Roll-shaped paper towel product

Abstract

To provide a roll-shaped paper towel product in which there is no waste as far as a water absorption amount (basis weight) is constant in 1-ply and a rolling length is in a constant range, the roll-shaped paper towel that has good decorativeness of film packaging in the caramel wrapping form and also has good usability of a rolled product.SOLUTION: A roll-shaped paper towel product comprises: a roll-shaped paper towel containing synthetic fibers and pulp fibers, and having an embossed sheet of 1-ply being wound in a roll; and a packaging film. The roll-shaped paper towel product is provided in which the basis weight of the paper towel is 40 g / m2 or more and 150 g / m2 or less, a water absorption amount per unit area is 210 g / m2 or more and is 540 g / m2 or less, the water absorption amount per unit weight is 3.0 g / g or more and is 6.5 g / g or less, a rolling length of a roll is 7 m or more and 24 m or less, a roll density is 0.05 g / cm3 or more and 0.22 g / cm3 or less, and a product is a caramel packaging body of 1 roll.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a roll of paper towel products packaged in a packaging film. [Background technology]

[0002] Paper towels, such as kitchen towels and kitchen paper, have a variety of uses, such as cleaning grease stains around the kitchen, wiping with water, and draining food. Paper towels are required to have excellent absorbency for water and oil, to not tear easily when used for cleaning purposes, and to be strong enough to withstand continuous use. In addition to ordinary paper towels, commercially available paper towels with such strength include those made of synthetic fibers that have been hydroentangled with pulp fibers. Paper towels containing synthetic fibers are highly durable and can be reused by simply rinsing them with water.

[0003] As a prior art document relating to the technique of hydroentangling pulp fibers with synthetic fibers as described above, for example, Patent Document 1 describes a nonwoven fabric wiper obtained by hydroentangling a pulp fiber web and a synthetic fiber web, in which the average fiber length of the pulp fibers contained in the pulp fiber web is 1.0 to 5.0 mm, and the basis weight of the nonwoven fabric wiper is 20 to 42 g / m 2 The nonwoven fabric wiper is characterized in that the composition ratio is 70 to 50 mass % of a pulp fiber web and 30 to 50 mass % of a synthetic fiber web. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-193634 Summary of the Invention [Problem to be solved by the invention]

[0005] With regular paper towels, it is easy to adjust the way they are rolled and the way the embossing is applied, but with roll paper towel products made by rolling and packaging paper towels containing synthetic fibers like those mentioned above, if they are rolled too tightly, the embossing will be crushed, reducing the paper thickness and potentially reducing absorbency, as well as increasing the likelihood of packaging defects such as scorching (especially the top surface of caramel packaging shown in Figure 1).On the other hand, if they are rolled too loosely, the roll length will be shortened and packaging defects due to poor sealing will be more likely to occur, resulting in a less aesthetically pleasing package.

[0006] On the other hand, if an attempt is made to solve these problems by increasing the basis weight of paper towels to achieve both absorbency and aesthetic packaging, the sheets will not be used effectively (sheets will be wasted). For these reasons, it has been difficult for conventional paper towel products, in which pulp fibers are hydroentangled with synthetic fibers, to achieve both water absorbency and decorative packaging.

[0007] The object of the present invention is to provide a rolled paper towel product in which the water absorption capacity (basis weight) per ply is within a certain range without waste, the roll length is within a certain range, the film packaging form in caramel packaging is aesthetically pleasing, and the roll product is easy to use. [Means for solving the problem]

[0008] The inventors have conducted extensive research and have found that, in a roll paper towel product including a single-ply embossed sheet-like paper towel containing synthetic fibers and pulp fibers, by specifying the basis weight of the paper towel, the water absorption per unit area and per unit weight, as well as the winding length and roll density of the roll paper towel within predetermined numerical ranges, it is possible to produce a roll paper towel product in which the water absorption (basis weight) per ply is within a certain range and there is no waste, and in which the winding length is within a certain range, the cosmetic quality of the film packaging form in caramel packaging is good, and the roll product is easy to use, thereby solving the above-mentioned problems and leading to the completion of the present invention. Specifically, the present invention provides the following:

[0009] (1) A first aspect of the present invention is a rolled paper towel product comprising a rolled paper towel in which one ply of embossed sheet-like paper towel containing synthetic fibers and pulp fibers is wound into a roll, and a packaging film for packaging the rolled paper towel, wherein the basis weight of the paper towel is 40 g / m 2 More than 150g / m 2 Below, the water absorption per unit area is 210g / m 2 More than 540g / m 2 The water absorption per unit weight is 3.0 g / g or more and 6.5 g / g or less, the roll length of the rolled paper towel is 7 m or more and 24 m or less, and the roll density is 0.05 g / cm 3 More than 0.22g / cm 3 The rolled paper towel product is characterized in that the rolled paper towel product is one roll of caramel packaging.

[0010] (2) A second aspect of the present invention is the rolled paper towel product according to (1), characterized in that the rolled paper towel has a winding diameter of 90 mmφ or more and 160 mmφ or less.

[0011] (3) A third aspect of the present invention is a roll-shaped paper towel product according to (1) or (2), characterized in that the depth of each embossment is 0.07 mm or more and 1.8 mm or less.

[0012] (4) A fourth aspect of the present invention is a roll-type paper towel product according to any one of (1) to (3), characterized in that the synthetic fiber content is 5% or more and 50% or less, and the pulp fiber content is 50% or more and 95% or less.

[0013] (5) A fifth aspect of the present invention is a roll-shaped paper towel product according to any one of (1) to (4), characterized in that the packaging film has heat-sealing properties.

[0014] (6) The sixth aspect of the present invention is a roll-shaped paper towel product according to any one of (1) to (5), characterized in that the thickness of the packaging film is 20 μm or more and 50 μm or less.

[0015] (7) A seventh aspect of the present invention is a roll-shaped paper towel product according to any one of (1) to (6), wherein the synthetic fiber has a basis weight of 4 g / m 2 More than 40g / m 2 or less, and the basis weight of the pulp fiber is 33 g / m 2 More than 120g / m 2 It is characterized by the following:

[0016] (8) An eighth aspect of the present invention is the roll-shaped paper towel product according to any one of (1) to (7), characterized in that the paper towels are kitchen towels. [Effects of the Invention]

[0017] According to the present invention, a rolled paper towel product can be provided in which the water absorption capacity (basis weight) per ply is within a certain range without waste, the roll length is within a certain range, the cosmetic appearance of the film packaging form in caramel packaging is good, and the roll product is easy to use. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a perspective view showing the entire rolled paper towel product of the present invention. [Figure 2] 1 is a perspective view showing the entire roll of paper towels with the packaging film removed from the roll of paper towel product of the present invention. FIG. [Figure 3]FIG. 1 is a diagram showing how to determine the area of ​​embossment in the roll-shaped paper towel product of the present invention. [Figure 4] FIG. 1 is a diagram showing a height profile on the XY plane as observed by a microscope using shading. [Figure 5] This is a graph showing the height profile on the XY plane obtained by a microscope. [Figure 6] FIG. 1 is a diagram showing how to determine the depth of embossing for the embossing of the rolled paper towel product of the present invention. [Figure 7] FIG. 1 is a diagram showing a method for measuring the water absorption of the roll-shaped paper towel product of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, the form for carrying out the present invention (hereinafter referred to as the embodiment) will be described in detail with reference to the drawings. However, these are presented for the purpose of illustration only and are not intended to limit the present invention.

[0020] 1. Rolled paper towel products 1 is a perspective view showing the entire roll-type paper towel product 1 of the present invention. The roll-type paper towel product 1 of the present invention includes a roll-type paper towel 10 and a packaging film 20 that packages the roll-type paper towel 10. The roll-type paper towel product 1 is one roll of roll-type paper towel 10 packaged in the packaging film 20 using caramel packaging (caramel packaging). The material of the packaging film 20 is not particularly limited, but polyethylene, polypropylene, polyester, polyamide, polycarbonate, polystyrene, and polyvinyl chloride are preferred, polyethylene and polypropylene are more preferred, polyethylene is even more preferred, and 100% polyethylene is most preferred. It is also preferable for the film to have heat-sealing properties. Furthermore, the thickness of the packaging film 20 is preferably 20 μm to 50 μm, more preferably 25 μm to 45 μm, and even more preferably 30 μm to 40 μm. If the thickness is less than 20 μm, packaging defects such as scorch are likely to occur during heat sealing, resulting in poor aesthetic appeal. If the thickness exceeds 50 μm, it becomes difficult to package the rolled paper towels 10, and the aesthetic appeal of the film packaging form in caramel packaging is poor. The film thickness is measured in accordance with JIS K 7130.

[0021] 2. Rolled paper towels 2 is a perspective view showing the entire rolled paper towel 10 of the present invention with packaging film 20 removed from the rolled paper towel product 1. The rolled paper towel 10 of the present invention is a rolled paper towel 10 in which one ply of embossed sheet-like paper towel 10x containing synthetic fibers and pulp fibers is wound into a roll. Preferably, the paper towel 10x is perforated in the CD (cross-machine) direction at equal intervals from the outermost edge 10e of the paper towel 10x in the MD (machine direction) (not shown). In this case, the MD (Machine Direction) direction is the direction in which the paper towel 10x is wound (the direction in which the paper towel 10x 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 10x of the present invention can be used as a variety of 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 product used as a wiper or kitchen towel, it may also be used as a nonwoven fabric product.

[0022] 2, the surface of the paper towel 10x facing the outside of the roll is referred to as surface 10a (surface of the paper towel 10x), and the surface facing the center of the roll is referred to as back surface 10b (back surface of the paper towel 10x). Note that, due to hydroentanglement, as described below, the amount of synthetic fibers contained in the paper towel 10x is preferably greater on the surface side of the paper towel 10x (i.e., on the surface 10a side) and less on the back surface 10b side.

[0023] (seat length and seat area) In the roll-shaped paper towel 10, when the paper towel 10x between the perforations is considered as a single sheet, the sheet length (length in the MD direction) is preferably 160 mm to 330 mm, more preferably 180 mm to 305 mm, and even more preferably 200 mm to 280 mm. If the sheet length is less than 160 mm, the sheet area described below becomes small, making the sheet (paper towel 10x) less user-friendly. If the sheet length exceeds 330 mm, the sheet area becomes too large, making it impossible to effectively use the sheet (paper towel 10x) (waste of sheet occurs). The sheet width (length in the CD direction) is preferably 180 mm to 350 mm. The sheet area of ​​10x paper towels is 0.03m 2 More than 0.12m 2 Preferably, it is less than 0.04m 2 More than 0.10m 2 It is more preferable that it is 0.05m or less. 2 Over 0.08m 2 It is more preferable that the sheet area is 0.03 m or less. 2If the sheet area is less than 0.12 m, the sheet area will be small and the sheet (10x paper towel) will be less usable. 2 If it exceeds this, the sheet area becomes too large and the sheet (10x paper towels) cannot be used effectively (the sheet will be wasted).

[0024] (winding length and winding diameter) The roll length of the rolled paper towel 10 is 7 m or more and 24 m or less, preferably 10 m or more and 20 m or less, and more preferably 13 m or more and 18 m or less. If the roll length is less than 7 m, the roll diameter DR becomes small, making the roll product less user-friendly. If the roll length exceeds 24 m, the roll diameter DR becomes large, making the roll product less user-friendly. The roll diameter DR of the roll-shaped paper towel 10 is preferably 90 mmφ or more and 160 mmφ or less, more preferably 100 mmφ or more and 140 mmφ or less, and even more preferably 108 mmφ or more and 130 mmφ or less. If the roll diameter DR is less than 90 mmφ, the roll diameter DR will be too small and the roll product will be less user-friendly. If the roll diameter DR is more than 160 mmφ, the roll diameter DR will be too large and the roll product will be less user-friendly.

[0025] The roll length is determined by measuring the length of 10 sheets of paper towels 10x (sheets) between the perforations of the roll of paper towels 10. Then, the number of sheets of paper towels 10x on the roll of paper towels 10 is measured, and the roll length is calculated proportionally from the length of 10 sheets and the number of sheets of paper towels 10x. For example, if the length of 10 sheets is 1.80 m and there are 150 sheets of paper towels 10x, the roll length is 1.80 m x (150 / 10) = 27 m. The roll diameter DR is measured using a diameter ruler manufactured by Muratec KDS Corporation. Ten rolls of paper towels 10 are measured, and the measurement results are averaged.

[0026] (roll width and roll weight) The roll width of the rolled paper towel 10 is preferably 180 mm to 350 mm, more preferably 210 mm to 325 mm, and even more preferably 240 mm to 300 mm. If the roll width is less than 180 mm, the sheet area described above becomes small, making the sheet (paper towel 10x) less user-friendly. If the roll width exceeds 350 mm, the sheet area described above becomes too large, making it impossible to use the sheet (paper towel 10x) effectively (leaving the sheet wasted). The roll weight of the rolled paper towel 10 is preferably 140 g to 600 g, more preferably 220 g to 450 g, and even more preferably 250 g to 400 g. If the roll weight is less than 140 g, the roll density described below will not be sufficient, making film packaging difficult and resulting in poor aesthetics for the film packaging form in caramel packaging. If the roll weight exceeds 600 g, the roll density will be too high, resulting in a small thickness of the paper towel 10x, poor absorbency, and a high likelihood of defects such as scorching during film packaging. The roll weight is the mass of one roll per 275mm of roll width, excluding the core (paper tube). If the roll width is not 275mm, it is converted to the mass per 275mm by proportional calculation.

[0027] (core diameter) Furthermore, the core diameter DI, which is the outer diameter of the core (paper tube) that forms the core of the rolled paper towel 10 of the present invention, is preferably 30 mmφ or more and 60 mmφ or less, more preferably 34 mmφ or more and 55 mmφ or less, and even more preferably 37 mmφ or more and 50 mmφ or less. If the core diameter DI is less than 30 mmφ, the winding diameter DR will be small, making the roll product less user-friendly. If the core diameter DI exceeds 60 mmφ, the winding diameter DR will be large, making the roll product less user-friendly. The core diameter DI is measured using a diameter rule manufactured by Muratec KDS Co., Ltd. The measurement is carried out by measuring 10 rolled paper towels 10 and averaging the measurement results.

[0028] (roll density) The roll density of the rolled paper towel 10 is 0.05 g / cm 3 More than 0.22g / cm 3 less than 0.07 g / cm 3 More than 0.19g / cm 3 Preferably, it is 0.09 g / cm or less. 3 More than 0.15g / cm 3 It is more preferable that the roll density of the rolled paper towel 10 is 0.05 g / cm or less. 3 If the roll density of the rolled paper towel 10 is less than 0.22 g / cm, the roll will be too loose, making film wrapping difficult and resulting in poor aesthetics of the film wrapping form in caramel wrapping. 3 If the thickness exceeds this, the paper towel will be wound too tightly, reducing its thickness (10x), resulting in poor absorbency. Also, defects such as scorching will be more likely to occur when the film is wrapped.

[0029] Roll density is expressed as (roll weight) ÷ (roll volume). Roll volume is expressed as [{cross-sectional area of ​​the roll outer diameter (winding diameter DR)} - (cross-sectional area of ​​the core diameter DI)] × roll width (converted per 275 mm). For example, if the roll weight (excluding the core) per 275 mm of roll width is 337 g, the winding diameter DR is 119 mmφ, and the core diameter DI is 49 mmφ, the roll density = 0.13 g / cm 3 If the rolled paper towel 10 does not have a core, the diameter of the central hole is taken as the core diameter DI.

[0030] 3. Paper towels The paper towel 10x of the present invention contains synthetic fibers and pulp fibers. Examples of synthetic fibers include nylon, vinylon, polyester, acrylic, polyethylene, polypropylene, and polystyrene. To obtain a paper towel 10x with a certain range of water absorption capacity (basis weight) per ply, such as the present invention, polyethylene and polypropylene are preferred, with polypropylene being more preferred. While there are no restrictions on the nonwoven fabric used as the synthetic fiber, spunbond nonwoven fabric is preferred. By using a polypropylene spunbond nonwoven fabric, a paper towel 10x with a certain range of water absorption capacity (basis weight) per ply, such as the present invention, can be obtained. Furthermore, the functionality of the rolled paper towel 10 is improved. Furthermore, common pulp fibers, such as softwood bleached kraft pulp (NBKP) and hardwood bleached kraft pulp (LBKP), can be used as the pulp fiber. The content ratio of NBKP to LBKP in the pulp fiber 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 are those made from, for example, radiata pine, slash pine, southern pine, lodgepole pine, spruce, and Douglas fir. NUKP can be used instead of NBKP, and LUKP can be used instead of LBKP. In this case, the proportion (content) of synthetic fibers in the paper towel 10x is preferably 5% to 50%, more preferably 9% to 41%, and even more preferably 12% to 28%. If the proportion of synthetic fibers is less than 5%, the absorbency is good, but the sheet (paper towel 10x) cannot be used effectively (waste of sheet occurs). In addition, the strength of the paper towel 10x may be weakened, making it difficult to use. If the proportion of synthetic fibers exceeds 50%, the absorbency of the paper towel 10x will be poor. Furthermore, the pulp fiber ratio (content ratio) in the paper towel 10x is preferably 50% to 95%, more preferably 59% to 91%, and even more preferably 72% to 88%. If the pulp fiber ratio is less than 50%, the absorbency of the paper towel 10x will be poor. If the pulp fiber ratio is more than 95%, the absorbency will be good, but the sheet (paper towel 10x) will not be usable effectively (waste of sheet will occur). Furthermore, the strength of the paper towel 10x will be weakened, which may make it difficult to use.

[0031] Furthermore, the paper towel 10x preferably contains a common wet strength agent. The content of the wet strength agent (in terms of solids (active ingredients)) relative to the pulp fiber (bone dry) is preferably 0.05% to 1.0%, more preferably 0.10% to 0.50%, and even more preferably 0.20% to 0.40%. By keeping the wet strength agent content within the above numerical range, it is possible to obtain a roll-shaped paper towel 10 as in the present application, in which the water absorption capacity (basis weight) per ply is within a constant range, there is no waste, and the roll length is within a constant range. If necessary, the paper towel 10x 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).

[0032] (Basic weight) The basis weight of paper towel 10x is 40 g / m 2 More than 150g / m 2 or less, 48 ​​g / m 2 More than 110g / m 2 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 10x is 40 g / m or less. 2 If the basis weight of the paper towel 10x is less than 150 g / m, the water absorbency of the paper towel 10x will be poor. 2 If the temperature exceeds this, the absorbency is good, but the sheet (10x paper towel) cannot be used effectively (sheet will be wasted).

[0033] The basis weight of the synthetic fiber contained in the 10x paper towel is 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 It is more preferable that the basis weight of the synthetic fiber is 4 g / m or less. 2 If the weight is less than 40g / m, the absorbency is good, but the sheet (Paper Towel 10x) cannot be used effectively (the sheet will be wasted). Also, the strength of the Paper Towel 10x will be weakened, making it difficult to use. 2 Anything above that level will be 10 times less absorbent than a paper towel. Furthermore, the basis weight of the pulp fiber contained in the 10x paper towel is 33 g / m 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 pulp fiber is 33 g / m or less. 2 If the pulp fiber basis weight is less than 120 g / m, the absorbency of the paper towel will be inferior to that of a 10x paper towel. 2 If the temperature exceeds this limit, the absorbency will be good, but the sheet (10x paper towel) will not be usable effectively (the sheet will be wasted). Also, the strength of the 10x paper towel will be weakened, making it difficult to use. The basis weight of the paper towel 10x is measured in accordance with JIS P 8124. However, since it is difficult to measure the basis weight of the synthetic fiber and the pulp fiber individually after the hydroentanglement described below, they are measured, for example, by the following method.

[0034] 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 10 paper towels 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 10 paper towels (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 10x paper towels x (mass of synthetic fiber / mass of 10x paper towels) Pulp fiber basis weight = Basis weight of 10x paper towels × [(mass of 10x paper towels - mass of synthetic fiber) / mass of 10x paper towels]

[0035] Furthermore, if it is difficult to measure using the above method, the basis weight of the pulp fiber is calculated by subtracting the basis weight of the synthetic fiber used from the basis weight of the paper towel 10x measured according to JIS P 8124. However, since the basis weights of the raw roll (base paper) after hydroentanglement and the embossed paper towel 10x are different (the basis weight is lower after embossing), the final basis weights of the synthetic fiber and pulp fiber are determined by making the following corrections. For example, the basis weight of synthetic fibers is 26 g / m 2 The basis weight of the base paper after hydroentanglement is 128 g / m 2 , the basis weight of 10x embossed paper towels is 125g / m 2 In this case, the basis weight of the synthetic fiber is 26×125 / 128=25g / m 2 , the basis weight of pulp fiber is 125-25=100g / m 2 Let's say.

[0036] (thickness and specific volume) The thickness (paper thickness) of the paper towel 10x is preferably 200 μm to 1500 μm, more preferably 300 μm to 1200 μm, and even more preferably 400 μm to 900 μm. A thickness less than 200 μm results in poor absorbency. A thickness greater than 1500 μm results in good absorbency, but the sheet (paper towel 10x) cannot be used effectively (waste of sheet occurs). Thickness is measured using a thickness gauge (PEACOCK® dial thickness gauge manufactured by Ozaki Seisakusho Co., Ltd.). The measurement conditions are a 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 rate of 1 mm per second or less. Measurements are repeated 10 times and the results are averaged. Measurements are performed by stacking three paper towels 10x, and the measured value is divided by three to obtain the thickness value. The specific volume of 10x paper towels is 3cm 3 / g or more 18cm 3 / g or less, and 3 / g or more 15.5cm 3 / g or less is more preferable, and 3 / g or more 13cm 3 / g or less is more preferable. 3 If the specific volume is less than 18 cm3, the absorbency is inferior to that of a paper towel 10 times. 3 If the density exceeds 100 / g, the absorbency is good, but the sheet (10x paper towel) cannot be used effectively (waste of the sheet occurs). The specific volume is calculated by dividing the thickness of 10x paper towel by the basis weight, and is the volume cm per unit g. 3 It is expressed as:

[0037] (Embossed) The rolled paper towel 10 (paper towel 10x) of the present invention is embossed, and the embossing is preferably performed using a roll winder. The shape of the embossed portion itself can be any shape, including circle, oval, rectangle, square, floral pattern, polygon, letter, line, logo, etc., but a hexagonal shape is preferred to obtain a rolled paper towel 10 of the present invention, which has a constant water absorption capacity (basis weight) per ply, no waste, and a constant roll length.

[0038] In this case, the area of ​​a single embossment in the embossing pattern is 2 mm 2 More than 50mm 2 Preferably less than 6 mm 2 Over 40mm 2 It is more preferable that it is less than 10 mm. 2 More than 30mm 2 It is more preferable that the area of ​​the embossment itself is measured by visually measuring the length a of one side of the hexagonal embossment shown in Fig. 3, and then multiplying this by six to calculate the area of ​​an equilateral triangle having this length as one side. If visual measurement is difficult, the size of the embossment may be measured using a microscope, which will be described later, and the area may be calculated. In addition, the number of pieces per unit area for embossed paper towels 10x is 50 pieces / 100cm 2 More than 1000 pieces / 100cm 2 Preferably, it is less than 100 pieces / 100cm 2 More than 800 pieces / 100cm 2 It is more preferable that the number of pieces is less than 200 pieces / 100cm. 2 More than 500 pieces / 100cm 2 The number of particles per unit area is measured by measuring the number of particles per unit area by measuring the number of particles per unit area in an arbitrary 100 cm 2 area between two adjacent perforations in the longitudinal direction (MD) across the entire width of the sheet (paper towel 10x). 2 The measurement was visually carried out by selecting a part of the roll. 2 If you cannot select this area, measure the number of embossments on the measurable area and measure the area to be measured. 2The number of embossments per unit is calculated. By keeping both the area of ​​each embossment and the number per unit area within the above numerical ranges, it is possible to obtain a rolled paper towel 10 as in the present application, which has a constant range of water absorption (basis weight) per ply with no waste, a constant range of roll length, and has good cosmetic properties in the film packaging form in caramel packaging and is easy to use as a roll product.

[0039] Furthermore, the depth of the embossment itself is preferably 0.07 mm to 1.8 mm, more preferably 0.2 mm to 1.2 mm, and even more preferably 0.3 mm to 0.8 mm. If the depth exceeds 1.8 mm, the film will be loosely wrapped to ensure the required depth, making packaging difficult and resulting in a poor aesthetic appearance for the film packaging of caramel candy.

[0040] The depth of each individual embossment is measured using a microscope. The microscope used can be a Keyence One-Shot 3D Measuring Macroscope VR-3100. The microscope image observation, measurement, and image analysis software can be the VR-H1A. Measurement conditions are a magnification of 12x and a field of view of 24mm x 18mm. The measurement magnification and field of view can be changed as appropriate depending on the desired size of the embossment.

[0041] FIG. 4 shows a height profile on the XY plane taken with a microscope, with the height of the surface of the paper towel 10x represented by shading. The hexagonal areas in FIG. 4 that are shading different from the surrounding area represent individual embossments. The depth of each embossment is determined by measuring the height difference of the embossment using the microscope. The measurement is performed on the surface 10a side of the paper towel 10x. During the measurement, three wraps of paper towel 10x are removed from the roll of paper towel 10, and the state of the paper towel 10x is measured using the fourth wrap of paper towel 10x. The measurement is performed while avoiding the perforations. First, a line segment AB is drawn as shown in Figure 4 to obtain the height profile shown in Figure 5. Line segment AB should be drawn across the embossments. Line segment AB is drawn in the width direction (CD) of the paper towel 10x. However, if the spacing between embossments is, for example, 2 mm or more, the line segment may be drawn diagonally or in the machine direction. The height profile is a (measured) cross-sectional curve S that represents the unevenness of the actual sample surface of the paper towel 10x. However, it also contains noise (steep peaks due to fiber clumps, whisker-like fibers, or fiber-free areas on the surface of the paper towel 10x). Therefore, when calculating the height difference of the unevenness, it is necessary to remove such noise peaks. Therefore, the (measured) cross-sectional curve S in Figure 5 was smoothed using the weighted average radio button filter size of ±12 to obtain the cross-sectional curve W in Figure 6. Note that smoothing using the weighted average radio button filter can be achieved automatically using the analysis software described above. Then, in the graph shown in Figure 6, the average of the maximum values ​​on the vertical axis of the convex portion H1 and the convex portion H2 adjacent to the convex portion H1 was calculated, and the minimum value on the vertical axis of the concave portion D1 sandwiched between the convex portions H1 and H2 was determined. The value obtained by subtracting the minimum value from the average of the maximum values ​​thus obtained was used as the provisional depth of the single embossment. Then, as shown in Figure 6, similar measurements were performed at two consecutive locations on the cross-sectional curve (the concave portion D1 and the concave portion D2 sandwiched between the convex portions H2 and H3) (two consecutive measurement results were obtained at this point). Then, the rolled paper towel 10 is rotated three times by 90 degrees in the flow direction of the paper towel 10x, and the same measurement as above is taken at each position (a total of four measurement positions in the flow direction), and the average value of the total eight positions (2 x 4) is ultimately adopted as the depth of the individual embossment.

[0042] (Water absorption) In the present invention, the water absorption per unit area of ​​the paper towel 10x is 210 g / m 2 More than 540g / m 2 less than 250 g / m 2 More than 500g / m 2Preferably, it is 300 g / m or less. 2 More than 430g / m 2 It is more preferable that the water absorption per unit area is 210 g / m or less. 2 If it is less than 540g / m, the absorbency will be inferior to that of 10x paper towels. 2 If the temperature exceeds this, the absorbency is good, but the sheet (10x paper towel) cannot be used effectively (sheet will be wasted). Furthermore, the water absorption per unit weight of the paper towel 10x is 3.0 g / g or more and 6.5 g / g or less, preferably 3.5 g / g or more and 6.3 g / g or less, and more preferably 4.0 g / g or more and 6.0 g / g or less. If the water absorption per unit weight is less than 3.0 g / g, the water absorption of the paper towel 10x is poor. If the water absorption per unit weight is more than 6.5 g / g, the water absorption is good, but the sheet (paper towel 10x) cannot be used effectively (waste of the sheet occurs). The water absorption of each 10x paper towel is measured as follows.

[0043] First, 10x paper towels are taken and cut using a square template with each piece measuring 7.6 cm (3 inches) to prepare rectangular test pieces 200 with sides of 7.6 cm. Thereafter, the mass of the test piece 200 before water absorption is measured using an electronic balance. Then, 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). Next, distilled water is poured into a commercially available tray to a depth of 2 cm, and the test specimen 200 set in the holder 220 is immersed in the distilled water for 2 minutes. After immersion for 2 minutes, the test specimen 200 and holder 220 are removed from the distilled water, and a band 210 is attached to one corner 200d of the test specimen 200 as shown in Figure 7. The band 210 is made by cutting a 10x paper towel, the same size as the sample to be measured, into a size of 2 mm wide x 15 mm long and attaching it to a section of the test specimen 200 6 mm from corner 200d toward the center. Next, the holder 220 and test specimen 200 are hung from a rod installed in an empty water tank with the corner 200a opposite corner 200d facing up, the lid of the water tank is closed, and the test specimen 200 is left for 10 minutes. Thereafter, the holder 220 and test specimen 200 are removed from the water tank, the band 210 and holder 220 are removed, and the mass of the test specimen 200 is measured using an electronic balance. From the change in mass of the test piece 200 before and after immersion in distilled water, the amount of distilled water absorbed per unit area of ​​the test piece 200 (g (water) / m 2 (paper towel)). In addition, the water absorption per unit area (g(water) / m 2 (paper towel)) by the basis weight of the test piece 200 to obtain the water absorption per unit area (g(water) / m 2 (Paper towel)) / basis weight(g(Paper towel) / m 2 Calculate the amount of water absorbed per unit weight (g (water) / g (paper towel)) = g (water) / g (paper towel)). Measurements are taken five times for each sample, and the average value is used. This measurement is performed according to JIS P 8111 at a temperature of 23±1°C and humidity of 50±2%. The distilled water is kept at 23±1°C.

[0044] (DMDT and DCDT) In the present invention, the dry machine direction tensile strength (DMDT) of the paper towel 10x in the dry state according to JIS P 8113 is preferably 8 N / 25 mm or more and 80 N / 25 mm or less, more preferably 12 N / 25 mm or more and 65 N / 25 mm or less, and even more preferably 20 N / 25 mm or more and 50 N / 25 mm or less. In addition, in the present invention, the dry cross direction tensile strength (DCDT) of the paper towel 10x in the dry state based on JIS P 8113 is preferably 3 N / 25 mm or more and 50 N / 25 mm or less, more preferably 4 N / 25 mm or more and 35 N / 25 mm or less, and even more preferably 5 N / 25 mm or more and 25 N / 25 mm or less. Furthermore, the ratio of DMDT in paper towel 10x to DCDT in paper towel 10x (DMDT / DCDT) is preferably 1.0 or more and 5.0 or less, more preferably 1.5 or more and 4.5 or less, and even more preferably 2.0 or more and 4.0 or less. By having DMDT, DCDT, and their ratios within the above numerical ranges, it is possible to obtain a rolled paper towel 10 as in the present application that is tear-resistant, the sheet (paper towel 10x) does not become hard, the water absorption capacity (basis weight) per ply is within a constant range with no waste, the roll length is within a constant range, the cosmetic appearance of the film packaging form in caramel packaging, and ease of use as a roll product are good.

[0045] 4. Rolled paper towels and method for manufacturing rolled paper towel products As for the manufacturing method of the rolled paper towel 10 and the rolled paper towel product 1, if the paper towel 10x is a kitchen towel containing synthetic fibers and pulp fibers, it can be manufactured, for example, in the following order of steps: (1) laminating pulp fibers onto a specified spunbond nonwoven fabric and hydroentangling, (2) heat embossing with a matched steel, (3) perforation, (4) roll winding, and (5) film packaging (caramel packaging). In the manufacturing method (1), pulp fibers are hydroentangled with synthetic fibers to obtain a nonwoven fabric containing synthetic fibers and pulp fibers. The hydroentanglement method is preferably performed using, for example, the method described in JP 2018-193634 A. In the manufacturing method (2), embossing is preferably performed using a roll winder to perform a heat embossing process using a matched steel (steel match), and the embossing pattern is preferably hexagonal. In the manufacturing method (5), film packaging, the equipment and process used are not particularly limited as long as they are known packaging equipment and processes capable of caramel packaging. However, a caramel packaging machine (model: CASMATIC CMW525, manufactured by FABIO PERINI) is preferably used. A single roll product is caramel-wrapped using a polyethylene packaging film that conforms to the surface shape of the roll product, producing a single-roll package. In the resulting single-roll package, the axial direction of the roll product preferably coincides with the MD direction of the film constituting the packaging bag.

[0046] 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 and examples. 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]

[0047] 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.

[0048] The roll-shaped paper towel products of Examples 1 to 25 and Comparative Examples 1 to 10 listed in Table 5 were produced through the following steps: (1) laminating pulp fibers onto a polypropylene spunbond nonwoven fabric and hydroentangling, (2) heat embossing using a matched steel, (3) perforation, (4) roll winding, and (5) caramel wrapping using a polyethylene film. The roll-shaped paper towel products of all Examples and Comparative Examples were measured for the above-mentioned parameters and subjected to the following evaluations. All measurement results and evaluations are shown in Table 5.

[0049] Water absorbency: The water absorbency of the paper towels was evaluated according to the criteria in Table 1 below. [Table 1]

[0050] Sheets can be used without waste: Whether or not paper towels (sheets) can be used without waste was evaluated according to the criteria in Table 2 below. [Table 2]

[0051] Cosmetic Aesthetics of Packaging: The cosmetic aesthetics of the caramel packaging of rolled paper towel products were evaluated according to the criteria in Table 3 below. [Table 3]

[0052] Usability of roll products: The ease of use of roll paper towel products was evaluated according to the criteria in Table 4 below. [Table 4]

[0053] [Table 5]

[0054] As shown in Table 5, the rolled paper towels of Examples 1 to 25 all had excellent water absorbency, were usable without waste, had excellent decorative packaging, and were easy to use as rolled products. On the other hand, the rolled paper towels of Comparative Examples 1 to 10 had poor water absorbency, were wasteful, had poor decorative packaging, or were difficult to use as rolled products. As described above, the rolled paper towel product of the present invention can provide a rolled paper towel product in which the water absorption capacity (basis weight) per ply is within a certain range without waste, and the roll length is within a certain range, and the film packaging is aesthetically pleasing and the roll product is easy to use. [Explanation of symbols]

[0055] 1. Rolled paper towel products 10 rolls of paper towels 10a surface 10b back side 10e The outermost edge of a roll of paper towels 10x paper towels 20 Packaging film 200 specimens 200a, 200d corner 210 Obi 220 Holder

Claims

1. A rolled paper towel product comprising a sheet-like paper towel containing synthetic fibers and pulp fibers and having one ply of embossed paper towel wound into a roll, and a packaging film for packaging the rolled paper towel; The paper towel has a basis weight of 40 g / m ２ 150g / m or more ２ Hereinafter, the water absorption per unit area is 210 g / m ２ 540g / m or more ２ The water absorption per unit weight is 3.0 g / g or more and 6.5 g / g or less, The rolled paper towel has a winding length of 7 m or more and 24 m or less, and a roll density of 0.05 g / cm ３ 0.22g / cm or more ３ is as follows: A rolled paper towel product, characterized in that the rolled paper towel product is a roll of caramel wrap.

2. 2. The rolled paper towel product according to claim 1, wherein the rolled paper towel has a winding diameter of 90 mm or more and 160 mm or less.

3. 3. The roll-shaped paper towel product according to claim 1 or 2, wherein the embossing has a depth of 0.07 mm or more and 1.8 mm or less.

4. 4. The roll-shaped paper towel product according to claim 1, wherein the synthetic fiber content is 5% or more and 50% or less, and the pulp fiber content is 50% or more and 95% or less.

5. 5. The rolled paper towel product according to claim 1, wherein the packaging film has heat-sealability.

6. 6. The roll-shaped paper towel product according to claim 1, wherein the thickness of the packaging film is 20 μm or more and 50 μm or less.

7. The synthetic fiber has a basis weight of 4 g / m ２ 40g / m or more ２ and the pulp fiber has a basis weight of 33 g / m or less. ２ 120g / m or more ２ 7. A rolled paper towel product according to any one of claims 1 to 6, characterized in that:

8. 8. The rolled paper towel product of claim 1, wherein the paper towel is a kitchen towel.

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