Kitchen paper roll

Abstract

To provide a compact kitchen paper roll having a long wound length, suppressed in a degree of curl of kitchen paper, and making the usability of kitchen paper excellent.SOLUTION: A kitchen paper roll is obtained by winding in a roll state, kitchen paper having an embossment laminate structure in which two sheets applied with embossment are integrated via an adhesive paste, and formed with fracture perforations at every prescribed interval along a longitudinal direction. The kitchen paper roll is such that: a basis weight of the kitchen paper is 32 g / m2 or more and 60 g / m2 or less; a wound length of the kitchen paper roll is 25 m or more and 65 m or less; a roll density of the kitchen paper roll is 0.50 m / cm2 or more and 1.10 m / cm2 or less; and a geometric average ply peel strength of a ply peel strength in an MD direction of the kitchen paper and a ply peel strength in a CD direction is 0.100 N or more and 0.165 N or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] Kitchen paper rolls are used in home kitchens and restaurant kitchens for purposes such as wiping up moisture and oil. Generally, a kitchen paper roll consists of two embossed sheets bonded together with adhesive, forming an embossed laminated structure. This roll is wound into a holder and used in a way that allows it to be unwound. When using it, the required amount of kitchen paper is unwound from the roll and cut along the perforations provided on the paper for wiping up moisture and oil. [Background technology]

[0002] For this type of kitchen paper roll, there is a demand for a compact roll with a longer length for ease of carrying and storage (Patent Document 1). [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2018-90270 [Overview of the project] [Problems that the invention aims to solve]

[0004] However, with compact kitchen paper rolls that have a longer roll length, the roll generally becomes tighter. Consequently, the degree of curl in the kitchen paper obtained when unwinding and cutting the required amount from the roll increases, and in some cases, the kitchen paper becomes rolled into a cylindrical shape, which is a problem as it makes the kitchen paper less convenient to use.

[0005] The present invention aims to provide a kitchen paper roll that is long and compact, yet offers excellent usability by sufficiently suppressing the degree of curling of the kitchen paper when the required amount is unwound and cut from the roll. [Means for solving the problem]

[0006] In order to solve the above problems, the inventors have conducted diligent studies and have come up with a kitchen paper roll in which two embossed sheets are integrated via an adhesive to form an embossed laminated structure, and perforations for tearing are formed at predetermined intervals along the longitudinal direction (MD direction), wherein the basis weight of the kitchen paper is 32 g / m² or more and 60 g / m² or less, the length of the kitchen paper roll is 25 m or more and 65 m or less, and the winding density of the kitchen paper roll is 0.703 m / cm² or more. 0.992 The density is less than or equal to m / cm², and the geometric mean ply peel strength of kitchen paper, calculated as the ply peel strength in the MD direction and the ply peel strength in the CD direction, is 0.100 N or greater. 0.161 The ply peel strength was found to be less than or equal to N, and was determined in accordance with the measurement of peel-off adhesive strength of JIS Z 0237, using a sample with a length of 300 mm and a width of 24 ± 0.5 mm. Two sheets constituting the sample were pulled perpendicularly apart with a chuck spacing of 8 cm and a set tensile speed of 300 mm / min. The measurement value for the first 10 mm was treated as noise, and the average measurement value of the ply peel strength until 50 mm was peeled was determined. The ply peel strength in the MD direction was measured using a sample with the MD direction of the kitchen paper as the longitudinal direction, and the ply peel strength in the CD direction was measured using a sample with the CD direction of the kitchen paper as the longitudinal direction. It was found that the above problem can be solved by using a kitchen paper roll.

[0007] Specifically, the present invention has the following configuration. [1] A kitchen paper roll having an embossed laminated structure in which two sheets each with an emboss are integrated via an adhesive paste and perforation lines are formed at predetermined intervals along the longitudinal direction, and the kitchen paper is wound in a roll, where the basis weight of the kitchen paper is 32 g / m 2 or more and 60 g / m 2 or less, the winding length of the kitchen paper roll is 25 m or more and 65 m or less, the winding density of the kitchen paper roll is 0.703 m / cm 2 or more 0.992 m / cm 2 or less, and the geometric mean ply peel strength between the ply peel strength in the MD direction and the ply peel strength in the CD direction of the kitchen paper is 0.100 N or more 0.161 N or less. The ply peel strength is determined according to the measurement of the peel adhesion of JIS Z 0237. Using a sample with a length of 300 mm and a width of 24 ± 0.5 mm, the two sheets constituting the sample are pulled vertically at a chuck interval of 8 cm and a set tensile speed of 300 mm / min to be peeled. The measured value for the first 10 mm is regarded as noise, and the average of the measured values of the ply peel force until 50 mm is peeled is obtained. The ply peel strength in the MD direction is measured using a sample with the MD direction of the kitchen paper as the longitudinal direction, and the ply peel strength in the CD direction is measured using a sample with the CD direction of the kitchen paper as the longitudinal direction. A kitchen paper roll characterized by the above. [2] The kitchen paper roll according to [1], where the predetermined interval of the perforation lines is 180 mm or more and 250 mm or less. [3] The kitchen paper roll according to [1] or [2], characterized in that the density of the kitchen paper is 0.080 g / cm3 or more and 0.130 g / cm3 or less. [4] The kitchen paper roll according to any one of [1] to [₃], characterized in that the pasting area ratio by the adhesive paste is 5% or more and 15% or less. [5] The kitchen paper roll according to any one of [1] to [4], characterized in that the embossed laminated structure is a nested embossed laminated structure.

Advantages of the Invention

[0008] According to the present invention, there is provided a kitchen paper roll having a long winding length and being compact, while the degree of curling of the kitchen paper obtained when the required amount of kitchen paper is unwound from the roll and cut during use of the kitchen paper is sufficiently suppressed without inconvenience, and the kitchen paper roll has good usability of the kitchen paper.

Brief Description of the Drawings

[0009] [Figure 1] FIG. 13 is a schematic diagram for explaining the configuration of a kitchen paper roll and kitchen paper according to an embodiment of the present invention. [Figure 2] FIG. 14 is a schematic diagram for explaining an example of kitchen paper roll manufacturing equipment.

Embodiments for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following embodiments and drawings are described for illustrative purposes and do not limit the present invention.

[0011] <First Embodiment> FIG. 1 is a schematic diagram for explaining the configuration of a kitchen paper roll and kitchen paper according to an embodiment of the present invention. (a) of FIG. 1 is an overall perspective view of a kitchen paper roll 1 according to the first embodiment of the present invention. (b) of FIG. 1 is a schematic enlarged view of a portion indicated by reference sign Ib in (a) of FIG. 1. (c) of FIG. 1 is a schematic cross-sectional view taken along the line indicated by reference sign Ic-Ic in (b) of FIG. 1.

[0012] (Kitchen Paper Roll) Referring to Figure 1(a), the kitchen paper roll 1 according to an embodiment of the present invention is a two-ply kitchen paper roll 1 in which so-called two-ply kitchen paper 10, consisting of two sheets 11 and 12, is wound in a roll shape around a cylindrical core paper tube 5.

[0013] (Sheet) The sheets 11 and 12, which are components of the kitchen paper 10, are obtained by papermaking a slurry containing pulp components, which are fiber raw materials.

[0014] (Pulp components) Pulp components can include wood pulp, non-wood pulp, and recycled paper pulp.

[0015] Examples of wood pulps manufactured using wood as a raw material include hardwood pulp (hardwood kraft pulp (LKP)), softwood pulp (softwood kraft pulp (NKP)), sulfite pulp (SP), dissolved pulp (DP), soda pulp (AP), unbleached kraft pulp (UKP), oxygen-bleached kraft pulp (OKP), and other chemical pulps. Other examples include semi-chemical pulps such as semi-chemical pulp (SCP) and chemigroundwood pulp (CGP), as well as mechanical pulps such as crushed wood pulp (GP) and thermomechanical pulps (TMP, BCTMP), but these are not particularly limited.

[0016] Non-wood pulps produced from plants and animals other than wood include, but are not limited to, cotton pulps such as cotton linters and cotton lint, non-wood pulps such as hemp, straw, and bagasse, and cellulose, chitin, and chitosan isolated from sea squirts and seaweed.

[0017] Recycled paper pulp refers to pulp manufactured using recycled paper, that is, pulp that has already been made from paper. Examples of recycled paper pulp include, but are not limited to, so-called milk carton pulp, which is made from paper cartons used for filling and packaging liquids such as milk cartons, and deinked pulp, which is made from newspapers and magazines.

[0018] The pulp components may be one type alone or a mixture of two or more types. The pulp components may differ between sheet 11 and sheet 12. These pulp components greatly affect the quality of the kitchen paper 10, so they are blended appropriately in predetermined types and proportions according to the required quality. For example, only wood pulp (at 100% by mass) can be used as the pulp component.

[0019] Preferably, at least one type of wood pulp can be selected from softwood pulp and hardwood pulp. Softwood pulp has long, strong fibers and can impart strength to the sheet being made. Hardwood pulp has short, flexible fibers and can provide uniformity, good texture, and softness to the sheet being made. In embodiments of the present invention, it is preferable to use softwood pulp and hardwood pulp in combination, and more preferably to use softwood kraft pulp (NKP) and hardwood kraft pulp (LKP) in combination.

[0020] When using both softwood pulp and hardwood pulp, the L / N ratio, which indicates the mixing ratio (mass ratio) of softwood pulp and hardwood pulp, is preferably, for example, 10 / 90 to 90 / 10, more preferably 20 / 80 or higher, even more preferably 30 / 70 or higher, still more preferably 60 / 40 or higher, and even more preferably 80 / 20 or lower, and still more preferably 70 / 30 or lower.

[0021] (optional ingredient) Sheets 11 and 12 may contain various chemicals as optional components to ensure required quality and operational stability. Examples of optional components include dry strength agents, wet strength agents, softeners, bulking agents, dyes, fragrances, dispersants, water filtration improvers, pitch control agents, yield improvers, and sizing agents. Examples of dry strength agents include cationized starch, polyacrylamide (PAM), and carboxymethylcellulose (CMC). Examples of wet strength agents include polyamide epichlorohydrin, urea, melamine, and thermocrosslinkable polyacrylamide. Examples of softeners include anionic surfactants, nonionic surfactants, cationic surfactants, and amphoteric surfactants. The above optional components may be used individually or in combination of two or more. The optional components may differ between sheet 11 and sheet 12.

[0022] (Kitchen paper) Referring to Figure 1(a), in the kitchen paper roll 1 according to an embodiment of the present invention, the kitchen paper 10 is a 2-ply kitchen paper composed of two sheets 11 and 12, which is embossed over the entire surface and has tearing perforations 7 formed at predetermined intervals L.

[0023] (Embossed) Embossing refers to a configuration in which a sheet has raised areas on one of its surfaces and recessed areas formed by the reverse side of the raised areas on the other surface.

[0024] In detail, referring to Figures 1(b) and 1(c), each of the two sheets 11 and 12 constituting the two-ply kitchen paper 10 is embossed, so that sheet 11 includes a plurality of embossed portions 11e and surrounding unembossed portions 11ne, and sheet 12 includes a plurality of embossed portions 12e and surrounding unembossed portions 12ne.

[0025] Figure 1(b) shows the kitchen paper 10 as viewed from the side of sheet 11, which is the outer sheet of the kitchen paper roll 1, of the two sheets 11 and 12 that make up the kitchen paper 10. Hereinafter, the sheet that is the outer sheet of the kitchen paper roll 1, of the two sheets 11 and 12 that make up the kitchen paper 10, will be simply referred to as the "outer sheet," and the sheet that is the inner sheet of the kitchen paper roll 1, of the two sheets 11 and 12 that make up the kitchen paper 10, will be simply referred to as the "inner sheet."

[0026] Referring to Figure 1(a), in this example, an embossed pattern consisting of numerous embossed portions 11e, forming a roughly hexagonal shape in plan view, is repeatedly formed on the outer surface of the roll of the outer sheet 11, with flat portions in between. Referring to Figure 1(b), in this example, each embossed portion 11e of the outer sheet 11 has a dot-like shape that is roughly triangular in plan view. Note that the shape of this embossed pattern and the shape of the embossed portions are illustrative and do not limit the present invention. As the embossed pattern, a dot-like, linear, or combination thereof embossed pattern formed over substantially the entire surface of the sheet can be applied. As the shape of the embossed portion, any shape can be applied, such as a triangle, circle, square, rectangle, rhombus, pentagon, other polygons, or flower shape.

[0027] Referring to Figure 1(c), the two sheets 11 and 12 are integrated by the interposed adhesive G to form an embossed laminated structure. Figures 1(c)(i) and (ii) show examples of forms of the embossed laminated structure that can be used in embodiments of the present invention.

[0028] (Nested embossed layered structure) In one embodiment of this design shown in Figure 1(c)(i), the outer sheet 11 and the inner sheet 12 are joined and integrated via adhesive glue G in such a manner that the embossed protrusions of the embossed portion 11e of the outer sheet 11 fit into the recesses of the non-embossed portion 12ne surrounded by the embossed protrusions of the embossed portion 12e of the inner sheet 12, thereby forming an embossed laminated structure. Such an embossed laminated structure is also referred to as a "nested embossed laminated structure."

[0029] The non-embossed portions 12ne of sheet 12 are not limited in shape, size, distribution, or number, as long as they enable a nested embossed laminated structure. The shape of the non-embossed portions 12ne may be the same as that of the corresponding embossed portions 11e of sheet 11 (in this example, roughly triangular dots in plan view), or it may be a different shape from that of the embossed portions 11e of sheet 11. In order to enable a nested embossed laminated structure, the recesses of the non-embossed portions 12ne of sheet 12 are generally larger than the embossed protrusions of the embossed portions 11e of sheet 11. There may be a gap between the embossed protrusions of the embossed portions 11e and the recesses of the non-embossed portions 12ne that receive them. Multiple protrusions of the embossed portions 11e may be included within a single recess of the non-embossed portions 12ne.

[0030] (Tip to Tip embossed layered structure) In another embodiment of this design shown in Figure 1(c)(ii), the outer sheet 11 and the inner sheet 12 are joined and integrated via adhesive glue G in such a manner that the outer top surface of the embossed protrusions of the embossed portion 11e of the outer sheet 11 and the outer top surface of the embossed protrusions of the embossed portion 12e of the inner sheet 12 are in contact with each other, thereby forming an embossed laminated structure. Such an embossed laminated structure is also referred to as a "Tip to Tip embossed laminated structure".

[0031] In embodiments of the present invention, the embossed laminated structure of the kitchen paper 10 may be a nested embossed laminated structure or a tip-to-tip embossed laminated structure, and there are no restrictions on the form of the embossed laminated structure. Furthermore, the shape, dimensions (area of ​​the top surface, height), and distribution of the multiple embossed portions 11e on the sheet 11 may be uniform or diverse. Similarly, the shape, dimensions (area of ​​the top surface, height), and distribution of the multiple embossed portions 12e on the sheet 12 may be uniform or diverse. For example, the area of ​​the top surface of the embossed protrusions may be 0.62 mm 2 ~1.73mm 2 The height of the top surface of the embossed protrusions is set to 280 μm to 590 μm, and the density of the embossed protrusions is set to 5 protrusions / cm². 2 ~12 pieces / cm 2 It can be done this way.

[0032] In this example, the embossed portion 11e of the outer sheet 11 protrudes toward the inside of the roll. With this configuration, the embossed portion protrudes toward the inside of the roll, resulting in embossed recesses appearing on the surface of the kitchen paper roll 1, which can have the effect of making it feel smooth to the touch. However, this is not essential in the present invention. As one modification, kitchen paper 10 having the nested embossed laminated structure shown in Figure 1(c)(i) may be wound so that sheet 11 becomes the inner sheet of the roll and sheet 12 becomes the outer sheet of the roll to form the kitchen paper roll 1. With this, embossed protrusions appear on the surface of the kitchen paper roll 1, which can have the effect of providing a unique tactile feel and visual pattern.

[0033] (adhesive glue) For the adhesive glue G used to join sheets 11 and 12, known adhesives used in kitchen paper with a laminated structure can be used. For example, polyvinyl alcohol, starch, modified starch, cellulose-based adhesives such as carboxymethylcellulose can be used.

[0034] (Perforations) In an embodiment of the present invention, the kitchen paper 10 has tearing perforations 7 to facilitate the separation of the kitchen paper 10 from the kitchen paper roll 1 after it has been unwound from the kitchen paper roll 1.

[0035] In detail, referring to Figure 1(a), the kitchen paper 10 has tearing perforations 7 consisting of continuous small holes extending in the width direction (CD direction) of the kitchen paper 10, formed at predetermined intervals L along the longitudinal direction (MD direction) of the kitchen paper 10. The small holes are spaces provided by a perforation forming member such as the blade of a cutter, and in these parts, the constituent fibers of the kitchen paper 10 are cut or divided. The small holes can take any shape, for example, they may be linear like slits, dots, or in the shape of a dashed line or a dotted line.

[0036] (Perforation interval) In this specification, this predetermined interval L, that is, the distance L between two adjacent tearing perforations 7, will also be referred to as the "1-cut dimension." Furthermore, the section of kitchen paper 10 sandwiched between two adjacent tearing perforations 7 separated by the 1-cut dimension will also be referred to as the "1-cut."

[0037] The cut size can be arbitrarily set, taking into consideration the amount of paper needed and ease of use when using kitchen paper. The kitchen paper 10 unwound from the kitchen paper roll 1 is easily separated from the kitchen paper roll 1 into any number of cuts, such as one cut or multiple cuts, by tearing along any perforations 7.

[0038] (Paper tube) Referring to Figure 1(d), the paper tube 5 has a cylindrical shape, and kitchen paper 10 is wound around it to form a kitchen paper roll 1. The core diameter DC, which is the outer diameter of the paper tube 5, is set according to the size of the components (core core, hook, etc.) of the kitchen paper roll holder that rotates and supports the kitchen paper roll 1, and is generally about 38 mm to 40 mm.

[0039] (Diameter of kitchen paper roll) Referring to Figure 1(d), the winding diameter of the kitchen paper roll 1 refers to the roll diameter (diameter) DR of the kitchen paper 10 wound into a roll in the form of the kitchen paper roll 1. In the embodiment of the present invention, the winding diameter DR of the kitchen paper roll 1 is set to a size that can be fitted into a general kitchen paper roll holder and rotatably supported. The winding diameter DR of the kitchen paper roll 1 is, for example, 100 mm to 134 mm, and may also be 110 mm to 120 mm. The winding diameter DR can be measured using, for example, a caliper.

[0040] (Length of kitchen paper roll) The length of the kitchen paper roll 1 refers to the length of the kitchen paper 10 wound around the paper tube 5 in the kitchen paper roll 1. In this embodiment of the present invention, the length of the kitchen paper roll 1 is 25m or more and 65m or less.

[0041] When the length of a kitchen paper roll 1 is 25m or more, the length of kitchen paper 10 per roll is long, and when the diameter of the kitchen paper roll 1 is kept within a predetermined size range, it does not take up much space, making it efficient to carry and easy to store. Generally, as the length of the kitchen paper roll 1 increases, the diameter of the kitchen paper roll 1 also increases, and when it exceeds 65m, the kitchen paper roll 1 becomes difficult to fit into a typical kitchen paper roll holder. Also, when the length of the kitchen paper roll 1 is less than 25m, the length of each roll is short, and when the diameter of the kitchen paper roll 1 is kept within a predetermined size, the improvement in the efficiency of carrying and storage of the kitchen paper roll 1 is small.

[0042] The length of a kitchen paper roll can be determined, for example, by measuring the length while unwinding kitchen paper 10 from kitchen paper roll 1.

[0043] (Width of kitchen paper roll / Width of kitchen paper) The width of the kitchen paper roll 1 refers to the length of the kitchen paper roll in the width direction (CD direction) of the kitchen paper 10 wound onto the kitchen paper roll 1. Generally, the width of the kitchen paper roll 1 is equal to the width and length of the kitchen paper 10 wound onto the kitchen paper roll, due to a manufacturing process that includes a step of cutting a wide kitchen paper roll to obtain a kitchen paper roll of the product width. In the embodiment of the present invention, the width of the kitchen paper roll 1 is set to a length that can fit within a general kitchen paper roll holder and be rotatably supported therein. The width of the kitchen paper roll 1, i.e., the width of the kitchen paper 10, may be, for example, 180 mm to 250 mm, and is often around 210 mm. The width can be measured using, for example, calipers or a measuring tape.

[0044] (Basis weight of kitchen paper) The basis weight of the kitchen paper 10 is the weight per square meter obtained by combining the two sheets 11 and 12 that make up the kitchen paper 10 and the adhesive paste G interposed therebetween. The basis weight of the kitchen paper 10 can be obtained by measuring the basis weight in accordance with the provisions of Japanese Industrial Standard JIS P8124.

[0045] In an embodiment of the present invention, the basis weight of the kitchen paper 10 is 32.0 g / m 2 or more and 60.0 g / m 2 or less.

[0046] When the basis weight of the kitchen paper 10 is lower than 32.0 g / m 2 Generally, due to a decrease in the amount of pulp contained, etc., the strength of the kitchen paper 10 becomes low, and the water absorption and oil absorption also decrease, resulting in a poor usability.

[0047] When the basis weight of the kitchen paper 10 is higher than 60.0 g / m 2 Generally, the kitchen paper 10 has a higher paper thickness, and it may become difficult to store the roll diameter of the kitchen paper roll 1 within a predetermined range.

[0048] (Paper thickness of kitchen paper) In this specification, the paper thickness of the kitchen paper 10 is the thickness per set of kitchen paper, and refers to the thickness of the entire two embossed sheets 11 and 12 joined by the intervening adhesive paste G. The paper thickness of the kitchen paper 10 can be obtained, for example, by measuring the thickness with a micrometer having two parallel circular pressing surfaces and sandwiching the kitchen paper 10 between the pressing surfaces in accordance with ISO 12625-3. However, during the measurement of the thickness, the pressure applied between the pressing surfaces shall be 2 kPa ± 0.2 kPa.

[0049] The paper thickness of the kitchen paper 10 according to the embodiment of the present invention is not particularly limited, but as a reference value, for example, it is 300 μm to 600 μm. Within this range of paper thickness, it is possible to sufficiently exhibit the thickness and strength when used as kitchen paper, without becoming excessively bulky, and the desired winding diameter and winding length of the kitchen paper roll 1 can be ensured.

[0050] (Density of kitchen paper rolls) In an embodiment of the present invention, the winding density of the kitchen paper roll 1 is 0.50 m / cm 2 More than 1.10m / cm 2 The following applies:

[0051] In an embodiment of the present invention, the winding density of the kitchen paper roll 1 is calculated by the following formula (I). (Wrap density) = (Wrap length × Number of plies) ÷ (Cross-sectional area of ​​kitchen paper roll) (Equation I)

[0052] The cross-sectional area of ​​the kitchen paper roll 1 corresponds to the area of ​​the portion made up of kitchen paper 10 on the side surface of the kitchen paper roll 1 shown in Figure 1(d). In other words, the cross-sectional area of ​​the kitchen paper roll 1 is the area obtained by subtracting the area of ​​the circle with the core diameter DC of the paper tube 5 as its diameter from the area of ​​the circle with the winding diameter DR as its diameter. The cross-sectional area of ​​the kitchen paper roll 1 is calculated by the following equation (II). (Cross-sectional area) = (Diameter of kitchen paper roll DR ÷ 2) 2 ×3.14 - (Core diameter DC ÷ 2) 2 ×3.14 (Formula II)

[0053] For example, if kitchen paper roll 1 has a length of 34m and a roll diameter DR of 118mm, and the core diameter DC of paper tube 5 is 40mm, then since kitchen paper 10 is 2-ply, the roll density is (34m × 2) ÷ {(118mm ÷ 2)} 2 ×3.14 - (40mm ÷ 2) 2 Calculate {×3.14} and get 0.703 m / cm 2 This is the result.

[0054] The winding density of kitchen paper roll 1 is 0.50 m / cm 2 If the temperature is lower, the diameter of the kitchen paper roll 1 tends to be larger, and the length of the kitchen paper roll 1 may be limited.

[0055] On the other hand, the winding density of kitchen paper roll 1 is 1.10 m / cm 2 If the pressure is higher, the internal pressure on the rolled kitchen paper 10 becomes excessively large, which can cause the embossing on the kitchen paper 10 to be crushed, impairing its soft texture, or cause the kitchen paper 10 to develop a curl, resulting in a greater degree of curl when the kitchen paper 10 is unwound and separated from the kitchen paper roll 1.

[0056] (Geometric mean ply peel strength of kitchen paper) In an embodiment of the present invention, the geometric mean ply peel strength of the kitchen paper 10, which is the ply peel strength in the MD direction and the ply peel strength in the CD direction, is 0.100 N or more and 0.165 N or less.

[0057] When the ply peel strength of kitchen paper 10 in the MD direction is M (unit: N) and the ply peel strength of kitchen paper 10 in the CD direction is C (unit: N), the geometric mean ply peel strength of kitchen paper 10 is given by the formula (M × C). 1 / 2 It can be calculated by (unit: N).

[0058] (Ply peel strength of kitchen paper) The ply peel strength of kitchen paper 10 refers to the strength required to separate the two sheets 11 and 12 that make up the two-ply kitchen paper 10 from each other. The ply peel strength of kitchen paper 10 can be measured in accordance with the measurement of peel-off adhesive strength in JIS Z 0237, for example, by the following method.

[0059] (Method for measuring ply peel strength) Under the standard conditions specified in JIS Z 0237, kitchen paper 10 is cut to prepare two samples: Sample 1, with a length of 300 mm and a width of 24 ± 0.5 mm, with the MD direction of the kitchen paper as the longitudinal direction; and Sample 2, with a length of 300 mm and a width of 24 ± 0.5 mm, with the CD direction of the kitchen paper as the longitudinal direction. Next, the ply peel strength in the MD direction of the kitchen paper is measured using Sample 1, and the ply peel strength in the CD direction of the kitchen paper is measured using Sample 2.

[0060] Specifically, for each sample, which is a 2-ply kitchen paper, one of the two sheets 11 and 12 constituting each sample is attached to the jig plate with double-sided tape. Next, the other sheet, which is not attached to the jig plate, is peeled off from the first sheet by a predetermined length, folded back 180 degrees, and the end of the other sheet is fixed to the upper chuck of a peel test load cell (RTC-1250A, manufactured by A&D Co., Ltd.). Next, the end of the first sheet is fixed together with the jig plate to the lower chuck of the peel test load cell. Finally, the distance between the upper and lower chucks is set to 8 cm.

[0061] Next, both sheets 11 and 12 are pulled vertically at a speed of 5 ± 0.2 mm / second (i.e., the set tensile speed is 300 mm / minute), and the peel strength required to peel both sheets 11 and 12 is measured. After the start of measurement, the measurement taken over the first 10 mm length is treated as noise, and thereafter, the measured values ​​of the ply peel force until the other sheet is peeled over a length of 50 mm are averaged and used as the ply peel strength. In detail, the ply peel strength is measured every 0.001 seconds, and the average value of the measurements taken over a 50 mm ply peel time of 10 seconds (i.e., a total of 10,000 measurement points) is used as the ply peel strength.

[0062] In the measurement of ply peel strength as in Sample 1 above, when the direction in which the sheet is pulled perpendicular to the direction of MD of the kitchen paper 10, the ply peel strength is called the "ply peel strength in the MD direction of the kitchen paper." Also, in the measurement of ply peel strength as in Sample 2 above, when the direction in which the sheet is pulled perpendicular to the direction of CD of the kitchen paper 10, the ply peel strength is called the "ply peel strength in the CD direction of the kitchen paper."

[0063] (Effects and Benefits) A first embodiment of the present invention is a kitchen paper roll 1 in which kitchen paper 10 is wound into a roll shape, having an embossed laminated structure in which two embossed sheets 11 and 12 are integrated via an adhesive glue G, and tearing perforations 7 are formed at predetermined intervals along the longitudinal direction (MD direction), the basis weight of the kitchen paper 10 is 32 g / m² 2 More than 60g / m 2 The following conditions apply: the length of kitchen paper roll 1 is between 25m and 65m, and the winding density of kitchen paper roll 1 is 0.50m / cm². 2 More than 1.10m / cm 2 The following is the case, and the geometric mean ply peel strength of the kitchen paper 10, which is the ply peel strength in the MD direction and the ply peel strength in the CD direction, is 0.100 N or more and 0.165 N or less.

[0064] As a result of diligent research, the inventors have found that there is some correlation between the ply peel strength of the kitchen paper 10 and the degree of curl of the kitchen paper 10 after it has been unwound and separated from the kitchen paper roll 1. Specifically, they have found that in a kitchen paper roll 1 having an embossed laminated structure and perforations 7 for tearing, by setting the basis weight of the kitchen paper 10, the length of the kitchen paper roll 1, and the winding density within the above range, and setting the geometric mean ply strength of the kitchen paper 10 to 0.100 N or more and 0.165 N or less, the degree of curl of the kitchen paper 10 after it has been unwound and separated from the kitchen paper roll 1 can be sufficiently suppressed without any problems.

[0065] If the geometric mean ply strength of the kitchen paper 10 is higher than 0.165N, the degree of curl of the kitchen paper 10 after it is unwound and separated from the kitchen paper roll 1 tends to be greater, making the kitchen paper 10 difficult to use. Also, if the geometric mean ply strength of the kitchen paper 10 is less than 0.100N, when using the kitchen paper 10, for example when wiping up moisture, ply separation is likely to occur between the two sheets 11 and 12 that make up the kitchen paper 10, which can lead to problems such as a decrease in moisture absorption performance.

[0066] If the geometric mean ply peel strength of the kitchen paper 10 is between 0.100N and 0.165N, the degree of curling of the kitchen paper 10 unwound and separated from the kitchen paper roll 1 is sufficiently suppressed without any problems, and a user-friendly kitchen paper roll 1 is obtained in which ply peeling is less likely to occur during use.

[0067] (Example of a method for manufacturing kitchen paper rolls according to the present invention) An example of a manufacturing method for producing a kitchen paper roll 1 according to an embodiment of the present invention will be described. A kitchen paper roll 1, as illustrated in Figure 1, can be manufactured, for example, as follows.

[0068] (Manufacturing of raw material rolls) First, raw material rolls are manufactured in which sheets 11 and 12, which are components of kitchen paper 10, are wound into rolls. Specifically, using a paper machine (not shown), wide (several to more than twenty times the width of kitchen paper roll 1) and long sheets 11 and 12 are made from papermaking slurry (paper stock) and wound up, thereby manufacturing single-ply raw material rolls on which sheets 11 and 12 are wound.

[0069] As paper machines, known paper machines such as twin-wire formers, cylinder formers, suction-pressed formers, and crescent formers can be used.

[0070] A paper machine may be equipped with a creping section for creping. In the creping section, during the raw material roll manufacturing process, while the sheets (webs) being produced are drying, a creping doctor can, if necessary, impart very fine, wavy wrinkles called crepes to the sheets. Crepes can impart softness, bulkiness, moisture absorption, aesthetics (the shape of the crepes), and a good tactile feel to the sheets.

[0071] Furthermore, the paper machine may be equipped with a calendering unit. In the calendering unit, the dried sheets can be subjected to calendering by sandwiching and pressing them from above and below with a pair of calendering rolls, as needed. This compresses the sheets 11 and 12, adjusting and uniformizing the paper thickness, as well as smoothing the surface. The calendering unit may be provided separately from the paper machine, and the calendering process may be performed at any manufacturing step after the raw material roll manufacturing process. The calendering process may also be performed in multiple stages.

[0072] (Manufacturing of kitchen paper rolls) Figure 2 illustrates an example of a manufacturing apparatus that can be used to manufacture a kitchen paper roll 1 according to an embodiment of the present invention, and in particular, is a partially schematic diagram showing an example of an embossed laminated structure forming section applicable to the manufacturing apparatus.

[0073] In the manufacturing apparatus shown in Figure 2, the embossing rolls 14 and 15 are rolls having a raised / recessed portion on their outer surface corresponding to a desired embossing pattern. The outer surfaces of the embossing rolls 14 and 15 have raised / recessed portions that correspond to a desired embossing pattern. At least the raised / recessed portions of the embossing rolls 14 and 15 are made of metal, and the embossing rolls 14 and 15 may be male (convex) steel rolls. The embossing rolls 14 and 15 are rotationally driven by a driving means (not shown).

[0074] The nip rolls 13 and 16 are driven rolls used in contact with the embossing rolls 14 and 15, and have a cylindrical outer shape. The surface portions of the nip rolls 13 and 16 are formed of a hard, rubber-like elastic material such as elastically deformable hard synthetic rubber.

[0075] Referring to Figure 2, the sheet 11, unwound from the raw material roll (not shown), is wrapped around the nip roll 16, passed through the nip between the nip roll 16 and the embossing roll 15, and pressed to impart an emboss that conforms to the shape of the uneven portion on the outer surface of the embossing roll 15.

[0076] Meanwhile, the sheet 12, unwound from the raw material roll (not shown), is wrapped around the nip roll 13, passed through the nip between the nip roll 13 and the embossing roll 14, and pressed to create an emboss that conforms to the shape of the uneven surface of the outer circumferential surface of the embossing roll 14.

[0077] Next, an applicator including a grouper pan 21, a fountain roll 18, a transfer roll 19, and an applicator roll 20 applies adhesive glue G to the top surface of the embossed protrusions on the embossed sheet 11. Specifically, the liquid adhesive glue G contained in the grouper pan 21 adheres to the surface of the rotating fountain roll 18 and is picked up, then transferred to the transfer roll 19 and then the applicator roll 20, and then transferred to the top surface of the embossed protrusions, which are the areas of the sheet 11 that are passed between the applicator roll 20 and the embossing roll 15 and are in contact with the applicator roll 20.

[0078] Next, the embossed sheet 12 and the sheet 11 coated with adhesive G are passed through the nip between the embossing rolls 14 and 15, and then wound onto the marriage roll 17. This joins and integrates the sheets 11 and 12 via the adhesive G, forming a kitchen paper 10 with an embossed laminated structure.

[0079] Here, a nested embossed laminated structure can be obtained by configuring the embossed rolls 14 and 15 such that the protrusions of the uneven surface of the outer circumferential surface of the embossed roll 15 fit into the recesses of the uneven surface of the outer circumferential surface of the embossed roll 14. Alternatively, a tip-to-tip embossed laminated structure can be obtained by configuring the embossed rolls 14 and 15 such that the protrusions of the uneven surface of the outer circumferential surface of the embossed roll 15 face the protrusions of the uneven surface of the outer circumferential surface of the embossed roll 14.

[0080] The kitchen paper 10 is fed downstream while its tension is adjusted by the dancer roll 22, and perforations for tearing are formed by the perforation forming section (not shown).

[0081] The perforation forming unit is, in short, a unit that forms perforations on the sheet that is fed in. The perforation forming unit is configured to form tearing perforations 7 that cross the width direction (CD direction) of the kitchen paper 10 at regular intervals L along the longitudinal direction (MD direction) of the kitchen paper 10. Any known perforation forming means can be used to form the tearing perforations 7.

[0082] The kitchen paper 10, which has perforations for tearing formed on it, is then sent to a winding section (not shown) and wound into a roll around a paper tube 5. The rolled kitchen paper 10 is then cut to a width that matches the product size to obtain a kitchen paper roll 1.

[0083] The manufacturing apparatus and manufacturing method described above are illustrative and do not limit the present invention. Any known manufacturing apparatus and manufacturing method can be used to manufacture kitchen paper rolls according to the present invention.

[0084] (Means of achieving the invention) The papermaking process for producing the raw material rolls may include (1) a pulp blending process, (2) a pulp beating process, (3) a chemical addition process, (5) a dewatering process, and (6) a drying process. By changing the conditions in these processes (for example, the blending ratio of softwood pulp and hardwood pulp, the degree of pulp beating, the type and amount of added chemicals, the papermaking speed, the crepe processing conditions, etc.), the paper quality of the sheets 11 and 12, for example, the strength of the sheets in the MD and CD directions, can be adjusted.

[0085] Furthermore, the paper quality of sheets 11, 12 and kitchen paper 10, such as paper thickness and density, and the winding density of the kitchen paper roll can be adjusted by changing the presence or absence of calendering treatment on sheets 11 and 12, the treatment conditions (pressure, temperature, etc.), the embossing conditions (shape, number, arrangement of embossed areas, emboss height, density, hardness of the embossing roll, pressure, combination of uneven shapes on the outer surface of the embossing roll, etc.), and the tension applied to the kitchen paper during the winding process onto the kitchen paper roll.

[0086] <Second Embodiment> Next, a second embodiment of the present invention will be described. Unless otherwise specified, the configurations applicable to the first embodiment are applicable to this embodiment.

[0087] A second embodiment of the present invention is a preferred embodiment of the first embodiment, characterized in that the predetermined interval L in the longitudinal direction (MD direction) of two adjacent tearing perforations 7, i.e., the cut dimension, is 180 mm or more and 250 mm or less.

[0088] (Effects and Benefits) If the predetermined interval (1-cut dimension) L of the tearing perforations 7 of the kitchen paper 10 is less than 180 mm, or more than 250 mm, the 1-cut dimension of the kitchen paper 10 is either too small or too large, and in either case, the curling effect on the cut kitchen paper 10 is significant, causing the kitchen paper 10 to curl up and making it difficult to use.

[0089] If the predetermined interval (1-cut dimension) L of the tearing perforations 7 of the kitchen paper 10 is 180 mm or more and 250 mm or less, the kitchen paper 10 cut to the 1-cut dimension will have less curling, and the degree of curling will be sufficiently suppressed without any inconvenience, resulting in kitchen paper that is easy to use.

[0090] <Third Embodiment> Next, a third embodiment of the present invention will be described. Unless otherwise specified, the configurations applicable to the first embodiment are applicable to this embodiment.

[0091] A third embodiment of the present invention is a kitchen paper 10 with a density of 0.080 g / cm³. 3 0 .1 30g / cm 3 The following characteristics apply:

[0092] (Density of kitchen paper) In this specification, the density of kitchen paper 10 refers to the density of one set of kitchen paper, and is the density of the entire set of two embossed sheets 11 and 12 joined together by an intervening adhesive G. The density of kitchen paper 10 is calculated, for example, by dividing the basis weight of the kitchen paper by the thickness (i.e., the paper thickness of the kitchen paper) measured by sandwiching the kitchen paper 10 between two parallel circular pressure surfaces of a micrometer, in accordance with ISO 12625-3, to obtain the mass per unit volume (unit: g / cm³). 3 This can be determined by calculating the following. However, the pressure applied between the pressure surfaces during thickness measurement should be 2kPa ± 0.2kPa.

[0093] (Effects and Benefits) The density of kitchen paper 10 is 0.080 g / cm³. 3 If the density is lower than 0.130 g / cm³, the amount of pulp fibers per unit volume decreases, making the kitchen paper 10 more prone to tearing when used for tasks such as wiping up moisture. On the other hand, if the density of the kitchen paper 10 is 0.130 g / cm³, 3If the temperature is higher than this, the paper is more likely to curl, and the degree of curl in the kitchen paper 10 that has been unwound and separated from kitchen paper roll 1 tends to increase.

[0094] The density of kitchen paper 10 is 0.080 g / cm³ or higher. .1 When the density is 30 g / cm³ or less, the amount of pulp fibers per unit volume is within an appropriate range, the degree of curling of the kitchen paper 10 unwound and separated from the kitchen paper roll 1 is sufficiently suppressed without any problems, and the kitchen paper 10 is resistant to tearing (strength) when in use. Furthermore, within this density range, the kitchen paper 10 can exhibit water absorption for moisture, as well as softness and conformability to the wiping surface during wiping operations.

[0095] <Fourth Embodiment> Next, a fourth embodiment of the present invention will be described. Unless otherwise specified, the configurations applicable to the first to third embodiments are applicable to this embodiment.

[0096] A fourth embodiment of the present invention is characterized in that the area of ​​the kitchen paper roll 1 glued with adhesive G is 5% or more and 15% or less.

[0097] (Glue application area ratio) In this specification, the adhesive area ratio refers to the percentage of the total area of ​​regions joined by adhesive glue G within a predetermined area of ​​the kitchen paper 10 (unit: %).

[0098] An example of a method for manufacturing a kitchen paper roll according to an embodiment of the present invention has been described above in the first embodiment. In the embodiment of the present invention, the adhesive glue G is applied by transfer using an applicator to the top surface of the raised portion of the embossed part of one of the two sheets 11 and 12 that constitute the kitchen paper 10, thereby enabling the joining of both sheets 11 and 12 via the adhesive glue G. For example, the total area of ​​the region to which the adhesive glue G is applied can be calculated by considering it to be equivalent to the total area of ​​the top surfaces of the raised portions of the embossed part to which the adhesive glue G should be applied (has been applied).

[0099] For example, for the raised portion of the embossed area to which adhesive G should be applied (or has been applied), the unit area of ​​the top surface (area of ​​the top surface per raised portion, unit: mm) 2 (number of bumps per unit area of ​​kitchen paper, unit: bumps / mm²), and density (number of bumps per unit area of ​​kitchen paper, unit: bumps / mm²). 2 Alternatively, you can calculate the adhesive area ratio from these values.

[0100] Alternatively, the adhesive area ratio may be determined based on measured values ​​obtained through image analysis or other means.

[0101] In Figure 1(a), the region indicated by the symbol Ib represents the smallest unit of the repeatedly formed embossed pattern. The adhesive area ratio may be determined within such a smallest unit of the repeatedly formed embossed pattern. This allows for consideration of the distribution (variation in arrangement) of multiple embossed areas on the kitchen paper 10, preventing the obtained adhesive area from differing depending on the measurement area.

[0102] If the embossed pattern includes embossed areas with different properties (for example, if the shape of the top of the raised area differs, such as a triangle, square, or circle, or if the unit area of ​​the top surface differs due to different sizes), the adhesive area ratio may be determined by grouping the areas, calculating for each group, and adding them together.

[0103] (Effects and Benefits) If the area covered by adhesive is greater than 15%, the degree of curling of the kitchen paper 10 unwound and separated from the kitchen paper roll 1 tends to increase. Also, if the area covered by adhesive is less than 5%, the kitchen paper 10 becomes more prone to tearing or peeling when used for wiping up moisture, etc.

[0104] When the area covered by adhesive glue is in the range of 5% to 15%, the degree of curling of the kitchen paper 10 unwound and separated from the kitchen paper roll 1 is sufficiently suppressed without any problems, and a user-friendly kitchen paper 10 is obtained that is less likely to tear or peel off during use.

[0105] <Fifth Embodiment> Next, a fifth embodiment of the present invention will be described. Unless otherwise specified, the configurations applicable to the first to fourth embodiments are applicable to this embodiment.

[0106] A fifth embodiment of the present invention is characterized in that the embossed laminated structure of the kitchen paper 10 is a nested embossed laminated structure.

[0107] Referring to (i) in (c) of Figure 1, if the embossed laminated structure of the kitchen paper 10 is a nested embossed laminated structure, the columnar portions extending in the embossing height direction (thickness direction) in the embossed protrusions of the embossed portion 11e and the columnar portions extending in the embossing height direction (thickness direction) in the embossed protrusions of the embossed portion 12e support the laminated structure of the sheet 11 and the sheet 12 in a positional relationship that reinforces each other.

[0108] On the other hand, referring to Figure 1(c)(ii), if the embossed laminated structure of the kitchen paper 10 is a Tip-to-Tip embossed laminated structure, the columnar portions are in a linear positional relationship in the height direction, separating sheet 11 and sheet 12, but they are not in a positional relationship that reinforces the laminated structure with each other.

[0109] Therefore, if the embossed laminated structure of kitchen paper 10 is a nested embossed laminated structure, it has a firmer structure and higher absorbency compared to a tip-to-tip embossed laminated structure, and may have the effect of preventing moisture from seeping through to the back when used for wiping up spills, etc. [Examples]

[0110] (Examples 1-7) Following the above-described example of a method for manufacturing a kitchen paper roll according to an embodiment of the present invention, two-ply kitchen paper rolls according to the embodiments of the present invention shown in Tables 1 and 2 were manufactured. The embossed laminated structure was a nested embossed laminated structure.

[0111] In the table, "number of cuts" refers to the number of areas of kitchen paper with a single cut size contained in one roll of kitchen paper, and the following relationship holds true. (Roll length) = (Dimensions per cut) × (Number of cuts)

[0112] The dimensions and number of cuts can be set by the perforation forming means for breaking.

[0113] (Comparative Examples 1-3) Kitchen paper rolls of Comparative Examples 1 to 3, shown in Table 3, were manufactured according to the same method for manufacturing kitchen paper rolls as in the example.

[0114] The following measurements and evaluations were performed on the manufactured kitchen paper rolls of the examples and comparative examples. The measurements were carried out after conditioning the samples in an environment conforming to the Japanese Industrial Standard JIS P8111 (temperature 23±1°C, humidity 50±2%RH).

[0115] <Measurement> [Length of kitchen paper roll [m]] In the perforation forming mechanism for tearing, the dimensions of one cut and the number of cuts were set, and the product of these was calculated to determine the length of the kitchen paper roll.

[0116] [Diameter of kitchen paper roll [mm]] The outer diameter of the kitchen paper roll was measured using calipers and rounded to the nearest whole number.

[0117] [Core diameter of paper tube [mm]] The outer diameter of the paper core of the manufactured kitchen paper roll was measured using calipers and rounded to the nearest whole number.

[0118] [Kitchen paper roll winding density] The winding density of the kitchen paper roll was calculated according to the following equation (I). (Wrap density) = (Wrap length × Number of plies) ÷ (Cross-sectional area of ​​kitchen paper roll) (Equation I)

[0119] The cross-sectional area of ​​a kitchen paper roll is calculated using the following formula (II). (Cross-sectional area) = (Diameter of kitchen paper roll DR ÷ 2) 2 ×3.14 - (Core diameter DC ÷ 2) 2 ×3.14 (Formula II)

[0120] [Basis weight of kitchen paper [g / m²] 2 ] The basis weight of a set of kitchen paper, consisting of two sheets and the adhesive between them, was measured according to the provisions of the Japanese Industrial Standard JIS P8124 after unwinding the kitchen paper from the roll.

[0121] [Thickness of kitchen paper [μm]] The paper thickness of a set of kitchen paper, consisting of two sheets and the adhesive between them, was measured according to ISO 12625-3 after unwinding the kitchen paper from the roll. However, the pressure applied between the pressure surfaces during measurement was set to 2 kPa ± 0.2 kPa.

[0122] [Density of kitchen paper [g / cm³] 3 ] The basis weight of a set of kitchen paper, consisting of two sheets and the adhesive between them, is calculated by unwinding the kitchen paper from the roll and dividing it by the paper thickness of the set of kitchen paper, as measured according to ISO 12625-3, to obtain the mass per unit volume (unit: g / cm³). 3 The thickness was determined by calculating the following. However, the pressure applied between the pressure surfaces during the thickness measurement was set to 2kPa ± 0.2kPa.

[0123] [Glue application area ratio [%]] The adhesive area ratio was determined based on measured values ​​obtained through image analysis.

[0124] [Ply peel strength [N]] In the description of the first embodiment, the ply peel strength M in the MD direction and the ply peel strength C in the CD direction of the kitchen paper were measured for each sample in accordance with the measurement of peel adhesion strength of JIS Z 0237 (method for measuring ply peel strength). Furthermore, from these measured values, the formula (M × C) was used. 1 / 2 The geometric mean ply peel strength of kitchen paper was calculated using this method.

[0125] <Rating> Sensory evaluation was conducted on the following items, and the results are indicated by symbols.

[0126] [Degree of curl] After adjusting the humidity of the kitchen paper roll in accordance with JIS P8111, the kitchen paper was unrolled from the roll, and the 50th cut from the innermost part was detached from the roll. The degree of curl in one cut was then measured. The degree of curl was evaluated by placing the kitchen paper on a measuring platform with the front and back sides facing up so that the four corners of the kitchen paper stood up within 30 seconds of unrolling, measuring the height of the four corners of the kitchen paper from the measuring platform after 5 minutes, and evaluating the average value of the height of the four corners of the kitchen paper and the degree of curl. ◎: The average height of the four corners is less than 45mm. ○: The average height of the four corners is 45mm or more but less than 55mm. △: The average height of the four corners is 55mm or more, or it is curled inward and cannot be measured. ×: cylindrical

[0127] [Ply peeling] Kitchen paper was unrolled from a roll and cut into single-cut lengths. Each single-cut piece of kitchen paper was then manually peeled apart, separating the two sheets that make up the two-ply structure, and evaluated based on its peelability. ○: The resistance during peeling was high, making it difficult to peel off. △: The resistance during peeling was not very high, and it peeled off with moderate resistance. ×: Low resistance during peeling, easily removed.

[0128] <Test Results> Tables 1 through 3 show the test results.

[0129] [Table 1]

[0130] [Table 2]

[0131] [Table 3]

[0132] As shown in Tables 1 to 3, all of the samples from Example 1 to Comparative Example 3 (all samples) were kitchen paper rolls in which kitchen paper having a nested embossed structure, in which two embossed sheets were integrated via an adhesive, was wound into a roll.

[0133] The kitchen paper rolls in Examples 1 to 7 all have a basis weight of 32 g / m². 2 More than 60g / m2 The following conditions must be met: the length of the kitchen paper roll must be between 25m and 65m, and the winding density must be 0.50m / cm². 2 More than 1.10m / cm 2 The following results were obtained: the geometric mean ply peel strength of the kitchen paper in the MD direction and the CD direction was between 0.100N and 0.165N, and the degree of curling was either ◎, ○, or △, indicating that it was sufficiently suppressed without any problems. Furthermore, ply peeling was ○ or △, indicating that it did not peel off easily and was in good condition.

[0134] Comparative Examples 1 and 2 had the same basis weight, roll length, and winding density as Examples 1 to 5, and also had the same cut dimensions, number of cuts, roll diameter, and core outer diameter. However, in Comparative Example 1, the geometric mean ply peel strength was outside the range of the present invention (below the lower limit), and although the degree of curling was sufficiently suppressed without any problems, the ply peeling was inferior, as the resistance during peeling was low and it peeled off easily. Furthermore, in Comparative Example 2, the geometric mean ply peel strength was outside the range of the present invention (exceeding the upper limit). While the ply peeling was good and did not peel off easily, the degree of curling was so strong that it curled into a cylindrical shape, which was inferior.

[0135] Comparative Example 3 differed from Examples 1 to 5 in the winding density of the kitchen paper roll, falling outside the scope of the present invention (exceeding the upper limit), and also had a lower density of kitchen paper than the examples. While Comparative Example 3 showed good resistance to ply peeling, as it did not peel easily, its degree of curling was inferior, as it curled so strongly that it became cylindrical. [Explanation of symbols]

[0136] 1 kitchen paper roll 5 Paper tube 7 perforations 10 kitchen paper 11, 12 sheets 11e, 12e Embossed section 11ne, 12ne non-embossed area

Claims

1. A kitchen paper roll in which kitchen paper is wound into a roll shape, having an embossed laminated structure in which two sheets, each with an embossed surface, are integrated together via adhesive, and perforations for tearing are formed at predetermined intervals along the longitudinal direction, The basis weight of the aforementioned kitchen paper is 32 g / m². 2 60g / m or more 2 The following: The length of the aforementioned kitchen paper roll is between 25m and 65m. The winding density of the aforementioned kitchen paper roll is 0.703 m / cm². 2 0.992m / cm or more 2 The following: The geometric mean ply peel strength of the kitchen paper, calculated as the ply peel strength in the MD direction and the ply peel strength in the CD direction, is 0.100 N or more and 0.161 N or less. The ply peel strength was determined in accordance with the measurement of peel-off adhesive strength in JIS Z 0237, using a sample with a length of 300 mm and a width of 24 ± 0.5 mm. Two sheets constituting the sample were pulled perpendicularly apart at a set tensile speed of 300 mm / min with a chuck spacing of 8 cm, and the measurement value for the first 10 mm was treated as noise, and the average measurement value of the ply peel strength until 50 mm was peeled was obtained. The ply peel strength in the MD direction was measured using a sample of the kitchen paper with the MD direction as the longitudinal direction, and the ply peel strength in the CD direction was measured using a sample of the kitchen paper with the CD direction as the longitudinal direction.

2. The kitchen paper roll according to claim 1, characterized in that the predetermined interval between the perforations for tearing is 180 mm or more and 250 mm or less.

3. The density of the aforementioned kitchen paper is 0.080 g / cm³. 3 0.130g / cm or more 3 The kitchen paper roll according to claim 1 or 2, characterized in that it is as follows:

4. The kitchen paper roll according to any one of claims 1 to 3, characterized in that the area covered by the adhesive is 5% or more and 15% or less.

5. The kitchen paper roll according to any one of claims 1 to 4, characterized in that the embossed laminated structure is a nested embossed laminated structure.

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