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 Art

[0002] From the viewpoints of the soaring logistics costs due to the shortage of truck drivers and the increase in CO2 emissions, etc., the improvement of logistics efficiency has become important. Generally, when roll-type products such as kitchen towel rolls and toilet paper rolls are transported in cardboard boxes that are close to a cube, spaces are generated at the four corners, resulting in losses. Recently, pallet transportation is becoming the mainstream instead of loose loading onto trucks, and even a difference of just a few centimeters in the cardboard box can greatly affect the loading efficiency.

[0003] Therefore, in order to improve the transportation efficiency of toilet paper roll products, products with a longer roll length, more compact products than before, and products that are transported with the core crushed have been proposed. However, the compact products have problems such as a narrow paper width and poor usability. Also, when the core is crushed, there is a problem that it becomes difficult to attach it to the holder. In the case of kitchen towel rolls, there are also long-sized products, but it is difficult to achieve both 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 product being deformed 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 protrusions, the winding density of the roll, and the ratio of the minimum embossed area to the maximum embossed area are adjusted to a predetermined range. However, the purpose of Patent Document 1 is to maintain the absorbency of the kitchen towel roll even when the winding length is increased. Furthermore, the kitchen towel roll of Patent Document 1 is not resistant to crushing in the thickness direction and is not soft (paragraph 0011). It is not clear from prior art such as Patent Document 1 that adjusting predetermined characteristics of a kitchen towel roll to a predetermined range can improve transportation efficiency while suppressing the decrease in absorbency due to compression of the kitchen towel roll. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2019-208854 (Claim 1, paragraph 0011) [Overview of the project] [Problems that the invention aims to solve]

[0006] In the course of research to improve the transport efficiency of kitchen towel rolls, the inventors investigated the softness and diameter of kitchen towel rolls and obtained the following findings: When nearly cylindrical kitchen towel rolls are stored in rectangular or cubic cardboard boxes, the gaps between the kitchen towel rolls become large, reducing transport efficiency. On the other hand, if the kitchen towel rolls are soft and easily deformable, the number of kitchen towel rolls that can be stored in a cardboard box increases, or a smaller cardboard box can be used to store the same number. However, if the kitchen towel rolls deform too much, they remain deformed even after being removed from the cardboard box, making them very difficult to use when placed in a holder, and potentially reducing the water absorption of the kitchen towel rolls. On the other hand, if the diameter or length of the kitchen towel roll is small, the proportion of the core's outer diameter to the outer diameter of the kitchen towel roll becomes large, resulting in poor transport efficiency. Based on these findings, the inventors conducted further research.

[0007] The objective of the present invention is to provide a kitchen towel roll product that maintains its water absorption capacity and is suitable for use as a holder, even when compressed to improve transport efficiency. [Means for solving the problem]

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

[0009] (1) A kitchen towel roll product comprising a kitchen towel roll formed by winding a sheet of kitchen towels, which are 2-ply laminated, into a roll, and a packaging film for packaging the kitchen towel roll, wherein the kitchen towels have an uneven pattern derived from the paper machine, which is applied between the headbox of the paper machine and the inlet of the Yankee dryer, and the basis weight of the 2-ply is 32 g / m². 2 More than 65g / m 2 The following is the water absorption capacity: 155 g / m²2 520 g / m² or less 2 A kitchen towel roll product, with a basis weight of 520 g / m² or less and a winding softness of the kitchen towel roll being 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 concavo-convex pattern, together with the concavo-convex pattern derived from the paper machine. The embossing pattern includes a plurality of embossing units, and the area of each embossing unit is 1 mm² or more and 40 mm² 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. 2 or more 2 or less. The kitchen towel roll product according to any one of (1) to (3) above. (4) The kitchen towel roll product according to (4) above, wherein the number of the embossing units per 100 cm² of the unit area of the embossing pattern is 20 or more and 1800 or less. 2 The kitchen towel roll product according to (4) above, wherein the number of the embossing units per 100 cm² of the unit area of the embossing pattern is 20 or more and 1800 or less. (5) The kitchen towel roll further has a plurality of perforations provided 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 m² or more and 0.10 m² or less. The kitchen towel roll product according to any one of (1) to (4) above. 2 or more 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 enhance transportation efficiency and has holder suitability.

Brief Description of the Drawings

[0011] [Figure 1] It is a perspective view schematically showing the external configuration of a kitchen towel roll product which is a first embodiment of the present invention. [Figure 2]Figure 1 is a schematic perspective view showing the appearance of the roll included in the kitchen towel roll product of the first embodiment. [Figure 3] This figure shows how to determine the embossed area of ​​a kitchen towel in the kitchen towel roll product of the first embodiment shown in Figure 1. [Figure 4] This diagram shows the height profile on the XY plane as measured by a microscope, using varying shades of gray. [Figure 5] This graph shows the height profile on the XY plane as measured by a microscope. [Figure 6] This diagram shows how to determine the depth of an embossed area between 1 mm² and 40 mm². [Figure 7] This figure shows a method for measuring the water absorption capacity of a kitchen towel in the kitchen towel roll product of the first embodiment shown in Figure 1. [Figure 8] This figure shows a part of the papermaking process for kitchen towels included in the kitchen towel roll product of the first embodiment shown in Figure 1. [Figure 9] This is a schematic side view showing the configuration of a device for measuring the winding softness of kitchen towel rolls. [Modes for carrying out the invention]

[0012] The kitchen towel roll product 1 of this embodiment will be described in detail below with reference to the drawings. Figure 1 shows the appearance of the kitchen towel roll product 1 according to the first embodiment. Figure 2 shows the appearance of the kitchen towel roll 2. Figure 3 shows how to determine the embossed area of ​​the kitchen towel. Figure 4 is the height profile on the XY plane obtained by a microscope. Figure 5 is a graph showing the height profile on the XY plane obtained by a microscope. Figure 6 shows an area of ​​1 mm 2 40mm or more 2 The following shows how to determine the depth of the embossing units. Figure 7 shows the method for measuring the water absorption of kitchen towel 11x. Figure 8 shows a part of the papermaking process for kitchen towel 11x. Figure 9 is a schematic side view of the device 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 laminated kitchen towel 11x (hereinafter also referred to as "kitchen towel sheet 11x") which has an uneven pattern derived from a paper machine and has a basis weight and water absorption within a predetermined range. A kitchen towel roll 2 (hereinafter also referred to as "roll 2") is wound onto a core 10 such as a paper tube or plastic tube, and two of these rolls (hereinafter also referred to as "roll 2") are placed side by side in the longitudinal direction and wrapped with a packaging film 20 to form a caramel-like package.

[0014] Here, the uneven pattern originating from the paper machine refers to the uneven pattern automatically applied between the headbox of the paper machine and the entrance to the Yankee dryer. Our research has shown that when this uneven pattern originating from the paper machine is combined with the predetermined basis weight, water absorption, and winding flexibility of roll 2 as defined in this embodiment, the roll is less susceptible to crushing even when subjected to external pressure. Examples of external pressure include the compressive force applied when storing roll 2 in a cardboard box.

[0015] The kitchen towel roll product 1 of this embodiment is packaged with two kitchen towel rolls 2, but the number of packages is not particularly limited and can be any number, for example, in the range of 1 to 4, 1 to 2, or 1. In the case of multiple packages, from the viewpoint of the aesthetic appearance of the packaging, 2 or 3 are preferred. By caramelizing the kitchen towel rolls 2, sealing defects and scorching (holes due to burning) are less likely to occur, and the aesthetic appearance of the packaging is significantly improved. In addition, because it is caramelized, it also has excellent strength and ease of opening. The kitchen towel rolls 2 of this embodiment are caramelized, but are not limited to this, and can be gusseted, pillow-wrapped, shrink-wrapped, two-sided sealed, etc.

[0016] There are no particular restrictions on the outer diameter D1 of the core 10 of roll 2, but from the viewpoint of making it easy to adjust the winding density of roll 2 and handling roll 2 during manufacturing, for example, it is in the range of 35 mm to 45 mm or 37 mm to 42 mm. Hereinafter, of the surface of the kitchen towel sheet 11x, the surface facing outwards from roll 2 is referred to as the roll surface 11a, and the surface that is in contact with or facing the core 10 of roll 2 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 ply peeling. The adhesive layer may be provided over the entire area between the plies or only in part. As the adhesive, any known adhesive that does not affect the water absorption or texture of the kitchen towel sheet can be used without particular limitation, for example, glue. The kitchen towel sheet 11x may have colored and / or black patterns or letters printed on it.

[0018] (Basis weight of kitchen towel sheets) In this embodiment, the basis weight of the kitchen towel sheet 11x is, from the viewpoint of water absorption and softness, for example, 32 g / m² for the 2-ply version. 2 More than 65g / m 2 Within the following range, 39g / m² 2 More than 63g / m 2 The following ranges, or 47g / m² 2 More than 55g / m 2 The following range applies: Basis weight 32g / m² 2 If the basis weight is less than 32 g / m², the tactile feel of the kitchen towel sheet 11x during use will be reduced. 2 Below a certain basis weight, the absorbency of the 11x kitchen towel sheet tends to decrease. 2 Beyond a certain point, the kitchen towel sheet 11x becomes stiff and no longer conforms to the shape of the object, resulting in a decrease in wiping performance. Basis weight is measured according to JIS P 8124.

[0019] (Absorption capacity of kitchen towel sheets) In this embodiment, the water absorption capacity of the kitchen towel sheet 11x is, for example, 155 g / m². 2 More than 520g / m 2 Within the following range, 180g / m² 2 More than 400g / m 2 The following range or 200g / m 2 More than 260g / m 2 The range is as follows: Here, "g / m 2 In the unit, "g" indicates the weight of absorbed water, and "m" indicates the weight of absorbed water. 2 " indicates the area of ​​a water-absorbing kitchen towel sheet 11x. When the kitchen towel sheet 11x is made into a size that is easy to handle, the water absorption capacity is 155g / m². 2 Below this level, one sheet tends not to be able to adequately wipe away the water. (Water absorption capacity: 520g / m²) 2 If the amount exceeds a certain limit, the sheet may not be able to be used effectively, and it tends to have to be discarded even though it still has the capacity to absorb water.

[0020] The water absorption per gram of one ply of the kitchen towel sheet 11x is, for example, in the range of 2.5g to 5.0g, 2.6g to 4.9g, or 2.7g to 4.0g. If it is within the above range, the water absorption of the kitchen towel sheet 11x is (g / m²). 2 ) is easy to adjust to an appropriate range.

[0021] The water absorption amount is measured, for example, as follows: First, a 2-ply stacked kitchen towel sheet 11x is taken and cut using a 7.6 cm (3 inch) square template to create a rectangular test specimen with sides of 7.6 cm. The mass of the test specimen before water absorption is measured using an electronic balance. The test specimen is then set in the holder shown in Figure 7 (a jig that fixes the test specimen at three points, and the jig is made of a metal that does not absorb moisture).

[0022] Distilled water is poured to a depth of 2 cm into a commercially available tray, and the test specimen set in the holder 220 is immersed in the distilled water for 2 minutes. After 2 minutes of immersion, the test specimen and holder are removed from the distilled water, and a strip 210 is attached to one corner 200d of the test specimen 200, as shown in Figure 7. The strip 210 is made from the same kitchen towel sheet 11x as the sample to be measured, cut to a size of 2 mm wide x 15 mm long, and attached to the part of the test specimen 6 mm from corner 200d toward the center. Next, the holder and test specimen 200 are suspended from a rod placed in an empty water tank with the corner 200a opposite corner 200d facing upwards, and the lid of the water tank is closed and left for 10 minutes. After that, the holder 220 and test specimen 200 are removed from the water tank, the strip 210 and holder 220 are removed, and the mass of the test specimen 200 is measured using an electronic balance. From the change in mass of the test specimen 200 before and after immersion in distilled water, the mass of the test specimen 1 m 2 Water absorption capacity of distilled water per unit area (water g / m² of paper) 2 ) calculate. Furthermore, 1m 2 Water absorption per unit area (g water / m² of paper) 2 By dividing ) by the basis weight of the 2-ply test specimen, 1 m 2 Water absorption per unit area (g water / m² of paper) 2 ) / Basic weight (paper g / paper m 2 The amount of water absorbed per gram (g water / g paper) is calculated. Measurements are taken 5 times for each sample, and the average value is used. This measurement is performed according to the JIS P 8111 method, at a temperature of 23±1℃ and a humidity of 50±2%. Distilled water is also maintained at 23±1℃.

[0023] (Area of ​​kitchen towel sheet) The area per sheet of a 11x kitchen towel sheet is, for example, 0.02 m². 2 More than 0.10m 2 Within the following range, 0.03m 2 0.08m 2 Within the following range or 0.04m 2 The above is 0.06m 2The area is as follows. This area should not be set in isolation, but rather in conjunction with the characteristics of the kitchen towel sheet 11x, particularly its basis weight and water absorption capacity. The kitchen towel roll 2 may have multiple perforations spaced at predetermined intervals along its length. These perforations extend along the width of the kitchen towel sheet 11x, cutting the sheet in the width direction. Here, the area enclosed by two adjacent perforations along the length is defined as the area of ​​one kitchen towel sheet 11x.

[0024] Each 11x kitchen towel sheet has an area of ​​0.02m². 2 Below 0.10m, workability and water absorption decrease, wiping performance deteriorates, making it difficult to wipe objects or for a single sheet to be sufficient. 2 If the amount of absorbent material exceeds a certain limit, it becomes difficult to use the sheets effectively, and sheet waste tends to occur. More specifically, it would be ideal if one sheet could wipe one plate, for example, but if the absorbent material is high, for example, 0.8 sheets can wipe one plate, in which case 0.2 sheets are wasted. If the area of ​​a single sheet is reduced, the workability and absorbency decrease, and the water wiping becomes insufficient. In this embodiment, by setting the optimal absorbency, etc., for a sheet area that is easy to work with, a highly convenient kitchen towel sheet 11x can be made.

[0025] (Softness of the roll of kitchen towels) The softness of the Kitchen Towel Roll 2 should be within the following ranges from the perspective of transportation efficiency: for example, between 2mm and 12mm, between 3mm and 10mm, or between 4mm and 8mm. If the softness is less than 2mm, the Kitchen Towel Roll 2 becomes stiff and difficult to deform, which tends to create gaps in the corners and between the rolls when stored in a cardboard box, reducing transportation efficiency. If the softness exceeds 10mm, the Kitchen Towel Roll 2 becomes too soft and tends to remain deformed even after being removed from the cardboard box, making it difficult to use with a holder.

[0026] The winding softness is as of this embodiment. kitchen When a load of 625g is applied to towel roll 2 kitchen This can be defined as the amount of deformation of the towel roll 2. More specifically, the winding softness is measured using the measuring device 40 shown in Figure 9. The measuring device 40 comprises a base portion 41, support rods 42a and 42b, a movable weight plate 43, and a 625g weight 44. The two support rods 42a and 42b rise vertically from the base portion 41, and insertion holes for each support rod 42a and 42b are provided at both ends of the rectangular movable weight plate 43. And on the base portion 41, between each support rod 42a and 42b kitchen Towel roll 2 Place it on top, kitchen Towel roll 2 From above, the support rods 42a and 42b are inserted through the movable weight plate 43, and the movable weight plate 43 kitchen Towel roll 2 It is placed on the top surface. The height of the movable weight plate 43 in this state is taken as the initial height h1. When the weight 44 is placed on the movable weight plate 43, the weight of the weight 44 causes the movable weight plate 43 to slide through the support rods 42a and 42b, kitchen Towel roll 2 It deforms and sinks, so measure the height h2 at this time and (h2-h1) kitchen Towel roll 2 This is calculated as the amount of deformation in the diameter. Next, kitchen Towel roll 2 Rotate the object 120 degrees and calculate the winding softness using the same procedure. Rotate it another 120 degrees and perform the same procedure. The average of the three measurements is used as the measurement value.

[0027] (Diameter of kitchen towel roll) The diameter of each roll of kitchen towel roll 2 is, for example, in the range of 113mm to 200mm, 135mm to 180mm, or 140mm to 160mm. When the diameter is less than 113mm, it tends to be difficult to adjust the roll density and the water absorption capacity of the kitchen towel sheet 11x to a good balance within a suitable range. Also, the proportion of the outer diameter of the core 10 in kitchen towel roll 2 becomes larger, which tends to reduce transport efficiency. When the diameter exceeds 200mm, it tends to be difficult to use with holders. Also, the roll density and, consequently, the aesthetic appeal of the packaging tend to decrease.

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

[0029] (Roll density of kitchen towel rolls) In this embodiment, in a kitchen towel roll 2 formed by winding kitchen towel sheets 11x into a roll shape, the roll density is 0.04 g / cm³.3 More than 0.15g / cm 3 Within the following range, 0.05 g / cm³ 3 More than 0.13g / cm 3 The following range or 0.06 g / cm³ 3 More than 0.11g / cm 3 The range is as follows. Instead of setting the roll density independently, it is necessary to set the roll density according to the basis weight and water absorption of the 11x kitchen towel sheet. Roll density of 0.04 g / cm² 3 If the roll density is less than 0.15 g / cm², the top and / or bottom surfaces may not be folded neatly when wrapping the caramel, resulting in unadhesive areas or scorching, which can impair the aesthetic appearance. 3 If the roll diameter exceeds a certain limit, the kitchen towel sheet may become compressed, reducing its water absorption capacity, especially if the roll diameter remains constant.

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

[0031] (Embossed pattern on kitchen towel sheets) The kitchen towel sheet 11x may have an embossed pattern in addition to the uneven pattern derived from the paper machine. Such an embossed pattern can be easily formed, for example, by embossing. Alternatively, the kitchen towel sheet 11x of this embodiment may be made by embossing a single-ply sheet and then laminating two plies. When laminating two plies, it is preferable to use ply bond glue and apply the glue for bonding. By bonding the two plies in this way, the adhesion between the plies becomes stronger, and the kitchen towel sheet 11x becomes less likely to tear even when wet, as the plies will not peel off.

[0032] Preferably, the plies of the surface 11a of the kitchen towel sheet 11x are coated with a dot-shaped embossed pattern. By applying a dot-shaped embossed pattern to the surface 11a, glue can be applied to the embossed parts of the embossed pattern for adhesion treatment, which makes it less likely for the plies of the kitchen towel sheet 11x to peel off and suppresses large fluctuations in water absorption.

[0033] In the embossed pattern, the size is 1 mm 2 40mm or more 2 An embossed pattern with the following area is considered a single embossed pattern: 100 cm² per unit area. 2The number of individual embossed patterns is not particularly limited, but for example, it can be 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 patterns affect the water absorption of the kitchen towel sheet 11x and the softness of the roll 2. Therefore, by appropriately selecting the area and number of embossed patterns, the water absorption of the kitchen towel sheet 11x can be kept within a predetermined range, and the water absorption is maintained even when the roll 2 is compressed and stored in a cardboard box. Note that if the number of individual embossed patterns is less than 20, the plies of the kitchen towel sheet 11x tend to peel apart easily. If the number of individual embossed patterns exceeds 1800, the kitchen towel sheet 11x tends to be crushed, and the water absorption tends to decrease. In addition, the shape of the individual embossed patterns can be circular, oval, rectangular, square, floral, etc., without any particular limitations. Furthermore, the unevenness originating from the paper machine does not reduce water absorption even when the paper is flattened and placed in a cardboard box, as the size and number of embossing patterns are optimized.

[0034] Also, in the embossed pattern, the size is 1 mm 2 40mm or more 2 The depth of the embossed area 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 feel during use tends to be inferior. If it exceeds 0.80 mm, the kitchen towel sheet 11x tends to become bulkier, the roll density decreases, and the aesthetic appeal of the packaging tends to decrease.

[0035] The area and depth of the embossing are measured using a microscope. The microscope used is the "One-Shot 3D Measurement Macroscope VR-3100" manufactured by KEYENCE. For observing, measuring, and analyzing the microscope images, the software "VR-H1A" can be used. The measurement conditions are 12x magnification and a field of view of 24mm x 18mm. The magnification and field of view may be adjusted as needed depending on the desired size of the embossing.

[0036] The area of ​​the emboss is calculated by measuring the length a of the longest part of the emboss's periphery fr and the length b of the longest part perpendicular to length a, as shown in Figure 3, and then multiplying a by b to determine the area. Figure 4 shows the height profile on the XY plane obtained with a microscope, where the height of the sheet surface is represented by the shades of gray. The roughly elliptical areas in Figure 4 with different shades from the surrounding areas represent individual embossments, and the length a of the longest part of one of these embossments can be visually identified. Of these, the area is 1 mm². 2 40mm or more 2 For the following embossing units, 100cm 2 Count the number of items per unit.

[0037] The number of embossing marks is measured across the entire width of the sheet, from any 100cm area between two adjacent perforations along the length. 2 Select the area and measure it visually. Note that if knurling (edge ​​embossing) has been performed, etc., 100cm 2 If you cannot select a specific area, measure the number of embossed areas in the measurable areas, excluding areas that cannot be measured due to knurling (edge ​​embossing), etc., and measure 100cm². 2 Convert this to the number of embossed marks per unit.

[0038] Next, the area is 1 mm 2 40mm or more 2The embossing depth is measured for the following embossing units. The embossing depth is determined by measuring the height difference of the embossing as described above using the microscope. First, draw line segment AB as shown in Figure 4 to obtain the height profile in Figure 5. Note that line segment AB should be drawn so as to cross the embossing. The height profile is the (measured) cross-sectional curve S that represents the unevenness of the actual sheet sample surface, but it also contains noise (steep peaks caused by fiber clumps on the sheet surface, fibers extending in a whisker-like manner, or 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 Figure 6, the "profile curve" W is calculated from the cross-sectional curve S of the height profile. The difference between the average value of the bottoms P1 and P2 and the top point between the bottoms P1 and P2 is determined and defined as the embossing depth D1. Similarly, the difference between the average value of the bottoms P2 and P3 and the top point between the bottoms P2 and P3 is determined and defined as the embossing depth D2. D3 is measured in the same manner. Note that D1, D2, and D3 are measured at consecutive points as shown in Figure 6. These measurements are taken at 10 locations on the kitchen towel sheet 11x, and the average value of the data from a total of 30 locations is defined as the embossing depth. Note that if the distance between embossings (distance between P1 and P2) is 1 cm or more, measurements may not be taken at consecutive points, but the difference between the average value of the bottoms P1 and P2 and the top point between the bottoms P1 and P2 is determined and defined as the embossing depth D1. D1 is measured at 30 locations and the average value is defined as the embossing 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 components and waviness components" as described in JIS B 0601 "3.1.1.2") from the cross-sectional curve using a low-pass filter. If λc is set to be greater than the distance between adjacent embossing points P1 and P2, or P2 and P3 (this is called the embossing pitch), the peak may be recognized as noise, so λc should be set to less than the embossing pitch. For example, if the embossing pitch is 800μm or less, set λc to 250μm.

[0041] When measuring the embossing, the measurement surface should be the front side. When selecting the embossing, measure at a point 10% of the roll length of the kitchen towel roll 1, starting from the end of the outer winding of the kitchen towel roll 1 (where you begin using the kitchen towel sheet 11x). For example, if the roll length is 30m, measure at a point 30m × 10% = 3m from the end. If the 10% mark of the roll length coincides with a perforation, measure on the outer winding side of the perforation.

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

[0043] (Packaging film) As the packaging film 20, for example, a heat-sealable resin film 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 tends to occur during heat sealing, reducing the aesthetic appearance or causing the film to tear. Also, 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 polyethylene film is preferred, for example. The thickness of the film is measured according to JIS Z1702.

[0044] In addition to the physical properties described above, 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 11x kitchen towel sheet, based on JIS P 8113, is, from the viewpoint of wiping ability, for example, in the range of 5N / 25mm to 24N / 25mm, 8N / 25mm to 19N / 25mm, or 10N / 25mm to 16N / 25mm. The dry cross direction tensile strength (DCDT), from the viewpoint of wiping ability, is, for example, in the range of 3N / 25mm to 19N / 25mm, 5N / 25mm to 14N / 25mm, or 6N / 25mm to 12N / 25mm. If the DMDT is less than 5N / 25mm or the DCDT is less than 3N / 25mm, the kitchen towel sheet 11x tends to tear easily when absorbing water, resulting in reduced wiping performance. If the DMDT exceeds 24N / 25mm or the DCDT exceeds 19N / 25mm, the density of the kitchen towel sheet 11x increases, leading to reduced water absorption and consequently reduced wiping performance, or the sheet becoming hard and thus reducing wiping performance.

[0045] (WMDT and WCDT) The wet machine direction tensile strength (WMDT) of the 11x kitchen towel sheet, based on the old JIS S 3104 standard, is, from the viewpoint of wiping ability, 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. Furthermore, the wet cross direction tensile strength (WCDT), from the viewpoint of wiping ability, 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. If the WMDT is less than 1.3N / 25mm or the WCDT is less than 0.7N / 25mm, the kitchen towel sheet 1x tends to tear easily when absorbing water, resulting in reduced wiping performance. If the WMDT exceeds 7.0N / 25mm or the WCDT exceeds 5.5N / 25mm, the density of the kitchen towel sheet 11x increases, leading to reduced water absorption and consequently reduced wiping performance, or it may become stiff and its wiping performance may decrease.

[0046] (Specific volume of kitchen towel sheets) The specific volume of a kitchen towel sheet 11x is, from the perspective of tactile feel during use, for example, 6 cm². 3 / g or more 16cm 3 Range of less than / g, 7cm 3 / g or more 15cm 3 / g or less or 9cm 3 / g or more 13cm 3 The range is less than or equal to / g. The specific volume of a kitchen towel sheet 11x is 6cm³. 3 If the value is less than / g, the absorbency and feel of the kitchen towel sheet 11x tend to decrease, 16cm 3 When the amount exceeds / g, the kitchen towel sheet 11x becomes bulky, reducing its feel during use, and the improvement in water absorption also tends to become insufficient. Note that the specific volume is calculated by dividing the paper thickness per kitchen towel sheet 11x by the basis weight, and is the volume per gram (cm³). 3This is the value represented by [the formula / symbol].

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

[0048] The ply peel strength measurement method is carried out in accordance with the tensile test method of JIS P 8113, using a tensile testing machine (STB-1225S, manufactured by A&D Co., Ltd.) under the standard conditions specified in JIS P 8111. First, a test piece measuring 75 mm in width and 200 mm in flow direction is taken from a sample of kitchen towel sheet 11x. Next, a 35 mm ply is peeled in the flow direction. One side of the peeled ply is fixed by clamping it 15 mm in the flow direction with an upper grip (width 75 mm). The other side of the ply is also fixed by clamping it 15 mm in the flow direction with a lower grip (width 75 mm). The grip pitch (spacing) is 20 mm. Next, the material is pulled (peeled) at a tensile speed of 100 mm / min, and strength data is collected. Strength data is acquired at 20 μm intervals, and the average of the data from a distance of 40 mm to 150 mm (measurement length 110 mm) after the start of measurement is taken as the peel strength (N / 75 mm). However, if the distance from 40 mm to 150 mm after the start of measurement includes a perforation, the distance after the start of measurement can be shortened to a range that does not include the perforation, for example, from 40 mm to 90 mm (measurement length 50 mm).

[0049] (Method for manufacturing kitchen towel sheets and kitchen towel rolls) Kitchen towel sheets 11x and kitchen towel rolls 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 process will be described below.

[0050] In the papermaking process, a pattern of unevenness originating from the papermaking process, different from the embossing pattern described above, is applied to the kitchen towel sheet 11x. This unevenness pattern further increases the water absorption capacity of the kitchen towel sheet 11x. "Originating from the papermaking process" means that the unevenness is applied to the kitchen towel sheet 1x between the headbox of the papermaking machine and the inlet of the Yankee dryer. Specifically, in a part of the papermaking process shown in Figure 8, the unevenness can be applied by a belt press section 30 located between the dewatering roll 31 and the Yankee dryer 32. In the belt press section 30, the wet paper 34 and the unevenness belt 33 (the unevenness belt 33 loops between the belt press section 30 and the Yankee dryer 32) are pressed together to apply the unevenness pattern to the wet paper.

[0051] Furthermore, the pattern of the unevenness can be changed as needed by changing the belt pattern (fine pattern, coarse pattern). Changing the pattern of the unevenness will change the specific volume (paper thickness), 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] In this case, the basis weight of the 2-ply base paper used in the manufacture of the kitchen towel sheet 11x is, for example, 33 g / m². 2 More than 68g / m 2 Within the following range, 39g / m² 2 More than 63g / m 2 The following range or 47g / m² 2 More than 55g / m 2 The following ranges apply. Furthermore, the paper thickness is within the range of 1.3mm / 10 sheets to 4.5mm / 10 sheets, 1.7mm / 10 sheets to 3.5mm / 10 sheets, or 2.0mm / 10 sheets to 3.0mm / 10 sheets. Additionally, the specific volume is 6cm³.3 16 cm or more per g 3 in the range of 7 cm or less per g 3 15 cm or more per g 3 in the range of 9 cm or less per g or 3 13 cm or more per g 3 it is in the range of less than per g. Further, 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并列 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 is needless to say 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, and (4) Caramel packaging processes were carried out to produce kitchen towel roll products of Examples 1 to 21 and Comparative Examples 1 to 10. All of the above Examples and Comparative Example kitchen towel roll products were measured for each parameter and subjected to sensory evaluation. 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 the paper machine.

[0056] The sensory evaluation was conducted by a method in which 20 monitors selected "good" or "bad" for each evaluation item. The evaluation criteria were as follows. ◎, ○, and △ were considered 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 are no "good" people, or when there are between 1 and 5 people.

[0057] We will now explain each evaluation item. <Water absorption per sheet (indicated as "Water absorption / sheet" in each table)> The monitor evaluated the amount of water remaining after using one sheet. <Can the sheets be used efficiently? (This is indicated as "Efficiency" in each table.)> We evaluated whether the monitors felt it was wasteful to use and discard one sheet. <Suitability as a holder> We evaluated the ease of use when placing the kitchen towel roll into the holder. <Transportation efficiency> We evaluated the amount of space left when kitchen towel rolls were stored in a cardboard box. <Wipeability> The ease of wiping the product during use was evaluated. The results are shown in Tables 1-3.

[0058] [Table 1]

[0059] [Table 2]

[0060] [Table 3]

[0061] Based on the above, according to the present invention, by adjusting the basis weight of the kitchen towel sheet, the water absorption capacity, the winding flexibility of the kitchen sheet roll, etc., to a predetermined range, it is possible to improve transportation efficiency while maintaining a high level of water absorption and holder suitability of the kitchen towel sheet. [Explanation of Symbols]

[0062] 1. Kitchen towel roll product 2 Kitchen towel rolls 10 cores 20 Packaging film 11a surface 11b Back side 11x Kitchen Towel Sheets 30 Belt press section 31 Dehydration Roll 32 Yankee Hair Dryer 33. Uneven belt 34 Wet paper 40-wound softness measuring device 41 Base section 42a,42b Support rod 43. Movable weight plate 44 Weight 200 test specimens 200a, 200d corner 210 band 220 holder

Claims

1. A kitchen towel roll product comprising a kitchen towel roll formed by winding a sheet-like kitchen towel, which is a two-ply laminate, into a roll shape, and a packaging film for packaging the kitchen towel roll, The number of kitchen towel rolls to be wrapped in the aforementioned packaging film is between one and four. The packaging using the aforementioned packaging film is caramel packaging, The aforementioned kitchen towel is It has a paper machine-derived uneven pattern applied between the headbox of the paper machine and the inlet of the Yankee dryer, and does not have embossing on the reverse side. The aforementioned kitchen towel has an absorbency of 155 g / m². ２ More than 520g / m ２ The following: In a measuring device comprising a base, two support rods, a movable weight plate, and a weight, wherein the support rods all rise vertically from the base, and insertion holes for each support rod are provided at both ends of the rectangular movable weight plate, the kitchen towel roll is placed on the base and between the support rods, the support rods are inserted through the movable weight plate from above the kitchen towel roll, the movable weight plate is placed on the top surface of the kitchen towel roll, the height of the movable weight plate measured in this state is defined as the initial height h1, and then the weight is placed on the movable weight plate, and as the weight of the weight causes the movable weight plate to slide through the support rods, the height measured in the state where the kitchen towel roll is deformed and sinks is defined as h2, (h2 - h1) A kitchen towel roll product in which the winding flexibility of the kitchen towel roll is calculated as the amount of deformation of the diameter of the kitchen towel roll, and the same measurement is performed by rotating the kitchen towel roll 120 degrees twice, and the average value of the deformation amounts of the three measurements is used as the measured value, wherein the winding flexibility of the kitchen towel roll is 2 mm or more and 12 mm or less.

2. The aforementioned kitchen towel is The paper has, in addition to the uneven pattern derived from the paper machine, an embossed pattern different from the uneven pattern, wherein the depth of the embossed pattern is 0.10 mm or more and 0.80 mm or less. The embossed pattern includes a plurality of individual embosses, The area of ​​the embossed section is 1 mm ２ 40mm or more ２ The following applies, and the unit area of ​​the embossed object is 100 cm². ２ The kitchen towel roll product according to claim 1, wherein the number of items per roll is 20 or more and 1800 or less.

3. The basis weight of the two-ply kitchen towel mentioned above is 32 g / m². ２ 65g / m or more ２ The kitchen towel roll product according to claim 1 or 2, which is as follows:

4. The kitchen towel roll product according to any one of claims 1 to 3, wherein the length of the kitchen towel roll is 24 m or more and 45 m or less.

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