Absorbent article
Patent Information
- Application Number
- JP2024021749
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-02-16
- Publication Date
- 2026-01-15
AI Technical Summary
Absorbent articles with wings and hip guards often peel off from underwear due to deformation during wear, causing discomfort and leakage, especially when worn for extended periods.
The absorbent article is designed with specific adhesive configurations and constricted portions between wings and hip guards, along with strategically positioned adhesive-free regions to reduce deformation and peeling, ensuring a comfortable fit and preventing leakage.
The design provides comfort and reduces peeling and leakage even during vigorous movements, maintaining a secure fit and effective liquid absorption over extended wear times.
Smart Images
Figure 00000000_0000_ABST
Abstract
Description
[Technical Field]
[0001] The present invention relates to absorbent articles such as sanitary napkins. [Background technology]
[0002] Generally, the back surface of a sanitary napkin is provided with a stopper (also called an adhesive part) for fixing the sanitary napkin to underwear.
[0003] Patent Documents 1 to 3 describe absorbent articles having a main body, wings, and hip guards, with a plurality of adhesive portions extending in the longitudinal direction of the absorbent article arranged at intervals along the longitudinal direction on the back side of the main body. Patent Document 1 describes that a plurality of adhesive portions covered with a rear release liner are arranged along the longitudinal direction of the article and spaced apart in the width direction, and that the front end of the adhesive portion arranged at the center in the width direction is positioned forward of the front end of the adhesive portion arranged on the outer side in the width direction so that the rear release liner can be smoothly released from the front side of the absorbent article. Patent Document 2 describes that a low basis weight portion is provided between two adjacent adhesive portions spaced apart in the longitudinal direction to prevent the adhesive portions from separating from the underwear. Patent Document 3 describes that a low basis weight portion is provided to reduce rigidity so as to prevent discomfort to the wearer when lying down, and the low basis weight portion is arranged between two adjacent adhesive portions spaced apart in the longitudinal direction. [Prior art documents] [Patent documents]
[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-171559 [Patent Document 2] Japanese Patent Application Laid-Open No. 2017-176449 [Patent Document 3] International Publication No. 2016 / 103774 Summary of the Invention [Problem to be solved by the invention]
[0005] Although absorbent articles with wings and hip guards are generally used at night, such as when sleeping, they are increasingly being used in situations where it is not possible to change the absorbent article during the day on busy days, in the hope of preventing leakage from the buttocks. However, in such situations, when worn, the underwear fabric can be significantly deformed by the wearer's movements, such as walking, causing the adhesive portions on the wings and hip guards to peel off from the underwear, deforming the absorbent article, and causing the edges of the absorbent article to come into contact with the wearer's groin or buttocks, causing discomfort when worn.
[0006] The object of the present invention is to provide an absorbent article that is comfortable to wear even when worn for a long period of time. [Means for solving the problem]
[0007] An absorbent article according to one aspect of the present invention includes a main body, a pair of wings, and a pair of hip guards. The main body extends along a longitudinal direction corresponding to the front-to-back direction of the wearer, and is divided into a front region, a middle region, and a rear region. The main body has a top sheet, a back sheet, and an absorbent body disposed between the top sheet and the back sheet. The pair of wings extend outward from the intermediate region in the lateral direction corresponding to the left-right direction of the wearer. The pair of hip guards extend laterally outward from the rear region. The absorbent article includes a front adhesive portion, a rear adhesive portion, wing adhesive portions, and a hip guard adhesive portion. The front adhesive portion is disposed on the underwear contact surface of the main body and extends continuously in the vertical direction. The rear adhesive portion is disposed on the underwear contact surface of the main body, and is located behind the front adhesive portion with a spaced portion in between where no adhesive portion is disposed. The wing adhesive portion is disposed on the underwear contacting surface of the wing. The hip guard adhesive portion is disposed on the underwear contact surface of the hip guard. The absorbent article has constricted portions between the wings and the hip guards, where both longitudinal side edges are constricted inward in the horizontal direction. When an imaginary line parallel to the lateral direction is drawn passing through the front end of the hip guard adhesive portion, the front end of the rear adhesive portion is located on the imaginary line or rearward of the imaginary line. The rear portion of the absorbent article, which overlaps vertically with the rear region, has a first region whose horizontal length increases from the front to the rear, and a second region located rearward of the first region and whose horizontal length decreases from the point where it is maximum toward the rear. The separation portion overlaps the first region, and the front end portion of the hip guard adhesive portion is positioned rearward in the longitudinal direction relative to the rear end portion of the front adhesive portion. [Effects of the Invention]
[0008] According to the absorbent article of the present invention, it is possible to provide an absorbent article that is comfortable to wear even when worn for a long period of time. [Brief explanation of the drawings]
[0009] [Figure 1] 1 is a plan view showing an absorbent article according to one embodiment of the present invention, wrapped in an exterior sheet, stretched out on a flat surface after being opened and viewed from the skin side. [Figure 2] FIG. 2 is a plan view of the absorbent article as viewed from the non-skin side. [Figure 3] FIG. 2 is a plan view of an absorbent core that constitutes a part of the absorbent article. [Figure 4] FIG. 2 is a cross-sectional view of the absorbent article taken along line VI-VI in FIG. [Figure 5] FIG. 2 is a cross-sectional view of the absorbent article taken along line VV in FIG. [Figure 6] FIG. 1A is a partially enlarged plan view of the absorbent article as seen from the non-skin side, and FIGS. 1B to 1D are partially enlarged plan views of absorbent articles according to modified examples as seen from the non-skin side. [Figure 7] 10(A) to 10(D) are partially enlarged plan views of absorbent articles according to modified examples, as viewed from the non-skin side. [Figure 8] FIG. 2 is a plan view of the absorbent article illustrating the force applied to the absorbent article by the walking action of the wearer. [Figure 9] 1 is a schematic diagram showing the state of a wearer wearing an absorbent article according to the present invention when walking. [Figure 10] FIG. 10 is a plan view of an absorbent article having standing gathers according to another embodiment of the present invention, as viewed from the skin side. DETAILED DESCRIPTION OF THE INVENTION
[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In each drawing, mutually orthogonal coordinate axes, that is, X-axis, Y-axis, and Z-axis, are appropriately shown. In the following description, the same reference numerals will be used for components already mentioned, and the description may be omitted.
[0011] <Overall structure of absorbent article>
[0012] An absorbent article 1 according to one embodiment of the present invention is configured as a sanitary napkin and will be referred to hereinafter as the napkin 1. The napkin 1 has a longitudinal direction X corresponding to the front-to-back direction of the wearer and a transverse direction Y corresponding to the left-to-right direction of the wearer and perpendicular to the longitudinal direction X. Furthermore, the napkin 1 has a thickness direction Z perpendicular to both the longitudinal direction X and the transverse direction Y. In this specification, with respect to the thickness direction Z, the side closest to the wearer's skin may be referred to as the upper or skin side, and the side closest to the underwear may be referred to as the lower or non-skin side. In this specification, the term "plan view" refers to a plan view seen from the thickness direction Z. In this specification, "inner side in the transverse direction Y" means closer to the transverse direction Y toward the longitudinal centerline CL that bisects the transverse direction Y of the napkin 1, and "outer side in the transverse direction Y" means farther away from the longitudinal centerline CL in the transverse direction Y. The "inner side in the longitudinal direction X" means approaching the longitudinal direction X toward the horizontal center line that bisects the longitudinal direction X of the napkin 1, and the "outer side in the longitudinal direction X" means moving away in the longitudinal direction X toward the horizontal center line that bisects the longitudinal direction X of the napkin 1. In this specification, the "front end" refers to the frontmost part in the longitudinal direction X, i.e., the front end, and the "rear end" refers to the rearmost part in the longitudinal direction X, i.e., the rearmost end. The napkin 1 may be used while sleeping, and may have a length of 290 mm or more along the longitudinal direction X. The maximum length (total length) of the napkin 1 in the longitudinal direction X is 300 mm, and the maximum length (total width) in the horizontal direction is 160 mm.
[0013] As shown in FIG. 1, the absorbent article 1 includes a main body M, a pair of wings W, and a pair of hip guards H.
[0014] The main body M extends in a strip shape along the longitudinal direction X, and is fixed to the inner surface of the wearer's underwear when worn. The main body M is divided along the longitudinal direction X into a front region M1, a middle region M2, and a rear region M3. The middle region M2 includes an excretory part-facing region that faces the wearer's excretory part when worn. The excretory part-facing region is located at the center of the middle region M2 in the lateral direction Y. When the absorbent article is a napkin 1, the excretory part is the vaginal opening. The middle region M2 is the region where the wings W are provided. The front region M1 is a region that is disposed in front of the middle region M2 (on the wearer's ventral side) and faces the front of the wearer's excretory area when worn. The rear region M3 is an area located behind the middle region M2 (on the back side of the wearer) and faces the rear of the wearer's excretory area when worn. The rear region M3 is an area where a hip guard H is provided. The term "when worn" as used herein means a state in which the normal, proper wearing position (the expected wearing position of the napkin 1) is maintained, and does not include a state in which the napkin 1 is shifted from that wearing position.
[0015] The main body M extends along the longitudinal direction X and is placed on the inner surface of the wearer's underwear. The main body M has the function of absorbing liquids (hereinafter also referred to as "liquid") such as menstrual blood of the wearer.
[0016] The pair of wings W extend outward in the lateral direction Y from the middle region M2 of the main body M. The wings W extend outward in the lateral direction from the underwear between the wearer's crotch, then fold inward and fasten to the outer surface of the underwear. This prevents the middle region M2 of the main body M from slipping out of the wearer's crotch.
[0017] The wings W are provided over the entire length in the longitudinal direction X in the middle region M2 of the main body M. In the napkin 1 according to this embodiment, the position of the middle region M2 in the main body M corresponds to the position of the wings W, and the middle region M2 is defined as the portion of the main body M where the wings W are provided. The front and rear ends of the wings W are the starting points for extension in the lateral direction Y at the front and rear, respectively, of the wings W.
[0018] The pair of hip guards H extend outward in the horizontal direction Y from the rear region M3 of the main body M and partially encase the buttocks inside the wearer's underwear. The hip guards H are located behind the wings W. In the napkin 1 according to this embodiment, the hip guards H are provided over the entire length of the rear region M3 in the vertical direction X, the position of the rear region M3 on the main body M corresponds to the position of the hip guards H, and the rear region M3 is defined as the portion of the main body M where the hip guards H are provided.
[0019] As shown in Fig. 1, the napkin 1 has constricted portions 11 between the wings W and the hip guards H, where the left and right side edges 1S along the longitudinal direction X are constricted inward in the lateral direction Y. In the napkin 1 according to this embodiment, the front end of the hip guards H coincides with the rear end of the wings W.
[0020] Referring to FIG. 2, the portion of the napkin 1 overlapping with the rear region M3 in the longitudinal direction X is referred to as the rear portion 80. The rear portion 80 includes the rear region M3 of the main body M and a pair of hip guards H. The rear portion 80 has a first region 21 and a second region 22. In the rear portion 80, the first region 21 is a region in which the length (width) of the napkin 1 in the lateral direction Y gradually increases from the front to the rear. In the napkin 1, the width of the napkin 1 gradually increases from the front end 81 of the rear portion 80 (corresponding to the boundary between the middle region M2 and the rear region M3) toward the rear. The second region 22 is located behind the first region 21 and is a region in which the width of the napkin 1 gradually decreases toward the rear from the point where the width is maximum. As shown in FIG. 2, in the napkin 1, the width of the rear portion 80 is greatest at the boundary between the first region 21 and the second region 22 (in other words, the width of the pair of hip guards H is greatest).
[0021] In this embodiment, the rear portion 80 has a shape in which the second region 22 is located immediately behind the first region 21, but there may be a third region between the first region 21 and the second region 22, in which the width of the napkin 1 does not change from the front to the rear. In this case, the third region is the part of the rear portion 80 where the width is maximum.
[0022] As shown in Figures 1, 2, 4 and 5, the napkin 1 comprises a topsheet 2, an absorbent body 4, a backsheet 3 and a pair of sidesheets 5. In the main body M, the napkin 1 has a configuration in which the backsheet 3, absorbent body 4 and topsheet 2 are laminated in the thickness direction Z. These components are appropriately joined and integrated, for example, by bonding with an adhesive or heat sealing, or by compression processing using the round compressed grooves 6 and first horizontal compressed grooves 12.
[0023] The top sheet 2 is disposed above the absorbent body 4 in the thickness direction Z. A pair of side sheets 5 extend in the longitudinal direction X and are disposed on both left and right sides of the top sheet 2. The side sheets 5 are provided over both left and right sides of the main body M, the wings W, and the hip guards H. The side sheets 5 are joined to the top sheet 2, for example, by an adhesive 9. The back sheet 3 is disposed below the absorbent body 4 in the thickness direction Z. The back sheet 3 is provided over the entire main body M, the wings W, and the hip guards H. Both the top sheet 2 and the side sheets 5 are located on the back sheet 3. The back sheet 3 is joined to the top sheet 2 and the side sheets 5, for example, at its periphery, by an adhesive, heat sealing, etc.
[0024] The top sheet 2 is made of a highly liquid-permeable sheet material so that it can efficiently absorb liquids such as menstrual blood from the top surface. On the other hand, the back sheet 3 and side sheets 5 are made of a less liquid-permeable sheet material so that liquids absorbed from the top sheet 2 do not easily leak out. The top sheet 2, back sheet 3, and side sheets 5 can be made of materials similar to those conventionally used in the relevant technical field, without any particular restrictions. For example, the top sheet 2 can be made of a liquid-permeable nonwoven fabric or a perforated film. The back sheet 3 can be made of a liquid-impermeable film made of synthetic resin, or a water-repellent nonwoven fabric with high water pressure resistance, such as a spunbond-meltblown-spunbond laminated nonwoven fabric. The side sheets 5 can be made of a water-repellent nonwoven fabric with high water pressure resistance, such as a spunbond-meltblown-spunbond laminated nonwoven fabric.
[0025] The backsheet 3 is provided with adhesive portions 31-34 for fixing the main body M, wings W, and hip guards H to underwear. The non-skin side of the napkin 1 on which the adhesive portions 31-34 are provided is referred to as the underwear-contacting surface 3a. As shown in FIG. 5, the wings W are formed by laminating a side sheet 5 and a backsheet 3 in the thickness direction Z, and the underwear-contacting surface of the wings W corresponds to the non-skin side of the backsheet 3. As shown in FIG. 4, the hip guard H is formed by laminating a side sheet 5 and a backsheet 3 in the thickness direction Z, and the underwear-contacting surface of the hip guard H corresponds to the non-skin side of the backsheet 3. The underwear-contacting surface of the main body M corresponds to the non-skin side of the backsheet 3. The adhesive portions 31-34 will be described later.
[0026] The absorbent body 4 extends in the longitudinal direction X and is disposed between the topsheet 2 and the backsheet 3. The absorbent body 4 absorbs liquid from the surface facing the topsheet 2 and diffuses the liquid internally to retain it. The absorbent body 4 may be any material that has been conventionally used in the relevant technical field without any particular restrictions. In the napkin 1, the absorbent body 4 has an absorbent core 7 and a core wrap sheet 8. The absorbent core 7 may be formed of a fiber aggregate made of hydrophilic fibers such as pulp fibers, or may have a configuration in which a water-absorbing polymer is held in the fiber aggregate. The absorbent core 7 will be described later. The core wrap sheet 8 covers the absorbent core 7 and has the function of, for example, maintaining the shape of the absorbent core 7. The core wrap sheet 8 is formed, for example, from thin, soft paper such as tissue paper or a liquid-permeable nonwoven fabric.
[0027] <Detailed configuration of absorbent article>
[0028] In this embodiment, the napkin 1 can be made comfortable to wear by defining the positional relationship between the front adhesive portion 31, the rear adhesive portion 32, and the hip guard adhesive portion 34. This will be explained in detail below.
[0029] [Adhesive part] 2, the napkin 1 is provided with a pair of front adhesive portions 31 arranged on the underwear-contacting surface 3a and spaced apart in the lateral direction Y, a pair of rear adhesive portions 32 arranged on the underwear-contacting surface 3a and spaced apart in the lateral direction Y, a pair of wing adhesive portions 33, and a pair of hip guard adhesive portions 34. These adhesive portions are formed by applying an adhesive such as a hot-melt adhesive to the underwear-contacting surface 3a of the backsheet 3.
[0030] (Front adhesive part and rear adhesive part) The pair of front adhesive portions 31 and the pair of rear adhesive portions 32 have the function of fixing the main body M to the inner surface of the wearer's underwear. In the napkin 1, the front adhesive portions 31 and the rear adhesive portions 32 are present in the region where the absorbent body 4 is present in a plan view. The front adhesive portion 31 extends continuously in the vertical direction X over a part of the front region M1, the middle region M2, and a part of the rear region M3. The front adhesive portions 31 are provided in a pair, one on each side of the vertical center line CL. The rear adhesive portion 32 extends continuously toward the rear of the rear region M3 in the vertical direction X. The rear adhesive portions 32 are provided in a pair, one on each side of the vertical center line CL. On the underwear contact surface 3a, the pair of rear adhesive portions 32 are arranged rearward of the pair of front adhesive portions 31 in the longitudinal direction X, with a separation portion 35 interposed therebetween. The separation portion 35 is a portion where no adhesive portion exists between the pair of front adhesive portions 31 and the pair of rear adhesive portions 32. In other words, the front adhesive portions 31 and the rear adhesive portion 32 are separated in the longitudinal direction X. Both the front adhesive portion 31 and the rear adhesive portion 32 have a rectangular shape that is long in the longitudinal direction X. In the napkin 1, the range of the separation portion 35 is a rectangular portion having four vertices: a vertex located on the outer side in the lateral direction Y at the rear of each of the pair of rectangular front adhesive portions 31, and a vertex located on the outer side in the lateral direction Y at the front of each of the pair of rectangular rear adhesive portions 32. When worn, the separation portion 35 is located in the vicinity of the wearer's anus.
[0031] (Wing adhesive part) A pair of wing adhesive portions 33 are arranged on each of the pair of wings W. The wing adhesive portions 33 have the function of fixing the folded wing W to the outer surface of the wearer's underwear. The wing adhesive portion 33 is divided into three in the horizontal direction Y, and is configured by three vertical adhesive portions 330 extending in the vertical direction X and provided intermittently in the horizontal direction Y. All three vertical adhesive portions 330 have a rectangular shape that is long in the vertical direction X. The wing adhesive portion 33, which is an assembly of the three vertical adhesive portions 330, has an overall rectangular shape.
[0032] (Hip guard adhesive part) As shown in Figures 2 and 6(A), a pair of hip guard adhesive portions 34 are arranged on each of a pair of hip guards H. The hip guard adhesive portions 34 have the function of fixing the hip guard H to the inner surface of the wearer's underwear. The hip guard adhesive portion 34 is divided into three portions in the horizontal direction, and three vertical adhesive portions 340 extending in the vertical direction X are provided intermittently in the horizontal direction Y. All three vertical adhesive portions 340 are long in the vertical direction X and have a rectangular shape with the same dimensions in both the vertical direction X and the horizontal direction Y. The dimensions of the three vertical adhesive portions 340 do not have to be the same, but it is preferable that they are approximately the same. "Approximately the same" means that the difference in the average dimensions of each vertical adhesive portion 340 is within 10%.
[0033] In the napkin 1 of this embodiment, the three vertical adhesive portions 340 are arranged so that their front ends are gradually shifted rearward toward the inside in the lateral direction Y. The overall shape of the hip guard adhesive portion 34 can be regarded as a substantially trapezoid. In the napkin 1, the three vertical adhesive portions 340 are arranged so that their rear ends are gradually shifted rearward toward the inside in the lateral direction Y, so the overall shape of the hip guard adhesive portion 34 can be regarded as a substantially parallelogram. The front edge 341 (the edge corresponding to the front side of the trapezoid or parallelogram) is inclined with respect to the lateral direction Y. In detail, the front edge 341 is inclined obliquely rearward toward the inside in the lateral direction Y of the napkin 1.
[0034] As shown in FIG. 2 , the hip guard adhesive portion 34 is disposed in a region where the width of the rear portion 80 of the napkin 1 is greatest (in other words, where the width of the pair of hip guard adhesive portions 34 is greatest). In the napkin 1, the hip guard adhesive portion 34 is disposed continuously in the longitudinal direction X from the first region 21 to the second region 22, and is located in both the first region 21 and the second region 22. In other words, the hip guard adhesive portion 34 is disposed on the hip guard H so as to pass through the region where the width of the rear portion 80 is greatest and extend continuously in both the front and rear directions. Typically, the hip guard adhesive portion 34 is disposed so that its approximate center in the longitudinal direction X is located in the region where the width of the rear portion 80 is greatest (in this embodiment, the boundary between the first region 21 and the second region 22). Here, the center of the hip guard adhesive portion 34 in the longitudinal direction X refers to the center of the length in the longitudinal direction X of a straight line connecting the frontmost end and the rearmost end of the hip guard adhesive portion 34. Therefore, when the front edge 341 of the hip guard adhesive portion 34 is inclined as shown in Figure 2, this corresponds to the center in the longitudinal direction X of the line connecting the foremost end of the front edge 341, which is located at the forefront, and the rearmost end of the rear edge (the edge corresponding to the rear side of the generally trapezoidal or generally parallelogrammatic hip guard adhesive portion), which is located at the rearmost end. This configuration effectively prevents the left and right side edges HS of the hip guard H from rolling up when worn. Note that when the pair of hip guard adhesive portions 34 has a shape in which a third region, whose width does not change along the longitudinal direction X, is between the first region 21 and the second region 22, the hip guard adhesive portion 34 is typically positioned so that the center of the third region in the longitudinal direction X coincides with approximately the center of the hip guard adhesive portion 34 in the longitudinal direction X. Here, "approximately the center" means the point (center) that divides the length of the vertical direction X of the relevant area (hip guard adhesive portion 34, third area) into two equal parts, or it may be shifted forward or backward in the vertical direction X from the center within the range that achieves the above-mentioned effect, in which case the shift amount is preferably 5 mm or less.
[0035] The shapes of the wing adhesive portion 33 and the hip guard adhesive portion 34 are not limited to those described above. For example, the wing adhesive portion 33 and the hip guard adhesive portion 34 may be undivided, or may be divided into two or four or more portions.
[0036] [Positional relationship between rear adhesive part, front adhesive part and hip guard adhesive part] 2 and 6(A), the napkin 1 has a separation portion 35 in which no adhesive portion exists between the front adhesive portion 31 and the rear adhesive portion 32 in the longitudinal direction X. In a plan view, the separation portion 35 overlaps the first region 21. In the longitudinal direction X, the position of the front end portion 34a of the hip guard adhesive portion 34 in the longitudinal direction X is rearward of the rear end portion 31a of the front adhesive portion 31.
[0037] By positioning the front adhesive portion 31, the rear adhesive portion 32, and the hip guard adhesive portion 34 as described above, an adhesive-free region 36 is provided in the first region 21, where no adhesive portion is present across the entire width in the horizontal direction Y. In the rear portion 80, adhesive-present regions where adhesive portions are present are located in front of and behind the adhesive-free region 36. In the napkin 1 of this embodiment, the length of the adhesive-free region 36 in the vertical direction X is shorter than that of the separation portion 35, and the adhesive-free region 36 includes a portion of the separation portion 35. In the rear portion 80, the adhesive-free region 36 is located in front of the hip guard adhesive portion 34. Referring to FIG. 2 , a cross-shaped adhesive-free region is present in a region surrounding the outer edges of the pair of front adhesive portions 31 and the pair of rear adhesive portions 32 (a region surrounded by connecting the outer vertices of the rectangular adhesive portions 31 and 32 in the vertical direction X and on the outside in the horizontal direction Y). The separation portion 35 corresponds approximately to the horizontal line portion of the cross of the cross-shaped adhesive-free region.
[0038] When the wearer wears the napkin, the underwear worn by the wearer is significantly deformed by movements such as walking. As shown in Fig. 8, the first region 21 of the napkin 1 corresponds to a part of the underwear that is particularly deformed by movements such as walking, and during movement, a twisting force 65 directed diagonally backward from the middle region M2 is likely to be applied to the first region 21 in accordance with the deformation of the underwear.
[0039] As shown in Fig. 9, in the napkin 1 of this embodiment, a separation portion 35 where no adhesive portion exists is provided in the first region 21, which is likely to be subjected to a large twisting force 65 directed diagonally backward from the above-mentioned middle region M2, and an adhesive-free region 36 where no adhesive portion exists across the entire width in the lateral direction Y is provided. The adhesive-free regions of the napkin 1 (separation portion 35 and adhesive-free region 36) are not fixed to the underwear, so as shown in the region surrounded by a circle 91 in Fig. 9, in the adhesive-free region, deformation of the underwear 90 caused by movements such as walking of the wearer P is less likely to be transmitted to the napkin 1, and deformation following the deformation of the underwear 90 is less likely to occur, thereby reducing the force applied to the wing adhesive portions 33 and the hip guard adhesive portions 34 due to deformation of the napkin 1. This prevents peeling of the wing adhesive portions 33 and the hip guard adhesive portions 34, and ultimately prevents the wings W and the hip guard H from rolling up. The napkin 1 can prevent the wing adhesive portion 33 or the hip guard adhesive portion 34 from peeling off due to the wearer's vigorous movements, for example, and the napkin 1 from being unintentionally deformed, causing the edge of the napkin 1 to come into contact with the groin or buttocks and causing discomfort when worn, and can also suppress leakage due to undesirable deformation of the napkin 1.
[0040] As shown in Figure 6(A), an imaginary line 67 is drawn that is parallel to the lateral direction Y and passes through the front end 34a of the hip guard adhesive portion 34. In the napkin 1, the rear adhesive portion 32 is disposed so that its front end 32a is located on the imaginary line 67 or is located behind the imaginary line 67. In the example of the napkin 1 of this embodiment, the front end 32a of the rear adhesive portion 32 is located behind the imaginary line 67.
[0041] In the napkin 1, the areas with adhesive portions have higher rigidity than the areas without adhesive portions, and the boundary between the areas with and without adhesive portions is prone to bending due to the difference in rigidity. In the napkin 1 of this embodiment, the front end 32a of the rear adhesive portion 32 is positioned rearward of the imaginary line 67, and as shown in Figure 6(A), when worn, the difference in rigidity causes the napkin 1 to easily deform along a curve 66 that is convex rearward in a plan view near the boundary between the adhesive-free region 36 and the region behind it. This allows the napkin 1 to deform to fit the shape of the buttocks, enveloping them from the front, back, left and right, and reduces the likelihood of gaps between the hip guard H and the buttocks, improving the fit and effectively suppressing leakage.
[0042] As described above, the presence of the adhesive-free region 36 in front of the hip guard adhesive portion 34 makes the region of the napkin 1 corresponding to the adhesive-free region 36 less likely to deform in response to deformation of the underwear when the wearer moves, making it less likely for the hip guard adhesive portion 34 to peel off. Therefore, the napkin 1 can effectively maintain a state in which a gap is less likely to form between the hip guard H and the buttocks, which is achieved by positioning the front end 32a of the rear adhesive portion 32 rearward of the imaginary line 67.
[0043] In this way, even when worn for a long time, the napkin 1 is comfortable to wear and is unlikely to cause the wearer to feel uncomfortable due to peeling of the wing adhesive portions 33 and hip guard adhesive portions 34 or discomfort due to leakage.
[0044] As shown in FIG. 2, the length of the rear adhesive portion 32 in the vertical direction X may be longer than the length of the hip guard adhesive portion 34 in the vertical direction X, and the position of the rear end portion 32b of the rear adhesive portion 32 in the vertical direction X may be rearward of the rear end portion 34b of the hip guard adhesive portion 34. With this configuration, when worn, the rear edge 1a, which is the rear edge of the napkin 1, deforms along a curve 66 that convexly faces rearward in a planar view as shown in Figure 6(A) described below due to the difference in rigidity between the area with adhesive and the area without adhesive, making it easier for the napkin 1 to conform to the curved surface of the buttocks, and preventing the rear edge 1a of the napkin 1 from rolling up.
[0045] As shown in FIG. 2, the front adhesive portion 31 may be located at the constricted portion 11. With this configuration, the presence of the adhesive portion increases the rigidity of the napkin 1 near the constricted portion 11, making the absorbent body 4 near the constricted portion 11 less likely to deform, and ensuring a good amount of liquid that can be absorbed.
[0046] Furthermore, the front adhesive portion 31 may be arranged to extend continuously from the front region M1 to the middle region M2 and then to the rear region M3, and the position of the separation portion 35 in the vertical direction X may be arranged to be closer to the hip guard adhesive portion 34 than to the wing adhesive portion 33, as shown in FIG. With this configuration, deformation of the absorbent body 4 is suppressed and the amount of liquid that can be absorbed is ensured, while the placement of the adhesive-free area 36 near the hip guard adhesive portion 34 effectively suppresses peeling of the hip guard adhesive portion 34. The above-mentioned "the position of the separation portion 35 is closer to the hip guard adhesive portion 34 than to the wing adhesive portion 33" means that the length in the vertical direction X between the rear end portion 31a of the front adhesive portion 31, which determines the front end position of the separation portion 35, and the front end portion 34a of the hip guard adhesive portion 34 is shorter than the length in the vertical direction X between the rear end portion 31a of the front adhesive portion 31 and the rear end portion 33a of the wing adhesive portion 33.
[0047] Furthermore, napkins with a relatively long overall length (over 290 mm) like the napkin 1 of this embodiment are generally suitable for use when sleeping, when it is easy to lie on one's back. When the wearer lies on their back while wearing the napkin 1, the area near the separation portion 35 is in a position where the wearer's body pressure is likely to be applied. Since the adhesive portion is not present in such a position where body pressure is likely to be applied, the adhesive portion is less likely to remain on the underwear when the napkin is removed from the underwear, making the napkin easier to handle.
[0048] [Positional relationship between the folding part and the separating part] As shown in FIG. 1, a napkin 1 is typically folded together with an exterior sheet 13 disposed on the backsheet 3 side of the napkin 1 to form a compact package convenient for storage and portability. Specifically, as shown in FIG. 1, a laminate is formed by placing the napkin 1 on the exterior sheet 13. Then, the pair of wings W and the pair of hip guards H are folded toward the topsheet 2 along both sides of the main body M in the longitudinal direction X, and the laminate is folded in the longitudinal direction X with the topsheet 2 facing inward to form the package. In the package, a tab tape T, part of which is fixed to the exterior sheet 13 and part of which protrudes, is releasably adhered to the outer surface of the exterior sheet 13, thereby maintaining the shape of the package. As shown in FIGS. 1 and 2, the napkin 1 is folded in three, and has folded portions L1 and L2 extending along the transverse direction Y formed by the folding. The laminate may include additional components other than the exterior sheet and napkin, as needed. For example, the laminate may include a release sheet for covering the wing adhesive portion 33 and the hip guard adhesive portion 34 on the napkin.
[0049] As shown in FIG. 2, the folded portions L1 and L2 are preferably not located in the separation portion 35. The area of the main body M corresponding to the separation portion 35 has a lower rigidity than the area where the adhesive portion is present due to the absence of the adhesive portion. By not providing the folded portions L1 and L2 in the separation portion 35, the decrease in rigidity of the main body M due to folding is suppressed, undesirable deformation such as sagging of the main body M is less likely to occur, and undesirable deformation of the main body M is less likely to extend to the wing adhesive portions 33 and the hip guard adhesive portions 34, further suppressing peeling of the wing adhesive portions 33 and the hip guard adhesive portions 34. Also, as shown in FIG. 2, the absorbent body 4 has a front high basis weight region 72 and a rear high basis weight region 71. However, from the viewpoint of suppressing undesirable deformation of the high basis weight region and ensuring good liquid absorption in the high basis weight region, it is preferable that the folded portions L1 and L2 do not overlap the high basis weight region. The high basis weight region will be described later.
[0050] [Shape of the hip guard adhesive part] In the napkin 1, as shown in Figs. 2 and 6(A), the hip guard adhesive portion 34 has a front edge 341 that is generally inclined obliquely backward and inward in the lateral direction Y.
[0051] In addition to positioning the front end 32a of the rear adhesive portion 32 rearward of the imaginary line 67, the front edge 341 of the hip guard adhesive portion 34 is shaped to slope diagonally rearward inward in the lateral direction Y, which makes it easier to induce the boundary between the adhesive-free region 36 of the napkin 1 and its rear portion to deform along the curve 66 that convex rearward, as shown in Figure 6(A). This makes it less likely that a gap will form between the hip guard H and the buttocks, and more effectively prevents leakage.
[0052] In the napkin 1, as shown in FIG. 6(A), the hip guard adhesive portion 34 is configured as a collection of three vertical adhesive portions 340, and the positions of the front ends of the three vertical adhesive portions 340 are sequentially shifted rearward toward the inside in the lateral direction Y, but this is not limiting.
[0053] 6(B), the positions of the front ends of the three vertical adhesive portions 340 constituting the hip guard adhesive portion 34A in the vertical direction X may all be the same, and the front end edge of the hip guard adhesive portion 34A may be generally parallel to the horizontal direction Y. In the napkin 1A, the front end 32a of the rear adhesive portion 32 is located rearward of the imaginary line 67 passing through the front end 34Aa of the hip guard adhesive portion 34A.
[0054] Furthermore, as shown in Figure 6(C) in the napkin 1B, the positions of the front ends of the three vertical adhesive portions 340 constituting the hip guard adhesive portion 34B may be configured to be shifted forward in order toward the inside in the lateral direction Y, so that the front and rear end edges of the hip guard adhesive portion 34B as a whole are configured to be inclined diagonally forward toward the inside in the lateral direction Y. With this configuration, the vertical adhesive portion 340 located furthest outward in the horizontal direction Y is positioned towards the rear of the napkin 1 overall, thereby preventing the rear edge 1a of the napkin 1 from rolling up near both sides in the horizontal direction Y (near the rear corners of the napkin 1). In the napkin 1B, the front end 32a of the rear adhesive portion 32 is located rearward of an imaginary straight line 67 passing through the front end 34Ba of the hip guard adhesive portion 34B.
[0055] Furthermore, as in napkin 1C in Figure 6(D) and napkin 1D shown in Figure 7(A), the hip guard adhesive portion may be configured as a single hip guard adhesive portion 34C or 34D rather than as a collection of multiple vertical adhesive portions, and its shape may be a parallelogram or a rectangle, and is not particularly limited. In the napkin 1C, the front end 32a of the rear adhesive portion 32 is located behind the imaginary line 67 that passes through the front end 34Ca of the hip guard adhesive portion 34C. In the napkin 1D, the front end 32a of the rear adhesive portion 32 is located behind the imaginary line 67 that passes through the front end 34Da of the hip guard adhesive portion 34D.
[0056] Like the napkin 1, the napkins 1A to 1D are arranged so that the front end 32a of the rear adhesive portion 32 is located rearward of the imaginary line 67. This allows the area around the boundary between the adhesive-free region 36 of the napkin and its rear portion to easily deform along a curve 66 that is convex rearward in a plan view when worn, allowing the napkin 1 to deform so as to wrap around the buttocks in accordance with their shape, making it less likely that a gap will form between the buttocks and the hip guard H.
[0057] In the napkin 1, an example was given in which the front end 32a of the rear adhesive portion 32 was located rearward of the imaginary line 67. As in napkins 1E to 1G shown in Figures 7(B) to 7(D), the front end 32a of the rear adhesive portion 32 may be located on the imaginary line 67 that is parallel to the lateral direction Y and passes through the front end portions 34Aa, 34a, and 34Ba of the hip guard adhesive portions 34A, 34, and 34B, respectively. In the examples of napkins 1E to 1G, the ranges of the separation portion 35 and the adhesive-free region 36 in the longitudinal direction X are the same. It is only necessary that the front end 32a of the rear adhesive portion 32 is not located forward of the imaginary line 67.
[0058] In the examples of napkins 1E to 1G, the front end 32a of the rear adhesive portion 32 is positioned on the imaginary straight line 67, which makes it easier to deform the napkin 1 to wrap around the buttocks in accordance with the shape of the buttocks, compared to when the front end 32a is located forward of the imaginary straight line 67, and makes it less likely that a gap will form between the buttocks and the hip guard H. In order to prevent a gap from occurring between the buttocks and the hip guard H, it is preferable that the front end portion 32a of the rear adhesive portion 32 be positioned rearward of the imaginary line 67, as shown in Figures 6(A) to (D) and 7(A).
[0059] Furthermore, in the napkins 1A to 1G, as in the napkin 1, the vertical width of the rear adhesive portion 32 is longer than the vertical width of the hip guard adhesive portions 34A to 34D, and the position of the rear end portion 32b of the rear adhesive portion 32 in the vertical direction X is positioned further rearward than the rear ends 34Ab, 34Bb, 34Cb, and 34Db of the hip guard adhesive portions 34A to 34D. This allows the vicinity of the rear edge 1a of the napkin 1 to easily conform to the shape of the buttocks, and prevents the rear edge 1a from rolling up.
[0060] [Round compression groove, first horizontal compression groove] As shown in Figure 1, the topsheet 2 may have round compressed grooves 6 and first horizontal compressed grooves 12. As shown in Figures 4 and 5, the round compressed grooves 6 and first horizontal compressed grooves 12 are configured as linear grooves formed by integrally compressing the topsheet 2 to the absorbent core 4 and recessing them toward the backsheet 3. As shown in Figure 1, the round compressed grooves 6 and first horizontal compressed grooves 12 are formed in areas of the skin-side (upper) surface of the topsheet 2 that are not covered by the sidesheet 5. The round compressed grooves 6 are configured to run around the main body M. Note that the term "linear groove" includes both a form in which a compressed groove extends continuously to form a line, and a form in which multiple compressed portions are arranged intermittently and can be regarded as a single linear groove as a whole. With regard to a linear groove, "extending in the longitudinal direction X" or "extending in the transverse direction Y" means that the linear groove extends overall in the longitudinal direction X or transverse direction Y, and also includes a form in which a portion is curved. The compressed grooves are areas that are compressed and compacted, and have higher rigidity than areas that have not been compressed.
[0061] As shown in Figure 1, the round compressed groove 6 has a pair of left and right vertical compressed grooves 61 extending in the vertical direction X, and a front horizontal compressed groove 62 and a rear horizontal compressed groove 63 extending in the horizontal direction Y. The pair of vertical compressed grooves 61 are provided over substantially the entire length of the main body M, from the front region M1 of the main body M, through the middle region M2, to the rear region M3. The front horizontal compressed groove 62 connects the front end portions of the pair of vertical compressed grooves 61, and the rear horizontal compressed groove 63 connects the rear end portions of the pair of vertical compressed grooves 61.
[0062] The first horizontal compressed groove 12 extends in the horizontal direction Y in the rear region M3. The first horizontal compressed groove 12 is located rearward of the front high basis weight region 72 provided in the absorbent core 7, and has an arc shape that convex rearward in plan view, roughly following the shape of the rear end edge of the front high basis weight region 72. The first horizontal compressed groove 12 is shaped to connect to the pair of vertical compressed grooves 61 near the center in the vertical direction X.
[0063] (Positional relationship between the compression groove and the separation part) 2 and 4, the absorbent body 4 may have compressed grooves in the spaced apart portions 35 in a plan view, which form high-rigidity regions through compaction. The spaced apart portions 35 of the main body M have a lower rigidity than the regions with adhesive portions due to the absence of adhesive portions, but the rigidity can be increased by providing compressed grooves that form high-rigidity regions. This makes it less likely that undesirable deformation such as crease will occur in the spaced apart portions 35 of the main body M even when external force is applied to the napkin 1 due to the wearer's vigorous movements, thereby reducing the likelihood of such undesirable deformation affecting the wing adhesive portions 33 and the hip guard adhesive portions 34, and further preventing peeling of the wing adhesive portions 33 and the hip guard adhesive portions 34.
[0064] The compressed grooves provided in the separation portion 35 of the main body M may be a pair of left and right vertical compressed grooves 61 extending in the vertical direction, as shown in Fig. 2. In the region of the napkin 1 corresponding to the separation portion 35, the vertical compressed grooves 61 extend over the entire length of the separation portion 35 in the vertical direction X, substantially overlap in plan view with vertical groove portions 10x provided in the absorbent core 7, which will be described later, and are located on both left and right edges of the separation portion 35. By providing a pair of vertical compressed grooves 61, even if undesirable deformation occurs in the region of the napkin 1 corresponding to the separation portion 35, the force of the undesirable deformation is less likely to reach the hip guard adhesive portion 34, which is located outward in the horizontal direction Y from the pair of vertical compressed grooves 61, and peeling of the hip guard adhesive portion 34 can be further suppressed.
[0065] [Absorbent core] 3, the absorbent core 7 has a rear high basis weight region 71 as a first high rigidity region, a front high basis weight region 72 as a second high rigidity region, and a low basis weight region 73 as a low rigidity region. The low rigidity region is a region in which the basis weight of the constituent fibers of the absorbent body 4 is lower and the rigidity is lower than those of the first and second high rigidity regions. The low basis weight region 73 is provided across the front region M1, the middle region M2, and the rear region M3 of the napkin 1, and is positioned so as to surround each of the rear high basis weight region 71 and the front high basis weight region 72. The front high basis weight region 72 is provided across part of the front region M1, the middle region M2, and part of the rear region M3. The front high basis weight region 72 has a central portion 721 having a vertically elongated rounded rectangular shape in plan view that is long in the longitudinal direction X, and side portions 722 that bulge outward in the transverse direction Y from both side edges of the central portion 721 along the longitudinal direction X. The front high basis weight region 72 is a region in which the basis weight of the constituent fibers is higher than that of its surroundings. The rear high basis weight region 71 is provided in the rear region M3. As shown in Fig. 3, the absorbent core 7 has a gap 75 in the low stiffness region where only the low basis weight region 73 and the grooves 10 are present, between the region where the rear high basis weight region 71 is located and the region where the front high basis weight region 72 is located in the longitudinal direction X. When worn, the front high basis weight region 72 is positioned opposite the excretory area (vaginal opening), and the rear high basis weight region 71 is positioned opposite the intergluteal cleft, and the gap 75 in the low stiffness region allows the napkin 1 to easily deform along the shape of the body to wrap around the buttocks in the longitudinal direction.
[0066] The absorbent core 7 has a plurality of longitudinal grooves 10x, a plurality of lateral grooves 10y, a plurality of front high basis weight blocks 72a, a plurality of rear high basis weight blocks 71a, and a plurality of low basis weight blocks 73a, each of which is defined by a front circumferential groove 10a and a rear circumferential groove 10b. When there is no need to distinguish between the longitudinal grooves 10x, the lateral grooves 10y, the front circumferential grooves 10a, and the rear circumferential grooves 10b, they are referred to as grooves 10. As shown in Figures 4 and 5, the grooves 10 are formed, for example, as recesses extending downward from the upper surface of the absorbent core 7 in the thickness direction Z. The grooves 10 have a lower basis weight of the constituent fibers of the absorbent core 7 (constituent fibers of the absorbent body 4) than the blocks 71a, 72a, and 73a, and are typically thinner. This allows the absorbent core 7 to flexibly deform from the grooves 10, which act as the starting point for deformation.
[0067] The "low basis weight" of the grooves 10 is a concept that includes not only a configuration in which the constituent fibers of the absorbent core 7 are present, but also a configuration in which the constituent fibers are absent. The configuration in which the constituent fibers are present in the grooves 10 is more preferable because the block-shaped portions of the absorbent core 7 located on both sides thereof are connected via the grooves, thereby imparting flexibility while suppressing deformation and breakage of the absorbent core 7.
[0068] The rear high basis weight region 71 is formed by a plurality of (two in this embodiment) rear high basis weight blocks 71a, and its outer shape in plan view is formed by the rear circumferential groove portion 10b. The front high basis weight region 72 is formed by a plurality of (14 in this embodiment) front high basis weight blocks 72a, and its outline in plan view is formed by the front circumferential groove portion 10a. The low basis weight region 73 is formed by a plurality of (54 in this embodiment) low basis weight blocks 73a.
[0069] The rear high basis weight block 71a and the front high basis weight block 72a are regions in which the constituent fibers of the absorbent body 4 have a higher basis weight and higher rigidity than the low basis weight block 73a. In the absorbent core 7, the high-rigidity front high basis weight region 72 is provided facing the excretory area, making the middle region M2 of the main body M less susceptible to unintended deformation and maintaining good liquid absorption of liquid from the excretory area. Furthermore, by providing the front high basis weight region 72 with a higher basis weight, the amount of liquid that can be absorbed can be increased. Furthermore, by providing the high-rigidity rear high basis weight region 71 facing the intergluteal cleft, the rear region M3 of the main body M is less susceptible to unintended deformation and maintaining good liquid absorption of liquid flowing toward the rear of the napkin 1. Furthermore, by providing the rear high basis weight region 71 with a higher basis weight, the amount of liquid that can be absorbed by the napkin 1 can be increased. 4 and 5, the rear high basis weight block 71a and the front high basis weight block 72a are typically thicker than the low basis weight block 73a and protrude upward, thereby improving the fit of the napkin 1 around the excretory area and the buttocks cleft and effectively suppressing liquid leakage.
[0070] In Figure 3, the rear high basis weight block 71a and the front high basis weight block 72a, which have relatively high basis weights, are shown with dense dots, the low basis weight block 73a, which has a low basis weight, is shown with sparse dots, and the groove portion 10, which has an even lower basis weight, is shown as a solid color without any pattern such as dots.
[0071] (Positional relationship between the rear high basis weight region of the absorbent core and the spaced portion) In order to suppress undesirable deformation of the area corresponding to the separation portion 35 of the napkin 1, it is preferable to have the constituent fibers of the absorbent core 7 present in the area corresponding to the separation portion 35 of the napkin 1, as shown in Figures 2 and 3, thereby increasing the rigidity of the absorbent body 4.
[0072] Furthermore, from the viewpoint of further suppressing undesirable deformation of the region of the napkin 1 corresponding to the separation portion 35, it is preferable that the absorbent body 4 has a high-rigidity region with relatively high rigidity in the separation portion 35, and has a region around it with lower rigidity than the high-rigidity region. In the napkin 1 of this embodiment, the high-rigidity region is constituted by a rear high-basis weight region 71 with a high basis weight. In the absorbent body 4, the regions before and after the rear high-basis weight region 71 are low-rigidity regions with lower rigidity than the rear high-basis weight region 71, in which the low-basis weight region 73 consisting of the low-basis weight blocks 73a and the groove portion 10 are present.
[0073] In the napkin 1, the area corresponding to the separation portion 35 has low rigidity due to the absence of an adhesive portion, but by providing the rear high basis weight area 71, the rigidity can be increased.
[0074] In this way, the napkin 1 is provided with a configuration in the separation portion 35 of the absorbent body 4 that provides a high-rigidity region to the absorbent body 4, such as the rear high-basis-weight region 71 and the vertical compressed grooves 61. This configuration makes it less likely for undesirable deformation to occur in the region of the napkin 1 that corresponds to the separation portion 35, and reduces the influence of this undesirable deformation on the wing adhesive portions 33 and the hip guard adhesive portions 34, thereby further suppressing peeling of the wing adhesive portions 33 and the hip guard adhesive portions 34. This reduces the discomfort felt when wearing the napkin 1 due to unintended peeling of the wing adhesive portions 33 and the hip guard adhesive portions 34, and makes it possible to obtain a napkin 1 that is comfortable to wear.
[0075] In plan view, the rear high basis weight region 71, which provides a high stiffness region to the absorbent body 4, preferably does not overlap or only partially overlaps with the front adhesive region 31 and the rear adhesive region 32 in the lateral direction Y in the separation region 35. In the napkin 1 of this embodiment, the rear high basis weight region 71 does not overlap with the front adhesive region 31 and the rear adhesive region 32 in the lateral direction Y. The rear high basis weight region 71 is located between the region where no adhesive portion exists between the pair of rear adhesive regions 32 and the region where no adhesive portion exists between the pair of front adhesive regions 31, and is located near the center of the napkin 1 in the lateral direction Y. The rear high basis weight region 71 is located at the cross intersection of the cross-shaped adhesive-free regions formed by the pair of front adhesive regions 31 and the pair of rear adhesive regions 32.
[0076] Here, in the napkin 1, the cross-shaped adhesive-free region formed by the pair of front adhesive regions 31 and the pair of rear adhesive regions 32 has lower rigidity than the region where adhesive regions are present, and is therefore more susceptible to deformation. In the napkin 1, the intersection of the crosses of the cross-shaped adhesive-free region is susceptible to deformation of both the region corresponding to the horizontal line portion of the cross and the region corresponding to the vertical line portion of the cross, and is therefore particularly susceptible to undesirable deformation such as creases.
[0077] In the napkin 1 of this embodiment, the rear high basis weight region 71 is located at the cross intersection where undesirable deformation of the cross-shaped adhesive-free region is particularly likely to occur, thereby effectively suppressing undesirable deformation in the region corresponding to the separation portion 35 of the main body M. This reduces the force acting on the wing adhesive portions 33 and hip guard adhesive portions 34, further preventing the wing adhesive portions 33 and hip guard adhesive portions 34 from peeling off.
[0078] In addition, in the absorbent body 4, the rear high basis weight region 71 is located near the center in the lateral direction Y, and on both sides of it are located the low rigidity low basis weight region 73 and the hip guard H, making it easier to deform the napkin 1 so as to wrap around the left and right bulges of the buttocks from the left and right directions.
[0079] [Example dimensions for adhesive part] The dimensions of each adhesive portion can be set as appropriate depending on the overall length of the napkin 1, but the numerical ranges described below are preferred for napkins with an overall length of 290 mm to 450 mm. In the napkin 1 of this embodiment, the maximum width of the pair of wings W and the maximum width of the pair of hip guards H are the same, and these correspond to the width of the napkin 1. Hereinafter, the length in the vertical direction X will be referred to as the "vertical width," and the length in the horizontal direction Y will be referred to as the "horizontal width."
[0080] The vertical width of the front adhesive portion 31 is preferably 150 mm to 210 mm, and the horizontal width is preferably 10 mm to 30 mm. The distance between the pair of front adhesive portions 31 in the horizontal direction Y is preferably 5 mm to 20 mm, and is 10 mm in the case of the napkin 1. The rear end 31a of the front adhesive portion 31, which determines the front position of the separation portion 35, is preferably located 30 mm to 125 mm rearward from the excretion point. The excretion point is the center of the length of the wing W in the vertical direction X. The vertical width of the front adhesive portion 31 located in the rear region M3 is preferably 10 mm to 85 mm, and is 40 mm in the case of the napkin 1, in order to ensure a good liquid absorption capacity and to position the separation portion 35 near the anus.
[0081] The distance in the vertical direction X between the rear end 31a of the front adhesive portion 31 and the front end 32a of the rear adhesive portion 32, i.e., the vertical width of the separation portion 35, is 25 mm or more and 35 mm or less, and is 30 mm in the case of the napkin 1, from the viewpoint of effectively reducing the force acting on the hip guard adhesive portion 34 due to the deformation of the napkin 1 that follows the deformation of the underwear during the wearer's movements.
[0082] The vertical width of the rear adhesive portion 32 is preferably 10 mm or more and 45 mm or less, and is 27 mm in the case of the napkin 1, and the horizontal width is preferably 10 mm or more and 30 mm or less, and is 20 mm in the case of the napkin 1. The distance between the pair of rear adhesive portions 32 in the horizontal direction Y is preferably 5 mm or more and 20 mm or less, and is 10 mm in the case of the napkin 1.
[0083] The vertical width of the vertical adhesive portions 330 constituting the wing adhesive portion 33 is preferably 30 mm to 50 mm, and the horizontal width is 2 mm to 10 mm. The spacing in the horizontal direction Y between adjacent vertical adhesive portions 330 is preferably 0.1 mm to 2 mm. The overall horizontal width of the wing adhesive portion 33 is preferably 12 mm to 25 mm.
[0084] The vertical width of each of the vertical adhesive portions 340 constituting the hip guard adhesive portion 34 is preferably 15 mm to 40 mm, and the horizontal width is preferably 2 mm to 10 mm. The spacing between adjacent vertical adhesive portions 340 in the horizontal direction Y is preferably 0.1 mm to 2 mm. The length of the entire hip guard adhesive portion 34 in the horizontal direction Y is preferably 12 mm to 25 mm. Note that, when the front and / or rear ends of the vertical adhesive portions 340 constituting the hip guard adhesive portion 34 are offset in the vertical direction X as shown in FIG. 2, the vertical width of the entire hip guard adhesive portion 34, i.e., the vertical length from the front end of the foremost vertical adhesive portion 340 to the rear end of the rearmost vertical adhesive portion 340, is preferably 17 mm to 50 mm, from the viewpoint of preventing sagging of the hip guard when the absorbent article is worn for a long period of time.
[0085] The distance in the longitudinal direction X between the rear end 32b of the rear adhesive portion 32 and the rear end 34b of the hip guard adhesive portion 34 is preferably 1 mm or more and 20 mm or less, and more preferably 5 mm or more and 15 mm or less. The position in the longitudinal direction X of the rear end 34b of the hip guard adhesive portion 34 is forward of the rear end 32b of the rear adhesive portion 32.
[0086] <Other embodiments>
[0087] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made within the scope of the gist of the present invention.
[0088] 10, the positional relationships of the front adhesive portion 31, rear adhesive portion 32, and hip guard adhesive portion 34 of the napkin of the above embodiment may be applied to a napkin 1H further including three-dimensional gathers G. That is, in the napkin 1H, the pair of front adhesive portions 31 and the pair of rear adhesive portions 32 may be spaced apart in the longitudinal direction X, and a spaced portion 35 where no adhesive portion is disposed may be provided between the pair of front adhesive portions 31 and the pair of rear adhesive portions 32, so that when an imaginary line parallel to the transverse direction Y passing through the front end of the hip guard adhesive portion 34H is drawn, the front end of the rear adhesive portion 32 is positioned on or behind the imaginary line. This makes it possible to obtain a napkin that is comfortable to wear, as in the above embodiment.
[0089] As shown in Fig. 10, the napkin 1H includes a main body M, a pair of wings W, a pair of hip guards H, and a pair of upright gathers G. In the napkin 1H, the hip guard adhesive portion 34H has a rectangular shape.
[0090] The three-dimensional gathers G are provided on the sides of the main body M in the horizontal direction Y, and are arranged in pairs on the left and right so as to extend in the vertical direction X. The three-dimensional gathers G stand up in the thickness direction Z while being worn, and have the function of preventing leakage of liquid in the horizontal direction Y. Note that "standing up in the thickness direction" means standing up toward the wearer.
[0091] The three-dimensional gathers G are arranged over the entire length of the main body M. The three-dimensional gathers G are configured so that at least a portion of them can stand up when contracted in the vertical direction X. The three-dimensional gathers G are formed by folding back the inner side in the horizontal direction Y of the side sheets 5 arranged on the sides of the main body M in the horizontal direction Y to the outer side in the horizontal direction Y. Note that the sheet member forming the three-dimensional gathers G is not limited to the side sheets 5, and may be a sheet member separate from the side sheets 5.
[0092] The three-dimensional gathers G have a standing region G1, a front fixing region G2, and a rear fixing region G3. The standing region G1 is configured to be able to stand in the thickness direction of the main body M. The standing region G1 is a portion of the folded-back portion of the side sheet 5 that is not joined to the main body M. The standing region G1 is disposed across the middle region M2 and extends to parts of the front region M1 and rear region M3. The front fastening region G2 and the rear fastening region G3 are non-standing portions. The front fastening region G2 and the rear fastening region G3 are located on the longitudinal edge sides of the front region M1 and the rear region M3, and are portions of the folded-back portion of the side sheet 5 that are joined to the main body M and are prevented from standing up in the thickness direction Z. In Figure 10, the front fastening region G2 and the rear fastening region G3 are indicated by dots.
[0093] The three-dimensional gathers G are formed by disposing elastic members 14 stretchable in the longitudinal direction X on a sheet member. The elastic members 14 are, for example, thread-like or strip-like elastic members, and a plurality of elastic members are provided in the napkin 1H. In the napkin 1H, the elastic members 14 are disposed throughout the three-dimensional gathers G in the standing region G1, the front fastening region G2, and the back fastening region G3, but it is sufficient that they are disposed at least in the standing region G1. The elastic members 14 are attached in a stretched state in the longitudinal direction X to the side sheet 5 stretched in the XY plane. As a result, when worn, contraction of the standing region G1 causes the main body M to curve in the longitudinal direction X, causing the standing region G1 to stand up from the main body M toward the skin. In the three-dimensional gathers G, the rear end G1a and front end G1b of the standing region G1 are portions where the stretching force of the gathers is particularly strong.
[0094] 10, in the napkin 1H, in a plan view, the front adhesive portion 31 and the rear adhesive portion 32 are located within the area sandwiched between a pair of three-dimensional gathers G, and the rear end G1a and the front end G1b of the standing region G1 do not overlap the adhesive portions in a plan view. In the napkin 1H, because the three-dimensional gathers G do not overlap the adhesive portions in a plan view, the areas of the napkin 1H corresponding to the three-dimensional gathers G are not fixed to the underwear when worn, and the standing region G1 is more likely to stand up from the main body M toward the skin.
[0095] In a napkin having three-dimensional gathers G, it is preferable to configure the rear end G1a, which is the part of the three-dimensional gathers G where the contractile force is particularly strong, so as not to overlap the adhesive portion in a plan view, to provide a separation portion 35 in the rear portion 80, and to configure the rear end G1a of the standing region G1 to be located within a region overlapping with the separation portion 35 of the main body M in the longitudinal direction X, or to be located inside this region in the longitudinal direction X. In the napkin 1H shown in Fig. 10, the rear end G1a is located within a region overlapping with the separation portion 35 of the main body M in the longitudinal direction X.
[0096] With the above configuration, the area of the napkin 1H corresponding to the separation portion 35 is not fixed to the underwear, making it easier for the contractile force of the upright gathers G to pull the absorbent body 4 closer, improving the ability of the standing region G1 to stand up. When worn, part of the standing region G1 overlaps the wearer's buttocks. With the above configuration, the napkin 1H can maintain a stable standing state of the standing region G1, and the upright gathers G can easily fill in any gaps that occur between the napkin and the wearer's body, improving the leakage prevention effect.
[0097] Furthermore, the absorbent article to which the present invention can be applied is not limited to sanitary napkins. Specifically, the present invention can be applied to pad-type absorbent articles similar to sanitary napkins, such as urine absorption pads and panty liners. [Explanation of symbols]
[0098] 1, 1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H...Absorbent articles 2...Surface sheet 3...Back sheet 3a…Underwear contact surface 4...Absorbent 11...Constricted part 21...First area 22…Second area 31…Front adhesive part 31a...rear end of front adhesive part 32…Rear adhesive part 32a...Front end of rear adhesive part 33...Wing adhesive part 34...Hip guard adhesive part 34a...Front end of hip guard adhesive part 35…Separation part 67...imaginary line 80…Rear part M…Main body M1...front area M2…middle area M3…rear area H...Hip guard W...Wing X: Vertical direction (front-to-back direction) Y...Horizontal (left and right) direction
Claims
1. An absorbent article comprising: a main body extending in a longitudinal direction corresponding to the front-to-rear direction of a wearer, divided into a front region, an intermediate region, and a rear region, the main body having a top sheet, a back sheet, and an absorbent disposed between the top sheet and the back sheet; a pair of wings extending laterally outward from the intermediate region of the main body corresponding to the left-to-right direction of the wearer; and a pair of hip guards extending laterally outward from the rear region of the main body, a front adhesive portion that extends continuously in the vertical direction and is disposed on the underwear contact surface of the main body, and a rear adhesive portion that is disposed behind the front adhesive portion with a separation portion where no adhesive portion is disposed therebetween; a wing adhesive portion disposed on the underwear contact surface of the wing; A hip guard adhesive portion disposed on the underwear contact surface of the hip guard; Equipped with The hip guard adhesive portion is a portion disposed inside the hip guard, Between the wing and the hip guard, both side edges along the vertical direction have narrowed portions narrowed laterally inward, When an imaginary line is drawn that is parallel to the lateral direction and passes through the front end of the hip guard adhesive portion, the front end of the rear adhesive portion is located on the imaginary line or rearward of the imaginary line, a rear portion of the absorbent article that overlaps the rear region in the longitudinal direction has a first region whose horizontal length increases from the front to the rear, and a second region that is located rearward of the first region and whose horizontal length decreases from a position where the horizontal length is maximum toward the rear, The separation portion overlaps the first region, and the front end of the hip guard adhesive portion is positioned rearward of the rear end of the front adhesive portion in the longitudinal direction. Absorbent articles.
2. An absorbent article according to claim 1, The front adhesive portion extends continuously in the vertical direction over a portion of the front region, the intermediate region, and a portion of the rear region. Absorbent articles.
3. An absorbent article according to claim 1 or 2, The rear adhesive portion extends continuously in the vertical direction toward the rear of the rear region. Absorbent articles.
4. The absorbent article according to claim 1 or 2, The front adhesive portion is located at a portion overlapping the constricted portion in the longitudinal direction. Absorbent articles.
5. The absorbent article according to claim 1 or 2, The hip guard adhesive portion is disposed from the first region to the second region. Absorbent articles.
6. The absorbent article according to claim 1 or 2, The longitudinal length of the rear adhesive portion is longer than the longitudinal length of the hip guard adhesive portion, and the longitudinal position of the rear end portion of the rear adhesive portion is rearward of the rear end portion of the hip guard adhesive portion. Absorbent articles.
7. The absorbent article according to claim 1 or 2, The top sheet and the absorbent body further include compressed grooves formed by integrally compressing the top sheet and the absorbent body, The compressed groove is present in the spaced portion in a plan view. Absorbent articles.
8. The absorbent article according to claim 1 or 2, The product is folded along a folding portion extending in the horizontal direction and then packaged in an exterior sheet, and the folding portion is not located in the spaced portion. Absorbent articles.
9. The absorbent article according to claim 1 or 2, The front edge of the hip guard adhesive portion is inclined with respect to the lateral direction. Absorbent articles.