Individual packaging body for absorbent pad

Abstract

To provide an individual packaging body for an absorbent pad which is excellent in wearing feeling, does not cause an adhesive failure of a tab tape and a break of an individual packaging sheet in opening, and is easy to open when an absorbent pad using a super absorbent polymer (SAP) sheet as an absorber is individually packaged by folding in three in a front-back direction and in a right-left direction with the individual packaging sheet of a film.SOLUTION: An individual packaging body 10 for an absorbent pad is formed by folding both sides in a width direction of an individual packaging sheet 30 to the inside in the width direction to fold in three, folding both sides in a longitudinal direction of an absorbent pad and the individual packaging sheet 30 to the inside in the longitudinal direction to fold in three, and by sealing with a tab tape 40. An absorber of the absorbent pad is a super absorbent polymer (SAP) sheet which does not include fluff pulp, and the individual packaging sheet includes a film. A compression recovery ratio RC of the absorbent pad in a folded state in a KES compression test is 30% or more and 60% or less. A value (%) expressed by a formula: (tensile modulus of the individual packaging sheet)÷(tensile modulus of the tab tape)×100 is 5% or more and 50% or less.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to individually packaged absorbent pads. [Background technology]

[0002] Absorbent pads such as light incontinence pads, which are composed of a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the two sheets, are generally individually wrapped by folding the pads front to back or left to right using an individual wrapping sheet and sealing them with tab tape. The material of the individual wrapping sheet used in this case is a nonwoven fabric or a film.

[0003] However, users of absorbent pads do not want others to know that they are using an absorbent pad. For this reason, there is a demand for products that are less noticeable when carried around, such as the individually packaged absorbent article described in Patent Document 1, which is folded up small using a film as an individual packaging sheet. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4492962 Summary of the Invention [Problem to be solved by the invention]

[0005] However, absorbent pads that use a film for the individual wrapping sheet and are folded in three each in the front, back, left and right directions have the problem that poor adhesion of the tab tape is likely to occur during manufacturing. In particular, it has been found that when a so-called SAP sheet that does not contain flap pulp and is composed of a nonwoven fabric and a superabsorbent polymer (SAP) is used as the absorbent body of the absorbent pad, the rigidity of the folded absorbent pad is insufficient, and thus poor adhesion of the tab tape becomes prominent.

[0006] Changing the adhesive of the tab tape to improve its adhesive strength improves the adhesion failure, but this then causes problems such as the individual wrapping sheet tearing or difficulty in opening when opening the absorbent pad. Increasing the thickness of the film of the individual wrapping sheet can improve adhesion failure and tearing of the individual wrapping sheet, but this is costly and less economical. In addition, increasing the rigidity of the absorbent pad allows the tab tape to be affixed stably, but this causes a problem of a decrease in comfort when worn.

[0007] Thus, when a film is used for the individual packaging sheet of a small folded SAP sheet-type absorbent pad, it has been difficult to provide an excellent wearing comfort and to improve poor adhesion of the tab tape and tearing of the individual packaging sheet when opened.

[0008] Therefore, an object of the present disclosure is to provide an individually packaged absorbent pad that is comfortable to wear, does not have poor adhesion of the tab tape, and is easy to open without tearing of the individually packaged sheet when opened, even when an absorbent pad using a SAP sheet as an absorbent is individually packaged by folding it in three front to back and in three left to right with an individually packaged film sheet. [Means for solving the problem]

[0009] In order to solve the above problems, a first aspect of the present invention is an individually packaged absorbent pad comprising an absorbent pad and an individually packaged sheet for packaging the absorbent pad, wherein both widthwise side regions of the individually packaged sheet are folded inward in the widthwise direction to cover the absorbent pad, folded in thirds, and both longitudinal sides of the absorbent pad and the individually packaged sheet are folded inward in the longitudinal direction, folded in thirds, and sealed with a tab tape, wherein the absorbent pad comprises a liquid-permeable top sheet, a liquid-impermeable back sheet, and and an absorbent body disposed between the tab tape and the back sheet, the absorbent body being an SAP sheet having a nonwoven fabric sheet and a highly absorbent polymer fixedly supported on the nonwoven fabric sheet and not containing fluff pulp, the individually wrapped sheet including a film, the compression recovery rate RC of the absorbent pad in a folded state in a KES compression test being 30% or more and 60% or less, and the value (%) represented by the formula: (tensile modulus of elasticity of the individually wrapped sheet) ÷ (tensile modulus of elasticity of the tab tape) × 100 being 5% or more and 50% or less.

[0010] A second aspect of the present invention is the individually packaged absorbent pad of the first aspect, wherein the absorbent pad has a transfer sheet disposed between the top sheet and the absorbent body, and the sum of the basis weight of the top sheet and the basis weight of the transfer sheet is 30 g / m 2 More than 70g / m 2 The following is the result.

[0011] A third aspect of the present invention is the individually wrapped absorbent pad of the first aspect or the second aspect, wherein the individually wrapped sheet has a tensile modulus of elasticity of 3 MPa or more and 7 MPa or less.

[0012] A fourth aspect of the present invention is the individually packaged absorbent pad according to the first aspect or the second aspect, wherein the tensile modulus of elasticity of the tab tape is 15 MPa or more and 70 MPa or less.

[0013] A fifth aspect of the present invention is the individually packaged absorbent pad of the first aspect or the second aspect, wherein the adhesive strength between the tab tape and the individually packaged sheet is 100 gf or more and 350 gf or less.

[0014] A sixth aspect of the present invention is an individually packaged absorbent pad according to the first aspect or the second aspect, which has a KES compression test of 50 gf / cm 2 The thickness of the absorbent pad under load is 1.5 mm or more and 3.5 mm or less. Effect of the Invention

[0015] According to the present disclosure, even when an absorbent pad using a SAP sheet as an absorbent body is individually wrapped by folding it in three from front to back and in three from left to right with an individual wrapping sheet of film, it is possible to provide an individually wrapped absorbent pad that is comfortable to wear, does not suffer from poor adhesion of the tab tape, and is easy to open without tearing of the individual wrapping sheet when opened. [Brief description of the drawings]

[0016] [Figure 1] 1A and 1B are external views of an individually wrapped absorbent pad according to one embodiment of the present invention, in which (a) shows a state viewed from the front in the thickness direction, and (b) shows a state viewed from the side. [Diagram 2] FIG. 2 is a development view of the individually wrapped absorbent pad of FIG. 1. [Diagram 3] FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2. [Figure 4] 13 is a plan view of the absorbent pad from the skin side showing a modified embossing pattern. FIG. [Diagram 5] FIG. 13 is an explanatory diagram showing a process for individually packaging absorbent pads. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an individually packaged absorbent pad 10 according to one embodiment of the present invention will be described with reference to the drawings.

[0018] In this specification, wearing an absorbent pad means a state in which the absorbent pad is worn, regardless of whether the absorbent pad is worn before, during, or after the absorption of bodily fluids (urine). The longitudinal direction means the longitudinal direction of the absorbent pad, which is the direction from the abdomen side of the wearer to the crotch when the absorbent pad is worn, and is the direction along the arrow X in the figure. The inner side of the longitudinal direction means the direction toward the center in the longitudinal direction, and the outer side of the longitudinal direction means the direction away from the center in the longitudinal direction. The width direction means the short side direction of the absorbent pad, which is the direction intersecting (orthogonal to) the longitudinal direction, and is the direction along the arrow Y in the figure. The inner side of the width direction means the direction toward the center in the width direction, and the outer side of the width direction means the direction away from the center in the width direction. The thickness direction means the direction in which each component is stacked, and is the direction along the arrow Z in the figure. In addition, the "skin side" refers to the direction toward the wearer's body when the absorbent pad is worn, and is the direction indicated by the arrow Z in the figure. In addition, the "non-skin side" refers to the direction opposite to the skin side in the thickness direction, and is the direction opposite to the direction indicated by the arrow Z in the figure. In addition, the left-right direction refers to the left-right direction as seen from the wearer facing forward when wearing the absorbent pad. Body fluids refer to liquids discharged from the body to the outside, such as urine, blood, and water in loose stools.

[0019] [Individually wrapped absorbent pads] FIG. 1 is an external view of an individually packaged absorbent pad according to one embodiment of the present invention, where (a) shows a state seen from the front in the thickness direction, and (b) shows a state seen from the side. FIG. 2 is a development view of the individually packaged absorbent pad of FIG. 1. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2. FIG. 4 is a plan view from the skin side showing a modified embossing pattern of the absorbent pad. FIG. 5 is an explanatory diagram showing a process of individually packaging an absorbent pad. Note that each drawing does not specify the size relationship of the components of the individually packaged absorbent pad, and the dimensions of each component can be appropriately selected from a wide range depending on the purpose of the absorbent pad, the age of the intended wearer, etc.

[0020] As shown in Figs. 1 to 3, the individually packaged absorbent pad 10 according to this embodiment includes an absorbent pad 20 and an individually packaged sheet 30 for individually packaging the absorbent pad 20. The individually packaged absorbent pad 10 is folded from the unpackaged state shown in Fig. 2, whereby the absorbent pad 20 is individually packaged with the individually packaged sheet 30 and sealed with a tab tape 40. Specifically, from the unpackaged state, the individually packaged sheet 30 is folded in thirds along the dashed line x1 shown in Fig. 5(a) and the dashed line x2 shown in Fig. 5(b), and then the absorbent pad 20 and the individually packaged sheet 30 are folded in thirds along the dashed line x3 shown in Fig. 5(c) and the dashed line x4 shown in Fig. 5(d). The folding method will be described in detail later.

[0021] [Absorbent pad] 2 and 3, the absorbent pad 20 can be used as various absorbent articles for babies, adults, and the elderly, including pad products such as sanitary napkins, panty liners, vaginal discharge sheets, light incontinence pads, light incontinence liners, urine pads, etc. The shape of the absorbent pad 20 is not particularly limited, but examples include an hourglass shape, a roughly rectangular shape, an oval shape, etc.

[0022] The absorbent pad 20 has a liquid-permeable top sheet 21, a liquid-impermeable back sheet 22, and an absorbent body 23 disposed between the top sheet 21 and the back sheet 22. In addition to these, the absorbent pad 20 of this embodiment has left and right three-dimensional gathers 24 on both sides in the width direction, and a transfer sheet 25 disposed between the top sheet 21 and the absorbent body 23.

[0023] (Top sheet) The top sheet 21 is a liquid-permeable sheet that is positioned on the skin side when worn, and is disposed opposite the back sheet 22 with the absorbent body 23 sandwiched therebetween. The top sheet 21 is a liquid-permeable sheet-like member, and may be formed from a substrate having liquid permeability that allows bodily fluids to move to the absorbent body 23. An example of the substrate is a hydrophilic sheet. Examples of hydrophilic sheets include air-through nonwoven fabrics, thermal bond nonwoven fabrics, spunlace nonwoven fabrics, spunbond nonwoven fabrics, and the like, which contain one or more of synthetic fibers made of synthetic resins such as polypropylene and polyethylene, regenerated fibers such as rayon, and natural fibers such as cotton.

[0024] The surface of the top sheet 21 may be embossed or perforated according to a known method in order to improve design and liquid permeability. The top sheet 21 may contain one or more of lotions, antioxidants, anti-inflammatory ingredients, pH adjusters, antibacterial agents, moisturizers, etc. in order to reduce irritation to the skin. The shape of the top sheet 21 is not particularly limited, and may be any shape that covers all or part of the absorbent body 23, which is necessary to guide bodily fluids to the absorbent body 23 without leakage. The basis weight of the top sheet 21 is 18 g / m 2 More than 35g / m 2 It is preferable that the basis weight is equal to or less than 1000 g / m2. By setting the basis weight of the top sheet 21 within the above range, it is easy to adjust the compression recovery rate RC of the absorbent pad 20 when it is individually packaged (hereinafter sometimes referred to as the "folded state"). The basis weight of the top sheet 21 is measured by peeling the top sheet 21 from the product (absorbent pad 20) and immersing the peeled top sheet 21 in a solvent (e.g., Finesolve (manufactured by Sankyo Chemical Industry Co., Ltd.)) to completely remove the hot melt adhesive. Thereafter, the top sheet 21 is air-dried, and the basis weight is calculated from the dimensions and weight of the air-dried top sheet 21.

[0025] (Back seat) The back sheet 22 is a liquid-impermeable sheet located on the non-skin side when worn, and may be formed using a liquid-impermeable substrate so that the body fluid held by the absorbent 23 does not leak to the non-skin side, and is formed from a material such as a resin film or a composite sheet in which a resin film and a nonwoven fabric are laminated. The nonwoven fabric used in the composite sheet is not particularly limited in its manufacturing method, and examples thereof include composite nonwoven fabrics in which multiple nonwoven fabrics of the same type and / or different types are laminated, such as spunbond nonwoven fabric, meltblown nonwoven fabric, spunbond nonwoven fabric / meltblown nonwoven fabric, spunbond nonwoven fabric / meltblown nonwoven fabric / spunbond nonwoven fabric, and composite materials thereof. Examples of the resin film include films of polyester, polyvinyl alcohol, polyethylene, polypropylene, etc., and composite films of polyethylene and polypropylene.

[0026] It is preferable that the back sheet 22 has breathability in order to prevent stuffiness during wearing. In order to provide the back sheet 22 with breathability, for example, a filler may be blended into the resin film of the base material, or the back sheet 22 may be embossed. An example of the filler is calcium carbonate, and the blending method may be any known method without limitation. For example, a porous (breathable) resin film can be obtained by kneading a resin and a filler, forming the resulting kneaded product into a film, and removing the filler from the resulting film.

[0027] (Absorbent) The absorbent body 23 is an SAP sheet that has a nonwoven fabric sheet and a superabsorbent polymer (hereinafter sometimes referred to as "SAP") fixed and supported on the nonwoven fabric sheet, and does not contain fluff pulp. For example, the absorbent body 23 is an SAP sheet that has SAP particles fixed and supported between two hydrophilic nonwoven fabric sheets and does not contain fluff pulp. The SAP particles may be fixed and supported on the nonwoven fabric sheet by a hot melt adhesive or the like. The absorbent body 23 may also be an SAP sheet that does not contain fluff pulp, and has SAP particles fixed and supported between three or more hydrophilic nonwoven fabric sheets by a hot melt adhesive or the like.

[0028] Examples of nonwoven fabric sheets include nonwoven fabrics such as air-through nonwoven fabrics, point-bonded nonwoven fabrics, spunbonded nonwoven fabrics, and melt-blown nonwoven fabrics, and composite nonwoven fabrics such as spunbonded nonwoven fabric / melt-blown nonwoven fabric laminates and spunbonded nonwoven fabric / melt-blown nonwoven fabric / spunbonded nonwoven fabric laminates.

[0029] The SAP is not particularly limited as long as it can absorb body fluids and prevent backflow, and examples thereof include polyacrylates, polyaspartates, (starch-acrylic acid) graft copolymers, (acrylic acid-vinyl alcohol) copolymers, (isobutylene-maleic anhydride) copolymers, and saponification products thereof. Among these, from the viewpoint of the absorption amount per weight, polyacrylates are preferred, polyacrylate alkali metal salts are more preferred, and sodium polyacrylate is even more preferred. The superabsorbent polymers can be used alone or in combination of two or more.

[0030] (Embossed) As shown in Fig. 4, the absorbent body 23 preferably has an embossment 26 on the skin side. The embossment 26 can be formed by a conventionally known method such as press processing. It is not necessary to provide the embossment 26 on the absorbent body 23.

[0031] 4(a), it is more preferable that the absorbent body 23 includes a vertical embossment 26a extending along the longitudinal direction at least in the center of the width direction of the absorbent body 23. Since the center of the width direction of the absorbent body 23 overlaps with the attachment position of the tab tape 40 when the absorbent pads 20 are individually wrapped in the individual wrapping sheets 30 and sealed with the tab tape 40, if the vertical embossment 26a is present in the center of the width direction of the absorbent body 23, the tab tape 40 can be stably attached.

[0032] As shown in Fig. 4(b) and Fig. 4(c), it is more preferable that the absorbent body 23 includes, in addition to the vertical embossment 26a, a horizontal embossment 26b extending from the vertical embossment 26a toward the outside in the width direction. As shown in Fig. 4(b), the horizontal embossment 26b may extend from the vertical embossment 26a toward the outside in the width direction along a direction perpendicular to the longitudinal direction. Alternatively, as shown in Fig. 4(c), the horizontal embossment 26b may extend from the vertical embossment 26a toward the outside in the width direction along a direction inclined to the longitudinal direction. In this way, if there is a horizontal embossment 26b extending from the vertical embossment 26a toward the outside in the width direction, folding is stabilized when individually packaged, so that return deformation of the folded absorbent pad 20 can be suppressed, and the tab tape 40 can be stably attached.

[0033] (Transfer sheet) The transfer sheet 25 is disposed between the top sheet 21 and the absorbent body 23, and quickly diffuses bodily fluids absorbed from the top sheet 21 side, thereby preventing bodily fluids absorbed in the absorbent body 23 from leaking out from the top sheet 21. As the transfer sheet 25, any liquid-permeable substrate can be used without any particular limitation. Examples of the transfer sheet 25 include nonwoven fabrics such as air-through nonwoven fabrics, thermal bonded nonwoven fabrics, and spunbonded nonwoven fabrics, composite nonwoven fabrics in which the same or different types of nonwoven fabrics such as thermal bonded nonwoven fabrics / spunbonded nonwoven fabrics are laminated, foamed films made of urethane foam, polyethylene foam, etc., and composite sheets which are laminates of two or more of these. The basis weight of the transfer sheet 25 is 15 g / m 2 More than 40g / m 2 It is preferable that the basis weight of the transfer sheet 25 is within the above range, thereby making it easy to adjust the compression recovery rate RC (described later) of the absorbent pad 20 in the folded state. The basis weight of the transfer sheet 25 is measured in the same manner as the basis weight of the top sheet 21 described above.

[0034] (Top sheet and transfer sheet basis weight) The total weight of the top sheet 21 and the transfer sheet 25 (hereinafter referred to as the "total weight") is 30 g / m 2 More than 70g / m 2 The total weight is preferably 30 g / m or less. 2 If the total basis weight is lower than 70 g / m, the absorbent pad 20 becomes too hard and the wearing comfort is poor. 2 If it is higher than 40 g / m, the compression recovery rate RC of the absorbent pad 20 in the folded state becomes too small, which tends to cause poor adhesion of the tab tape 40. 2 The upper limit of the above range of the total basis weight is preferably 60 g / m or more. 2 It is more preferable that:

[0035] (Compression recovery rate RC of absorbent pad) The compression recovery rate RC of the absorbent pad 20 in the folded state in the KES compression test (hereinafter referred to as the "compression recovery rate RC of the absorbent pad 20") is 30% or more and 60% or less. If the compression recovery rate RC of the absorbent pad 20 is lower than 30%, the absorbent pad 20 does not have an appropriate rebound when sealed with the tab tape 40, and adhesion failure is likely to occur. On the other hand, if the compression recovery rate RC of the absorbent pad 20 is higher than 60%, the absorbent pad 20 becomes too hard and the wearing comfort is poor. The compression recovery rate RC of the absorbent pad 20 can be adjusted by the basis weight and stiffness of the various nonwoven fabric sheets constituting the absorbent pad 20, the embossing pattern of the SAP sheet, and the like. The lower limit of the above range of the compression recovery rate RC of the absorbent pad 20 is preferably 35% or more. The upper limit of the above range of the compression recovery rate RC of the absorbent pad 20 is preferably 45% or less.

[0036] Here, the KES compression test refers to a test using a handy compression tester KES-G5 (manufactured by Kato Tech Co., Ltd.). The compression recovery rate RC of the absorbent pad 20 is measured by applying the pressure plate of the handy compression tester to the individually packaged absorbent pad 10 at the attachment position of the tab tape 40. In other words, the compression recovery rate RC of the absorbent pad 20 refers to the compression recovery rate RC of the absorbent pad 20 in a state where it is packaged in the individually packaged sheet 30 and folded (the absorbent pad 20 in a state where the individual packaged sheet 30 is included). The measurement conditions of the handy compression tester in this measurement are: force meter: 1 kg, measurement sensitivity: SENS2, compression speed: 0.02 cm / sec, and pressure area: 2.0 cm 2 (Circular, standard), compression load pressure 50gf / cm 2 It is.

[0037] (Absorbent pad thickness) KES compression test: 50gf / cm 2 The thickness of the absorbent pad 20 under load (hereinafter referred to as "50 gf / cm 2 The thickness of the absorbent pad 20 under load is preferably 1.5 mm or more and 3.5 mm or less. 2 If the thickness of the absorbent pad 20 under load is made lower than 1.5 mm, the compression recovery rate RC of the absorbent pad 20 in the folded state becomes too small, and adhesion failure of the tab tape 40 is likely to occur. 2 If the thickness of the absorbent pad 20 under load is made greater than 3.5 mm, the wearing comfort will be inferior. The thickness of the absorbent pad 20 can be adjusted by the basis weight of the nonwoven fabric sheet, the amount of SAP applied, the embossing pattern, etc. 2 The lower limit of the above range of the thickness of the absorbent pad 20 under load is more preferably 2.0 mm or more. 2 The upper limit of the above range of the thickness of the absorbent pad 20 under load is more preferably 3.0 mm or less.

[0038] 50gf / cm 2The thickness of the absorbent pad 20 under load is measured using the above-mentioned handy compression tester by applying a pressure plate to the center of the absorbent pad 20 in an unfolded state (the state of the absorbent pad 20 shown in FIG. 2). The measurement conditions of the above-mentioned handy compression tester in this measurement are the same as the measurement conditions for the compression recovery rate RC of the absorbent pad 20.

[0039] [Individually wrapped sheets] 2 and 3, the individual packaging sheet 30 is a sheet-like member for individually packaging the absorbent pad 20. The length of the individual packaging sheet 30 in the longitudinal direction is longer than the length of the absorbent pad 20 in the longitudinal direction. In addition, the length of the individual packaging sheet 30 in the width direction is longer than the length of the absorbent pad 20 in the width direction.

[0040] The individual packaging sheet 30 includes a resin film. Examples of the resin film include films of polyester, polyvinyl alcohol, polyethylene, polypropylene, and the like, and composite films of polyethylene and polypropylene. The individual packaging sheet 30 is preferably made of a resin film, and more preferably made of a polyethylene film.

[0041] The individually wrapped sheet 30 is preferably silicone-coated on the surface (at least one surface) that will be the inner surface when individually wrapped. The absorbent pad 20 is preferably releasably attached to the silicone-coated surface of the individually wrapped sheet 30 by an adhesive layer provided on the non-skin side 20a.

[0042] (Thickness of individual packaging sheet) The thickness of the individual packaging sheet 30 is preferably 20 μm or more and 40 μm or less. By setting the thickness of the individual packaging sheet 30 within the above range, the absorbent pad 20 can be easily folded when individually packaging, and poor adhesion of the tab tape 40 can be suppressed. The thickness of the individual packaging sheet 30 can be measured in accordance with JIS K 7130:1999.

[0043] (Tensile modulus of individual packaging sheet) The tensile modulus of the individual packaging sheet 30 is preferably 3 MPa or more and 7 MPa or less. If the tensile modulus of the individual packaging sheet 30 is lower than 3 MPa, the individual packaging sheet 30 may be torn when the tab tape 40 is opened. On the other hand, if the tensile modulus of the individual packaging sheet 30 is higher than 7 MPa, it is difficult to fold compactly, and poor adhesion of the tab tape 40 is likely to occur. The lower limit of the above range of the tensile modulus of the individual packaging sheet 30 is more preferably 3.5 MPa or more. The upper limit of the above range of the tensile modulus of the individual packaging sheet 30 is more preferably 6.5 MPa or less.

[0044] The tensile modulus of elasticity of the individual packaging sheet 30 was measured by pulling the individual packaging sheet 30 in the longitudinal direction (arrow X direction) using a Tensilon tensile tester. The length of the individual packaging sheet 30 in the width direction was set to 50 mm, and the pulling speed was set to 300 mm / min.

[0045] (Printing area ratio of individual packaging sheets) The individual packaging sheet 30 may be printed with a design such as a figure, pattern, letter, or design. When the individual packaging sheet 30 is printed, the ratio of the area of ​​the printed portion to the entire individual packaging sheet 30 (hereinafter referred to as the "printed area ratio of the individual packaging sheet 30") is preferably 70% or more and 100% or less. If the printed area ratio of the individual packaging sheet 30 is less than 70%, poor adhesion of the tab tape 40 is likely to occur due to the difference in surface properties between the printed area and the unprinted area.

[0046] (How to fold) Next, a folding method for individually packaging the absorbent pad 20 in the individual packaging sheet 30 will be described with reference to Fig. 5. Fig. 5(a) shows a state in which the absorbent pad 20 is placed on the individual packaging sheet 30, Fig. 5(b) shows a state in which one widthwise side of the individual packaging sheet 30 is folded inward, Fig. 5(c) shows a state in which the other widthwise side of the individual packaging sheet 30 is folded inward, Fig. 5(d) shows a state in which one longitudinal side of the absorbent pad 20 and the individual packaging sheet 30 is folded inward, and Fig. 5(e) shows a state in which the other longitudinal sides of the absorbent pad 20 and the individual packaging sheet 30 are folded inward.

[0047] As shown in Fig. 5(a), in order to obtain an individually packaged absorbent pad 10 (see Figs. 1 and 5(e)) by individually packaging an absorbent pad 20 with an individual packaging sheet 30, first, the absorbent pad 20 is placed at the center in the longitudinal and width directions of the individual packaging sheet 30. As a result, the non-skin side of the absorbent pad 20 is completely covered by the individual packaging sheet 30 from the non-skin side.

[0048] Next, as shown by the outline arrow in Fig. 5(a), the region 30a on one side in the width direction of the individual packaging sheet 30 (the left side in the figure) is folded inward in the width direction (the right side in the figure) along the longitudinal direction, for example, at the position shown by the dashed line x1 in Fig. 5(a). In this state, as shown in Fig. 5(b), the region 30a on one side in the width direction of the individual packaging sheet 30 covers at least a part of the absorbent pad 20 from the skin side. Note that the position of the dashed line x1, which is the fold, is not limited to the position shown in Fig. 5(a), and may be, for example, a position on the inside in the width direction of the edge on one side in the width direction of the absorbent pad 20 (for example, a position along the edge on one side in the width direction of the absorbent body 23).

[0049] Next, as shown by the outline arrow in Fig. 5(b), the region 30b on the other side in the width direction of the individual packaging sheet 30 (the right side in the figure) is folded inward in the width direction (the left side in the figure) along the longitudinal direction at the position shown by the dashed line x2 in Fig. 5(b). In this state, as shown in Fig. 5(c), the region 30b on the other side in the width direction of the individual packaging sheet 30 overlaps the region 30a on one side from the skin side (outside in the thickness direction), and the individual packaging sheet 30 is folded in three in the width direction. That is, the regions 30a, 30b on both sides in the width direction of the individual packaging sheet 30 are folded in three to cover the absorbent pad 20. Then, as shown in Fig. 5(c), the skin side of the absorbent pad 20 is completely covered from the skin side by the regions 30a, 30b on both sides in the width direction of the individual packaging sheet 30. The opposing surfaces of the region 30a on one side and the region 30b on the other side in the width direction of the individual packaging sheet 30 are bonded to each other by a sealing adhesive 31 (e.g., a hot melt adhesive) applied to at least one of them. In this embodiment, as shown in FIG. 5(b), the sealing adhesive 31 is applied to the region 30a on one side, but it may be applied to the region 30b on the other side. The position of the dashed dotted line x2 that becomes the fold is not limited to the position shown in FIG. 5(b), and may be, for example, a position inside the edge on the other side in the width direction of the absorbent pad 20 (e.g., a position along the edge on the other side in the width direction of the absorbent body 23).

[0050] Next, as shown by the outline arrow in Fig. 5(c), a region 11 (hereinafter referred to as "package inner region 11") on one side (lower side in the figure) of the absorbent pad 20 and the individual packaging sheet 30 in the longitudinal direction is folded inward in the longitudinal direction (upper side in the figure) along the width direction, for example, at the position shown by the dashed line x3 in Fig. 5(c). Note that the package inner region 11 refers to a region located inside in the thickness direction of a package outer region 12 described later, among the folded regions on both sides in the longitudinal direction of the absorbent pad individual packaging body 10.

[0051] Next, as shown by the outline arrow in Fig. 5(d), the region 12 (hereinafter referred to as "package outer region 12") on the other side (upper side in the figure) of the absorbent pad 20 and the individual packaging sheet 30 in the longitudinal direction is folded inward in the longitudinal direction (lower side in the figure) along the width direction, for example, at the position shown by the dashed line x4 in Fig. 5(d). That is, both longitudinal sides of the absorbent pad 20 and the individual packaging sheet 30 are folded inward in the longitudinal direction to be folded in three. The package outer region 12 means a region located outside the package inner region 11 in the thickness direction among the folded regions on both longitudinal sides of the absorbent pad individual packaging body 10. That is, the package outer region 12 overlaps the package inner region 11 from the outside in the thickness direction.

[0052] Finally, as shown in Fig. 5(e), the outer region 12 of the package is adhered and sealed to the inner region 11 of the package with a tab tape 40. This allows for obtaining an individually packaged absorbent pad 10 in which the absorbent pad 20 is individually packaged with the individual packaging sheet 30, as shown in Fig. 5(e).

[0053] (Tab Tape) The tab tape 40 is not particularly limited, but is, for example, a tape in which an adhesive is applied to one surface of a base material that is a resin film. The length of the tab tape 40 in the width direction is preferably 5 mm or more and 20 mm or less.

[0054] As shown in Fig. 1 and Fig. 5(e), the tab tape 40 is located at the center in the width direction of the individual packaging sheet 30 of the absorbent pad individual packaging body 10. The tab tape 40 has a first adhesive region 41 that is adhered to the individual packaging sheet 30 in the package outer region 12, a second adhesive region 42 that is adhered to the individual packaging sheet 30 in the package inner region 11, and a non-adhesive region 43 (region below the two-dot chain line in Fig. 1(a)) provided at the tip of the second adhesive region 42 side in the longitudinal direction (upper side in the figure). The first adhesive region 41 is substantially the entire region of the tab tape 40 that faces the package outer region 12. The second adhesive region 42 is a part of the region of the tab tape 40 that faces the package inner region 11. The non-adhesive region 43 is a region of the tab tape 40 that faces the package inner region 11 and is not adhered to the individual packaging sheet 30 in the package inner region 11. The non-adhesive region 43 functions as a tab when peeling the tab tape 40 from the individual wrapping sheet 30 in the inner region 11 of the package.

[0055] (Area of ​​tab tape applied) The area of ​​the second adhesive region 42 of the tab tape 40 that is adhered to the individual wrapping sheet 30 in the inner region 11 of the package (hereinafter referred to as the "adhesive area of ​​the tab tape 40") is 50 mm 2 More than 400mm 2 By setting the application area of ​​the tab tape 40 within the above range, it is easy to adjust poor adhesion of the tab tape 40 and problems with opening the package.

[0056] (Adhesive strength of tab tape) The adhesive strength between the tab tape 40 and the individual wrapping sheet 30 (hereinafter simply referred to as "adhesive strength of the tab tape 40") is preferably 100 gf or more and 350 gf or less. If the adhesive strength of the tab tape 40 is less than 100 gf, the compression recovery rate RC of the absorbent pad 20 in the folded state becomes too small, and poor adhesion of the tab tape 40 is likely to occur. On the other hand, if the adhesive strength of the tab tape 40 is greater than 350 gf, the individual wrapping sheet 30 is likely to tear when opened, and is difficult to open. The adhesive strength of the tab tape 40 can be adjusted by the coating amount and material of the adhesive of the tab tape 40. The lower limit of the above range of the adhesive strength of the tab tape 40 is more preferably 150 gf or more. The upper limit of the above range of the adhesive strength of the tab tape 40 is more preferably 300 gf or less.

[0057] The adhesive strength of the tab tape 40 is measured using a Tensilon tensile tester. For example, the tab tape 40 of the product (individually packaged absorbent pad 10) is attached directly to one (e.g., upper) chuck part of the Tensilon tensile tester, or the tab tape 40 is indirectly attached via a gripping tab attached to the tab tape 40. The individually packaged sheet 30 of the product on the package inner region 11 side is attached to the other (e.g., lower) chuck part of the Tensilon tensile tester. Then, the maximum load point is measured with a tensile speed of 300 mm / min by the Tensilon tensile tester, and the measured value is regarded as the adhesive strength of the tab tape 40.

[0058] (Tensile modulus of tab tape) The tensile modulus of the tab tape 40 is preferably 15 MPa or more and 70 MPa or less. If the tensile modulus of the tab tape 40 is lower than 15 MPa, the tab tape 40 may stretch when opening the tab tape 40, making it difficult to open the tab tape 40. On the other hand, if the tensile modulus of the tab tape 40 is higher than 70 MPa, the individual wrapping sheet 30 is more likely to tear when opening the tab tape 40. The lower limit of the above range of the tensile modulus of the tab tape 40 is more preferably 30 MPa or more. The upper limit of the above range of the tensile modulus of the tab tape 40 is more preferably 40 MPa or less.

[0059] The tensile modulus of the tab tape 40 was measured by pulling the tab tape 40 in the longitudinal direction (arrow X direction) using a Tensilon tensile tester. The length in the width direction of the tab tape 40 was the product width, and the measurement was performed at a pulling speed of 300 mm / min. The measurement result of the product width was converted into a width direction length of 12 mm, and the converted value was regarded as the tensile modulus of the tab tape 40.

[0060] (Relationship between tensile modulus of individual packaging sheet and tab tape) The value A (%) represented by the following formula (1) is 5% or more and 50% or less. Value A = (tensile modulus of elasticity of individual packaging sheet 30) ÷ (tensile modulus of elasticity of tab tape 40) × 100 (1) If the value A is smaller than 5%, the individual wrapping sheet 30 is easily torn when opened. On the other hand, if the value A is greater than 50%, it becomes difficult to open. The value A can be adjusted by the thickness of the individual wrapping sheet 30 and the tab tape 40, the length of the tab tape 40 in the width direction, etc. The lower limit of the above range of the value A is preferably 10% or more.

[0061] Although the present invention has been described based on the above embodiment, the present invention is not limited to the contents of the above embodiment, and can be modified as appropriate without departing from the scope of the present invention. In other words, all other embodiments, examples, and operational techniques made by those skilled in the art based on this embodiment are naturally included in the scope of the present invention. EXAMPLES

[0062] The present invention will be described in detail below with reference to examples. However, the present invention is not limited to the examples shown below.

[0063] (Examples 1 to 14 and Comparative Examples 1 to 13) Individually packaged absorbent pads of Examples 1 to 14 and Comparative Examples 1 to 13 were prepared according to the conditions (parameters) shown in Tables 1 and 2. The individually packaged absorbent pads of Examples 1 to 14 and Comparative Examples 1 to 13 used SAP sheets as absorbents of the absorbent pads, and the absorbent pads were individually packaged by folding the absorbent pads in three in the front and back and three in the left and right in the folding manner described above with an individually packaged film sheet, and sealed with a tab tape. Then, the following four evaluations (evaluation of "film tear when opening", evaluation of "difficulty in opening when opening", evaluation of "poor adhesion of tab tape", and evaluation of "wearing comfort") were performed on each individually packaged absorbent pad. Each parameter was measured according to the above-mentioned standards or measurement methods. In Tables 1 and 2, "compression recovery rate RC of absorbent pad" is expressed as "compression recovery rate RC", "individually packaged sheet" is expressed as "film", and "absorbent pad" is expressed as "absorbent article".

[0064] (Film torn when opened) The evaluation of "film tearing when opening" was based on the tearing of the film (individually wrapped sheet) when the tab tape was peeled off, and the monitor opened 10 individually wrapped absorbent pads and evaluated the number of tears in the individually wrapped sheet. The evaluation was based on the following criteria. ○: The number of tears in the individual packaging sheet is 0 to 2 △: The number of tears in the individual packaging sheets is 3 to 5 ×: The number of tears in the individual packaging sheets is 6 to 10

[0065] (Difficulty in opening) The evaluation of "difficulty in opening" was a sensory evaluation by 30 monitors on the difficulty in opening (ease of opening) of the individually wrapped absorbent pads, in which each individually wrapped absorbent pad was opened and the difficulty in opening (ease of opening) was confirmed. The evaluation was performed according to the following criteria. ○: 21 to 30 people rated "easy to open" △: 11 to 20 people rated "easy to open" ×: 0 to 10 people rated "easy to open"

[0066] (Poor adhesion of tab tape) The "Tab tape adhesion failure" was evaluated by continuously producing 500 water absorbent pads and counting the number of occurrences of tab tape adhesion failure (peeling, lifting, and misalignment of the attachment position). Evaluation was performed according to the following criteria. ○: 0 to 10 adhesion defects △: The number of adhesion failures is 11 to 50 ×: 51 or more adhesion failures

[0067] (Wearing comfort) The "wearing comfort" evaluation was a sensory evaluation of the wearing comfort of the absorbent pads by 30 monitors. In this evaluation, each monitor tried on each absorbent pad and rated the wearing comfort with three options: "good," "average," and "bad." The evaluation was based on the following criteria: ○: 21 to 30 people rated "good" △: 11 to 20 people rated "good" ×: 0 to 10 people rated "good"

[0068] The results obtained are shown in Tables 1 and 2.

[0069] [Table 1]

[0070] [Table 2]

[0071] As described above, from Tables 1 and 2, it has been confirmed that, according to the present disclosure, even when an absorbent pad using a SAP sheet as an absorbent body is individually wrapped by folding it in three from front to back and in three from left to right with an individual wrapping sheet of film, it is possible to provide an individually wrapped absorbent pad that is comfortable to wear, does not suffer from poor adhesion of the tab tape, and is easy to open without tearing of the individual wrapping sheet when opened. [Explanation of symbols]

[0072] 10: Individually packaged absorbent pads 20:Absorbent pad 21: Top sheet 22: Back seat 23: Absorbent 25: Transfer sheet 30: Individually wrapped sheets 40: Tab tape

Claims

1. An individually packaged absorbent pad comprising an absorbent pad and an individually packaged sheet for packaging the absorbent pad, wherein both widthwise side regions of the individually packaged sheet are folded inward in the width direction to cover the absorbent pad, folded in thirds, and both longitudinal sides of the absorbent pad and the individually packaged sheet are folded inward in the longitudinal direction, folded in thirds, and sealed with a tab tape; The absorbent pad has a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the top sheet and the back sheet, The absorbent body is an SAP sheet having a nonwoven fabric sheet and a superabsorbent polymer fixedly supported on the nonwoven fabric sheet, and does not contain fluff pulp; The individual packaging sheet includes a film, The compression recovery rate (RC) of the absorbent pad in a folded state in a KES compression test is 30% or more and 60% or less; The value (%) represented by the formula: (tensile modulus of elasticity of the individual wrapping sheet)÷(tensile modulus of elasticity of the tab tape)×100 is 5% or more and 50% or less. An individually packaged absorbent pad comprising:

2. The absorbent pad has a transfer sheet disposed between the top sheet and the absorbent body, The sum of the basis weight of the top sheet and the basis weight of the transfer sheet is 30 g / m ２ 70g / m or more ２ Is less than or equal to 2. The individually packaged absorbent pad according to claim 1.

3. The tensile modulus of the individual packaging sheet is 3 MPa or more and 7 MPa or less.

3. The individually packaged absorbent pad according to claim 1 or 2.

4. The tensile modulus of the tab tape is 15 MPa or more and 70 MPa or less.

3. The individually packaged absorbent pad according to claim 1 or 2.

5. The adhesive strength between the tab tape and the individual packaging sheet is 100 gf or more and 350 gf or less.

3. The individually packaged absorbent pad according to claim 1 or 2.

6. KES compression test: 50 gf / cm ２ The thickness of the absorbent pad under load is 1.5 mm or more and 3.5 mm or less.

3. The individually packaged absorbent pad according to claim 1 or 2.

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