toilet paper roll

Abstract

A toilet paper roll is provided that, despite being a long roll, exhibits a highly designed pattern and exhibits minimal wrinkling or twisting. This problem is solved by the following toilet paper roll: The roll is formed by rolling two layers of toilet paper into a roll having a roll diameter of 110 mm to 115 mm, wherein a pattern formed by halftone dot printing and solid printing is printed on one side, with the total area ratio of the pattern portion being 10% to 20%, the total area ratio of the halftone dot portion being 7.5% or more, and the total area ratio of the solid portion being 4.0% or less. The single-layer toilet paper has a paper thickness of 60 μm to 90 μm and is wound around a paper tube at a winding density of 0.83 to 2.05 and a roll length of 65 m to 90 m, with the surface printed with the pattern on the outer side.

Description

Technical Field

[0001] The present invention relates to a roll of toilet paper which is formed by rolling toilet paper into a roll shape. Background Art

[0002] Toilet paper rolls are daily necessities, and toilet space is limited; therefore, a longer roll is an important factor in consumers' purchasing decisions.

[0003] The roll length of toilet paper for popular products for general households is usually about 25m in the case of two-layer toilet paper, also known as double-layer, and about 50m in the case of single-layer toilet paper, also known as single-layer. However, in recent years, long strips of toilet paper with a roll length of 1.5 to 3 times this length have also become increasingly popular (see Patent Document 1 below).

[0004] In order to obtain a roll diameter suitable for use in a commonly used household toilet paper holder, such a long toilet paper roll needs to have a low basis weight, a thin paper thickness, and be rolled tightly.

[0005] However, among conventional toilet paper rolls of about 25 m in length and about 50 m in length, there are toilet paper rolls with patterns such as designs printed on the toilet paper with ink (see Patent Document 2 below).

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Publication No. 2018-064664

[0009] Patent Document 2: Japanese Patent Application Laid-Open No. 2008-188070 Summary of the Invention

[0010] Problems to be solved by the invention

[0011] However, in long rolls of toilet paper, as mentioned above, the toilet paper needs to have a low basis weight, be thin, and be rolled tightly. Therefore, when printing patterns, ink print-through may occur, causing unnecessary ink bleeding on the back side.

[0012] Furthermore, thin base paper is coated with ink and then tightly wound, so the paper is easily broken during production and wrinkles and distortions are easily formed.

[0013] Furthermore, since toilet paper rolls are formed by stacking multiple layers of toilet paper, the pattern of the lower layer of toilet paper becomes excessively visible in the long product, and the desired design based on the pattern may not be achieved.

[0014] Therefore, a main object of the present invention is to provide a toilet paper roll that is easy to manufacture, has no wrinkles or twists, and has a pattern with excellent design.

[0015] Means for solving problems

[0016] A first solution to the above-mentioned problem is a toilet paper roll, which is formed by rolling two layers of toilet paper into a roll shape, with a roll diameter of 110 mm to 115 mm, wherein the toilet paper roll is characterized in that:

[0017] A toilet paper with a thickness of 60 μm to 90 μm is wound on a paper tube with a winding density of 0.83 to 2.05 and a roll length of 65 m to 90 m, and a pattern formed by dot printing and solid printing is printed on one surface, the total area ratio of the pattern part is 10% to 20%, the total area ratio of the dot part is 7.5% or more, and the total area ratio of the solid part is 4.0% or less. The paper is printed with the surface printed with the pattern as the outer layer side.

[0018] A second aspect is the toilet paper roll of the first aspect, wherein the void ratio is 5% to 18%.

[0019] Effects of the Invention

[0020] According to the present invention described above, there is provided a toilet paper roll which is easy to manufacture despite being a long roll, has no wrinkles or twists, and has a pattern with excellent design. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a perspective view of a toilet paper roll according to an embodiment of the present invention.

[0022] Figure 2 It is a schematic diagram for explaining the measurement process of whiteness and color difference of the present invention.

[0023] Figure 3 It is a figure for demonstrating the pattern printing of this invention. DETAILED DESCRIPTION

[0024] Hereinafter, the toilet paper roll of the present invention will be described with reference to the accompanying drawings. Figure 1 As shown, the toilet paper roll 1 of the present invention is formed by winding two layers of strip-shaped toilet paper 10 around a paper tube (also called a tube core) 20 in a roll shape.

[0025] The roll diameter L2 (diameter) of the toilet paper of the present invention is 110 mm to 115 mm. The roll diameter of toilet paper roll is stipulated as 120 mm or less in JISP 4501, and the holder for placing general toilet paper rolls is made based on this 120 mm. In the toilet paper roll of the present invention, the roll diameter is 110 mm to 115 mm, which is a size that can be sufficiently placed on a general holder. Here, the roll diameter is a value measured using a circular tape measure manufactured by Muratec KDS Co., Ltd. and its equivalent equipment. The measured value is the average value obtained by measuring at three locations with the position changed in the width direction.

[0026] The roll toilet paper of the present invention is characterized in that a pattern formed by dot printing and solid printing is printed on one surface, the ratio of the total area of ​​the pattern part is 10% to 20%, the ratio of the total area of ​​the dot part is 7.5% or more, and the ratio of the total area of ​​the solid part is 4.0% or less. The toilet paper has a paper thickness of 60 μm to 90 μm and is wound on a paper tube with a winding density of 0.83 to 2.05 and a roll length of 65 m to 90 m in such a way that the surface printed with the said pattern is the outer layer side.

[0027] The toilet paper roll of the present invention has these structures, which reduce the occurrence of ink show-through during pattern printing, reduce the occurrence of unnecessary ink bleeding on the back side, and reduce the occurrence of paper breakage during manufacturing. Furthermore, the roll is free of wrinkles and distortion, and the dot-printed and solid-printed areas are not excessively visible, thereby preventing the pattern of the underlying toilet paper from being excessively visible, resulting in a distinctive design.

[0028] In the roll toilet paper of the present invention, the thickness of a single layer of the rolled toilet paper is 60 to 90 μm. When the thickness of a single layer is within this range, sufficient strength and flexibility are achieved for toilet paper. Furthermore, when a length of 65 to 90 m is wound onto a paper tube, the roll diameter L2 (diameter) can be within the range of 110 to 115 mm. Furthermore, under the pattern printing conditions of the present invention, a product is produced with no ink show-through, no unnecessary ink bleeding on the back side, and a low risk of paper breakage during manufacturing.

[0029] The method for measuring paper thickness is to measure the value of the test piece under the conditions of JIS P 8111 (1998) after conditioning the humidity for more than 8 hours, using a dial thickness gauge (thickness measuring instrument) "PEACOCK G type" (manufactured by Ozaki Seisakusho Co., Ltd.) under the same conditions in a 1-layer state. Specifically, first confirm that there is no dirt, dust, etc. between the plunger and the measuring table, and lower the plunger to the measuring table, move the scale of the dial thickness gauge and align it with the zero point, then raise the plunger, place the sample on the test table, slowly lower the plunger, and read the thickness gauge at this time. During measurement, the plunger is only placed without pressing. The terminal of the plunger is made of metal, and a circular plane with a diameter of 10 mm is perpendicularly abutted against the paper plane. The load during the paper thickness measurement is about 70 gf. In addition, the paper thickness is the average value obtained by measuring 10 times. In addition, even if the toilet paper is formed with concave and convex due to embossing, the measurement is performed in the same way. In this case, the measurement is performed so that the entire concave portion is within the range of the measuring table. The flattening of the concave and convex portions during measurement can also be ignored. In this paper thickness measurement, the paper thickness difference caused by the flattening of the concave portion can also be ignored.

[0030] In the sanitary paper of the present invention, the weight per unit area is preferably 11.5 g / m 2 ~16.0g / m 2 More preferably, it is 12.0 g / m 2 ~15.5g / m 2 If it is 12.5g / m 2 ~16.0g / m 2 Furthermore, in the roll toilet paper of the present invention, the dry tensile strength and wet tensile strength can be appropriately adjusted using known methods within a range that does not hinder the effects of the present invention.

[0031] The toilet paper roll of the present invention has a pattern printed on one surface of the toilet paper, and is wound around a paper tube with the surface printed with the pattern on the outer layer. In other words, the toilet paper roll of the present invention has a pattern only on the outer layer. Printing the pattern on the outer layer allows the pattern to be directly visible from the outside, and in particular, even when the pattern is printed in a thinner manner, such as with halftone printing, it is easily visible.

[0032] Furthermore, toilet paper rolls have multiple layers stacked together, so when the pattern underneath one or more layers is visible through, the pattern on the lower layer and the pattern on the outer surface may be mixed and visible. However, the toilet paper of the present invention is particularly two-layered, so an unprinted layer is sandwiched between the inner layers. Therefore, if the pattern is formed only on the outer layer within the paper thickness range specified in the present invention, the pattern on the outer surface can be fully seen, and the pattern on the lower layer is difficult to see. This is especially true if the weight per unit area is as described above. Furthermore, to have a pattern only on the outer layer, the paper can be rolled up with the printed surface facing the outside.

[0033] The pattern of the present invention is formed by printing and does not include a pattern formed by coloring the papermaking stage by supplying dyes to the papermaking raw materials. The specific design of the pattern is not particularly limited. For example, it can be illustrated by appropriately selecting one or more patterns from plants such as flowers, trees, and grass, living things such as humans, animals, fish, shellfish, and insects, natural objects such as mountains, rivers, seas, clouds, forests, and woods, planets / satellites such as the moon, sun, and stars, and man-made objects such as cars, airplanes, and trams. The area of ​​a pattern is not particularly limited, but if it is 102 mm 2 ~918mm 2 If the ink volume is too high, the pattern will be easily visible, and the design will be excellent. In addition, the amount of ink in one pattern portion will not be excessive, and print-through will not easily occur.

[0034] The pattern of the present invention is formed by dot printing and solid printing. Moreover, the proportion of the total area of ​​the pattern part is 10% to 20%. The pattern part refers to the part that combines the dot part and the solid part. The proportion of the total area refers to the proportion of the pattern part relative to the area of ​​one side of the toilet paper. In addition, due to the manufacturing process, the toilet paper printed with a pattern repeats the pattern at a specified interval. Therefore, the method for calculating the proportion of the total area of ​​the pattern part is to cut 10 sheets as samples every 50 cm from the front end of the toilet paper except the tail seal part, calculate the ratio of the area of ​​the pattern part in each sheet to the area of ​​one side (the width of the toilet paper × 50 cm), and calculate the average value of the 10 sheets. Regarding the measurement of the area of ​​the pattern part in the sample, it is sufficient to optically scan the sample and measure it using known software.

[0035] If the proportion of the patterned portion in the total area is 10% to 20%, the toilet paper will not feel stiff due to the ink application during use. In particular, wrinkles and twists can be prevented during production under the tension required to achieve the roll length, roll diameter, and other roll structures of the present invention. Furthermore, while halftone printing is microscopically composed of ink-applied and non-inked portions, the halftone dot portion in the present invention actually refers to the entire portion of the dot printing that is recognizable as a single pattern, encompassing both the ink-applied and non-inked portions. Furthermore, the ratio of halftone dot to solid area within a single pattern is preferably 60:40 to 90:10, and particularly preferably 65:35 to 85:15.

[0036] The shape of each halftone dot in the halftone dot printing of the present invention is not particularly limited, and may be, for example, rhombus, square, rectangle, circle, ellipse, polygon, star, or the like.

[0037] Furthermore, in the toilet paper of the present invention, the proportion of the total area of ​​the dot portion is 7.5% or more, and the proportion of the total area of ​​the solid portion is 4.0% or less. By setting the proportion of the total area of ​​the dot portion to 7.5% or more and the proportion of the total area of ​​the solid portion to 4.0% or less, the print-through caused by ink application is less likely to occur without reducing the recognizability of the pattern, resulting in excellent design. Furthermore, the toilet paper as a whole does not become excessively hard, and is less likely to wrinkle or twist during manufacturing as described above. Furthermore, when combined with other structures of the present invention to form a toilet paper roll, the result is a toilet paper roll that is easily recognizable as the desired design, without the solid portion being excessively visible through the non-patterned portion of the toilet paper on the outer surface.

[0038] Similarly to the ratio of the total area of ​​the patterned portion, the ratio of the total area of ​​the halftone dot portion to the total area of ​​the solid portion is determined by cutting 10 sheets of toilet paper every 50 cm from the front end, excluding the tail seal, as a sample. The ratio of the area of ​​the patterned portion to the area of ​​one sheet (toilet paper width x 50 cm) is calculated for each sheet, and the average value of these 10 sheets is calculated. The areas of the halftone dot portion and the solid portion of the sample can also be measured by optically scanning the sample and using known software.

[0039] In the present invention, the dot area ratio within the dot portion is 20% to 60%, particularly preferably 30% to 50%. The dot area ratio refers to the proportion of the actual ink-applied portion within the dot portion. A dot area ratio less than 20% results in poor pattern clarity. A dot area ratio exceeding 60% approaches solid printing, resulting in a dot-based pattern that lacks subtlety, diminishes design quality, and tends to become hard. Furthermore, particularly with water-based inks, the water causes the paper to shrink, and at the total area ratio of the pattern described herein, wrinkles and distortions are likely to occur on the paper.

[0040] The pattern on the toilet paper of the present invention is preferably printed using flexographic printing (letterpress printing) using a water-based ink. However, gravure printing, such as gravure printing, or lithographic printing, such as offset printing, may also be used. In particular, if the water-based ink has a viscosity of 10 to 50 cps, a vehicle of 5 to 25% by mass, and a moisture content of 95 to 75% by mass, the pattern can be sufficiently clear, and even if moisture penetrates the paper, wrinkles and distortion are unlikely to occur. The viscosity is a value measured using a B-type viscometer.

[0041] When printing the pattern of the present invention, the number of lines of the anilox roller used is 40 to 100 / 1 inch, more preferably 50 to 80 / 1 inch, regardless of the halftone dot portion or the solid portion. This is suitable for forming the pattern of the present invention.

[0042] The toilet paper roll of the present invention, having the aforementioned pattern, is wound onto a paper tube at a winding density of 0.83 to 2.05 and a roll length of 65 to 90 meters. This 65 to 90-meter roll length is more than twice the length of conventional, two-ply, household-grade toilet paper, which is approximately 25 meters long. The roll length is measured while the roll is unwound without applying tension. For example, the roll can be measured by folding back in a zigzag pattern, 5 meters at a time, starting from the unwound state.

[0043] Furthermore, the toilet paper roll of the present invention has the aforementioned roll length and a winding density of 0.83 to 2.05. It is preferably 1.05 to 1.45, and particularly preferably 1.05 to 1.25. The winding density of the present invention refers to the value calculated by multiplying the actual cross-sectional area by the theoretical cross-sectional area. The actual cross-sectional area is the value calculated by multiplying the roll length by the paper thickness. On the other hand, the theoretical cross-sectional area is the value calculated by (roll diameter / 2)×(roll diameter / 2)×π-(paper tube outer diameter / 2)×(paper tube outer diameter / 2)×π. In other words, it is the area obtained by subtracting the area of ​​the paper tube's open end from the area of ​​the end surface. With the aforementioned roll length, it is particularly easy to produce products with a winding density within the range of 0.83 to 2.05, with minimal wrinkling and twisting. Furthermore, when holding the roll, the circumference feels moderately firm, giving the impression of a solid roll length, without excessive softness or a perceived stiffness. When the density exceeds 2.05, the paper tends to feel stiff compared to the actual roll length. On the other hand, when the value is less than 0.83, the roll feels excessively soft relative to the roll length, and a firm feel is likely to be lost.

[0044] Furthermore, in the toilet paper roll of the present invention, as described above, by setting the total area ratio of the pattern portion of the toilet paper to 10% to 20%, the total area ratio of the halftone dot portion to 7.5% or more, and the total area ratio of the solid portion to 4.0% or less, the pattern is clearly visible, print-through is difficult to detect, and wrinkles and distortion are minimized. Specifically, when increasing the roll length and winding density, the toilet paper needs to be wound around the paper tube with increased tension to form the toilet paper roll. In toilet paper with a pattern, the stretchability of the paper differs between the printed portion (with ink) and the unprinted portion (without ink). Therefore, increasing the tension can easily cause wrinkles and distortion when the toilet paper roll is formed. However, the toilet paper roll of the present invention solves this problem. Specifically, a toilet paper roll is provided that has excellent pattern visibility, no print-through, and a sufficiently soft feel when the toilet paper roll is held, without wrinkles or distortion. In addition, the paper tube outer diameter (paper tube diameter) L3 is preferably the same as the general size. If it is within this range, the winding density of the toilet paper roll of the present invention can be achieved.

[0045] Furthermore, in the roll toilet paper of the present invention, the porosity is preferably 5% to 18%. The porosity (%) of the present invention is a value calculated by (the actual porosity volume of the entire roll) / (theoretical roll volume)×100. The actual porosity volume of the entire roll is calculated by (the actual cross-sectional area (cm 2))×(roll width (cm)), the theoretical roll volume is calculated by (roll length (cm)×2×paper thickness (1 layer, cm))×(roll width (cm)). The void ratio (actual void ratio of the entire roll, %) is calculated by ((theoretical roll volume (cm) 3 ))-(actual roll volume (cm 3 ))) / (theoretical roll volume (cm 3 ))×100(%). The roll width L1 can be about 100mm to 130mm. The void ratio of the present invention is an indicator showing the extent of space in the roll toilet paper. This indicator is adjusted by embossing, paper thickness, and winding hardness. When the paper is thicker, the void ratio decreases, but when there are deep and hard embossings that are difficult to flatten, sometimes the paper layer itself is thicker, and it will feel hard in any case. When the void ratio of the present invention is low, there is a tendency to feel that the roll is harder, and when the void ratio is high, there is a tendency to feel that the roll is softer. In addition, when the void ratio exceeds 18%, the print-through of the pattern becomes significant, it is difficult to identify the design of the roll, and the core is easily offset. When it is less than 5%, it is difficult to show the softness of the roll.

[0046] Furthermore, in the toilet paper of the present invention, preferably, the whiteness of the portion without pattern printing is 80% or more, and the color difference ΔE between the Lab value obtained by directly measuring the pattern printed portion of the lower layer and the Lab value obtained by measuring the pattern printed portion through the white portion without pattern printing of the upper toilet paper is (ΔL) 2 +(Δa) 2 +(Δb) 2 ) 1 / 2 In the range of 2.20 or less. In addition, preferably, the color difference ΔE' between the Lab value obtained by measuring the pattern printing through the white part of the upper toilet paper without pattern printing and the Lab value of the white part of the upper toilet paper without pattern printing is 6.0 or less. When the whiteness, ΔE and ΔE' are such that Figure 3 As shown, the lower layer pattern 40, visible through the unprinted white portion of the upper toilet paper, is not excessively and clearly visible, but rather appears faintly and lightly. At the same time, the pattern composed of solid areas 41 and halftone dots 42, visible directly on the upper layer, is clearly visible. Therefore, the contrast between the directly visible patterns 41 and 42 and the lower layer pattern 40, visible through the white portion of the toilet paper, creates a unique and distinctive design. In particular, when the pattern is printed at a rate of 10% to 20%, the pattern range is not excessively broadened, and the effect created by the contrast between the directly visible printed portion and the printed portion visible through the white portion of the upper layer can be appropriately felt.

[0047] Here, if Figure 2 As shown in the figure, regarding the measurement process of whiteness and color difference ΔE, ΔE' of the present invention, five sheets of white paper 31 are stacked on a horizontal measuring table, and a sample 33 to be measured is stacked on top of them. Then, a toilet paper 34 with a non-patterned portion selected from the same toilet paper roll as the sample 33 is stacked so as to cover the patterned portion 32 to be measured of the sample 33. The white paper 35 is overlapped with the opening portion 36 in such a manner that the pattern portion 32 to be measured is located within the opening portion 36 .

[0048] Then, the whiteness and Lab value of the pattern to be measured are measured from the opening 36 through the toilet paper 34 using a spectral whiteness / colorimeter (the Lab value obtained by measuring the above-mentioned pattern printing through the white part of the upper toilet paper without pattern printing). Next, the toilet paper 34 overlapping with the sample 32 is removed in a manner that does not move the measurement part, and the whiteness and Lab value of the pattern part to be measured are measured using a spectral whiteness / colorimeter (the Lab value obtained by directly measuring the above-mentioned pattern printing part of the lower layer). Next, the sample is further removed, and the whiteness and Lab value of the top layer part on which five sheets of white paper 31 are overlapped are measured using a spectral whiteness / colorimeter (the Lab value of the white part of the upper toilet paper without pattern printing) (blank value). In addition, the spectral whiteness / colorimeter uses a spectral whiteness / colorimeter PF7000 manufactured by Nippon Denshoku Industries Co., Ltd. and its equivalent equipment for measurement. The color differences ΔE and ΔE′ are calculated using the measured Lab values.

[0049] The number of colors that make up the pattern imparted to the toilet paper of the present invention is not limited; however, from the perspectives of cost and equipment, or because toilet paper tends to bleed at low densities, one to three colors are preferred. Furthermore, the colors may differ between the solid and halftone dot portions. Furthermore, when measuring the Lab values ​​of the aforementioned pattern, if a single pattern contains multiple colors, all portions with different colors are measured, and the total measured value may be within the aforementioned numerical range.

[0050] The fibers in the toilet paper of the present invention are not limited, but preferably comprise 70% to 100% by mass of virgin pulp and 0% to 30% by mass of waste paper pulp. When waste paper pulp is mixed, it can be produced more cheaply than pulp composed of 100% by mass of virgin pulp. In addition, in the process of regenerating waste paper from waste paper, the fibers of waste paper pulp tend to become thinner compared to the pulp fibers before regeneration. Due to such fiber properties, the paper thickness does not increase but the fibers become denser, and the paper strength is easily improved. On the other hand, excessive mixing reduces the softness and other hand feel. Therefore, considering the characteristics of waste paper pulp, the mixing ratio can be determined within the range of 0% to 30% by mass. In addition, the type of waste paper pulp is not necessarily limited, but waste paper pulp made from milk carton waste paper and high-quality waste paper is particularly preferred. These are mixed with a large amount of broadleaf kraft pulp (LBKP) from the raw material, so it is easy to exhibit paper strength.

[0051] The raw pulp used can be coniferous kraft pulp (NBKP) and broadleaf kraft pulp (LBKP). The blending ratio of NBKP:LBKP is preferably 20:80 to 50:50. Furthermore, in toilet paper produced using a fiber material composed of this raw pulp and the above-mentioned high-quality waste paper pulp, the content of mechanical pulp derived from waste paper is 5% by mass or less, the ash content is 3% by mass or less, and the brightness is approximately 80% to 85%.

[0052] The toilet paper roll of the present invention can also be embossed. Embossed toilet paper softens the paper itself, and the surface irregularities provide excellent fecal wiping performance. Furthermore, embossed toilet paper creates irregularities on the paper surface, making the underlying pattern less visible through the paper surface and resulting in excellent design.

[0053] The toilet paper roll of the present invention is embossed, but the embossing pattern is not necessarily limited. The embossing may be any suitable pattern, such as micro-embossing, dot-shaped embossing, or design embossing. However, the embossing pattern of the present invention is preferably double embossing, in which two layers are laminated with each layer being embossed. This facilitates achieving the desired roll density and roll hardness.

[0054] Example

[0055] Next, the anti-print-through properties of the examples and comparative examples of the toilet paper rolls of the present invention were examined. The structures and physical properties / compositions of the toilet paper rolls of each example are shown in Table 1 below.

[0056] Regarding the anti-print-through property, the case where ink bleeding to the back side (non-printed side) of the toilet paper could be visually confirmed was judged as ×, and the case where it could not be confirmed was judged as ◯.

[0057] [Table 1]

[0058]

[0059] Examples 1 to 4 used thinner paper thicknesses to lengthen the strips, but by employing halftone printing, they achieved sufficient design with a total pattern area of ​​at least 10% and prevented print-through. In contrast, Comparative Example 1 employed the same total pattern area ratio as Example 1, but employed a fully solid-printed pattern. In Comparative Example 1, print-through was observed.

[0060] In Comparative Example 2, the pattern is composed of halftone dot portions and solid portions, but the ratio of the total area of ​​the solid portions is higher than that of the present invention.

[0061] The ratio of the total area of ​​the patterns in Comparative Examples 3 and 4 is the same as that in Examples 2 and 4, respectively, but the patterns are composed only of solid portions. Show-through was also confirmed in these Comparative Examples.

[0062] In the toilet paper roll of the present invention, it was confirmed that even when the roll is elongated, print-through of the pattern can be prevented.

[0063] Description of Reference Signs

[0064] 1: toilet paper roll; 10: toilet paper; 20: paper tube (tube core); L1: roll diameter (diameter) of toilet paper roll; L2: diameter of the tube core of toilet paper roll; L3: width of toilet paper roll; 31, 32: concave part; 33: valley line part; 40: pattern of the lower layer; 41: solid part of the upper layer; 42: dot part of the upper layer.

Claims

1. A toilet paper roll, which is formed by rolling two layers of toilet paper into a roll, with a roll diameter of 110 mm to 115 mm, wherein the toilet paper roll is characterized by: A toilet paper having a pattern formed by dot printing and solid printing printed on one surface, the proportion of the total area of ​​the pattern part is 10% to 20%, the proportion of the total area of ​​the dot part in the pattern part is 7.5% or more, the proportion of the total area of ​​the solid part in the pattern part is 4.0% or less, and the paper thickness of one layer is 60μm to 90μm. The paper is wound on a paper tube with a winding density of 0.83 to 2.05 and a roll length of 65m to 90m in such a way that the surface printed with the pattern is the outer layer side.

2. The toilet paper roll according to claim 1, wherein: The porosity is 5% to 18%.

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