Kitchen towel roll

Abstract

To provide a kitchen towel roll capable of suppressing an increase in roll diameter and of easily and effectively improving the water absorbency (amount of water absorption) of the kitchen towel.SOLUTION: There is provided a three-ply kitchen towel roll, wherein two sheets in three sheets constitute a single embossed bonded sheet; a remaining one sheet in the three sheets is an embossed sheet; in the single embossed bonded sheet and the embossed sheet, a single embossed convex portion of the single embossed bonded sheet faces a non-embossed convex portion of the embossed sheet, and the embossed convex portion of the embossed sheet faces a non-single embossed convex portion of the single embossed bonded sheet to laminate into a nested-style laminated structure; and the single embossed convex portion of the single embossed bonded sheet and the non-embossed convex portion of the embossed sheet are bonded to each other through an adhesive glue interposed between the single embossed convex portion of the single embossed bonded sheet and the non-embossed convex portion of the embossed sheet; and a wrapping density of the kitchen towel is 0.30 m / cm2 or more and 0.90 m / cm2 or less.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0002] In the kitchen, kitchen towel rolls in the form of long kitchen towels wound into a roll are commonly and widely used for draining water and oil from foodstuffs such as vegetables and meat, wiping off oil from frying pans, wiping off stains from dining tables, etc. The kitchen towels pulled out from the kitchen towel roll are cut off at predetermined lengths for use.

[0003] Patent Document 1 proposes a kitchen towel roll that can suppress an increase in the roll diameter while improving the water absorption effect (water retention). The kitchen towel roll of Patent Document 1 has a form in which a kitchen towel made of three sheets laminated together is wound into a roll.

[0004] In Patent Document 1, two of the three sheets constituting the kitchen towel have integral embossed recesses and embossed protrusions due to the two sheets being pressed together during embossing. These two sheets and the remaining sheet of the three sheets are overlapped such that the embossed protrusions of the two sheets are fitted into the embossed recesses of the remaining sheet, leaving gaps, and are bonded together by glue provided on the opposing portions of the embossed protrusions of the two sheets and the embossed recesses of the remaining sheet. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 7104253 Summary of the Invention [Problem to be solved by the invention]

[0006] However, there is room for improvement in terms of water absorbency (amount of water absorbed) of kitchen towels with the above structure. Also, it is desired to simply and effectively improve water absorbency without complicating the laminated structure of the sheets in the kitchen towel.

[0007] An object of the present invention is to provide a kitchen towel roll that can suppress an increase in the roll diameter and can simply and effectively improve the water absorption (amount of water absorbed) of the kitchen towel. [Means for solving the problem]

[0008] As a result of intensive research into solving the above problems, the present inventors have discovered a kitchen towel roll in which a kitchen towel made of three laminated sheets is wound into a roll, in which two of the three sheets are laminated in a single embossed laminate structure to form a single embossed bonded sheet having a single embossed concave portion on one side and a single embossed convex portion corresponding to the single embossed concave portion and a non-single embossed convex portion surrounding the single embossed convex portion on the other side, and the remaining sheet of the three sheets has an embossed concave portion on one side and a non-single embossed convex portion corresponding to the embossed concave portion on the other side. The single embossed bonded sheet and the embossed sheet are laminated in a nested laminate structure in which the single embossed convex portion of the single embossed bonded sheet faces the non-embossed convex portion of the embossed sheet, and the embossed convex portion of the embossed sheet faces the non-single embossed convex portion of the single embossed bonded sheet, and are bonded to each other via an adhesive glue interposed between the single embossed convex portion of the single embossed bonded sheet and the non-embossed convex portion of the embossed sheet, and the kitchen towel has a winding density of 0.30 m / cm. 2 More than 0.90m / cm 2 It has been discovered that the above problems can be solved by a kitchen towel roll characterized in that the winding density is calculated by the following formula: "winding density = (rolled length of kitchen towel x number of kitchen towel sheets) ÷ roll cross-sectional area."

[0009] Specifically, the present invention has the following configuration. [1] A kitchen towel roll in which a kitchen towel made of three laminated sheets is wound into a roll, Two of the three sheets are laminated in a single embossed laminate structure to form a single embossed combined sheet having a single embossed concave portion on one side and a single embossed convex portion corresponding to the single embossed concave portion and a non-single embossed convex portion surrounding the single embossed convex portion on the other side; the remaining sheet of the three sheets is an embossed sheet having embossed recesses on one side and embossed protrusions corresponding to the embossed recesses and non-embossed protrusions surrounding the embossed protrusions on the other side; the single embossed bonded sheet and the embossed sheet are laminated in a nested laminate structure in which the single embossed convex portion of the single embossed bonded sheet faces the non-embossed convex portion of the embossed sheet and the embossed convex portion of the embossed sheet faces the non-single embossed convex portion of the single embossed bonded sheet, and are bonded to each other via an adhesive glue interposed between the single embossed convex portion of the single embossed bonded sheet and the non-embossed convex portion of the embossed sheet; The roll density of kitchen towels is 0.30m / cm 2 More than 0.90m / cm 2 is as follows: The winding density is calculated by the following formula: Roll density = (Roll length of kitchen towel × Number of sheets of kitchen towel) ÷ Cross-sectional area of ​​roll A kitchen towel roll characterized by: [2] The length of the roll of kitchen towel is 9.0 m or more and 35.0 m or less, and the basis weight of each of the three sheets is 14.0 g / m 2 More than 30.0g / m 2 The kitchen towel roll according to [1], characterized in that: [3] The kitchen towel roll according to [1] or [2], characterized in that the paper thickness of the kitchen towel is 460 μm or more and 1000 μm or less. [4] A kitchen towel roll according to any one of [1] to [3], characterized in that the embossing pattern of the single embossed recesses of the single embossed bonding sheet and the embossing pattern of the embossed recesses of the embossed sheet are the same pattern. Effect of the Invention

[0010] According to the present invention, it is possible to provide a kitchen towel roll that can suppress an increase in the roll diameter and can simply and effectively improve the water absorption (amount of water absorbed) of the kitchen towel. [Brief description of the drawings]

[0011] [Figure 1] 1 is a schematic diagram of a kitchen towel roll according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic diagram illustrating the configuration of a kitchen towel. [Diagram 3] FIG. 4 is a diagram illustrating a method for measuring the area and depth of an embossed depression. [Figure 4] FIG. 1 is a schematic diagram of an example of a kitchen towel roll manufacturing facility. [Diagram 5] FIG. 1 is a diagram illustrating a method for measuring the water absorption of a kitchen towel. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, the same reference numerals indicate the same or similar configurations. The following embodiments and drawings are described for illustrative purposes and are not intended to limit the present invention.

[0013] <First embodiment> The kitchen towel roll according to the first embodiment of the present invention has the following configurations (1) to (6). (1) A kitchen towel roll is a kitchen towel made of three sheets laminated together and wound into a roll. (2) Two of the three sheets are laminated in a single embossed type laminate structure to form a single embossed combined sheet having a single embossed recess on one side and a single embossed convex portion corresponding to the single embossed recess and a non-single embossed convex portion surrounding the single embossed convex portion on the other side. (3) The remaining sheet of the three sheets is an embossed sheet having an embossed depression on one side and an embossed protrusion corresponding to the embossed depression and a non-embossed protrusion surrounding the embossed protrusion on the other side. (4) The single embossed bonding sheet and the embossed sheet are laminated in a nested laminate structure in which the single embossed convex portion of the single embossed bonding sheet faces the non-embossed convex portion of the embossed sheet and the embossed convex portion of the embossed sheet faces the non-single embossed convex portion of the single embossed bonding sheet, and are bonded together via an adhesive glue interposed between the single embossed convex portion of the single embossed bonding sheet and the non-embossed convex portion of the embossed sheet. (5) The roll density of the kitchen towel is 0.30 m / cm 2 More than 0.90m / cm 2 The winding density is expressed by the following formula: Roll density = (Roll length of kitchen towel × Number of sheets of kitchen towel) ÷ Cross-sectional area of ​​roll It is calculated by:

[0014] (Kitchen towel roll) Fig. 1 is a schematic diagram of a kitchen towel roll 100 according to a first embodiment of the present invention. Fig. 1(a) is an overall perspective view of the kitchen towel roll 100, and Fig. 1(b) is a schematic diagram showing an end face of the kitchen towel roll 100.

[0015] The kitchen towel roll 100 is formed by winding the kitchen towel 30 around a paper tube 5 in a roll shape.

[0016] (Paper tube) 1, cardboard tube 5 has a cylindrical shape. The outer diameter of cardboard tube 5, that is, the core diameter DC, is set according to the size of the members (core, hooks, etc.) of the kitchen towel roll holder for supporting and rotating the kitchen towel roll, and is generally about 38 mm to 40 mm.

[0017] (Perforation) 1(a), kitchen towel 30 may optionally have tear perforations 30m for facilitating separation of kitchen towel 30 from the roll portion after it has been unwound from kitchen towel roll 100. Tear perforations 30m are generally formed by continuous small holes extending in the width direction (CD direction) of kitchen towel 30, and are provided at predetermined intervals L along the longitudinal direction (MD direction) of kitchen towel 30. In kitchen towel 30, a section sandwiched between two perforations 30m adjacent in the longitudinal direction (MD) is hereinafter also referred to as one cut.

[0018] (Roll diameter) 1(b), in an embodiment of the present invention, the roll diameter DR of kitchen towel 30 wound into a roll is set to a size that can be accommodated in a typical kitchen towel roll holder and supported rotatably. The roll diameter DR of kitchen towel roll 100 is, for example, 100 mm to 125 mm, and may be 110 mm to 120 mm.

[0019] The roll diameter DR can be determined by the following method. First, the circumference of kitchen towel roll 100 is measured using a tape measure at three positions, namely, both ends and the center in the axial direction of kitchen towel roll 100. Next, the measured circumference is divided by pi, 3.14, to calculate the roll diameter at each of the three positions, and the average of the roll diameters at the three positions is calculated. The calculated average is set as the roll diameter DR of kitchen towel roll 100.

[0020] (Volume length) In an embodiment of the present invention, the roll length, which is the length of kitchen towel 30 wound around paper tube 5, is preferably 9 m or more and 35 m or less.

[0021] The roll length can be determined, for example, by actually measuring the length of kitchen towel 30 while unwinding it from kitchen towel roll 100. Alternatively, the roll length can be determined by calculation, for example, from the settings of the equipment during production. The roll length may be calculated, for example, by multiplying the dimension L of one cut in the longitudinal direction (MD) by the number of cuts included in kitchen towel roll 100.

[0022] If the winding length is too long, the winding diameter generally becomes large, making it difficult for kitchen towel roll 100 to fit into a typical kitchen towel roll holder. Therefore, it is possible to set the paper thickness (thickness including embossing) of kitchen towel 30 low to keep the winding diameter of kitchen towel roll 100 within a suitable range, but in this case, the reduction in the paper thickness (thickness including embossing) of kitchen towel 30 reduces water absorbency (amount of water absorption), making it impossible to obtain the desired water absorbency (amount of water absorption).

[0023] Alternatively, in order to keep the roll diameter within a suitable range without changing the roll length, it may be necessary to make design changes such as limiting the basis weight of sheets 12, 14, and 20 constituting kitchen towel 30.

[0024] If the roll length is too short, it will be shorter than typical commercially available products, resulting in poor cost performance in terms of storage and transportation and poor market competitiveness as a kitchen towel roll product.

[0025] Therefore, in the embodiment of the present invention, the roll length of kitchen towel 30 is preferably within the above-mentioned range.

[0026] (Kitchen towels) FIG. 2 is a schematic diagram illustrating the configuration of the kitchen towel 30. FIG. 2(a) is a schematic perspective view of a section (one cut) of the kitchen towel 30 unwound from the roll-shaped portion of the kitchen towel roll 100 of FIG. 1(a), which is sandwiched between two adjacent perforations 30m in the longitudinal direction (MD). FIG. 2(a) shows the surface of the kitchen towel 30 that is radially outward in the kitchen towel roll 100 of FIG. 1 (hereinafter, simply referred to as the outer surface of the kitchen towel roll 100). FIG. 2(b) is a schematic enlarged view of the portion indicated by the symbol IIb in FIG. 2(a). FIG. 2(c) is a schematic cross-sectional view taken along the line indicated by the symbol IIc-IIc in FIG. 2(b).

[0027] 2(c), kitchen towel 30 according to the embodiment of the present invention is a three-ply (so-called three-ply) laminated sheet formed by laminating three sheets 12, 14, and 20. Hereinafter, kitchen towel 30 is also referred to as laminated sheet 30.

[0028] (Sheet) The sheets 12, 14, and 20 that are components of the kitchen towel 30 are obtained by papermaking a slurry that contains a pulp component, which is a fiber raw material.

[0029] (Pulp component) Pulp components include wood pulp, non-wood pulp, and waste paper pulp.

[0030] Examples of wood pulp produced using wood as a raw material include chemical pulps such as hardwood pulp (hardwood kraft pulp (LKP)), softwood pulp (softwood kraft pulp (NKP)), sulfite pulp (SP), dissolving pulp (DP), soda pulp (AP), unbleached kraft pulp (UKP), and oxygen bleached kraft pulp (OKP). Other examples include semi-chemical pulps such as semi-chemical pulp (SCP) and chemi-ground wood pulp (CGP), groundwood pulp (GP), and thermomechanical pulp (TMP, BCTMP), but are not limited thereto.

[0031] Non-wood pulps produced using plants or animals other than wood as raw materials include, but are not limited to, cotton pulps such as cotton linters and cotton lint, non-wood pulps such as hemp, wheat straw, and bagasse, and cellulose, chitin, and chitosan isolated from sea squirts and seaweed.

[0032] The waste paper pulp is pulp produced from waste paper, i.e., pulp that has been made into paper. Examples of waste paper pulp include, but are not limited to, so-called milk carton pulp made from paper cartons for filling and packaging liquids, and deinked pulp made from newspapers, magazines, etc.

[0033] The pulp component may be one of the above-mentioned types alone or a mixture of two or more types. The pulp components of sheets 12, 14, and 20 may be the same or different. These pulp components greatly affect the quality of kitchen towel 30, so they are appropriately blended in a predetermined type and blending ratio according to the required quality. For example, only wood pulp (100% by mass) may be used as the pulp component.

[0034] As the wood pulp, at least one selected from coniferous pulp and hardwood pulp can be preferably used. Coniferous pulp has long and strong fibers, and can impart strength to the sheet produced. Hardwood pulp has short and flexible fibers, and can provide uniformity, good texture, softness, and the like to the sheet produced. In an embodiment of the present invention, it is preferable to use coniferous pulp and hardwood pulp in combination, and it is more preferable to use coniferous kraft pulp (NKP) and hardwood kraft pulp (LKP) in combination.

[0035] (optional ingredient) Various chemicals may be added as optional components to the sheets 12, 14, and 20 in order to achieve the required quality and stabilize the operation. Examples of optional components include dry strength agents, wet strength agents, softeners, bulking agents, dyes, fragrances, dispersants, drainage improvers, pitch control agents, retention improvers, and sizing agents. Examples of dry strength agents include cationic starch, polyacrylamide (PAM), and carboxymethyl cellulose (CMC). Examples of wet strength agents include polyamide epichlorohydrin, urea, melamine, and thermally crosslinked polyacrylamide. Examples of softeners include anionic surfactants, nonionic surfactants, cationic surfactants, and zwitterionic surfactants. The optional components may be used alone or in combination of two or more. The optional components may be different between the sheets 12, 14, and 20.

[0036] (sheet basis weight) In an embodiment of the present invention, the basis weight of each of the three sheets 12, 14, and 20 constituting the kitchen towel 30 (i.e., per ply) is 10 g / m 2 More than 30g / m 2 or less, preferably 13 g / m 2 More than 25g / m 2 More preferably, it is 15 g / m or less. 2 More than 20g / m 2 The basis weights of the sheets need only be within the above range, and the sheets are not limited to being the same in basis weight, and may be different in basis weight.

[0037] Generally, the pulp component, which is the main component constituting the sheets 12, 14, and 20, has good water absorbency (absorption capacity). When the basis weight of a sheet is low, the absolute amount of the pulp component contained in the sheet is also low, and as a result, the water absorbency (absorption capacity) of the sheet itself and the kitchen towel 30 containing the sheet is low.

[0038] On the other hand, as the basis weight of the sheet increases, the thickness of the sheet also tends to increase accordingly. If a thicker sheet is used, the thickness of 3-ply kitchen towel 30 (including the thickness of the embossing) increases, and when made into kitchen towel roll 100, it may not fit within the desired roll diameter DR.

[0039] At this time, one method for achieving the desired roll diameter DR is to reduce the paper thickness of kitchen towel 30. However, this method reduces the water absorption (absorption amount) of kitchen towel 30 due to the reduction in the paper thickness of kitchen towel 30. Another method for achieving the desired roll diameter DR is to reduce the roll length. However, this method results in poor cost performance in storage and transportation as well as poor market competitiveness as a kitchen towel roll product.

[0040] Therefore, in the embodiment of the present invention, the basis weight (basis weight per ply) of each of the sheets 12, 14, 20 is preferably within the above-mentioned range.

[0041] The basis weight of the sheet (basis weight per ply) can be measured in accordance with the provisions of Japanese Industrial Standard JIS P8124.

[0042] (Embossed) 1(a) and 2, kitchen towel 30 is embossed over the entire surface (whole surface) on both sides.

[0043] Specifically, referring to (a) of Fig. 1 and (a) of Fig. 2, on one side of the kitchen towel 30 (the outer surface of the kitchen towel roll 100), an embossed pattern consisting of a large number of embossed recesses 10ed and forming a substantially hexagonal shape in plan view is repeatedly formed with flat portions sandwiched between each other. Referring to (b) of Fig. 2, in this example, each embossed recess 10ed (shown by a solid line in the figure) included in one embossed pattern has a dot-like shape that shows a substantially triangular shape in plan view. Referring to (c) of Fig. 2, this embossed pattern is integrally formed with two sheets 12 and 14 out of the three sheets that make up the kitchen towel 30.

[0044] (Single embossed bonded sheet) Referring to FIG. 2(c), of the three sheets 12, 14, and 20 of kitchen towel 30, two sheets 12 and 14 have a so-called single embossed laminated structure and form an integrated sheet (hereinafter also referred to as a single embossed bonded sheet) 10.

[0045] The single embossed bonded sheet 10 has an embossed recess 10ed on one side (the side facing the sheet 12 in this embodiment) and an embossed protrusion 10ep corresponding to the embossed recess 10ed on the other side (the side facing the sheet 14 in this embodiment). On the side having the embossed recess 10ed, the embossed recess 10ed is surrounded by a non-embossed recess 10ned. On the side having the embossed protrusion 10ep, the embossed protrusion 10ep is surrounded by a non-embossed protrusion 10nep.

[0046] (Single embossed) The single embossed laminated structure can be obtained by embossing a laminated sheet obtained by stacking a predetermined number of sheets (two sheets, 12 and 14 in this embodiment) by pressing the convex portion of an embossing roll only from one side (the side of sheet 12 in this embodiment) of the laminated sheet to form an embossed concave portion (embossed concave portion 10ed in this embodiment) on one side (the side of sheet 12 in this embodiment) of both sides of the sheet to be embossed, and an embossed convex portion (embossed convex portion 10ep in this embodiment) formed by the back side of the embossed concave portion on the other side (the side of sheet 14 in this embodiment). This processing is also called single embossing. According to the single embossing, the same pattern of embossed concave portions is imparted to the entirety of the multiple sheets (two sheets, 12 and 14 in this embodiment) constituting the laminated sheet.

[0047] (Temporary bond) In the single embossed bonded sheet 10, the constituent sheets 12 and 14 are integrated and bonded by being pressed simultaneously during single embossing. This bond can be easily released by applying a force to the constituent sheets 12 and 14 in a direction away from each other, and is hereinafter also referred to as a temporary bond.

[0048] The shape of the embossed pattern of the single embossed bonded sheet 10 and the shape of the embossed recesses 10ed described with reference to the drawings are merely examples and do not limit the present invention. As the embossed pattern of the single embossed bonded sheet 10, a dotted, linear, or combination of these embossed patterns formed over substantially the entire surface of the sheet can be applied. As the shape of the embossed recesses 10ed, in addition to a triangle, any shape such as a circle, a square, a rectangle, a rhombus, a pentagon, any other polygon, or a flower shape, or any combination of these shapes can be applied. The dimensions (e.g., depth, area, etc.) and density of the multiple embossed recesses 10ed included in the embossed pattern may be the same or different from each other.

[0049] (embossed sheet) Referring to Figure 1(a) and Figures 2(b) and (c), on the other surface of kitchen towel 30 (the inner surface of kitchen towel roll 100), an embossed pattern consisting of numerous embossed recesses 20ed and forming an approximately hexagonal shape in a planar view is repeatedly formed with flat portions between each of the recesses.

[0050] 2(b), in this example, each embossed depression 20ed included in one embossed pattern has a dot-like shape that is approximately triangular in plan view. Note that the embossed depression 20ed is formed on the back side of the kitchen towel 30 in FIG. 2(b). Therefore, the embossed depression 20ed and the corresponding embossed protrusion 20ep are shown perspectively by dotted lines in the figure.

[0051] With reference to FIG. 2(c), this embossed pattern is formed on one sheet 20 of the three sheets that make up kitchen towel 30.

[0052] Hereinafter, in this specification, of the three sheets constituting the kitchen towel (laminate sheet) 30, the two sheets 12, 14 which are embossed and integrated together will be referred to as the single embossed combined sheet 10, while the single embossed sheet 20 will also be referred to as the embossed sheet 20.

[0053] In addition, in the following description, the embossed recess 10ed, the embossed protrusion 10ep, the non-embossed recess 10ned, and the non-embossed protrusion 10nep of the single embossed bonding sheet 10 will also be referred to as the single embossed recess 10ed, the single embossed protrusion 10ep, the non-single embossed recess 10ned, and the non-single embossed protrusion 10nep, respectively.

[0054] The shapes of the embossed pattern of the embossed sheet 20 and the shapes of the embossed recesses 20ed described with reference to the drawings are merely examples and do not limit the present invention. As the embossed pattern, dots, lines, or a combination of these embossed patterns formed over substantially the entire surface of the sheet can be applied. As the shape of the embossed recesses 20ed, in addition to a triangle, any shape such as a circle, a square, a rectangle, a rhombus, a pentagon, other polygons, a flower shape, or any combination of these shapes can be applied. The dimensions (e.g., depth, area, etc.) and density of the multiple embossed recesses 20ed included in the embossed pattern may be the same or different from each other.

[0055] In an embodiment of the present invention, the embossed pattern and the shape, dimensions, density, etc. of the embossed recesses 20ed of the embossed sheet 20 may be the same as or different from the embossed pattern and the shape, dimensions, density, etc. of the single embossed recesses 10ed of the single embossed bonded sheet 10.

[0056] (Area of ​​embossed recess) In the embodiment of the present invention, the area of ​​the single embossed recess 10ed of the single embossed bonding sheet 10 is 0.71 mm 2 Over 4.42mm 2 less than or equal to 1.20 mm, preferably 2 More than 3.40mm 2 The area of ​​the embossed recess 20ed of the embossed sheet 20 is 0.71 mm 2 Over 4.42mm 2 less than or equal to 1.20 mm, preferably 2 More than 3.40mm 2 The following is the result.

[0057] (Embossed recess depth) In an embodiment of the present invention, the depth of the single embossed recess 10ed of the single embossed bonded sheet 10 is 220 μm to 700 μm, preferably 300 μm to 650 μm. The depth of the embossed recess 20ed of the embossed sheet 20 is 220 μm to 700 μm, preferably 300 μm to 650 μm.

[0058] (Method of measuring the area and depth of embossed recesses) The area and depth of the single embossed recess 10ed of the single embossed bonded sheet 10, and the area and depth of the embossed recess 20ed of the embossed sheet 20 can be measured by using a shape measuring laser microscope together with software for observing, measuring, and analyzing images from the shape measuring laser microscope.

[0059] A shape measuring laser microscope uses a laser light source, which is a point light source, to scan the XY plane in the observation field of view, dividing it into multiple pixels, via an objective lens, and detects the reflected light from each pixel with a light receiving element. The objective lens is then driven in the height (Z-axis) direction, and the height information and reflected light amount are detected, with the Z-axis position with the highest reflected light amount as the focal point. By repeating the scan in this way, an ultra-deep light image and height image (information) that are in focus as a whole can be obtained. The laser light source is a pinhole confocal optical system, so the measurement precision is high.

[0060] As the shape measuring laser microscope, a one-shot 3D shape measuring instrument VR-3200 (manufactured by KEYENCE Corporation) can be used. As the observation, measurement, and image analysis software, the analysis application VR-H2A (manufactured by KEYENCE Corporation) can be used.

[0061] The area of ​​the embossed recess 10ed can be measured using the one-shot 3D shape measuring device VR-3200 and the analysis application VR-H2A according to a known method, for example, the method disclosed in Japanese Patent No. 6606147. The measurement conditions are a magnification of 12 times and a field area of ​​24 mm x 18 mm. The measurement magnification and field area may be appropriately changed depending on the desired size of the embossment.

[0062] The measurement method will be outlined with reference to Fig. 3. Fig. 3 is a diagram for explaining a method for measuring the area and depth of a single embossed recess 10ed of a single embossed bonded sheet 10, taking as an example the single embossed recess 10ed. Fig. 3(a) is a schematic diagram of a kitchen towel 30 viewed from the surface on the single embossed bonded sheet 10 side, Fig. 3(b) is a schematic diagram of a cross section of the single embossed bonded sheet 10, Fig. 3(c) is a schematic diagram of one single embossed recess 10ed viewed from above, and Fig. 3(d) is a diagram showing an example of a cross-sectional curve of a height profile on an XY plane measured by a shape measuring laser microscope.

[0063] The method for measuring the area and depth of the single embossed recess 10ed of the single embossed bonded sheet 10, which will be described with reference to Fig. 3, can also be applied to the area and depth of the embossed recess 20ed of the embossed sheet 20, so a duplicated description will be omitted. In this case, the measurement is performed on the embossed sheet 20 side of the kitchen towel 30.

[0064] [Area of ​​embossed recesses] The area of ​​the single embossed depressions 10ed is measured on the side of the single embossed bonded sheet 10 having the single embossed depressions 10ed, out of both sides of the kitchen towel 30. The area of ​​the single embossed depressions 10ed is measured for any 10 single embossed depressions 10ed in the CD direction (width direction) of the kitchen towel 30, and the average value calculated from the obtained measurements is regarded as the area per single embossed depression 10ed.

[0065] 3(a), when selecting any 10 single embossed recesses 10ed, any 10 recesses are selected from the single embossed recesses 10ed located at a position indicated by a straight line M parallel to the CD direction of kitchen towel 30. The position of this straight line M is the center of the 20th cut of kitchen towel 30 counting from the outermost side of kitchen towel roll 100.

[0066] According to a height profile (not shown) on the XY plane obtained by a shape measuring laser microscope, the height of the surface of the kitchen towel 30 is expressed by shading. In the XY plane image (not shown), each single embossed depression 10ed is shown as a dark colored portion. The single embossed depression 10ed and the non-single embossed depression 10ned can be distinguished by the color shading.

[0067] 3(c) is a schematic diagram of one single embossed depression 10ed viewed from above. In the figure, an embossed peripheral edge Erim indicates the boundary between the single embossed depression 10ed and the non-single embossed depression 10ned. The inside of the embossed peripheral edge Erim is the single embossed depression 10ed. In this embodiment, the single embossed depression 10ed has a substantially triangular shape when viewed from above.

[0068] The area of ​​the single embossed recess 10ed is measured according to the following procedure. (1) The length of the line segment between the two most distant points of the peripheral edge Erim of the single embossed recess 10ed in the XY plane is defined as the length of the longest part a of the peripheral edge Erim of the embossment. This length can be found as the distance on the XY plane between inflection points Z1 and Z2 in the cross-sectional curve of the height profile on the XY plane taken with a shape measuring laser microscope as shown in (d) of Figure 3. (2) Next, similarly, the length of the line segment between the two farthest points of the embossed peripheral edge Erim in the XY plane in a direction perpendicular to the longest part a is defined as the longest part b of the embossed peripheral edge Erim. (3) The area of ​​the single embossed depression 10ed is calculated from the values ​​of the longest part a and the longest part b. With reference to (c) of Fig. 3, in this embodiment, the single embossed depression 10ed has a substantially triangular shape in the XY plane, with the longest part a being the base of the triangle and the longest part b being the height of the triangle. Using the formula for the area of ​​a triangle, the product (a x b) of the longest part a and the longest part b is divided by 2 to calculate the area of ​​the single embossed depression 10ed.

[0069] For calculating the area, a formula suitable for the shape of the single embossed recess 10ed is used. For example, if the XY plane shape of the single embossed recess 10ed is a substantially perfect circle, the average value of the longest part a and the longest part b is taken as the average diameter d, half of which is taken as the radius r, and the formula for the area of ​​a circle is used to calculate the average diameter d. 2 The value obtained by calculating the above is determined as the area of ​​the single embossed recess 10ed.

[0070] Similarly, for example, when the XY plane shape of the single embossed recess 10ed is substantially rectangular, the product (a×b) of the longest part a and the longest part b is calculated as the area of ​​the single embossed recess 10ed.

[0071] [Embossed recess depth] The depth (embossing depth) of the single embossed recess 10ed of the single embossed bonding sheet 10 can be measured at the same time as the area measurement using the same shape measuring laser microscope and image observation / measurement / image analysis software used to measure the area of ​​the single embossed recess 10ed.

[0072] With reference to (b) and (d) of FIG. 3, the embossing depth D is determined by measuring the height difference of the embossing using a shape measuring laser microscope.

[0073] The embossing depth analysis is carried out according to the following procedure. (1) The waviness of the entire field of view is removed from the target image by performing surface shape correction. (2) By measuring the line roughness, the roughness profile between two points on either side of the embossment to be measured is measured, and tilt correction is performed. (3) The embossing depths Z1 and Z2 at the embossing start point X1 and end point X2 are calculated from the data of the position X (μm) in the planar direction of the embossing and the embossing depth Z (μm) (see FIG. 3(d)). (4) The average value of emboss depth Z1 and Z2 is taken as the maximum emboss depth Z max The minimum value Z of the embossing depth located between the embossing start point X1 and the embossing end point X2 is min The difference between these is defined as the embossing depth ΔZ (see FIG. 3(d)). ΔZ=Zmax-Zmin (5) The above measurements (1) to (4) are carried out for any 10 single embossed recesses 10ed of kitchen towel 30, and the average value of ΔZ is taken as emboss depth D.

[0074] Referring to FIG. 2(c), the single embossed bonded sheet 10 and the embossed sheet 20 are integrated together by an intervening adhesive glue G to form an embossed laminate structure.

[0075] (Nested Embossing) 2(c), the single embossed bonded sheet 10 and the embossed sheet 20 form an embossed laminated structure in such a manner that the single embossed convex portion 10ep of the single embossed bonded sheet 10 faces the non-embossed convex portion 20nep of the embossed sheet 20, and the embossed convex portion 20ep of the embossed sheet 20 faces the non-single embossed convex portion 10nep of the single embossed bonded sheet 10. The single embossed bonded sheet 10 and the embossed sheet 20 are bonded via an adhesive G interposed between the single embossed convex portion 10ep of the single embossed bonded sheet 10 and the non-embossed convex portion 20nep of the embossed sheet 20. In this manner, an embossed laminate structure in which the embossed convex portion of one sheet fits into the non-embossed convex portion of the other sheet (the non-embossed convex portion of the other sheet forms a recess relative to the embossed convex portion of the other sheet), and the top of the embossed convex portion and the bottom of the non-embossed convex portion are bonded with adhesive so as to leave a gap in the fitting area, is also called a "nested emboss."

[0076] (adhesive glue) A known adhesive used in kitchen towels having a laminated structure can be used as the adhesive paste G that bonds the single embossed bonded sheet 10 and the embossed sheet 20. For example, a cellulose-based adhesive such as polyvinyl alcohol (PVA), starch, modified starch, or carboxymethyl cellulose (CMC) can be used.

[0077] 2(c), in an embodiment of the present invention, adhesive paste G is interposed between the single embossed convex portion 10ep of the single embossed bonding sheet 10 and the non-embossed convex portion 20nep of the embossed sheet 20. Such a configuration can be achieved by applying adhesive paste G to the top of the single embossed convex portion 10ep of the single embossed bonding sheet 10 by a known device such as an applicator including an applicator roll as exemplified in FIG. 4, and then combining the single embossed bonding sheet 10 and the embossed sheet 20.

[0078] (This combination) When applying the adhesive paste G, if a low-viscosity adhesive paste G is used, the adhesive paste G applied to the surface of the sheet may seep into the sheet and seep out from the opposite surface of the sheet, which is called a glue run-out phenomenon. By utilizing this glue run-out phenomenon, in an embodiment of the present invention, low-viscosity adhesive paste G is applied to the embossed protrusions 10ep of the single-embossed bonded sheet 10, and is allowed to permeate from the sheet 14 side to the sheet 12 side, thereby strengthening the bond between the sheets 14 and 12 that constitute the single-embossed bonded sheet 10. In this specification, this bond is also referred to as a permanent bond, in contrast to the above-mentioned temporary bond.

[0079] The sheets 12 and 14 constituting the single embossed bonded sheet 10, which are integrated by temporary bonding, could easily be separated by applying force to the constituent sheets 12 and 14 in a direction that would move them away from each other. However, by using adhesive glue G in this permanent bond, the bond is strengthened and the two sheets are less likely to separate.

[0080] In order to enable a nested embossed laminated structure, the non-embossed convex portion 20nep of the embossed sheet 20 is generally larger than the single embossed portion 10ep of the single embossed combined sheet 10. This forms a gap between the single embossed convex portion 10ep and the non-embossed convex portion 20nep of the embossed sheet 20 that receives it. A single non-embossed convex portion 20nep may include multiple single embossed convex portions 10ep.

[0081] Similarly, in order to enable a nested embossed laminated structure, the non-single embossed convex portion 10nep of the single embossed bonded sheet 10 is generally larger than the embossed convex portion 20ep of the embossed sheet 20. This forms a gap between the embossed convex portion 20ep and the non-single embossed convex portion 10nep of the single embossed bonded sheet 10 that receives it. A single non-single embossed convex portion 10nep may include multiple embossed convex portions 20ep.

[0082] By forming kitchen towel 30 in a nested embossed laminated structure, a gap is maintained between single embossed bonded sheet 10 and embossed sheet 20, thereby providing kitchen towel 30 with bulk.

[0083] In the kitchen towel 30 according to the embodiment of the present invention having the above-described configuration, a large amount of water can be absorbed not only in the tiny gaps present inside each of the three sheets 12, 14, and 20 that make up the kitchen towel 30, but also in the gap between the single embossed bonded sheet 10 and the embossed sheet 20, and also in the gap between the two constituent sheets 12, 14 of the single embossed bonded sheet 10.

[0084] Therefore, the kitchen towel 30 according to the embodiment of the present invention, which has a laminated structure of the single embossed bonded sheet 10 and the embossed sheet 20 in a nested embossed form, can exhibit a good water absorption effect (water retention).

[0085] (Tip to Tip style embossed laminated structure) Here, as an embossed laminated structure of a kitchen towel, a Tip to Tip type embossed laminated structure is generally known in contrast to the nested embossed type. The Tip to Tip type refers to a type in which the embossed convex portion of one sheet and the embossed convex portion of the other sheet are joined together via adhesive glue G in a form in which they are in contact with each other to form an embossed laminated structure. In the case of a Tip to Tip type embossed laminated structure, the gap between the non-embossed convex portions of the two overlapping sheets is relatively large, so the kitchen towel has a good water absorption effect (water retention). However, on the other hand, the paper thickness of the kitchen towel tends to be high, and the roll diameter of the kitchen towel roll 100 tends to be excessively large.

[0086] In contrast, as described above, kitchen towel 30 according to an embodiment of the present invention has an embossed laminated structure in a nested embossed form of single embossed bonded sheet 10 and embossed sheet 20, which not only provides good water absorption (water retention) but also suppresses an increase in the roll diameter. As a result of further intensive research, the inventors have found that by controlling the winding density of kitchen towel (laminated sheet) 30 in kitchen towel roll 100 within a suitable range, it is possible to simply and effectively improve the water absorption (amount of water absorbed) of kitchen towel 30 rolled into kitchen towel roll 100.

[0087] (winding density) In the kitchen towel roll 100 according to the embodiment of the present invention, the winding density of the kitchen towel (laminated sheet) 30 is 0.30 m / cm 2 More than 0.90m / cm 2 less than or equal to 0.31 m / cm 2 More than 0.75m / cm 2 More preferably, it is 0.35 m / cm or less. 2 More than 0.69m / cm 2 The following is the result.

[0088] The winding density is calculated according to the following formula (I): (Roll density) = (Roll length of kitchen towel × number of kitchen towel sheets) ÷ (Roll cross-sectional area) (I)

[0089] The cross-sectional area of ​​the roll, i.e., the cross-sectional area of ​​kitchen towel roll 100, corresponds to the area of ​​the portion of the end face of kitchen towel roll 100 shown in Figure 1 (b) that is made up of kitchen towel. In other words, the cross-sectional area of ​​the roll is the area of ​​a circle whose diameter is the winding diameter DR minus the area of ​​a circle whose diameter is the core diameter DC, which is the outer diameter of cardboard tube 5. The cross-sectional area of ​​the roll is calculated by the following formula (II). (Roll cross-sectional area) = (Roll diameter DR ÷ 2) 2 × Pi - (Core diameter DC ÷ 2) 2 × Pi (II)

[0090] For example, when the winding length is 11.5 m, the winding diameter DR is 116 mm, and the core diameter DC of the paper tube 5 is 40 mm, the number of sheets of the kitchen towel 30 is 3, so that the winding density is calculated from the formulas I and II as follows: (11.5 m×3)÷{(116 mm÷2) 2 ×Pi-(40mm÷2) 2 × pi}, which is about 0.372 m / cm 2 It becomes.

[0091] In the embodiment of the present invention, the winding density is 0.90 m / cm 2 By setting the thickness as described below, the paper thickness of kitchen towel 30 is prevented from becoming excessively thin. As a result, kitchen towel 30 unwound from kitchen towel roll 100 maintains a high paper thickness compared to when the paper thickness is higher than this. Therefore, kitchen towel 30 of such kitchen towel roll 100 has improved water absorbency (amount of water absorbed).

[0092] On the other hand, if the winding density is too low, the paper thickness of kitchen towel 30 will be thick, and the water absorbency (amount of water absorbed) of kitchen towel 30 will be improved, but the winding diameter of kitchen towel roll 100 will be large. If the winding diameter of kitchen towel roll 100 is too large, it will be larger than the size that can be accommodated in a typical kitchen towel roll holder and supported rotatably, which is not preferable.

[0093] (Action and effect) In the first embodiment of the present invention, a nested embossed laminate structure of a single embossed bonded sheet 10 and an embossed sheet 20 is adopted as the embossed laminate structure of kitchen towel 30, thereby improving the water absorption effect (water retention) while suppressing an increase in the roll diameter, and by setting the winding density of kitchen towel 30 within the above range, the water absorption (water absorption amount) can be improved simply and effectively.

[0094] (Example of a method for manufacturing a kitchen towel according to an embodiment of the present invention) An example of a manufacturing method for producing the roll-shaped kitchen towel 30 (kitchen towel roll 100) according to the embodiment of the present invention will be described.

[0095] (Manufacture of raw rolls) First, the sheets 12, 14, and 20 that are the components of the kitchen towel 30 are wound into rolls to produce raw cloth rolls. In detail, using a papermaking machine (not shown), wide (several times to twenty-odd times the width of the kitchen towel roll 100) and long sheets 12, 14, and 20 are made from a papermaking slurry (paper material) and wound up, to produce single-ply raw cloth rolls with the sheets 12, 14, and 20 wound up.

[0096] As the papermaking machine, for example, a known papermaking machine such as a twin wire former type, a cylinder former type, a suction pressed former type, or a crescent former type can be used.

[0097] The papermaking machine may be equipped with a creping section that performs creping. In the creping section, during the drying of the sheet (web) to be made in the raw roll manufacturing process, a creping doctor can give the sheet very fine wavy wrinkles called crepes as necessary. Creping can give the sheet softness, bulkiness (bulk feeling), moisture absorbency, aesthetic appearance (crepe shape), and good touch.

[0098] The papermaking machine may also include a calendar section. In the calendar section, the dried sheet may be subjected to a calendaring process, in which the sheet is sandwiched and pressed from above and below by a pair of calendar rolls, as necessary. This compresses the sheets 12, 14, 20, adjusting and equalizing the paper thickness, and smoothing the surface. The calendaring section may be provided separately from the papermaking machine, and the calendaring process may be performed in any manufacturing process after the raw roll manufacturing process. The calendaring process may be performed in multiple stages.

[0099] (Kitchen towel manufacturing) FIG. 4 is a diagram showing an example of a manufacturing facility that can be used to manufacture kitchen towel 30, and in particular is a partial schematic diagram showing an example of an embossed laminate structure forming section.

[0100] In the manufacturing apparatus shown in Fig. 4, the embossing rolls 44, 45 are rolls having uneven portions on their outer circumferential surfaces corresponding to a desired embossing pattern. The uneven portions corresponding to the desired embossing pattern are formed on the outer circumferential surfaces of the embossing rolls 44, 45. At least the uneven portions of the embossing rolls 44, 45 are made of metal, and the embossing rolls 44, 45 may be male (convex) steel rolls. The embossing rolls 44, 45 are rotated by a driving means (not shown).

[0101] The nip rolls 43 and 46 are driven rolls that are used in contact with the embossing rolls 44 and 45, and have a cylindrical outer shape. The surface portions of the nip rolls 43 and 46 are formed of a hard rubber-like elastic body such as an elastically deformable hard synthetic rubber.

[0102] The above-mentioned sheets 12 and 14 are unwound from their respective original rolls (not shown), and are stacked via a roll (not shown) for stacking, and are transported as the stacked sheet 10 to an embossed laminate structure forming section shown in FIG. 4.

[0103] 4, the overlapped sheet 10 consisting of sheets 12 and 14 is wrapped around nip roll 46 and passed through the nip between nip roll 46 and embossing roll 45, where it is pressed and embossed according to the shape of the uneven portion of the outer peripheral surface of embossing roll 45, to form a single embossed bonded sheet 10. At this time, as shown in (c) of FIG. 2, the overlapped sheet 10 is passed so that the surface of sheet 12 contacts embossing roll 45 and the surface of sheet 14 contacts nip roll 46.

[0104] Meanwhile, sheet 20 unwound from a roll of original sheet 20 (not shown) is wound around nip roll 43, passed through the nip between nip roll 43 and embossing roll 44, and pressed to be embossed according to the shape of the uneven portion of the outer peripheral surface of embossing roll 44, thereby becoming embossed sheet 20.

[0105] Next, adhesive paste G is applied to the top surface of the embossed convex portion of the embossed overlapping sheet 10 (i.e., the top surface of the single embossed convex portion 10ep of the single embossed bonded sheet 10, referring to (c) of FIG. 2) by an applicator including a glue pan 51, a fountain roll 48, a transfer roll 49, and an applicator roll 50. In detail, the liquid adhesive paste G stored in the glue pan 51 adheres to the surface of the rotating fountain roll 48 and is picked up, transferred to the transfer roll 49 and the applicator roll 50 in that order, and then transferred to the top surface of the embossed convex portion (the surface on the sheet 14 side) of the surface of the overlapping sheet 10 passed between the applicator roll 50 and the embossing roll 45, which is the area in contact with the applicator roll 50.

[0106] Next, the sheet 20 to which the embossing has been applied (embossed sheet 20) and the overlapping sheet 10 to which the adhesive paste G has been applied (single embossed bonded sheet 10) are passed through the nip between embossing rolls 44 and 45, and then wrapped around marriage roll 47. As a result, the single embossed bonded sheet 10 and the embossed sheet 20 are bonded and integrated via the adhesive paste G, and a kitchen towel 30 having a double embossed laminated structure is formed.

[0107] The kitchen towel 30 is fed downstream while the tension is adjusted by the dancer roll 52, and optionally, a tear perforation is formed by a perforation forming section (not shown).

[0108] The perforation forming unit is, simply put, a unit that forms perforations in a sheet that has been fed in. The perforation forming unit is configured to be capable of forming tear perforations 30m that traverse kitchen towel 30 in the width direction (CD direction) at regular intervals L along the longitudinal direction (MD direction) of kitchen towel 30. Any known perforation forming means can be used to form tear perforations 30m.

[0109] Kitchen towel 30 is then sent to a winding section (not shown) and wound into a roll around paper tube 5. Kitchen towel 30 wound into a roll is cut to a width dimension corresponding to the product size, and kitchen towel roll 100 is obtained.

[0110] The above-described manufacturing apparatus and manufacturing method are for illustrative purposes only and are not intended to limit the present invention. Any known manufacturing apparatus and manufacturing method can be used to manufacture the kitchen towel and kitchen towel roll of the present invention.

[0111] For example, in the above example, the manufacturing apparatus shown in Fig. 4 has been described as unwinding sheets from respective original rolls for sheets 12, 14, and 20. However, for sheets 12 and 14, instead of the two original rolls, a single original roll of overlapping sheet 10 formed by overlapping sheets 12 and 14 may be prepared in advance, and overlapping sheet 10 may be unwound from the single original roll.

[0112] Furthermore, in the above example, the manufacture of a raw cloth roll is also described as a method for manufacturing kitchen towel 30. However, the raw cloth roll may be obtained by purchase or the like, and the manufacturing process of the raw cloth roll is not an essential step in the manufacturing method of kitchen towel 30 according to the embodiment of the present invention.

[0113] Also, in the above example, there is no description of the orientation of the front and back sides when kitchen towel 30 is wound around paper tube 5 in the winding section. In the example of Fig. 1, kitchen towel roll 100 is wound so that single embossed bond sheet 10 is on the outer surface side and embossed sheet 20 is on the inner surface side of kitchen towel roll 100, but a configuration in which the front and back sides are reversed is also within the scope of the present invention.

[0114] (Means of achievement) (i) The area and depth of the single embossed depression 10ed of the single embossed bonded sheet 10, (ii) the area and depth of the embossed depression 20ed of the embossed sheet 20, (iii) the density of the single embossed convex portion 10ep / single embossed depression 10ed of the single embossed bonded sheet 10, and (iv) the density of the embossed convex portion 10ep / embossed depression 20ed of the single embossed bonded sheet 10, can be adjusted, for example, by the embossing conditions (shape, number, arrangement, embossing height, density, hardness and pressure of the embossing roll, combination of concave and convex shapes on the outer circumferential surface of the embossing roll, etc.) in the embossed laminate structure forming section of the manufacturing apparatus shown in FIG. 4.

[0115] The winding density of kitchen towel 30 can be adjusted by (i) adjusting the tension used to wind kitchen towel 30 around paper core 5 during the manufacturing process of kitchen towel roll 100, or (ii) adjusting the thickness of sheets 12, 14, 20 used in manufacturing kitchen towel roll 100. Generally, increasing the tension used for winding during the manufacturing process increases the winding density, and decreasing the tension decreases the winding density. Generally, increasing the thickness of sheets 12, 14, 20 used in manufacturing kitchen towel roll 100 increases the winding density, and decreasing the thickness decreases the winding density.

[0116] <Second embodiment> Next, a second embodiment of the present invention will be described. Unless otherwise specified, the configurations applicable to the above-mentioned embodiments are also applicable to this embodiment.

[0117] The second embodiment of the present invention is a preferred embodiment of the above embodiment, in which the roll length of the laminated sheet (kitchen towel) 30 is 9.0 m or more and 35.0 m or less, and the basis weight per sheet of the three sheets 12, 14, and 20 constituting the laminated sheet 30 is 14.0 g / m 2 More than 30.0g / m 2 A kitchen towel roll 100 characterized in that:

[0118] (Action and effect) As described in the first embodiment, the kitchen towel roll 100 according to the embodiment of the present invention has a three-ply laminated sheet 30 having a nested embossed laminated structure, and the winding density of the laminated sheet 30 is 0.30 m / cm 2 More than 0.90m / cm 2 The kitchen towel roll 100 is characterized by the following: The winding density is determined by the winding length of the laminated sheet 30, the number of sheets (number of plies) of the laminated sheet, and the roll cross-sectional area of ​​the kitchen towel roll 100.

[0119] In an embodiment of the present invention, the number of sheets (number of plies) of laminated sheet 30 is fixed at three (3 plies). After careful consideration, the inventors have discovered that the winding density of laminated sheet 30 can be more easily controlled within the above-mentioned range by setting the winding length of laminated sheet 30 and the basis weight per sheet of the three sheets 12, 14, and 20 constituting laminated sheet 30 within the above-mentioned range.

[0120] In this embodiment, the basis weight of each of the three sheets 12, 14, and 20 constituting the laminated sheet 30 is 14.0 g / m 2 More than 30.0g / m 2 or less, preferably 16.0 g / m 2 More than 25.0g / m 2 More preferably, it is 18.0 g / m or less. 2 More than 22.0g / m 2 The basis weight of each of the sheets 12, 14, 20 may be within the above range. The basis weight of each of the sheets 12, 14, 20 may be the same as each other, or one or all of the sheets may have a different basis weight.

[0121] According to the kitchen towel roll 100 of the second embodiment, the water absorbency (amount of water absorbed) of the kitchen towel 30 can be improved more easily and effectively.

[0122] <Third embodiment> Next, a third embodiment of the present invention will be described. Unless otherwise specified, the configurations applicable to the above embodiments are also applicable to this embodiment.

[0123] The third embodiment of the present invention is a preferred aspect of the above-mentioned embodiments, and is a kitchen towel roll characterized in that the paper thickness of the laminated sheet (kitchen towel) 30 is 460 μm or more and 1000 μm or less.

[0124] (Laminated sheet thickness [μm]) In this specification, the paper thickness of the laminated sheet (kitchen towel) 30 refers to the paper thickness of a set of kitchen towels 30 including the three sheets 12, 14, 20 constituting the laminated sheet 30 and the adhesive paste G interposed therebetween.

[0125] The paper thickness of kitchen towel 30 can be measured in accordance with ISO 12625-3 by unwinding kitchen towel 30 from kitchen towel roll 100. During the measurement, the pressure applied between the pressure surfaces is 2 kPa±0.2 kPa.

[0126] (Action and effect) As described in the first embodiment, the kitchen towel roll 100 according to the embodiment of the present invention has a three-ply laminated sheet 30 having a nested embossed laminated structure of a single embossed bonded sheet 10 and an embossed sheet 20, and the winding density of the laminated sheet 30 is 0.30 m / cm 2 More than 0.90m / cm 2 The kitchen towel roll 100 is characterized by the following: The winding density is determined by the winding length of the laminated sheet 30, the number of sheets (number of plies) of the laminated sheet, and the roll cross-sectional area of ​​the kitchen towel roll 100.

[0127] In the third embodiment of the present invention, the number of sheets (number of plies) of the laminated sheet 30 is constant at three (3 plies), and by setting the paper thickness of the laminated sheet 30 within the above-mentioned range, the winding density of the laminated sheet 30 can be easily controlled within the above-mentioned range.

[0128] According to the kitchen towel roll 100 of the third embodiment, the water absorbency (amount of water absorbed) of the kitchen towel 30 can be improved more easily and effectively.

[0129] <Fourth embodiment> Next, a fourth embodiment of the present invention will be described. Unless otherwise specified, the configurations applicable to the above embodiments are also applicable to this embodiment.

[0130] In the first embodiment, it has been explained that in the present invention, the embossed pattern and the shape of the embossed recesses 20ed of the embossed sheet 20 may be the same as or different from the embossed pattern and the shape of the embossed recesses 10ed of the single embossed bonded sheet 10.

[0131] The fourth embodiment of the present invention is a preferred aspect of the above embodiments, and is a kitchen towel roll characterized in that the embossed pattern of the embossed recesses 10ed of the single embossed bonding sheet 10 and the embossed pattern of the embossed recesses 20ed of the embossed sheet 20 are the same pattern.

[0132] As a specific example, referring to (a) of Fig. 1, in this example, the same embossed pattern forming a substantially hexagonal shape is applied to both the single embossed bonded sheet 10 and the embossed sheet 20. Referring to (b) of Fig. 2, in each embossed pattern, the embossed recesses included in the embossed pattern have a dot-like shape showing a substantially triangular shape in a plan view, and the embossed recesses of both embossed patterns have substantially the same dimensions and shapes. That is, in this example, the same pattern is used for the embossed pattern formed by the single embossed recesses 10ed of the single embossed bonded sheet 10 and the embossed pattern formed by the embossed recesses 20ed of the embossed sheet 20.

[0133] (Action and effect) By configuring the single embossed bonded sheet 10 and the embossed sheet 20 constituting both sides of the kitchen towel 30 to have the same or substantially the same embossing pattern, it is possible to reduce the difference between the front and back of the kitchen towel 30. As a result, the water absorption speed of the kitchen towel 30 can be effectively improved without any difference between the front and back.

[0134] (Other: Density of embossed convex parts (density of embossed concave parts)) In the embodiment of the present invention, the density of the single embossed protrusions 10ep of the single embossed bonding sheet 10 is preferably 3 pieces / cm 2 More than 30 pieces / cm 2 The following is the result.

[0135] In this specification, the density of the single embossed protrusions 10ep of the single embossed bonded sheet 10 is an index showing the number of single embossed protrusions 10ep contained per unit area of ​​the single embossed bonded sheet 10 (unit: pieces / cm 2 Since the single embossed convex portions 10ep are formed corresponding to the single embossed concave portions 10ed, their numbers, and therefore their density, have a 1:1 relationship.

[0136] The density of the embossed protrusions 10ep of the single embossed bonded sheet 10 can be determined by the following procedure. (1) Ten 8 cm x 8 cm areas are randomly selected on 30 kitchen towels, each 1 m long, from a kitchen towel roll of 100. (2) For the above 10 locations, the number of single embossed recesses 10ed of the single embossed binding sheet 10 within the above range is assumed to be the number of single embossed protrusions ep, and each is visually counted. At this time, only embosses that are entirely within the range are counted, and embosses that are only partially within the range are not counted. (3) The counted numbers for the above 10 locations are converted to per 1 cm × 1 cm to calculate the density of the single embossed convex portions 10ep of the single embossed bonding sheet 10. The average value calculated from the densities of the single embossed convex portions 10ep at the 10 locations is regarded as the density of the embossed convex portions 10ep of the single embossed bonding sheet 10.

[0137] As described above, referring to (c) of Figure 2, in the kitchen towel 30 according to an embodiment of the present invention, the single embossed bonded sheet 10 and the embossed sheet 20 are bonded via adhesive glue G interposed between the single embossed convex portion 10ep of the single embossed bonded sheet 10 and the embossed sheet 20.

[0138] Increasing the density of the single embossed protrusions 10ep of the single embossed bonded sheet 10 increases the number of adhesive contacts per unit area that contribute to the adhesion between the single embossed bonded sheet 10 and the embossed sheet 20. Increasing the number of adhesive contacts per unit area strengthens the adhesion between the sheets 10, 20, making it less likely that the single embossed bonded sheet 10 and the embossed sheet 20 will inadvertently peel off when wiping off dirt or the like with the kitchen towel 30.

[0139] At the contact points between the single embossed bonded sheet 10 and the embossed sheet 20, the surfaces of the single embossed bonded sheet 10 and the embossed sheet 20 (such as the top surfaces of the single embossed convex portions 10ep and the top surfaces of the embossed convex portions 20ep) are covered with the intervening adhesive glue G. In addition, a part of the adhesive glue G also partially penetrates into the sheets. In the regions of the sheets 10 and 20 to which the adhesive glue G is attached in this way, the presence of the adhesive glue G may inhibit water absorption or penetration.

[0140] If the density of the single embossed protrusions 10ep of the single embossed bonded sheet 10 becomes excessively high, the presence of the adhesive glue G increases the areas of the sheets 10, 20 where water absorption and moisture penetration are inhibited, which may reduce the water absorption rate of the kitchen towel 30. Therefore, in an embodiment of the present invention, there is an upper limit to the density of the single embossed protrusions 10ep of the single embossed bonded sheet 10 in order for the kitchen towel 30 to exhibit an excellent water absorption effect.

[0141] When the density of the single embossed convex portions 10ep of the single embossed bonded sheet 10 is low, the single embossed convex portions 10ep are sparsely present, reducing the number of adhesive contact points per unit area that contribute to the adhesion between the single embossed bonded sheet 10 and the embossed sheet 20. When the number of adhesive contact points per unit area becomes excessively small, the adhesion between the sheets 10, 20 becomes weak, and the single embossed bonded sheet 10 and the embossed sheet 20 are likely to peel off inadvertently when wiping off dirt and the like with the kitchen towel 30.

[0142] Furthermore, if the density of the single embossed protrusions 10ep of the single embossed bonded sheet 10 is excessively low, the single embossed protrusions 10ep are sparsely present, which may result in an excessively large gap between the single embossed bonded sheet 10 and the embossed sheet 20. In that case, the kitchen towel 30 may not be able to retain absorbed water in the gaps between the single embossed bonded sheet 10 and the embossed sheet 20, and may not be able to exhibit excellent water retention.

[0143] Therefore, in the embodiment of the present invention, there is a suitable range for the density of the single embossed projections 10ep (the density of the single embossed recesses 10ed) of the single embossed bonding sheet 10 that contributes to the adhesion between the single embossed bonding sheet 10 and the embossed sheet 20, and it is preferably within 3 pieces / cm. 2 More than 30 pieces / cm 2 The following is the result. EXAMPLES

[0144] (Examples 1 to 11) According to the above (example of the method for manufacturing a kitchen towel roll according to the embodiment of the present invention), a 3-ply kitchen towel roll according to the embodiment of the present invention shown in Tables 1 and 2 was manufactured. The embossing patterns of the single embossed bonded sheet and the embossed sheet were the same. At this time, the embossing density of the single embossed bonded sheet and the embossing density of the embossed sheet were each 8 pieces / cm. 2 It was decided.

[0145] (Comparative Examples 1 to 3) Three-ply kitchen towel rolls of Comparative Examples 1 to 3 shown in Table 2 were prepared.

[0146] All of Examples 1 to 11 (all Examples) and Comparative Examples 1 to 3 (all Comparative Examples) satisfied the following requirements (1) to (4). (1) A kitchen towel roll in which three sheets are laminated together and wound into a roll. (2) Two of the three sheets are laminated in a single embossed type laminated structure to form a single embossed bonded sheet having a single embossed recess on one side and a single embossed convex portion corresponding to the single embossed recess and a non-single embossed convex portion surrounding the single embossed convex portion on the other side. (3) The remaining sheet of the three sheets is an embossed sheet having an embossed depression on one side and an embossed protrusion corresponding to the embossed depression and a non-embossed protrusion surrounding the embossed protrusion on the other side. (4) The single embossed bonding sheet and the embossed sheet are laminated in a nested laminate structure in which the single embossed convex portion of the single embossed bonding sheet faces the non-embossed convex portion of the embossed sheet and the embossed convex portion of the embossed sheet faces the non-single embossed convex portion of the single embossed bonding sheet, and are bonded together via an adhesive glue interposed between the single embossed convex portion of the single embossed bonding sheet and the non-embossed convex portion of the embossed sheet.

[0147] The kitchen towel rolls of each Example and Comparative Example were subjected to the following measurements and evaluations. The measurements were performed by conditioning the samples in an environment conforming to the Japanese Industrial Standard JIS P8111 (temperature 23±1°C, humidity 50±2% RH).

[0148] <Measurement> [Reel length [m]] The roll length was calculated by multiplying the one-cut dimension, which is the distance between the tear perforations, by the number of cuts contained in the kitchen towel roll, and rounding off to two decimal places.

[0149] [Roll diameter [mm]] First, the circumference of the kitchen towel roll was measured at three positions, namely, both ends and the center in the axial direction of the kitchen towel roll, using a tape measure. Next, the measured circumference was divided by pi, 3.14, to calculate the roll diameter at each of the three positions, and the average value of the roll diameters at the three positions was calculated. The calculated average value was used as the roll diameter of the kitchen towel roll.

[0150] [Core diameter of paper tube [mm]] The outer diameter of the paper core of the kitchen towel roll was measured with a vernier caliper and rounded off to the nearest whole number.

[0151] [Kitchen towel roll winding density] The winding density of the kitchen towel roll was calculated according to the following formula (I): (Roll density) = (Roll length of kitchen towel × number of kitchen towel sheets) ÷ (Roll cross-sectional area) (I)

[0152] In all samples the ply number was 3, ie the number of sheets in the kitchen towel was 3.

[0153] The roll cross-sectional area is calculated by the following formula (II). (Roll cross-sectional area) = (Roll diameter DR ÷ 2) 2 × Pi - (Core diameter DC ÷ 2) 2 × Pi (II)

[0154] [Basis weight per sheet [g / m 2 ]〕 The kitchen towel (laminate sheet) was unwound from the kitchen towel roll, and the basis weight of the set of kitchen towels consisting of the three sheets that make up the kitchen towel and the adhesive glue interposed between them was measured in accordance with the provisions of Japanese Industrial Standard JIS P8124, and then this was divided by 3 to obtain the basis weight per sheet.

[0155] [Thickness of kitchen towel paper [μm]] The kitchen towel was unwound from the kitchen towel roll, and the thickness of the set of kitchen towels, consisting of the three sheets that make up the kitchen towel and the adhesive glue interposed between them, was measured in accordance with ISO 12625-3, except that the pressure applied between the pressure surfaces during the measurement was 2 kPa ± 0.2 kPa.

[0156] [Water absorption capacity of kitchen towels [g / m 2 ]〕 The water absorption [g / m2] per pair of kitchen towels (three-ply laminated sheet) was measured by the immersion method described with reference to FIG. 2 Specifically, the water absorption was determined according to the following steps (i) to (v). (i) A kitchen towel (laminate sheet) was cut into a size of 100 mm in width and 100 mm in length to prepare a test piece TP. The test piece TP was conditioned for 4 hours in an environment of a temperature of 23°C and a humidity of 50%, and then the mass of the test piece TP before immersion was measured. (ii) Pure water PW was poured into vat V to a depth of about 1 cm, and a hanger hanging stand HS was placed outside it. (iii) Clips C of hanger H were used to clamp two ends of the test piece TP, each about 1 mm apart. (iv) Then, the entire test piece TP, still clamped by the clip C of the hanger H, was immersed in the pure water PW in the vat V, and at the same time, the measurement of time was started with a stopwatch. (v) After one minute had elapsed since the test piece TP was immersed in the pure water PW, the hanger H was gently lifted to pull the test piece TP out of the pure water PW, and the hanger H was then lowered onto the hanging stand HS and left there for one minute. (vi) After being left for 1 minute, the test piece TP was removed from the hanger H, and the mass of the test piece TP in a wet state (hereinafter also referred to as the mass after immersion) was measured. The mass of the pure water PW held by the test piece TP (hereinafter also referred to as the mass of water) was calculated by subtracting the mass before immersion from the mass after immersion. (v) The mass of water is divided by the area of ​​the test piece TP to determine the water absorption amount [g / m 2 ] was requested.

[0157] <Result> The measurement results are shown in Tables 1 and 2.

[0158] [Table 1]

[0159] [Table 2]

[0160] In Comparative Example 1, the water absorption capacity of one kitchen towel (a three-ply laminated sheet) was 434 g / m 2 The highest water absorption rate (amount of water absorbed) was 0.285m / cm. 2 and the roll diameter was 130 mm, which was larger than the size of about 100 mm to 125 mm that can be accommodated in a typical kitchen towel roll holder and supported rotatably, and was therefore unsuitable.

[0161] In contrast, the winding density was higher than that of Comparative Example 1, at 0.30 m / cm2 ~0.90m / cm 2 In Examples 1 to 11, which are within the above range, the winding diameter is 113 mm to 120 mm, which is appropriate, and the water absorption is 238 g / m 2 ~391g / m 2 The water absorption (amount of water absorbed) was good.

[0162] The winding density is even higher than that of Examples 1 to 11, at 0.955 m / cm 2 , 1.031m / cm 2 In Comparative Examples 2 and 3, the winding diameters were 120 mm and 115 mm, respectively, which were appropriate, but the water absorption was 220 g / m 2 or less, and the water absorbency (amount of water absorbed) was low.

[0163] In this case, the paper thickness per set of kitchen towels (three-ply laminated sheets) in Examples 1 to 11 was 480 μm to 993 μm, which was higher than the paper thickness per set of kitchen towels in Comparative Examples 2 and 3, which were 289 μm and 305 μm.

[0164] In Examples 1 to 11, the winding density was lower than in Comparative Examples 2 and 3, so the embossing was less likely to be crushed. As a result, the paper thickness was thick and the embossed gaps were kept large, which is presumably why the paper had a high ability to retain water in the gaps within and between the sheets, and why the water absorption (water retention) was also good.

[0165] The scope of the present invention is not limited to the exemplary embodiments shown and described, but includes all embodiments that achieve equivalent effects to those intended by the present invention. Moreover, the scope of the present invention is not limited to the combination of inventive features defined by each claim, but may be defined by any desired combination of specific features among all the respective disclosed features. [Explanation of symbols]

[0166] 5 Paper tube 10 Single embossed bond sheet 10ed embossed recess (single embossed recess) 10ep embossed convex part (single embossed convex part) 10ned non-embossed recess (non-single embossed recess) 10nep Non-embossed convex part (non-single embossed convex part) 12 sheets 14 sheets 20 Embossed Sheet 20ed embossed recess 20ep embossed convex part 20ned non-embossed recess 20nep Non-embossed convex part 30 Kitchen towels 30m perforation for breaking 43 Nip roll (rubber roll) 44 Embossing roll (steel roll) 45 Embossing roll (steel roll) 46 Nip roll (rubber roll) 47 Marriage Roll 48 Fountain Roll 49 Transfer roll 50 applicator rolls 51 Group Pan 52 Dancer Roll 100 kitchen towel rolls TP test specimen C-Clip H Hanger HS Hanger Hanging Stand PW pure water V Bat

Claims

1. A kitchen towel roll in which a kitchen towel made of three laminated sheets is wound into a roll, Two of the three sheets are laminated in a single embossed laminate structure to form a single embossed bonded sheet having a single embossed concave portion on one side and a single embossed convex portion corresponding to the single embossed concave portion and a non-single embossed convex portion surrounding the single embossed convex portion on the other side; the remaining sheet of the three sheets is an embossed sheet having an embossed recess on one side and an embossed protrusion corresponding to the embossed recess and a non-embossed protrusion surrounding the embossed protrusion on the other side; the single embossed bonded sheet and the embossed sheet are laminated in a nested laminate structure in which the single embossed convex portion of the single embossed bonded sheet faces the non-embossed convex portion of the embossed sheet and the embossed convex portion of the embossed sheet faces the non-single embossed convex portion of the single embossed bonded sheet, and are bonded to each other via an adhesive glue interposed between the single embossed convex portion of the single embossed bonded sheet and the non-embossed convex portion of the embossed sheet, The winding density of the kitchen towel is 0.30 m / cm 2 0.90m / cm or more 2 is as follows: The winding density is expressed by the following formula: Roll density = (Roll length of kitchen towel × number of kitchen towel sheets) ÷ cross-sectional area of ​​roll A kitchen towel roll characterized by:

2. The kitchen towel has a roll length of 9.0 m or more and 35.0 m or less, and the three sheets have a basis weight of 14.0 g / m 2 30.0g / m or more 2 2. The kitchen towel roll of claim 1, wherein:

3. 3. The kitchen towel roll according to claim 1, wherein the thickness of the kitchen towel is 460 μm or more and 1000 μm or less.

4. 3. The kitchen towel roll according to claim 1, wherein the embossing pattern of the single embossed recess of the single embossed bonded sheet and the embossing pattern of the embossed recess of the embossed sheet are the same pattern.

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