Paper towel package

Abstract

To provide a paper towel package in which two rolls of bulky, water-absorbent, high-quality paper towel roll products are packaged, which makes it easy to open the perforations when opening, prevents the perforations from being opened erroneously under an unintended situation, and further maintains the softness of the roll products and the water-absorbency of the paper towels when the roll products are taken out of the package.SOLUTION: A paper towel package in which at least a side surface of the paper towel package, among its top, bottom, and side surfaces, has a perforation for opening along an axial direction of one of the roll products. This paper towel package is characterized in that the tensile strength of the perforations is 2.3 N / 50 mm or more and 25.0 N / 50 mm or less, the winding softness of the roll product is 1.2 mm or more and 4.0 mm or less, and the water absorption per unit area of the paper towel is 330 g / m2 or more and 600 g / m2 or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] FIELD OF THE DISCLOSURE The present disclosure relates to paper towel packages. [Background technology]

[0002] 2. Description of the Related Art Roll product packages in which a plurality of roll products are packaged in a film are often provided with perforations for opening.

[0003] For example, Patent Document 1 discloses a package in which multiple roll products are wrapped in film, and by specifying the position and dimensions of perforations for opening, it is possible to easily form an opening that makes it easy to remove the roll products.

[0004] Furthermore, Patent Document 2 discloses a package in which multiple roll products are wrapped in film, and the material of the packaging bag has the property of being torn linearly in one direction, and furthermore, a linear cut (notch) is formed that extends in the same direction as this direction, making the package easy to open.

[0005] In film packaging bags containing multiple roll products, valleys form between the rolls, creating a taut film, making them easier to open by providing perforations along the axial direction of the roll products. However, if there are perforations in the valleys, stress is placed on the perforated area when lifting the bag by hand, which can lead to unintentional opening. In particular, in the case of a package containing two roll products wrapped in film, if there are perforations in the valleys of the film packaging bag, fingers can easily get caught in the perforated area no matter which direction the package is held from, making it easy to accidentally open the bag.

[0006] Therefore, if the strength of the perforations is increased in order to prevent unintentional opening, it may become difficult to open. Also, if the thickness of the film is too thin, it may lead to accidental opening of the perforations, and if it is too thick, it may become difficult to open.

[0007] Furthermore, Patent Document 3 discloses a package in which one roll product is caramel-wrapped in a resin film, which has heat-sealed adhesive sections on the top and bottom in a predetermined pattern and perforations for opening in the width direction (axial direction) of the roll product from the top to the bottom, making it easy to remove the roll product and preventing it from tearing in unintended circumstances such as when dropped.

[0008] However, when perforations are provided along the axial direction of the roll product rather than in the valleys between rolls, if the roll softness of the packaged roll product is too hard, fingers slip when opening the product, making it difficult to transmit force to the perforations, making it difficult to open the perforations. On the other hand, if the roll product is bulky and soft, fingers dig into the roll, making it easy for the roll to be crushed, making it easy to open incorrectly. Furthermore, while increasing the strength of the perforations can prevent incorrect opening, the perforations become difficult to open, so applying force to the fingers can crush the roll or sheet, resulting in problems such as the bulk and absorbency not being able to be maintained. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-054717 [Patent Document 2] Patent Publication No. 2017-178431 [Patent Document 3] Japanese Patent Application Publication No. 2022-131679 Summary of the Invention [Problem to be solved by the invention]

[0010] The present invention has been made in view of the above circumstances, and aims to provide a paper towel package in which two rolls of bulky, highly absorbent, high-quality paper towel roll products are packaged, which allows easy opening of the perforations when opening, prevents accidental opening of the perforations under unintended circumstances, and further allows the roll products to maintain their softness when removed from the package, and the absorbency of the paper towels. [Means for solving the problem]

[0011] The inventors have conducted extensive research and have found that the above problems can be solved by specifying the position and tensile strength of the opening perforation in the paper towel package, the winding softness of the roll product, the water absorption capacity of the paper towels, etc., in a paper towel package in which two roll products made of wound paper towels are caramel-wrapped in a resin film, and have thus completed the present invention.

[0012] (1) A first aspect of the present invention is a paper towel package in which two roll products, each of which is a roll of paper towels, are wrapped in a resin film and caramel-wrapped, and at least one of the top, bottom, and side surfaces of the paper towel package has a perforation for opening the roll product in the axial direction along one of the roll products, the perforation having a tensile strength of 2.3 N / 50 mm or more and 25.0 N / 50 mm or less, the roll product having a rolling softness of 1.2 mm or more and 4.0 mm or less, and the water absorption per unit area of ​​the paper towel is 330 g / m 2 More than 600g / m 2 A paper towel package characterized in that:

[0013] (2) A second aspect of the present invention is the paper towel package according to (1), wherein the basis weight of the product ply of the paper towel is 30 g / m 2 More than 56g / m 2 It is characterized by the following:

[0014] (3) A third aspect of the present invention is a paper towel package according to (1) or (2), characterized in that the thickness of the paper towels is 2.0 mm / 10 plies or more and 4.5 mm / 10 plies or less.

[0015] (4) A fourth aspect of the present invention is the paper towel package according to (1) or (2), wherein the specific volume of the paper towel is 12 cm 3 / g or more 18cm 3 / g or less.

[0016] (5) A fifth aspect of the present invention is the paper towel packaging according to (1) or (2), characterized in that the rolled product has a roll length of 20 m or more and 50 m or less.

[0017] (6) A sixth aspect of the present invention is the paper towel packaging according to (1) or (2), characterized in that the roll diameter of the roll product is 125 mm or more and 175 mm or less.

[0018] (7) A seventh aspect of the present invention is the paper towel package according to (1) or (2), characterized in that the circumference is 650 mm or more and 950 mm or less.

[0019] (8) The eighth aspect of the present invention is a paper towel packaging according to (1) or (2), characterized in that the roll mass of the roll product per 280 mm width, excluding the core, is 190 g or more and 620 g or less.

[0020] (9) A ninth aspect of the present invention is the paper towel package according to (1) or (2), wherein the winding density of the roll product is 0.15 m / cm 2 More than 0.60m / cm 2 It is characterized by the following:

[0021] (10) A tenth aspect of the present invention is the paper towel package according to (1) or (2), wherein the roll density of the roll product is 0.03 g / cm 3 More than 0.20g / cm 3 It is characterized by the following:

[0022] (11) The eleventh aspect of the present invention is a paper towel packaging body as described in (1), characterized in that the perforations are arranged in an alternating pattern of non-perforated portions and perforated portions, and the length of each non-perforated portion is 0.2 mm or more and 5.0 mm or less.

[0023] (12) The twelfth aspect of the present invention is the paper towel packaging described in (11), characterized in that the length of each of the perforated cuts is 0.5 mm or more and 4.5 mm or less.

[0024] (13) The thirteenth aspect of the present invention is a paper towel package according to (11) or (12), characterized in that the bond ratio of the perforation (total length of the non-perforation cut portions / (total length of the non-perforation cut portions + total length of the perforation cut portions) x 100) is 6% or more and 60% or less. [Effects of the Invention]

[0025] According to the present invention, a paper towel package can be provided in which two rolls of bulky, highly absorbent, high-quality paper towel roll products are packaged, the perforations are easy to open when opening, the perforations can be prevented from being accidentally opened under unintended circumstances, and the roll products maintain their softness and absorbency when removed from the package. [Brief explanation of the drawings]

[0026] [Figure 1] 1 is a perspective view of a paper towel package according to one embodiment of the present invention. FIG. [Figure 2] FIG. 1 is a perspective view of a roll of paper towels. [Figure 3] 1 is a schematic plan view showing the relationship between the heat-sealed portion and the perforations on the top surface (or bottom surface) of the paper towel package. FIG. [Figure 4] FIG. [Figure 5] FIG. 1 is a diagram showing an example of an embossed pattern on a paper towel. [Figure 6] FIG. 1 is a diagram showing a method for measuring the water absorption of a paper towel. [Figure 7] FIG. 1 is a diagram showing a part of a paper towel manufacturing process. DETAILED DESCRIPTION OF THE INVENTION

[0027] Hereinafter, one embodiment of the present invention will be described in detail. However, the following embodiment is presented for illustrative purposes, and the present invention is not limited to the embodiment shown below.

[0028] In this specification, the term "paper towel package" (hereinafter simply referred to as "package") means a roll product in which paper towels are wound into a roll and packaged in a resin film.

[0029] The "MD direction" refers to the direction in which the paper towel runs through the machine, and the "CD direction" refers to the direction perpendicular to the MD direction. In this specification, the "MD direction of the roll product" refers to the direction in which the paper towel is wound (the Y direction in FIG. 2), and the "CD direction of the roll product" refers to the direction perpendicular to the direction in which the paper towel is wound (the X direction in FIG. 2). Furthermore, as shown in FIG. 1, when the roll product 20 is inserted axially into a cylindrical resin film and both axial ends of the roll product are heat-sealed, the "MD direction of the resin film" is the X direction in FIG. 1, and the "CD direction of the resin film" is the Y direction in FIG. 1. Packaging may be performed so that the MD and CD directions of the resin film are reversed.

[0030] In this specification, "axial direction" means the axial direction of the roll product, which is the same as the CD direction of the roll product, and is the X direction in FIGS.

[0031] In this specification, "mis-opening under unintended circumstances" means that the perforation opens unexpectedly during processing, transportation, dropping, or handling of the package.

[0032] <Paper towel packaging> As shown in FIG. 1, the paper towel package 10 of the present invention is formed by wrapping two rolls of roll product 20, each roll of paper towel 20a shown in FIG.

[0033] The details of each component are as follows:

[0034] <Paper towels> The paper towel 20a can be made into the roll product 20 by layering base paper after a papermaking process, embossing the base paper as needed, and then winding the base paper into a roll. Alternatively, the base paper may be embossed before being layered and wound into a roll.

[0035] Paper towel 20a is preferably manufactured by a TAD (through-air drying) papermaking method, which is a method of drying by ventilation (preferably without press-dehydrating wet paper) during the dehydration and drying step of the papermaking process. By manufacturing paper towel 20a by the TAD papermaking method, it is possible to obtain paper towel 20a that is bulky, soft, and has excellent water absorbency.

[0036] The paper towel 20a is preferably a sheet having two or more embossed plies. The number of plies of the paper towel 20a is more preferably two to three, and even more preferably two. By forming the embossed paper towel 20a and stacking it in two or more plies, the roll product 20 has elasticity, making it easier to hook a finger when opening the package 10. Furthermore, it is preferable that the embossed ply is provided only on one ply on the surface side of the roll.

[0037] (paper thickness) The paper thickness per 10 plies of paper towel 20a (hereinafter simply referred to as "paper thickness of paper towel 20a") is preferably 2.0 mm / 10 plies or more and 4.5 mm / 10 plies or less. If the paper thickness of paper towel 20a is less than 2.0 mm / 10 plies, the absorbency will be poor, and if it exceeds 4.5 mm / 10 plies, the roll will be too stiff, making the package 10 difficult to open. The lower limit of the paper thickness of paper towel 20a is more preferably 2.3 mm / 10 plies or more, and even more preferably 2.6 mm / 10 plies or more. The upper limit is more preferably 3.8 mm / 10 plies or less, and even more preferably 3.3 mm / 10 plies or less.

[0038] The paper thickness was measured using the following method. A thickness gauge (a dial thickness gauge called "PEACOCK" manufactured by Ozaki Seisakusho Co., Ltd.) was used. The measurement conditions were a measurement load of 3.7 kPa and a probe diameter of 30 mm. The sample was placed between the probe and the measuring table, and the gauge reading was taken when the probe was lowered at a speed of 1 mm per second or less. To measure the paper thickness per 10 plies, 10 plies (five sets of two-ply sheets) were stacked and measured, and the measurement results were averaged. For a three-ply sheet, nine plies (three sets of three-ply sheets) were stacked and measured, and the thickness per ply was calculated from the measurement results and converted to 10 plies. The paper thickness was measured at five different points in the MD direction (Y direction in Figure 2) of the sheet, and five points shifted from these five points in the CD direction (X direction in Figure 2), for a total of 10 points. It is important to measure the paper thickness at 10 different points, but the exact position is not important.

[0039] (Basic weight) The basis weight of the product ply of the paper towel 20a is 30 g / m 2 More than 56g / m 2 The following is preferred: The basis weight of the product ply of the paper towel 20a is 30 g / m 2 If it is less than 56g / m, the absorbency is poor. 2 If the weight exceeds 100g / m², the roll becomes too hard and the package becomes difficult to open. 2 More preferably, 38 g / m2 More preferably, the upper limit is 53 g / m 2 Less than 48g / m is more preferable. 2 The following is more preferable: The basis weight is measured in accordance with JIS P 8124.

[0040] (specific volume) The specific volume of paper towel 20a is 12cm 3 / g or more 18cm 3 / g or less. 3 If it is less than 18cm / g, the absorbency is poor. 3 If the specific volume of the paper towel 20a exceeds 13 cm / g, the roll becomes too hard and it becomes difficult to open the package 10. 3 / g or more is more preferable, and 14cm 3 / g or more is more preferable. The upper limit is 17 cm 3 / g or less is more preferable, and 16cm 3 The specific volume of the paper towel 20a is calculated by dividing the paper thickness of a predetermined number of plies (for example, product plies) of the paper towel 20a by the basis weight of the predetermined number of plies, and is expressed as a volume cm per unit g. 3 It is expressed as:

[0041] (Water absorption) The water absorption per unit area of ​​the paper towel 20a is 330 g / m 2 More than 600g / m 2 The water absorption capacity of the paper towel 20a is 330 g / m 2 If it is less than 600g / m, the absorbency will be poor. 2 If the temperature exceeds 100°C, the rolled product 20 becomes too hard to open, making it difficult to open the package 10. The lower limit of the amount of water absorption per unit area is 350 g / m 2 More than 380g / m 2 More preferably, the upper limit is 550 g / m 2 Preferably less than 500 g / m 2 The following is even more preferred:

[0042] The amount of water absorbed by the paper towel 20a in a dry state is measured in accordance with the following method. First, two plies of paper towel 20a are taken and cut using a square template with each piece measuring 7.6 cm (3 inches) to prepare a rectangular test piece 200 (see FIG. 6) with each side measuring 7.6 cm. The mass of the test piece 200 before water absorption is measured using an electronic balance. The test piece 200 is set in a holder 220 (a jig that fixes three points of the test piece 200, and the jig is made of a metal that does not absorb water).

[0043] Next, distilled water is poured into a commercially available tray to a depth of 2 cm, and the test piece 200 set in the holder 220 is immersed in the distilled water for 2 minutes. After immersion for 2 minutes, the test piece 200 and holder 220 are removed from the distilled water, and as shown in FIG. 6, a strip 210 is attached to one corner 200d of the test piece 200. The strip 210 is made by peeling off one ply of paper towel 20a, the same as the two plies of paper towel to be measured, and cutting this one ply of paper towel into a size of 2 mm x 15 mm. This ply is then attached to the test piece 200, 6 mm from the corner 200d toward the center. Next, the holder 220 and test piece 200 are hung from a rod placed in an empty water tank with the corner 200a opposite the corner 200d facing up, and the tank lid is closed and left for 15 minutes.

[0044] Thereafter, the holder 220 and the test piece 200 are taken out of the water tank, the band 210 and the holder 220 are removed, and the mass of the test piece 200 is measured using an electronic balance. From the change in mass of the test piece 200 before and after immersion in distilled water, the amount of distilled water absorbed per unit area of ​​the test piece 200 (g of water / sheet m 2 , 1m 2 Per. Abbreviated as g / m 2 The measurement is carried out five times for each sample, and the average value is used.

[0045] For three-ply paper towels, it is preferable to measure using the same procedure as for two-ply. This measurement is performed according to JIS P 8111 at a temperature of 23±1°C and humidity of 50±2%. The distilled water is kept at 23±1°C.

[0046] (Embossed area ratio) The embossed area ratio of the paper towel 20a (hereinafter simply referred to as the "embossed area ratio") is preferably 8% or more and 22% or less. If the embossed area ratio is less than 8%, the paper towel 20a is smooth and difficult to catch fingers on, making the package 10 difficult to open. If the embossed area ratio exceeds 22%, the paper towel 20a is crushed, making the roll product 20 less flexible and making the package 10 difficult to open. In other words, by setting the embossed area ratio within the above range, even if pressure from the resin film 30 or adjacent roll products 20 is applied to the paper towel 20a, the embossing is less likely to be crushed, and the absorbency and softness of the paper towel 20a can be maintained. The lower limit of the embossed area ratio is more preferably 9% or more, and even more preferably 10% or more. The upper limit is more preferably 18% or less, and even more preferably 16% or less.

[0047] The embossed area ratio is determined by measuring the surface side of the paper towel 20a (the outer surface of the roll) that corresponds to the top 10% of the roll product 20 with a ruler or tape measure, measuring the area, and converting it into a ratio per unit area (area ratio). When the embossing is difficult to see with the naked eye or when the embossing width is narrow, it is preferable to measure the area using a microscope VR-3000 (manufactured by Keyence Corporation). The top 10% of the roll product 20 refers to the outermost 10% of the roll product 20 (the portion closest to the roll surface). For example, if the roll length of the roll product 20 is 30 m, this refers to the first 3 m of use.

[0048] The above area ratio is determined by measuring the total length of embossments that are 0.1 mm to 4 mm thick and 5 mm or longer inside a rectangle E that includes all of one embossing pattern, as shown in Figure 5, and then calculating the embossment area as "total length (mm) x width (mm)." The area per sheet of paper towel 20a is calculated as "sheet length x sheet width," and then calculating "(embossed area / area per sheet of paper towel 20a) x 100" (%). Note that if it is difficult to determine the embossed area ratio, the area ratio of the convex portions of the embossing roll used in embossing can be considered to be the area per sheet of paper towel 20a.

[0049] The size of one side of this rectangle E can be changed as appropriate depending on the size of the embossed pattern. Furthermore, if the rectangle that contains all of the embossed patterns contains an embossed pattern adjacent to an embossed pattern contained within the rectangle, the length of the adjacent embossed pattern is also measured and included in the total length. If the size of one side of rectangle E cannot be clearly determined depending on the embossed pattern, the size of rectangle E is set to 10 cm x 10 cm, and the total length of the embossments contained within this rectangle E is measured. The total length is determined using the method described above.

[0050] <Roll products> As shown in Fig. 2, the roll product 20 of this embodiment is a paper towel 20a wound into a roll. The roll product 20 has a core 21, such as a cylindrical paper core or a cylindrical space, in the center, with the outer diameter (winding diameter) of the roll product 20 being DR and the outer diameter of the core 21 being DI. Of the two surfaces of the paper towel 20a, the surface facing the outside of the roll product 20 is referred to as the front surface 22 of the paper towel 20a, and the surface facing the core 21 of the roll product 20 is referred to as the back surface 23 of the paper towel 20a. Preferably, the paper towel 20a has easy-to-tear portions (not shown) such as perforations at predetermined intervals so that it can be cut to a predetermined length.

[0051] (core) The core 21 is located at the center of the roll product 20. The core 21 may be a cylindrical cardboard tube or a cylindrical space. In this embodiment, the core 21 of the roll product 20 has a cylindrical cardboard tube made of multiple layers of base paper, and the paper towel 20a is wound around the cardboard tube. In the following description, the core 21 refers to the core 21 that is a cylindrical cardboard tube unless otherwise specified.

[0052] The core 21 preferably contains LBKP (bleached hardwood kraft pulp) as the pulp fiber contained in the base paper. That is, the core 21 preferably contains LBKP. The LBKP content is preferably 50% by mass or more, more preferably 70% by mass or more, and even more preferably 90% by mass or more. By including LBKP in the core 21, the product has a luxurious feel.

[0053] (Core outer diameter (DI)) The outer diameter (DI in FIG. 2) of the core 21 (hereinafter also referred to as the "core outer diameter DI") is preferably 28 mm or more and 58 mm or less. If the core outer diameter DI is less than 28 mm, the winding diameter (outer diameter) DR (hereinafter also simply referred to as the "winding diameter DR") of the roll product 20 becomes too small, making the package 10 less tight and difficult to open. On the other hand, if the core outer diameter DI exceeds 58 mm, the winding diameter DR of the roll product 20 becomes too large, making the package 10 more tight and prone to unintentional opening. The lower limit of the core outer diameter DI is more preferably 32 mm or more, and even more preferably 36 mm or more. The upper limit is more preferably 52 mm or less, and even more preferably 48 mm or less.

[0054] The core outer diameter DI is measured, for example, using a diameter rule (manufactured by Muratec KDS Co., Ltd.). Two roll products 20 are measured and the measurement results are averaged. In the case of a roll product 20 without a core, the diameter of the cylindrical space (center hole) at the center of the roll product 20 is considered to be the core outer diameter DI.

[0055] (core mass) The mass of the core 21 (hereinafter also referred to as "core mass") is preferably 10 g or more and 25 g or less. If the core mass is less than 10 g, the diameter of the core 21 becomes small, and the winding diameter DR of the roll product 20 becomes too small, making the package 10 less tight and difficult to open. On the other hand, if the core mass exceeds 25 g, the diameter of the core 21 becomes large, and the winding diameter DR of the roll product 20 becomes too large, making the package 10 less tight and more likely to be opened unintentionally. The lower limit of the core mass is more preferably 12 g or more, and even more preferably 13 g or more. The upper limit is more preferably 22 g or less, and even more preferably 19 g or less. The core mass is defined as the mass per 280 mm of roll width W. If the roll width W is not 280 mm, it is converted to the mass per 280 mm by proportional calculation. The roll width W refers to the axial length of the roll product 20 (see FIG. 2).

[0056] (Apparent basis weight of core) The apparent basis weight of the core 21 (the basis weight of the core made up of multiple layers of base paper) is 280 g / m 2 More than 530g / m 2 The core 21 preferably has an apparent basis weight of 280 g / m 2 If the apparent basis weight of the core 21 is less than 530 g / m, the core 21 will be easily crushed, making it difficult to open the package 10. 2 If the apparent basis weight of the core 21 exceeds 330 g / m, the core 21 becomes hard, and after the roll product 20 is used up, it is difficult to fold (crush) the core 21 and discard it, which makes the roll product 20 less user-friendly. 2 More preferably, 380 g / m 2 More preferably, the upper limit is 480 g / m 2 Less than 430 g / m is more preferable. 2 The following is more preferable: The apparent basis weight of the core 21 is measured in accordance with JIS P 8124.

[0057] (Reel diameter (DR)) The roll diameter (DR in FIG. 2) (hereinafter also referred to as "roll diameter DR") of the roll product 20 is preferably 125 mm or more and 175 mm or less. If the roll diameter DR is less than 125 mm, the roll diameter DR of the roll product 20 becomes too small, making the package 10 less tight and difficult to open. On the other hand, if the roll diameter DR exceeds 175 mm, the roll diameter DR of the roll product 20 becomes too large, making the package 10 more tight and prone to unintentional erroneous opening. The lower limit of the above range of the roll diameter DR is more preferably 135 mm or more, and even more preferably 145 mm or more. The upper limit is more preferably 170 mm or less, and even more preferably 165 mm or less.

[0058] (Volume length) The winding length of the roll product 20 (hereinafter simply referred to as "winding length") is preferably 20 m or more and 50 m or less. If the winding length is shorter than 20 m, the winding diameter DR of the roll product 20 becomes too small, making the package 10 less tight and difficult to open. On the other hand, if the winding length exceeds 50 m, the winding diameter DR of the roll product 20 becomes too large, making the package 10 more tight and prone to unintentional erroneous opening. The lower limit of the winding length is more preferably 23 m or more, and even more preferably 25 m or more. The upper limit is more preferably 47 m or less, and even more preferably 43 m or less.

[0059] (Roll width (W)) The roll width (W in FIG. 2) of the roll product 20 (hereinafter also referred to as "roll width W") is preferably 200 mm or more and 400 mm or less. If the roll width W is less than 200 mm, the package 10 will not be tight enough and will be difficult to open. On the other hand, if the roll width W exceeds 400 mm, the package 10 will be too tight and will be prone to unintentional opening. The lower limit of the roll width W is more preferably 230 mm or more, and even more preferably 250 mm or more. The upper limit is more preferably 350 mm or less, and even more preferably 300 mm or less. The "roll width W" refers to the length of the roll product 20 in the axial direction.

[0060] (winding density) The winding density of the roll product 20 (hereinafter also simply referred to as "winding density") is 0.15 m / cm2 More than 0.60m / cm 2 The winding density is preferably 0.15 m / cm or less. 2 If the winding density is less than 0.60 m / cm, the roll product 20 becomes too soft, which can lead to unintentional opening of the package 10. 2 If the winding density exceeds 0.25 m / cm, the roll product 20 becomes too hard, making it difficult to open the package 10. 2 More preferably, 0.29 m / cm or more 2 The upper limit is preferably 0.55 m / cm. 2 Less than 0.50m / cm is more preferable. 2 The following is even more preferred:

[0061] The winding density can be calculated using the following formula (1). Winding density = (winding length × number of plies) ÷ (cross-sectional area of ​​roll product 20) (1) The cross-sectional area of ​​the roll material 20 can be calculated by the following formula (2). Cross-sectional area of ​​the rolled product 20=(cross-sectional area of ​​the rolled product 20 at the winding diameter DR)−(cross-sectional area of ​​the core outer diameter DI) (2) For example, in the case of a winding length of 20 m, 2 plies, winding diameter (DR) of 154 mm, and core outer diameter (DI) of 44 mm, winding density = (20 m × 2) ÷ {3.14 × (154 mm ÷ 2 ÷ 10)} 2 -3.14×(44mm÷2÷10) 2}=0.23m / cm 2 This becomes:

[0062] (Rolling softness) The winding softness of the roll product 20 (hereinafter simply referred to as "winding softness") is 1.2 mm or more and 4.0 mm or less. If the winding softness is less than 1.2 mm, the roll product 20 becomes too hard, making it difficult to open the package 10. On the other hand, if the winding softness exceeds 4.0 mm, the roll product 20 becomes too soft, causing the package 10 to be unintentionally opened by mistake. The lower limit of the winding softness is preferably 1.4 mm or more, and more preferably 1.6 mm or more. The upper limit is preferably 3.6 mm or less, and more preferably 3.0 mm or less.

[0063] Here, the roll softness means the softness of the roll product 20 when held in the hand, and can be evaluated by the following method.

[0064] The winding softness of the roll material 20 is measured using a compression tester (handy compression tester KES-G5 manufactured by Kato Tech Co., Ltd.) as follows: The direction parallel to the axial direction of the roll material 20 is defined as the height direction, and the direction perpendicular to the tangent to the circumference of the roll material 20 is defined as the radial direction.

[0065] First, the roll material 20 is placed horizontally on the table of the testing machine so that the axial direction of the roll material 20 is horizontal. Then, the KES-G5 compression tool (contact area 2.0 cm) is placed at the center of the axial direction of the roll material 20. 2 ) is pressed from above in the radial direction at a speed of 10 mm / min. The pressure with which the compressing element presses the roll is 5 gf / cm 2 The indentation depth when the pressure is 150gf / cm 2 The indentation depth at this time is T m As, (T m Next, the roll product 20 is rotated 90 degrees in the circumferential direction around its axis as the axis of rotation, and the pressing depth T m and T0 are measured, and T m and T0 (T m -T0) is calculated. Measurement is performed twice (at two angles) for one roll product 20 as described above. That is, for two roll products 20, measurement is performed twice for each, and the average of the measurement results for a total of four times (=2 times / piece x 2 pieces) is used as the final winding softness.

[0066] (Roll mass <with core>) The roll mass of the roll product 20 including the core 21 (cardboard tube) per 280 mm roll width W (hereinafter simply referred to as "roll mass (with core)") is preferably 200 g or more and 630 g or less. If the roll mass (with core) is less than 200 g, the reel diameter DR becomes too small, the package 10 becomes less tight, and the package 10 becomes difficult to open. If the roll mass (with core) exceeds 630 g, the reel diameter DR becomes too large, the package 10 becomes too tight, and the package 10 may be opened unintentionally. The lower limit of the roll mass (with core) is more preferably 250 g or more, and more preferably 300 g or more. The upper limit is more preferably 580 g or less, and even more preferably 420 g or less.

[0067] (Roll mass <without core>) The roll mass of the roll product 20 per 280 mm roll width W, excluding the core 21 (paper tube) (hereinafter simply referred to as "roll mass <without core>"), is preferably 190 g or more and 620 g or less. If the roll mass <without core> is less than 190 g, the winding diameter DR becomes too small, the package 10 becomes less tight, and the package 10 becomes difficult to open. If the roll mass <without core> exceeds 620 g, the winding diameter DR becomes too large, the package 10 becomes too tight, and the package 10 may be unintentionally opened by mistake. The lower limit of the roll mass <without core> is more preferably 240 g or more, and even more preferably 290 g or more. The upper limit is more preferably 570 g or less, and even more preferably 410 g or less.

[0068] (roll density) The roll density of the roll product 20 (hereinafter also simply referred to as "roll density") is 0.03 g / cm 3 More than 0.20g / cm 3 It is preferable that the roll density is 0.03 g / cm or less. 3 If the roll density is less than 0.20 g / cm, the roll product 20 becomes too soft, which can lead to unintentional opening of the package 10. 3 If the density exceeds 0.05 g / cm, the roll product 20 becomes too hard, making it difficult to open the package 10. The lower limit of the roll density is 0.05 g / cm. 3More preferably, 0.06 g / cm or more 3 The upper limit is 0.15 g / cm. 3 Less than 0.10 g / cm is more preferable. 3 The following is even more preferred:

[0069] The roll density of the roll product 20 can be calculated by (roll mass of the roll product 20 <without core>) / (volume of the roll product 20), and is obtained from the following formula (3). Roll density = roll mass ÷ [{(cross-sectional area of ​​reel diameter DR (outer diameter) part) - (cross-sectional area of ​​core outer diameter DI part)} × roll width W] (3) For example, if the roll mass (without core) per roll width W280 mm is 237 g, the reel diameter (DR) is 154 mm, and the core outer diameter (DI) is 44 mm, then the roll density = 237 g ÷ {(3.14 × (154 mm ÷ 2 ÷ 10) 2 -3.14×(44mm÷2÷10) 2 )×(280mm÷10)}=0.05g / cm 3 The roll width W is calculated based on 280 mm.

[0070] <Paper towel packaging> As shown in FIG. 1, the paper towel package 10 is made by caramel-wrapping two roll products 20 in a resin film 30 so that both axial (X-direction) end surfaces of the roll products 20 face the top surface 11 and bottom surface 12 of the package 10, respectively.

[0071] (Number of rolls) Two roll products 20 are packed in the package 10. If there is one roll, it will be overpackaged, and if there are three or more rolls, the weight of the package 10 will be too heavy and it will be easy to open it by mistake.

[0072] <Resin film> The resin film (hereinafter, also simply referred to as "film") 30 for packaging the roll product 20 may be formed as a single layer or a multi-layer. The material of the film 30 is preferably a thermoplastic resin suitable for recycling. Specifically, for example, thermoplastic resins such as polyolefin (such as polyethylene and polypropylene), polyester (such as PET), polyamide (such as nylon), polycarbonate, polystyrene, and polyvinyl chloride can be mentioned. Among these, from the viewpoint of fully exerting the effects of the present embodiment, a polyethylene film is preferable.

[0073] (Film thickness) The thickness of the resin film 30 is preferably 18 μm or more and 52 μm or less. When the thickness of the film 30 is less than 18 μm, the resin film 30 is likely to be accidentally opened during packaging processing or when the package 10 is held by hand. On the other hand, when the thickness of the film 30 exceeds 52 μm, it becomes difficult to open the perforation 15. The lower limit value of the thickness of the film 30 is more preferably 21 μm or more, and even more preferably 25 μm or more. The upper limit value is more preferably 45 μm or less, and even more preferably 35 μm or less. The thickness of the resin film 30 can be measured in accordance with JIS K 7130.

[0074] (Tensile strength of film <MD direction>) The tensile strength of the resin film 30 in the MD direction is preferably 13 N / 15 mm or more and 32 N / 15 mm or less. When the tensile strength of the film 30 in the MD direction is less than 13 N / 15 mm, the strength of the resin film 30 becomes weak, and when the package 10 is held by hand, fingers are likely to sink in and an unintended accidental opening may occur. On the other hand, when the tensile strength of the film in the MD direction of the film 30 exceeds 32 N / 15 mm, the strength of the resin film 30 is too strong and there is stiffness, so it is difficult to open the package 10. The lower limit value of the tensile strength of the film 30 in the MD direction is more preferably 从以下方面考虑,树脂薄膜30的拉伸强度在MD方向上的下限值更优选为16N / 15mm以上,甚至更优选为18N / 15mm以上。上限值更优选为29N / 15mm以下,甚至更优选为27N / 15mm以下。树脂薄膜30的拉伸强度可根据JIS K 7127进行测量。

[0075] (Tensile strength of the film <CD direction>) The tensile strength of the resin film 30 in the CD direction is preferably 11 N / 15 mm or more and 30 N / 15 mm or less. When the tensile strength of the film 30 in the CD direction is less than 11 N / 15 mm, the strength of the resin film 30 becomes weak, and when the package 10 is held by hand, fingers are likely to dig in and unintentional unsealing may occur. On the other hand, when the tensile strength of the film 30 in the CD direction exceeds 30 N / 15 mm, the strength of the resin film 30 is too strong and has stiffness, making it difficult to open the package 10. The lower limit value of the tensile strength of the film 30 in the CD direction is more preferably 14 N / 15 mm or more, and even more preferably 16 N / 15 mm or more. The upper limit value is more preferably 27 N / 15 mm or less, and even more preferably 25 N / 15 mm or less. The tensile strength of the resin film 30 can be measured in accordance with JIS K 7127.

[0076] (Caramel packaging) Two rolls of roll products 20 are caramel-packaged with the above-mentioned resin film 30 in a state where their axial directions are parallel to each other and arranged in parallel. Caramel packaging is well-known.

[0077] For example, on the sheet-like film 30, a plurality of roll products 20 are placed so that their axial directions are parallel to each other, and in that state, the film 30 is wound around the circumferential surface of the roll product 20 to form a cylindrical shape, and the portions where both ends of the film 30 overlap on the circumferential surface of the roll product 20 are heat-sealed and adhered (not shown) along the axial direction (X direction).

[0078] Alternatively, from the lower side of the set sheet-like film 30, a plurality of roll products 20 arranged so that their axial directions are parallel to each other are raised up to the sheet surface (lower surface side) of the film 30. In that state, the film 30 is wound around the circumferential surface of the roll product 20 to form a cylindrical shape, and the portions where both ends of the film 30 overlap on the circumferential surface of the roll product 20 are heat-sealed and adhered (not shown) along the axial direction (X direction).

[0079] Alternatively, a plurality of roll products 20 are arranged so that their axial directions are parallel to one another and inserted in the axial direction (X direction) from one end of the opening of a film 30 that has been formed into a cylindrical shape in advance.

[0080] Then, of the film 30 protruding from both ends of the multiple roll products 20, two opposing flap-shaped sides are folded toward each other, and then another two opposing flap-shaped sides are similarly folded toward each other, and these folded portions are sealed by heat sealing or the like. The area sealed by this heat sealing becomes the heat-sealed adhesive portion 14 shown by hatching in Figures 1 and 3.

[0081] (heat seal) As shown in Fig. 3, the top surface 11 and bottom surface 12 of the paper towel package 10 have a caramel packaging surface, and furthermore, the top surface 11 is provided with a heat-sealed adhesive portion 14 having a predetermined pattern. It is preferable that the heat-sealed adhesive portion 14 is also provided on the bottom surface 12 of the package 10. Note that the pattern of the heat-sealed adhesive portion 14 is not limited to the linear pattern shown in Figs. 1 and 3, and may be a grid, a plane, a wavy line, or any other pattern that allows the top surface 11 and bottom surface 12 to be adhered.

[0082] (Circumference of packaging) The circumferential length of the packaging body 10 is preferably 650 mm or more and 950 mm or less. If the circumferential length is less than 650 mm, the tightness is reduced and the resin film 30 of the packaging body 10 is left over, making it difficult to open the perforations 15. If the circumferential length exceeds 950 mm, the packaging body 10 becomes too tight, and the weight of the roll product 20 becomes heavy, causing the packaging body 10 to be unintentionally opened by mistake. The lower limit of the circumferential length of the packaging body 10 is more preferably 700 mm or more, and even more preferably 750 mm or more. The upper limit is more preferably 900 mm or less, and even more preferably 850 mm or less. The circumferential length of the packaging body 10 refers to the outer periphery of the top surface 11 (or bottom surface 12) of the packaging body 10 shown in Figure 3.

[0083] The circumferential length of the package 10 can be measured as follows: The package 10 is placed on a table with the axial direction of the roll product 20 oriented vertically, as shown in Figure 1. Then, using a measuring tape (a diameter rule manufactured by Muratec KDS Co., Ltd.), the outer circumferences of the top surface 11, bottom surface 12, and center of the package 10 in the X-axis direction are measured, and the average of these measurements is taken as the circumferential length.

[0084] (perforation) The packaging body 10 is provided with perforations 15 for opening to remove the roll products 20. The perforations 15 are provided on at least the side surface 13 of the top surface 11, bottom surface 12, and side surfaces 13 of the packaging body 10, along the axial direction of one of the roll products 20. For example, as shown in FIGS. 1 and 3, the perforations 15 are provided from the top surface 11 to the bottom surface 12 of the packaging body 10, via the side surfaces 13, along the axial direction of the roll products 20. In FIG. 1, the perforations 15 are provided on the resin film where the left roll product 20 is located, but they may also be provided on the resin film where the right roll product 20 is located. Furthermore, the perforations 15 are preferably provided parallel to the axial direction of the roll product 20 (the X direction in FIG. 1), but may also be provided obliquely relative to the axial direction.

[0085] In this way, the perforations 15 for opening are provided along the axial direction of the roll product 20. This reduces the load on the perforations 15 when the package 10 is lifted by hand, unlike when the perforations are provided in the valleys between multiple roll products 20, and prevents the perforations 15 from unintentionally opening. In this embodiment, the perforations 15 are provided on the top surface 11, bottom surface 12, and side surface 13, but it is sufficient that they are provided on at least the side surface 13. Furthermore, when the perforations 15 are provided on the side surface 13, the perforations 15 may be provided from top to bottom of the side surface 13, or may be provided in the middle portion of the side surface 13.

[0086] (Perforation configuration) As shown in Fig. 4, the perforation 15 of this embodiment is formed by alternating linear arrangement of perforated cutout portions 15a that penetrate the resin film 30 constituting the package 10 in the thickness direction and non-perforated cutout portions 15b where the resin film 30 remains intact. The non-perforated cutout portions 15b are areas sandwiched between the perforated cutout portions 15a on both sides. The arrangement of the perforated cutout portions 15a and the non-perforated cutout portions 15b in the perforation 15 may be curved, but is preferably linear.

[0087] (Length of perforation cut) The length L1 of one of the cut portions 15a of the perforation 15 (hereinafter simply referred to as "cut portions") is preferably 0.5 mm or more and 4.5 mm or less. If the length L1 of the cut portion 15a is less than 0.5 mm, the strength of the perforation 15 is too strong, making it difficult to open the package 10. If the length L1 of the cut portion 15a exceeds 4.5 mm, the strength of the perforation 15 is weakened, causing the package 10 to be unintentionally opened by mistake. The lower limit of the length L1 of the cut portion 15a is more preferably 0.7 mm or more, and even more preferably 1.0 mm or more. The upper limit is more preferably 3.5 mm or less, and even more preferably 2.5 mm or less.

[0088] (length of uncut part of perforation) The length L2 of one of the non-cut portions 15b of the perforation 15 (hereinafter simply referred to as "non-cut portion") is preferably 0.2 mm or more and 5.0 mm or less. If the length L2 of the non-cut portion 15b is less than 0.2 mm, the strength of the perforation 15 will be weak, and the package 10 will be easily opened. If the length L2 of the non-cut portion 15b is more than 5.0 mm, the strength of the perforation 15 will be too strong, making it difficult to open the package 10. The lower limit of the length L2 of the non-cut portion 15b is more preferably 0.3 mm or more, and even more preferably 0.5 mm or more. The upper limit is more preferably 2.0 mm or less, and even more preferably 1.0 mm or less.

[0089] (Perforation bond rate) The bond ratio of the perforation 15 is preferably 6% or more and 60% or less. If the bond ratio of the perforation 15 is less than 6%, the strength of the perforation 15 will be weak, and the package 10 will be easily opened. On the other hand, if the bond ratio of the perforation 15 is more than 60%, the strength of the perforation 15 will be too strong, making the package 10 difficult to open. The lower limit of the bond ratio of the perforation 15 is more preferably 10% or more, and even more preferably 20% or more. The upper limit is more preferably 40% or less, and even more preferably 35% or less.

[0090] The bond ratio of the perforation 15 is calculated by first calculating the total length of the non-cut portions 15b (the sum of L2). Next, the total length of the cut portions 15a (the sum of L1) and the total length of the non-cut portions 15b (the sum of L2) are added together to calculate (L3). Then, the bond ratio is calculated by dividing (the sum of L2) by (L3). Perforation bond rate = (total of L2) ÷ (L3) × 100 L3 = (sum of L1 + sum of L2)

[0091] (tensile strength of perforation) The tensile strength of the perforation 15 is 2.3 N / 50 mm or more and 25.0 N / 50 mm or less. If the tensile strength of the perforation 15 is less than 2.3 N / 50 mm, the strength of the perforation 15 will be weak, and the package 10 will be prone to unintentional erroneous opening. On the other hand, if the tensile strength of the perforation 15 exceeds 25.0 N / 50 mm, the strength of the perforation 15 will be too strong, making the package 10 difficult to open. The lower limit of the tensile strength of the perforation 15 is preferably 3.5 N / 50 mm or more, and more preferably 4.0 N / 50 mm. The upper limit is preferably 20.0 N / 50 mm or less, and even more preferably 15.0 N / 50 mm or less.

[0092] The tensile strength of the perforation 15 can be measured, for example, using a Tensilon universal testing machine STB-1225S (manufactured by A&D Co., Ltd.) according to a method conforming to JIS P 8113. The width direction of the test piece (the direction perpendicular to the tensile direction of the Tensilon universal testing machine) is 50 mm, the distance between the grippers is 100 mm, the tensile speed is 300 mm / min, the measurement temperature is 23°C, the relative humidity is 50%, and the tensile direction is perpendicular to the perforation 15. The tensile strength is measured multiple times (for example, four times), and the average value is taken as the tensile strength of the perforation 15.

[0093] (Embossed area ratio / perforation tensile strength) The value obtained by dividing the embossed area ratio by the tensile strength of the perforations 15 is preferably 0.15 or more and 3.00 or less. If this value is less than 0.15, the paper towel 20a will be smooth and will not easily catch fingers, and the strength of the perforations 15 will be too strong, making it difficult to open the package 10. On the other hand, if this value exceeds 3.00, the roll product 20 will be too stiff and the strength of the perforations 15 will be too weak, causing the package 10 to be unintentionally opened by mistake. The lower limit of this value is more preferably 0.30 or more, and even more preferably 0.50 or more. The upper limit is more preferably 2.50 or less, and even more preferably 2.00 or less.

[0094] (Rolling softness / perforation tensile strength) The value obtained by dividing the above-mentioned winding flexibility by the tensile strength of the perforations 15 is preferably 0.8 or more and 15.0 or less. If this value is less than 0.8, it is difficult for fingers to catch on the roll product 20, and the strength of the perforations 15 is too strong, making it difficult to open the package 10. On the other hand, if this value exceeds 15.0, the winding flexibility of the roll product 20 becomes hard, and the strength of the perforations 15 is weak, causing the package 10 to be unintentionally opened by mistake. The lower limit of this value is more preferably 1.5 or more, and even more preferably 2.5 or more. The upper limit is more preferably 10.0 or less, and even more preferably 7.0 or less.

[0095] (Manufacturing methods for paper towels and roll products) The paper towel 20a and roll product 20 according to this embodiment can be manufactured, for example, in the following order: (1) papermaking and creping, (2) embossing and adhesive treatment, and (3) roll winding. Note that TAD papermaking technology is preferably used in the manufacturing (papermaking) process of the paper towel 20a.

[0096] In the papermaking process (1), it is preferable that a concave-convex pattern derived from the papermaking process (fabric), different from the embossed pattern described above, is applied to paper towel 20a. By providing this concave-convex pattern, the water absorption capacity of paper towel 20a can be further increased.

[0097] "Derived from the papermaking process" means that, during the papermaking process of the paper towel 20a, a concave-convex pattern is imparted between the head box 41 of the papermaking machine and the outlet of the Yankee dryer 46. Specifically, in a portion of the papermaking process shown in FIG. 7, pulp slurry 40a is sprayed (supplied) from the head box 41 between the first fabric (forming fabric) 42 and the second fabric (concave-convex fabric) 43, and is drawn onto the second fabric (concave-convex fabric) 43 by the forming roll 44, forming a wet paper web 40b. Next, the wet paper web 40b is dried together with the second fabric (concave-convex fabric) 43 in a through-air dryer 45, resulting in the formation of concave-convex patterns in the dried sheet 40c. Note that, although two through-air dryers 45 are installed in FIG. 7, a single unit may be used. Also, although a Yankee hood is depicted on the Yankee dryer 46, the hood may be omitted. Crepe may be imparted in the Yankee dryer 46.

[0098] Although the present invention has been described above based on the above embodiment, the present invention is not limited to the content of the above embodiment and can be modified as appropriate without departing from the scope of the present invention. In other words, all other embodiments, examples, operational techniques, etc. made by those skilled in the art based on this embodiment are naturally included in the scope of the present invention. [Example]

[0099] The present embodiment will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to the following examples.

[0100] (Examples 1 to 13, Comparative Examples 1 to 6) For Examples 1 to 13 and Comparative Examples 1 to 6, paper towels and roll products were produced by the above-mentioned method under the conditions shown in Tables 1 and 2, and two roll products were caramel-wrapped to produce paper towel packages. Each paper towel package was then evaluated in the following four ways.

[0101] (Ease of opening perforations) A sensory evaluation was conducted by 20 panelists on the "ease of opening the perforation." Each panelist held an unopened paper towel package with both hands, centered on the perforation on the side, and tried to open the perforation by tearing it open to the left and right with the thumbs of both hands. They were asked to select "easy to open" or "difficult to open," and were rated according to the following criteria: ◎: "Easy to open" - 18 or more people ○: "Easy to open": 15 to 17 people △: "Easy to open": 12 to 14 people ×: "Easy to open": 0 to 13 people

[0102] (Difficulty in accidentally opening) The "resistance to accidental opening" was evaluated based on the resistance to accidental tearing of the perforations (accidental opening) during processing, transportation, dropping, etc. Unopened paper towel packages were placed vertically in the axial direction (X direction), and 12 packages were packed side by side in a cardboard box. The box was then vibrated 50 cm up and down and left and right at one round trip per second for one minute. The packages were then removed from the cardboard box, and the perforations were visually inspected for accidental opening. This test was repeated 10 times, and a total of 120 packages were evaluated according to the following criteria. The inner dimensions of the cardboard box were: long side: diameter of roll product x 2 (roll / package) x 3 (package); short side: diameter of roll product x 4 (package). (judgment formula) Mis-opening rate (%) = (number of packages in which mis-opening occurred) ÷ (120 packages evaluated) × 100 ◎: The rate of mis-opening is less than 1% Good: The rate of mis-opening is between 1% and 3% △: The rate of mis-opening is between 3% and 5% ×: The rate of mis-opening is 5% or more

[0103] (Water absorption) Regarding "water absorption," the water absorption of paper towels removed from a paper towel package was evaluated. Specifically, an unopened paper towel package was held with both hands around the perforation on the side, and the perforation was opened by tearing it open to the left and right with the thumbs of both hands. The roll product was then removed, and the water absorption per unit area of ​​the paper towel was measured using the above-mentioned method for measuring "water absorption," and the evaluation was based on the following criteria. ◎: Water absorption per unit area is 380g / m 2 End 〇: Water absorption per unit area is 350g / m 2 More than 380g / m 2 less than △: Water absorption per unit area is 330g / m 2 More than 350g / m 2 less than ×: Water absorption per unit area is 330g / m 2 less than

[0104] (Rolling softness) Regarding "roll softness," the roll product removed from the paper towel package was evaluated for its roll softness. Specifically, an unopened paper towel package was held with both hands around the perforation on the side, and the perforation was opened by tearing it open to the left and right with the thumbs of both hands. The roll product was then removed and the softness of the roll product was measured using the above-mentioned method for measuring "roll softness," and evaluated according to the following criteria. ◎: Roll softness is 1.6mm or more ○: Roll softness is 1.4mm or more and less than 1.6mm △: Roll softness is 1.2mm or more and less than 1.4mm ×: Roll softness is less than 1.2 mm

[0105] The results obtained are shown in Tables 1 and 2.

[0106] [Table 1]

[0107] [Table 2]

[0108] As is clear from the results shown in Tables 1 and 2, the packages of Examples 1 to 13 were all excellent in ease of opening the perforation, resistance to accidental opening, water absorbency, and softness of the roll product. In contrast, the packages of Comparative Examples 1 to 6 were all inferior in any of ease of opening the perforation, resistance to accidental opening, water absorbency, and softness of the roll product.

[0109] From the above, according to the present disclosure, it has been confirmed that in a package containing two rolls of bulky, highly absorbent, high-quality paper towel roll products, the perforations are easy to open when opening, accidental opening of the perforations under unintended circumstances can be prevented, and the softness of the roll products and the absorbency of the paper towels can be maintained when removed from the package. [Explanation of symbols]

[0110] 10: Paper towel packaging 11: Top 12: Bottom 13: Side 14: Heat seal adhesive part 15: Perforation 15a: Perforated cut section 15b: Non-perforated section 20: Roll products 20a: Paper towels 21: Core 22: Paper towel surface 23: Back of paper towel 30: Resin film 40a: Pulp slurry 40b: Wet paper 40c: dry sheet 41: Head box 42: First fabric (forming fabric) 43: Second fabric (textured fabric) 44: Forming roll 45:Through air dryer 46: Yankee Dryer 200: Test piece 210: Obi 220: Holder

Claims

1. A paper towel package in which two rolls of paper towels are wound into a roll shape and wrapped in a resin film. At least one of the top, bottom, and side surfaces of the paper towel package has a perforation for opening along the axial direction of the roll product along one of the roll products, The tensile strength of the perforation is 2.3 N / 50 mm or more and 25.0 N / 50 mm or less, The winding softness of the roll product is 1.2 mm or more and 4.0 mm or less, The water absorption capacity per unit area of ​​the paper towel is 330 g / m ２ More than 600g / m ２ is A paper towel package characterized by:

2. The basis weight of the paper towel product ply is 30 g / m ２ 56g / m or more ２ 2. The paper towel package of claim 1, wherein:

3. 3. The paper towel package according to claim 1, wherein the thickness of the paper towels is 2.0 mm / 10 plies or more and 4.5 mm / 10 plies or less.

4. The specific volume of the paper towel is 12 cm ３ / g or more 18cm ３ 3. The paper towel package according to claim 1, wherein the moisture content is 0.1% or less.

5. 3. The paper towel package according to claim 1, wherein the roll product has a roll length of 20 m or more and 50 m or less.

6. 3. The paper towel package according to claim 1, wherein the roll product has a winding diameter of 125 mm or more and 175 mm or less.

7. 3. The paper towel package according to claim 1, wherein the circumference is 650 mm or more and 950 mm or less.

8. 3. The paper towel package according to claim 1, wherein the roll mass per 280 mm width of the roll product, excluding the core, is 190 g or more and 620 g or less.

9. The winding density of the roll product is 0.15 m / cm ２ 0.60m / cm or more ２ 3. The paper towel package of claim 1, wherein:

10. The roll density of the roll product is 0.03 g / cm ３ 0.20g / cm or more ３ 3. The paper towel package of claim 1, wherein:

11. The paper towel package of claim 1, characterized in that the perforations are arranged in an alternating pattern of non-perforated sections and perforated sections, and the length of each non-perforated section is 0.2 mm or more and 5.0 mm or less.

12. 12. The paper towel package according to claim 11, wherein the length of each of the perforations is 0.5 mm to 4.5 mm.

13. The paper towel package of claim 11 or 12, characterized in that the bond rate of the perforation (total length of the non-perforation cut portions / (total length of the non-perforation cut portions + total length of the perforation cut portions) x 100) is 6% or more and 60% or less.

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