JP2019130096A - Toilet roll - Google Patents

Abstract

To provide a long toilet roll with high quality in which the rubbing wrinkles due to production process is suppressed satisfactorily, a difference of the quality of paper in an inner rolling area and an outer rolling area is small, and exchange frequency is low.SOLUTION: A toilet roll 1 is provided that is laminated in 2-plies or more, and is obtained by rolling up the toilet paper 1x with the embossed patterns 2 given thereon in a rolled manner. The toilet roll 1 is provided in which a rolling diameter is 90 mm or more and 110 mm or less, a rolling length is 40 mm or more and 63 mm or less, and the mass per one roll except the mass of a core is 140 g or more and 250 g or less. The numerical value obtained by multiplying a value of the smoothness TS750 measured by a tissue softness measuring device TSA of each of the surface and back side of the toilet paper 1x in an inner rolling area F is 72% or more to the numerical value obtained by multiplying the value of the smoothness TS750 of each of the surface and the back side of the toilet paper 1x in an outer rolling area G.SELECTED DRAWING: Figure 11

Description

  The present invention relates to a toilet roll obtained by winding toilet paper laminated in two or more plies into a roll shape.

  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, a long toilet roll has 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, patents) References 1 and 2), a long 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, And Patent Document 3).

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

  However, if the toilet roll is made long in this way, the winding diameter tends to increase. In that case, in the process after the winding is completed, the toilet roll is provided in advance in the existing production line in order to stand still. In addition, the side surface of the toilet roll is easily rubbed against the guide rail, causing rubbing and wrinkling. Also, if the toilet roll is made long, not only the roll diameter but also the roll mass tends to be large, and when the toilet roll is transported by the conveyor, friction with the conveyor is increased due to its own weight, and rubbing wrinkles are likely to occur. There was a problem. Further, when the emboss pattern is applied to the toilet paper, it is more likely to be rubbed and wrinkled due to the uneven portions of the emboss.

  In addition, if the toilet roll is made long, the pressure applied to the inner roll area of the toilet roll increases, and there is a difference in the paper quality of the toilet paper between the inner roll area and the outer roll area. In some cases, the feel and texture may be different at the start and end of use. Accordingly, the present invention provides a long, high-quality toilet roll in which rubbing wrinkles due to the manufacturing process are satisfactorily suppressed, the difference in paper quality between the inner winding region and the outer winding region is small, and the replacement frequency is low. Objective.

  The inventors of the present invention have intensively studied to solve the above problems. As a result, in the toilet roll in which the toilet paper laminated with two or more plies and provided with an embossed pattern is wound in a roll shape, the roll diameter, roll length, and mass of the roll are adjusted, and the inner winding region and the outer winding are further adjusted. It has been found that the above problem can be solved by adjusting parameters calculated from predetermined measurement values in the region, 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 in two or more plies and provided with an embossed pattern into a roll shape, having a winding diameter of 90 mm or more and 110 mm or less, a winding length 40 m to 63 m, the mass per roll excluding the mass of the core is 140 g to 250 g, and the roll length of the toilet roll from the edge of the innermost roll when the roll is unwound An area corresponding to 20% to 30% is an inner volume area, and an area corresponding to 5% to 15% of the roll length of the toilet roll is wound from the edge of the outermost roll paper when unwinding the toilet roll. In the case of the region, the tissue softness measuring device TS for each of the front and back surfaces of the toilet paper in the inner winding region The value obtained by multiplying the value of the smoothness TS750 measured by the above is 72% or more of the value obtained by multiplying the value of the smoothness TS750 of each of the front and back surfaces of the toilet paper in the outer winding region. It is a toilet roll.

  (2) A second aspect of the present invention is the toilet roll according to (1), wherein the toilet paper has a longitudinal tensile strength DMDT in a dry direction based on JIS P 8113 of 2.5 N / It is 25 mm or more and 7.0 N / 25 mm or less.

  (3) The third aspect of the present invention is the toilet roll according to (1) or (2), wherein the toilet paper has a transverse tensile strength DCDT in the dry direction based on JIS P 8113. It is 0.7N / 25mm or more and 3.0N / 25mm or less.

(4) A fourth aspect of the present invention is the toilet roll according to any one of (1) to (3), wherein the basis weight per ply of toilet paper is 11 g / m ² or more and 19 g / m. It is characterized by being ² or less.

  (5) A fifth aspect of the present invention is the toilet roll according to any one of (1) to (4), wherein the value of the smoothness TS750 of the back surface of the toilet paper in the inner winding region is It is 74% or more with respect to the value of the smoothness TS750 of the back surface of the toilet paper in the outer winding region.

  (6) A sixth aspect of the present invention is the toilet roll according to any one of (1) to (5), wherein the toilet paper thickness in the inner winding region is the toilet paper in the outer winding region. It is characterized by being 93% or more with respect to the paper thickness.

  According to the present invention, it is possible to provide a long toilet roll in which rubbing wrinkles due to the manufacturing process are satisfactorily suppressed, the difference in paper quality between the inner winding region and the outer winding region is small, and the replacement frequency is low.

It is a perspective view which shows the external appearance of the toilet roll which concerns on 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 a figure which shows the picked-up image of the inferior goods which the inner winding side of the roll protruded in the axial direction. It is a figure which shows an inner volume area | region and an outer volume area | region typically. It is a figure 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>
FIG. 1 is a perspective view showing an appearance of a toilet roll 1 according to the present invention. The toilet roll 1 of the present invention is a toilet roll 1 in which toilet paper 1x laminated with two or more plies and provided with an embossing pattern is wound into a roll shape, and the winding diameter DR (outer diameter of the roll) is 90 mm or more. 110 mm or less, the winding length (winding length) is 40 m or more and 63 m or less, and the mass per roll excluding the mass of the core (core) is 140 g or more and 250 g or less. In addition, as above-mentioned, the aspect of lamination | stacking is 2 plies or more, More preferably, they are 2 plies or more and 3 plies or less, More preferably, they are 2 plies.

  As shown in FIG. 11, the inner winding region F in this specification refers to the toilet roll from the end edge 1 f (the portion in contact with the core (core) E) of the innermost winding toilet paper 1 x when the toilet roll is unwound. The outer winding region G is an area corresponding to 20% to 30% of the winding length of the paper roll, and the outer winding region G is 5 of the length of the toilet roll from the edge 1e of the outermost toilet paper 1x when the toilet roll is unwound. An area corresponding to 15% to 15%.

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

[Wind length]
When the roll length of the toilet roll 1 is 40 m or more and 63 m or less, the replacement frequency of the toilet roll 1 can be lowered. Further, by adjusting the winding length to the above range, the roll mass becomes appropriate, and when the toilet roll 1 is conveyed by the conveyor, the friction between the toilet roll and the conveyor due to its own weight is suppressed, and the generation of rubbing wrinkles is suppressed. be able to. Moreover, it can suppress that an excessive press is applied to the toilet paper of an inner volume, and can reduce the difference of the touch in an outer volume and an inner volume. In addition, space saving of the toilet roll 1 can be achieved, the winding diameter DR is maintained in an appropriate range, and the toilet roll 1 is sufficiently accommodated in the toilet paper holder. The winding length is preferably 45 m or more and 61 m or less, and more preferably 50 m or more and 59 m or less.

[Winding diameter]
When the roll diameter DR of the toilet roll 1 is not less than 90 mm and not more than 110 mm, a guide rail and a toilet roll provided in advance in an existing production line for allowing the toilet roll 1 to stand still in the process after the winding is completed. Scrubbing with the side surface can be suppressed and generation of rubbing wrinkles can be suppressed, and at the same time, the embossing pattern 2 can be prevented from being crushed and good cosmetics can be maintained. Moreover, it becomes a size that can be easily held by hand, and a toilet roll that can be easily handled by children and elderly people can be obtained. The winding diameter DR is preferably 96 mm or greater and 107 mm or less, and more preferably 100 mm or greater and 104 mm or less.

[Winding density]
In the present invention, the roll density of the toilet roll 1 is preferably 1.0 m / cm ² or more and 2.1 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 roll diameter DR will increase, making it difficult to attach the toilet roll 1 to the toilet paper holder, or the winding force of the inner roll will be too weak. As shown in the photograph of 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) ÷ (cross-sectional area of roll). The cross-sectional area of the roll is represented by {the cross-sectional area of the outer diameter of the roll (winding diameter DR) portion− (the cross-sectional area of the core outer diameter portion)}. The core (paper tube) outer diameter DI is the diameter of the center hole of the roll.

For example, in the case of a winding length of 52 m, 2 plies, a winding diameter DR of 102 mm, and an outer diameter of the core of 39 mm, the winding density = (52 m × 2) ÷ {3.14 × (102 mm ÷ 2 ÷ 10) ² −3.14 × (39 mm ÷ 2 ÷ 10) ² } = 1.49 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 1.0 m / cm ² or more and 2.1 m / cm ² or less, the winding diameter DR is positioned in an appropriate range, and the toilet roll 1 can easily fit in a 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 more preferably 1.2 m / cm ² or more and 1.9 m / cm ² or less, and further preferably 1.4 m / cm ² or more and 1.7 m / cm ² or less.

[Basis weight / paper thickness]
The basis weight per ply of the toilet paper 1x is preferably 11 g / m ² or more and 19 g / m ² or less, and the paper thickness at this time is 0.5 mm / 10 ply or more and 1.2 mm / 10 ply or less. It is preferable. When the basis weight and the paper thickness are in the above ranges, the touch and texture of the toilet roll 1 are well maintained. Moreover, when roll mass becomes an appropriate range and the toilet roll 1 is conveyed with a conveyor, friction with the toilet roll and conveyor by own weight can be suppressed, and generation | occurrence | production of a rubbing wrinkle can be suppressed.

The basis weight per ply of the toilet paper 1x is more preferably 13 g / m ² or more and 17 g / m ² or less, and further preferably 14 g / m ² or more and 16 g / m ² or less. The paper thickness of the toilet paper 1x is more preferably 0.6 mm / 10 ply to 1.1 mm / 10 ply, and still more preferably 0.7 mm / 10 ply to 0.9 mm / 10 ply. To adjust the basis weight per 1 ply of toilet paper and the paper thickness to the above range, the calender conditions (paper thickness and specific volume after calendering, paper thickness difference before and after calendering) and embossing conditions are as follows: The method to prescribe | regulate can be mentioned.

  Further, the paper thickness (per 10 plies) of the toilet paper 1x in the inner winding area F is preferably 93% or more with respect to the paper thickness (per 10 plies) of the toilet paper 1x in the outer winding area G, 94 % Or more is more preferable, and 95% or more is still more preferable. Since the thickness of the toilet paper 1x in the inner winding area F with respect to the outer winding area G is within the above range, a difference in feel and texture when the use of the toilet roll 1 is compared with the end of use is felt. Can be difficult. The paper thickness of the toilet paper 1x in the inner winding region F is smaller than the paper thickness of the toilet paper 1x in the outer winding region G because pressure is applied.

[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. For example, 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 (see FIG. 9). .

  FIG. 3 is a cross-sectional view showing a single embossed embossed 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 of the front surface 1a of the toilet paper 1x and the embossed convex portion 2P of the back surface 1b). Even so, the sheet shown in FIG. 3 (a) in which the base paper is thinned to a paper thickness t1 by calendering and embossed so that the depth D of the embossed pattern becomes deeper is softer and has better texture. 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 increase the depth D of the emboss pattern, it is necessary to reduce the paper thickness t1 per sheet and make the unevenness conspicuous. The softness of the sheet is improved due to the strong calendar process. 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, in the toilet paper 1x, when the embossed concave portion 2R is provided on the outer side of the roll (the roll surface 1a side) where water easily adheres when using a warm water washing toilet seat, the concave portion 2R has a better tactile feel than the convex portion 2P. , 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 1a and the back surface 1b side of toilet paper 1x, each embossing convex surface of each sheet | seat is made inside. Ply 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 emboss pattern, if the depth D of the emboss pattern is decreased, the paper thickness t2 is decreased, 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, a single emboss pattern is preferable from the viewpoint that two-ply lamination can be performed 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 means may be used as long as it imparts irregularities to the surface. May be attached. In this case, the depth of the unevenness may be in a range corresponding to the depth D of the emboss pattern described later.

(Embossed pattern depth D)
The depth D of the embossed pattern is preferably 0.02 mm or more and 0.40 mm or less, more preferably 0.07 mm or more and 0.35 mm or less, and 0.11 mm or more and 0.30 mm or less. Further preferred. When the depth D of the embossed pattern is within the above range, the degree of unevenness of the embossed pattern is suitably maintained, the bulk of the toilet paper 1x becomes appropriate, and the softness of the sheet can be suitably maintained. In addition, the toilet roll 1 can be easily attached to the toilet paper holder. The depth of the embossed pattern is a depth at a predetermined position M1 corresponding to 10% of the roll length of the toilet roll 1 from the edge 1e of the outermost roll of toilet paper 1x of the toilet roll 1 (FIG. 12). reference).

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

  As the microscope, the product name “One-shot 3D measurement macroscope VR-3100” manufactured by KEYENCE can be used. As the microscope image observation / measurement / image analysis software, the product name “VR-H1A” can be used. 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 portion a of the peripheral edge fr of the embossed pattern 2 is obtained. Fig.5 (a) shows the height profile on XY plane by a microscope, and it turns out that the height of the toilet paper 1x surface is represented by the 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 A-B crossing 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 curvature maxima P1 and P2 that protrude upward from the contour curve U and the curvature maxima. The minimum value sandwiched between the points P1 and P2 is obtained and set as the minimum value Min. Furthermore, the average value of the curvature maximum points P1 and P2 is set to the maximum value Max.

  In this way, the depth D of the embossed pattern is set to D = maximum value Max−minimum value Min, and the distance (length) on the XY plane between the curvature maximum points P1 and P2 is defined as the length of the longest portion a. 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 D 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 D of each emboss pattern of the longest portion a and the longest portion b is measured. Of these, the larger value is adopted as the depth D of the emboss pattern. The above measurement is performed for any ten emboss patterns 2 on the roll surface 1a of the toilet paper 1x, and the average value is adopted as the depth D of the final emboss pattern. 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 concave portion can be measured by drawing a line segment AB so as to straddle the embossed pattern in the width W direction orthogonal to the direction in which the embossed pattern is connected (MD direction). Similarly, when the emboss pattern is connected in the width W direction (CD direction), a line segment AB is drawn in the flow direction (MD direction) so as to straddle the emboss pattern, 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. The area ratio of the embossed pattern (the ratio of the portion having the embossed pattern in the toilet paper 1x) is preferably 3% or more and 60% or less, more preferably 7% or more and 45% or less. It is more preferable that it is not less than 30% and not more than 30%. When it is difficult to obtain the area ratio of the embossing pattern of the toilet paper 1x, 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 is maintained moderately, and the cosmetic quality and winding density of the embossed pattern are excellent. 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.

  The shape of the emboss pattern is not particularly limited, such as a rectangle, a square, a round shape, or a long round shape. In addition, the winding diameter DR and the winding density can be adjusted by appropriately adjusting the size of the embossing pattern and the area ratio (number) of the embossing pattern described above.

  When measuring the depth D of the embossed pattern, the measurement surface is the roll surface 1a side, whether it is single embossed or double embossed. Further, when the depth D and the embossed area S of the emboss pattern are obtained, any ten emboss patterns 2 are selected as follows. As shown in FIG. 12, for example, when obtaining the depth D and the embossed area S of the emboss pattern, the winding length of the toilet roll 1 corresponds to 10% from the edge 1e of the outermost roll of toilet paper 1x. 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.

  FIG. 8 shows an example of a machine winder, and FIG. 9 shows an example of a roll winder 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 on a wide base paper roll 13 having the above winding diameter DR by a winding mechanism 113. Taken. 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 roll to be wound by a plurality of other drive rolls from the outside. The wound toilet roll 1 is easy to control the winding diameter, and the production speed becomes 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 DR 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 depth D 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 111 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 depth D of the embossing pattern can be adjusted by narrowing the nip width if the unevenness of the embossing roll is deep, and increasing the nip width if the unevenness of the embossing roll is 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.

  Simultaneously with the roll winder 110, printing, embossing, perforation, tail sealing, and cutting with a predetermined width can be performed, 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 mass]
The roll mass is the mass of the toilet roll 1 per 114 mm of roll width (width of the roll in the core direction) excluding the mass of the core (core). In the toilet roll 1 of the present invention, the mass per roll excluding the mass of the core is 140 g or more and 250 g or less. When the roll mass is in the above range, when the toilet roll 1 is transported by a conveyor, friction between the toilet roll and the conveyor due to its own weight can be suppressed, and generation of rubbing wrinkles can be suppressed. Moreover, basic weight and winding length are maintained appropriately and the replacement frequency of a roll can be made low. The mass per roll excluding the mass of the core is preferably 160 g or more and 220 g or less, and more preferably 180 g or more and 200 g or less.

[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 35 mm or more and 45 mm or less, more preferably 37 mm or more and 42 mm or less, and 38 mm or more and 40 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]
Specific volume of the toilet paper 1x is preferably not more than 3.0 cm ³ / g or more 7.0 cm ³ / g. 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 machine direction when drying toilet paper 1x (sheets laminated in two or more plies) according to JIS P 8113, and DCDT (Dry is the tensile strength in the transverse direction when drying. DMDT is preferably 2.5 N / 25 mm or more and 7.0 N / 25 mm or less, more preferably 3.5 N / 25 mm or more and 6.0 N / 25 mm or less when referred to as “Cross Direction Tensile Strength”. More preferably, it is 0 N / 25 mm or more and 5.5 N / 25 mm or less. The DCDT is preferably 0.7 N / 25 mm or more and 3.0 N / 25 mm or less, more preferably 1.0 N / 25 mm or more and 2.7 N / 25 mm or less, and 1.3 N / 25 mm or more and 2. More preferably, it is 4 N / 25 mm or less. By adjusting DMDT and DCDT within the above ranges, it is possible to suppress the generation of rubbing wrinkles while suitably maintaining the softness of the sheet. 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 toilet paper 1x (sheets laminated in two or more 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 the toilet paper 1x.

[Ease of loosening]
The ease of loosening based on JIS P 4501 when the toilet paper 1x is peeled on 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, the water disintegration property in the toilet is maintained well, and the water resistance when the toilet paper 1x in the use of the warm water-washed toilet seat gets wet with water. The property is also improved.

[Smooth TS750]
In the toilet roll 1 of the present invention, the toilet paper 1x is calculated from the numerical value of the maximum peak intensity (TS750) of the first spectrum from the low frequency side automatically obtained by the software on the tissue softness measuring device TSA. By adjusting the parameters to be adjusted to the following ranges, it is possible to make it difficult to feel the difference in touch and texture when the use start time and the use end time of the toilet roll 1 are compared. That is, in the present invention, the numerical value obtained by multiplying the value of the smoothness TS750 measured by the tissue softness measuring device TSA of each of the front surface 1a and the back surface 1b of the toilet paper 1x in the inner winding region F in the outer winding region G, It is 72% or more with respect to the numerical value obtained by multiplying the values of the smoothness TS750 of the front surface 1a and the back surface 1b of the toilet paper 1x. The numerical value is preferably 77% or more, and more preferably 82% or more. Further, the numerical value in the inner winding region F is smaller than the numerical value in the outer winding region G. Note that the measurement positions of the front surface 1a and the back surface 1b in each of the inner winding region F and the appearance region G do not need to match as long as they are within the range of each region.

  Furthermore, the back surface 1b of the toilet paper 1x in the inner winding region F is smooth so as to make it more difficult to feel the difference in touch and texture when the use of the toilet roll 1 is compared with the end of use. The TS750 value is preferably 74% or more, more preferably 79% or more, and more preferably 84% or more with respect to the smoothness TS750 value of the back surface 1b of the toilet paper 1x in the outer winding region G. More preferably. The above numerical value in the inner winding region F is smaller than the above numerical value in the outer winding region G.

  A measuring method of TS750 using the tissue softness measuring device TSA and a measuring device used therefor are described in detail in, for example, Japanese Patent Application Laid-Open No. 2013-236904. For the measurement method using the tissue softness measuring apparatus TSA, refer to the above-mentioned patent document.

<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.

  Further, the content of waste paper pulp derived from a carton for liquid beverage such as a milk carton is preferably greater than 0% by mass and 60% by mass or less, more preferably from 10% by mass to 50% by mass, and more preferably 20% 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. More preferably, it is at least 80% by mass.

  Waste paper pulp derived from carton for liquid beverages such as milk cartons is mainly composed of softwood pulp and has the merit that it is easy to improve the strength of toilet paper 1x. On the other hand, if the content ratio is too high, May affect product quality. By setting the content of used paper pulp derived from a carton for liquid beverage such as a milk carton to fall within the above range, the strength of the toilet paper 1x can be effectively improved while suppressing variation in quality.

  In addition, as said LBKP, the pulp formed from the genus Eucalyptus eucalyptus represented by Eucalyptus genus Grandis and Eucalyptus globulae 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.

  In addition, in order to ensure an appropriate strength for the toilet paper 1x, the strength can be adjusted by blending raw materials by ordinary 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 the beating is 0 ml or more and 150 ml or less, 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 pressure roll or a press roll without suction, 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 by a Yankee dryer and a Yankee dryer hood, then creped by a creping doctor, and wound on a reel part.

  Creping (creating 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 12 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, more preferably 15 g / m ² or more and 18 g / m ² or less. If it exceeds the above range, the strength may be high and the paper may be stiff. If it is less than the above range, the strength may be weak and it may be easily torn, or the touch and bulk may be inferior.

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)

  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 the toilet paper 1x is preferably 10% or more and 50% or less, more preferably 15% or more and 40% or less, and further 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 with an on-machine calendar before ply-up.

The thickness of the toilet paper 1x before embossing (after calendaring) is preferably 0.5 mm / 10 to 1.2 mm / 10, more preferably 0.6 mm / 10 to 1.1 mm / 10. More preferably, the thickness is 0.7 mm / 10 or more and 0.9 mm / 10 or less. Also, preferably the specific volume of the toilet paper 1x in bulk roll 12 of embossed before (after calendering) is 3.1 cm ³ / g or more 6.7 cm ³ / g or less, more preferably 3.5 cm ³ / g or more 6.4 cm ³ / g or less, more preferably 3.8 cm ³ / g or more and 6.1 cm ³ / g or less.

  Note that the paper thickness of the toilet paper 1x before the embossing process is the paper thickness of the original fabric roll 12 after the calendar process in FIG. 8, and corresponds to the paper thickness t1 of 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 depth D of the emboss pattern is a value measured when the emboss pattern is not compressed. Therefore, the depth D of the emboss pattern is significantly larger than a value 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 calender machines 101 and 102 is preferably composed of two metal rolls, but one of the two rolls may be an elastic roll so that soft calender 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 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.

  During calendar processing, the draw can be adjusted appropriately. 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.

  The basis weight and paper thickness can be managed by calendar processing and draw adjustment.

It is preferable that the basis weight of the web of the raw fabric roll 12 after the calendering process and before the embossing process is 11 g / m ² or more and 20 g / m ² or less per sheet. Since the web is slightly stretched and the basis weight is lowered in the roll winding process described later, it is more preferably 13 g / m ² or more and 18 g / m ² or less, which is slightly higher than the target basis weight of the toilet roll 1 in the final form. / M ² or more and 17 g / m ² or less is more preferable. 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 is a rider roll for sequentially winding sheets by pressing the base paper roll 13 from the outer peripheral side when the roll winding machine 110 of FIG. The pressing force of 114 can be adjusted by setting it within a predetermined range.

  As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range of the invention as described in said embodiment, A various change or It will be apparent to those skilled in the art that improvements can be made. Further, it is apparent from the scope of the claims that embodiments with such changes or improvements can also be included in the technical scope of the present invention.

  The content (mass%) of the pulp composition is NBKP 10%, LBKP 60%, waste paper pulp derived from carton for liquid beverages such as milk cartons, and no deinked pulp is contained. Toilet paper (2 plies) and toilet rolls shown in Tables 1 to 3 were manufactured using the apparatus shown. In forming the emboss pattern, the nip width of the rubber roll facing the emboss roll was unified to 32 mm.

  The following measurements were made. Each measurement was performed after maintaining the equilibrium state under the temperature and humidity conditions (23 ± 1 ° C., 50 ± 2% RH) specified in JIS P8111.

  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, five sets of toilet paper each having a sheet laminated on two plies were stacked, and measurement was performed for 10 plies. The measurement was repeated 10 times and the measurement results were averaged. The measurement position on the roll was a position corresponding to 90% of the roll length of the toilet roll from the edge of the innermost roll of toilet paper when the toilet roll was unwound.

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.

  Longitudinal tensile strength during drying DMDT and transverse tensile strength during drying DCDT: Based on JIS P 8113, the maximum load until break 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.

  Winding length: About the sheet | seat between the perforation of a toilet roll, the length for 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 1.515 m and the number of sheets is 330, 1.515 m × (330/10) = 50 m. When there was no perforation, the winding length was obtained by actual measurement.

  Roll winding 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 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. When the roll width was different from 114 mm, the roll mass was calculated by converting the roll width to 114 mm. For example, when the roll width is 105 mm, the mass obtained by multiplying the roll mass by a coefficient (114/105) is defined as the roll mass per roll width of 114 mm.

  The winding density and TS750 were measured by the above methods. Regarding TS750, for the inner volume area, the position corresponding to 25% of the roll length of the toilet roll from the edge of the innermost toilet paper when the toilet roll is unwound, and for the outer volume area, the toilet roll The position corresponding to 10% of the roll length of the toilet roll was measured from the edge of the outermost roll of toilet paper when the roll was unwound.

  In addition, a numerical value (%) obtained by multiplying a value obtained by multiplying the TS750 value of each of the front and back surfaces of the toilet paper in the outer winding region by a value of each TS750 of the front and back surfaces of the toilet paper in the inner winding region, Inside, it is described as TS750 (front x back inner volume / outer volume). In addition, the TS750 value (%) of the back surface of the toilet paper in the inner volume region relative to the TS750 value of the back surface of the toilet paper in the outer volume region is described as TS750 (back inner volume / outer volume) in the table. doing.

  In addition, in the table, the paper thickness (inner volume / inner volume) of toilet paper in the inner volume area relative to the paper thickness of toilet paper in the outer volume area is described. In the case of taking the data related to the paper thickness, the direction of the inner winding area is the direction from the edge of the innermost toilet paper to the innermost winding starting from a position corresponding to 25% of the roll length of the toilet roll. Five sets of toilet paper were collected and measured by the same method as described above. In addition, for the outer winding area, five sets of toilet paper are collected in the direction toward the outermost winding starting from the position corresponding to 10% of the length of the toilet roll from the edge of the outermost winding toilet paper, It measured similarly.

The sensory evaluation was performed in such a manner that 20 monitors selected “good” or “bad” for each evaluation item. The evaluation criteria are as follows. ◎, ○, and △ were considered acceptable.
◎: When “Good” is 18 or more and 20 or less ○: When “Good” is 14 or more and 17 or less △: When “Good” is 10 or more and 13 or less ×: “Good” is 6 When there are more than 9 people XX: When there is no “good” or more than 5 people

  The obtained results are shown in Tables 1 to 3.

DESCRIPTION OF SYMBOLS 1 Toilet roll 1a Roll surface 1b Roll back surface 1e Edge of outermost roll of toilet paper 1f Edge of toilet roll of innermost roll 1x Toilet paper 11 Reel 12 Original roll 13 Raw 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 D Depth of embossed pattern E Core (core)
F Inner volume area G Outer volume area

Claims (6)

It is a toilet roll that is rolled up into a roll of toilet paper that is laminated in two or more plies and has an embossed pattern.
The winding diameter is 90 mm or more and 110 mm or less, the winding length is 40 m or more and 63 m or less, and the mass per roll excluding the mass of the core is 140 g or more and 250 g or less,
The area corresponding to 20% to 30% of the roll length of the toilet roll from the edge of the innermost roll of toilet paper when unwinding the toilet roll is the inner volume area, and the outermost roll when unwinding the toilet roll In the case where the area corresponding to 5% to 15% of the roll length of the toilet roll from the edge of the toilet paper is the outer winding area,
The value obtained by multiplying the value of the smoothness TS750 measured by the tissue softness measuring device TSA for each of the front and back surfaces of the toilet paper in the inner winding region is the smoothness of each of the front and back surfaces of the toilet paper in the outer winding region. The toilet roll is 72% or more of the value multiplied by the value of TS750.   The toilet roll according to claim 1, wherein the toilet paper has a longitudinal tensile strength DMDT of 2.5 N / 25 mm or more and 7.0 N / 25 mm or less based on JIS P 8113.   The toilet roll of Claim 1 or 2 whose tensile strength DCDT of the transverse direction at the time of drying based on JISP8113 is 0.7N / 25mm or more and 3.0N / 25mm or less of toilet paper. Toys basis weight per ply toilet paper is not more than 11g / ^{m 2} or more 19 g / ^{m 2,} toilet rolls according to any one of claims 1 to 3.   The value of the smoothness TS750 of the back surface of the toilet paper in the inner winding region is 74% or more with respect to the value of the smoothness TS750 of the back surface of the toilet paper in the outer winding region. A toilet roll according to any one of the above.   The toilet roll according to any one of claims 1 to 5, wherein a paper thickness of the toilet paper in the inner winding region is 93% or more with respect to a paper thickness of the toilet paper in the outer winding region.