JP7594452B2 - Filmless storage box with hand towel - Google Patents

Description

The present invention relates to a filmless storage box containing hand towels.

Paper hand towels are used in various forms, such as pop-up types inserted into storage boxes. These paper hand towels are used to wipe away moisture from wet objects, so they need to have a higher water absorption capacity than tissue. For this reason, they are designed to have a high basis weight.

However, paper with a high basis weight is generally stiff and feels bad when it touches the skin when wiping, so it is not preferred. For this reason, attempts have been made to adjust the paper quality by lowering the basis weight of each sheet of hand towel base paper to reduce the stiffness, and by using two plies to increase water absorbency.

In recent years, technology has also been developed for high-speed processing of hand towels using multi-stand interfolders.

Some storage boxes for packing the laminated hand towels have a film affixed around the opening to prevent dust and other foreign matter from getting into the hand towels. However, given the recent trend toward reducing environmental impact, storage boxes with filmless openings (filmless storage boxes) are preferred.

For example, Patent Document 1 discloses a film packaging body in which the packaged item is sanitary paper folded in a pop-up style, and paper hand towels or the like can be used as the sanitary paper.

JP 2016-188092 A

However, in commonly used interfolder products, the hand towel is taken out in the MD (Machine Direction), whereas in this multi-stand interfolder product, the hand towel is taken out in the CD (Cross Direction). Therefore, when a two-ply hand towel is processed in a multi-stand interfolder and taken out in the CD, the basis weight of each sheet of paper is low and the transverse strength (strength in the CD) of each sheet of paper is weak, resulting in a problem that the hand towel is more likely to tear when taken out than in an interfolder product where the hand towel is taken out in the MD.

In addition, in a product in which a hand towel laminate, such as that described above, made by processing two-ply hand towels using a multi-stand type interfolder, is packed into a storage box with a filmless opening (a filmless storage box containing hand towels), if the opening is made larger to reduce the likelihood of the towels tearing when removed, the hand towels will easily drop back due to their own weight when removed.

In addition, if a hand towel with a low basis weight is used to prevent tearing or drop back when the hand towel is removed, problems will occur such as the hand towel not being able to absorb enough water when in use.

As described above, in a filmless storage box containing hand towels, in which two-ply hand towels are processed in a multi-stand type interfolder and the removal direction is in the CD direction, it is difficult to achieve at a practical level that the hand towels are easy to remove without tearing, that there is no drop back, and that the hand towels are highly absorbent.

The present invention was made in consideration of the above-mentioned circumstances, and aims to provide a filmless storage box containing hand towels that allows the hand towels to be easily removed without tearing, reduces the risk of drop back when removed, and provides high water absorption for the hand towels.

In order to achieve the above-mentioned objective, the inventors have thoroughly investigated the causes of the above-mentioned problems that occur when a product is made by filling a storage box with a filmless opening with a two-ply hand towel laminate processed by a multi-stand type interfolder. As a result, they have concluded that the following may be one of the causes.

When hand towels are processed using a multi-stand interfolder, the direction in which they are taken out of the storage box is the CD direction of the hand towels, and so the stiffness of the hand towels is weak in the vertical direction (i.e., the direction perpendicular to the take-out opening, which corresponds to the CD direction of the hand towels). As a result, when a hand towel is taken out of the storage box, the next hand towel that should emerge from the take-out opening cannot stand upright in the direction of the take-out, making it difficult to take out. Furthermore, we thought that the hand towel would fall into the filmless take-out opening under its own weight, causing a drop back.

The inventors have made repeated improvements based on this idea, and as a result, have discovered a filmless storage box containing hand towels, in which a hand towel laminate, in which paper hand towels are folded so that two plies overlap each other, is stored in a storage box with a filmless removal opening, the removal direction of the hand towels is the CD (Cross Direction) direction of the hand towels, and the basis weight of the hand towels is 14.9 g/m2 ^{or more} and 17.9 g/m2 or less. The present invention has been completed based on the ^findings that a filmless storage box containing hand towels has a paper thickness of 0.55 mm/10 plies or more and 0.71 mm/10 plies or less, a dry lateral strength of the hand towels of 2.9 N/25 mm or more and 6.7 N/25 mm or less, a ratio (a/x x 100) of the longitudinal length (a) of the removal opening to the longitudinal length (x) of the storage box is 61.7% or more and 92.5% or less, and a ratio (W/x x 100) of the lateral sheet length (W) of the hand towels to the longitudinal length (x) of the storage box is 88.1% or more and 98.1% or less.

In other words, the present invention is as follows.

[1]
A filmless storage box containing hand towels, the filmless storage box having a filmless take-out opening, contains a hand towel laminate in which two plies of paper hand towels are folded so that they overlap each other, the take-out direction of the hand towels is a CD (Cross Direction) direction of the hand towels, and the basis weight of the hand towels is 14.9 g/m2 or more and 17.9 g/m2 or ^less . ² or less, the paper thickness of the hand towels is 0.55 mm/10 plies or more and 0.71 mm/10 plies or less, the dry lateral strength of the hand towels is 2.9 N/25 mm or more and 6.7 N/25 mm or less, the ratio (a/x x 100) of the longitudinal length (a) of the removal opening to the longitudinal length (x) of the storage box is 61.7% or more and 92.5% or less, and the ratio (W/x x 100) of the lateral sheet length (W) of the hand towels to the longitudinal length (x) of the storage box is 88.1% or more and 98.1% or less.
[2]
The filmless storage box containing hand towels described in [1] has a ratio (b/y x 100) of the short-side length (b) of the outlet to the short-side length (y) of the storage box, which is 22.7% or more and 56.4% or less.
[3]
The filmless storage box containing hand towels described in [1] or [2] has a sheet length (L) in the vertical direction when the set of hand towels is unfolded, and a length (y) in the short direction of the storage box that satisfies the following relationship.
81.8%≦(L/2)/y×100≦96.1%
[4]
The filmless storage box containing hand towels according to any one of [1] to [3], wherein the dry machine direction tensile strength (DMDT) of the hand towels is 12.7 N/25 mm or more and 17.3 N/25 mm or less.
[5]
The filmless storage box containing hand towels according to any one of [1] to [4], wherein when a bladed rotor is pressed from above against a two-ply sample of the hand towel placed on a sample stage using a tissue softness measuring device TSA with a pressing pressure of 100 mN and then rotated at a rotation speed of 2.0 (/sec), and the vibration of the sample stage is measured with a vibration sensor, the intensity of the maximum peak of the first spectrum from the low frequency side (TS750), which is automatically obtained by software on the tissue softness measuring device TSA, is 19.1 ^dBV2 rms or more and 27.3 ^dBV2 rms or less.
[6]
The filmless storage box containing hand towels according to any one of [1] to [5], wherein the height of the storage box is 30 mm or more and 65 mm or less.
[7]
The filmless storage box containing hand towels is described in any one of [1] to [6], wherein the length (x) of the storage box in the longitudinal direction is 200 mm or more and 260 mm or less, and the length (y) of the storage box in the short direction is 95 mm or more and 125 mm or less.
[8]
The filmless storage box containing hand towels according to any one of [1] to [7], wherein the resistance to removal of the hand towels from the storage box is 0.3 N or more and 1.4 N or less for the 3rd set to the 30th set from the bottom.
[9]
The filmless storage box containing hand towels according to any one of [1] to [8], wherein the resistance to removal of the hand towels from the storage box is 0.9 N or more and 2.7 N or less for the third set to the fifteenth set from the top.

The present invention provides a filmless storage box containing hand towels that allows the hand towels to be easily removed without tearing, reduces drop back when removed, and provides high water absorption for the hand towels.

FIG. 1 is a perspective view of a filmless storage box containing hand towels according to a first embodiment. FIG. 2 is a plan view of the hand towel of the present embodiment in an unfolded state. FIG. 3 is a top view of the filmless storage box containing hand towels according to the first embodiment. FIG. 4 is a top view of a filmless storage box containing hand towels according to the second embodiment. FIG. 5 is a top view of a filmless storage box containing hand towels according to the third embodiment. FIG. 6 is a top view of a filmless storage box containing hand towels according to the fourth embodiment. FIG. 7 is a conceptual diagram for explaining a method for measuring the extraction resistance. FIG. 8 is a perspective view of a conventional filmless storage box containing hand towels, which is manufactured by the interfolder process.

The following describes in detail the form for carrying out the present invention (hereinafter, simply referred to as the "present embodiment"). The following 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 with appropriate modifications within the scope of its gist.

In addition, in the drawings, the same elements are given the same reference numerals, and duplicate 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.

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."

Figure 1 is a perspective view of a filmless storage box containing hand towels according to the first embodiment, Figure 2 is a plan view of the hand towels of this embodiment in an unfolded state, and Figure 3 is a top view of the filmless storage box containing hand towels according to the first embodiment.

The filmless storage box 1 containing hand towels according to the first embodiment is a filmless storage box 1 containing hand towels, in which a hand towel laminate, in which paper hand towels 10 are folded so that two plies overlap each other, is stored in a storage box 20 (filmless storage box) having a filmless removal opening 21, in which the removal direction of hand towels 10 (arrow F) is the CD direction of hand towels 10, and the basis weight of hand towels 10 is 14.9 g/m2 or more and 17.9 g/m2 or ^less . ² or less, the paper thickness of hand towel 10 is 0.55 mm/10 plies or more and 0.71 mm/10 plies or less, the dry lateral strength of hand towel 10 is 2.9 N/25 mm or more and 6.7 N/25 mm or less, the ratio (a/x x 100) of the longitudinal length (a) of removal opening 21 to the longitudinal length (x) of storage box 20 is 61.7% or more and 92.5% or less, and the ratio (W/x x 100) of the lateral sheet length (W) of hand towel 10 to the longitudinal length (x) of storage box 20 is 88.1% or more and 98.1% or less.

In the filmless storage box 1 containing hand towels, the hand towel laminate is loaded into the filmless storage box 20 so that the removal direction (arrow F) of the hand towels 10 is the CD direction of the hand towels 10. The hand towel laminate is loaded into the storage box 20 in this positional relationship when, for example, a hand towel laminate in which paper hand towels 10 are folded by multi-stand interfolder processing so that two plies overlap each other is stored in the storage box 20 with the removal opening 21 being filmless. The CD direction is the direction perpendicular to the flow direction (MD direction; machine direction) of the hand towels 10 during manufacturing.

To aid in understanding, we will now explain the differences between the filmless storage box 1 containing hand towels according to this embodiment (see FIG. 1) and a conventional filmless storage box 100 containing hand towels (see FIG. 8) manufactured by interfolder processing.

Figure 8 is a perspective view of a conventional filmless storage box containing hand towels, manufactured using the interfolder process.

In the filmless storage box 100 containing hand towels shown in FIG. 8, the hand towels 200 are manufactured by interfolder processing, so the removal direction (arrow F) of the hand towels 200 from the removal opening 310 of the storage box 300 is the MD direction. However, the filmless storage box 1 containing hand towels 10 of this embodiment is different in that the hand towels 10 are manufactured by multi-stand type interfolder processing, so the removal direction (arrow F) of the hand towels 10 is the CD direction.

In other words, multi-stand interfolder processing has the advantage of being able to process at high speeds, but because the direction in which the hand towel 10 is taken out (arrow F) is the CD direction, in the case of a two-ply hand towel, the basis weight of each sheet of paper is low and the transverse strength (strength in the CD direction) tends to be weak, meaning that it is more likely to tear than a one-ply hand towel, which has a high basis weight.

Furthermore, there is room for improvement in the ease of removing the hand towels 10. In particular, when first starting to use the hand towels 10 stored in the storage box 20 (for example, up to the 15th set from the top of the removal opening 21), the hand towels 10 tend to be difficult to remove due to high frictional resistance between the hand towels 10 and the film-less removal opening 21.

There is also room for improvement in preventing the drop-back of the storage box 20 when the hand towels 10 are removed. In particular, when attempting to use up all the hand towels 10 stored in the storage box 20 (for example, up to the 30th set from the bottom of the removal opening 21), the distance from the removal opening 21 to the remaining clips becomes longer, making drop-back more likely to occur.

However, with the filmless storage box 1 containing hand towels according to this embodiment, such problems do not occur, and even in a product in which hand towels 10 are processed using a multi-stand type interfolder and then packed into a storage box 20, the hand towels 10 are easy to remove without tearing, drop back is unlikely to occur when removed, and furthermore, the hand towels 10 have high water absorbency.

The hand towel 10 and storage box 20 of this embodiment are described below.

(Hand towel)

The hand towels 10 are folded, for example, in a roughly V-shape, two on top of one another to form a hand towel laminate. In other words, the number of plies is two. This hand towel laminate is stored in a storage box 20.

In this embodiment, the horizontal direction of the hand towel 10 (see symbol W) is the MD direction of the hand towel 10. The vertical direction of the hand towel (see symbol L) is the CD direction of the hand towel 10, which is the removal direction of the hand towel 10 (see arrow F in Figures 1 and 2). The vertical sheet length (L) of the hand towel 10 shown in Figure 2 is the vertical length of the hand towel 10 when it is unfolded from the folded state in the hand towel laminate.

The basis weight of the hand towel 10 is 14.9 g/m ² or more and 17.9 g/m ² or less, and preferably 16.0 g/m ² or more and 17.5 g/m ² or less. The basis weight can be measured in accordance with JIS P 8124.

The paper thickness of the hand towel 10 is 0.55 mm/10 plies or more and 0.71 mm/10 plies or less. Preferably, it is 0.59 mm/10 plies or more and 0.67 mm/10 plies or less. The paper 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.

By setting the basis weight and paper thickness within the above ranges, the hand towel 10 can be more easily removed from the storage box 20 without tearing, drop back is less likely to occur when the hand towel 10 is removed, and the water absorbency of the hand towel 10 can be made even higher.

The dry lateral tensile strength (DCDT, dry lateral strength) of the hand towel 10 is 2.9 N/25 mm or more and 6.7 N/25 mm or less. Preferably, it is 3.8 N/25 mm or more and 5.9 N/25 mm or less. By keeping the dry lateral strength within the above range, the hand towel 10 is less likely to tear when removed from the storage box 20, and drop back during removal can be effectively prevented.

The dry longitudinal tensile strength (DMDT, dry longitudinal strength) of the hand towel 10 is preferably 12.7 N/25 mm or more and 17.3 N/25 mm or less, and more preferably 13.8 N/25 mm or more and 16.2 N/25 mm or less. By keeping the dry longitudinal strength within the above range, the towel feels appropriately soft when used for hand wiping, and drop back when removed can be effectively prevented.

Dry lateral strength and dry longitudinal strength can each be measured based on the tensile test method of JIS P 8113.

When a two-ply sample of hand towel 10 placed on a sample stage is pressed from above with a bladed rotor at a pressing pressure of 100 mN and then rotated at a rotation speed of 2.0 (/sec) using a tissue softness measuring device TSA, and the vibration of the sample stage is measured with a vibration sensor, the intensity of the maximum peak of the first spectrum from the low frequency side (TS750), automatically acquired by software on the tissue softness measuring device TSA, is preferably 19.1 ^dBV2 rms or more and 27.3 dBV2 ^rms or less, more preferably 21.2 ^dBV2 rms or more and 25.4 ^dBV2 rms or less. By setting the TS750 value within the above range, it is possible to control the friction between adjacent hand towels, which makes it easier to remove hand towel 10 from storage box 20 without tearing it, and more effectively prevents dropback when removed.

Here, we will explain the Tissue Softness Measuring Device TSA. The Tissue Softness Measuring Device TSA quantitatively evaluates the softness (feel of touch) of paper by analyzing vibration data detected by various sensors when a rotating bladed rotor is pressed against a paper sample, and parameterizing it (TS value). This is the product name of Emtec Electronic GmbH of Germany (Japan distributor is Sanyo Trading Co., Ltd.).

The software that performs vibration analysis and parameterization (TS value) uses the emtec measurement system. This software is equipped with various algorithms (e.g., Base Tissue, Facial, TP, etc.), and TS7, TS750, and D (rigidity) are automatically obtained on the software, and the HF (hand feel) value is calculated from TS7, TS750, D, basis weight, thickness, number of plies, etc., depending on the type of algorithm. In this embodiment, TS750 is used, and any algorithm can be used as long as the above measurement conditions are met, and the value of TS750 does not change depending on the type of algorithm.

In addition, as a preferred embodiment of the present invention, the lower limit of the TWA (Total Water Absorbency) of the hand towel 10 is 80 g/m ² or more, more preferably 100 g/m ² or more, and even more preferably 105 g/m ² or more. In addition, the upper limit of the TWA is not particularly limited in this embodiment, but may be, for example, 140 g/m ² or less. According to the filmless storage box 1 containing a hand towel of this embodiment, the hand towel 10 can be easily taken out of the storage box 20 without breaking, and while satisfying the advantages of being unlikely to cause drop back when taken out, the hand towel 10 can be made to have sufficient water absorption to this extent. As a result, for example, when wiping off moisture after hand washing, the amount of moisture absorption per hand towel can be increased, and the number of hand towels 10 used can be reduced. Note that the TWA can be measured in accordance with the method described in the examples described below.

The material of the hand towel 10 contains pulp as a main component, and preferably contains 50% or more by mass of pulp. Examples of pulp include wood pulp, recycled paper pulp, and non-wood pulp. The hand towel 10 may be made of 100% wood pulp as pulp, or may contain recycled paper pulp and non-wood pulp in addition to wood pulp. The wood pulp is preferably softwood bleached kraft pulp (NBKP) or hardwood bleached kraft pulp (LBKP). The recycled paper pulp is preferably derived from paper liquid beverage containers such as milk cartons. In addition to pulp, the hand towel 10 may contain fillers, synthetic fibers, natural fibers, and the like.

Specifically, the wood pulp preferably contains 20% to 50% by mass of softwood bleached kraft pulp (NBKP) and 50% to 80% by mass of hardwood bleached kraft pulp (LBKP), more preferably 25% to 45% by mass of NBKP and 55% to 75% by mass of LBKP, and even more preferably 30% to 40% by mass of NBKP and 60% to 70% by mass of LBKP.

In addition, up to about 50 parts by mass of recycled paper pulp may be included for every 100 parts by mass of wood pulp with the above pulp ratio. The quality of recycled paper pulp varies widely, and increasing the blend ratio significantly affects the quality of the product, especially the softness, so the blend amount relative to the wood pulp is preferably 30 parts by mass or less, more preferably 15 parts by mass or less, even more preferably 5 parts by mass or less, and even more preferably no recycled paper pulp is blended.

In order to ensure the appropriate strength of the hand towel 10, the raw materials can be mixed by normal means, and then the strength can be adjusted by beating the pulp fibers. For the beating process to obtain the target quality, the freeness (csf) of the seed box raw material is 350 mL to 650 mL, preferably 400 mL to 600 mL, and more preferably 450 mL to 550 mL. A dry strength enhancer may be used, and a wet strength enhancer is preferably used.

(Storage box)

The storage box 20 is, for example, a roughly rectangular parallelepiped storage box made of paper, and is sometimes called a carton or the like. The storage box 20 has a filmless removal opening 21 on its top surface, from which the hand towels 10 can be removed (pulled out). Note that, although the storage box 20 will be described later, in this embodiment, the dimensions and shape of the removal opening 21 and the like are not particularly limited, and it is sufficient that the hand towels 10 can be removed. The dimensions and shape of the storage box 20 and the removal opening 21 can be appropriately set to suitable dimensions and shapes taking into account the dimensions and shapes and applications of the hand towels 10, as long as they are within a range that satisfies the conditions of this embodiment. Note that the dimensions and shape of the storage box 20 described below are external dimensions unless otherwise specified.

The ratio (a/x x 100) of the longitudinal length (a) of the removal opening 21 to the longitudinal length (x) of the storage box 20 is 61.7% or more and 92.5% or less. Preferably, it is 72.5% or more and 88.7% or less. This ratio can be used as an indicator of the longitudinal opening rate of the removal opening 21. By keeping this ratio within the above range, the hand towel 10 can be easily removed from the storage box 20 without tearing, and drop back is less likely to occur when removing the hand towel 10.

The ratio (W/x x 100) of the horizontal sheet length (W) of the hand towel 10 to the longitudinal length (x) of the storage box 20 is 88.1% or more and 98.1% or less. Preferably, it is 91.6% or more and 97.3% or less. By keeping this ratio within the above range, the hand towel 10 can be easily removed from the storage box 20 without tearing, and drop back is less likely to occur when the hand towel 10 is removed.

The ratio (b/y x 100) of the length (b) of the short side of the opening 21 to the length (y) of the short side of the storage box 20 is preferably 22.7% or more and 56.4% or less, and more preferably 32.6% or more and 48.1% or less. This ratio can be used as an indicator of the opening rate of the opening 21 in the short side. By setting this ratio in the above range, the hand towel 10 can be more easily removed from the storage box 20 without tearing, and drop back is less likely to occur when removing the hand towel 10. Furthermore, it is more preferable that both the opening rate in the long side (see a/x x 100) and the opening rate in the short side (see b/y x 100) are in the above range.

It is preferable that the longitudinal sheet length (L) of one set of hand towels (i.e., two plies) when unfolded, and the transverse length (y) of storage box 20 satisfy the following relational expression (1), and more preferably, relational expression (2). This L/2 corresponds to the longitudinal length of hand towel 10 when folded in half, for example. And, (L/2)/y×100 corresponds to the ratio (%) of (L/2) to y.
81.8%≦(L/2)/y×100≦96.1%...(1)
86.4%≦(L/2)/y×100≦93.3%...(2)
By setting this ratio within the above range, hand towel 10 can be more easily removed from storage box 20 without tearing, and drop back is less likely to occur when hand towel 10 is removed.

The length (x) of the storage box 20 in the longitudinal direction is preferably 200 mm or more and 260 mm or less, more preferably 211 mm or more and 244 mm or less. The length (y) of the storage box 20 in the transverse direction is preferably 95 mm or more and 125 mm or less, more preferably 102 mm or more and 118 mm or less. In this embodiment, it is more preferable that both the length of the storage box 20 in the longitudinal direction and the length of the transverse direction satisfy the above range. This length (x) in the longitudinal direction corresponds to the carton size in the longitudinal direction, and this length (y) in the transverse direction corresponds to the carton size in the transverse direction. By setting the size of the storage box 20 within the above range, and setting the opening rate of the removal opening 21 in the longitudinal direction and the transverse direction, and the ratio of the length of the hand towel 10 within the above range, the hand towel 10 can be more easily removed from the storage box 20 without tearing, and drop back is less likely to occur when removing the hand towel 10.

The height (h) of the storage box 20 is preferably 30 mm or more and 65 mm or less, and more preferably 37 mm or more and 55 mm or less. By setting the height of the storage box 20 within the above range, the hand towels 10 can be more easily removed and drop back during removal can be more effectively prevented. This height (h) is sometimes called the carton height, etc.

The length (a) of the opening 21 of the storage box 20 in the longitudinal direction can be set to an appropriate length taking into account the above-mentioned dimensional and shape conditions, but is preferably 140 mm or more and 210 mm or less, particularly taking into account the relative ratio to the length (x) of the storage box 20.

The length (b) of the short side of the access opening 21 of the storage box 20 can be set to an appropriate length taking into account the above-mentioned dimensional and shape conditions, but is preferably 25 mm or more and 62 mm or less, particularly taking into account the relative ratio to the length (y) of the short side of the storage box 20.

Furthermore, the dimensions and shape of the hand towel 10 (e.g., the horizontal sheet length and vertical sheet length) can be appropriately determined in consideration of the conditions of the dimensions and shape of the storage box 20 and its removal opening 21. The dimensions of the hand towel 10 can also be adapted to match the dimensions and material of the storage box 20.

From this perspective, the sheet length (W) of the hand towel in the horizontal direction (corresponding to the MD direction) is preferably 200 mm or more and 240 mm or less, and more preferably 208 mm or more and 228 mm or less. By setting the length in this manner, the ease of removal is improved and the size is suitable for use in hand wiping. This sheet length (W) corresponds to the sheet size in the horizontal direction.

Furthermore, the sheet length (L) in the longitudinal direction (corresponding to the CD direction) of the hand towel 10 is preferably 180 mm or more and 220 mm or less, and more preferably 190 mm or more and 208 mm or less. This length improves ease of removal and provides a suitable size for use in wiping hands. This sheet length (L) corresponds to the sheet size in the longitudinal direction. Furthermore, L/2 corresponds to the sheet size when the hand towel 10 is folded into 2 plies.

The resistance to removing the hand towels 10 from the storage box 20 (the resistance when pulling out the hand towels 10 from the storage box 20) is preferably 0.9 N or more and 2.7 N or less for the 3rd to 15th sets from the top, and more preferably 1.3 N or more and 2.1 N or less.

The resistance to removing the hand towels 10 from the storage box 20 (the resistance when pulling out the hand towels 10 from the storage box 20) is preferably 0.3 N or more and 1.4 N or less for the 3rd set from the bottom to the 30th set, and more preferably 0.5 N or more and 1.0 N or less.

Here, the removal resistance from the third set to the fifteenth set from the top corresponds to the resistance at the beginning of use of the filmless storage box 1 containing the hand towels, and the removal resistance from the third set to the 30th set from the bottom corresponds to the resistance at the end of use of the filmless storage box 1 containing the hand towels. If the resistance at the beginning of use is high, the hand towels 10 are difficult to remove, and may tear when removed. Also, if the resistance at the end of use is low, drop back is more likely to occur. In this regard, by controlling the resistance at the beginning of use and the resistance at the end of use as described above, the hand towels 10 can be more easily pulled out without tearing at the beginning of use, and drop back that tends to occur at the end of use can be more effectively prevented. In addition, the first set to the second set from the top have different folds and wrinkles compared to the third set and onwards, and the removal resistance value may vary greatly, and tends not to be an average value suitable as an index of resistance at the beginning of use. Therefore, in this embodiment, attention is focused on the removal resistance from the third set to the 30th set from the top. In addition, for the first and second sets from the bottom, there are no subsequent hand towels 10 following from below, so the resistance to removal may vary significantly compared to the third set onwards, and it tends not to be possible to obtain an average value suitable as an indicator of resistance at the end of use. Therefore, in this embodiment, the focus is on the resistance to removal from the third set to the 30th set from the bottom.

The resistance to removing the hand towel 10 from the storage box 20 described above can be measured by the following measurement method.

Figure 7 is a conceptual diagram to explain how to measure the removal resistance.

First, prepare six filmless storage boxes 1 containing hand towels, each containing a hand towel laminate stored in the storage box 20. From one box, take two pieces of paper 20a (12 mm in the MD direction, 20 mm in the CD direction) from the storage box 20. Gently take out and remove the first two pieces of hand towels 10 from one of the remaining five boxes.

Next, the third set from the top is placed in the center of the sheet widthwise direction, with the inner surface of the storage box 20 touching the hand towels 10, as shown in FIG. 7, and the upper edge of the hand towels 10 is clamped by the paper piece 20a of the storage box 20. A clip C (for example, a product name "TANOSEE double clip, small opening width 19 mm" manufactured by Otsuka Shokai) is used to clamp the paper piece 20a of the storage box 20 from above. The size of the clip C is 11 mm high and 19 mm wide, and the length of the paper piece 20a of the storage box 20 is 12 mm and the width is 20 mm. Note that the size of the clip C and the size of the paper piece 20a are not limited to these.

Then, while the hand towels 10 are clamped in this manner, a Tensilon tensile tester is used to pull the hand towels 10 at a pulling speed of 1000 mm/min, and the maximum resistance value applied until the hand towels 10 are pulled out of the storage box 20 is measured. Similarly, measurements are made for the fourth through fifteenth sets, and the third through thirtieth sets from the bottom, and the average value of each is taken as the removal resistance. Similar measurements are made for the remaining four boxes, and the average value of the five boxes is taken as the removal resistance.

It is preferable that the topmost sheet (the first set on the top) is folded along the sheet width. By folding the sheet, it is less likely to tear when pulling out the first set.

The number (number of pairs) of hand towels 10 stored in storage box 20 is preferably 60 pairs or more and 140 pairs or less, and more preferably 80 pairs or more and 120 pairs or less. The number of pairs can be appropriately determined, for example, taking into consideration the height of storage box 20. By setting the number of pairs within the above range, hand towels 10 can be more easily removed from storage box 20 without tearing, and drop back when removed can be more unlikely to occur.

The weight of the storage box 20 is preferably 20 g or more and 55 g or less. This weight is more preferably 30 g or more and 45 g or less. The weight of the storage box 20 can be determined appropriately depending on the basis weight, paper thickness, size, number of pieces, etc. of the hand towels to be stored.

The shape of the outlet 21 is not particularly limited as long as it is within the range in which the effects of this embodiment can be obtained, and a suitable shape can be selected taking into consideration the dimensions and shape of the hand towels 10 to be stored, the number of sets, etc. In this case, the longitudinal length (a) of the outlet 21 refers to the longest distance from one end to the other end in a direction parallel to the longitudinal direction (see symbol x) of the storage box 20 when viewed from above. And the lateral length (b) of the outlet 21 refers to the longest distance from one end to the other end in a direction parallel to the lateral direction (see symbol y) of the storage box 20 when viewed from above.

Below, we will show modified shapes of the removal opening 21 and explain the relationship between the longitudinal length of the removal opening (a), the lateral length of the removal opening (b), the longitudinal length of the storage box (x), and the lateral length of the storage box (y).

Figure 4 is a top view of a filmless storage box containing hand towels according to the second embodiment.

In the filmless storage box 2 containing hand towels according to the second embodiment, a long and narrow opening is arranged along the longitudinal direction (see symbol x) as the removal opening 31 of the storage box 30, and a substantially circular opening is formed in the center. In this case, the longitudinal length (a) of the removal opening 31 is the longest distance in the longitudinal direction of the removal opening 31. Also, the lateral length (b) of the removal opening 31 is the longest distance in the lateral direction of the removal opening 31.

Figure 5 is a top view of a filmless storage box containing hand towels according to the third embodiment.

The filmless storage box 3 containing hand towels according to the third embodiment has an elongated opening arranged along the longitudinal direction (see symbol x) as the removal opening 41 of the storage box 40, with approximately circular openings formed at both ends. In this case, the longitudinal length (a) of the removal opening 41 is the longest distance in the longitudinal direction of the removal opening 41. Also, the lateral length (b) of the removal opening 41 is the longest distance in the lateral direction of the removal opening 41.

Figure 6 is a top view of a filmless storage box containing hand towels according to the fourth embodiment.

In the filmless storage box 4 containing hand towels according to the fourth embodiment, a long and narrow opening is arranged on a substantially diagonal line of the top surface of the storage box 50 as the removal opening 51 when viewed from above. In this case, the longitudinal length (a) of the removal opening 51 is the longest distance in the longitudinal direction of the removal opening 51. Also, the lateral length (b) of the removal opening 51 is the longest distance in the lateral direction of the removal opening 51.

＜Manufacturing method＞

The above-mentioned hand towels 10 can be obtained, for example, by making paper using a papermaking machine, and then subjecting the paper to a calendaring process or the like as necessary. The paper may also be embossed. A multi-stand interfolder processing machine is then used to fold the hand towels 10 so that they overlap each other, and compress them as necessary, to obtain a hand towel laminate. The hand towel laminate thus obtained is then packaged and stored in storage boxes 20, 30, 40, 50 using a cartoner, packaging machine, or the like, to obtain filmless storage boxes 1, 2, 3, 4 containing hand towels.

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 these examples in any way.

<Example 1>

First, a process for manufacturing paper hand towels 10 was carried out using the materials shown in Table 1 using a papermaking machine to produce rectangular paper hand towels 10 as shown in Figure 2, which have the physical properties and dimensions shown in Table 1. Next, the obtained hand towels 10 were laminated by multi-stand interfolder processing, with two plies folded alternately into a roughly V-shape, to obtain a hand towel laminate (120 sets of hand towels). The materials for hand towels 10 were 35% by mass NBKP, 60% by mass LBKP, and 5% by mass recycled paper pulp.

(Making filmless storage box 1 with hand towels)

The obtained hand towel laminate was placed in a paper storage box 20 as shown in Figures 1 and 3 to produce a filmless storage box 1 containing hand towels, having the physical properties and dimensions and shape shown in Table 1. Unless otherwise specified, the dimensions and shape in the table are external dimensions.

<Examples 2-9, Comparative Examples 1-6>

A hand towel, a hand towel laminate, and a filmless storage box containing hand towels were produced in the same manner as in Example 1, except for the changes made to the conditions described in Tables 1 and 2.

<Measurement of physical properties>

The various physical properties of each Example and Comparative Example were measured according to the following methods.

(grammage)

The basis weight of the hand towels was measured in accordance with JIS P 8124.

(paper thickness)

The thickness of the hand towel 10 was measured under the conditions of JIS P 8111 (23±1°C, 50±2% relative humidity) using a thickness gauge (Ozaki Manufacturing Co., Ltd.'s upright dial thickness gauge "PEACOCK R1-B type") with a pressure of 3.7 kPa applied to the gauge.

(Dry longitudinal strength (DMDT), dry transverse strength (DCDT))

The tensile strength in the vertical direction when dry (dry vertical strength, DMDT) and the tensile strength in the horizontal direction when dry (dry horizontal strength, DCDT) of the hand towel 10 were each measured based on the tensile test method of JIS P 8113.

(TSA TS750)

Using the tissue softness measuring device TSA, a two-ply sample of hand towel placed on a sample stage was pressed from above with a bladed rotor at a pressure of 100 mN, then rotated at a rotation speed of 2.0 (/sec). The vibration of the sample stage was measured with a vibration sensor. The intensity of the maximum peak of the first spectrum from the low frequency side (TS750) was automatically obtained by the software on the tissue softness measuring device TSA. The TSA device manufactured by Emtec Electronic GmbH of Germany (distributor in Japan is Sanyo Trading Co., Ltd.) mentioned above was used.

(Extraction resistance value)

The "top 3-15th set" of hand towels 10 refers to the resistance to removal of the 3rd to 15th sets of hand towels 10 from the top stored in storage box 20 (resistance when removing hand towels 10 from storage box 20). The "bottom 3-30th set" of hand towels 10 refers to the resistance to removal of the 3rd to 30th sets of hand towels 10 from the bottom stored in storage box 20 (resistance when removing hand towels 10 from storage box 20). These removal resistances were measured in accordance with the measurement method described above, based on the method for measuring removal resistance shown in FIG. 7. Then, as described below, the removal resistance was measured according to the conditions of each example and each comparative example.

The direction in which the hand towel 10 was removed (see arrow F in FIG. 1) was the CD direction of the hand towel 10, which was the vertical direction of the hand towel 10 (see symbol L in FIG. 2).

Unless otherwise specified, measurements and evaluations in this example were performed after maintaining the sample in equilibrium under the temperature and humidity conditions specified in JIS P 8111 (23±1°C, 50±2% RH).

＜Evaluation＞

A sensory evaluation was conducted on the filmless storage boxes containing hand towels from each Example and Comparative Example as follows.

(Evaluation of the ease of removing the hand towel without tearing it)

The ease of removing hand towels was evaluated when removing the first set to the 15th set of hand towels stored in a storage box (i.e., removing the first set directly under the removal opening through the 15th set in sequence). Specifically, 50 subjects were asked to rate the ease of removing hand towels on a scale of 1 to 5 based on the following criteria.
・5 points: When removing the hand towel from the storage box, it was easy to remove without tearing it.
4 points: When removing the hand towel from the storage box, it was possible to remove it smoothly without tearing it.
・3 points: The hand towels were not torn when I took them out of the storage box, but they were difficult to pull out.
1 to 2 points: The hand towels were difficult to remove from the storage box, and one or more pairs were torn.
The arithmetic average of the scores of the 50 people was then taken and an overall rating was given using the following criteria: "x", "good", or "good".
"Excellent": The average score of the 50 panelists was 4.0 points or higher.
"○": The average score of the 50 panelists was 3.0 or more and less than 4.0 points.
"X": The average score of the 50 panelists was less than 3.0 points.

(Dropback evaluation)

When the first through 30th pairs of hand towels were taken out from the end of the storage box (i.e., 30 pairs were taken out in succession after use), the number of pairs that dropped back out of the 30 pairs was counted. For example, "0" in the table indicates that 30 pairs were taken out, but none were dropped back (0 pairs).

(Evaluation of water absorption)

TWA was measured as an index of water absorption performance. First, the hand towel was cut into a square test piece of 76 x 76 mm, and its dry mass (W1) was measured. Then, the test piece was immersed in distilled water for 2 minutes, and then one corner of the test piece was made to be the top of the upper side, and the top and two adjacent corners were supported and hung in an extended state (RH 100%), and the mass (W2) after leaving for 30 minutes was measured. Then, the value of (W2-W1) was calculated, and this value was converted to TWA (g/ ^m2 ) per 1 ^m2 of hand towel.

The conditions and evaluation results for each example and comparative example are shown in Tables 1 and 2.

From the above, it has been confirmed that the filmless storage box containing hand towels of this embodiment allows hand towels to be easily removed without tearing, reduces drop back that occurs when removing the hand towels, and furthermore, the hand towels have high water absorbency.

1, 2, 3, 4: Filmless storage box with hand towel,
10: Hand towels,
20, 30, 40, 50: storage box,
20a: Piece of paper from a storage box;
21, 31, 41, 51: outlet,
C: Clip,
F: take-out direction,
W: Horizontal sheet length of the hand towel (MD direction),
L: Length of the hand towel sheet in the vertical direction (CD direction = removal direction),
x: longitudinal length of the storage box (horizontal direction),
y: length of the short side of the storage box (vertical direction),
h: Height of the storage box,
a: Length of the outlet in the longitudinal direction (horizontal direction),
b: The length of the short side of the outlet (vertical direction),
100: (conventional) filmless storage box with hand towel,
200: (conventional) hand towel,
300: (conventional) storage box,
310: Access hole (of conventional storage box)

Claims (8)

a filmless storage box containing hand towels, the filmless storage box storing a hand towel laminate in which two plies of paper hand towels are folded so as to overlap each other, the hand towel laminate being stored in the storage box having a filmless opening;
The hand towel is taken out in a cross direction (CD) of the hand towel,
The hand towel has a basis weight of 14.9 g/m2 or ^more and 17.9 g/ ^m2 or less,
The paper thickness of the hand towel is 0.55 mm/10 ply or more and 0.71 mm/10 ply or less;
The dry lateral strength of the hand towel is 2.9 N/25 mm or more and 6.7 N/25 mm or less;
The ratio (a/x×100) of the length (a) of the longitudinal direction of the outlet to the length (x) of the storage box in the longitudinal direction is 61.7% or more and 92.5% or less,
The ratio (W/x×100) of the horizontal sheet length (W) of the hand towel to the longitudinal length (x) of the storage box is 88.1% or more and 98.1% or less;
The length (b) of the short side of the storage box, which is the longest distance of the outlet, is 25 mm or more and 62 mm or less;
The resistance to removing the hand towels from the storage box is 0.3 N or more and 1.4 N or less for the third set to the 30th set from the bottom.
Filmless storage box with hand towel. The ratio (b/y×100) of the length (b) of the short side of the outlet to the length (y) of the short side of the storage box is 22.7% or more and 56.4% or less.
The filmless storage box containing the hand towel according to claim 1. The length (L) of the set of hand towels in the longitudinal direction when the set of hand towels is unfolded and the length (y) of the storage box in the transverse direction satisfy the following relationship:
The filmless storage box containing the hand towel according to claim 1 or 2.
81.8%≦(L/2)/y×100≦96.1% The dry machine direction tensile strength (DMDT) of the hand towel is 12.7 N/25 mm or more and 17.3 N/25 mm or less;
A filmless storage box containing the hand towel according to any one of claims 1 to 3. Using a tissue softness measuring device (TSA), a two-ply sample of the hand towel was placed on a sample stage and pressed from above with a bladed rotor at a pressing pressure of 100 mN, then rotated at a rotation speed of 2.0 (/sec). When the vibration of the sample stage was measured with a vibration sensor,
The intensity (TS750) of the maximum peak of the first spectrum from the low frequency side, which is automatically acquired by the software on the tissue softness measuring device TSA, is 19.1 dBV2 ^rms or more and 27.3 ^dBV2 rms or less.
A filmless storage box containing the hand towel according to any one of claims 1 to 4. The height of the storage box is 30 mm or more and 65 mm or less.
A filmless storage box containing the hand towel according to any one of claims 1 to 5. The length (x) of the storage box in the longitudinal direction is 200 mm or more and 260 mm or less,
The length (y) of the storage box in the short side direction is 95 mm or more and 125 mm or less.
A filmless storage box containing the hand towel according to any one of claims 1 to 6. The resistance to removing the hand towels from the storage box is 0.9 N or more and 2.7 N or less for the third set to the fifteenth set from the top.
A filmless storage box containing the hand towel according to any one of claims 1 to 7.