Method for manufacturing individually packaged absorbent article and packaged product in which same is housed in package

Abstract

Provided is an individually packaged absorbent article in which an absorbent article is individually packaged by a paper packaging sheet wherein the exposed surface of the packaging sheet, which is exposed on the front surface when the absorbent article is individually packaged, is printed. The MMD (average friction coefficient variation) of the exposed surfaces before being printed is 0.050 or less, and the static friction coefficient between the exposed surfaces of a plurality of individually packaged absorbent articles after being printed is 0.60 or more.

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a packaged product in which an individually packaged absorbent article and the absorbent article are contained in a package. Background Art

[0002] Generally speaking, absorbent articles such as sanitary napkins, panty liners, and incontinence pads are provided in a state of being housed in a package.

[0003] Patent Document 1 discloses a technique in which a coating layer (mat layer) having irregularities is provided on the outermost layer on the surface of a package containing absorbent articles to increase the friction of the surface and prevent the package from falling apart when displayed.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2020-196541 Summary of the invention

[0005] [Problems to be solved by the present invention]

[0006] For reasons such as ensuring hygiene during storage and improving convenience during carrying, absorbent articles such as sanitary napkins, panty liners, and incontinence pads are stored in packages as individually wrapped absorbent articles individually wrapped with packaging sheets. Since packaging sheets are sheets that individually wrap absorbent articles, they generate more garbage after use than packages. Therefore, in recent years, from the perspective of environmental issues, packaging sheets made of paper materials have been promoted instead of conventional nonwoven fabrics or plastic films.

[0007] However, in the case of such individually packaged absorbent articles, the absorbent articles are carried in a state of being stored in a packaging sheet. Therefore, it is desirable to print on the surface of the packaging sheet to avoid the situation where the absorbent articles are recognized at a glance. In order to improve the design by printing on the packaging sheet, it is considered to use a paper with high surface smoothness and high printability as the packaging sheet.

[0008] On the other hand, multiple individually wrapped absorbent articles are placed in a package in a stacked state. Therefore, when using paper with a high surface smoothness as a packaging sheet, when multiple individually wrapped absorbent articles are stacked and placed in a package, the individually wrapped absorbent articles are likely to slip between each other, which may reduce productivity. In addition, paper with a high surface smoothness has a so-called copy paper-like appearance and skin-touch feel, which may give people a cheap impression.

[0009] The present invention has been developed in view of the above-mentioned problems of the conventional technology, and an object of the present invention is to provide an individually packaged absorbent article that can achieve both printability and avoid reduction in production efficiency even when a plurality of absorbent articles are stacked and stored in a package.

[0010] [Methods used to solve the problem]

[0011] In order to achieve the above object, the present invention is an individually packaged absorbent article, which is an individually packaged absorbent article individually packaged by a paper packaging sheet, wherein:

[0012] The packaging sheet has a printed surface that is exposed when the absorbent article is individually packaged.

[0013] The MMD (mean friction coefficient variation) of the exposed surface before printing is 0.050 or less, and the static friction coefficient between the exposed surfaces of the plurality of individually packaged absorbent articles after printing is 0.60 or more.

[0014] In the present invention constructed as described above, the exposed surface exposed to the surface when the absorbent article is individually packaged is made to have an MMD of 0.050 or less before printing, thereby having printability. In addition, by making the static friction coefficient between the exposed surfaces of the plurality of individually packaged absorbent articles after printing to be 0.60 or more, when the plurality of individually packaged absorbent articles are stacked and stored in a package, the individually packaged absorbent articles are not likely to slip, thereby avoiding a decrease in production efficiency. In addition, by making the static friction coefficient between the exposed surfaces of the plurality of individually packaged absorbent articles after printing to be 0.60 or more, it is not easy to give a cheap impression in terms of appearance and skin touch.

[0015] Furthermore, the blending ratio of the recycled fiber that can constitute the packaging sheet is 20% or more.

[0016] In the individually wrapped absorbent article configured as described above, the coefficient of static friction between the exposed surfaces of the plurality of individually wrapped absorbent articles after printing becomes large.

[0017] Furthermore, the packaging sheet may be configured to contain the fiber bundle.

[0018] In the individually packaged absorbent article configured as described above, the coefficient of static friction between the exposed surfaces of the plurality of individually packaged absorbent articles after printing is also increased.

[0019] Furthermore, a method for manufacturing a packaged product in which individually packaged absorbent articles are stored in a package may include the following steps:

[0020] Printing the packaging sheet;

[0021] placing the absorbent article on the packaging sheet, and folding the packaging sheet so as to wrap the absorbent article in a manner that the printed surface is exposed on the surface, thereby manufacturing the individually packaged absorbent article; and

[0022] A plurality of the individually packaged absorbent articles are stacked and stored in a package.

[0023] [Effects of the Invention]

[0024] According to the present invention, even when a plurality of sheets are stacked and stored in a package, it is possible to achieve both printability and avoid reduction in production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a plan view showing one embodiment of the individually packaged absorbent article of the present invention.

[0026] Figure 2 Yes Figure 1 A top view of the individually packaged absorbent article shown in the unfolded state.

[0027] Figure 3 It is along Figure 1 A cross-sectional view of line II is shown.

[0028] Figure 4 yes Figure 1 An enlarged view of site II is shown.

[0029] Figure 5 It is used to illustrate Figures 1 to 4 The flowchart of the manufacturing steps of the package product in which the individually packaged absorbent articles are accommodated in the package is shown.

[0030] Figure 6 yes Figures 1 to 4 The figure shows a state where the individually packaged absorbent article is accommodated in a package. DETAILED DESCRIPTION

[0031] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the same or corresponding structures in the drawings may be denoted by the same reference numerals and the description thereof may be omitted.

[0032] <Overall structure of individually packaged absorbent article>

[0033] Figure 1 This is a plan view showing one embodiment of the individually packaged absorbent article of the present invention. Figure 2 Yes Figure 1 The individually packaged absorbent article 100 shown in the figure is a top view of the unfolded state, and is a view observed from the inner surface of the packaging sheet 10 or from the skin side of the absorbent article 1. Figure 3 It is along Figure 1 A cross-sectional view of line II is shown.

[0034] like Figures 1 to 3 As shown in FIG. 1 , this embodiment is an individually packaged absorbent article 100, which includes a packaging sheet 10 and an absorbent article 1 that is individually packaged by the packaging sheet 10. Figure 2 As shown, the packaging sheet 10 is, for example, in an unfolded state, in an elongated shape, having a long side direction (longitudinal direction) D1 and a short side direction (transverse direction) D2 orthogonal to the long side direction. In addition, the long side direction D1 and the short side direction D2 of the packaging sheet 10 also correspond to the long side direction and the short side direction of the absorbent article 1, respectively.

[0035] <Absorbent articles>

[0036] The absorbent article 1 packaged by the packaging sheet 10 has a shape for being worn in a manner opposite to the discharge outlet of body fluids (menstrual blood, vaginal discharge, urine, etc.), for example, a flat and elongated article. Specific examples of the absorbent article 1 include sanitary napkins, panty liners (leucorrhea pads), pads for light incontinence, and the like.

[0037] For example Figure 2 As shown, the absorbent article 1 includes a liquid-permeable top sheet 3, a liquid-impermeable back sheet (not shown), and an absorbent body 4 disposed between the top sheet 3 and the back sheet.

[0038] As the back sheet, a sheet having at least impermeability such as an olefin resin sheet such as polyethylene or polypropylene can be used. A laminated nonwoven fabric formed by laminating a nonwoven fabric on a polyethylene sheet or the like, and a laminated sheet of a nonwoven fabric having substantially liquid-impermeable properties by interposing a waterproof film between the nonwoven fabrics can be used. In addition, a sheet having moisture permeability can also be used.

[0039] As the top sheet 3, porous or non-porous nonwoven fabrics and porous plastic sheets are suitable. As raw material fibers constituting the nonwoven fabric, for example, the following fibers can be used alone or in combination: synthetic fibers such as olefins such as polyethylene or polypropylene, polyester, and polyamide; regenerated fibers such as rayon and cuprammonium fibers; blended fibers of these fibers; and natural fibers such as cotton.

[0040] The absorbent 4 is not limited, as long as it is a material that can absorb and retain body fluids, and preferably includes cotton pulp and absorbent polymers. As absorbent polymers, superabsorbent polymer granular powder (superabsorbent polymer (SAP)), superabsorbent polymer fiber (superabsorbent fiber (SAF)) and a combination thereof can be used. As pulp, there can be cited fibers composed of cellulose fibers and artificial cellulose fibers, wherein cellulose fibers are chemical pulps obtained from wood, dissolving pulps, etc., and artificial cellulose fibers are artificial fibers, acetates, etc. As pulp, it can be broadleaf pulp obtained from broadleaf wood, coniferous pulp obtained from coniferous wood, or mixed pulps thereof. In addition, pulp can also be recycled pulp regenerated from used pulp.

[0041] The thickness of the absorbent body 4 can be 0.5 to 25 mm. The absorbent body 4 can also be configured to bulge out from an area corresponding to the body fluid outlet (area corresponding to the body fluid outlet) or an area corresponding to the gluteal groove behind the area corresponding to the body fluid outlet. The absorbent body 4 has a size and shape that does not exceed the top sheet 3 and the back sheet, and the back sheet and the outer edge of the top sheet 3 are joined by an adhesive such as a hot melt adhesive, or by a joining means such as heat sealing or ultrasonic sealing at the front and rear edge portions of the absorbent body.

[0042] like Figure 2 As shown, side sheets 7 may be provided along the longitudinal direction D1 at both ends in the short-side direction D2 on the lateral outer side of the absorber 4. As the side sheets 7, water-repellent nonwoven fabric or hydrophilic nonwoven fabric may be used.

[0043] It should be noted that in Figures 1 to 3 In the example shown, the absorbent article 1 is a so-called wingless type without wings, but the absorbent article 1 may be configured as a winged article having wings extending laterally. The wings may be formed by joining the side sheets to the back sheet.

[0044] In addition, a non-slip adhesive portion may be provided on the back sheet side (non-skin side, i.e., the side opposite to the underwear when worn) of the absorbent article 1 to prevent the absorbent article 1 from shifting from the underwear when worn on the underwear. The non-slip adhesive portion is formed, for example, in the form of multiple strips extending in the long side direction D1 or the short side direction D2.

[0045] The total length of the absorbent article 1 can be set to 140 to 430 mm, and the width of the absorbent article 1 (the width of the main body after removing the wings when the absorbent article 1 has wings) can be set to 40 to 130 mm.

[0046] <Packaging Sheet>

[0047] The packaging sheet 10 in this embodiment is paper. By using the packaging sheet 10 made of paper, it is possible to contribute to plastic reduction, thereby contributing to the achievement of sustainable development goals. In addition, paper can give a unique texture, such as a soft appearance and skin touch that gives a natural material.

[0048] The packaging sheet 10 is made of, for example, Yunlong paper, and printing is performed on the exposed surface of the absorbent article 1 after it is individually packaged. The packaging sheet 10 is not limited to Yunlong paper, as long as it meets the conditions described below. The conditions before and after printing of the packaging sheet 10 will be described later.

[0049] The size of the packaging sheet 10 may correspond to the size and shape of the absorbent article 1 to be packaged, for example, when the packaging sheet 10 is fully unfolded (not folded back), the length of the long side direction D1 (sometimes referred to as the length) may be set to 100 to 450 mm, and the length of the short side direction D2 (sometimes referred to as the width) may be set to 70 to 250 mm. In the example shown in the figure, the packaging sheet 10 has a rectangular shape in the unfolded state, but may also have a shape such as an oblong oval.

[0050] <Packaging structure of individually packaged absorbent articles>

[0051] like Figure 1 and Figure 3 As shown, the absorbent article 1 is packaged by being folded together with the packaging sheet 10 to form an individually packaged absorbent article 100. When folded, as shown in FIG. Figure 2 As shown, first, the absorbent article 1 is placed on the inner surface of the packaging sheet 10 in a state in which the back sheet side of the absorbent article 1 is opposite to the inner surface of the packaging sheet 10. Then, the packaging sheet 10 and the absorbent article 1 are folded together in the long side direction D1 at the first fold line F1 and the second fold line 2 along the width direction (short side direction) D2. More specifically, at the first fold line F1, the first region R1 including one end 11 of the packaging sheet 10 in the long side direction D1 is folded back in the long side direction D1, and at the second fold line F2, the second region R2 including the other end 12 of the packaging sheet 10 in the long side direction D1 is folded back. The area between the first region R1 and the second region R2 of the packaging sheet 10 is the third region R3. In the example shown in the figure, the second region R2 of the packaging sheet 10 is folded first, and then the first region R1 is folded in a manner overlapping on the outer surface of the second region R2 ( Figure 1 and Figure 2), but the folding order of the first region R1 and the second region R2 may be reversed, and the folding order of the first region R1 and the second region R2 may be reversed. In this way, after the packaging sheet 10 is rolled into three folds (inner three folds) together with the absorbent article 1 to wrap the absorbent article 1, the two edge portions in the short side direction D2 are sealed along the long side direction D1 to form the sealed portion 15.

[0052] Such a packaging form of three or more folds can be formed relatively simply, and can hygienically wrap the absorbent article 1, and it is also easy to take out the absorbent article 1. It should be noted that the folding form is not limited to three folds, and can be four or more folds or two folds.

[0053] In the individually wrapped absorbent article 100, an adhesive tape 30 is provided at the center of the short side direction D2 near the edge of the first region R1 (one end 11 of the packaging sheet 10). Figure 1 As shown, the attachment tape 30 can be provided on the first region R1 and the second region R2 in a manner that straddles one end 11 of the packaging sheet 10. By providing the attachment tape 30, when the individually packaged absorbent article 100 is unsealed, the user can hold the attachment tape 30 and lift and pull the first region R1, so that unsealing becomes easier. At this time, the first region R1 is peeled off from the second region R2 located below it.

[0054] <Seal section>

[0055] like Figure 1 As shown, in the individually packaged absorbent article 100, the regions where the absorbent article 1 is not present at both edge portions in the short side direction D2 are sealed to form sealed portions 15. In this embodiment, the sealed portions 15 are formed by passing the folded packaging sheet 10 between a pair of heated rollers to press the packaging sheets 10 together in the thickness direction.

[0056] like Figure 1 As shown, the seal portion 15 is formed, for example, over the entire length of the long side direction D1 of the individually packaged absorbent article 100. This is preferable from the viewpoint of preventing debris and dust, or fingers or small objects from inadvertently entering from the short side edge (sealing can be achieved).

[0057] The range of the short side direction D2 in which the sealing portion 15 is provided is, for example, the range from the end edge of the short side direction D2 to 20 mm inward. The sealing portion 15 may be formed in the entire above range, or may be formed in a part of the above range, for example, at a position away from the end edge of the short side direction D2 inward. The length (width) of the short side direction D2 of the sealing portion 15 itself is preferably 3 to 15 mm. The inner edge of the short side direction D2 of the sealing portion 15 may extend linearly along the long side direction D1, or may extend in a curved shape, such as a wave shape.

[0058] Figure 4 yes Figure 1 The enlarged view of the portion II shown shows a portion including the sealing portion 15 .

[0059] like Figure 4 As shown, the sealing portion 15 includes, for example, a plurality of crimping portions (or joining portions) 15a that are separated from each other when viewed from above. Each crimping portion 15a is a portion where the packaging sheets 10 are joined together in the thickness direction by crimping. In the illustrated example, portions other than the plurality of crimping portions 15a become non-joined portions where the packaging sheets 10 are not joined together. In this way, by utilizing the plurality of crimping portions 15a to be separated and dispersed from each other, for example, compared to a case where the packaging sheets 10 are joined together continuously over the entire surface of the sealing portion 15, the packaging sheets can be easily peeled off from each other during unsealing, thereby improving the unsealing properties. In addition, it is also possible to prevent the two edges of the individually packaged absorbent article 100 from becoming excessively hardened and damaging the touch of the skin.

[0060] It should be noted that the top view shape of each crimping portion 15a is Figure 4 The example shown is a square, but the shape is not limited to the one shown in the figure, and may be, for example, a quadrilateral other than a square such as a rectangle, a parallelogram, a polygon other than a quadrilateral, a circle, an ellipse, a heart shape, a star shape, a drop shape, etc. In addition, the size of each crimping portion 15a may be, for example, a square with a side length of 0.25 to 2.5 mm, or a size having an area equivalent thereto.

[0061] <Manufacturing process of individually packaged absorbent articles>

[0062] Figure 5 It is used to illustrate Figures 1 to 4 The illustrated flowchart is a process for manufacturing a packaged product in which the individually packaged absorbent article 100 is housed in a package.

[0063] When manufacturing the individually packaged absorbent article 100 configured as described above, first, in step S1, printing is performed on the packaging sheet 10. The printing on the packaging sheet 10 is performed on the exposed surface of the packaging sheet 10 after the absorbent article 1 is individually packaged.

[0064] Here, as described above, when printing is performed on the packaging sheet 10 to improve the design of the individually packaged absorbent article 100, a paper with high printability is considered to be used as the packaging sheet 10. Here, a paper with high surface smoothness and slipperiness is considered to be used as the paper with high printability.

[0065] Therefore, for various papers that can be considered as packaging sheets 10, MMD (variation of mean friction coefficient) as an index of smoothness of the paper surface was measured to test whether the printability was high. It should be noted that in this experiment, MMD was measured using a KES friction tester. As the measurement conditions at this time, a terminal wound with piano wire was used as the terminal, and a load of 50g was applied while sliding along the surface at a speed of 1mm / sec for a distance of 30mm.

[0066] [Table 1]

[0067]

[0068] As shown in Table 1, as Example 1, the smooth surface of chemical fiber paper PM (manufactured by Maruhi Paper Technology Co., Ltd.) with a basis weight of 14 gsm was measured. In addition, as Example 2, the rough surface of chemical fiber paper PM (manufactured by Maruhi Paper Technology Co., Ltd.) with a basis weight of 14 gsm was measured. In addition, as Example 3, the smooth surface of Yunlong paper (manufactured by Maruhi Paper Technology Co., Ltd.) with a basis weight of 17 gsm was measured. In addition, as Example 4, the rough surface of Yunlong paper (manufactured by Maruhi Paper Technology Co., Ltd.) with a basis weight of 17 gsm was measured. In addition, as Example 5, the smooth surface of Kinshashi paper (manufactured by Daio Paper Co., Ltd.) with a basis weight of 24.4 gsm was measured. In addition, as Example 6, the rough surface of Kinshashi paper (manufactured by Daio Paper Co., Ltd.) with a basis weight of 24.4 gsm was measured. Furthermore, as Comparative Example 1, the smooth surface of crepe paper (manufactured by Daio Paper Co., Ltd.) having a basis weight of 18 gsm was measured. The chemical fiber paper PM is a paper composed of 15% of rayon and 85% of pulp.

[0069] Thus, the MMD in Comparative Example 1 was 0.052. In addition, the MMD in Example 1 was 0.011, and the MMD in Example 2 was 0.017. In addition, the MMD in Example 3 was 0.014, and the MMD in Example 4 was 0.021. In addition, the MMD in Example 5 was 0.008, and the MMD in Example 6 was 0.013. It should be noted that the paper in Comparative Example 1 had a wrinkled surface, so it was a paper with low smoothness.

[0070] In Table 1, as printability, "×" is indicated for those where the ink did not adhere uniformly to the printed surface, resulting in white spots, i.e., so-called missing prints, and "O" is indicated for those where no missing prints occurred. As shown in Table 1, missing prints occurred in Comparative Example 1, but no missing prints occurred in Examples 1 to 6. In addition, in Comparative Example 1, it was observed that the surface tended to wrinkle easily after printing, which is considered to be related to the occurrence of missing prints.

[0071] From this result, as the packaging sheet 10, paper having an MMD of 0.050 or less on the surface before printing has printability, and by using this paper, printing can be performed on the surface of the packaging sheet 10 to improve the design.

[0072] After printing is applied to the packaging sheet 10 , the absorbent article 1 is placed on the packaging sheet 10 , and the packaging sheet 10 is rolled into three (inwardly folded) together with the absorbent article 1 so that the printed surface is exposed on the surface to wrap the absorbent article 1 .

[0073] Then, in step S2 , both edge portions in the short-side direction D2 of the individually wrapped absorbent article 100 are sealed along the long-side direction D1 , respectively, to form the sealed portions 15 .

[0074] It should be noted that the steps of printing the packaging sheet 10, wrapping the absorbent article 1 in the packaging sheet 10, and forming the sealing portion 15 can also be performed when the packaging sheet 10 is in a long strip. In this case, after the sealing portion 15 is formed, the packaging sheet 10 is cut into individual pieces to form a form of individually packaged absorbent articles 100.

[0075] The individually packaged absorbent articles 100 manufactured in this manner are then housed in a package in step S3 , and a packaged product in which the individually packaged absorbent articles 100 are housed in the package is completed (step S3 ).

[0076] Figure 6 yes Figures 1 to 4 The figure shows a state where the individually packaged absorbent article 100 is accommodated in a package.

[0077] like Figure 6As shown, the individually packaged absorbent articles 100 manufactured in this manner are stored in a package in a state where a plurality of individually packaged absorbent articles 100 are overlapped. At this time, when a paper with high smoothness and high printability is used as the packaging sheet 10, the individually packaged absorbent articles 100 are easy to slip relative to each other. Therefore, on the conveyor line that conveys the individually packaged absorbent articles 100, the overlapping individually packaged absorbent articles 100 will spread out. In particular, they are easy to spread out in the fiber direction of the paper. Here, the process of storing the individually packaged absorbent articles 100 in the package as described above can also be automatically performed on the conveyor line. Therefore, if the overlapping individually packaged absorbent articles 100 are scattered, the scattered individually packaged absorbent articles 100 must be stored in the package by manual operation, thereby reducing production efficiency.

[0078] Therefore, for various papers that can be used as packaging sheets 10, the static friction coefficient between the printed papers was measured, and an experiment was conducted to see whether the papers would come apart when inserted into a package. It should be noted that in this experiment, the static friction coefficient was measured using a Tribo friction tester. The measurement conditions at this time were: a 2 cm × 2 cm paper sheet was moved at a speed of 43 mm / sec while applying a load of 70 g to a distance of 50 mm.

[0079] [Table 2]

[0080]

[0081] As shown in Table 2, as Comparative Example 1, the rough surface of chemical fiber paper PM with a basis weight of 14 gsm was measured. In addition, as Comparative Example 2, the smooth surface of Yunlong paper with a basis weight of 17 gsm was measured. In addition, as Example 1, the rough surface of Yunlong paper with a basis weight of 17 gsm was measured.

[0082] Therefore, the static friction coefficient in Comparative Example 1 was 0.577, and the static friction coefficient in Comparative Example 2 was 0.562. On the other hand, the static friction coefficient in Example 1 was 0.603.

[0083] In Table 2, those that were scattered when the packet was inserted were marked with "×", and those that were not scattered were marked with "0". As shown in Table 2, in Comparative Examples 1 and 2, the scattered was generated, but in Example 1, the scattered was not generated.

[0084] According to the results, if the static friction coefficient between the exposed surfaces of the printed paper is 0.60 or more, when a plurality of individually packaged absorbent articles 100 are stacked and stored in a package, they are less likely to be scattered due to slippage. This can avoid a decrease in production efficiency when the individually packaged absorbent articles 100 are stored in a package. In addition, the appearance and skin feel are less likely to give people a cheap impression.

[0085] Here, the relationship between the ease of sliding between the individually packaged absorbent articles 100 described above and the blending ratio of the regenerated fiber will be described.

[0086] The static friction coefficient between various papers that can be considered as packaging sheets 10 was measured, and an experiment was conducted to determine whether the proportion of recycled fiber affects the unraveling of the paper when inserted into the package. It should be noted that in this experiment, the static friction coefficient was measured using a Tribo friction tester. The measurement conditions at this time were: a 2 cm × 2 cm paper sheet was moved at a speed of 43 mm / sec while applying a load of 70 g to a distance of 50 mm.

[0087] [Table 3]

[0088]

[0089] As shown in Table 3, as Comparative Example 1, the rough surface of chemical fiber paper PM with a basis weight of 14 gsm was measured. In addition, as Example 1, the rough surface of Yunlong paper with a basis weight of 17 gsm was measured. At this time, in Comparative Example 1, the mixing ratio of the regenerated fiber was 15%; in Example 1, the mixing ratio of the regenerated fiber was 20-25%.

[0090] Therefore, the static friction coefficient in Comparative Example 1 is 0.577. On the other hand, the static friction coefficient in Example 1 is 0.603.

[0091] In Table 3, those that were loosened when inserted into the package were marked with "×", and those that were not loosened were marked with "○". As shown in Table 3, the rough surface of the chemical fiber paper PM of Comparative Example 1 was loosened, while the rough surface of the Yunlong paper of Example 1 was not loosened.

[0092] According to the results, if the packaging sheet 10 is made of paper with a recycled fiber blending ratio of 20% or more, when a plurality of individually packaged absorbent articles 100 are stacked and stored in a package, they are less likely to fall apart due to slippage. This can avoid a decrease in production efficiency when the individually packaged absorbent articles 100 are stored in a package.

[0093] Here, the relationship between the ease of sliding between the individually wrapped absorbent articles 100 described above and the fiber bundle of paper will be described.

[0094] As mentioned above, for Yunlong paper, the static friction coefficient between its paper is large and not easy to slip. Here, Yunlong paper is owing to comprising the fiber bundle that the artificial fiber is twisted into a string shape and forms a bundle, so the concavoconvexity on the surface becomes large.

[0095] Thus, for paper containing fiber bundles, the static friction coefficient becomes larger because the surface concavity and convexity become larger. Therefore, by using paper containing fiber bundles for the packaging sheet 10, not limited to Yunlong paper, after printing, when the individually packaged absorbent articles 100 are overlapped and stored in a package, slippage is not likely to occur.

[0096] It should be noted that in the above-mentioned embodiment, Yunlong paper is described as a paper with special effects, but it is not limited to Yunlong paper. As long as the MMD of the exposed surface before printing is less than 0.050 and the static friction coefficient between the exposed surfaces of multiple individually packaged absorbent articles after printing is greater than 0.60, the effect of the present invention can be obtained.

[0097] The present invention has been described above based on the embodiments, but the present invention is not limited to these embodiments. Within the scope of the claims, various changes, corrections, substitutions, additions, deletions and combinations can be made to the above embodiments, which also fall within the technical scope of the present invention. In addition, the above constituent elements can be combined arbitrarily.

[0098] This application claims the benefit of Japanese Patent Application No. 2023-055946 filed on March 30, 2023, the entire contents of which are incorporated herein by reference.

[0099] Description of Reference Numerals

[0100] 1. Absorbent articles

[0101] 3 Top sheet

[0102] 4 Absorber

[0103] 7 Side panels

[0104] 10 Packaging Tablets

[0105] 11 One end of the long side

[0106] 12 The other end of the long side

[0107] 15 Sealing part

[0108] 15a Crimping part (joining part)

[0109] 30 Attachment tape

[0110] 100 Individually wrapped absorbent articles

[0111] D1 Long side direction of the packaging sheet

[0112] D2 Short side direction of the packaging sheet

[0113] F1 1st fold line

[0114] F2 2nd fold line

[0115] R1 Area 1

[0116] R2 Area 2

[0117] R3 Area 3.

Claims

1. An individually packaged absorbent article, wherein the absorbent article is individually packaged with a paper packaging sheet, wherein: The packaging sheet has a printed surface that is exposed when the absorbent article is individually packaged. The MMD of the exposed surface before printing is 0.050 or less, and the static friction coefficient between the exposed surfaces of the plurality of individually packaged absorbent articles after printing is 0.60 or more.

2. The individually packaged absorbent article according to claim 1, wherein The packaging sheet contains recycled fibers in an amount of 20% or more.

3. The individually packaged absorbent article according to claim 1, wherein: The packaging sheet comprises a fiber bundle.

4. A method for manufacturing a packaged product, wherein the packaged product is formed by storing the individually packaged absorbent article according to any one of claims 1 to 3 in a package, the method comprising the following steps: Printing the packaging sheet; placing the absorbent article on the packaging sheet, and folding the packaging sheet so as to wrap the absorbent article in a manner that the printed surface is exposed on the surface, thereby manufacturing the individually packaged absorbent article; and A plurality of the individually packaged absorbent articles are stacked and stored in a package.

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