Paper towel package

Abstract

To provide a paper towel package which can package paper towels in a compact manner while maintaining the quality, even in the case of a high-quality paper towel which is bulky and soft and whose water absorption is good.SOLUTION: In a paper towel package, three rolls of roll products in which a paper towel is wound in a roll-like manner are caramel-packaged side by side by a resin film. The winding diameter of the roll product is equal to or greater than 125 mm and equal to or less than 175 mm, the roll density is equal to or greater than 0.04 g / cm3 and equal to or less than 0.16 g / cm3, and the ratio (=peripheral length A / peripheral length B) of "peripheral length of paper towel package (peripheral length A)" with respect to "peripheral length when three rolls of the roll products are arranged side by side (peripheral length B)" when the roll products are taken out of the paper towel package is equal to or greater than 0.90 and equal to or less than 1.02.SELECTED DRAWING: Figure 1

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 in 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 is free from 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 may not fit into cardboard boxes or pallets. While tight wrapping can flatten the roll and make it more compact, it can also cause problems such as the roll being crushed and quality not being maintained. Furthermore, tight wrapping can also cause the film to tear more easily. [Prior art documents] [Patent documents]

[0006] [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]

[0007] The present invention has been made in view of the above circumstances, and aims to provide a paper towel package that can compactly package even bulky, soft, and highly absorbent high-quality paper towels while maintaining the quality of the paper towels. [Means for solving the problem]

[0008] The inventors have conducted extensive research and have found that the above-mentioned problems can be solved by specifying the winding diameter and roll density 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. This has led to the completion of the present invention.

[0009] (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 The 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 0.90 or more and 1.02 or less.

[0010] (2) A second aspect of the present invention is the paper towel package according to (1), characterized in that the roll product has a winding softness of 1.2 mm or more and 4.0 mm or less.

[0011] (3) A third aspect of the present invention is the paper towel package according to (1) or (2), 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] (4) A fourth 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] (5) A fifth 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] (6) A sixth 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] (7) A seventh 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] (8) The eighth 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 g / g or more and 13 g / g or less.

[0017] (9) A ninth 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] (10) The tenth 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] (11) An eleventh aspect of the present invention is the paper towel packaging according to (10), characterized in that the base paper used for the core contains LBKP (hardwood bleached kraft pulp).

[0020] (12) A twelfth 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. [Effects of the Invention]

[0021] According to the present invention, it is possible to provide a paper towel package that can compactly package even bulky, soft, and highly absorbent high-quality paper towels while maintaining the quality of the paper towels. [Brief explanation of the drawings]

[0022] [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. 1 is a diagram showing a method for measuring the water absorption of a paper towel. [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 part of a paper towel manufacturing process. DETAILED DESCRIPTION OF THE INVENTION

[0023] 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.

[0024] 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.

[0025] "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).

[0026] Furthermore, as shown in Figure 1, when roll products are arranged so that they are parallel to each other in the axial direction, and a resin film sheet is wrapped around the periphery of the roll products 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 so that the MD and CD directions of the resin film are reversed.

[0027] 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.

[0028] 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 one sheet.

[0029] <Paper towel packaging> As shown in FIG. 1, the paper towel package 10 of the present invention is a roll product 20 in which three rolls of the paper towel 20a shown in FIG. 2 are wound into a roll and then caramel-wrapped in a resin film 30.

[0030] The details of each component are as follows:

[0031] <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.

[0032] 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.

[0033] (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 portions on the paper towel 20a and stacking the paper towel 20a in two or more plies, the paper towel 20a becomes bulky and has good water absorption. Furthermore, it is preferable that the embossed portions be provided on only one ply on the roll surface side.

[0034] (paper thickness) The thickness of the paper towels 20a per 10 plies (hereinafter simply referred to as "paper thickness of the paper towels 20a") is preferably 2.0 mm or more and 5.0 mm or less. If the thickness of the paper towels 20a is less than 2.0 mm, the paper thickness becomes too thin to maintain quality, and if it exceeds 5.0 mm, the roll product 20 cannot be compressed during packaging and cannot be packaged compactly. The lower limit of the thickness of the paper towels 20a 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.

[0035] 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.

[0036] (Basic weight) The basis weight of the product ply of the paper towel 20a is 33 g / m 2 More than 65g / m 2 The following is preferred: The basis weight of the product ply of the paper towel 20a is 33 g / m 2 If the thickness is less than 65 g / m, the tightness of the package 10 is poor. 2 If the weight of the roll product 20 exceeds 38 g / m, the roll product 20 cannot be compressed during packaging and cannot be packaged compactly. 2 More 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 is measured in accordance with JIS P 8124.

[0037] (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 it is less than 18cm / g, the paper thickness will be too thin and quality will not be maintained. 3 If the density exceeds 1 / g, the roll product 20 cannot be compressed during packaging and cannot be packaged compactly. 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:

[0038] (Water absorption per unit area) The water absorption per unit area of ​​the paper towel 20a is 300 g / m 2 More than 600g / m 2 The water absorption capacity of the paper towel 20a is preferably 300 g / m 2 If the weight is less than 600 g / m, the absorbency of the paper towel 20a will be poor and the quality will not be maintained. 2 If the amount of water absorption per unit area exceeds 340 g / m, the roll product 20 cannot be compressed during packaging and cannot be packaged compactly. 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:

[0039] (Water absorption <per unit mass>) The water absorption per unit mass of the paper towel 20a is preferably 7.0 g / g or more and 13.0 g / g or less. If the water absorption of the paper towel 20a is less than 7.0 g / g, the water absorption of the paper towel 20a is poor and quality cannot be maintained. If the water absorption of the paper towel 20a is more than 13.0 g / g, the roll product 20 cannot be compressed during packaging and cannot be packaged compactly. The lower limit of the water absorption per 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.

[0040] The amount of water absorption of 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 76 mm to prepare a rectangular test piece 200 (see FIG. 4) with sides of 76 mm. 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).

[0041] 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 is removed from the distilled water together with the holder 220, and the holder 220 and test piece 200 are hung from a rod installed in an empty water tank with the corner 200a opposite the corner 200d facing up, and the lid of the water tank is closed and left for 5 minutes. Thereafter, the holder 220 and test piece 200 are removed from the water tank, the holder 220 is removed, and the mass of the test piece 200 is measured using an electronic balance.

[0042] <Water absorption per unit area> The amount of water absorbed per unit area of ​​the test piece 200 was calculated from the change in mass of the test piece 200 before and after immersion in distilled water (water g / sheet m 2 , 1m 2 Per. Abbreviated as g / m 2 (See formula (1) below.) Water absorption per unit area = (change in mass of test piece 200) ÷ (area of ​​test piece 200) (1)

[0043] <Water absorption per unit mass> The amount of water absorbed per 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 per unit mass = (water absorption per unit area) ÷ (basis weight of product ply) (2)

[0044] Measurements are taken five times for each sample, and the average value is used. It is preferable to measure three-ply paper towels 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 a humidity of 50±2%. The distilled water is kept at 23±1°C.

[0045] (DMDT) The tensile strength in the MD direction (DMDT) of the paper towel 20a when dry according to JIS P 8113 (hereinafter simply referred to as "DMDT") is preferably 600 cN / 25 mm or more, more preferably 700 cN / 25 mm or more, and even more preferably 800 cN / 25 mm or more. The upper limit is preferably 1500 cN / 25 mm or less, more preferably 1400 cN / 25 mm or less, and even more preferably 1300 cN / 25 mm or less. If the DMDT is less than 600 cN / 25 mm, the paper towel is prone to tearing and quality cannot be maintained. On the other hand, if the DMDT exceeds 1500 cN / 25 mm, the paper towel is less soft and quality cannot be maintained.

[0046] (DCDT) The dry cross direction tensile strength (DCDT) of the paper towel 20a in the dry state according to JIS P 8113 (hereinafter simply referred to as "DCDT") is preferably 400 cN / 25 mm or more in lower limit, more preferably 600 cN / 25 mm or more, and even more preferably 750 cN / 25 mm or more in upper limit. 1400 cN / 25 mm or less is preferable, more preferably 1300 cN / 25 mm or less, and even more preferably 1150 cN / 25 mm or less in upper limit. If the DCDT is less than 400 cN / 25 mm, the paper towel is prone to tearing and quality cannot be maintained. On the other hand, if the DCDT exceeds 1400 cN / 25 mm, the paper towel is poor in softness and quality cannot be maintained.

[0047] The DMDT and DCDT of the paper towel 20a are measured in accordance with JIS P 8113.

[0048] (embossed pattern) The paper towel 20a preferably has an embossed pattern 25 as shown in FIG. 3, 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 is a linear embossed pattern 25a, the embossing of the paper towel 20a is less likely to be crushed when the roll product 20 is compressed, thereby maintaining quality. Furthermore, when the embossing is inclined, the embossing is less likely to be crushed, thereby maintaining quality. Note that "linear" refers to embossings in the embossed pattern that are 0.1 mm to 4 mm thick and 5 mm or longer.

[0049] <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, and the outer diameter (winding diameter) of the roll product 20 is DR, and the outer diameter of the core 21 is DI.

[0050] (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.

[0051] 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 becomes easily crushed, and the quality of the roll product 20 cannot be maintained.

[0052] (Core outer diameter) The outer diameter of the core 21 (DI in FIG. 2) (hereinafter also referred to as "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 DR of the roll product 20 becomes too small, and the package 10 is not tightly packed. If the core outer diameter DI exceeds 58 mm, the roll product 20 cannot be compressed during packaging, and therefore cannot be packaged compactly. 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.

[0053] The core outer diameter DI 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, 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.

[0054] (reel diameter) The roll diameter (DR in FIG. 2) of the roll product 20 (hereinafter also referred to as "roll diameter DR") is 125 mm or more and 175 mm or less. If the roll diameter DR is less than 125 mm, the package 10 will not be tight enough. If the roll diameter DR exceeds 175 mm, if the roll density of the roll product 20 is low, the roll product 20 will be compressed during packaging and quality will not be maintained, and if the roll density of the roll product 20 is above a certain level, the roll product 20 will not be compressed during packaging and will not be packaged compactly. The lower limit of the roll diameter DR is preferably 135 mm or more, more preferably 145 mm or more. The upper limit is preferably 165 mm or less, more preferably 155 mm or less.

[0055] (Volume length) The winding length of the roll product 20 (hereinafter simply referred to as "winding length") is preferably 18 m or more and 50 m or less. If the winding length is less than 18 m, the winding diameter DR of the roll product 20 becomes too small, and the package 10 becomes less tight. If the winding length exceeds 50 m, if the roll density of the roll product 20 is low, the roll product 20 will be compressed during packaging and quality will not be maintained, and if the roll density of the roll product 20 is above a certain level, the roll product 20 will not be compressed during packaging and will not be packaged compactly. 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 43 m or less, and even more preferably 35 m or less.

[0056] (roll width) The lower limit of the roll width (W in FIG. 2) (hereinafter also referred to as "roll width W") of the roll product 20 is preferably 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 W is less than 200 mm, the tightness of the package 10 will be poor. If the roll width W exceeds 400 mm, the tightness of the package 10 will be too great and the quality will not be maintained. Note that "roll width W" refers to the length of the roll product 20 in the axial direction.

[0057] (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 tightness of the package 10 will be poor. 2 If the winding density exceeds 0.25 m / cm, the roll product 20 cannot be compressed during wrapping and cannot be wrapped compactly. 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:

[0058] 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 using 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) 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:

[0059] (Rolling softness) The rolling softness of the roll product 20 (hereinafter simply referred to as "rolling softness") is 1.2 mm or more and 4.0 mm or less. If the rolling softness is less than 1.2 mm, the roll product 20 becomes too hard, and the roll product 20 cannot be compressed during packaging, resulting in a compact package. If the rolling softness exceeds 4.0 mm, the roll product 20 becomes too soft, resulting in a poor tightness of the package 10. The lower limit of the rolling 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 "rolling softness" refers to the softness of the roll product 20 when held in the hand.

[0060] 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 rotation axis of the roll material 20 is defined as the radial direction.

[0061] First, 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 KES-G5 compression tool (contact area 2.0 cm ) 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 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 The "axial center" of the roll product 20 is determined by measuring the roll width (W) with a metal ruler or tape measure, halving the measured value, and pressing the compression element into that position.

[0062] Next, the rolled product 20 is rotated 90 degrees in the circumferential direction around its axis, 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 three roll products 20, measurement is performed twice for each, and the average of the measurement results for a total of six times (=2 times / product x 3 products) is used as the final winding softness.

[0063] (roll mass <without core>) The lower limit of the roll mass of the roll product 20 per 280 mm roll width W, excluding the core 21 (hereinafter simply referred to as "roll mass <coreless>") is preferably 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 <coreless> is less than 190 g, the winding diameter DR becomes too small, resulting in a poor tightness of the package 10. If the roll mass <coreless> exceeds 620 g, the winding diameter DR becomes too large, making it impossible to compress the roll product 20 during packaging and resulting in a compact package.

[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 will be crushed too much and the quality will not be maintained. 3 If the density exceeds 0.05 g / cm, the roll product 20 becomes too hard and cannot be compressed during packaging, resulting in a compact package. 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) 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.

[0066] <Paper towel packaging> As shown in FIG. 1, the paper towel package 10 is made by caramel-wrapping three 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.

[0067] (Number of rolls) The number of rolled products 20 packed in the package 10 is three (rolls). If the number of rolls is other than three, the rolled products 20 cannot be packed tightly and compactly.

[0068] <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.

[0069] (film thickness) The lower limit of the thickness of the resin 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. If the thickness of the film 30 exceeds 50 μm, the tightness of the package 10 will be too high and the quality will not be maintained. The thickness of the resin film 30 can be measured in accordance with JIS K 7130.

[0070] (film basis weight) The basis weight of the resin 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. 2 If the weight of the resin film 30 exceeds 20 g / m, the packaging body 10 will be too tight and the quality will not be maintained. 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:

[0071] (Caramel packaging) The three rolls of rolled products 20 are arranged side by side with their axial directions parallel to each other, and are then wrapped in caramel-like packaging with the resin film 30. Caramel-like packaging is well known.

[0072] For example, three roll products 20 are placed on a sheet-like film 30 so that their axial directions are parallel to one another, and in this state, the film 30 is wrapped around the circumferential surface of the roll product 20 to form a cylinder. Then, 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).

[0073] 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).

[0074] 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 parallel to one another.

[0075] 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.

[0076] (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.

[0077] (Circumference of packaging) The lower limit of the circumferential length of the packaging body 10 (hereinafter also referred to as "circumferential length A") is preferably 850 mm or more, more preferably 950 mm or more, and even more preferably 1000 mm or more. The upper limit is preferably 1140 mm or less, more preferably 1100 mm or less, and even more preferably 1050 mm or less. If the circumferential length A is less than 850 mm, the tightness of the packaging body 10 will be poor. If the circumferential length A exceeds 1140 mm, the tightness of the packaging body 10 will be too high, and the roll product 20 will be too crushed and the quality will not be maintained. Note that the circumferential length A of the packaging body 10 means the outer periphery length of the axial center of the packaging body 10 shown in Figure 1.

[0078] The circumferential length A of the package 10 can be measured as follows. As shown in Figure 1, the package 10 is placed on a table with the axial direction of the roll product 20 aligned vertically. Then, using a measuring tape (a diameter rule manufactured by Muratec KDS Co., Ltd.), the outer periphery of the package 10 is measured at an upper portion 30 mm above the top surface 11 of the package 10 in the axial direction, at a lower portion 30 mm above the bottom surface 12 in the axial direction, and at the center of the package 10 in the axial direction, and the average of these measurements is taken as the circumferential length A. The circumferential length A includes the length of the resin film.

[0079] (Circumference when three rolls of rolled products are lined up) The lower limit of the circumference (hereinafter also referred to as "circumference B") when the roll products 20 are removed from the package 10 and three rolls of the roll products 20 are lined up is preferably 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 circumference B is less than 890 mm, the tightness of the package 10 is poor. If circumference B exceeds 1250 mm, the tightness of the package 10 is too high, and the roll products 20 are overly crushed, making it impossible to maintain quality.

[0080] 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 is measured using a measuring tape (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 of the roll diameters 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)

[0081] (ratio of perimeter A to perimeter B) The ratio of circumference A to circumference B (= circumference A / circumference B) is 0.90 or more and 1.02 or less. If the ratio (circumference A / circumference B) is less than 0.90, the package 10 is too tight, and the roll product 20 is crushed too much, making it impossible to maintain quality. If the ratio (circumference A / circumference B) exceeds 1.02, the package 10 is poorly tight. The lower limit of the ratio (circumference A / circumference B) is preferably 0.92 or more, more preferably 0.94 or more. The upper limit is preferably 1.00 or less, more preferably 0.98 or less.

[0082] (perforation) 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.

[0083] (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

[0084] 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.

[0085] "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.

[0086] 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]

[0087] 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.

[0088] (Examples 1 to 9, Comparative Examples 1 to 4) For Examples 1 to 9 and Comparative Examples 1 to 4, paper towels and roll products were produced by the above-mentioned method under the conditions shown in Table 1, 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 three ways.

[0089] 1. Compactness A sensory evaluation was conducted by 20 panelists on the "compactness" of the packaging. Each panelist held an unopened paper towel package and selected either "compactly packaged" or "not compactly packaged," and evaluated it according to the following criteria. ◎: "Compact packaging" - 18 or more people ○: "It can be packaged compactly" - 15 to 17 people △: "It can be packaged compactly": 12 to 14 people ×: "It is compactly packaged" - 0 to 13 people

[0090] 2. Tightness of packaging A sensory evaluation was conducted by 20 panelists on the "tightness of packaging" of the packaging. Each panelist held an unopened paper towel package and selected either "the packaging is tight" or "the packaging is not tight," and rated it according to the following criteria. ◎: "The packaging is tight" - 18 or more people ○: "The packaging is tight" - 15 to 17 people △: "The packaging is tight" - 12 to 14 people ×: "The packaging is tight" - 0 to 13 people

[0091] 3.Quality maintenance When the roll product was removed from the packaging, the paper thickness and amount of water absorption per unit area were measured for "quality retention" and evaluated according to the following criteria. If either the paper thickness or amount of water absorption did not meet the standard for each level, it was lowered to the next level that it could meet. For example, if the paper thickness was 2.7 mm and the amount of water absorption was 320 g, the paper thickness would be rated as "Good", but the amount of water absorption would be rated as "Good", so the "quality retention" rating would be "Good". ◎: Paper thickness is 2.8mm or more and water absorption is 400g or more ○: Paper thickness is 2.5mm or more and less than 2.8mm, and water absorption is 340g or more and less than 400g △: Paper thickness is 2.0 mm or more and less than 2.5 mm, and water absorption is 300 g or more and less than 340 g ×: When the paper thickness is less than 2.0 mm or the water absorption is less than 300 g

[0092] The results obtained are shown in Table 1.

[0093] [Table 1]

[0094] As is clear from the results shown in Table 1, the packages of Examples 1 to 9 were all excellent in compactness, tightness of the package, and quality maintenance. In contrast, the packages of Comparative Examples 1 to 4 were inferior in any of compactness, tightness of the package, and quality maintenance.

[0095] From the above, it has been confirmed that the present disclosure can provide a paper towel package that can compactly package even bulky, soft, and highly absorbent high-quality paper towels while maintaining the quality of the paper towels. [Explanation of symbols]

[0096] 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 is as follows: 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 0.90 or more and 1.02 or less.

2. 2. The paper towel package according to claim 1, wherein the roll product has a winding softness of 1.2 mm or more and 4.0 mm or less.

3. The basis weight of the resin film is 18 g / m ２ 45g / m or more ２ 3. The paper towel package of claim 1, wherein:

4. 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:

5. 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.

6. 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:

7. 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:

8. 3. The paper towel package according to claim 1, wherein the water absorption per unit mass of the paper towel is 7 g / g or more and 13 g / g or less.

9. 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.

10. 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.

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

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

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