TW202348213A - Absorbent article - Google Patents

Abstract

Provided is an absorbent article wherein: compressed grooves that are recessed from a top sheet side toward a back sheet side are formed in at least a top sheet and an absorbent body; the compressed grooves include a pair of central compressed grooves extending along the longitudinal direction and a pair of first rear compressed grooves which are rearward of the pair of the central compressed grooves and which are spaced apart at a prescribed distance in the longitudinal direction from the pair of the central compressed grooves; the prescribed distance in the longitudinal direction is greater than the distance in the lateral direction between the rear ends of the pair of the central compressed grooves and the distance in the lateral direction between the front ends of the pair of the first rear compressed grooves; and on the respective sides of the center line in the longitudinal direction, virtual lines that pass the rear ends of the pair of the central compressed grooves and the front ends of the pair of the first rear compressed grooves extend substantially parallel to the longitudinal direction.

Description

absorbent articles

The present invention relates to an absorbent article.

In absorbent articles such as sanitary napkins, it is known to have a long rear region of the main body to cope with use when spending a long time or sleeping at night.

In absorbent articles in which the rear region is long as described above, the compression grooves (embossing) formed by compressing from the top sheet side are often formed along the longitudinal direction from the area corresponding to the body fluid discharge port to the entire rear area. In a wide range, grooves are continuously formed when viewed in the longitudinal direction (for example, Patent Documents 1 and 2).

[Prior technical literature] (patent document) Patent Document 1: Japanese Patent Application Publication No. 2009-100846 Patent Document 2: Japanese Patent Application Publication No. 2014-223215

[Problem to be solved by the invention] However, with the previous configuration, when sleeping at night or using absorbent articles for a long time, body fluids may still flow down the groin due to the style of wearing, the movement of the wearer while wearing, etc. Worry about leakage to the back or back side of the groin. Therefore, it is sought to further improve the fit of the buttocks, especially the fit of the groin, to prevent downstream leakage.

According to one aspect of the present invention, it is possible to provide an absorbent article that improves the fit to the buttocks and prevents leakage along the flow.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, in each drawing, unless otherwise specified, the same or corresponding components may be assigned the same reference numerals and the description thereof may be omitted.

[First Embodiment] ＜Basic structure of absorbent articles＞ The absorbent article according to this embodiment may be a sanitary napkin, a diaper, a minor incontinence pad, etc. The basic structure of the absorbent article will be explained below by taking a sanitary napkin for nighttime or long-term use as an example. FIG. 1 shows a plan view of the absorbent article 1 according to the first embodiment. In addition, FIG. 2 shows a cross-sectional view along line I-I of FIG. 1 .

As shown in Figures 1 and 2, the absorbent article 1 has a liquid-permeable topsheet 3, which is disposed on the side facing the wearer's skin when worn, that is, the skin side; and, it is liquid-impermeable. The sexual back sheet 2 is arranged on the non-skin side (underpants side) opposite to the above-mentioned skin side. Furthermore, the absorber 4 is arranged between the back sheet 2 and the top sheet 3 . The back sheet 2, the absorbent body 4, and the top sheet 3 are laminated to form a main body (absorbent article main body) 8. The absorber 4 is arranged so as not to be exposed from the back sheet 2 and the top sheet 3 when viewed from above. Furthermore, the edge portion of the back sheet 2 and the edge portion of the top sheet 3 can be joined at both ends in the longitudinal direction D1 by adhesive, heat sealing, or the like.

As shown in the figure, the absorbent article 1 is in the shape of an elongated mat (the thickness is small compared to the width and length). In this specification, the longitudinal direction (front-back direction) of the absorbent article 1 is referred to as D1, and the transverse direction (left-right direction or width direction) orthogonal to the longitudinal direction D1 is referred to as D2. The longitudinal direction D1 is a direction corresponding to the front-rear direction of the wearer's body when wearing the absorbent article 1, and the transverse direction D2 is a direction corresponding to the left-right direction of the body.

In the form shown in FIGS. 1 and 2 , the main body 8 has a plan view shape that is substantially linearly symmetrical with respect to the center line (longitudinal direction center line) CL extending in the longitudinal direction D1 . However, the shape of the main body 8 is also different. It must be linearly symmetrical. In addition, the structure other than the shape of the absorbent article 1 and the main body 8 (including the thickness and density of the absorbent body 4, the size and position of the compression groove, the shape and size of the flap extending from the main body 8 in the transverse direction D2, etc. ), may be substantially symmetrical with the center line CL as the axis of symmetry, or may be asymmetrical.

The back sheet 2 may be a sheet having at least water-shielding properties, and may be a sheet made of an olefin resin such as polyethylene or polypropylene. Furthermore, a laminated nonwoven fabric in which a nonwoven fabric is laminated on a polyethylene sheet or the like, and a laminated sheet of nonwoven fabric in which substantial liquid impermeability is ensured by a waterproof film in between can be used. In addition, from the viewpoint of preventing stuffiness, it is further desirable to use a sheet having moisture permeability. As such a water-shielding and moisture-permeable sheet, an olefin-based resin such as polyethylene or polypropylene is melted and mixed with an inorganic filler, molded into a sheet, and then stretched in one or both axis directions. Microporous tablets, etc. The back sheet 2 may be a sheet having the same outer shape as that of the absorbent article 1 .

The top sheet 3 is a liquid-permeable sheet that quickly transmits body fluids such as menstrual blood, leucorrhea, and urine. As the top sheet 3, porous or non-porous non-woven fabrics or porous plastic sheets can be appropriately used. As raw material fibers constituting the nonwoven fabric, for example, the following materials can be used alone or in combination of two or more types: olefins such as polyethylene and polypropylene; synthetic fibers such as polyester and polyamide; rayon and cupro fibers Regenerated fibers such as; and blended fibers of these, as well as natural fibers such as cotton. In addition, examples of processing methods for nonwoven fabrics include hydroentanglement, spunbonding, thermal bonding, melt blowing, needle punching, and the like. Among these processing methods, the spunlace method is preferred because it can produce a soft nonwoven fabric, the spunbonding method can produce a highly drapeable nonwoven fabric, and the thermobonding method can produce a bulky and soft nonwoven fabric. is better from the point of view. In addition, composite fibers such as core-sheath fiber, side by side fiber, split fiber, etc., which have a fiber with a high melting point as the core and a fiber with a low melting point as the sheath, can also be used.

The absorbent body 4 is not limited as long as it is a material capable of absorbing and retaining body fluids, and preferably contains cotton pulp and a water-absorbent polymer. As the water-absorbent polymer, superabsorbent polymer granular powder (superabsorbent polymer (SAP)), superabsorbent polymer fiber (superabsorbent fiber (SAF)), and combinations thereof can be used. Examples of pulp include pulps composed of cellulose fibers such as chemical pulp obtained from wood and dissolving pulp, and artificial cellulose fibers such as rayon and acetate. As the raw material of chemical pulp, broad-leaved tree wood, coniferous tree wood, etc. can be used, but coniferous tree wood is suitable because of its long fiber length.

In addition, the absorbent body 4 may be mixed with synthetic fibers. As the synthetic fiber, a fiber obtained by mixing two or more of the following materials can be used, for example: polyolefin such as polyethylene or polypropylene; polyethylene terephthalate, polybutylene terephthalate Polyesters such as ester; polyamides such as nylon; and copolymers of these. In addition, composite fibers such as core-sheath type fibers, side-by-side fibers, split type fibers, etc., which have a fiber with a high melting point as a core and a fiber with a low melting point as a sheath, can also be used. In addition, it is also possible to surface-treat hydrophobic fibers using a hydrophilic agent to add affinity for body fluids to the fibers. It is preferable that the absorbent body 4 is manufactured by fiber laying or airlaid method.

The absorbent body 4 may not have a uniform basis weight over the entire surface, or may have a central region in the transverse direction D2 of the absorbent body, for example, in a range corresponding to the body fluid discharge port (blood discharge port) when worn. The part that increases the basis weight is the high basis weight part 4H. The high base weight part 4H can bulge towards the skin side. Therefore, the absorber 4 does not need to have a uniform thickness over the entire surface. The thickness of the absorber 4 (the length in the direction orthogonal to the longitudinal direction D1 and the transverse direction D2) may be 0.5 to 25 mm, preferably 1.5 to 15 mm.

The absorbent body 4 may also be wrapped with a covering sheet made of colored or uncolored (white) crepe paper or nonwoven fabric to prevent folding and breakage or spillage of polymer particles.

Side panels 7 and 7 along the longitudinal direction D1 are arranged on both sides of the absorbent article 1 , that is, on the side in the transverse direction D2 and on the skin side. The side panels 7 can be constructed using a material that has been subjected to appropriate water-repellent treatment or hydrophilic treatment in whole or in part to prevent the penetration of body fluids or to improve the skin feel. The side panels 7 are preferably made of natural fibers, synthetic fibers, regenerated fibers, etc., or are nonwoven fabrics composed of these fibers. When the side panels 7 are non-woven fabrics, they can be air-through non-woven fabrics, spunlace non-woven fabrics, spunbond non-woven fabrics, melt-blown non-woven fabrics, etc., which are less likely to add creases, are prone to wrinkles, are soft, and can improve the skin's touch. Best for hot air non-woven fabrics. In addition, the side panels 7 may be subjected to water-repellent treatment using a silicone-based, paraffin-based water-repellent agent, or the like.

The side panels 7 may be formed with a plurality of strip-shaped portions that are folded inward in the transverse direction D2 and extend along the side portions of the main body 8 . Furthermore, wrinkles may be formed by arranging an elastic stretchable member in an extended state between a plurality of layers along the longitudinal direction D1. Descriptions of the folding and pleating structures of the side panels 7 are omitted in this specification, and their illustration is also omitted in the drawings.

The absorbent article 1 may have a body fluid discharge opening facing area C, which faces the wearer's body fluid discharge opening (in the example shown in the figure, the vaginal opening) when worn, and a front area F, which is adjacent to the body fluid discharge opening and faces the body fluid discharge opening. The area in front of the area C and up to the front end of the absorbent article 1; the perineal facing area (middle area) M, which is adjacent to the rear of the body fluid discharge port facing area C and faces the vicinity of the wearer's perineum when worn ; and, the buttocks facing area B, which is adjacent to the rear of the perineum facing area M and is the area up to the rear end of the absorbent article 1, and faces the wearer's buttocks when worn. Furthermore, the buttocks opposing area B includes a front buttocks opposing area B1, which is adjacent to the perineal opposing area M; and a rear buttocks opposing area B2, which is adjacent to the rear of the front buttocks opposing area B1. The front buttocks facing area B1 is mainly the area facing the inguinal groove (the groove of the buttocks), that is, the area facing the part including the anus. The rear buttocks opposing area B2 can be at the rear of the inguinal groove or from near the rear end of the inguinal groove toward the rear. In particular, it can be directed to the boundary between the buttocks and the legs further back than the inguinal groove (when standing). is the area above). In addition, the description of the facing relationship between the area of the main body 8 and the wearer's body can be made within the general scope of the case where the wearer wears the absorbent article in a normal wearing pattern when lying down. Just a rough baseline.

The length of the body fluid discharge port in the longitudinal direction D1 of the area C may be 50 to 120 mm; the length of the buttocks in the longitudinal direction D1 of the area B may be 90 to 230 mm. Furthermore, according to the structure of this aspect, for example, the total length of the perineum-facing area M and the buttocks-facing area B is preferably the length of the buttocks-facing area B in the longitudinal direction D1, which is longer than the length of the long side where the flap WF is provided. The length in the direction D1 is longer than the rear absorbent article. In addition, the length of the longitudinal direction D1 of the front hip facing area (groove facing area) B1 may be 40 to 100 mm; and the length of the longitudinal direction D1 of the rear buttock facing area B2 may be 40 to 120 mm. Moreover, the total length of the absorbent article 1 in the longitudinal direction D1 may be 250 to 450 mm.

The absorbent article 1 may be provided with a pair of flaps WF, WF which extend outward in the transverse direction D2 from both sides of the body fluid discharge port facing area C respectively. On the non-skin side of the wings WF and WF, a migration prevention material (not shown) may be provided. When wearing, the flaps WF, WF can be folded back toward the non-skin side, and the deflection-preventing material can be attached to the underwear, so that the flaps WF, WF and the main body 8 can be used to clamp the underwear. Thereby, the absorbent article 1 is reliably fixed to the underwear. The flaps WF, WF are formed by joining the outward extending portions of the side panels 7 and 7 in the transverse direction D2 and the outward extending portions of the back sheet 2 in the transverse direction D2.

Furthermore, a pair of buttocks holding pieces HF and HF may be formed, which extend from the perineal facing area M toward the buttocks facing area B and extend outward in the transverse direction D2 from the side of the main body 8 . The buttocks retaining sheets HF and HF prevent the leakage of body fluids in the rear of the absorbent article 1 and expand the contact area with the buttocks, thereby making the entire absorbent article 1 less likely to deviate in the lateral direction D2 relative to the underwear, especially in the lateral direction D2. It also has the function of stabilizing the wearing position of the absorbent article 1 . The hip holding sheets HF, HF may be formed by joining the outward extending portions of the side panels 7 and 7 in the transverse direction D2 and the outward extending portion of the back sheet 2 in the transverse direction D2.

＜Compression groove＞ As shown in FIGS. 1 and 2 , the main body 8 of the absorbent article 1 of this form is formed with a plurality of compression grooves (embossing) (in the example of FIG. 1 , represented by symbols 10, 11, 12, and 13). ). The compression grooves may be formed to be linearly symmetrical with the longitudinal center line CL of the absorbent article 1 as the line of symmetry in plan view, but they do not necessarily have to be linearly symmetrical. The compression groove is formed as a groove recessed from the top sheet 3 side to the back sheet 2 side. The compression grooves can be formed, for example, by passing a laminated body composed of the top sheet 3 and the absorbent body 4 between a pair of pressure rollers. In this case, a roller having a convex portion corresponding to the compression groove on the surface can be arranged on the top sheet 3 side of the above-mentioned laminated body; a flat roller having no unevenness on the surface can be arranged on the absorbent body of the laminated body 4 sides; and clamped and pressed by two rollers. In addition, the compression groove may include a low compression portion and a high compression portion that is compressed at a higher pressure than in the low compression portion. In the figure, the high compression portion is shown in black.

In the form shown in FIG. 1 , the pair of central compression grooves 10 and 10 mainly extend from the body fluid discharge port facing area C to the perineal facing area M along the longitudinal direction D1. A pair of central compression grooves 10, 10 are formed on both sides of the longitudinal center line CL, being isolated from each other. The pair of central compression grooves 10, 10 are arranged so as not to overlap with the high basis weight portion 4H. The isolation distance between the pair of central compression grooves 10 and 10 in the transverse direction D2 may be constant or variable. For example, as shown in FIG. 1 , the area may be small near the boundary between the body fluid discharge port facing area C and the perineal facing area M, may be made large again behind it, and may become smaller toward the rear.

Furthermore, a pair of first rear compression grooves (a pair of rear compression grooves) 11 and 11 are formed behind the pair of central compression grooves 10 and 10 and are isolated from the pair of central compression grooves 10 and 10 . The pair of first rear compression grooves 11, 11 are formed in the buttocks facing area B1 and are preferably converged in the buttocks facing area B. In the example shown in the figure, the pair of first rear compression grooves 11, 11 are isolated from each other in the lateral direction D2.

A second rear compression groove 12 is formed behind the pair of first rear compression grooves 11, 11 and is isolated from the pair of first rear compression grooves 11, 11. The second rear compression groove 12 is a groove extending in the transverse direction D2 and has a shape that bulges rearward. In addition, a front compression groove 13 is formed in front of the pair of central compression grooves 10 and 10 . The front compression groove 13 has a closed shape formed by a combination of compression grooves with different curvature radii that protrude forward and are curved.

FIG. 3 shows an enlarged view of a portion from the rear portion of the pair of central compression grooves 10 and 10 to the second rear compression groove 12 . As shown in Figure 3, the rear ends 10bt, 10bt of a pair of central compression grooves 10, 10 are isolated from each other. In addition, the front ends 11ft and 11ft of the pair of first rear compression grooves 11 and 11 are also isolated from each other. Furthermore, the rear end 10bt of the central compression groove 10 and the front end 11 ft of the first rear compression groove 11 are aligned in the longitudinal direction D1 on each side of the longitudinal center line. More specifically, on the left side of the longitudinal center line CL, a line passing through the rear end 10bt of the left groove among the pair of central compression grooves 10 and the left groove among the pair of first rear compression grooves 11 is drawn. In the case of the imaginary line X1 at the front end 11 ft, the imaginary line X1 is configured to be substantially parallel to the longitudinal direction. Further, on the right side of the longitudinal center line CL, a line is drawn that passes through the rear end 10bt of the right groove among the pair of central compression grooves 10 and the front end 11ft of the right groove among the pair of first rear compression grooves 11. In the case of the virtual line X1', the virtual line X1' is substantially parallel to the longitudinal direction. In addition, in this specification, a direction substantially parallel to a predetermined direction is not only completely parallel to the predetermined direction, but also includes an extending direction in which the angle between the predetermined direction and the predetermined direction is preferably ±10∘, and more preferably ±5∘.

When the absorbent article 1 is worn, the body fluid discharge port facing area C and the perineal facing area M are affected by the force from the outer leg in the transverse direction D2, so the inguinal groove facing area B1 is also affected by the force from the outer leg in the transverse direction D2. The force exerted by the outside of the transverse direction D2 toward the longitudinal center line CL. Furthermore, when wearing, the wearer himself pushes the main body 8 of the absorbent article 1 from both sides, so that the center of the groin-facing area B1 in the transverse direction D2 may deform along the groin. When such force P, P (Fig. 3) is received from the outside in the transverse direction D2, the portion between the central compression grooves 10 and 10 of the pair of isolated pairs bulges toward the skin side, and the third of the pair of isolated central compression grooves 10 bulges toward the skin. A rear compression groove 11, the part between 11 also bulges toward the skin side. Here, the pair of central compression grooves 10, 10 and the pair of first rear compression grooves 11, 11 are isolated in the longitudinal direction D1, and as mentioned above, the rear ends 10bt of the pair of central compression grooves 10, 10, 10bt is aligned with the front ends 11ft and 11ft of the pair of first rear compression grooves 11 and 11 in the longitudinal direction D1 on each side of the longitudinal center line CL, so the pair of central compression grooves 10 and 10 The movement has continuity in the longitudinal direction with the movement of the pair of first rear compression grooves 11,11. That is, the bulge between the pair of central compression grooves 10, 10 and the bulge between the pair of first rear compression grooves 11, 11 are linked in the longitudinal direction D1, and the bulge between the pair of central compression grooves 10, 10, A bulge toward the skin side is formed in the area between 10 and the pair of first rear compression grooves 11 and 11 .

In this form, as shown in FIG. 3 , the distance L in the longitudinal direction D1 between the pair of central compression grooves 10 , 10 and the pair of first rear compression grooves 11 , 11 is smaller than the distance L between the pair of central compression grooves 10 . , the distance d 10 in the lateral direction D2 between the rear ends 10bt, 10bt of _{10 is larger, and is also larger than the distance d 11} in the lateral direction D2 between the front ends 11ft, 11ft of the pair of first rear compression grooves 11 _{, 11} (L ＞d ₁₀ , and L＞d ₁₁ ). Therefore, the above-mentioned ridge becomes a mountain with a certain length along the longitudinal direction D1 and a relatively narrow width in the transverse direction D2. In other words, a line can be formed and obtained using a total of four places as base points: the rear ends 10bt, 10bt of the pair of central compression grooves 10, 10 and the front ends 11ft, 11ft of the pair of first rear compression grooves 11, 11. A mountain that extends in the long direction D1 and bulges toward the skin. In FIG. 3 , a mountain-forming region 20 that becomes a mountain due to swelling when worn is shown with cross hatching.

Here, the effects produced by the above-mentioned configuration of the central compression grooves 10 and 10 and the first rear compression grooves 11 and 11 will be described with reference to FIG. 4 . In FIG. 4 , a schematic cross-section (a cross-section along line II-II in FIG. 3 ) taken between a pair of central compression grooves 10, 10 and a pair of first rear compression grooves 11, 11 is shown. Den represents the wearer's hips together. If the groin-facing area B1 of the absorbent article 1 is pushed from the outside in the transverse direction D2 toward the center (in the direction of arrows P and P in Fig. 3 ), as shown in Fig. 4(a) , in Fig. 3 The mountain formation area 20 in the middle rises to become a narrow mountain Mt. Furthermore, when wearing, as shown in Figure 4(b), the absorptive properties can be made so that the mountain Mt enters the parting line (groove) of the buttocks Den and the areas on both sides of the mountain Mt follow the surface of the buttocks. Article 1 adheres closely to the body and obtains high fit. In addition, even if the wearer moves the body, for example, even if he turns over while sleeping, the once tightly sealed shank Mt can be easily maintained in the buttocks groove. Thereby, the body fluid flowing backward from the body fluid discharge port can be more reliably received and absorbed. In this way, it is possible to prevent the so-called downstream leakage of body fluids from flowing along the groin to the back or to the rear side.

In addition, for absorbent articles with a long rear region including a region that can face the buttocks from the groin to the rear of the groin, many wearers will use the main body 8 of the absorbent article 1 in advance. Wear it after deforming so that the center of D2 in the transverse direction enters the groin. This form is suitable for use in which the main body 8 is deformed and tightly adhered when worn, and can improve the adhesion in the buttocks of the absorbent article 1 .

Further, as shown in Figure 3, the pair of central compression grooves 10, 10 is isolated from the pair of first rear compression grooves 11, 11. Therefore, for the pair of central compression grooves 10, 10 and the pair of first rear compression grooves, The area between the compression grooves 11, 11 can maintain its flexibility, and this area can be flexibly deformed according to the situation. Therefore, the above-mentioned mountain formed between the pair of central compression grooves 10, 10 and the pair of first rear compression grooves 11, 11 can be made flexible according to the shape of the wearer's body and the style of wearing it. Deformation. For example, the mountain can be easily curved in the longitudinal direction D1 along the curvature of the body in the front-rear direction, and the degree of curvature can also be easily changed. Furthermore, even if a force is applied that bends the mountain part, it can deform in accordance with the bending, so it can maintain a state of close contact with the body. In addition, it is preferable that no compression grooves or compression grooves formed by compressing the top sheet 3 and the absorber 4 are formed between the pair of central compression grooves 10, 10 and the pair of first rear compression grooves 11, 11. department.

The distance d ₁₀ between the rear ends 10 bt and 10 bt of the pair of central compression grooves 10 and 10 in the transverse direction D2 may be preferably 5 to 30 mm, more preferably 10 to 20 mm. The distance d ₁₁ between the front ends 11 ft and 11 ft of the pair of first rear compression grooves 11 and 11 in the transverse direction D2 may be preferably 5 to 30 mm, more preferably 10 to 20 mm. Moreover, the distance d ₁₀ may be preferably 5 to 30%, more preferably 10 to 25% with respect to the length of the absorber in the transverse direction D2 (the width of the absorber). The distance d ₁₁ may be preferably 5 to 30%, more preferably 10 to 25%, relative to the length of the absorber in the transverse direction D2 (the width of the absorber). By setting the width of the formed mountain by setting the distance d ₁₀ and the distance d ₁₁ to the above range, the mountain can be formed using a normal usage method and the groove can be entered.

Furthermore, the distance L in the longitudinal direction D1 between the pair of central compression grooves 10, 10 and the pair of first rear compression grooves 11, 11 may be preferably 10 to 60 mm, more preferably 20 to 40 mm. By setting the distance L to the above range, a mountain with an appropriate length in the longitudinal direction D1 can be formed that is suitable for the length of the groin in the front-rear direction.

When the configuration of the compression grooves is linearly symmetrical with the longitudinal centerline CL as the axis of symmetry, the distance d ₁₀ in the transverse direction D2 between the rear ends 10bt, 10bt of the pair of central compression grooves 10, 10 is the same as The distance d 11 in the transverse direction D2 between the front ends 11 ft and 11 ft of the first rear compression grooves 11 and ₁₁ may be equal or different, and the value of the ratio of one to the other (d ₁₀ /d ₁₁ or d ₁₁ / d ₁₀ ), preferably from 0.8 to 1.2, more preferably from about 0.9 to 1.1. Furthermore, it is preferable that the distance d 11 in the lateral direction D2 between the front ends 11 ft and 11 ft of the pair of first rear compression grooves 11 and ₁₁ is the same as the lateral distance d 11 between the rear ends 10 bt and 10 bt of the pair of central compression grooves 10 and 10 . The distance d ₁₀ in direction D2 is the same or smaller than this distance d ₁₀ . In the latter case, the width of the mountain formed in the area between the pair of central compression grooves 10, 10 and the pair of first rear compression grooves 11, 11 becomes smaller toward the rear. This makes it possible to adapt to the shape of the groin, which gradually becomes shallower toward the rear.

Moreover, as shown in FIG. 3 , it is preferable that the groove width of the pair of first rear compression grooves 11, 11 is larger than the groove width of the pair of center compression grooves 10, 10. The force received from both legs becomes smaller toward the back, making it less likely to cause deformation when wearing. Therefore, by setting the groove width of the first rear compression grooves 11 and 11 located behind the central compression grooves 10 and 10 to be larger in advance, the function of the first rear compression grooves 11 and 11 as a base point for bending can be improved. , and it is easy to form the above-mentioned mountains.

As shown in Figure 3, the pair of central compression grooves 10, 10 can be inclined at the rear, and the pair of first rear compression grooves 11, 11 can be inclined at the front, thereby making the pair of central compression grooves 10, The rear end portion of 10 and the front end portions of the pair of first rear compression grooves 11, 11, a total of four portions, are individually inclined toward the longitudinal center line and arranged in a radial shape. More specifically, the pair of central compression grooves 10 and 10 are inclined toward the longitudinal center line CL on the rear end side. That is, the pair of central compression grooves 10 and 10 may include inclined portions (inclined rear end portions) 10b and 10b including rear ends and inclined closer to the longitudinal center line CL toward the rear. The inclined portions 10b, 10b may be linear or curved. The inclination angle α of the inclined portion 10b is preferably greater than 0∘ and less than 60∘ with respect to the longitudinal center line CL, and more preferably is 10 to 40∘. In addition, the inclination angle of the inclined portion of the compression groove may be the angle between the center line of the compression groove and the longitudinal center line CL, and may be the tangent line between the center line of the compression groove at the front end of the compression groove and the longitudinal center line. The angle between line CL. Furthermore, the pair of first rear compression grooves 11, 11 are inclined toward the longitudinal center line CL on the front end side. That is, the pair of first rear compression grooves 11, 11 may include inclined portions (inclined front end portions) 11f, 11f including front ends and inclined closer to the longitudinal center line CL toward the front. In the example shown in FIG. 3 , the entire pair of first rear compression grooves 11 and 11 individually form inclined portions that are inclined toward the longitudinal center line CL. The inclination angle β of the first rear compression grooves 11, 11 (or the inclined front end portion included in the first rear compression grooves 11, 11) may be relative to the longitudinal centerline CL, and is preferably greater than 0∘ and within 60∘ or less, preferably 10 to 40∘.

In the above configuration, when a bending or twisting force is applied to the absorbent article 1, for example, the inclined portion 10b of the central compression groove 10 on one side (for example, the left side) of the longitudinal center line CL is different from the inclined portion 10b on the other side (for example, the left side) of the longitudinal center line CL. For example, the inclined portion 11f of the first rear compression groove 11 on the right side becomes easy to link, so that the force can easily escape in the direction where the two are connected. Therefore, even if a bending force is applied to the absorbent article, the mountains formed between the pair of central compression grooves 10, 10 and the pair of first rear compression grooves 11, 11 are not likely to be compressed due to unnecessary stress. Collapse. The fit of the inguinal groove facing area B1 to the inguinal groove can be maintained.

Furthermore, the inclination angle α of the inclined portions 10b, 10b of the central compression grooves 10, 10 is different from the inclination angle β of the first rear compression grooves 11, 11 (or the inclined front end portion included in the first rear compression grooves 11, 11). , may be the same or different, and the difference (α-β or β-α) between the inclination angle α and the inclination angle β is preferably 10∘ or less, more preferably 5∘ or less. That is, it is preferable that the extending direction of the rear end side portion of the central compression grooves 10 and 10 is the same as or similar to the extending direction of the front end portion of the first rear compression grooves 11 and 11 . This can improve the effect of making the mountain formed in the area between the pair of central compression grooves 10, 10 and the pair of first rear compression grooves 11, 11 less likely to be crushed.

<Modification example of the first embodiment> FIG. 5 shows a modified example of the first embodiment. The example shown in FIG. 5 has the same structure as the example shown in FIG. 1 except that the shapes of the pair of first rear compression grooves 11 and 11 are different. In addition, the example shown in FIG. 5 also exhibits the same effect as the example shown in FIG. 1 . Furthermore, in the example shown in FIG. 5 , the pair of first rear compression grooves 11 , 11 are connected to each other rearward, and are formed into a U-shape or a horseshoe shape in which the entirety is convex rearward. The pair of first rear compression grooves 11, 11 are connected at the rear, whereby the body fluids that spread toward the rear can be blocked by the compression grooves. Furthermore, the main body 8 becomes easy to bend in the longitudinal direction D1 at the connecting portion of the pair of first rear compression grooves 11, 11, so it is easy to bend the main body 8 in accordance with the front-rear direction of the body.

FIG. 6 shows another modification example of the first embodiment. In the example shown in FIG. 6 , the basic structure of the absorbent article is the same as that of the example shown in FIG. 1 , but the shapes of the pair of central compression grooves 10 , 10 and the pair of first rear compression grooves 11 , 11 are different. example of. More specifically, the pair of central compression grooves 10 and 10 are respectively substantially parallel to the longitudinal direction D1 in the rear, and the pair of first rear compression grooves 11 and 11 are also substantially parallel to the longitudinal direction D1 in the front. In this example, the distance in the longitudinal direction of the pair of central compression grooves 10, 10 and the pair of first rear compression grooves 11, 11 is also greater than the lateral distance 10bt, 10bt of the rear ends 10bt, 10bt of the pair of central compression grooves 10, 10. The distance in the direction D2, and the distance in the lateral direction D2 between the front ends 11ft, 11ft of the pair of first rear compression grooves 11, 11 are larger; and the rear ends 10bt of the pair of central compression grooves 10 and the pair of first rear The front ends 11 ft of the compression grooves 11 are aligned in the longitudinal direction D1 on each side of the longitudinal center line CL. Therefore, similarly to the example shown in FIG. In the area between the first rear compression grooves 11, 11, a mountain with a narrow width along the longitudinal direction D1 can be formed (Fig. 4). Therefore, the buttocks-facing region B can be deformed in a manner suitable for the groin, thereby preventing downstream leakage of body fluids and the like.

[Second Embodiment] FIG. 7 is a plan view of the absorbent article 1A according to the second embodiment of the present invention as viewed from the skin side. Moreover, FIG. 8 shows a cross-sectional view along line III-III of FIG. 7 . The absorbent article 1A according to the second embodiment also has the same basic structure as the first embodiment (Figs. 1 to 6), but is different from the first embodiment in the shape of the compression groove in the groin opposing region B1. That is, the side compression grooves 11S, 11S are respectively formed on both sides of the pair of first rear compression grooves 11, 11. In the absorbent article 1A according to the second embodiment, the same effects as those of the first embodiment can be obtained, but in this embodiment, further effects can be obtained by the side compression grooves 11S, 11S.

FIG. 9 shows an enlarged view of the portion from the pair of central compression grooves 10 , 10 toward the second rear compression groove 12 in FIG. 7 . As shown in FIG. 9 , the side compression groove 11S branches from the first rear compression groove 11 and extends along the transverse direction D2, and further extends forward along the longitudinal direction D1. In other words, the rear end portions of the side compression grooves 11S and 11S are individually bent toward the first rear compression groove 11 and connected to the first rear compression groove 11 . The lateral compression groove 11S is formed so as to form a compression groove protruding rearward by the first rear compression groove 11 and the lateral compression groove 11S. Furthermore, the rigidity of the regions 30 and 30 (hatched lines in FIG. 9 ) surrounded by the first rear compression groove 11 and the side compression groove 11S can be made slightly higher, so that folding or the like in this region can be prevented. In addition, from the viewpoint of ensuring that the above-mentioned regions 30, 30 have a certain area, the isolation distance in the lateral direction D2 between the lateral compression grooves 11S, 11S (the lateral distance between the lateral compression grooves 11S, 11S at the most separated positions) The isolation distance in the direction D2) is within the range of the longitudinal direction D1 between the central compression groove 10,10 and the first rear compression groove 11,11, and is preferably the rear end 10bt of the central compression groove 10,10, The distance d 10 in the lateral direction D2 of _{10 bt} or the distance d 11 in the lateral direction D2 of the rear ends 11 ft and 11 ft of the first rear compression grooves 11 and ₁₁ is 2.5 to 4.5 times, and more preferably 3 to 4 times.

As shown in FIG. 9 , the regions 30 , 30 individually surrounded by the first rear compression grooves 11 , 11 and the side compression grooves 11S, 11S are formed in the mountain formation region 20 along the longitudinal direction D1 (in FIG. 9 The mountain formation area 20 is formed between the pair of central compression grooves 10, 10 and the pair of first rear compression grooves 11, 11 on the outside of the cross-hatch line in the transverse direction D2.

In FIG. 10 , a schematic cross-section (a cross-section along line IV-IV in FIG. 9 ) taken between a pair of central compression grooves 10, 10 and a pair of first rear compression grooves 11, 11 is shown. Den represents the wearer's hips together. FIG. 10 is a diagram corresponding to FIG. 4 , but shows the positions of the side compression grooves 11S, 11S in the second embodiment. As shown in FIG. 10 , the regions 30 and 30 are regions that come into contact with the shallower position of the groin or the buttock surfaces on both sides of the groin when the absorbent article 1 is worn. Therefore, the areas 30 and 30 can also contact the surfaces on both sides of the groin along the roundness of the groin. This improves the fit on both sides of the groin, so even if the body fluids flowing down the groin are transferred to the outside in the transverse direction D2, leakage can be prevented.

It is preferable that the front ends 11St, 11St of the side compression grooves 11S, 11S are located further forward than the front ends 11ft, 11ft of the first rear compression grooves 11, 11. Thereby, the compression groove can be extended outside the area between the central compression grooves 10, 10 and the first rear compression grooves 11, 11 in the transverse direction D2, thereby preventing body fluids from leaking outward in the transverse direction D2.

In addition, in order to further improve the rigidity of the above-mentioned regions 30 and 30 in preventing folding and the like, it is also possible to insulate the absorber 4 in the region 30 surrounded by the first rear compression groove 11 and the side compression groove 11S in a dot shape. way to form a plurality of compression grooves. The form (shape, size, formation method) of the compressed portion formed on the absorber 4 is not particularly limited as long as it can prevent folding of the regions 30, 30, etc. and also ensure flexibility along the surface of the buttocks.

The side compression groove 11S may be connected to the first rear compression groove 11 or may not be connected. From the viewpoint of increasing the rigidity of the region 30 surrounded by the first rear compression groove 11 and the side compression groove 11S to prevent folding, and from the viewpoint of preventing rearward leakage of body fluids, the configuration shown in FIGS. 7 and 9 is preferred. As shown in the figure, the side compression groove 11S is connected to the first rear compression groove 11.

On the other hand, from the viewpoint of improving the flexibility of the groin opposing region B1, as shown in FIG. 11 , the lateral compression groove 11S may be configured not to be connected to the first rear compression groove 11 . At this time, the side compression groove 11S may be separated from the first rear compression groove 11 by, for example, an interval of 10 mm or less, preferably 5 mm or less in the lateral direction D2.

As mentioned above, the present invention has been described based on the embodiments. However, the present invention is not limited to these embodiments. In addition, various changes, modifications, substitutions, additions, deletions, combinations, etc. can be made to the above-described embodiment within the scope described in the patent application, and these also belong to the technical scope of the present invention.

Furthermore, specific aspects of the present invention will be described below.

(Note 1) Regarding the aspect of Appendix 1, it is an absorbent article having an elongated main body, and the main body is provided with a top sheet on the skin side, a back sheet on the side opposite to the skin side, and the top sheet and the back sheet are disposed between the top sheet and the back sheet. The absorbent body between them; at least the top sheet and the absorbent body are formed with compression grooves that are recessed from the top sheet side to the back sheet side; the compression grooves include a pair of central compression grooves along the longitudinal direction. Extend; and, a pair of rear compression grooves, which are separated from the pair of central compression grooves by a prescribed longitudinal interval behind the aforementioned pair of central compression grooves; the aforementioned prescribed longitudinal interval is greater than the aforementioned The lateral distance between the rear ends of the pair of central compression grooves and the lateral distance between the front ends of the pair of rear compression grooves are larger; and the distance between the rear ends of the pair of central compression grooves and the front ends of the pair of rear compression grooves is greater. The imaginary line at the front end extends substantially parallel to the longitudinal direction on each side of the longitudinal center line.

In the aspect of the above appendix 1, when pressure is applied from both sides of the main body, the portion between the rear ends of the pair of central compression grooves and the pair of rear compression grooves (the third of the pair to be described later) The part between the front ends of a posterior compression groove tends to bulge toward the skin. Here, the rear end of the central compression groove and the front end of the rear compression groove are arranged so that an imaginary line passing through them is substantially parallel to the longitudinal direction on each side of the longitudinal centerline. Therefore, the pair of central compression grooves In conjunction with the bulge between the front ends of the rear compression grooves, a bulge along the longitudinal direction can be formed in the area between a pair of central compression grooves and a pair of rear compression grooves. Furthermore, the distance between the pair of central compression grooves and the pair of rear compression grooves is larger than the lateral distance between the rear ends of the pair of central compression grooves, and is also larger than the lateral distance between the front ends of the pair of rear compression grooves. Since the distance is larger, it is possible to form a mountain that has a certain length along the longitudinal direction and a relatively narrow width in the lateral direction. That is, a total of four places (two places in the front and two places in the rear) as base points along the longitudinal direction can be formed with the rear ends of the pair of central compression grooves and the front ends of the pair of rear compression grooves. D1 extends the mountain. Furthermore, when the absorbent article is worn, the mountain can be made to enter the deep part of the crotch groove, so the absorbent article can be closely adhered along the crotch groove. In addition, even if the wearer moves the body, the formed mountains are not easily separated from the hip groove and can be maintained close to each other. Therefore, it is possible to prevent body fluids from flowing backward from the body fluid discharge port and leaking out (hereinafter also referred to as "downward leaking").

Furthermore, the rear ends of the pair of central compression grooves are isolated from the front ends of the pair of rear compression grooves, so the area between the pair of center compression grooves and the pair of rear compression grooves can be made soft and corresponding. Flexible deformation depending on the situation. Therefore, the mountains formed between the pair of central compression grooves and the pair of rear compression grooves can be flexibly deformed in accordance with the shape of the wearer's body and the wearing style.

(Note 2) In the aspect of Appendix 2, the pair of central compression grooves includes an inclined portion including a rear end and is inclined closer to the longitudinal centerline toward the rear; and the pair of rear compression grooves includes An inclined portion including a front end that is inclined closer to the longitudinal centerline toward the front.

According to the aspect of Appendix 2 above, the distance between the rear end parts of the pair of central compression grooves is narrower than the other parts, and the distance between the front parts of the pair of rear compression grooves is narrower than the other parts, so it is formed in the center of the pair The mountain in the area between the compression groove and the pair of rear compression grooves can be formed to be narrower in width than the other portions of the compression groove. This can form a mountain with a shape that is more suitable for entering the crotch groove.

(Note 3) In the aspect of Appendix 3, the difference between the inclination angle of the rear end portion of the central compression groove with respect to the longitudinal centerline and the inclination angle of the front end portion of the rear compression groove with respect to the longitudinal centerline is 10∘ the following.

Regarding the aspect of Appendix 3 above, the inclination of the rear end portion of the central compression groove is the same as or similar to the inclination of the front end portion of the rear compression groove, so that even when a bending or twisting force is applied to the absorbent article, It also makes it easier for force to escape in the direction where the central compression groove on one side of the longitudinal centerline is connected to the rear compression groove on the other side, so it is possible to reduce unnecessary stress that forms in a pair of central compression grooves. With a pair of rear compression trenches between the hills there is the possibility of being crushed. Even when the wearer moves the legs greatly, the area facing the groin can be deformed following the wearer's body.

(Note 4) In the aspect of Appendix 4, the pair of rear compression grooves are connected rearward.

According to the aspect of the above-mentioned appendix 4, the body fluid that diffuses rearward between the rear compression grooves can be blocked behind the rear compression grooves, thereby improving the effect of preventing leakage.

(Note 5) In the aspect of Appendix 5, the lateral distance between the front ends of the pair of rear compression grooves is the same as or smaller than the lateral distance between the rear ends of the pair of central compression grooves.

According to the aspect of Appendix 5, the lateral length (width) of the mountains formed in the area between the pair of central compression grooves and the pair of rear compression grooves can be made the same in the longitudinal direction, or It gets smaller as you go to the back. The crotch groove gradually becomes shallower toward the rear, so according to the composition of this form, the above-mentioned mountain can be made into a shape that can easily follow the crotch groove.

(Note 6) In the aspect of Supplementary Note 6, the compression grooves are individually located on the lateral outer side of the pair of rear compression grooves, and further include lateral compression grooves extending in the longitudinal direction; rear end portions of the lateral compression grooves , individually bent toward the aforementioned posterior compression groove.

According to the aspect of Appendix 6, the rigidity of the area between the rear compression groove and the side compression groove formed laterally outside the rear compression groove is set to be slightly higher. Thereby, unnecessary wrinkles and folds can be avoided in the portion between the rear compression groove and the lateral compression groove, and this portion can be made to follow the surface of the buttocks on both sides of the femoral groove. Even on both sides of the buttocks, absorbent articles can be made more closely connected to improve the effect of preventing leakage.

This application claims priority based on Japanese Patent Application No. 2022-088306 filed on May 31, 2022, the entire content of which is incorporated herein by reference.

1, 1A: Absorbent article (sanitary napkin) 2: Back sheet 3: Top sheet 4: Absorbent body 4H: High basis weight part 7: Side panels 8: Main body (absorbent article main body) 10: Central compression groove 10b : The inclined part of the central compression groove (the inclined rear end part) 10bt: The rear end of the central compression groove 11: The first rear compression groove 11f: The inclined part of the first rear compression groove (the inclined front end part) 11ft: The first rear compression groove Front end 11S: Side compression groove 11St: Front end of side compression groove 12: Second rear compression groove 13: Front compression groove 20: Mountain formation area 30: Area C: Body fluid discharge port facing area CL: Long side center _{Lines X1} , Mountain B: Hip opposing area B1: Front hip opposing area (groove opposing area) B2: Rear hip opposing area WF: Wings

Fig. 1 is a plan view of the absorbent article according to the first embodiment of the present invention as viewed from the skin side. FIG. 2 is a cross-sectional view along line I-I of FIG. 1 . FIG. 3 is a partial enlarged view of FIG. 1 . FIG. 4 is a schematic diagram for explaining the function of the compression groove. FIG. 5 is a diagram showing a modified example of the first embodiment. FIG. 6 is a diagram showing another modification example of the first embodiment. Fig. 7 is a plan view of the absorbent article according to the second embodiment of the present invention as viewed from the skin side. FIG. 8 is a cross-sectional view taken along line III-III of FIG. 7 . FIG. 9 is a partial enlarged view of FIG. 7 . FIG. 10 is a schematic diagram for explaining the function of the compression groove. FIG. 11 is a diagram showing a modified example of the second embodiment.

Domestic storage information (please note in order of storage institution, date and number) without

Overseas storage information (please note in order of storage country, institution, date, and number) without

1: Absorbent articles (sanitary napkins)

3: Top film

4:Absorbent body

4H: High basis weight department

7: Side piece

8: Body (absorbent article body)

10: Central compression groove

10b: The inclined part of the central compression groove (the inclined rear end part)

11: First rear compression groove

11f: The inclined part of the first rear compression groove (the inclined front end part)

12: Second rear compression groove

13: Front compression groove

C: Area opposite the body fluid discharge port

CL: Long side center line

D1: Long side direction

D2: Horizontal direction

F: forward area

HF: Hip retaining piece

M: Middle area (area opposite the perineum)

B: Hip area

B1: The area opposite the front hip (the area opposite the groin)

B2: Rear hip area

WF: wings

Claims (6)

An absorbent article having an elongated body, the body having a top sheet on the skin side, a back sheet on the side opposite to the skin side, and an absorbent body arranged between the top sheet and the back sheet; At least the top sheet and the absorbent body are formed with a compression groove that is recessed from the top sheet side to the back sheet side; The aforementioned compression grooves include a pair of central compression grooves extending along the longitudinal direction; and a pair of rear compression grooves located behind the pair of central compression grooves at a predetermined distance in the longitudinal direction. A pair of central compression grooves isolate; The aforementioned prescribed longitudinal distance is greater than the lateral distance between the rear ends of the pair of central compression grooves and the lateral distance between the front ends of the pair of rear compression grooves; and An imaginary line passing through the rear ends of the pair of central compression grooves and the front ends of the pair of rear compression grooves extends substantially parallel to the longitudinal direction on each side of the longitudinal centerline. The absorbent article according to claim 1, wherein the pair of central compression grooves includes an inclined portion including a rear end and is inclined closer to the longitudinal centerline toward the rear; and, The rear compression groove includes an inclined portion including a front end that is inclined closer to the longitudinal centerline toward the front. The absorbent article according to claim 1 or 2, wherein the inclination angle of the rear end portion of the central compression groove with respect to the longitudinal centerline is equal to the inclination angle of the front end portion of the rear compression groove with respect to the longitudinal centerline. The difference in tilt angle is 10∘ or less. The absorbent article according to claim 1 or 2, wherein the pair of rear compression grooves are connected at the rear. The absorbent article according to claim 1 or 2, wherein the lateral distance between the front ends of the pair of rear compression grooves is the same as or greater than the lateral distance between the rear ends of the pair of central compression grooves. Directional separation is smaller. The absorbent article according to claim 1 or 2, wherein the compression grooves are individually located outside the pair of rear compression grooves in the lateral direction and further include lateral compression grooves extending along the longitudinal direction; The rear end portions of the side compression grooves are individually curved toward the rear compression grooves.