JP4745079B2 - Absorbent articles - Google Patents

Description

  The present invention relates to absorbent articles such as sanitary napkins and incontinence pads.

  Conventionally, as an absorbent article such as a sanitary napkin or an incontinence pad, one in which a leak-proof wall is disposed along the longitudinal direction on each outer side in the width direction is known. The purpose of the leak-proof wall is to deform the absorbent article into a preferable three-dimensional shape that fits the wearer, to improve the adhesion of the wearer to the skin, and to prevent liquid leakage with certainty ( For example, see Patent Document 1 below).

JP-A-8-182702

  However, in the sanitary napkin described in Patent Document 1, the side surface of the absorber is covered with a liquid-permeable surface sheet, and the leak-proof wall is disposed outward in the width direction. The body fluid transmitted on the skin contact surface side or the body fluid once absorbed by the absorbent body may leak into the space between the top sheet and the leak-proof wall at a stretch, and the side leakage prevention property is not sufficient. In addition, the space between the top sheet and the leak-proof wall may be crushed by the movement of the wearer, etc., and the top sheet and the leak-proof wall may be in direct contact, causing body fluid to ooze into the leak-proof wall. It was.

  Accordingly, an object of the present invention is to provide an absorbent article that can further improve the lateral leakage prevention property in an absorbent article having a leak-proof wall.

  The present invention is an absorbent article comprising a top sheet, a back sheet, an absorbent body interposed between both sheets, and a leak-proof wall disposed along the longitudinal direction on the outer side in the width direction of the absorbent body. In addition, a water-repellent side sheet is bonded to each of both side portions in the longitudinal direction of the top sheet, and the side sheet is at least from the skin contact surface side of the absorber in a longitudinal sectional view along the width direction. A double leak-proof structure is formed from the side sheet and the leak-proof wall in the excretion part-facing portion that is disposed across the side surface and is disposed to face the liquid excretion part of the wearer at least when worn. The above object is achieved by providing an absorbent article.

  According to the absorbent article of the present invention, it is possible to further improve the side leakage prevention property in the absorbent article provided with the leak-proof wall.

Hereinafter, the absorbent article of this invention is demonstrated, referring drawings based on the sanitary napkin of 1st Embodiment which is one preferable embodiment.
The sanitary napkin 1 according to the first embodiment includes a liquid-permeable top sheet 2, a liquid-impermeable or liquid-permeable back sheet 3 and a liquid-retaining absorbent body 4, as shown in FIGS. It has. The absorber 4 is interposed between the top sheet 2 and the back sheet 3.

  The sanitary napkin 1 includes, in its longitudinal direction, an excretory part facing part A which is a part disposed opposite to the wearer's liquid excretion part when worn, and the wearer's dorsal side (rear side) than the excretion part facing part A when worn. ), A rear end B, a front end C, and a rear end D. The boundary between the excretory part facing part A and the rear part B in the present embodiment is located at a substantially central part in the length direction of the sanitary napkin 1.

  As shown in FIG. 3, the absorber 4 has a two-layer structure including an upper layer absorber 41 and a lower layer absorber 42. The upper layer absorber 41 is shorter than the lower layer absorber 42 and is narrower. Further, the upper layer absorbent body 41 is not joined to the lower layer absorbent body 42, and is located at the longitudinal center part of the sanitary napkin 1 and at the width direction center part. Therefore, the upper layer absorber 41 forms a so-called middle-high region.

  The “longitudinal direction” and the “width direction” mean “the longitudinal direction of the absorbent article” and “the width direction of the absorbent article”, respectively, unless otherwise specified. The terms “upper surface” and “lower surface” mean “skin contact surface (side surface)” and “non-skin contact surface (side surface)”, respectively.

As shown in FIGS. 1 to 3, a center seal portion 76 is formed on the top sheet 2. The center seal portion 76 is formed by integrally compacting the top sheet 2 and the lower absorbent body 42 of the absorbent body 4, and surrounds the upper absorbent body 41.
The center seal portion 76 joins the top sheet 2 and the lower layer absorber 42, but does not join the top sheet 2 and the upper layer absorber 41. Further, in the plan view, the outer shape of the upper-layer absorber 41 and the outer shape of the center seal portion 76 are substantially the same. Therefore, the upper layer absorber 41 is enclosed in a closed space composed of the top sheet 2 and the lower layer absorber 42.

The top sheet 2 covers the entire region of the absorbent body 4 on the skin contact surface side, but does not cover the side surface 43. The top sheet 2 is not particularly limited as long as it is a liquid-permeable sheet. For example, the top sheet 2 is a concavo-convex sheet having a large number of convex portions 24 protruding toward the skin contact surface as shown in FIG.
The topsheet 2 made of a concavo-convex sheet in the present embodiment includes a first fiber layer 21 on the skin contact surface side and a second fiber layer 22 on the non-skin contact surface side. The first fiber layer 21 and the second fiber layer 22 are partially heat-sealed to form a heat-sealed portion 23. The first fiber layer 21 forms a large number of convex portions 24 having compressive elasticity at portions other than the heat fusion portion 23.

  The concavo-convex sheet is obtained by partially heat-sealing the first fiber layer 21 and the second fiber layer 22 made of a fiber assembly in a predetermined pattern by hot embossing, and then heat the second fiber layer 22 in the horizontal direction. Obtained by contraction. More specifically, for example, heat fusion by heat embossing is performed by using, for example, an embossed surface (such as a peripheral surface of an embossing roll) in which a large number of embossed spins are regularly arranged, the first fiber layer 21 and the second fiber layer 22. This is performed by melting the constituent fibers of the first fiber layer 21 and / or the second fiber layer 22 in the portion that is press-contacted to the first fiber layer 21 side of the laminated body and is thermally pressed by each pin.

  The heat shrinkage of the second fiber layer 22 is, for example, configured by forming the second fiber layer 22 from heat-shrinkable fibers or including the heat-shrinkable fibers in the second fiber layer 22, The heat treatment is performed on the second fiber layer 22 at the same time as the second fiber layer 22 is heat-sealed or after both are heat-sealed. A large number of convex portions 24 are produced by causing the second fiber layer 22 to thermally contract in the horizontal direction and deforming portions other than the heat fusion portion 23 of the first fiber layer 21 into a convex shape.

The large number of heat-sealing portions 23 are regularly formed in a dotted pattern and a staggered pattern. The distance between the heat fusion parts 23 is substantially constant.
Each convex portion 24 has a dome shape, and the inside thereof is filled with fibers constituting the first fiber layer 21. In addition, the interface between the first fiber layer 21 and the second fiber layer 22 in the portion where each convex portion 24 is formed is not bonded but is in a close contact state.

  The constituent fibers of the first fiber layer 21 are preferably those that do not substantially have heat shrinkability, or that do not undergo heat shrinkage below the heat shrink temperature of the constituent fibers of the second fiber layer 22.

  The constituent fiber of the second fiber layer 22 is preferably made of a thermoplastic polymer material and having heat shrinkability. Moreover, it is preferable that the constituent fibers exhibit an elastomeric behavior even after shrinkage. Examples of such fibers include latently crimpable fibers. The content ratio of the latent crimpable fibers in the second fiber layer 22 is preferably 40 to 100% by weight. The latent crimpable fiber can be handled in the same manner as a conventional nonwoven fabric fiber before being heated, and has a property that a helical crimp is developed and contracted by heating at a predetermined temperature. Fiber. By using latently crimpable fibers, both heat shrinkability and elastomeric behavior can be expressed simultaneously.

  The latent crimpable fiber is composed of, for example, an eccentric core-sheath type or side-by-side type composite fiber composed of two types of thermoplastic polymer materials having different shrinkage rates. Examples thereof include those described in JP-A-9-296325 and Japanese Patent No. 2759331. The second fiber layer 22 includes, for example, such latent crimpable fibers, and simultaneously or after heat fusion with the first fiber layer 21, the crimps of the fibers are expressed by heating, Can be shrunk.

  As shown in FIGS. 3 and 5, a water-repellent side sheet 6 is joined to each of both sides in the longitudinal direction of the surface sheet 2. The side sheets 6 are joined to the skin contact surface side of the top sheet 2 and joined so as to extend outward in the width direction from both longitudinal edges of the top sheet 2.

The side sheet 6 is preferably 25% or more of the (longitudinal direction) length of the absorbent body 4 in the longitudinal direction, more preferably 60% or more of the length of the absorbent body 4, and most preferably the length of the absorbent body 4. 100% or more.
The side sheet 6 is preferably disposed in an excretion region (a region where a wing 72 (details will be described later) is formed or a portion protruding outward in the width direction of the central seal portion 76). 5 (details will be described later) is more preferably arranged in a region (excretion portion facing portion A) where it stands completely, and a region in which the leak-proof wall 5 functions (excretion portion facing portion A, rear portion) Most preferably it is arranged in B).
The width of the side sheet 6 is preferably 15 to 60 mm, and more preferably 20 to 40 mm.

  As shown in FIG. 3, the side sheet 6 is disposed across the side surface 43 from at least the skin contact surface side of the absorbent body 4 in a longitudinal sectional view along the width direction. The side sheet 6 in the present embodiment covers the side surface 43 of the absorbent body 4 from the vicinity of the side edge of the absorbent body 4 on the skin contact surface side and is wound on the non-skin contact surface side (back surface sheet 3 side).

  The side sheet 6 is not particularly limited as long as it is a water-repellent sheet, but a spunbonded nonwoven fabric is preferably used. A spunbond nonwoven fabric is a nonwoven fabric containing spunbond. Examples of the spunbond nonwoven fabric include a spunbond single-layer nonwoven fabric, a spunbond-only nonwoven fabric in which spunbonds are laminated, and a nonwoven fabric in which a spunbond and a meltblown are combined into a single layer.

  As the side sheet 6, it is preferable to use a non-woven fabric formed by combining a spunbond and a meltblown. Examples of the non-woven fabric formed by combining the spunbond (S) and the melt blown (M) include SMS, SM, SMMS, and SSMMS non-woven fabric. In particular, SMS nonwoven fabrics are preferable because they are thin and supple, have sufficient water repellency and strength even when they are thin, and have a good balance between vertical and horizontal strength.

  As the constituent fibers of the spunbond nonwoven fabric, for example, polyolefin fibers such as resins mainly composed of polyethylene, polypropylene or propylene-ethylene random copolymer, polyethylene terephthalate fibers or polyamide fibers are preferable, and among these, polyolefin fibers Is preferred. The fiber structure may be a single fiber, or a composite fiber such as a core-sheath fiber or a side-by-side fiber. Fibers using propylene-ethylene random copolymers, core-sheath fibers in which polyethylene terephthalate is the core and polyethylene is the sheath, core-sheath fibers in which polypropylene is the core and polyethylene is the sheath, especially improve the texture and feel. Preferred above.

The width of the boundary region S (see FIGS. 3 and 5) where the topsheet 2 and the sidesheet 6 overlap is preferably 2 to 25 mm, more preferably 5 to 15 mm.
As shown in FIG. 6, the skin contact surface side of the topsheet 2 made of a concavo-convex sheet and the non-skin contact surface side of the side sheet 6 are joined in a dotted pattern at the convex portions 24 of the concavo-convex sheet. Is preferred. In the structure joined in this way, a gap is formed between the adjacent convex portions 24 in the boundary region S. Therefore, the body fluid transmitted in the width direction on the skin contact surface side of the top sheet 2 flows into the boundary region S through the gap between the adjacent convex portions 24 and is temporarily held. Thus, in the boundary region S, a temporary liquid holding space capable of temporarily holding the liquid is formed.

  The top sheet 2 is preferably thicker and more stretchable than the side sheet 6. Due to the difference in thickness and stretchability, the boundary region S is easily curved toward the back sheet 3 side. Specifically, a sheet in which the surface sheet 2 and the side sheet 6 are integrated is stably conveyed by the side sheet 6 that is difficult to stretch when conveyed during manufacture of the absorbent article. 4, since the tensile force due to the thickness of the absorber 4 (particularly the thickness of the medium-high structure portion) is applied to the topsheet 2, the topsheet 2 and the sidesheet 6 are distorted, resulting in bending in the boundary region S. It becomes easy. The ease of bending in the boundary region S can be evaluated by “curvature” measured as follows.

  The top sheet 2 to which the side sheet 6 is bonded is shaped to have a length of 100 mm and a width of 40 mm (the width of the side sheet 6 excluding the boundary region S is 20 mm) so that the longitudinal direction of the sanitary napkin is the length direction. Cut into test specimens. Moreover, the test stand is preferably a cube having a length of 120 mm or more, a width of 60 mm or more, and a height of 40 mm or more and not subjected to corner treatment (chamfering treatment). When using a chamfered test bench, the radius of curvature of the corner is preferably within 1 mm.

  The part of the surface sheet 2 and the boundary area | region S in a test piece is mounted on a test stand. The side sheet 6 (the portion excluding the boundary region S) extends from the end of the upper surface of the test bench and is in a free state. At this time, the side surface of the test table is matched with the boundary line S between the boundary region S and the side sheet 6 in the test piece. Thereafter, the surface sheet 2 and the boundary region S in the test piece were stretched by 5% (so as to be 105 mm), and an adhesive tape having a width of 24 mm (manufactured by Nichiban Co., Ltd., trade name Cello Tape (registered trademark) CT-24). The both ends of the part are fixed. Here, care is taken so that the side surface of the test table and the boundary line between the boundary portion S and the side sheet 6 in the test piece coincide with each other and the adhesive tape does not protrude from the side surface of the test table. Further, in the test table that is chamfered, it is necessary not to fix the boundary portion S of the chamfered position to the test table.

The test piece fixed to the test table in the extended state is bent (bent) along the side surface of the test table, and the distance from the end of the curved test piece in the width direction to the side surface of the test table is determined by the length of the test piece. Measurement is made at three locations along the direction: front, rear and center, and the average is defined as “curvature”. The ease of bending is evaluated based on the value of this “bendability”. 0-10 mm is preferable, as for the curvature of the surface sheet 2 (sheet | seat which has the boundary area | region S) to which the side sheet 6 was joined, it is more preferable that it is 0-7 mm, and it is still more preferable that it is 0-5 mm.
When the same measurement is performed only on the top sheet 2 and the curvature of the top sheet 2 is measured, it is difficult to bend only on the top sheet 2. The bendability of the sheet having the boundary region S is preferably 60% or less, more preferably 40% or less of the bendability of the top sheet 2 (only).

The stretchability of the topsheet 2 and the sidesheet 6 is stretchability measured as follows.
Using a Tensilon tensile tester (model: RTA-100, manufactured by Orientec Co., Ltd.), a test piece cut to 150 mm in the length direction of the absorbent article and 20 mm in the width direction of the absorbent article is fixed to a chuck having an interval of 100 mm. Then, the amount of elongation (mm) when it is pulled at a speed of 300 mm / min until a load of 1 N is applied is measured. Here, the amount of elongation indicates the length of the portion extending from the original length (150 mm).
The stretchability of the topsheet 2 is preferably higher than the stretchability of the side sheet 6, the elongation amount is preferably 2 times or more, and the elongation amount is more preferably 4 times or more.

The back sheet 3 covers the entire area of the absorbent body 4 on the non-skin contact surface side (including the wound side sheet 6), and extends laterally outward from both side edges of the absorbent body 4 in the width direction. A flap 71 is formed. The side flap 71 further extends outward in the width direction at the position of the excretory part facing part A of the sanitary napkin 1 to form a pair of wings 72. The wing 72 is bent and fixed to an outer surface of an underwear such as shorts by an adhesive or the like when worn.
The top sheet 2 and the back sheet 3 respectively extend from the front and rear ends in the longitudinal direction of the absorbent body 4, and are joined to each other at the extended portions to form an end seal portion 73.

  A pair of leak-proof walls 5 and 5 are disposed along the longitudinal direction on the outer side in the width direction of the absorber 4. The leak-proof wall 5 is disposed between the front end portion C and the rear end portion D of the sanitary napkin 1.

The leak-proof wall 5 includes a base wall portion 51 that stands up from the vicinity of the side surface 43 of the absorber 4 and a planar elastic stretchable portion 52 that is connected to the upper end portion 54 of the base wall portion 51. Elastic members 9 (91, 92) are disposed along the longitudinal direction of the sanitary napkin 1 to the elastic stretchable portion 52 to impart elastic stretchability.
The leak-proof wall 5 is provided along the side surface 43 of the absorber 4, and the upper surface (skin contact surface side) of the elastic stretchable part 52 is substantially parallel to the upper surface (skin contact surface side) of the absorber 4. It is. The elastic expansion / contraction part 52 comes into contact with the skin of the wearer at least in the excretion part facing part A at least.

  The elastic stretchable part 52 is connected to the upper end part 54 of the base wall part 51 in a T-shaped cross section. That is, the elastic stretchable part 52 includes an inwardly projecting part 52 </ b> A that projects inward in the width direction of the sanitary napkin 1 from the upper end part 54 of the base wall part 51, and the sanitary napkin 1 from the upper end part 54 of the base wall part 51. The outer projecting portion 52B projects outward in the width direction.

  The projecting widths of the two projecting parts 52A and 52B are different, and the ratio of the projecting width of the inner projecting part 52A and the projecting width of the outer projecting part 52B (the former: the latter) is preferably 3: 2-5. : 1. The inwardly extending portion 52A and the outwardly extending portion 52B each have four thread-like inner elastic members 91 and two outer elastic members 92 (only one is shown in FIG. 3). Are arranged at intervals. The elastic member 9 is disposed at least on the excretory part facing part A and the rear part B of the sanitary napkin 1.

  The leak-proof wall 5 stands in the excretory part facing part A and the rear part B, and in the front end part C and the rear end part D, at least the width direction inner side (inwardly projecting part 52A) of the elastic stretchable part 52. ) Is fixed to the top sheet 2, so that standing is inhibited (not standing). The elastic stretchable part 52 is joined to the skin contact surface side of the topsheet 2 by a front seal part 74 on the front side in the longitudinal direction and a rear seal part 75 on the rear side in the longitudinal direction. Therefore, the sanitary napkin 1 is curved in a concave shape as shown in FIG.

  The leak-proof wall 5 in the present embodiment is formed by fixing the leak-proof wall-forming sheet 53 to other constituent members (such as the back sheet 3 and the side sheets 6) of the sanitary napkin 1. The leak-proof wall forming sheet 53 is a sheet having a constant width in the longitudinal direction, and has a shape in which the upper end portion 54 of the base wall portion 51 and the elastic expansion / contraction portion 52 are continuously provided in a T-shaped cross section. So that it is folded. Therefore, the leak-proof wall forming sheet 53 has two layers in the base wall portion 51 and the elastic stretchable portion 52. In addition, the width | variety of the sheet | seat 53 for leak-proof wall formation is the width | variety of the sheet | seat 53 for leak-proof wall formation of a single-piece | unit state, Comprising: It does not necessarily correspond with the width direction of an absorbent article.

  More specifically, in the excretory part facing part A, as shown in FIG. 3A, the lower end part 55 of the base wall part 51 (the end part opposite to the upper end part 54 on the elastic expansion / contraction part 52 side). Is wound around the non-skin contact surface side of the absorbent body 4. And the wound lower end part 55 is being fixed by well-known joining means, such as an adhesive agent, between the non-skin contact surface side of the wound side sheet 6 and the skin contact surface side of the back sheet 3. . The fixing position in the width direction of the leakage preventing wall forming sheet 53 in the excretory part facing part A is near the lower end part 55 in the base wall part 51.

In the rear part B, as shown in FIG. 3 (c), a part of the leakage prevention wall forming sheet 53 is folded in a mountain fold so as to extend inward in the width direction to form a multilayer part 58. is doing. In the multi-layered portion 58, the folded facing surface is joined by the facing surface joining portion 57 to maintain the folded form.
From the viewpoint of satisfactorily raising the base wall portion 51 of the leak-proof wall 5, the facing surface bonding portion 57 is preferably provided at a position on the outer side in the width direction on the facing surface where the multilayer portion 58 is folded. . By providing the multilayer portion 58, the distance in the thickness direction from the upper end portion 54 of the base wall portion 51 in the rear portion B to the back sheet 3 is shorter than the distance in the thickness direction in the excretory portion facing portion A.

The multilayer portion 58 is formed over a predetermined length in the longitudinal direction of the base wall portion 51. The length of the multilayer portion 58 is preferably 15 to 45%, more preferably 20 to 30%, of the entire length of the portion where the leak-proof wall 5 stands.
Since the sanitary napkin of the present embodiment has the above-described configuration, a double leak-proof structure is formed from the side sheet 6 and the leak-proof wall 5 at least in the excretory part facing part A.

  As materials constituting the top sheet 2, the back sheet 3, the absorbent body 4, and the leak-proof wall 5, materials conventionally used for absorbent articles such as sanitary napkins and incontinence pads can be used without particular limitation. it can. The back sheet 3 may be a single-layer sheet or a laminated sheet, and this laminated sheet may be a laminate of a liquid-impermeable sheet and a liquid-permeable sheet.

The elastic stretchable portion 52 of the leak-proof wall 5 does not use the elastic member 9, and is made stretchable by uneven processing on a stretchable film or nonwoven fabric, a laminate material of stretchable film and nonwoven fabric, or a non-stretchable film. You may be comprised with the provided material etc. Further, the base wall portion 51 may also have elasticity like the elastic elastic portion 52.
In addition, the leak-proof wall 5 in the present embodiment has the base wall part 51 and the elastic expansion / contraction part 52 integrally formed. However, the base wall part 51 and the elastic expansion / contraction part 52 are separately manufactured, It can also be formed by bonding.

  According to the sanitary napkin 1 of the present embodiment, the water-repellent side sheets 6 are joined to the both sides in the longitudinal direction of the top sheet 2, and the side sheets 6 absorb at least in the longitudinal sectional view along the width direction. In the excretion part opposing part A which is arrange | positioned ranging from the skin contact surface side of the body 4 over the side surface 43, and is arrange | positioned at least at the wearer's liquid excretion part at the time of wear, the side seat 6 and the leak-proof wall 5 A double leak-proof structure is formed. Therefore, bleeding of body fluid from the side surface 43 of the absorbent body 4 is prevented by the side sheet 6. In addition, leakage of body fluid over the side seat 6 is prevented by the leak-proof wall 5. Thus, according to the sanitary napkin 1 of the present embodiment, the side leakage prevention performance is greatly improved by the double leakage prevention structure.

  The side sheet 6 is bonded to the skin contact surface side of the top sheet 2 made of a concavo-convex sheet, and temporarily holds the liquid in the boundary region S where the top sheet 2 and the side sheet 6 overlap each other. A space is formed. Therefore, the bodily fluid that moves in the width direction on the skin contact surface side of the topsheet 2 flows into the temporary liquid holding space and is temporarily held, so that the difficulty of bleeding of the bodily fluid from the absorbent body 4 is further improved.

In addition, when the above-mentioned uneven | corrugated sheet is used as the surface sheet 2, if the surface sheet 2 is wound around the non-skin contact surface side of the absorbent body 4 without using the side sheet 6, the uneven sheet has a thickness. Since it is thick, it is difficult to bend, and since it has elasticity, it has high resilience. Therefore, at the time of manufacturing the sanitary napkin 1, it is difficult to transport the top sheet 2 and to wind the top sheet 2. On the other hand, in the present embodiment, the water-repellent side sheets 6 that are thinner than the surface sheet 2 and have less stretchability are used on both sides in the longitudinal direction of the surface sheet 2. Easy to transport and wrap.
In addition, since the side sheet 6 is wound in a beautiful shape, it does not collide, and body fluid does not accumulate there, and it is difficult for leakage to occur.

  Next, a sanitary napkin according to another embodiment of the present invention will be described. About the sanitary napkin of another embodiment, a different point from the sanitary napkin of 1st Embodiment is demonstrated, and description is abbreviate | omitted about the same point. For points that are not particularly described, the description of the sanitary napkin of the first embodiment is applied as appropriate.

  As shown in FIG. 7, the sanitary napkin 1 of the second embodiment does not have the side sheet 6 wound up to the non-skin contact surface side of the absorbent body 4 as compared to the first embodiment. More specifically, the width direction end of the side sheet 6 on the skin contact surface side is the same position as the side sheet 6 in the first embodiment, but the width direction end of the side sheet 6 on the non-skin contact surface side. Does not reach the lower end of the side surface 43 of the absorber 4. Other configurations are the same as those of the first embodiment.

  As shown in FIG. 8, the sanitary napkin 1 of the third embodiment is such that the lower end portion 55 of the base wall portion 51 of the leak-proof wall 5 is the non-skin contact surface of the absorbent body 4 as compared to the second embodiment. It is not caught on the side and is bent outward in the width direction. Other configurations are the same as those of the second embodiment.

  As shown in FIG. 9, the sanitary napkin 1 of the fourth embodiment has a side sheet 6 bonded to the non-skin contact surface side of the top sheet 2 as compared to the first embodiment. Other configurations are the same as those of the first embodiment.

  As shown in FIG. 10, the sanitary napkin 1 according to the fifth embodiment is not substantially T-shaped in the longitudinal cross-section along the width direction of the leak-proof wall 5 as compared with the first embodiment. Specifically, the leak-proof wall 5 stands up from the back sheet 3 and falls inward in the width direction so as to be positioned above the skin contact surface side of the absorber 4. The leak-proof wall 5 is folded back outward in the width direction above the skin contact surface side of the absorbent body 4, and outward in the width direction to a position deviated from above the skin contact surface side of the absorbent body 4. Has a collapsed form. Other configurations are the same as those of the first embodiment.

  In the sanitary napkin 1 of the sixth embodiment, as shown in FIG. 11, the tip of the leak-proof wall 5 is further folded inward in the width direction as compared with the fifth embodiment, It has the form which fell down in the width direction so that it might be located above the skin contact surface side. Other configurations are the same as those of the fifth embodiment.

  As shown in FIG. 12, the sanitary napkin 1 of the seventh embodiment has a side sheet 6 and a leak-proof wall 5 in which a single water-repellent sheet is folded back into a predetermined shape as compared to the third embodiment. Is formed. That is, the side seat 6 and the leak-proof wall 5 are integrally configured. Other configurations are the same as those of the third embodiment shown in FIG.

The absorbent article of the present invention is not limited to the above embodiments, and can be variously modified without departing from the spirit of the present invention.
For example, the absorber is not limited to a form in which both layers are used without joining the two-layer medium-high structure absorber as in the absorber 4 in the above-described embodiment, and a flat shape having no medium-high structure. An absorber or an absorber in which a multilayer structure (medium / high structure) portion is integrated by an adhesive or embossing means can be employed.

In the case of adopting a T-shaped leak-proof wall, each of the inwardly extending portion 52A and the outwardly extending portion 52B may have the same protruding width, and the outwardly extending portion 52B has the inwardly extending portion 52A. The overhang width may be larger than that.
The multilayer portion 58 of the leak-proof wall 5 may be formed by folding a part of the leak-proof wall forming sheet 53 into a mountain fold so as to extend outward in the width direction. The number of folds of the multilayer portion 58, the width of the multilayer portion 58, the position of the opposing surface bonding portion 57 on the opposing surface where the multilayer portion 58 is folded, and the like can be appropriately set.

Each configuration in each embodiment can be appropriately applied to another embodiment.
The present invention can be applied to incontinence pads, panty liners, disposable diapers and the like in addition to sanitary napkins.

FIG. 1 is a perspective view showing a schematic form in a natural state of a sanitary napkin as a first embodiment of the absorbent article of the present invention. FIG. 2 is a plan view showing a state in which the sanitary napkin of the first embodiment is stretched. 3A is a cross-sectional view taken along line IIIA-IIIA shown in FIG. 2, FIG. 3B is a partially enlarged view of FIG. 3A, and FIG. 3C is a cross-sectional view taken along line IIIC-IIIC shown in FIG. It is. FIGS. 4A and 4B are views showing a top sheet in the sanitary napkin of the first embodiment, wherein FIG. 4A is a longitudinal sectional perspective view, and FIG. 4B is a BB sectional view shown in FIG. FIG. 5 is a plan view showing the joint form between the top sheet and the side sheet virtually developed. FIG. 6 is a perspective view showing a temporary liquid holding space in the sanitary napkin according to the first embodiment. FIG. 7 is a longitudinal sectional view (corresponding to FIG. 3A) along the width direction showing the sanitary napkin of the second embodiment. FIG. 8 is a longitudinal sectional view (corresponding to FIG. 3A) along the width direction showing the sanitary napkin of the third embodiment. FIG. 9 is a longitudinal sectional view (corresponding to FIG. 3A) along the width direction showing the sanitary napkin of the fourth embodiment. FIG. 10 is a longitudinal sectional view (corresponding to FIG. 3A) along the width direction showing the sanitary napkin of the fifth embodiment. FIG. 11 is a longitudinal sectional view (corresponding to FIG. 3A) along the width direction showing the sanitary napkin of the sixth embodiment. FIG. 12 is a longitudinal sectional view (corresponding to FIG. 3A) along the width direction showing the sanitary napkin of the seventh embodiment.

Explanation of symbols

1 Sanitary napkin (absorbent article)
2 Surface sheet 3 Back sheet 4 Absorber 5 Leak-proof wall 51 Base wall part 52 Elastic expansion-contraction part 6 Side sheet 9 Elastic member A Excretion part opposing part B Back part

Claims (5)

An absorbent article comprising a top sheet, a back sheet, an absorbent body interposed between the two sheets, and a leak-proof wall disposed along the longitudinal direction on the outer side in the width direction of the absorbent body,
A water-repellent side sheet is bonded to each of the both sides in the longitudinal direction of the surface sheet, and the side sheet is at least from the skin contact surface side of the absorbent body to the side surface in a longitudinal sectional view along the width direction. It is arranged across,
The surface sheet is composed of a concavo-convex sheet having a large number of convex portions protruding to the skin contact surface side, and is thicker and more stretchable than the side sheet,
The skin contact surface side of the surface sheet and the non-skin contact surface side of the side sheet are joined at the convex portions of the surface sheet, and scattered points are formed so that gaps are formed between the adjacent convex portions. Are joined together,
An absorbent article in which a double leak-proof structure is formed from the side sheet and the leak-proof wall at least in the excretion part-facing part that is disposed to face the wearer's liquid excretion part when worn. The top sheet is composed of a first fiber layer on the skin contact surface side and a second fiber layer on the non-skin contact surface side, and a plurality of convex portions are formed on the skin contact surface side of the first fiber layer. the absorbent article of claim 1 wherein being.   The absorbent article according to claim 1 or 2, wherein the side sheet is joined to the top sheet so as to extend outward in the width direction from both longitudinal edges of the top sheet. The topsheet and the boundary region overlaps the top sheet and the side sheet by expansion and contraction of the differences between the previous SL side sheet is any one of claims 1 to 3 which is likely to be curved in the back sheet side the absorbent article according to item 1. The side sheet, the absorbent article according to any one of claim 1 to 4 which is formed from spunbond system nonwoven fabric.

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