Hand towel laminate and method of manufacturing same

Abstract

To provide a hand towel laminate having high water absorption properties, causing no wrinkles, and having excellent taking-out properties even when processing with an M / F machine.SOLUTION: A hand towel laminate is obtained by folding sheets one by one and laminating them so as to overlap each other. In the hand towel laminate 300, the sheets have a basis weight of 26.0 g / m2 or more and 34.0 g / m2 or less, a paper thickness of 0.85 mm / 10 ply or more and 1.20 mm / 10 ply or less, a dry machine-direction tensile strength (DMDT) of 20.6 N / 25 mm or more and 30.4 N / 25 mm or less, and a dry cross-direction tensile strength (DCDT) of 3.9 N / 25 mm or more and 8.3 N / 25 mm or less, and a D value measured by a TSA device is 1.2 mm / N or more and 2.4 mm / N or less.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a hand towel laminate and a method for making the same. [Background technology]

[0002] Paper hand towels are used in restrooms and washrooms to dry hands after washing them.They are also increasingly being used in various manufacturing sites for hygiene management purposes, such as for washing hands in food production, cooking, serving food, and in the production and packaging of hygienic products, and there is a demand for improved production capacity for hand towels with excellent absorbency.

[0003] Hand towels are sold and used as laminates in which the sheets are folded alternately and can be removed one after the other in a pop-up style. Such hand towel laminates are manufactured using an interfolder (I / F) processing machine or a multifolder (M / F; multi-stand interfolder) processing machine, which is a machine capable of high-speed mass production.

[0004] FIG. 1 is a perspective view illustrating a direction in which a sheet is taken out from a stack in an M / F processing machine.

[0005] When manufacturing using an M / F processing machine, as shown in FIG. 1 (see arrow D1), the sheet is taken out from the laminate in the CD (cross direction) rather than the MD (machine direction).

[0006] For example, Patent Document 1 discloses a sheet folding equipment in which a continuous sheet is supplied onto a sheet stack transported on a conveyor belt line, and a number of folding machines are installed at intervals along the line, each folding machine feeding two sheets so that the sides of the two sheets are wrapped around the other sheets in an approximately C-shape, the conveyor belt line having a transport force imparting device that pinches the sheets between upper and lower belts and imparts a transport force at a number of positions between the groups of folding machines, and no feeding force imparting device is installed at a number of other positions, and a pair of nip rolls is provided at a number of other positions where no feeding force imparting device is installed, which nip the entire width of the sheet stack on the lower belt together with the lower belt, and the upper roll of the pair of nip rolls is driven to rotate at a peripheral speed approximately the same as the transport speed, and the lower roll is driven to rotate at a peripheral speed approximately the same as the transport speed or rotates freely. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 3968368 Summary of the Invention [Problem to be solved by the invention]

[0008] However, when processing is performed using the above-mentioned M / F processing machine, it is superior to interfolder (I / F) processing machines and the like in that high-speed production is possible. However, as shown in Figure 1, when the sheet is made into a laminate, the removal direction of the sheet is the CD direction rather than the MD direction, which means that the sheet strength is low and it is prone to breakage, resulting in a problem of poor removal ability.

[0009] In addition, hand towels are thicker than tissue paper and have a large difference in the folding length between the inside and outside. Also, due to the characteristics of dry crepe paper used in hand towels, etc., it has low elongation in the CD direction and high rigidity. Therefore, it is difficult to absorb the difference in the folding length in the CD direction, and wrinkles are likely to occur.

[0010] Furthermore, in the technology described in Patent Document 1, the number of folding machines corresponding to the number of sets of stacks is arranged in sequence from the upstream to the downstream of the conveying line, and there is a problem that quality variations in water absorbency and the like occur between the stacked sheets. After studying this problem in detail, the present inventors thought that the following may be the cause.

[0011] For example, a sheet sent from a folding machine arranged on the upstream side of the conveying line is crushed multiple times by multiple nip rolls arranged on the conveying line until it is conveyed to the final point of the conveying line. That is, such a sheet is crushed by more nip rolls, so the paper thickness becomes thinner. On the other hand, a sheet sent from a folding machine arranged on the downstream side of the conveying line is crushed only by nip rolls arranged downstream of the folding machine, so the paper thickness does not become so thin. In this way, the number of times the sheet is crushed by the nip rolls varies between clips, so it is considered that the above-mentioned variation in water absorbency occurs between sheets. Normally, it is important that hand towels have excellent water absorbency, and in order to increase water absorbency, the paper thickness is often designed to be thick, but it is considered that the occurrence of such variation in paper thickness has a negative effect on water absorbency as a result.

[0012] Furthermore, when the number of nip rolls and pull belts in the M / F processing machine is increased, the processing speed of the M / F processing machine does not increase, resulting in a problem of poor production efficiency. Also, when an attempt is made to increase the vertical strength of the sheet so that it can withstand high-speed processing, the paper becomes stiff, causing problems such as a deterioration in hand feel (wiping comfort, usability).

[0013] Thus, in a hand towel laminate produced by a commonly used M / F processing machine, it is difficult to maintain excellent ease of removal without wrinkles while avoiding a significant drop in production efficiency caused by the M / F processing machine.

[0014] The present invention has been made in consideration of the above circumstances, and has an object to provide a hand towel laminate that is highly absorbent, wrinkle-free, and easy to remove, even when processed using an M / F processing machine, and a method for manufacturing a hand towel laminate. [Means for solving the problem]

[0015] As a result of intensive research by the inventors in order to achieve the above-mentioned object, the present inventors have discovered a hand towel laminate in which sheets are folded one by one and laminated so as to overlap each other, and the sheets have a basis weight of 26.0 g / m 2 More than 34.0g / m 2 The inventors have gained the discovery that a hand towel laminate having a paper thickness of 0.85 mm / 10 plies or more and 1.20 mm / 10 plies or less, a dry machine direction tensile strength (DMDT) of 20.6 N / 25 mm or more and 30.4 N / 25 mm or less, a dry cross direction tensile strength (DCDT) of 3.9 N / 25 mm or more and 8.3 N / 25 mm or less, and a D value measured by a TSA device of 1.2 mm / N or more and 2.4 mm / N or less, has thus completed the present invention.

[0016] That is, the present invention is as follows.

[0017] (1) A hand towel laminate in which sheets are folded one by one and stacked so that they overlap each other, said sheets having a basis weight of 26.0 g / m 2 More than 34.0g / m 2 the paper thickness is 0.85 mm / 10 plies or more and 1.20 mm / 10 plies or less, the dry machine direction tensile strength (DMDT) is 20.6 N / 25 mm or more and 30.4 N / 25 mm or less, the dry cross direction tensile strength (DCDT) is 3.9 N / 25 mm or more and 8.3 N / 25 mm or less, and the D value measured by a TSA device is 1.2 mm / N or more and 2.4 mm / N or less. (2) The specific volume of the sheet is 2.8 cm 3 / g or more 4.0cm 3 / g or less. (3) The hand towel laminate according to (1) or (2), wherein the ratio (DMDT / DCDT) of the dry machine direction tensile strength (DMDT) to the dry cross direction tensile strength (DCDT) of the sheet is 3.5 or more and 5.7 or less. (4) The hand towel laminate according to any one of (1) to (3), wherein the number of pairs in the hand towel laminate is 80 or more and 200 or less. (5) A method for producing a hand towel laminate as set forth in any one of (1) to (4), comprising: a lamination step of folding the sheets one by one by a folding section of a multi-folder folder while transporting the sheets by a conveyor, and laminating the sheets so that they overlap each other to obtain an uncompressed laminate; and a compression step of compressing the uncompressed laminate by a compression processing section to obtain the hand towel laminate, wherein the compression processing section is disposed downstream of the conveyor from the folding section and includes pull belts disposed above and below the conveyor, and the compression step comprises a step of compressing the uncompressed laminate by passing it between the pull belts disposed above and below the conveyor after all of the sheets constituting the hand towel laminate have been laminated. (6) The method for producing a hand towel laminate according to (5) above, wherein the compression processing section is provided alone and is disposed downstream of the folding section. (7) The method for producing a hand towel laminate according to (5) or (6), wherein the folding section includes a plurality of folding plate devices and at least one touch roll disposed above the conveyor between at least one of the adjacent folding plate devices, and the laminating step supports the sheet transported by the conveyor from above with the touch roll. (8) The method for producing a hand towel laminate according to (7) above, wherein the touch roll is a roughly cylindrical metal roll body having a diameter of 10 mm or more and 50 mm or less, a mass of 100 g or more and 1000 g or less, and is freely rotatable in the conveying direction of the conveyor. Effect of the Invention

[0018] The present invention provides a hand towel laminate that is highly absorbent, wrinkle-free, and easy to remove, even when processed using an M / F processing machine, and a method for manufacturing a hand towel laminate. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 is a perspective view illustrating a direction in which a sheet is taken out from a stack in an M / F processing machine. [Diagram 2] FIG. 2 is a conceptual diagram showing an example of a machine winder that can be used in the manufacturing method according to the present embodiment. [Diagram 3] FIG. 3 is a conceptual diagram showing the configuration of a folding section of an M / F processing machine that can be used in the manufacturing method according to this embodiment. [Figure 4] FIG. 4 is a perspective view of a folding plate device constituting the folding section of FIG. [Diagram 5] FIG. 5 is a schematic diagram illustrating an example of compression processing performed by a pull unit. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, an embodiment for carrying out the present invention (hereinafter, simply referred to as "the present embodiment") will be described in detail. The present embodiment is an example for explaining the present invention, and is not intended to limit the present invention to the following content. The present invention can be carried out by appropriately modifying it within the scope of its gist.

[0021] In the drawings, the same elements are given the same reference numerals, and duplicated explanations are omitted. Furthermore, unless otherwise specified, the positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings. Furthermore, the dimensional ratios of the drawings are not limited to the ratios shown in the drawings.

[0022] Furthermore, in this specification, any term with "abbreviation" indicates the meaning of the term excluding "abbreviation" within the scope of common technical knowledge of a person skilled in the art, and includes the meaning itself excluding "abbreviation."

[0023] <Hand towel laminate>

[0024] The hand towel laminate according to this embodiment is a hand towel laminate in which sheets are folded one by one and laminated so as to overlap each other. The sheets have a basis weight of 26.0 g / m 2 More than 34.0g / m 2 the paper thickness is 0.85mm / 10 plies or more and 1.20mm / 10 plies or less, the dry machine direction tensile strength (DMDT) is 20.6N / 25mm or more and 30.4N / 25mm or less, the dry cross direction tensile strength (DCDT) is 3.9N / 25mm or more and 8.3N / 25mm or less, and the D value measured by a TSA device is 1.2mm / N or more and 2.4mm / N or less.

[0025] As described below, the hand towel laminate according to this embodiment is made by folding a single sheet and stacking the sheets one on top of the other (see FIG. 1). The hand towel laminate according to this embodiment can be taken out one by one in succession in a pop-up style.

[0026] In this specification, the machine direction refers to the direction in which the hand towel flows when it is made, i.e., the machine direction (MD), and the cross direction refers to the direction perpendicular to the machine direction, i.e., the cross direction (CD).

[0027] The raw material of the sheet may be 100% by mass of pulp, or may contain recycled paper raw materials. For example, recycled milk carton raw materials (MSF) may be used. When MSF is used, the blending rate is preferably 50% by mass or less.

[0028] The sheet weight is 26.0 g / m 2 More than 34.0g / m 2 Preferably, it is 28.0 g / m or less. 2 More than 32.0g / m 2 The basis weight can be measured in accordance with JIS P 8124.

[0029] The thickness of the sheet is 0.85 mm / 10 plies or more and 1.20 mm / 10 plies or less. Preferably, it is 0.90 mm / 10 plies or more and 1.10 mm / 10 plies or less. The thickness can be measured under the conditions of JIS P 8111 (23±1° C., 50±2% relative humidity) using a thickness gauge (for example, Ozaki Seisakusho's upright dial thickness gauge "PEACOCK R1-B type") with a pressure of 3.7 kPa applied to the gauge.

[0030] By setting the basis weight and paper thickness within the above ranges, a hand towel having high water absorbency, excellent usability, and good ease of removal can be obtained.

[0031] The dry machine direction tensile strength (DMDT) of the sheet is 20.6 N / 25 mm or more and 30.4 N / 25 mm or less, and preferably 22.6 N / 25 mm or more and 28.4 N / 25 mm or less. The DMDT can be measured based on the tensile test method of JIS P 8113.

[0032] The dry cross tensile strength (DCDT) of the sheet is 3.9 N / 25 mm or more and 8.3 N / 25 mm or less, preferably 4.8 N / 25 mm or more and 7.4 N / 25 mm or less. DCDT can be measured based on the tensile test method of JIS P 8113.

[0033] By setting the tensile strength in the longitudinal and transverse directions within the above ranges, a hand towel with a good feel and excellent usability can be obtained, and when processed using an M / F processing machine, the generation of wrinkles is reduced, allowing for processing with high production efficiency.

[0034] The D value of the sheet measured by a tissue softness analyzer (TSA device) is 1.2 mm / N or more and 2.4 mm / N or less, and preferably 1.5 mm / N or more and 2.1 mm / N or less. This D value refers to the measured value of stiffness (D) expressed as the amount of deformation displacement of the sample in the up and down direction between a pressing pressure of 100 mN and 600 mN when a hand towel sample placed on the sample stage of the TSA device is pressed from above with a pressing pressure of 100 mN and 600 mN, respectively, without rotating the bladed rotor.

[0035] By setting the D value within the above range, a hand towel with appropriate rigidity, a good feel, and excellent usability can be obtained, and when processed using an M / F processing machine, the generation of wrinkles is reduced.

[0036] The specific volume of the sheet is 2.8 cm 3 / g or more 4.0cm 3 / g or less. More preferably, it is 3.0 cm 3 / g or more 3.7cm 3 / g or less, and more preferably 3.2 cm 3 / g or more 3.4cm 3 / g or less. This specific volume is calculated from the values ​​of basis weight and paper thickness (paper thickness (mm / 10 ply) ÷ basis weight (g / m 2 By setting the specific volume within the above range, a hand towel having high water absorbency and excellent usability can be obtained.

[0037] The ratio of the tensile strength in the machine direction when dry to the tensile strength in the machine direction when dry (machine strength / machine strength; DMDT / DCDT) is preferably 3.5 to 5.7, more preferably 4.0 to 5.0. By keeping the machine strength / machine strength ratio within the above range, the hand towel can be processed efficiently with less wrinkles when processed using an M / F processing machine, and has a good feel and excellent usability.

[0038] The length of the sheet (the length parallel to the pulling direction) is not particularly limited, but is preferably 200 mm to 240 mm. The width of the sheet (the length perpendicular to the pulling direction) is not particularly limited, but is preferably 180 mm to 220 mm. By setting the sheet length and width within the above ranges, a hand towel that is easy to use for wiping moisture off hands and has an excellent feel when used is obtained.

[0039] The number of sets of the hand towel laminate is preferably 80 sets or more and 200 sets or less. More preferably, it is 100 sets or more, and even more preferably, it is 130 sets or more. If it is 80 sets or more, the frequency of replacing the carton or film pack can be reduced, further improving the feeling of use. If it is 200 sets or less, the weight of one box or one pack is not too heavy, and there is no inconvenience in carrying it when purchasing or using it. The number of sets can be changed as appropriate depending on the size of the carton or film in which the hand towels are stored.

[0040] The packaging form of the hand towel laminate according to this embodiment is not particularly limited, and may be appropriately selected from, for example, cartons, film packaging (gusset packaging, pillow packaging, etc.), etc. Furthermore, the shape of the outlet when the hand towel laminate is made to be continuously removable in a pop-up manner is also not limited. For example, when the hand towel laminate is made into a carton, a window film may or may not be provided.

[0041] <Method of Manufacturing Hand Towel Laminate>

[0042] The hand towel laminate according to the present embodiment described above can be produced, for example, by the following manufacturing method.

[0043] The method for producing the hand towel laminate according to this embodiment includes (1) a stacking step in which the sheets are folded one by one by a folding section of a multi-folder folder while being transported by a conveyor, and stacked so that they overlap each other to obtain an uncompressed laminate, and (2) a compression step in which the uncompressed laminate is compressed by a compression processing section to obtain the hand towel laminate. The compression processing section is preferably located downstream of the conveyor from the folding section and includes pull belts located above and below the conveyor, and the compression step is preferably a step in which, after all of the sheets that make up the hand towel laminate have been stacked, the uncompressed laminate is compressed by passing it between the pull belts located above and below.

[0044] (Paper making process)

[0045] The sheets constituting the hand towel laminate can be obtained by papermaking using a papermaking machine. It is usually preferable to control the water flow rate / wire speed (J / W ratio) during papermaking to be in the range of 0.85 to 1.00.

[0046] For hand towels, wet strength is important, so it is preferable to add a wet strength agent (e.g., polyamine-polyamide epichlorohydrin type) to the paper stock slurry. It is also preferable to add a dry strength agent to increase dry strength.

[0047] In order to impart softness, bulkiness, and water absorbency to the sheet, it is preferable to perform a crepe treatment. Crepe treatment is a method of mechanically compressing a sheet in the MD direction to form wavy wrinkles called "crepes", which can further improve the bulkiness (bulk feeling), softness, water absorbency, surface smoothness, aesthetic appearance (crepe shape), elongation, etc. For example, a drying process is performed after papermaking, and in the drying process, crepes are formed when the sheet is peeled off from the Yankee dryer by a creping doctor, and the crepe can be maintained by the difference in reel speed (the reel speed is slower than that of the Yankee dryer).

[0048] (Transportation process)

[0049] The sheets constituting the hand towel laminate are then transported to the next process using a crane or a forklift, or may be transported along a line by a conveyer.

[0050] (Calendar processing process)

[0051] FIG. 2 is a conceptual diagram showing an example of a machine winder that can be used in the manufacturing method according to the present embodiment.

[0052] The sheet obtained in the papermaking process is preferably subjected to a calendering process. Calendering can be performed, for example, by a machine winder 10 shown in FIG. 2. In this machine winder 10, a reel 11 wound in a reel part is set in the machine winder 10 to become a raw cloth roll 14. At this time, calendering is performed on two stages, in the calendering machine 12 for the first stack and then the calendering machine 13 for the second stack (see arrow D2). Of course, calendering may be performed in only one stage, either in the calendering machine 12 for the first stack or the calendering machine 13 for the second stack. Calendering can also be performed using an on-machine calender.

[0053] Although not shown, embossing may be applied to the raw roll 14. When embossing is applied, it is preferable to carry out a calendar treatment before carrying out the embossing.

[0054] (Lamination process)

[0055] FIG. 3 is a conceptual diagram showing the configuration of a folding section of an M / F processing machine that can be used in the manufacturing method according to this embodiment, and FIG. 4 is a perspective view of a folding plate device that constitutes the folding section of FIG.

[0056] First, in the lamination process, the sheets 100 are folded one by one so that they overlap each other. The folding form of the sheets 100 is not particularly limited as long as the sheets 100 can be taken out one by one in a pop-up manner, and can be, for example, a V-fold or a Z-fold. The folding of the sheets 100 can be performed by an M / F processing machine. The number of sets of the sheets 100 can be variously folded by devising the number of folding plate devices 20a, 20b, 20c, etc., arranged in the folding section 20 described later.

[0057] The number of sets is not particularly limited, but is preferably 80 to 200 sets. More preferably, it is 100 sets or more, and even more preferably, it is 130 sets or more. If it is 80 sets or more, the frequency of replacing the carton or film pack can be reduced, and the usability is further improved. If it is 200 sets or less, the weight of one box or one pack is not too heavy, and there is no inconvenience in carrying it when purchasing or using it.

[0058] For convenience, only three folding plate devices 20a, 20b, and 20c are shown in FIG. 3, but the folding section 20 of the M / F processing machine includes multiple folding plate devices 20a, 20b, and 20c, etc., arranged on the conveying line. That is, each of the folding plate devices 20a, 20b, and 20c, etc., alternately folds the sheet 100 (sometimes called a "web") to form a set of folded laminates. For example, if the number of sets of hand towel laminates is 200, 200 sets of sheets 100 will be laminated, and the number of folding plate devices 20a, 20b, and 20c, etc., may be the same as the number of sets, 200, arranged on the conveying line.

[0059] Next, folding in one folding plate device 20a will be described. As shown in Fig. 4, in the folding plate device 20a, a plurality of sheets 100 cut to the product width are introduced, and the unwinding direction is changed by a first guide roll 21, and then the sheets 100 are oriented by a second guide roll 22 so that a set of sheets 100 contact each other, and finally, the sheets are guided by a folding plate 23 and folded together to form an uncompressed laminate 200, which is a long folded laminate (sometimes called a "laminate bundle" or the like).

[0060] Furthermore, according to this embodiment, the folding section 20 is provided with at least one touch roll 24 arranged above the conveyor 30, at least in one between adjacent folding plate devices 20a, 20b, 20c, etc., and in the stacking process, it is preferable that the sheet transported by the conveyor 30 (for example, in Figures 3 and 4, the uncompressed laminate 200) is supported from above by the touch roll 24.

[0061] Unlike pinch rolls and nip rolls that actively press and feed the transported object (e.g., the sheet 100 or the uncompressed laminate 200, etc.), the touch roll 24 is a roll that supports the transported object by its own weight without applying pressure. In this embodiment, the sheets 100 are not compressed as much as possible until all the sets of sheets 100 are laminated (i.e., until the lamination process by the folding section 20 is completed), so that the variation in physical properties such as the paper thickness, water absorbency, and touch of the sheets 100 can be suppressed. From this viewpoint, it is preferable to use the touch roll 24 in this embodiment. This allows the sheets 100 to be guided on the conveyor 30 with high stability without being compressed individually.

[0062] 3, one touch roll 24 is disposed between folding plate device 20a and folding plate device 20b, one touch roll 24 is disposed between folding plate device 20b and folding plate device 20c, and a touch roll 24 is further disposed downstream of folding plate device 20c. However, in this embodiment, it is not necessary to provide a touch roll 24 between all adjacent folding plate devices, and it is preferable to provide a touch roll 24 between at least one of them.

[0063] Each of the touch rolls 24 is a roll body made of metal in a generally cylindrical shape, and the diameter is preferably 10 mm or more and 50 mm or less. When the touch roll 24 is made of metal, the type of metal is not limited, and examples thereof include aluminum, steel, and iron. The mass of each of the touch rolls 24 is preferably 100 g or more and 1000 g or less. By using such dimensions and shapes, the touch roll 24 can guide the sheet 100 with high stability by its own weight alone.

[0064] It is preferable that the touch roll 24 is freely rotatable in the conveying direction of the conveyor 30 (the conveying direction of the uncompressed laminate 200, see arrow D3). By rotating freely in this way, it is possible to synchronize with the conveying speed without generating unintended resistance or pressure during conveying, so that it is possible to guide the sheets 100 on the conveyor 30 with as little compression as possible until all the sets of sheets 100 are laminated (i.e., until the lamination process in the folding section 20 is completed).

[0065] The M / F processing machine can be configured to include multiple (e.g., three or more) PR (parent roll) stands in front of the folding unit 20, and to pay out the web from the PR stands to the folding unit 20. In addition, the configuration of the M / F processing machine may be appropriately modified within the range in which the effect of this embodiment can be obtained.

[0066] In this manner, a set of stacks folded by one folding plate device 20a is folded so as to interlock with a set of stacks on the next folding plate device 20b disposed downstream on the conveyor 30. Subsequently, a stack folded by the further next folding plate device 20c is folded so as to interlock with the set of stacks. In this manner, stacks folded by folding plate devices (not shown) disposed on the conveyor 30 are successively interlocked in sequence to obtain an uncompressed stack 200.

[0067] (Compression process)

[0068] FIG. 5 is a schematic diagram illustrating an example of compression processing performed by a pull unit.

[0069] Next, the compression step and the compression processing unit that performs the compression step will be described with reference to Fig. 5. As the compression processing unit, for example, a pull unit (sometimes called a "pull belt") 40 can be used. In the compression step, the uncompressed laminate 200 can be compressed by passing it between an upper pull unit 41 and a lower pull unit 42 that are arranged above and below the laminate.

[0070] Uncompressed laminate 200 (laminate bundle) is loaded into pull unit 40 and compressed in the lamination direction by upper pull unit 41 and lower pull unit 42 to obtain a compressed laminate bundle. This is then cut to product length (longitudinal length of the hand towel) by a cut-off saw, log saw, or the like to obtain hand towel laminate 300 (sometimes called a "clip," etc.).

[0071] The pull unit 40 has multiple sets of rolls (upper pull units 41 and lower pull units 42) arranged on the top and bottom. A belt such as a rubber belt is stretched between these upper and lower roll sets, and the upper and lower belts run at a predetermined speed (see arrows D4 and D5) by rotating rolls 45 and 46 with driving rolls 43 and 44, and the uncompressed laminate 200 is transported between the two belts and compressed there.

[0072] It is preferable that only one compression processing section is disposed downstream of the folding section 20. Specifically, it is preferable that the pull unit 40 is disposed downstream of the most downstream folding plate device (not shown) of the M / F processing machine. In this case, the pull unit 40 only needs to be disposed downstream of the most downstream folding plate device, and the number of pull units disposed is not particularly limited, but it is more preferable that there is only one. By controlling the placement conditions of the pull unit 40 in this manner, all of the sheets constituting the hand towel laminate 300 are compressed with the same compression force and number of compressions, so there is no variation in paper thickness among the sheets 100, and as a result, variation in physical properties such as water absorbency can also be suppressed.

[0073] Although not shown, the obtained hand towel laminate 300 can be boxed and packaged by a subsequent cartoner or packaging machine, etc., to form a final product.

[0074] As described above, according to this embodiment, even when processed by an M / F processing machine, it is possible to produce hand towel laminate 300 that has high water absorbency, is wrinkle-free, and has excellent removal properties. Furthermore, depending on the embodiment, by controlling the physical properties of hand towel laminate 300, such as basis weight, paper thickness, tensile strength in the longitudinal direction when dry, tensile strength in the lateral direction when dry, and D value measured by a TSA device, as well as the number of plies, it is possible to obtain a hand towel laminate that meets the required characteristics at a practical level without providing a pull belt or nip roll between the folders of the M / F processing machine, and it is also possible to produce a high-quality hand towel laminate with little quality difference between the laminated sheets.

[0075] In addition, the commonly used manufacturing method for the hand towel laminate 300 is a processing method using an M / F processing machine, which has a high processing speed, but even when the processing speed is set high to maintain high production efficiency, according to this embodiment, in order to withstand that processing speed, the dry longitudinal tensile strength (DMDT) of sheet 100 is set high, while the dry transverse tensile strength (DCDT) is set low (i.e., the DMDT / DCDT ratio is increased), thereby further improving the hand feel (e.g., wiping comfort and usability, etc.). EXAMPLES

[0076] The present invention will be described in more detail with reference to the following examples and comparative examples, but the present invention is not limited to the following examples in any way.

[0077] <Preparation of Hand Towel Laminate>

[0078] Example 1 Using a manufacturing device having the configuration shown in Figures 2, 3, 4, and 5, a single sheet was folded and laminated so as to overlap each other to produce hand towel laminate 300. Specifically, for folding section 20 in Figures 4 and 5, 120 folding plate devices 20a, 20b, 20c, etc. were arranged on a line, and 40, 60, and 100 sets of touch rolls 24 (steel, diameter: 20 mm, mass: 700 g) having a substantially cylindrical shape were arranged on the line at three locations so as to touch the assembled clips. Specifically, first, paper was made under conditions of 70% by mass of pulp and 30% by mass of MSF to obtain sheet 100. Next, the obtained sheet 100 was subjected to a calendaring process to keep the paper thickness within a specified range. Next, a lamination process and a compression process were performed using an M / F processing machine. Then, the laminated hand towels 300 (sheet length 220 mm, sheet width 198 mm) having 120 sets was obtained by cutting with a log saw.

[0079] (Examples 2 to 7, Comparative Examples 1 to 4) A hand towel laminate was obtained in the same manner as in Example 1, except that the conditions were changed as shown in each table.

[0080] <Evaluation method>

[0081] (Basic weight) The basis weight was measured in accordance with JIS P 8124.

[0082] (paper thickness) The paper thickness was measured under the conditions of JIS P 8111 (23±1°C, 50±2% relative humidity) using a thickness gauge (e.g., Ozaki Seisakusho's upright dial thickness gauge "PEACOCK R1-B type") with a pressure of 3.7 kPa applied to the gauge.

[0083] (specific volume) The specific volume was calculated from the basis weight and paper thickness.

[0084] (Tensile strength) · Dry longitudinal tensile strength of sheet (DCDT) DCDT was measured for 1 ply based on the tensile test method of JIS P 8113 ("Strength - Vertical" in the table). Dry tensile strength of sheet in cross direction (DCDT DCDT was measured for 1 ply based on the tensile test method of JIS P 8113 ("Strength - Transverse" in the table). The ratio of the dry tensile strength of the sheet in the machine direction to the dry tensile strength in the cross direction (machine direction strength / cross direction strength; DMDT / DCDT) The values ​​were calculated based on the measured values ​​of DCDT and DMDT mentioned above ("Intensity vs. aspect ratio" in the table). These measurements were performed under the conditions specified in JIS P 8111 (23±1° C., 50±2% relative humidity).

[0085] (D value measured by TSA device) A hand towel sample was placed on the sample stage of a tissue softness measuring device (TSA; "Tissue Softness Analyzer" manufactured by emtec) and pressed from above with a pressing pressure of 100 mN and 600 mN without rotating the bladed rotor. The measured stiffness (D) was expressed as the amount of deformation displacement of the sample in the vertical direction between pressing pressures of 100 mN and 600 mN, respectively.

[0086] (Evaluation of water absorbency (TWA; Total Water Absorbency)) The water absorbency (TWA) was measured by first cutting the obtained hand towel into a square test piece of 76 x 76 mm and measuring the dry mass (W1). After that, the test piece was immersed in distilled water for 2 minutes, and then one corner of the test piece was placed at the top, and the top and two adjacent corners were supported and hung in an extended state (RH 100%), and the mass (W2) was measured after leaving it for 30 minutes. The value of (W2-W1) was then calculated, and this value was converted to the water absorbency (TWA) per 1 g of hand towel.

[0087] (Evaluation of usability) The hand towel laminate was used to dry hands after washing, and a sensory evaluation was conducted on the usability of the laminate by 60 people. Each person rated the usability on a scale of 1 to 5 based on the following criteria, and the overall usability was evaluated according to the following criteria. (judgment criteria) 4 points or more and 5 points or less: When used for wiping hands, the material felt soft and had a particularly good feel to the touch. 3 points or more and less than 4 points: When used for wiping hands, the material felt soft and had a good feel to the touch. Less than 3 points: When used for wiping hands, it did not feel soft and felt rough to the touch. (comprehensive evaluation) "◎": The average score of 60 reviewers was 4.0 or higher. "Good": The average score of the 60 reviewers was between 3.0 and 4.0 points. "X": The average score of the 60 evaluations was less than 3.0 points.

[0088] (Evaluation of processability) A sheet was removed from the obtained hand towel laminate, and the state of wrinkles and creases was evaluated for processability according to the following criteria. "Excellent": The creases were firmly set, and wrinkles were observed in less than 10% of the total number of sheets. "○": The creases were firmly formed, and wrinkles were observed in 10% or more and less than 20% of the total number of sets. "X": Sheets in which the crease was not properly formed and wrinkles occurred were confirmed in 20% or more of the total number of sets.

[0089] Table 1 shows the conditions and evaluation results of each example, and Table 2 shows the conditions and evaluation results of each comparative example.

[0090] [Table 1]

[0091] [Table 2]

[0092] From the above, it was at least confirmed that according to this example, even when processed using an M / F processing machine, a hand towel laminate with high water absorbency, no wrinkles, and excellent removal properties can be obtained. [Explanation of symbols]

[0093] 10: Machine winder, 11: Reel, 12,13: Calendar machine, 14: Raw material roll, 20: Folding section, 20a, 20b, 20c: folding plate device; 21: first guide roll, 22: second guide roll, 23: Folding plate, 24: Touch roll, 30: Conveyor, 40: Pull unit (pull belt), 41: Upper pull unit, 42: Lower pull unit, 43, 44: driving roll, 45, 46: Roll, 100: sheet, 200: uncompressed laminate, 300: Hand towel laminate, C, D1, D2, D3, D4, D5: Arrows, S1, S2: Seat

Claims

1. The hand towel laminate is made by folding the sheets one by one and stacking them on top of each other, The sheet is Basis weight: 26.0 g / m ２ 34.0g / m or more ２ is as follows: The paper thickness is 0.85 mm / 10 plies or more and 1.20 mm / 10 plies or less, The dry machine direction tensile strength (DMDT) is 22.6 N / 25 mm or more and 28.4 N / 25 mm or less; The dry cross tensile strength (DCDT) is 3.9 N / 25 mm or more and 8.3 N / 25 mm or less; The D value measured by the TSA device is 1.5 mm / N or more and 2.1 mm / N or less. Hand towel laminate.

2. The specific volume of the sheet is 2.8 cm ３ / g or more 4.0cm ３ / g or less, The hand towel laminate of claim 1 .

3. The ratio (DMDT / DCDT) of the dry tensile strength in the machine direction (DMDT) to the dry tensile strength in the cross direction (DCDT) of the sheet is 3.5 or more and 5.7 or less; The hand towel laminate of claim 1 or 2.

4. The number of pairs of the hand towel laminate is 80 pairs or more and 200 pairs or less. The hand towel laminate according to any one of claims 1 to 3.

5. A method for producing the hand towel laminate according to any one of claims 1 to 4, a stacking step of folding the sheets one by one by a folding unit of a multi-folder folder while conveying the sheets by a conveyor, and stacking the sheets so as to overlap each other to obtain an uncompressed stack; a compression step of compressing the uncompressed laminate by a compression processing section to obtain the hand towel laminate; Including, The compression processing unit is disposed downstream of the conveyor from the folding unit, and includes pull belts disposed above and below the conveyor, The compressing step includes a step of compressing the uncompressed laminate by passing the uncompressed laminate between the pull belts disposed above and below the pull belts after all of the sheets constituting the hand towel laminate have been laminated, The compression processing section is disposed downstream of the folding section, The folding section includes: a plurality of folding plate assemblies; At least one touch roll is disposed above the conveyor between at least one of the adjacent folding plate devices; The touch roll supports the transported object by its own weight, The lamination step includes supporting the sheet transported by the conveyor from above with the touch roll. A method for producing a hand towel laminate.

6. the touch roll is a metal roll body having a substantially cylindrical shape, a diameter of 10 mm or more and 50 mm or less, a mass of 100 g or more and 1000 g or less, and is freely rotatable in the conveying direction of the conveyor; A method for producing the hand towel laminate according to claim 5.

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