Napkin set

Abstract

To provide an auxiliary napkin which is easily attached / detached to / from a sanitary napkin.SOLUTION: There is provided an auxiliary napkin (1) which is used by being attached to a skin side face of a sanitary napkin (2). A non-skin side face of the auxiliary napkin (1) is provided with an attachment part (31). A non-skin side face of the sanitary napkin (2) is provided with an adhesive part (41). An average value of the magnitude of the force that is applied when peeling the auxiliary napkin (1) from a second auxiliary napkin (1B) along the longitudinal direction after attaching the entire region of the attachment part (31) in the unused state to the skin side face of the second auxiliary napkin (1B) is smaller than an average value of the magnitude of the force that is applied when peeling the sanitary napkin (2) from the second sanitary napkin (1B) along the longitudinal direction after attaching the entire region in the width direction and the 50 mm region in the longitudinal direction of the adhesive part (41) in the unused state to the skin side face of the second auxiliary napkin (1B).SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to Napkin set .

Background Art

[0002] Conventionally, as a feminine hygiene product that absorbs body fluids, a sanitary napkin containing an absorber has been widely used. And, a method has been proposed to enhance the absorption performance of body fluids and the like and use the sanitary napkin efficiently by overlapping an auxiliary napkin on the skin side of the sanitary napkin. For example, Patent Document 1 discloses an absorbent article for attaching an auxiliary pad 2 that adheres to the labia majora to the body side (skin side) surface of a sanitary napkin 1 for attaching the auxiliary pad.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In recent years, when using such an auxiliary napkin, there has been an increasing desire to make the sanitary napkin last longer by replacing only the auxiliary napkin that has absorbed body fluids and reducing the replacement frequency of the sanitary napkin itself. At that time, it is desirable that the auxiliary napkin can be easily attached to and detached from the sanitary napkin. For example, when the wearer performs the replacement work of the auxiliary napkin in a narrow space such as a toilet cubicle, it is desirable that the auxiliary napkin can be attached to and detached from the sanitary napkin fixed to the underwear with only one hand.

[0005] However, while Patent Document 1 discloses that absorbent articles are equipped with guide elements to indicate the attachment position when attaching auxiliary pads (auxiliary napkins), it does not consider the convenience or ease of operation when removing the auxiliary napkin. In this case, it is difficult for the user to easily remove and replace only the auxiliary napkin from the sanitary napkin.

[0006] The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to provide an auxiliary sanitary napkin that is easy to attach to and detach from a sanitary napkin. [Means for solving the problem]

[0007] The main invention for achieving the above objective is: A napkin set comprising a sanitary napkin and an auxiliary napkin used by attaching it to the skin side of the sanitary napkin, The aforementioned supplemental napkin has an absorbent core and a liquid-impermeable back sheet positioned on the non-skin side of the absorbent core. The non-skin side of the back sheet is provided with an attachment portion for attaching the auxiliary napkin to the skin side of the sanitary napkin. The non-skin side of the aforementioned sanitary napkin is provided with an adhesive portion for securing the sanitary napkin to the user's underwear. The average value of the force applied when peeling the auxiliary napkin from the second auxiliary napkin along the longitudinal direction of the auxiliary napkin, after attaching the entire area of ​​the unused attachment portion to the skin side of the second auxiliary napkin having the same configuration as the auxiliary napkin, is: Of the unused adhesive portion, the entire area in the width direction and a 50 mm area in the longitudinal direction are attached to the skin-facing side of the second auxiliary napkin, and the force required to peel the sanitary napkin from the second auxiliary napkin along the longitudinal direction of the sanitary napkin is smaller than the average force required. The aforementioned back sheet is configured to prevent menstrual blood from moving from the skin side to the non-skin side. The aforementioned mounting portion is secured by hook and loop fasteners. It is composed of, In the width direction, a predetermined distance is provided between one end of the mounting portion and one end of the auxiliary napkin, and between the other end of the mounting portion and the other end of the auxiliary napkin. The aforementioned sanitary napkin has a pair of wing portions extending outwards in the width direction from the longitudinal central region of the napkin body, In the width direction, the length of the auxiliary napkin is greater than the length of the absorbent material provided in the sanitary napkin. This napkin set is characterized by the following features. Other features of the present invention will be made clearer by description in this specification and the accompanying drawings. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide an auxiliary sanitary napkin that is easy to attach to and detach from a sanitary napkin. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic plan view showing the auxiliary napkin 1 as seen from the skin-side and non-skin-side. [Figure 2] Figure 1 is a schematic cross-sectional view along line AA. [Figure 3] This is a schematic plan view showing the sanitary napkin 2 as seen from the skin-side and non-skin-side. [Figure 4] Figure 3 is a schematic cross-sectional view along line BB. [Figure 5] This is a schematic plan view showing the state in which a supplementary napkin 1 is attached to the skin side of a sanitary napkin 2. [Figure 6] Figures 6A and 6B are perspective views illustrating the attachment and detachment of the auxiliary sanitary napkin 1. [Figure 7] This diagram illustrates a method for evaluating the peel strength of the attachment portion 31 of the auxiliary napkin 1. [Figure 8] This table shows the data measured regarding the peel strength of the first auxiliary napkin 1A against the second auxiliary napkin 1B. [Figure 9] This figure illustrates a method for evaluating the peel strength of the adhesive portion 41 of the sanitary napkin 2 relative to the second auxiliary napkin 1B. [Figure 10]This is a table showing the measured data on the peel strength of the sanitary napkin 2 with respect to the second auxiliary napkin 1B. [Figure 11] This is a table showing the results of verifying the change in peel strength when the attachment part 31 of the auxiliary napkin 1 is repeatedly attached and detached. [Figure 12] This is a diagram explaining the method for evaluating the peel strength of the adhesive part 41 of the sanitary napkin 2. [Figure 13] This is a table showing the results of measuring the peel strength of the adhesive part 41 for multiple types of sanitary napkins 2.

Embodiments for Carrying Out the Invention

[0010] From the description in this specification and the attached drawings, at least the following matters become clear. An auxiliary napkin having a longitudinal direction and a width direction that intersect each other and being used by being attached to the skin side surface of a sanitary napkin. On the non-skin side surface of the auxiliary napkin, an attachment part for attaching the auxiliary napkin to the skin side surface of the sanitary napkin is provided. On the non-skin side surface of the sanitary napkin, an adhesive part for fixing the sanitary napkin to the user's underwear is provided. After attaching the entire area of the attachment part in the unused state to the skin side surface of the second auxiliary napkin having the same configuration as the auxiliary napkin, the average value of the force required to peel the auxiliary napkin from the second auxiliary napkin along the longitudinal direction is smaller than the average value of the force required to peel the sanitary napkin from the second auxiliary napkin along the longitudinal direction of the sanitary napkin after pasting the entire area in the width direction and a 50 mm area in the longitudinal direction of the unused adhesive part to the skin side surface of the second auxiliary napkin. An auxiliary napkin characterized by this.

[0011] According to such an auxiliary napkin, the attachment part of the auxiliary napkin can be easily peeled from the sanitary napkin along the longitudinal direction without peeling the adhesive part of the sanitary napkin from the user's underwear. Therefore, the attachment and detachment of the auxiliary napkin to and from the sanitary napkin can be easily performed.

[0012] In such an auxiliary napkin, it is desirable that the average magnitude of the force required when peeling the auxiliary napkin from the second auxiliary napkin along the width direction after attaching the entire area of ​​the unused attachment portion to the skin side of the second auxiliary napkin is smaller than the average magnitude of the force required when peeling the sanitary napkin from the second auxiliary napkin along the width direction after attaching the entire area in the width direction and 50 mm in the longitudinal direction of the unused adhesive portion to the skin side of the second auxiliary napkin.

[0013] With this type of auxiliary napkin, the attachment portion of the auxiliary napkin can be easily detached from the sanitary napkin along its width without having to peel the adhesive portion of the sanitary napkin from the user's underwear. Therefore, the auxiliary napkin can be easily attached to and detached from the sanitary napkin.

[0014] In such an auxiliary napkin, it is desirable that the length of the auxiliary napkin in the longitudinal direction is shorter than the length of the sanitary napkin in the longitudinal direction.

[0015] With this type of auxiliary napkin, even if leakage occurs outside the auxiliary napkin, it is absorbed by the absorbent material of the sanitary napkin, making it less likely to stain the wearer's underwear. In addition, precise positioning in the longitudinal direction is not required when attaching the auxiliary napkin, and when removing it, it is less likely that the auxiliary napkin, which has absorbed menstrual blood, will come into contact with the wearer's underwear. Therefore, attaching and removing the auxiliary napkin becomes easier.

[0016] In such an auxiliary napkin, the sanitary napkin has a first fold and a second fold, which serve as folds when packaging the sanitary napkin, provided at different positions in the longitudinal direction of the sanitary napkin, and it is desirable that the length of the auxiliary napkin in the longitudinal direction is longer than the distance between the first fold and the second fold in the longitudinal direction of the sanitary napkin.

[0017] With this type of auxiliary napkin, when placing the auxiliary napkin on the skin side of the sanitary napkin, the position of the auxiliary napkin can be adjusted based on folds F1 and F2. Therefore, the process of attaching the auxiliary napkin 1 becomes easier.

[0018] In such supplementary napkins, it is desirable that the color of the supplementary napkin is different from the color of the sanitary napkin.

[0019] With this type of auxiliary napkin, the outline of the auxiliary napkin becomes more visible even when it is placed on top of the sanitary napkin. Therefore, it becomes easier for the user to recognize whether the auxiliary napkin is properly attached to the sanitary napkin. In addition, it becomes easier to recognize where to grasp the auxiliary napkin when removing it.

[0020] In such auxiliary napkins, it is desirable that the color of the auxiliary napkin is a color that falls within the range of hue numbers 4 to 9 on the Ostwald color wheel.

[0021] With this type of supplemental napkin, the absorbent material is red in color, which has the effect of concealing absorbed menstrual blood. As a result, when changing used supplemental napkins, users can dispose of them without worrying about what others think, making it easier to change supplemental napkins without feeling self-conscious.

[0022] In such an auxiliary napkin, it is desirable that the attachment portion is detachably attached to the skin-facing side of the sanitary napkin.

[0023] With this type of auxiliary napkin, it is possible to repeatedly attach and detach the auxiliary napkin from the skin side of the sanitary napkin. Therefore, it is easier to change or adjust the position of the auxiliary napkin after it has been attached, making the process of attaching the auxiliary napkin much simpler.

[0024] In such auxiliary napkins, it is desirable that the attachment portion is made of hook-and-loop fasteners.

[0025] With this type of auxiliary napkin, even when the attachment part is engaged with the skin-side of the sanitary napkin and then peeled off, the engagement force of the attachment part does not easily decrease. Therefore, it becomes possible to repeatedly attach and detach the attachment part from the sanitary napkin, making the process of attaching the auxiliary napkin easier.

[0026] In such an auxiliary napkin, it is desirable that a predetermined gap is provided between one end of the attachment portion and the one end of the auxiliary napkin in the longitudinal direction.

[0027] With this type of auxiliary napkin, when removing it from the side of the sanitary napkin against the skin, the user can easily grasp the gap and pull the auxiliary napkin. This makes it easier to attach and detach the auxiliary napkin.

[0028] In such an auxiliary napkin, it is desirable that there is no gap between one end of the attachment portion and the one end of the auxiliary napkin in the longitudinal direction.

[0029] With this type of auxiliary napkin, the engagement force of the attachment part is greater, making it easier to securely fasten the auxiliary napkin to the skin side of the sanitary napkin. Therefore, even when the user walks or exercises while wearing the auxiliary napkin and sanitary napkin, the auxiliary napkin is less likely to shift position.

[0030] In such an auxiliary napkin, it is desirable that the attachment portion is not provided in the central part in the width direction.

[0031] With this type of auxiliary napkin, the rigidity in the central part in the width direction is lower than the rigidity in the sides. Therefore, when worn, the auxiliary napkin tends to bend and deform in the central part in the width direction, easily becoming a roughly mountain-shaped form with the central part in the width direction convex in the thickness direction. This makes the auxiliary napkin more likely to come into contact with the wearer's body, improving the fit and making it easier to absorb menstrual fluids and other excretions.

[0032] In such an auxiliary napkin, it is desirable that a folding guide line extending in the longitudinal direction is provided in the central part in the width direction.

[0033] With this type of auxiliary napkin, the folding guide lines create a crease in the napkin, making it more likely to deform into a convex shape when worn, and it can also be compactly packaged when folded in half widthwise.

[0034] Such an auxiliary sanitary napkin comprises a liquid-absorbing absorbent and a liquid-impermeable backsheet provided on the non-skin side of the absorbent, It is desirable that it has [this feature].

[0035] With this type of supplementary napkin, when used layered on the skin side of a sanitary napkin, the absorbent material of the supplementary napkin prevents menstrual blood absorbed by the supplementary napkin from transferring to the absorbent material of the sanitary napkin. Therefore, the absorbent material of the sanitary napkin is less likely to get soiled, and the sanitary napkin can be made to last longer.

[0036] It is desirable that such an auxiliary napkin be used by attaching the entire widthwise portion of the unused adhesive portion of the sanitary napkin and a 50 mm area in the longitudinal direction of the sanitary napkin to the cotton of a test cloth conforming to JIS L 0803, and then attaching it to the skin-side surface of the sanitary napkin, such that the average force required when peeling the sanitary napkin from the cotton of the test cloth along the longitudinal direction of the sanitary napkin is 2.87 N or more and 13.12 N or less.

[0037] Such supplementary napkins make it possible to create supplementary napkins that are easy to attach and detach from various types of commercially available sanitary napkins.

[0038] Furthermore, a napkin set comprising a sanitary napkin and an auxiliary napkin used by attaching it to the skin-facing side of the sanitary napkin, wherein the non-skin-facing side of the auxiliary napkin is provided with an attachment portion for attaching the auxiliary napkin to the skin-facing side of the sanitary napkin, and the non-skin-facing side of the sanitary napkin is provided with an adhesive portion for fixing the sanitary napkin to the user's underwear, and the entire area of ​​the unused attachment portion is the skin-facing side of a second auxiliary napkin having the same configuration as the auxiliary napkin. A napkin set is revealed in which the average magnitude of the force required when peeling the auxiliary napkin from the second auxiliary napkin along the longitudinal direction of the auxiliary napkin after it has been attached to the surface is smaller than the average magnitude of the force required when peeling the sanitary napkin from the second auxiliary napkin along the longitudinal direction of the sanitary napkin after the entire widthwise region and a 50 mm longitudinal region of the unused adhesive portion of the second auxiliary napkin have been attached to the skin-facing side of the second auxiliary napkin.

[0039] With this type of napkin set, the attachment portion of the auxiliary napkin can be easily detached from the sanitary napkin along its longitudinal direction without having to peel the adhesive portion of the sanitary napkin from the user's underwear. Therefore, the attachment and detachment of the auxiliary napkin to the sanitary napkin can be easily performed.

[0040] ===Implementation Method=== <Basic composition of supplemental sanitary napkin 1> This document describes a supplementary sanitary napkin 1, which is used in conjunction with a sanitary napkin as a feminine hygiene product. Figure 1 is a schematic plan view showing the supplementary sanitary napkin 1 from the skin-side and non-skin-side. Figure 2 is a schematic cross-sectional view along line AA shown in Figure 1.

[0041] The auxiliary napkin 1 is a so-called flat-type napkin, with a roughly oval shape in plan view, and has a longitudinal direction, a width direction, and a thickness direction that are perpendicular to each other. The longitudinal direction is along the longitudinal direction of the auxiliary napkin 1 product, and the width direction is along the short direction of the auxiliary napkin 1 product. In the thickness direction, the side that comes into contact with the wearer's body is called the skin side, and the opposite side is called the non-skin side.

[0042] As shown in Figure 2, the auxiliary napkin 1 comprises an absorbent core 10, a top sheet 11 positioned on the skin side of the absorbent core 10, an intermediate sheet 12 positioned between the absorbent core 10 and the top sheet 11, side sheets 13 positioned on the non-skin side of the absorbent core 10 so as to extend outward on both sides in the width direction, and a back sheet 14 positioned on the non-skin side of the absorbent core 10 and the side sheets 13. Each material adjacent to the other in the thickness direction is joined to each other by an adhesive, such as a hot melt adhesive.

[0043] The absorbent body 10 comprises a super absorbent polymer (also called "SAP") and liquid absorbent fibers such as pulp fibers. In this embodiment, it is formed in a roughly oval shape that is elongated in the longitudinal direction, as shown by the dashed line in Figure 1. The liquid absorbent fibers containing SAP (absorbent core) may be covered with a liquid-permeable core wrap sheet (not shown). Furthermore, the composition of the absorbent body 10 is not limited to the above, and examples include an SAP sheet in which an SAP layer is attached to a hydrophilic sheet, and an airlaid sheet in which liquid absorbent fibers are formed into a sheet by the airlaid method.

[0044] The top sheet 11 is a liquid-permeable sheet member positioned closest to the skin in the thickness direction of the auxiliary napkin 1, and is the member that comes into direct contact with the wearer's skin when the auxiliary napkin 1 is in use. Therefore, it is desirable that the top sheet 11 be as flexible and soft to the skin as possible. Examples of sheet members that make up the top sheet 11 in this embodiment include, for example, air-through nonwoven fabric. Also, as shown in Figure 2, the top sheet 11 in this embodiment is positioned to cover the absorbent body 10 from the skin side, and both ends in the width direction are folded into the non-skin side of the absorbent body 10.

[0045] The intermediate sheet 12 is a liquid-permeable sheet member positioned between the absorbent material 10 and the top sheet 11 in the thickness direction of the auxiliary napkin 1. Examples of sheet members that make up the intermediate sheet 12 include spunbond nonwoven fabric, airlaid nonwoven fabric, tissue, and air-through nonwoven fabric. Note that the intermediate sheet 12 is not necessarily required.

[0046] The side sheets 13 are components that make up both ends in the width direction on the skin-facing side of the auxiliary napkin 1. When the auxiliary napkin 1 is attached, the side sheets 13 are also likely to come into direct contact with the wearer's skin, so it is desirable that they be as flexible as possible, similar to the top sheet 11. Examples of sheet materials that make up the side sheets 13 in this embodiment include air-through nonwoven fabric.

[0047] The backsheet 14 is a liquid-impermeable and breathable sheet material positioned on the non-skin side of the absorbent core 10 in the thickness direction of the auxiliary napkin 1. The presence of this backsheet 14 prevents liquids such as menstrual blood absorbed by the absorbent core 10 from penetrating from the skin side to the non-skin side. Therefore, when using the auxiliary napkin 1 layered on the skin side of a sanitary napkin, it prevents menstrual blood absorbed by the auxiliary napkin 1 from penetrating the sanitary napkin on the non-skin side. Examples of sheet materials constituting the backsheet 14 in this embodiment include polyethylene and polypropylene resin films.

[0048] Furthermore, the non-skin side of the backsheet 14 is provided with an attachment portion 31 for attaching the auxiliary napkin 1 to the skin side of the sanitary napkin. In this embodiment, as shown in Figure 1, the attachment portion 31 consists of a pair of band-shaped regions arranged side by side on the left and right sides along the longitudinal direction, with the central position CI in the width direction in between. The non-skin side of the auxiliary napkin 1 is detachably fixed to the skin side of the sanitary napkin via this attachment portion 31. Details of the configuration and function of the attachment portion 31 will be described later.

[0049] <Basic composition of sanitary napkin 2> Next, we will describe a sanitary napkin 2 as an example of a sanitary napkin to which the auxiliary napkin 1 is attached. The auxiliary napkin 1 of this embodiment can be used by attaching it to a commercially available sanitary napkin (including sanitary napkin 2) that meets the predetermined conditions described herein.

[0050] Figure 3 is a schematic plan view showing the sanitary napkin 2 as seen from the skin-side and non-skin-side. Figure 4 is a schematic cross-sectional view along line BB shown in Figure 3. In Figure 3, the sanitary napkin 2 has a longitudinal direction, a width direction, and a thickness direction that are perpendicular to each other. The longitudinal direction is along the product's longitudinal direction, and the width direction is along the product's short direction. In this embodiment, the longitudinal direction of the sanitary napkin 2 (see Figure 3) and the longitudinal direction of the auxiliary napkin 1 (see Figure 1) are corresponding directions. Therefore, below, both will simply be referred to as the "longitudinal direction," and when necessary, distinguished as "the longitudinal direction of the sanitary napkin 2." The same applies to the "thickness direction" and the "width direction."

[0051] The sanitary napkin 2 comprises an absorbent core 20, a top sheet 21, a top sheet 21 positioned on the skin side of the absorbent core 20, a second sheet 22 positioned between the absorbent core 20 and the top sheet 21, a side flap 23 positioned on the skin side of the absorbent core 20 so as to extend outward in the width direction, and a back sheet 24 positioned on the non-skin side of the absorbent core 20 and the side flap 23. Each adjacent material in the thickness direction is joined to each other with an adhesive such as a hot melt adhesive. The sanitary napkin 2 also comprises a napkin body portion 2C on which the absorbent core 20 is provided, and a pair of wing portions 2W extending outward on both sides in the width direction from the longitudinal central region of the napkin body portion 2C (see Figure 3). However, the sanitary napkin 2 does not necessarily have to have wing portions 2W.

[0052] The absorbent core 20, top sheet 21, second sheet 22, side flaps 23, and back sheet 24 of sanitary napkin 2 have substantially the same functions and configuration as the absorbent core 10, top sheet 11, middle sheet 12, side sheets 13, and back sheet 14 of auxiliary napkin 1, respectively, so a detailed explanation is omitted here.

[0053] The non-skin side of the napkin body 2C in the thickness direction (the non-skin side of the back sheet 24) is provided with adhesive portions 41 formed by applying an appropriate adhesive, such as a hot-melt adhesive, to multiple strip-shaped areas along the longitudinal direction. When the sanitary napkin 2 is used, the adhesive portions 41 are attached to the wearer's underwear, thereby fixing the sanitary napkin 2 to the underwear.

[0054] Similarly, a wing adhesive portion 42 is provided on the non-skin side of the wing portion 2W in the thickness direction (the non-skin side of the back sheet 24). When the sanitary napkin 2 is attached, the wing portion 2W is folded towards the non-skin side, and the wing adhesive portion 42 is attached to the non-skin side in the crotch area of ​​underwear, thereby preventing the sanitary napkin 2 from shifting position. Note that the shape, number, size, etc. of the adhesive portion 41 and the wing adhesive portion 42 are not limited to those shown in Figure 3.

[0055] Furthermore, when the sanitary napkin 2 is individually packaged for distribution to the market as a product, it is folded in thirds along the longitudinal direction at a first fold F1 and a second fold F2 set at predetermined positions along the longitudinal direction. The first fold F1 is formed along the width direction on the front side in the longitudinal direction (in front of the wing portion 2W), as shown in Figure 3. Similarly, the second fold F2 is formed along the width direction on the rear side in the longitudinal direction (rear of the wing portion 2W). Note that the sanitary napkin 2 may have other folds (for example, a third fold) besides the first fold F1 and the second fold F2.

[0056] <How to use supplemental sanitary napkin 1> This section describes the specific usage of the auxiliary napkin 1 when attached to a sanitary napkin 2. Figure 5 is a schematic plan view showing the auxiliary napkin 1 attached to the skin side of the sanitary napkin 2. Figures 6A and 6B are perspective views illustrating the attachment and detachment of the auxiliary napkin 1. In practice, the auxiliary napkin 1 is often attached to and detached from the sanitary napkin 2, which is already fixed to the wearer's underwear. That is, the auxiliary napkin 1 is attached to and detached from the sanitary napkin 2, which has been deformed into a curved shape to conform to the wearer's body shape. However, for the sake of explanation, Figures 5 and 6 show the auxiliary napkin 1 being attached to and detached from the sanitary napkin 2 in a flat state.

[0057] When using the auxiliary napkin 1, first, position the auxiliary napkin 1 so that its longitudinal direction aligns with the longitudinal direction of the sanitary napkin 2, overlapping the non-skin side of the auxiliary napkin 1 with the skin side of the sanitary napkin 2. Then, press the attachment portion 31 provided on the non-skin side of the auxiliary napkin 1 against the top sheet 21 of the sanitary napkin 2, applying pressure from the skin side to the non-skin side to secure them together. At this time, it is preferable to adjust the position of the auxiliary napkin 1 so that its longitudinal center position CL is approximately the center of the longitudinal wing portion 2W of the sanitary napkin 2. Since the wing portion 2W of the sanitary napkin 2 is located in the crotch area of ​​the wearer in the longitudinal direction, positioning the auxiliary napkin 1 based on the position of the wing portion 2W makes it easier for the auxiliary napkin 1 to come into contact with the wearer's ostomy opening when worn, and to absorb menstrual blood, etc.

[0058] In this embodiment, the attachment portion 31 is made of a hook-and-loop fastener with multiple locking protrusions (hooks) on the non-skin side. The locking protrusions on the non-skin side of the attachment portion 31 are hooked onto the nonwoven fabric fibers of the top sheet 21 provided on the skin side of the sanitary napkin 2, thereby fixing the non-skin side of the auxiliary napkin 1 to the skin side of the sanitary napkin 2. In this way, the auxiliary napkin 1 can be easily attached to and detached from the sanitary napkin 2. Furthermore, since the binding force of the hook-and-loop fastener does not easily decrease even after repeated attachment and detachment, the position of the auxiliary napkin 1 during attachment can be easily adjusted. However, the elements constituting the attachment portion 31 are not limited to hook-and-loop fasteners. For example, the attachment portion 31 may be made of an adhesive surface using an adhesive.

[0059] As shown in Figure 6A, with the auxiliary napkin 1 attached, the sanitary napkin 2 is less likely to get soiled because the auxiliary napkin 1 primarily absorbs the menstrual blood and other fluids excreted from the wearer's body. After the auxiliary napkin 1 has absorbed a predetermined amount of menstrual blood, it is removed from the sanitary napkin 2 and replaced with a new auxiliary napkin 1.

[0060] When removing the auxiliary napkin 1 from the sanitary napkin 2, for example, hold the front edge of the sanitary napkin 2 in the longitudinal direction with one hand, grasp the front edge of the auxiliary napkin 1 in the longitudinal direction with the other hand, and pull it toward the rear as shown in Figure 6B to detach the attachment part 31 from the top sheet 21 of the sanitary napkin 2. Alternatively, the auxiliary napkin 1 can be removed by pulling it from one side in the width direction to the other. After removing the used auxiliary napkin 1, prepare a new auxiliary napkin 1 and attach it to the skin side of the sanitary napkin 2 again as shown in Figure 6A. In this way, by changing only the auxiliary napkin 1 multiple times, the frequency of changing the sanitary napkin 2 itself is reduced, and the sanitary napkin 2 can be made to last longer.

[0061] In this embodiment, the removal of the auxiliary napkin 1, as explained in Figure 6B, can be performed with only one hand. For example, even without grasping and supporting the sanitary napkin 2 with one hand, it is possible to peel the attachment portion 31 of the auxiliary napkin 1 from the skin side of the sanitary napkin 2. In other words, when removing the auxiliary napkin 1 attached to the skin side of the sanitary napkin 2, the attachment portion 31 of the auxiliary napkin 1 can be peeled off the sanitary napkin 2 without peeling the adhesive portion 41 of the sanitary napkin 2 from the wearer's underwear. The features of the attachment portion 31 of the auxiliary napkin 1 that enable this operation will be described below.

[0062] <Regarding the peel strength of the mounting portion 31> In this embodiment, the peel strength of the attachment portion 31 of the auxiliary napkin 1 is adjusted so that the force required to attach and then detach the attachment portion 31 of the auxiliary napkin 1 from a predetermined cloth is less than the force required to attach and then detach the adhesive portion 41 of the sanitary napkin 2 from a predetermined cloth. In other words, by making the peel strength of the attachment portion 31 of the auxiliary napkin 1 weaker than the peel strength of the adhesive portion 41 of the sanitary napkin 2, it is possible to easily remove the auxiliary napkin 1 from the sanitary napkin 2.

[0063] Figure 7 illustrates the method for evaluating the peel strength of the attachment portion 31 of the auxiliary napkin 1. The peel strength is evaluated using an airbag-type pressurizer 70 and a tensile testing machine (not shown).

[0064] The evaluation procedure begins by preparing a common attachment member S to compare the peel strength of the attachment portion 31 of the auxiliary napkin 1 and the adhesive portion 41 of the sanitary napkin 2. Next, the force required when attaching and then removing the attachment portion 31 of the auxiliary napkin 1 from this attachment member S is measured and determined as the peel strength of the attachment portion 31. Similarly, the force required when attaching and then removing the adhesive portion 41 of the sanitary napkin 2 from the attachment member S is measured and determined as the peel strength of the adhesive portion 41. Finally, the relationship between the peel strength of the attachment portion 31 and the peel strength of the adhesive portion 41 is compared.

[0065] As the member to be attached S, a napkin (auxiliary napkin 1) having the same configuration as auxiliary napkin 1 is used. In the following description, the auxiliary napkin 1 that serves as the sample for measuring the peel strength of the attachment part 31 is referred to as the first auxiliary napkin 1A. The auxiliary napkin 1 used as the member to be attached S is referred to as the second auxiliary napkin 1B.

[0066] When measuring the peel strength of the attachment portion 31 of the auxiliary napkin 1, as shown in Figure 7, the first auxiliary napkin 1A is placed on a horizontal surface with the side on which the attachment portion 31 is located (the non-skin side in Figure 2) facing upwards, ensuring that no wrinkles are created on the surface. The attachment portion 31 of the first auxiliary napkin 1A is kept unused, and the attachment portion 31 is not touched during the measurement. Next, the second auxiliary napkin 1B is placed on top of the first auxiliary napkin 1A in the thickness direction, with the side on which the attachment portion 31 is located (the non-skin side) facing upwards. When stacking the two, the longitudinal direction of the first auxiliary napkin 1A and the longitudinal direction of the second auxiliary napkin 1B are aligned. That is, the entire non-skin side of the first auxiliary napkin 1A is positioned to overlap the entire skin side of the second auxiliary napkin 1B. As a result, the entire area of ​​the attachment portion 31 of the first auxiliary napkin 1A comes into contact with the top sheet 11 of the second auxiliary napkin 1B, and the two are lightly engaged (attached) together.

[0067] Next, the airbag 72 is placed on the upper side of the second auxiliary napkin 1B in the thickness direction. At this time, it is preferable to place a spacer sheet P, such as release paper, between the attachment portion 31 of the second auxiliary napkin 1B and the airbag 72. The spacer sheet P prevents the attachment portion 31 of the second auxiliary napkin 1B and the airbag 72 from engaging (sticking together). The airbag 72 is a rubber bag-shaped member with dimensions of 120 mm x 230 mm, and by supplying compressed air inside, it is possible to apply pressure of 20 mm to 300 mm Hg to the sample.

[0068] Next, the fixing plate 71 is placed on top of the airbag 72 and fixed in place. Compressed air is supplied to the airbag 72 in this state and pressurized at a pressure of 300 mmHg for 1 minute. As a result, a uniform compressive force is applied in the thickness direction to the first auxiliary napkin 1A and the second auxiliary napkin 1B between the fixing plate 71 (and airbag 72) and the base, and the entire area of ​​the attachment portion 31 of the first auxiliary napkin 1A (sample) is firmly attached to the top sheet 11 of the second auxiliary napkin 1B (attached member S).

[0069] After the mounting portion 31 is attached to the member to be mounted S, the fixing plate 71 and the airbag 72 are removed. Then, cloth tape is attached to the predetermined positions of the first auxiliary napkin 1A and the second auxiliary napkin 1B to form gripping portions for when the tensile testing machine is used to pull them. After the gripping portions are formed, the gripping portion of the second auxiliary napkin 1B (member to be mounted S) is grasped by one grip (not shown) of the tensile testing machine, and the gripping portion of the first auxiliary napkin 1A (sample) is grasped by the other grip (not shown) of the tensile testing machine. At this time, the distance between the grips of the tensile testing machine (distance between one side and the other side) is 20 mm.

[0070] Then, the first auxiliary napkin 1A and the second auxiliary napkin 1B are pulled along the longitudinal direction of the first auxiliary napkin 1A at a speed of 300 m / min, and the average load (N) applied until the entire area of ​​the attachment portion 31 of the first auxiliary napkin 1A peels off from the second auxiliary napkin 1B is measured. This measurement is performed for multiple different first auxiliary napkins 1A (for example, 5), and the average value is calculated to be the peel strength in the longitudinal direction of the attachment portion 31.

[0071] In this embodiment, the auxiliary napkin 1 is expected to be distributed to the market in a package containing multiple napkins. Therefore, it is preferable to select a predetermined number (e.g., 5 napkins) of auxiliary napkins 1 from among the multiple auxiliary napkins 1,1... packaged in the same package as the sample to be evaluated, and perform the above measurements on each sample. However, it is not necessary to select samples from within the same package; for example, a predetermined number (e.g., 5 napkins) of auxiliary napkins 1 can be randomly selected from among those contained in the cardboard box containing multiple packages and used as a sample.

[0072] Similarly, the average load (N) is measured when the first auxiliary napkin 1A and the second auxiliary napkin 1B are pulled along the width direction of the first auxiliary napkin 1A at a speed of 300 m / min, and the peel strength in the width direction of the attachment portion 31 is measured. Such measurements are performed for multiple different first auxiliary napkins 1A (for example, 5 napkins), and the average value is calculated to determine the peel strength in the width direction of the attachment portion 31.

[0073] Figure 8 is a table showing the data measured regarding the peel strength of the first auxiliary napkin 1A against the second auxiliary napkin 1B. For the first auxiliary napkin 1A, ten different samples S1 to S10, each with a different attachment part 31 structure, were used to measure the peel strength.

[0074] Samples S1 and S2 use commercially available hook-and-loop fasteners (hook tape 1) as the attachment part 31. Hook tape 1 has multiple hooks consisting of a column part and a bulk part, provided on a base film. The length of the umbrella part in the longitudinal direction (MD cap diameter) is 240 μm, the length of the umbrella part in the width direction (CD cap diameter) is 300 μm, the height of the column part (pin height) is 100 μm, the base film thickness is 55 μm, the CD hook diameter is 150 μm, the hook basis weight is 60 g / m2, and the number of hook pins is 3500 / 25.4 mm square. In samples S1 and S2, the hook tape 1 was arranged over a length of 100 mm with widths of 5 mm and 11 mm on each side and a spacing of 30 mm to form the attachment part 31 (see Figure 8 for details of the conditions).

[0075] Samples S3 to S5 use a different hook tape 2 (hook fastener) as the attachment part 31, compared to the hook tape 1 described above. Hook tape 2 has multiple hooks consisting of a column part and a bulk part, provided on a base film. The length in the longitudinal direction of the umbrella part (MD cap diameter) is 300 μm, the length in the width direction of the umbrella part (CD cap diameter) is 410 μm, the height of the column part (pin height) is 290 μm, the base film thickness is 90 μm, the CD hook diameter is 200 μm, the hook basis weight is 100 g / m2, and the number of hook pins is 1600 / 25.4 mm square. In samples S3 to S5, the hook tape 2 was arranged in a 100 mm length range with a width of 15 to 22 mm on one side and a spacing of 25 mm, to form the attachment part 31 (see Figure 8 for details of the conditions).

[0076] Samples S6 to S10 have adhesive surfaces formed as mounting sections 31 by applying an adhesive such as hot melt adhesive (HMA) in different amounts to different regions. The adhesive used to form the mounting sections 31 has a block copolymer of SBS (styrene-butadiene-styrene copolymer), a viscosity of 6000 MPa·s at 140°C, 2800 MPa·s at 160°C, 1450 MPa·s at 180°C, and a softening point of 85°C. In samples S6 to S10, this adhesive was applied to regions of different lengths and widths while changing the amount of adhesive used to form the mounting sections 31 (see Figure 8 for details of the conditions).

[0077] Furthermore, all structures other than the attachment portion 31 are common to samples S1 to S10. Therefore, the configuration of the skin-facing side (top sheet 11) of the second auxiliary napkin 1B to which the attachment portion 31 of the first auxiliary napkin 1A is attached is also common.

[0078] Furthermore, the top sheet 11 of the second auxiliary napkin 1B is an air-permeable nonwoven fabric with a thickness of 0.4 mm. Tensile tests were conducted, and the tensile strength when stretched by 5% in the longitudinal direction (MD direction) was 4.0 N / mm², with a maximum tensile strength of 17.2 N / mm². When stretched by 5% in the width direction (CD direction), the tensile strength was 0.3 N / mm², with a maximum tensile strength of 4.1 N / mm². Tear tests were conducted, and the maximum tear strength in the longitudinal direction (MD direction) was 3.3 N / mm², and the maximum tear strength in the width direction (CD direction) was 2.7 N / mm². The absorbent material used is made of softwood pulp, crushed and laminated with a basis weight of 200 g / m² and a thickness of 3 mm. A non-permeable film with a basis weight of 25 g / m² was used as the back film.

[0079] The measurement results showed that the peel strength in the longitudinal direction of the first auxiliary napkin 1A (samples S1 to S10) was 0.61 N (sample S1) to 2.20 N (sample S8), and the peel strength in the width direction was 1.33 N (sample S2) to 7.71 N (sample S6).

[0080] Figure 9 illustrates a method for evaluating the peel strength of the adhesive portion 41 of the sanitary napkin 2 relative to the second auxiliary napkin 1B. The peel strength of the adhesive portion 41 of the sanitary napkin 2 can be measured in substantially the same manner as the peel strength of the attachment portion 31 of the first auxiliary napkin 1A. When measuring the peel strength of the adhesive portion 41 of the sanitary napkin 2, first, a sample is prepared by cutting the sanitary napkin 2 to a predetermined length in the longitudinal direction. As shown in Figure 5, the length of the sanitary napkin 2 in the longitudinal direction is longer than the length of the second auxiliary napkin 1B (auxiliary napkin 1) in the longitudinal direction, so the peel strength is measured by treating both as having equivalent lengths. In this embodiment, the sanitary napkin 2 is cut at a position 90 mm from one end in the longitudinal direction. The wing portion 2W is also cut. Furthermore, if the sanitary napkin 2 being evaluated has so-called three-dimensional gathers or equivalent parts, the measurement will be performed after eliminating stress by cutting the elastic material of the three-dimensional gathers or by other means.

[0081] Next, the sanitary napkin 2 (sample), cut to a predetermined length, is placed on a horizontal surface with the side containing the adhesive portion 41 (the non-skin side in Figure 4) facing upwards, as shown in Figure 9, ensuring that no wrinkles are created on the surface. The adhesive portion 41 of the sanitary napkin 2 is left unused, and care is taken not to touch the adhesive portion 41 during the measurement. Then, the second auxiliary napkin 1B is placed on top of the sanitary napkin 2 in the thickness direction, with the side containing the attachment portion 31 (the non-skin side) facing upwards. When stacking the two, the longitudinal direction of the sanitary napkin 2 and the longitudinal direction of the second auxiliary napkin 1B are aligned. As a result, the entire widthwise and predetermined longitudinal areas of the adhesive portion 41 of the sanitary napkin 2 come into contact with the top sheet 11 of the second auxiliary napkin 1B, and the two are lightly engaged (attached).

[0082] Next, the airbag 72 is placed on the upper side of the second auxiliary napkin 1B in the thickness direction, and the fixing plate 71 is placed on top of the airbag 72 to secure it. In this state, compressed air is supplied to the airbag 72 and pressurized at a pressure of 300 mmHg for 1 minute. As a result, a uniform compressive force is applied in the thickness direction to the sanitary napkin 2 and the second auxiliary napkin 1B between the fixing plate 71 (and airbag 72) and the base, and the adhesive part 41 of the sanitary napkin 2 (sample) is firmly attached to the top sheet 11 of the second auxiliary napkin 1B (attached member S).

[0083] After the adhesive part 41 is attached to the member to be attached S, the fixing plate 71 and airbag 72 are removed, and cloth tape is attached to the predetermined positions of the sanitary napkin 2 and the second auxiliary napkin 1B to form gripping parts for when the tensile testing machine is used to pull them. Then, the gripping part of the second auxiliary napkin 1B (member to be attached S) is grasped with one gripping part (not shown) of the tensile testing machine, and the gripping part of the sanitary napkin 2 (sample) is grasped with the other gripping part (not shown) of the tensile testing machine. At this time, the distance between the gripping parts of the tension testing machine (distance between one side and the other side) is 20 mm.

[0084] Then, the sanitary napkin 2 and the second auxiliary napkin 1B are pulled along the longitudinal direction of the sanitary napkin 2 at a speed of 300 m / min, and the average load (N) applied until a 50 mm long area of ​​the adhesive portion 41 of the sanitary napkin 2 peels off from the second auxiliary napkin 1B is measured. This measurement is performed for multiple different sanitary napkins 2 (for example, 5), and the average load is calculated to determine the peel strength of the adhesive portion 41 in the longitudinal direction.

[0085] Similarly, the average load (N) is measured when the sanitary napkin 2 and the second auxiliary napkin 1B are pulled along the width direction of the sanitary napkin 2 at a speed of 300 m / min. Such measurements are performed for multiple different sanitary napkins 2 (e.g., 5 napkins), and the average load is calculated to be used as the peel strength in the width direction of the adhesive portion 41.

[0086] Figure 10 is a table showing the data measured regarding the peel strength of sanitary napkin 2 against the second auxiliary napkin 1B. Ten types of commercially available sanitary napkins, X1 to X10 described later, were used as samples for measurement as sanitary napkin 2. As a result, the peel strength in the longitudinal direction of sanitary napkin 2 (samples X1 to X10) was 3.11N (sample X2) to 4.31N (sample X6), and the peel strength in the width direction was 8.84N (sample X6) to 19.39N (sample X5).

[0087] From the results in Figures 8 and 10, it was confirmed that the longitudinal peel strength of the attachment portion 31 of the first auxiliary napkin 1A (0.61N to 2.20N) was smaller than the longitudinal peel strength of the adhesive portion 41 of the sanitary napkin 2 (3.11N to 4.31N). Thus, in the auxiliary napkin 1 of this embodiment, the peel strength of the attachment portion 31 is adjusted so that the longitudinal peel strength of the attachment portion 31 is smaller than the longitudinal peel strength of the adhesive portion 41. In other words, the average force required when peeling the first auxiliary napkin 1A from the second auxiliary napkin 1B along its longitudinal direction after attaching the entire area of ​​the attachment portion 31 of the unused first auxiliary napkin 1A to the skin-facing side of the second auxiliary napkin 1B is smaller than the average force required when peeling the sanitary napkin 2 from the second auxiliary napkin 1B along its longitudinal direction after attaching the entire area of ​​the adhesive portion 41 of the unused sanitary napkin 2 in the width direction and a 50 mm area in the longitudinal direction to the skin-facing side of the second auxiliary napkin 1B.

[0088] Therefore, after attaching the auxiliary napkin 1 to the skin side of the sanitary napkin 2, it becomes possible to easily peel off only the auxiliary napkin 1 along its length. In other words, the attachment portion 31 of the auxiliary napkin 1 can be peeled off from the sanitary napkin 2 without peeling the adhesive portion 41 of the sanitary napkin 2 from the user's (wearer's) underwear. This makes it easier to attach and detach the auxiliary napkin 1 from the sanitary napkin 2.

[0089] Similarly, the results in Figures 8 and 10 confirm that the peel strength in the width direction of the attachment portion 31 of the first auxiliary napkin 1A (1.33N to 7.71N) is smaller than the peel strength in the width direction of the adhesive portion 41 of the sanitary napkin 2 (8.84N to 19.39N). Thus, in the auxiliary napkin 1 of this embodiment, the peel strength of the attachment portion 31 is adjusted so that the peel strength in the width direction of the attachment portion 31 is smaller than the peel strength in the width direction of the adhesive portion 41. In other words, the average force required when peeling the first auxiliary napkin 1A from the second auxiliary napkin 1B along its width direction after attaching the entire area of ​​the attachment portion 31 of the unused first auxiliary napkin 1A to the skin-facing side of the second auxiliary napkin 1B is smaller than the average force required when peeling the sanitary napkin 2 from the second auxiliary napkin 1B along its width direction after attaching the entire area of ​​the adhesive portion 41 of the unused sanitary napkin 2 in the width direction and a 50 mm area in the longitudinal direction to the skin-facing side of the second auxiliary napkin 1B. Therefore, attaching and detaching the auxiliary napkin 1 from the sanitary napkin 2 becomes easier.

[0090] Furthermore, in this embodiment, the length of the auxiliary napkin 1 in the longitudinal direction is shorter than the length of the sanitary napkin 2 in the longitudinal direction. Therefore, when the auxiliary napkin 1 is attached to the sanitary napkin 2 as shown in Figure 5, the absorbent material 20 of the sanitary napkin 2 is positioned outside the auxiliary napkin 1 in the longitudinal direction. Consequently, even if leakage occurs outside the auxiliary napkin 1 due to reasons such as the auxiliary napkin 1 not being able to absorb all of the menstrual blood, the leaked liquid will be absorbed by the absorbent material 20 of the sanitary napkin 2, making it less likely to stain the wearer's underwear. In addition, because the sanitary napkin 2 to which the auxiliary napkin 1 is attached is larger (longer in the longitudinal direction), it becomes easier to attach and detach the auxiliary napkin 1 as explained in Figure 6. For example, when attaching the auxiliary napkin 1, it is possible to prevent the auxiliary napkin 1 from protruding from the sanitary napkin 2 without having to precisely adjust its position in the longitudinal direction. Furthermore, when removing the auxiliary napkin 1, it is less likely that the auxiliary napkin 1, which has absorbed menstrual blood, will come into contact with the wearer's underwear, allowing the user to remove it easily without excessive caution. In this way, the process of changing the auxiliary napkin 1 can be made easier.

[0091] Furthermore, the length of the auxiliary napkin 1 in the longitudinal direction is longer than the distance in the longitudinal direction between the first fold F1 and the second fold F2, which form the fold when packaging the sanitary napkin 2 (see Figure 5). With this configuration, when attaching the auxiliary napkin 1 to the sanitary napkin 2, the user can adjust the position of the auxiliary napkin 1 based on the folds F1 and F2. Specifically, the front edge of the auxiliary napkin 1 in the longitudinal direction should be in front of the first fold F1, and the rear edge of the auxiliary napkin 1 in the longitudinal direction should be behind the second fold F2. In other words, the auxiliary napkin 1 is positioned so as to straddle the first fold F1 and the second fold F2 in the longitudinal direction. This makes it possible to position the auxiliary napkin 1 in an appropriate position on the skin side of the sanitary napkin 2. Therefore, the attachment of the auxiliary napkin 1 becomes easier.

[0092] Furthermore, it is desirable that the color of the auxiliary napkin 1 and the color of the sanitary napkin 2 be different. At a minimum, it is desirable that the color of the outer edge of the auxiliary napkin 1 (i.e., the outline of the auxiliary napkin 1) and the color of the skin-facing side of the sanitary napkin 2 be different. As shown in Figure 5, when the auxiliary napkin 1 is attached to the sanitary napkin 2, if the color of the outer edge of the auxiliary napkin 1 and the color of the skin-facing side of the sanitary napkin 2 are different, the outline of the auxiliary napkin 1 becomes easier to see. Therefore, the user can more easily recognize whether the attachment position of the auxiliary napkin 1 is appropriate for the sanitary napkin 2. Also, when removing the auxiliary napkin 1, it becomes easier to recognize where to grasp the auxiliary napkin 1. This makes the process of attaching the auxiliary napkin 1 easier. Note that "different" colors refer to a state where the colors are shifted by three or more hues on the Ostwald color system's color wheel.

[0093] Furthermore, it is desirable that the absorbent material 10 of the auxiliary napkin 1 be a reddish color. Specifically, it is desirable that the color be within the range of hue numbers 4 to 9 on the Ostwald color wheel (the range of "orange" or "red"). Since the absorbent material 10 of the auxiliary napkin 1 is primarily intended to absorb menstrual blood, making the absorbent material 10 reddish in color provides the effect of concealing the absorbed menstrual blood. This allows the user to dispose of the used auxiliary napkin 1 without worrying about what others might think when changing it.

[0094] Furthermore, it is desirable that the attachment portion 31 of the auxiliary napkin 1 be detachable from the sanitary napkin 2. In other words, it is desirable that the attachment portion 31 maintains sufficient adhesion even when the auxiliary napkin 1 is repeatedly attached to and removed from the skin side of the sanitary napkin 2. With such a configuration, the position of the auxiliary napkin 1 relative to the sanitary napkin 2 can be easily adjusted. For example, if the attachment position of the auxiliary napkin 1 is to be changed after it has been attached to the skin side of the sanitary napkin 2, the auxiliary napkin 1 can be removed from the sanitary napkin 2, its position changed, and then reattached, while still being securely fixed. This makes the attachment process of the auxiliary napkin 1 much easier.

[0095] In this embodiment, the attachment portion 31 of the auxiliary napkin 1 is made of hook-and-loop fastener, making it easier to attach and detach from the sanitary napkin 2. If the attachment portion 31 were made of an adhesive surface using an adhesive, when the attachment portion 31 is attached to and then removed from the sanitary napkin 2, fibers from the nonwoven fabric will adhere to the attachment portion 31 (adhesive surface), reducing the bonding strength. In this case, it would be difficult to reattach the attachment portion 31 to the sanitary napkin 2. In contrast, if the attachment portion 31 is a hook-and-loop fastener, the engagement force (bonding strength) of the attachment portion 31 does not easily decrease even after the attachment portion 31 has been engaged with the skin-side surface of the sanitary napkin 2 and then removed. Therefore, it is possible to repeatedly attach and detach the attachment portion 31 from the sanitary napkin 2. This makes it easy to adjust the attachment position of the auxiliary napkin 1 to the sanitary napkin 2.

[0096] Figure 11 is a table showing the results of a verification of the change in peel strength when the attachment part 31 of the auxiliary napkin 1 is repeatedly attached and detached. The verification of repeated peel strength was carried out as follows. First, sample S2 (hook tape 1) and sample S6 (adhesive surface), as described in Figure 8, were prepared as the auxiliary napkin 1 to be measured for repeated peel strength. Then, the peel strength was measured for each of samples S2 and S6 for the first time using the method described in Figure 7. Next, the peel strength was measured again using the same samples S2 and S6 that were used for the first measurement, using the method described in Figure 7 (second measurement). This operation was performed multiple times (three times in this embodiment) to verify how the peel strength changes when the attachment part 31 is repeatedly attached and detached.

[0097] As shown in Figure 11, when peel strength measurements were repeated three times using sample S2, in which the attachment part 31 is made of hook tape (hook-and-loop fastener), no decrease in peel strength was observed in either the longitudinal or widthwise direction. On the other hand, when peel strength measurements were repeated three times using sample S6, in which the attachment part 31 is made of an adhesive surface, it became clear that the peel strength gradually decreased in both the longitudinal and widthwise directions. From the results in Figure 11, it was confirmed that by making the attachment part 31 of the auxiliary napkin 1 out of hook tape (hook-and-loop fastener), it is possible to repeatedly attach and detach the attachment part 31 to the sanitary napkin 2. Since the auxiliary napkin 1 is a consumable item, it is sufficient if the attachment part 31 can be attached and detached a few times. Therefore, as shown in sample 2 in Figure 11, if the peel strength does not decrease after about three attachment and detachment operations, there is no practical problem.

[0098] Furthermore, as shown in Figure 1, in the longitudinal direction, the attachment portion 31 is provided at a predetermined distance from the outer edge of the auxiliary napkin 1. In other words, in the longitudinal direction, a predetermined gap (distance) is provided between one end (e.g., the front side) of the attachment portion 31 and one end (e.g., the front side) of the auxiliary napkin 1. In this gap, since no bonding force from the attachment portion 31 is acting, the non-skin side of the auxiliary napkin 1 and the skin side of the sanitary napkin 2 are not joined. That is, even when the auxiliary napkin 1 is attached to the sanitary napkin 2, in this gap, the non-skin side of the auxiliary napkin 1 is lifted in the thickness direction from the skin side of the sanitary napkin 2. Therefore, when removing the auxiliary napkin 1 from the sanitary napkin 2, this gap becomes a "grabbing portion" of the auxiliary napkin 1, making it easier for the user to grasp this gripping portion and pull the auxiliary napkin 1. This makes it easy to attach and detach the auxiliary napkin 1.

[0099] However, it is not necessary to provide a gap between the attachment portion 31 and the outer edge of the auxiliary napkin 1 in the longitudinal direction. With this configuration, the engagement force of the attachment portion 31 becomes greater, making it easier to securely fix the auxiliary napkin 1 to the skin side of the sanitary napkin 2 when attaching it. Therefore, even when the user walks or exercises while wearing the auxiliary napkin 1 and sanitary napkin 2, it is less likely that the auxiliary napkin 1 will shift position.

[0100] Furthermore, as shown in Figure 1, the auxiliary napkin 1 has a pair of attachment parts 31, 31 on both outer sides of the central position CI in the width direction. That is, there is no attachment part 31 in the central part in the width direction. Therefore, in the auxiliary napkin 1 of this embodiment, the rigidity in the central part in the width direction is lower than the rigidity in the parts on both sides (the parts where the attachment parts 31 are provided).

[0101] When a user (wearer) puts on the auxiliary napkin 1, the auxiliary napkin 1 usually undergoes three-dimensional deformation in accordance with the contours of the wearer's body shape. In the auxiliary napkin 1 of this embodiment, as described above, the rigidity in the central part in the width direction is lower than the rigidity on both sides thereof, so the auxiliary napkin 1 is prone to bending and deforming in the width direction along the central position CI in the width direction. Specifically, when the auxiliary napkin 1 is put on, it is prone to deforming into a roughly mountain-shaped form in which the central position CI in the width direction is convex toward the skin in the thickness direction. In this way, the central part in the width direction deforms convex toward the skin, making it easier for the auxiliary napkin 1 to come into contact with the wearer's vagina, etc., improving the fit when worn and making it easier to absorb menstrual blood and other excretory fluids.

[0102] Furthermore, the auxiliary napkin 1 may have a crease already formed by folding it in the width direction at the central position CI in the width direction. In other words, the auxiliary napkin 1 may have a folding guide line that extends longitudinally along the central position CI in the width direction. Providing such a folding guide line (crease) makes it easier to create a more natural convex deformation when the auxiliary napkin 1 is worn, as described above. In addition, by packaging the auxiliary napkin 1 in a state where it is folded in half in the width direction along the folding guide line, the individual packaging of the auxiliary napkin 1 can be made compact. In this way, the user can easily carry the auxiliary napkin 1 in a bag, etc., making it easier to change only the auxiliary napkin 1 in a restroom while out.

[0103] Furthermore, the auxiliary napkin 1 has a liquid-impermeable backsheet 14 on the non-skin side of the absorbent core 10 in the thickness direction. Therefore, even when the absorbent core 10 absorbs menstrual blood, the backsheet 14 restricts the movement of menstrual blood from the skin side to the non-skin side in the thickness direction. As a result, when the auxiliary napkin 1 is used layered on the skin side of the sanitary napkin 2, the movement of menstrual blood absorbed by the absorbent core 10 of the auxiliary napkin 1 to the absorbent core 20 of the sanitary napkin 2 is suppressed. Consequently, the absorbent core 20 of the sanitary napkin 2 becomes less likely to get soiled, and the sanitary napkin 2 can be made to last longer.

[0104] <Regarding the sanitary napkins in question (item 2)> Here, we will describe the sanitary napkin 2 to which the auxiliary napkin 1 of this embodiment is attached. The auxiliary napkin 1 of this embodiment can be used with a sanitary napkin 2 that has an adhesive portion 41 having a predetermined peel strength. Specifically, it can be used with a sanitary napkin 2 to which the average force applied when peeling the sanitary napkin 2 from the cotton test cloth (Kanakin No. 3) along the longitudinal direction of the sanitary napkin 2, after attaching the entire area in the width direction and a 50 mm area in the longitudinal direction of the unused adhesive portion 41 to the cotton test cloth (Kanakin No. 3) conforming to JIS L 0803, is 2.87 N or more and 13.12 N or less.

[0105] Figure 12 is a diagram illustrating the method for evaluating the peel strength of the adhesive portion 41 of a sanitary napkin 2. Figure 13 is a table showing the results of measuring the peel strength of the adhesive portion 41 for several types of sanitary napkins 2.

[0106] The peel strength of the adhesive portion 41 of the sanitary napkin 2 can be measured in substantially the same manner as the peel strength measurement method described in Figure 9. First, several types of commercially available sanitary napkins are prepared, and each is cut to a predetermined length (for example, 90 mm) in the longitudinal direction to create a sample. In this embodiment, ten types of samples, X1 to X10, which differ in type and size (length in the longitudinal direction), were prepared as sanitary napkins 2 intended for use, and the peel strength was measured for each. The following explanation will use the measurement of sample X1 as an example.

[0107] For the sample X1 of the sanitary napkin 2, which has been cut to a predetermined length, place it on a horizontal surface with the side containing the adhesive portion 41 facing upwards, ensuring that no wrinkles are created on the surface. Ensure that the adhesive portion 41 of the sample X1 is unused and that it is not touched during the measurement.

[0108] Next, the mounting member S is placed on top of the sample X1 in the thickness direction. As the mounting member S, "cotton" (also called "Kanakin No. 3") from the attached white cloth for testing in accordance with JIS L 0803 is used. Details of Kanakin No. 3 are publicly known, so an explanation is omitted here.

[0109] Next, the airbag 72 is placed on the upper side of the mounting member S (Kanakin No. 3) in the thickness direction, and the fixing plate 71 is placed on top of the airbag 72 and fixed in place. In this state, compressed air is supplied to the airbag 72 and pressurized at a pressure of 300 mmHg for 1 minute. As a result, a uniform compressive force is applied in the thickness direction to the sample X1 and the mounting member S between the fixing plate 71 (and airbag 72) and the base, and the adhesive part 41 of the sample X1 is firmly attached to the mounting member S.

[0110] After the adhesive portion 41 is attached to the member to be attached S, the fixing plate 71 and airbag 72 are removed, and cloth tape is attached to the predetermined positions on the sample X1 and the member to be attached S to form gripping portions for when the tensile testing machine is used to pull them. Then, the gripping portion of the member to be attached S is grasped by one gripping side (not shown) of the tensile testing machine, and the gripping portion of the sample X1 is grasped by the other gripping side (not shown) of the tensile testing machine. At this time, the distance between the gripping sides of the tensile testing machine (distance between one side and the other side) is 20 mm.

[0111] Then, both are pulled along the longitudinal direction of sample X1 (sanitary napkin 2) at a speed of 300 m / min, and the average load (N) applied until a 50 mm long area of ​​the adhesive portion 41 of sample X1 peels off from the attached member S is measured. The same measurement is performed multiple times (for example, 5 times), and the average load is calculated to be the peel strength of the adhesive portion 41 in the longitudinal direction.

[0112] The peel strength of the adhesive portion 41 was measured for each of the samples X1 to X10 in this manner, and the data shown in Figure 13 was obtained. In Figure 13, length (mm) represents the length in the longitudinal direction of each sanitary napkin 2 before cutting (napkin size), and average load (N) represents the peel strength of each sanitary napkin 2 obtained by the above measurement. As a result, the maximum value of the peel strength of the adhesive portion 41 was 13.12 N (sample X6), and the minimum value was 2.87 N (sample X3).

[0113] For each of the sanitary napkins 2 corresponding to samples X1 to X10, the peel strength of the adhesive portion 41 explained in Figures 7 to 10 is compared with the peel strength of the attachment portion 31 of the auxiliary napkin 1. In all cases, the peel strength of the attachment portion 31 (auxiliary napkin 1) is adjusted so that the peel strength of the attachment portion 31 is weaker than the peel strength of the adhesive portion 41. As a result, when the auxiliary napkin 1 is attached to a sanitary napkin 2 whose adhesive portion 41 peel strength is at least 2.87 N and 13.12 N or less, the above-described relationship between the peel strength of the adhesive portion 41 and the peel strength of the attachment portion 31 can be satisfied. In other words, an auxiliary napkin 1 that is easy to attach to and detach from the sanitary napkin 2 can be realized. ===Other Examples===

[0114] The embodiments of the present invention have been described above, but these embodiments are intended to facilitate understanding of the present invention and are not intended to limit its interpretation. Furthermore, the present invention can be modified or improved without departing from its spirit, and it goes without saying that the present invention includes equivalents thereof. [Explanation of symbols]

[0115] 1. Assisted sanitary napkin, 1A First auxiliary napkin, 1B Second auxiliary napkin (attached member), 2. Sanitary napkins, 2C Napkin body, 2W Wing part, 10 absorbent material, 11 Top seat, 12 Middle seat, 13 Side seats, 14 Back seat, 20 absorbent material, 21 Top seat, 22 Second seat, 23 Side flaps, 24 back seats, 31 Mounting part, 41 Adhesive part, 42 Wing adhesive part, 70 Airbag pressurizer, 71 Fixing plate, 72 Airbag, F1 First fold, F2 Second fold, S Member to be attached

Claims

1. A napkin set comprising a sanitary napkin and an auxiliary napkin used by attaching it to the skin side of the sanitary napkin, The aforementioned supplemental napkin has an absorbent core and a liquid-impermeable back sheet positioned on the non-skin side of the absorbent core. The non-skin side of the back sheet is provided with an attachment portion for attaching the auxiliary napkin to the skin side of the sanitary napkin. The non-skin side of the aforementioned sanitary napkin is provided with an adhesive portion for securing the sanitary napkin to the user's underwear. The average value of the force applied when peeling the auxiliary napkin from the second auxiliary napkin along the longitudinal direction of the auxiliary napkin, after attaching the entire area of ​​the unused attachment portion to the skin side of the second auxiliary napkin having the same configuration as the auxiliary napkin, is: Of the unused adhesive portion, the entire area in the width direction and a 50 mm area in the longitudinal direction are attached to the skin-facing side of the second auxiliary napkin, and the force required to peel the sanitary napkin from the second auxiliary napkin along the longitudinal direction of the sanitary napkin is smaller than the average force required. The aforementioned back sheet is configured to prevent menstrual blood from moving from the skin side to the non-skin side. The aforementioned mounting portion is made of hook-and-loop fasteners. In the width direction, a predetermined distance is provided between one end of the mounting portion and one end of the auxiliary napkin, and between the other end of the mounting portion and the other end of the auxiliary napkin. The aforementioned sanitary napkin has a pair of wing portions extending outwards in the width direction from the longitudinal central region of the napkin body, In the width direction, the length of the auxiliary napkin is greater than the length of the absorbent material provided in the sanitary napkin. A napkin set characterized by the following features.

2. A napkin set according to claim 1, The average value of the force applied when peeling the auxiliary napkin from the second auxiliary napkin along the width direction, after attaching the entire area of ​​the unused attachment portion to the skin side of the second auxiliary napkin, is: A napkin set characterized in that, of the unused adhesive portion, the entire area in the width direction and a 50 mm area in the longitudinal direction are attached to the skin side of the second auxiliary napkin, and then the force required to peel the sanitary napkin from the second auxiliary napkin along the width direction of the sanitary napkin is smaller than the average force required.

3. A napkin set according to claim 1 or 2, The length of the auxiliary napkin in the longitudinal direction is A napkin set characterized by having a length shorter than the length of the aforementioned sanitary napkin in the longitudinal direction.

4. A napkin set according to any one of claims 1 to 3, The sanitary napkin has a first fold and a second fold, which serve as folds when packaging the sanitary napkin, provided at different positions along the longitudinal direction of the sanitary napkin. The length of the auxiliary napkin in the longitudinal direction is A sanitary napkin set characterized in that the distance between the first fold and the second fold is longer than the distance in the longitudinal direction of the sanitary napkin.

5. A napkin set according to any one of claims 1 to 4, A sanitary napkin set characterized in that the color of the sanitary napkin and the color of the supplementary napkin are different.

6. A napkin set according to any one of claims 1 to 5, A napkin set characterized in that the color of the auxiliary napkin is a color that falls within the range of hue numbers 4 to 9 on the Ostwald color wheel.

7. A napkin set according to any one of claims 1 to 6, A sanitary napkin set characterized in that the attachment part is detachably attached to the skin-facing side of the sanitary napkin.

8. A napkin set according to any one of claims 1 to 7, A napkin set characterized in that, in the longitudinal direction, a predetermined gap is provided between one end of the mounting portion and one end of the auxiliary napkin.

9. A napkin set according to any one of claims 1 to 7, A napkin set characterized in that, in the longitudinal direction, there is no gap between one end of the attachment portion and one end of the auxiliary napkin.

10. A napkin set according to any one of claims 1 to 9, A napkin set characterized in that the attachment portion is not provided in the central part of the auxiliary napkin in the width direction.

11. A napkin set according to claim 10, A napkin set characterized in that a folding guide line extending in the longitudinal direction is provided in the central part of the width direction of the auxiliary napkin.

12. A napkin set according to any one of claims 1 to 11, A sanitary napkin set characterized in that, of the unused adhesive portion of the sanitary napkin, the entire area in the width direction and a 50 mm area in the longitudinal direction of the sanitary napkin are attached to the cotton of a test cloth attached in accordance with JIS L 0803, and then the auxiliary sanitary napkin is attached to the skin side of the sanitary napkin, where the average force required when peeling the sanitary napkin from the cotton of the test cloth attached along the longitudinal direction of the sanitary napkin is 2.87 N or more and 13.12 N or less, and then used.

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