Toilet roll

Abstract

To provide a toilet roll which is soft even if its wound length is long, and which can be easily cut at a perforation.SOLUTION: There is provided a toilet roll where sheets are laminated by 2 plies, the sheet having weight per 1 ply of 11.0 to 16.5 g / m2, an embossment E2 is formed, and the toilet roll is wound. The toilet roll is configured so that: a paper thickness at 2 plies is 140 to 220 μm, a wound length is 55 m or more, a roll diameter is 110 to 130 mm; in the sheet, a content of 100% pure pulp or recycled pulp is 30% or less. The toilet roll has a perforation, and pulling intensity in a vertical direction of a non-perforation is 1300 to 1800 cN, pulling intensity in a vertical direction of the perforation part is 580 to 780 cN, a pulling elastic modulus in the vertical direction in an entire width of the perforation part is 5.0 to 33.0 Mpa, and a ratio ((perforation part pulling elastic modulus (vertical side) entire width) / (non-perforation part pulling elastic modulus ratio (vertical side) entire width) of pulling elastic modulus in the vertical direction at the entire width of the perforation part to pulling elastic modulus in the vertical direction at the entire width of the non-perforation part, is set to 70.0 to 100.0%.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a toilet roll. [Background technology]

[0002] The standard roll length of toilet rolls is around 25 to 30 m for two-ply products, also known as double. In recent years, some toilet roll consumers have preferred so-called long toilet rolls with roll lengths of around 50 to 60 m, which is twice that of standard products, or around 75 to 90 m, which is three times that of standard products. This is due to the advantages of easy portability after purchase, the benefit of fewer purchases and replacements, and convenient storage space. Longer toilet rolls also have the advantage of saving resources and allowing retailers to compact display space in stores.

[0003] For example, in Patent Document 1, according to the examples, a rolled product is provided with two plies of single embossing, and the basis weight of one ply is 13.5 to 16.5 g / m 2 The winding length is a long winding product of 74 to 91 m (hereinafter also referred to as "conventional long winding product").

[0004] Long-length rolled products, including this type of "conventional long-length rolled product," are embossed to ensure softness. In particular, long-length rolled products, such as "conventional long-length rolled products," which have a roll length about three times that of regular products (hereinafter also referred to as "short-length rolled products"), contain recycled paper pulp and are single-embossed. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6726653 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the case of conventional long rolled products, the roll tends to feel excessively hard when held in the hand, especially as the roll length increases, and consumers may have the impression that the rolled sheet is also hard. Furthermore, in conventional long rolled products, the softness of the sheets is not necessarily sufficient, and there is room for improvement, particularly for consumers who use short rolled products on a daily basis and desire softness.

[0007] In addition, in long rolls including "conventional long rolls," as shown in Figure 6, when a user pulls out toilet paper 110 from a toilet roll 101 attached to a toilet holder and cuts it along perforation m1, as shown in Figures 6(A) to 6(B), the continuous tearing of perforation m1 does not proceed smoothly, and a tear T1 may occur in the vertical direction (the direction in which the toilet paper continues) toward the tip of the toilet paper 110 halfway along perforation m1.

[0008] Therefore, the main object of the present invention is to provide a toilet roll that, despite being a long roll, is easy to feel soft when rolled, exhibits sufficient softness and smoothness in the sheet, can be smoothly separated along the perforations, and is particularly resistant to tearing longitudinally along the perforations. [Means for solving the problem]

[0009] The toilet roll that solves the above problems has the following features. The basis weight of one ply is 11.0 to 16.5 g / m 2 The sheet is laminated in two plies, and an embossment is formed on the two-ply sheet, and the toilet roll is wound up. The paper thickness for two plies is 140 to 220 μm, the roll length is 55 m or more, and the roll diameter is 110 to 130 mm. The sheet is made of 100% pure pulp or contains 30% or less recycled pulp. having perforations, The longitudinal tensile strength across the entire width of the non-perforated portion is 1300 to 1800 cN, and the longitudinal tensile strength across the entire width of the perforated portion is 580 to 780 cN, and The longitudinal tensile modulus of elasticity across the entire width of the perforation is 5.0 to 33.0 MPa; The ratio of the longitudinal tensile modulus of elasticity across the entire width of the perforated portion to the longitudinal tensile modulus of elasticity across the entire width of the non-perforated portion ((perforated portion tensile modulus (longitudinal) entire width) / (non-perforated portion tensile modulus (longitudinal) entire width)) is 70.0 to 100.0%. A toilet roll characterized by: [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a toilet roll that is easy to feel soft even when wound into a long length, exhibits sufficient softness and smoothness in the sheet, can be smoothly separated along the perforations, and is particularly resistant to tearing longitudinally along the perforations. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 10 is a partial cross-sectional view of a single embossed product. [Figure 2] 1 is an example of a partial cross-sectional view of a double embossed product according to an embodiment. [Figure 3] 10(A) and 10(B) are explanatory diagrams of the embossed shape and arrangement. [Figure 4] FIG. 1 is a schematic explanatory diagram of a toilet roll. [Figure 5] FIG. 2 is a schematic explanatory diagram of a measurement area of ​​the surface properties of a sheet. [Figure 6] FIG. 10 is a diagram illustrating vertical tearing at a perforation. [Figure 7] 10A and 10B are diagrams illustrating unintentional tearing during a perforation separation operation. [Figure 8] 10A and 10B are diagrams illustrating unintentional tearing of perforations during a perforation separation operation. DETAILED DESCRIPTION OF THE INVENTION

[0012] Next, an embodiment of the present invention will be described with reference to the drawings. As shown in Figure 4, a toilet roll 1 is made by winding two plies of strip-shaped toilet paper 10 into a roll around a paper tube (also called a tube core) 20. The toilet paper has perforations 11 at predetermined intervals. The roll width L1 is not necessarily limited, but is preferably 100 to 120 mm, and the paper tube diameter L3 is not necessarily limited, but is preferably 35 to 42 mm.

[0013] One embodiment of the toilet roll according to the present invention has a roll length of 55 m or more and a roll diameter L2 of 110 to 130 mm. The upper limit of the roll length is 105 m, with a desirable range of 50 to 90 m, and particularly desirable 50 to 85 m. Furthermore, taking into account the product range, it is also desirable to have a roll length of 55 to 65 mm, which is approximately double-wound, or 70 to 82 m, which is approximately triple-wound. While the roll length of standard 2-ply toilet rolls (short rolls) commercially available as pure pulp products is generally around 25 to 30 m, one embodiment of the toilet roll according to the present invention has a roll length of 55 m or more, making it convenient to carry after purchase and saving storage space.

[0014] The roll diameter is set to 110 to 130 mm in view of the effects of the present invention and in relation to the dimensions of roll holders commonly used in Japan. If it exceeds 130 mm, it may become difficult to mount it on the holder. There is also a limit to the ease of unwinding. The roll diameter is preferably 110 to 125 mm, and particularly preferably 110 to 120 mm in relation to the JIS roll holder dimensions.

[0015] Whether the toilet roll 1 is a long roll or a short roll, it usually has a roll diameter that can be used in a toilet holder. Therefore, due to this roll diameter, long rolls tend to have a lower paper thickness and basis weight than short rolls, and are tightly wound and heavy. Furthermore, when wound on a winder during manufacturing, they are wound with a higher tension than short rolls. For this reason, with long rolls, the strength of the perforated portion of the base paper before winding tends to be set stronger than with short rolls to prevent the paper from breaking at the perforations during manufacturing.

[0016] On the other hand, because the perforations are pulled in the longitudinal direction of the sheet during winding, it is thought that the high tension of a long wound product makes the cut sections more likely to open, which can lead to variations in the shape of the cut sections and the shape of the tie sections between them.In addition, because the sheet is made up of fibers, there is inevitably variation in the fiber orientation near the tie sections.

[0017] Furthermore, because long rolls are tightly wound, it is believed that when toilet paper is pulled from the roll, it relaxes more than short rolls. Also, because long rolls have a greater mass than short rolls, it is more difficult for the roll to start rotating when a user pulls toilet paper from a toilet roll attached to a toilet holder.

[0018] Since short-length rolled products do not require high tension when wound and have a small mass, the strength of the perforations can be set low, they can be easily designed to tear at the perforations, and perforations are less likely to break at unintended locations.However, as mentioned above, in the case of long-length rolled products, the characteristics of the forces applied to the perforations during manufacture, in roll form, and use are significantly different from those of short-length rolled products, and it is thought that this is the cause of the problems regarding perforation tearing that are unique to long-length rolled products.

[0019] In this embodiment, the toilet paper is soft despite being a long roll, and in order to address the problem of tearing at the perforations, and is particularly resistant to tearing lengthwise along the perforations and to facilitate smooth tearing at the perforations, the toilet paper has a longitudinal tensile strength of 1300 to 1800 cN across the entire width of the non-perforated section, a longitudinal tensile strength of 580 to 780 cN across the entire width of the perforated section, a longitudinal tensile modulus of 5.0 to 33.0 MPa across the entire width of the perforated section, and a ratio of the longitudinal tensile modulus of 5.0 to 33.0 MPa across the entire width of the perforated section to the longitudinal tensile modulus of 70.0 to 100.0% ((tensile modulus of tensile modulus of perforated section (length) entire width) / (tensile modulus of tensile modulus of non-perforated section (length) entire width)).

[0020] Here, the total width in the present invention and this specification is the same width as the roll width. From the viewpoint of the effects of the present invention and in relation to general product widths, the roll width of the toilet roll according to the present invention is 105 to 120 mm. Therefore, the total width according to the present invention is a total width within this range.

[0021] The longitudinal tensile strength across the entire width of the non-perforated portion is the longitudinal tensile strength across the entire width of the non-perforated portion between perforations. It is measured in accordance with JIS P 8113:2006 using a test piece with the full width of the paper, i.e., the width of a toilet roll, in the longitudinal direction of the paper (MD), with a chuck distance of 100 mm. The test piece is chucked and attached to the measuring instrument by folding it in half along the longitudinal direction, then in half again along the longitudinal direction, and then folded in quarters before being attached. Examples of measuring instruments include the Minebea Co., Ltd. "Universal Tension and Compression Tester TG-200N" and its equivalents. The tensile strength is measured in the dry state (dry tensile strength). The unit is cN.

[0022] The longitudinal tensile strength across the entire width of the perforated portion is the longitudinal tensile strength across the entire width of the perforated portion. It is measured in accordance with JIS P 8113:2006 using a test piece with the full width of the paper (i.e., the width of the toilet roll) in the machine direction (MD) of the paper, with a chuck distance of 100 mm. The test piece was chucked and attached to the measuring instrument by folding it in half so that the perforations were aligned, then folding it in half again so that the perforations were aligned, and finally folding it in quarters so that the perforations were aligned. The perforation was positioned in the center between the chucks. Examples of measuring instruments include the Minebea Co., Ltd. "Universal Tension and Compression Tester TG-200N" and its equivalents. This tensile strength also indicates the tensile strength when dry (dry tensile strength). The unit is cN.

[0023] If the longitudinal tensile strength across the entire width of the non-perforated sections is 1300 to 1800 cN and the longitudinal tensile strength across the entire width of the perforated sections is 580 to 780 cN, the paper will have sufficient strength during use. Desirably, the longitudinal tensile strength across the entire width of the non-perforated sections is 1400 to 1750 cN and the longitudinal tensile strength across the entire width of the perforated sections is 590 to 700 cN. In toilet rolls, the continuous direction (longitudinal direction) of the toilet paper is the longitudinal direction of the paper. Therefore, the longitudinal tensile strength is the tensile strength in the direction in which the perforations are separated. If the longitudinal tensile strengths of the perforated and non-perforated sections are within the above ranges, the paper can be manufactured without tearing and can be easily torn open smoothly along the perforations.

[0024] The ratio of the longitudinal tensile strength across the entire width of the perforated section to the longitudinal tensile strength across the entire width of the non-perforated section ((tensile strength (longitudinal) across the entire width of the perforated section) / (tensile strength (longitudinal) across the entire width of the non-perforated section)) is not necessarily limited, but an excessive difference is undesirable, and a ratio of 36.0 to 47.0% is preferable. A ratio of 38.0 to 45.0% is particularly preferable. When the winding length is 55 to 65 m, a ratio of 38 to 43% is also preferable.

[0025] The longitudinal tensile modulus across the entire width of the perforated portion is the longitudinal tensile modulus in the area where the perforations are formed. It is measured in accordance with JIS P 8113:2006 using a test piece with the entire width of the paper, i.e., the width of the toilet roll, in the longitudinal direction of the paper (MD direction) with a chuck distance of 100 mm. The test piece was chucked and attached to the measuring instrument by folding it in half so that the perforations were aligned, then folding it in half again so that the perforations were aligned, and finally folding it in quarters so that the perforations were aligned, and then attaching it so that the perforations were centered between the chucks. Examples of measuring instruments include the Minebea Co., Ltd. "Universal Tension and Compression Tester TG-200N" and its equivalents. The tensile modulus is measured in dry condition. The tensile modulus is determined from the ratio of the tensile load per unit area (cross-sectional area) to the continuously recorded elongation per unit length. It is calculated from the maximum slope of the elongation-load curve and is the Young's modulus calculated using the following formula (A): Tensile modulus = (elongation (mm) / distance between chucks (mm)) x (maximum slope of load-elongation curve (N / mm)) / (test piece width (mm) x test piece thickness (mm))... (A) The tensile modulus is expressed in MPa. The test piece thickness here is the paper thickness measured at 100 kPa according to JIS P 8118.

[0026] The longitudinal tensile modulus across the entire width of the non-perforated section is the longitudinal tensile modulus in the unperforated areas between the perforations. It is measured in accordance with JIS P 8113:2006 using a test piece with the full width of the paper, i.e., the width of a toilet roll, in the longitudinal direction (MD) of the paper, with a chuck distance of 100 mm. The test piece is chucked and attached to the measuring instrument by folding it in half along the longitudinal direction, then in half again along the longitudinal direction, and then folded in quarters before attachment. Examples of measuring instruments include the Minebea Co., Ltd. "Universal Tension and Compression Tester TG-200N" and its equivalents. This tensile modulus is also a dry value. The longitudinal tensile modulus across the entire width of the non-perforated section, like the longitudinal tensile modulus across the entire width of the perforated section, is calculated from the continuously recorded tensile strength (tensile load) and elongation, and is the Young's modulus calculated using the above formula (A).

[0027] When the ratio of the longitudinal tensile modulus across the entire width of the perforated portion to the longitudinal tensile modulus across the entire width of the non-perforated portion ((tensile modulus (longitudinal) across the entire width of the perforated portion) / (tensile modulus (longitudinal) across the entire width of the non-perforated portion)) is 70.0 to 100.0%, when the toilet paper is pulled at a position including the perforations to cut it, it tears smoothly along the perforations, and in particular, event T1, where the paper tears longitudinally along the perforation m1, as shown in Figures 6(A) and (B), is less likely to occur. A more desirable ratio of the longitudinal tensile modulus across the entire width of the perforated portion to the longitudinal tensile modulus across the entire width of the non-perforated portion ((tensile modulus (longitudinal) across the entire width of the perforated portion) / (tensile modulus (longitudinal) across the entire width of the non-perforated portion)) is 80 to 98%, and an especially desirable value is 86 to 97%. The ratio of the longitudinal tensile modulus across the entire width of the perforated portion to the longitudinal tensile modulus across the entire width of the non-perforated portion is the ratio of the ease of stretching in response to pulling in the perforated portion to the non-perforated portion. Within this range, when pulling the toilet paper at a position including the perforations to cut it, the perforated portion deforms appropriately relative to the non-perforated portion. Specifically, the perforations deform so as to open. Furthermore, in combination with other configurations of the present invention, within this range, tearing along the perforations begins after appropriate deformation in each portion, and the tearing progresses continuously, resulting in smooth tearing along the perforations, and is particularly unlikely to tear longitudinally along the perforations. If this value is less than 70.0%, the paper is more likely to tear with a winder or break at unintended perforations during processing. Furthermore, the perforated portion deforms too much before tearing. That is, at the perforations, the elongation at the tie portion is excessively large compared to the cut portion, making it difficult for the tie portion to tear smoothly along the perforations without tearing, and the tie portion in particular is likely to become the starting point for vertical tears. If it exceeds 100.0%, the perforations will not tear easily even when the intended force is applied during use, or the tearing will progress too quickly after it has started, causing tears to occur in areas other than the perforations, and in particular the phenomenon of vertical tearing midway along the perforations may not be sufficiently improved.

[0028] Specifically, the longitudinal tensile modulus of elasticity across the entire width of the perforation is 5.0 to 33.0 MPa. When the roll length is 55 to 65 m, 5.0 to 15.0 MPa is also desirable. If it exceeds 33.0 MPa, the perforation is stiff to stretch. Furthermore, the length of the tie portion of the perforation must be adjusted to be small, which is undesirable as it tends to lead to variations in perforation strength. If it is less than 5.0 MPa, the perforation is easily stretched, which is undesirable as it tends to tear excessively at the perforation.

[0029] The specific tensile modulus of elasticity in the longitudinal direction across the entire width of the non-perforated portions is not limited, but is preferably 5.5 to 36.0 MPa in relation to the above-mentioned preferred tensile modulus of elasticity in the longitudinal direction across the entire width of the perforated portions. When the winding length is 55 to 65 m, a value of 6.0 to 15.5 MPa is also desirable.

[0030] In the toilet roll of the embodiment, the paper is soft despite being a long roll, and to make it easier to tear open at the perforations, the ratio of the amount of tensile energy absorbed in the longitudinal direction across the entire width of the perforated sections to the amount of tensile energy absorbed in the longitudinal direction across the entire width of the non-perforated sections ((tensile energy absorption amount (longitudinal) across the entire width of the perforated sections) / (tensile energy absorption amount (longitudinal) across the entire width of the non-perforated sections)) is preferably 13.5% to 25.0%, more preferably 13.5% to 22.0%. When the roll length is 55 to 65 m, a ratio of 13.8 to 16.0% is also preferable.

[0031] The longitudinal tensile energy absorption across the entire width of the perforated portion is the longitudinal tensile energy absorption in the area where the perforations are formed. It is measured in accordance with JIS P 8113:2006 using a test piece whose width is the entire width, i.e., the width of the toilet roll, in the longitudinal direction (MD) of the paper, with a chuck distance of 100 mm. When fastening the test piece to the measuring instrument, it is folded in half so that the perforations are aligned, then folded in half again so that the perforations are aligned, and finally folded in quarters so that the perforations are aligned, and attached so that the perforations are positioned in the center between the chucks. Examples of measuring devices include the Minebea Co., Ltd. "Universal Tension and Compression Tester TG-200N" and its equivalents. The tensile energy absorption is measured in dry conditions. The tensile energy absorption is calculated as the work per unit area (J / m) required to tensile to break. 2 ) The tensile energy absorption is calculated from the area of ​​the continuously recorded elongation-load curve up to the maximum tension, and is also the integral of the elongation-load curve up to the break of the test piece. Therefore, the tensile load and elongation are continuously measured during the tensile test until breakage occurs, and the measured values ​​are plotted to obtain a curve, which can be used to calculate the tensile energy absorption.

[0032] The longitudinal tensile energy absorption across the entire width of the non-perforated section is the longitudinal tensile energy absorption in the non-perforated areas between the perforations. It is measured in accordance with JIS P 8113:2006 using a test piece with the full width of the paper, i.e., the width of a toilet roll, in the longitudinal direction (MD) of the paper, with a chuck distance of 100 mm. The test piece was chucked and attached to the measuring instrument by folding it in half longitudinally, then in half again longitudinally, and then folded in quarters before being attached. Examples of measuring instruments include the Minebea Co., Ltd. "Universal Tension and Compression Tester TG-200N" and its equivalents. The tensile energy absorption is also measured in the dry state. The tensile energy absorption is calculated in the same manner as for the perforated section.

[0033] If the ratio of the amount of tensile energy absorbed in the vertical direction across the entire width of the perforated section to the amount of tensile energy absorbed in the vertical direction across the entire width of the non-perforated section ((tensile energy absorbed in the vertical direction across the entire width of the perforated section) / (tensile energy absorbed in the vertical direction across the entire width of the non-perforated section)) is 13.5% to 25.0%, when the toilet paper is pulled at a position including the perforations to cut it, it will tear smoothly along the perforations, and as shown in Figures 7(A) to (C), tearing T2 will be less likely to occur in the area where the user is holding the paper when trying to cut it at the perforation m1 or in the vicinity Z1. The amount of tensile energy absorbed is the amount of work per unit area required to pull and break the paper. Within the above range, when pulling at a position including the perforations to cut the toilet paper, the ratio of the work required to tear the perforated and non-perforated portions is within an appropriate range, and the pulling force from the portion the user is holding and its vicinity is likely to be applied firmly to the perforations, causing the tearing to proceed continuously and resulting in a smooth tear at the perforations, and is presumably particularly unlikely to cause tearing at the portion the user is holding or its vicinity, particularly tearing starting from the perforations, as shown in Figure 7. If this value is less than 13.5%, the amount of tensile energy absorbed in the vertical direction across the entire width of the perforated portion is too small compared to the amount of tensile energy absorbed in the vertical direction across the entire width of the non-perforated portion, making it more likely to tear at the perforations in unintended locations. If it exceeds 25.0%, the amount of tensile energy absorbed in the vertical direction across the entire width of the perforated portion will be too large compared to the amount of tensile energy absorbed in the vertical direction across the entire width of the non-perforated portion, and when the user tries to cut along the intended perforation, the amount of tensile energy absorbed in the portions other than the perforations will be large and the material will be less likely to tear, making it difficult to tear at the perforations and increasing the force applied to the fingertips at hand, making it more likely to tear in the portion the user is holding, and this may particularly result in breakage in the portion the user is holding or in the vicinity thereof, which was not intended by the user.

[0034] The specific amount of tensile energy absorption in the longitudinal direction across the entire width of the perforation is not necessarily limited, but this amount of tensile energy absorption is preferably 1.0 to 12.5 J / m 2 More preferably, it is 1.0 to 8.5 J / m 2When the winding length is 55 to 65 m, it is 1.0 to 5.0 J / m 2 The amount of tensile energy absorption in the longitudinal direction across the entire width of the non-perforated portion is not necessarily limited, but is preferably 9.0 to 60.0 J / m 2 Within these ranges, it is more preferable that the ratio of the amount of tensile energy absorbed in the longitudinal direction across the entire width of the perforated portion to the amount of tensile energy absorbed in the longitudinal direction across the entire width of the non-perforated portion ((tensile energy absorption amount (longitudinal) across the entire width of the perforated portion) / (tensile energy absorption amount (longitudinal) across the entire width of the non-perforated portion)) be 13.5 to 25.0%.

[0035] Furthermore, in the toilet roll of the embodiment, the paper is soft despite being a long roll, and in order to make it easier to tear open at the perforations, it is desirable that the ratio of the longitudinal tensile breaking elongation across the entire width of the perforated section to the longitudinal tensile breaking elongation across the entire width of the non-perforated section ((tensile breaking elongation (longitudinal) overall width of perforated section) / (tensile breaking elongation (longitudinal) overall width of non-perforated section)) be 34.5% to 55.0%.

[0036] The longitudinal tensile breaking elongation across the entire width of the perforated portion is the longitudinal tensile breaking elongation in the perforated portion. It is measured in accordance with JIS P 8113:2006 using a test piece with the entire width of the paper (i.e., the width of the toilet roll) in the longitudinal direction (MD) of the paper, with a chuck distance of 100 mm. The test piece was chucked and attached to the measuring instrument by folding it in half so that the perforations were aligned, then folding it in half again so that the perforations were aligned, and finally folding it in quarters so that the perforations were aligned, and then attaching it so that the perforations were centered between the chucks. Examples of measuring instruments include the Minebea Co., Ltd. "Universal Tension and Compression Tester TG-200N" and its equivalents. The tensile breaking elongation is the elongation at which the paper breaks in a tensile strength test and is expressed as a percentage of the initial test length (100 mm) to one decimal place. The tensile breaking elongation is measured when the paper is dry.

[0037] The longitudinal tensile breaking elongation across the entire width of the non-perforated portion is the longitudinal tensile breaking elongation in the non-perforated portion between the perforations. It is measured in accordance with JIS P 8113:2006 using a test piece with the full width of the paper, i.e., the width of a toilet roll, in the longitudinal direction (MD) of the paper, with a chuck distance of 100 mm. The test piece is chucked and attached to the measuring instrument by folding it in half along the longitudinal direction, then in half again along the longitudinal direction, and then folded in quarters before being attached. Examples of measuring instruments include the Minebea Co., Ltd. "Universal Tension and Compression Tester TG-200N" and its equivalents. This tensile breaking elongation is also the elongation at which the paper breaks in a tensile strength test and is expressed as a percentage of the initial test length (100 mm) to one decimal place. The tensile breaking elongation is a value measured when the paper is dry.

[0038] When the ratio of the longitudinal tensile breaking elongation across the entire width of the perforated section to the longitudinal tensile breaking elongation across the entire width of the non-perforated section ((tensile breaking elongation (longitudinal) overall width of perforated section) / (tensile breaking elongation (longitudinal) overall width of non-perforated section)) is 34.5% to 55.0%, when pulling the toilet paper at a position including the perforations to cut it, it will tear smoothly along the intended perforations. In particular, it is less likely to tear at an unintended perforation m2 rather than the intended perforation m1, as shown in Figures 8(A) and (D). The tensile breaking elongation is the percentage of elongation at which the paper breaks. Within this range, when pulling the toilet paper at a position including the perforations to cut it, the ratio of the tensile breaking elongation leading to breakage in the perforated and non-perforated portions is within a moderate range, making it easier for the user to apply force to the intended perforation when pulling, causing tearing to begin at the perforation and the tearing to progress continuously, making it less likely for the user to tear at unintended perforations. If this value is less than 34.5%, the longitudinal tensile breaking elongation across the entire width of the perforated portion is too small compared to the longitudinal tensile breaking elongation across the entire width of the non-perforated portion, making it easier to tear at any point along the perforations and increasing the likelihood that the paper will not be cut at the perforation intended by the user. If it is more than 55.0%, the longitudinal tensile breaking elongation across the entire width of the perforated portion is too large compared to the longitudinal tensile breaking elongation across the entire width of the non-perforated portion, making it harder to tear at any point along the perforations and increasing the likelihood that the paper will not be cut at the perforation intended by the user.

[0039] The specific longitudinal tensile breaking elongation across the entire width of the perforated portion is not necessarily limited, but is preferably 3.0 to 10.0%. The longitudinal tensile breaking elongation across the entire width of the non-perforated portion is also not necessarily limited, but is preferably 5.0 to 25.0%. Within these ranges, it is more preferable that the ratio of the longitudinal tensile breaking elongation across the entire width of the perforated portion to the longitudinal tensile breaking elongation across the entire width of the non-perforated portion ((tensile breaking elongation across the entire width of the perforated portion (longitudinal)) / (tensile breaking elongation across the entire width of the non-perforated portion (longitudinal))) be 34.5 to 55.0%.

[0040] The horizontal tensile strength of the non-perforated portion is not necessarily limited, but is preferably 400 to 600 cN. The horizontal tensile strength of the non-perforated portion is the horizontal tensile strength of the non-perforated portion between the perforations. It is measured in accordance with JIS P 8113:2006 using a test piece cut to the same width as the full longitudinal width, i.e., the same width as a toilet roll, in the horizontal direction (CD) of the paper, with a chuck distance of 100 mm. When fastening the test piece to the measuring instrument, it is folded in half horizontally, then folded again horizontally, and then folded in quarters before being attached. Examples of measuring instruments include the Minebea Co., Ltd. "Universal Tension and Compression Tester TG-200N" and its equivalents. This tensile strength also indicates the tensile strength when dry (dry tensile strength). The unit is cN. 。

[0041] If the tensile strength of the non-perforated portion in the horizontal direction is within the above range, the paper will have sufficient strength during use. In particular, since the tensile strength of paper in the horizontal direction is weaker than the tensile strength in the vertical direction, if the tensile strength of the non-perforated portion in the horizontal direction is within the above range, the paper is less likely to tear during use. Furthermore, even if a small vertical tear occurs at the end of the cut portion of the perforation, the paper is less likely to split horizontally, so the tearing does not progress. Therefore, the paper is less likely to tear vertically along the perforation.

[0042] Distance L between perforations 11 in the embodiment 6 Although not necessarily limited, the perforation interval for toilet rolls is generally 100 to 300 mm, and the effects of the present invention can be obtained within this range. In relation to the effects, the perforation interval is preferably 180 to 280 mm, and particularly preferably 200 to 260 mm. The perforation interval can be measured, for example, by pulling the roll out and using a JIS Class 1 ruler.

[0043] In the embodiment, the ratio of the length of the cut portion to the tie portion of the perforation 11 (tie / cut) is not necessarily limited, but is preferably 20.0 to 50.0%. If the tie / cut ratio is less than 20%, the paper tends to be easily torn by the winder during processing or to break unintentionally at a location other than the perforation. If the tie / cut ratio is more than 50%, the perforation tends to be difficult to cut during use or the paper tends to break at a location other than the perforation. Specifically, the preferred lengths of the cut and tie portions are 0.5 mm to 1.5 mm for the tie portion and 2.0 to 5.0 mm for the cut portion.

[0044] On the other hand, in one embodiment of the toilet roll according to the present invention, the basis weight of one ply is 11.0 to 16.5 g / m 2 The sheet is laminated in two plies, an embossed pattern is formed on the two-ply sheet, and the sheet is wound up into a toilet roll. The sheet is made of 100% pure pulp or contains 30% or less recycled pulp, and the thickness of the two plies is 140 to 220 μm.

[0045] As mentioned above, while the roll length of commercially available two-ply laminated toilet rolls made of pure pulp is generally about 25 to 35 m, one embodiment of the toilet roll according to the present invention has a roll length of 55 m or more. The toilet roll of this embodiment has a low paper thickness or basis weight in a long roll, but the problems associated with the perforations described above are improved, and the paper quality is soft, and more preferably, smooth. Furthermore, despite being a long roll and tightly wound, the roll tends to feel soft.

[0046] This is thought to be due in part to the fact that the sheet is made of 100% pure pulp or contains 30% or less recycled pulp, and secondly, that the sheet is embossed. The recycled pulp content is more preferably 20% or less, and particularly preferably 15% or less.

[0047] Regarding the first factor, the relationship between recycled paper pulp and pure pulp or a small amount of recycled paper, the following points can be mentioned.

[0048] "Recycled Paper Pulp" (edited and published by the Paper and Pulp Technology Association, Paper and Pulp Manufacturing Technology Series 4, first published August 25, 2005) Chapter 4, Papermaking Properties of Recycled Paper Pulp, 4. Summary, states the following: "When recycled through repeated wetting and drying, the fibers in chemical pulp, such as softwood kraft pulp, become keratinized as the fibers inside the pulp adhere to each other, impairing the pulp's swelling ability and reducing its water retention, and it loses flexibility and becomes rigid. This significantly reduces the interfiber bonding ability, and when made into a sheet, the density decreases and the sheet becomes bulky, with increased burst strength, stiffness, specific scattering coefficient, opacity, and air permeability. ...Curled, stiff fibers are difficult to compress in the suction box of the wire part, and water is not squeezed out, resulting in poor freeness. As the stiff fibers form the paper layer, smoothness and compressibility decrease."

[0049] Regarding the second factor, embossing increases the softness of the sheet by forming embossed recesses and embossed protrusions through embossing. Here, in this embodiment, it is particularly preferable that the embossing be double embossing. The reason is as follows.

[0050] As mentioned above, the "conventional long roll" is a two-ply embossed toilet paper containing recycled paper pulp, in which single embossing was used. The reason for the use of single embossing in the "conventional long roll" is believed to be as follows: In two-ply double embossed toilet paper, convex embossing is formed on the inner side (the side not touched by the hands) of each sheet. Therefore, when wound into a long toilet roll, the sheet is pulled more tightly than a normal-length product. As a result, in long toilet paper, where the pressure in the thickness direction of the sheet inside the toilet roll is high, tension is applied to each single embossed sheet, causing the sheets to stretch individually. As with single embossing, the convex parts interfere with each other, preventing the embossed shape from being maintained, leading to a decrease in the surface smoothness of the outer surface of the toilet roll and a blurred embossing (shape). Furthermore, because tension is applied to each single embossed sheet and the sheets are stretched individually, the perforations of each sheet are slightly misaligned, making it difficult to form a product that can be stably torn along the perforations. As such, it is believed that the double embossed product had such mechanisms and reasons, making it difficult to achieve the desired quality, and therefore a single embossed form was adopted for the "conventional long rolled product."

[0051] Toilet paper base paper containing recycled pulp becomes hard because the pulp fibers lose flexibility and become rigid, and because the rigid fibers (inflexible) form the paper layers, the smoothness is reduced and the surface of the toilet paper base paper becomes rough. Furthermore, in the case of two-ply embossed toilet paper containing recycled pulp in "conventional long roll products," single embossing is mainly used. However, with single embossing (shown by symbol E1 in Figure 1), the two-ply sheet is embossed in the same pattern as a single sheet, so the embossed shape is stronger and less likely to be crushed than with pulp products. However, as can be inferred from the schematic diagram in Figure 1, there is a clear difference between the front and back, and the embossed convex parts (shown by symbol A) protruding from the back side of the embossed part (the inner surface of the roll) have a rough surface and a coarse texture.

[0052] On the other hand, in one embodiment of the present invention, toilet rolls made from 100% pulp or toilet rolls made from close to pure pulp with a recycled paper content of 30% or less have a soft paper quality because the pulp fibers in the base paper are flexible, and the soft fibers form a soft paper layer, resulting in a soft and flexible sheet in the thickness direction of the paper.

[0053] Furthermore, toilet paper made from 100% pulp or near-pure pulp has a soft paper quality and few stiff fibers, resulting in a smooth, silky surface and excellent surface feel. Furthermore, with double embossing (designated E2) as shown in the schematic diagram of Figure 2, recesses are formed on both sides, resulting in little or no difference between the front and back of the laminated sheet. Furthermore, the fact that both sides of the laminated sheet are recessed means that users will touch the peaks between the recesses or the gently sloping portions leading to the peaks with their fingertips, and since they will be touching both sides with multiple fingers, the presence of these portions on both sides creates a soft sensation with their fingertips, and the smooth surface is strongly felt through their fingertips due to the highly flexible pulp raw material and the formation of the peaks and the gently sloping portions leading to the peaks.

[0054] As described above, in this embodiment, the problems associated with the perforations that are specific to long wound products, particularly long wound products of double embossed products, are improved. Furthermore, it has been discovered that the difficulties associated with winding described above can be resolved by devising a winding configuration for the double embossed sheet.

[0055] Mainly for the reasons mentioned above (including the creping factor), it is possible to obtain a soft and smooth toilet roll even in a long product, something that could not be expected from conventional toilet rolls made from recycled paper pulp or with a high recycled paper pulp content.

[0056] The basis weight of one ply is 11.0 to 16.5 g / m as mentioned above. 2 The preferred range is 11.5 to 16.0 g / m 2 , particularly preferably 14.5 g / m 2 More than 16.0g / m 2If the basis weight is too high, the winding length must be shortened, but if it is too low, the strength will decrease, the embossing effect will not be fully exerted, and the softness will be insufficient. Basis weight is measured as the basis weight per sheet in accordance with JIS P 8124 (2011).

[0057] As mentioned above, the paper thickness for a two-ply sheet is 140 to 220 μm. A thickness of 145 to 210 μm is desirable, with 150 to 205 μm being particularly desirable. The same applies to basis weight. A thicker sheet necessitates a shorter winding length; conversely, an excessively thin sheet results in reduced strength, a poor embossing effect, and insufficient softness. This paper thickness was measured using a PEACOCK G-type dial thickness gauge (thickness measuring device) (manufactured by Ozaki Seisakusho) under the same conditions after thoroughly conditioning a two-ply test piece under the conditions specified in JIS P 8111 (1998). Specifically, after ensuring there is no dust or dirt between the plunger and the measuring table, the plunger is lowered onto the measuring table, the dial thickness gauge's scale is moved to zero, and the plunger is then raised to place the test piece on the measuring table. The plunger is then slowly lowered at a speed of 1 mm / s or less, and the gauge reading is taken. When measuring, care should be taken to ensure that the metal plunger terminal (a circular flat surface with a diameter of 10 mm) is in contact with the paper surface perpendicularly. The measured paper thickness is the average value obtained by performing the measurement 10 times.

[0058] Furthermore, in the toilet paper according to the embodiment, with regard to the surface properties of the sheet, it is preferable that Sq (μm) of both outer surfaces of the two-ply sheet is 9.2 (μm) to 15.0 (μm).

[0059] [Sq(μm)] ISO 25178 Surface Texture (Surface Roughness Measurement) is based on an international standard that defines methods for evaluating surface roughness. Specifically, it indicates the root-mean-square height (Sq), which corresponds to the standard deviation of the distance from the mean surface. In this embodiment, the paper base weight and thickness are reduced to tissue paper-like levels, the crepe ratio is set to a range of 15-19%, and the creping doctor blade shape and release agent used to improve dryer release are adjusted to achieve a surface quality that feels soft and smooth. Sq (μm), calculated by measuring 3D image data using the VR6200 One-Shot 3D Shape Measuring Instrument and performing image analysis using the VRA2 analysis application, corresponds to the standard deviation of height. A large value indicates a sense of unevenness in the surface (the area that comes into contact with the skin) when touching the sheet. A small value indicates a sense of flatness and hardness when touching the sheet. A large Sq value indicates a sense of roughness in the convex and concave portions of the sheet, while a small Sq value indicates a sense of flatness in the area where the finger touches the sheet.

[0060] [Method for measuring Sq using the one-shot 3D shape measuring instrument VR6200] Measure the 3D image data of the sheet surface, perform surface shape correction (waviness removal, correction strength "20") using image processing, then select the reference surface setting and set the area to be measured using the arbitrary area setting. The measurement area Ar of Sq (μm) is measured by taking a 3D image within the range Ar that does not overlap the embossed depressions, in the middle of the embossed depressions E, E and the adjacent embossed depressions, as shown in Figure 5(A), and analyzing the data. In particular, in the case of an embossed pattern where the spaces between the embossed depressions are convex in a mountain or dome shape, the top of the convex part created by the embossing process is measured. In the surface roughness measurement, the image analysis area is measured over multiple circular areas with a diameter of 1 mm, and the multiple measurement surfaces are combined to form a 30 mm 2 ~40mm 2The image analysis area is measured and analyzed using a 3D image. The measurement parameter used is the "height parameter Sq (μm)." Sq (μm) is preferably 9.2 (μm) to 15.0 (μm). If Sq (μm) is less than 9.2 (μm), the surface may feel flat and not soft when touched. If Sq (μm) is more than 15.0 (μm), the surface may feel uneven and not smooth or soft. Furthermore, the ratio of Sq1 (μm) on the outer side of the sheet on the outer surface of the roll to Sq2 (μm) on the outer side of the sheet on the inner surface of the roll, Sq1 / Sq2, is preferably 0.80 to 1.25. Within this range, the difference between the front and back surfaces is small, making it difficult to sense the difference in unevenness between the front and back surfaces. Measurements are taken at 30% of the outermost edge at the start of use, and the average of 10 points is taken as the Sq value.

[0061] The depth of the embossed depressions in the present invention is not limited. It can be about the same depth as depressions formed by known embossing processes. It can also be adjusted as appropriate. Here, the embossing pattern in the embodiment is not necessarily limited. The embossing can be any appropriate embossing pattern, such as microembossing, dot-type embossing, or design embossing.

[0062] In addition, an example of a suitable embossed pattern is a pattern in which the area of ​​the recesses is 1.0 to 2.5 mm 2 and density is 5.0 to 50 pieces / cm 2 This improves the softness of toilet paper and also improves the softness of the rolled toilet paper, making it easier for consumers to feel the softness when holding it in their hands. In particular, as shown in Fig. 3, the entire paper surface is covered with a square recess 31 (Fig. 3A) whose bottom is diagonal L4 x diagonal L4 = 1.0 to 1.5 x 1.0 to 1.5 mm, or a substantially square recess 31 whose four corners extend diagonally outward. Shape Eggplant recess 32 (Figure 3B)The recesses 31 (32) are arranged in a diagonal grid pattern with a center-to-center spacing L5 of 4.5 to 5.5 mm and an angle of 45° relative to the width direction, and between the recesses 31 (32) are valley lines 33 extending from the four corners of the recesses. It is desirable that the valley lines 33 are arranged in a gradually gradual arc shape in cross section, with the corners of the recesses 31 (32) being the deepest and the middles between the recesses being the shallowest. This embossing pattern distributes tension during winding by the valley lines toward the 45° angle in the width direction, making it easy to adjust the winding firmness, and the embossing is unlikely to become unclear even when wound into a long length. Furthermore, the toilet paper itself is excellent in terms of softness and excrement wiping ability.

[0063] [Winding length elongation (%)] The winding length elongation is preferably 0.9 to 4.5%, and more preferably 1.0 to 4.3%. The winding length elongation represents the elongation of the sheet that is pulled and wound into the roll. Since toilet rolls are made of flexible, thin sheets wound in multiple layers, the "winding length elongation of the 2-ply sheet" is one of the factors that can be used to more appropriately adjust the softness of the roll.

[0064] The winding length elongation is calculated from the winding length L0 and the sheet length within the roll Ls (m) using the following formula: winding length elongation (%) = (Ls - L0) / L0... [Equation 1]. Here, winding length L0 (m) is calculated using the following method: Count the number of sheets in units of sheets separated by perforations. The winding length is calculated by counting the second through sixth sheets following the outermost wound sheet (first sheet), including the tail seal portion of the roll, as the first set. Thereafter, cut every fifth sheet with scissors or other tools and measure the sheet dimensions. The final set is taken from the innermost wound section, excluding the two sheets from the pickup section. This final set is called the nth set. To measure the sheet dimensions, place five consecutive sheets (sets) on a flat surface and measure them using a JIS Class 1 ruler. First, calculate the average set length. The average set length is calculated using the formula: average set length (m) = {length of first set + length of second set + ... + length of nth set} ÷ n... [Equation 2]. The winding length L0 is calculated as follows: L0 (m) = (average set length) × n + (average set length / 5) × {1 + (number of innermost unset sheets including the pickup section)}... (Equation 3). Note that the sheet length at the tail seal section and pickup section cannot be measured accurately due to glue adhesion or wrinkles, so it is calculated by converting it into the average sheet length (average set length / 5).

[0065] The sheet length Ls (m) in the roll represents the wound length of the sheet in the roll, and is calculated by the following procedure. (1) On the side of the roll, use a marker or similar to draw a straight line from the outermost surface of the roll to the paper core, passing through the center axis of the paper core. The mark (marker) on the outermost surface of the roll should be aligned with the outermost edge of the sheet. (2) Unwind the roll and count the number of marks made with a magic marker on the widthwise edge of the sheet, and this counts as the number of overlapping sheets in the roll, P1 (2 plies). For sheets that are not in a set, including the pickup area, calculate the number of layers, P2, by dividing (number of sheets that are not in a set x average sheet length) by [(paper tube diameter r) x π], and add these up to obtain the number of sheet layers, P. (3) Roll cross-sectional area S (cm 2 ) = π / 4 × (roll diameter R) 2 -(Paper tube diameter r) 2 ]…〔Formula 4〕, S is cm 2 Expressed in units. Roll diameter R and paper core diameter r are converted to cm. (4) Furthermore, when the thickness of the sheet in the roll is T (mm), the area of ​​the roll when the sheet is wound and stacked is the cross-sectional area of ​​the roll, so T (mm) = 1 / 2 × (Rr) / (P × 10)... (Equation 5) (5) and S(cm 2 ) = Sheet length in roll Ls (m) × T (mm) × 10... (Formula 6), T (mm) is the thickness of the sheet in the roll (6) Therefore, the sheet length in the roll Ls (m) = S (cm 2 ) / (T(mm)×10) Therefore, by substituting [Equation 4] and [Equation 5], we can obtain Ls=π / 2×(R+r)×P÷100...[Equation 6]. Thus, the winding length elongation (%) in [Equation 1] represents the elongation (%) of the sheet being pulled and wound inside the roll. The greater the elongation (%), the more the sheet is stretched inside the roll.

[0066] If the roll length elongation (%) is less than 0.9%, the sheet has high tensile rigidity and is difficult to stretch, making the paper feel hard, and the embossing must be deep and strong to prevent it from collapsing due to its tensile rigidity, resulting in a rough surface.If the roll length elongation (%) is more than 4.5%, the sheet has too low tensile rigidity and stretches easily, making the paper too soft and losing a sense of thickness and security, and the sheet is stretched because its tensile rigidity is too low, stretching the embossed irregularities and making the embossing appear collapsed, resulting in excessive loss of definition and a poor appearance.

[0067] Furthermore, the toilet paper according to the embodiment has a surface property of the sheet, and in particular, the [Spd(1 / mm 2 )] is 12.5 to 17.4 (1 / mm 2 ) is preferred.

[0068] [Spd(1 / mm 2 )] Spd(1 / mm 2) is based on the definition of surface shape in ISO25718. In this embodiment, the paper basis weight and thickness are reduced to the same level as tissue paper, the crepe rate is set to a range of 15-19%, and the shape of the creping doctor blade and the release properties from the dryer using a release agent etc. are adjusted to create a surface paper quality that feels soft and smooth. The 3D image data is measured using the one-shot 3D shape measuring instrument VR6200, and image analysis is performed using the analysis application VRA2 to obtain the Spd (1 / mm 2 ) indicates the "peak density" and 1mm 2 Number of vertices per square (1 / mm 2 The larger the diameter, the closer the peaks are to each other, making the roll feel smoother to the touch. The peaks are presumably the peaks formed by the crepe on the surface of the sheet. Furthermore, because toilet rolls are made of multiple layers of flexible, thin sheets, the surface texture of both outer surfaces of the two-ply sheet is one of the factors that affect the softness of the roll.

[0069] [Method of measuring Spd using the one-shot 3D shape measuring instrument VR6200] Measure the 3D image data of the sheet surface, and after performing surface shape correction (wave removal, correction strength "20") using image processing, select the reference surface setting and set the area to be measured using the area setting. Spd(1 / mm 2 The measurement area Ar of the surface roughness measurement is measured by taking a three-dimensional image of the area Ar between the embossed recesses E, E and the adjacent embossed recesses, not overlapping the embossed recesses, as shown in Figure 5(A), and analyzing the data. In particular, in the case of an embossed pattern in which the space between the embossed recesses is convex in a mountain or dome shape, the top of the convex part created by the embossing process is measured. In the surface roughness measurement, the image analysis area is measured over multiple circular areas with a diameter of 1 mm, and the multiple measurement surfaces are combined to form an area of ​​30 mm. 2 ~40mm 2 The image analysis area is measured and analyzed in 3D images. The measurement parameters are the morphological parameter Spd (1 / mm 2 )" is applied. 2 ) is 12.5 (1 / mm 2 If the thickness is less than 1 / mm, the surface will be rough and not pleasant to the touch.2 ) is 17.4 (1 / mm 2 If it exceeds 1 / mm, the surface will be hard and the surface properties will be poor. 2 ) and Spd2(1 / mm 2 ) ratio, Spd1 / Spd2 = 0.80 to 1.25 is desirable. Outside this range, there will be a difference in the surface texture of the sheet, resulting in a rough feel. Within these ranges, the roll tends to feel softer. This is thought to be due to the contact relationship between the surfaces of adjacent sheets wound into a roll. Measurements are taken at 30% from the outermost edge at the start of use, and the Spd value is the average of 10 points.

[0070] Furthermore, with regard to the softness of the sheet, the toilet paper according to the embodiment preferably has a softness of 0.6 to 2.1 cN / 100 mm, particularly for one ply. Because toilet rolls are made of multiple layers of flexible, thin sheets wound together, the "softness of one ply" is one of the factors for more appropriately adjusting the softness of the roll.

[0071] [Softness] This is a value measured using the handle-o-meter method in accordance with JIS L 1096 E method. However, the test piece must be 100mm x 100mm in size, with a clearance of 5mm. Measurements are taken five times in each of the longitudinal and transverse directions for one ply, and the average value of all 10 measurements is used.

[0072] Furthermore, in the toilet paper according to the embodiment, with regard to the surface properties of the sheet, it is preferable that the Spc (1 / mm) of both outer surfaces of the two-ply sheet is 4.1 (1 / mm) to 6.9 (1 / mm).

[0073] [Spc(1 / mm)] The ISO 25178 Surface Texture (Surface Roughness Measurement) is based on an international standard that defines methods for evaluating surface roughness. In this embodiment, the paper base weight and thickness are reduced to the same level as tissue paper, the crepe ratio is set to a range of 15-19%, and the creping doctor blade shape and release properties from the dryer using a release agent are adjusted to achieve a surface quality that feels soft and smooth. Three-dimensional image data is measured using the VR6200 One-Shot 3D Shape Measuring Instrument and image analysis is performed using the VRA2 analysis application. Spc (1 / mm) indicates the average principal curvature of the apex of the convex shape of the surface. A small Spc (1 / mm) value indicates a rounded point of contact with other objects, resulting in a greater resistance felt by the finger. A large Spc (1 / mm) value indicates a sharp point of contact with other objects, resulting in a lesser resistance felt by the finger. The apex of the convex shape of the surface is assumed to be the peak formed by creping or the like on the sheet surface. The top of the convex shape on the surface has a different meaning from the top of the convex portion formed by embossing.

[0074] [Method of measuring Spc using the one-shot 3D shape measuring instrument VR6200] The 3D image data of the sheet surface is measured, and after performing surface shape correction (waviness removal, correction strength "20") using image processing, the reference surface setting is selected and the area to be measured is set using the arbitrary area setting. The measurement area Ar of Spc (1 / mm) is measured by taking a 3D image within the range Ar that does not overlap the embossed depressions, in the middle of the embossed depressions E, E and the adjacent embossed depressions, as shown in Figure 5(A), and analyzing the data. In particular, in the case of an embossed pattern where the spaces between the embossed depressions are convex in a mountain or dome shape, the top of the convex part created by the embossing is measured. In the surface roughness measurement, the image analysis area is measured over multiple circular areas with a diameter of 1 mm, and the multiple measurement surfaces are combined to form an area of ​​30 mm. 2 ~40mm 2The image analysis area is measured and analyzed using 3D images. The measurement parameter used is the "morphological parameter Spc (1 / mm)." If Spc (1 / mm) is less than 4.1 (1 / mm), the surface will be less smooth and will feel uncomfortable to the touch. If Spc (1 / mm) is more than 6.9 (1 / mm), the surface will be hard and will feel less smooth to the touch. The ratio of Spc1 (1 / mm) of the outer surface of the sheet on the outer side of the roll to Spc2 (1 / mm) of the outer surface of the sheet on the inner side of the roll, Spc1 / Spc2, is preferably 0.80 to 1.25. Within this range, the difference between the front and back surfaces is small, making it difficult to feel any difference in friction between the front and back surfaces. Measurements are taken at a position 30% from the outermost edge at the start of use, and the Spc value is the average of 10 points.

[0075] Furthermore, in the toilet paper according to the embodiment, with regard to the surface properties of the sheet, it is preferable that Sdr (1 / 1000) of both outer surfaces of the two-ply sheet is 14.5 (1 / 1000) to 45.5 (1 / 1000).

[0076] [Sdr(1 / 1000)] It is based on the international standard ISO25178 Surface Quality (Surface Roughness Measurement), which defines the method for evaluating surface roughness. In other words, it expresses the degree to which the developed area (surface area) of a defined region has increased relative to the area of ​​the defined region. In this embodiment, the paper base weight and thickness are reduced to tissue paper-like levels, the crepe rate is set to a range of 15-19%, and the shape of the creping doctor blade and the release properties from the dryer using a release agent are adjusted to achieve a surface paper quality that feels soft and smooth. The Sdr (1 / 1000) is calculated by measuring 3D image data using the VR6200 One-Shot 3D Shape Measuring Instrument and performing image analysis using the VRA2 analysis application. The Sdr is the developed area ratio of the interface, expressed as "(area including unevenness) / (apparent area)-1." A large value indicates a softer feel in the thickness direction when touching the sheet. A small value indicates a harder feel when touching the sheet. valueIf the Sdr value is large, the area touched by the convex or ridged portions feels cushioned and soft to the touch, while if the Sdr value is small, there are no convex or ridged portions, and the area touched by the fingers does not feel cushioned and feels flat. The difference between the (area including the convex or ridged portions) and the (apparent area) is presumed to be caused by crepe on the surface of the sheet. Note that the convex or ridged portions on the surface are different from the convex or ridged portions caused by embossing.

[0077] [Method of measuring Sdr using the one-shot 3D shape measuring instrument VR6200] The 3D image data of the sheet surface is measured, and after performing surface shape correction (waviness removal, correction strength "20") using image processing, the reference surface setting is selected and the area to be measured is set using the arbitrary area setting. The measurement area Ar of Sdr (1 / 1000) is measured by taking a 3D image within the range Ar that does not overlap the embossed depressions, in the middle part of the embossed depressions E, E and the adjacent embossed depressions, as shown in Figure 5(A), and analyzing the data. In particular, in the case of an embossed pattern where the spaces between the embossed depressions are convex in a mountain or dome shape, the top of the convex part created by the embossing is measured. In the surface roughness measurement, the image analysis area is measured over multiple circular areas with a diameter of 1 mm, and the multiple measurement surfaces are combined to form an area of ​​30 mm. 2 ~40mm 2 The image analysis area is measured and analyzed using a 3D image. The measurement parameter used is the "composite parameter Sdr(-)." Sdr(1 / 1000) is preferably 14.5 (1 / 1000) to 21.5 (1 / 1000). If Sdr(1 / 1000) is less than 14.5 (1 / 1000), the surface will feel less soft to the touch and less pleasant to the touch. If Sdr(1 / 1000) is more than 45.5 (1 / 1000), the surface will feel too soft and unreliable. Furthermore, the ratio of Sdr1 (1 / 1000) of the outer side of the sheet on the outer surface of the roll to Sdr2 (1 / 1000) of the outer side of the sheet on the inner surface of the roll, Sdr1 / Sdr2, is preferably 0.80 to 1.25. Within this range, the difference between the front and back surfaces is small, making it difficult to feel a difference in friction between the front and back surfaces. The measurement is taken at a position 30% from the outermost edge at the start of use, and the average of 10 points is taken as the Sdr value.

[0078] The measurement items in the embodiment can be measured as follows.

[0079] [Roll width] The roll width was calculated by measuring the axial length of the outer peripheral surface of the roll at three points on the roll circumference using a JIS Class 1 metal ruler and calculating the average value. The unit is mm, and is expressed to one decimal place.

[0080] [Roll diameter] The roll diameter was measured at three locations across the width of the roll using a diameter rule (Muratec KDS Co., Ltd.) and calculated as the average value of the three locations. The unit is mm, and the value is expressed to one decimal place.

[0081] [Paper tube diameter] The diameter of the paper tube was measured at three locations across the width of the paper tube using a diameter rule (Muratec KDS Co., Ltd.) and calculated as the average value of the three locations. The unit is mm, and the value is expressed to one decimal place.

[0082] [Roll Density] Roll density is calculated by dividing the roll weight (g) excluding the paper core by the roll volume (cm 3 The unit is g / cm 3 , expressed to three decimal places. Roll density (g / cm 3 ) = (Roll length (m) × Basis weight (g / m 2 ) × number of plies × roll width (cm) / 100) ÷ (roll cross-sectional area (cm 2 ) x roll width (cm).

[0083] The pulp fibers in toilet paper are not particularly limited, but preferably contain 70-100% virgin pulp by mass and 0-30% recycled paper pulp by mass. Blending recycled paper pulp allows for more cost-effective production than 100% virgin pulp by mass. Furthermore, recycled paper pulp tends to be finer during the process of recycling pulp from waste paper than the pulp fibers before recycling. Due to this fiber nature, the fibers become denser without increasing the paper thickness, but the finer fibers make it difficult to achieve paper strength. Excessive blending reduces texture, such as flexibility and smoothness. Therefore, taking into account the characteristics of recycled paper pulp, its blending ratio can be set within the range of 0-30% by mass. While the type of recycled paper pulp is not necessarily limited, recycled paper pulp made from milk carton paper or high-quality recycled paper is particularly desirable. These pulps are easily able to achieve paper strength because they contain a large amount of softwood kraft pulp (NBKP) or hardwood kraft pulp (LBKP) derived from the raw materials.

[0084] On the other hand, it is particularly desirable to use 100% virgin pulp, and it is particularly desirable for the virgin pulp to be softwood kraft pulp (NBKP) and hardwood kraft pulp (LBKP).The blend ratio of these pulps is preferably 20:80 to 50:50.

[0085] The effects of the toilet roll according to the present invention will be further explained below with reference to examples, comparative examples, and commercially available examples of toilet rolls. [Example]

[0086] The toilet paper in each example was taken from a toilet roll. Double embossing is a form with recesses on both sides, as shown in Figure 2. In the figure, the recesses E2 on the front and back face each other, but this does not necessarily mean that the recesses E2 on the front and back face each other. The physical properties and composition of each example are as shown in Table 1. However, since Commercial Product 1 and Commercial Product 3 are single embossed, when measuring Spc, Spd, Sdr, and Sq for Commercial Product 1 and Commercial Product 3, the measurement area Ar on the surface where the embossed convexities are formed was set to the top area of ​​the embossed convexities E', as shown in Figure 5(B). This is because, in single embossing, the surface on which the embossed convexities are formed is the area that is most likely to come into contact with the hand, especially the tops of the convexities.

[0087] A sensory evaluation test was conducted on the toilet rolls and sheets of the Examples, Comparative Examples, and Commercial Examples. The test was conducted by 17 people. Subjects The evaluation was conducted by excluding the highest and lowest scores from the 15 people and the average score was used as the evaluation score.

[0088] The sensory evaluation test for the rolls and sheets involved subjects actually placing each example of toilet roll in a holder and using it for one week, and checking the following points regarding cutting along the perforations: "Does the perforation break unintentionally?", "Does it break when the hand or fingertips are used to cut the perforations?", "Does the perforation tear vertically along the perforations when cutting the perforations?", "How soft is the sheet to the touch?", "How smooth is the sheet to the touch?" Yo "Sheet thickness", "Difference between front and back of sheet", "Sheet thickness Direction Relative evaluations were made with Commercial Example 1 (long roll) as the standard for each of the following items: cushioning, sheet tear resistance, roll embossing clarity, and roll softness. The evaluations were scored as follows: 4 points for something similar to Commercial Example 1, 5 points for something slightly better than Commercial Example 1, 6 points for something better than Commercial Example 1, 7 points for something much better than Commercial Example 1, 3 points for something slightly worse than Commercial Example 1, 2 points for something worse than Commercial Example 1, and 1 point for something much worse than Commercial Example 1, and the average of these scores was calculated to make the judgment.

[0089] [Table 1]

[0090] The shape and density of the embossing are substantially the same for Examples 1 to 7 and Comparative Examples 1 and 2. The perforations in Examples 1 and 2 were set at 1.0 mm:2.0 mm for tie:cut. Examples 3 to 7 were set at 1.22 mm:2.58 mm. For commercially available products, Commercial Product 2 was 1.00 mm:0.985 mm.

[0091] According to the results in Table 1, Examples 1 to 7 were highly rated in comparison with the same long product, Commercially Available Product 1, and the Comparative Example, in the items related to cutting at the perforations, such as "whether there is unintentional tearing at the perforations," "whether there is tearing at the hand or fingertips when cutting at the perforations," and "whether there is vertical tearing in the middle of the perforations when cutting at the perforations." In addition, "softness of the sheet to the touch," "smoothness of the sheet to the touch," and "thickness of the sheet" were also highly rated. Direction In addition to the evaluation of the sheet itself, such as "cushioning," it was also found to be remarkably excellent in the evaluation of the roll form, such as "softness of the roll."

[0092] Looking more closely, the sheets and rolls of Examples 1 to 7 were rated higher than those of Commercial Product 1 and Comparative Example 2, which are both long products, and were rated equal to or higher than those of Commercial Product 2 and Commercial Product 3, which are relatively short in length. In other words, both the sheets and rolls felt soft. Examples 1 to 7 were rated highly for the softness of the sheets and rolls, despite being long rolls. This is thought to be because, with double embossing, each ply is embossed, so that when compressed, the force is dispersed within the roll, and the difference in surface properties between the front and back of the sheet is small. This, combined with the surface properties of the sheet itself, makes the rolls feel softer than single embossed long rolls.

[0093] Furthermore, compared to the same long-length Commercial Product 3 and Comparative Example 2, Examples 1 to 7 have a low softness of 0.9 to 2.0 cN / 100 mm. Furthermore, the winding length elongation (%) is high at 1.7 to 4.2%, indicating that the sheets are soft and easily stretched by tension, and the softness of the sheets of the Examples is highly rated. Furthermore, they are rated higher than Commercial Products 2 and 3, which have relatively short winding lengths. This is thought to be related to the reduced basis weight achieved by increasing the length. Furthermore, the fluffiness of the sheet is rated higher than that of Commercial Product 3, which is a short-length wound product. This is thought to be due to the double embossing.

[0094] Furthermore, in Examples 1 to 7, the MMD was 5.8 to 6.8, which was low compared to the same long product, Commercially Available Product 1, and the Comparative Example, and the smoothness of the sheets of the Examples was evaluated. [Industrial Applicability]

[0095] The toilet roll of the present invention can be used not only for home use but also for commercial use (for example, in airport toilets used by an unspecified number of people, hospitals, etc.). [Explanation of symbols]

[0096] 1...toilet roll, 10...toilet paper, 20...paper tube (core), L2...toilet roll roll diameter, L3...toilet roll core diameter, L1...toilet roll roll width, E, E1, E2...embossed recesses, M...ridges.

Claims

1. The basis weight of one ply is 11.0 to 16.5 g / m ２ A toilet roll in which the sheet of the above is laminated in two plies, an embossment is formed on the two-ply sheet, and the toilet roll is wound up, The paper thickness of the two-ply paper is 140 to 220 μm, the roll length is 55 m or more, and the roll diameter is 110 to 130 mm, The sheet is made of 100% pure pulp or a sheet containing 30% or less recycled pulp, having perforations, The longitudinal tensile strength across the entire width of the non-perforated portion is 1300 to 1800 cN, and the longitudinal tensile strength across the entire width of the perforated portion is 580 to 780 cN, and The tensile modulus in the longitudinal direction across the entire width of the perforation is 5.0 to 33.0 MPa; The ratio of the longitudinal tensile modulus of the entire width of the perforated portion to the longitudinal tensile modulus of the entire width of the non-perforated portion ((perforated portion tensile modulus (longitudinal) entire width) / (non-perforated portion tensile modulus (longitudinal) entire width)) is 70.0 to 100.0%. A toilet roll characterized by:

2. A toilet roll as described in claim 1, wherein the longitudinal tensile modulus across the entire width of the non-perforated portion is 5.5 to 36.0 MPa.

3. A toilet roll as described in claim 2, wherein the lateral tensile strength of the non-perforated portion is 400 to 600 cN.

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