Paper towel packaging

Abstract

To provide a paper towel package that can maintain water absorbency, softness of the roll, and decorativeness of the package even when the paper towel is soft and high quality TAD, and can prevent the roll from being crushed or damaged due to friction within the package. The paper towel package is made by arranging three rolls of paper towels wound into a roll and wrapping them in a resin film. The diameter of the roll products is 125 mm or more and 175 mm or less, and the roll density is 0.04 g / cm. 3 More than 0.16g / cm 3 The above problem is solved by a paper towel package characterized in that the winding softness is 1.2 mm or more and 4.0 mm or less, and the ratio (= circumference A / circumference B) of the "perimeter of the paper towel package (perimeter A)" to the "perimeter of three rolls of roll products lined up (perimeter B)" when the roll product is removed from the paper towel package is 0.94 or more and 1.40 or less.

Description

[Technical Field]

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

[0002] In recent years, various types of paper towels have been developed.

[0003] Among these, the so-called TAD (Through Air Dryer) papermaking technology, which uses air drying, can produce base paper with high water absorbency and soft texture, making the resulting base paper excellent for use as base paper for paper towel rolls. For example, Patent Document 1 discloses a paper towel roll produced using the TAD papermaking technology, which maintains good texture and water absorption and prevents wrinkles and roll deformation.

[0004] On the other hand, compact packaging of roll products such as paper towels is preferable from the standpoint of storage space and transportation efficiency. For example, Patent Document 2 discloses a package including a paper base material for packaging multiple rolls of sanitary tissue paper.

[0005] However, bulky and soft roll products tend to expand if they are not tightly wrapped, and will not fit into cardboard boxes or pallets. While tight wrapping allows the rolls to be packed compactly, it also creates problems such as the rolls being crushed, making it difficult to maintain quality, and the film being more likely to tear.

[0006] Therefore, if the packaging is loose, the rolls will not be crushed and quality can be maintained, but this will reduce the aesthetic appeal of the packaging and cause the rolls inside to move more easily, resulting in problems such as rubbing against each other and being crushed or damaged. Products made with TAD papermaking technology are particularly susceptible to damage due to the uneven surface of the base paper. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2022-008568 [Patent Document 2] Japanese Patent Application Publication No. 2023-176285 Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention was made in consideration of the above circumstances, and aims to provide a paper towel package that can maintain the water absorbency, softness of the roll, and aesthetic appeal of the package, even for soft, high-quality TAD paper towels, and can prevent the rolls from rubbing against each other inside the package and causing crushing or damage. [Means for solving the problem]

[0009] The inventors conducted extensive research and discovered that the above-mentioned problems can be solved by specifying the roll diameter, roll density, and winding softness of the roll products, as well as the rate of change in the circumferential length of the roll products before and after opening of the package, in a paper towel package in which three roll products made of wound paper towels are lined up and caramel-wrapped in a resin film, and thus completed the present invention.

[0010] (1) A first aspect of the present invention is a paper towel package in which three rolls of paper towels wound into a roll are arranged and caramel-wrapped in a resin film, and the roll diameter of the roll product is 125 mm or more and 175 mm or less, and the roll density is 0.04 g / cm 3 More than 0.16g / cm 3 Hereinafter, this refers to a paper towel package characterized by having a roll softness of 1.2 mm or more and 4.0 mm or less, and a ratio (= circumference A / circumference B) of the "perimeter of the paper towel package (perimeter A)" to the "perimeter of three rolls of the roll product lined up (perimeter B)" when the roll product is removed from the paper towel package, of 0.94 or more and 1.40 or less.

[0011] (2) A second aspect of the present invention is the paper towel package according to (1), wherein the basis weight of the resin film is 18 g / m 2 More than 45g / m 2 It is characterized by the following:

[0012] (3) A third aspect of the present invention is the paper towel package according to (1) or (2), wherein the water absorption per unit area of ​​the paper towel is 300 g / m 2 More than 600g / m 2 It is characterized by the following:

[0013] (4) A fourth aspect of the present invention is a paper towel package according to (1) or (2), characterized in that the paper thickness per 10 plies of the paper towels is 2.0 mm or more and 5.0 mm or less.

[0014] (5) A fifth aspect of the present invention is the paper towel package according to (1) or (2), wherein the winding density of the roll product is 0.20 m / cm 2 More than 0.60m / cm 2 It is characterized by the following:

[0015] (6) A sixth aspect of the present invention is the paper towel package according to (1) or (2), wherein the basis weight of the product ply of the paper towel is 33 g / m 2 More than 65g / m 2 It is characterized by the following:

[0016] (7) A seventh aspect of the present invention is a paper towel package according to (1) or (2), characterized in that the water absorption per unit mass of the paper towel is 7.0 g / g or more and 13.0 g / g or less.

[0017] (8) The eighth 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 18 m or more and 50 m or less.

[0018] (9) A ninth aspect of the present invention is a paper towel package according to (1) or (2), characterized in that the paper towels are wound around a core, and the outer diameter of the core is 28 mm or more and 58 mm or less.

[0019] (10) A tenth aspect of the present invention is the paper towel packaging according to (9), characterized in that the base paper used for the core contains LBKP (hardwood bleached kraft pulp).

[0020] (11) The eleventh aspect of the present invention is the paper towel package according to (1) or (2), characterized in that the paper towel has a linear embossed pattern.

[0021] (12) The twelfth aspect of the present invention is a paper towel package according to (1) or (2), characterized in that the root mean square height of the surface roughness on the uneven surface of the paper towel is 35 μm or more and 170 μm or less. [Effects of the Invention]

[0022] According to the present invention, it is possible to provide a paper towel package that can maintain the absorbency, softness of the roll, and aesthetic appeal of the package, even for soft, high-quality TAD paper towels, and can prevent the rolls from rubbing against each other inside the package. [Brief explanation of the drawings]

[0023] [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] FIG. 2 is a schematic plan view showing a heat-sealed portion on the top surface (or bottom surface) of the paper towel package. [Figure 4] FIG. 1 is a diagram showing a method for measuring the water absorption of a paper towel. [Figure 5] FIG. 1 is a diagram showing a height profile on the XY plane as observed by a microscope using shading. [Figure 6] FIG. 1 is a diagram showing an example of an embossed pattern on a paper towel. [Figure 7] FIG. 1 is a diagram showing a part of a paper towel manufacturing process. DETAILED DESCRIPTION OF THE INVENTION

[0024] 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.

[0025] 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.

[0026] "MD" refers to the direction in which the paper runs through the machine, and "CD" refers to the direction perpendicular to the MD. In this specification, "MD of the roll product" refers to the direction in which the paper towel is wound (Y direction in Figure 2), and "CD of the roll product" refers to the direction perpendicular to the direction in which the paper towel is wound (X direction in Figure 2).

[0027] Furthermore, as shown in Figure 1, when roll products are arranged parallel to each other in the axial direction and a resin film sheet is wrapped around the periphery of the roll product and heat-sealed, the "MD direction of the resin film" is the X direction in Figure 1, and the "CD direction of the resin film" is the Y direction in Figure 1. Packaging may also be performed with the MD and CD directions of the resin film reversed.

[0028] 1 and 2. The term "axial direction" means the axial direction of the roll product, which is the same as the CD direction of the roll product, and corresponds to the X direction in FIGS.

[0029] In this specification, the term "product ply" refers to a paper towel in which the number of plies is in a product state, without peeling off the stacked plies into a single sheet.

[0030] <Paper towel packaging> As shown in FIG. 1, the paper towel package 10 of the present invention (hereinafter simply referred to as "package 10") is three rolls of roll product 20 (see FIG. 2) made by winding up paper towels 20a in a roll shape, caramel-wrapped in resin film 30.

[0031] The details of each component are as follows:

[0032] <Paper towels> The paper towel 20a can be made into the roll product 20 by layering base papers after a papermaking process, embossing them as needed, and then winding them into a roll. Alternatively, the base papers may be embossed before being layered and wound into a roll.

[0033] 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.

[0034] (Number of plies) 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 pattern on the paper towel 20a and stacking it in two or more plies, the paper towel 20a becomes bulky and has good water absorption. Furthermore, the embossed pattern 25 is preferably provided on only one ply on the roll surface side.

[0035] (paper thickness) The paper thickness per 10 plies of the paper towels 20a (hereinafter simply referred to as "paper thickness") is preferably 2.0 mm or more and 5.0 mm or less. If the paper thickness is less than 2.0 mm, the water absorbency is poor. If the paper thickness is more than 5.0 mm, the softness of the roll product 20 is poor, and the unevenness of the surface of the paper towels 20a becomes noticeable, making them more susceptible to damage. The lower limit of the paper thickness is more preferably 2.5 mm or more, and even more preferably 2.8 mm or more. The upper limit is more preferably 4.5 mm or less, and even more preferably 4.2 mm or less.

[0036] The paper thickness is measured using the following method. The device used is, for example, a dial thickness gauge "PEACOCK" manufactured by Ozaki Seisakusho Co., Ltd. The measurement conditions are a measurement load of 3.7 kPa, a probe diameter of 30 mm, a sample placed between the probe and the measurement table, and the gauge reading when the probe is lowered at a speed of 1 mm per second or less. The paper thickness is measured at 10 points: five different points in the MD direction of the sheet (Y direction in Figure 2) and five points shifted from these five points in the CD direction (X direction in Figure 2). It is important to measure the paper thickness at 10 different points, but the exact locations are not important.

[0037] When measuring the paper thickness per 10 plies, 10 plies (5 sets of 2-ply sheets) are stacked and measured, and the measurement is repeated 10 times and the results are averaged. Also, for a 3-ply sheet, 9 plies (3 sets of 3-ply sheets) are stacked and measured, and the paper thickness per ply is calculated from the measurement results and converted to 10 plies.

[0038] (Product basis weight) The basis weight per product ply of the paper towel 20a (hereinafter simply referred to as "product basis weight") is 33 g / m 2 More than 65g / m 2 The product basis weight is preferably 33 g / m 2 If the product has a basis weight of less than 65 g / m, the absorbency will be poor. 2 If the roll density exceeds 38 g / m, the roll density will be high, the softness of the roll product 20 will be reduced, and the surface of the paper towel 20a will become uneven and prone to damage. 2More preferably, 40 g / m 2 More preferably, the upper limit is 55 g / m 2 Less than 50 g / m is more preferable. 2 The following is more preferable: The basis weight of the product is measured in accordance with JIS P 8124.

[0039] (specific volume) The specific volume of the paper towel 20a has a lower limit of 12 cm 3 / g or more is preferable, and 13cm 3 / g or more is more preferable, and 14cm 3 / g or more is more preferable. The upper limit is 18 cm 3 / g or less is preferable, and 17cm 3 / g or less is more preferable, and 15cm 3 / g or less is more preferable. 3 If the specific volume is less than 18 cm3 / g, the paper will be thin and the water absorption will be poor. 3 If the specific volume of the paper towel 20a exceeds 1 / g, the surface irregularities of the paper towel 20a become significant and the paper towel 20a becomes easily damaged. 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 the volume cm per unit g. 3 It is expressed as:

[0040] (Water absorption <unit area>) The water absorption amount per unit area of ​​the paper towel 20a (hereinafter simply referred to as "water absorption amount <unit area>") is 300 g / m 2 More than 600g / m 2 The water absorption capacity (unit area) is preferably 300g / m or less. 2 If the water absorption capacity (unit area) is less than 600 g / m, the water absorption capacity will be poor. 2 If the water absorption amount exceeds 340 g / m, the product basis weight becomes high and the roll density becomes high, resulting in poor softness of the roll product 20. 2 More preferably, 400 g / m 2 More preferably, the upper limit is 520 g / m 2 Less than 470 g / m is more preferable. 2 The following is even more preferred:

[0041] (Water absorption <unit mass>) The water absorption per unit mass of the paper towel 20a (hereinafter simply referred to as "water absorption <unit mass>") is preferably 7.0 g / g or more and 13.0 g / g or less. If the water absorption <unit mass> is less than 7.0 g / g, the water absorption is poor. If the water absorption <unit mass> is more than 13.0 g / g, the product basis weight becomes high, the roll density becomes high, and the softness of the roll product 20 becomes poor. The lower limit of the water absorption <unit mass> is more preferably 8.0 g / g or more, and even more preferably 9.5 g / g or more. The upper limit is more preferably 12.0 g / g or less, and even more preferably 10.5 g / g or less.

[0042] The amount of water absorbed by the paper towel 20a in a dry state is measured in accordance with the following method. (1) A paper towel 20a superimposed on a product ply is taken and cut using a square template with one side measuring 76 mm to prepare a rectangular test piece 200 (see FIG. 4) with one side measuring 76 mm. (2) After measuring the mass of the test piece 200 before water absorption with an electronic balance, the test piece 200 is set in the holder 220. The holder 220 is a jig that fixes three points of the test piece 200, and the jig is made of a metal that does not absorb water. (3) 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. (4) After immersion for 2 minutes, the test piece 200 is removed from the distilled water together with the holder 220, and as shown in Figure 4, the holder 220 and the test piece 200 are hung on a rod placed in an empty water tank with the corner 200a facing up, the lid of the water tank is closed, and the test piece is left for 5 minutes. (5) Then, the holder 220 and the test piece 200 are taken out of the water tank, the holder 220 is removed, and the mass of the test piece 200 is measured using an electronic balance.

[0043] (Calculation of water absorption <unit area>) The water absorption amount <unit area> was calculated from the change in mass of the test piece 200 before and after immersion in distilled water, and was calculated as the amount of distilled water absorbed per unit area of ​​the test piece 200 (water g / sheet m 2 , 1m 2Per. Abbreviated as g / m 2 (See formula (1) below) Water absorption amount <unit area> = (change in mass of test piece 200) ÷ (area of ​​test piece 200) (1)

[0044] (Calculation of water absorption <unit mass>) Water absorption <unit mass> is the amount of water absorbed per unit area (g of water / sheet m 2 ) is divided by the basis weight of the product ply of the test piece 200 to calculate the water absorption per unit mass (g of water / g of sheet, per 1g, abbreviated as g / g) (see formula (2) below). Water absorption amount <unit mass> = (water absorption amount <unit area>) ÷ (basis weight of product ply) (2)

[0045] Measurements are taken five times for each sample and the average value is used. Measurements are performed in accordance with JIS P 8111 at a temperature of 23±1°C and humidity of 50±2%. Distilled water is also kept at 23±1°C.

[0046] (Root mean square height of surface roughness on an uneven surface) The root mean square height (hereinafter simply referred to as "Sq") of the surface roughness of the uneven surface of the paper towel 20a is preferably 35 μm or more and 170 μm or less. If Sq is less than 35 μm, the water absorbency is poor. If Sq exceeds 170 μm, the unevenness of the surface of the paper towel 20a becomes significant and the paper towel 20a becomes more susceptible to scratches. The lower limit of Sp is more preferably 50 μm or more, and even more preferably 60 μm or more. The upper limit is more preferably 120 μm or less, and even more preferably 100 μm or less.

[0047] Here, the "textured surface of paper towel 20a" refers to a paper surface having a textured pattern resulting from the papermaking process that is applied to paper towel 20a made using TAD papermaking technology.

[0048] Sq is measured using a microscope with the paper towel 20a in sheet form, either 2-ply or 3-ply. The measurement microscope can be Keyence Corporation's "One-Shot 3D Shape Measuring Machine VR-6000." Keyence Corporation's "Analysis Application VR-6000" can be used as software for observing, measuring, and analyzing microscope images. The measurement conditions are 12x magnification and a field of view of 24mm x 18mm. The measurement magnification and field of view may be changed as appropriate.

[0049] Figure 5 is a shading diagram of a height profile on the XY plane captured by a microscope. Filters are set for the image obtained in Figure 5. Specifically, an S-filter (low-pass filter) is set to remove components with a scale smaller than the cutoff wavelength from the image. An L-filter (high-pass filter) is also set to remove components with a scale larger than the cutoff wavelength from the image. Here, the S-filter is set to 500 μm, and the L-filter is set to 8 mm. By selecting the S-filter and L-filter, the root-mean-square height Sq is automatically calculated.

[0050] The measurement method is as follows. (1) For the sample, remove three wraps of paper towels 20a from the roll product 20, and cut the fourth wrap of paper towels 20a parallel to the CD so that the length in the MD is 40 cm. If the roll product 20 has perforations (not shown), cut it at the perforations so that the length in the MD is 35 cm or more. (2) Measurement is performed on the product ply, and if it has an embossed pattern 25, the measurement should be performed while avoiding the embossed pattern 25. However, if the embossed pattern is large or numerous and is included in the field of view of the microscope, the measurement may be performed with the embossed pattern included. Furthermore, the measurement may be performed on either the front side of the roll (the front side of the sheet) or the back side (the back side of the sheet), but it is preferable to measure from the front side. (3) Spread the sample so that the CD direction is horizontal and the MD direction is vertical, and measure two points approximately 5 cm below the top edge (CD direction) on an approximately straight line in the CD direction. (4) Next, measure two points approximately 10 cm below, 20 cm below, and 30 cm below the top edge (CD direction) in the same way as in (3), on an approximately straight line in the CD direction. (5) The average value of the total eight locations (2 x 4) measured in (3) and (4) is finally adopted as the root mean square height Sq.

[0051] (embossed pattern) The paper towel 20a preferably has an embossed pattern 25 as shown in FIG. 6, and more preferably the embossed pattern 25 is a linear embossed pattern 25a. Furthermore, it is even more preferable that the embossed pattern 25 has an inclined embossing. The provision of the embossed pattern 25 helps maintain the quality of the roll product 20, such as its paper thickness and absorbency. Furthermore, when the embossed pattern 25 has a linear embossed pattern 25a, the roll is less likely to be damaged, and when the roll product 20 is compressed, the embossing of the paper towel 20a is less likely to be crushed, thereby maintaining absorbency. Furthermore, when the embossing is inclined, the roll is less likely to be damaged, and the embossing is less likely to be crushed, thereby maintaining absorbency. Note that "linear" refers to embossings in the embossed pattern 25 that are 0.1 mm to 4 mm thick and 5 mm long.

[0052] <Roll products> The roll product 20 of this embodiment is a paper towel 20a wound into a roll, as shown in Fig. 2. The roll product 20 has a core 21 such as a cylindrical paper core or a cylindrical space in the center.

[0053] (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.

[0054] (core material) 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. If the core 21 does not contain LBKP, the core 21 will be easily crushed, and the roll product 20 will be easily deformed and damaged.

[0055] (Core outer diameter) The outer diameter of the core 21 (DI in FIG. 2) (hereinafter simply referred to as "DI") is preferably 28 mm or more and 58 mm or less. If the core outer diameter is less than 28 mm, the winding diameter of the roll product 20 becomes too small, making the roll product 20 more likely to move and be damaged inside the package 10. If the core outer diameter exceeds 58 mm, the winding diameter becomes larger, increasing the area of ​​friction of the roll product 20 inside the package 10 and making it more likely to be damaged. The lower limit of the core outer diameter 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.

[0056] The core outer diameter is measured, for example, using a diameter rule (manufactured by Muratec KDS Co., Ltd.). Three roll products 20 are measured and the measurement results are averaged. In the case of a roll product 20 without a core 21, the diameter of the cylindrical space (center hole) in the center of the roll product 20 is considered to be the core outer diameter DI.

[0057] (reel diameter) The roll diameter (DR in FIG. 2) (hereinafter simply referred to as "DR") of the roll product 20 is 125 mm or more and 175 mm or less. If the roll diameter is less than 125 mm, the softness of the roll product 20 will be poor when the roll density is high, and the roll product 20 will be prone to movement and damage inside the package 10 when the roll density is constant. If the roll diameter exceeds 175 mm, the unevenness of the surface of the paper towel 20a will be noticeable and prone to damage when the roll density is low, and the contact area between the roll products 20 inside the package 10 will be large and prone to damage when the roll density is constant, and the softness of the roll product 20 will be poor. The lower limit of the roll diameter is preferably 135 mm or more, and more preferably 145 mm or more. The upper limit is preferably 165 mm or less, and more preferably 155 mm or less.

[0058] (Volume length) The roll length of the roll product 20 (hereinafter simply referred to as "roll length") is preferably 18 m or more and 50 m or less. If the roll length is less than 18 m, the softness of the roll product 20 will be poor when the roll density is high, and the roll product 20 will be prone to movement and damage inside the package 10 when the roll density is constant. If the roll length exceeds 50 m, the unevenness of the surface of the paper towel 20a will be noticeable and prone to damage when the roll density is low, and the contact area between the roll products 20 inside the package 10 will be large and prone to damage when the roll density is constant, and the softness of the roll product 20 will be poor.

[0059] (roll width) The roll width (W in FIG. 2) (hereinafter simply referred to as "W") of the roll product 20 preferably has a lower limit of 200 mm or more, more preferably 230 mm or more, and even more preferably 250 mm or more. The upper limit is preferably 400 mm or less, more preferably 350 mm or less, and even more preferably 300 mm or less. If the roll width is less than 200 mm, the roll product 20 will move easily inside the package 10 and be easily damaged. If the roll width exceeds 400 mm, the area where the roll product 20 rubs inside the package 10 will be large, making it more likely to be damaged. Note that "roll width" refers to the length of the roll product 20 in the axial direction.

[0060] (roll mass <without core>) The roll mass of the roll product 20 per 280 mm of roll width, excluding the core 21 (hereinafter simply referred to as "roll mass <without core>"), preferably has a lower limit of 190 g or more, more preferably 240 g or more, and even more preferably 290 g or more. The upper limit is preferably 620 g or less, more preferably 570 g or less, and even more preferably 410 g or less. If the roll mass <without core> is less than 190 g, the roll product 20 will move easily inside the package 10 and be easily damaged. If the roll mass <without core> is more than 620 g, when the roll density is low, the unevenness of the surface of the paper towel 20a will become noticeable and the roll product 20 will be easily damaged. When the roll density is constant, the contact area between the roll products 20 inside the package 10 will be large, making the roll product 20 more susceptible to damage and resulting in a poor softness.

[0061] (winding density) The winding density of the roll product 20 (hereinafter also simply referred to as "winding density") is 0.20 m / cm 2 More than 0.60m / cm 2 The winding density is preferably 0.20 m / cm or less. 2 If the winding density is less than 0.60 m / cm, the roll product 20 becomes soft and easily damaged. 2 If the winding density exceeds 0.25 m / cm, the softness of the roll product 20 will be poor. 2 More preferably, 0.30 m / cm or more 2 The upper limit is 0.55 m / cm. 2 Less than 0.43m / cm is more preferable. 2 The following is even more preferred:

[0062] The winding density can be calculated using the following formula (3). Winding density = (winding length × number of plies) ÷ (cross-sectional area of ​​roll product 20) (3) The cross-sectional area of ​​the roll material 20 can be calculated by the following formula (4). 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) (4)

[0063] 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:

[0064] (roll density) The roll density of the roll product 20 (hereinafter also simply referred to as "roll density") is 0.04 g / cm 3 More than 0.16g / cm 3 The roll density is 0.04 g / cm or less. 3 If the roll density is less than 0.16 g / cm, the roll product 20 becomes soft and easily damaged. 3 If the density exceeds 0.05 g / cm, the softness of the roll product 20 will be poor. 3 More preferably, 0.06 g / cm or more 3 The upper limit is 0.13 g / cm. 3 Less than 0.10 g / cm is more preferable. 3 The following is even more preferred:

[0065] 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 (5). 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] (5)

[0066] For example, if the roll mass (without core) per roll width W280mm is 237g, the reel diameter (DR) is 154mm, and the core outer diameter (DI) is 44mm, the calculation is as follows: Roll density = 237g ÷ {(3.14 × (154mm ÷ 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.

[0067] (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 will have poor softness. If the winding softness exceeds 4.0 mm, the roll product 20 will become soft and easily damaged. 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. Note that "winding softness" refers to the softness of the roll product 20 when held in the hand.

[0068] The winding softness of the roll material 20 is measured as follows, for example, using a compression tester KES-G5 manufactured by Kato Tech Co., Ltd. The direction parallel to the axial direction of the roll material 20 is the height direction, and the direction perpendicular to the rotation axis of the roll material 20 is the radial direction. (1) The roll material 20 is placed horizontally on the table of the tester so that the axial direction of the roll material 20 is horizontal. Then, the compression element (contact area 2.0 cm) of the compression tester (KES-G5) is placed on the "axial center" of the roll material 20. 2 ) is pressed from above in the radial direction at a speed of 10 mm / min. The "center of the axial direction" is determined by measuring the roll width (W) with a metal ruler or tape measure, and determining the position where the measurement value is 1 / 2, and then pressing the compression element into this position. (2) The pressure with which the compressor 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 -T0) is measured as "rolling softness". (3) Next, the rolled 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). (4) Measurement is performed twice (at two angles) for one roll product 20. That is, for three roll products 20, measurement is performed twice for each, and the average of the measurement results for a total of six times (= two times / product x 3 products) is used as the final winding softness.

[0069] <Paper towel packaging> As shown in Figure 1, the package 10 is, for example, three roll products 20 that are caramel-wrapped 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.

[0070] (Number of rolls) The number of roll products 20 packed in the package 10 is three (rolls). If the number of rolls is other than three, the balance between the number of rolls contained in the package 10 and the size of the resin film 30 that is the packaging material will be poor, and the aesthetic appeal of the package 10 will be poor.

[0071] <Resin film> The resin film (hereinafter simply referred to as "film") 30 used to package the roll product 20 may be formed of a single layer or multiple layers. The material of the film 30 is preferably a thermoplastic resin suitable for recycling. Specific examples of thermoplastic resins include polyolefin (polyethylene, polypropylene, etc.), polyester (PET, etc.), polyamide (nylon, etc.), polycarbonate, polystyrene, polyvinyl chloride, etc. Among these, polyethylene film is preferred from the viewpoint of fully exhibiting the effects of this embodiment.

[0072] (resin film thickness) The lower limit of the thickness of the film 30 is preferably 20 μm or more, more preferably 23 μm or more, and even more preferably 26 μm or more. The upper limit is preferably 50 μm or less, more preferably 40 μm or less, and even more preferably 30 μm or less. If the thickness of the film 30 is less than 20 μm, the tightness of the package 10 will be poor, and the aesthetic appeal of the package 10 will be poor. If the thickness of the film 30 exceeds 50 μm, the film will be hard and stiff, making the roll product 20 more likely to be crushed when it comes into contact with the inside of the package 10. The thickness of the resin film 30 can be measured in accordance with JIS K 7130.

[0073] (Basis weight of resin film) The basis weight of the film 30 is 18 g / m 2 More than 45g / m 2 A basis weight of 18 g / m or less is preferred. 2 If the basis weight is less than 45 g / m, the tightness of the package 10 will be poor and the aesthetic appeal of the package 10 will be poor. 2 If the film 30 exceeds this value, the film 30 becomes hard and stiff, and the roll product 20 is likely to be crushed when it hits the inside of the package 10. The lower limit of the basis weight of the film 30 is 20 g / m 2 More preferably, 23 g / m 2 More preferably, the upper limit is 36 g / m 2 Less than 27 g / m is more preferable. 2 The following is even more preferred:

[0074] (Caramel packaging) The three rolls of rolled products 20 are arranged in parallel with their axial directions parallel to each other and are then wrapped in caramel wrapper using the film 30. When wrapped in a style other than caramel wrapper, the balance between the number of rolls contained in the package 10 and the size of the resin film 30 used as the packaging material is poor, resulting in a poor aesthetic appearance for the package 10.

[0075] The method of packaging caramel candy is well known. For example, three roll products 20 are placed on a sheet of film 30 so that their axial directions are parallel to one another, and the film 30 is then wrapped around the periphery of the roll products 20 to form a cylinder. Then, the overlapping portions of both ends of the film 30 on the periphery of the roll products 20 are heat-sealed (not shown) along the axial direction (X direction).

[0076] Alternatively, three roll products 20 arranged so that their axial directions are parallel to one another are raised from below the set sheet-like film 30 to the sheet surface (lower surface side) of the film 30. In this state, the film 30 is wrapped 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 with the circumferential surface of the roll product 20 are heat-sealed (not shown) along the axial direction (X direction).

[0077] Alternatively, three roll products 20 are 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, with the axial directions of the roll products 20 arranged in parallel to one another.

[0078] Then, of the film 30 protruding from both ends of the three roll products 20, two opposing flap-shaped edges are folded toward each other, and then another two opposing flap-shaped edges are similarly folded toward each other, and these folded portions are sealed by heat sealing or the like. The areas sealed by this heat sealing are heat-sealed adhesive portions 14, which are shown by hatching in Figures 1 and 3.

[0079] (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.

[0080] (Circumference of packaging) The lower limit of the circumferential length of the package 10 (hereinafter also referred to as "circumferential length A") is preferably 880 mm or more, more preferably 960 mm or more, and even more preferably 1040 mm or more. The upper limit is preferably 1600 mm or less, more preferably 1500 mm or less, and even more preferably 1400 mm or less. If the circumferential length A is less than 880 mm, the package 10 will not be tight enough and the aesthetic appeal of the package 10 will be poor. If the circumferential length A exceeds 1600 mm, the package 10 will be too tight, making the roll product 20 more susceptible to rubbing and damage. The circumferential length A of the package 10 refers to the outer periphery of the axial center of the package 10 shown in Figure 1.

[0081] The perimeter A of the package 10 can be measured as follows: The resin film 30 of the package 10 is cut open in the axial and circumferential directions with scissors, the roll product 20 is removed, and the resin film 30 is placed flat on a table. Then, using a measuring tape, such as a "Diameter Rule" manufactured by Muratec KDS Co., Ltd., the dimensions corresponding to the outer periphery of the package 10 are measured at a point 30 mm above the top surface 11 in the axial direction, a point 30 mm below the bottom surface 12 in the axial direction, and a point at the center in the axial direction, and the average of these dimensions is taken as the perimeter A. Note that the overlap of the heat-sealed portion of the resin film in the circumferential direction is not included in the outer periphery (perimeter).

[0082] (Circumference when roll products are lined up) When the roll products 20 are removed from the package 10 and three rolls of the roll products 20 are lined up, the circumferential length (hereinafter also referred to as "circumferential length B") preferably has a lower limit of 890 mm or more, more preferably 960 mm or more, and even more preferably 1035 mm or more. The upper limit is preferably 1250 mm or less, more preferably 1180 mm or less, and even more preferably 1110 mm or less. If the circumferential length B is less than 890 mm, the package 10 will not be tight enough, and the aesthetic appeal of the package 10 will be poor. If the circumferential length B exceeds 1250 mm, the package 10 will be too tight, making the roll products 20 more susceptible to rubbing and damage.

[0083] The circumference B of the package 10 can be measured as follows: Three roll products 20 are removed from the package 10, and the roll diameter (DR) of each roll product 20 is measured using a measuring tape, such as a "Diameter Rule" manufactured by Muratec KDS Co., Ltd., and the average value is calculated. The circumference B is then calculated using the following formula (6). For example, if the average roll diameter (DR) of the three roll products 20 is 150 mm, the circumference B is 1071 mm. Perimeter B=(Average winding diameter DR×3.14)+(Average winding diameter DR×4)...(6)

[0084] (Perimeter ratio) The circumference ratio of circumference A to circumference B (= circumference A / circumference B) (hereinafter simply referred to as "circumference ratio") is 0.94 or more and 1.40 or less. If the circumference ratio is less than 0.94, the package 10 will be too tight, making the roll product 20 more susceptible to rubbing and damage. If the circumference ratio exceeds 1.40, the package 10 will not be tight enough, and the cosmetic appearance of the package 10 will be poor. The lower limit of the circumference ratio is preferably 0.97 or more, more preferably 1.00 or more. The upper limit is preferably 1.30 or less, more preferably 1.20 or less.

[0085] (Perforation on packaging) The packaging 10 may have perforations for opening to remove the roll product 20, but it is preferable not to have such perforations. If perforations are provided, the packaging 10 may be opened unintentionally, especially in the case of a compact and tight-fitting packaging 10 such as that of the present invention. If perforations are provided, they may be formed, for example, along the axial direction of the roll product 20, from the top surface 11 of the packaging 10 through the side surface 13 to the bottom surface 12. Alternatively, the perforations may be formed in the circumferential direction of the packaging 10.

[0086] (Manufacturing methods for paper towels and roll products) The paper towel 20a and the roll product 20 according to this embodiment can be manufactured, for example, in the following order: In the (1) papermaking and creping step, it is preferable to use TAD papermaking technology. (1) Papermaking and creping (2) Embossing and adhesive treatment (3) Roll winding process

[0087] In the papermaking process (1), it is preferable that a concave-convex pattern derived from the papermaking process (fabric) be applied to paper towel 20a, which is different from embossed pattern 25. By having this concave-convex pattern, the water absorption capacity of paper towel 20a can be further increased.

[0088] "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.

[0089] 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]

[0090] 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.

[0091] (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 three roll products were caramel-wrapped to produce paper towel packages. Each paper towel package and roll product was then evaluated in the following four ways.

[0092] 1.Water absorption A sensory evaluation of the "water absorbency" of manufactured roll products was conducted by 30 monitors. One roll of the product was removed from the paper towel package, and 15g of water scattered on a table was wiped away from the outermost, central, and innermost periphery of the roll product using a sheet cut 35cm in the MD and parallel to the CD. The monitors evaluated the product using the same method as they normally would for paper towels, choosing either "The sheet has excellent water absorbency" or "The sheet has poor water absorbency," and the evaluation was made on a four-point scale depending on the number of people who selected "The sheet has poor water absorbency." The evaluation criteria are as follows: ◎: 0-1 people chose "The sheet has poor water absorption" 〇: 2-4 people chose "The sheet has poor water absorption" △: 5-7 people chose "The sheet has poor water absorption" ×: Eight or more people chose "The sheet has poor water absorption."

[0093] 2.Softness of rolled products A sensory evaluation of the "softness" of the roll products after production was conducted by 30 monitors. Each panelist took three roll products from the paper towel package, touched the outer periphery of each roll product with their hand, and selected either "the roll product is soft" or "the roll product is not soft." The evaluation was made on a four-point scale depending on the number of people who selected "the roll product is not soft." The evaluation criteria were as follows: ◎: 0-1 people chose "The roll product is not soft" 〇: 2-4 people chose "The roll product is not soft" △: 5-7 people chose "The rolled product is not soft" ×: 8 or more people chose "The roll product is not soft"

[0094] 3. Cosmetic packaging A sensory evaluation of the "appearance of packaging" of manufactured paper towel packages was conducted by 30 monitors. Each panelist touched one paper towel package with their hands and visually inspected it, choosing either "the packaging is tight enough, the roll product does not move, and the appearance is good" or "the packaging is not tight enough or the roll product moves, and the appearance is poor." The number of people who selected "the packaging is not tight enough or the roll product moves, and the appearance is poor" was used to evaluate the appearance on a four-point scale. The evaluation criteria were as follows: ◎: 0-1 person chose "The packaging is not tight enough or the roll product moves, making it less aesthetically pleasing." Good: 2-4 people chose "The packaging is not tight enough or the roll product moves, making it less aesthetically pleasing." △: 5-7 people chose "The packaging is not tight enough or the roll product moves, making it less aesthetically pleasing." ×: Eight or more people chose "The packaging is not tight enough or the roll product moves, resulting in poor aesthetics."

[0095] 4. Roll is not crushed or damaged A sensory evaluation of the roll products after manufacture for "absence of crushed or damaged rolls" was carried out by 30 monitors. Each panelist took three roll products out of the paper towel package, touched each roll product with their hands, and visually inspected them, choosing either "no crushed or damaged rolls" or "crushed or damaged rolls," and rated them on a four-point scale based on the number of people who chose "crushed or damaged rolls." The evaluation criteria were as follows: ◎: 0-1 people selected "The roll is crushed or scratched" Yes: 2-4 people selected "The roll is crushed or scratched" △: 5-7 people chose "The roll is crushed or scratched" ×: Eight or more people selected "The roll is crushed or scratched"

[0096] The results obtained are shown in Tables 1 and 2.

[0097] [Table 1]

[0098] [Table 2]

[0099] As is clear from the results shown in Tables 1 and 2, the packages of Examples 1 to 13 all maintained water absorbency, softness of the roll product, and aesthetic packaging, while suppressing crushing and damage caused by the rolls rubbing against each other within the package. In contrast, Comparative Examples 1 to 6 were inferior in any of water absorbency, softness of the roll, aesthetic packaging, and crushing and damage to the roll.

[0100] From the above, it has been confirmed that the present disclosure can provide a paper towel package that can maintain the absorbency, softness of the roll, and aesthetic appeal of the package, even for soft, high-quality TAD paper towels, while suppressing crushing and damage caused by the rolls rubbing against each other inside the package. [Explanation of symbols]

[0101] 10: Paper towel packaging 11: Top 12: Bottom 13: Side 14: Heat seal adhesive part 20: Roll products 20a: Paper towels 21: Core 25: Embossed pattern 25a: Linear embossed pattern 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 220: Holder

Claims

1. A paper towel package in which three rolls of paper towels are wound into a roll and then wrapped in a resin film. The roll product has a winding diameter of 125 mm or more and 175 mm or less, and a roll density of 0.04 g / cm ３ 0.16g / cm or more ３ Hereinafter, the winding softness is 1.2 mm or more and 4.0 mm or less, This paper towel package is characterized in that when the roll product is removed from the paper towel package, the ratio (=circumference A / circumference B) of the "perimeter of the paper towel package (perimeter A)" to the "perimeter of three rolls of the roll product lined up (perimeter B)" is 0.94 or more and 1.40 or less.

2. The basis weight of the resin film is 18 g / m ２ 45g / m or more ２ 2. The paper towel package of claim 1, wherein:

3. The water absorption capacity of the paper towel per unit area is 300 g / m ２ More than 600g / m ２ 3. The paper towel package of claim 1, wherein:

4. 3. The paper towel package according to claim 1, wherein the thickness of the paper towels per 10 plies is 2.0 mm or more and 5.0 mm or less.

5. The winding density of the roll product is 0.20 m / cm ２ 0.60m / cm or more ２ 3. The paper towel package of claim 1, wherein:

6. The basis weight of the paper towel product ply is 33 g / m ２ 65g / m or more ２ 3. The paper towel package of claim 1, wherein:

7. 3. The paper towel package according to claim 1, wherein the water absorption per unit mass of the paper towel is 7.0 g / g or more and 13.0 g / g or less.

8. 3. The paper towel package according to claim 1, wherein the roll product has a roll length of 18 m or more and 50 m or less.

9. 3. The paper towel package according to claim 1, wherein the paper towels are wound around a core, and the outer diameter of the core is 28 mm or more and 58 mm or less.

10. 10. The paper towel package according to claim 9, wherein the base paper used for the core contains LBKP (bleached hardwood kraft pulp).

11. 3. The paper towel package according to claim 1, wherein the paper towel has an embossed linear pattern.

12. 3. The paper towel package according to claim 1, wherein the root mean square height of the surface roughness of the uneven surface of the paper towel is 35 μm or more and 170 μm or less.

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