Kitchen towel roll product

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 Art

[0002] Due to the shortage of truck drivers, the soaring logistics costs, and the increase in CO 2 emission, etc., the efficiency of logistics has become important. Generally, for roll-type products such as kitchen towel rolls and toilet paper rolls, when they are transported in a cardboard box close to a cube, there will be spaces at the four corners, resulting in losses. Recently, pallet transportation is becoming the mainstream instead of loose loading on trucks, and even a difference of just a few centimeters in the cardboard box can greatly affect the loading efficiency.

[0003] Therefore, for toilet paper roll products, in order to improve the transportation efficiency, products with a longer roll length, more compact than before, or products transported with the core crushed have been proposed. However, the compact products have problems such as a narrow paper width and poor usability. Also, if the core is crushed, it becomes difficult to mount on the holder. In the case of kitchen towel rolls, there are long products, but it is difficult to balance with the water absorption capacity. Also, if the winding tightness of the kitchen towel roll is softened and then inserted into the cardboard box while being compressed, space will not be wasted, but there are problems such as the embossing being crushed and the water absorption capacity decreasing, or the roll deforming into a square and becoming difficult to use when placed in the holder.

[0004] Patent Document 1 discloses a kitchen towel roll in which characteristics such as the density of embossed convex portions, 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 when its winding length becomes longer. Further, the kitchen towel roll of Patent Document 1 is not easily crushed in the thickness direction and is not soft (paragraph 0011). It is not clear from the prior art such as Patent Document 1 that by adjusting the predetermined characteristics of the kitchen towel roll within a predetermined range, it is possible to improve the transport efficiency while suppressing a decrease in absorbency due to compression of the kitchen towel roll.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the process of researching to improve the transportation efficiency of kitchen towel rolls, the inventors considered the softness and roll diameter of kitchen towel rolls and obtained the following findings. When a kitchen towel roll that is close to a cylindrical shape is stored in a rectangular or cubic cardboard box, the gap between the kitchen towel rolls becomes large, resulting in a decrease in transportation efficiency. On the other hand, when the kitchen towel roll is soft and easily deformed, the quantity of kitchen towel rolls that can be stored in the cardboard box increases, or a smaller cardboard box can be used to store the same quantity. However, if the kitchen towel roll is deformed too much, it will remain deformed even after being taken out of the cardboard box, making it very difficult to use when placed in a holder, and the water absorption of the kitchen towel roll may decrease. Also, when the roll diameter of the kitchen towel roll is small or the roll length is short, the ratio of the outer diameter of the core to the outer diameter of the kitchen towel roll becomes large, resulting in poor transportation efficiency. Based on such findings, the inventors conducted further research.

[0007] An object of the present invention is to provide a kitchen towel roll product that does not have a decrease in water absorption and has holder suitability even when compressed to improve transportation efficiency.

Means for Solving the Problems

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

[0009] (1) A kitchen towel roll product comprising a kitchen towel in the form of a sheet-like 2-ply laminate wound into a roll, and a packaging film for packaging the kitchen towel roll, wherein the kitchen towel has an uneven pattern derived from a paper machine applied between the headbox of the paper machine and the Yankee dryer inlet, and the basis weight of the 2-ply is 32 g / m 2 or more and 65 g / m 2 or less, and the water absorption amount is 155 g / m2 520 g / m² or less 2 A kitchen towel roll product having a weight of 520 g / m² or less and a winding softness of the kitchen towel roll of 2 mm or more and 12 mm or less. (2) The kitchen towel roll product according to (1) above, wherein the winding diameter of the kitchen towel roll is 113 mm or more and 200 mm or less. (3) The kitchen towel further has an embossing pattern different from the uneven pattern, together with the uneven pattern derived from the paper machine. The embossing pattern includes a plurality of embossing units, and the area of each embossing unit is 1 mm 2 or more and 40 mm 2 or less, and the depth is 0.10 mm or more and 0.80 mm or less. The kitchen towel roll product according to any one of (1) to (3) above. (4) The embossing pattern has 20 or more and 1800 or less embossing units per 100 cm² of the unit area of each embossing unit. The kitchen towel roll product according to (4) above. 2 (5) The kitchen towel roll is provided with a plurality of perforations at predetermined intervals in the length direction and extending in the width direction for cutting the kitchen towel in the width direction. The area of the kitchen towel surrounded by two adjacent perforations in the longitudinal direction is 0.02 m 2 or more and 0.10 m 2 or less. The kitchen towel roll product according to any one of (1) to (4) above.

Advantages of the Invention

[0010] According to the present invention, there is provided a kitchen towel roll product that has water absorption without reduction even when compressed to improve transport efficiency and has holder suitability.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Mode for Carrying Out the Invention

[0012] Hereinafter, the kitchen towel roll product 1 of the present embodiment will be described in detail with reference to the following drawings. FIG. 1 shows the appearance of the kitchen towel roll product 1 according to the first embodiment. FIG. 2 shows the appearance of the kitchen towel roll 2. FIG. 3 shows how to obtain the embossed area of the kitchen towel. FIG. 4 is a height profile on the X-Y plane by a microscope. FIG. 5 is a graph showing the height profile on the X-Y plane by a microscope. FIG. 6 is an emboss unit having an area of 1 mm 2 or more and 40 mm 2 or less showing how to obtain the depth. FIG. 7 shows a method for measuring the water absorption of the kitchen towel 11x. FIG. 8 shows a part of the papermaking process of the kitchen towel 11x. FIG. 9 is a schematic side view of a device for measuring the softness of winding of the kitchen towel roll 11x.

[0013] <Kitchen Towel Roll Product> As shown in FIGS. 1 and 2, the kitchen towel roll product 1 of the present embodiment is a two-ply laminate and has an uneven pattern derived from a paper machine, and is a sheet-shaped kitchen towel 11x (hereinafter also referred to as "kitchen towel sheet 11x") having a basis weight and a water absorption amount within a predetermined range wound around a core 10 such as a paper tube or a plastic tube. Two kitchen towel rolls 2 (hereinafter also simply referred to as "rolls 2") aligned in the longitudinal direction are caramel-wrapped with a packaging film 20 to form a caramel package.

[0014] Here, the uneven pattern derived from the paper machine is an uneven pattern automatically applied between the headbox of the paper machine and the Yankee dryer inlet. When the uneven pattern derived from the paper machine is combined with the predetermined basis weight, water absorption amount, and winding softness of the roll 2 defined in the present embodiment, it has been found by the research of the present inventors that it is difficult to be crushed even when pressed from the outside. Examples of the external pressure include a compressive force when the roll 2 is stored in a cardboard box.

[0015] The kitchen towel roll product 1 of the present embodiment is a package of two kitchen towel rolls 2, but the number of packages is not particularly limited and may be any number. For example, it may be in the range of 1 or more and 4 or less, 1 or more and 2 or less, or 1. In the case of a plurality, from the viewpoint of the aesthetics of the package, etc., it is preferably 2 or 3. By caramel-wrapping the kitchen towel roll 2, it is difficult for seal defects or scorch (holes due to burning) to occur, and the aesthetics of the package are significantly improved. Also, because it is a caramel package, it is excellent in strength and openability. Although the kitchen towel roll 2 of the present embodiment is caramel-wrapped, it is not limited thereto, and any of gusset packaging, pillow packaging, shrink packaging, two-side seal packaging, etc. may be used.

[0016] The outer diameter D1 of the core 10 of the roll 2 is not particularly limited, but from the viewpoints of facilitating the adjustment of the winding density of the roll 2 and the handleability of the roll 2 during manufacturing, etc., for example, it is in the range of 35 mm or more and 45 mm or less, or in the range of 37 mm or more and 42 mm or less. Hereinafter, among the surfaces of the kitchen towel sheet 11x, the surface facing the outside of the roll 2 is defined as the roll surface 11a, and the surface in contact with the core 10 of the roll 2 or facing the core 10 is defined as the roll back surface 11b.

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

[0018] (Grammage of kitchen towel sheet) In the present embodiment, from the viewpoints of water absorption amount, softness, etc., the grammage of the kitchen towel sheet 11x is such that the grammage of the two plies is, for example, 32 g / m 2 or more and 65 g / m 2 or less, in the range of 39 g / m 2 or more and 63 g / m 2 or less, or in the range of 47 g / m 2 or more and 55 g / m 2 or less. If the grammage is less than 32 g / m 2 , the touch feeling of the kitchen towel sheet 11x during use deteriorates. Also, if the grammage is less than 32 g / m 2 , the water absorption of the kitchen towel sheet 11x tends to decrease. If the grammage exceeds 65 g / m 2 , the kitchen towel sheet 11x becomes hard and does not follow the shape of the object, so the wiping property tends to decrease. The grammage is measured based on JIS P 8124.

[0019] (Water absorption of the kitchen towel sheet) In this embodiment, the water absorption of the kitchen towel sheet 11x is, for example, 155 g / m 2 or more and 520 g / m 2 or less, 180 g / m 2 or more and 400 g / m 2 or less, or 200 g / m 2 or more and 260 g / m 2 or less. Here, in the unit of "g / m 2 ", "g" indicates the weight of the 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 with good handleability, if the water absorption is less than 155 g / m 2 , it tends to be unable to wipe off water sufficiently with one sheet. If the water absorption exceeds 520 g / m 2 , the sheet cannot be used effectively, and there is a tendency that it has to be discarded although there is still room to absorb water.

[0020] The water absorption per gram of 1 ply of the kitchen towel sheet 11x is, for example, in the range of 2.5 g or more and 5.0 g or less, 2.6 g or more and 4.9 g or less, or 2.7 g or more and 4.0 g or less. When it is in the above range, it is easy to adjust the water absorption (g / m 2 ) of the kitchen towel sheet 11x to an appropriate range.

[0021] The measurement of water absorption is carried out, for example, as follows. First, a kitchen towel sheet 11x stacked in 2 plies is sampled, and cut using a template with a square of 7.6 cm (3 inches) on one side to produce a test piece in the shape of a rectangle with a side of 7.6 cm. Measure the mass of the test piece before water absorption with an electronic balance. Set the test piece in the holder shown in Fig. 7 (a jig for fixing three points of the test piece, and the jig is made of a metal that does not absorb moisture).

[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 2It is within the following range. Instead of setting this area alone, it is necessary to set it in combination with the characteristics of the kitchen towel sheet 11x, particularly the basis weight and water absorption. The kitchen towel roll 2 may be provided with a plurality of perforations at predetermined intervals in the length direction. These perforations extend in the width direction of the kitchen towel sheet 11x and cut the kitchen towel sheet 11x in the width direction. Here, the area surrounded by two adjacent perforations in the longitudinal direction is defined as the area per sheet of the kitchen towel sheet 11x.

[0024] If the area per sheet of the kitchen towel sheet 11x is less than 0.02 m 2 there is a tendency for workability and water absorption to decrease, wiping performance to deteriorate, making it difficult to wipe the object to be wiped or unable to sufficiently wipe with one sheet. If it exceeds 0.10 m 2 there is a tendency for the sheet not to be used up effectively and for sheet loss to occur. More specifically, for example, it should be possible to wipe one dish with one sheet, but if the water absorption of the sheet is high, it may be possible to wipe one dish with, for example, 0.8 sheets, and at this time 0.2 sheets of the sheet are wasted. If the area of one sheet is reduced, workability and water absorption will decrease, and water wiping will also become insufficient. In this embodiment, by setting the optimal water absorption and the like when the sheet area has good workability, a highly convenient kitchen towel sheet 11x can be obtained.

[0025] (Softness of the kitchen towel roll) The softness of the kitchen towel roll 2 is, from the viewpoint of transportation efficiency and the like, for example, in the range of 2 mm or more and 12 mm or less, 3 mm or more and 10 mm or less, or 4 mm or more and 8 mm or less. If the softness is less than 2 mm, the kitchen towel roll 2 becomes hard and difficult to deform. When stored in a cardboard box, gaps are generated at the four corners and between the rolls 2, and the transportation efficiency tends to decrease. If the softness exceeds 10 mm, the kitchen towel roll 2 becomes too soft and remains deformed even after being taken out of the cardboard box, making it difficult to use in a holder.

[0026] The winding softness can be defined as the amount of deformation of the paper towel roll 2 in the present embodiment when a load of 625 g is applied thereto. More specifically, the winding softness is measured using the measuring device 40 shown in FIG. 9. The measuring device 40 includes a base portion 41, support rods 42a and 42b, a moving weight placing plate 43, and a 625 g weight 44. The two support rods 42a and 42b stand vertically from the base portion 41, and insertion holes to the respective support rods 42a and 42b are provided at both ends of the rectangular moving weight placing plate 43. Then, the paper towel roll 11x is placed on the base portion 41 between the respective support rods 42a and 42b. The support rods 42a and 42b are inserted through the moving weight placing plate 43 from above the paper towel roll 11x, and the moving weight placing plate 43 is placed on the upper surface of the paper towel roll 11x. The height of the moving weight placing plate 43 in this state is defined as the initial height h 1 Let it be so. Further, when the weight 44 is placed on the moving weight placing plate 43, the moving weight placing plate 43 slides through the respective support rods 42a and 42b due to the weight of the weight 44, and the paper towel roll 11x is deformed and sinks. Therefore, the height h 2 at this time is measured, and (h 2 - h 1 ) is obtained as the amount of deformation of the diameter of the paper towel roll 11x. Next, the paper towel roll 11x is rotated by 120 degrees, and the winding softness is calculated by the same operation. Further, it is rotated by 120 degrees and the same operation is performed. The average value of the three times is taken as the measured value.

[0027] (Winding diameter of the kitchen towel roll) The winding diameter per roll of the kitchen towel roll 2 is, for example, in the range of 113 mm or more and 200 mm or less, in the range of 135 mm or more and 180 mm or less, or in the range of 140 mm or more and 160 mm or less. When the winding 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 well within a good range. In addition, the ratio of the outer diameter of the core 10 in the kitchen towel roll 2 increases, and the transport efficiency tends to decrease. When the winding diameter exceeds 200 mm, it tends to be difficult to use for a holder. In addition, the roll density and thus the cosmetic appearance of the packaging tend to decrease.

[0028] (Roll length of the kitchen towel sheet 11x) The roll length of the kitchen towel sheet 11x is not particularly limited. However, from the viewpoints of the replacement frequency of Roll 2 and the ease of handling of Product 1, etc., for example, it is in the range of 50 m or less, in the range of 24 m or more and 45 m or less, or in the range of 27 m or more and 40 m or less. The thickness of the kitchen towel sheet 11x is not particularly limited. However, from the viewpoints of the ease of adjusting the basis weight and water absorption amount, strength, etc., for example, it is in the range of 1.6 mm / 10 ply or more and 4.7 mm / 10 ply or less, in the range of 2.0 mm / 10 ply or more and 4.3 mm / 10 ply or less, or in the range of 2.5 mm / 10 ply or more and 4.0 mm / 10 ply or less. The paper thickness is measured using a thickness gauge (dial thickness gauge "PEACOCK (registered trademark)" manufactured by Ozaki Seisakusho Co., Ltd.). The measurement is carried out with a measurement load of 3.7 kPa and a measuring head diameter of 30 mm. A sample is placed between the measuring head and the measuring table, and the gauge is read when the measuring head is lowered at a speed of 1 mm or less per second. Five sets of the kitchen towel sheet 11x laminated with 2 plies are stacked and measured as 10 sheets. Further, the measurement is repeated 10 times and the measurement results are averaged. Incidentally, the basis weight, water absorption, thickness, etc. of the kitchen towel sheet 11x can be made within a predetermined range by appropriately adjusting, for example, the calendar conditions and embossing conditions of the base paper web.

[0029] (Roll density of the kitchen towel roll) In this embodiment, in the kitchen towel roll 2 in which the kitchen towel sheet 11x is wound in a roll shape, the roll density is 0.04 g / cm 3 or more and 0.15 g / cm 3 or less, in the range of 0.05 g / cm 3 or more and 0.13 g / cm 3 or less, or in the range of 0.06 g / cm 3 or more and 0.11 g / cm 3 or less. It is necessary to set the roll density according to the basis weight and water absorption amount of the kitchen towel sheet 11x, rather than setting the roll density alone. When the roll density is 0.04 g / cm 3If it is less than this value, when wrapping the caramel, the top surface and / or the bottom surface cannot be neatly folded, resulting in unbonded parts or scorching, which may impair the cosmetic appearance. When the roll density is less than 0.15 g / cm 3 If it exceeds this value, when the roll diameter is constant, the kitchen towel sheet may be crushed and the water absorption may decrease.

[0030] The roll density can be measured, for example, by the following method. First, the roll volume is expressed as {{the cross-sectional area of the outer diameter (roll diameter DR) part of the roll}-(the cross-sectional area of the core outer diameter DI part)}×roll width (converted to per 206 mm). For example, when the roll mass per 206 mm of roll width is 327 g, the roll diameter DR is 122 mm, and the outer diameter of the core is 39 mm, the roll density = 327 g÷[{3.14×(122 mm÷2÷10) 2 -3.14×(39 mm÷2÷10) 2}×(206 mm÷10)] = 0.15 g / cm 3 In this case, when there is no core 10 in the kitchen towel roll 2, the diameter of the center hole is replaced with the core outer diameter DI.

[0031] (The embossing pattern of the kitchen towel sheet) The kitchen towel sheet 11x may have an embossing pattern in addition to the uneven pattern derived from the paper machine. Such an embossing pattern can be easily formed, for example, by embossing. Also, the kitchen towel sheet 11x in this embodiment may be formed by laminating two plies after embossing a single-ply sheet. When laminating two plies, it is preferable to use a ply bond glue (adhesive) and apply the glue for adhesion treatment. By adhering in this way to make it two plies, the adhesion between the plies becomes stronger, and the kitchen towel sheet 11x is less likely to tear without ply separation even when wet with water.

[0032] On the ply of the surface 11a of the kitchen towel sheet 11x, a dot-shaped embossed pattern is preferably provided. By providing the dot-shaped embossed pattern on the surface 11a, glue can be applied to the embossed portions of the embossed pattern for adhesion treatment, making it less likely for the ply of the kitchen towel sheet 11x to peel off and suppressing large fluctuations in water absorption.

[0033] In the embossed pattern, the emboss having an area of 1 mm 2 or more and 40 mm 2 or less is taken as an individual emboss. The number of individual embosses per 100 cm 2 of the unit area in the embossed pattern is not particularly limited. For example, it is in the range of 20 or more and 1800 or less, the range of 50 or more and 1000 or less, or the range of 80 or more and 500 or less. According to the research of the present inventor, it has been found that the area and number of the embosses affect the water absorption of the kitchen towel sheet 11x and the softness of winding of the roll 2. Therefore, by appropriately selecting the area and number of the embosses, the water absorption of the kitchen towel sheet 11x can be set within a predetermined range, and even when the roll 2 is compressed and stored in a cardboard box, the water absorption is maintained. Note that when the number of individual embosses is less than 20, the plies of the kitchen towel sheet 11x tend to peel off easily. When the number of individual embosses exceeds 1800, the kitchen towel sheet 11x is crushed and the water absorption tends to decrease. Also, the shape of the individual emboss can be used without particular limitation, such as circular, elliptical, rectangular, square, floral pattern, etc. Note that the unevenness derived from the paper machine does not reduce the water absorption even when it is crushed and put into a cardboard box by optimizing the size and number of the embosses.

[0034] Also, in the embossed pattern, the size is 1 mm 2 or more and 40 mm 2The depth of a single emboss with the following area is, for example, in the range of 0.10 mm or more and 0.80 mm or less, in the range of 0.25 mm or more and 0.67 mm or less, or in the range of 0.35 mm or more and 0.55 mm or less. If the depth of a single emboss 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 tactile sensation during use tends to be inferior. If it exceeds 0.80 mm, the kitchen towel sheet 11x tends to become bulky, the roll density decreases, and the cosmetic appearance of the packaging tends to deteriorate.

[0035] The area and depth of the emboss are measured using a microscope. As the microscope, the product name "One-shot 3D Measurement Macroscope VR-3100" manufactured by KEYENCE is used. As the image observation, measurement, and image analysis software of the microscope, the product name "VR-H1A" can be used. Also, the measurement conditions are measurement under the conditions of a magnification of 12 times and a field area of 24 mm × 18 mm. The measurement magnification and field area may be appropriately changed depending on the size of the emboss to be obtained.

[0036] Note that, as shown in Figure 3, for the area of the emboss, the length a of the longest part of the periphery fr of the emboss and the length b of the longest part in the direction perpendicular to the length a are measured, and a × b is obtained as the area. Figure 4 shows the height profile on the X-Y plane by the microscope, and the height of the sheet surface is represented by shading. The substantially elliptical part where the shading in Figure 4 is different from the periphery indicates individual embosses, and the length a of the longest part of one of the embosses can be visually distinguished. Among these, for emboss units with an area of 1 mm 2 or more and 40 mm 2 or less, the number per 100 cm 2 is counted.

[0037] The measurement of the number of embosses is visually measured by selecting an arbitrary 100 cm 2 part from the entire area between two adjacent perforations in the longitudinal direction across the entire width of the sheet. Note that if nailing (edge emboss) processing is performed, etc., per 100 cm 2If the part cannot be selected, measure the number of embossments for the measurable part excluding the part that cannot be measured by knurling (edge embossing) or the like, and convert it to the number of embossments per 100 cm 2 and use that as the number of embossments per 100 cm.

[0038] Next, measure the depth of the embossments for embossment units with an area of 1 mm 2 or more and 40 mm 2 or less. The depth of the embossment is obtained by measuring the height difference of the embossment using the above microscope. First, draw a line segment AB as shown in Fig. 4 to obtain the height profile shown in Fig. 5. Note that the line segment AB may be drawn so as to cross the embossment. The height profile is a (measured) cross-sectional curve S representing the unevenness of the actual sample surface of the sheet, but it also includes noise (sharp peaks caused by fiber lumps on the surface of the sheet, fibers growing in a whisker shape, or parts without fibers). When calculating the height difference of the unevenness, it is necessary to remove such noise peaks.

[0039] Then, as shown in Fig. 6, calculate the "contour curve" W from the cross-sectional curve S of the height profile, and find the average value of the bottoms P1 and P2 and the difference between the top part sandwiched between the bottoms P1 and P2 of this contour curve W, and use this as the depth D1 of the embossment. Similarly, find the average value of the bottoms P2 and P3 and the difference between the top part sandwiched between the bottoms P2 and P3, and use this as the depth D2 of the embossment. Similarly, measure D3. Note that D1, D2, and D3 are measured at continuous 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 used as the depth of the embossment. If the distance between the embossments (the distance between P1 and P2) is more than 1 cm apart, instead of measuring at continuous locations, find the average value of the bottoms P1 and P2 and the difference between the top part sandwiched between the bottoms P1 and P2, use this as the depth D1 of the embossment, measure D1 at 30 locations, and use the average value as the depth of the embossment.

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

[0041] When measuring the emboss, the measurement surface is the surface side. Also, when selecting the emboss, measure at a portion corresponding to 10% of the roll length of the kitchen towel roll 1 starting from the outer wound end of the kitchen towel roll 1 (the position where the use of the kitchen towel sheet 11x begins). For example, when the roll length is 30 m, measure at a portion 30 m × 10% = 3 m from the end. Note that if the 10% portion of the roll length hits the perforation, measure the outer wound side of the perforation.

[0042] The ply on the back surface 11b of the kitchen towel sheet 11x is not particularly limited with respect to whether or not an emboss pattern is applied, as long as it has an uneven pattern derived from a papermaking process different from the emboss pattern. Whether nested emboss or pin-to-pin emboss is applied, or whether no emboss is applied, is acceptable, but preferably nested emboss or no emboss, more preferably no emboss.

[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 or more and 40 μm or less, in the range of 20 μm or more and 35 μm, or in the range of 25 μm or more and 30 μm or less. When the thickness is less than 15 μm, scorch tends to occur during heat sealing, resulting in a decrease in cosmetic properties or the film being torn. Also, when the thickness exceeds 40 μm, the peelability 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-described physical properties, the kitchen towel sheet 11x of the present embodiment preferably has the following physical properties. (DMDT and DCDT) The dry machine direction tensile strength DMDT (Dry Machine Direction Tensile Strength) of the kitchen towel sheet 11x in the longitudinal direction based on JIS P 8113 is, from the viewpoint of wiping property and the like, for example, in the range of 5 N / 25 mm or more and 24 N / 25 mm or less, in the range of 8 N / 25 mm or more and 19 N / 25 mm or less, or in the range of 10 N / 25 mm or more and 16 N / 25 mm or less. Also, the dry cross direction tensile strength DCDT (Dry Cross Direction Tensile Strength) is, from the viewpoint of wiping property and the like, for example, in the range of 3 N / 25 mm or more and 19 N / 25 mm or less, in the range of 5 N / 25 mm or more and 14 N / 25 mm or less, or in the range of 6 N / 25 mm or more and 12 N / 25 mm or less. If DMDT is less than 5 N / 25 mm or DCDT is less than 3 N / 25 mm, the kitchen towel sheet 11x tends to be easily torn when absorbing water and the wiping property decreases. If DMDT exceeds 24 N / 25 mm or DCDT exceeds 19 N / 25 mm, the density of the kitchen towel sheet 11x increases, and the wiping property tends to decrease due to a decrease in water absorbency or the sheet becomes hard and the wiping property decreases.

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

[0046] (Specific volume of kitchen towel sheet) The specific volume of the 11x kitchen towel sheet is, from the viewpoint of the touch feeling during use etc., for example, in the range of 6 cm 3 / g or more and 16 cm 3 / g or less, 7 cm 3 / g or more and 15 cm 3 / g or less, or 9 cm 3 / g or more and 13 cm 3 / g or less. If the specific volume of the 11x kitchen towel sheet is less than 6 cm 3 / g, the water absorption amount and the touch feeling during use of the 11x kitchen towel sheet tend to decrease. If it exceeds 16 cm 3 / g, the 11x kitchen towel sheet becomes bulky, the touch feeling during use deteriorates, and the improvement of the water absorption amount also tends to be insufficient. Note that the specific volume is obtained by dividing the paper thickness per 11x kitchen towel sheet by the basis weight, and is the volume in cm per unit g 3It is the value represented by

[0047] (Primary peel strength) The primary peel strength of the kitchen towel sheet 11x is, for example, in the range of 0.05 N / 75 mm or more and 2.0 N / 75 mm or less, in the range of 0.10 N / 75 mm or more and 1.5 N / 100 mm or less, or in the range of 0.15 N / 75 mm or more and 1.0 N / 75 mm or less. If the primary peel strength is less than 0.05 N / 75 mm, the primaries will peel off and it will be difficult to wipe. If the primary peel strength exceeds 2.0 N / 75 mm, the water absorption of the kitchen towel sheet 1x will be inferior.

[0048] The method for measuring the primary peel strength shall be carried out under the standard conditions specified in JIS P 8111 using a tensile testing machine (STB-1225S, manufactured by A&D Company, Limited) in accordance with the tensile test method of JIS P 8113. First, a test piece with a width of 75 mm in the width direction and 200 mm in the flow direction is taken from a sample of the kitchen towel sheet 11x. Next, the primary is peeled 35 mm in the flow direction. One side of the peeled primary is fixed by sandwiching it with the upper gripper (width 75 mm) for 15 mm in the flow direction. Also, the other primary is fixed by sandwiching it with the lower gripper (width 75 mm) for 15 mm in the flow direction. The pitch (interval) of the grippers shall be 20 mm. Next, it is pulled (peeled) under the condition of a tensile speed of 100 mm / min, and strength data is collected. The strength data is acquired every 20 μm, and the data from 40 mm to 150 mm (measurement length 110 mm) after the start of measurement is averaged, and this is taken as the peel strength (N / 75 mm). However, if there are perforations from 40 mm to 150 mm after the start of measurement, the distance after the start of measurement can be shortened to a range without perforations, for example, from 40 mm to 90 mm (measurement length 50 mm).

[0049] (Manufacturing method of kitchen towel sheet and kitchen towel roll) The kitchen towel sheet 11x and the kitchen towel roll 2 can be manufactured, for example, in the order of (1) papermaking and creping, (2) embossing, and (3) roll winding. In the manufacturing process, it is preferable not to use through-air dryer technology. Hereinafter, each process will be described.

[0050] In the papermaking process, uneven patterns derived from the papermaking process different from the above-mentioned embossing pattern are applied to the kitchen towel sheet 11x. By having this uneven pattern, the water absorption of the kitchen towel sheet 11x becomes even higher. Note that being derived from the papermaking process means being applied between the headbox of the paper machine and the inlet 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, unevenness can be imparted at the belt press section 30 disposed between the dehydration roll 31 and the Yankee dryer 32. At the belt press section 30, by pressing the wet paper 34 and the uneven belt 33 (the uneven belt 33 loops around the belt press section 30 and the Yankee dryer 32) together, an uneven pattern can be imparted to the wet paper.

[0051] Also, the uneven pattern can be appropriately changed by changing the pattern of the belt (fine pattern, rough pattern). When the uneven pattern is changed, the specific volume (paper thickness) changes, but it is preferable to select a pattern such that the specific volume (paper thickness) of the base paper falls within the numerical range described later.

[0052] At this time, the basis weight of 2-ply of the base paper used for manufacturing the kitchen towel sheet 11x is, for example, 33 g / m 2 or more and 68 g / m 2 or less, 39 g / m 2 or more and 63 g / m 2 or less, or 47 g / m 2 or more and 55 g / m 2 or less. Also, 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. Further, the specific volume is 6 cm3 16 cm or more per g 3 7 cm within the range of per g or less 3 15 cm or more per g 3 9 cm within the range of per g or less 3 13 cm or more per g 3 It is within the range of per g or less. Also, the thickness of the kitchen towel sheet 11x is preferably higher than the paper thickness of the base paper in order to improve water absorption, and the specific volume of the kitchen towel sheet 11x is preferably higher than the specific volume of the base paper in order to improve water absorption.

[0053] One or more of the thus obtained kitchen towel rolls 2 are arranged with their longitudinal directions aligned and are arranged in parallel in the width direction, and are caramel-wrapped by a packaging film 20 according to a known method, for example, as shown in FIG. 1.

[0054] The present invention is not limited to the above-described embodiments, and it goes without saying that the present invention extends to various modifications and equivalents included in the spirit and scope of the present invention.

Examples

[0055] (1) Papermaking and creping, (2) Embossing, (3) Roll winding process, (4) Through the process of caramel packaging, kitchen towel roll products of Examples 1 to 21 and Comparative Examples 1 to 10 were manufactured. For all of the above examples and the kitchen towel roll products of the comparative examples, each parameter was measured and a sensory evaluation was performed. 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 an uneven pattern derived from a paper machine.

[0056] The sensory evaluation was conducted in such a way that 20 monitors selected "good" or "bad" for each evaluation item. The evaluation criteria are as follows. ◎, ○, and △ were regarded as passing. ◎: When 18 or more and 20 or less people said "good" ○: When 14 or more and 17 or less people said "good" △: When 10 or more and 13 or less people said "good" ×: When 6 or more and 9 or less people said "good" ××: When there is no "good" and the number is between 1 and 5 people

[0057] Each evaluation item will be described. <Water absorption per sheet (indicated as "Water absorption per sheet" in each table)> When the monitor used one sheet, the remaining water after wiping was evaluated. <Whether the sheet can be used without waste (indicated as "Efficiency" in each table)> When the monitor used one sheet and discarded it, it was evaluated whether it felt a pity. <Holder suitability> The ease of use when putting the kitchen towel roll into the holder was evaluated. <Transport efficiency> The size of the gap when the kitchen towel roll was stored in a cardboard box was evaluated. <Wiping property> When the monitor used it, the ease of the wiping operation was evaluated. The results are shown in Tables 1 to 3.

[0058]

Table 1

[0059]

Table 2

[0060]

Table 3

[0061] From the above, according to the present invention, by adjusting the basis weight, water absorption, winding softness, etc. of the kitchen towel sheet within a predetermined range, it is possible to improve the transport efficiency while maintaining high levels of water absorbency and holder suitability of the kitchen towel sheet.

Explanation of symbols

[0062] 1 Kitchen towel roll product 2 Kitchen towel roll 10 Core 20 Packaging film 11a Surface 11b Back surface 11x Kitchen towel sheet 30 Belt press section 31 Dehydration roll 32 Yankee dryer 33 Embossed belt 34 Wet paper 40 Roll softness measuring device 41 Base section 42a, 42b Support rod 43 Moving weight mounting plate 44 Weight 200 Test piece 200a, 200d Corner 210 Band 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 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 The number of pieces per unit is between 20 and 1,800, The basis weight of the two plies of the kitchen towel is 32 g / m ２ 65g / m or more ２ is as follows: The roll density of the kitchen towel roll is 0.04 g / cm ３ 0.15g / cm or more ３ is as follows: A kitchen towel roll product, wherein the ply peel strength of the kitchen towel is 0.05 N / 75 mm or more and 2.0 N / 75 mm or less.

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

3. 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 area of ​​the kitchen towel surrounded by two adjacent perforations in the longitudinal direction is 0.02 m ２ 0.10m or more ２ 3. The kitchen towel roll product of claim 1 or 2, wherein:

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