Kitchen Towel Roll Products

Abstract

To provide a kitchen towel roll product remaining water absorption properties and holder suitability at a high level even when being compressed to increase transportation efficiency.SOLUTION: A kitchen towel roll product 1 which comprises a kitchen towel roll 2 obtained by winding in a roll state a sheet-like kitchen towel 11x as a two-ply laminate, and a packaging film 20 for packaging the kitchen towel roll 2 is such that: the kitchen towel 11x has an uneven pattern derived from a paper machine, and applied from a headbox to a Yankee dryer inlet of the paper machine; a basis weight of two-ply is 32 g / m2 or more and 65 g / m2 or less; an amount of water absorption is 155 g / m2 or more and 520 g / m2 or less; and the winding softness of the kitchen towel roll 2 is 2 mm or more and 12 mm or less.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] The shortage of truck drivers has led to rising logistics costs, and CO 2 In light of the increase in waste, it is becoming increasingly important to improve the efficiency of logistics. Generally, when roll-type products such as kitchen towel rolls and toilet roll products are transported in cardboard cases that are close to a cube, there is space at the four corners, resulting in waste. In recent years, pallet transport has become the mainstream, rather than bulk loading onto trucks, and even a difference of just a few centimeters in the size of the cardboard case can have a significant impact on loading efficiency.

[0003] Therefore, in order to improve the transport efficiency, toilet roll products have been proposed that are longer in length to make them more compact than before, or that are transported with the core crushed. However, the compact products have a problem that the paper width is narrower and they are difficult to use. In addition, if the core is crushed, it becomes difficult to attach them to a holder. In the case of kitchen towel rolls, there are also products that are long, but it is difficult to balance this with water absorption. In addition, if the kitchen towel roll is softened and then compressed while being inserted into a cardboard case, no space is wasted, but there are problems such as the embossing being crushed, reducing water absorption, or the product being deformed into a square shape, making it difficult to use when placed in a holder.

[0004] Patent Document 1 discloses a kitchen towel roll in which properties such as the density of embossed convex parts, the winding density of the roll, and the ratio of the minimum embossed area to the maximum embossed area are adjusted within a predetermined range. However, the purpose of Patent Document 1 is to maintain the absorbency of the kitchen towel roll even if the winding length of the kitchen towel roll is long. In addition, the kitchen towel roll of Patent Document 1 is not soft and does not easily collapse in the thickness direction (paragraph 0011). It is not clear from the prior art such as Patent Document 1 that by adjusting the predetermined properties of the kitchen towel roll within a predetermined range, it is possible to improve transport efficiency while suppressing the decrease in absorbency due to compression of the kitchen towel roll. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2019-208854 A (Claim 1, paragraph 0011) Summary of the Invention [Problem to be solved by the invention]

[0006] In the course of research into improving the transportation efficiency of kitchen towel rolls, the inventors of the present invention have studied the softness and winding diameter of kitchen towel rolls, and have obtained the following findings. If a nearly cylindrical kitchen towel roll is stored in a rectangular or cuboidal cardboard box, the gaps between the kitchen towel rolls will become large, and the transportation efficiency will decrease. In contrast, if the kitchen towel roll is soft and easily deformed, the number of kitchen towel rolls that can be stored in the cardboard box will increase, or a smaller cardboard box can be used to store the same number. However, if the kitchen towel roll is deformed too much, it will remain deformed even after being taken out of the cardboard box, and when used in a holder, it will be very difficult to use and the water absorption of the kitchen towel roll may decrease. On the other hand, if the winding diameter of the kitchen towel roll is small or the winding length is short, the ratio of the outer diameter of the core to the outer diameter of the kitchen towel roll will be large, and the transportation efficiency will be poor. Based on such findings, the inventors of the present invention have conducted further research.

[0007] An object of the present invention is to provide a kitchen towel roll product that does not lose its water absorbency even when compressed to improve transportation efficiency and has holder suitability. [Means for solving the problem]

[0008] As a result of further research, the inventors have succeeded in obtaining a kitchen towel roll product that meets the objectives, and have completed the present invention. That is, the present invention provides, as preferred embodiments, the following kitchen towel roll products (1) to (5).

[0009] (1) A kitchen towel roll product comprising a kitchen towel roll obtained by winding up a sheet-like kitchen towel that is a two-ply laminate into a roll, and a packaging film for packaging the kitchen towel roll, wherein the kitchen towel has a papermaking machine-derived uneven pattern provided between the head box of the papermaking machine and the inlet of the Yankee dryer, and the basis weight of the two plies is 32 g / m 2 More than 65g / m 2 Water absorption is 155g / m or less.2 More than 520g / m 2 The kitchen towel roll product has a winding softness of 2 mm or more and 12 mm or less. (2) The kitchen towel roll product according to (1) above, wherein the diameter of one roll of the kitchen towel is 113 mm or more and 200 mm or less. (3) The kitchen towel has an embossed pattern different from the uneven pattern derived from the papermaking machine, and the embossed pattern includes a plurality of embossed units, and the area of ​​the embossed units is 1 mm 2 More than 40mm 2 The kitchen towel roll product according to any one of (1) to (3) above, having a depth of 0.10 mm or more and 0.80 mm or less. (4) The embossed pattern has a unit area of ​​100 cm 2 (4) Kitchen towel roll products with a unit quantity of 20 or more and 1,800 or less. (5) The kitchen towel roll further has a plurality of perforations arranged at predetermined intervals in the longitudinal direction and extending in the width direction for cutting the kitchen towel in the width direction, and the area of ​​the kitchen towel enclosed by two adjacent perforations in the longitudinal direction is 0.02 m 2 More than 0.10m 2 A kitchen towel roll product as set forth above in any one of (1) to (4). Effect of the Invention

[0010] According to the present invention, a kitchen towel roll product is provided that has water absorbency that does not decrease even when compressed to increase transportation efficiency and has holder suitability. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view showing a schematic external configuration of a kitchen towel roll product according to a first embodiment of the present invention. [Diagram 2]FIG. 2 is a perspective view showing a schematic appearance of a roll provided in the kitchen towel roll product of the first embodiment shown in FIG. 1. [Diagram 3] FIG. 2 is a diagram showing how to determine the embossed area of ​​the kitchen towel provided in the kitchen towel roll product of the first embodiment shown in FIG. 1. [Figure 4] 1 is a drawing showing a height profile on an XY plane taken by a microscope using shading. [Diagram 5] 1 is a graph showing a height profile on an XY plane taken by a microscope. [Figure 6] FIG. 13 is a diagram showing how to determine the depth of an embossment having an area of ​​1 mm2 or more and 40 mm2 or less. [Figure 7] FIG. 2 is a diagram showing a method for measuring the water absorption of the kitchen towel provided in the kitchen towel roll product of the first embodiment shown in FIG. [Figure 8] 2 is a diagram showing a part of a papermaking process for the kitchen towel roll product of the first embodiment shown in FIG. 1. FIG. [Figure 9] FIG. 1 is a side view showing a schematic configuration of a device for measuring winding softness of a kitchen towel roll. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The kitchen towel roll product 1 of this embodiment will be described in detail below with reference to the drawings. Fig. 1 shows the appearance of the kitchen towel roll product 1 according to the first embodiment. Fig. 2 shows the appearance of a kitchen towel roll 2. Fig. 3 shows how to determine the embossed area of ​​a kitchen towel. Fig. 4 shows a height profile on the XY plane taken with a microscope. Fig. 5 is a graph showing the height profile on the XY plane taken with a microscope. Fig. 6 shows the shape of a square shape having an area of ​​1 mm 2 More than 40mm 2 The method for determining the depth of the following embossing units is shown below. Fig. 7 shows a method for measuring the water absorption of kitchen towel 11x. Fig. 8 shows a part of the papermaking process for kitchen towel 11x. Fig. 9 is a schematic side view of an apparatus for measuring the winding softness of kitchen towel roll 11x.

[0013] <Kitchen towel roll products> As shown in Figures 1 and 2, the kitchen towel roll product 1 of this embodiment is a two-ply laminate, and has an uneven pattern derived from a papermaking machine. A sheet-like kitchen towel 11x (hereinafter also referred to as "kitchen towel sheet 11x") having a basis weight and water absorption within a predetermined range is wound around a core 10 such as a paper tube or a plastic tube to form a kitchen towel roll 2 (hereinafter also referred to as "roll 2"), and two of these are aligned in the longitudinal direction and placed side by side to form a caramel package using packaging film 20.

[0014] Here, the uneven pattern derived from the papermaking machine is an uneven pattern that is automatically provided between the head box of the papermaking machine and the inlet of the Yankee dryer. The inventors have found through their research that when the uneven pattern derived from the papermaking machine is combined with the predetermined basis weight, water absorption amount, and winding softness of the roll 2 specified in this embodiment, the roll 2 is unlikely to be crushed even when subjected to external pressure. An example of the pressure from the outside is the compressive force when the roll 2 is stored in a cardboard box.

[0015] The kitchen towel roll product 1 of this embodiment is a product in which two kitchen towel rolls 2 are packaged, but the number of packages is not particularly limited and may be any number, for example, in the range of 1 to 4, in the range of 1 to 2, or 1. In the case of multiple packages, it is preferably 2 or 3 from the viewpoint of the aesthetic appearance of the package. By packaging the kitchen towel roll 2 in caramel, sealing failure and scorch (holes caused by burning) are unlikely to occur, and the aesthetic appearance of the package is significantly improved. In addition, since it is caramel packaged, it is also excellent in strength and ease of opening. The kitchen towel roll 2 of this embodiment is packaged in caramel, but is not limited thereto, and any of gusset packaging, pillow packaging, shrink packaging, two-sided seal packaging, etc. may be used.

[0016] Although there are no particular limitations on the outer diameter D1 of the core 10 of the roll 2, from the viewpoints of easy adjustment of the winding density of the roll 2 and the handleability of the roll 2 during manufacture, the outer diameter D1 is, for example, in the range of 35 mm to 45 mm or 37 mm to 42 mm. Hereinafter, of the surfaces of the kitchen towel sheet 11x, the surface facing the outside of the roll 2 is referred to as the roll surface 11a, and the surface in contact with the core 10 of the roll 2 or facing the core 10 is referred to as the roll back surface 11b.

[0017] (Kitchen towel sheet) The kitchen towel sheet 11x of this embodiment is a two-ply laminate. In the kitchen towel sheet 11x, for example, an adhesive layer may be provided between the plies to prevent peeling of the plies. The adhesive layer may be provided over the entire surface between the plies, or may be provided only on a part of the surface. As the adhesive, any known adhesive that does not affect the water absorption and texture of the kitchen towel sheet may be used without any particular limitation, and examples of the adhesive include glue. The kitchen towel sheet 11x may be printed with color and / or black patterns, letters, etc.

[0018] (Basis weight of kitchen towel sheet) In this embodiment, the basis weight of the kitchen towel sheet 11x is, for example, 32 g / m for two plies from the viewpoint of water absorption, softness, etc. 2 More than 65g / m 2 Below range, 39g / m 2 More than 63g / m 2 The following range or 47g / m 2 More than 55g / m 2 The range is as follows: grammage 32 g / m 2 If the basis weight is less than 32 g / m, the texture of the kitchen towel sheet 11x during use will be deteriorated. 2 If the basis weight is less than 65 g / m, the water absorbency of the kitchen towel sheet 11x tends to decrease. 2 If the weight exceeds this value, the kitchen towel sheet 11x becomes hard and does not conform to the shape of the object, so that the wiping performance tends to decrease. The basis weight is measured in accordance with JIS P 8124.

[0019] (Water absorption capacity of kitchen towel sheet) In this embodiment, the water absorption capacity of the kitchen towel sheet 11x is, for example, 155 g / m 2 More than 520g / m 2 Below range, 180g / m 2 More than 400g / m 2 Below range or 200g / m 2 More than 260g / m 2 The range is as follows: 2 In the unit, "g" indicates the weight of absorbed water, and "m 2 " indicates the area of ​​the kitchen towel sheet 11x that has absorbed water. When the kitchen towel sheet 11x is made into a size that is easy to handle, the water absorption capacity is 155 g / m 2 If the water absorption capacity is less than 520 g / m, the sheet may not be able to wipe off water sufficiently. 2 If the amount of water absorbed exceeds this limit, the sheet cannot be used effectively and tends to have to be discarded even though it still has water absorption capacity.

[0020] The water absorption per gram of one ply of the kitchen towel sheet 11x is, for example, in the range of 2.5 g to 5.0 g, in the range of 2.6 g to 4.9 g, or in the range of 2.7 g to 4.0 g. When it is in the above range, the water absorption (g / m 2 ) can be easily adjusted to an appropriate range.

[0021] The amount of water absorption is measured, for example, as follows. First, a two-ply kitchen towel sheet 11x is taken and cut using a square template with each piece being 7.6 cm (3 inches) to prepare a rectangular test piece with each side being 7.6 cm. The mass of the test piece before water absorption is measured using an electronic balance. The test piece is set in the holder shown in Figure 7 (a jig that fixes three points of the test piece, the jig being made of a metal that does not absorb water).

[0022] Distilled water is poured to a depth of 2 cm in a commercially available tray, and the test piece set in the holder 220 is immersed in the distilled water for 2 minutes. After immersion for 2 minutes, the test piece and the holder are removed from the distilled water, and a band 210 is attached to one corner 200d of the test piece 200 as shown in FIG. 7. The band 210 is made by cutting the same kitchen towel sheet 11x as the sample to be measured into a size of 2 mm wide x 15 mm long, and attaching it to a part 6 mm from the corner 200d toward the center of the test piece. Next, the holder and the test piece 200 are hung from a rod installed in an empty water tank so that the corner 200a facing the corner 200d is on top, and the lid of the water tank is closed and left for 10 minutes. Thereafter, the holder 220 and the test piece 200 are removed from the water tank, the band 210 and the holder 220 are removed, and the mass of the test piece 200 is measured with an electronic balance. From the change in mass of the test piece 200 before and after immersion in distilled water, the mass of the test piece 1m 2 Absorption of distilled water per g of water / m of paper 2 ) is calculated. 2 Water absorption per g water / m 2 ) by the basis weight of the two plies of the test piece, 2 Water absorption per g water / m 2 ) / Basic weight (paper g / paper m 2 ) = Water absorption per gram (g water / g paper). Measurements are carried out five times for each sample, and the average value is used. This measurement is carried out according to the JIS P 8111 method, at a temperature of 23±1°C and a humidity of 50±2%. Distilled water is also kept at 23±1°C.

[0023] (Area of ​​kitchen towel sheet) For example, the area of ​​one kitchen towel sheet 11x is 0.02 m 2 More than 0.10m 2 Range below 0.03m 2 More than 0.08m 2 Within the range below or 0.04m 2 More than 0.06m 2The range is as follows. This area should not be set alone, but should be set in conjunction with the properties of kitchen towel sheet 11x, particularly basis weight and water absorption. Kitchen towel roll 2 may have multiple perforations at specified intervals in the length direction. These perforations extend in the width direction of kitchen towel sheet 11x and cut kitchen towel sheet 11x in the width direction. Here, the area enclosed by two perforations adjacent in the longitudinal direction is defined as the area per sheet of kitchen towel sheet 11x.

[0024] The surface area of ​​one 11x kitchen towel sheet is 0.02 m 2 If it is less than 0.10m, the workability and water absorption will decrease, wiping performance will decrease, and it will be difficult to wipe the object to be wiped, or one sheet will not be able to wipe it sufficiently. 2 If the sheet exceeds this limit, the sheet cannot be used effectively, and there is a tendency for the sheet to be wasted. More specifically, it would be good if one sheet could wipe one plate, but if the sheet has a high water absorption capacity, for example, 0.8 sheets can wipe one plate, and 0.2 sheets are wasted. If the area of ​​one sheet is reduced, the workability and water absorption capacity decrease, and wiping off water becomes insufficient. In this embodiment, by setting the optimal water absorption capacity and the like when the sheet area is set to be easy to work with, a highly convenient kitchen towel sheet 11x can be obtained.

[0025] (Softness of kitchen towel roll) From the viewpoint of transport efficiency, the winding softness of the kitchen towel roll 2 is, for example, in the range of 2 mm to 12 mm, 3 mm to 10 mm, or 4 mm to 8 mm. If the winding softness is less than 2 mm, the kitchen towel roll 2 becomes hard and difficult to deform, and therefore, when stored in a cardboard box, gaps tend to form at the four corners and between the rolls 2, reducing transport efficiency. If the winding softness exceeds 10 mm, the kitchen towel roll 2 becomes too soft and remains deformed even after being removed from the cardboard box, making it difficult to use in a holder.

[0026] The winding softness can be defined as the deformation amount of the paper towel roll 2 when a load of 625 g is applied to the paper towel roll 2 of this embodiment. More specifically, the winding softness is measured using a measuring device 40 shown in FIG. 9. The measuring device 40 includes a base portion 41, support rods 42a and 42b, a movable weight mounting plate 43, and a 625 g weight 44. The two support rods 42a and 42b rise vertically from the base portion 41, and both ends of the rectangular movable weight mounting plate 43 are provided with insertion holes for the support rods 42a and 42b. Then, the paper towel roll 11x is placed on the base portion 41 between the support rods 42a and 42b, and the support rods 42a and 42b are inserted into the movable weight mounting plate 43 from above the paper towel roll 11x, and the movable weight mounting plate 43 is placed on the upper surface of the paper towel roll 11x. The height of the movable weight mounting plate 43 in this state is defined as the initial height h 1 Furthermore, when weight 44 is placed on moving weight placement plate 43, moving weight placement plate 43 slides through support rods 42a and 42b due to the weight of weight 44, deforming and sinking paper towel roll 11x. 2 Measure (h 2 -h 1 ) is calculated as the deformation of the diameter of the paper towel roll 11x. Next, rotate the paper towel roll 11x 120 degrees, and calculate the winding softness by the same operation. Rotate it another 120 degrees, and repeat the same operation. The average of the three measurements is taken as the measured value.

[0027] (Kitchen towel roll diameter) The roll diameter of the kitchen towel roll 2 per roll is, for example, in the range of 113 mm to 200 mm, 135 mm to 180 mm, or 140 mm to 160 mm. If the roll diameter is less than 113 mm, it tends to be difficult to adjust the roll density and the water absorption amount of the kitchen towel sheet 11x to a good balance within a good range. In addition, the proportion of the outer diameter of the core 10 in the kitchen towel roll 2 increases, and transportation efficiency tends to decrease. If the roll diameter exceeds 200 mm, it tends to be difficult to use in a holder. In addition, the roll density and therefore the aesthetic appearance of the package tend to decrease.

[0028] (11x roll length of kitchen towel sheet) The length of the kitchen towel sheet 11x is not particularly limited, but from the viewpoint of the frequency of replacement of the roll 2, ease of carrying the product 1, etc., it is, for example, in the range of 50 m or less, 24 m to 45 m or less, or 27 m to 40 m or less. The thickness of the kitchen towel sheet 11x is not particularly limited, but from the viewpoint of ease of adjusting the basis weight and water absorption, strength, etc., it is, for example, in the range of 1.6 mm / 10 plies to 4.7 mm / 10 plies, 2.0 mm / 10 plies to 4.3 mm / 10 plies, or 2.5 mm / 10 plies to 4.0 mm / 10 plies. The paper thickness is measured using a thickness gauge (dial thickness gauge "PEACOCK (registered trademark)" manufactured by Ozaki Manufacturing Co., Ltd.). The measurement is performed with a measurement load of 3.7 kPa and a probe diameter of 30 mm, a sample is placed between the probe and the measurement table, and the gauge is read when the probe is lowered at a speed of 1 mm or less per second. Five sets of two-ply laminated kitchen towel sheets 11x are stacked, and measurements are taken for ten sheets. The measurements are repeated ten times and the results are averaged. The basis weight, water absorbency, thickness, etc. of kitchen towel sheet 11x can be adjusted to a predetermined range by, for example, appropriately adjusting the calendar conditions, embossing conditions, etc. of the base paper web.

[0029] (Kitchen towel roll density) In this embodiment, the kitchen towel roll 2 formed by winding the kitchen towel sheet 11x into a roll has a roll density of 0.04 g / cm 3 More than 0.15g / cm 3 The following range: 0.05g / cm 3 More than 0.13g / cm 3 Below the range or 0.06g / cm 3 More than 0.11g / cm 3 The range is as follows. It is necessary to set the roll density according to the basis weight and water absorption of the kitchen towel sheet 11x, rather than setting the roll density alone. 3If the roll density is less than 0.15 g / cm, the top and / or bottom surfaces may not be folded neatly when packaging the caramel, resulting in non-bonded areas and scorching, which may impair the cosmetic appearance. 3 If the roll diameter exceeds this value, the kitchen towel sheet may become crushed and the amount of water absorption may decrease if the roll diameter is constant.

[0030] The roll density can be measured, for example, by the following method. First, the roll volume is expressed as {{cross-sectional area of ​​the roll outer diameter (winding diameter DR) portion}-(cross-sectional area of ​​the core outer diameter DI portion)}×roll width (converted per 206 mm). For example, if the roll mass per 206 mm of roll width is 327 g, the winding diameter DR is 122 mm, and the core outer diameter is 39 mm, the roll density=327 g÷[{3.14×(122 mm÷2÷10) 2 -3.14×(39mm÷2÷10) 2}×(206mm÷10)]=0.15g / cm 3 In addition, if kitchen towel roll 2 does not have core 10, the diameter of the central hole is replaced with the core outer diameter DI.

[0031] (Embossed pattern on kitchen towel sheet) The kitchen towel sheet 11x may have an embossed pattern in addition to the uneven pattern derived from the papermaking machine. Such an embossed pattern can be easily formed, for example, by embossing. The kitchen towel sheet 11x of this embodiment may be one in which a single ply sheet is embossed and then two plies are laminated. When laminating two plies, it is preferable to use a ply bond glue (adhesive) and apply the glue to perform the bonding process. By bonding the two plies in this way, the adhesion of the plies becomes strong, and the kitchen towel sheet 11x is less likely to tear without peeling off even when it gets wet with water.

[0032] The ply on the front surface 11a of the kitchen towel sheet 11x is preferably provided with a dot-shaped embossed pattern. By providing the dot-shaped embossed pattern on the front surface 11a, the embossed portions of the embossed pattern can be applied with glue for adhesion treatment, which makes it difficult for the ply of the kitchen towel sheet 11x to peel off, and suppresses large fluctuations in the amount of water absorption.

[0033] In the embossed pattern, the size is 1 mm 2 More than 40mm 2 An embossment with the following area is considered as a single embossment: 100 cm2 of unit area in the embossing pattern 2 The number of embossed units per sheet is not particularly limited, but may be, for example, in the range of 20 to 1800, 50 to 1000, or 80 to 500. According to the inventor's research, it has been found that the area and number of embossed units affect the water absorption of the kitchen towel sheet 11x and the winding softness of the roll 2. Therefore, by appropriately selecting the area and number of embossed units, the water absorption of the kitchen towel sheet 11x can be set within a predetermined range, and the water absorption can be maintained even when the roll 2 is compressed and stored in a cardboard box. If the number of embossed units is less than 20, the plies of the kitchen towel sheet 11x tend to peel off from each other. If the number of embossed units exceeds 1800, the kitchen towel sheet 11x tends to be crushed and the water absorption rate tends to decrease. In addition, the shape of the embossed units can be circular, elliptical, rectangular, square, floral, etc., without any particular restrictions. Furthermore, the unevenness created by the papermaking machine ensures that the water absorption capacity does not decrease even when the paper is crushed and placed in a cardboard box, and by optimizing the size and number of the embossments, the water absorption capacity does not decrease.

[0034] In addition, the embossed pattern has a size of 1 mm 2 More than 40mm 2The depth of the embossed unit, which is the area below, is, for example, in the range of 0.10 mm to 0.80 mm, 0.25 mm to 0.67 mm, or 0.35 mm to 0.55 mm. If the depth of the embossed unit of the kitchen roll towel 11x is less than 0.10 mm, the water absorption of the kitchen towel sheet 11x tends to decrease and the touch during use tends to be inferior, while if it exceeds 0.80 mm, the kitchen towel sheet 11x tends to become bulky, the roll density tends to decrease, and the cosmetic properties of the package tend to decrease.

[0035] The area and depth of the embossment are measured using a microscope. The microscope used is a Keyence One-Shot 3D Measuring Macroscope VR-3100. The microscope image observation, measurement, and image analysis software can be the VR-H1A. The 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.

[0036] As shown in Figure 3, the area of ​​the embossment is calculated by measuring the length a of the longest part of the periphery fr of the embossment and the length b of the longest part in the direction perpendicular to the length a, and calculating the area as a x b. Figure 4 shows a height profile on the XY plane taken with a microscope, with the height of the sheet surface being represented by shading. The roughly elliptical areas in Figure 4, which are shaded differently from the surrounding area, indicate the individual embossments, and the length a of the longest part of one of these embossments can be visually identified. Of these, the area of ​​1 mm 2 More than 40mm 2 The following embossing units are 100cm 2 Count the number of pieces per piece.

[0037] The number of embossments is measured by measuring the total area between two adjacent perforations in the longitudinal direction across the entire width of the sheet at any 100 cm 2 Select a part of the material that is knurled (edge ​​embossed) and measure it visually. 2If you cannot select the area, measure the number of embosses on the measurable areas, excluding areas that cannot be measured due to knurling (edge ​​embossing) processing, etc., and measure the number of embosses on 100 cm 2 The number of embossments per unit is calculated.

[0038] Next, the area is 1 mm 2 More than 40mm 2 The embossing depth is measured for the following embossing units. The embossing depth is obtained by measuring the height difference of the embossing using the above microscope. First, draw a line segment AB as shown in Figure 4 to obtain the height profile shown in Figure 5. Note that the line segment AB should be drawn so as to cross the embossing. The height profile is a (measured) cross-sectional curve S that represents the unevenness of the actual sheet sample surface, but it also contains noise (steep peaks due to fiber clumps on the sheet surface, fibers stretching out like whiskers, and areas without fibers), and it is necessary to remove such noise peaks when calculating the height difference of the unevenness.

[0039] Then, as shown in FIG. 6, a "contour curve" W is calculated from the cross-sectional curve S of the height profile, and the difference between the average value of the bottoms P1 and P2 and the apex sandwiched between the bottoms P1 and P2 is calculated from the contour curve W, and this is set as the emboss depth D1. Similarly, the difference between the average value of the bottoms P2 and P3 and the apex sandwiched between the bottoms P2 and P3 is calculated, and this is set as the emboss depth D2. Similarly, D3 is measured. Note that D1, D2, and D3 are measured at consecutive locations as shown in FIG. 6. This measurement is performed at 10 locations on the kitchen towel sheet 11x, and the average value of the data at a total of 30 locations is set as the emboss depth. Note that if the distance between the embosses (the distance between P1 and P2) is 1 cm or more, the measurement is not performed at consecutive locations, but the difference between the average value of the bottoms P1 and P2 and the apex sandwiched between the bottoms P1 and P2 is calculated, and this is set as the emboss depth D1. D1 may be measured at 30 locations, and the average value may be set as the emboss depth.

[0040] The "contour curve" is a curve obtained by removing surface roughness components with wavelengths shorter than λc:800μm (where λc is the "filter that defines the boundary between roughness and waviness components" as described in JIS B 0601 "3.1.1.2") from the cross-sectional curve using a low-pass filter. Note that if λc is set to be greater than the distance between adjacent embossments P1 and P2, and P2 and P3 (called the emboss pitch), there is a possibility that the peaks will be recognized as noise, so λc is set to be less than the emboss pitch. For example, if the emboss pitch is 800μm or less, λc is set to, for example, 250μm.

[0041] When measuring the embossment, the measurement surface is the front side, and when selecting the embossment, the measurement is made at a portion that is 10% of the roll length of kitchen towel roll 1 from the outer end of kitchen towel roll 1 (the position where use of kitchen towel sheet 11x begins). For example, if the roll length is 30 m, the measurement is made at a portion that is 30 m x 10% = 3 m from the end. Note that if the 10% portion of the roll length corresponds to a perforation, the outer side of the perforation is measured.

[0042] The ply on the back surface 11b of the kitchen towel sheet 11x is not particularly limited as to whether it has an embossed pattern, so long as it has a pattern of protrusions and recesses derived from the papermaking process that is different from the embossed pattern. It may have nested embossing or pin-to-pin embossing, or may not be embossed, but is preferably nested embossing or no embossing, and more preferably no embossing.

[0043] (Packaging film) As the packaging film 20, for example, a resin film having heat sealability is used. The thickness of the packaging film is, for example, in the range of 15 μm to 40 μm, 20 μm to 35 μm, or 25 μm to 30 μm. If the thickness is less than 15 μm, scorching occurs during heat sealing, which tends to reduce the aesthetic appearance or the film is likely to break. If the thickness exceeds 40 μm, the ease of opening tends to decrease. The packaging film 20 is not particularly limited as long as it has heat sealability, but for example, a polyethylene film is preferable. The thickness of the film is measured based on JIS Z1702.

[0044] In addition to the above-mentioned physical properties, the kitchen towel sheet 11x of this embodiment preferably has the following physical properties. (DMDT and DCDT) The dry machine direction tensile strength (DMDT) of the kitchen towel sheet 11x based on JIS P 8113 is, for example, in the range of 5 N / 25 mm to 24 N / 25 mm, 8 N / 25 mm to 19 N / 25 mm, or 10 N / 25 mm to 16 N / 25 mm, from the viewpoint of wiping ability, etc. The dry cross direction tensile strength (DCDT) is, for example, in the range of 3 N / 25 mm to 19 N / 25 mm, 5 N / 25 mm to 14 N / 25 mm, or 6 N / 25 mm to 12 N / 25 mm, from the viewpoint of wiping ability, etc. If the DMDT is less than 5 N / 25 mm or the DCDT is less than 3 N / 25 mm, the kitchen towel sheet 11x tends to tear easily when absorbing water, resulting in reduced wiping properties. If the DMDT exceeds 24 N / 25 mm or the DCDT exceeds 19 N / 25 mm, the density of the kitchen towel sheet 11x tends to increase, resulting in reduced wiping properties as the water absorption decreases, or the sheet tends to become hard and the wiping properties tend to decrease.

[0045] (WMDT and WCDT) The wet machine direction tensile strength (WMDT) of the kitchen towel sheet 11x based on the old JIS S 3104 is, for example, in the range of 1.3 N / 25 mm to 7.0 N / 25 mm, 2.0 N / 25 mm to 6.0 N / 25 mm, or 2.5 N / 25 mm to 5.0 N / 25 mm, from the viewpoint of wiping properties, etc. The wet cross direction tensile strength (WCDT) is, for example, in the range of 0.7 N / 25 mm to 5.5 N / 25 mm, 1.0 N / 25 mm to 4.0 N / 25 mm, or 1.8 N / 25 mm to 3.5 N / 25 mm, from the viewpoint of wiping properties, etc. If the WMDT is less than 1.3 N / 25 mm or the WCDT is less than 0.7 N / 25 mm, the kitchen towel sheet 1x tends to break easily when absorbing water, and the wiping properties tend to decrease. If the WMDT exceeds 7.0 N / 25 mm or the WCDT exceeds 5.5 N / 25 mm, the density of the kitchen towel sheet 11x increases, and the wiping properties tend to decrease with the decrease in water absorption, or the sheet becomes hard and the wiping properties tend to decrease.

[0046] (specific volume of kitchen towel sheet) The specific volume of the kitchen towel sheet 11x is, for example, 6 cm 3 / g or more 16cm 3 / g range, 7cm 3 / g or more 15cm 3 / g or less or 9cm 3 / g or more 13cm 3 / g or less. The specific volume of the kitchen towel sheet 11x is 6 cm 3 If the thickness is less than 16 cm / g, the water absorption capacity and the feel when used of the kitchen towel sheet 11x tend to decrease. 3 If the specific volume exceeds 1 / g, the kitchen towel sheet 11x becomes bulky, the feel during use deteriorates, and the improvement in water absorption tends to be insufficient. Note that the specific volume is calculated by dividing the paper thickness of the kitchen towel sheet 11x by the basis weight, and expressing the volume cm per unit g. 3The value is expressed as:

[0047] (Ply Peel Strength) The ply peel strength of the kitchen towel sheet 11x is, for example, in the range of 0.05 N / 75 mm to 2.0 N / 75 mm, 0.10 N / 75 mm to 1.5 N / 100 mm, or 0.15 N / 75 mm to 1.0 N / 75 mm. If the ply peel strength is less than 0.05 N / 75 mm, the plies will peel off from each other, making wiping difficult, and if the ply peel strength exceeds 2.0 N / 75 mm, the water absorption of the kitchen towel sheet 1x will be poor.

[0048] The method for measuring the ply peel strength is based on the tensile test method of JIS P 8113, using a tensile tester (STB-1225S, manufactured by A&D Co., Ltd.), and is performed under the standard conditions specified in JIS P 8111. First, a test piece of 75 mm in the width direction and 200 mm in the machine direction is taken from a sample of kitchen towel sheet 11x. Next, the ply is peeled off 35 mm in the machine direction. One side of the peeled ply is clamped and fixed 15 mm in the machine direction by the upper grip (width 75 mm). The other ply is also clamped and fixed 15 mm in the machine direction by the lower grip (width 75 mm). The pitch (spacing) of the grippers is 20 mm. Next, the specimen is pulled (peeled off) at a tensile speed of 100 mm / min, and strength data is collected. Strength data is obtained every 20 μm, and the data from 40 mm to 150 mm (measurement length 110 mm) after the start of measurement is averaged to determine the peel strength (N / 75 mm). However, if the perforation is included in the distance from 40 mm to 150 mm after the start of measurement, the distance from the start of measurement can be shortened from 40 mm to, for example, 90 mm (measurement length 50 mm) as long as it does not include the perforation.

[0049] (Method of manufacturing kitchen towel sheets and kitchen towel rolls) The kitchen towel sheet 11x and the kitchen towel roll 2 can be manufactured, for example, in the following order: (1) papermaking and creping, (2) embossing, and (3) roll winding. It is preferable not to use through-air dryer technology in the manufacturing process. Each step will be described below.

[0050] In the papermaking process, a rugged pattern derived from the papermaking process, which is different from the above-mentioned embossed pattern, is applied to the kitchen towel sheet 11x. The kitchen towel sheet 11x has a higher water absorption capacity due to the rugged pattern. The rugged pattern derived from the papermaking process means that the rugged pattern is applied between the head box of the papermaking machine and the entrance of the Yankee dryer in the papermaking process of the kitchen towel sheet 1x. Specifically, in a part of the papermaking process shown in FIG. 8, the rugged pattern can be applied by the belt press section 30, which is disposed between the dewatering roll 31 and the Yankee dryer 32. In the belt press section 30, the wet paper 34 and the rugged belt 33 (the rugged belt 33 loops between the belt press section 30 and the Yankee dryer 32) are pressed together, so that the rugged pattern can be applied to the wet paper.

[0051] The uneven pattern can be changed as needed by changing the belt pattern (fine pattern, coarse pattern). Changing the uneven pattern changes the specific volume (paper thickness), but it is preferable to select a pattern that brings the specific volume (paper thickness) of the base paper within the numerical range described below.

[0052] At this time, the basis weight of two plies of base paper used in the manufacture of the kitchen towel sheet 11x is, for example, 33 g / m 2 More than 68g / m 2 Below range, 39g / m 2 More than 63g / m 2 Below range or 47g / m 2 More than 55g / m 2 The paper thickness is in the range of 1.3 mm / 10 sheets or more and 4.5 mm / 10 sheets or less, 1.7 mm / 10 sheets or more and 3.5 mm / 10 sheets or less, or 2.0 mm / 10 sheets or more and 3.0 mm / 10 sheets or less. Furthermore, the specific volume is 6 cm3 / g or more 16cm 3 / g range, 7cm 3 / g or more 15cm 3 / g or less or 9cm 3 / g or more 13cm 3 / g or less. In order to improve water absorption, the thickness of kitchen towel sheet 11x is preferably greater than the thickness of the base paper, and the specific volume of kitchen towel sheet 11x is preferably greater than the specific volume of the base paper.

[0053] The kitchen towel roll 2 thus obtained is wrapped in a wrapping film 20 in a known manner, for example in a caramel wrap style as shown in FIG. 1, with one or more of the rolls aligned in the longitudinal direction and arranged in parallel in the width direction.

[0054] It goes without saying that the present invention is not limited to the above-described embodiments, but covers various modifications and equivalents within the spirit and scope of the present invention. EXAMPLES

[0055] Kitchen towel roll products of Examples 1 to 21 and Comparative Examples 1 to 10 were manufactured through the steps of (1) papermaking and creping, (2) embossing, (3) roll winding, and (4) caramel packaging. Parameters were measured and sensory evaluation was performed for all the kitchen towel roll products of the above Examples and Comparative Examples. The results are shown in Tables 1 to 5. The kitchen towel sheets of Examples 1 to 21 and Comparative Examples 1 to 10 had uneven patterns derived from the papermaking machine.

[0056] The sensory evaluation was carried out by 20 monitors who chose "good" or "bad" for each evaluation item. The evaluation criteria are as follows: ◎, ○, and △ were considered to be acceptable. ◎: When 18 to 20 people answered "Good" ○: When 14 to 17 people answered "Good" △: When 10 to 13 people answered "Good" ×: When 6 to 9 people answered "Good" ××: When there are no "good" people or when there are 1 to 5 people

[0057] Each evaluation item will be explained. <Water absorption amount per sheet (in each table, it is written as "Water absorption amount / sheet")> The monitors evaluated how much water remained on the surface after using one sheet. <Can the sheets be used without waste? (In each table, this is referred to as "efficiency") The test subjects used one sheet and evaluated whether they felt it was a waste to throw it away. <Holder suitability> The ease of use when placing a kitchen towel roll in the holder was evaluated. <Transportation efficiency> The size of the gap when kitchen towel rolls were stored in a cardboard box was evaluated. <Wipeability> The ease of wiping was evaluated when the monitors used the product. The results are shown in Tables 1 to 3.

[0058] [Table 1]

[0059] [Table 2]

[0060] [Table 3]

[0061] As described above, according to the present invention, by adjusting the basis weight, water absorption amount, winding softness of the kitchen sheet roll, etc. of the kitchen towel sheet within a predetermined range, it is possible to improve transportation efficiency while maintaining the water absorption and holder suitability of the kitchen towel sheet at a high level. [Explanation of symbols]

[0062] 1. Kitchen towel roll products 2 kitchen towel rolls 10 cores 20 Packaging film 11a surface 11b Back side 11x kitchen towel sheets 30 Belt Press Section 31 Dewatering roll 32 Yankee Dryer 33 Concave and Convex Belt 34 Wet Paper 40 Roll softness measuring device 41 Base 42a,42b Support rod 43 Moving weight support plate 44 Weight 200 specimens 200a, 200d corner 210 Obi 220 Holder

Claims

1. A kitchen towel roll product comprising a kitchen towel roll in which a sheet-shaped kitchen towel that is a two-ply laminate is wound into a roll, and a packaging film for packaging the kitchen towel roll, The kitchen towel is The papermaking machine has an uneven pattern provided between the head box and the Yankee dryer inlet of the papermaking machine, and The kitchen towel is The paper has an embossed pattern different from the uneven pattern derived from the papermaking machine, and the depth of the embossed pattern is 0.10 mm or more and 0.80 mm or less, The kitchen towel roll has a roll length of 24 m or more and 45 m or less, The kitchen towel roll has a roll diameter of 113 mm or more and 200 mm or less, The specific volume of the kitchen towel is 6 cm ３ / g or more 16cm ３ / g or less, The kitchen towel roll is The kitchen towel further includes a plurality of perforations arranged at predetermined intervals in the length direction and extending in the width direction for cutting the kitchen towel in the width direction; The kitchen towel roll product, wherein the area of ​​the kitchen towel surrounded by two adjacent perforations in the longitudinal direction is 0.02 m2 or more and 0.10 m2 or less.

2. The embossing pattern includes a plurality of embossing units, The area of ​​the embossed portion is 1 mm ２ More than 40mm ２ The unit area of ​​the embossed unit is 100 cm or less. ２ 2. The kitchen towel roll product of claim 1, wherein the number of pieces per unit is between 20 and 1800.

3. The water absorption capacity of the kitchen towel is 155 g / m ２ 520g / m or more ２ 3. The kitchen towel roll product of claim 1 or 2, wherein:

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