JP4925632B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article that has a three-dimensional structure and can be deformed according to the shape of the body.

  Conventionally, absorbent articles have been used as feminine sanitary products that absorb and retain menstrual blood excreted from female genitals. The absorbent article generally has a vertically long shape having a liquid-permeable surface material, a liquid-impermeable back material, and an absorber provided between the surface material and the back material. When worn, the surface material side of the absorbent article is in contact with the user's skin surface, and the back material side is in contact with the surface of the underwear worn by the user.

  By the way, in order to prevent the leakage of menstrual blood, the absorbent article must be brought into contact with no gap in accordance with the shape of the vaginal opening and the curved groove of the buttocks. Under the circumstances as described above, various absorbent articles have been proposed.

  For example, the absorbent article described in Patent Document 1 is a liquid-permeable surface material, and a vertically long upper layer portion comprising a liquid-retaining absorbent material, and a lower layer portion comprising a liquid-impermeable back sheet, The upper layer portion is connected to the lower layer portion through elastic members from both ends in the longitudinal direction. Patent Document 2 also proposes a sanitary napkin as an absorbent article having a configuration equivalent to that of Patent Document 1. According to these proposed absorbent articles, the upper layer portion and the user's skin can be brought into contact with the user's movement by the contraction stress of the elastic member provided at both ends of the upper layer portion.

  The sanitary napkin as an absorbent article described in Patent Document 3 has a belt-like main body having a liquid-impermeable back material and an absorbent body, and a solid part fixed to one side surface of the main body along the longitudinal direction. Has been. The three-dimensional portion has a substantially triangular cross section along the width direction of the main body, and an elastic absorber is provided inside. According to this absorbent article, the solid portion can be brought into contact with the contour of the user's body by the elastic characteristics of the absorbent body provided in the solid portion.

  In the absorbent article described in Patent Document 4, a fold line is formed in advance in a band-shaped main body having an absorbent body. This fold line is provided behind the central axis of the main body. Moreover, the absorbent article described in Patent Document 5 forms a pair of compressed grooves along the longitudinal direction in a band-shaped main body having an absorbent body, and further, the above-described Patent Document 4 between these compressed grooves. A fold line equivalent to is formed. According to the absorbent articles described in these Patent Documents 4 and 5, when receiving the compressive force in the width direction by the user's thigh, the main body bends along the fold line, and therefore the surface of the main body has this fold line. A portion protruding in a convex shape with respect to the user's skin side is formed. In this way, the belt-shaped main body can be brought into contact with the vaginal opening and the groin groove.

In addition, the absorbent article described in Patent Document 6 has an absorbent body that is divided into first and second legs so as to spread at both ends in the width direction toward the rear end of the main body. It is disclosed that an elastic member extending in the longitudinal direction is provided near the center in the width direction between the leg and the second leg.
JP-A-11-104168 JP 2000-89933 A Japanese National Patent Publication No. 11-500940 Patent 0534768 JP 2004-208919 A JP-T-2004-514537

  However, since the absorbent article described in Patent Document 1 is in contact with the user's body in a state where the absorber is curved in a concave shape, the elastic member is in an expanded state. Further, for example, when the user takes a posture on his / her back, the absorber is more curved, and the elastic member is further stretched. Thus, in a state where the absorber is excessively curved, the elastic member is slackened, and the contraction stress for bringing the upper layer portion into contact with the absorber is reduced. Moreover, the same subject is mentioned also about the absorbent article of patent document 2. FIG.

  Further, in the absorbent article described in Patent Document 3, since the three-dimensional part has a three-dimensional shape having a substantially triangular cross section along the width direction, if the main body is excessively curved along the longitudinal direction, the three-dimensional part Will buckle, thus creating a gap between the three-dimensional part and the body.

  In the absorbent articles described in Patent Documents 4 and 5, the absorbent body has a uniform material configuration in the width direction. Therefore, when the absorbent body is mountain-folded in the longitudinal direction of the main body by a fold line, the absorbent body extends along the longitudinal direction. If a straight fold line is formed, and the top of the fold is deformed in accordance with the curved state of the body, the distance between the top and the width in the lateral direction is smaller Since it decreases, the excessive length is buckled, resulting in a bent portion and a gap with the body.

  Further, the groove of the buttocks has an extremely narrow portion where the meats of the left and right buttocks meet, and menstrual blood may flow in such a narrow portion. However, the convex part formed by bending the above-mentioned absorber is too thick for such a narrow part, and therefore, excessive resistance is given to the groove of the buttock, which makes the user feel uncomfortable. End up. Moreover, since the tip of the convex portion has a rounded shape due to the thickness of the absorber, there is a possibility that a gap may be formed without being able to match the narrow groove of the user.

  In the absorbent article described in Patent Document 6, an elastic material provided near the center in the width direction of the relatively thin and low-rigidity portion between the first leg and the second leg provided at the rear end portion of the product As a result, the product is formed with ridges on the product use surface side in the length direction. The shape of the bulge is determined by the rigidity of the thin part between the angle between the first leg and the second leg, the contraction stress of the elastic member and the position of the elastic member. Although it becomes a state, when the absorber is contracted by the stress of the elastic member to form a bulge that can enter the groove of the body, the distance in the length direction near the top of the bulge decreases, resulting in uneven wrinkles, Not only can the flow of menstrual blood be prevented, but the rigid material can wrinkle, which can cause a great sense of discomfort to the user.

  The present invention has been made in view of the problems as described above, and at least a part of the center of the body in the width direction, from the user's labium to the perineum (posterior labia commissure), the anus, and the tailbone. The three-dimensional part having a three-dimensional shape that comes into contact with the groove of the body protrudes in the skin direction so as to stably come into contact with the body, and even if this three-dimensional part curves in the length direction, it is uneven and has large wrinkles. It aims at providing the absorbent article which does not produce.

  The inventors of the present invention have made extensive studies to solve the above problems. As a result, by providing a flexible part that follows the three-dimensional part below the three-dimensional part, the three-dimensional part is brought into contact with the body groove without any gap, and the three-dimensional part is curved even in the longitudinal direction. The present inventors have found that an absorbent article that does not cause wrinkles can be provided, thereby completing the present invention. Specifically, the present invention provides the following.

  (1) a substantially vertically long main body having a liquid-permeable surface material, a liquid-impermeable back material, and an absorber provided between the surface material and the back material; A three-dimensional part provided on the surface material side and extending along a central axis in the longitudinal direction of the main body part, and in an area located below the back material side of the three-dimensional part The absorbent article in which the flexible part which can be raised along the rising direction of the three-dimensional part is formed.

  According to the absorbent article of (1), when a compressive force acts on the main body portion in the width direction, the flexible portion rises along the rising direction of the three-dimensional portion. When the flexible portion rises, a stress that causes the three-dimensional portion located on the surface material side from the flexible portion to abut on the user's body acts, so that the three-dimensional portion can be kept in stable contact.

  (2) The absorbent article according to (1), wherein the flexible portion is formed by reducing the basis weight and / or thickness of the absorbent body in the region from a portion other than the region.

  The absorbent article (2) is characterized in that a flexible portion is formed by reducing the weight and / or thickness of the absorbent body. Therefore, when a compressive force acts on the main body portion in the width direction, the flexible portion rises more reliably.

  (3) The absorbent article according to (1), wherein the flexible part is formed by forming at least one selected from a slit, an emboss, and a punched part in a part of the absorber in the region.

  The absorbent article (3) is characterized in that at least one selected from a slit, an emboss, and a punched part is formed in a part of the absorbent body. By subjecting the absorber to processing such as slits, embossing, and punched portions, the rigidity of the absorber can be partially changed. Therefore, when the flexible portion is raised, the position of the top of the raised portion is easily determined, and stable deformation can be performed. Further, even if an absorber having a high rigidity and is difficult to bend is used, the rigidity can be partially changed, so that the absorber can be easily deformed.

  (4) The absorbent article according to (1), wherein an elastic member capable of contracting along the longitudinal direction is disposed in the region.

  The absorbent article (4) is characterized in that an elastic member capable of contracting along the longitudinal direction is disposed in a region where the flexible portion is formed. By disposing such an elastic member, contraction stress that curves in the vertical direction acts on the main body portion and the three-dimensional portion. Therefore, when the force acts on the main body in the width direction and the flexible part rises to form the top part, the contraction stress due to the elastic member is applied to the flexible part that is difficult to bend in the vertical direction. By acting, the bending of the flexible portion in the vertical direction can be facilitated.

  (5) The absorbent article according to (1), wherein the flexible part is formed by not providing the absorber in the region.

  The absorbent article of (5) is characterized in that a flexible part is formed by not providing an absorbent body partially. Therefore, the rigidity of the flexible portion can be remarkably reduced as compared with the region where the absorber is provided. Therefore, the deformation of the flexible portion can be facilitated.

  (6) The absorbent article according to claim 1, wherein a reinforcing material is disposed in the region along the longitudinal direction on the left and right sides of the flexible portion in the width direction.

  According to the absorbent article of (6), when the reinforcing material is provided in the regions located on the left and right sides of the flexible portion, the reinforcing material is raised when the flexible portion rises against the force acting in the width direction. Acts as a trigger for Therefore, the three-dimensional part is raised with a stable shape.

  (7) The absorbent article according to any one of (1) to (6), wherein a length in the width direction of the flexible portion is formed to be longer than a length in the width direction of the three-dimensional portion.

  According to the absorbent article of (7), since the width of the three-dimensional part is formed narrower than the width of the flexible part, when a force in the width direction acts on the main body part and the flexible part rises, the three-dimensional part The region where the part contacts the main body part is raised while being substantially flat. Thereby, the three-dimensional part can be deformed without being affected by the deformation of the flexible part.

  (8) The length of the flexible portion in the width direction is formed such that the position corresponding to the buttock where the user's buttocks abuts is longer than the position corresponding to the tailbone where the user's tailbone abuts (1). The absorbent article according to any one of (7) to (7).

  According to the absorbent article of (8), the length of the flexible portion in the width direction is formed so that the position where the user's buttocks abuts is longer than the position where the user's tailbone abuts. Therefore, the position where the buttocks abuts is higher than the position where the tailbone abuts against the force acting in the width direction. Thereby, a solid part can be contact | abutted without a gap according to the depth of the groove | channel of a body.

  (9) The absorbent article according to any one of (1) to (8), wherein a compressed groove formed by compressing the absorbent body is provided in the vicinity of both side edges of the three-dimensional portion along the longitudinal direction.

  According to the absorbent article of (9), the rigidity of the main body is increased by providing the compressed groove. Therefore, when a force for bending the main body portion in the vertical direction is applied, the main body portion can be bent with a uniform curvature along the vertical direction without causing bending of the main body portion.

  (10) The absorbent article according to any one of (1) to (9), wherein no dislocation prevention means is provided in a portion where the flexible portion is located on a back material side of the main body portion.

  According to the absorbent article of (10), the portion where the flexible portion is located is not provided on the back material side of the main body portion, so that the flexible portion can be obtained by wearing underwear. Will not be hindered.

  (11) The absorbent article according to any one of (1) to (10), wherein the bending rigidity of the region is lower than the bending rigidity of a portion excluding the region with respect to the compressive force in the width direction of the main body.

  (12) The absorbent article according to (11), wherein the bending stiffness by the Gurley tester in the width direction of the region is 80% or less of the bending stiffness of the portion excluding the region.

  According to the absorbent article of (11) and (12), when a compressive force acts on the main body in the width direction, the flexible part provided with low bending rigidity is preferentially raised. Specifically, as compared with other regions, if the bending rigidity is 80% or less, it is preferably raised.

  (13) The absorbent article according to any one of (1) to (12), wherein the distance reduction rate in the longitudinal bending distance reduction rate test of the region is 30% or less.

  According to the absorbent article of (13), there is no possibility of buckling the three-dimensional part designed for the contraction ratio based on the curvature of the buttock of a standard female figure.

  (14) The absorbent article according to any one of (1) to (13), wherein a stiffness at 20% compression by a compression stiffness test when the flexible portion forms a bulge is from 0.1 N to 2.0 N.

  According to the absorbent article of (14), the compression rigidity of the flexible portion has an ideal rigidity. Specifically, since the flexible portion has an ideal rigidity, it does not cause the user to feel a foreign object or discomfort, and the flexible portion is resistant to the compressive force of general underwear. There is no risk of height fluctuation.

  Stable contact can be maintained by effectively receiving the pressing force from the product body even in the curved state when the product is mounted on the part of the vaginal opening from the corresponding position to the groin groove. Blood flow and leakage can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of each embodiment other than the first embodiment, the same reference numerals are given to those common to the first embodiment, and the description thereof is omitted or simplified.

<First Embodiment>
[Overall structure of sanitary napkin]
With reference to FIG. 1 thru | or FIG. 4, the whole structure of the sanitary napkin 1 which concerns on this embodiment is demonstrated.
FIG. 1 shows a sanitary napkin 1 as an absorbent article according to the first embodiment of the present invention, and is a perspective view showing an appearance in a state where no external force is acting.
FIG. 2 shows a state in which the sanitary napkin 1 is flatly developed, and is a plan view showing the arrangement of the main body portion 10 and the three-dimensional portion 30.
FIG. 3 shows a cross-section taken along line III-III in FIG.
FIG. 4 is a partially broken perspective view including a three-dimensional part 30, showing a cross section taken along line III-III in FIG. 1.

  In the following, among the two surfaces of each element constituting the sanitary napkin 1, the surface facing the body is referred to as “skin-side surface”, and the opposite surface is referred to as “clothing-side surface”. Further, the longitudinal direction of the sanitary napkin 1 is defined as “vertical direction”, and the direction orthogonal to the longitudinal direction is defined as “lateral direction”. Unless otherwise specified, the dimension of each element is the “length dimension” when measured in the vertical direction, and the “width dimension” when measured in the horizontal direction.

  As shown in FIGS. 1 and 2, the sanitary napkin 1 includes a vertically long main body portion 10 and a three-dimensional portion 30 provided on the skin side surface of the main body portion 10 and extending along a central axis in the vertical direction. Prepare.

  As shown in FIGS. 3 and 4, the main body 10 includes a back sheet 11 as a liquid-impermeable back material located on the clothing side surface, and a liquid as an absorber provided on the back sheet 11. An absorbent layer 20, a top sheet 12 as a liquid-permeable surface material covering the liquid absorbent layer 20, and side sheets 13 located at both lateral ends of the skin side surface are provided. These members are bonded to each other with a hot melt adhesive.

  A curved front edge 15a and a curved rear edge 15b similar to the front edge 15a are formed at both ends of the main body 10 in the vertical direction.

  At the front end of the main body 10 at the both ends in the horizontal direction of the main body 10, the front flap 16 protruding laterally from both side ends 22 c of the liquid absorbing layer 20, and behind the front flap 16, A folded flap portion 17 projecting in the lateral direction and a rear flap portion 18 projecting in the lateral direction are formed further rearward than the folded flap portion 17. The front flap portion 16, the folded back flap portion 17, and the rear flap portion 18 are formed by stacking the back sheet 11 and the side sheet 13 and bonding them together with a hot melt adhesive.

  The liquid absorption layer 20 is a band-shaped absorber, and is sandwiched between the back sheet 11, the top sheet 12, and the side sheets 13 in a state of being wrapped with a single wrapping material 23, and the liquid absorption layer The longitudinal direction of 20 and the longitudinal direction of the main body portion 10 are made to coincide with each other and is provided at the approximate center of the main body portion 10. The liquid absorbing layer 20 is bonded to the back sheet 11 and the top sheet 12 with a hot melt adhesive for the liquid absorbing layer.

  At both ends in the vertical direction of the liquid absorbing layer 20, a curved front end 21a and a curved rear end 21b similar to the front end 21a are formed. At both end portions in the horizontal direction of the liquid absorbing layer 20, side end portions 22c are formed which are parallel to the vertical reference line Oy. However, the shape of each edge part 21a, 21b, 22c of the liquid absorption layer 20 is not restricted to this embodiment. Further, the liquid absorption layer 20 has a front end portion 21 a located slightly behind the front edge portion 15 a of the main body portion 10 and a rear end portion 21 b located slightly forward of the rear edge portion 15 b of the main body portion 10. Is provided.

  Edge portions 14c of the side sheets 13 positioned on both sides in the lateral direction are provided so as to be positioned on the inner side of the side end portions 22c of the liquid absorbing layer 20. By providing the side sheet 13, it is possible to prevent menstrual blood absorbed by the liquid absorbing layer 20 from bleeding.

  1 and 2 show a plurality of reference lines. Among these, the vertical reference line Oy indicates the horizontal center of the main body 10, and is a reference line extending in the vertical direction from the approximate center of the front edge 15a to the approximate center of the rear edge 15b.

  The vagina-facing reference line X1 is a reference line extending in a direction perpendicular to the vertical reference line Oy between the substantial centers of the folded back flap portions 17 facing each other. The intersection of the vagina facing reference line X1 and the vertical direction reference line Oy is the vagina opening facing reference position. The vaginal opening facing reference position indicates a reference position that serves as a guide to face the center of the vagina when the sanitary napkin 1 is attached to the crotch while being fixed to the undergarment. This standard is derived by the overall design such as the overall shape of the sanitary napkin 1 when viewed from the skin side surface and the shape of the compressed groove 19 formed on the skin side surface.

  The caudal bone facing reference line X2 is a reference line extending in a direction perpendicular to the longitudinal reference line Oy slightly in front of the rear end portion 21b of the liquid absorbing layer. The intersection of the caudal bone facing reference line X2 and the longitudinal reference line Oy is the caudal bone facing reference position. The caudal bone facing reference position indicates a reference position that serves as a guide for facing the caudal bone when the sanitary napkin 1 is worn, similarly to the vaginal opening facing reference position.

  As shown in FIGS. 3 and 4, the three-dimensional part 30 includes a laminated sheet 34 in which an outer sheet 34 a and an inner sheet 34 b formed of a flexible nonwoven fabric are stacked, and between the outer sheet 34 a and the inner sheet 34 b. And a plurality of sandwiched elastic members 32, and a hollow cylindrical member formed by joining both ends of the laminated sheet 34 with a hot-melt adhesive 33.

  The elastic member 32 is a linear elastic body on which a contraction force acts in an extended state. Between the outer sheet 34a and the inner sheet 34b, three elastic members are arranged at equal intervals in an expanded state. When the three-dimensional part 30 is joined to the main body part 10 as will be described later, these elastic members 32 are provided on the skin side surface of the three-dimensional part 30 in the range from the vaginal opening opposing reference position of the main body part 10 to the caudal bone opposing reference position. It is joined to the outer sheet 34a and the inner sheet 34b with a hot-melt adhesive for fixing the elastic member so that the shrinkage stress acts in the direction.

  The three-dimensional part 30 formed in this way is provided on the skin side surface of the topsheet 12 of the main body part 10 with the direction in which the three-dimensional part 30 extends aligned with the vertical reference line Oy. The width of the three-dimensional part 30 in a state in which the sanitary napkin 1 is flatly spread, that is, the width of the three-dimensional part 30 in a state in which the cylindrical three-dimensional part 30 is folded is made smaller than the width of the liquid absorbing layer 20. Is formed. Further, the three-dimensional part 30 and the top sheet 12 are joined to each other at a fixed region 31 provided on the clothing side surface of the three-dimensional part 30 by a hot melt adhesive 41a.

  Specifically, the fixed region 30 is divided into three regions, a front fixed region 31a, a rear fixed region 31b, and a central fixed region 31c. Of these, the front fixed region 31a is the front edge portion 15a of the main body 10. The center fixing region 31c is provided in a region located at the tail bone facing reference position from the rear end of the front fixing region 31a, and is provided in the region located slightly rearward of the vaginal opening opposing reference position. 31b is provided in the area | region located in the rear edge part 15b of the main-body part 10 from the rear end of the center fixed area | region 31c.

  The widths of the front fixing region 31a and the rear fixing region 31b are substantially equal, and are slightly narrower than the width of the three-dimensional part 30 in a state where the sanitary napkin 1 is flatly deployed. Further, the width of the center fixing region 31c is narrower than the widths of the front fixing region 31a and the rear fixing region 31b, and is narrower than the width of the flexible portion 25 described later.

  As described above, the three-dimensional part 30 and the top sheet 12 are joined to each other by the hot melt adhesive 41 a in the fixing region 31 of the three-dimensional part 30. Specifically, a hot-melt adhesive is applied in a band shape in the direction of the vertical reference line Oy in each of the fixed regions 31a, 31b, and 31c. The part 30 is fixed to the top sheet 12. By fixing the three-dimensional part 30 to the top sheet 12 in this way, the portion corresponding to the central fixing region 31c of the three-dimensional part 30, that is, in the range from the vicinity of the vaginal opening opposing reference position of the three-dimensional part 30 to the caudal bone opposing reference position. Corresponding portions can be freely deformed.

  In addition, as described above, in the portion corresponding to the range from the vicinity of the vaginal opening facing reference position to the caudal bone facing reference position of the three-dimensional portion 30, the contraction stress of the elastic member 32 provided in the three-dimensional portion 30 is the direction of the skin side surface. Acts on. For this reason, the part corresponding to the range from the vicinity of the vaginal opening facing reference position to the caudal bone facing reference position of the three-dimensional part 30 has a shape raised toward the skin side surface. The raised shape of the three-dimensional part 30 will be described in detail later with reference to FIG.

  As shown in FIGS. 1 to 3, the skin-side surface of the sanitary napkin 1 is compressed and heated from the skin-side surface of the topsheet 12 with the topsheet 12 and the liquid absorbent layer 20 being stacked. A compressed groove 19 is formed. These compressed grooves 19 are formed substantially parallel to the vertical reference line Oy at positions slightly close to the vertical reference line Oy from both side ends 22c, 22c of the liquid absorbing layer 20.

  By providing such a compressed groove 19, the rigidity of the main body portion 10 is increased, and when the contraction stress of the elastic member 32 acts on the main body portion 10, the main body portion 10 does not bend and the vertical direction is maintained. It can be curved with a uniform curvature along.

  As shown in FIGS. 3 and 4, pressure-sensitive adhesive layers 42 for fixing the sanitary napkin 1 to the user's underwear are provided on the clothing side surface of the back sheet 11 on both the left and right sides of the vertical reference line Oy. In FIG. 5, the belt is coated in a strip shape substantially parallel to the vertical reference line Oy. Further, these pressure-sensitive adhesive layers 42 are not applied to the portions where the flexible portions 25 described later are provided.

  The length dimension L1 along the vertical reference line Oy from the front edge 15a of the main body 10 to the vagina-facing reference line X1 is within the range of 100 mm or more and 200 mm or less rearward, preferably rearward from the front edge 15a. It is located within the range of 100 mm or more and 140 mm or less. In the present embodiment, the length dimension L1 is about 120 mm.

  Since the length dimension L1 + L2 along the vertical reference line Oy from the front edge portion 15a to the rear edge portion 15b of the main body 10 needs to cover at least the vicinity of the anus position from the front end of the user's external genitalia, It is preferable that it is 280 mm or more and 450 mm or less. In the present embodiment, the length dimension L1 + L2 is 350 mm.

  The width dimension W1 between the side end portions 22c of the liquid absorbing layer 20 is preferably a width dimension that allows for easy wearing in consideration of the female body shape, particularly the crotch width. In the present embodiment, the width dimension W1 is 75 mm.

[Structure between vaginal opening facing reference position and caudal bone facing reference position]
With reference to FIG. 5 thru | or FIG. 7, the structure between the vaginal opening opposing reference position and the caudal bone opposing reference position of the sanitary napkin 1 which concerns on this embodiment is demonstrated.
FIG. 5 shows a cross-section taken along line VI-VI in FIG. 1 and is a cutaway perspective view including the main body portion 10 and the three-dimensional portion 30.
FIG. 6 is a broken perspective view showing a section taken along the line VI-VI in FIG. 1 and showing a state in which the sanitary napkin 1 is bent in the vertical direction and a compressive force in the width direction is applied.
FIG. 7 is a cutaway perspective view showing a state in which the three-dimensional part 30 in FIG. 6 is removed.

  As shown in FIG. 5, the flexible part 25 is formed in the center part of the liquid absorption layer 20 by making it partially low density. More specifically, as shown in FIG. 2, in the portion of the liquid absorption layer 20 where the central fixing region 31 c is located, a region that is slightly wider than the central fixing region 31 c is made to have a low density. A band-like flexible portion 25 is formed at the center of the absorbent layer 20 when viewed from the skin side surface in FIG.

  As shown in FIGS. 6 and 7, the portion of the liquid absorption layer 20 where the flexible portion 25 is provided has a lower density than the other portions of the liquid absorption layer 20, so that it goes from both sides to the center in the width direction. Bends easily against force. When the sanitary napkin 1 is worn, such a compressive force is applied from the user's thighs and underwear, whereby the flexible portion 25 is bent into a triangle when viewed from the vertical direction in FIG. 10 and the three-dimensional part 30 are raised to the user's body side.

  In this way, by providing the flexible portion 25, when the sanitary napkin 1 is mounted, a force acts on the three-dimensional portion 25 in the direction of the skin side surface, so the three-dimensional portion 30 enters the body groove, There is no gap between the three-dimensional part 30 and the body groove.

  Of the portion of the topsheet 12 where the flexible portion 25 is provided, the portion in contact with the center fixing region 31c has higher rigidity and is less likely to deform than the other portions. In the present embodiment, since the width of the center fixing region 31c is formed narrower than the width of the flexible portion 25, as shown in FIGS. 6 and 7, a force in the width direction acts on the main body portion 10, When the flexible part 25 is bent and the main body part 10 is raised, the area in contact with the center fixing area 31c of the topsheet 12 is raised substantially flat. Thereby, the three-dimensional part 30 can be raised to the skin side surface without being influenced by the deformation of the flexible part 25.

  Moreover, as shown in FIGS. 6 and 7, the compression grooves 19 and 19 are provided on the skin side surface of the main body 10 on the left and right sides in the width direction at the position where the flexible portion 25 is provided, as described above. Thus, the region where the compressed groove 19 is provided has high rigidity. Therefore, when a compressive force acts on the main body 10 from both sides in the width direction to the center, the compression groove 19 acts as a trigger for bending, and the flexible portion 25 is a symmetrical triangle when viewed from the vertical direction in FIG. The body part 10 and the three-dimensional part 30 are raised to the user's body side.

[Bending rigidity of flexible part]
As described above, when the force acts in the width direction, in order for the liquid absorption layer 20 to bend preferentially in the flexible portion 25, the portion of the liquid absorption layer 20 provided with the flexible portion 25; An appropriate difference in bending rigidity is required for other portions (for example, near both sides of the flexible portion 25 in FIG. 5). More specifically, the bending rigidity value of the flexible part 25 of the liquid absorbing layer 20 measured according to the Gurley bending resistance test is determined by bending of other parts (for example, the vicinity of both sides of the flexible part 25 in FIG. 5). When the rigidity value is 80% or less, more preferably 60% or less, the flexible portion 25 bends preferentially. Here, the Gurley bending resistance test is a J.A. TAPPI (JAPAN TAPPI) “Paper Pulp Test Method” NO. 40-83 “A test method for stiffness of paper and paperboard by the weighted bending method (Gurley method)”.
As a result of measuring the bending rigidity value of the liquid absorbing layer 20 of the present embodiment using a Gurley flexibility tester, the bending rigidity value of the flexible portion 25 of the liquid absorbing layer 20 is the other part (for example, in FIG. 5). The value was 40% with respect to the bending rigidity value in the vicinity of both sides of the flexible portion 25).

[Preferred examples of constituent materials]
The preferable example of the constituent material of the sanitary napkin 1 of 1st Embodiment is demonstrated.
The back surface sheet 11 constituting the clothing side surface of the main body 10 is a polyethylene film having a basis weight of 23 g / m ² . The top sheet 12 is a through-air nonwoven fabric in which synthetic resin fibers are joined with hot air, and is formed of a core-sheath type composite synthetic fiber having a core part made of polyester resin, a sheath part made of polyethylene resin, and a fineness of 2.2 dtex. The side sheet 13 is a spunbonded nonwoven fabric formed of a composite synthetic fiber having a core part made of polypropylene resin, a sheath part made of polyethylene resin and a fineness of 2.2 dtex, and has a basis weight of 22 g / m ² , for example. The liquid absorption layer 20 is a mixture of softwood kraft pulp and a superabsorbent polymer, and the superabsorbent polymer is included in about 3% of the weight of the liquid absorbent layer 20. The basis weight of the liquid absorbing layer 20 is about 150 g / m ² in the region where the flexible portion 25 is formed, and about 400 g / m ^{2 in the} other regions. The wrap material 23 wrapping the liquid absorbing layer 20 is a tissue having a basis weight of about 15 g / m ² .

The outer sheet 34a and the inner sheet 34b constituting the laminated sheet 34 are formed of, for example, a core-sheath type composite synthetic fiber having a core part of polyester resin, a sheath part of polyethylene resin, and a fineness of 2.2 dtex. This is a through-air nonwoven fabric having a basis weight of about 20 g / m ² . The elastic member 32 is a polyurethane elastic yarn having a fineness of 1880 dtex.

[Effect when wearing]
The operation when the sanitary napkin 1 of the above embodiment is mounted will be described with reference to FIGS. 8 to 13.
FIG. 8 is a side view showing the sanitary napkin 1 in a free state where no external force is applied.
FIG. 9 is a side view showing the sanitary napkin 1 in a state where a compressive force is applied in the width direction.
FIG. 10 is a schematic view showing a cross section taken along line IV-IV in FIG.
FIG. 11 is a schematic view showing a cross section taken along line VV in FIG.
12 is a schematic diagram showing a cross section taken along line VI-VI in FIG.
FIG. 13 is a schematic diagram illustrating a cross section taken along line VII-VII in FIG. 9.

  As shown in FIG. 8, in a state before the sanitary napkin 1 is attached to the body, the main body 10 of the sanitary napkin 1 is curved in a concave shape between the vagina-facing reference line X1 and the caudal-bone facing reference line X2. In this range, the top part 35 of the three-dimensional part 30 is raised to the skin side of the user.

  In addition, as shown in FIG. 9, when the sanitary napkin 1 is worn on the body, a compressive force acts in the width direction from the user's thighs and underwear, and the vagina-facing reference line X1 and the caudal-bone facing reference line X2 The flexible part 25 provided between the two is buckled. As a result, a force directed toward the skin side surface acts on the three-dimensional part 30 positioned between the vagina-facing reference line X1 and the caudal bone-facing reference line X2, and the three-dimensional part 30 protrudes toward the body side of the user. .

  As shown in FIG. 10, in the vicinity of the vagina-facing reference line X1, since the three-dimensional part 30 is substantially flat and its height is low, the three-dimensional part 30 can come into contact with the vaginal opening without a sense of incongruity. . Further, as shown in FIGS. 11 to 13, the three-dimensional part 30 rises high between the vagina-facing reference line X <b> 1 and the caudal-bone facing reference line X <b> 2, and the width dimension gradually decreases toward the top part 35. Due to the shape, the three-dimensional part 30 can enter the groove in the vicinity of the anus and the groove in the fissured part without resistance. In addition, the part where the rising of the three-dimensional part 30 is greatest at the midpoint between the vagina-facing reference line X1 and the tailbone reference line X2 enters the deepest part of the ruptured part.

[Modification 1]
With reference to FIG. 14, the sanitary napkin 1a which concerns on the modification 1 of this embodiment is demonstrated. FIG. 14 shows a sanitary napkin 1a according to the first modification of the present embodiment, and is a cutaway perspective view cut at a portion where the central fixing region 31c is provided as in FIG.

As shown in FIG. 14, the flexible part 25a is formed in the center part of the liquid absorption layer 20a by substituting with the low-rigidity material partially different from other parts. More specifically, as shown in FIG. 14, in the portion of the liquid absorption layer 20a where the central fixing region 31c is located, a region that is slightly wider than the central fixing region 31c is replaced with a material having low rigidity. Thus, a belt-like flexible portion 25a is formed at the center of the liquid absorbing layer 20a as viewed from the skin side surface. Specifically, the material of the flexible part 25a of the liquid absorption layer 20a is airlaid pulp having a basis weight of 200 g / m ² and a chemical fiber blending ratio of 30%, and the other parts of the liquid absorption layer 20a have a basis weight. Consists of flap pulp with an amount of 400 g / m ² . Thus, since the flexible part 25a was provided with the material with low rigidity, there can exist an effect equivalent to the above-mentioned effect.

[Modification 2]
With reference to FIG. 15, the sanitary napkin 1b which concerns on the modification 2 of this embodiment is demonstrated. FIG. 15 shows a sanitary napkin 1b according to Modification 2 of the present embodiment, and is a cutaway perspective view cut at a portion where a central fixing region 31c is provided in the same manner as FIG.

As shown in FIG. 15, a reinforcing material 27 extending in the vertical direction is further provided in regions located on the left and right of the flexible portion 25 in the surface of the liquid absorbing layer 20. As a material of the reinforcing material 27, a non-woven fabric (corresponding to a weight of 80 to 200 g / m ² ) made of polypropylene, polyethylene, or polyester fiber having a fineness in the range of 2.2 dtex or more and 10.0 dtex or less is subjected to hot embossing to obtain a thickness. A material compressed to 0.5 to 2.0 mm, a 50 to 200 g / m ² air laid pulp (synthetic fiber blending ratio of 30 to 70%), and the like which are similarly heat embossed are preferable.

  By providing such a reinforcing material 27 in regions located on the left and right sides of the flexible portion 25, the reinforcing material 27 acts as a trigger when the flexible portion 25 rises against the force acting in the width direction. To do. Therefore, the flexible part 25 protrudes with a stable shape.

<Second Embodiment>
A sanitary napkin 101 according to a second embodiment of the present invention will be described with reference to FIG. In this embodiment, the structure of the flexible part 125 formed in the liquid absorption layer 120 is different from that of the first embodiment.

  FIG. 16 shows a sanitary napkin 101 according to the second embodiment of the present invention, and is a cutaway perspective view cut at a portion where a central fixing region 31c is provided as in FIG.

  As shown in FIG. 16, a flexible portion 125 is formed in the central portion of the liquid absorbing layer 120 by partially reducing the density. More specifically, as shown in FIG. 16, in the portion of the liquid absorption layer 20 where the central fixing region 31 c is located, a region that is slightly wider than the central fixing region 31 c is directed toward the center in the width direction. By reducing the density, a strip-shaped flexible portion 125 is formed at the center of the liquid absorbing layer 120.

Specifically, in the liquid absorbing layer 120 made of fluff pulp, the width direction center of the region where the flexible portion 125 is formed has a thickness of 5 mm and a basis weight of 150 g / m ^2. The other regions had a thickness of 7 mm and a basis weight of 450 g / m ² .

  In this way, the liquid absorbing layer 120 is made to have a low density as it goes to the center in the width direction, and the flexible portion 125 is formed, so that the rigidity of the flexible portion 125 becomes closer to the center in the width direction. Lower. Therefore, the main body 110 easily buckles with a symmetrical triangular cross-sectional shape when viewed from the longitudinal direction against a force acting on the center from both sides in the width direction.

<Third Embodiment>
With reference to FIG. 17 thru | or FIG. 22, the sanitary napkin 201 which concerns on 3rd Embodiment of this invention is demonstrated. In the present embodiment, the structure of the flexible portion 225 is different from that of the first embodiment.

FIG. 17 is a plan view showing a state in which the sanitary napkin 201 according to the third embodiment of the present invention is flatly developed.
FIG. 18 is a partial cutaway perspective view of the flexible portion 225 of the liquid absorbing layer 220, showing a cross section taken along line VIII-VIII in FIG.
FIG. 19 is a plan view showing the liquid absorbing layer 220a.
FIG. 20 is a plan view showing the liquid absorbing layer 220b.
FIG. 21 is a plan view showing the liquid absorption layer 220c.
FIG. 22 is a plan view showing the liquid absorbing layer 220d.

  As shown in FIGS. 17 and 18, the liquid absorbing layer 220 of the present embodiment is similar to the liquid absorbing layer 20 of the first embodiment in the portion where the central fixed region 31 c is located than the central fixed region 31 c. A flexible portion 225 is formed by forming a slightly wide area at a low density and further engraving a plurality of slits 226 in the low density area. Specifically, these slits 226 are provided with cuts extending in the width direction intermittently along the vertical direction, and the center of the slits 226 in the width direction is a rhombus as viewed from the skin side surface. A punched portion 227 having a shape is formed.

  Thus, by providing the slit 226 and the cutout portion 227 intermittently in a part of the material constituting the flexible portion 225, the liquid absorbing layer 220 has high bending rigidity such as airlaid pulp having a high basis weight. Even when a material that is difficult to bend is used, it can be easily raised against a force acting in the width direction. Further, even when the ridges are bent in the vertical direction in this way, the slits 226 are formed with the punched portions 227, so that the flexible portions 225 are less likely to wrinkle, and therefore easily Can be curved.

  Further, as shown in FIG. 22, a slit 226d extending in the vertical direction may be formed, and in this way, the position where the slit 226d is formed is applied to the top with respect to the force acting in the width direction. Therefore, the flexible portion 225d can be stably deformed.

  The patterns of slits and punched portions provided in the liquid absorption layer 220 are not limited to the patterns shown in FIGS. 17 and 18 described above. Moreover, not only a slit and a punching part but embossing may be performed as long as it is a means for reducing the buckling strength of the material of the liquid absorption layer. For example, even if the slits, punched portions, and embossing of the patterns as shown in FIGS. 19 to 22 are performed, the same effects as those described above can be obtained.

<Fourth embodiment>
A sanitary napkin 301a according to a fourth embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the structure of the three-dimensional part 330a is different from that of the first embodiment.

FIG. 23 shows a sanitary napkin 301a according to a fourth embodiment of the present invention, and is a cutaway perspective view cut at a portion where a central fixing region 31c is provided as in FIG.
FIG. 24 is a partially broken perspective view showing only the three-dimensional part 330a in FIG.

  As shown in FIGS. 23 and 24, the three-dimensional part 330a includes a laminated sheet 34 in which an outer sheet 34a and an inner sheet 34b formed of a flexible nonwoven fabric are stacked, and between the outer sheet 34a and the inner sheet 34b. It is a hollow cylindrical member that includes a plurality of sandwiched elastic members 32 and a fixing region elastic member 337 a and is formed by joining both ends of the laminated sheet 34 with a hot-melt adhesive 33.

  A plurality of the fixed region elastic members 337a are arranged in an expanded state between the outer sheet 34a and the inner sheet 34b. These fixed region elastic members 337a are positioned between the outer sheet 34a and the inner sheet 34b so as to be positioned in the upper layer of the portion where the flexible part 25 is formed when the three-dimensional part 330a is joined to the main body part 10. Is arranged.

  In this embodiment, a polyurethane elastic yarn having a fineness of 1880 dtex is used as the material for such a fixed region elastic member 337a. The elastic member 32 located on the skin side of the three-dimensional part 330a and the elastic member for fixed region 337a located on the center fixing area 31c side of the three-dimensional part 330a preferably have different extension magnifications, specifically In this embodiment, the expansion / contraction magnification of the elastic member 32 is 1.5 times, whereas the expansion magnification of the fixed region elastic member 337a is 1.35 times.

  By providing the fixed region elastic member 337a in this manner, the contraction stress that is curved in the vertical direction acts on the main body portion 10 and the three-dimensional portion 330a. Therefore, the elastic force for the fixed region as described above is applied to the flexible portion 25 which is difficult to bend in the vertical direction by the force acting in the width direction and the flexible portion 25 buckling to form the top portion. The contraction stress of the member 337a acts, and the bending of the flexible portion 25 in the vertical direction can be facilitated.

[Modification 1]
With reference to FIG.25 and FIG.26, the sanitary napkin 301b which concerns on the modification 1 of this embodiment is demonstrated.

FIG. 25 shows a sanitary napkin 301b according to the first modification of the present embodiment, and is a cutaway perspective view cut at a portion where the central fixing region 31c is provided as in FIG.
26 is a partially broken perspective view showing only the three-dimensional part 30 in FIG.

  As shown in FIG. 25 and FIG. 26, a plurality of fixing region elastic members 337 b are provided in a state in which the surface sheet 12 is in contact with the central fixing region 31 c of the three-dimensional part 30 in a state of being extended in the vertical direction. Yes. Specifically, the two fixing region elastic members 337 b are fixed from the inner surface of the top sheet 12 by the fixing sheet 338 b.

  By providing the fixed region elastic member 337b in this way, the contraction stress that is curved in the vertical direction acts on the main body portion 10 and the three-dimensional portion 30, and thus the effect of the sanitary napkin 301a according to the fourth embodiment described above can be obtained. An equivalent effect can be achieved.

<Fifth Embodiment>
With reference to FIG. 27, a sanitary napkin 401 according to a fifth embodiment of the present invention will be described. In this embodiment, the position where the three-dimensional part 430 is provided is different from that of the first embodiment.

  FIG. 27 shows a sanitary napkin 401 according to a fifth embodiment of the present invention, and is a cutaway perspective view cut at a portion where the central fixing region 31c is provided in the same manner as FIG.

  As shown in FIG. 27, the three-dimensional part 430 is arranged so that the central fixing region 31 c of the three-dimensional part 430 is included in the flexible part 25 of the liquid absorbing layer 20 between the top sheet 412 and the liquid absorbing layer 20. Is provided. Moreover, the liquid absorption layer 20 is wrapped with the wrapping material 23, and each fixing region 31a, 31b, 31c of the three-dimensional part 30 is joined to the wrapping material 23 with a hot melt adhesive. Further, in order to facilitate the deformation of the three-dimensional part 430, no compression groove is formed between the top sheet 412 and the liquid absorbing layer 20.

In addition, since the three-dimensional part 430 is provided in the lower layer of the surface sheet 412, you may use the raw material which has an absorptivity for the outer sheet | seat 34a and the inner sheet | seat 34b which comprise the three-dimensional part 430. FIG. Specifically, it is preferable to use an absorbent material such as airlaid pulp having a basis weight of 60 g / m ² and a binder content of 30%. By doing in this way, it can be set as the structure with the high fluid communication property and excellent in the absorptivity.

  Thus, by providing the three-dimensional part 430 in the lower layer of the top sheet 412, the skin-side surface of the sanitary napkin 401 has no interface between the three-dimensional part 430 and the main body part 410. Can be a three-dimensional shape. In addition, by making such a smooth three-dimensional shape, a gap is less likely to occur between the user's body and the sanitary napkin 401.

<Sixth Embodiment>
A sanitary napkin 501 according to a sixth embodiment of the present invention will be described with reference to FIG. In the present embodiment, the structure of the three-dimensional part 530 is different from that of the first embodiment.

  FIG. 28 shows a sanitary napkin 501 according to a sixth embodiment of the present invention, and is a cutaway perspective view cut at a portion where a central fixing region 31c is provided as in FIG.

As shown in FIG. 28, the three-dimensional part 530 is formed integrally with the main body part 510.
The laminated sheet 534 is formed by stacking the top sheet 512 and the inner sheet 34b. In addition, a plurality of elastic members 32 are extended between the top sheet 512 and the inner sheet 34b. Further, both ends of the laminated sheet 534 in the width direction are fixed to both ends of the liquid absorbing layer 20 in the width direction. Further, at the position where the flexible portion 25 of the liquid absorbing layer 20 is provided, the three-dimensional portion 530 is formed by folding the laminated sheet 534 into a cylindrical shape.

  Thus, by providing the three-dimensional part 530 and the main body part 510 integrally, the interface between the three-dimensional part 530 and the main body part 510 is eliminated on the skin-side surface of the sanitary napkin 501, so that the sanitary napkin 501 is smooth. 3D shape can be made. Moreover, a gap between the user's body and the sanitary napkin 501 is less likely to be generated by using such a smooth three-dimensional shape.

  According to the sanitary napkin 501 of the present embodiment, the same effects as those of the sanitary napkin 401 according to the fifth embodiment described above can be achieved.

<Seventh embodiment>
A sanitary napkin 601 according to a seventh embodiment of the present invention will be described with reference to FIG. In this embodiment, the structure between the three-dimensional part 30 and the surface sheet 12 is different from that of the first embodiment.

  FIG. 29 shows a sanitary napkin 601 according to a seventh embodiment of the present invention, and is a cutaway perspective view cut along a portion provided with a central fixing region 31c as in FIG.

  As shown in FIG. 29, the three-dimensional part 30 and the top sheet 12 are spaced apart. Specifically, the hot melt adhesive is applied only to the front fixed region 31a and the rear fixed region 31b among the fixed regions 31a, 31b, 31c of the three-dimensional part 30, and these coated surfaces Only, the three-dimensional part 30 is joined to the top sheet 12. That is, the center fixing region 31c of the three-dimensional part 30 and the topsheet 12 are spaced apart.

  In this way, by separating the space between the three-dimensional portion 30 and the top sheet 12, the separated portion of the three-dimensional portion 30 can move freely, so that the relative position change between the user's body and the sanitary napkin 601 is changed. Even if this occurs, the three-dimensional part 30 can be kept in contact with the same position on the user's body.

<Eighth Embodiment>
With reference to FIG.30 and FIG.31, the sanitary napkins 701a and 701b which concern on 8th Embodiment of this invention are demonstrated. In the present embodiment, the shape of the flexible portion 725a is different from that of the first embodiment.

FIG. 30 is a plan view showing a state in which a sanitary napkin 701a according to an eighth embodiment of the present invention is flatly developed.
FIG. 31 is a plan view showing a state in which the sanitary napkin 701b is flatly developed.

  As shown in FIG. 30, the liquid absorption layer 720a has a flexible portion 725a having a non-uniform width along the vertical direction. Specifically, the front portion of the flexible portion 725a is formed to have the maximum width slightly behind the vaginal opening facing reference position, and the rear portion of the flexible portion 725a is the central fixed region. The width is slightly wider than the width of 31c.

  Thus, by changing the width of the flexible portion 725a along the vertical direction, each portion of the flexible portion 725a rises at a different height with respect to the force acting in the width direction. Specifically, with respect to the force acting in the width direction, in the flexible portion 725a, slightly raised behind the vaginal opening facing reference position, the height rises according to the width of the flexible portion 725a, and the flexible portion 725a Slightly in front of the caudal bone facing reference position, it protrudes lower in accordance with the width of the flexible portion 725a. In particular, the user's body is easily separated from the surface of the sanitary napkin 701a slightly behind the vaginal opening facing reference position, and the body and the surface of the sanitary napkin 701a are slightly behind the caudal bone facing reference position. As described above, by changing the width of the flexible portion 725a along the vertical direction, the three-dimensional portion 30 of the sanitary napkin 701a is brought into contact with the shape of the body groove without any gap. it can.

  In particular, within the range of 10 mm or more and 100 mm or less behind the vaginal opening facing reference position, the user's body and the surface of the sanitary napkin 701a are easily separated, so the width of the flexible portion 725a is formed wide. In the range of 140 mm or more and 160 mm or less behind the vaginal opening facing reference position, it is difficult to separate the body and the surface of the sanitary napkin 701a. Therefore, it is preferable that the width of the flexible portion 725a be narrow.

  Further, the shape of the flexible portion is not limited to the shape shown in FIG. For example, as shown in FIG. 31, the flexible portion 725b may be formed so as to increase in width as it goes from the caudal bone facing reference position to the vaginal opening facing reference position. Even with the sanitary napkin 701b having the liquid absorbing layer 720b in which the flexible portion 725b is formed, an effect equivalent to the effect of the sanitary napkin 701a can be obtained.

<Ninth Embodiment>
With reference to FIG.32 and FIG.33, the sanitary napkin 801 which concerns on 9th Embodiment of this invention is demonstrated. In the present embodiment, the structure of the liquid absorption layer 820 is different from that of the first embodiment.

FIG. 32 shows a sanitary napkin 801 according to the ninth embodiment of the present invention, and is a cutaway perspective view cut at a portion where the central fixing region 31c is provided as in FIG.
FIG. 33 is a partially broken perspective view showing only the liquid absorbing layer 820 in FIG.

  As shown in FIGS. 32 and 33, a flexible part 825 is formed at the center of the liquid absorption layer 820 by partially cutting out. More specifically, as shown in FIGS. 30 and 31, by absorbing a liquid absorption layer 820 by cutting out a region slightly wider than the central fixing region 31c in a portion where the central fixing region is located, A band-like flexible portion 825 is formed at the center of the layer 820 as viewed from the skin side surface.

  The liquid absorption layer 820 is sandwiched between the back sheet 11, the top sheet 12, and the side sheets 13 in a state of being wrapped with the wrapping material 823, and the longitudinal direction of the liquid absorption layer 820 and the longitudinal direction of the main body 810. It is provided in the approximate center of the main body portion 810 so as to match the direction.

Specifically, when a force acts in the width direction, the wrap material 823 has a fineness of 5.5 dtex, polyethylene, a material having a slightly higher buckling strength so that the flexible portion 825 can maintain a raised shape. It is preferable to use a 40 g / m ² non-woven fabric through-air non-woven fabric made of polypropylene fibers, an airlaid pulp of 60 g / m ^{2 with} a fiber rate of 30 to 70%, and the like.

  Since the flexible part 825 is formed by partially cutting out the liquid absorption layer 820, the rigidity can be remarkably reduced as compared with other parts of the liquid absorption layer 820. Therefore, deformation of the liquid absorption layer 820 in the flexible portion 825 can be facilitated.

<Test Example 1>
In Test Example 1, a bending distance reduction test is performed as a test for determining materials suitable for the top sheet, the liquid absorbing layer, and the back sheet. This bending distance reduction test is based on the measurement of two quantities, the height of the apex described later, and the distance reduction rate.

The bending distance reduction test will be described with reference to FIGS.
FIG. 34 is a perspective view of the sample 80.

  As shown in FIG. 34, the sample 80 includes a rectangular parallelepiped test mount 82 and a sample test piece 81 attached to the test mount 82.

The sample test piece 81 was formed by bonding a top sheet, a liquid absorbing layer having a flexible portion formed thereon, and a back sheet in a layer form with a 5 g / m ² rubber-based hot-melt adhesive. It is cut and formed into a rectangular parallelepiped shape with a length of 100 mm in the vertical direction and a length of 60 mm in the horizontal direction so that the bending portion is located at the approximate center.

The test mount 82 is a rectangular parallelepiped cardboard having a length of 120 mm in the vertical direction and a length of 60 mm in the horizontal direction, and has a basis weight of 310 g / m ² . Two reference lines X3 and X4 are written along the vertical direction at positions 15 mm from both ends of the test mount 82 in the width direction.

  As shown in FIG. 34, the sample 80 is prepared by attaching both ends in the width direction to the two reference lines X3 and X4 of the test mount 82 in a state where the sample test piece 81 is bent in the width direction. Is done.

  FIG. 35 is a view of the sample 80 as viewed from the vertical direction. The height of the top portion described above corresponds to the length of a line that hangs down from the top portion 83 of the sample test piece 81 to the test mount 82, as shown in FIG.

  FIG. 36 is a side view showing a state in which the sample 80 is fixed to the measurement table 90. The measuring table 90 is a model of the curvature rate of the body, and is a table on which a semicircular arc-shaped curved surface having a radius of 110 mm is formed. In Test Example 1, the above-described distance reduction rate is measured using this measurement table 90.

  When the force is applied in the width direction and the flexible portion forms a bulge and is bent along the vertical direction, the vertical length of the top portion 83 formed by the bulge is the length of the flat state. And shorter than The distance reduction rate refers to the ratio of the length of the top in the flat state to the length of the top in the curved state.

  The measurement of the distance reduction rate is performed according to the following procedure in Test Example 1. First, the sample 80 is fixed to the measurement table 90 in a state where the vertical direction thereof is aligned with the bending direction of the measurement table 90. Thus, a ridge is formed on the top of the sample 80 fixed along the curve.

  As shown in FIG. 36, in the top portion 83 of the fixed sample 80, 20 mm is marked by a linear distance at an arbitrary position in the front-rear direction so as to include the portion where the ridges are formed. Next, the sample 80 is fixed to a flat table, and the distance between the marks is measured in a state where the sample 80 is not curved. Such measurement is measured five times for each sample.

  By dividing the distance between the marks measured in this way, that is, the length of the top of the curved state, by the distance between the marks in the flat state, that is, the length of the top of the flat state , Distance reduction rate can be obtained.

  In Test Example 1, Samples 1 to 5 were prepared as samples for performing the bending distance reduction test, and measurements were performed on these samples. Hereinafter, materials constituting the test pieces of Sample 1 to Sample 5 will be described.

The material of the sample 1 of the specimen, using a through-air nonwoven 25 g / ^{m 2} as a topsheet, using a through-air nonwoven 25 g / ^{m 2} as a liquid absorbent layer, air-impermeable polyethylene 23 g / ^{m 2} as a backsheet A film was used.

As the material of the test piece of Sample 2, a 25 g / m ² through-air non-woven fabric is used as the top sheet, 60 g / m ² airlaid pulp is used as the liquid absorbing layer, and 23 g / m ² non-breathable polyethylene is used as the back sheet. A film was used.

The material of the test piece of Sample 3, using a through-air nonwoven 25 g / ^{m 2} as a topsheet, a liquid absorbent layer, used as coated fluff pulp of 200 g / ^{m 2} in the tissue 15 g / ^{m 2,} also A non-ventilated polyethylene film of 23 g / m ² was used as the back sheet.

The specimen 4 material used is a 25 g / m ² through-air non-woven fabric as the top sheet, and 4 layers of 50 g / m ² airlaid pulp as the liquid absorption layer, which are covered with a 15 g / m ² tissue. The non-breathable polyethylene film of 23 g / m ² was used as the back sheet.

The material of the test piece of Sample 5 is a 25 g / m ² through-air non-woven fabric used as a top sheet, and a liquid absorbing layer coated with 600 g / m ² fluff pulp with a 15 g / m ² tissue. A non-ventilated polyethylene film of 23 g / m ² was used as the back sheet.

<Evaluation of Test Example 1>
For each of the above samples 1 to 5, the above-described bending distance reduction test was performed, and the top height of each sample and the distance reduction rate of the wrinkle generating portion were measured. The measurement results are shown in Table 1. In Table 1, the virtual distance reduction rate is a value represented by the virtual distance reduction rate = 100 − {(110−h) / 110} (%) where the height of the top is h (mm). It is.

  Further, as a result of the measurement, whether or not each sample is a material suitable for a sanitary napkin is evaluated depending on whether or not two determination criteria are satisfied. The two criteria are whether the distance reduction rate is 30% or less and whether the distance reduction rate is lower than the virtual distance reduction rate, and only when both criteria are satisfied. Evaluates that the sample material is suitable for sanitary napkins.

  Among the above judgment criteria, the criteria as to whether the distance reduction rate is 30% or less is based on the physical properties of the three-dimensional part. Specifically, when the distance reduction rate is 30% or more, there is a risk of buckling in the three-dimensional part in which the contraction ratio is designed based on the curvature of the buttock of a standard female figure. In addition, when the distance reduction rate exceeds the virtual distance reduction rate, the flexible portion is bent so much that it does not match the curvature of the body, so that the three-dimensional portion does not follow the body. Judgment criteria are provided for the reasons described above.

  As a result of the measurement, Sample 2, Sample 3, and Sample 5 showed a result that the distance reduction rate was 30% or less and the distance reduction rate was lower than the virtual distance reduction rate. Therefore, from the viewpoint of the distance reduction rate at the top when bent, the materials constituting Sample 2, Sample 3, and Sample 5 are suitable materials for the top sheet, liquid absorption layer, and back sheet of the sanitary napkin. It can be said.

<Test Example 2>
In Test Example 2, a compression rigidity test and its results when the flexible part forms a bulge will be described. Specifically, in this compressive rigidity test, the compressive rigidity of the raised portion of the flexible portion is measured. In addition, the same thing as the sample 1 thru | or the sample 5 used by the above-mentioned Test example 1 is used for a measuring object.

  A compression tester equipped with a measurement table and a measurement terminal is used for measuring the compression rigidity. Specifically, this compression tester measures stress by pressing (compressing) a measurement terminal against an object placed on a measurement table.

  In the test example 2, the compression rigidity is measured according to the following procedure. First, the height of the top of the sample 80 is measured. Next, the sample 80 is placed on the measurement table with the raised flexible part facing the measurement terminal. Then, press contact of the measurement terminal toward the bulge in the center of the sample is started at a speed of 20 mm / min, and the stress corresponding to the change in the height of the bulge of the flexible portion is measured. Also, in this measurement, the load (stress) at a position where the height of the bulge of the flexible portion is about 20% of the height of the top measured in advance with the time when the load is applied to the measurement terminal as a reference position. ). This measurement is repeated 5 times.

<Evaluation of Test Example 2>
Table 2 shows the measurement results of the compression stiffness of Sample 1 to Sample 5 used in Test Example 1.

  In addition, as a result of the measurement, each sample has a load (the load at the time of 20% compression in Table 2) when the bulge of the flexible portion is compressed to 20% within a range of 0.1 N to 2.0 N. Whether or not the material is suitable for the sanitary napkin is evaluated. When the load at 20% compression is less than 0.1 N, the compression rigidity of the flexible portion is too small, and the height of the flexible portion may fluctuate with respect to the compression force of general underwear. . Moreover, when the load at the time of 20% compression is larger than 2.0 N, the compression rigidity of a flexible part is too large, and a foreign material feeling and discomfort are produced with respect to a user.

  As a result of the measurement, Sample 2, Sample 3, and Sample 4 showed a result that the load during 20% compression was in the range of 0.1 N to 2.0 N. Therefore, from the viewpoint of the compressive rigidity of the flexible portion, the materials constituting Sample 2, Sample 3, and Sample 4 can be said to be suitable materials as the top sheet, liquid absorbing layer, and back sheet of the sanitary napkin. .

It is a perspective view which shows the external appearance of the sanitary napkin which concerns on 1st Embodiment of this invention. It is a top view showing the state where the sanitary napkin concerning a 1st embodiment was developed flat. FIG. 3 is a cutaway perspective view taken along line III-III in FIG. 1. FIG. 3 is a partially broken perspective view taken along line III-III in FIG. 1. It is a fractured perspective view of the VI-VI line in FIG. It is a fractured perspective view of the VI-VI line in FIG. It is a fractured perspective view which shows the state which removed the solid part in FIG. It is a side view which shows the sanitary napkin of the free state which the external force is not acting. It is a side view which shows the sanitary napkin in the state to which the external force of the width direction acted. It is the schematic which shows the cross section of the IV-IV line in FIG. It is the schematic which shows the cross section of the VV line in FIG. It is the schematic which shows the cross section of the VI-VI line in FIG. It is the schematic which shows the cross section of the VII-VII line in FIG. It is the fracture | rupture perspective view cut | disconnected in the part in which the center fixed area | region was provided of the sanitary napkin which concerns on the modification 1 of 1st Embodiment. It is the fracture | rupture perspective view cut | disconnected in the part by which the center fixed area | region was provided of the sanitary napkin which concerns on the modification 2 of 1st Embodiment. It is the fracture | rupture perspective view cut | disconnected in the part provided with the center fixed area | region of the sanitary napkin which concerns on 2nd Embodiment. It is a top view which shows the state which expand | deployed flat the sanitary napkin which concerns on 3rd Embodiment. It is a partially broken perspective view which shows the cross section of the VIII-VIII line in FIG. It is a top view which shows a liquid absorption layer. It is a top view which shows a liquid absorption layer. It is a top view which shows a liquid absorption layer. It is a top view which shows a liquid absorption layer. It is the fracture | rupture perspective view cut | disconnected in the part provided with the center fixed area | region of the sanitary napkin which concerns on 4th Embodiment. FIG. 24 is a partially broken perspective view showing only a three-dimensional part in FIG. 23. It is the fracture | rupture perspective view cut | disconnected in the part by which the center fixing | fixed area | region was provided of the sanitary napkin which concerns on the modification 1 of 4th Embodiment. FIG. 26 is a partially broken perspective view showing only a three-dimensional part in FIG. 25. It is the fracture | rupture perspective view cut | disconnected in the part provided with the center fixed area | region of the sanitary napkin which concerns on 5th Embodiment. It is the fracture | rupture perspective view cut | disconnected in the part provided with the center fixed area | region of the sanitary napkin which concerns on 6th Embodiment. It is the fracture | rupture perspective view cut | disconnected in the part provided with the center fixed area | region of the sanitary napkin which concerns on 7th Embodiment. It is a top view which shows the state which expand | deployed the sanitary napkin which concerns on 8th Embodiment flatly. It is a top view which shows the state which expand | deployed the sanitary napkin flat. It is the fracture | rupture perspective view cut | disconnected in the part provided with the center fixed area | region of the sanitary napkin which concerns on 9th Embodiment. FIG. 33 is a partially broken perspective view showing a liquid absorbing layer in FIG. 32. It is a perspective view of the sample used for the test example. It is the figure which looked at the sample used for the test example from the vertical direction. It is a side view which shows the state which fixed the sample used for the test example to the measurement stand.

Explanation of symbols

1, 1a, 1b, 101, 201, 301a, 301b, 401 Sanitary napkin 501, 601, 701a, 701b, 801 Sanitary napkin 10, 110, 410, 510, 810 Main body part 11 Back sheet 12, 412, 512 Surface Sheet 19 Compressed groove 20, 20a, 120 Liquid absorbing layer 25, 25a, 125, 225, 225d, 725a Flexible portion 30, 330, 330a, 430 Three-dimensional portion 337a, 337b Elastic member for fixing region

Claims (14)

A liquid-permeable surface material, a liquid-impermeable back material, and a substantially vertically long main body having an absorber provided between the surface material and the back material;
Wherein provided on the surface material side of the main body portion, an absorbent article and a extension building embossed part along the longitudinal center axis of said body portion,
The regions under side of the solid portion is raised possible flexible portions along the ridge direction of the three-dimensional portion is formed,
The three-dimensional portion includes a laminated sheet in which an outer sheet disposed on a user's skin contact surface side and an inner sheet disposed on a non-skin contact surface side of the outer sheet are stacked on each other, the outer sheet, and the And an elastic member that is sandwiched between inner sheets and extends in the longitudinal direction of the three-dimensional part . The absorbent article is formed in a hollow cylindrical shape by joining both ends in the width direction of the laminated sheet .   The absorbent article according to claim 1, wherein the flexible portion is formed by reducing the basis weight and / or thickness of the absorbent body in the region from a portion other than the region.   The absorbent article according to claim 1, wherein the flexible portion is formed by forming at least one selected from a slit, an emboss, and a punched portion in a part of the absorbent body in the region.   The absorbent article according to claim 1, wherein an elastic member capable of contracting along the longitudinal direction is disposed in the region.   The absorbent article according to claim 1, wherein the flexible portion is formed by not providing the absorber in the region.   The absorbent article according to claim 1, wherein a reinforcing material is disposed in the region along the longitudinal direction on the left and right sides of the flexible portion in the width direction.   The absorbent article according to any one of claims 1 to 6, wherein a length in the width direction of the flexible portion is formed to be longer than a length in the width direction of the three-dimensional portion.   The length in the width direction of the flexible portion is formed so that the position corresponding to the buttock where the user's buttocks abuts is longer than the position corresponding to the tailbone where the user's tailbone abuts. Any one of the absorptive articles.   The absorbent article in any one of Claim 1 to 8 in which the compression groove | channel formed by compressing the said absorber is provided along the said longitudinal direction in the both-sides edge vicinity of the said three-dimensional part.   The absorptive article according to any one of claims 1 to 9 which does not provide slip prevention means in a portion in which said flexible part is located among the back material side of said main part.   The absorbent article according to any one of claims 1 to 10, wherein a bending rigidity of the region is lower than a bending rigidity of a portion excluding the region with respect to a compressive force in a width direction of the main body portion.   The absorptive article according to claim 11 whose bending rigidity by a Gurley testing machine in the width direction of said field is 80% or less of bending rigidity of a portion except said field.   The absorbent article according to any one of claims 1 to 12, wherein a decrease rate of the distance in the longitudinal bending distance decrease rate test of the region is 30% or less.   The absorptive article according to any one of claims 1 to 13 whose rigidity at the time of 20% compression by a compression rigidity test when said flexible part formed a bulge is 0.1N to 2.0N.

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