Toilet roll

Abstract

To provide a double-embossed toilet roll that is favorable in terms of the sense of touch and print decoration properties and that is not easily broken during its manufacture.SOLUTION: A toilet roll of the present invention is a double-embossed 2-ply toilet roll, which includes a pattern print on the surface of surface-side 1-ply toilet paper, which has predetermined values of winding length, 1-ply basis weight, winding diameter, winding density, specific volume, and HF, which has a total length of portions with a thickness of 2 mm or less to be 10 mm to 400 mm when seeing a portion of 3 cm×3 cm in the pattern printed region, and which has, on the pattern-printed surface-side ply, the height of embossments with emboss long sides of 0.1 mm to 5.0 mm to be 0.01 mm-0.15 mm and the number of the embossments to be 11 / cm2-100 / cm2.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a toilet roll having two plies of toilet paper wound into a roll. [Background technology]

[0002] A variety of toilet rolls made of wound long toilet paper (hereinafter referred to as long toilet rolls) have been developed because they can reduce storage space and the number of times the roll needs to be replaced. To make long toilet rolls compact, the winding density must be high and the paper thickness must be low, so the single embossing method, which reduces the specific volume, is widely used (see Patent Documents 1 and 2).

[0003] In the case of the single embossing method (hereinafter referred to as "single embossing"), it feels thinner than the double embossing method (hereinafter referred to as "double embossing"), and the difference between the front and back is large, so the feel in use or the feel is not as good. On the other hand, double embossing makes the product feel thicker, reduces the difference between the front and back, and improves the feel. In the case of double embossing, for example, as described in Patent Document 3, it has been proposed to adjust the cosmetic properties and specific volume of the embossing by changing the embossing patterns on the front and back. Patent Document 4 discloses toilet paper with a reduced basis weight per sheet so that even when two or three sheets are stacked and wound into a roll, they can be wound to the same length as one ply. Patent Document 5 discloses a toilet paper roll in which sheets with different elongation rates are integrated by contact embossing in order to increase the winding length of a double toilet paper roll without reducing the thickness of the toilet paper. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2014-188342 A [Patent Document 2] JP 2016-198409 A [Patent Document 3] JP 2017-196272 A [Patent Document 4] JP 2006-087703 A [Patent Document 5] JP 2013-208297 A Summary of the Invention [Problem to be solved by the invention]

[0005] Printed toilet rolls are aesthetically pleasing and are considered luxury items.

[0006] However, the strength of the printed portion is weakened, which makes the paper more likely to break during production. In particular, when embossing is provided, the weaker printed portion and the weaker embossed portion interact with each other, which makes paper breakage more pronounced during production. This slows down the processing speed and reduces productivity. Also, if the strength of the paper is increased to prevent breaks, breaks are prevented, but the paper becomes hard and the feel is inferior. Also, if the printed area is made smaller without increasing the strength of the paper, breaks are prevented, but the aesthetic quality of the print is reduced. Also, making the embossing thinner (weakening the embossing) can prevent breaks, but this also results in a poor feel.

[0007] Furthermore, if toilet rolls are tightly wound into long lengths, tension is applied during winding, making them easier to break, but adding printing makes them significantly easier to break. Furthermore, in the case of two-ply double embossing, the embossing process is performed on each ply, weakening the strength of each ply of toilet roll (toilet paper), making it easier to break. In the case of single embossing, two plies are embossed, making it twice as strong as one ply, which has the advantage of making it harder to break.

[0008] As described above, it has been difficult to produce a double embossed, compact, long toilet roll that has a good feel and good decorative printing properties.

[0009] Therefore, the present invention has been made in consideration of the above problems, and aims to provide a double embossed toilet roll that is compact and long, yet has a good feel and beautiful printed appearance, and is difficult to break during production. [Means for solving the problem]

[0010] As a result of intensive research, the inventors of the present invention discovered that a two-ply toilet paper having properties within a specific range can solve the above problems, and thus arrived at the present invention.

[0011] That is, (1) the toilet roll of the present invention is a toilet roll in which toilet paper that has been double embossed and is laminated in two plies is wound into a roll, the toilet roll has a pattern printed on one ply of toilet paper on the front side, the roll length is 45 m or more and 93 m or less, and the basis weight of one ply is 11 g / m 2 More than 19g / m 2 The winding diameter is 100 mm or more and 140 mm or less, and the winding density is 0.9 m / cm 2 More than 2.0m / cm 2 The specific volume is 4.3 cm or less. 3 / g or more 7.3cm 3 / g or less, the HF value by TSA is 71 or more and 83 or less, the design is mainly of a thickness of 2 mm or less, and when a 3 cm x 3 cm area of ​​the printed part of the design is viewed, the total length of the parts of the design with a thickness of 2 mm or less is 10 mm or more and 342 mm or less, and in the front ply on which the design is printed, for embossments with a long side of 0.1 mm or more and 5.0 mm or less, the height of the embossment is 0.01 mm or more and 0.15 mm or less, and the number of embossments is 11 / cm or less. 2 More than 100 pieces / cm 2 The following is the result.

[0012] (2) In the above configuration (1), the toilet paper has a paper thickness of 0.6 mm or more per 10 sheets and 1.3 mm or less per 10 sheets. Effect of the Invention

[0013] According to the present invention, it is possible to provide a double embossed toilet roll which is compact and long, yet has a good feel and beautiful printability, and is difficult to break during production. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a perspective view showing the appearance of a toilet roll according to an embodiment of the present invention. [Diagram 2] This is a reference diagram. [Diagram 3] FIG. 2 is a diagram illustrating a method for measuring the pattern printed portion of the toilet roll of the present embodiment. [Figure 4] FIG. 2 is a diagram illustrating the embossed long side of the toilet roll of the present embodiment. [Diagram 5] FIG. 1 is a perspective view showing one embodiment of a toilet roll of the present invention. [Figure 6] FIG. 2 is an enlarged plan view of a ply embossing in one embodiment. [Figure 7] FIG. 11 is a perspective view showing a toilet roll according to another embodiment. [Figure 8] FIG. 13 is an enlarged plan view of a ply embossing according to another embodiment. [Figure 9] FIG. 13 is a perspective view showing measurement points of ply embossing. [Figure 10] FIG. 13 is a perspective view showing measurement points of ply embossing. [Figure 11] FIG. 1 is a diagram showing measurement points of DMDT. [Figure 12] FIG. 1 is a diagram showing measurement points of DCDT. [Figure 13] 1 is a microscopic image showing a cross-sectional profile of a ply embossment. [Figure 14] 1 is a microscopic image showing a cross-sectional profile of a ply embossment. [Figure 15] FIG. 4 is a diagram illustrating details of the ply embossing of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The present invention will be described in detail below.

[0016] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. However, these are presented for illustrative purposes and are not intended to limit the present invention. In addition, the same elements are designated by the same reference numerals throughout the description of the embodiments.

[0017] [Toilet roll] FIG. 1 is a perspective view showing the appearance of a toilet roll 10 of the present embodiment. The toilet roll 10 of this embodiment is double embossed, and as shown in FIG. 1, is made by winding up toilet paper 11 made of two plies (a front ply 11a and a back ply 11b) into a roll.

[0018] (Volume length) The roll length of the toilet roll 10 of the present invention is 45 m or more and 93 m or less. If the roll length is less than 45 m, the frequency of replacement increases. If the roll length exceeds 93 m, when the toilet paper is processed (wound) so that the roll diameter is within a certain range, as in the present embodiment, in the case of a double embossed toilet paper with a printed surface, the roll becomes tightly wound and is likely to break. If the toilet paper is processed (wound) so that the roll diameter does not break, the roll diameter becomes too large and the roll cannot be made compact. The roll length is preferably 53 m or more and 83 m or less, and more preferably 60 m or more and 73 m or less.

[0019] (Roll diameter (roll diameter)) The roll diameter DR of the toilet roll 10 (see FIG. 1) is 100 mm or more and 140 mm or less. In the case of a double embossed toilet paper with a high basis weight having printing as in this embodiment, if the roll diameter is less than 100 mm, the toilet roll 10 will not be replaced as frequently because it will not be long. Or, it will be tightly wound and will be prone to breaking during production. If the roll diameter exceeds 140 mm, it will not be compact. The roll diameter DR is preferably 107 mm or more and 135 mm or less, and more preferably 112 mm or more and 120 mm or less. The roll diameter may be referred to as the roll diameter, but this has the same meaning.

[0020] (winding density) The winding density of the toilet roll 10 of the present invention is 0.9 m / cm 2 More than 2.0m / cm 2 It is preferable that the roll density is 0.9 m / cm or less for a double embossed, high basis weight, and long toilet paper having a print. 2 If it is less than 2.0m / cm, it will not be compact. 2 If it exceeds this limit, the paper will be wound tightly and will be prone to breaking during production.

[0021] Here, the winding density is expressed as (winding length × number of plies) ÷ (cross-sectional area of ​​the roll). The cross-sectional area of ​​the roll is expressed as {cross-sectional area of ​​the outer diameter part of the roll (winding diameter DR) - (cross-sectional area of ​​the outer diameter part of the core)}. The outer diameter DI of the core (paper tube) is the diameter of the center hole of the roll. For example, in the case of a winding length of 61 m, 2 plies, winding diameter DR of 118 mm, and outer diameter of the core of 39 mm, winding density = (61 m × 2) ÷ {3.14 × (118 mm ÷ 2 ÷ 10) 2 -3.14×(39mm÷2÷10) 2}=1.25m / cm 2 If the toilet roll 1 does not have a core, the diameter of the central hole is taken as the outer diameter of the core. Winding density: 1.0m / cm 2 More than 1.6m / cm 2 More preferably, it is 1.2 m / cm or less. 2 More than 1.4m / cm 2 It is even more preferable that:

[0022] (Basic weight) The basis weight of one ply of toilet paper 11 is 11g / m 2 More than 19g / m 2 The following is a result of the present embodiment. In the case of a double embossed toilet paper with a high basis weight having a printed surface, the basis weight of one ply is 11 g / m 2 If it is less than 19g / m, the ink in the printed area will easily spread, and the strength of the printed area will be reduced, making the paper more likely to break during production. Also, the feel will be poor. 2 If the diameter of the roll is greater than this, the roll will be tightly wound and prone to breakage during production if the roll diameter is processed (wound) to be within a certain range. Also, if the roll is processed (wound) to prevent breakage, the roll diameter will be too large and it will not be possible to make it compact. The basis weight of one ply of toilet paper 11 is 13 g / m 2 More than 18g / m 2 More preferably, it is 15 g / m or less. 2 More than 17g / m 2 It is even more preferable that:

[0023] (paper thickness) The thickness of the toilet paper 11 is preferably 0.6 mm / 10 sheets or more and 1.3 mm / 10 sheets or less. In the case of the present embodiment, when the thickness of the toilet paper 11 is less than 0.6 mm / 10 sheets in the case of a double embossed toilet paper with a printed surface and a high basis weight, the ink in the printed portion is likely to spread, and the paper is likely to break during production due to the effect of reduced strength. In addition, when the thickness of the toilet paper 11 exceeds 1.3 mm / 10 sheets, if the toilet paper is processed (wound) so that the roll diameter is within a certain range, the paper is tightly wound and is likely to break during production. In addition, if the toilet paper is processed (wound) so that the paper does not break, the roll diameter becomes large and it is not compact. The thickness of the toilet paper 11 is more preferably 0.7 mm / 10 sheets or more and 1.2 mm / 10 sheets or less, and even more preferably 0.8 mm / 10 sheets or more and 1.1 mm / 10 sheets or less. Methods for adjusting the thickness of the toilet paper 11 to the above range include adjusting the basis weight, embossing conditions, and beating of the pulp raw material.

[0024] (Pattern printing) The design of the toilet paper is preferably printed on the surface of one ply of toilet paper on the front side, and floral patterns are generally used. If a large solid area is provided, the paper is likely to break. In addition, under the conditions of high basis weight, double embossing, and long length as in the present application, by optimizing the total length of the pattern print of thickness 2 mm or less, the paper is less likely to break and the cosmetic properties can be improved. The thickness of the pattern print may include thicknesses of 2 mm or more, but it is preferable that the pattern be mainly of thickness 2 mm or less. By mainly, it is meant that the total length of the long sides of the pattern of thickness 2 mm or less is greater than the total length of the long sides of the pattern of thickness more than 2 mm.

[0025] Let's explain the main part of the design. For example, if the design has two circles with a long side of 5 mm and two straight lines with a long side of 15 mm, the two circles with a long side of 5 mm will total 10 mm, and the two straight lines with a long side of 15 mm will total 30 mm. Therefore, the straight lines with a long total length are the main part of the design. In addition, in the case of a design with two circles whose long sides are 5 mm and one straight line whose long side is 15 mm, the two circles whose long sides are 5 mm total 10 mm, and the one straight line whose long side is 15 mm total 15 mm. Therefore, the straight line with a long total length dominates this design. In the case of a design with one oval whose long side is 10 mm and one straight line whose long side is 15 mm, there is one oval whose long side is 10 mm, totalling 10 mm, and one straight line whose long side is 15 mm, totalling 15 mm. Therefore, the straight line with the longest total length dominates this shape. In addition, in the case of printed toilet paper, by setting the number and depth of embossments of a specific size within an appropriate range, an embossing pattern suitable for the printed design can be obtained, which reduces paper breakage and provides a good feel to the touch.

[0026] When looking at a 3 cm x 3 cm area in the part with a high area of ​​the printed design, it is preferable that the total length of the parts with a thickness of 2 mm or less is 10 mm to 400 mm. In the case of a double embossed high basis weight toilet paper with printing as in this embodiment, if the total length of the parts with a thickness of 2 mm or less is shorter than 10 mm, the cosmetic quality is deteriorated. Also, if the total length of the parts with a thickness of 2 mm or less is longer than 400 mm, the printed part of the design becomes too large and the paper is easily broken during production.

[0027] (Method of measuring the total length of the part with a thickness of 2mm or less for the printed part of the design) For the printed portion of the design, the total length of the parts with a thickness of 2 mm or less shall be measured separately for the straight and curved portions. For straight line parts, measure the straight line in the design as it is. For curved parts in the design as shown in Figure 3(a), measure by drawing a straight line along the curved part as shown in Figure 3(b). In Figure 3, the thickness of the design other than the dots must be 2mm or less. Using a 5mm straight line as a reference, measure along the curve. In the case of Figure 3(b), the total is 5mm + 5mm + 5mm + 2mm = 17mm. In the part with the highest printing area, measure lines of 2mm or less on a 3cm x 3cm piece of toilet paper as described above and find the total length. If there is a dot, it is included in the total length if its diameter is 2 mm or less, but is not included in the total length if the dot has a diameter greater than 2 mm. In the case of Figure 3, the dot has a diameter of 3 mm and is greater than 2 mm, so it is not included in the total length.

[0028] (Double embossed) Here, the double embossing refers to a process in which each of the two plies of base paper is embossed separately. On the surface of the front ply 11a on which the pattern is printed, the number of embossments is 11 per cm 2 More than 100 pieces / cm 2 Preferably, 21 pieces / cm or less. 2 More than 85 pieces / cm 2More preferably, 31 particles / cm or less. 2 More than 70 pieces / cm 2 It is more preferable that the number of embossments on the surface on which the design is printed is 11 / cm or less. 2 If the number of embossments is less than 100 / cm, the touch of the double embossed high basis weight toilet paper having a print as in the present embodiment is inferior. 2 If it is greater, the weaker printed portion and the weaker embossed portion interact with each other, making the paper more susceptible to breakage during production.

[0029] On the other side of the printed pattern, the back side of ply 11b, the number of embossments is 11 per cm 2 More than 100 pieces / cm 2 It is preferable that the number of pieces is 21 pieces / cm or less. 2 More than 85 pieces / cm 2 More preferably, 31 particles / cm or less. 2 More than 70 pieces / cm 2 It is more preferable that the thickness is less than 1 / 2 mm. By reducing the difference between the surface on which the pattern is printed and the other surface, the tactile sensation due to the difference between the front and back sides is improved and the paper is less likely to break during production. It is preferable that the back side ply 11b does not have a pattern printed on it. In the present invention, under the conditions of double embossing, high basis weight, printing, and long length, the number of embosses is 11 / cm in both the front ply 11a and the back ply 11b. 2 By setting the number of embossments at 100 / cm or more, the texture can be improved. 2 By satisfying the above, the paper is less likely to break during production.

[0030] The difference between the number of embossments on the front ply 11a and the number of embossments on the back ply 11b is 0 embossments / cm 2 More than 30 pieces / cm 2 It is preferable that the number of pieces is less than 0 / cm. 2 More than 20 pieces / cm 2 More preferably, 0 pieces / cm 2 More than 10 pieces / cm 2It is even more preferable that the difference between the number of embossments on the front ply 11a and the number of embossments on the back ply 11b is within the above range, so that in a long length toilet paper with double embossing and high basis weight and printing, the difference in feel between the front and back sides is small, providing an overall good feel and usability, and the paper is less likely to break during production.

[0031] (Double embossing height) On the surface of the front ply 11a on which the pattern is printed, the height of the double embossing is preferably 0.01 mm to 0.15 mm, more preferably 0.02 mm to 0.12 mm, and even more preferably 0.03 mm to 0.08 mm. Under the conditions of double embossing, high basis weight, long length, and printed pattern of the present application, if the height of the embossing on the surface on which the pattern is printed is less than 0.01, the tactile feel will be poor. Also, if the height of the embossing is higher than 0.15 mm, the parts where the strength of the printed part is low and the parts where the strength of the embossed part is low interact with each other, making the paper more likely to break during production. In the other backside ply 11b on which no pattern is printed, the height of the double embossing is preferably 0.01 mm to 0.15 mm, more preferably 0.02 mm to 0.12 mm, and even more preferably 0.03 mm to 0.08 mm. By reducing the difference between the surface on which the pattern is printed and the other surface under the conditions of double embossing, high basis weight, long length, and printed pattern of the present application, the tactile sensation due to the difference between the front and back sides is improved. The height of the embossment is measured in the same manner as the method for measuring the depth of the embossed pattern described in JP 2018-047133 A.

[0032] (embossed long side) The number and height of embossments are measured for embossments with a long side of 0.1 mm to 5.0 mm. The long side of the embossment is measured as follows. First, 10 revolutions of the roll surface are removed. One location (assumed to be the center of the roll width) is arbitrarily selected for the toilet paper 11a on the outside of the toilet roll 10, and this location is designated as LS1. The location rotated 90 degrees from this LS1 is designated as LS2, and the locations rotated 90 degrees in the same manner are designated as LS3 and LS4. Test pieces (5 cm x 5 cm) are taken from these four locations, and within a 1 cm x 1 cm area, the areas with the most embossments are visually confirmed from the roll surface side, and observed with an optical microscope. The maximum diameter of the opening of one embossment is designated as the long side of the embossment. FIG. 4 is a diagram illustrating the embossed long side of the toilet roll of this embodiment, where (a) indicates the embossed long side with the symbol a, and (b) indicates the embossed long side with the symbol b.

[0033] For embossments with a long side of 0.1 mm or more and 5.0 mm or less, 2 Count the number of hits and calculate the average value of the four locations. Also, measure the height of any 10 embossments within a 1cm x 1cm area with the long side of the embossment between 0.1mm and 5.0mm. Then, calculate the average value of the above 4 locations (40 locations in total). If there are 100 or more embossments within a 1cm x 1cm area, measure an area of ​​5mm x 5mm and convert to 1cm x 1cm.

[0034] (Perforation) As shown in FIG. 1, the toilet roll 10 of the present invention preferably has perforations 12 for cutting the toilet paper 11 at predetermined intervals in the width direction X of the toilet paper 11. When perforations are provided, the length of the perforation cut line is preferably 0.3 mm or more and 3.5 mm or less, and the length of the perforation joint is preferably 0.3 mm or more and 2.3 mm or less. It is more preferable that the length of the perforation cut line is 0.8 mm or more and 3.0 mm or less, and the length of the perforation joint is more preferably 0.5 mm or more and 1.8 mm or less. It is even more preferable that the length of the perforation cut line is 1.3 mm or more and 2.5 mm or less, and it is even more preferable that the length of the perforation joint is 0.7 mm or more and 1.3 mm or less. The pitch of the perforations (in the MD direction) is preferably 70 mm or more and 280 mm or less, more preferably 85 mm or more and 200 mm or less, and even more preferably 100 mm or more and 130 mm or less. By providing perforations, in double embossed, high basis weight, long toilet paper having printing as in the present application, the areas where the strength of the printed part is weaker and the areas where the strength of the perforations is weaker interact with each other, making the paper more likely to break during production; however, by keeping the perforations within the above range, paper breaks can be prevented and the toilet roll becomes easier to use when in use.

[0035] (Plyenboss) In the toilet roll 10 of this embodiment, as shown in FIG. 5, it is preferable that ply embossments 13 and 14 are applied in the longitudinal direction Y of the toilet paper 11. 6, the roll has a ply embossment 13 consisting of two embossments 13a and 13b parallel to the longitudinal direction Y, and a ply embossment 14 consisting of two embossments 14a and 14b parallel to the longitudinal direction Y. The embossments 13a, 13b, 14a, and 14b are convex on the outer side of the roll. In addition, as shown in Fig. 7, a toilet roll 20 of another embodiment has ply embossments 23 and 24 in the longitudinal direction Y of the toilet paper 21. Specifically, as shown in Fig. 8, the ply embossments include a ply embossment 23 including a plurality of embossments 23a arranged diagonally with respect to the longitudinal direction Y and a plurality of embossments 23b arranged symmetrically to the embossments 23a along the longitudinal direction Y, and a ply embossment 24 including a plurality of embossments 24a arranged diagonally and a plurality of embossments 24b arranged symmetrically to the embossments 24a along the longitudinal direction Y. The embossments 23a, 23b, 24a, and 24b are convex toward the outside of the roll. In the present invention, the term "ply embossing" refers to embossing in which one ply is embossed separately, and then the convex sides of one ply and the convex sides of the other ply are turned inwards to form two plies.

[0036] It is not necessary for the embossments 23a and the embossments 23a to be provided symmetrically, and they may be arranged offset from each other. In addition, in the present invention, two ply embossings are formed near both ends in the width direction X in Figs. 5 to 8, but one or three or more may be formed, and the location where the ply embossing is performed is preferably such that the center M of the width of the ply embossing is located in a range of 2% to 35% from the end, more preferably in a range of 5% to 20%, and even more preferably in a range of 7% to 15%. The shape of each of the embossments (13a, 13b, 14a, 14b) of the ply embossing is not limited to that in the above two embodiments, and may be rectangular, circular, elliptical, or the like.

[0037] (Ply embossing height) In the present invention, the height of the ply embossment is 0.10 mm or more and 0.80 mm or less. Under the conditions of double embossing, high basis weight, long length, and printing as in the present application, if the height of the ply embossment is less than 0.10 mm, the ply will peel off and the paper will be easily broken during production, and if the height of the ply embossment exceeds 0.80 mm, the ply embossment will be too strong and the strength of the ply embossed part will be weakened, which will interact with the parts of the printed part where the strength is low, making the paper easily broken during production. The height of the ply embossment is preferably 0.20 mm or more and 0.65 mm or less, and more preferably 0.30 mm or more and 0.50 mm or less.

[0038] (Method of measuring ply emboss height) The height of the ply embossment is determined by measuring the height difference of the embossment using a microscope. As the microscope, a product name "One Shot 3D Measuring Microscope VR-3100" manufactured by KEYENCE Corporation can be used. As the software for observing, measuring, and analyzing the microscope images, a product name "VR-H1A" can be used. The measurement conditions are a magnification of 12 times, a field of view area of ​​24 mm x 18 mm, and the scanning direction is the X direction of the toilet roll 10. The measurement magnification and field of view area may be changed as appropriate depending on the size of the desired embossed pattern. The measurement points will be explained using the toilet roll 10. The measurement is performed on the ply 11a on the surface side of the roll. The toilet roll 10 is measured in its roll form. Here, the toilet roll 10 has a bulky shape, so it may be difficult to focus the microscope. In this case, the stage (base) on which the sample is placed may be removed to adjust the focus before measurement. First, 10 laps of toilet paper 11 on the surface that is not suitable for measurement are removed. Next, as shown in Figures 9 and 10, one location (the center of the roll width) is arbitrarily selected, designated as LS1, the location rotated 90 degrees from LS1 as LS2, and the positions rotated 90 degrees in the same manner as above as LS3 and LS4. The unevenness of the ply embossments 13 and 14 on both sides of these four locations (LS1, LS2, LS3, LS4) is measured while still in the roll shape. When measuring the unevenness, the area includes the individual ply embossing patterns.

[0039] Using a microscope, a (measured) cross-sectional curve showing continuous unevenness on the surface of an actual sample of toilet paper 11 is obtained, as shown in Fig. 13. Fig. 14 shows a (measured) cross-sectional curve showing the unevenness of the ply embossing in the width direction X of the toilet roll 10, but it also contains noise (steep peaks caused by fiber clumps on the surface of the toilet roll, whisker-like fibers, and areas without fibers), and it is necessary to remove such noise peaks when calculating the height difference of the unevenness. Therefore, a contour curve is calculated from the cross-sectional curve of the height profile, and the height of the embossed pattern is determined as the average value of the values ​​obtained by subtracting the minimum values ​​(a1, a2) from the maximum value (b) on this contour curve, as shown in FIG. 14. The "contour curve" is a curve obtained by removing surface roughness components with wavelengths shorter than λc: 800 μm (where λc is the "filter that defines the boundary between roughness and waviness components" described in JIS-B0601, "3.1.1.2") from the cross-sectional curve using a low-pass filter. Note that if λc is set to be greater than or equal to the width of the ply emboss, there is a risk that the peaks will be recognized as noise, so λc is set to be less than the width of the ply emboss. For example, if the width of the ply emboss is 800 μm or less, λc is set to, for example, 250 μm.

[0040] As shown in FIG. 6, the distance L between the embossment 13a and the embossment 13b (between 14a and 14b) of the ply embossment 13 is 10If the height is 10 mm or less, the height is measured from emboss 13a to emboss 13b, which counts as one measurement location. For each of the four locations (LS1, LS2, LS3, LS4), measurements are taken at two locations (A to H) as shown in Figures 9 and 10, and the average value of the total of eight locations is regarded as the height of the embossed patterns 13 and 14. If there are three or more ply embosses, measurements are taken at 3 or more locations x 4 locations = 12 or more locations.

[0041] In another embodiment of the toilet roll 20, as shown in FIG. 8, the distance L between the embossment 23a and the embossment 23b (between 24a and 24b) is 20 If the height is 10 mm or less, the measurement is made from the embossment 23a to the emboss 23b, which counts as one measurement point. For each of the four points (LS1, LS2, LS3, LS4), measurements are made at two points (A to H) for a total of eight points, and the average value is calculated to determine the height of the ply emboss in the same manner as above.

[0042] On the other hand, the distance L between the embossments 13a and 13b and between the embossments 14a and 14b 10 If the height is greater than 10 mm, measure each of the embosses 13a, 13b, 14a, and 14b. For each of the four locations (LS1, LS2, LS3, and LS4), measure four locations (A to H), so a total of 16 locations are measured and the average value is calculated to determine the height of the ply emboss.

[0043] In another embodiment shown in FIG. 8, the distance L between the embossments 23a and 23b and between the embossments 24a and 24b is also the same. 20 If it is greater than 10 mm, measure 23a, 23b, 24a, and 24b respectively. Measure four points (A to H) for each of the four points (LS1, LS2, LS3, LS4), so measure a total of 16 points, calculate the average value, and use this as the height of the ply embossment.

[0044] (Ply emboss width) The width of the ply embossment of the toilet paper 11 in the present invention is 1 mm or more and 20 mm or less. Under the conditions of double embossing, high basis weight, long length, and printing as in the present application, if the embossment width is less than 1 mm, the ply will be easily peeled off and the paper will be easily broken during production, and if it exceeds 20 mm, the area of ​​the ply embossment will be wide and the strength of the ply embossed part will be easily weakened, which will interact with the part where the printed part has low strength, making the paper more likely to be broken during production. The width of the ply embossment of the toilet paper 11 is preferably 3 mm or more and 16 mm or less, and more preferably 5 mm or more and 12 mm or less.

[0045] (Method of measuring the width of the ply embossing) As with the method for measuring the height of the ply embossment described above, 10 circumferences of toilet paper 11 are removed, and one location (the center of the roll width) is arbitrarily selected, designated as LS1, the portion rotated 90 degrees from LS1 as LS2, and the positions rotated 90 degrees in the same manner as above as LS3 and LS4. Measurements are taken of the ply embossments 13 and 14 (see Figure 5) on both sides of these four areas (LS1, LS2, LS3, LS4) while still in roll shape. At this time, as shown in FIG. 6, the distance L between the ply embossings 13a and 13b (or between the ply embossings 14a and 14b) is 10 If it is 10 mm or less, measurement is made from embossment 13a to emboss 13b to find the distance between one minimum value a1 and the adjacent minimum value a2 in Fig. 14. This is similarly found for 14a and 14b, and then repeated for four more locations (LS1, LS2, LS3, LS4), and the average value of the total eight locations is taken as the width of the ply emboss.

[0046] In another embodiment of the toilet roll 20, as shown in FIG. 8, the distance L between the embossment 23a and the embossment 23b is 20If it is 10 mm or less, measurement is made from embossment 23a to emboss 23b to find the distance between one minimum value a1 and the adjacent minimum value a2 in Fig. 14. This is similarly found for 24a and 24b, and then repeated for four more locations (LS1, LS2, LS3, LS4), and the average value of the total eight locations is taken as the ply emboss width.

[0047] On the other hand, the distance L between the ply embossings 13a and 13b and between the ply embossings 14a and 14b 10 If the minimum value a1 is greater than 10 mm, the distance between one minimum value a1 and the adjacent minimum value a2 in Fig. 14 is determined for each of the embossments 13a, 13b, 14a, and 14b. This is measured at four locations (A to H) for each of the four locations (LS1, LS2, LS3, LS4), so a total of 16 locations are measured and the average value is determined to be the width of the ply emboss.

[0048] In another embodiment shown in FIG. 8, the distance L between the embossments 23a and 23b and between the embossments 24a and 24b is also the same. 20 If it is greater than 10 mm, measure 23a, 23b, 24a, and 24b respectively. Measure four locations (A to H) for each of the four locations (LS1, LS2, LS3, LS4), so a total of 16 locations are measured and the average value is calculated to determine the width of the ply embossment.

[0049] In a pattern in which the ply embossing is symmetrically arranged like the embossings 23a and 23b, the preferred dimensions other than the width are as follows (see FIG. 15). Note that although the description will be given with reference to 23a and 23b, the same applies to 24a and 24b. The longitudinal dimension Le of the embossment 23a (23b) is preferably 1.0 mm or more and 10.0 mm or less, more preferably 1.5 mm or more and 8.0 mm or less, and even more preferably 2.0 mm or more and 6.0 mm or less. The dimension We of 23a (23b) in the short direction is preferably 0.1 mm or more and 4.0 mm or less, more preferably 0.3 mm or more and 3.0 mm or less, and further preferably 0.5 mm or more and 1.5 mm or less. Dimension L of embossment 23a (23b) in MD direction MD is preferably 0.4 mm or more and 7.0 mm or less, more preferably 0.9 mm or more and 5.5 mm or less, and even more preferably 1.4 mm or more and 4.0 mm or less. Dimension L of embossment 23a (23b) in CD direction CD is preferably 0.4 mm or more and 7.0 mm or less, more preferably 0.9 mm or more and 5.5 mm or less, and even more preferably 1.4 mm or more and 4.0 mm or less. Distance L between embossments 23a and 23b 20 is preferably 0.2 mm or more and 5.0 mm or less, more preferably 0.4 mm or more and 3.5 mm or less, and even more preferably 0.6 mm or more and 2.0 mm or less. Distance S between embossments 23a (23b) MD is preferably 0.3 mm or more and 6.0 mm or less, more preferably 0.6 mm or more and 4.2 mm or less, and even more preferably 1.0 mm or more and 3.5 mm or less. The inclination angle θ of the embossment 23a (23b) is preferably 5 degrees or more and 85 degrees or less, more preferably 20 degrees or more and 70 degrees or less, and further preferably 35 degrees or more and 55 degrees or less. By setting the above values, in a toilet roll having a high basis weight, double embossing, long length, and printing conditions as in the present application, the ply is less likely to peel off, and the paper is less likely to break during production. Also, when the portion where the strength of the printed part is reduced and the portion where the strength of the ply embossing is reduced interact with each other, the paper is less likely to break during production.

[0050] (Roll weight) The roll mass is the mass of the toilet roll 10 per 114 mm of roll width (width of the roll in the core direction) excluding the mass of the core. In the toilet roll 10 of the present invention, the mass per roll excluding the mass of the core is 150 g or more and 350 g or less. When the roll mass is within the above range, in double embossing, high basis weight, and long printing as in the present application, if the roll mass is less than 150 g, the roll replacement frequency is poor. Also, if it exceeds 350 g, the winding diameter becomes large and the roll cannot be made compact, or the roll becomes tightly wound, making it easy to break the paper during production. The mass per roll excluding the mass of the core is preferably 180 g or more and 308 g or less, and more preferably 210 g or more and 250 g or less.

[0051] (Roll density) The roll density of the toilet roll 10 is 0.16 g / cm 3 More than 0.26g / cm 3 It is preferable that the density is 0.19 g / cm or less. 3 More than 0.25g / cm 3 More preferably, it is 0.20 g / cm or less. 3 More than 0.23g / cm 3 In the double embossed, high basis weight, printed, and long toilet roll of the present invention, the roll density of the toilet roll 10 is preferably 0.16 g / cm or less. 3 If it is less than 0.26g / cm, it will not be compact. 3 If it exceeds this limit, the roll will be tightly wound and will be prone to breaking during production. The roll mass is the mass of the toilet roll per 114 mm of roll width. The roll volume is expressed as [{cross-sectional area of ​​the roll outer diameter (winding diameter DR) part} - (cross-sectional area of ​​the core outer diameter part)] x roll width (converted per 114 mm). For example, if the roll mass (excluding the core) per 114 mm of roll width is 230 g, the winding diameter is 118 mm, and the core outer diameter is 39 mm, the roll density = 230 g ÷ [{3.14 × (118 mm ÷ 2 ÷ 10) 2 -3.14×(39mm÷2÷10) 2}×(114mm÷10)]=0.207g / cm3 In addition, if the toilet roll 1 does not have a core, the diameter of the central hole is regarded as the outer diameter of the core.

[0052] (Core outer diameter) Furthermore, the core outer diameter, which is the outer diameter of the core of the toilet roll 10 of the present invention, is preferably 25 mm to 48 mm, more preferably 35 mm to 46 mm, and even more preferably 37 mm to 43 mm. By having the core outer diameter within the above range, the toilet roll 10 can be made compact while maintaining a suitable winding density of the toilet roll 10, and in addition, the toilet roll 10 becomes easy to handle during production. The mass of the core of the toilet roll 10 is preferably 3.0 g to 6.5 g, more preferably 4.0 g to 5.8 g, and even more preferably 4.5 g to 5.3 g. By setting the core mass within the above numerical range, it is possible to achieve good core strength and core cost suitable for long toilet paper such as the present invention. The mass of the core is the mass of a roll width of 114 mm, similar to the roll mass.

[0053] (specific volume) The specific volume of toilet paper 11 is 4.3 cm 3 / g or more 7.3cm 3 In the double embossed, high basis weight, printed, and long toilet roll of the present invention, the specific volume of the toilet paper 11 is preferably 4.3 cm3 / g or less. 3 If it is less than 7.3 cm / g, the texture may be poor. 3 If the specific volume exceeds 4.8 cm3 / g, the reel diameter may become too large and the reel may not be compact. Also, if the reel diameter is processed (wound) to be within a certain range, the reel will be tightly wound and will be prone to breakage during production. Also, if the reel is processed (wound) to prevent breakage, the reel diameter will be too large and the reel will not be compact. The above specific volume is 4.8 cm3 3 / g or more 6.8cm 3 / g or less is more preferable, and 5.3 cm 3 / g or more 6.3cm 3It is more preferable that the molecular weight is not more than 1 / g.

[0054] (DMDT (2-ply) not including perforations) If the tensile strength in the machine direction when dry based on JIS P 8113 of the toilet paper 11 is taken as DMDT (Dry Machine Direction Tensile strength), in the toilet roll of the present invention, the DMDT of the area not including the perforations is 2.5 N / 25 mm or more and 6.2 N / 25 mm or less. The DMDT of the area not including the perforations is preferably 3.2 N / 25 mm or more and 5.5 N / 25 mm or less, and more preferably 3.8 N / 25 mm or more and 4.7 N / 25 mm or less. In the case of double embossed, high basis weight, printed, long toilet paper as in the present application, if the DMDT is less than 2.5N / 25mm, the weaker printed parts and weaker embossed parts interact with each other, making the paper more likely to break during production. Also, if the DMDT exceeds 6.2N / 25mm, the feel is poor. 11, when measuring the area 32 not including the perforations 12, the dimension L1 in the MD direction of the area 32 is preferably 100 mm or more. If the perforation pitch P is small, the dimension L1 in the MD direction of the area 32 may be 100 mm or less, but is made as long as possible so as not to include the perforations. The pitch of the grips of the tensile tester is 80 mm, but if the test piece becomes too small if the perforations are not included, the grip pitch may be appropriately reduced. If the grip pitch is less than 20 mm, the grips may be 20 mm and may include the perforations. The dimension W1 of the region 32 in the CD direction is 25 mm. The region 32 is sampled so as not to include the ply emboss. If the ply emboss is included within the 25 mm, it may be included.

[0055] (DMDT (2 ply) including perforations) If the tensile strength in the machine direction when dry based on JIS P 8113 of the toilet paper 11 is taken as DMDT (Dry Machine Direction Tensile strength), in the toilet roll of the present invention, the DMDT of the region including the perforations is 2.5 N / 75 mm or more and 8.3 N / 75 mm or less. The DMDT of the region including the perforations is preferably 3.1 N / 75 mm or more and 7.1 N / 75 mm or less, and more preferably 4.5 N / 75 mm or more and 6.1 N / 75 mm or less. In the double embossed, high basis weight, long toilet paper with printing as in the present application, by providing perforations, the areas where the strength of the printed part is weaker and the areas where the strength of the perforations is weaker interact with each other, making the paper more likely to break during production, but by adjusting the DMDT of the area including the perforations to the above range, it is possible to prevent paper breaks during production. Also, the toilet paper becomes easier to tear at the perforations when it is used. The region DMDT including the perforation is measured in the region 33 including the perforation 12 as shown in Fig. 11. At this time, the measurement is performed at a position including one perforation 12 at the center of the region 33 in the MD direction. The dimension L1 in the MD direction of the region 33 is preferably 100 mm or more, but if the perforation pitch P is small, it is made as long as possible. The dimension W2 in the CM direction of the region 33 is 75 mm.

[0056] (DCDT (2 ply)) If the tensile strength in the dry cross direction of the toilet paper 11 based on JIS P 8113 is DCDT (Dry Cross Direction Tensile strength), then DCDT is preferably 0.7 N / 25 mm or more and 2.0 N / 25 mm or less, more preferably 0.9 N / 25 mm or more and 1.8 N / 25 mm or less, and even more preferably 1.1 N / 25 mm or more and 1.6 N / 25 mm or less. In the case of double embossed, high basis weight, printed, long toilet paper as in the present application, if the DCDT is less than 0.7N / 25mm, the weaker printed parts and weaker embossed parts interact with each other, making the paper more likely to break during production. Also, if the DCDT exceeds 2.0N / 25mm, the feel is poor. As shown in FIG. 12, the measurement area of ​​the DCDT has a dimension L2 in the MD direction of a measurement area 34 of 25 mm. The dimension W2 of the measurement area 34 in the CD direction is preferably 100 mm or more, but is made as long as possible so as not to include the ply embossment. If the ply embossment is included, the pitch of the gripping tools is made smaller for measurement, but is made as large as possible without becoming less than 20 mm.

[0057] (Water absorption) The water absorbency of the toilet paper 11 based on the old JIS S 3104 is preferably 7.0 seconds or less, more preferably 5.0 seconds or less, and even more preferably 3.0 seconds or less. The water absorbency is preferably short. In the double embossed, high basis weight, printed, and long toilet roll of the present application, by keeping the time within the above range, the water absorbency is well maintained and the toilet roll is less likely to break even when absorbing water. When dripping water, drip the water onto the front side of the toilet paper 11 while it is still in two plies.

[0058] (HF (hand feel) value) The HF value measured by the TSA (tissue softness measuring device) of the present invention is preferably 71 or more and 83 or less. In the double embossed, high basis weight, printed and long toilet roll of the present application, if the HF value is less than 71, the touch may be inferior. If the HF value exceeds 83, the roll may be too soft, and the areas with low strength in the printed area and the areas with low strength in the embossed area may interact with each other, making the roll prone to breakage during production. The HF value is more preferably 73 or more and 81 or less, and further preferably 76 or more and 78 or less. The HF value using the tissue softness measuring device TSA is measured by setting the device algorithm to TPII and using a sample processed into a circle with a diameter of about 113 mm. The measuring device used for this is described in detail in, for example, JP 2013-236904 A. The above patent documents can be referred to for the measuring method using the tissue softness measuring device TSA. In addition, when the HF value is calculated, the intensity of the maximum peak of the first spectrum from the low frequency side (TS750), which is automatically obtained by the software on the TSA, is 7 dBV. 2 rms over 30dBV 2 rms or better, 9 dBV 2 rms over 25dBV 2 rms or better, 11 dBV 2 rms over 20dBV 2 It is more preferable that the intensity of the maximum peak (TS7) of the spectrum including 6500 Hz is 6 dBV or more. 2 rms over 29dBV 2 rms is preferred, 8 dBV 2 rms over 24dBV 2 rms is preferred, 10 dBV 2 rms over 19dBV 2 It is more preferable that the stiffness (D) is 1.8 mm / N or more and 3.8 mm / N or less, more preferably 2.1 mm / N or more and 3.5 mm / N or less, and even more preferably 2.4 mm / N or more and 3.2 mm / N or less, when the bladed rotor is pressed from above and 600 mN respectively without rotating the sample of the toilet paper product placed on the sample stage by the TSA, the sample is preferably pressed from above and 3.8 mm / N or less, more preferably 2.1 mm / N or more and 3.5 mm / N or less, and even more preferably 2.4 mm / N or more and 3.2 mm / N or less. By setting TS750, TS7, and D in the above ranges, the touch can be improved and the paper is less likely to break during production.

[0059] (toilet paper) The toilet paper 11 may be made of 100% wood pulp by mass, or may contain recycled paper pulp, non-wood pulp, and deinked pulp. In order to obtain the target quality, the content of NBKP (softwood bleached kraft pulp) is preferably 0% by mass or more and 50% by mass or less, more preferably 10% by mass or more and 40% by mass or less, and even more preferably 20% by mass or more and 30% by mass or less. The content of LBKP (hardwood bleached kraft pulp) is preferably 50% by mass or more and 100% by mass or less, more preferably 60% by mass or more and 90% by mass or less, and even more preferably 70% by mass or more and 80% by mass or less. This blending ratio improves the feel under the double embossing, high basis weight, long length, and printing conditions of the present application, and makes the paper less likely to break during production.

[0060] The content of recycled paper pulp derived from liquid beverage cartons such as milk cartons is preferably 0% by mass or more and 50% by mass or less, more preferably 0% by mass or more and 30% by mass or less, even more preferably 0% by mass or more and 10% by mass or less, and most preferably 0% by mass. This blending ratio provides a good feel under the double embossing, high basis weight, long length, and printing conditions of the present application, and also makes the paper less likely to break during production.

[0061] Recycled paper pulp from liquid beverage cartons such as milk cartons is mainly made of coniferous pulp, and while it has the advantage of easily improving the strength of the toilet paper 11, it varies greatly in quality, and if the content is too high, it can affect the quality of the product. By keeping the content of recycled paper pulp from liquid beverage cartons such as milk cartons within the above range, it is possible to reduce variation in quality.

[0062] As the LBKP, pulp formed from wood species of the genus Eucalyptus in the family Myrtaceae, represented by Eucalyptus grandis and Eucalyptus globulus, is preferred.

[0063] In the present invention, deinked pulp derived from waste paper such as newspapers and magazines can be blended within a range of 25 parts by mass or less to 100 parts by mass of waste paper pulp derived from the above-mentioned NBKP, LBKP, and milk carton. When 25 parts by mass of deinked pulp is blended, the content of deinked pulp in the toilet paper 11 (sheet) is 25 parts by mass / (100 parts by mass+25 parts by mass)×100=20% by mass. The content of 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, even more preferably 0% by mass or more and 5% by mass or less, and most preferably 0% by mass. By using this blending, the touch is improved under the double embossing, high basis weight, long length, and printing conditions of the present application, and the paper is less likely to break during production.

[0064] In order to ensure the appropriate strength of the toilet paper 11, the strength can be adjusted by blending the raw materials by a normal means and beating the pulp fibers. Beating to obtain the target quality can be performed by beating commercially available virgin pulp to reduce the difference in freeness before and after beating to 0 ml or more and 150 ml or less, more preferably 10 ml or more and 100 ml or less, and even more preferably 20 ml or more and 70 ml or less, in terms of the Canadian standard freeness measured according to JIS P 8121. Beating under these conditions improves the feel under the double embossing, high basis weight, long length, and printing conditions of the present application, and makes the paper less likely to break during production.

[0065] When virgin raw materials are used for the stock of the toilet paper 11, softener kraft pulp and hardwood kraft pulp having a certain range of fiber length and fiber coarseness can be blended in a specific range to produce the paper. As additives to the stock, softeners including debonder softeners, bulking agents, dyes, dispersants, dry strength agents, drainage improvers, pitch control agents, absorbency improvers, etc. can be used depending on the required quality of the final product. It is preferable not to use wet strength agents. When recycled paper raw materials are used for the stock of the toilet paper 11, the same processing as in the case of the above virgin system is carried out.

[0066] [How toilet paper is manufactured] The toilet paper 11 can be produced, for example, in the following order: (1) papermaking and creping, and (2) embossing and rolling. Of these, (2) has already been explained, so a description thereof will be omitted.

[0067] (Papermaking and Creping) First, a web is made from the above-mentioned stock on the wire part of a known papermaking machine, and then transferred to a felt in the press part. The type of the wire part can be a cylinder type, a Fourdrinier type, a suction breast type, a short wire type, a twin wire type, a crescent former type, or the like.

[0068] The web is then mechanically compressed with a suction pressure roll, a pressure roll without suction, or a press roll, or the like, or dewatered by a dewatering method such as ventilation drying with hot air, etc. The suction pressure roll or the pressure roll without suction is also used as a means for transferring the web from the press part to a Yankee dryer.

[0069] The web transferred to the Yankee dryer is dried in the Yankee dryer and the Yankee dryer hood, then creped by a creping doctor, and wound up in a reel part.

[0070] Creping (creasing wavy wrinkles called crepes) is a process of mechanically compressing paper in the longitudinal direction (the direction in which the sheet travels on the papermaking machine). When producing a web of toilet paper 11, the web on the Yankee dryer is peeled off by the creping doctor and wound up in the reel part, but crepes (wrinkles) are formed by the creping doctor due to the speed difference between the Yankee dryer and the reel part (speed of the reel part ≦ speed of the Yankee dryer).

[0071] The qualities required for the toilet paper 11, i.e., bulkiness, softness, absorbency, surface smoothness, aesthetics (crepe shape), etc., are affected by the speed difference. Although it depends on the speed difference and other conditions, the basis weight of the web on the reel after creping is approximately 12 g / m 2 More than 20g / 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 More than 19g / m 2 Less than 16g / m, more preferably 2 More than 18g / m 2 It is below. If it exceeds the above range, when it is processed (wound) so that the roll diameter is within a certain range under the conditions of double embossing, high basis weight, long length, and printing as in the present application, it will be tightly wound and will be prone to breaking during production. Also, if it is processed (wound) so that it does not break, the roll diameter will be too large and it will not be compact. If it is below the above range, the strength of the printed part will be reduced and it will be prone to breaking during production. Also, the feel will be poor.

[0072] Here, the crepe ratio based on the speed difference between the Yankee dryer and the reel is defined by the following formula. Crepe rate (%) = 100 x {(Yankee dryer speed (m / min) - reel speed (m / min)} ÷ reel speed (m / min)

[0073] The quality and operability are largely determined by the creping conditions, and the operating conditions that optimize the creping conditions are an important issue for those skilled in the art. In the present invention, the crepe ratio when producing toilet paper 11 is preferably 10% or more and 50% or less, more preferably 15% or more and 40% or less, and even more preferably 20% or more and 35% or less.

[0074] Although the present invention has been described above using the embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope of the invention described in the above embodiments, and it is clear to those skilled in the art that various modifications and improvements can be made to the above embodiments. Furthermore, it is clear from the description of the claims that forms including such modifications or improvements can also be included in the technical scope of the present invention. EXAMPLES

[0075] The toilet paper and toilet roll shown in Table 1 were produced using a pulp composition content (mass%) of 25% NBKP, 75% LBKP, and no waste paper pulp derived from liquid beverage cartons such as milk cartons or deinked pulp.

[0076] Next, the following measurements were carried out. Each measurement was carried out after maintaining the sample in an equilibrium state under the temperature and humidity conditions specified in JIS P 8111 (23±1° C., 50±2% RH).

[0077] (Basic weight) Measured according to JIS P8124 and converted per sheet.

[0078] (paper thickness) The thickness was measured using a thickness gauge (Ozaki Manufacturing's "PEACOCK" dial thickness gauge). The measurement conditions were a measurement load of 3.7 kPa and a gauge diameter of 30 mm. The sample was placed between the gauge and the measurement table, and the gauge was read when the gauge was lowered at a speed of 1 mm per second or less. Ten sheets of toilet paper (five sets of two-ply toilet paper) were stacked together and the measurement was performed for 10 plies. The measurement was repeated 10 times and the results were averaged. The measurement position on the roll was a position equivalent to 90% of the roll length from the edge of the innermost roll of toilet paper when the toilet roll was unwound.

[0079] (specific volume) Divide the thickness of one sheet by the basis weight of one sheet to get the volume per unit g cm 3 This is expressed as:

[0080] (DMDT (2 ply)) The maximum load to break in the measurement area 33 was measured in units of N / 25 mm based on JIS P 8113. The tensile strength was measured at a pulling speed of 300 mm / min.

[0081] (DCDT (2 ply)) The outer side of the two-ply toilet paper was peeled off, and the maximum load until breakage was measured in units of N / 25 mm based on JIS P 8113. The tensile strength was measured at a pulling speed of 300 mm / min.

[0082] (The total length of the parts of the design that are 2mm or less in thickness) The total length of the parts of the printed pattern that were 2 mm or less in thickness was measured separately for straight and curved parts. For straight parts, the straight lines in the pattern were measured as they were, and for curved parts, a straight line was drawn on the curved part as shown in Figure 3(b).

[0083] The number and height of the embossments were measured for embossments with a long side of 0.1 mm or more and 5.0 mm or less.

[0084] (HF value) The area of ​​the toilet paper manufactured in two plies that did not include the perforations and ply embossing was measured using a tissue softness measuring device (TSA (Tissue Softness Analyzer), manufactured by Emtec Electronic Co., Ltd.). When taking the sample, if it is unavoidable to include the perforations and ply embossing, the area that includes them will be measured.

[0085] (Volume length) When perforations were included, the length of 10 sheets was measured for the sheets between the perforations of the toilet roll. The number of sheets in the roll was then measured, and the roll length was calculated proportionally from the length of 10 sheets and the number of sheets. For example, if the length of 10 sheets is 1.140 m and the number of sheets is 535, the result is 1.140 m x (535 / 10) = 61 m. When perforations were not included, measurements were taken.

[0086] (Roll diameter DR, core outer diameter DI) Measurement was performed using a diameter rule manufactured by Muratec KDS Co., Ltd. Ten rolls were measured and the measurement results were averaged.

[0087] (Roll weight) 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 roll mass was determined by subtracting the mass of the core from the roll mass including the core. The roll mass was determined 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 was 105 mm, the roll mass was multiplied by a coefficient (114 / 105) to obtain the roll mass per roll width of 114 mm.

[0088] (winding density) Measurement was performed using the method described above.

[0089] The measurements of basis weight, tensile strength, paper thickness, specific volume, core outer diameter, roll length, roll diameter, roll density, roll density, total length of the part of the pattern with a thickness of 2 mm or less, embossing depth, and embossing length were carried out after maintaining the paper in an equilibrium state under the temperature and humidity conditions specified in JIS P 8111 (23±1°C, 50±2% RH).

[0090] [evaluation] Using toilet rolls, 20 monitors conducted a sensory evaluation by selecting "good" or "bad" for each of the following evaluation items: "frequency of replacement," "feel of toilet paper," "compactness," and "beautiful printing." In addition, the "difficulty of tearing the paper during production" was checked during production and evaluated.

[0091] The evaluation criteria are as follows: 3 or above is considered a pass. 5: When 18 to 20 people say "good" 4: When 14 to 17 people say "good" 3: When 10 to 13 people say "good" 2: When 6 to 9 people say "good" 1: When there are no "good" people or when there are between 1 and 5 people

[0092] The results obtained are shown in Table 1.

[0093] [Table 1] JPEG0007634144000002.jpg242161 [Explanation of symbols]

[0094] 10, 20 toilet rolls 11, 11a, 11b, 21 Toilet paper 12 Perforations 13, 14, 23, 24 Plyemboss 13a, 13b, 14a, 14b Embossed 23a, 23b, 24a, 24b Embossed MD Flow direction CD Horizontal Y Longitudinal direction X Width direction DR Roll diameter DI core outer diameter

Claims

1. A toilet roll in which double embossed toilet paper is wound into a roll, the toilet roll being made of two-ply toilet paper. The toilet paper has a pattern printed on one ply of the front side, The winding length is 45 m or more and 93 m or less, The basis weight of one ply is 11 g / m ２ 19g / m or more ２ is as follows: The winding diameter is 100 mm or more and 140 mm or less, Winding density is 0.9m / cm ２ 2.0m / cm or more ２ is as follows: Specific volume is 4.3 cm ３ / g or more 7.3cm ３ / g or less, HF score by TSA is 71 to 83, The design is mainly a design with a thickness of 2 mm or less, When looking at a 3 cm x 3 cm area of ​​the printed portion of the design, the total length of the parts with a thickness of 2 mm or less is 10 mm or more and 342 mm or less, In the front ply on which the design is printed, the embossment has a long side of 0.1 mm or more and 5.0 mm or less, and the height of the embossment is 0.01 mm or more and 0.15 mm or less, and the number of embossments is 11 / cm ２ More than 100 pieces / cm ２ is as follows: The toilet roll has a roll density of 0.16 g / cm 3 or more and 0.26 g / cm 3 or less.

2. The toilet roll according to claim 1, wherein the toilet paper has a paper thickness of 0.6 mm / 10 sheets or more and 1.3 mm / 10 sheets or less.

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