JP2021087521A - Toilet roll - Google Patents

Abstract

To provide a soft toilet roll having clear embossment.SOLUTION: In a toilet roll 1, a paper thickness is 120-150 μm, a dry tensile strength in an MD direction is 190-310 cN/25 mm, a dry tensile strength in a CD direction is 60-120 cN/25 mm, and embossed one-ply toilet tissue paper is wound as long as 54.5-56.7 m around a tube axis with an outer diameter of 35-45 mm, and a wound diameter is 104-108 mm.SELECTED DRAWING: Figure 1

Description

The present invention relates to a toilet roll in which toilet paper is rolled into a roll.

The winding length of toilet paper in a toilet roll is defined by JIS standards as 27.5 m, 32.5 m, 55 m, 65 m, 75 m, and 100 m. Not limited to this, there are various products with different lengths of toilet paper wrapped according to consumer demand, but most of the general popular products are about 55 m in the above JIS standard with one ply. ..

Toilet paper is used by directly touching the skin and is also used for wiping stool, so softness and stool wiping property are important. And, some toilet papers are embossed for such softness and wiping property.

Further, with the spread of shower toilets in recent years, toilet paper is not a high-priced product such as a shower toilet exclusive product, and it is required to improve the water absorption even in a popular product.

By the way, when a consumer purchases a toilet roll, he / she touches it in the state of the toilet roll, so the consumer may judge the softness of the toilet paper by the hardness of the toilet roll. The diameter of the toilet roll is defined as 120 mm or less in the JIS standard, and is generally about 100 to 110 mm. In order to increase the softness of the toilet roll, the toilet paper may be loosely wrapped around a shaft such as a paper tube within a specified diameter, but if the winding is excessively loose, wrinkles will form between the layers of the toilet paper. It is more likely to occur.

In particular, the embossed toilet paper has an uneven surface, so if the roll is loosened, the embossing is likely to be crushed when the user or the like holds it in his / her hand when purchasing the toilet roll or replacing the toilet roll. .. In addition, wrinkles may occur at that time. On the other hand, if the winding is hardened, the sharpness of the unevenness due to embossing will decrease.

Japanese Unexamined Patent Publication No. 2005-348976 Japanese Unexamined Patent Publication No. 2018-064664

Therefore, the main problem of the present invention is that it has an appropriate roll hardness, and it is difficult for unevenness to be crushed or wrinkled by embossing when the toilet roll is held during and after manufacturing, and further, unevenness due to embossing. The purpose is to provide a toilet roll having excellent clarity and water absorption of toilet paper.

The first means to solve the above problems is
An embossed 1-ply toilet paper having a paper thickness of 120 to 150 μm, a dry tensile strength in the MD direction of 190 to 310 cN / 25 mm and a dry tensile strength in the CD direction of 60 to 120 cN / 25 mm has an outer diameter of 35. It is a toilet roll characterized in that a length of 54.5 to 56.7 m is wound around a pipe shaft of to 45 mm, and a winding diameter is 104 to 108 mm.

The second means is
The embossing pattern on toilet paper is
A square with a bottom surface of 1.0 to 1.5 x 1.0 to 1.5 mm or a concave portion forming a substantially square in which the squares of the square extend diagonally outward is centered on the entire paper surface. It is arranged in a grid pattern with an arrangement angle of 45 ° with respect to the width direction at 4.5 to 5.5 mm, and
The toilet roll according to the first means, which has a valley line portion extending from each of the four sides of the recess between the recesses.

The third means is
The toilet paper is a toilet roll according to the first or second means, which comprises a softener, a moisturizer, and a viscous agent.

According to the above invention, it has an appropriate roll hardness, is less likely to cause crushing and wrinkles of unevenness due to embossing when holding a toilet roll, and is excellent in sharpness of unevenness due to embossing. Toilet rolls with excellent water absorption of toilet paper are provided.

It is a perspective view of the toilet roll which concerns on embodiment. It is a top view of the embossing which concerns on embodiment. It is the schematic for demonstrating the measurement procedure of the embossing depth which concerns on embodiment. It is a figure for demonstrating the measuring method of MMD. It is a figure which shows the result of the water absorption test which concerns on embodiment.

Next, the toilet roll of the present embodiment will be described with reference to the drawings.

The toilet roll of the present embodiment has a paper thickness of 120 to 150 μm, a dry tensile strength in the MD direction of 190 to 310 cN / 25 mm or more, and a dry tensile strength in the CD direction of 60 to 120 cN / 25 mm, and is embossed. A 1-ply toilet paper is wound with a length of 54.5 to 56.7 m around a pipe shaft having an outer diameter of 35 to 45 mm, and has a winding diameter of 104 to 108 mm.

By adopting these configurations, the hardness of the roll is appropriate, and it is difficult for the embossing to crush or wrinkle the unevenness when holding the toilet roll during and after the manufacturing, and further, the unevenness due to the embossing is sharpened. It will be excellent. Further, it is better that the Krem water absorption is 33 to 60 mm / 3 minutes. Further, each configuration will be described in detail.

The winding diameter of the toilet roll is defined as 120 mm or less in JIS P 4501, and a holder for setting a general toilet roll is created based on this 120 mm. The winding diameter L2 (diameter) of the toilet paper according to the present embodiment is 104 to 108 mm, which is a winding diameter that can be sufficiently set in a general holder. Here, the winding diameter is a value measured using a dial meter rule manufactured by Muratec-KDS Co., Ltd. or an equivalent machine thereof. The measured value shall be the average value measured at three locations by changing the location in the width direction. The average value of the same production lot product is the average value of 5 rolls.

The toilet roll according to the present embodiment has a roll length of 1-ply toilet paper of 54.5 to 56.7 m. The winding length of a conventional 1-ply product of a popular product for general households is about 55 m, and the toilet roll according to the present embodiment is secured to have a length similar to the winding length of a general popular product. .. The winding length is measured while unwinding the toilet roll without applying tension. For example, the measurement may be performed while folding back in a zigzag manner by 5 m from the unwinding.

The core diameter of the toilet roll is defined as 38 mm ± 1 mm in JIS P 4501, and this standard is referred to, but the actual situation is that there are various types depending on the product. The pipe shaft according to the present embodiment has an outer diameter of 35 to 45 mm, which is within the range of a general product, and can be sufficiently used in a toilet roll holder of a kind that rotates a toilet roll through a shaft core through the pipe shaft. Further, by setting the outer diameter of the pipe shaft of the present embodiment, it is possible to obtain an appropriate roll hardness when the toilet paper according to the present invention is wound with the above winding length. In addition, it is possible to prevent crushing and wrinkles of unevenness due to embossing when holding the toilet roll.

The width of the toilet roll is not limited, but is generally 110 to 120 mm, and it is desirable that the width of the toilet roll of the present embodiment is also within this range.

The toilet paper according to the present embodiment has one ply, and the paper thickness is 120 to 150 μm. With 2 plies or more, it is not possible to obtain an appropriate roll hardness in relation to other configurations. That is, the effect of the present invention is not exhibited. This paper thickness is a little thicker than the popular toilet paper. By setting the paper thickness of the present invention in the range, the unevenness due to the embossing process becomes clear. Here, the method of measuring the paper thickness is as follows: the test piece is sufficiently humidity-controlled under the conditions of JIS P 8111 (1998) (usually about 8 hours), and then the dial thickness gauge (thickness measuring instrument) is used under the same conditions. It shall be measured in the state of 1 ply using "PEACOCK G type" (manufactured by Ozaki Seisakusho). Specifically, after confirming that there is no dust, dust, etc. between the plunger and the measuring table, lower the plunger on the measuring table, move the memory of the dial thickness gauge to set the zero point, and then set the zero point. , Raise the plunger, place the sample on the test table, slowly lower the plunger and read the gauge at that time. At this time, since the toilet paper according to the present invention has irregularities due to embossing, one concave portion (convex portion) constituting the embossing must be within the range of the measuring table. When the embossing pattern is composed of a plurality of recesses having different depths, the deepest species of recesses should be located. At the time of this measurement, the plunger is only put on and not pressed. The terminal of the plunger is made of metal so that a circular plane having a diameter of 10 mm hits the paper plane perpendicularly, and the load at the time of measuring the paper thickness is about 70 gf. The paper thickness is an average value obtained by performing the measurement 10 times. Here, when measuring the paper thickness, crushing of the emboss (recess) is assumed, but the paper thickness according to the present invention is a value measured including such crushing, and such crushing is ignored. Good. In the paper thickness measurement, the difference in paper thickness caused by the crushing of the recesses can be ignored.

The toilet paper according to the present embodiment has a dry tensile strength of 190 to 310 cN / 25 mm in the MD direction (longitudinal direction) and a dry tensile strength of 60 to 120 cN / 25 mm in the CD direction (horizontal direction). More preferably, the dry tensile strength in the MD direction (longitudinal direction) is 235 to 250 cN / 25 mm and the dry tensile strength in the CD direction (horizontal direction) is 90 to 110 cN / 25 mm. By setting it within the range of the dry tensile strength, it is not particularly hard to feel excessive hardness during use. Further, even if the winding length and the winding diameter of the toilet roll are excellent, the unevenness due to the embossing process is excellent, and the wrinkles are not present or the winding diameter is extremely improved. That is, the unevenness due to the embossing process is not excessively stretched during manufacturing, and wrinkles are extremely unlikely to occur. The dry tensile strength is measured based on the tensile test of JIS P8113 (2006). The test piece used is cut to a width of 25 mm (± 0.5 mm) and a length of about 150 mm in both the vertical and horizontal directions. As the testing machine, a load cell tensile testing machine TG-200N manufactured by Minebea Co., Ltd. and its equivalent are used. The grip interval is set to 100 mm. The measurement is performed by tightening both ends of the test piece to the grip of the testing machine, applying a tensile load to the paper piece in the vertical direction, and reading the indicated value (digital value) when the paper breaks. The tensile speed is 100 mm / min. Five sets of samples are prepared in each of the vertical direction and the horizontal direction, and measurements are made 5 times each, and the average of the measured values is taken as the dry tensile strength in each direction. Preparation of the sample follows JISP8111 (1998). The dry tensile strength can be adjusted by a known method as long as the effects of the present invention are not impaired.

On the other hand, in order to adjust the dry tensile strength and further improve the softness of the toilet paper, it is desirable that the toilet paper according to the present embodiment is added with a softener, a moisturizer, and a viscous agent. These softeners, moisturizers, and viscous agents adjust the softness and paper strength of the base paper that is internally added during papermaking. The softener, the moisturizer and the viscous agent can be appropriately selected from the internal softener used for toilet paper, the internal moisturizer, and the viscous agent for pulp slurries. Examples of the softener include fatty acid ester compounds. The fatty acid ester compound may be either a cationic fatty acid ester compound or a nonionic fatty acid ester compound, and a plurality of types may be added. Further, for example, a fatty acid ester-based softening agent disclosed in US Pat. No. 3,296,065, a quaternary ammonium salt-type cationic surfactant disclosed in JP-A-48-222701, etc., JP-A-2. Non-cationic surfactants disclosed in JP-A-99690, JP-A-2-99691, etc., urethane alcohols or salts or cationized products thereof disclosed in JP-A-60-139897, etc., JP-A-2. One or more of the polyphosphates disclosed in JP-A-36288, etc., and the polysiloxanes disclosed in JP-A-2-224626, JP-A-3-900, etc. are appropriately selected and used. can do. Preferred examples include those containing a nonionic surfactant having an alkyl group and / or an alkenyl group (component A) and a cationic surfactant having an alkyl group and / or an alkenyl group (component B). Be done. In the latter case, it is particularly desirable that the nonionic surfactant (component A) has an alkyl group having 6 to 24 carbon atoms and / or an alkenyl group having 6 to 24 carbon atoms as a hydrophobic portion. If the carbon number of the component A is less than 6, the softening effect may not be enhanced, and if the carbon number exceeds 24, the dispersibility when added to the papermaking system may be deteriorated. Examples of the moisturizer include cationic polyethic emulsions, fatty acid amides, and fatty acid amide compounds. Moreover, as a thickener, a polyethylene oxide (polyethylene glycol) type thickener and the like can be mentioned.

It is desirable that the toilet paper according to the present embodiment has a softness of 2.0 to 4.5 cN measured based on the handle ometer method according to the JIS L 1096 (2010) E method. More preferably, it is 2.4 to 4.5 cN, particularly 2.5 to 4.0 cN. Softeners, moisturizers, mucilages and embossed patterns can be adjusted to this range. If the softness is in the range of 2.0 to 4.5 cN, you can feel the softness of toilet paper when using it.

The toilet paper according to the present embodiment is not necessarily limited in basis weight, but it is desirable ^{that the basis weight is 21.0 to 23.5 g / m 2.} Preferably, it is 21.5 to 23.0 g / m ² . More preferably, it is 21.8 to 22.8 g / m ² . By setting the basis weight within the range of the above-mentioned paper thickness, it is easy to adjust to the range of dry tensile strength and excellent water absorption is exhibited. In particular, when the unevenness due to embossing is made clear, if the paper thickness is increased and the basis weight is increased, the fibers in the pressed portion may be tightened and the water absorption may be reduced. In the above configuration, the water absorption is further enhanced in the range of the paper thickness and the basis weight.

The toilet paper according to this embodiment is embossed. Since the toilet paper is embossed, it becomes soft in the bending direction of the toilet paper, and the unevenness of the surface makes it easy to wipe off stool. Further, when the toilet paper is embossed, the surface of the paper has irregularities, so that a space is created between the layers when the toilet paper is wound into a roll, and this space makes it easier to express the softness of the roll. The embossing is a process called single embossing, in which only a concave portion is present on one surface and only a convex portion corresponding to the concave portion is present on the other surface. In the toilet roll of the present embodiment, the concave portion side is wound as the outer surface side.

The embossing pattern is not always limited. Appropriate embossing patterns such as micro-embossing, dot-shaped embossing, and design embossing can be used. However, a suitable embossing pattern is that the area of the recess is 1.0 to ^{2.5 mm 2} , the density is 0.01 to 0.5 pieces / mm 2, and the embossing depth is 0.02 to 0.5 mm. is there. The softness of the toilet paper is improved, and the softness in the rolled state is increased like a toilet roll, which makes it easier for consumers to feel soft when held in their hands, and the unevenness due to embossing is not crushed and is clear. It will also be excellent. In particular, as shown in FIG. 2, a square recess 31 (FIG. 2A) or a square thereof whose bottom surface is diagonal L4 × diagonal L4 = 1.0 to 1.5 × 1.0 to 1.5 mm over the entire paper surface. The recesses 32 forming a substantially square (FIG. 2B) in which the four directions of the above extend diagonally outward are arranged in a grid pattern with a center spacing of 4.5 to 5.5 mm and an arrangement angle of 45 ° with respect to the width direction. It is arranged and has a valley line portion 33 extending from the squares of the recesses between the recesses 31 (32) and the recesses 31 (32). It is desirable that the valley line portion 33 is gradually and gently arranged in a cross-sectional arch so that the four directions of the recesses 31 (32) are the deepest and the middle between the recesses is the shallowest. In this embossed pattern, the tension at the time of winding is dispersed by the valley line portion toward 45 ° in the width direction, and the unevenness due to embossing becomes extremely clear in the winding length of the toilet roll according to the present invention, and wrinkles are formed. Etc. are unlikely to occur. In addition, the softness of the toilet paper itself and the wiping property of stool are also excellent. The embossing depth is an average value of the depths of the recesses.

The depth of the recess due to embossing is measured by a one-shot 3D measurement macroscope VR-3200 manufactured by Keyence Co., Ltd. or its equivalent, and image analysis software "VR-H1A" or its equivalent software. The measurement is performed under the conditions of a magnification of 12 times and a visual field area of 24 mm × 18 mm. However, the magnification and the viewing area can be appropriately changed depending on the size of the embossing (recess). The specific measurement procedure will be described with reference to FIG. 3. Using the above software or the like, the longest portion of the peripheral edge of one emboss (recess) 40 in the image portion (X portion in the figure) shown from a planar viewpoint. Obtain the embossing depth (measured cross-sectional curve) profile at the line segment Q1 that crosses. From the cross-sectional curve of this embossing depth profile, λc: 800 μm (however, λc is shorter than the “filter that defines the boundary between the roughness component and the waviness component” described in JIS-B0601 “3.1.1.2”). Of the "contour curve Q2" of the image part (Y part in the figure) shown from the cross-sectional viewpoint obtained by removing the surface roughness component of the wavelength with a low frequency filter, the two that are convex upward and have the strongest bending. The minimum value between the concave edge points P1 and P2 and the concave edge points P1 and P2 is obtained, and the minimum depth is set to Min. Further, the average value of the depth values of the recessed edge points P1 and P2 is defined as the maximum depth value Max. In this way, the embossing depth = maximum value Max-minimum value Min. Further, the distance (length) of the concave edge points P1 and P2 on the XY plane is defined as the length of the longest portion. The two concave edge points P1 and P2 that are convex above and have the strongest bending are visually selected. In selecting the image, the contour E in the image of the plane viewpoint of the embossed (recessed portion) 40 during the measurement may be referred to. Similarly, the depth of the emboss (recess) is measured for the shortest part in the direction perpendicular to the longest part, and the larger value is adopted as the depth of the emboss (recess). The above measurement is performed on any 10 embosses on the surface of the toilet paper, and the average value thereof is taken as the final embossing depth.

In the toilet paper according to the present embodiment, the value of MMD, which is an index of surface properties, is 7.0 to 12.0, preferably 8.0 to 10.0 on the front surface (recess forming surface), and the back surface (convex). The part forming surface) is preferably 9.0 to 15.5, preferably 10.0 to 11.0. Since the toilet paper according to the present embodiment has irregularities formed in the form of single embossing, the value of MMD, which is an index indicating the surface property, is higher on the back surface (convex forming surface) than on the front surface (concave forming surface). ) Is higher. Within the range of this MMD, the smoothness can be felt without feeling the roughness as toilet paper at the time of use. Moreover, since the MMD value is superficial, it is affected by the unevenness due to embossing. If it is a toilet roll with uneven tissue paper wrapped by embossing in this range, you will feel the softness when you hold it in your hand. In addition, the toilet papers that make up each layer in the rolled state are rubbed against each other appropriately, wrinkles and embossing are less likely to occur during manufacturing, and the sharpness of embossing and wrinkles are also excellent. In the measurement of MMD, the measuring device 100 shown in FIG. 4 is used, and the contact surface of the friction element is brought into contact with the surface of the measurement sample to which a tension of 20 g / cm is applied in a predetermined direction with a contact pressure of 25 g. , Move 2 cm at a speed of 0.1 cm / s in the same direction as the tension is applied, and use the friction tester KES-SE (manufactured by Kato Tech Co., Ltd.) or its equivalent to set the coefficient of friction at this time. To measure. The value obtained by dividing the coefficient of friction by the friction distance (moving distance = 2 cm) is MMD. The friction element shall have 20 piano wires P having a diameter of 0.5 mm adjacent to each other and having a contact surface formed so as to have both a length and a width of 10 mm. It is assumed that a unit bulging portion having a tip formed by 20 piano wires P (curvature radius 0.25 mm) is formed on the contact surface.

Further, the toilet paper according to the present embodiment has a Krem water absorption rate of 33 to 60 mm / 3 minutes, preferably 35 to 50 mm / 3 minutes. If the Krem water absorption is 33 mm / 3 minutes or more, the water absorption is unprecedented among general-purpose products having a winding length of about 55 m with one ply. Regarding the upper limit value, in the case of 1 ply, if it is excessively high, for example, the sense of security when wiping urine or using it in a shower / toilet is reduced. If it is 60 mm / 3 minutes or less, it does not absorb water excessively, and even a 1-ply general-purpose product can be used with confidence. In addition, it is easy to secure water solubility. Here, the Krem water absorption degree according to the present embodiment is measured according to JIS P 8141. The sample shall have a width of 15 mm and a length of 200 mm or more according to JIS P 8141, but the measurement time is specified as 10 minutes in JIS P 8141, but this Krem water absorption is measured in 3 minutes and 3 It is the permeated distance after the lapse of minutes. This is because toilet paper is highly hydrolyzable and may not be hydrolyzed and measured by immersion for 10 minutes, and in actual use of toilet paper, it is much shorter than 10 minutes, specifically about 3 minutes at most. This is because the amount of water absorbed up to is important. In addition, the Krem water absorption in a short time of 3 minutes is also affected by the unevenness of the embossing process. In the embossed unevenness, the fibers are strongly compressed in the deep and clear recesses, and the fibers are weakly compressed in the shallow and unclear recesses. Since the fiber density differs depending on the sharpness and depth of embossing, the Krem water absorption in a short time becomes different.

Further, in the toilet paper according to the present embodiment, it is desirable that the number of permeated sheets when 100 μL of water is dropped is 9 or more. In this measurement of the number of permeated sheets, a plurality of sheets of toilet paper are stacked only by their own weight, 100 μL of water is dropped from 10 mm above the toilet paper at the uppermost position, and the permeation into the lowermost layer is confirmed immediately after the dropping. Start with a small number of layers, increase the number of layers until penetration cannot be confirmed, and measure the maximum number of sheets for which penetration can be confirmed. If it exceeds 9, it can be said that the water permeates extremely quickly.

Further, it is desirable that the toilet paper according to the present embodiment has a water absorption capacity of 0.72 mL or more at a ^{basis weight of 21.5 g / m 2 or less.} Furthermore, at a basis weight 21.5 g / m ² Ultra 21.9 g / m ² or less of the range, or 0.68 mL, is more than 0.62mL at 21.9 g / m ² Ultra 22.3 g / m ² or more ranges Is desirable. As the basis weight increases, the water absorption capacity may decrease, but it can be said that the water absorption capacity is excellent within the above range.

Here, as for the water absorption capacity, 20 sheets of toilet paper were used as a sample, and water was dropped onto a point on the sample at a constant speed, and the sample could not hold the water and penetrated to the surface opposite to the dropping surface. This was a test to confirm the amount of dripping when it was detected by the detector. Specifically, 20 sheets of toilet paper are stacked and fixed in a laminated state with a sample presser. Then, water is dropped from a position 10 mm above the sample at 10 ± 2 mL / min on one side of the sample. A water detection device is placed at a position below the sample and in contact with the sample, and the amount of water dropped when the detection device detects that water has permeated the sample is defined as the water absorption capacity.

On the other hand, it is desirable that the toilet roll according to the present embodiment has a winding hardness of 0.80 to 1.40 kgf. The winding hardness according to the present invention is necessary for winding a diaphragm rule (Muratec-KDS Co., Ltd. and its equivalent machine) around a toilet roll and pulling it by three scales with a push-pull gauge (Imada Co., Ltd. and its equivalent machine). It is a value obtained by measuring the force. If the winding hardness is 0.80 to 1.20 kgf, it is hard to feel that it is hard compared to the winding length. With the above configuration according to the present invention, it is easy to adjust to this winding hardness.

On the other hand, the toilet roll according to the present embodiment preferably has a winding density of 0.83 to 0.92. The winding density is a value calculated by dividing the actual cross-sectional area by the theoretical cross-sectional area. The actual cross-sectional area is a value calculated by multiplying the winding length by the paper thickness. On the other hand, the theoretical cross-sectional area is a value calculated by (winding diameter / 2) × (winding diameter / 2) × π- (paper tube outer diameter / 2) × (paper tube outer diameter / 2) × π. .. That is, it is the area obtained by subtracting the area on the end side of the paper tube opening from the area of the end face. When the winding density is in the range of 0.83 to 1.10, when the roll is held in the hand on the peripheral surface, it becomes hard to feel that it is hard compared to the winding length. In particular, when it exceeds 1.10, it begins to feel excessive hardness, and when it exceeds 0.96, it becomes felt as a hard-wound and tight roll. On the other hand, if it is less than 0.83, there is a risk that the core edge of the roll will pop out from the end face.

Next, a method for manufacturing the toilet roll of the present embodiment will be described. The method for manufacturing a toilet roll of the present embodiment includes a papermaking process for obtaining a base paper and a winding process for winding the base paper with a winder device. Hereinafter, each step will be described.

[Papermaking process]
The paper making process in the present embodiment can be performed by a paper machine for crepe paper by the dry crepe method. First, in the papermaking process, the pulp slurry is prepared. The freeness of this pulp slurry is appropriately adjusted between 410 and 680 cc.

In the pulp slurry of the present embodiment, the fiber raw material is 70 to 100% by mass of virgin pulp. Other fiber raw materials such as used paper pulp can be contained in an amount of 0 to 30% by mass. It is particularly desirable that the amount of virgin pulp is 100% by mass because it is easy to adjust the texture such as softness and smoothness and the paper strength. However, when recycled paper pulp is blended, there is an advantage that it can be produced at a lower cost than a pulp made of 100% by mass of virgin pulp. Further, in the process of regenerating pulp from recycled paper, the fibers of used paper pulp tend to be finer than the pulp fibers before regeneration, and due to the nature of such fibers, the fibers can be made without increasing the paper thickness. It becomes dense and the paper power can be increased. On the other hand, if it is mixed excessively, the texture such as flexibility will decrease. Therefore, in consideration of the characteristics of the recycled paper pulp, the blending ratio may be determined in the range of 0 to 30% by mass. The type of used paper pulp is not necessarily limited, but milk carton used paper and used paper pulp made from high-quality used paper are particularly desirable. Since these contain a large amount of hardwood kraft pulp (LBKP) derived from raw materials, it is easy to develop paper strength.

The virgin pulp is preferably softwood kraft pulp (NBKP) and hardwood kraft pulp (LBKP). It is desirable that the blending ratio of these is NBKP: LBKP of 20:80 to 50:50.

Next, the pulp slurry is supplied with a softener of 0.9 to 1.0 kg / pulp t, a moisturizer of 1.4 to 1.6 kg / pulp t, and a viscous agent of 0.45 to 0.55 kg / pulp t. .. However, the softener, the moisturizer, and the viscous agent do not need to be supplied at the same time, and can be separately supplied at an appropriate position in the stage before the papermaking raw material is discharged to the papermaking net. Preferably, the softener is supplied in the mixing tank and the moisturizer is supplied in the seed box. The viscous agent is supplied prior to these. By blending the softener and the moisturizer in the above ratio, the softness of the toilet paper is improved, and further, unevenness due to embossing is easily formed.

The softener, moisturizer and slime can be appropriately selected from the internal softener used in the production of toilet paper, the internally added moisturizer, and the softener for pulp slurry. Examples of the softening agent include fatty acid ester-based softeners disclosed in US Pat. No. 3,296,065 and quaternary ammonium salt-type cationic surfactants disclosed in JP-A-48-222701. Non-cationic surfactants disclosed in JP-A-2-99690, JP-A-2-99691, etc., urethane alcohols disclosed in JP-A-60-139897, etc., or salts or cationized products thereof. One or more of the polyphosphates disclosed in JP-A-2-36288, etc., the polysiloxanes disclosed in JP-A-2-224626, JP-A-3-900, etc. are appropriately selected. Can be used. Preferably, a nonionic surfactant having an alkyl group and / or an alkenyl group (component A) and a cationic surfactant having an alkyl group and / or an alkenyl group (component B) are included. In the latter case, it is particularly desirable that the nonionic surfactant (component A) has an alkyl group having 6 to 24 carbon atoms and / or an alkenyl group having 6 to 24 carbon atoms as a hydrophobic portion. If the carbon number of the component A is less than 6, the softening effect may not be enhanced, and if the carbon number exceeds 24, the dispersibility when added to the papermaking system may be deteriorated.

Examples of the moisturizer include cationic polyethylene emulsions and fatty acid amides.

Further, as the thickener, a polyethylene oxide-based thickener is preferable because the formation can be further enhanced.

In particular, in the adjustment of the papermaking raw material in the papermaking process of the present embodiment, it is preferable to use a slightly large amount of adhesive. As a result, the dry tensile paper force is strengthened, the tension (draw) in the winder can be lowered, the speed at the time of embossing can be slowed down, and clear unevenness can be formed. On the other hand, a little more softener and a little less moisturizer are used. As a result, the hardness of the paper due to the viscous agent is reduced, the softness of the embossed toilet paper and the softness of the toilet roll are easily exhibited, and wrinkles are less likely to occur during manufacturing.

The papermaking speed (papermaking speed) when the base paper is made is preferably set to a papermaking speed of 850 to 920 m / min. It is possible to secure sufficient time for the fibers to become familiar with each other and for the effects of chemicals such as fabric softeners to appear.

The wet paper in the papermaking process can be dried with a drum dryer. The dry paper dried by the drum dryer is creped by a creping doctor, appropriately calendar-processed, and then wound up and processed into a raw fabric roll. Here, in the present embodiment, the crepe is formed with the cutting edge angle of the crepe doctor at 89 to 91 ° during crepe. The bevel angle may be 17 to 19 °. The crepe rate is about 19 to 22%. By increasing the cutting edge angle of the crepe doctor, a firm crepe is formed on the base paper, and by using a thick base paper, the toilet paper has clear irregularities during embossing.

The dry tensile strength of the base paper may be about 1.1 to 1.3 times that of the toilet paper in order to secure the dry tensile strength of the toilet paper when it is used as a toilet roll.

[Rolling process]
The winding step in this embodiment can be performed by a winder device incorporating embossing equipment. In the present embodiment, the base paper unwound from the original roll is processed on a long paper tube having a length of more than one times the product width of the toilet roll manufactured prior to or in parallel with the winding process. After that, it is wound to form a log, which is an intermediate product having the same diameter as the diameter of the final product toilet roll and having a width equal to a plurality of the final product.

In this winding process, the original roll obtained by winding the base paper obtained in the papermaking process is set in the winder device. In the winder device, the base paper unwound from the raw roll is first embossed. The embossing in the present embodiment is a single embossing by a steel rubber method. The steel rubber method is an embossed roll made by passing a base paper between a metal embossed roll having a convex portion corresponding to the embossed pattern on the surface and a rubber roll whose surface is made of resin. Embossing roll This is an embossing method that transfers the embossing pattern of the peripheral surface to the base paper by pressing the peripheral surface against the base paper. In this case, a concave portion is formed on the surface of the base paper facing the embossed roll, and a convex portion corresponding to the concave portion is formed on the surface in contact with the rubber roll.

The height of the convex portion formed on the embossed roll may be appropriately adjusted according to the embossing depth, but is preferably 1.2 to 1.5 mm. The shore hardness (Shore hardness) of the rubber roll can be adjusted in an appropriate range, but in the present embodiment, a rubber roll using a material having a slightly high shore hardness of more than 60, more preferably more than 70 is used. It is desirable to emboss. In the comparative example, a rubber roll having a shore hardness of 45 to 50 is used. In general, increasing the shore hardness of the rubber roll leads to blurring of the embossing, but if the material is low, the rubber roll will be deformed and the embossing will not be properly inserted. In the present invention, the shore hardness of the rubber roll is appropriately increased so that the unevenness due to the embossing process becomes continuously clear.

In the present embodiment, the embossing pattern of the embossing roll is not necessarily limited, but as described above, the area of the recess is 1.0 to 2.5 mm ² , the density is 0.01 to 0.5, and the embossing is performed. It is preferable that the unevenness is formed at a depth of 0.02 to 0.5 mm. The softness of the toilet paper is improved, and the softness in the rolled state is increased like a toilet roll, which makes it easier for consumers to feel soft when held in their hands, and the unevenness due to embossing is not crushed and is clear. It will also be excellent. In particular, it is preferable that the pattern shown in FIG. 2 described above is transferred. The tension at the time of winding is dispersed, and the unevenness due to embossing becomes extremely clear in the winding length of the toilet roll according to the present invention, and wrinkles and the like are less likely to occur. In addition, the softness of the toilet paper itself and the wiping property of stool are also excellent. The embossing depth is an average value of the depths of the recesses.

The base paper whose unevenness is formed by embossing is wound around a long paper tube having an outer diameter of 35 to 45 mm by a surface winding method. The winding length is 54.5 to 56.7 m so as to be the toilet roll of the present embodiment. At this time, the tension is adjusted so that the winding diameter is 104 to 108 mm. Here, when manufacturing the toilet roll of the present embodiment, it is preferable to adjust the draw value between the winding belt and the drum. This draw value is a value calculated by {(winding belt speed)-(winding drum speed)} / (winding belt speed). That is, it represents the level of tension at the time of winding. By adjusting the draw value, the processing speed during embossing can also be adjusted. In this embodiment, the draw value is 5.0% or less, preferably 3.0% or less. By setting the draw value to 5.0% or less, the speed during embossing can be slowed down to form clear irregularities, and wrinkles and crushing of irregularities during winding can be preferably prevented.

Prior to winding, the perforation line of sight can be imparted by the perforation line-of-sight forming portion provided with the perforation roll incorporated in the winder device.

As described above, once the log is manufactured, the log is cut into product widths by the log cutter equipment in the subsequent stage to make individual toilet rolls.

Next, in Examples and Comparative Examples of the toilet roll of the present invention, the softness of the roll, the softness of the paper (toilet paper), the smoothness, the moist feeling, the thickness feeling, and the sharpness of the embossed unevenness were tested. Furthermore, a plurality of Examples and Comparative Examples having different basis weights were produced and tested for the Krem water absorption degree, the number of permeated sheets of 100 mL of water, and the water absorption capacity.

In addition, each Example and each Comparative Example are embossed with the pattern shown in FIG. 2B (diagonal distance 1.0 × 1.0, pitch 5.0 mm). The composition of the toilet roll and the physical properties and composition of the toilet paper according to each example are as shown in Tables 1 and 2 below.

In the sensory evaluation, 18 subjects actually used the toilet roll according to each example for one week, and "roll softness", "paper softness", "paper smoothness", "paper moist feeling". , "Paper thickness" and "Clearness of unevenness" were evaluated. The evaluation was 4 points for the comparative example, 5 points that were better than the comparative example, 4 points that were about the same as the comparative example, 3 points that were slightly better for the comparative example, 2 points that were better for the comparative example, and very much for the comparative example. It was decided to give a score as a good one and calculate the average value to make a judgment. In the embossing sharpness test, the evaluator visually judges whether or not the unevenness is clear from the beginning to the end of winding.

Further, the methods for testing the Krem water absorption degree, the number of permeated sheets of 100 mL of water, and the water absorption capacity are as described above. The Krem water absorption is a value obtained by calculating an average value of 5 times for each sample No. The results are shown in Table 2. The Krem water absorption is the permeation distance 3 minutes after the start of measurement according to JIS P 8141. The number of permeated sheets of 100 mL of water started from 5 sheets, and the number of sheets was increased. In terms of water absorption, the sample retainer is an annular frame, and has a sufficient dropping portion so that the water dropped in the central portion does not penetrate into the frame.

As shown in Table 1, the examples according to the present invention gave better results than the comparative examples in all sensory evaluations. In addition, as for the water absorption capacity, the amount of water retained decreases as the basis weight increases in both Examples and Comparative Examples. It is considered that this is because the toilet paper having irregularities due to the embossing is pressed by the embossing, so that the paper tends to become denser in the thickness direction when the basis weight is high. However, as shown in FIG. 5, it can be seen that the examples have higher water absorption capacity at the same basis weight than the comparative examples. Moreover, in the test of the number of permeated sheets and the water absorption of Krem, the results of the comparative examples were better than those of the examples.

To sum up these results, the toilet roll according to the present invention has excellent roll softness, is less likely to cause crushing and wrinkles due to embossing when the toilet roll is held, and further, the unevenness is clear due to embossing. It is excellent in water absorption performance of toilet paper.

1 ... Toilet roll, 10 ... Toilet paper, 20 ... Paper tube (tube core), L1 ... Toilet roll winding diameter (diameter), L2 ... Toilet roll tube core diameter, L3 ... Toilet roll width, 31, 32 ... recess, 33 ... valley line.

Claims (3)

The paper thickness is 120 to 150 μm, the dry tensile strength in the MD direction is 190 to 310 cN / 25 mm, the dry tensile strength in the CD direction is 60 to 120 cN / 25 mm, and the embossed 1-ply toilet paper has an outer diameter. A toilet roll characterized in that a length of 54.5 to 56.7 m is wound around a pipe shaft of 35 to 45 mm and a winding diameter is 104 to 108 mm. The embossing pattern on toilet paper is
A square with a bottom surface of 1.0 to 1.5 x 1.0 to 1.5 mm or a concave portion forming a substantially square in which the squares of the square extend diagonally outward is centered on the entire surface of the paper. It is arranged in a grid pattern with an arrangement angle of 45 ° with respect to the width direction at 4.5 to 5.5 mm, and
The toilet roll according to claim 1, wherein the recess has a valley line portion extending from each of the four sides of the recess between the recesses. The toilet roll according to claim 1 or 2, wherein the toilet paper contains a softener, a moisturizer, and a viscous agent.

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