WO2018073985A1

WO2018073985A1 - Toilet roll

Info

Publication number: WO2018073985A1
Application number: PCT/JP2017/003136
Authority: WO
Inventors: 康伸大岡; 大篭　幸治
Original assignee: 日本製紙クレシア株式会社
Priority date: 2016-10-17
Filing date: 2017-01-30
Publication date: 2018-04-26
Also published as: JP2018064665A; JP6186484B1

Abstract

The purpose of the present invention is to provide a toilet roll that is comparable to conventional products in terms of the basis weight of toilet paper, is excellent in terms of the softness of a sheet, has a long length per roll, has a good embossed aesthetic appearance, and is excellent in terms of ease of carrying and space-saving for storage. The present invention provides a toilet roll wherein laminated two-ply toilet paper having an embossed pattern formed thereon is wound into a roll. The toilet roll has a roll length of 63-105 m, a roll diameter of 105-140 mm, a roll softness of 0.4-1.9 mm, and a ratio [(D2/D1)×100] between a depth D2 (mm) of the embossed pattern and a depth D1 (mm) of the embossed pattern of 45-100%.

Description

Toilet roll

The present invention relates to a toilet roll in which toilet paper laminated in two plies is wound into a roll.

Toilet rolls are mainly marketed by packaging 4 rolls or 12 rolls as one set. Since packaged toilet rolls are bulky, the number of toilet rolls that can be carried at the time of purchase is limited, and the amount that can be purchased at one time is limited due to such restrictions. In addition, toilet rolls may be stored at home, work, public facilities, etc., but a large storage space cannot always be secured.

Under such circumstances, other toilet rolls have been proposed in which the basis weight per sheet of toilet paper is reduced to 14 g / m ² or less and the winding length per roll is increased (for example, Patent Document 1 and 2), a toilet roll having a longer winding length has been developed while increasing the basis weight per toilet paper to be greater than 13 g / m ² to improve the texture and feeling of use (for example, see Patent Document 3). .

JP 2006-087703 A JP 2013-208297 A JP 2014-188342 A

However, generally, when the basis weight of the toilet paper is lowered, the strength is lowered and the feeling of use and bulkiness are also lowered. On the other hand, if the calendar process is weakened for the purpose of making the toilet paper bulky to make up for these problems, there is a problem that the roll diameter becomes large and it becomes difficult to fit in the toilet paper holder, or the smoothness is inferior.

Also, while increasing the roll length of the toilet roll, it is necessary to increase the roll density in order to avoid an increase in the winding diameter and to prevent the toilet roll holder from being attached. However, in this case, there is a problem that excessive press is applied to the inner roll toilet paper in particular, and the embossing provided on the inner roll toilet paper is crushed, resulting in poor cosmetic properties during use.

Therefore, according to the present invention, the basis weight of the toilet paper is the same as that of the conventional product, the sheet is excellent in softness, the winding length per roll is long, the cosmetic embellishment by embossing is excellent, the portability and the storage saving. It aims at providing the toilet roll excellent in space property.

The inventors of the present invention have conducted intensive research to solve the above problems. As a result, in the toilet roll provided with an embossed pattern on the toilet paper in order to improve the softness and beauty of the sheet, the ratio of the depth of the embossed pattern between the outer roll and the inner roll of the toilet roll is within a predetermined range. By adjusting various conditions, it was found that the cosmetics of the toilet paper can be maintained and the roll length of the toilet roll can be increased while the roll diameter can be avoided, and the present invention has been completed. Specifically, the present invention provides the following.

(1) A first aspect of the present invention is a toilet roll obtained by winding a toilet paper layered on two plies and provided with an emboss pattern into a roll shape, the winding length being 63 m or more and 105 m or less, and the winding diameter is The ratio of the embossed pattern depth D1 (mm) to the embossed pattern depth D2 (mm) {(D2 / D1) × 100} is 105 mm to 140 mm, the roll softness is 0.4 mm to 1.9 mm. Is a toilet roll that is 45% or more and 100% or less.

[Here, the depth D1 of the emboss pattern is the depth of the emboss pattern at a position corresponding to 10% of the roll length of the toilet roll from the edge of the outermost roll of toilet paper when the toilet roll is unwound. The emboss pattern depth D2 is the depth of the emboss pattern at a position corresponding to 90% of the roll length of the toilet roll from the edge of the outermost roll of toilet paper when the toilet roll is unwound. ]

(2) A second aspect of the present invention is the toilet roll according to (1), wherein the embossing pattern depth D1 is 0.01 mm or more and 0.40 mm or less, and the embossing pattern depth D2 is 0. .01 mm or more and 0.35 mm or less.

(3) A third aspect of the present invention is the toilet roll according to (1) or (2), wherein the embossed pattern is a single embossed pattern.

(4) A fifth aspect of the present invention is the toilet roll according to any one of (1) to (3), wherein the toilet paper contains kraft pulp in an amount of 40% by mass or more and less than 100% by mass. It is a feature.

(5) The sixth aspect of the present invention is the toilet roll according to any one of (1) to (4), wherein the waste paper pulp derived from milk carton is contained in an amount of more than 0% by mass and less than 60% by mass. It is characterized by.

(6) A seventh aspect of the present invention is the toilet roll according to any one of (1) to (5), wherein the C light source defined by the CIE (International Commission on Illumination) is provided on the surface side of the toilet paper. Whiteness conforming to ISO 2470 when irradiated on the surface side of toilet paper through a filter that cuts off UV light with a wavelength of 420 nm or less, and whiteness UV-in conforming to ISO 2470 when irradiated The difference Δ with respect to UV-cut is 0.0 point or more and 2.5 points or less.

According to the present invention, the basis weight of toilet paper is maintained at the same level as that of conventional products, the sheet is excellent in softness, the winding length per roll is long, and the cosmetic properties by the embossed pattern are maintained. A toilet roll excellent in space saving can be provided.

It is a perspective view which shows the external appearance of the toilet roll which concerns on 1st embodiment of this invention. It is a figure which shows the picked-up image of the emboss pattern on the roll surface side. It is sectional drawing which shows the embossing pattern provided in the roll surface and the back surface. It is a figure which shows the measuring method of the depth of an embossing pattern. It is a figure which shows the measuring method of the depth of an embossing pattern. It is a figure which shows the measuring method of the depth of an embossing pattern. It is a figure which shows the measuring method of the depth of an embossing pattern. It is a figure which shows an example of a machine winder. It is a figure which shows an example of a roll winding processing machine. It is drawing which shows the picked-up image of the inferior goods which the inner winding side of the roll protruded in the axial direction. Schematic positions corresponding to 10% and 90% of the roll length of the toilet roll from the edge of the outermost roll of toilet paper when unwinding the toilet roll, specified when measuring the depth of the embossed pattern It is drawing shown in. It is drawing which shows typically a mode that arbitrary 10 embossing is selected when measuring the depth of an embossing pattern.

Hereinafter, embodiments of the present invention will be described in detail. However, the following embodiments are presented for illustrative purposes, and the present invention is not limited to the embodiments described below.

<Toilet roll>
The toilet roll 1 of the present invention is a toilet roll 1 in which toilet paper 1x laminated with two plies and provided with an emboss pattern is wound into a roll shape, and the winding length (winding length) is 63 m or more and 105 m or less. The winding diameter DR (outer diameter of the roll) is 105 mm or more and 140 mm or less, the roll softness is 0.4 mm or more and 1.9 mm or less, the embossed pattern depth D1 (mm) and the embossed pattern depth D2 (mm) The ratio {(D2 / D1) × 100} is 45% or more and 100% or less.

Here, the depth D1 of the emboss pattern is the depth of the emboss pattern at a position corresponding to 10% of the roll length of the toilet roll 1 from the edge of the outermost roll of toilet paper when the toilet roll 1 is unwound. The depth D2 of the emboss pattern is the depth of the emboss pattern at a position corresponding to 90% of the roll length of the toilet roll 1 from the edge of the outermost roll of toilet paper when the toilet roll 1 is unwound. It is.

Further, among the surfaces of the toilet paper 1x, the surface directed toward the roll outer side is referred to as a roll surface 1a (the surface of the toilet paper 1x), and the surface directed toward the center of the roll is defined as the roll back surface 1b (or the back surface of the toilet paper 1x). Called.

As a method of adjusting the roll softness of the toilet roll 1 to the above range, there is a method of adjusting the strength of winding the roll with a roll winder (particularly a surface type) while adjusting the basis weight and the paper thickness to a predetermined range.

[Wind length]
Since the roll length of the toilet roll 1 is not less than 63 m and not more than 105 m, the toilet roll 1 can be saved in space, and the roll diameter DR is maintained in an appropriate range, and the toilet roll 1 is sufficient for the toilet paper holder. It will be housed in. The winding length is preferably 68 m or more and 95 m or less, and more preferably 73 m or more and 85 m or less.

[Winding diameter]
When the roll diameter DR of the toilet roll 1 is 105 mm or more and 140 mm or less, the toilet roll 1 is sufficiently accommodated in the toilet paper holder while maintaining the winding length of the toilet roll 1 within a suitable range. The winding diameter DR is preferably 110 mm or more and 132 mm or less, and more preferably 115 mm or more and 123 mm or less.

[Roll softness]
When evaluating the softness of the toilet roll 1 having a long winding length as in the present invention, the softness when the roll is held in the hand can be evaluated by evaluating the roll softness described below.

The roll softness of the toilet roll 1 is measured as follows using a compression tester (a handy compression tester KES-G5 manufactured by Kato Tech Co., Ltd.). In addition, let the direction parallel to the axial center of the toilet roll 1 be a height direction, and let the direction perpendicular | vertical to the tangent of the circumference of the toilet roll 1 be a radial direction.

First, an acrylic pipe is inserted into the core of the toilet roll 1. The wall thickness of the acrylic pipe is 2 mm. The length of the acrylic pipe is 10 mm longer than the roll width of the toilet roll 1 (when the roll width of the toilet roll 1 is 114 mm, the length of the acrylic pipe is 124 mm). The outer diameter of the acrylic pipe is slightly smaller than the inner diameter of the core of the toilet roll 1, and when the acrylic roll is placed so that the axis of the toilet roll 1 is vertical after insertion, the toilet roll does not move by its own weight. Magnitude. When it is difficult to insert the acrylic pipe into the core and the outer diameter of the acrylic pipe is slightly reduced, the wall thickness may be slightly reduced with water-resistant paper or the like. The mass of the acrylic pipe is about 31 g when the length is 125 mm and the outer diameter is 38 mm.

Next, the toilet roll 1 is placed on a hard table so that the axis is horizontal. Then, the KES-G5 compressor (contact area 2.0 cm ² ) is pushed into the center of the toilet roll 1 in the radial direction from above in the radial direction under the condition of a speed of 10 mm / min. Let T0 be the indentation depth when the pressure at which the compressor pushes the roll is 5 gf / cm ² , Tm be the indentation depth when the pressure is 150 gf / cm ² , and let (Tm−T0) be the roll softness. The measurement is performed 5 times, and the measurement results are averaged. In addition, the position of the height direction at the time of pushing the said compressor into the toilet roll 1 does not need to be a center part of a height direction except the both ends of a height direction. In the measurement of the roll softness of the toilet roll 1 of the present invention, the measurement is performed by pressing the above-mentioned compressor near the middle between the center portion and the end portion of the toilet roll 1 in the height direction.

The roll softness of the toilet roll 1 of the present invention is 0.4 mm or more and 1.9 mm or less, more preferably 0.5 mm or more and 1.5 mm or less, and preferably 0.6 mm or more and 1.1 mm or less. Further preferred.

[Winding density]
In the present invention, the winding density of the toilet roll 1 is preferably 1.1 m / cm ² or more and 2.0 m / cm ² or less. Here, if the roll is too tightly wound, excessive pressing is applied to the inner roll toilet paper 1x, and the embossing provided on the inner roll toilet paper 1x is crushed, resulting in a decrease in cosmetics when used. On the other hand, if the roll is wound too weakly, the emboss will not be crushed, but the winding diameter will increase, making it difficult to attach the toilet roll 1 to the toilet paper holder, and the winding force of the inner volume will be too weak. As shown in the photograph in FIG. 10, the inner winding side of the roll protrudes in the axial direction, resulting in a defective product. For this reason, in this specification, the winding density is defined as a factor for expressing the winding strength of the roll.

The winding density is expressed by (winding length × number of plies) ÷ (roll cross-sectional area). The cross-sectional area of the roll is represented by {the cross-sectional area of the outer diameter (winding diameter DR) portion of the roll} − (the cross-sectional area of the core outer diameter portion). The core outer diameter DI is the diameter of the center hole of the roll.

For example, when the winding length is 75 m, 2 plies, the winding diameter is 117 mm, and the outer diameter of the core is 39 mm, the winding density = (75 m × 2) ÷ {3.14 × (117 mm ÷ 2 ÷ 10) ² −3.14 × (39 mm ÷ 2 ÷ 10) ² } = 1.57 m / cm ² . When the toilet roll 1 has no core, the diameter of the center hole is set as the core outer diameter.

When the winding density is 1.1 m / cm ² or more and 2.0 m / cm ² or less, the winding diameter DR is positioned in an appropriate range, and the toilet roll 1 can easily fit in the toilet paper holder or the like. The winding force of the winding becomes appropriate, the inner winding side of the roll protrudes in the axial direction (poor shape retention of the roll is inferior), it does not become a defective product, and the softness of the sheet is suitably maintained, The cosmetics at the time of use are maintained, without the embossing provided in the toilet paper 1x being crushed. The winding density is preferably 1.2 m / cm ² or more and 1.9 m / cm ² or less, and more preferably 1.5 m / cm ² or more and 1.8 m / cm ² or less.

[Basis weight]
The basis weight per sheet of toilet paper 1x is preferably 13.0 g / m ² or more and 19.0 g / m ² or less, and the paper thickness at this time is 0.45 mm / 10 or more and 1.20 mm / m ² or less. The number is preferably 10 or less. When the basis weight and the paper thickness are within the above ranges, it is easy to adjust the winding hardness, winding length, winding diameter DR, winding density, and roll softness to the above ranges. To adjust the basis weight and paper thickness per toilet paper 1x to the above range, the base paper web calendar conditions (paper thickness and specific volume after calendar processing, paper thickness difference before and after calendar processing) and embossing conditions are The method to prescribe | regulate can be mentioned.

When the basis weight and the paper thickness per sheet of the toilet paper 1x are within the above ranges, the strength and feeling of use (bulkiness) of the toilet paper 1x are suitably maintained, and the toilet roll 1 The winding diameter DR is also maintained in an appropriate range, so that it is easy to fit in the toilet paper holder. The basis weight per one sheet of toilet paper 1x is more preferably 13.5 g / ^{m 2} or more 17.0 g / ^{m 2} or less, is 14.1 g / ^{m 2} or more 16.0 g / ^{m 2} or less More preferably. The thickness of the toilet paper 1x is more preferably 0.55 mm / 10 or more and 1.05 mm / 10 or less, and further preferably 0.65 mm / 10 or more and 0.90 mm / 10 or less.

[Emboss pattern]
The toilet roll 1 (toilet paper 1x) of the present invention is embossed and has an emboss pattern. As an emboss pattern which toilet paper 1x of the present invention has, a single emboss pattern is preferred. As shown in FIG. 3, the single emboss pattern is formed by pressing the embossed convex portion of the embossing roll 111 only from one surface of the toilet paper 1x in which sheets are laminated in two plies.

FIG. 3 is a cross-sectional view showing a single embossed emboss pattern 2 provided on the toilet roll 1 (toilet paper 1x). In the example of FIG. 3, the toilet paper 1x is formed by laminating sheets on two plies, and the upper side of FIG. 3 corresponds to the roll surface 1a side. An embossing pattern 2 (single embossing pattern) is formed in which the concave portion 2R appears on the surface (front surface in FIG. 3) of the toilet paper 1x against which the embossing roll 111 is pressed, and the convex portion 2P appears on the back surface. 3A is a diagram when the depth of the emboss pattern is deep, and FIG. 3B is a diagram when the depth of the emboss pattern is shallow.

In this case, the paper thickness t2 of the toilet paper 1x after the embossing process (this paper thickness reflects the distance between the non-embossed portion on the front surface of the toilet paper 1x and the convex portion 2P on the back surface) is the same. However, the sheet in which the base paper is thinned to the paper thickness t1 by the calendar process and embossed so that the depths D1 and D2 of the embossed pattern are deepened is softer and the texture is superior. This is considered to be because the embossed unevenness in FIG. 3A is higher in bulk with respect to the paper thickness of the base paper (lower in density), easily deforms, and improves the softness of the sheet. .

Further, in the case of FIG. 3A, in order to deepen the depths D1 and D2 of the emboss pattern, it is necessary to reduce the paper thickness t1 per sheet by that amount and make the unevenness remarkable. The softness of the sheet is improved due to the strong calendering of the base paper. On the other hand, if the surface of the toilet paper 1x is made smooth without providing an emboss, the surface is too smooth and the surface feels crisp, and the softness of the sheet is inferior. In addition, when the recessed portion 2R of the emboss is provided on the outside of the roll (the roll surface 1a side) where water easily adheres to the toilet paper 1x when using the warm water washing toilet seat, etc. The softness of the sheet is improved. FIG. 2 shows a photographed image of the embossed recess 2R on the roll surface 1a side.

In addition, when double embossing is performed instead of the single embossing of FIG. 3, after embossing each sheet | seat of the front surface and the back surface side of toilet paper 1x, it is ply | facing with the convex surfaces of each sheet | seat embossing inside. Up to 2 plies. Therefore, the paper thickness t2 of the toilet paper 1x becomes too high, the winding density becomes low, and it may be difficult to secure the winding length. Even in the double embossed pattern, if the depth D1 and D2 of the embossed pattern is reduced, the paper thickness t2 is reduced, but the sheet may be inferior in softness. Therefore, a single emboss pattern is preferable. When a double emboss pattern is formed, ply bond glue (glue) or knurling (edge emboss) is used when two plies are stacked. For this reason, the single embossed pattern 2 is preferable also from the viewpoint that two-ply lamination can be performed without using ply bond glue or knurling.

In addition, the means for ensuring the softness of the toilet paper 1x (sheet) is not limited to embossing, and as long as the surface is provided with unevenness, for example, an uneven fabric is used to make the web uneven during papermaking. May be. In this case, the depth of the unevenness may be set to a range corresponding to the depths D1 and D2 of the emboss pattern to be described later.

(Embossed pattern depth D1, D2)
In the present invention, as a factor for expressing the winding strength of the roll, by defining the difference in the depth of the embossing pattern between the outer winding and the inner winding of the roll, the embossing is not crushed and the winding diameter is not increased. I have to. Specifically, the ratio {(D2 / D1) × 100} of the depth D1 (mm) of the emboss pattern and the depth D2 (mm) of the emboss pattern is set to 45% or more and 100% or less. The ratio is preferably 55% or more and 100% or less, and more preferably 65% or more and 100% or less.

Here, as shown in FIG. 11, the depth D1 of the emboss pattern corresponds to 10% of the wound length of the toilet roll 1 from the edge 1e of the outermost wound toilet paper when the toilet roll 1 is unwound. This is the depth of the recess 2R of the embossed pattern 2 at the position M1, and the embossed pattern depth D2 is 90% of the roll length of the toilet roll 1 from the edge 1e of the outermost wound toilet paper when the toilet roll 1 is unwound. % Is the depth of the recess 2R of the embossed pattern 2 at the position M2 corresponding to%. For example, when the winding length is 75 m, the position M1 is a portion from the edge 1e to 7.5m, and the position M2 is a portion from the edge 1e to 67.5m.

When the above ratio is 45% or more and 100% or less, the inner roll toilet paper 1x is not excessively pressed, and the embossed pattern 2 provided on the inner roll toilet paper 1x is used without being crushed. At the same time, the balance of the cosmetics becomes good, the attachment to the toilet paper holder becomes easy, the shape retaining property of the roll is inferior, and the defective product in which the inner winding side protrudes in the axial direction does not occur.

The depth D1, D2 of the emboss pattern is obtained by measuring the height difference of the emboss pattern using a microscope.

The product name “One-shot 3D measurement macroscope VR-3100” manufactured by KEYENCE can be used as the microscope. The product name “VR-H1A” can be used as a microscope image observation / measurement / image analysis software. Measurement is performed under the conditions of a magnification of 12 times and a visual field area of 24 mm × 18 mm. In addition, you may change a measurement magnification and a visual field area suitably according to the magnitude | size of the embossing pattern calculated | required.

First, as shown in FIG. 4, the longest part a of the fringe fr of the emboss pattern is obtained. FIG. 5A shows a height profile on the XY plane by a microscope, and it can be seen that the height of the surface of the toilet paper 1x is expressed by shading. 5A shows individual emboss patterns, and the longest part a of one emboss pattern can be distinguished from FIG. 5A. When a line segment AB that crosses the longest portion a is drawn, a height (measured cross-section curve) profile of the emboss pattern is obtained as shown in FIG. Here, since the convex portion (non-embossed portion) and the concave portion of the embossed pattern can be recognized by the color density of the XY plane image, the line segment AB is crossed so that the convex portion and the concave portion are adjacent to each other. Just decide.

Here, the height profile in FIG. 5 (b) is a (measurement) cross-sectional curve T representing the unevenness of the sample surface of the actual toilet paper 1x, but there is noise (a fiber lump on the surface of the toilet paper 1x, The fiber also includes a beard-like shape or a steep peak due to a portion having no fiber), and it is necessary to remove such a noise peak when calculating the height difference of the unevenness. Therefore, as shown in FIG. 6, a “contour curve” U is calculated from the cross-sectional curve T of the height profile, and two inflection points P1 and P2 that are convex upward in the contour curve U, and the inflection The minimum value sandwiched between the points P1 and P2 is obtained and set as the minimum value Min of the depth. Further, the average value of the depth values of the inflection points P1 and P2 is set as the maximum value Max.

In this way, the depth D1 of the embossed pattern (the same applies to D2) = maximum value Max−minimum value Min, and the distance (length) on the XY plane of the inflection points P1 and P2 is the length of the longest part a. It prescribes. The “contour curve” is λc: 800 μm from the cross-sectional curve (where λc is a “filter that defines the boundary between the roughness component and the swell component” described in JIS-B0601 “3.1.1.2”). It is a curve obtained by removing the surface roughness component of a shorter wavelength with a low-pass filter. Note that if λc is set to be equal to or larger than the interval P1 between adjacent emboss patterns (this is referred to as an emboss pitch), the peak may be recognized as noise, so λc is set to be less than the emboss pitch. For example, when the emboss pitch is 800 μm or less, for example, λc is set to 250 μm. The P1 interval between adjacent emboss patterns is similarly determined as P1 and P2 for the next emboss pattern connected to the left or right in FIG. 6, and two P1s when adjacent emboss patterns are aligned with P1, P2, and P1. Is the interval.

Similarly, the depth D1, D2 of the emboss pattern is measured for the longest portion b in the direction perpendicular to the longest portion a in FIG. 5A, and the depth D1, of each emboss pattern of the longest portions a, b is measured. The larger value of D2 is adopted as the embossed pattern depths D1 and D2. The above measurement is performed on any ten embossed patterns 2 on the roll surface 1a of the toilet paper 1x, and the average value is adopted as the final embossed pattern depths D1 and D2. Further, the product (a × b) of the longest part a and the longest part b is obtained as the area S of the embossed pattern 2. For the longest part a and the longest part b, values obtained by averaging the values of individual a and b for the ten embossed patterns 2 on the roll surface 1a of the toilet paper 1x described above are used. However, as shown in FIG. 7, when the embossed pattern is connected in the flow direction (MD direction), the longest part a becomes the same as the winding length, the height difference cannot be obtained, and the depth D of the concave portion is set. It cannot be measured. Therefore, the depth D of the recess can be measured by drawing a line segment AB so as to straddle the emboss pattern in the width W direction orthogonal to the direction (MD direction) where the emboss pattern is connected. Similarly, when the emboss pattern is connected in the width W direction (CD direction), a line segment AB is drawn across the emboss pattern in the flow direction (MD direction), and the depth D of the recess is measured.

The embossed area S is preferably 0.2 mm ² or more and 9.0 mm ² or less, more preferably 1.0 mm ² or more and 7.0 mm ² or less, and 1.8 mm ² or more and 5.0 mm ² or less. More preferably. Further, the area ratio of the embossed pattern (ratio of the portion having the embossed pattern in the toilet paper) is preferably 3% to 60%, more preferably 7% to 45%, and more preferably 10%. More preferably, it is 30% or less. When it is difficult to obtain the area ratio of the embossing pattern of the toilet paper, the area ratio of the convex portion of the embossing roll 111 can be set as the area ratio of the embossing pattern. When the embossed area S and the area ratio are within the above ranges, the size of the embossed pattern can be maintained appropriately, and the embossed pattern can have excellent cosmetic properties, winding density, and roll softness. Further, depending on the emboss pattern, the paper thickness may become lower after the embossing process. In this case, the characteristics of the base paper and the calendar processing method are adjusted as appropriate, and the characteristics of the toilet roll 1 and the toilet paper 1x are set to a predetermined value. Can be within a numerical range.

In addition, the shape of the emboss pattern is not particularly limited, such as a rectangle, a square, a round shape, or a long round shape. Moreover, the diameter of a embossing pattern and the area ratio (number) of embossing patterns which were shown above can be adjusted suitably, and a winding diameter and a winding density can be adjusted.

Note that when measuring the depths D1 and D2 of the emboss pattern, the measurement surface is the roll surface 1a side, whether it is single emboss or double emboss. Further, when obtaining the emboss pattern depths D1 and D2 and the emboss area S, any ten emboss patterns 2 are selected as follows. As shown in FIG. 12, for example, when the depth D1 and the embossed area S of the emboss pattern are obtained, the winding length of the toilet roll 1 corresponds to 10% from the edge 1e of the outermost toilet paper 1x of the toilet roll 1. Arbitrary ten patterns are selected from the embossed pattern 2 at the predetermined position M1. At this time, it is not necessary that the center of the embossed pattern 2 passes through the position M1, and the embossed pattern 2 on the position M1 may be placed in the field of view of the above-described microscope to determine the longest portions a and b.

When there are less than 10 embossing patterns 2 on the position M1, the group 2F of the embossing pattern 2 on the outer winding side adjacent to the embossing pattern 2 on the position M1 or the inner side adjacent to the embossing pattern 2 on the position M1. An insufficient number of embosses may be selected from the group 2E of the emboss pattern 2 on the winding side. When the position M1 hits the perforation, the measurement is performed on the group of the embossed pattern 2 on the outer winding side adjacent to the perforation.

The depth D1 of the emboss pattern is preferably 0.01 mm or more and 0.40 mm or less, more preferably 0.04 mm or more and 0.35 mm or less, and further preferably 0.09 mm or more and 0.30 mm or less. preferable. The depth D2 of the emboss pattern is preferably 0.01 mm or more and 0.35 mm or less, more preferably 0.03 mm or more and 0.30 mm or less, and further preferably 0.06 mm or more and 0.25 mm or less. preferable.

When the embossing pattern depths D1 and D2 are within the above range, the degree of unevenness of the embossing pattern is suitably maintained, the bulk of the toilet paper 1x becomes appropriate, and the softness of the sheet is suitably achieved. While being able to maintain, the state which is easy to mount the toilet roll 1 in a toilet paper holder can also be maintained.

FIG. 9 shows an example of a roll winding machine 110. The reel 11 is made into two plies by a ply machine and calendered to become a raw fabric roll 12 (paper thickness t1 of each sheet). The raw roll 12 is set on a roll winding machine 110, subjected to a single embossing process by an embossing unit (embossing roll 111), and then wound by a winding mechanism 113 on a wide base paper roll 13 having the above winding diameter. It is done. Thereafter, the base paper roll 13 is cut into a predetermined width (114 mm or the like) to form the toilet roll 1.

The roll winding machine 110 can be roughly classified into two types: a surface method and a center method. The surface method is a method of winding a roll to be wound while supporting the wound roll from a plurality of other drive rolls from the outside. The wound roll 1 is easy to control the winding diameter, and the production speed is higher. The center method is a method of winding by driving a shaft passing through the center of the winding roll. The wound toilet roll 1 is a relatively soft product and is suitable for a product with delicate embossing. In the present invention, any method can be used for winding, but the surface method is preferred. According to the surface system, the winding diameter and roll softness of the toilet roll 1 can be adjusted relatively easily by the strength with which the toilet roll 1 is wound.

In addition, the machine winder 100 may be incorporated in the roll winder 110, and the roll winder 110 may perform ply-up, calendar processing, and embossing in this order. Alternatively, each hygienic thin paper sheet may be plyed up after the calendar process and embossed.

The depths D1 and D2 of the emboss pattern can be controlled by appropriately adjusting the nip width of the rubber roll 112 (see FIG. 9) facing the emboss roll 111. The nip width varies depending on the roll characteristics, but is preferably 20 mm to 50 mm, more preferably 25 mm to 45 mm, and still more preferably 30 mm to 40 mm. By making the nip width within the above range, the difference between the front and back of the embossed pattern is properly maintained, the paper thickness is suitably maintained, the roll winding diameter DR is appropriate, and the softness of the sheet Is also preferably maintained. The nip width can be measured using carbon paper. As a measuring method, first, the nip of the embossing roll 111 is escaped, and carbon paper and general copy paper are stacked and set. Next, the embossing roll 111 is nipped. Then, let the nip escape and remove the carbon paper and copy paper. Since the color of the carbon paper where the nip is applied by the embossing roll is transferred to the copy paper, the nip width can be measured. In addition, it is preferable that the material of an embossing roll is a metal.

The embossing pattern depths D1 and D2 can be adjusted by narrowing the nip width if the embossing rolls are deep, and increasing the nip width if the embossing rolls are shallow. Further, the strength of winding the roll can be adjusted so as to ensure the depth D of the emboss pattern. For example, when the depth of the embossed pattern is increased, the embossed pattern is easily crushed when the roll is wound. Therefore, the depth D of the embossed pattern can be adjusted by reducing the strength of winding the roll.

At the same time, the roll winder 110 can perform printing, embossing, perforation, tail sealing, and cutting with a predetermined width (114 mm, etc.), and the toilet roll 1 can be manufactured. Furthermore, the package body of the toilet roll 1 can be manufactured by film packaging after that.

[Roll density, roll mass]
The roll mass is the mass of the toilet roll 1 per roll width W 114 mm. The roll volume is expressed by [{cross-sectional area of the outer diameter of the roll (winding diameter DR) portion) − (cross-sectional area of the core outer diameter portion)] × roll width (converted per 114 mm). For example, when the roll mass per roll width 114 mm is 270 g, the winding diameter is 117 mm, and the outer diameter of the core is 39 mm, the roll density = 270 g ÷ [{3.14 × (117 mm ÷ 2 ÷ 10) ² −3.14 × ( 39 mm ÷ 2 ÷ 10) ² } × (114 mm ÷ 10)] = 0.25 g / cm ³ . In addition, when the toilet roll 1 has no core, the diameter of the center hole is set as the core outer diameter.

The roll density of the toilet roll 1 is preferably 0.17 g / cm ³ or more and 0.32 g / cm ³ or less, more preferably 0.20 g / cm ³ or more and 0.29 g / cm ³ or less. most preferably .22g / cm ³ or more 0.27 g / cm ³ or less. By making the roll density of the toilet roll 1 within the above range, the emboss pattern of the inner roll toilet paper 1x is not crushed, and the ratio {(D2 / D1) × 100} is suitably maintained. And the cosmetics at the time of use of the toilet paper 1x are maintained favorable. In addition, the softness of the roll is maintained well, the winding diameter DR is maintained in an appropriate range, and the roll is easily stored in the toilet paper holder, and a defective product in which the inner winding side of the roll jumps out in the axial direction does not occur.

Here, the softness of the roll is the tactile sensation when the toilet roll 1 is held in the store, and does not directly reflect the softness of the sheet. However, since the roll cannot be unwound at the store and the softness of the sheet cannot be confirmed, even if the sheet itself is soft, if the roll is hard, the sheet seems to be hard, and purchase cannot be promoted. For this reason, the sales promotion effect can be heightened by improving the softness of the roll.

For the toilet roll 1 of the present invention, the roll mass per roll width of 114 mm is preferably 200 g or more and 400 g or less, more preferably 230 g or more and 350 g or less, more preferably 250 g or more, excluding the mass of the core. More preferably, it is 330 g or less. When the roll mass is within the above range, the roll softness and roll density of the toilet roll 1 are maintained within a suitable range, the softness of the toilet paper 1x is good, and the embossed pattern is The cosmetics of the toilet paper 1x are maintained well without being crushed.

[Core outer diameter]
The core outer diameter, which is the outer diameter of the core of the toilet roll 1 of the present invention, is preferably 25 mm or more and 48 mm or less, more preferably 35 mm or more and 46 mm or less, and 37 mm or more and 43 mm or less. Further preferred. When the core outer diameter is within the above range, the toilet roll 1 can be easily stored in the toilet paper holder while suitably maintaining the winding density of the toilet roll 1. The handleability of the toilet roll 1 is also improved. Further, the weight of the core of the toilet roll 1 is preferably 3.0 g or more and 5.7 g or less, more preferably 3.7 g or more and 5.2 g or less, and 4.2 g or more and 4.8 g or less. Is more preferable. By setting the core mass within the above numerical range, it is possible to realize good core strength and core cost suitable for the long toilet paper 1x as in the present application. The mass of the core is a mass having a roll width of 114 mm, like the roll mass.

[Specific volume]
The specific volume of the toilet paper 1x is preferably 3.0 cm ³ / g or more and 7.5 cm ³ / g or less. When the specific volume of the toilet paper 1x is within the above range, the softness of the sheet becomes good, the bulk (bulk height) is suitably maintained, and the moisture absorption is well maintained, The winding diameter DR does not become too large. The specific volume is more preferably 3.3 cm ³ / g or more 6.7cm is ³ / g or less, and further preferably 3.6 cm ³ / g or more 6.4 cm ³ / g or less.

[DMDT, DCDT]
DMDT (Dry Machine Direction Tensile Strength) is the tensile strength in the vertical direction when drying toilet paper 1x (sheet laminated on 2 plies) according to JIS P 8113, and DCDT (Dry Cross) is the tensile strength in the horizontal direction when drying. DMDT is preferably 2.5 N / 25 mm or more and 7.0 N / 25 mm or less, more preferably 3.0 N / 25 mm or more and 5.8 N / 25 mm or less, and (Direction Tensile Strength). / 25 mm or more and 4.5 N / 25 mm or less is more preferable. The DCDT is preferably 0.70 N / 25 mm or more and 2.2 N / 25 mm or less, more preferably 0.80 N / 25 mm or more and 1.8 N / 25 mm or less, and 1.0 N / 25 mm or more and 1. More preferably, it is 5 N / 25 mm or less. When DMDT and DCDT are within the above range, the sheet is hardly broken and the softness of the sheet is also suitably maintained. In addition, the measurement of tensile strength is performed on conditions with a tensile speed of 300 mm / min. The tensile strength can be adjusted by a known method.

In the above description, the flow direction of the toilet paper 1x is referred to as “longitudinal direction”, and the direction perpendicular to the flow direction is referred to as “lateral direction”.

[Water absorption]
The water absorption based on the old JIS S 3104 of the toilet paper 1x (sheet laminated on 2 plies) is preferably 7.0 seconds or less, more preferably 5.0 seconds or less, and 3.0 seconds. More preferably, it is as follows. The water absorption is preferably a short time, and the water absorption is favorably maintained by being within the above time range. In addition, when dripping water, it is dripped at the surface side of toilet paper.

[Ease of loosening]
The ease of loosening based on JIS P 4501 when the toilet paper 1x is peeled into one sheet is preferably 8 seconds to 60 seconds, more preferably 15 seconds to 50 seconds, and more preferably 20 seconds to 40 seconds. More preferably, it is less than a second. The ease of unraveling is preferably a short time. By being within the above-mentioned time range, water disintegration in the toilet is maintained well, and the water resistance when the toilet paper in a warm-washed toilet seat gets wet with water Will also be good.

<Toilet paper>
Toilet paper 1x may be made of 100% by weight of wood pulp, and may include waste paper pulp, non-wood pulp, and deinked pulp. In order to obtain the target quality, the content of NBKP (coniferous bleached kraft pulp) is preferably 0% by mass or more and 30% by mass or less, more preferably 0% by mass or more and 20% by mass or less, More preferably, it is 5 mass% or more and 15 mass% or less. The content of LBKP (hardwood bleached kraft pulp) is preferably 30% by mass or more and 90% by mass or less, more preferably 40% by mass or more and 80% by mass or less, and 50% by mass or more and 70% by mass or less. More preferably.

The content of waste paper pulp derived from a milk carton (milk pack) is preferably more than 0% by mass and 60% by mass or less, more preferably from 10% by mass to 50% by mass, and more preferably from 20% by mass to 40% by mass. More preferably, the content of kraft pulp is preferably 40% by mass or more and less than 100% by mass, more preferably 50% by mass or more and 90% by mass or less, and more preferably 60% by mass or more. More preferably, it is 80 mass% or less.

Waste paper pulp derived from milk cartons (milk cartons) is mainly softwood pulp and has the merit that it can easily improve the strength of toilet paper 1x. May be affected. By setting the content of the waste paper pulp derived from the milk carton to be within the above range, the strength of the toilet paper 1x can be effectively improved while suppressing variations in quality.

In addition, as said LBKP, the pulp formed from the genus Eucalyptus genus grade represented by Eucalyptus genus Grandis and Eucalyptus globulus is preferable.

In the present invention, deinked pulp derived from newspaper or magazine waste paper can be blended within a range of 25 parts by weight or less with respect to 100 parts by weight of waste paper pulp derived from NBKP, LBKP, or milk carton. In addition, when 25 mass parts of deinked pulp is blended, the content of deinked pulp in the toilet paper 1x (sheet) is 25 mass parts / (100 mass parts + 25 mass parts) × 100 = 20 mass%. . The content of the deinked pulp is preferably 0% by mass or more and 20% by mass or less, more preferably 0% by mass or more and 10% by mass or less, and further preferably 0% by mass or more and 5% by mass or less. The most preferable is 0% by mass. Since the deinked pulp is also waste paper, blending it into the pulp raw material increases the quality variation of the toilet paper 1x. Moreover, deinked pulp usually contains a fluorescent dye, and if the content exceeds 20% by mass, the toilet paper 1x may contain a large amount of fluorescent dye. For this reason, the content of deinked pulp is preferably 20% by mass or less.

If the deinked pulp contains a fluorescent dye, the difference Δ between the whiteness value of the toilet paper 1x (sheet) under the UV-in condition and the whiteness value under the UV-cut condition becomes large. Here, UV-in is a whiteness degree based on ISO 2470 when a C light source (including ultraviolet light) defined by CIE (International Commission on Illumination) is irradiated on the surface side of toilet paper 1x. UV-cut is a whiteness degree according to ISO 2470 when a C light source is irradiated on the surface side of the toilet paper 1x through a filter that cuts out ultraviolet light having a wavelength of 420 nm or less. Difference Δ = (whiteness UV-in) − (whiteness UV-cut).

The difference Δ is preferably 0.0 points or more and 2.5 points or less, more preferably 0.0 points or more and 1.5 points or less, and 0.0 points or more and 1.0 points or less. Is more preferably 0.0 point or more and 0.5 point or less. The whiteness can be measured using a high-speed spectrophotometer CMS-35SPX manufactured by Murakami Color Research Laboratory Co., Ltd. according to ISO 2470.

In addition, in order to ensure an appropriate strength for the toilet paper 1x, the strength can be adjusted by blending raw materials by a normal means and performing a pulp fiber beating process. The beating to obtain the target quality is a Canadian standard freeness measured according to JIS P 8121 with respect to commercially available virgin pulp, and the difference in freeness before and after beating is preferably 0 to 150 ml, more preferably An example of the beating treatment is 10 to 100 ml, more preferably 20 to 70 ml.

Toilet paper 1x, when virgin raw materials are used for the stock, soft paper kraft pulp and hardwood kraft pulp having a certain range of fiber length and fiber roughness can be blended in a specific range to make paper. Additives to paper stocks include softeners including debonder softeners, bulking agents, dyes, dispersants, dry paper strength enhancers, drainage improvers, pitch control agents, absorbency, depending on the required quality of the final product. An improver or the like can be used. It is preferred not to use a wet paper strength enhancer. Even when the waste paper raw material is used for the stock of the toilet paper 1x, the same process as in the case of the virgin system is performed.

[Toilet paper manufacturing method]
Toilet paper 1x can be manufactured, for example, in the following order: (1) papermaking and creping, (2) ply-up and calendaring with a machine winder, and (3) embossing and roll winding. Of these, (3) has already been described and will be omitted.

(Paper making and creping)
First, a web is made from the above-mentioned stock on a wire part of a known paper machine, and moved to the felt of the press part. Examples of the wire part system include a round net type, a long net type (Ford Linear) type, a suction breast type, a short net type, a twin wire type, and a crescent former type.

Then, the web is mechanically compressed with a suction pressure roll or a non-suction pressure roll or a press roll, or a dehydration method such as aeration drying with hot air is used to continue dewatering. The suction pressure roll or the pressure roll without suction is also used as a means for moving the web from the press part to the Yankee dryer.

The web moved to the Yankee dryer is dried with a Yankee dryer and a Yankee dryer hood, then creped by a creping doctor, and wound on a reel part.

Creping (applying a wavy wrinkle called crepe) is to mechanically compress paper in the longitudinal direction (the sheet running direction on the paper machine). When the toilet paper 1x web is manufactured, the web on the Yankee dryer is peeled off by the creping doctor and wound on the reel part. The speed difference between the Yankee dryer and the reel part (reel part speed ≤ Yankee dryer speed) The crepe is formed by the creping doctor depending on the speed.

The quality required for the toilet paper 1x, that is, bulk (bulk feeling), softness, water absorption, surface smoothness, aesthetics (crepe shape), and the like depend on the speed difference. Although it depends on conditions such as the speed difference, the basis weight of the web on the reel after creping is approximately 14 g / m ^{2 to} 21 g / m ^2, which is heavier than the basis weight of the web on the Yankee dryer before creping. The basis weight is preferably 14 g / m ² or more and 19 g / m ² or less, more preferably 15 g / m ² or more and 18 g / m ² or less. If the above range is exceeded, the strength may be high and the paper may become stiff or the roll density may be too high. If it is less than the above range, the strength may be weak and easy to tear, and the feeling of use and bulkiness may be poor. Sometimes.

Here, the crepe rate based on the speed difference between the Yankee dryer and the reel is defined by the following equation.
Crepe rate (%) = 100 × (Yankee dryer speed (m / min) −reel speed (m / min)) ÷ reel speed (m / min)

Quality and operability are largely determined by the creping conditions, and the operating conditions that optimize the creping conditions are important for those skilled in the art. In the present invention, the crepe rate when producing the toilet paper 1x is preferably 10% or more and 50% or less, more preferably 15% or more and 40% or less, and most preferably 20% or more and 35% or less. preferable.

(Ply-up and calendar processing by machine winder)
FIG. 8 shows an example of the machine winder 100. As described above, two reels 11 taken up by the reel part after creping are set on the machine winder 100, and the two reels 11 are overlapped with each other so that the Yankee surface is on the outer side. At this time, the calendar processing is performed in two stages in order of the calendar machine 101 of the first stack and the calendar machine 102 of the second stack after the ply-up. Of course, only one stage of calendar processing may be performed on either the first stack calendar machine 101 or the second stack calendar machine 102. It is also possible to perform calendar processing before ply-up or with an on-machine calendar.

The thickness of the toilet paper 1x before embossing (after calendaring) is preferably 0.50 mm / 10 or more and 1.40 mm / 10 or less, more preferably 0.60 mm / 10 or more and 1.20 mm / 10 or less. More preferably, the thickness is 0.60 mm / 10 or more and 0.90 mm / 10 or less. Also, preferably the specific volume of the toilet paper 1x in bulk roll 12 of embossed before (after calendering) is 3.4cm ³ / g or more 6.5cm ³ / g or less, more preferably 3.7 cm ³ / g or more 6.0 cm ³ / g or less, more preferably to 4.0 cm ³ / g or more 5.5cm ³ / g or less.

In addition, the paper thickness of the toilet paper 1x before the embossing processing is the paper thickness of the original fabric roll 12 after the calendar processing in FIG. 8, and corresponds to the paper thickness t1 in FIG. However, as will be described later, since the paper thickness is a value measured at a measurement load of 3.7 kPa, it does not accurately reflect the paper thickness t1 in FIG.

Moreover, although the paper thickness of the toilet paper 1x after the embossing process shown in Table 1 and Table 2 corresponds to the paper thickness t2 of FIG. 3, it is a value measured at a measurement load of 3.7 kPa, so the paper thickness t2 is accurately It is not reflected in.

On the other hand, the depths D1 and D2 of the emboss pattern are measured in a state where the emboss is not compressed. Accordingly, the depths D1 and D2 of the emboss pattern are significantly larger than values calculated from the paper thicknesses t1 and t2 (this value is a value obtained by compressing the emboss with a measured load of 3.7 kPa).

Each of the

calendar machines

101 and 102 is preferably composed of two metal rolls, but one of the two rolls may be an elastic roll so that the soft calendar process can be performed.

The linear pressure of the calendar is preferably from 3.0 kgf / cm to 8.0 kgf / cm, more preferably from 4.0 kgf / cm to 7.0 kgf / cm. When the linear pressure is within the above range, the bulk of the toilet paper 1x is maintained well, the softness of the toilet paper 1x is good, and the roll diameter DR of the roll is also within an appropriate range. Maintained. The linear pressure is preferably higher than the first stack.

* Draw can be adjusted as appropriate during calendar processing. The draw between the reel 11 before the ply-up and the raw roll 12 after the calendar process is preferably 100% or more and 110% or less, and more preferably 102% or more and 108% or less.

¡Weighing and paper thickness can be managed by calendar processing and draw adjustment.

It is preferable that the basis weight of the web of embossed before original fabric roll 12 and one per 13.5 g / ^{m 2} or more 20.5 g / ^{m 2} or less after calendering. Because web basis weight becomes lower stretch slightly in the roll winding process to be described later, to be slightly higher 14.0 g / m ² or more 18.5 g / m ² or less than the target basis weight of toilet rolls 1 final form It is preferably 14.5 g / m ² or more and 17.5 g / m ² or less. In addition, since the web is slightly stretched in the roll winding process, the paper thickness is reduced similarly to the basis weight before and after winding, but the embossing can be adjusted to the target paper thickness of the toilet roll 1 in the final form.

The raw roll 12 after the calendar process is embossed by, for example, the roll winding machine 110 in FIG. 9 to obtain the toilet roll 1. Note that the winding density and the roll softness are obtained by pressing the base paper roll 13 from the outer peripheral side and winding the sheets sequentially when the roll winding machine 110 in FIG. 9 winds the wide base paper roll 13 by the winding mechanism 113. Therefore, the pressing force of the rider roll 114 can be adjusted by setting it within a predetermined range.

The present invention is not limited to the above-described embodiment, and it goes without saying that the present invention covers various modifications and equivalents included in the concept and scope of the present invention.

The content of the pulp composition is (mass%) NBKP 10%, LBKP 60%, and used paper pulp derived from milk carton 30%, without containing deinked pulp, by the apparatus shown in FIGS. Toilet paper and toilet roll shown in Table 2 were produced.

The following evaluation was performed.

Longitudinal tensile strength DMDT during drying and transverse tensile strength DCDT during drying: Based on JIS P 8113, the maximum load up to breakage was measured in units of N / 25 mm for toilet paper laminated to 2 plies. . The tensile strength was measured under the condition of a tensile speed of 300 mm / min.

Basis weight: Measured based on JIS P8124 and converted per sheet.

Paper thickness: measured using a thickness gauge (a dial thickness gauge “PEACOCK” manufactured by Ozaki Seisakusho). The measurement conditions were a measurement load of 3.7 kPa and a probe diameter of 30 mm. A sample was placed between the probe and the measurement table, and the gauge was read when the probe was lowered at a speed of 1 mm or less per second. In addition, about the web before a calendar process, it measures by stacking 10 sheets, and after a calendar process (after ply-up) and a roll, 10 sheets are laminated | stacked 5 sets of toilet paper which laminated | stacked the sheet | seat on 2 plies. Measurements were taken as minutes. The measurement was repeated 10 times and the measurement results were averaged.

Specific volume: The paper thickness per sheet was divided by the basis weight per sheet, and expressed as a volume cm ³ per unit g.

Roll roll diameter DR, core outer diameter DI: Measured using a Diameter Rule manufactured by Muratec KDS Corporation. The measurement measured 10 rolls and averaged the measurement results.

Roll winding density, embossed pattern depths D1 and D2, roll density, and roll softness were measured by the methods described above. In addition, the winding density of the roll measured 10 rolls used for the measurement of the roll diameter DR of the roll, and averaged the measurement results. In the table, when the depth of the emboss pattern is less than 0.01 mm, it is indicated by a hyphen.

Winding length: About the sheet between the perforations of the toilet roll, the length of 10 sheets was measured. Thereafter, the number of sheets of the roll was measured, and the winding length was obtained by proportional calculation from the length of 10 sheets and the number of sheets. For example, when the length of 10 sheets is 2.275 m and the number of sheets is 330 sheets, 2.275 m × (330/10) = 75 m. When there was no perforation, the winding length was obtained by actual measurement.

Roll mass: The roll mass was measured using an electronic balance. First, the roll mass including the core was measured, and then the mass of the core was measured. The mass of the core was subtracted from the mass of the roll including the core to obtain the roll mass. The roll mass was obtained by measuring 10 rolls and averaging the measurement results. In addition, when roll width W was different from 114 mm, W was converted into 114 mm and roll mass was calculated | required. For example, when the roll width W is 105 mm, the mass obtained by multiplying the roll mass by a coefficient (114/105) is defined as the roll mass per W of 114 mm.

Sensory evaluation was performed by 20 monitors. The evaluation standard was a perfect score. If the evaluation criteria is 3 points or more, it is good.
Note that the basis weight, tensile strength, paper thickness, specific volume, winding diameter DR, core outer diameter DI, roll density, roll mass, winding length, roll softness, winding density, and embossed pattern depth can be measured according to JIS. It was carried out after maintaining the equilibrium state under the temperature and humidity conditions specified in P8111 (23 ± 1 ° C., 50 ± 2% RH).

The results obtained are shown in Tables 1 and 2.

As is clear from Tables 1 and 2, in each example in which the roll length, roll diameter, roll softness, and ratio (D2 / D1) of the toilet roll are in a predetermined range, the sheet is not reduced in weight. While improving the softness of the film, it was possible to maintain the cosmetic properties by embossing and to increase the winding length per roll.

On the other hand, in the case of Comparative Example 1 in which the winding length was less than 63 m, an emboss pattern with an appropriate depth was given and the sheet had excellent softness, but the winding diameter was less than 105 mm, and the roll replacement frequency was low. Increased.

Further, in the case of Comparative Example 2 in which the winding length exceeded 105 m, the embossing pattern with an appropriate depth was given and the softness of the sheet was excellent, but the winding diameter exceeded 140 mm, the roll diameter increased, and the toilet It became hard to fit in the paper holder.

In Comparative Example 3 in which the depth of the embossed pattern was less than 0.01 mm and the roll softness was less than 0.4 mm, the toilet paper was low in volume and the softness of the sheet and roll was reduced.

In the case of Comparative Example 4 in which the depth D1 of the emboss pattern exceeds 0.40 mm and the roll softness exceeds 1.9 mm, the unevenness of the emboss pattern becomes too remarkable and the bulk becomes too high (the density becomes too low). ), The roll diameter of the toilet roll exceeded 140 mm, and the roll diameter was increased, making it difficult to fit in the toilet paper holder.

In the case of Comparative Example 5 in which the toilet paper is strongly (hardly) wound by a roll winder and the roll softness is less than 0.4 mm, the roll softness decreases and the ratio [(D2 / D1) × 100] Was 45% or less, the balance of the cosmetics of the embossing roll was lowered, the winding diameter was less than 105 mm, and the softness of the roll was inferior.

In the case of Comparative Examples 6 and 7 in which the toilet paper was wound too weakly (loosely) with a roll winder, the roll softness exceeded the predetermined range of the present application, and the winding diameter exceeded 140 mm, which was attached to the toilet paper holder. In Comparative Example 7 in which the lower winding was wound too loosely, the ratio [(D2 / D1) × 100] exceeded 100%, and the roll shape retention was inferior.

The winding diameter and roll softness within the predetermined numerical range in the present invention are that the comparative example 8 corresponding to the comparative example 6 has a good fit in the toilet paper holder, but the winding length Became less than 63 mm, and the replacement frequency of the roll increased.

The point that the roll softness was set within the predetermined numerical range in the present invention is that, in Comparative Example 9 corresponding to Comparative Example 3, the softness of the roll was improved, but the depth D of the embossed pattern was Since it was less than 0.01 mm, the softness of the sheet was inferior.

In addition, when the

commercial products

1 and 2 were evaluated in the same manner, the roll length was less than 63 m, and the roll replacement frequency increased.

DESCRIPTION OF SYMBOLS 1 Toilet roll 1a Roll surface 1b Roll back surface 1e Edge of outermost roll of toilet paper 1x Toilet paper 11 Reel 12 Original fabric roll 13 Base paper roll 100 Machine winder 101 First stack calendar machine 102 Second stack calendar machine 110 Roll Winding machine 111 Embossing roll 112 Rubber roll 113 Winding mechanism 114 Rider roll 2 Embossed pattern 2R Concave part 2P Convex part D1, D2 Depth of embossed pattern

Claims

A toilet roll that is laminated on two plies and wound with a roll of toilet paper with an embossed pattern,
The winding length is 63 m or more and 105 m or less, the winding diameter is 105 mm or more and 140 mm or less, and the roll softness is 0.4 mm or more and 1.9 mm or less,
A toilet roll in which a ratio {(D2 / D1) × 100} of an emboss pattern depth D1 (mm) to an emboss pattern depth D2 (mm) is 45% or more and 100% or less.
[here,
The emboss pattern depth D1 is the depth of the emboss pattern at a position corresponding to 10% of the roll length of the toilet roll from the edge of the outermost roll of toilet paper when the toilet roll is unwound.
The emboss pattern depth D2 is the depth of the emboss pattern at a position corresponding to 90% of the roll length of the toilet roll from the edge of the outermost roll of toilet paper when the toilet roll is unwound. ]
The toilet roll according to claim 1, wherein a depth D1 of the emboss pattern is 0.01 mm or more and 0.40 mm or less, and a depth D2 of the emboss pattern is 0.01 mm or more and 0.35 mm or less.
The toilet roll according to claim 1 or 2, wherein the embossed pattern is a single embossed pattern.
Toilet paper according to any one of claims 1 to 3, wherein the toilet paper contains kraft pulp in an amount of 40% by mass to less than 100% by mass.
The toilet roll according to any one of claims 1 to 4, comprising more than 0 mass% and 60 mass% or less of waste paper pulp derived from milk carton.
Through a filter that cuts off UV light with a wavelength of 420 nm or less and whiteness UV-in conforming to ISO 2470 when the surface of toilet paper is irradiated with a C light source specified by the CIE (International Commission on Illumination) The difference Δ with whiteness UV-cut based on ISO 2470 when a light source is irradiated on the surface side of toilet paper is 0.0 point or more and 2.5 point or less, according to any one of claims 1 to 5. Toilet roll.