JP6859578B2 - Toilet roll - Google Patents

Description

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 packaged as a set of 4 rolls or 12 rolls and are commercially available. Since the packaged toilet rolls are bulky, the number of toilet rolls that can be carried at the time of purchase is limited, and due to such restrictions, the amount that can be purchased at one time is also limited. In addition, toilet rolls may be stored in homes, workplaces, public facilities, etc., but it is not always possible to secure a large storage space.

Under these circumstances, a toilet roll 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 lengthened has been proposed (for example, Patent Document 1 and 2), a toilet roll with a longer winding length has been developed while increasing the basis weight per sheet of toilet paper to ^{more than 13 g / m 2} to improve the texture and usability (see, for example, Patent Document 3). ..

Japanese Unexamined Patent Publication No. 2006-087703 Japanese Unexamined Patent Publication No. 2013-208297 Japanese Unexamined Patent Publication No. 2014-188342

However, in general, when the basis weight of the toilet paper is lowered, the strength is lowered, and the usability and bulkiness are also lowered. On the other hand, if the calendar processing is weakened for the purpose of making the toilet paper bulky in order to compensate 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 deteriorated.

Further, it is necessary to increase the roll density in order to prevent the winding diameter from becoming large and not to hinder the attachment to the toilet paper holder while increasing the winding length of the toilet roll. However, in this case, there is a problem that excessive pressure is particularly applied to the inner-wound toilet paper, the embossing provided on the inner-wound toilet paper is crushed, and the cosmeticity is deteriorated at the time of use.

Therefore, in 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 embossing is excellent in cosmetics, and the portability and storage time are saved. The purpose is to provide a toilet roll with excellent space.

The inventors of the present invention have conducted diligent research in order to solve the above problems. As a result, in order to improve the softness and cosmeticity of the sheet, in the toilet roll in which the embossed pattern is applied to the toilet paper, the ratio of the depth of the embossed pattern of the outer winding and the inner winding of the toilet roll is within a predetermined range. By adjusting various conditions, it was found that the beauty of the toilet paper can be maintained, the length of the toilet roll can be increased, and the diameter of the toilet roll can be prevented from becoming large, and the present invention has been completed. Specifically, the present invention provides the following.

(1) The first aspect of the present invention is a toilet roll in which toilet paper laminated in two plies and having an embossed pattern is wound into a roll, having a winding length of 63 m or more and 105 m or less and a winding diameter. The winding density is 105 mm or more and 140 mm or less, the winding density is 1.1 m / cm ² or more and 2.0 m / cm ² or less, and the roll mass per roll width 114 mm (however, the mass of the core is not included) is 200 g or more and 400 g or less. This is a toilet roll in which the ratio {(D2 / D1) × 100} of the embossed pattern depth D1 (mm) to the embossed pattern depth D2 (mm) is 45% or more and 100% or less.

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

(2) The second aspect of the present invention is the toilet roll according to (1), in which the depth D1 of the embossed pattern is 0.01 mm or more and 0.40 mm or less, and the depth D2 of the embossed pattern is 0. It is characterized in that it is 0.01 mm or more and 0.35 mm or less.

(3) The third aspect of the present invention is the toilet roll according to (1) or (2), characterized in that the embossing pattern is a single embossing pattern.

(4) A fourth aspect of the present invention is the toilet roll according to any one of (1) to (3), wherein the roll density is 0.17 g / cm ³ or more and 0.32 g / cm ³ or less. It is characterized by that.

(5) A fifth aspect of the present invention is the toilet roll according to any one of (1) to (4), 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.

(6) A sixth aspect of the present invention is the toilet roll according to any one of (1) to (5), which contains more than 0% by mass of recycled paper pulp derived from a milk carton and 60% by mass or less. It is characterized by.

(7) A seventh aspect of the present invention is the toilet roll according to any one of (1) to (6), wherein a C light source specified by the CIE (International Commission on Illumination) is placed on the surface side of the toilet paper. ISO 2470-compliant whiteness when irradiated UV-in and ISO 2470-compliant whiteness when a C light source is irradiated to the surface side of toilet paper via a filter that cuts ultraviolet light with a wavelength of 420 nm or less. The difference Δ from UV-cut is 0.0 points or more and 2.5 points or less.

According to the present invention, the basis weight of the toilet paper is maintained at the same level as that of the conventional product, the sheet is excellent in softness, the winding length per roll is long, and the beauty of the embossed pattern is maintained, and the portability and storage are maintained. It is possible to provide a toilet roll that is excellent in space saving at the time.

It is a perspective view which shows the appearance of the toilet roll which concerns on 1st Embodiment of this invention. It is a figure which shows the photographed image of the embossing pattern on the roll surface side. It is sectional drawing which shows the embossing pattern provided on the front surface and the back surface of a roll. It is a figure which shows the measuring method of the depth of the embossing pattern. It is a figure which shows the measuring method of the depth of the embossing pattern. It is a figure which shows the measuring method of the depth of the embossing pattern. It is a figure which shows the measuring method of the depth of the embossing pattern. It is a figure which shows an example of a machine winder. It is a figure which shows an example of the roll winding processing machine. It is a drawing which shows the photographed image of the defective product which the inner winding side of a roll protruded in the axial direction. Schematic positions corresponding to 10% and 90% of the length of the toilet roll from the edge of the outermost roll of toilet paper when the toilet roll is unwound, which is specified when measuring the depth of the embossed pattern. It is a drawing shown in. It is a drawing which shows typically how to select 10 arbitrary embossing when measuring the depth of the embossing pattern.

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

<Toilet roll>
The toilet roll 1 of the present invention is a toilet roll 1 in which toilet paper 1x laminated in two plies and having an embossed pattern is wound into a roll shape, and has a winding length (winding length) of 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 winding density is 1.1 m / cm ² or more and 2.0 m / cm ² or less, and the roll mass per roll width 114 mm (however, the mass of the core) (Not included) is 200 g or more and 400 g or less, and the ratio {(D2 / D1) × 100} of the embossed pattern depth D1 (mm) and the embossed pattern depth D2 (mm) is 45% or more and 100% or less. ..

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

Of the surface of the toilet paper 1x, the surface facing the outside of the roll is referred to as the roll surface 1a (the surface of the toilet paper 1x), and the surface facing the center of the roll is referred to as the back surface of the roll 1b (or the back surface of the toilet paper 1x). Refer to.

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

[Volume length]
When the roll length of the toilet roll 1 is 63 m or more and 105 m or less, the space of the toilet roll 1 can be saved, the roll diameter DR is maintained in an appropriate range, and the toilet roll 1 is sufficient for the toilet paper holder. 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.

[Volume diameter]
When the winding 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.

[Volume density]
As described above, if the roll is wound too tightly, excessive pressure is applied to the inner-wound toilet paper 1x, the embossing provided on the inner-wound toilet paper 1x is crushed, and the cosmeticity is deteriorated at the time of use. On the other hand, if the roll is wound too weakly, the embossing will not be crushed, but the winding diameter will become large, making it difficult to attach the toilet roll 1 to the toilet paper holder, or the winding force of the inner winding will become too weak. As shown in the photograph of FIG. 10, the inner winding side of the roll protrudes in the axial direction, and a defective product may occur. Therefore, the winding density is defined as a factor for expressing the winding strength of the roll.

The winding density is expressed by (winding length x number of plies) ÷ (cross-sectional area of the roll). The cross-sectional area of the roll is represented by {cross-sectional area of the outer diameter (roll diameter DR) portion of the roll}-(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, the winding length 75 m, 2 ply, winding diameter 117 mm, if the outer diameter 39mm core, winding density = (75m × 2) ÷ { 3.14 × (117mm ÷ 2 ÷ 10) 2 -3.14 × (39mm ÷ 2 ÷ 10) ² } = 1.57 m / cm ² .

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 be easily fitted in the toilet paper holder or the like. The winding force of the roll becomes appropriate, the inner winding side of the roll protrudes in the axial direction (the shape retention of the roll is inferior), it does not become a defective product, and the softness of the sheet is maintained appropriately. The embossing provided on the toilet paper 1x is not crushed, and the beauty during use is maintained. The winding density is ^{preferably 1.2 m / cm 2} or more and 1.8 m / cm ² or less, and more preferably 1.4 m / cm ² or more and 1.7 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 sheets or more and 1.20 mm /. It is preferably 10 or less. When the basis weight and the paper thickness are within the above ranges, it becomes easy to adjust the winding hardness, the winding length, the winding diameter DR, and the winding density within the above ranges. As a method of adjusting the basis weight and paper thickness per 1 x 1 sheet of toilet paper within the above range, the calendar conditions (paper thickness and specific volume after calendar processing, paper thickness difference before and after calendar processing) and embossing conditions of the base paper web are used. The method to specify 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 usability (bulkness) of the toilet paper 1x are suitably maintained, and the toilet roll 1 is used. The winding diameter DR is also maintained within an appropriate range, making it easier 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 Is even more preferable. The thickness of the toilet paper 1x is more preferably 0.55 mm / 10 sheets or more and 1.05 mm / 10 sheets or less, and further preferably 0.65 mm / 10 sheets or more and 0.90 mm / 10 sheets or less.

[Embossed pattern]
The toilet roll 1 (toilet paper 1x) of the present invention is embossed and has an embossed pattern. As the embossing pattern of the toilet paper 1x of the present invention, a single embossing pattern is preferable. As shown in FIG. 3, the single embossing 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 the sheets are laminated in two plies.

FIG. 3 is a cross-sectional view showing a single embossed embossing 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 in 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 and the convex portion 2P appear on the back surface of the toilet paper 1x on which the embossing roll 111 is pressed (the front surface of FIG. 3). Note that FIG. 3A is a diagram when the depth of the embossing pattern is deep, and FIG. 3B is a diagram when the depth of the embossing pattern is shallow.

In this case, the paper thickness t2 of the toilet paper 1x after the embossing treatment (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 of the embossing on the back surface) is the same. However, in FIG. 3A, which is a sheet obtained by thinning the base paper to a paper thickness t1 by a calendar process and embossing the embossed patterns so that the depths D1 and D2 are deep, the sheet is softer and has a better texture. It is considered that this is because in FIG. 3A, in which the embossing unevenness is remarkable, the bulk of the base paper is higher (the density is lower), the deformation is more likely to occur, and the softness of the sheet is improved. ..

Further, in the case of FIG. 3A, in order to deepen the embossed pattern depths D1 and D2, it is necessary to reduce the paper thickness t1 per sheet by that amount to make the unevenness remarkable. The softness of the sheet is improved due to the strong calendar processing of the base paper. On the other hand, if the surface of the toilet paper 1x is smoothed without embossing, the surface is too smooth and the surface feels crisp, and the softness of the sheet is inferior. If the embossed recess 2R is provided on the outside of the roll (on the roll surface 1a side) where water tends to adhere when using the warm water washing toilet seat in the toilet paper 1x, the recess 2R has a better tactile sensation than the convex portion. The softness of the sheet is improved. FIG. 2 shows a photographed image of the embossed recess 2R on the roll surface 1a side.

When double embossing is applied instead of the single embossing shown in FIG. 3, the front and back sheets of the toilet paper 1x are each embossed, and then the embossed convex surfaces of the respective sheets are placed inside and plyed. Up to 2 plies. Therefore, the paper thickness t2 of the toilet paper 1x may become too high, the winding density may become low, and it may be difficult to secure the winding length. Even in the double embossed pattern, if the depths D1 and D2 of the embossed pattern are made shallow, the paper thickness t2 becomes low, but the softness of the sheet may be inferior. Therefore, a single embossed pattern is preferred. Further, when forming a double embossed pattern, ply bond glue (glue) or knurling (edge embossing) is used when laminating two plies. Therefore, the single embossed pattern 2 is preferable from the viewpoint that two plies can be laminated without using ply bond glue or knurling.

Further, the means for ensuring the softness of the toilet paper 1x (sheet) is not limited to embossing, and any method that imparts unevenness to the surface is used, for example, to make the web uneven at the time of papermaking using an uneven fabric. You may. In this case, the depth of the unevenness may be in a range corresponding to the depths D1 and D2 of the embossing pattern described later.

(Embossed pattern depth D1, D2)
In the present invention, by defining the difference in the depth of the embossing pattern between the outer winding and the inner winding of the roll as a factor for expressing the winding strength 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 embossed pattern depth D1 (mm) and the embossed pattern depth D2 (mm) is set to 45% or more and 100% or less. The above 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 embossing pattern corresponds to 10% of the winding length of the toilet roll 1 from the edge 1e of the outermost wound toilet paper when the toilet roll 1 is unwound. It is the depth of the recess 2R of the embossing pattern 2 at the position M1, and the depth D2 of the embossing pattern is 90 of the winding 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 M2 corresponding to%. For example, when the winding length is 75 m, the position M1 is a portion from the edge 1e to 7.5 m, and the position M2 is a portion from the edge 1e to 67.5 m.

When the above ratio is 45% or more and 100% or less, the embossed pattern 2 provided on the inner-wound toilet paper 1x is used without being crushed without applying excessive pressure to the inner-wound toilet paper 1x. The balance of beauty at the time is good, it is easy to attach it to the toilet paper holder, the shape retention of the roll is inferior, and there is no defective product in which the inner winding side protrudes in the axial direction.

The depths D1 and D2 of the embossed pattern are obtained by measuring the height difference of the embossed pattern using a microscope.

As the microscope, the product name "One-shot 3D measurement macroscope VR-3100" manufactured by KEYENCE can be used. The product name "VR-H1A" can be used as the image observation / measurement / image analysis software of the microscope. The measurement is performed under the conditions of a magnification of 12 times and a visual field area of 24 mm × 18 mm. The measurement magnification and the visual field area may be appropriately changed depending on the size of the desired embossed pattern.

First, as shown in FIG. 4, the longest portion a of the peripheral edge fr of the embossed pattern is obtained. FIG. 5A shows the height profile on the XY plane by the microscope, and it can be seen that the height of the toilet paper 1x surface is represented by shading. The dark-colored portion in FIG. 5 (a) shows an individual embossed pattern, and the longest portion a of one embossed pattern can be distinguished from FIG. 5 (a). By drawing the line segments AB that cross the longest portion a, the height (measurement cross-sectional curve) profile of the embossed pattern is obtained as shown in FIG. 5 (b). Here, since the convex portion (non-embossed portion) and the concave portion of the embossed pattern can be seen from the shade of color of the XY plane image, the line segments AB are drawn so as to cross the portion where the convex portion and the concave portion are adjacent to each other. You just have to decide.

Here, the height profile of FIG. 5B is a (measured) cross-sectional curve T representing the unevenness of the sample surface of the actual toilet paper 1x, but noise (fiber lumps are present on the surface of the toilet paper 1x, etc. The fibers are elongated in a beard shape or include steep peaks due to a portion without fibers), and it is necessary to remove such noise peaks when calculating the height difference of the unevenness. Therefore, as shown in FIG. 6, the "contour curve" U is calculated from the cross-sectional curve T of the height profile, and of the contour curve U, two inflection points P1 and P2 that are convex upward and inflection points. The minimum value sandwiched between points P1 and P2 is obtained, and the minimum depth is set to Min. Further, the average value of the depth values of the inflection points P1 and P2 is defined as the maximum depth value Max.

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

Similarly, in FIG. 5A, the embossed pattern depths D1 and D2 are measured for the longest portion b in the direction perpendicular to the longest portion a, and the embossed pattern depths D1 and D1 of the longest portions a and b are measured. The larger value of D2 is adopted as the depths D1 and D2 of the embossing pattern. The above measurement is performed for any 10 embossed patterns 2 on the roll surface 1a of the toilet paper 1x, and the average value thereof is adopted as the final embossed pattern depths D1 and D2. Further, the product (a × b) of the longest portion a and the longest portion b is obtained as the area S of the embossed pattern 2. For the longest portion a and the longest portion b, the 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 are used. However, as shown in FIG. 7, when the embossed pattern is connected in the flow direction (MD direction), the longest portion a becomes the same as the winding length, the height difference cannot be obtained, and the depth D of the recess is increased. Cannot measure. Therefore, the line segments AB can be drawn so as to straddle the embossed pattern in the width W direction orthogonal to the direction in which the embossed patterns are connected (MD direction), and the depth D of the recess can be measured. Similarly, when the embossed pattern is connected in the width W direction (CD direction), a line segment AB is drawn so as to straddle the embossed 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. Is even more preferable. The area ratio of the embossed pattern (the ratio of the portion of the toilet paper having the embossed pattern) is preferably 3% or more and 60% or less, more preferably 7% or more and 45% or less, and 10%. It is more preferably 30% or more. When it is difficult to obtain the area ratio of the embossed pattern of the toilet paper, the area ratio of the convex portion of the embossed roll 111 can be used as the area ratio of the embossed pattern. When the embossed area S and the area ratio are within the above ranges, the size of the embossed pattern is appropriately maintained, and the embossed pattern is excellent in cosmeticity and winding density.

The shape of the embossed pattern is not particularly limited, such as a rectangle, a square, a round shape, an oval shape, or the like. Further, the winding diameter and the winding density can be adjusted by appropriately adjusting the size of the embossed pattern and the area ratio (number) of the embossed patterns shown above.

When measuring the depths D1 and D2 of the embossing pattern, the measurement surface is on the roll surface 1a side regardless of whether the embossing is single embossing or double embossing. Further, when determining the embossing pattern depths D1 and D2 and the embossing area S, when selecting any 10 embossing patterns 2, the following is performed. As shown in FIG. 12, for example, when the depth D1 of the embossing pattern and the embossing area S are obtained, the winding length of the toilet roll 1 corresponds to 10% from the edge 1e of the outermost winding toilet paper 1x of the toilet roll 1. Arbitrary 10 are selected from the embossing patterns 2 at the predetermined positions M1. At this time, it is not necessary for the center of the embossed pattern 2 to pass through the position M1, and the embossed pattern 2 on the position M1 may be placed in the field of view of the shape measuring laser microscope described above to identify the longest portions a and b. ..

When there are less than 10 embossed patterns 2 on the position M1, the group 2F of the embossed pattern 2 on the outer winding side adjacent to the embossed pattern 2 on the position M1 or the one adjacent to the embossed pattern 2 on the position M1. The insufficient number of embosses may be selected from the group 2E of the embossing 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 embossed 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 embossed 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 depths D1 and D2 of the embossed pattern are within the above ranges, the degree of unevenness of the embossed pattern is suitably maintained, the volume of the toilet paper 1x becomes appropriate, and the softness of the sheet is preferably made. In addition to being able to maintain it, it is also possible to maintain a state in which the toilet roll 1 can be easily attached to the toilet paper holder.

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

The roll take-up processing machine 110 is roughly classified into two types, a surface type and a center type. The surface method is a method in which a roll to be wound is supported from the outside by another plurality of drive rolls, and the wound toilet roll 1 is easy to control the winding diameter and has a higher production speed. The center method is a method of winding by driving a shaft passed through the center of the winding roll, and the wound toilet roll 1 becomes a relatively soft product and is suitable for a delicately embossed product. In the present invention, any method can be used for winding, but the surface method is preferable.

The machine winder 100 may be incorporated into the roll winding processing machine 110, and the roll winding processing machine 110 may perform ply-up, calendar processing, and embossing processing in this order. In addition, each piece of sanitary tissue paper may be plyed up after calendering and embossed.

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

The depths D1 and D2 of the embossing pattern can be adjusted by narrowing the nip width when the embossing roll is deep and widening the nip width when the embossing roll is shallow. Further, the strength of winding the roll can be adjusted so as to secure the depth D of the embossing pattern. For example, if the depth of the embossed pattern is increased, the embossed pattern is likely to be crushed when the roll is wound. Therefore, the depth D of the embossed pattern can be adjusted by lowering the winding strength of the roll.

The roll winding processing machine 110 can simultaneously perform printing, embossing, perforation processing, tail sealing, and cutting of a predetermined width (114 mm, etc.), and can manufacture the toilet roll 1. Further, after that, the film packaging process can be performed to produce a package of the toilet roll 1.

[Roll density, roll mass]
The roll mass is the mass of the toilet roll 1 per roll width W114 mm. The roll volume is represented by [{cross-sectional area of roll outer diameter (roll diameter) portion}-(cross-sectional area of core outer diameter portion)] x roll width (converted to around 114 mm). For example, a roll mass 270g per roll width 114 mm, if the winding diameter 117 mm, an outer diameter of the core is 39 mm, the roll density = 270g ÷ [{3.14 × ( 117mm ÷ 2 ÷ 10) 2 -3.14 × ( 39 mm ÷ 2 ÷ 10) ² } × (114 mm ÷ 10)] = 0.25 g / cm ³ . If the toilet roll 1 does not have a core, the diameter of the central hole is defined 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, and 0. most preferably .22g / cm ³ or more 0.27 g / cm ³ or less. By setting the roll density of the toilet roll 1 within the above range, the embossed pattern of the inner-wound toilet paper 1x is not crushed, and the ratio {(D2 / D1) × 100} is suitably maintained. Therefore, the beauty of the toilet paper 1x when used is maintained well. Further, the softness of the roll is maintained well, the winding diameter DR is maintained in an appropriate range, and it becomes easy to fit in the toilet paper holder, and a defective product in which the inner winding side of the roll protrudes 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 hand at the store, and does not directly reflect the softness of the sheet. However, since it is not possible to unwind the roll and check the softness of the sheet at the store, even if the sheet itself is soft, if the roll is hard, the sheet will be considered to be hard, and it will not be possible to encourage the purchase. Therefore, by improving the softness of the roll, the sales promotion effect can be enhanced.

Regarding the toilet roll 1 of the present invention, the roll mass per roll width 114 mm, excluding the core mass, is preferably 200 g or more and 400 g or less, preferably 230 g or more and 350 g or less, and 250 g or more and 330 g or less. Is more preferable. When the roll mass is within the above range, the winding density of the toilet roll 1 is maintained within a suitable range, the softness of the toilet paper 1x is improved, and the embossed pattern is crushed. The beauty of the toilet paper 1x is well maintained.

[Core outer diameter]
Further, 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. More preferred. When the core outer diameter is within the above range, the toilet roll 1 can be easily fitted in the toilet paper holder while the winding density of the toilet roll 1 is suitably maintained.

[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 (bulkness) is preferably maintained, the moisture absorption is well maintained, and the moisture absorption is 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 longitudinal tensile strength of toilet paper 1x (sheets laminated in 2 plies) based on JIS P 8113, and DCDT (Dry Cross) is the lateral tensile strength of toilet paper 1x (2-ply laminated sheet). Direction Tensile strength), the DMDT is preferably 2.5N / 25mm or more and 7.0N / 25mm or less, more preferably 3.0N / 25mm or more and 5.8N / 25mm or less, and 3.5N. It is more preferably / 25 mm or more and 4.5 N / 25 mm or less. The DCDT is preferably 0.70 N / 25 mm or more and 2.2 N / 25 mm or less, more preferably 0.8 N / 25 mm or more and 1.8 N / 25 mm or less, and 1.0 N / 25 mm or more. It is more preferably 5 N / 25 mm or less. When the DMDT and DCDT are within the above values, the sheet is less likely to be torn and the softness of the sheet is suitably maintained. The tensile strength is measured under the condition of a tensile speed of 300 mm / min. Further, the tensile strength can be adjusted by a known method.

In the above, the flow direction of the papermaking of the toilet paper 1x is defined as the “vertical direction”, and the direction perpendicular to the flow direction is defined as the “horizontal direction”.

[Water absorption]
The water absorption of toilet paper 1x (sheet laminated in 2 plies) based on the old JIS S 3104 is preferably 7.0 seconds or less, more preferably 5.0 seconds or less, and 3.0 seconds. The following is more preferable. The degree of water absorption is preferably short, and when it is within the above time range, good water absorption is maintained. When dropping water, drop it on the surface side of the toilet paper.

[Easy to unravel]
The ease of unraveling based on JIS P 4501 when the toilet paper 1x is peeled off is preferably 8 seconds or more and 60 seconds or less, more preferably 15 seconds or more and 50 seconds or less, and 20 seconds or more and 40 seconds. More preferably, it is less than or equal to seconds. The ease of unraveling is preferably short, and within the above time range, good water solubility in the toilet is maintained, and water resistance when the toilet paper is wet with water when using a warm water washing toilet seat is maintained. Will also be good.

<Toilet paper>
The toilet paper 1x may be made of 100% by mass of wood pulp, and may contain used 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, and more preferably 0% by mass or more and 20% by mass or less. It is more preferably 5% by mass or more and 15% by mass or less. Further, 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. Is more preferable.

Further, the content of used paper pulp derived from a milk carton (milk pack) is preferably more than 0% by mass and 60% by mass or less, more preferably 10% by mass or more and 50% by mass or less, and 20% by mass or more and 40. It is more preferably mass% or less, and 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 60% by mass or more. It is more preferably 80% by mass or less.

Recycled paper pulp derived from milk carton (milk carton) is mainly made of softwood pulp and has the advantage that it is easy to improve the strength of toilet paper 1x, but there is a large variation in quality, and if the content ratio is too high, the quality of the product May affect. By setting the content of the recycled paper pulp derived from the milk carton within the above range, the strength of the toilet paper 1x can be effectively improved while suppressing the variation in quality.

As the above LBKP, pulp formed from a material of the genus Eucalyptus of the family Myrtaceae, represented by Grandis of the genus Eucalyptus and Globulous eucalyptus, is preferable.

In the present invention, deinked pulp derived from newspaper, magazine waste paper, etc. can be blended in a range of 25 parts by mass or less with respect to 100 parts by mass of the recycled pulp derived from NBKP, LBKP, and milk carton. When 25 parts by mass of deinked pulp is blended, the content of deinked pulp in the toilet paper 1x (sheet) is 25 parts by mass / (100 parts by mass + 25 parts by mass) x 100 = 20% by 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. , 0% by mass is most preferable. Since deinked pulp is also used paper, the quality of toilet paper 1x varies greatly by blending it with the pulp raw material. Further, the deinked pulp usually contains a fluorescent dye, and if the content thereof exceeds 20% by mass, the toilet paper 1x may contain a large amount of the fluorescent dye. Therefore, the content of the deinked pulp is preferably 20% by mass or less.

When 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 conforming to ISO 2470 when the surface side of toilet paper 1x is irradiated with a C light source (including ultraviolet light) defined by the CIE (International Commission on Illumination). UV-cut is the whiteness compliant with ISO 2470 when the surface side of toilet paper 1x is irradiated with a C light source through a filter that cuts ultraviolet light having a wavelength of 420 nm or less. The 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 preferable, and 0.0 points or more and 0.5 points or less are most preferable. The whiteness can be measured using a high-speed spectrophotometer CMS-35SPX manufactured by Murakami Color Technology Laboratory Co., Ltd. in accordance with ISO 2470.

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

When a virgin raw material is used as the paper material, the toilet paper 1x can be made by blending softwood kraft pulp and hardwood kraft pulp having a certain range of fiber length and fiber roughness in a specific range. Additives to paper materials include softeners including debonder softeners, bulking agents, dyes, dispersants, dry paper strength enhancers, drainage improvers, pitch control agents, and absorbency, depending on the required quality of the final product. An improver or the like can be used. It is preferable not to use a wet paper strength enhancer. When the used paper raw material is used for the toilet paper 1x, the same treatment as in the case of the virgin type is performed.

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

(Papermaking and creping)
First, the web is made from the above-mentioned paper material on the wire part of a known paper machine and moved to the felt of the press part. Examples of the wire part method include a round net type, a long net (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, a pressure roll without suction, a press roll, or the like, or a dehydration method such as aeration drying with hot air is adopted to continue dehydration. Suction pressure rolls or non-suction pressure rolls are also used as a means of moving the web from the press part to the Yankee dryer.

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

Creping (creating wrinkles called crepes) is the mechanical compression of paper in the vertical direction (the sheet running direction on a paper machine). Then, when manufacturing the web of toilet paper 1x, the web on the Yankee dryer is peeled off by the creping doctor and wound up on the reel part, but the speed difference between the Yankee dryer and the reel part (speed of the reel part ≤ Yankee dryer) Crepes (wrinkles) are formed by the creping doctor depending on the speed.

The quality required for toilet paper 1x, that is, bulk (bulk feeling), softness, water absorption, surface smoothness, aesthetics (crepe shape), etc., depends on the above speed difference. Although it depends on the above conditions such as speed difference, the basis weight of the web on the reel after creaking is approximately 14 g / m ² or more and 21 g / m ² or less, 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, and more preferably 15 g / m ² or more and 18 g / m ² or less. If it exceeds the above range, the strength may increase and the paper may become stiff or the winding density may become too large. If it exceeds the above range, the strength may be weak and the paper may be easily torn, or the usability and bulkiness may be inferior. It may happen.

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 x (Yankee dryer speed (m / min) -reel speed (m / min)) ÷ reel speed (m / min)

The 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 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 wound by the reel part after crepe are set on the machine winder 100, and the two reels are superposed on the machine winder 100 so that the yankee surface is on the outside and are plyed up to form the original roll 12. At this time, after the ply-up, the calendar processing is performed in two stages in the order of the calendar machine 101 of the first stack and the calendar machine 102 of the second stack. Of course, calendar processing may be performed in only one step of either the calendar machine 101 of the first stack or the calendar machine 102 of the second stack. 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 calendar processing) is preferably 0.50 mm / 10 sheets or more and 1.40 mm / 10 sheets or less, more preferably 0.60 mm / 10 sheets or more and 1.20 mm / 10 sheets or less. More preferably, it is 0.60 mm / 10 sheets or more and 0.90 mm / 10 sheets 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.

The paper thickness of the toilet paper 1x before the embossing treatment is the paper thickness of the original roll 12 after the calendering treatment 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 with a measured load of 3.7 kPa, it does not accurately reflect the paper thickness t1 in FIG.

The thickness of the toilet paper 1x after the embossing shown in Tables 1 and 2 corresponds to the paper thickness t2 in FIG. 3, but since it is a value measured with a measured load of 3.7 kPa, the paper thickness t2 is accurate. It is not reflected in.

On the other hand, the depths D1 and D2 of the embossing pattern are measured in the generated state in which the embossing is not compressed. Therefore, the depths D1 and D2 of the embossing pattern are significantly larger than the values calculated from the paper thicknesses t1 and t2 (this value is the value obtained by compressing the embossing with the 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 processing can be performed.

The linear pressure of the calendar is preferably 3.0 kgf / cm or more and 8.0 kgf / cm or less, and more preferably 4.0 kgf / cm or more and 7.0 kgf / cm or less. When the linear pressure is within the above range, the bulkiness of the toilet paper 1x is maintained well, the softness of the toilet paper 1x is good, and the winding diameter DR of the roll is also within an appropriate range. Be maintained. The linear pressure is preferably higher in the second stack than in the first stack, and more preferably 102% or more and 108% or less.

The draw can be adjusted as appropriate during calendar processing. The draw between the reel 11 before the ply-up and the original roll 12 after the calendar processing is preferably 100% or more and 110% or less.

By calendering and draw adjustment, you can manage the basis weight and paper thickness.

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. Since the web is slightly stretched in the roll winding process, the paper thickness is reduced as well as the basis weight before and after winding, but it can be adjusted to the target paper thickness of the toilet roll 1 in the final form by embossing.

The original roll 12 after the calender processing is embossed by, for example, the roll winding processing machine 110 of FIG. 9 to obtain a toilet roll 1. The winding density is determined by the rider roll for sequentially winding the sheet by pressing the base paper roll 13 from the outer peripheral side when winding the base paper roll 13 on the wide base paper roll 13 by the winding mechanism 113 in the roll winding processing machine 110 of FIG. The pressing force of 114 can be adjusted by setting it within a predetermined range.

It goes without saying that the present invention is not limited to the above-described embodiments, but extends to various modifications and equivalents included in the idea and scope of the present invention.

The content of the pulp composition was (mass%) NBKP 10%, LBKP 60%, and waste paper pulp derived from milk carton 30%, and no deinked pulp was contained. Toilet paper and toilet rolls shown in Table 2 were manufactured.

The following evaluations were made.

Longitudinal tensile strength during drying DMDT and lateral tensile strength during drying DCDT: Based on JIS P 8113, the maximum load until breakage was measured in units of N / 25 mm for toilet paper laminated in two 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 (dial thickness gauge "PEACOCK" manufactured by Ozaki Seisakusho). The measurement conditions were a measuring load of 3.7 kPa, a stylus diameter of 30 mm, a sample was placed between the stylus and the measuring table, and a gauge was read when the stylus was lowered at a speed of 1 mm or less per second. For the web before calender processing, 10 sheets are stacked and measured, and after calender processing (after ply-up) and for rolls, 5 sheets (5 sets) of toilet paper with 2 plies of sheets are stacked. I went. Moreover, the measurement was repeated 10 times and the measurement result was averaged.

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

Roll winding diameter DR, core outer diameter DI: Measured using a diamond meter rule manufactured by Muratec KDS Co., Ltd. For the measurement, 10 rolls were measured and the measurement results were averaged.

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

Volume length: The length of 10 sheets was actually measured for the sheets between the perforations of the toilet roll. After that, the number of sheets of the roll was actually measured, and the winding length was calculated proportionally 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, it is 2.275 m × (330/10) = 75 m. If there were no perforations, the winding length was determined 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 core mass was subtracted from the roll mass including the core to obtain the roll mass. As for the roll mass, 10 rolls were measured and the measurement results were averaged. When the roll width W was different from 114 mm, W was converted to 114 mm to obtain the roll mass. 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 114 mm of W.

Sensory evaluation was performed by 20 monitors. The evaluation standard was a maximum of 5 points. It is good if the evaluation standard is 3 points or more.
The measurement of 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 is performed by JIS. This was performed after maintaining the equilibrium state under the temperature and humidity conditions (23 ± 1 ° C., 50 ± 2% RH) specified in P 8111.

The obtained results are shown in Tables 1 and 2.

As is clear from Tables 1 and 2, in the case of each embodiment in which the winding length, winding diameter, winding density, and ratio (D2 / D1) of the toilet roll are within the predetermined ranges, the basis weight of the sheet is not reduced. While improving the softness, the cosmeticity by embossing was maintained, and the winding length per roll could be lengthened.

On the other hand, in the case of Comparative Example 1 in which the winding length was less than 63 m, an embossed pattern having an appropriate depth was given, and the sheet was excellent in softness, but the winding diameter was less than 105 mm, and the roll replacement frequency was high. It became more.

Further, in the case of Comparative Example 2 in which the winding length exceeded 105 m, an embossed pattern having an appropriate depth was given and the sheet was excellent in softness, but the winding diameter exceeded 140 mm and the roll diameter became large and the toilet was used. It became difficult 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 density ^{exceeded 0.32 g / cm 3} , the bulk of the toilet paper was lowered and the softness of the sheet and the roll was lowered.

In the case of Comparative Example 4 in which the depth D1 of the embossed pattern exceeds 0.40 mm and the roll density is ^{less than 0.17 g / cm 3} , the unevenness of the embossed pattern becomes too remarkable and the bulk becomes too high (the density becomes low). The roll diameter of the toilet roll exceeded 140 mm, and the roll diameter became large, making it difficult to fit in the toilet paper holder.

In the case of Comparative Example 5 in which the toilet paper was wound too strongly (hard) with a roll winding machine and the roll density ^{exceeded 0.32 g / cm 3} , the ratio [(D2 / D1) × 100] was 45% or less. As a result, the beauty balance of the embossed roll was lowered, the winding diameter was less than 105 mm, and the softness of the roll was inferior.

In the cases of Comparative Examples 6 and 7 in which the toilet paper was wound too weakly (loosely) with a roll winding machine and the roll density was ^{less than 0.17 g / cm 3} , the winding diameter exceeded 140 mm and the toilet paper was attached to the toilet paper holder. In addition to being inferior in ease of use, in Comparative Example 7, the ratio [(D2 / D1) × 100] exceeded 100%, and the shape retention of the roll was inferior.

In the case of Comparative Example 8 which has a corresponding relationship with Comparative Example 6 in that the winding diameter and the winding density were within the predetermined numerical ranges in the present invention, the fit in the toilet paper holder was good, but the winding length was long. It became less than 63 mm, and the frequency of roll replacement increased.

In the case of Comparative Example 9, which has a corresponding relationship with Comparative Example 3, the point that the winding density and the roll density were within the predetermined numerical ranges in the present invention was that the softness of the roll was good, but the depth of the embossed pattern. The softness of the sheet was inferior because D remained less than 0.01 mm.

When the commercially available products 1 and 2 were evaluated in the same manner, the winding length was less than 63 m in each case, and the frequency of roll replacement increased.

1 Toilet roll 1a Roll front side 1b Roll back side 1e Toilet paper outermost winding edge 1x Toilet paper 11 reel 12 Original roll 13 Base paper roll 100 Machine winder 101 1st stack calendar machine 102 2nd stack calendar machine 110 roll Winding machine 111 Embossed roll 112 Rubber roll 113 Winding mechanism 114 Rider roll 2 Embossed pattern 2R Concave 2P Convex part D1, D2 Depth of embossed pattern

Claims (5)

A toilet roll made by winding toilet paper laminated in two plies and having an embossed pattern in a roll shape.
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 winding density is 1.1 m / cm ² or more and 2.0 m / cm ² or less.
The roll mass per roll width of 114 mm (however, the mass of the core is not included) is 200 g or more and 400 g or less.
The roll density is 0.17 g / cm ³ or more and 0.32 g / cm ³ or less.
The depth D1 of the embossed pattern is 0.01 mm or more and 0.40 mm or less, and the depth D2 of the embossed pattern is 0.01 mm or more and 0.35 mm or less.
A toilet roll in which the ratio of the embossed pattern depth D1 (mm) to the embossed pattern depth D2 (mm) {(D2 / D1) × 100} is 45% or more and 100% or less.
[here,
The depth of the embossing pattern D1 is the depth of the embossing pattern at a position corresponding to 10% of the winding length of the toilet roll from the edge of the outermost wound toilet paper when the toilet roll is unwound.
The depth D2 of the embossing pattern is the depth of the embossing pattern at a position corresponding to 90% of the winding length of the toilet roll from the edge of the outermost wound toilet paper when the toilet roll is unwound. ] The toilet roll according to claim 1, wherein the embossing pattern is a single embossing pattern. The toilet roll according to claim 1 or 2 , wherein the toilet paper contains 40% by mass or more and less than 100% by mass of kraft pulp. The toilet roll according to any one of claims 1 to 3 , which contains more than 0% by mass and 60% by mass or less of used paper pulp derived from a milk carton. C via a whiteness UV-in compliant with ISO 2470 when the surface side of toilet paper is irradiated with a C light source specified by the CIE (International Commission on Illumination) and a filter that cuts ultraviolet light with a wavelength of 420 nm or less. The invention according to any one of claims 1 to 4 , wherein the difference Δ from the whiteness UV-cut conforming to ISO 2470 when the light source is applied to the surface side of the toilet paper is 0.0 points or more and 2.5 points or less. Toilet roll.

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