Method for manufacturing roll-shaped paper towel packaging

Abstract

To provide a manufacturing method of a rolled paper towel package which makes a film hard to be torn when being carried, is easy to carry and excellent in aesthetic properties due to its appropriate tightness, makes rolled paper towels in the package hard to be crushed, and can stably hold the rolled paper towels in the package, in the rolled paper towel package in which two 4-roll packages are wrapped.SOLUTION: A manufacturing method of a rolled paper towel package includes a process of inserting rolled paper towels into a 4-roll first film, and performing sealing and gusset packaging, and a process of inserting two 4-roll packages into a second film, and performing sealing and gusset packaging. An inclination angle of a first gusset fold part is 15° or more and 50° or less, and an inclination angle of a second gusset fold part is 25° or more and 55° or less. A dimension ratio between a width direction and a depth direction is 1.5:1 or more and 2.6:1 or less. A roll firmness of the rolled paper towel is 2 mm or more and 10 mm or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing an 8-roll roll paper towel package. [Background technology]

[0002] BACKGROUND ART Conventionally, a roll product package in which a plurality of roll products such as toilet rolls or kitchen towel rolls are packaged has been known, which is formed by folding a gusset (also called a gusset) symmetrically into a cylindrical film such as polyethylene to form a main body.

[0003] For such gusset packages, appropriate consideration has been given to the tightness and specifications of the contents in order to make the film less likely to tear during transport and to make the package aesthetically pleasing. Also known is a double package in which a plurality of such packages are further gusset-wrapped.

[0004] As a prior art document relating to roll product packaging, for example, Patent Document 1 describes a sanitary paper roll package in which an even number of sanitary paper rolls are wrapped in a film, and the sanitary paper rolls have a roll length of 15 to 60 m and a roll density of 0.10 to 0.21 g / cm. 3 The sanitary paper roll package has a film thickness of 18 to 45 μm, sanitary paper rolls arranged in two rows in a direction P perpendicular to their axial direction L, the sanitary paper roll package is placed so that the axial direction is horizontal, a first ruler is placed across two adjacent rows of sanitary paper rolls with its plate surface in contact with the film to serve as a reference line, and a second ruler is then placed on top of the packaged film spanning the two rows of sanitary paper rolls so that the width direction of the second ruler is perpendicular to the axial direction, and the maximum indentation amount D of the film, measured as the distance from the reference line to the tip of the second ruler, is 3 to 25 mm.

[0005] Patent Document 2 also describes a roll product package in which a plurality of roll products, each of which is made by wrapping a two-ply sheet of sanitary thin paper, are stored in a packaging bag, and the roll products are arranged in a row of two with the axial direction vertical, and two rows are stacked and gusset-packaged in the packaging bag, and the packaging bag has gripping parts that extend upward from the long sides in a gable roof shape and are joined together, the roll product has a winding length of 63 to 103 m, the mass of one roll including the core is 200 to 370 g, and (mass of the four roll products in the packaging bag) / (basis weight of the film) is 25 to 80 (g / (g / m 2 )), in which the inclination angle θ of the packaging bag from the long side to the gripping portion is 25 to 45 degrees, and the distance between the long sides is 105 to 134 mm.

[0006] Furthermore, Patent Document 3 discloses a toilet roll package in which a plurality of toilet rolls individually wrapped in a resin film are arranged in two rows with their circumferential surfaces butted together between an upper fused portion and a lower fused portion in a gusset package, and the upper fused portion and the lower fused portion are positioned opposite the circumferential surface of the toilet rolls, and the package has a base end portion where an easy tear-open line is arranged to extend in the vertical direction in an area located closer to the upper fused portion than the adjacent position of a pair of toilet rolls located closest to the upper fused portion of the outer film, and a pair of expanding portions arranged from a position close to the side of this base end portion so that the distance between the easy tear-open lines gradually increases as they move toward the lower fused portion, and an opening start portion that is approximately convex toward the upper fused portion is formed. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 2018-090270 [Patent Document 2] Patent No. 6590596 [Patent Document 3] Patent Publication No. 2021-054520 Summary of the Invention [Problem to be solved by the invention]

[0008] However, in a double package (outer package) in which multiple conventional roll product packages (inner packages) are further packaged, if the size of the outer package (film tightness) is too large relative to the size of the inner package, the roll product will collapse inside the outer package, resulting in poor stability when transported. Conversely, if the size of the outer package is too small relative to the size of the inner package, the inner and outer packages will rub against each other during packaging, leading to packaging defects, reduced aesthetic appeal, and film tearing during transport. Furthermore, if the roll product is wrapped too loosely, the inner film will not be tight enough and the product will be less portable. Conversely, if the wrap is too tight, the inner film will be tight enough, but the roll product will have a lower paper thickness and absorbency, resulting in lower quality.

[0009] Thus, with a double package (outer package) in which multiple conventional roll product packages (inner packages) are further packaged, it has been difficult to achieve high levels of portability, tear resistance and aesthetic appeal of the package, ability to hold the internal roll product, and resistance to crushing of the roll product. This tendency is particularly pronounced with roll paper towels, particularly nonwoven roll towels, because each roll is large and heavy.

[0010] The present invention has been made in consideration of the above circumstances, and its object is to provide a method for manufacturing a roll paper towel package in which a package containing four roll paper towels is packed, and in which two roll paper towels are packed together, the film is less likely to tear when carried, the package has a moderate tightness that makes it easy to carry and aesthetically pleasing, the roll paper towels inside the package are less likely to be crushed, and the roll paper towels can be stably held inside the package. [Means for solving the problem]

[0011] The present inventors have conducted extensive research and have found that, in a method for manufacturing a roll paper towel package in which two four-roll packages are packaged in a specified process, by specifying the numerical ranges for the inclination angle of the first gusset fold in the four-roll package and the inclination angle of the second gusset fold in the roll paper towel package, and further specifying the width-to-depth dimensional ratio of the roll paper towel package, the tightness of the roll paper towel winding, and the ratio of the weight of two four-roll packages to the basis weight of the second film, a package in which four roll paper towels are packaged, and even a roll paper towel package in which two roll paper towels are packaged, can be produced in which the film is less likely to tear when carried, has an appropriate tightness that makes it easy to carry and has excellent aesthetic appeal, the roll paper towels inside the package are less likely to be crushed, and the roll paper towels can be stably held within the package, thereby solving the above-mentioned problems and leading to the completion of the present invention. Specifically, the present invention provides the following:

[0012] (1) A first aspect of the present invention is a method for producing a four-roll package by gusset packaging, comprising the steps of inserting a total of four rolls of rolled paper towels, two rolls in the vertical direction and two rolls in the horizontal direction, into a cylindrical first film sealed at one end, with all rolls aligned in the axial direction, and sealing the other end, and inserting two of the four-roll packages into a cylindrical second film sealed at one end, with the axial directions of the rolled paper towels arranged approximately parallel to the height direction and four rolls aligned in the width direction, in order, from the other end, and sealing the other end, to produce a four-roll package by gusset packaging. a first gusset fold in the four-roll package having an inclination angle of 15° or more and 50° or less, a second gusset fold in the roll-shaped paper towel package having an inclination angle of 25° or more and 55° or less, a width-to-depth dimensional ratio at the bottom of the roll-shaped paper towel package being 1.5:1 or more and 2.6:1 or less, a tightness of winding of the roll-shaped paper towel being 2 mm or more and 10 mm or less, and (weight of the four-roll package × 2 / basis weight of the second film) being 30 (g / (g / m 2 )) or more 100(g / (g / m 2 )) A method for producing a roll-shaped paper towel package, characterized in that:

[0013] (2) A second aspect of the present invention is a method for manufacturing a roll-shaped paper towel package as described in (1), characterized in that the width of the roll-shaped paper towel package is 400 mm or more and 480 mm or less, the depth is 190 mm or more and 260 mm or less, and the height is 260 mm or more and 300 mm or less.

[0014] (3) A third aspect of the present invention is a method for manufacturing a roll-shaped paper towel package according to (1) or (2), characterized in that the width of the four-roll package is 190 mm or more and 240 mm or less, the depth is 190 mm or more and 240 mm or less, and the height is 255 mm or more and 295 mm or less.

[0015] (4) A fourth aspect of the present invention is a method for manufacturing a roll-shaped paper towel package according to any one of (1) to (3), wherein the four-roll package has a first seal portion including a handle portion formed by gusset packaging, and the roll-shaped paper towel package has a second seal portion formed by gusset packaging, and in the step of inserting two of the four-roll packages into the second film, the direction in which the first seal portion extends and the direction in which the four-roll packages are inserted are approximately perpendicular, and the axial direction of the roll-shaped paper towel and the direction in which the second seal portion extends are approximately parallel.

[0016] (5) A fifth aspect of the present invention is a method for producing a roll-shaped paper towel package according to any one of (1) to (4), wherein the roll weight excluding the core of the roll-shaped paper towel is 100 g or more and 550 g or less, the wound length is 7 m or more and 24 m or less, and the roll density is 0.05 g / cm 3 More than 0.19g / cm 3 It is characterized by the following:

[0017] (6) A sixth aspect of the present invention is a method for producing a roll-shaped paper towel package according to any one of (1) to (5), characterized in that the thickness of the second film is 25 μm or more and 60 μm or less. [Effects of the Invention]

[0018] According to the present invention, a roll paper towel package can be provided in which a package containing four roll paper towels, or a roll paper towel package containing two more roll paper towels, has a film that is less likely to tear when carried, has a moderate tightness that makes it easy to carry and has excellent aesthetic appeal, the roll paper towels inside the package are less likely to be crushed, and the roll paper towels can be stably held inside the package. [Brief explanation of the drawings]

[0019] [Figure 1] 1A to 1C are diagrams illustrating steps in a method for manufacturing a roll-shaped paper towel package of the present invention. [Figure 2] 1 is a perspective view showing the entire roll-shaped paper towel package manufactured by the manufacturing method of the present invention. [Figure 3] FIG. 1 is a perspective view showing the entirety of one four-roll package included in the roll-shaped paper towel package manufactured by the manufacturing method of the present invention. [Figure 4] 1 is a perspective view showing the entirety of one roll of paper towel contained in a roll of paper towel packaging produced by the production method of the present invention. [Figure 5] 1A and 1B are a side view showing the side of a four-roll package manufactured by the manufacturing method of the present invention, and a plan view showing the top view of a roll-shaped paper towel package. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, modes for carrying out the present invention (hereinafter simply referred to as "embodiments") will be described in detail. The following embodiments are examples for explaining the present invention, and are 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. In the drawings, the same elements are given the same reference numerals, and redundant explanations are omitted. Furthermore, unless otherwise specified, the positional relationships, such as up, down, left, and right, are based on the positional relationships shown in the drawings. Furthermore, the dimensional ratios of the drawings are not limited to those shown. Furthermore, the width direction of the package is the direction indicated by the symbol X in the drawings, the depth direction of the package is the direction indicated by the symbol Y in the drawings, and the height direction of the package is the direction indicated by the symbol Z in the drawings.

[0021] 1. Manufacturing method for roll-shaped paper towel packaging Figure 1 is a diagram showing steps in a method for manufacturing a roll-shaped paper towel package 100 in one embodiment of the present invention. The following description will be given with reference to Figures 1(a) to 1(d). 1(a) and 1(b), rolled paper towels 1, in which paper towels 1x are wound into a roll, are first inserted into a cylindrical first film 11, one end of which is sealed, from the other end, with all four rolls aligned axially, as shown in FIG. 1(a) and 1(b), and the other end is sealed to produce a 4-roll package 10 using gusset packaging. Note that in FIG. 1(b), the 4-roll package 10 is erected so that the axial direction of the rolled paper towels 1 is approximately parallel to the height direction (Z-axis direction), but to simplify the process, the step shown in FIG. 1(c) may be carried out with the axial direction of the rolled paper towels 1 remaining approximately parallel to the depth direction (with the 4-roll package 10 lying on its side). Next, as shown in Figures 1(c) and 1(d), two 4-roll packages 10 are arranged so that the axial direction of the rolled paper towels 1 is approximately parallel to the height direction (Z-axis direction) and four are lined up in the width direction (X-axis direction), and then inserted into a cylindrical second film 12 with one end sealed, one after the other, and the other end is sealed to package the rolled paper towels in a gusset package, producing the rolled paper towel package 100. The roll-shaped paper towel package 100, the four-roll package 10, and the roll-shaped paper towel 1 produced by the production method of the present invention will be described in detail below.

[0022] 2.Paper towel roll packaging 2 is a perspective view showing the entire roll paper towel package 100 produced by the manufacturing method of the present invention. The roll paper towel package 100 of the present invention includes a four-roll package 10 in which rolled paper towels 1x are wound into a roll, two rolls in the width direction and two rolls in the depth direction, a total of four rolls, all with their axes oriented in the height direction, packaged in a gusset package by a first film 11, and a second film 12 which packages the entire package in a gusset package with two four-roll packages 10 and four rolls of paper towels 1 arranged side by side in the width direction.

[0023] In this case, the width of the roll-shaped paper towel package 100 is preferably 400 mm to 480 mm, the depth is 190 mm to 260 mm, and the height is 260 mm to 300 mm, more preferably 420 mm to 470 mm, the depth is 200 mm to 250 mm, and the height is 265 mm to 295 mm, and even more preferably 430 mm to 460 mm, the depth is 210 mm to 240 mm, and the height is 270 mm to 290 mm. By having the dimensions of the roll-shaped paper towel package 100 in each direction within the above numerical ranges, the roll-shaped paper towel 1 can be stably held within the package, making it easy to carry and providing a roll-shaped paper towel package 100 with excellent decorative properties. Furthermore, the width-to-depth dimensional ratio at the bottom of roll-shaped paper towel package 100 is 1.5:1 or more and 2.6:1 or less, preferably 1.6:1 or more and 2.4:1 or less, and more preferably 1.7:1 or more and 2.2:1 or less. Having the width-to-depth dimensional ratio within the above range allows the roll-shaped paper towel 1 to be stably held within the package, resulting in a roll-shaped paper towel package 100 that is easy to carry and has excellent decorative properties.

[0024] The material of the second film 12 is not particularly limited, but is preferably polyethylene, polypropylene, polyester, polyamide, polycarbonate, polystyrene, or polyvinyl chloride, more preferably polyethylene or polypropylene, even more preferably a material primarily made of polyethylene, and most preferably 100% polyethylene. Furthermore, the thickness of the second film 12 is preferably 25 μm to 60 μm, more preferably 30 μm to 51 μm, and even more preferably 35 μm to 47 μm. If the thickness is less than 25 μm, the second film 12 is prone to tearing. If the thickness exceeds 60 μm, packaging defects are more likely to occur, and the aesthetic appeal of the roll-shaped paper towel package 100 is poor. The film thickness is measured in accordance with JIS K 7130. The basis weight of the second film 12 is 20 g / m 2 More than 53g / m 2 Preferably, it is 30 g / m or less. 2 More than 48g / m 2 More preferably, it is 35 g / m or less. 2 More than 43g / m 2 It is more preferable that:

[0025] 3.4 Roll packaging 3 is a perspective view showing the entirety of one four-roll package 10 included in the roll paper towel package 100 of the present invention. The four-roll package 10 is a gusset package in which roll paper towels 1, each consisting of paper towels 1x wound into a roll, are packaged in a state where a total of four rolls, two rolls in the width direction and two rolls in the depth direction, are all oriented with their axes in the height direction, using first film 11. In this case, the width of the 4-roll package 10 is preferably 190 mm to 240 mm, the depth is preferably 190 mm to 240 mm, and the height is preferably 255 mm to 295 mm, the width is more preferably 200 mm to 233 mm, the depth is 200 mm to 233 mm, and the height is preferably 260 mm to 290 mm, and the width is still more preferably 210 mm to 226 mm, the depth is 210 mm to 226 mm, and the height is preferably 265 mm to 285 mm. By having the dimensions in each direction within the above numerical ranges, the 4-roll package 10 has an appropriate tightness, which allows the rolled paper towels 1 inside to be stably held, the rolled product to be less likely to be crushed, and a rolled paper towel package 100 with excellent aesthetics can be obtained.

[0026] The material of first film 11 is not particularly limited, but is preferably the same as that of second film 12. Furthermore, the thickness of first film 11 is preferably 20 μm or more and 55 μm or less, more preferably 25 μm or more and 45 μm or less, and even more preferably 30 μm or more and 40 μm or less. Having a thickness within the above numerical range allows for roll-shaped paper towel package 100 to be obtained that can stably hold roll-shaped paper towel 1 within the package. The basis weight of the first film 11 is not particularly limited, but is preferably 13 g / m 2 More than 39g / m 2 Preferably, it is 18 g / m or less. 2 More than 33g / m 2 More preferably, it is 22 g / m or less. 2 More than 27g / m 2 It is more preferable that:

[0027] 1, 2, and 3, the four-roll package 10 has a first sealed portion 111 including a handle portion 113 formed by gusset packaging, and the rolled paper towel package 100 has a second sealed portion 121 formed by gusset packaging, and in the step of inserting two four-roll packages 10 into the second film 12, it is preferable that the extension direction (Y-axis direction) of the first sealed portion 111 and the insertion direction (X-axis direction) of the four-roll package 10 are approximately perpendicular, and that the axial direction (Z-axis direction) of the rolled paper towel 1 and the extension direction (Z-axis direction) of the second sealed portion 121 are approximately parallel. By inserting the four-roll package 10 into the rolled paper towel package 100 in this manner, the rolled paper towel package 100 can be made to be able to stably hold the rolled paper towel 1 within the package.

[0028] The weight of the 4-roll package 10x2 is preferably 650 g to 1900 g, more preferably 850 g to 1600 g, and even more preferably 950 g to 1450 g. In this case, the weight of the 4-roll package 10x2 is the weight of the roll-shaped paper towel package 100 minus the weight of the second film 12. Furthermore, (weight of the 4-roll package 10 × 2 / basis weight of the second film 12) is 30 (g / (g / m 2 )) or more 100(g / (g / m 2 )) or less, and 40 (g / (g / m 2 )) or more 80(g / (g / m 2 )) or less, and 45 (g / (g / m 2 )) or more 70(g / (g / m 2 ) or less. By having (weight of 4 roll packages 10 x 2 / basis weight of second film 12) within the above range, the roll-shaped paper towel package 100 can be made such that the second film 12 is less likely to tear.

[0029] 5(a) is a side view showing the side of the four-roll package 10, and FIG. 5(b) is a plan view showing the roll paper towel package 100 as viewed from above. In this case, the inclination angle θ1 of the first gusset fold 112 in the four-roll package 10 shown in FIG. 5(a) is 15° to 50°, preferably 20° to 45°, and more preferably 25° to 40°. Furthermore, the inclination angle θ2 of the second gusset fold 122 in the roll paper towel package 100 shown in FIG. 5(b) is 25° to 55°, preferably 30° to 50°, and more preferably 35° to 45°. When the inclination angles θ1 and θ2 are both within the above numerical ranges, the roll paper towel package 100 can be made to be easy to carry, have excellent aesthetic appeal, be resistant to crushing of the roll paper towel 1 within the package, and be able to stably hold the roll paper towel 1 within the package.

[0030] The method for measuring the inclination angle θ1 of the first gusset fold 112 is to first gently lift up the first sealed portion 111 of the four-roll packaging body 10. At this time, if the first sealed portion 111 has a handle 113, use the handle 113. Then, 10 seconds after lifting, measure the length of the oblique side of the first gusset fold 112 with a ruler while still lifting it. At this time, the length of the hypotenuse of the first gusset fold 112 is measured by measuring the shortest length (distance) on each side of the first film 11, which is wrapped along the circumference of the cross section of the rolled paper towel 1, from the point where the first sealed portion 111 no longer comes into contact with the rolled paper towel 1 when the first sealed portion 111 is lifted to the first sealed portion 111, and the average value is used as the length (PL-1) of the hypotenuse of the first gusset fold 112. Furthermore, the height (H-1) of the first gusset fold 112 from the apex (first sealed portion 111) when the first sealed portion 111 is lifted to the flat portion formed along the rolled paper towel 1 is actually measured. Finally, using these values, the inclination angle θ1 is calculated from sin θ1 = H-1 / PL-1. In addition, the method for measuring the inclination angle θ2 of the second gusset fold portion 122 is similar to the above method, except that the roll-shaped paper towel packaging 100 and the second seal portion 121 are used, and the length of the hypotenuse of the second gusset fold portion 122 (PL-2) and the height (H-2) of the second gusset fold portion 122 are measured, and finally, these values ​​are used to calculate the inclination angle θ2 from sinθ2 = H-2 / PL-2.

[0031] In this case, PL-1 is preferably 110 mm or more and 170 mm or less, more preferably 115 mm or more and 160 mm or less, and even more preferably 120 mm or more and 145 mm or less. H-1 is preferably 30 mm or more and 130 mm or less, more preferably 40 mm or more and 115 mm or less, and even more preferably 50 mm or more and 110 mm or less. PL-2 is preferably 115 mm or more and 195 mm or less, more preferably 125 mm or more and 175 mm or less, and even more preferably 135 mm or more and 160 mm or less. H-2 is preferably 50 mm or more and 160 mm or less, more preferably 65 mm or more and 135 mm or less, and even more preferably 80 mm or more and 115 mm or less. Since PL-1 and H-1, and PL-2 and H-2 are all within the above numerical ranges, the inclination angle θ1 and the inclination angle θ2 can each be within the above numerical ranges, resulting in a roll paper towel package 100 that is easy to carry, has excellent aesthetic appeal, is less likely to crush the roll paper towel 1 within the package, and can stably hold the roll paper towel 1 within the package.

[0032] 3. Rolled paper towels 4 is a perspective view showing the entirety of one roll of paper towel 1 included in the roll of paper towel package 100 of the present invention. The roll of paper towel 1 of the present invention is a roll of paper towel 1x wound into a roll. Preferably, the paper towel 1x is perforated in the CD (width) direction at equal intervals in the MD (machine direction) from the outermost wound edge 1e of the paper towel 1x (not shown). In this case, the MD (Machine Direction) direction is the direction in which the paper towel 1x is wound (the direction in which the paper towel 1x is manufactured, also called the flow direction), and the CD (Cross Direction) direction is the direction perpendicular to the MD direction (also called the width direction). The paper towel 1x of the present invention can be used as various paper products, and is preferably used as a wiper or kitchen towel, more preferably as a kitchen towel. Furthermore, although the present invention is a paper towel used as a wiper or kitchen towel, it may also be used as a nonwoven towel.

[0033] 4, the surface of the paper towel 1x facing the outside of the roll is referred to as surface 1a (surface of the paper towel 1x), and the surface facing the center of the roll is referred to as back surface 1b (back surface of the paper towel 1x). When hydroentangling, which will be described later, is performed, it is preferable that the amount of synthetic fibers contained in the paper towel 1x be high on the surface side of the paper towel 1x (i.e., the surface 1a side) and low on the back surface 1b side.

[0034] (winding length and winding diameter) The roll length of the rolled paper towel 1 is preferably 7 m or more and 24 m or less, more preferably 10 m or more and 22 m or less, and even more preferably 13 m or more and 18 m or less. When the roll length is within the above range, the rolled paper towel 1 is wound with an appropriate tightness, and both the first film 11 and the second film 12 have an appropriate tightness, so that the rolled paper towel 1 is less likely to be crushed, and a rolled paper towel package 100 can be obtained that is easy to carry, has an attractive appearance, and is excellent in terms of holding the rolled paper towel 1. The roll diameter DR of the rolled paper towel 1 is preferably 75 mm or more and 160 mm or less, more preferably 100 mm or more and 140 mm or less, and even more preferably 108 mm or more and 130 mm or less.

[0035] The roll length is measured using the following method. First, the length of 10 sheets of paper towels 1x, which form the sheets between the perforations on the roll of paper towels 1, is measured. Next, the number of paper towels 1x on the roll of paper towels 1 is measured, and the roll length is calculated proportionally from the length of 10 sheets and the number of paper towels 1x. For example, if the length of 10 sheets is 1.80m and there are 150 paper towels 1x, the roll length is 1.80m x (150 / 10) = 27m. The roll diameter DR is measured using a diameter rule manufactured by Muratec KDS Corporation. Ten rolls of paper towels 1 are measured, and the measurement results are averaged. If there are no perforations, the roll length is measured.

[0036] (Rolling firmness) Furthermore, the tightness of the roll of paper towel 1 is 2 mm to 10 mm, preferably 3 mm to 9 mm, and more preferably 4 mm to 8 mm. When the tightness of the roll of paper towel 1 is within the above range, the roll of paper towel 1 is wound with an appropriate tightness, and both the first film 11 and the second film 12 have an appropriate tightness, so that the roll of paper towel 1 is less likely to be crushed, and a roll of paper towel package 100 can be obtained that is easy to carry, has an attractive appearance, and is excellent in terms of holding the roll of paper towel 1.

[0037] (roll width and roll weight) The roll width of the roll-shaped paper towel 1 is preferably 180 mm or more and 350 mm or less, more preferably 210 mm or more and 325 mm or less, and even more preferably 240 mm or more and 300 mm or less. Furthermore, the roll weight excluding the core of the rolled paper towel 1 is preferably 100 g to 550 g, more preferably 160 g to 430 g, and even more preferably 200 g to 400 g. By keeping the roll weight within the above numerical range, a rolled paper towel package 100 can be obtained in which both the first film 11 and the second film 12 are resistant to tearing. The roll weight is the weight of one roll per 280 mm of roll width, not including the core (core paper tube). If the roll width is not 280 mm, it is converted to the weight per 280 mm by proportional calculation. The roll weight of the rolled paper towel 1, including the core, is preferably 110 g to 570 g, more preferably 170 g to 450 g, and even more preferably 210 g to 420 g.

[0038] (roll density) The roll density of rolled paper towel 1 is 0.05 g / cm 3 More than 0.19g / cm 3 Preferably, it is 0.07 g / cm or less. 3 More than 0.17g / cm 3More preferably, it is 0.09 g / cm or less. 3 More than 0.15g / cm 3 With the roll density within the above range, the rolled paper towel 1 is wound with an appropriate tightness, and both the first film 11 and the second film 12 have an appropriate tightness, so that the rolled paper towel 1 is less likely to be crushed, and the rolled paper towel package 100 can be made to be easy to carry, have an attractive appearance, and be excellent in terms of holding the rolled paper towel 1.

[0039] The roll density is expressed as (roll weight) ÷ (roll volume). The roll weight is the weight of rolled paper towels 1 per 280 mm of roll width. The roll volume is expressed as [{cross-sectional area of ​​the roll outer diameter (winding diameter DR)} - (cross-sectional area of ​​the core outer diameter DI)] × roll width (converted per 280 mm). For example, if the roll weight (excluding the core) per 280 mm of roll width is 330 g, the winding diameter DR is 120 mm, and the core outer diameter DI is 38 mm, the roll density = 0.12 g / cm 3 If the rolled paper towel 1 does not have a core, the diameter of the hollow part in the center is the core outer diameter DI.

[0040] (Core outer diameter) Furthermore, the core outer diameter DI, which is the outer diameter of the core (core paper tube) of the rolled paper towel 1 of the present invention, is preferably 25 mm or more and 55 mm or less, more preferably 32 mm or more and 47 mm or less, and even more preferably 36 mm or more and 42 mm or less. When the core outer diameter DI is within the above numerical range, it becomes easier to adjust the winding diameter DR of the rolled paper towel 1, the rolled paper towel 1 is wound with an appropriate tightness, and both the first film 11 and the second film 12 have an appropriate tightness, so the rolled paper towel 1 is less likely to be crushed, and a rolled paper towel package 100 can be obtained that is easy to carry, has an attractive appearance, and is excellent in terms of holding the rolled paper towel 1. The core outer diameter DI is measured using a diameter rule manufactured by Muratec KDS Co., Ltd. Measurements are made on 10 rolls of paper towels 1, and the measurement results are averaged. In the case of a roll of paper towels 1 without a core, the diameter of the hollow space in the center of the roll of paper towels 1 is considered to be the core outer diameter DI.

[0041] 4. Paper towels In the roll-shaped paper towel 1 of the present invention, the paper towel 1x contains pulp fibers, but when it is made into a nonwoven towel, it may further contain synthetic fibers. Common pulp fibers such as softwood bleached kraft pulp (NBKP) and hardwood bleached kraft pulp (LBKP) can be used as the pulp fibers. The NBKP to LBKP content ratio in the pulp fibers is preferably NBKP:LBKP = 50:50 to 100:0, more preferably NBKP:LBKP = 70:30 to 100:0, even more preferably NBKP:LBKP = 90:10 to 100:0, and most preferably NBKP:LBKP = 100:0. Preferred NBKP fibers include those made from radiata pine, slash pine, southern pine, lodgepole pine, spruce, and Douglas fir. It is also possible to use NUKP instead of NBKP, and LUKP instead of LBKP. Examples of synthetic fibers include nylon, vinylon, polyester, acrylic, polyethylene, polypropylene, and polystyrene, with polyethylene and polypropylene being preferred, and polypropylene being more preferred. There are no limitations on the nonwoven fabric used as the synthetic fiber, but spunbond nonwoven fabric is preferred.

[0042] When paper towel 1x is a nonwoven fabric towel, the proportion (content) of synthetic fiber in paper towel 1x is preferably 5% to 50%, more preferably 9% to 41%, and even more preferably 12% to 28%. Furthermore, the proportion (content) of pulp fiber in paper towel 1x is preferably 50% to 95%, more preferably 59% to 91%, and even more preferably 72% to 88%. By having both the proportion of synthetic fiber and the proportion of pulp fiber within the above numerical ranges, paper towel 1x and roll-shaped paper towel 1 can be easily used as nonwoven fabric towels.

[0043] Furthermore, it is preferable that the paper towel 1x contains a general wet strength agent. The content of the wet strength agent (in terms of solid content (active ingredient)) relative to the pulp fiber (bone dry) is preferably 0.05% to 1.0%, more preferably 0.1% to 0.5%, and even more preferably 0.2% to 0.4%. If necessary, the paper towel 1x may contain a heat stabilizer, a lubricant, etc., as long as the purpose of the present invention is not impaired. Examples of heat stabilizers include phenolic stabilizers such as BHT (2,6-di-t-butyl-4-methylphenol).

[0044] (Basic weight) The basis weight of one paper towel (total basis weight of synthetic fiber and pulp fiber) is not particularly limited, but is preferably 40 g / m 2 More than 150g / m 2 Preferably, it is 48 g / m or less. 2 More than 110g / m 2 More preferably, it is 55 g / m or less. 2 More than 80g / m 2 It is more preferable that the basis weight of the paper towel 1x is within the above range. When the basis weight of the paper towel 1x is within the above range, the paper towel 1x and the rolled paper towel 1 can be made easy to use, whether they are paper towels or nonwoven fabric towels.

[0045] The basis weight of the synthetic fiber contained in 1x paper towel is not particularly limited, but is preferably 4 g / m 2 More than 40g / m 2 Preferably, it is 7 g / m or less. 2 More than 30g / m 2 More preferably, it is 10 g / m or less. 2 More than 20g / m 2 Furthermore, the basis weight of the pulp fiber contained in the paper towel 1x is not particularly limited, but is preferably 33 g / m or less. 2 More than 120g / m 2 Preferably, it is 38 g / m or less. 2 More than 90g / m 2 More preferably, it is 45 g / m or less. 2 More than 75g / m 2 It is more preferable that the basis weight of the synthetic fiber and the basis weight of the pulp fiber are both within the above ranges, thereby making it possible to obtain paper towels 1x and roll-shaped paper towels 1 that are easy to use as nonwoven fabric towels. The basis weight of paper towel 1x is measured in accordance with JIS P 8124. However, since it is difficult to measure the basis weight of the synthetic fiber and pulp fiber individually after hydroentanglement, as described below, they are measured, for example, by the following method.

[0046] First, prepare a 0.1 M acetic acid solution and a 0.1 M sodium acetate solution. Mix approximately 830 g of the 0.1 M acetic acid solution with approximately 160 g of the 0.1 M sodium acetate solution to adjust the pH to 4. This is the acetate buffer solution. Add Cellulase Onozuka p1500 (manufactured by Yakult Pharmaceutical Co., Ltd.) to this acetate buffer solution so that the amount added is 1 wt%. 50 ml of acetate buffer containing Cellulase Onozuka P1500 and 0.5 g of one paper towel were placed in a vial and tightly capped. After shaking at 180 rpm and 40°C for 24 hours, the synthetic fiber was sampled from the vial and its mass was measured. The basis weights of the synthetic fiber and pulp fiber were calculated using the mass (0.5 g) of one paper towel (including synthetic fiber and pulp fiber) and the mass of the sampled synthetic fiber using the following formula: Synthetic fiber basis weight = Basis weight of 1 paper towel x (mass of synthetic fiber / mass of 1 paper towel) Pulp fiber basis weight = Basis weight of 1 paper towel x [(mass of 1 paper towel - mass of synthetic fiber) / mass of 1 paper towel]

[0047] (paper thickness) The thickness of the paper towel 1x is preferably 200 μm or more and 1400 μm or less, more preferably 400 μm or more and 1200 μm or less, and even more preferably 500 μm or more and 1000 μm or less. By having the thickness of the paper towel 1x within the above numerical range, it is possible to produce paper towels 1x and roll-shaped paper towels 1 that are easy to use, whether they are paper towels or nonwoven towels. The paper thickness is measured using a thickness gauge (a dial thickness gauge "PEACOCK" manufactured by Ozaki Seisakusho Co., Ltd.). The measurement conditions are a measurement load of 3.7 kPa, a probe diameter of 30 mm, a sample placed between the probe and the measuring table, and the gauge reading when the probe is lowered at a speed of 1 mm per second or less. The measurement is repeated 10 times and the measurement results are averaged. The measurement is performed by stacking three paper towels 1x, and the value is divided by one-third to obtain the paper thickness value.

[0048] (seat length) The sheet length of the paper towel 1x is preferably 160 mm or more and 330 mm or less, more preferably 180 mm or more and 305 mm or less, and even more preferably 200 mm or more and 280 mm or less. When the sheet length of the paper towel 1x is within the above numerical range, it is possible to obtain a paper towel 1x and a roll-shaped paper towel 1 that are easy to use, whether they are paper towels or nonwoven towels. The sheet length is the actual measurement value of the length in the MD direction of one paper towel 1x between perforations of the roll-shaped paper towel 1.

[0049] As for the manufacturing method of paper towel 1x and rolled paper towel 1, if paper towel 1x is a kitchen towel containing synthetic fibers and pulp fibers, it can be manufactured, for example, in the following order: (1) laminating pulp fibers onto a specified spunbond nonwoven fabric and hydroentangling, (2) perforating, and (3) rolling up. In this case, when the rolled paper towel 1 is used as a nonwoven towel, in the manufacturing method (1) hydroentanglement, pulp fibers are hydroentangled with synthetic fibers to obtain a nonwoven fabric containing synthetic fibers and pulp fibers. The hydroentanglement method is preferably the method described in JP 2018-193634 A, for example.

[0050] Although the present invention has been described above using embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various modifications and improvements can be made to the above embodiments. Furthermore, it is clear from the claims that such modifications and improvements can also be included within the technical scope of the present invention. [Example]

[0051] The present invention will be described in detail below with reference to examples, but the present invention is not limited to the examples shown below.

[0052] Roll-shaped paper towel packages of Examples 1 to 15 and Comparative Examples 1 to 6 shown in Tables 1 and 2 were produced. The roll-shaped paper towel packages of all Examples and Comparative Examples were measured for the above-mentioned parameters and evaluated as follows. All measurement results and evaluations are shown in Tables 1 and 2.

[0053] Resistance to tearing of second film: Resistance to tearing of the second film when the roll-shaped paper towel package was lifted was evaluated as follows. The second film is easily torn and the tear is easily large: × The second film is a little easy to tear and the tear is a little big, but it's not a problem. The second film is resistant to tearing and tears are small: The second film hardly breaks and tears hardly occur:◎

[0054] Ease of carrying: The ease of carrying the rolled paper towel package was evaluated as follows. The size is too large or the aspect ratio of the roll paper towel package is too large, making it difficult to carry: × The size is a little large, and the aspect ratio of the roll paper towel packaging is a little large, making it a little difficult to carry, but it's not a problem: △ The size is a little large, and the aspect ratio of the roll paper towel packaging is a little large, but the packaging is easy to carry: Excellent The size is just right, and the aspect ratio of the roll paper towel packaging is just right, making it very easy to carry around.

[0055] Cosmetic Aesthetics: The cosmetic aesthetics of the roll paper towel packaging was evaluated as follows. Poor film tightness and cosmetic appearance: × The film is slightly less tight and less aesthetically pleasing: △ Excellent film tightness and cosmetic properties: ○ Excellent film tightness and cosmetic properties:◎

[0056] Retention of rolled product: The retention of the rolled paper towels in the rolled paper towel package was evaluated as follows. The rolled paper towels tend to move around a lot within the film, making them difficult to hold: × The rolled paper towels tend to move around inside the film, making it less stable, but this is not a problem. The rolled paper towels do not move easily within the film, providing excellent retention. The rolled paper towels barely move within the film, providing excellent retention.

[0057] Resistance to crushing of roll product: The state of the roll paper towels when taken out of the roll paper towel package after being carried was evaluated as follows. The rolled paper towels are easily crushed and often get crushed to a large extent: × The rolled paper towels are a little easy to crush, and some of them are crushed, but this does not affect their use. The rolled paper towels are a little hard to crush, and some are crushed, but this does not affect their use: ○ The rolled paper towels are hard to crush, and almost none get crushed: ◎

[0058] [Table 1]

[0059] [Table 2]

[0060] As described above, according to the manufacturing method of the present invention, a package containing four rolled paper towels, or a package containing two rolled paper towels, can be produced in which the film is less likely to tear when carried, has a moderate tightness that makes it easy to carry and aesthetically pleasing, the rolled paper towels inside the package are less likely to be crushed, and the rolled paper towels can be held stably within the package. [Explanation of symbols]

[0061] 1 roll of paper towels 1a surface 1b back side 1e The outermost edge of a paper towel roll 1x paper towel 10 4-roll packaging 11 First Film 111 First seal part 112 First gusset folding section 113 Handle 12 Second Film 121 Second seal part 122 Second gusset fold 100 roll paper towel packaging

Claims

1. a step of inserting a total of four rolls of paper towels, two rolls in the vertical direction and two rolls in the horizontal direction, all axially aligned, into a cylindrical first film whose one end is sealed from the other end, and sealing the other end to produce a four-roll package using gusset packaging; A method for manufacturing a rolled paper towel package, comprising the steps of inserting two of the four-roll packages, arranged so that the axial direction of the rolled paper towels is approximately parallel to the height direction and four are lined up in the width direction, into a cylindrical second film sealed at one end, one after the other, and sealing the other end to package the rolled paper towels in a gusset package, thereby manufacturing a rolled paper towel package, The inclination angle of the first gusset fold portion of the four-roll package is 15° or more and 50° or less, and the inclination angle of the second gusset fold portion of the roll-shaped paper towel package is 25° or more and 55° or less, The width-to-depth dimensional ratio of the bottom surface of the roll-shaped paper towel package is 1.5:1 or more and 2.6:1 or less, The rolled paper towel has a tightness of 2 mm or more and 10 mm or less, (weight of the 4-roll package × 2 / basis weight of the second film) is 30 (g / (g / m ２ )) or more 100 (g / (g / m ２ )) A method for producing a roll-shaped paper towel package, characterized in that:

2. 2. The method for manufacturing a roll-shaped paper towel package according to claim 1, wherein the width of the roll-shaped paper towel package is 400 mm or more and 480 mm or less, the depth is 190 mm or more and 260 mm or less, and the height is 260 mm or more and 300 mm or less.

3. 3. The method for manufacturing a roll-shaped paper towel package according to claim 1 or 2, wherein the four-roll package has a width dimension of 190 mm or more and 240 mm or less, a depth dimension of 190 mm or more and 240 mm or less, and a height dimension of 255 mm or more and 295 mm or less.

4. The four-roll package has a first seal portion including a handle portion formed by gusset packaging, and the roll-shaped paper towel package has a second seal portion formed by gusset packaging, 4. A method for manufacturing a roll-shaped paper towel package according to claim 1, wherein in the step of inserting two of the four-roll packages into the second film, the direction in which the first seal portion extends and the direction in which the four-roll packages are inserted are approximately perpendicular, and the axial direction of the roll-shaped paper towel and the direction in which the second seal portion extends are approximately parallel.

5. The roll weight of the rolled paper towel excluding the core is 100 g or more and 550 g or less, the wound length is 7 m or more and 24 m or less, and the roll density is 0.05 g / cm ３ 0.19g / cm or more ３ 5. The method for producing the roll-shaped paper towel package according to claim 1, wherein the following steps are performed:

6. The method for producing a roll-shaped paper towel package according to any one of claims 1 to 5, wherein the second film has a thickness of 25 µm or more and 60 µm or less.

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