Roller toilet paper

Abstract

To provide a toilet paper roll which is long in winding length but is soft and easy to cut at a hole. The toilet paper roll of the present invention is formed by winding two layers of a sheet material having a basis weight of 11.0-16.5 g / m 2 2, the sheet material being embossed and having a thickness of 140-220 μm, a winding length of 55 m or more, a roll diameter of 110-130 mm, and a sheet material made of 100% pure pulp or a sheet material containing 30% or less of waste paper pulp, the sheet material having a hole, a tensile strength in the longitudinal direction of the full width of the non-hole portion being 1300-1800 cN, a tensile strength in the longitudinal direction of the full width of the hole portion being 580-780 cN, an elastic modulus in the longitudinal direction of the full width of the hole portion being 5.0-33.0 MPa, and a ratio of the elastic modulus in the longitudinal direction of the full width of the hole portion to the elastic modulus in the longitudinal direction of the full width of the non-hole portion being 70.0-100.0%.

Description

Technical Field

[0001] This invention relates to a roll of toilet paper. Background Technology

[0002] The standard roll length of toilet paper, especially in two-ply products such as double-ply, is typically 25-30 meters. In recent years, a segment of toilet paper consumers has preferred so-called long-size toilet paper rolls, with a roll length of 50-60 meters (twice that of the standard roll) and 75-90 meters (three times that of the standard roll).

[0003] This is mainly due to its advantages such as ease of carrying and transporting after purchase, fewer purchases and exchanges, and convenience in terms of storage space. Moreover, the longer size of toilet paper rolls has the benefits of saving resources and also allows retailers to compact their store display space.

[0004] For example, in Patent Document 1, according to its embodiment, it is a rolled product with a single embossing of two layers, the basis weight of one layer being 13.5 to 16.5 g / m². 2 And long-size coils with a winding length of 74 to 91 m (hereinafter also referred to as "previously long-size coils").

[0005] In long-size rolls containing this “previously long-size roll”, embossing is applied to ensure softness. In particular, in the “previously long-size roll”, which has a roll length that is three times that of the usual roll (hereinafter also referred to as “short-size roll”), waste paper pulp is contained and single embossing is applied.

[0006] [Previous Technical Documents]

[0007] (Patent Documents)

[0008] Patent Document 1: Japanese Patent No. 6726653 Summary of the Invention

[0009] However, in previous long-length rolled products, especially as the roll length increased, the roll was often too stiff when held, giving consumers the impression that the rolled sheet was also stiff.

[0010] Furthermore, the softness of the sheets in previous long-size rolls was not always sufficient, especially for consumers who expect softness when using short-size rolls in their daily lives, so there is still room for improvement.

[0011] Furthermore, in long-size rolled products that include "previously long-size rolled products", such as Figure 6As shown, when a user pulls out toilet paper 110 from the toilet paper roll 101 installed in the toilet paper holder and performs the cutting operation at the eyelet m1, there will be... Figure 6 (A) Figure 6 The continuous cracking of the eyelet m1 shown in (B) did not proceed smoothly, and instead, a crack T1 occurred in the longitudinal direction (continuous direction of the toilet paper) towards the front end of the toilet paper 110 during the process of the eyelet m1.

[0012] Therefore, the main problem to be solved by the present invention is to provide a roll of toilet paper that, although it is a long roll, gives the roll a soft feel and exhibits sufficient softness and smoothness in the sheet, and can be easily broken at the eyelets, especially not easily tearing in the longitudinal direction along the eyelets.

[0013] The toilet paper rolls that have solved the above problems have the following characteristics.

[0014] A type of toilet paper roll has a single layer with a basis weight of 11.0–16.5 g / m³. 2 The sheet is laminated in two layers, and embossing is formed on the two layers of sheet, which are then rolled up to form a roll of toilet paper;

[0015] Its features include a 2-layer paper thickness of 140–220 μm, a winding length of 55 m or more, and a roll diameter of 110–130 mm;

[0016] The sheet material is made of 100% pure pulp or waste paper pulp with a content of less than 30%;

[0017] The part with holes has a tensile strength of 1300–1800 cN in the longitudinal direction across its entire width, while the part with holes has a tensile strength of 580–780 cN in the longitudinal direction across its entire width.

[0018] The elastic modulus of the eyelet in the longitudinal direction across its full width is 5.0–33.0 MPa, and

[0019] The ratio of the elastic modulus of the perforated portion in the longitudinal direction of the whole width to that of the non-perforated portion in the longitudinal direction of the whole width ((elastic modulus of the perforated portion (longitudinal) of the whole width) / (elastic modulus of the non-perforated portion (longitudinal) of the whole width)) is 70.0 to 100.0%.

[0020] (The effect of the invention)

[0021] According to the present invention, a roll of toilet paper is provided that, although it is a long roll, gives the roll a soft feel and exhibits sufficient softness and smoothness in the sheet, and can be easily broken at the eyelets, especially not easily tearing in the longitudinal direction along the eyelets. Attached Figure Description

[0022] Figure 1This is a partial cross-sectional view based on a single embossed item.

[0023] Figure 2 This is an example of a partial cross-sectional view of a double-embossed article according to an embodiment.

[0024] Figure 3 (A) is an explanatory diagram of the embossing shape and configuration; Figure 3 (B) is an explanatory diagram of the embossing shape and configuration.

[0025] Figure 4 This is a diagram illustrating the basic structure of toilet paper rolls.

[0026] Figure 5 (A) and (B) are schematic diagrams illustrating the areas where the surface properties of the sheet were measured.

[0027] Figure 6 (A) and (B) are diagrams used to illustrate the longitudinal cracking in the eyelet.

[0028] Figure 7 (A) and (B) are diagrams used to illustrate the accidental breakage that occurs when the eyelet is disconnected during operation.

[0029] Figure 8 (A) and (B) are diagrams used to illustrate the accidental cracking of the eyelet during an eyelet disconnection operation.

[0030] Label Explanation

[0031] 1,101: Toilet paper rolls;

[0032] 10,110: Toilet paper;

[0033] 11: Hole;

[0034] 20: Paper tube (core tube);

[0035] L1: Width of the toilet paper roll;

[0036] L2: Diameter of the toilet paper roll;

[0037] L3: Diameter of the paper tube in a toilet paper roll;

[0038] L4: Diagonal length;

[0039] L5: Central septum;

[0040] L6: Spacing between holes;

[0041] 31,32: concave part;

[0042] 33: Valley line section;

[0043] E: embossed concave part;

[0044] E': convex part;

[0045] E1: Single embossing;

[0046] E2: Double embossing (recessed area);

[0047] A: Embossed convex part;

[0048] Ar: Measurement area (range);

[0049] M: Peak;

[0050] m1, m2: eyelets;

[0051] T1: Cracked;

[0052] T2: Fracture;

[0053] Z1: Near the pinched part. Detailed Implementation

[0054] Next, embodiments of the present invention will be described with reference to the accompanying drawings. Figure 4 As shown, the toilet paper roll 1 is made by winding two layers of strip toilet paper 10 onto a paper tube (also called a core tube) 20 to form a roll. The toilet paper roll has perforations 11 at predetermined intervals. The width L1 of the roll is not necessarily limited, but is preferably 100–120 mm; the diameter L3 of the paper tube is also not necessarily limited, but is preferably 35–42 mm.

[0055] Regarding one sample of the toilet paper roll of the present invention, the roll length is 55m or more, and the roll diameter L2 is 110 to 130mm. The upper limit of the roll length is 105m, the desired range is 50 to 90m, and particularly desired is 50 to 85m. Moreover, considering the product group, it is desirable to set it to 55 to 65m at twice the roll length and 70 to 82m at three times the roll length. For the typical roll length of 2-ply ordinary toilet paper rolls (short roll products) sold as pure pulp products is around 25 to 30m, the long size of the roll length of 55m or more of the toilet paper roll sample of the present invention makes it easy to carry and transport after purchase, and also provides convenience in terms of storage space.

[0056] The drum diameter is set to 110–130 mm from the viewpoint of the effectiveness of this invention and in relation to the general size of drum retainers in Japan. If it exceeds 130 mm, the installability of the retainer will deteriorate. Furthermore, there are limitations from the viewpoint of ease of unwinding. The drum diameter is ideally 110–125 mm, and is particularly desirable at 110–120 mm due to its relation to the size of drum retainers in JIS standards.

[0057] Toilet paper rolls 1, whether long or short rolls, are typically designed with a roll diameter suitable for use in toilet paper holders. Therefore, due to this roll diameter, long rolls tend to have a lower paper thickness and basis weight compared to short rolls, resulting in a stiffer roll and a larger mass. Furthermore, when wound by a winding machine during manufacturing, higher tension is used compared to short rolls. Therefore, in long rolls, to prevent paper breakage at the perforations during manufacturing, there is a tendency to set the strength of the perforated portion of the base paper before winding to be stronger than in short rolls.

[0058] On the one hand, since the perforations during winding are stretched along the long side of the sheet, it is speculated that under the high tension of long-length wound products, the shape of the cut portion, which is prone to cracking at the cut, and the shape of the connecting portion therein, are likely to deviate. Furthermore, since the sheet is composed of fibers, the fiber orientation near the connecting portion must be deviated.

[0059] Furthermore, the longer rolls are wound stiffer, so it's speculated that when pulled from the roll, the toilet paper will be much looser compared to the shorter rolls. Also, the longer rolls are heavier than the shorter ones, so the roll is less likely to start rotating when the user pulls it from the toilet paper holder.

[0060] For short-sized rolled products, the tension during winding does not need to be high and the mass is also smaller, so the strength of the eyelets can be set to be low. This makes it easy to design the eyelets to crack easily and not to break accidentally. However, in long-sized rolled products, the characteristics of applying force to the eyelets during manufacturing, in roll form, and during use are very different from those of short-sized rolled products. Therefore, it is speculated that this is the main reason for the problem of eyelet cracking that is unique to long-sized rolled products.

[0061] In this embodiment, regarding the issue of the paper exhibiting sufficient softness despite being a long-length roll, and specifically addressing the problem of tearing at the eyelets, this toilet paper is designed to be easy to tear at the eyelets rather than tearing longitudinally along the way. The toilet paper has a tensile strength of 1300–1800 cN in the longitudinal direction across its non-eyelet portion, a tensile strength of 580–780 cN in the longitudinal direction across its eyelets, a modulus of elasticity of 5.0–33.0 MPa in the longitudinal direction across its eyelets, and a ratio of the modulus of elasticity of the eyelets to that of the non-eyelet portion ((modulus of elasticity of eyelets (longitudinal) across width) / (modulus of elasticity of non-eyelets (longitudinal) across width)) of 70.0–100.0%.

[0062] Here, the "full width" in this invention and specification refers to the same width as the roll width. From the perspective of the effectiveness of this invention and its relationship to general product widths, the roll width of the toilet paper rolls according to this invention is set to 105-120 mm. Therefore, the "full width" of this invention refers to the full width within this range.

[0063] The tensile strength in the longitudinal direction of the non-perforated portion is the tensile strength in the longitudinal direction of the entire width of the portion between perforations that does not form perforations. It is measured according to JIS P 8113:2006, using a test piece with the width of the paper as the full width (i.e., the width of a roll of toilet paper), with the distance between the clamps set to 100 mm in the longitudinal direction (MD direction). Furthermore, when the test piece is clamped and installed in the measuring device, it is folded in half along the longitudinal direction, then folded in half again along the longitudinal direction, resulting in a quarter fold before installation. Examples of measuring devices include the "Universal Tensile Compressor TG-200N" manufactured by Minebea and equivalent models. Additionally, tensile strength refers to the tensile strength when dry (dry tensile strength). The unit is expressed as cN.

[0064] The tensile strength of the perforated portion in the longitudinal direction across its entire width is measured according to JIS P 8113:2006. It is measured using a test piece with the width of the paper as the entire width (i.e., the width of a roll of toilet paper), with the distance between the clamps set to 100 mm in the longitudinal direction (MD direction) of the paper. Furthermore, when the test piece is clamped and mounted in the measuring device, it is folded in half to align the perforations, then folded in half again to align the perforations, and finally folded into a quarter fold to align the perforations, and mounted with the perforations centered between the clamps. Examples of measuring devices include the "Universal Tensile Compressor TG-200N" manufactured by Minebea and equivalent models. This tensile strength also refers to the tensile strength under dry conditions (dry tensile strength). The unit is expressed as cN.

[0065] If the tensile strength of the non-perforated portion in the longitudinal direction across the entire width is 1300–1800 cN, and the tensile strength of the perforated portion in the longitudinal direction across the entire width is 580–780 cN, then it possesses sufficient strength during use. Ideally, the tensile strength of the non-perforated portion in the longitudinal direction across the entire width should be 1400–1750 cN, and the tensile strength of the perforated portion in the longitudinal direction across the entire width should be 590–700 cN. In toilet paper rolls, the continuous direction (long side direction) of the toilet paper is the longitudinal direction. Therefore, the tensile strength in the longitudinal direction is the tensile strength in the direction in which the perforations are torn. If the tensile strength in the longitudinal direction of both the perforated and non-perforated portions is within the above range, then it can be manufactured without paper breakage during production, and it is also easy to produce a toilet paper roll that tears smoothly at the perforations.

[0066] The ratio of the tensile strength of the perforated portion in the longitudinal direction to that of the non-perforated portion in the longitudinal direction ((tensile strength of the perforated portion (longitudinal) total width) / (tensile strength of the non-perforated portion (longitudinal) total width)) is not necessarily limited, but an excessively large difference is not desirable, and is preferably 36.0% to 47.0%. Particularly preferred is 38.0% to 45.0%. For a winding length of 55 to 65 m, a value of 38% to 43% is also desirable.

[0067] The modulus of elasticity of the perforated portion in the longitudinal direction over its entire width is the modulus of elasticity in the longitudinal direction of the portion with perforations. It is measured using a test piece with the width of the paper as its entire width (i.e., the width of a roll of toilet paper) as the standard, with the distance between the clamps set to 100 mm in the longitudinal direction (MD direction) of the paper. Furthermore, when the test piece is clamped and installed in the measuring device, it is folded in half to align the perforations, then folded in half again to align the perforations, and finally folded into a quarter fold to align the perforations, and installed with the perforations centered between the clamps. Examples of measuring devices include the "Universal Tensile Compressor TG-200N" manufactured by Minebea Corporation and similar models. The modulus of elasticity is the value when dry. The modulus of elasticity is derived from the ratio of elongation per unit length to tensile load per unit area (section area) based on continuously recorded data. It is calculated from the maximum slope of the elongation-load curve and is Young's modulus using the following formula (A): Modulus of elasticity = (Elongation (mm) / Distance between clamps (mm)) × (Maximum slope of load-elongation curve (N / mm)) / (Width of test piece (mm) × Thickness of test piece (mm))...(A). The unit of modulus of elasticity is MPa. Furthermore, the thickness of the test piece here refers to the paper thickness measured at 100 kPa according to JIS P 8118.

[0068] The modulus of elasticity of the non-perforated portion in the longitudinal direction across the entire width is the modulus of elasticity in the longitudinal direction of the portion between perforations where no perforations are formed. It is measured using a test piece with the width of the paper as the full width (i.e., the width of a roll of toilet paper) in the longitudinal direction (MD direction) of the paper, with the distance between the clamps set to 100 mm. Furthermore, when the test piece is clamped and installed in the measuring device, it is folded in half along the longitudinal direction, then folded in half again along the longitudinal direction, resulting in a four-fold fold before installation. Examples of measuring devices include the "Universal Tensile Compressor TG-200N" manufactured by Minebea and equivalent models. This modulus of elasticity is also the value under dry conditions. The modulus of elasticity of the non-perforated portion in the longitudinal direction across the entire width, like that of the perforated portion, is calculated from continuously recorded tensile strength (tensile load) and elongation, using the Young's modulus calculated by the above formula (A).

[0069] If the ratio of the elastic modulus of the perforated portion in the longitudinal direction to that of the non-perforated portion in the longitudinal direction ((elastic modulus of the perforated portion (longitudinal) of full width) / (elastic modulus of the non-perforated portion (longitudinal) of full width)) is 70.0% to 100.0%, then when the toilet paper is cut and a stretching operation is performed at the perforated portion, it will tear smoothly at the perforation, and in particular, it is less likely to produce... Figure 6 (A) and Figure 6(B) shows the phenomenon T1, where the tissue paper splits longitudinally along the perforation m1. The ratio of the elastic modulus of the perforated portion in the longitudinal direction across the full width to that of the non-perforated portion in the longitudinal direction ((elastic modulus of the perforated portion (longitudinal) full width) / (elastic modulus of the non-perforated portion (longitudinal) full width)) is preferably 80-98%, with a particularly desirable value of 86-97%. This ratio of the elastic modulus of the perforated portion in the longitudinal direction across the full width to that of the non-perforated portion is a ratio of the ease of stretching to elongation between the perforated and non-perforated portions. If it falls within the above range, when the tissue paper is to be cut and a stretching operation is performed at the location containing the perforation, the non-perforated portion deforms appropriately relative to the perforated portion. Specifically, at the perforation, the deformation causes the perforation to open. Furthermore, with other configurations of the present invention, if within the aforementioned range, after appropriate deformation of each part, the eyelet begins to crack and the cracking progresses continuously, and it is expected that the eyelet will crack smoothly, especially making it difficult to crack longitudinally along the path of the eyelet. If this value is less than 70.0%, the possibility of paper breakage in the winding machine and accidental eyelet breakage during processing increases. Moreover, the eyelet is excessively deformed until it breaks. That is, the elongation of the connecting part of the eyelet to the cut portion is too large, causing the connecting part to bear the load and not crack, making it difficult to crack smoothly in the eyelet, especially making it easy for a certain connecting part to become the starting point of longitudinal cracking. If it exceeds 100.0%, even if force is intentionally applied during use, it is not easy to crack the eyelet, and after the cracking begins, the cracking progresses rapidly and too quickly, and cracking occurs in parts other than the eyelet, especially failing to sufficiently improve the phenomenon of cracking longitudinally along the path of the eyelet.

[0070] Specifically, the elastic modulus of the eyelet in the longitudinal direction across its full width is 5.0–33.0 MPa. For winding lengths of 55–65 m, a modulus of 5.0–15.0 MPa is also desirable. If it exceeds 33.0 MPa, the eyelet will not easily elongate. Furthermore, adjusting the length of the eyelet connection to be smaller will lead to deviations in eyelet strength, which is undesirable. If it is less than 5.0 MPa, the eyelet will easily elongate, leading to excessive cracking of the eyelet, which is also undesirable.

[0071] The specific elastic modulus of the non-perforated portion in the longitudinal direction across the full width is not limited, but in relation to the preferred elastic modulus of the perforated portion in the longitudinal direction across the full width described above, it is preferably 5.5 to 36.0 MPa. When the winding length is 55 to 65 m, it is also desirable to have 6.0 to 15.5 MPa.

[0072] In the toilet paper rolls of the embodiment, in order to achieve a soft texture and easier breakage at the perforations despite being a long roll, it is desirable to set the ratio of the tensile energy absorption in the longitudinal direction of the perforated portion to the tensile energy absorption in the longitudinal direction of the non-perforated portion ((tensile energy absorption in the perforated portion (longitudinal) total width) / (tensile energy absorption in the non-perforated portion (longitudinal) total width)) to 13.5% to 25.0%. More preferably, it is desirable to set it to 13.5% to 22.0%. When the roll length is 55 to 65 m, it is also desirable to set it to 13.8% to 16.0%.

[0073] The tensile energy absorption in the longitudinal direction of the perforated portion is the tensile energy absorption in the longitudinal direction of the portion with perforations. It is measured using a test piece with the width of the paper as the full width (i.e., the width of a roll of toilet paper) as the standard (JIS P 8113:2006), with the distance between the clamps set to 100 mm in the longitudinal direction (MD direction) of the paper. Furthermore, when clamping and mounting the test piece in the measuring device, it is folded in half to align the perforations, then folded in half again to align the perforations, and finally folded into a quarter fold to align the perforations, and mounted with the perforations centered between the clamps. Examples of measuring devices include the "Universal Tensile Compressor TG-200N" and equivalent models manufactured by Minebea. The tensile energy absorption is the value under drying conditions. Tensile energy absorption is the energy consumption per unit area (J / m²) required to achieve tensile fracture. 2 The tensile energy absorption is calculated from the area of ​​the continuously recorded elongation versus load curve up to the maximum tension, and is also the integral of the elongation versus load curve up to the point of fracture of the test piece. Therefore, by continuously measuring the tensile load and elongation during the tensile test until fracture, the area can be calculated from the curve obtained by plotting the measured values.

[0074] The tensile energy absorption in the longitudinal direction of the non-perforated portion is the tensile energy absorption in the longitudinal direction of the portion without perforations between perforations. It is measured using a test piece with the width of the paper as the full width (i.e., the width of a roll of toilet paper) as the standard (JIS P 8113:2006), with the distance between the clamps set to 100 mm in the longitudinal direction (MD direction). Furthermore, when the test piece is clamped and installed in the measuring device, it is folded in half along the longitudinal direction, then folded in half again along the longitudinal direction, resulting in a four-fold fold before installation. Examples of measuring devices include the "Universal Tensile Compressor TG-200N" manufactured by Minebea and equivalent models. This tensile energy absorption is a value under dry conditions. The calculation of the tensile energy absorption is the same as for the perforated portion described above.

[0075] If the ratio of the tensile energy absorbed by the perforated area in the longitudinal direction of the whole width to the tensile energy absorbed by the non-perforated area in the longitudinal direction of the whole width ((tensile energy absorbed by the perforated area (longitudinal) of the whole width) / (tensile energy absorbed by the non-perforated area (longitudinal) of the whole width)) is 13.5% to 25.0%, then when the toilet paper is to be cut and a stretching operation is performed at the part containing the perforation, it will tear smoothly at the perforation, and in particular, it is less likely to produce... Figure 7 (A) and Figure 7 As shown in (B), when cutting through the hole m1, the breakage T2 occurs at the part held by the user and its vicinity Z1. The tensile energy absorption is the power consumption per unit area required to achieve tensile breakage. If it falls within the above range, then when cutting toilet paper and performing a tensile operation at the location containing the hole, the ratio of power consumption for breaking through the hole to that of the non-hole portion is within an appropriate range. This makes it easier to reliably apply tensile force to the part held by the user and its vicinity until the hole, allowing the breakage to progress continuously and smoothly at the hole, while minimizing the likelihood of problems such as... Figure 7 The diagram illustrates fractures occurring in and around the area held by the user, particularly fractures originating from the eyelet. When this value is less than 13.5%, the tensile energy absorption of the eyelet in the longitudinal direction across the entire width is too small compared to the non-eyelet area, making it prone to accidental breakage at the eyelet. When it exceeds 25.0%, the tensile energy absorption of the eyelet in the longitudinal direction across the entire width is too large compared to the non-eyelet area. When the user intends to cut through the eyelet, the high tensile energy absorption outside the eyelet makes it less likely to break, thus preventing breakage at the eyelet. The increased force applied by the user's fingertips makes the area held by the user prone to breakage, especially in cases where accidental breakage occurs in or around the area held by the user.

[0076] The specific tensile energy absorption of the aperture in the longitudinal direction across its entire width is not necessarily limited; preferably, this tensile energy absorption is 1.0–12.5 J / m. 2 The optimal value is 1.0–8.5 J / m³. 2 For winding lengths of 55–65 m, a flux of 1.0–5.0 J / m is also desirable. 2 The tensile energy absorption of the non-porous eyelet in the longitudinal direction across its entire width is not necessarily limited, but preferably 9.0–60.0 J / m. 2 Within these ranges, the ratio of the tensile energy absorption of the perforated portion in the longitudinal direction of the full width to the tensile energy absorption of the non-perforated portion in the longitudinal direction of the full width ((tensile energy absorption of the perforated portion (longitudinal) full width) / (tensile energy absorption of the non-perforated portion (longitudinal) full width)) is preferably set to 13.5 to 25.0%.

[0077] Furthermore, in the toilet paper roll of the embodiment, in order to make the paper soft and easier to break at the perforations even though it is a long roll, it is desirable to set the ratio of the elongation at break in the longitudinal direction of the perforated portion to the elongation at break in the longitudinal direction of the non-perforated portion ((elongation at break of perforated portion (longitudinal) of full width) / (elongation at break of non-perforated portion (longitudinal) of full width)) to 34.5% to 55.0%.

[0078] The elongation at break in the longitudinal direction of the perforated portion is the elongation at break in the longitudinal direction of the perforated portion. It is measured using a test piece with the width of the paper as the full width (i.e., the width of a roll of toilet paper) as the standard, with the distance between the clamps set to 100 mm in the longitudinal direction (MD direction) of the paper. Furthermore, when the test piece is clamped and installed in the measuring device, it is folded in half to align the perforations, then folded in half again to align the perforations, and finally folded into a quarter fold to align the perforations, and installed with the perforations centered between the clamps. Examples of measuring devices include the "Universal Tensile Compressor TG-200N" manufactured by Minebea and similar models. Elongation at break is the elongation at break of the paper when it breaks due to a tensile strength test; it is a percentage of the initial test length (100 mm) and expressed to one decimal place. In addition, the elongation at break is the value when dry.

[0079] The elongation at break in the longitudinal direction of the non-perforated portion, and the elongation at break in the longitudinal direction of the portion between perforations where no perforations are formed, are measured according to JIS P 8113:2006, using a test piece with the width of the paper as the full width, i.e., the width of a roll of toilet paper, in the longitudinal direction (MD direction) of the paper, with the distance between the clamps set to 100 mm. Furthermore, when the test piece is clamped and installed in the measuring device, it is folded in half along the longitudinal direction, then folded in half again along the longitudinal direction, resulting in a four-fold fold before installation. Examples of measuring devices include the "Universal Tensile Compressor TG-200N" manufactured by Minebea and equivalent models. This elongation at break, also measured by tensile strength testing, is the elongation at break when the paper breaks, expressed as a percentage of the initial test length (100 mm) to one decimal place. Additionally, the elongation at break is a value at the point of drying.

[0080] If the ratio of the elongation at break in the longitudinal direction of the perforated area to that in the longitudinal direction of the non-perforated area ((elongation at break of perforated area (longitudinal) / (elongation at break of non-perforated area (longitudinal) / full width)) is 34.5% to 55.0%, then when the toilet paper is to be cut and a stretching operation is performed at the location containing the perforated area, it will tear smoothly at the desired perforation. In particular, it is less prone to producing... Figure 8 (A) and Figure 8 (B) illustrates the phenomenon where, when intentionally cut at eyelet m1, the paper is accidentally cut at eyelet m2. Elongation at break is the elongation at which the paper breaks. If it falls within the above range, then when stretching the toilet paper at the eyelet location, the ratio of the elongation at break between the eyelet portion and the non-eyelet portion to the point of breakage is within an appropriate range. This suggests that when the user stretches the paper, it is easier to apply force to the desired eyelet, causing it to begin cracking and the cracking to continue, while unintentionally cracking eyelets is less likely to occur. If this value is less than 34.5%, then the elongation at break in the longitudinal direction of the eyelet portion is too small compared to the elongation at break in the longitudinal direction of the non-eyelet portion, making it easy to cut at any point in either eyelet, thus increasing the likelihood that the desired eyelet will not be cut. When the percentage exceeds 55.0%, the elongation at break in the longitudinal direction of the hole is too large compared to the elongation at break in the longitudinal direction of the non-hole, making it difficult to cut at any point in any hole, thus increasing the possibility of not being able to cut the hole in the user's preferred position.

[0081] The specific elongation at break in the longitudinal direction of the perforated portion is not necessarily limited, but is preferably 3.0% to 10.0%. The elongation at break in the longitudinal direction of the non-perforated portion is also not necessarily limited, but is preferably 5.0% to 25.0%. Within these ranges, the ratio of the elongation at break in the longitudinal direction of the perforated portion to the elongation at break in the longitudinal direction of the non-perforated portion ((elongation at break of perforated portion (longitudinal) total width) / (elongation at break of non-perforated portion (longitudinal) total width)) is preferably set to 34.5% to 55.0%.

[0082] Here, the tensile strength in the transverse direction of the non-perforated portion is not necessarily limited, and is expected to be 400–600 cN. The tensile strength in the transverse direction of the non-perforated portion refers to the tensile strength in the transverse direction of the portion between perforations where no perforations are formed. It is measured based on JIS P 8113:2006, using a test piece cut to the same width as the roll of toilet paper, with the paper width as the longitudinal direction and the distance between the clamps set to 100 mm in the transverse direction (CD direction). Furthermore, when clamping and mounting the test piece in the measuring device, it is folded in half along the transverse direction, then folded in half again along the transverse direction, resulting in a four-fold fold before mounting. Examples of measuring devices include the "Universal Tensile Compressor TG-200N" manufactured by Minebea and equivalent models. This tensile strength also refers to the tensile strength during drying (drying tensile strength). The unit is expressed in cN.

[0083] If the tensile strength in the transverse direction of the non-perforated area is within the aforementioned range, it possesses sufficient strength for further use. In particular, in paper, the tensile strength in the transverse direction is weaker than the tensile strength in the longitudinal direction. Therefore, if the tensile strength in the transverse direction of the non-perforated area is within the aforementioned range, it can be said that the possibility of breakage during use is small. Even if a slight longitudinal crack occurs at the cut end of the perforation, it is unlikely to break in the transverse direction, thus preventing the crack from progressing. Therefore, it is less likely to crack in the longitudinal direction along the perforation.

[0084] The spacing L6 between the perforations 11 in the embodiment is not necessarily limited. In toilet paper rolls, it is generally 100-300 mm. This range allows for the creation of toilet paper rolls that achieve the effects of the present invention. Because of its relation to the effect, the perforation spacing is preferably 180-280 mm, and more preferably 200-260 mm. The perforation spacing can be measured, for example, by pulling the roll out and using a JIS 1 grade ruler.

[0085] In the embodiment, the ratio of the length of the cut portion to the length of the connecting portion of the eyelet 11 (connection / cut) is not necessarily limited, but is preferably 20.0% to 50.0%. When the (connection / cut) ratio is less than 20%, there is a tendency for paper breakage during processing on the winding machine and accidental breakage outside the eyelet are to occur; when it exceeds 50.0%, there is a tendency for it to be difficult to cut during use, and for breakage outside the eyelet to increase. Specifically, the lengths of the cut portion and the connecting portion are preferably 0.5mm to 1.5mm and the length of the cut portion is 2.0mm to 5.0mm.

[0086] On the other hand, one aspect of the toilet paper roll of the present invention is that the basis weight of one layer is 11.0 to 16.5 g / m³. 2The toilet paper roll is made by laminating two layers of sheet material, forming embossing on the two layers, and then winding them together. The sheet material is made of 100% pure pulp or has a waste paper pulp content of less than 30%, and the thickness of the two layers is 140 to 220 μm.

[0087] Compared to the typical roll length of 25-35m for commercially available two-layer laminated toilet paper rolls made from pure pulp, as described above, the roll length of the toilet paper roll of the present invention is 55m or more, constituting a long dimension. Furthermore, the long-dimension roll of the toilet paper roll of this embodiment has a lower paper thickness or basis weight, correspondingly improving the aforementioned perforation problem, and making the paper soft, more preferably exhibiting smoothness. Moreover, although it is a long-dimension roll, it is tightly wound yet still results in a roll of toilet paper that is easily felt as soft.

[0088] One main reason is that the sheet material is made of 100% pure pulp or has a waste paper pulp content of less than 30%. The second reason is that it has an embossed texture. As for the waste paper pulp content, it is more preferably less than 20%, and especially more preferably less than 15%.

[0089] Regarding the relationship between the first main reason and the amount of waste paper pulp mixed with pure pulp or less waste paper pulp, the following points can be cited as examples.

[0090] Chapter 4, Papermaking Properties of Waste Paper Pulp (edited and published by the Pulp Technology Association, Pulp Manufacturing Technology Series 4, first edition published August 25, 2005), of "Waste Paper Pulp" states the following in Section 4, Summary.

[0091] "When repeated cycles of wetting and drying are performed, the fibers of chemical pulps such as coniferous kraft pulp become tightly bound together and keratinized, impairing the pulp's swelling properties, reducing its water retention, and causing it to lose its softness and become hard. If the bonding ability between the fibers is greatly reduced and the paper is made into sheets, the density decreases and it becomes fluffy, increasing its breaking strength, stiffness, specific scattering coefficient, opacity, and air permeability. ... The curled, hard fibers are not easily compressed by the suction box of the paper part and cannot be squeezed out, thus deteriorating its water permeability. The hard fibers form a paper layer, thus reducing its smoothness and compressibility."

[0092] Regarding the second main reason for embossing, the embossing process enhances the flexibility of the sheet material by creating embossed recesses and embossed protrusions. In this embodiment, this embossing is preferably double-embossed. The reasons are as follows.

[0093] As mentioned above, the "previously long-size roll product," when being a two-layer embossed toilet paper mixed with waste paper pulp, was made using single embossing. The reason for using single embossing instead of double embossing in the "previously long-size roll product" is as follows: In a two-layer double-embossed product, raised embossing is formed on the inner surface (the side not in contact with the hand) of each of the two layers. Therefore, compared to toilet paper made from sheets of normal length, when rolling into a long roll of toilet paper, it is stretched more vigorously. As a result, in long-size toilet paper, the pressure in the thickness direction of the sheet inside the roll is higher. If tension is applied to each individually embossed sheet, causing the sheets to be stretched individually, the raised parts interfere with each other, and the embossing shape cannot be maintained as in the case of single embossing. This results in reduced surface quality on the outer surface of the toilet paper roll and less distinct embossing (shape). Furthermore, applying tension to each individually embossed sheet to stretch it causes slight misalignment of the perforations in each sheet, resulting in toilet paper rolls that are difficult to form stably with the perforations. Based on this mechanism and reasoning, it is believed that the target quality is difficult to ensure in double-embossed products, so a single-embossed form is used in "previously long-size roll products".

[0094] Toilet paper base paper mixed with waste paper pulp loses its softness and becomes stiff, thus becoming hard. The paper layers are formed from these stiff fibers (lacking softness), resulting in reduced smoothness and a rough surface. Furthermore, when the "previously long-size roll" is a two-layer embossed toilet paper mixed with waste paper pulp, single embossing is primarily used. However, in single embossing (made from... Figure 1 In the symbol E1, two layers of sheet material are treated as one sheet and shaped using the same pattern. Therefore, compared to pulp products, its embossed shape is stronger and less prone to crushing. (The reverse side, for example, can be self-adjusting.) Figure 1 As can be inferred from the outline diagram, the difference between its surface and back is obvious. The surface of the embossed protrusion (represented by the symbol A) protruding from the embossed back side (inner side of the roll) becomes coarser, resulting in a rough texture.

[0095] On the other hand, regarding one aspect of the toilet paper of the present invention, its raw material is 100% pure pulp or approximately pure pulp containing less than 30% waste paper pulp. Because the pulp fibers of the paper base are soft, the paper is soft. A soft paper layer is formed by the soft fibers, so the paper is soft in the thickness direction and becomes a soft sheet.

[0096] Furthermore, toilet paper rolls made from 100% pure pulp or near-pure pulp have a soft texture and fewer stiff fibers, resulting in a smooth, silky surface with excellent surface properties. And, as... Figure 2As shown in the schematic diagram, because it is double-embossed (represented by the symbol E2), recesses are formed on both sides, making the surface and back of the laminated sheet have little or no difference. Moreover, the recesses on both sides of the laminated sheet allow the user to touch the peaks or gently angled portions between the recesses with their fingertips, and to touch the surface and back with multiple fingers. Because of the relationship between these portions on the surface and back, the fingertips feel soft. Furthermore, the combination of the soft pulp material and the peaks and gently angled portions creates a strong sense of smoothness through the fingertips.

[0097] Furthermore, as described in this embodiment, for long-sized rolled products, especially for long-sized rolled products with double embossing, the problem of long-sized rolled products being located in the holes can be improved. Moreover, it can be seen that if the rolling form of the double embossed sheet is improved, the difficulties associated with the aforementioned rolling process can be resolved.

[0098] For the main reasons mentioned above (including the creping factor), it was previously impossible to expect to obtain long-length, soft, and smooth toilet paper rolls using waste paper pulp or materials with a high content of waste paper pulp.

[0099] Set the basis weight of the first layer to 11.0–16.5 g / m³, as described above. 2 The expected value is 11.5–16.0 g / m³. 2 The specific expectation is 14.5 g / m³. 2 Above but less than 16.0g / m 2 If the basis weight is too high, the winding length must be shortened; conversely, if it is too low, the strength will be reduced, and the embossing effect will not be fully utilized, resulting in insufficient softness. The basis weight is measured based on JIS P8124 (2011) as the basis weight for each sheet.

[0100] The thickness of the two-layer paper is set to 140–220 μm as described above. The desired thickness is 145–210 μm, with a particularly desirable thickness of 150–205 μm. The same evaluation criteria as for the basis weight apply. That is, if the paper thickness is too thick, the winding length must be shortened; conversely, if it is too thin, the strength will decrease, and the embossing effect will not be fully realized, resulting in insufficient flexibility. This paper thickness is the value measured under the same conditions using a "PEACOCK G type" (manufactured by Ozaki Corporation) dial thickness gauge after the two-layer test piece has been thoroughly conditioned according to JIS P 8111 (1998). Specifically, first ensure there is no dust or debris between the plunger and the measuring stage. Then, lower the plunger onto the measuring stage and calibrate the scale of the aforementioned needle plate thickness gauge until it coincides with the zero point. Next, raise the plunger and place the test piece on the measuring stage. Then, slowly lower the plunger at a speed of less than 1 mm / s and read the measured value. During the measurement, ensure that the terminal of the metal plunger (a circular flat surface with a diameter of 10 mm) is perpendicular to the paper plane. The measured paper thickness is set as the average value obtained from 10 measurements.

[0101] Furthermore, regarding the toilet paper of the embodiment, regarding the surface properties of the sheet, it is particularly preferred that the Sq (μm) of the two outer surfaces of the two-layer sheet is 9.2 (μm) to 15.0 (μm).

[0102] [Sq(μm)]

[0103] This is based on the international standard ISO 25178, which specifies the surface properties (surface roughness measurement) and evaluation methods for surface roughness. Specifically, the height (Sq) is expressed as the root mean square height, equivalent to the standard deviation of the distance from the average surface. In this implementation, the base paper weight and thickness are reduced to the level of tissue paper, the creping rate is set to a range of 15-19%, and the peelability from the dryer is adjusted by the shape of the creping doctor blade and the release agent to achieve a soft and smooth surface paper. The Sq (μm) value, equivalent to the standard deviation of the height, is obtained by measuring 3D image data using a VR6200 one-shot 3D shape measuring machine and performing image analysis using the VRA2 analysis software. A large value indicates a noticeable unevenness on the surface (the part that touches the skin) when the sheet is touched. A small value indicates a flat, hard texture when the sheet is touched. It is believed that if Sq is large, the roughness produced by the protrusions and peaks can be felt when touching the sheet; if Sq is small, there is no roughness and the surface feels flat when touched by the finger.

[0104] [Sq Measurement Method Based on One-shot 3D Shape Measuring Machine VR6200]

[0105] After measuring the 3D image data of the sheet surface and performing surface shape correction (removing undulations, correcting intensity

[20] ) using image processing, a reference plane is selected and the measurement area is set using arbitrary settings of the area setting. The measurement area Ar of Sq (μm) is as follows: Figure 5 (A) shows a 3D image taken within the range Ar of the embossed recesses, which is independent of the embossed recesses, in the middle portion of the embossed recesses adjacent to E,E. Data analysis was then performed to measure the image. Specifically, in cases where the embossed recesses protrude into peak-shaped or dome-shaped patterns, the top of the protruding portion created by the embossing process was measured. Surface roughness was measured across multiple circular areas with a diameter of 1 mm, and the image resolution area was measured by aligning multiple measurement surfaces with a 30 mm diameter. 2 ~40mm 2 The image resolution area is measured and analyzed using 3D imaging. The measurement parameter is "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 will be flat and not feel soft when touched. If Sq (μm) exceeds 15.0 (μm), the surface will be uneven and not feel smooth and soft. Moreover, the ratio of Sq1 (μm) on the outer side of the sheet on the outer side of the roll to Sq2 (μm) on the outer side of the sheet on the inner side of the roll is expected to be Sq1 / Sq2 = 0.80 to 1.25. Within this range, the difference between the surface and the back is small and the difference in unevenness between the surface and the back is not easily felt. The measurement is performed by taking 10 points at 30% of the position from the outermost end of the roll, and the average value is set as the Sq value.

[0106] The depth of the embossed recesses in this invention is not limited and can be set to the same depth as recesses produced by conventional embossing processes. Furthermore, it can be adjusted appropriately. Here, the embossing pattern of the embodiment is not necessarily limited. Embossing can be set to suitable embossing patterns such as micro embossing, dot embossing, or designed embossing.

[0107] Furthermore, in appropriate embossing examples, the area of ​​the recessed portion is 1.0–2.5 mm. 2 The density is 5.0–50 particles / cm³. 2 This improves the softness of the toilet paper, enhancing the softness of the roll, making it easier for consumers to feel when holding it. Especially... Figure 3As shown, on the entire paper surface, there is a recess 31 with a square base of diagonal length L4 × diagonal length L4 = 1.0~1.5mm × 1.0~1.5mm. Figure 3 (A)), or the recess 32 formed by approximately squares extending outward from the four corners of the square towards the diagonal. Figure 3 (B) The toilet paper is arranged in a diagonal grid pattern with a center spacing L5 of 4.5 to 5.5 mm and an angle of 45° relative to the width direction. It also has valley lines 33 extending from the four corners of the recesses between each other. Furthermore, the valley lines 33 are ideally arranged in a gradually sloping arc shape, being deepest at the four corners of the recesses 31 (32) and shallowest in the middle between the recesses. This embossing pattern, with its valley lines at a 45° angle to the width direction, disperses tension during winding, making it easier to adjust the winding stiffness. Even when winding long sections, the embossing is less likely to become inconspicuous. Moreover, the toilet paper itself exhibits excellent softness and absorbency for feces.

[0108] [Elongation at Take-up Length (%)]

[0109] The elongation at take-up length is preferably 0.9% to 4.5%, and more preferably 1.0% to 4.3%. Elongation at take-up length refers to the elongation of the sheet of material that is stretched and wound within the roll. Since toilet paper rolls consist of several layers of soft and thin sheet material, the elongation at take-up length for two layers becomes a factor in adjusting the softness of the roll to a more suitable level.

[0110] The elongation at take-up length is determined by the take-up length L0 and the sheet length Ls (m) within the roll, according to the formula: elongation at take-up length (%) = (Ls-L0) / L0…[Formula 1]. Here, the take-up length L0 (m) is obtained by the following method: The number of sheets is counted by dividing the sheet into units based on the number of holes. The take-up length is determined by taking the second to sixth sheets as the first group. The second sheet is the sheet following the outermost rolled sheet (the first sheet) including the tail seal of the roll. Every five consecutive sheets are then cut using scissors and the sheet size is actually measured. The last group is taken from the innermost roll without a pick-up portion containing two sheets. This last group is designated as the nth group. When actually measuring the sheet size, the weight of five consecutive sheets (groups) placed on a flat surface is measured using a JIS 1 grade metal ruler. First, the average group length is obtained. The average group length is calculated using the formula: Average Group Length (m) = {Length of the first group + Length of the second group + ... + Length of the nth group} ÷ n... [Formula 2]. The winding length L0 is calculated using the formula: L0(m) = (Average Group Length) × n + (Average Group Length / 5) × {1 + (Number of innermost rolled sheets including the pick-up section that cannot form a group)}... [Formula 3]. Furthermore, the sheets at the end seal and pick-up section have adhesive residue and wrinkles, making it impossible to accurately measure the sheet length. Therefore, the length is converted to the average sheet length (average group length / 5) for calculation.

[0111] The sheet length Ls(m) inside the roll represents the winding length of the sheet inside the roll, and is obtained in the following order.

[0112] (1) Use a magic pen or similar tool to draw a straight line on the side of the roll, from the outermost part of the roll to the paper tube and through the central axis of the paper tube. Align the mark on the outermost part of the roll (the mark on the magic pen) with the outermost end of the sheet.

[0113] (2) Count the number of markings with a magic pen at the width end of the unwound sheet and set it as the number of overlapping layers of the sheet in the roll, P1 (2 layers). For the sheet weight including the pick-up section that cannot form a group, calculate the number of layers P2 by (number of sheets that cannot form a group × average sheet length ÷ [(paper tube diameter r) × π]) and sum them up to set it as the number of sheet layers P.

[0114] (3) Cross-sectional area of ​​the roll S (cm²) 2 =π / 4 × [(drum diameter R)] 2 -(paper tube diameter r) 2 ...[Equation 4], S in cm 2 In terms of units, the roll diameter R and paper tube diameter r are converted to cm.

[0115] (4) Moreover, when the thickness of the sheet material inside the roll in the roll state is set as T (mm), the area formed by winding the sheet material into a roll and stacking it is taken as the roll cross-sectional area to obtain T (mm) = 1 / 2 × (Rr) / (P × 10)... [Equation 5]

[0116] (5) Furthermore, S(cm) 2 = Length of sheet in roll Ls (m) × T (mm) × 10… [Formula 6], where T (mm) is the thickness of the sheet in roll.

[0117] (6) Therefore, the length of the sheet inside the roll is Ls(m) = S(cm). 2 ) / (T(mm)×10), so substituting into [Equation 4] and [Equation 5], we get Ls=π / 2×(R+r)×P÷100…[Equation 6]

[0118] Thus, the winding length elongation (%) in [Equation 1] represents the elongation (%) of the sheet that is stretched and wound within the roll. The larger the elongation (%), the more it is stretched within the roll.

[0119] If the elongation at take-up length (%) is less than 0.9%, the sheet has high tensile rigidity, making it difficult to stretch and resulting in a hard paper. This high tensile rigidity necessitates deeper embossing to strengthen the embossing and prevent it from crumbling, resulting in a rough texture. If the elongation at take-up length (%) exceeds 4.5%, the sheet has too low tensile rigidity. It stretches easily, becoming an overly soft paper that loses its weight and solidity. Furthermore, the low tensile rigidity causes the embossing to stretch as well, leading to its crumbling and reduced clarity, thus deteriorating the appearance.

[0120] Furthermore, regarding the toilet paper of the embodiment, regarding the surface properties of the sheet, it is particularly preferred that the two outer surfaces of the two-layer sheet have a [Spd(1 / mm)] ≤ 1 / mm 2 The value is 12.5–17.4 (1 / mm). 2 ).

[0121] [Spd(1 / mm 2 )]

[0122] Spd(1 / mm 2 According to the definition of surface shape in ISO 25718. In this embodiment, the base paper weight and thickness are reduced to the level of toilet paper, the crease rate is set to a range of 15-19%, and the peelability from the dryer is adjusted by the shape of the crease scraper, the release agent, etc., to achieve a soft and smooth surface paper texture. 3D image data is measured using a VR6200 one-shot 3D shape measuring machine, and Spd (1 / mm²) is obtained by image analysis using the VRA2 analysis software.2 ) represents the "peak density", per 1 / mm 2 Number of vertices (1 / mm) 2 The larger the apex, the more compactly the apex is arranged, resulting in a smooth, skin-like feel. The apex is presumably the peak formed by wrinkles or other features on the surface of the sheet. Furthermore, since toilet paper rolls consist of several layers of soft, thin sheet, the surface properties of the two outer surfaces of the two layers of sheet become a factor affecting the softness of the roll.

[0123] [SPD measurement method based on VR6200 One-shot 3D shape measuring machine]

[0124] After measuring the 3D image data of the sheet surface and performing surface shape correction (removing undulations, correcting intensity

[20] ) using image processing, the reference plane is selected and the area of ​​the measurement object is set using arbitrary settings of the area setting. Spd(1 / mm 2 The measurement region Ar, such as Figure 5 (A) shows a 3D image taken within the range Ar of the embossed recesses, which is independent of the embossed recesses, in the middle portion of the embossed recesses adjacent to E,E. Data analysis was then performed to measure the image. Specifically, in cases where the embossed recesses protrude into peak-shaped or dome-shaped patterns, the top of the protruding portion created by the embossing process was measured. Surface roughness was measured across multiple circular areas with a diameter of 1 mm, and the image resolution area was measured by aligning multiple measurement surfaces with a 30 mm diameter. 2 ~40mm 2 The image resolution area was measured and analyzed using 3D imagery. The applicable measurement parameters were "morphological parameters Spd(1 / mm)". 2 )". If Spd(1 / mm 2 Less than 12.5 (1 / mm) 2 The surface will be rough and the skin feel will be poor. If Spd(1 / mm) 2 ) Exceeding 17.4 (1 / mm 2 The surface becomes hard and its surface properties deteriorate. Furthermore, the Spd1 (1 / mm) of the sheet on the outer side of the roll... 2 Spd2 (1 / mm) of the sheet on the inner side of the roll 2 The desired ratio of Spd1 / Spd2 is 0.80 to 1.25. If it falls outside this range, there will be a difference between the surface and back sides of the sheet, resulting in a rough feel. If it falls within this range, the roll will feel softer. This is believed to be due to the contact between the surfaces of adjacent sheets wound into a roll. Furthermore, the measurement is performed by taking 10 points at 30% of the distance from the outermost end where use begins, and setting the average value as the Spd value.

[0125] Furthermore, regarding the toilet paper of the embodiment, regarding the softness of the sheet, it is particularly preferable that the softness of a single layer is 0.6 to 2.1 cN / 100mm. Since toilet paper rolls consist of soft and thin sheets wound into several layers, "the softness of a single sheet" becomes a factor in adjusting the softness of the roll to be more appropriate.

[0126] [Softness]

[0127] The values ​​were determined using the JIS L 1096E method and based on the handle-o-meter method. The test piece was set to 100mm × 100mm in size, with a gap of 5mm. For each layer, five measurements were performed in both the longitudinal and transverse directions, and the average of all ten measurements was recorded.

[0128] Furthermore, regarding the toilet paper of the embodiment, regarding the surface properties of the sheet, it is particularly preferred that the Spc (1 / mm) of the two outer surfaces of the two-layer sheet is 4.1 (1 / mm) to 6.9 (1 / mm).

[0129] [Spc(1 / mm)]

[0130] Based on the international standard ISO 25178 for surface properties (surface roughness measurement) and evaluation methods for surface roughness. In this implementation, the base paper weight and thickness are reduced to the level of toilet paper, the crease rate is set to a range of 15-19%, and the peelability from the dryer is adjusted by the shape of the crease scraper, the release agent, etc., to achieve a soft and smooth surface paper. Three-dimensional image data is measured using a VR6200 one-shot 3D shape measuring machine, and the Spc (1 / mm) is obtained by image analysis using the VRA2 analysis software. This Spc (1 / mm) represents the average of the main curvature of the top of the convex shape of the surface. A small Spc (1 / mm) value indicates that the point of contact with other objects is rounded, and the resistance felt by the finger is high. Conversely, a large Spc (1 / mm) value indicates that the point of contact with other objects is sharp, and the resistance felt by the finger is low. The top of the convex shape of the surface is presumably the peak formed by creases on the sheet surface. Furthermore, the top of the convex shape on this surface has a different meaning than the top of the convex part produced by embossing.

[0131] [Spc measurement method based on One-shot 3D shape measuring machine VR6200]

[0132] After measuring the 3D image data of the sheet surface and performing surface shape correction (removing undulations, correcting intensity

[20] ) using image processing, the reference plane is selected and the area of ​​the measurement object is set using arbitrary settings of the area setting. The measurement area Ar of Spc (1 / mm) is as follows: Figure 5 (A) shows a 3D image taken within the range Ar of the embossed recesses, which is independent of the embossed recesses, in the middle portion of the embossed recesses adjacent to E,E. Data analysis was then performed to measure the image. Specifically, in cases where the embossed recesses protrude into peak-shaped or dome-shaped patterns, the top of the protruding portion created by the embossing process was measured. Surface roughness was measured across multiple circular areas with a diameter of 1 mm, and the image resolution area was measured by aligning multiple measurement surfaces with a 30 mm diameter. 2 ~40mm 2 The image resolution area is measured and analyzed using 3D image measurement. The measurement parameter is "morphological parameter Spc (1 / mm)". If Spc (1 / mm) is less than 4.1 (1 / mm), the surface smoothness is poor and the skin feel is unpleasant. If Spc (1 / mm) exceeds 6.9 (1 / mm), the surface is hard and the surface smoothness to the skin feel is poor. Moreover, the ratio of Spc1 (1 / mm) on the outer side of the sheet on the outer side of the roll to Spc2 (1 / mm) on the outer side of the sheet on the inner side of the roll is expected to be Spc1 / Spc2 = 0.80 to 1.25. If it is within this range, the difference between the surface and the back side is small and the difference in friction between the surface and the back side is not easily felt. In addition, the measurement is performed by taking 10 points at 30% of the position from the outermost end of the starting point of use and setting the average value as the Spc value.

[0133] Furthermore, regarding the toilet paper of the embodiment, regarding the surface properties of the sheet, it is particularly preferred that the Sdr (1 / 1000) of the two outer surfaces of the two-layer sheet is 14.5 (1 / 1000) to 45.5 (1 / 1000).

[0134] [Sdr(1 / 1000)]

[0135] This is based on the international standard ISO 25178, which specifies the surface properties (surface roughness measurement) and evaluation methods for surface roughness. Specifically, the unfolded area (surface area) of a defined region indicates the degree of increase in the area of ​​that defined region. In this implementation, the base paper weight and thickness are reduced to the level of toilet paper, the crease rate is set to a range of 15-19%, and the peelability from the dryer is adjusted by the shape of the crease scraper, the release agent, etc., to achieve a soft and smooth surface paper. Three-dimensional image data is measured using a One-shot 3D shape measuring machine VR6200, and the image is analyzed using the VRA2 analysis software. The resulting Sdr (1 / 1000) represents the unfolded area ratio of the interface as "(area including unevenness) / (surface area)-1". A large value indicates a soft feel in the thickness direction when touching the sheet, while a small value indicates a hard feel. A high Sdr value is believed to provide a soft, cushioned feel when touching raised or peaked areas; a low Sdr value results in a flat, unrefined feel when touched by the finger. The difference between the area (including the surface area) and the surface area is presumed to be caused by wrinkling or other defects on the sheet surface. Furthermore, the raised and peaked areas on this surface are distinct from those created by embossing.

[0136] [Sdr measurement method based on One-shot 3D shape measuring machine VR6200]

[0137] After measuring the 3D image data of the sheet surface and performing surface shape correction (removing undulations, correcting intensity

[20] ) using image processing, the reference plane is selected and the area of ​​the measurement object is set using arbitrary settings of the area setting. The measurement area Ar of Sdr(1 / 1000) is as follows. Figure 5 (A) shows a 3D image taken within the range Ar of the embossed recesses, which is independent of the embossed recesses, in the middle portion of the embossed recesses adjacent to E,E. Data analysis was then performed to measure the image. Specifically, in cases where the embossed recesses protrude into peak-shaped or dome-shaped patterns, the top of the protruding portion created by the embossing process was measured. Surface roughness was measured across multiple circular areas with a diameter of 1 mm, and the image resolution area was measured by aligning multiple measurement surfaces with a 30 mm diameter. 2 ~40mm 2The image resolution area is measured and analyzed using 3D image measurement. The measurement parameter is "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 soft and have a poor skin feel when touched. If Sdr(1 / 1000) exceeds 45.5(1 / 1000), the surface will feel excessively soft and become unreliable. Furthermore, the ratio of Sdr1(1 / 1000) on the outer side of the sheet on the outer side of the roll to Sdr2(1 / 1000) on the outer side of the sheet on the inner side of the roll is expected to be Sdr1 / Sdr2 = 0.80 to 1.25. Within this range, the difference between the surface and the back side is small, and the difference in friction between the surface and the back side is not easily felt. In addition, the measurement will be performed at 30% of the position from the outermost point where it is first used, taking 10 points and setting the average value as the Sdr value.

[0138] The measurement items for the implementation method can be determined based on the following measurements.

[0139] [Roll Width]

[0140] The width of the roll is measured at three points on the outer circumference of the roll using a JIS Class 1 metal ruler, with the axial length of the outer surface being averaged. The unit is mm, expressed to one decimal place.

[0141] [Roll diameter]

[0142] The drum diameter is measured at three points along its width using a Diameter Rule (MURATEC KDS) on the outside of the drum, and the average of the three measurements is calculated. The unit is mm, expressed to one decimal place.

[0143] [Paper tube diameter]

[0144] The diameter of the paper tube is measured at three points along its width using the Diameter Rule (MURATEC KDS) on the outside of the tube, and the average value of the three measurements is calculated. The unit is mm, expressed to one decimal place.

[0145] [Roll Density]

[0146] Roll density is calculated as (roll weight excluding paper tube (g)) ÷ (roll volume (cm³)). 3 The value is obtained by calculating the value using g / cm³. 3 This indicates the number of decimal places to three. Roll density (g / cm³) 3 = (winding length (m) × base weight (g / m³)) 2 () × number of layers × roll width (cm) / 100) ÷ (roll cross-sectional area (cm²)2 () × roll width (cm)

[0147] There are no particular limitations on the pulp fibers in toilet paper, but it is desirable that the content be 70-100% virgin pulp and 0-30% waste paper pulp. Compared to 100% virgin pulp, mixing in waste paper pulp allows for lower production costs. Furthermore, waste paper pulp, during the pulp recycling process from waste paper, tends to have finer fibers compared to the unrecycled pulp. This fiber property does not increase paper thickness, and the finer, denser fibers result in less paper strength. Excessive mixing would degrade the softness and smoothness of the paper. Therefore, considering the characteristics of waste paper pulp, its mixing ratio can be determined to be in the range of 0-30% by mass. Additionally, the type of waste paper pulp is not necessarily limited, but waste paper pulp made from milk carton waste paper and wood pulp waste paper is particularly desirable. These waste papers contain a large amount of raw materials derived from both coniferous tree bleached kraft pulp (NBKP) and broad-leaved tree bleached hardwood kraft pulp (LBKP), which makes them prone to paper stress.

[0148] On the other hand, it is particularly desirable to use 100% virgin pulp, and it is especially preferred that the virgin pulp is coniferous kraft pulp (NBKP) and broadleaf kraft pulp (LBKP). The mixing ratio of these is preferably NBKP:LBKP of 20:80 to 50:50.

[0149] Hereinafter, the effects of the toilet paper roll of the present invention will be further explained with reference to examples, comparative examples, and commercially available examples of toilet paper rolls.

[0150] [Example]

[0151] Furthermore, regarding the toilet paper in each example, it is designed to be toilet paper pulled from a roll of toilet paper. Additionally, double embossing is a feature... Figure 2 The morphology of the two concave portions is shown. Furthermore, the surface and back concave portions E2 in the figure are opposite faces, but it is not necessary for them to be opposite faces. The physical properties and composition of each example are shown in Table 1. Among them, commercially available products 1 and 3 are single-embossed, so the measurements of Spc, Spd, Sdr, and Sq in commercially available products 1 and 3, especially the measurement area Ar on the surface formed by the protrusions produced by the embossing process, are set as follows: Figure 5 (B) shows the top area of ​​the raised portion E' produced by embossing. This is because the surface formed by the raised portion produced by embossing in a single embossing, especially the top of the raised portion, becomes a part that is easily accessible to the hand.

[0152] Functional evaluation tests were conducted on rolls and sheets of toilet paper for examples, comparative examples, and commercially available examples. The tests were conducted by 17 subjects, and the average score of the 15 scores after removing the highest and lowest scores was taken as the evaluation score.

[0153] The sensory evaluation tests for rolls and sheets involved subjects actually using the various rolls of toilet paper in a holder over a one-week period. Regarding the cutting at the eyelets, the evaluation was conducted relative to each item, including "no accidental breakage at the eyelets," "no breakage caused by hands and fingertips when cutting at the eyelets," "no longitudinal tearing along the eyelets when cutting at the eyelets," "softness of the sheet against the skin," "smoothness of the sheet against the skin," "difference between the front and back of the sheet," "buffering in the thickness direction of the sheet," "unbreakability of the sheet," "clarity of the embossing of the roll," and "softness of the roll." Commercially available product 1 (long roll) was used as the benchmark. The evaluation is based on the following criteria: 4 points for products of the same quality as product 1, 5 points for products slightly better than product 1, 6 points for products better than product 1, 7 points for products significantly better than product 1, 3 points for products slightly worse than product 1, 2 points for products worse than product 1, and 1 point for products significantly worse than product 1. The average score is then used to make the final judgment.

[0154]

[0155]

[0156] The shape and density of the embossing are substantially the same in Examples 1-7 and Comparative Examples 1-2. Furthermore, in Examples 1 and 2, the connection: cut length is set to 1.0 mm: 2.0 mm. In Examples 3-7, it is set to 1.22 mm: 2.58 mm. For commercially available products, Commercial Product 2 has a connection of 1.00 mm: 0.985 mm.

[0157] Based on the results in Table 1, Examples 1 to 7 were compared with commercially available Product 1 and Comparative Examples of the same length. Regarding the cutting of the eyelets, the examples received high ratings for "no accidental breakage at the eyelets," "no breakage caused by hands and fingertips when cutting the eyelets," and "no longitudinal cracking along the eyelet path when cutting the eyelets." Furthermore, the evaluations of the sheet material itself, including "softness of the sheet to the touch," "smoothness of the sheet to the touch," and "buffering in the thickness direction of the sheet," as well as the evaluations of the roll shape, such as "lightness of the roll," were also significantly excellent.

[0158] Furthermore, in detail, Examples 1 to 7, compared with commercially available product 1 and Comparative Example 2 of the same length, received high evaluations for both sheet and roll, and were rated as high or better than those for commercially available products 2 and 3, which have shorter roll lengths. That is, both the sheet and roll were designed to feel soft. Examples 1 to 7, although long-length rolls, received high evaluations for the softness of both the sheet and roll. This is believed to be because double embossing involves embossing on each layer, thus dispersing the force inside the roll when compressed, reducing the difference in surface properties between the front and back of the sheet, and combined with the surface properties of the sheet itself, resulting in a softer roll that is easier to feel compared to single-embossed long-length rolls.

[0159] Furthermore, Examples 1 to 7, compared with commercially available product 3 and Comparative Example 2 of the same length, exhibit a softness as low as 0.9 to 2.0 cN / 100m. They also have a high roll length elongation of 1.7 to 4.2%, making the sheet easily stretchable under tension and exhibiting a slightly soft feel, thus improving the softness evaluation of the sheet in these examples. Moreover, the evaluation is higher than that of commercially available products 2 and 3, which have shorter roll lengths. This is believed to be related to the lower basis weight resulting from the longer dimensions. Furthermore, the sheet's lightness and softness are rated higher than that of commercially available product 3, which has shorter roll lengths. This is believed to be due to the double embossing.

[0160] Furthermore, compared with commercially available product 1 and comparative examples of the same length, the sheets of Examples 1 to 7, which were evaluated as examples with a lower MMD of 5.8 to 6.8, were smoother.

[0161] [Industry availability]

[0162] The toilet paper rolls of the present invention can be used not only for household use but also for commercial purposes (such as in airport toilets, hospitals, etc., used by an unspecified number of people).

Claims

1. A type of toilet paper roll, wherein the basis weight of one layer is 11.0–16.5 g / m³. 2 The toilet paper roll is made of two layers of sheet material, with embossing formed on the two layers, and then wound up. Its characteristic is that... The two-layer paper has a thickness of 140–220 μm and a winding length of over 55 m; the roll diameter is 110–130 mm. The aforementioned sheet material is made of 100% pure pulp, or contains less than 30% waste paper pulp. The part with holes has a tensile strength of 1300–1800 cN in the longitudinal direction across its entire width, while the part with holes has a tensile strength of 580–780 cN in the longitudinal direction across its entire width. The aforementioned eyelet has an elastic modulus of 5.0–33.0 MPa in the longitudinal direction across its full width, and The ratio of the elastic modulus of the aforementioned perforated portion in the longitudinal direction of the full width to the elastic modulus of the aforementioned non-perforated portion in the longitudinal direction of the full width is 70.0% to 100.0%.

2. The toilet paper roll according to claim 1, wherein, The elastic modulus of the aforementioned non-porous eye portion in the longitudinal direction of the full width is 5.5–36.0 MPa.

3. The toilet paper roll according to claim 2, wherein, The tensile strength in the transverse direction of the aforementioned non-porous part is 400-600 cN.

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