore, the hand feeling of the toilet paper is improved, and in particular, even if the winding length side length, the roll density or the roll winding density becomes high, the hand feeling of the roll surface is excellent and the water absorption is excellent. Whether or not the enzyme-based paper agent acts on the fibers can be confirmed by High Performance Liquid Chromatography (HPLC), mass spectrometry (LC/MS), or the like.

Examples of the enzymatic agent of the present invention include agents containing at least one of cellulase, hemicellulase and xylanase. Examples of the paper strength agent containing such an enzyme include HERCOBOND 8922 (manufactured by Kyowa Co., ltd.), HERCOBOND EZ 4423 (manufactured by Kyowa Co., ltd.), "Cellulose T2" manufactured by HPI, and "Meicase (registered trademark) manufactured by Meiji Seika Pharma, and" Novozyme 188 "manufactured by Novozyme, and" Marutect CX10L, B, GCc, GC, cutinase (hemicellulase) "," Spezyme CP "," GC 220 "manufactured by Genencore. The amount to be added is not limited, but is preferably 0.5 to 2.0kg/t.

The dry tensile strength of the toilet paper of the present embodiment is not limited, but the dry tensile strength in the machine direction is 400cN/25mm or more and 600cN/25mm or less, preferably 450cN/25mm or more and 580cN/25mm or less, and the dry tensile strength in the transverse direction is 100cN/25mm or more and 200cN/25mm or less, preferably 135cN/25mm or more and 180cN/25mm or less. The machine direction of the paper is also referred to herein as the MD direction, which is the flow direction during papermaking. The cross direction of the paper is also referred to as CD direction, and is a direction orthogonal to the flow direction (MD direction) at the time of papermaking. The dry tensile strength of the present invention is a value measured based on JIS P8113 (2006), and is measured as follows. As the test piece, a test piece cut to a width of 25mm (+ -0.5 mm) by a length of about 150mm in both the longitudinal and transverse directions was used. The multilayer test piece was directly measured. As the test machine, a load cell tensile tester TG-200N manufactured by Minebea corporation and equipment corresponding thereto were used. The clamp interval was set to 100mm, and the stretching speed was set to 100mm/min. The measurements were performed in the following order: the two ends of the test piece were fastened to a jig of a tester, a tensile load was applied to the paper sheet in the up-down direction, and an indication value (digital value) at the time of paper breakage was read. 5 sets of test pieces were prepared in the machine direction and the transverse direction, and each test piece was measured 5 times, and the average of the measured values was taken as the dry tensile strength in each direction.

In the toilet paper according to the present embodiment, the wet tensile strength in the machine direction is 20cN/25mm or more and 60cN/25mm or less, preferably 30cN/25mm or more and 55cN/25mm or less, and the wet tensile strength in the transverse direction is 10cN/25mm or more and 30cN/25mm or less. The wet tensile strength is a value measured based on JIS P8135 (1998), and is measured as follows. As the test piece, a test piece cut to a width of 25mm (+ -0.5 mm) by a length of about 150mm in both the longitudinal and transverse directions was used. In the case where the toilet paper is multilayered, measurement is directly performed in a multilayered state. As the test machine, a load cell tensile tester TG-200N manufactured by Minebea corporation and equipment corresponding thereto were used. The clamp interval was set to 100mm, and the stretching speed was set to 50mm/min. The test piece was cured for 10 minutes using a dryer at 105 ℃. The measurements were performed in the following order: after both ends of the test piece were fastened to a jig of a tester, water was applied horizontally to the center of the test piece with a width of about 10mm using a horizontal pen, and then a tensile load was immediately applied to the paper sheet in the up-down direction, and an indication value (digital value) at the time of paper breakage was read. 5 sets of test pieces were prepared in the machine direction and the transverse direction, and each test piece was measured 5 times, and the average of the measured values was taken as the wet tensile strength in each direction.

On the other hand, the toilet paper of the present embodiment has a hydrolyzability of 60 seconds or less, preferably 45 seconds or less and 20 seconds or more. If the hydrolyzability is 60 seconds or less, the pipe is less likely to be clogged when the water is flushed and discarded into a toilet or the like. In addition, if the amount of water is 20 seconds or more, the possibility of breaking the fibers by immediately untangling the fibers is reduced even when a large amount of water is wiped after using the shower toilet. The measurement of the hydrolyzability (easy looseness) was based on JIS P4501 (1993). In the test of the easy-to-loosen dispersion, a 300mL beaker containing 300mL of water (water temperature 20.+ -. 5 ℃ C.) was placed on a magnetic stirrer, and the rotational speed of the rotor was adjusted to 600.+ -. 10 rpm. A square test piece having one side of 100.+ -.2 mm was put into the flask, and a stopwatch was pressed. The rotational speed of the rotor temporarily drops to about 500 revolutions due to the resistance of the test piece, and as the test piece becomes loose, the rotational speed rises. The stop watch is stopped at the time when the rotation speed is restored to 540 revolutions, and the time is measured in 1 second. For the result of the easy-to-loosen dispersion, 5 tests were performed, expressed as an average thereof. The rotor is disc-shaped with a diameter of 35mm and a thickness of 12 mm.

On the other hand, in the toilet paper according to the present embodiment, the number of impregnated sheets is preferably 9 or more. For measurement of the number of impregnated sheets, a plurality of toilet paper sheets were stacked by only their own weights, 100. Mu.L of water was dropped from a position 10mm above the uppermost toilet paper sheet, and immediately after the dropping, the impregnation into the lowermost layer was confirmed. The number of layers was increased from the start of the small number of layers until permeation was not confirmed, and the maximum number of sheets that can be confirmed by permeation was measured. If it exceeds 9 sheets, it can be said that the toilet paper can be extremely rapidly penetrated by moisture.

Further, the toilet paper of the present embodiment is preferably provided with perforation lines at predetermined intervals in the longitudinal direction. The distance between the perforation lines is not limited and may be set to 100 to 120mm. The strength of the perforation line is preferably 580-700 cN/114mm. The measurement of the perforation line strength was performed based on the measurement of the dry tensile strength based on JIS P8113 (2006). Among them, the measurement sample was selected so that the full width of the toilet paper having a length of 200mm and a width of the product-like body was set at the center in the longitudinal direction of the perforation line. In the measurement, the tensile test machine was measured with the width of the chuck clamped in the tensile test machine folded in half or four along the longitudinal direction (corresponding to the MD axis), the clamping interval was set to 100mm, and the tensile speed was set to 100mm/min. This measurement was performed 5 times, the width was converted to 114mm, and the average value was taken as the perforation line strength. As the test machine, a load cell tensile tester TG-200N manufactured by Minebea corporation and equipment corresponding thereto may be used.

Examples

Further, physical properties and compositions such as hydrolyzability and the number of impregnated sheets were measured for the roll toilet paper of the present invention, and further, sensory evaluation tests were performed on "firm feel of roll (hardness of roll)", "skin feel of roll surface", "frequency of change of roll per day", "thickness feel of toilet paper (feel of ease in use)", "softness of toilet paper", "fluffy feel of toilet paper", "smoothness of toilet paper" and "wiping feel of toilet paper". In this sensory evaluation test, the number of subjects was 20, and each item was evaluated using a roll toilet paper. The test piece was evaluated based on comparative example 1, which is a conventional 2-layer normal product. The evaluation was rated at 7, the reference sample was rated at 4 points, and the average value was calculated by scoring the sample so that the sample was particularly good=7 points, good=6 points, slightly good=5 points, 3 points=slightly bad, 2 points=bad, and 1 point=particularly bad, as a comparison. The "roll firmness (roll hardness)", which is higher score than the case of the reference sample, and lower score than the case of the reference sample, was set.

The toilet paper used in the examples and comparative examples was as follows: the first sheet having the first concave portion and the second concave portion on the same surface and the second sheet are laminated so that the formation surfaces of the first concave portion and the second concave portion are outside, thereby forming 2 layers. The second sheet has a concave portion having the same shape and depth as the second concave portion of the first sheet. The first concave portion and the second concave portion in examples 1 to 7, comparative example 1, and comparative examples 4 to 7 have the same shape, and the first concave portion and the second concave portion in comparative example 2 and comparative example 3 have the same shape.

Paper agents were used in each example. In examples 1 to 7 and comparative examples 4 to 7, an enzyme-based paper strength agent (HERCOBOND 8922, manufactured by the company licarpae green) was used as the dry strength agent. A temporary paper agent (TS 4070, available from PMC Co., ltd.) was used. Comparative example 1 was conducted using a cationized starch (DD 4280. Star. PMC Co.) as a dry strength agent. In addition, a temporary paper agent (TS 4070 star PMC) was used.

Physical properties and compositions of the other examples and comparative examples are shown in Table 1 below. In addition, the measurement method is as described above.

TABLE 1

As the results shown in table 1, the "firmness of the roll (hardness of the roll)" tends to be higher as the winding length becomes longer. The winding length of the example of the present invention was longer than that of comparative examples 1 to 3, and evaluated as: the spool is firm and has hardness. However, the evaluation of the skin feel on the roll surface was higher than that of comparative examples 1 to 3.

Further, the results were more excellent than those of comparative examples 1 to 3, in which the winding length was short and the winding was loosely performed, among all items of "thickness feeling of toilet paper (feel of ease in use)", "softness of toilet paper", "fluffy feeling of toilet paper", "smoothness of toilet paper" and "wiping feeling of toilet paper".

Further, by observing comparative examples 4 to 7, it was found that the evaluation ratio tended to be slightly lower than in examples 1 to 7 of the present invention.

That is, in the embodiment of the present invention, the toilet paper becomes roll toilet paper as follows: the roll has high wiping property and water absorption property against skin with water, excellent feeling of security during wiping, sufficient hand feeling such as softness, fluffiness and smoothness, firm hardness and excellent touch feeling on the surface of the roll.

Description of the reference numerals

1: a roll toilet paper; 10: toilet paper; 20: paper tube (core); l1: the roll diameter (diameter) of the roll toilet paper; l3: the diameter of the core of the roll toilet paper; l2: width of the roll toilet paper.

Claims

1. A roll toilet paper is formed by winding 2 layers of toilet paper around a paper tube, wherein the 2 layers of toilet paper are formed by bonding two sheets together through concave parts formed by embossing,

it is characterized in that the method comprises the steps of,

2. The roll toilet paper according to claim 1, wherein,

the depth of the second concave part is 0.050 mm-0.090 mm.

3. The roll toilet paper according to claim 1 or 2, wherein,

the second sheet has a recess formed by embossing, the depth of the recess being shallower than the depth of the first recess formed in the first sheet.

4. A roll toilet paper according to any one of claims 1 to 3, wherein,

the winding density of the winding drum is 0.74m/cm ² ～1.30m/cm ² The roll density was 0.12g/cm ³ ～0.18g/cm ³ 。

5. The roll toilet paper according to any one of claims 1 to 4, wherein,

the compression ratio of the winding drum is 0.66-1.50.

6. The roll toilet paper according to any one of claims 1 to 5, wherein,

the toilet paper is a toilet paper to which an enzyme-based paper power agent is applied.

7. The roll toilet paper according to any one of claims 1 to 6, wherein,

the toilet paper does not contain starch and cationized starch.