Kitchen towel roll package

Abstract

To provide a kitchen towel roll package that has two 2 to 3-ply kitchen towel rolls, superior in water absorptivity and cost and having a large winding diameter, packaged together and that has excellent package tightness and hardly has a collapse of a kitchen towel roll.SOLUTION: There is provided a kitchen towel roll package that is formed by packaging two kitchen towel rolls, each having a 2 to 3-ply kitchen towel sheet rolled, adjacently with axial directions substantially parallel with each other, with a film, wherein the kitchen towel sheet has a basis weight per product ply of 30 to 56 g / m2, and a water absorption amount per unit area of 300 to 610 g / 2, the kitchen towel roll has a winding diameter of 127 to 175 mm and a winding hardness of 1.0 to 5.0 mm, and the packaging film has a sinking depth of 3 to 20 mm.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a kitchen towel roll package. [Background technology]

[0002] Kitchen towels are becoming longer in length, but high-end products also require higher quality. Among these, kitchen towel sheets made using the so-called TAD (Through Air Dryer, also known as Through Air Drying) papermaking technology are thick, have excellent absorbency, and a soft texture.

[0003] As a technology relating to papermaking technology using through-air drying, Patent Document 1 discloses an uncreped through-air dried tissue sheet having about 10 to about 150 protrusions per 6.45 square centimeters (1 square inch) with a height of about 0.012 millimeters (0.005 inches) or more, a cross-machine direction elongation rate of about 9 percent or more, and a basis weight of about 10 to 70 grams per square meter.

[0004] Here, in the case of kitchen towel rolls, when sold as a product, multiple rolls are often packaged together. In the case of ordinary kitchen towel rolls, multiple rolls can be packaged without any particular problems, and no particular problems arise during transportation after packaging. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 3758702 Summary of the Invention [Problem to be solved by the invention]

[0006] However, kitchen towel rolls made with kitchen towel sheets manufactured using TAD papermaking technology have a soft texture, making it difficult to adjust the film tension during packaging, and the packaging tends to be unstable. While increasing the film tension is one solution, the inventors' detailed investigation revealed that increasing the film tension too much can lead to problems such as the packaging being too tight, crushing the roll, and reducing the texture achieved by TAD papermaking. Furthermore, this problem is particularly pronounced when packaging multiple rolls, especially when packaging two rolls.

[0007] As described above, when packaging two kitchen towel rolls made using the TAD papermaking method, which has excellent water absorption properties, it is difficult to maintain the tightness of the package within a certain range while maintaining the texture of the kitchen towel sheet.

[0008] The present invention has been made in view of the above circumstances, and aims to provide a kitchen towel roll package in which two kitchen towel rolls each made of 2-3 plies of kitchen towel sheet wound into a roll are packaged together, the package having good tightness, excellent water absorbency and cost of the sheet, a bulky and soft texture, and the rolls being resistant to crushing. [Means for solving the problem]

[0009] As a result of extensive research into achieving the above-mentioned object, the inventors discovered that in a kitchen towel roll package formed by winding two or three plies of kitchen towel sheet into a roll, two rolls are arranged adjacent to each other with their axial directions approximately parallel and then wrapped in film, the basis weight per product ply of kitchen towel sheet, the water absorption per unit area, the winding diameter of the kitchen towel roll, the sinking depth of the packaging film, and the tightness of the kitchen towel roll can all be within predetermined numerical ranges, leading to the completion of the present invention. Specifically, the present invention is as follows.

[0010] (1) A kitchen towel roll package is formed by winding up 2 to 3 plies of kitchen towel sheets into a roll, and then wrapping two rolls of the kitchen towel sheets side by side so that the axial directions are approximately parallel, in a film package. The kitchen towel sheets have a basis weight per product ply of 30 g / m. 2 More than 56g / m 2 Below, the water absorption per unit area is 300g / m 2 More than 610g / m 2 the kitchen towel roll package is such that the winding diameter of the kitchen towel rolls is 127 mm or more and 175 mm or less and the winding tightness is 1.0 mm or more and 5.0 mm or less; when the kitchen towel roll package is placed so that the axial direction of the two kitchen towel rolls is horizontal, a first stainless steel ruler having a mass of 64 g, a thickness of 1.0 mm, a width of 25 mm and a scale length of 300 mm is placed across two adjacent kitchen towel rolls in a first direction perpendicular to the axial direction, and the plate surface of the first ruler is placed in contact with the packaging film to serve as a reference line; and a second stainless steel ruler having a mass of 64 g, a thickness of 1.0 mm, a width of 25 mm and a scale length of 300 mm is placed on the packaging film between the two adjacent kitchen towel rolls so that the width direction of the second ruler is aligned with the first direction, the depth to which the packaging film sinks due to the weight of the second ruler relative to the reference line is 3 mm or more and 20 mm or less. (2) The roll density of the kitchen towel roll is 0.04 g / cm 3 More than 0.13g / cm 3 The kitchen towel roll packaging described in (1) above is as follows. (3) The kitchen towel roll package according to (1) or (2) above, wherein the percentage of the actual circumference of the film to the theoretical circumference of the packaging film calculated from the winding diameter of the kitchen towel roll ((actual film circumference / theoretical circumference of packaging film) x 100(%)) is 94% or more and 101% or less. (4) The kitchen towel roll package according to (1) or (2) above, wherein the film packaging is in the form of caramel packaging. (5) The kitchen towel roll package according to (1) or (2) above, wherein the film packaging is in the form of a gusset package. (6) The kitchen towel roll packaging according to (1) or (2) above, wherein the kitchen towel sheet has an uneven pattern resulting from the papermaking process, different from the embossed pattern. (7) The specific volume of the kitchen towel sheet is 7 cm 3 / g or more 23cm 3 The kitchen towel roll packaging according to (1) or (2) above, wherein the moisture content is 0.05% or less. (8) The kitchen towel roll package according to (1) or (2) above, wherein the thickness of the kitchen towel sheets per 10 sheets is 2.0 mm or more and 4.0 mm or less per 10 sheets. (9) The kitchen towel roll package according to (1) or (2) above, wherein the roll length of the kitchen towel roll is 18 m or more and 45 m or less. (10) In the kitchen towel roll packaging according to (1) or (2) above, the kitchen towel sheet has an embossed pattern, and the embossed area ratio in the embossed pattern is 4% or more and 30% or less. (11) The kitchen towel roll package according to (1) or (2) above, wherein the product of the roll density of the kitchen towel roll and the percentage of the actual circumference of the packaging film relative to the theoretical circumference of the film is 4 or more and 12 or less. (12) The kitchen towel roll packaging according to (1) or (2) above, wherein the kitchen towel sheet has an embossed pattern, but the back side does not have the embossed pattern. (13) The kitchen towel roll package according to (1) or (2) above, wherein the thickness of the packaging film is 18 μm or more and 52 μm or less. (14) In the kitchen towel roll package according to (1) or (2) above, the kitchen towel sheet contains wet pulp, and the wet pulp content is 60% or more. (15) The kitchen towel roll is a kitchen towel roll package according to (1) or (2) above, in which the kitchen towel roll has a paper tube at its center that is parallel to the axial direction, and the paper tube has a BKP content of 60% or more. [Effects of the Invention]

[0011] According to the present invention, there can be provided a kitchen towel roll package in which two kitchen towel rolls each made of 2 to 3 plies of kitchen towel sheet wound into a roll are packaged together, and the package has good tightness, the sheets have excellent water absorbency and cost, are bulky and soft in texture, and the rolls are resistant to crushing. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a perspective view of a kitchen towel roll packaging according to an embodiment of the present invention. FIG. [Figure 2] FIG. 1 is a perspective view of a kitchen towel roll according to an embodiment of the present invention. [Figure 3] FIG. 2 is a diagram showing an example of an embossing pattern in the kitchen towel roll of the present embodiment. [Figure 4] FIG. 1 is a diagram showing a height profile on the XY plane as observed by a microscope using shading. [Figure 5] FIG. 1 is a graph showing a height profile on the XY plane obtained by a microscope. [Figure 6] FIG. 10 is a diagram showing how to determine the embossing depth for an embossing pattern. [Figure 7] FIG. 2 is a diagram showing a method for measuring the water absorption of the kitchen towel sheet of the present embodiment. [Figure 8] 1 is a diagram showing a part of the papermaking process for the kitchen towel sheet of the present embodiment. FIG. [Figure 9] 1 is a diagram showing a method for measuring the sinking depth of the packaging film in the kitchen towel roll packaging of this embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, a mode for carrying out the present invention (hereinafter simply referred to as "the present embodiment") will be described in detail. The following present embodiment is an example for explaining the present invention, and is not intended to limit the present invention to the following content. The present invention can be carried out by appropriately modifying it within the scope of its gist.

[0014] Furthermore, in this specification, terms with "abbreviation" attached indicate the meaning of the term excluding "abbreviation" within the scope of common technical knowledge of a person skilled in the art, and also include the meaning itself excluding "abbreviation."

[0015] <Kitchen towel roll packaging> FIG. 1 is a perspective view of a kitchen towel roll packaging body 1 (hereinafter also simply referred to as "packaging body 1") according to this embodiment.

[0016] As shown in Figure 1, the kitchen towel roll package 1 according to this embodiment is a kitchen towel roll 10 made by winding up two or three plies of kitchen towel sheets 10x into a roll, with two rolls arranged adjacent to each other so that their axial directions are approximately parallel, and then wrapped in film. The kitchen towel sheets 10x have a basis weight per product ply of 30 g / m 2 More than 56g / m 2 Below, the water absorption per unit area is 300g / m 2 More than 610g / m 2The following is true. The winding diameter of the kitchen towel roll 10 is 127 mm or more and 175 mm or less. The kitchen towel roll package 1 is placed so that the axial direction of the two kitchen towel rolls 10 is horizontal. A stainless steel first ruler measuring 64 g, 1.0 mm thick, 25 mm wide, and 300 mm in scale length is placed across two adjacent kitchen towel rolls 10 in a first direction perpendicular to the axial direction. The first ruler's flat surface is placed in contact with the packaging film 2 to serve as a reference line. A stainless steel second ruler measuring 64 g, 1.0 mm thick, 25 mm wide, and 300 mm in scale length is then placed on the packaging film 2 between the two adjacent kitchen towel rolls 10, with the second ruler's width direction aligned with the first direction, perpendicular to the packaging film 2. The depth to which the packaging film 2 sinks due to the weight of the second ruler relative to the reference line is 3 mm or more and 20 mm or less. Furthermore, the tightness of the kitchen towel roll 10 is 1.0 mm or more and 5.0 mm or less.

[0017] The packaging form of the kitchen towel roll package 1 is preferably caramel packaging. Also, the packaging form is preferably gusset packaging.

[0018] The kitchen towel roll packaging 1 of this embodiment is made of 2 to 3 plies, has excellent water absorption and cost, is bulky and soft to the touch, and is made by wrapping two kitchen towel rolls 10 with a large winding diameter side by side in film.In order to ensure the aesthetic appeal (tightness) of the packaging, the kitchen towel roll packaging 1 has the following characteristics:

[0019] (tightness) Fig. 9 is a diagram showing a method for measuring the sinking depth of the packaging film 2 in the kitchen towel roll packaging 1. Fig. 9 shows the kitchen towel roll packaging 1 placed on a stand B as viewed from the axial direction of the kitchen towel roll 10. In the figure, arrow X indicates the upward direction, and arrow Y indicates the first direction.

[0020] The tightness can be expressed as the depth d of the packaging film 2 sinking due to the weight of the second ruler R when the first ruler S is placed across two adjacent kitchen towel rolls 10 and the second ruler R is placed on the packaging film 2 located between the two kitchen towel rolls 10 (hereinafter sometimes simply referred to as the "sinking depth d of the packaging film 2").

[0021] The recession depth d of the packaging film 2 is 3 mm or more and 20 mm or less relative to the reference line SL. Setting the recession depth d of the packaging film 2 within the above-mentioned range ensures the aesthetic appeal (tightness) of the kitchen towel roll package 1 and its resistance to tearing during transport. Furthermore, if the recession depth d of the packaging film 2 is below the above-mentioned lower limit, the packaged kitchen towel roll 10 is easily crushed. This problem is particularly likely to occur with rolls with large winding diameters, as the contact area between the rolls is large. However, according to this embodiment, this problem can be effectively prevented even with large winding diameters. If the recession depth d of the packaging film 2 exceeds the above-mentioned upper limit, the aesthetic appeal (tightness) of the package is poor. To further improve the above-mentioned effects, the lower limit of the above-mentioned range of the recession depth d of the packaging film 2 is preferably 5 mm or more, more preferably 7 mm or more. Furthermore, the upper limit of the above-mentioned range of the recession depth d of the packaging film 2 is preferably 15 mm or less, more preferably 13 mm or less.

[0022] The sinking depth d of the packaging film 2 is measured as shown in FIG.

[0023] First, as shown in FIG. 9, the kitchen towel roll package 1 is placed on a table B or the like so that the axial direction of the kitchen towel roll 10 is horizontal. Then, a stainless steel first ruler S is placed across two adjacent kitchen towel rolls 10 in a first direction (the direction indicated by arrow Y in FIG. 9) perpendicular to the axial direction of the kitchen towel roll 10, with its plate surface in contact with the packaging film 2. The surface (line) of the first ruler S that contacts the packaging film 2 is designated as the reference line SL (indicated by the two-dot chain line in FIG. 9). Next, a stainless steel second ruler R is placed on top of the packaging film 2 located between the two adjacent kitchen towel rolls 10. When placing this second ruler R, the second ruler R is placed perpendicular to the packaging film 2, approximately in the center of the packaging film 2 between the two adjacent kitchen towel rolls 10 in the first direction, with the width direction Rw of the second ruler R aligned with the first direction. Then, the sinking depth d of the packaging film 2 due to the weight of the second ruler R relative to the height position of the reference line SL of the first ruler S is measured. The first ruler S is a JIS Class 1 ruler with a mass of 64 g, a thickness of 1.0 mm, a width of 25 mm, and a scale length of 300 mm. The second ruler R is a second ruler R with a mass of 64 g, a thickness of 1.0 mm, a width of 25 mm, and a scale length of 300 mm. For example, the "Silver Ruler" by Shinwa Measuring Instruments Co., Ltd. can be used as the first ruler S and the second ruler R.

[0024] The sinking depth d of the packaging film 2 is measured at three locations: one 25% from each end of the axial direction of the kitchen towel roll package 1 (the axial direction of the kitchen towel roll 10) and one 25% position in the center of the axial direction. Measurements are also taken on the front and back of each kitchen towel roll package 1. This is done for two kitchen towel roll packages 1, and the sinking depth d values ​​at a total of 12 locations are averaged and used as the sinking depth d of the packaging film 2.

[0025] In the kitchen towel roll package 1 according to this embodiment, the percentage of the actual circumference of the packaging film 2 relative to the theoretical circumference of the packaging film 2, calculated from the winding diameter of the kitchen towel roll 10 described below ((actual circumference of the packaging film / theoretical circumference of the packaging film) × 100(%)), is preferably 94% or more and 101% or less. The lower limit of the above-mentioned range of the percentage ((actual circumference of the packaging film / theoretical circumference of the packaging film) × 100(%)) is more preferably 96% or more, and even more preferably 97% or more. The upper limit of the above-mentioned range of the percentage ((actual circumference of the packaging film / theoretical circumference of the packaging film) × 100(%)) is more preferably 100% or less, and even more preferably 99% or less. When the percentage is equal to or greater than the above-mentioned lower limit, problems such as crushing of the kitchen towel roll 10 due to compression of the kitchen towel roll 10 by the packaging film 2 can be more effectively prevented. When the percentage is equal to or less than the above upper limit, the tightness and shape retention of the kitchen towel roll package 1 can be more effectively prevented, and damage to the kitchen towel roll 10 can be more effectively suppressed.

[0026] Furthermore, the theoretical circumference of the packaging film 2 is preferably 640 mm or more and 900 mm or less, and the actual circumference of the packaging film 2 is preferably 620 mm or more and 880 mm or less. The lower limit of the above range of the theoretical circumference of the packaging film 2 is more preferably 670 mm or more, and even more preferably 700 mm or more. The upper limit of the above range of the theoretical circumference of the packaging film 2 is more preferably 860 mm or less, and even more preferably 820 mm or less. The lower limit of the above range of the actual film circumference is more preferably 650 mm or more, and even more preferably 680 mm or more. The upper limit of the above range of the actual film circumference is more preferably 840 mm or less, and even more preferably 800 mm or less. When the theoretical circumference is equal to or greater than the above lower limit or when the actual packaging film circumference is equal to or greater than the above lower limit, it is possible to more effectively prevent a decrease in basis weight to achieve a constant roll density due to a smaller winding diameter, and as a result, it is possible to more effectively prevent a decrease in the water absorbency of the kitchen towel sheet 10x. If the theoretical circumference is less than the upper limit described above, or if the actual circumference of the packaging film is less than the upper limit described above, it is possible to more effectively prevent the contact area between rolls from increasing due to an increase in the winding diameter, and it is possible to more effectively prevent the roll from becoming more easily crushed due to increased damage to the kitchen towel roll 10.

[0027] To determine the theoretical circumference of packaging film 2 of kitchen towel roll packaging 1, first tear packaging film 2 of kitchen towel roll packaging 1, remove both kitchen towel rolls 10, and measure the winding diameter of each (measure one point in the center of each roll in the width direction (axial direction) of the roll, and calculate the average value for the two rolls). Then, the theoretical circumference of the packaging film 2 is calculated based on the following formula. Theoretical circumference of packaging film 2 = roll diameter x 4 + roll diameter x 3.14

[0028] The actual circumference of packaging film 2 is determined by measuring the circumference direction R near the center of the kitchen towel roll packaging 1 in the height direction (axial direction) with a ruler or the like (tape measure or the like). The circumference is measured by removing both kitchen towel rolls 10 and measuring only the packaging film 2. Note that when the packaging is in the form of caramel packaging as shown in Figure 1, the packaging film 2 overlaps in a portion of the circumference direction R, but this overlapping portion is not included in the circumference. To measure the circumferential length of packaging film 2, for example, the opening of packaging film 2 in kitchen towel roll package 1 that contacts kitchen towel roll 10 on a surface perpendicular to the axial direction is cut open, and kitchen towel roll 10 is removed. Next, packaging film 2 is folded so as to spread outward in the circumferential direction, and both circumferential sides of packaging film 2 are overlapped. The circumferential length of packaging film 2 in this flattened state is measured, and the circumferential length of packaging film 2 is determined by doubling the measurement.

[0029] In the kitchen towel roll package 1 according to this embodiment, the product of the roll density of the kitchen towel roll 10 (described later) and the percentage of the actual circumference of the packaging film relative to the theoretical circumference of the packaging film ((roll density) × (actual circumference of packaging film / theoretical circumference of packaging film) × 100(%)) is preferably 4 or more and 12 or less. The lower limit of the above range of the product ((roll density) × (actual circumference of film / theoretical circumference of packaging film) × 100(%)) is more preferably 5 or more, and even more preferably 6 or more. The upper limit of the above range of the product ((roll density) × (actual circumference of film / theoretical circumference of packaging film) × 100(%)) is more preferably 11 or less, and even more preferably 9 or less. When the product is equal to or greater than the above lower limit, crushing of the packaged kitchen towel roll 10 can be more effectively suppressed. When the product is equal to or less than the above upper limit, deterioration of the texture of the kitchen towel roll 10 can be more effectively suppressed.

[0030] In this case, the product of the roll density of kitchen towel roll 10 and the percentage of the actual circumference of packaging film 2 relative to the theoretical circumference of packaging film 2 in kitchen towel roll package 1 described above represents the balance between kitchen towel roll 10 and packaging film 2. In other words, when kitchen towel roll 10 has a high roll density, the percentage value is increased (the theoretical circumference of packaging film 2 is shortened) to maintain the texture of kitchen towel roll 10 when packaged, thereby preventing rubbing of kitchen towel roll 10. On the other hand, when the roll density is low, the percentage value is decreased (the theoretical circumference of packaging film 2 is lengthened) to prevent kitchen towel roll 10 from being crushed when packaged, thereby preventing kitchen towel roll 10 from being compressed by packaging film 2.

[0031] The kitchen towel roll packaging 1 shown in FIG. 1 may be prepared, for example, in six packs (12 rolls in total), which may then be further packaged (not shown). In this case, there is no particular limit to the total number of rolls, but it is preferably between 4 and 16 rolls in total. The lower limit of the above range of the total number of rolls is more preferably 6 rolls or more. The upper limit of the above range of the total number of rolls is more preferably 14 rolls or less. The total number of rolls is even more preferably 12 rolls. When the total number of rolls is equal to or less than the above upper limit, damage to the kitchen towel roll 10 can be more effectively suppressed.

[0032] (packaging film) In the kitchen towel roll package 1 according to this embodiment, the packaging film 2 used to package two kitchen towel rolls 10 is not particularly limited in material, but preferably contains at least one selected from the group consisting of polyethylene, polypropylene, polyester, polyamide, polycarbonate, polystyrene, and polyvinyl chloride, more preferably contains polyethylene and / or polypropylene, even more preferably is primarily polyethylene, and even more preferably is 100% polyethylene. The polyethylene material is not particularly limited, but is preferably HDPE, LDPE, LLDPE, or the like, and even more preferably LDPE, LLDPE, or a mixture thereof.

[0033] The thickness of the packaging film 2 is preferably 18 μm or more and 52 μm or less. The lower limit of the above range of the thickness of the packaging film 2 is more preferably 21 μm or more, and even more preferably 25 μm or more. The upper limit of the above range of the thickness of the packaging film 2 is more preferably 45 μm or less, and even more preferably 35 μm or less. The thickness of the packaging film 2 is measured in accordance with JIS K 7130. When the thickness of the packaging film 2 is equal to or greater than the above-mentioned lower limit, the packaging film 2 of the kitchen towel roll package 1 is more easily transported. Furthermore, such a kitchen towel roll package 1 can more effectively prevent deterioration of tightness. When the thickness of the packaging film 2 is equal to or less than the above-mentioned upper limit, the kitchen towel roll 10 packaged using the packaging film 2 can more effectively be prevented from becoming easily crushed.

[0034] The tensile strength of the packaging film 2 in the machine direction (MD) according to JIS Z 1702 is preferably 20 MPa or more and 70 MPa or less. The lower limit of the above range of the tensile strength of the packaging film 2 in the machine direction (MD) is more preferably 25 MPa or more, and even more preferably 30 MPa or more. The upper limit of the above range of the tensile strength of the packaging film 2 in the machine direction (MD) is more preferably 60 MPa or less, and even more preferably 55 MPa or less. The tensile strength of the packaging film 2 in the cross direction (CD) according to JIS Z 1702 is preferably 10 MPa or more and 55 MPa or less. The lower limit of the above range of the tensile strength of the packaging film 2 in the cross direction (CD) is more preferably 15 MPa or more, and even more preferably 20 MPa or more. The upper limit of the above range of the tensile strength of the packaging film 2 in the cross direction (CD) is more preferably 50 MPa or less, and even more preferably 45 MPa or less. Setting the tensile strength of the packaging film 2 within the above range tends to ensure that the kitchen towel roll package 1 is aesthetically pleasing (tight), resistant to crushing, and resistant to tearing when carried.

[0035] <Kitchen towel roll> FIG. 2 is a perspective view of the kitchen towel roll 10 according to this embodiment.

[0036] As shown in Figure 2, the kitchen towel roll 10 according to this embodiment is a kitchen towel roll 10 in which a kitchen towel sheet 10x is wound around a paper tube 20 (hereinafter also referred to as a core) and wound into a roll. Preferably, the kitchen towel sheet 10x is perforated in the width direction of the roll at approximately equal intervals in the winding direction of the roll (not shown).

[0037] 2, the surface of kitchen towel sheet 10x facing the outside of the roll is referred to as surface 10a (surface of kitchen towel sheet 10x), and the surface facing the center of the roll is referred to as back surface 10b (back surface of kitchen towel sheet 10x). Also, the edge of kitchen towel sheet 10x is referred to as outermost edge 10e of kitchen towel roll 10.

[0038] The kitchen towel roll 10 can be used, for example, as a roll of kitchen paper (sometimes called paper towel or cooking paper) used in home kitchens, restaurant kitchens, etc. to wipe away moisture or oil, remove dirt, etc. (kitchen paper roll), as well as other rolls of sanitary paper.

[0039] (winding length and winding diameter) The winding length of the kitchen towel roll 10 is preferably 18 m or more and 45 m or less. The lower limit of the above winding length range is more preferably 20 m or more, and even more preferably 24 m or more. The upper limit of the above winding length range is more preferably 40 m or less, and even more preferably 35 m or less. When the winding length is equal to or greater than the above lower limit, it is possible to more effectively prevent the roll density from decreasing in order to achieve a constant winding diameter DR, thereby more effectively preventing the kitchen towel roll 10 from being crushed. When the winding length is equal to or less than the above upper limit, it is possible to more effectively prevent the roll density from increasing in order to achieve a constant winding diameter DR, thereby more effectively preventing deterioration in the texture of the kitchen towel sheet 10x that becomes the kitchen towel roll 10.

[0040] The roll length is preferably measured as follows: First, the length of 10 sheets of kitchen towel sheets 10x between the perforations of kitchen towel roll 10 is measured. Next, the number of sheets in kitchen towel roll 10 is measured, and the roll length is calculated proportionally from the length of 10 sheets and the number of sheets. For example, if the length of 10 sheets is 1.80 m and the number of sheets is 150, the roll length is 1.80 m × (150 / 10) = 27 m. Note that if kitchen towel roll 10 does not have perforations, it is preferable to measure the roll length.

[0041] The roll diameter DR of the kitchen towel roll 10 according to this embodiment is 127 mm or more and 175 mm or less. When the roll diameter DR is equal to or greater than the above-mentioned lower limit, a decrease in the basis weight of the kitchen towel sheet 10x can be suppressed, thereby preventing a decrease in water absorbency. When the roll diameter DR is equal to or less than the above-mentioned upper limit, an increase in the contact area between the rolls can be prevented, preventing the kitchen towel roll 10 from being crushed. When the roll diameter DR exceeds the above-mentioned upper limit, the basis weight of the kitchen towel sheet 10x increases, resulting in lower costs. To further enhance the above-mentioned effects, the lower limit of the above-mentioned range of the roll diameter DR is preferably 135 mm or more, more preferably 140 mm or more. The upper limit of the above-mentioned range of the roll diameter DR is preferably 165 mm or less, more preferably 157 mm or less.

[0042] The roll winding diameter DR is measured using, for example, a diameter rule manufactured by Muratec KDS Co., Ltd. Two kitchen towel rolls 10 are measured, and the measurement results are averaged to obtain the value of the roll winding diameter DR.

[0043] (roll width and roll weight) The roll width of the kitchen towel roll 10 is preferably 150 mm or more and 380 mm or less. The lower limit of the above roll width range is more preferably 200 mm or more, and even more preferably 250 mm or more. The upper limit of the above roll width range is more preferably 340 mm or less, and even more preferably 300 mm or less. When the roll width is equal to or greater than the above lower limit, a decrease in the water absorption capacity per sheet of the kitchen towel sheet 10x can be more effectively prevented. When the roll width is equal to or less than the above upper limit, an unnecessary increase in the water absorption capacity per sheet of a highly absorbent kitchen towel sheet 10x such as that of this embodiment can be prevented, and as a result, an increase in costs can be more effectively prevented.

[0044] The roll weight of the kitchen towel roll 10 is preferably 200 g or more and 550 g or less. The lower limit of the above range of roll weight is more preferably 240 g or more, and even more preferably 260 g or more. The upper limit of the above range of roll weight is more preferably 490 g or less, and even more preferably 450 g or less. When the roll weight is equal to or greater than the above lower limit, it is possible to more effectively prevent the roll density from decreasing in order to achieve a constant winding diameter of the kitchen towel roll 10, thereby more effectively preventing roll crushing. When the roll weight is equal to or less than the above upper limit, it is possible to more effectively prevent the roll density from increasing in order to achieve a constant winding diameter of the kitchen towel roll 10, thereby more effectively preventing deterioration of the texture.

[0045] The roll weight is the weight per 280 mm of roll width, not including the core (paper tube 20) of the kitchen towel roll 10. If the roll width is not 280 mm, it is converted to the weight per 280 mm by proportional calculation.

[0046] (roll density) The roll density of the kitchen towel roll 10 according to this embodiment is 0.04 g / cm 3 More than 0.13g / cm 3 The lower limit of the above range of the roll density is more preferably 0.05 g / cm or less. 3More preferably, it is 0.06 g / cm 3 The upper limit of the above range of the roll density is more preferably 0.11 g / cm 3 More preferably, it is 0.09 g / cm or less. 3 If the roll density is equal to or greater than the above-mentioned lower limit, crushing of the kitchen towel roll 10 can be more effectively prevented. If the roll density is equal to or less than the above-mentioned upper limit, deterioration of the texture can be more effectively prevented.

[0047] Roll density is expressed as (roll weight) ÷ (roll volume). Roll weight is the weight of the kitchen towel roll 10 per 280 mm of roll width. Roll volume is expressed as [{cross-sectional area of ​​the roll's outer diameter (winding diameter DR)} - (cross-sectional area of ​​the cardboard core outer diameter DI of the cardboard core 20)] × roll width (converted per 280 mm). For example, if the roll weight (excluding the core) per 280 mm of roll width is 382 g, the winding diameter DR is 150 mm, and the cardboard core outer diameter DI is 39 mm, roll density = 382 g ÷ [{3.14 × (150 mm ÷ 2 ÷ 10) 2 -3.14×(39mm÷2÷10) 2}×(280mm÷10)]=0.08g / cm 3 This becomes:

[0048] (winding density) The winding density of the kitchen towel roll 10 according to this embodiment is 0.20 m / cm 2 More than 0.56m / cm 2 The lower limit of the above range of winding density is more preferably 0.24 m / cm or less. 2 More preferably, it is 0.30 m / cm 2 The upper limit of the above range of winding density is more preferably 0.50 m / cm 2 More preferably, it is 0.45 m / cm or less. 2When the winding density of kitchen towel roll 10 is equal to or greater than the above-mentioned lower limit, it is possible to more effectively prevent the roll density from decreasing, thereby more effectively preventing crushing of kitchen towel roll 10. When the winding density of kitchen towel roll 10 is equal to or less than the above-mentioned upper limit, it is possible to more effectively prevent the roll density from increasing, thereby more effectively preventing deterioration of texture.

[0049] The winding density is expressed as (winding length × number of plies) ÷ (cross-sectional area of ​​the roll). The cross-sectional area of ​​the roll is expressed as {cross-sectional area of ​​the outer diameter (winding diameter DR) part of the roll - (cross-sectional area of ​​the cardboard tube outer diameter DI part of the cardboard tube 20)}. For example, in the case of a winding length of 27 m, 2 plies, a winding diameter DR of 150 mm, and a cardboard tube outer diameter DI of 39 mm, the winding density = (27 m × 2) ÷ {3.14 × (150 mm ÷ 2 ÷ 10)} 2 -3.14×(39mm÷2÷10) 2}=0.33m / cm 2 This becomes:

[0050] (Rolling hardness) The tightness of the kitchen towel roll 10 is 1.0 mm or more and 5.0 mm or less. If the tightness of the kitchen towel roll 10 is less than the above-mentioned lower limit, the kitchen towel roll 10 will be too tightly wound, resulting in a poor texture. Furthermore, while the tightness and sealability will be good, the kitchen towel roll 10 and kitchen towel sheet 10x will be easily crushed, impairing their inherently good absorbency and softness. Packaging that is too tight may cause the packaging film 2 to tear from the center of the side (the middle part between the rolls) during transport. On the other hand, if the tightness of the kitchen towel roll 10 exceeds the above-mentioned upper limit, the kitchen towel roll 10 will be too loosely wound and will be easily crushed. To further enhance the above-mentioned effects, the lower limit of the above-mentioned range of tightness is preferably 1.5 mm or more, more preferably 2.0 mm or more. The upper limit of the above-mentioned range of tightness is preferably 4.0 mm or less, more preferably 3.0 mm or less.

[0051] The tightness of the roll of kitchen towel roll 10 is measured using a compression tester (handy compression tester KES-G5 manufactured by Kato Tech Co., Ltd.) as follows: First, kitchen towel roll 10 is placed horizontally on a hard table with its axis horizontal. Next, an acrylic plate (width 4 cm, long side length 29 cm, thickness 2 mm) is placed on top of kitchen towel roll 10 with the long side of the acrylic plate parallel to the width direction of the roll (approximately 280 mm). At this time, the weight of the acrylic plate is set to approximately 27 g so that the weight of the acrylic plate does not crush kitchen towel roll 10. Next, the compression element of the KES-G5 (area 2.0 cm) is placed at the center of the 4 cm width of the acrylic plate. 2 ) is pressed at a speed of 0.01 cm / sec. The pressure of the compressor pressing the acrylic plate is 1 gf / cm 2 The indentation depth when the pressure is 500gf / cm is T0. 2 The compression depth at this point is defined as Tm, and the difference between Tm and T0 (Tm - T0) is defined as the roll tightness. Next, kitchen towel roll 10 is rotated 90 degrees circumferentially around its central axis, and the compression depths Tm and T0 are measured in the same manner as above, to determine the difference between Tm and T0 (Tm - T0). In this way, by using an acrylic plate rather than directly compressing kitchen towel roll 10 with the compression element, it is possible to compress kitchen towel roll 10 across its entire width, making it possible to evaluate the crushability of kitchen towel roll 10 when packaged in packaging film 2. The above-mentioned two measurements are performed on two kitchen towel rolls 10, and the four measurement results are averaged to determine the roll tightness value. The physical property of roll hardness is a complex combination of multiple factors, such as the physical properties of the base paper (basis weight, thickness, raw material composition, compression characteristics such as cushioning in the thickness direction, surface properties, etc.), embossing (embossing shape, area, depth, etc.), and the degree of winding during winding, and since it is difficult to define each physical property individually, in this application it is defined as an index called roll hardness.

[0052] (paper tube) The kitchen towel roll 10 preferably has a paper tube 20 at its center that is parallel to the axial direction. The paper tube 20 is a core around which the kitchen towel sheet 10x is wound, and may be, for example, roughly cylindrical in cross section. The paper tube 20 is made of multiple layers of base paper, and preferably two layers. The paper used for the paper tube 20 preferably contains BKP (bleached Kraft pulp), and the BKP content is preferably 60% or more. The lower limit of the above range of the BKP (bleached Kraft pulp) content of the paper tube 20 is more preferably 70% or more, even more preferably 80% or more, and most preferably 95% or more. Among BKP, the content ratio of LBKP and NBKP is preferably LBKP:NBKP=50-100:0-50% by mass, more preferably LBKP:NBKP=70-100:0-30% by mass, even more preferably LBKP:NBKP=90-100:0-10% by mass, and most preferably LBKP:NBKP=95-100:0-5% by mass. When the BKP content of the paper tube 20 is equal to or greater than the above-mentioned lower limit and the LBKP and NBKP contents are within the above ranges, the decrease in strength of the paper tube 20 can be more effectively suppressed. Furthermore, when a thick kitchen towel sheet 10x, for example, as in this embodiment, is wound around the paper tube, the sheet can be tightly wound, which more effectively prevents the kitchen towel roll 10 from being crushed and improves the texture.

[0053] (Paper tube outer diameter) Furthermore, the cardboard tube outer diameter DI, which is the outer diameter of the cardboard tube 20 that forms the core of the kitchen towel roll 10, is preferably 28 mm or more and 58 mm or less. The lower limit of the above range of the cardboard tube outer diameter DI is more preferably 33 mm or more, and even more preferably 40 mm or more. The upper limit of the above range of the cardboard tube outer diameter DI is more preferably 53 mm or less, and even more preferably 46 mm or less. When the cardboard tube outer diameter DI is equal to or greater than the above lower limit, it is possible to more effectively prevent the roll density from decreasing when the kitchen towel roll 10 is wound to a constant winding diameter DR, thereby more effectively preventing the kitchen towel roll 10 from being crushed. When the cardboard tube outer diameter DI is equal to or less than the above upper limit, it is possible to more effectively prevent the roll density from increasing when the kitchen towel roll 10 is wound to a constant winding diameter DR, thereby more effectively preventing deterioration of the texture of the kitchen towel sheet 10x.

[0054] The outer diameter DI of the paper tube is measured, for example, using a diameter ruler manufactured by Muratec KDS Co., Ltd. Preferably, the measurement is performed by measuring two kitchen towel rolls 10 and averaging the measurement results.

[0055] <Kitchen towel sheet>

[0056] The kitchen towel sheet 10x according to this embodiment is made of 2 to 3 plies, and preferably 2 plies.

[0057] (Basic weight) The basis weight per product ply of the kitchen towel sheet 10x according to this embodiment is 30 g / m 2 More than 56g / m 2The following is true. If the basis weight per product ply is below the above-mentioned lower limit, the water absorbency of the kitchen towel sheet 10x will be poor. Furthermore, if the basis weight exceeds the above-mentioned upper limit, the cost will be poor. Furthermore, if the basis weight exceeds the upper limit, the roll diameter DR will be increased to maintain a constant roll density. Furthermore, as the roll diameter DR increases, the contact area between rolls increases, resulting in greater damage to the kitchen towel roll 10. Basis weight can be measured based on JIS P 8124, but the basis weight per product ply refers to the basis weight measured without changing (without removing or increasing) the number of plies of the kitchen towel sheet 10x. From the perspective of further improving the above-mentioned effects, the lower limit of the above-mentioned range of basis weight per product ply is preferably 34 g / m. 2 More preferably, it is 38 g / m or more. 2 The upper limit of the above range of basis weight per product ply is preferably 50 g / m 2 or less, more preferably 46 g / m 2 The following is the result.

[0058] (Water absorption) In this embodiment, the water absorption per unit area of ​​the kitchen towel sheet 10x is 300 g / m 2 More than 610g / m 2 or less. If the water absorption per unit area is below the above-mentioned lower limit, the water absorption of the kitchen towel sheet 10x will be poor. If the water absorption per unit area exceeds the above-mentioned upper limit, the basis weight of the kitchen towel sheet 10x will be high, resulting in poor cost performance. Furthermore, if the water absorption per unit area exceeds the above-mentioned upper limit, the basis weight of the kitchen towel sheet 10x will be high, and the roll diameter DR will be large to achieve a certain roll density. Furthermore, if the roll diameter DR is increased, the contact area between the rolls will increase, resulting in greater damage to the kitchen towel roll 10. From the perspective of further improving the above-mentioned effects, the lower limit of the above-mentioned range of water absorption per unit area is preferably 350 g / m 2 More preferably, it is 380 g / m or more. 2 The lower limit of the above range of water absorption per unit area is preferably 550 g / m 2More preferably, it is 500 g / m or less. 2 The following is the result.

[0059] Furthermore, the water absorption per unit weight of the kitchen towel sheet 10x is preferably 6.0 g / g or more. The lower limit of the above range of water absorption per unit weight is more preferably 8.0 g / g or more, and even more preferably 10.0 g / g or more. The upper limit of the above range of water absorption per unit weight is preferably 14.0 g / g or less, and more preferably 13.0 g / g or less. When the water absorption per unit weight is equal to or greater than the above-mentioned lower limit, a decrease in the water absorption of the kitchen towel sheet 10x can be more effectively prevented.

[0060] FIG. 7 is a diagram showing a method for measuring the water absorption of the kitchen towel sheet of the embodiment.

[0061] When the kitchen towel sheet 10x is two-ply, the water absorption of each sheet is measured as follows. First, a two-ply kitchen towel sheet 10x is taken and cut using a square template with each piece measuring 7.6 cm (3 inches) to prepare a rectangular test piece 200 with each side measuring 7.6 cm. The weight 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).

[0062] Next, distilled water is poured into a commercially available tray to a depth of 2 cm, and the test piece 200 set in the holder 220 is immersed in the distilled water for 2 minutes. After immersion for 2 minutes, the test piece 200 and holder 220 are removed from the distilled water, and as shown in FIG. 7, a strip 210 is attached to one corner 200d of the test piece 200. The strip 210 is made by peeling the same two-ply kitchen towel as the kitchen towel to be measured into one ply, cutting this paper kitchen towel into a piece measuring 2 mm x 15 mm, and attaching it to a portion of the test piece 200 6 mm from the corner 200d toward the center. Next, the holder 220 and test piece 200 are hung from a rod placed in an empty water tank with the corner 200a opposite corner 200d facing up, and the tank lid is closed and left for 15 minutes.

[0063] Thereafter, the holder 220 and the test piece 200 are taken out of the water tank, the band 210 and the holder 220 are removed, and the weight of the test piece 200 is measured using an electronic balance. From the change in weight of the test piece 200 before and after immersion in distilled water, the amount of distilled water absorbed per unit area of ​​the test piece 200 (g of water / sheet m 2 , 1m 2 Hit. Abbreviated as g / m 2 ) is calculated. Furthermore, the water absorption per unit area (g of water / sheet m 2 ) by the basis weight of the product ply of the test piece 200 to obtain the water absorption per unit area (water g / sheet m 2 ) / basis weight (sheet g / sheet m 2 ) = Water absorption per unit weight (g of water / g of sheet, per 1g. Abbreviated as g / g). Measurements are carried out five times for each sample, and the average value is used.

[0064] When the kitchen towel sheet 10x is a 3-ply sheet, it is preferable to measure it in the same manner as when it is a 2-ply sheet. This measurement is carried out in accordance with JIS P 8111 at a temperature of 23±1°C and humidity of 50±2%. The distilled water is kept at 23±1°C.

[0065] (embossed pattern) The kitchen towel roll 10 (kitchen towel sheet 10x) of this embodiment is preferably embossed and has an embossed pattern (has an embossed pattern applied). The kitchen towel sheet 10x is preferably embossed as a single-ply sheet, and then laminated to two or more plies. When laminating, it is preferable to use, for example, plybond glue (adhesive) and apply the glue for adhesion. Water may also be used instead of plybond glue (adhesive).

[0066] It is preferable to apply the plybond glue to the backside of the embossed portion of the sheet on the front surface 10a of the two-ply kitchen towel sheet 10x (between the sheet on the front surface 10a and the sheet on the back surface 10b of the two-ply), and then laminate the two sheets together. In the case of a three-ply kitchen towel sheet, it is possible to emboss two layers on the front surface 10a and apply glue to the backside of the middle layer, or to emboss one layer on the front surface 10a and apply glue to the backside of the layer on the front surface 10a. Of these, it is preferable to emboss two layers on the front surface 10a and apply glue to the backside of the middle layer.

[0067] The ply on the front surface 10a of the kitchen towel sheet 10x preferably has an embossed pattern. By providing an embossed pattern on the front surface 10a, glue can be applied to the embossed portion and two or more plies can be laminated. The sheet on the back surface 10b may have (or have) an embossed pattern, but preferably does not. The absence of an embossed pattern on the back surface 10b makes the kitchen towel sheet 10x (kitchen towel roll 10) less susceptible to crushing. The embossed pattern is not particularly limited as long as it is a pattern commonly used on kitchen towels, such as a dotted or linear pattern, but a linear embossed pattern is preferred. A linear embossed pattern can more effectively prevent damage when rolls rub against each other.

[0068] FIG. 3 is a diagram showing an example of an embossing pattern on a kitchen towel roll according to an embodiment.

[0069] The linear embossing pattern is not particularly limited, but a pattern such as that shown in Fig. 3 is preferred. Specifically, one pattern may include two of two types of figures: a roughly circular figure with another design inside, and a figure that is roughly line-symmetrical (may have a tilt) in the vertical and horizontal directions as a whole and includes a combination of multiple curves and figures, but the shape of the figures is not particularly limited. For the roughly circular figure, it is preferred that the roughly circular figure be doubled.

[0070] Furthermore, with regard to the dimensions of the embossed pattern, it is preferable that the rectangle E (E is not the embossed pattern) surrounding the embossed pattern be a square with sides of 2 cm to 25 cm. The lower limit of the above range for rectangle E is more preferably a square with sides of 5 cm or more, and even more preferably a square with sides of 8 cm or more. The upper limit of the above range for rectangle E is more preferably a square with sides of 20 cm or less, and even more preferably a square with sides of 15 cm or less. The vertical direction of rectangle E is preferably parallel to the winding direction of kitchen towel roll 10, and the horizontal direction is preferably parallel to the width direction of kitchen towel roll 10, although they may be tilted. Using such a pattern can further improve the water absorption capacity of a kitchen towel sheet 10x with high water absorption capacity. Furthermore, using a linear embossed pattern can more effectively suppress damage caused by rubbing between rolls.

[0071] In this case, for linear embossing patterns with a thickness of 0.1 mm to 4 mm and a length of 5 mm or more, the total length of the embossing added together is 50 cm / 100 cm. 2 More than 550cm / 100cm 2 The lower limit of the above range of the total length is more preferably 80 cm / 100 cm. 2 More preferably, it is 110cm / 100cm or more. 2 The upper limit of the above range of the total length is more preferably 410 cm / 100 cm. 2 More preferably, it is 300cm / 100cm or less. 2 The total length is measured by adding up the lengths of all embossments that are 0.1 mm to 4 mm in thickness and 5 mm or longer inside a rectangle E that includes all of the embossed patterns as shown in Figure 3. And, 100 cm 2The total length per square is calculated. The size of one side of this rectangle E can be changed as appropriate depending on the size of the embossed pattern. If the rectangle that contains all the embossed patterns contains an embossed pattern adjacent to an embossed pattern contained within the rectangle, the length of the adjacent embossed pattern is also measured and included in the total length.

[0072] Furthermore, if the size of one side of rectangle E cannot be clearly determined by the embossing pattern, the size of rectangle E is set to 10 x 10 cm, and the total length of the embossments included in this rectangle E is measured. By setting the total length within the above-mentioned range, the water absorption capacity of the highly absorbent kitchen towel sheet 10x of this embodiment can be further improved. Furthermore, damage caused by rubbing between rolls can be more effectively suppressed. The total length is measured using a ruler or tape measure as described above, but it can also be measured using a general microscope.

[0073] In the embossing pattern, the embossing depth is preferably 0.06 mm or more and 1.05 mm or less. The lower limit of the above range of the embossing depth is more preferably 0.10 mm or more, and even more preferably 0.14 mm or more. The upper limit of the above range of the embossing depth is more preferably 0.55 mm or less, and even more preferably 0.35 mm or less. When the embossing depth is equal to or greater than the above lower limit, shallow embossing can be more effectively prevented, and as a result, crushing of the kitchen towel roll 10 can be more effectively prevented. Furthermore, shallow embossing can more effectively prevent weakening of the adhesion between the plies (i.e., more effectively prevent weakening of the shape retention between the sheets), and more effectively prevent damage caused by rubbing between rolls during packaging. Furthermore, when the embossing depth is equal to or less than the above upper limit, deterioration of the texture can be more effectively prevented. Furthermore, large surface irregularities can be more effectively prevented, and damage caused by rubbing between rolls during packaging can be more effectively prevented.

[0074] The depth of the embossment is measured, for example, using a microscope. A microscope such as the KEYENCE One-Shot 3D Measuring Macroscope VR-3100 can be used. Software such as the VR-H1A can be used for observing, measuring, and analyzing microscope images. Measurement conditions are a magnification of 25x and a field of view of 12mm x 9mm. The measurement magnification and field of view can be changed as needed depending on the desired size of the embossment.

[0075] FIG. 4 is a diagram showing the height profile on the XY plane as measured by a microscope using shading, FIG. 5 is a diagram showing the height profile on the XY plane as measured by a microscope using a graph, and FIG. 6 is a diagram showing how to determine the embossing depth for an embossing pattern.

[0076] Figure 4 shows a height profile on the XY plane taken with a microscope, with the height of the surface of the kitchen towel sheet 10x represented by shading. The linear areas in Figure 4 that are shading different from the surrounding area represent individual embossments. The depth of the embossment is determined by measuring the height difference of the embossment using the microscope.

[0077] The measurement is preferably performed on the surface 10a side of the kitchen towel sheet 10x. Furthermore, when measuring, three turns of the kitchen towel sheet 10x are removed from the kitchen towel roll 10, and the fourth turn of the kitchen towel sheet 10x is used to measure the sheet without changing the number of plies. If there are any perforations, these are avoided during the measurement.

[0078] First, a line segment AB is drawn as shown in Figure 4, and the height profile shown in Figure 5 is obtained. Note that the line segment AB should be drawn so that it crosses the embossments. The line segment AB is drawn in the roll width direction (CD direction) of the kitchen towel sheet 10x. However, if the spacing between embossments is narrow, for example, 2 mm or less, and the height of the convex portions described below becomes low, the line segment may be drawn diagonally or in the roll winding direction R.

[0079] The height profile is a (measured) cross-sectional curve S that represents the unevenness of the actual sample surface of the kitchen towel sheet 10x. However, the (measured) cross-sectional curve S also contains noise (steep peaks due to fiber clumps, whisker-like fibers, and fiber-free areas on the surface of the kitchen towel sheet 10x). When calculating the height difference of the unevenness, it is necessary to remove such noise peaks.

[0080] Therefore, the (measured) profile curve S in FIG. 5 was smoothed by setting the filter size of the weighted average radio button to ±12 to obtain the profile curve W in FIG. 6. Smoothing using the filter of the weighted average radio button can be automatically performed using the analysis software described above. Then, in the graph shown in FIG. 6, the average of the maximum values ​​on the vertical axis of the convex portion H1 (first maximum portion) and the convex portion H2 (second maximum portion) sandwiching the concave portion D1 (minimum portion) adjacent to the convex portion H1 is calculated, and the minimum value on the vertical axis of the concave portion D1 (minimum portion) sandwiched between the convex portions H1 and H2 is determined. When determining the concave portions and convex portions, for example, if it can be confirmed from the embossing pattern in FIG. 3 that adjacent embossments have the same width, the concave portions and convex portions should be selected while keeping in mind that the distance between the concave portion D1 and the convex portion H1 or the distance between the concave portion D2 and the convex portion H3 or the distance between the concave portion D2 and the convex portion H4 is approximately equal. If it is not possible to confirm from the embossing pattern in Figure 3 that adjacent embossings have the same width (for example, if the thickness or spacing of adjacent embossings in the applied embossing pattern is different), select the recessed and protruding portions while checking the embossing pattern in Figure 3 and the image in Figure 4 showing the height profile on the XY plane in shades of gray. The value obtained by subtracting the minimum value from the average value of the maximum values ​​thus obtained is taken as the provisional emboss depth.

[0081] Furthermore, as shown in Figure 6, similar measurements are taken at two consecutive locations on the cross-sectional curve (the recess D1 and the recess D2 sandwiched between the protrusions H3 and H4) (two consecutive locations at this point). Then, the kitchen towel roll 10 is rotated three times by 90 degrees in the direction of the roll of the kitchen towel sheet 10x, and similar measurements are taken at each position (four measurement locations in the direction of the roll). The average value of the eight locations (2 x 4) is then used as the final embossing depth.

[0082] The kitchen towel sheet 10x according to this embodiment preferably has a concave-convex pattern derived from the papermaking process, which is different from the embossed pattern. By having a concave-convex pattern derived from the papermaking process, which is different from the embossed pattern, the kitchen towel sheet 10x can have better water absorption. Furthermore, the kitchen towel roll 10 obtained by winding up such a kitchen towel sheet 10x is less likely to be crushed. The method for applying the concave-convex pattern derived from the papermaking process will be described later.

[0083] Furthermore, because of the unevenness pattern resulting from the papermaking process, there is variation in the height of the convex portions on either side of the concave portion. Therefore, if the difference in the vertical axis between the convex portions sandwiching the concave portion (for example, convex portions H3 and H4 sandwiching concave portion D2) is 0.2 mm or more, measurements are taken at a location that avoids that portion.

[0084] The back surface 10b of the kitchen towel sheet 10x is not particularly limited as to whether it has an embossed pattern, as long as it has a pattern of protrusions and recesses derived from the papermaking process that is different from the embossed pattern. The back surface 10b may have a nested embossing or pin-to-pin embossing, or may not have an embossing, but preferably has a nested embossing or no embossing, and more preferably has no embossing.

[0085] Conventional kitchen towels ensure water absorption using pin-to-pin or nested paper types, but when thick base paper is used, embossing can cause the paper to become crushed, reducing water absorption. For this reason, it is preferable that the front surface 10a of the kitchen towel sheet 10x according to this embodiment has linear embossing and the back surface 10b has no embossing.

[0086] (seat length) The sheet length between perforations (the length of the kitchen towel sheet 10x in the roll winding direction) is preferably 100 mm or more and 250 mm or less. The lower limit of the above-mentioned sheet length range is more preferably 130 mm or more, and even more preferably 150 mm or more. The upper limit of the above-mentioned sheet length range is more preferably 230 mm or less, and even more preferably 210 mm or less. When the sheet length is equal to or greater than the above-mentioned lower limit, the decrease in the water absorption capacity per sheet of the kitchen towel sheet 10x can be more effectively suppressed. When the sheet length is equal to or less than the above-mentioned upper limit, the increase in the cost per sheet can be more effectively suppressed.

[0087] (specific volume) The specific volume of 10x kitchen towel sheets is 7cm 3 / g or more 23cm 3 The lower limit of the above range of the specific volume of the kitchen towel sheet 10x is preferably 9 cm 3 / g or more, more preferably 12 cm 3 The upper limit of the specific volume of the kitchen towel sheet 10x is preferably 20 cm 3 / g or less, and more preferably 17 cm 3 / g or less. When the specific volume of the kitchen towel sheet 10x is equal to or greater than the above-mentioned lower limit, the decrease in the water absorbency of the kitchen towel sheet 10x can be more effectively prevented. Also, when the specific volume of the kitchen towel sheet 10x is equal to or less than the above-mentioned upper limit, the kitchen towel roll 10 can be more effectively prevented from being crushed. The specific volume is calculated by dividing the paper thickness per ply of the kitchen towel sheet 10x by the basis weight per ply, and is expressed as the volume cm per unit g. 3 It is expressed as:

[0088] (paper thickness) The paper thickness of the kitchen towel sheet 10x is preferably 2.0 mm or more and 4.0 mm or less per 10 sheets. The lower limit of the above-mentioned paper thickness range is more preferably 2.3 mm or more per 10 sheets, and even more preferably 2.6 mm or more per 10 sheets. The upper limit of the above-mentioned paper thickness range is more preferably 3.6 mm or less per 10 sheets, and even more preferably 3.3 mm or less per 10 sheets. When the paper thickness is equal to or greater than the above-mentioned lower limit, the decrease in water absorbency of the kitchen towel sheet 10x can be more effectively prevented. When the paper thickness is equal to or less than the above-mentioned upper limit, the increase in cost can be more effectively prevented. Furthermore, when the paper thickness is equal to or less than the above-mentioned upper limit, the increase in the winding diameter DR required to maintain a constant roll density and specific volume can be more effectively prevented. Furthermore, since the increase in the winding diameter DR can be more effectively prevented, the increase in the contact area between rolls can be more effectively prevented, and damage to the kitchen towel roll 10 can be more effectively prevented.

[0089] The paper thickness can be measured using a thickness gauge (a dial thickness gauge "PEACOCK" manufactured by Ozaki Seisakusho Co., Ltd.). The measurement conditions are a measurement load of 38 gf / cm 2 The gauge diameter is 30 mm, and the sample is placed between the gauge and the measuring table. The gauge is read when the gauge is lowered at a speed of 1 mm per second or less. The sample is 10 sheets of 10x kitchen towel sheets (5 pairs for 2-ply, 3 pairs for 3-ply, and the value is proportionally calculated to 10 pairs). The measurement is also repeated 10 times at different points, and the measurement results are averaged.

[0090] The paper thickness per product ply of the kitchen towel sheet 10x is preferably 0.40 mm or more and 0.80 mm or less. The lower limit of the above range of paper thickness per product ply is more preferably 0.45 mm or more, and even more preferably 0.50 mm or more. The upper limit of the above range of paper thickness per product ply is more preferably 0.72 mm or less, and even more preferably 0.68 mm or less. When the paper thickness per product ply is above the above lower limit, the decrease in water absorbency of the kitchen towel sheet 10x can be more effectively prevented. When the paper thickness per product ply is below the above upper limit, the increase in the winding diameter DR required to maintain a constant roll density and specific volume can be more effectively prevented. Furthermore, since the increase in the winding diameter DR can be more effectively prevented, the increase in the contact area between rolls can be more effectively prevented, and damage to the kitchen towel roll 10 can be more effectively prevented. The paper thickness per product ply is determined by proportionally calculating the paper thickness values ​​for 10 sheets described above per product ply.

[0091] (DMDT, DCDT and GMT) The dry machine direction tensile strength (DMDT) of the kitchen towel sheet 10x in the dry state according to JIS P 8113 is preferably 6 N / 25 mm or more and 13 N / 25 mm or less. In this case, the machine direction refers to the MD direction (roll winding direction). The lower limit of the above range of DMDT is more preferably 7 N / 25 mm or more, and even more preferably 8 N / 25 mm or more. The upper limit of the above range of DMDT is more preferably 12 N / 25 mm or less, and even more preferably 11 N / 25 mm or less.

[0092] Furthermore, the dry cross direction tensile strength (DCDT) of the kitchen towel sheet 10x according to JIS P 8113 is preferably 6 N / 25 mm or more and 13 N / 25 mm or less. In this case, the cross direction refers to the CD direction (roll width direction). The lower limit of the above DCDT range is more preferably 7 N / 25 mm or more, and even more preferably 8 N / 25 mm or more. The upper limit of the above DCDT range is more preferably 12 N / 25 mm or less, and even more preferably 11 N / 25 mm or less.

[0093] Furthermore, the GMT (Geometric Mean Tensile strength), which is the square root of the product of DMDT and DCDT, is preferably 6 N / 25 mm or more and 13 N / 25 mm or less. The lower limit of the above range of GMT is more preferably 7 N / 25 mm or more, and even more preferably 8 N / 25 mm or more. The upper limit of the above range of GMT is more preferably 12 N / 25 mm or less, and even more preferably 11 N / 25 mm or less.

[0094] When the DMDT, DCDT, or GMT is above the above-mentioned lower limit, the decrease in the basis weight of the kitchen towel sheet 10x can be more effectively suppressed, and the decrease in water absorbency can be more effectively suppressed. Furthermore, damage to the kitchen towel roll 10 can be more effectively prevented. When the DMDT, DCDT, or GMT is below the above-mentioned upper limit, the increase in the basis weight of the kitchen towel sheet 10x can be more effectively suppressed, and cost increases can be more effectively suppressed. Furthermore, because the increase in the basis weight of the kitchen towel sheet 10x can be more effectively suppressed, the increase in the winding diameter DR required to maintain a constant roll density of the kitchen towel roll 10 can be more effectively suppressed. This more effectively prevents an increase in the contact area between rolls, and more effectively prevents damage to the kitchen towel roll 10. The DMDT and DCDT of the kitchen towel sheet 10x are measured in accordance with JIS P 8113, and the GMT is calculated from the square root of the product of the measured DMDT and DCDT.

[0095] Furthermore, the ratio of DMDT to DCDT (DMDT / DCDT) is preferably 0.9 or more and 1.3 or less. The lower limit of the above range of the ratio (DMDT / DCDT) is more preferably 1.0 or more. The upper limit of the above range of the ratio (DMDT / DCDT) is more preferably 1.2 or less, and even more preferably 1.1 or less. When the ratio is equal to or more than the lower limit or equal to or less than the upper limit, deterioration of the balance of strength in the MD and CD can be more effectively suppressed, and increased damage caused by rubbing between rolls during packaging can be more effectively prevented.

[0096] The kitchen towel sheet 10x preferably contains wet pulp. The wet pulp content is preferably 60% or more. The lower limit of the above range of wet pulp content is more preferably 70% or more, and even more preferably 80% or more. A kitchen towel sheet 10x containing wet pulp has better water absorption than one containing dry pulp. Furthermore, since the strength of the kitchen towel sheet 10x can be easily increased, crushing of the kitchen towel roll 10 can be more effectively prevented. When the wet pulp content is at or above the lower limit, the strength of the kitchen towel sheet 10x can be easily increased, and crushing of the kitchen towel roll 10 can be more effectively prevented.

[0097] As the pulp, for example, softwood bleached kraft pulp (NBKP), hardwood bleached kraft pulp (LBKP), etc. can be used, and the content ratio thereof is preferably NBKP:LBKP=20-80% by mass:20-80% by mass, more preferably NBKP:LBKP=30-70% by mass:30-70% by mass, and even more preferably NBKP:LBKP=40-60% by mass:40-60% by mass.

[0098] <Method of manufacturing kitchen towel roll packaging> The kitchen towel roll package 1 is a film-packaged kitchen towel roll 10, which is formed by winding up the kitchen towel sheet 10x as described above, and is arranged adjacent to each other so that the axial directions of the two rolls are parallel.

[0099] The kitchen towel roll packaging 1 can be produced, for example, in the following order: (1) papermaking and creping, (2) embossing, (3) roll winding, and (4) film wrapping of two rolls. Note that TAD papermaking technology is preferably used in the production (papermaking) process of the kitchen towel sheet 10x.

[0100] FIG. 8 is a diagram showing a part of the papermaking process for the kitchen towel sheet of the embodiment.

[0101] In this case, it is preferable that a concave-convex pattern derived from the papermaking process (fabric), different from the above-mentioned embossed pattern, is applied to the kitchen towel sheet 10x in the papermaking process. By having this concave-convex pattern, the water absorption capacity of the kitchen towel sheet 10x can be further increased.

[0102] Here, "originating from the papermaking process" means that the unevenness is imparted between the head box of the papermaking machine and the outlet of the Yankee dryer 32 during the papermaking process of the kitchen towel sheet 10x. Specifically, in part of the papermaking process shown in Figure 8, the unevenness can be imparted in the press section 30, which is arranged between the dewatering roll 31 and the Yankee dryer 32. In the press section 30, the wet paper 34 and the uneven fabric 33 (the uneven fabric 33 loops between the press section 30 and the Yankee dryer 32) are pressed together, thereby imparting an uneven pattern to the wet paper 34.

[0103] The uneven pattern can be changed as needed by changing the fabric pattern (fine pattern, coarse pattern). Changing the uneven pattern will change the specific volume (paper thickness), but it is preferable to select a pattern that will bring the specific volume (paper thickness) of the base paper within the numerical range described below.

[0104] When a base paper made using this through-air dryer is used, it is pressed by an embossing roll to form an embossed pattern. In this case, the area ratio of the protrusions on the embossing roll (i.e., the area ratio of the embossed pattern in the produced kitchen towel sheet 10x) is preferably 4% or more and 30% or less. The lower limit of the above range of the protrusion area ratio is more preferably 6% or more, and even more preferably 8% or more. The upper limit of the above range of the embossed pattern area ratio is more preferably 25% or less, and even more preferably 15% or less. When the area ratio is equal to or greater than the above lower limit, weakening of the ply adhesion of the kitchen towel sheet 10x can be more effectively prevented, and damage to the kitchen towel roll 10 can be more effectively prevented. As a result, crushing of the kitchen towel roll 10 can be more effectively prevented. When the area ratio is equal to or less than the above upper limit, deterioration of the texture of the kitchen towel sheet 10x can be more effectively prevented. Furthermore, a decrease in the water absorbency of the kitchen towel sheet 10x can be more effectively suppressed.

[0105] The shape of the protrusions and embossments on the embossing roll can be any shape, including circles, ellipses, rectangles, squares, floral patterns, logos, letters, etc., but as mentioned above, linear embossments are preferred. As mentioned above, the embossments are preferably provided only on the surface 10a of the kitchen towel sheet 10x.

[0106] Furthermore, the area ratio of the convex portions on the embossing roll may not always completely match the area ratio of the embossed pattern because the base paper stretches after embossing or the measurement conditions for the area of ​​the embossed pattern vary. However, since this is within the range of measurement error, the area ratio of the convex portions on the embossing roll can basically be regarded as the area ratio of the embossed pattern.

[0107] In addition, in the case of (4) film packaging, the packaging form of the packaging film 2 is preferably caramel packaging as shown in Fig. 1. It is also preferable that the packaging form is gusset packaging (not shown).

[0108] When the packaging is caramel packaging, the equipment and process used are not particularly limited as long as they are known packaging equipment and processes capable of producing caramel packaging. For example, two kitchen towel rolls 10 are placed on a sheet-like packaging film 2, and the packaging film 2 is then wrapped around the kitchen towel roll 10 to form a cylindrical shape. Alternatively, two kitchen towel rolls 10 are inserted coaxially into one axial end of a pre-formed cylindrical packaging film 2. It is then preferable to fold two opposing flap-shaped edges of the packaging film 2 extending beyond both ends of the two kitchen towel rolls 10 toward each other, and then similarly fold two other opposing flap-shaped edges toward each other, and then seal (heat seal) these folded portions by heat fusion or the like. In other words, it is preferable that the packaging film 2 has heat sealing properties that allow it to be heat-sealed.

[0109] When the packaging is gusset packaging, there are no particular limitations on the equipment or process used, as long as they are known packaging equipment or processes capable of gusset packaging. For example, it is preferable to gusset package two kitchen towel rolls 10 with packaging film 2 made of polyethylene so that it conforms to the surface shape of the roll product, thereby producing a two-roll package (kitchen towel roll package 1). [Example]

[0110] The present invention will be explained in more detail with reference to the following examples and comparative examples, but the present invention is not limited to these examples in any way.

[0111] The kitchen towel roll packages of Examples 1 to 16 and Comparative Examples 1 to 7 were manufactured through the following steps: (1) papermaking and creping (Comparative Example 7 did not use a TAD, but instead used a general Yankee dryer (YD)), (2) embossing, (3) roll winding, and (4) film packaging. The kitchen towel roll packages of all Examples and Comparative Examples were measured for each parameter according to the methods described above, and the following evaluations were also performed according to the methods described above. The embossing was only performed on the front side of the kitchen towel sheet, and the package consisted of two kitchen towel rolls arranged adjacent to each other with their axial directions parallel to each other and wrapped in film.

[0112] (Water absorption) The "water absorbency" was evaluated by measuring the amount of water absorbed per unit area of ​​the kitchen towel sheet after production and rating it on a 5-point scale. The evaluation criteria are as follows: ◎: Water absorption capacity is 380g / m 2 That was all. ○: Water absorption is 350g / m 2 More than 380g / m 2 It was less than. △: Water absorption is 300g / m 2 More than 350g / m 2 It was less than. ×: Water absorption is 250g / m 2 More than 300g / m 2 It was less than. ××: Water absorption is 250g / m 2 It was less than.

[0113] (Cost by basis weight) The "cost based on basis weight" was evaluated by measuring the basis weight per product ply of the kitchen towel sheet after production and evaluating it on a four-point scale. The evaluation criteria are as follows: ◎: Basis weight is 46g / m 2 It was as follows. ○: Basis weight is 46 g / m 2 More than 50g / m 2 It was as follows. △: Basis weight is 50g / m 2Over 56g / m 2 It was as follows. ×: Basis weight is 56 g / m 2 It exceeded that.

[0114] (Roll texture) The "texture of the kitchen towel roll" was evaluated by 30 monitors who sensorily evaluated the texture of the kitchen towel roll, choosing either "good texture" or "poor texture," and rating it on a 5-point scale based on the number of people who answered "good texture." ◎: 29 or more people felt that the texture was good. ○: The number of people who felt that the texture was good was 27 or more and 28 or less. △: The number of people who felt that the texture was good was 25 or more and 26 or less. ×: The number of people who felt that the texture was "good" was 23 or more and 24 or less. XX: The number of people who felt that the texture was "good" was 22 or less.

[0115] (Roll crush resistance) Thirty monitors each held one of the two kitchen towel roll packages in one hand, at the center of its height. They then shook it up and down 50 times at a speed of 1 / second, and then horizontally 50 times at a speed of 1 / second. After that, the packaging film was removed, and each monitor visually inspected both kitchen towel rolls to evaluate their resistance to crushing. Each monitor evaluated the rolls' resistance to crushing, selecting either "the roll is crushed" or "the roll is not crushed," and rating them on a four-point scale based on the number of people who felt the rolls were crushed. The evaluation criteria were as follows: ◎: The number of people who felt that the role was being crushed was between 0 and 2. ○: The number of people who felt that the role was broken was between 3 and 5. △: The number of people who felt that the role was broken was between 6 and 10. ×: 11 or more people felt that the role was broken.

[0116] (Tightness of packaging) The "tightness of the packaging" was evaluated by 30 monitors who sensorily evaluated the tightness of the packaging, choosing either "good tightness" or "poor tightness," and rating it on a four-point scale based on the number of people who answered "good tightness." ◎: 28 or more people felt that the packaging was tight. ○: The number of people who felt that the packaging was tight was between 25 and 27. △: The number of people who felt that the packaging was tight was between 21 and 24. ×: The number of people who felt that the packaging was tight was 20 or less.

[0117] The results obtained are shown in Tables 1 and 2.

[0118] [Table 1]

[0119] [Table 2]

[0120] From the above, it was at least confirmed that the kitchen towel roll of this example is a kitchen towel roll package that has good packaging tightness, excellent water absorbency and cost of the sheet, good texture, and is resistant to crushing of the roll. [Explanation of symbols]

[0121] 1. Kitchen towel roll packaging 2. Packaging film 10 kitchen towel rolls 10a surface 10b back side 10e The outermost edge of a kitchen towel roll 10x kitchen towel sheets 20 paper tube 30 Press Department 31 Dewatering roll 32 Yankee Dryer 33 Textured Fabric 34 Wet Paper 200 specimens 200a,200d Corner 210 Obi 220 Holder

Claims

1. A kitchen towel roll package is formed by winding up two or three plies of kitchen towel sheets into a roll, and packaging two rolls of the rolls in film so that the axial directions of the rolls are substantially parallel to each other. The kitchen towel sheet has a basis weight per product ply of 30 g / m ２ 56g / m or more ２ Hereinafter, the water absorption per unit area is 300 g / m ２ 610g / m or more ２ is as follows: The kitchen towel roll has a winding diameter of 127 mm or more and 175 mm or less, and a winding tightness of 1.0 mm or more and 5.0 mm or less, When the kitchen towel roll package is placed so that the axial directions of the two kitchen towel rolls are horizontal, a first stainless steel ruler having a mass of 64 g, a thickness of 1.0 mm, a width of 25 mm, and a scale length of 300 mm is placed across the two adjacent kitchen towel rolls in a first direction perpendicular to the axial direction, with its plate surface in contact with the packaging film to serve as a reference line, and a second stainless steel ruler having a mass of 64 g, a thickness of 1.0 mm, a width of 25 mm, and a scale length of 300 mm is placed on the packaging film between the two adjacent kitchen towel rolls, perpendicular to the packaging film with the width direction of the second ruler aligned with the first direction, the depth to which the packaging film sinks due to the weight of the second ruler relative to the reference line is 3 mm to 20 mm.

2. The roll density of the kitchen towel roll is 0.04 g / cm ３ 0.13g / cm or more ３ 2. The kitchen towel roll package of claim 1, wherein:

3. 3. The kitchen towel roll package according to claim 1, wherein the percentage of the actual circumference of the packaging film relative to the theoretical circumference of the packaging film calculated from the winding diameter of the kitchen towel roll ((actual film circumference / theoretical circumference of packaging film) x 100(%)) is 94% or more and 101% or less.

4. 3. The kitchen towel roll package according to claim 1, wherein the film packaging is a caramel packaging.

5. 3. The kitchen towel roll package according to claim 1, wherein the film packaging is a gusset packaging.

6. 3. The kitchen towel roll package according to claim 1, wherein the kitchen towel sheet has an uneven pattern derived from the papermaking process, which is different from the embossed pattern.

7. The specific volume of the kitchen towel sheet is 7 cm ３ / g or more 23cm ３ 3. The kitchen towel roll package according to claim 1, wherein the elastic modulus is 1 / g or less.

8. 3. The kitchen towel roll package according to claim 1, wherein the paper thickness per 10 sheets of the kitchen towel sheets is 2.0 mm or more and 4.0 mm or less per 10 sheets.

9. 3. The kitchen towel roll package according to claim 1, wherein the roll length of the kitchen towel roll is 18 m or more and 45 m or less.

10. 3. The kitchen towel roll packaging according to claim 1, wherein the kitchen towel sheet has an embossed pattern, and the embossed area ratio of the embossed pattern is 4% or more and 30% or less.

11. 3. The kitchen towel roll package according to claim 1, wherein the product of the roll density of the kitchen towel roll and the percentage of the actual circumference of the packaging film relative to the theoretical circumference of the film is 4 or more and 12 or less.

12. 3. The kitchen towel roll package according to claim 1, wherein the kitchen towel sheet has an embossed pattern, but the back side does not have the embossed pattern.

13. 3. The kitchen towel roll package according to claim 1, wherein the thickness of the packaging film is 18 μm or more and 52 μm or less.

14. 3. The kitchen towel roll package according to claim 1, wherein the kitchen towel sheet contains wet pulp, and the wet pulp content is 60% or more.

15. 3. The kitchen towel roll package according to claim 1, wherein the kitchen towel roll has a paper tube at its center that is parallel to the axial direction, and the paper tube has a BKP content of 60% or more.

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