Packaging structure for absorbent articles

Abstract

To provide a package structure less apt to collapse in a stacked state.SOLUTION: A package structure 1 of an absorptive article in the present invention comprises receiving an absorptive article 3 in a package 5. The package 5 is a hexahedron consisting of a front face 7, a back face 9 opposite to the front face, a first side face 11, a second side face 13 opposite to the first side face, a top face 15, and a bottom face 17 opposite to the top face. A back face 9a of a package 5a of one package structure 1a and a front face 7b of a package 5b of the other package structure 1b adjacent thereto has a static frictional coefficient of 0.25 or greater.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a packaging structure for absorbent articles, and more particularly to a packaging structure for absorbent articles that contains absorbent articles in a package. [Background technology]

[0002] Generally, a packaging structure is known that includes a package in which absorbent articles are housed and whose outer surface is printed. For example, Patent Document 1 discloses a packaging structure in which absorbent articles are housed in a hexahedral package that has a front surface, a back surface, two side surfaces, a top surface, and a bottom surface.

[0003] The packaging structure is transported to a store and displayed on store shelves or the like with the bottom of the package facing down, i.e., placed vertically, or with the back of the package facing down, i.e., stacked flat. On the outer surface of the package of such a packaging structure, information indicating the type of absorbent article (tape type, pants type, etc.), size, etc., of the absorbent article is displayed on each side so that information such as the type of absorbent article contained therein can be recognized regardless of the display state. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2011-111165 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, packaging structures may become distorted during display. For example, in a display method in which packages are stacked flat, when multiple packages are moved while still stacked or when the packaging structure is removed from the display state, the display state of the packaging structures may become disarrayed or the packaging structure may become distorted.

[0006] The object of the present invention is to provide a packaging structure that can overcome the above-mentioned drawbacks of the prior art. [Means for solving the problem]

[0007] The packaging structure for absorbent articles of the present invention comprises an absorbent article contained in a package, the package being a hexahedron consisting of a front surface, a back surface opposite the front surface, a first side surface, a second side surface opposite the first side surface, a top surface, and a bottom surface opposite the top surface, and the static friction coefficient between the back surface of the package of one packaging structure and the front surface of the package of the other packaging structure is 0.25 or more. Effect of the Invention

[0008] The packaging structure for absorbent articles of the present invention is less likely to collapse when stacked. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1(A) is a perspective view showing the inside of a packaging structure for absorbent articles according to a first embodiment of the present invention, and FIG. 1(B) is a perspective view showing the outside of the packaging structure for absorbent articles according to the first embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view taken along line AA in FIG. 1(B) according to the embodiment of the present invention. [Diagram 3] FIG. 3(A) is a perspective view showing a packaging structure for absorbent articles according to an embodiment of the present invention placed vertically, and FIG. 3(B) is a perspective view showing a packaging structure for absorbent articles according to an embodiment of the present invention stacked flat. [Figure 4] FIG. 4 is a diagram showing a method for measuring the static friction coefficient. [Diagram 5] FIG. 5 is a diagram showing a state in which a plurality of packaging structures are housed in a cardboard box, which is an example of a container for housing the packaging structures. [Figure 6] FIG. 6 is a perspective view showing a packaging structure for absorbent articles according to a fourth embodiment of the present invention. [Figure 7] 7(A) and (B) are diagrams showing how the collapse resistance of a packaging structure is evaluated. [Figure 8] 8(A) and (B) are diagrams showing how the ease of inserting a packaging structure into a cardboard box is evaluated. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described. [Embodiment 1] As shown in Fig. 1(A), the packaging structure 1 includes a plurality of absorbent articles 3 and a package 5. The plurality of absorbent articles 3 are packaged in the package 5. The absorbent articles 3 are, for example, diapers or napkins.

[0011] The package 5 is a hexahedron having a front surface 7, a back surface 9 facing the front surface 7, a first side surface 11, a second side surface 13 facing the first side surface 11, a top surface 15, and a bottom surface 17 facing the top surface 15. Each surface of the package 5 has a mat layer 19 on the outermost layer, and the first side surface 11 has the mat layer 19 and a non-mat layer area 21a. As shown in FIG. 1B, the package 5 has a non-mat layer area 21b on the front surface 7, a non-mat layer area 21c on the first side surface 11, a non-mat layer area 21d on the second side surface 13, and a non-mat layer area 21e on the top surface 15. In the non-mat layer area 21a, for example, the size and number of multiple absorbent articles 3 packaged in the package 5 are written. In the non-mat layer areas 21b to 21e, for example, the logotype of the absorbent article 3 is written.

[0012] As shown in FIG. 2, the package 5 is laminated in the following order from the surface that will be the inside (the absorbent article side surface 23) when used in the packaging structure 1 to the surface that will be the outside: a film base layer 25, an ink layer 27, and a matte layer 19.

[0013] The film base layer 25 is a basic material for maintaining the shape and strength of the package 5 when it is used in the packaging structure 1. The film base layer 25 is preferably made of a film material having flexibility and strength. Examples of the film material having flexibility and strength include polyethylene, polyamide, polyester, polybutylene terephthalate, and polyethylene terephthalate. The film base layer 25 may be a single layer, or may be a laminated film having multiple layers made of the same or different materials.

[0014] The ink layer 27 is a layer for imparting information about the absorbent article 3, such as a pattern, a design, or letters, to the package 5. The material of the ink layer 27 is an ink composition. The ink composition contains, for example, carbon black, a diamine, a polyol, a curing agent, an organic solvent, and the like. The curing agent is, for example, an isocyanate. The organic solvent is, for example, toluene. The ink layer 27 can be formed by printing (applying) the above composition to the surface of the film substrate layer 25 by, for example, gravure printing so as to display a desired pattern, design, character, or the like.

[0015] The matte layer 19 is provided as the outermost layer of the package 5. The matte layer 19 creates fine irregularities on the surface of the package 5, and can set the coefficient of friction between the packages to a desired value. The matte layer 19 is a resin layer 31 in which a matting agent 29 is dispersed. To obtain a desired static friction coefficient, it is preferable to increase or decrease the amount of the matting agent to an appropriate amount, depending on the shape, particle size, etc. of the matting agent 29. For example, the matting agent is preferably contained in the resin layer in an amount of 1% by mass to 20% by mass, and more preferably 5% by mass to 15% by mass, based on the total weight of the matting agent and the resin. From the viewpoint of obtaining a desired static friction coefficient, the particle size of the matting agent is preferably 0.1 μm to 50 μm. For example, the matting agent 29 is preferably silica, alumina, calcium oxide, calcium carbonate, calcium sulfate, calcium silicate, or carbon black, and more preferably silica. The resin layer 31 is formed of, for example, an acrylic resin, an epoxy resin, a urethane resin, a polyolefin resin, a fluorine resin, a phenoxy resin, or a silicone resin.

[0016] 2, in the matte layer 19, a plurality of matting agents 29 protrude outward from the resin layer 31, forming fine irregularities on the surface. These fine irregularities can increase the friction between the packages. In addition, the density of the irregularities formed on the surface can be adjusted by changing the line count of the printing plate of the matte layer 19 and the concentration of the matting material, making it possible to change the frictional force between the packages. Increasing the number of lines printed on the matte layer 19 increases the frictional force, whereas decreasing the number of lines printed on the matte layer 19 decreases the frictional force. Also, increasing the density of the projections and recesses on the matte layer 19 increases the frictional force, whereas decreasing the density of the projections and recesses decreases the frictional force.

[0017] In such a packaging structure 1 of the first embodiment, as shown in Fig. 3(A), one packaging structure 1a and the other packaging structure 1b are displayed, for example, on a display shelf (not shown) of a store or the like in a state where the back surface 9a of the package 5a of one packaging structure 1a and the front surface 7b of the package 5b of the other packaging structure 1b are in contact with each other and the bottom surfaces 17a, 17b are facing down, i.e., in a vertically placed state. Alternatively, as shown in Fig. 3(B), they are displayed on a shelf or the like in a store in a state where the back surface 9a of the package 5a of one packaging structure 1a and the front surface 7b of the package 5b of the other packaging structure 1b are facing down, i.e., in a flat stacked state.

[0018] In the packaging structure 1 of embodiment 1, the static friction coefficient between the back surface 9a of the package 5a of one packaging structure 1a and the front surface 7b of the package 5b of the other packaging structure 1b is 0.25 or more from the viewpoint of preventing the load from collapsing, and preferably 0.30 or more, and while there is no particular upper limit, it is preferably 0.50 or less from the viewpoint of ease of removal of the package, more preferably 0.40 or less, more preferably 0.35 or less, and is preferably 0.25 or more and 0.50 or less, more preferably 0.30 or more and 0.40 or less, and more preferably 0.30 or more and 0.35 or less.

[0019] Such a packaging structure 1 of the first embodiment is unlikely to shift even when an external force is applied from a state in which the back surface 9a of the package 5a of one packaging structure 1a and the front surface 7b of the package 5b of the other packaging structure 1b are in contact with each other, so that the package is unlikely to collapse when displayed. For example, the packaging structure 1 of the first embodiment may be removed from a display state in which a plurality of packaging structures 1 are arranged side by side as shown in Fig. 3(A) or a display state in which they are stacked side by side as shown in Fig. 3(B). More specifically, in the display state shown in Fig. 3(A), the packages are removed by pulling the packages from the front row toward the front, and in the display state shown in Fig. 3(B), the packages are removed by pulling the packages from the top or bottom toward the front. In this way, when the packaging structure 1 of the first embodiment is taken out of the display state, the packaging structure is unlikely to collapse, and no time is required for the work of re-stacking, etc. Furthermore, since the packaging structure 1 of the first embodiment is unlikely to become disorganized when displayed, the appearance is not impaired, and there is no problem that the collapsed packaging structure 1 casts a shadow that makes it difficult to see the information on the contents. In addition, the packaging structure 1 of the first embodiment has the matte layer 19 on the outermost layer of the package 5, which can increase the user's desire to purchase the product.

[0020] The static friction coefficient described above can be measured using, for example, a measuring device 37 as shown in FIG. 4 in accordance with JIS-K7125 Plastic-Film and Sheet Friction Coefficient Test Method. The measuring device 37 includes a test stand 39, a pulley 41 installed on the test stand 39, a wire 43 hung on the pulley 41, and a weight 45 attached to one end of the wire 43 and placed on the test stand 39. The pulley 41 is a fixed pulley with a fixed axis of rotation. The first sample 47 is fixed to the measurement surface (contact surface) of the weight 45. The second sample 49 is fixed to the upper surface of the test stand 39 facing the measurement surface (contact surface) of the weight 45 by a known fixture or the like provided on the test stand 39.

[0021] The other end of the wire 43 is connected to a tensile tester (not shown) via a spring 51. The spring 51 absorbs the shock generated when the weight 45 starts to move. The tensile tester is, for example, an Autograph (Shimadzu Corporation, model number AG-X). The weight 45 has a weight of 190 g and a measurement surface dimension of 30 mm×100 mm (length×width) in a plan view. In the measurement surface dimension, the width is the dimension in the direction in which the weight 45 moves.

[0022] When the first sample 47 is in the form of a film, an air-through nonwoven fabric (basis weight: 20 g / m2) is attached to the weight 45 side, which is the non-measurement surface of the first sample 47, and the first sample 47 is fixed to the weight 45. When the second sample 49 is in the form of a film, an air-through nonwoven fabric (basis weight: 20 g / m2) is attached to the test table 39 side, which is the non-measurement surface of the second sample 49, and the second sample 49 is fixed to the upper surface of the test table 39. The first sample 47 has a horizontal dimension (100 mm) the same as the size of the measurement surface (contact surface) of the weight 45, and a vertical dimension (60 mm) larger than the size of the measurement surface (contact surface) of the weight, and is fixed in a state of being wrapped vertically around the weight. The size of the part located on the measurement surface (contact surface) of the weight is 30 mm x 100 mm (vertical x horizontal) in a plan view. The size of the second sample 49 is the same as or larger than the size of the measurement surface (contact surface) of the weight 45, for example, vertical 250 mm x 150 mm (vertical x horizontal).

[0023] When measuring the static friction coefficient between the back surface of the package of one packaging structure and the front surface of the package of the other packaging structure, the packaging structure from which the first sample is cut out and the packaging structure from which the second sample is cut out may be different packaging structures, but if packaging structures of the same configuration are stacked or are intended to be stacked next to each other with their front surfaces facing in the same direction, the first sample may be cut out from either the front or back surface of one packaging structure and the second sample may be cut out from the other. In addition, when matte and non-matte areas are mixed on either or both of the front and back sides of the package where the static friction coefficient is measured, each side is divided into three equal parts, the first, second, and third areas, by dividing the distance from the top edge to the bottom edge into thirds, and the friction coefficient between the first areas, the friction coefficient between the second areas, and the friction coefficient between the third areas are measured using samples cut from the center of each area. The average value of these values ​​is taken as the static friction coefficient value. For surfaces of a package that have a uniform surface condition, or for cardboard boxes whose inside surface condition is usually uniform, samples can be cut from any location. The tensile tester of the measuring device 37 is driven to apply an external force at a tensile speed of 300 mm / min to the weight 45 around which the first sample 47 is wound and fixed, via the spring 51 and wire 43. The external force gradually increases, exerting friction on the first sample 47, and reaches a maximum load. Immediately after reaching the maximum load, the weight starts to move. This maximum load is expressed as a static friction force.

[0024] Next, the static friction coefficient is calculated using the following formula (1). μS = FS / FP (1) In the above equation (1), μS is the static friction coefficient, FS is the static friction force [N], and FP is the normal force generated by the mass of weight 45 (=1.86 [N]).

[0025] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the gist of the present invention. Modifications of the embodiment of the present invention will be described below. In the modifications described below, the same reference numerals are used to designate parts that have the same effects as those in the above-described embodiment, and detailed descriptions of those parts will be omitted. The following description will focus on the main differences from the embodiment.

[0026] [Embodiment 2] In the packaging structure 1 of embodiment 2, it is preferable from the viewpoint of preventing the load from falling over that the static friction coefficient between the back surface 9a of the package 5a of one packaging structure 1a and the front surface 7b of the package 5b of the other packaging structure 1b is greater by 0.05 or more than the static friction coefficient between the first side surface 11a of the package 5a of one packaging structure 1a and the second side surface 13b of the package 5b of the other packaging structure 1b, and from the viewpoint of ease of removal of the package 6, it is preferable that the static friction coefficient be 0.5 or less. The static friction coefficient between the back surface 9a of the package 5a of one packaging structure 1a and the front surface 7b of the package 5b of the other packaging structure 1b is, as in embodiment 1, 0.25 or more, preferably 0.30 or more, and there is no particular upper limit, but it is preferably 0.50 or less, more preferably 0.40 or less, more preferably 0.35 or less, and is preferably 0.25 or more and 0.50 or less, more preferably 0.30 or more and 0.40 or less, and more preferably 0.30 or more and 0.35 or less. The static friction coefficient between the first side 11a of the package 5a of one packaging structure 1a and the second side 13b of the package 5b of the other packaging structure 1b is preferably 0.05 or more, more preferably 0.10 or more, and preferably 0.50 or less, more preferably 0.30 or less, and is 0.05 or more and 0.50 or less, preferably 0.10 or more and 0.30 or less.

[0027] In the packaging structure 1 of embodiment 2, the number of printed lines of each of the matte layers 19 on the first and second sides 11a, 13b is preferably 40% of the number of printed lines of the matte layers 19 on the front 7 and back 9, respectively, more preferably 50% or more, and even more preferably 60% or more, and is preferably 90% or less, more preferably 80% or less, and is preferably 40% to 90%, more preferably 50 to 80%, and even more preferably 60 to 80%. That is, the number of printing lines in each matte layer 19 on the first and second sides 11, 13 is preferably 175 or more per inch, more preferably 200 or more, and even more preferably 240 or more, and preferably 500 or less, more preferably 460 or less, and even more preferably 420 or less, and preferably 175 to 500, more preferably 200 to 460, and even more preferably 240 to 420.

[0028] Since the packaging structure 1 of the second embodiment has the above-mentioned configuration, when the packaging structures 1 of the second embodiment are stacked and stacked in a row and displayed in a parallel arrangement as shown in Fig. 3(B), when the packages are inserted into the display shelf in a stacked state, the friction between the side of the package to be inserted and the side of the package stacked in the adjacent row is smaller than the friction (static friction coefficient) between the front and back of the stacked packages, so the stacked packages to be inserted and the packaging structures displayed in the adjacent row can be inserted smoothly into the display shelf without collapsing, resulting in good display work efficiency. Also, when displayed in the state shown in Fig. 3(B), it is possible to prevent a user from removing one of the packaging structures 1 and removing the packaging structure 1 displayed in the adjacent row together.

[0029] [Embodiment 3] As shown in FIG. 5, in the packaging structure 1 of embodiment 3, the static friction coefficient between the back surface 9a of the package 5a of one packaging structure 1a and the front surface 7b of the package 5b of the other packaging structure 1b is greater than the static friction coefficient between the first and second side surfaces 11a, 11b, 13a, 13b of the one and other packaging structures 1a, 1b and the packaging structure side surface 55 that faces each side of a cardboard box 53, which is a container that contains a plurality of packaging structures in a stacked state, from the viewpoint of making it easier to remove the packaging structures 1a, 1b from the cardboard box 53 without collapsing them. The static friction coefficient between the packaging structure side surface 55 of the cardboard box 53 and the first and second side surfaces 11a, 11b, 13a, 13b of the one and other packaging structures 1a, 1b is preferably 0.05 or more, more preferably 0.10 or more, and is preferably 0.50 or less, more preferably 0.35 or less, and is preferably 0.05 or more and 0.50 or less, and more preferably 0.10 or more and 0.35 or less.

[0030] Such a packaging structure 1 of the third embodiment has the above-mentioned configuration, and therefore can be stored in a cardboard box 53 in the state shown in Fig. 5 without disturbing the display state of a plurality of packaging structures 1 stacked flat. This makes it easy to store the packaging structures in a stacked state in cardboard box 53 on the production line. The static friction value in the third embodiment can be obtained by cutting out the central regions of the side surfaces of the package 5, taking them as a first sample 47 and a second sample 49, and subjecting them to the measurement method described in Fig. 4. In this case, the cut-out dimensions of the first sample 47 and the second sample 49 are the same as those of the above-mentioned samples. The first sample 47 is a portion without the mat layer 19, and the second sample 49 is a portion with the mat layer 19.

[0031] [Embodiment 4] As shown in Fig. 6, in the packaging structure 1 of embodiment 4, the front 7 and back 9 of the package 5 have a plurality of first mat layer regions 57 made of a rectangular mat layer extending from the first side surface 11 to the second side surface 13, and the first and second side surfaces 11, 13 of the package 5 have a plurality of second mat layer regions 59 made of a rectangular mat layer extending from the top surface 15 to the bottom surface 17. In Fig. 6, the first mat layer region 57 on the back surface 9 and the second mat layer region 59 on the second side surface 13 are omitted. It is preferable that the packaging structure 1 of the fourth embodiment satisfies the following formula (formula) from the viewpoint of achieving a desired coefficient of friction and preventing collapse of the cargo. The average matte ratio in the lateral direction of the first matte layer region 57 on the front surface 7 and the back surface 9>the total matte ratio in the lateral direction of the second matte layer region 59 on the first and second side surfaces 11, 13 (equation)

[0032] In the packaging structure 1 of embodiment 4, the average lateral mat ratio of the first mat layer region 57 on the front 7 and back 9, i.e., the lateral dimension of the first mat layer region 57 (the length from the first side 11 to the second side 13), is preferably 60% or more in average of the lateral dimensions of each mat layer region when the shortest distance from the first side 11 to the second side 13 is taken as 100%, from the viewpoint of achieving a desired friction coefficient and preventing cargo collapse, more preferably 80% or more, even more preferably 90% or more, and preferably 100% or less, and preferably 60% or more and 100% or less, more preferably 80% or more and 100% or less, and even more preferably 90% or more and 100% or less. In addition, the vertical dimension of the first mat layer region 57 (the length from the top surface 15 to the bottom surface 17) is 5% or more and 30% or less, preferably 5% or more and 20% or less, and more preferably 5% or more and 15% or less, from the viewpoint of a desired coefficient of friction and preventing the load from shifting, when the shortest distance from the top surface 15 to the bottom surface 17 is taken as 100%. Furthermore, the total vertical dimension of the plurality of first mat layer regions 57 is preferably 10% or more, more preferably 15% or more, and even more preferably 30% or more, and is preferably 80% or less, more preferably 75% or less, and even more preferably 70% or less, and is preferably 10 to 80%, more preferably 15% or more and 75% or less, and even more preferably 30% or more and 70% or less, from the viewpoint of a desired coefficient of friction and preventing the load from shifting.

[0033] The number of first mat layer regions on the front 7 and back 9 is preferably 2 or more, more preferably 15 or more, from the standpoint of achieving the desired friction coefficient and preventing cargo from shifting, and is preferably 15 or less, more preferably 10 or less, and is preferably 2 to 15, more preferably 4 to 10. The vertical dimension of the second mat layer region 59 is preferably 60% or more, more preferably 80% or more, even more preferably 90% or more, and preferably 100% or less, from the viewpoint of preventing the collapse of the cargo, with the average value of the vertical dimension of each mat layer region being the desired coefficient of friction, and is preferably 60% or more and 100% or less, more preferably 80% or more and 100% or less, and even more preferably 90% or more and 100% or less. The horizontal dimension of the second mat layer region 59 is preferably 5% or more, more preferably 30% or less, more preferably 20% or less, and even more preferably 15% or less, from the viewpoint of preventing the collapse of the cargo, with the average value of the vertical dimension of each mat layer region being the desired coefficient of friction, and is preferably 5% or more, and is preferably 30% or less, more preferably 20% or less, and even more preferably 15% or less, from the viewpoint of preventing the collapse of the cargo.

[0034] Furthermore, assuming that the total lateral mat ratio of the second mat layer regions 59 on the first and second sides 11, 13, i.e., the sum of the lateral dimensions of the multiple second mat layer regions 59, is smaller than the average ratio of the lateral dimension of the first mat layer region to the shortest distance from the first side 11 to the second side 13, from the standpoint of achieving a desired friction coefficient and preventing cargo collapse, it is preferably 10% or more, more preferably 15% or more, and even more preferably 30% or more. It is also preferably 80% or less, more preferably 75% or less, and even more preferably 70% or less, and is preferably 10 to 80%, more preferably 15% or more and 75% or less, and even more preferably 30% or more and 70% or less. The number of second mat layer regions on the top surface 15 and bottom surface 17 is preferably 3 or more, and more preferably 15 or more, from the standpoint of achieving the desired friction coefficient and preventing cargo from falling over, and is preferably 15 or less, and more preferably 10 or less, and is preferably 2 to 15, and more preferably 3 to 10.

[0035] Since the packaging structure 1 of embodiment 4 has the configuration described above, when multiple packaging structures 1 are arranged side by side, the friction between the front of one package and the back of the other package in the direction from the bottom to the top of the packages is greater than the friction between the side of one package and the side of the other package in the above direction, so that the multiple packaging structures 1 can be stored in a cardboard box 53 in the state shown in Figure 5 without disrupting the display state of the stacked multiple packaging structures 1.

[0036] In the packaging structure of the present invention, the pack pressure inside the package is preferably 1.2 kPa or more, more preferably 1.5 kPa or more, and preferably 2.5 kPa or less, more preferably 2.2 kPa or less, from the viewpoint of preventing collapse of the cargo and ease of removal of the packaging structure, and is also preferably 1.2 kPa or more and 2.5 kPa or less, and more preferably 1.5 kPa or more and 2.2 kPa or less. The pack pressure inside the package was determined by measuring the compression characteristics relative to the thickness of the diaper and converting it into a load equivalent to the thickness of the diaper inside the package. Specifically, an Autograph (Shimadzu Corporation, model number AG-X) was used to compress five stacked diapers until a load of 50 kgf was applied, and the compression force (load) at the point when the thickness became the same as the thickness of five diapers inside the package was taken as the pack pressure. Note that for the measurement, diapers were used that had been taken out of the package and left for more than 10 hours. The thickness of the diapers inside the package was calculated from the package dimensions and the number of diapers inside the package.

[0037] Although the above-described embodiment has a matte layer, it is also possible to satisfy the above-described conditions for the static friction coefficient with a configuration that does not have a matte layer.

[0038] In relation to the above-mentioned embodiment of the present invention, the following absorbent article is further disclosed. <1> A packaging structure for absorbent articles, comprising an absorbent article housed in a package, the package being a hexahedron consisting of a front surface, a back surface opposite the front surface, a first side surface, a second side surface opposite the first side surface, a top surface, and a bottom surface opposite the top surface, and the static friction coefficient between the back surface of the package of one packaging structure and the front surface of the package of the other packaging structure is 0.25 or more, preferably 0.25 or more and 0.50 or less, and more preferably 0.30 or more and 0.40 or less.

[0039] <2> The static friction coefficient between the back surface of the package of one packaging structure and the front surface of the package of the other packaging structure is at least 0.05 higher than the static friction coefficient between the first side surface of the package of one packaging structure and the second side surface of the package of the other packaging structure, and is preferably at least 0.05 and at most 0.50, and more preferably at least 0.10 and at most 0.30. <1> The packaging structure according to claim 1. <3> The static friction coefficient between the back surface of the package of one packaging structure and the front surface of the package of the other packaging structure is greater than the static friction coefficient between the first and second side surfaces of the one and other packaging structures and the packaging structure side surfaces facing the first and second side surfaces of a container that contains the packaging structures in a stacked state. big The above <1> or <2> The packaging structure according to claim 1. <4> The static friction coefficient between the packaging structure side surface of the container and the first and second side surfaces of the one and other packaging structures is 0.05 or more, preferably 0.05 to 0.50, more preferably 0.10 to 0.35. <1> ~ <3> 13. A packaging structure according to any one of claims 1 to 12. <5> Each surface of the package has a matte layer having an uneven surface on the outermost layer. <1> ~ <4> 13. A packaging structure according to any one of claims 1 to 12.

[0040] <6> The number of printing lines of the matte layers on the first and second side surfaces is 40% to 90%, preferably 50% to 80%, and more preferably 60% to 80% of the number of printing lines of the matte layers on the front and back surfaces. <5> The packaging structure according to claim 1. <7> Each surface of the package is laminated in the order of a film base layer, an ink layer, and a matte layer from the inner surface to the outer surface. <1> ~ <6> 13. A packaging structure according to any one of claims 1 to 12. <8> The material of the film substrate is one or more selected from the group consisting of polyethylene, polyamide, polyester, polybutylene terephthalate, and polyethylene terephthalate. <7> The packaging structure according to claim 1. <9> The material of the ink layer contains carbon black, a diamine, a polyol, a hardener and an organic solvent. <7> or <8> The packaging structure according to claim 1. <10> the matte layer is formed of a resin layer selected from an acrylic resin, an epoxy resin, a urethane resin, a polyolefin resin, a fluorine resin, a phenoxy resin, and a silicone resin, in which a matte agent selected from silica, alumina, calcium oxide, calcium carbonate, calcium sulfate, calcium silicate, and carbon black is dispersed; <7> ~ <9> 13. The packaging structure according to any one of claims 1 to 12.

[0041] <11> The front and back surfaces of the package include a first mat layer region formed of a mat layer extending from a first side surface to a second side surface, and the first and second side surfaces of the package include a second mat layer region formed of a mat layer extending from the top surface to the bottom surface. <6> The packaging structure according to claim 1. <12> The number of the first mat layer regions on the front surface and the back surface is 2 to 15, preferably 4 to 10. <11> The packaging structure according to claim 1. <13> The number of the second mat layer regions on the top surface and the bottom surface is 2 to 15, preferably 3 to 10. <11> or <12> The packaging structure according to claim 1. <14> The pack pressure inside the package is preferably 1.2 kPa or more, more preferably 1.5 kPa or more, and is preferably 2.5 kPa or less, more preferably 2.2 kPa or less, and is preferably 1.2 kPa or more and 2.5 kPa or less, and more preferably 1.5 kPa or more and 2.2 kPa or less. <1> ~ <13> 13. The packaging structure according to any one of claims 1 to 12.

[0042] In order to confirm the effects of the present invention, packaging structures of Examples 1 to 3 and Comparative Examples 1 and 2 were manufactured and comparative experiments were carried out. Example 1 A polyethylene film used as the film base layer of the hexahedral packaging structure, silica (matting agent), any one of the resin layer materials used as the resin layer 31, and a plurality of absorbent articles (diapers) were prepared. Next, a matting layer with the same number of printing lines (400 lines) was formed on each side of the film base layer (polyethylene film) using the matting agent and the resin layer material. Next, a matting layer was formed on the polyethylene film to form a bag-shaped (storable) package, and a plurality of absorbent articles were housed in this package to produce four packaging structures of Example 1.

[0043] Example 2 The same materials as in Example 1 were prepared. Next, matte layers with the same printing line count (400 lines) were formed on the front, back, top, and bottom surfaces of a hexahedral polyethylene film using a matte agent and a resin layer material, and matte layers with approximately 63% of the printing line count (250 lines) of the above four surfaces were formed on the first and second side surfaces of the polyethylene film to form a package. Then, a plurality of absorbent articles were housed in the package to produce four packaging structures of Example 2.

[0044] Example 3 The same materials as those in Example 1 were prepared. Next, a plurality of first mat layer regions 57 were formed on the front and back of a hexahedral polyethylene film as shown in FIG. 6, and a plurality of second mat layer regions 59 were formed on the first and second side surfaces of the polyethylene film to form a package. Then, a plurality of absorbent articles were housed in the package to manufacture four packaging structures of Example 3. Here, the horizontal dimensions of each of the first mat layer regions 57 were 100% when the shortest distance from the first side surface to the second side surface was taken as 100%, and the sum of the vertical dimensions of the plurality of first mat layer regions 57 was 60% when the shortest distance from the top surface to the bottom surface was taken as 100%. In addition, the vertical dimensions of each of the second mat layer regions 59 were 100% when the shortest distance from the top surface to the bottom surface was taken as 100%, and the sum of the horizontal dimensions of the plurality of second mat layer regions was 50% when the shortest distance from the first side surface to the second side surface was taken as 100%.

[0045] Example 4 The same materials as in Example 1 were prepared. A package was constructed in which the mat concentration of the first mat layer regions 57 and the second mat layer regions 59 was higher than that in Example 3. A plurality of absorbent articles were then housed in the package to produce four packaging structures of Example 4. The matte concentration was set higher than that in Example 3 by increasing the content of the matte agent in the resin layer.

[0046] Example 5 The same materials as in Example 1 were prepared. Then, as in Example 3, a package was constructed in which a plurality of first mat layer regions 57 were formed on the front and back sides of a polyethylene film, and the first and second sides were non-matted. Then, a plurality of absorbent articles were placed in the package to produce four packaging structures of Example 5. The pack pressure inside the package in each of the packaging structures of Examples 1 to 5 was 1.8 kPa.

[0047] Comparative Example 1 A hexahedral film base layer using a polyethylene film and a plurality of absorbent articles (diapers) were prepared. A package was constructed on this film base layer without forming a mat layer. Next, a plurality of absorbent articles were housed in this package to produce four packaging structures of Comparative Example 1.

[0048] Comparative Example 2 The same materials as in Example 1 were prepared. Next, a second mat layer region 59 was formed on the front and back of the hexahedral film base layer using the polyethylene film of Example 3, and a plurality of first mat layer regions 57 were formed on the first and second side surfaces of the hexahedral film base layer to form a package. Next, a plurality of absorbent articles were housed in the package to manufacture four packaging structures of Comparative Example 2. Here, each vertical dimension of the second mat layer region was 100% when the shortest distance from the top surface to the bottom surface was taken as 100%, and the sum of the horizontal dimensions of the plurality of second mat layer regions was 50% when the shortest distance from the first side surface to the second side surface was taken as 100%. In addition, each horizontal dimension of the first mat layer region was 100% when the shortest distance from the first side surface to the second side surface was taken as 100%, and the sum of the vertical dimensions of the plurality of first mat layer regions was 60% when the shortest distance from the top surface to the bottom surface was taken as 100%.

[0049] Rating 1 (evaluation of the packaging structure's resistance to collapse) As shown in (A) and (B) of FIG. 7, four packaging structures of each of Examples 1 to 5 and Comparative Examples 1 and 2 were stacked flat on a desk (not shown) at about waist height of a tester, and an evaluation test was performed in which both sides of the bottom packaging structure were placed with hands and an external force was applied to move it a distance of 50 cm within 5 seconds. The evaluation test was repeated five times by the same tester, and the average value of the four-level score was calculated. The four-level score is a score that judges the alignment of the packaging structures 1 before and after the movement according to the following criteria. For example, as shown in 1<2<3<4, 1 indicates that the packaging structures stacked on the upper side collapsed, 2 indicates that the packaging structures stacked on the upper side were significantly shifted, 3 indicates that the packaging structures stacked on the upper side were slightly shifted, and 4 indicates that the alignment of the packaging structures stacked on the upper side was maintained. Here, the size of the four stacked packaging structures 1 was 50 cm×38 cm×35.5 cm (H×L×T in FIG. 7(A)).

[0050] Rating 2 (Ease of putting into a cardboard box) As shown in FIG. 8A, four packaging structures 1 were stacked flat on the lid of one side of a cardboard box 53, and the packaging structure 1 was pushed to the bottom surface 53a of the cardboard box 53 within three seconds with one hand on the front surface (top surface 15) of the bottom packaging structure 1 (FIG. 8B). The evaluation test was performed five times by the same tester, and the average of the four-level score was calculated. The four-level score was determined by judging the alignment state of the packaging structures 1 at that time according to the following criteria. For example, 1<2<3<4, where 1 indicates that the packaging structures stacked on the upper side collapsed, 2 indicates that the packaging structures stacked on the upper side were significantly displaced, 3 indicates that the packaging structures stacked on the upper side were slightly displaced, and 4 indicates that the alignment state of the packaging structures stacked on the upper side was maintained. The inner dimensions of the cardboard box were 51 cm×39 cm×36 cm (H×L×T in FIG. 8A).

[0051] The results of evaluations 1 and 2 are shown in Table 1 below, together with the measurement results of the static friction coefficients of the packages of the packaging structures of Examples 1 to 5 and Comparative Examples 1 and 2. In Table 1 below, A indicates the static friction coefficient between the back surface of the package of one packaging structure and the front surface of the package of the other packaging structure, B indicates the static friction coefficient between the first side surface of the package of one packaging structure and the second side surface of the package of the other packaging structure, C indicates the static friction coefficient between the packaging structure side surface of the cardboard box and the front and back surfaces of the packaging structure, and D indicates the static friction coefficient between the packaging structure side surface of the cardboard box and the side surface of the packaging structure. In Table 1, the static friction coefficients A and B indicate those between the back surface of the package of one packaging structure and the front surface of the package of the other packaging structure, and the static friction coefficients C and D indicate those between the side surface of the package of one packaging structure and the side surface of the package of the other packaging structure.

[0052] [Table 1]

[0053] As shown in Table 1, when comparing the packaging structures of Examples 1 to 5 with the packaging structures of Comparative Examples 1 and 2, the static friction coefficient between the back surface of the package of one packaging structure and the front surface of the package of the other packaging structure is 0.25 or more in each of the packaging structures of Examples 1 to 5. Therefore, it was confirmed from the results of Evaluation 1 that the packaging structures 1 of embodiment 1 are less likely to collapse when the packaging structures 1 are successively pulled toward the top or bottom one and removed from a flat-stacked display state as shown in FIG. 3(B).

[0054] Furthermore, when comparing the packaging structure of Example 1 with the packaging structure of Example 2, the static friction coefficient between the back side of the package of one packaging structure and the front side of the package of the other packaging structure is 0.05 or more greater than the static friction coefficient between the first side of the package of one packaging structure and the second side of the package of the other packaging structure. Therefore, it was confirmed from the results of Evaluation 2 that the multiple packaging structures 1 stacked flat can be stored in a cardboard box 53 in the state shown in Figure 5 without disturbing the display state.

[0055] Furthermore, when comparing the packaging structure of Example 3 with the packaging structure of Comparative Example 2, the packaging structure of Example 3 has a front and back surface of the package that include a plurality of first mat layer regions 57 made of a rectangular mat layer extending from the first side to the second side, and the first and second sides of the package include a plurality of second mat layer regions 59 made of a rectangular mat layer extending from the top surface to the bottom surface. Therefore, it was confirmed from the results of Evaluation 2 that the packaging structures 1 can be stored in a cardboard box 53 in the state shown in Figure 5 without disrupting the display state of the stacked packaging structures 1. When comparing the packaging structure of Example 3 with the packaging structure of Example 4, the static friction values ​​of the first mat layer region 57 and the second mat layer region 59 of Example 4 were greater than those of Example 3, confirming the results of Evaluation 1. When the packaging structure of Example 4 and the packaging structure of Example 5 are compared, the static friction value of each side surface of Example 5 is lower than that of Example 4, and therefore the result of Evaluation 1 is confirmed. [Explanation of symbols]

[0056] 1...Packaging structure 3. Absorbent articles 5. Package 7...Front 9...Back 11. First aspect 13. The second aspect 15 Top 17 Bottom 19. Matte layer 25··Fill base layer 27 Ink layer 57 - First mat layer area 59...Second mat layer area

Claims

1. A packaging structure for absorbent articles, comprising an absorbent article housed in a package, the packaging structure comprising: the package is a hexahedron having a front surface, a back surface opposite the front surface, a first side surface, a second side surface opposite the first side surface, a top surface, and a bottom surface opposite the top surface; The static friction coefficient between the back surface of the package of one packaging structure and the front surface of the package of the other packaging structure is 0.25 or more, and A packaging structure having a static friction coefficient greater than that between a first side of a package of the one packaging structure and a second side of a package of the other packaging structure.

2. 2. The packaging structure according to claim 1, wherein the static friction coefficient between the back surface of the package of one packaging structure and the front surface of the package of the other packaging structure is greater than the static friction coefficient between each of the first and second sides of one and the other packaging structures and a packaging structure side surface facing the first and second sides of a container that contains the packaging structures in a stacked state.

3. A packaging structure for absorbent articles, comprising an absorbent article housed in a package, the packaging structure comprising: the package is a hexahedron having a front surface, a back surface opposite the front surface, a first side surface, a second side surface opposite the first side surface, a top surface, and a bottom surface opposite the top surface; The static friction coefficient between the back surface of the package of one packaging structure and the front surface of the package of the other packaging structure is 0.25 or more; A packaging structure in which the static friction coefficient between the back surface of a package of one packaging structure and the front surface of a package of the other packaging structure is greater than the static friction coefficient between each of the first and second sides of the one and other packaging structures and a packaging structure side surface facing the first and second sides of a container that contains the packaging structures in a stacked state.

4. The packaging structure according to any one of claims 1 to 3, wherein each surface of the package is provided with a matte layer having projections and recesses on the outermost layer.

5. The front and rear surfaces of the package include a plurality of first mat layer regions each including a mat layer extending from a first side surface to a second side surface; The first and second sides of the package are mated extending from the top surface to the bottom surface. A plurality of second matte layer regions each consisting of a matte layer; The packaging structure according to claim 4, which satisfies the following formula: Average matte ratio in the lateral direction of the first matte layer region on the front and back surface>the ratio of the sum of the lateral dimensions of the multiple second matte layer regions on the first and second sides when the shortest distance from the front surface to the back surface is taken as 100% (equation)

6. The packaging structure according to any one of claims 1 to 5, wherein a pack pressure inside the package is 1.2 kPa or more and 2.5 kPa or less.

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