JP5848068B2 - Disposable wearing items - Google Patents

Description

  The present invention relates to a disposable wearing article having an absorbent polymer that absorbs bodily fluids.

  In recent years, high absorbent performance has been demanded for disposable wearing articles such as pants-type diapers, and various disposable wearing articles having an absorbent polymer that absorbs body fluid are provided. For example, Patent Document 1 describes a disposable wearing article having a superabsorbent material as an absorbent polymer.

  This disposable wearing article has a back sheet and an absorbent structure arranged on the back sheet. The absorptive structure includes an absorptive layer that includes a front end and a rear end, and a surge layer disposed on the absorptive layer. An absorbent panel is laminated at the front end of the absorbent layer, and a front absorbent region is formed at the front end of the absorbent structure by laminating the absorbent layer and the absorbent panel. Has been. The absorbent layer and the absorbent panel constituting the front absorbent region contain the superabsorbent material described above. According to the disposable wearing article configured in this way, a lot of superabsorbent material is disposed in the front absorbent region that contacts the front side of the wearer to ensure the absorption performance, and the body fluid excreted from the wearer Can be absorbed in the front absorbent region.

JP-A-8-66426 (FIGS. 3, 5, paragraphs 0011, 0015, 0016, etc.)

  However, the conventional disposable wearing articles described above have the following problems.

  A number of superabsorbent materials are arranged in the front absorbent region, and body fluid is intensively absorbed by the front absorbent region. Therefore, only the front absorptive region may become partially heavy with the absorption of body fluid, and only the front absorptive region may be pulled down. Therefore, there is a possibility that a gap is formed between the front absorbent region and the body, side leakage may occur, or the feeling of wearing may deteriorate due to a decrease in fit.

  Then, an object of this invention is to provide the disposable wearing article which can suppress generation | occurrence | production of a feeling of mounting | wearing at the time of absorbing a bodily fluid, and generation | occurrence | production of a leak, ensuring absorption performance.

The disposable wearing article (disposable diaper 1) according to the present invention includes a liquid-permeable top sheet (top sheet 10), a back sheet (absorber back coating sheet 30), and between the top sheet and the back sheet. An absorbent body (absorbent body 40) that is disposed and extends in the front-rear direction and the width direction perpendicular to the front-rear direction extending to the front side and the rear side of the wearer, and is in contact with the urine drainage part of the wearer A urination region (urination region S3), and a buttock region (rear waist region S2) that is disposed behind the urination region and is in contact with the buttock of the wearer, and the topsheet A disposable wearing article in which an absorbent sheet (absorbent sheet 90) in which an absorbent polymer is sandwiched between liquid-permeable sheets is provided between the back sheet and the urination region, the absorbent article Sheet The absorptive sheet is disposed in the buttocks area, and at least one of the urination area and the buttocks area is located in the urine area, and the absorbent body has the buttock from the urine area to the buttocks area. extends toward the region, the guide portion you terminate in front than absorbent polymer region of the absorbent sheet absorbent polymer is sandwiched (central aperture 45, a first side slits 46) are provided, The guide portion and the absorbent polymer arrangement region are provided to be spaced apart from each other in the front-rear direction, and the flange portion expands and contracts in the front-rear direction and the width direction in the front-rear direction and the width direction. The gist of the present invention is that the elastic members (front leg elastic member 5F, rear leg elastic member 5R) are provided.

Moreover, the disposable wearing article (disposable diaper 1) which concerns on this invention is a liquid-permeable surface sheet (surface sheet 10), a back surface sheet (absorber back surface coating sheet 30), the said surface sheet, and the said back surface sheet. And an absorbent body (absorbent body 40) having a width direction perpendicular to the front-rear direction and the front-rear direction that extends between the front side and the rear side of the wearer. A disposable wearing article having a urination region (urination region S3) which is a contact region, and a buttocks region (rear waist region S2) which is disposed behind the urination region and abuts against the wearer's buttocks The absorbent body includes a first region having an absorbent polymer and a second region having a lower basis weight of the absorbent polymer than the first region, and the absorbent body in the buttocks region Is the first region The absorber in the urination region is provided with the second region, and the absorber located at least in the urination region of the urination region and the buttocks region has the urination It extends from a region to the buttock area, the you terminate in front than absorbent polymer region of the first region the absorbent polymer is disposed guiding portion (the central aperture 45, a first side slits 46) The guide portion and the absorbent polymer arrangement region are provided to be separated from each other in the front-rear direction, and the flange region has at least the front-rear direction in the front-rear direction and the width direction. The gist of the present invention is that a stretchable buttocks elastic member (front leg elastic member 5F, rear leg elastic member 5R) is provided.

  According to the disposable wearing article according to the present invention, since the guide portion extending from the urination region to the buttock region is formed, the body fluid absorbed by the urination region can be smoothly guided to the absorbent sheet of the buttock region. By guiding the body fluid from the urination region to the buttocks region, the absorbed body fluid can be held not only by the absorber in the urination region but also by the absorbent sheet disposed in the buttocks region and the absorbent polymer in the first region. it can. An absorption area can be ensured to ensure absorption performance. Therefore, the absorbent capacity of the entire absorbent article can be increased by effectively using the absorbent capacity.

  Moreover, if the urinated urine is held intensively in the crotch part, the absorbent body swells in the crotch part, and the legs are difficult to close, resulting in a great sense of incongruity or difficulty in walking. However, the urine is guided and held centrally on an absorptive sheet far away from the urination region, so that the absorbent polymer swells after the urine absorption in the crotch region and the thickness of the absorbent body increases. While reducing, it is possible to increase the absorption efficiency and reduce leakage.

  In addition, since the buttocks region is provided with a buttocks stretchable member that expands and contracts at least in the front-rear direction, even if the body fluid is absorbed by the absorbent polymer and the buttocks region becomes heavy, the buttocks stretchable member Can be raised.

It is a schematic perspective view of the disposable diaper 1 which concerns on embodiment. It is an expanded top view of disposable diaper 1 concerning an embodiment. FIG. 3 is a cross-sectional view in the width direction of the disposable diaper 1 taken along line X1-X′1 shown in FIG. 2. It is the front-back direction sectional drawing of the disposable diaper 1 along the X2-X'2 line | wire shown in FIG. FIG. 3 is a cross-sectional view in the width direction of the disposable diaper 1 along line X3-X′3 shown in FIG. 2. It is a top view of the absorber which concerns on embodiment. It is sectional drawing along the X1-X'1 line | wire which shows typically the wearing condition of the disposable diaper 1 which concerns on embodiment. It is the top view and sectional view of the absorber of the disposable diaper concerning a modification. It is a top view of the disposable diaper which concerns on a modification.

  Next, an embodiment of the disposable diaper 1 according to the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones. Therefore, specific dimensions and the like should be determined in consideration of the following description. Moreover, the part from which the relationship and ratio of a mutual dimension differ also in between drawings may be contained.

  The disposable wearing article according to the present embodiment is characterized in that a region having a high basis weight of an absorbent polymer that absorbs body fluid is provided in the buttocks region.

(1) Whole schematic structure of disposable wearing article FIG. 1: is a schematic perspective view of the disposable diaper 1 which comprises a disposable wearing article in this embodiment. FIG. 2 is a developed plan view of the disposable diaper 1 according to the present embodiment. FIG. 3 is a cross-sectional view in the width direction of the disposable diaper 1 taken along line X1-X′1 shown in FIG. FIG. 4 is a front-rear direction cross-sectional view of the disposable diaper 1 along the line X2-X′2 shown in FIG. FIG. 5 is a cross-sectional view in the width direction of the disposable diaper 1 taken along the line X3-X′3 shown in FIG. The disposable diaper 1 is a pants-type disposable diaper.

  As shown in FIG. 2, the disposable diaper 1 has a front waistline region S1 corresponding to the wearer's front waistline, a rear waistline region S2 corresponding to the wearer's back waist, and a wear in the front-back direction of the absorbent article 1. Corresponding to the inseam of the wearer, and a urination region S3 that is a region in contact with the urination part of the wearer. The urination region S3 is a region closer to the front side including the center in the front-rear direction of the absorber, and the rear waistline region S2 is a region rearward of the center in the front-rear direction of the absorber and is behind the urination region S3. It becomes a buttocks area | region which is arrange | positioned and contact | abuts a wearer's buttocks.

  In the case of a rectangular absorbent body, in order to make it easier to grasp the front and back of the absorbent body, the absorbent sheet is colored or the front and rear display is printed on the back sheet or misalignment tape to It is desirable to make it easy to identify, particularly in a pad type diaper.

  The front waistline edge 4 located on the outer side in the width direction W of the absorbent article 1 in the front waistline region S1 is joined to the rear waistline edge 6 located on the outside in the width direction W of the rear waistline region S2, and the front waistline edge The disposable diaper 1 is formed in a pants shape by joining the portion 4 ′ to the rear waistline edge portion 6 ′.

  The disposable diaper 1 includes a top sheet 10, an absorber 40, a side sheet 60, a front exterior topsheet 70F, a rear exterior topsheet 70R, an exterior center sheet 100, a front exterior backsheet 80F, a rear exterior backsheet 80R, and the like. These are joined to each other by an adhesive or heat fusion.

  The front exterior topsheet 70F, the rear exterior topsheet 70R, the front exterior backsheet 80F, the rear exterior backsheet 80R, and the exterior center sheet 100 are sheets that constitute the exterior portion of the disposable diaper 1. On the inner side (skin contact surface side) of the front exterior topsheet 70F, the rear exterior topsheet 70R, and the exterior center sheet 100, an absorbent body 40 composed of cotton-like pulp and a polymer water-absorbing polymer is provided.

The top sheet 10 is a sheet that forms a skin contact surface that can be in direct contact with the skin of the wearer. The top sheet 10 is formed of a liquid-permeable sheet such as a hydrophilic nonwoven fabric or woven fabric, an apertured plastic film, or an apertured hydrophobic nonwoven fabric. The topsheet 10 according to the present embodiment is formed of a hydrophilic spunbonded nonwoven fabric having a basis weight of 23 g / m ^{2 made} of polypropylene.

  A second sheet 15 is bonded to the non-skin contact surface side of the top sheet 10. The second sheet 15 is disposed between the top sheet 10 and the absorber 40. By providing the second sheet 15, the absorption speed of the body fluid can be increased and the return of the body fluid after absorption can be suppressed.

Since the absorbent body of the disposable diaper 1 according to the present embodiment has a structure in close contact with the wearer's crotch, it is possible to improve comfort after excretion by suppressing the return of body fluid after absorption. . As the second sheet 15, for example, an air-through nonwoven fabric or an apertured film is used. The second sheet 15 of the present embodiment is formed of 50 g / m ² (hydrophilic) air-through nonwoven fabric.

  The absorber 40 is disposed between the composite sheet obtained by bonding the top sheet 10 and the second sheet 15 and the absorber back surface covering sheet 30. The absorber 40 has a front-rear direction from the front waistline region S1 toward the rear waistline region S2, and a width direction W orthogonal to the front-rear direction. The absorber 40 has an inner direction IN toward the wearer wearing the disposable diaper 1 and an outer direction OUT toward the opposite side to the inner direction. The absorber 40 is formed of a mixed powder such as pulverized pulp or a superabsorbent polymer.

  The absorbent body 40 is a first layer 41 located on the non-skin contact surface side with the wearer, a second layer 42 that is superimposed on the first layer 41 and located on the skin contact surface side of the wearer, It is constituted by. A central opening 45 is formed at the center in the width direction W in the first layer 41 of the absorber 40. A pair of first side slits 46 are formed on both outer sides in the width direction of the central opening 45. The configuration of the absorber 40 will be described in detail later. A center opening part and a 1st side slit function as a curved part mentioned later, and function as a guide part.

  An absorbent sheet 90 is disposed on the skin contact surface side of the absorbent body in the rear waistline region. The absorbent sheet is arranged behind the second sheet 15. The absorbent sheet is a composite sheet sandwiching an absorbent polymer, holds body fluid in the rear waistline region, and prevents the body fluid held by the absorber from returning to the wearer side. The configuration of the absorbent sheet will be described in detail later.

  The absorbent article 1 has a central elastic member 44 disposed so as to overlap the central opening 45 in the thickness direction T of the absorbent article 1.

  By these elastic materials, slits, and the like formed on the absorbent body 40, the absorbent body 40 is configured to bend when the disposable diaper 1 is worn. In the present embodiment, the central elastic member 44 and the central opening 45 constitute a central curved portion, and the first side slit 46 constitutes a first curved portion.

The side sheets 60 are provided at both side ends of the absorbent body 40 in the width direction W so as to integrally wrap the top sheet 10 and the absorbent back cover sheet. The side sheet 60 is formed of a sheet such as a liquid-impermeable nonwoven fabric. The side sheet 60 according to the present embodiment is a polypropylene SMS nonwoven fabric 15 g / m ² .

  Side sheets overlap each other at the end in the width direction of the side sheet 60. A leak-proof elastic material 53 (see FIG. 3) is provided at a portion where the side sheets overlap with each other in a state of extending along the front-rear direction. The side sheet 60 and the leak-proof elastic material 53 constitute a leak-proof wall that prevents lateral leakage of excrement.

  The leak-proof walls are provided along the front-rear direction of the absorbent article 1 at both ends in the width direction of the absorbent body 40. A plurality of leak-proof elastic members 53 are provided along the front-rear direction of the absorbent article 1 in a state of being stretched in the front-rear direction of the absorbent article 1 between the folded side sheets 60.

  The leak-proof elastic material 53 according to the present embodiment uses spandex, and is stretched and fixed two by two with a thickness of 780 dtex and an expansion ratio of 3.0 on the left and right sides. The side sheet 60 is fixed to the non-skin contact surface side of the absorber back surface covering sheet, and is folded back to the top sheet side from both ends in the width direction of the absorber. The side sheets 60 are fixed to the top sheet 10 by applying a plurality of hot melt adhesives in an amount of 0.1 g / m by a bead coating method.

  The exterior topsheet includes a front exterior topsheet 70F disposed in the front waistline region S1, and a rear exterior topsheet 70R disposed in the rear waistline region S2. In the thickness direction T, the front exterior topsheet 70F is disposed between the front exterior backsheet 80F and the absorber 40. In the thickness direction T, the rear exterior topsheet 70R is disposed between the rear exterior backsheet 80R and the absorber 40. In the front-rear direction, the exterior center sheet 100 is disposed between the front exterior topsheet 70F and the rear exterior topsheet 70R.

  The front end portion of the exterior center sheet 100 is joined to the rear end portion of the front exterior topsheet 70F, and the rear end portion of the exterior center sheet 100 is joined to the front end portion of the rear exterior topsheet 70R. The exterior center sheet 100 is disposed across the front exterior topsheet 70F and the rear exterior topsheet 70R. The exterior center sheet 100 is bonded to the surface side of the exterior top sheet by a hot melt adhesive that is continuously applied by a slot coater.

The exterior center sheet 100 is made of a nonwoven fabric or the like. The exterior topsheet according to the present embodiment is made of an SMS nonwoven fabric having a basis weight of 15 g / m ^{2 made} of polypropylene. The exterior center sheet 100 is located on the inner side (skin contact surface side) than the exterior top sheet when worn.

The front exterior topsheet 70F and the rear exterior topsheet 70R are formed such that the width in the width direction W is larger than the urination region S3 in the front waistline region S1 and the rear waistline region S2. The front exterior topsheet 70F and the rear exterior topsheet 70R can be formed of an air-through nonwoven fabric, a spunbond nonwoven fabric, an SMS nonwoven fabric, a waterproof film, or the like. The exterior topsheet according to the present embodiment is composed of an SMS nonwoven fabric having a basis weight of 15 g / m ^{2 made} of polypropylene.

  The front exterior backsheet 80F is provided closer to the non-skin contact surface than the front exterior topsheet 70F in the front waistline region S1. The rear exterior backsheet 80R is provided closer to the non-skin contact surface than the rear exterior topsheet 70R in the rear waistline region S2. One end of the front exterior backsheet 80F (rear exterior backsheet 80R) in the front-rear direction is folded back to the skin contact surface side and wraps the end portion in the front-rear direction of the front exterior topsheet 70F (rear exterior topsheet 70R). Provided.

The front exterior backsheet 80F and the rear exterior backsheet 80R can be formed of an air-through nonwoven fabric, a spunbond nonwoven fabric, an SMS nonwoven fabric, a waterproof film, or the like. The front exterior backsheet 80F and the rear exterior backsheet 80R according to the present embodiment are made of a spunbonded nonwoven fabric having a basis weight of 17 g / m ^{2 made} of polypropylene.

  The absorber back surface covering sheet 30 is partially bonded to the front exterior topsheet 70F, the rear exterior topsheet 70R, and the exterior center sheet 100.

  A waist gather 3 is provided in the front waistline region S1 and the rear waistline region S2. The waist gather 3 has an elongated waist elastic material 3 </ b> A such as a synthetic rubber disposed so as to expand and contract along the width direction W of the absorber 40. 3A of waist elastic materials are the front exterior topsheet 70F, the front exterior backsheet 80F, and the rear exterior topsheet by the adhesive (for example, hot melt adhesive) in the state extended | stretched with respect to the width direction W of the disposable diaper 1. It is joined between 70R and the rear exterior backsheet 80R.

  By disposing the waist elastic material, the disposable wearing article can be held around the waist, and the entire disposable wearing article can be prevented from being pulled down. Therefore, even when the body fluid is held by the absorbent sheet 90 described later and the rear side of the absorber becomes heavy, the absorber is prevented from being pulled down, and a gap is formed between the absorber 40 and the wearer's body. Can be suppressed.

  The waist gather 3 is continuous from one front waistline edge 4 located on the outer side in the width direction W of the absorbent article 1 in the front waistline region S1 to the other front waistline edge 4 ′, and the absorbent article in the rear waistline region S2. 1 from the rear waistline edge 6 located on the outer side in the width direction W to the other front waistline edge 6 ′.

  Leg gathers 5 are formed on the rear exterior backsheet 80R. Leg gathers 5 are formed along the wearer's legs. The leg gathers are formed of an elongated leg-hole elastic material such as synthetic rubber disposed so as to expand and contract. The leg-holes elastic member is configured by a front leg-holes elastic member 5F disposed in the front waistline region S1 and a rear leg-holes elastic member 5R disposed in the rear waistline region S2. The leg gathers 5 are provided so as not to cross the absorber 40.

  The leg elastic member functions as a hip elastic member that suppresses the lowering of the rear waistline region S2 as a hip region by the absorbent sheet 90 described later. When body fluid concentrates on the absorbent sheet 90, the rear waistline region S2 where the absorbent sheet 90 is disposed may be pulled down. However, it is possible to suppress the rear waistline region S2 from being pulled down by arranging the leg-hole elastic material that expands and contracts in the front-rear direction on the outer side in the width direction of the absorbent sheet. From such a viewpoint, it is desirable that the leg-hole elastic material is disposed in the vicinity of the front end portion of the absorbent sheet 90.

  In addition, the collar part elastic member in this invention should just be comprised so that it can expand-contract in the front-back direction in the state before mounting | wearing a wearer. For example, in a state of being worn by the wearer, the front-rear direction in the state before wearing of the part of the absorber 40 arranged in the rear waistline region S2 is the vertical direction. Therefore, the collar elastic member functions to expand and contract in the vertical direction after being worn by the wearer, and to suppress the downward pulling of the rear waistline region S2.

  Moreover, the collar part elastic member in this invention should just be comprised so that expansion-contraction is possible at least in the front-back direction and the width direction, and is comprised so that it can expand-contract not only in the front-back direction but in the width direction. Also good. For example, the elastic member may have a component that expands and contracts in a direction oblique to the front-rear direction and expands and contracts in the width direction and a component that expands and contracts in the front-rear direction. Therefore, it may be arranged to be inclined with respect to the front-rear direction as in the present embodiment, or may be arranged along the front-rear direction.

  The leg-hole elastic material is joined between the front exterior topsheet 70F and the front exterior backsheet 80F, and between the rear exterior topsheet 70R and the rear exterior backsheet 80R.

  Three leg elastic members according to the present embodiment are stretched and fixed at a thickness of 780 dtex and an expansion ratio of 1.5 to 3.5 times. The leg-hole elastic material is arranged with a gradient of magnification applied to each part.

The leg-hole elastic material is fixed by a hot-melt adhesive that is previously applied to the exterior topsheet. The hot melt adhesive is applied by spiral spray. The coating amount of the leg elastic member was 7 g / m ² . Adhesive is applied by a slot coater at a position overlapping at least the leg-hole elastic material in the vicinity of the end of the exterior topsheet (position of about 5 mm from the end). By applying the adhesive in this way, it is possible to prevent the leg-hole elastic material from coming off from the end of the exterior surface sheet.

In addition, when the adhesive is applied by a non-contact type spiral spray, the adhesive near the end portion of the exterior topsheet protrudes, which may cause a manufacturing defect. However, it is possible to prevent the adhesive from protruding by coating with a contact type slot coater. The coating amount of the slot coater was 10 g / m ² .

  The central elastic member 44 is provided along the front-rear direction, and is provided at a position overlapping the central opening 45 in the thickness direction T of the disposable diaper 1. The central elastic member 44 is formed so as to protrude in the inward direction IN, that is, to overlap the absorber 40 along the front-rear direction so that the absorber 40 bends toward the wearer. The central elastic member 44 is disposed in an extended state along the front-rear direction at the center in the width direction of the absorbent article. The central elastic member 44 is disposed in the urination region S3.

  The central elastic member 44 is provided in an extended state between the elastic member covering sheet 43 and the absorber back surface covering sheet 30. The central elastic member 44 is disposed at an expansion ratio of 1.4 to 3.0 times. The central elastic member according to the present embodiment includes a central elastic member located at the center in the width direction and an auxiliary central elastic material located outside the center elastic member in the width direction.

  The central elastic member is disposed at an expansion ratio of 1.4 to 3.0. Three central elastic members according to the present embodiment are extended and fixed at a thickness of 620 dtex and an expansion ratio of 2.5 times. The distance between the central elastic members is 5 mm, and the bonding length is all 120 mm. The central auxiliary elastic member is arranged with 1.2 to 2.5 times lower stress than the central elastic member. The central auxiliary elastic member according to the present embodiment is stretched and fixed one by one with a thickness of 620 dtex and an expansion ratio of 1.8 times. The central elastic member is disposed at 5 mm intervals at the same position in the front-rear direction as the central elastic member with a space of 5 mm in the width direction from both ends.

The central elastic member 44 is spandex and is coated with a hot-melt adhesive by a V slot method. A stretchable nonwoven fabric or the like may be used for the central elastic member 44. The elastic material covering sheet 43 is composed of a sheet such as a nonwoven fabric. In this embodiment, an SMS nonwoven fabric (hydrophobic) made of polypropylene and having a basis weight of 15 g / m ² is used.

  Examples of the material of the central elastic member 44 include synthetic rubbers such as styrene-butadiene, butadiene, isoprene, and neoprene, natural rubber, EVA, stretchable polyolefin, spandex, and polyurethane foam. In addition, as the material of the central elastic member 44, a stretchable nonwoven fabric formed by mixing an elastomer fiber such as urethane or polystyrene and a thermoplastic fiber such as a stretchable polyolefin or polyester, and stretching the mixture. An elastic sheet may be used.

  The side end elastic member 49 is bonded between the absorber back surface covering sheet 30 and the side sheet 60 by an adhesive at both side portions in the width direction of the absorber. The side end elastic member 49 is disposed along the front-rear direction, and is disposed across the urination region S3 and a part of the rear waistline region S2.

  As a fixing means for the side end elastic member 49, there is a hot melt adhesive or the like. The side end elastic member 49 according to the present embodiment uses spandex, and a hot melt adhesive is directly applied by a V slot method. The side end elastic members 49 according to this embodiment are stretched and fixed three by three with a thickness of 780 dtex and an expansion ratio of 2.3 times on both the left and right sides.

  Further, the side end elastic member 49 and the front leg elastic member 5F, and the side end elastic member 49 and the rear elastic member 5R are arranged substantially continuously in plan view. By arranging in this way, it can be expanded and contracted so as to surround the foot pad, and there is an effect of improving the fit of the leg pad and preventing the diaper from shifting or leaking.

In addition, the elongation stress of an elastic material can be measured as follows, for example.
(1) Cut out the entire material sandwiched with the elastic material so as to include all the elastic material forming the convex portion in the width direction. Specifically, for example, in the wearing article according to the present embodiment, in a state where the material sandwiching the central elastic members arranged at intervals of 5 mm is stretched so as not to sag, the width is 13 mm × the length. Cut out 100mm. In the same extended state, 10 mm inside is marked from both ends in the front-rear direction. For the measurement of the elongation stress, a tensile tester (for example, model: 5564) manufactured by Inslon Japan Company Limited or an autograph (for example, model: AGS-1kNG) manufactured by Shimadzu Corporation was used.

  (2) The sample of (1) is sandwiched by the upper chuck so that the marking portion is the inner end of the chuck, and is sandwiched by the lower chuck so that the other marking portion is the inner end of the chuck. The length of the sample between the chucks is 80 mm. When the length of the elastic material used as a gather is shorter than 100 mm, the length of the sample between the chucks is set to 20 mm shorter than the shortest length of the elastic material used as a gather. The initial distance between chucks is set to be shorter than the length (natural length) when the sample is contracted so that the sample is not initially tensioned. The sample is pulled up and down under the condition of 100 mm / min so that the chucks are separated from each other, thereby extending the sample.

  (3) The length of the sample between chucks when the material sandwiching the elastic material is stretched smoothly is 100%, and the sample is stretched until the length between the chucks of the sample reaches 90%. The stress at the time of elongation of the sample at that time is measured, and is defined as the elongation stress of the elastic material. That is, in the present embodiment, the stress at the time of elongation when the sample is stretched to 72 mm, which is 90% with respect to the 100% length dimension of 80 mm, is measured.

Further, the thickness of the absorber 40 is measured by sandwiching a portion to be measured by the thickness measuring instrument in a state where it is extended to the product length and product width of the absorber 40 (that is, in a flat state so as not to be wrinkled). To do. As a usable measuring apparatus, for example, a PEACOCK thickness gauge (measuring part: diameter 5 mm, measuring pressure: 163 g / cm ² ) can be used.

  In addition, you may use the material described in Unexamined-Japanese-Patent No. 2006-346439 for each member which comprises the disposable diaper 1 mentioned above, for example.

(2) Configuration of Absorbent Sheet Next, the absorbent sheet 90 disposed on the skin contact surface side of the absorbent body 40 in the rear waistline region S2 will be described. The absorbent sheet 90 is a composite sheet in which an absorbent polymer 91 is sandwiched between two liquid permeable sheets 92 and 93. For the liquid permeable sheets 92 and 93, for example, a nonwoven fabric is used. The absorbent polymer 91 may be sandwiched between three or more liquid permeable sheets to produce an absorbent sheet, or one liquid permeable sheet may be folded and the absorbent polymer sandwiched between the absorbent polymer. A sheet may be produced.

  The absorbent polymer 91 is a polymer that absorbs water, for example, an absorbent polymer having a three-dimensional network structure in which water-soluble polymers are appropriately crosslinked. Such an absorbent polymer absorbs water several hundred to 1,000 times the volume before absorbing water, but is essentially insoluble in water, and once absorbed water is subjected to some pressure. Does not water off.

  Examples of the absorbent polymer 91 include starch-based, acrylic acid-based, and amino acid-based particulate or fibrous polymers. The absorbent sheet 90 is manufactured by sandwiching the absorbent polymer 91 between the two liquid-permeable sheets 92 and 93 and then joining the two liquid-permeable sheets 92 and 93. In order to prevent the absorbent polymer 91 from spilling after the absorbent polymer 91 is sandwiched between the two liquid-permeable sheets 92, 93, the particle size of the absorbent polymer 91 is It is preferable that it is not fine compared to the fiber gap.

As the liquid permeable sheets 92 and 93, for example, a spunbond nonwoven fabric, a point bond nonwoven fabric, an air-through nonwoven fabric, an SMS nonwoven fabric, or the like can be used. Since the liquid-permeable sheets 92 and 93 need to be permeable to urine, it is preferable that the liquid-permeable sheets 92 and 93 have been subjected to hydrophilic treatment. In this example, 25 g / m ² air-through nonwoven fabric subjected to hydrophilization treatment was used as the liquid-permeable sheets 92 and 93.

  Adhesive portions (not shown) that extend in the front-rear direction and are arranged in the width direction are provided on the surfaces of the liquid-permeable sheets 92 and 93 that sandwich the absorbent polymer 91. Adhesive portions that extend in the front-rear direction and are arranged in the width direction are provided on the surfaces of the liquid-permeable sheets 92 and 93 that sandwich the absorbent polymer 91. In addition, you may provide an adhesive part in the surface which clamps the absorptive polymer 91 of one liquid-permeable sheet 92,93 of the liquid-permeable sheets 92,93. The adhesive portion is formed by, for example, applying a hot melt adhesive in a streak shape.

  Thereby, the absorptive polymer 91 is fixed to the liquid permeable sheets 92 and 93. The adhesive part extends in the front-rear direction and is arranged in the width direction. That is, the reason why the adhesive part is streaked is to provide a region where the adhesive part does not exist because the urine permeability at the adhesive part tends to decrease. It is. Therefore, if the coating method can provide a region where no adhesion portion exists, that is, if the coating method can intermittently arrange the adhesion portion, the application method is not limited to the streaky coating method, and omega coating. For example, a non-contact coating method may be used.

  Since the adhesive portion is provided intermittently in the absorbent polymer arrangement region 96 described later, the absorbent polymer 91 can be prevented from being biased in the absorbent polymer arrangement region 96. The distance between the adjacent adhesive portions of the adhesive portions provided on the liquid permeable sheet 93 on the absorber 40 side is the adhesive portion of the adhesive portion provided on the liquid permeable sheet 92 on the top sheet 10 side. Small compared to the distance between. Thereby, an absorptive polymer is fixed to the liquid-permeable sheet 93 by the side of the absorber 40 equally.

  By providing the liquid-permeable sheets 92 and 93 with stripe-like adhesive portions colored in blue or the like, the absorbent article 1 is provided with a striped pattern of a color such as blue or the like. Appearance is improved. In addition, you may make it provide an adhesion part only in the surface which clamps the absorptive polymer in the liquid-permeable sheet 93 by the side of the absorber 40. FIG. By providing the liquid permeable sheets 92 and / or 93 with an adhesive portion, the absorbent polymer can be prevented from moving in the absorbent sheet 90 before the absorbent polymer swells. The absorbent sheet 90 is preferably disposed in at least a part of the rear waistline region S2 extending from the center in the front-rear direction of the urination region S3 to the rear waistline region S2.

  As described above, the absorbent polymer is intensively arranged in the rear waistline region S2, thereby improving the absorption capacity in the rear waistline region S2 and improving leakage from the rear waistline region, which is often in the sitting position and the sleeping posture. can do.

  In the absorbent sheet 90, the absorbent polymer is divided into a plurality of absorbent polymer placement regions 96 (hereinafter referred to as absorbent polymer placement regions), and the absorbent polymer is disposed between the respective absorbent polymer placement regions 96. A region (hereinafter referred to as an absorptive polymer non-arrangement region) 97 in which is not disposed is provided. In FIG. 2, the absorbent polymer arrangement region 96 is indicated by hatching.

  By alternately providing the polymer arrangement region and the polymer non-arrangement region, the absorbent polymer in the absorbent polymer arrangement region 96 absorbs urine and swells, and even when urine cannot be further absorbed, urine is absorbed. It passes through the polymer non-arrangement region 97 and is absorbed by the absorber 40. In addition, about the absorbent article which does not continue using until the absorbent polymer swells, it is not necessary to provide the absorbent polymer non-arrangement region in the absorbent sheet.

  The shape of the absorbent polymer arrangement region 96 in the planar direction is substantially V extending in the front-rear direction of the absorbent article 1 in the direction from the front waistline region S1 to the rear waistline region S2 and extending in the width direction of the absorbent article 1. It is a letter shape. That is, the shape of the absorbent polymer arrangement region 96 in the planar direction is a substantially V shape with the apex facing in the direction from the front waistline region S1 to the back waistline region S2 in the front-rear direction of the absorbent article 1. However, the absorbent polymer arrangement region 96 that is farthest from the front waistline region S1 is a shape formed by cutting out the center in the width direction in a substantially V shape or a substantially arc shape and dividing it into two regions. . Since the substantially V shape of the absorbent polymer arrangement region 96 is a shape along the wearer's buttocks, the absorbent polymer arrangement region 96 fits the wearer's buttocks and is between the wearer and the absorbent article 1. The gap becomes difficult to occur. If the absorbent polymer non-arrangement region exists, the shape of the absorbent polymer arrangement region is not limited to a substantially V shape. For example, the shape of the absorbent polymer arrangement region may be an arc shape, a circle shape, a rectangular shape, a triangle shape, or the like.

  As described above, after the absorbent polymer is sandwiched between the two liquid permeable sheets 92 and 93, the two liquid permeable sheets 92 and 93 are joined to produce the absorbent sheet 90. The region where the absorbent polymer is sandwiched between the two liquid-permeable sheets 92, 93 is the absorbent polymer arrangement region 96, and the absorbent polymer is sandwiched between the two liquid-permeable sheets 92, 93. The region where the two liquid-permeable sheets 92 and 93 are joined together is the absorbent polymer non-arrangement region 97.

  In order to join the two liquid-permeable sheets 92 and 93 to each other, the strength is required to withstand the expansion force caused by the swelling of the absorbent polymer. For example, when the two liquid-permeable sheets 92 and 93 are peeled off due to swelling of the absorbent polymer, a gap is formed between the two liquid-permeable sheets 92 and 93, and the absorbent polymer is formed in the gap. In some cases, the absorbent polymer non-arranged region 97 may be lost. A heat seal, a sonic seal, an adhesive, or the like can be used for joining the liquid permeable sheets 92 and 93 to each other.

  When the liquid-permeable sheets 92 and 93 are bonded to each other by heat sealing, the uniform sealing strength is obtained as the linear pressure in the width direction of the heat sealing becomes constant. For this reason, it is preferable that the linear pressure in the width direction of the heat seal is constant. In order to make the linear pressure in the width direction of the heat seal uniform, it is necessary to make the total length in the width direction of the region to be sealed constant. For example, as described above, the total length of the absorbent polymer non-arrangement region 97 in the width direction is made substantially constant by arranging the absorbent polymer arrangement region 96 in a substantially V shape or a substantially arc shape and arranging them in the front-rear direction. be able to. When the liquid-permeable sheets 92 and 93 are bonded to each other using an adhesive, the liquid-permeable sheets 92 and 93 are in a wet state when the absorbent polymer is swollen. A type that exhibits strength is preferred.

  Since the absorbent polymer swells when it absorbs urine, in the absorbent polymer placement region 96, the absorbent polymer has a volume sufficient for the absorbent polymer to swell between the two liquid-permeable sheets 92 and 93. It is desirable to ensure If the absorbent polymer is packed too densely between the two liquid-permeable sheets 92 and 93, the absorbent polymer cannot be fully swelled, so that the absorbent capacity of the absorbent polymer may not be fully utilized. is there.

  When the number of the absorbent polymer arrangement regions 96 in the absorbent sheet 90 is increased, the area of the absorbent polymer non-arrangement region 97 increases, but the total amount volume of the absorbent polymer in the absorbent sheet 90 is reduced. The amount that 90 can absorb urine is reduced. On the other hand, when the number of the absorbent polymer arrangement regions 96 in the absorbent sheet 90 is reduced, the total amount volume of the absorbent polymer in the absorbent sheet 90 is increased, and the amount that the absorbent sheet 90 can absorb urine is increased. In some cases, the area of the absorbent polymer non-arranged region 97 becomes small, and after the absorbent polymer swells, urine does not pass through the absorbent sheet 90 and is absorbed by the absorber 40.

  Consider the balance between the amount of urine and the urine permeability of the absorbent sheet 90 after the absorbent polymer swells, and further consider the type of absorbent polymer and the volume after swelling from the input amount. Therefore, it is necessary to select the number of the absorbent polymer arrangement regions 96. For example, in the case of an absorbent sheet having a size of 180 mm × 130 mm, 2 g of the absorbent polymer that absorbs 60 g of physiological saline per gram is arranged in five absorbent polymer placement regions, thereby improving the absorbability of urine. An absorbent sheet having a good balance between the urine permeability after the absorbent polymer swells can be obtained.

  The absorbent sheet 90 may be disposed on the non-skin surface side of the absorber 40, but is preferably disposed on the skin surface side. When the wearer takes a sitting or sleeping posture, the urine absorbed by the absorber 40 in the region of the rear waistline region S2 exudes when pressure (body pressure) due to body weight is applied to the absorber 40, but exudates. The absorbed urine is difficult to reach the wearer's skin side by the absorbent sheet 90. Since the absorbent sheet 90 is substantially composed of an absorbent polymer, urine hardly exudes even when body pressure is applied. Therefore, the skin is smooth even after the urine is excreted, and the skin irritation of the wearer due to the excreted urine can be suppressed.

  Further, the absorbent body 90 is configured not to leave the skin even when the absorbent sheet 90 absorbs the liquid and becomes heavy due to the lifting effect of the leg elastic member. Therefore, the gap between the absorber and the skin is less likely to occur, and in particular, the occurrence of leakage caused by the skin can be reduced. In the case where the absorbent body is configured not to be separated from the skin, skin irritation is particularly likely to occur when the body fluid that has oozed from the absorbent body 40 easily reaches the skin side of the wearer. Therefore, it is more preferable to arrange the absorbent sheet 90 on the skin surface side of the absorber 40.

(3) Structure of absorber FIG. 6 is a plan view of the absorber 40. As shown in FIG. 6, the absorber 40 includes a first layer 41 and a second layer 42 that is overlapped with the first layer 41. The first layer 41 is positioned on the wearer's non-skin contact surface side, and the second layer 42 is positioned on the wearer's skin contact surface side.

The first layer 41 and the second layer 42 are composed of cotton-like pulp and a polymer absorbent polymer (SAP). The absorber 40 can be formed, for example, by mixing pulp 0 to 500 g / m ² and SAP 0 to 500 g / m ² .

The first layer 41 according to this embodiment, the pulp 280 g / ^{m 2} and SAP170g / ^{m 2} are formed by mixing a thickness of about 3.1 mm. The second layer 42 according to this embodiment, the pulp 260 g / ^{m 2} and SAP160g / ^{m 2} are formed by mixing a thickness of about 2.9 mm. Therefore, the thickness of the absorber 40 is 6.0 mm.

  In the first layer 41, a central opening 45 and a pair of first side slits 46 are formed. The central opening 45 is formed in the central portion in the width direction W. The central opening 45 and the first side slit 46 have a vertically long shape extending along the front-rear direction. The central opening 45 and the first side slit 46 are formed to extend in the front-rear direction in the urination region S3 and guide the body fluid absorbed by the absorber 40 in the urination region S3 to the absorbent sheet 90 in the rear waistline region S2. It functions as a guide part.

  The rear end portion of the central opening 45 may be disposed so as to overlap the absorbent sheet 90, or may be disposed so as not to overlap the absorbent sheet. Moreover, you may arrange | position so that an absorbent sheet may exist on the extension line which goes to the back of a center opening part.

  By arrange | positioning a center opening part and an absorptive sheet | seat as mentioned above, it becomes easy to bend the center part of an absorber to a wearer's skin side. Furthermore, the body fluid drawn by the absorber through the central opening 45 or the first side slit 46 can be smoothly guided to the rear waistline region S2 through the central opening or the like. By guiding the body fluid to the absorbent sheet 90 disposed in the rear waistline region S2, the body fluid can be preferentially concentrated on a portion having a high absorption capacity.

  Therefore, the absorbent capacity of the entire absorbent article can be increased by effectively using the absorbent capacity. Moreover, if the urinated urine is held intensively in the crotch part, the absorbent body swells in the crotch part, and the legs are difficult to close, resulting in a great sense of incongruity or difficulty in walking. However, the urine is guided and held centrally on an absorptive sheet far away from the urination region, so that the absorbent polymer swells after the urine absorption in the crotch region and the thickness of the absorbent body increases. While reducing, it is possible to increase the absorption efficiency and reduce leakage.

  There is a distance of about 10 mm between the absorbent polymer arrangement region 96 and the central opening 45 in plan view. An intermediate region 110 is defined between the absorbent polymer arrangement region 96 and the rear end portion of the central opening 45. The intermediate region 110 needs to be configured so that the bodily fluid can be diffused even when repeated urination is performed in order to concentrate the bodily fluid on the absorbent polymer arrangement region 96. From such a viewpoint, the weight ratio of the absorbent polymer in the intermediate region needs to be less than 80%. The weight ratio of the absorbent polymer in the intermediate region of the present embodiment is 38%.

In addition, although the guide part which concerns on this Embodiment is comprised by opening, such as a slit formed in the absorber, it is not restricted to this structure. For example, the absorbent body may be constituted by a low basis weight area having a lower basis weight than the surrounding basis weight, or may be constituted by a squeezed portion obtained by compressing the absorbent body in the thickness direction.
For example, when the guide portion is constituted by a low weight area, the weight of the absorbent polymer in the low weight area is lower than the weight of the absorbent polymer in the squeezed portion. It is excellent in that it cannot block the passageway.
In addition, when the guide part is configured by the compressed part, the density is high, and therefore, the diffusibility is excellent. Compared to the case where the guide part is configured by the low weight area, it is particularly active in the direction against gravity. It is excellent in that it can diffuse into

  In addition, the low fabric weight area | region in this invention is an area | region whose fabric weight ratio is 50% or less with respect to the average fabric weight of the absorption layer which comprises the surrounding absorber. The basis weight can be measured, for example, by the following method. First, marking is performed on the surface sheet with dimensions of 10 mm width and 50 mm length in a region to be a product target, and the absorbent body is cut out for each sheet member with the dimensions, and the initial weight is measured. Let this weight be A (g).

  Next, the sheet member (the front sheet, the second sheet, the back surface coating sheet, etc.) cut out together is washed with an organic solvent such as toluene and dried, and then the weight is measured to obtain the total weight of the sheet member. Let this weight be B (g).

Using the initial weight (A) and the weight (B) of the sheet member, the basis weight of the absorbent body is calculated by “(A−B) ÷ sample size”. Specifically, the basis weight X in the present embodiment can be calculated by (A−B) / (10 × 50/1000/1000) (g / m ² ). In addition, although the said weight turns into a weight containing a hot-melt-type adhesive agent, since it is very small compared with the weight etc. of an absorber, you may disregard.
A basis weight ratio is calculated based on the basis weight of the absorbent body determined by the above method.
Weight ratio = (weight of the absorber in the low weight area) / (weight of the surrounding absorbent) × 100
The low basis weight area is an area where the basis weight ratio is 50% or less.
That is, a low weight area is defined as one that satisfies the following conditions.
(Weight of the absorber in the low weight area) / (Weight of the surrounding absorber) × 100 ≦ 50 (%)

  In addition, when the low-weight area is in a place where it does not overlap with another absorption layer (for example, an area formed in the first absorption layer and not covered by the second absorption layer), the target is The basis weight of the absorbing layer in the low basis weight area and the basis weight around the absorbing layer are determined by the above method.

  In addition, when the low-weight area is in a place where it overlaps with another absorption layer (for example, a region formed in the first absorption layer and covered with the second absorption layer), one absorption is obtained. Since it is difficult to measure the basis weight of the low-weight area of the layer, the weight X1 of the overlapping portion of the absorption layer of the target low-weight area is obtained, and then the weight X2 of the absorbent body of the surrounding overlapping portion is obtained, and further overlap The basis weight of the low basis weight area is measured by obtaining the basis weight X3 of the portion of the single layer that is not.

Further, in this case, (1) in the case where the absorption layer having a low basis weight area and the single layer coincide with each other, the low weight area corresponds to (X1−X2 + X3) ÷ X3 × 100 ≦ 50 (%). It can be.
On the other hand, in the case where (2) the absorption layer having the low weight area and the single layer do not match, the low weight area corresponds to (X1−X3) ÷ (X2−X3) × 100 ≦ 50 (%). Can be.
That is, the basis weight can be measured by the above three methods according to the structure of the low basis area.

  Further, by forming the central opening 45, the central portion 40C can be easily bent convexly in the inward direction IN on the wearer side. The first side slit 46 is formed on the outer side in the width direction than the central opening 45. The first side slit 46 has a vertically long shape extending along the front-rear direction. The pair of first side slits 46 are formed in the absorber 40 along the front-rear direction so as to protrude outwardly OUT, that is, the absorber 40 bends in a convex opposite to the central opening 45.

  The second layer 42 has a substantially hourglass shape. The second layer straddles the boundary between the rear waistline region S2 and the urination region S3, and overlaps with the first layer in the width direction inward as viewed in the longitudinal direction toward the urination region. It has a part which becomes a boundary of a non-overlapping part. Since the overlapping portion has higher bending rigidity than the non-overlapping portion, the deformation that bends in the outward direction OUT toward the opposite side to the inward direction by the first side slit in the urination region is the boundary between the overlapping portion and the non-overlapping portion with the first layer. It can comprise so that it may not transmit back rather than the part which becomes.

  The width of the absorber is preferably 120 to 250 mm in the front waistline region S1 and the back waistline region S2, and preferably 120 mm to 250 mm in the urination region S3.

  The length of the central opening 45 in the front-rear direction is longer than the length of the first side slit 46 in the front-rear direction. In the present embodiment, the width of the central opening is 40 mm, and the width of the first side slit 46 is 10 mm.

  In the urination region S3, the outer end 42W in the width direction of the second layer 42 overlaps the inner end 41W of the first side slit 46 of the first layer, and is disposed along the front-rear direction. The outer side in the width direction from the outer end 42W of the absorber 40 is configured only by the first layer 41, and the inner side from the outer end 42W is the first layer 41 except for the portion where the central opening 45 is formed. And the second layer 42. Therefore, the rigidity and thickness of the absorber 40 change with the inner end 41W of the first layer 41 and the outer end 42W of the second layer 42 as a boundary. In the present embodiment, the absorber bends with the outer end portion 42W of the second layer where the rigidity or the like changes as a boundary.

  Moreover, the top sheet 10 and the absorber back surface covering sheet 30 are bonded and fixed in the central opening 45, whereby the absorber can be bent without being out of shape.

(3) Shape change of absorber FIG. 7: is sectional drawing (X1-X'1 line reference | standard of FIG. 1) which shows the wearing condition of the disposable diaper 1 typically. When the disposable diaper 1 is worn, the urination region S3 of the absorber is applied to the wearer's crotch. A force is applied to the absorber from the outer side in the width direction toward the inner side in the width direction by the wearer's legs and the like. The absorber 40 bends with the central elastic member 44 and the central opening 45 and the first side slit 46 as the starting point, and the cross-sectional shape along the width direction W of the disposable diaper 1 is deformed into a wave shape. . Therefore, the urination region S3 of the absorber 40 is regularly folded.

  In the absorbent body 40, the top surface of the absorbent body 40, which is convex in the inward direction IN by the central elastic member 44, abuts the wearer's crotch portion. The portion where the convex portion is formed by the central curved portion is constituted only by the second layer 42 and is relatively thin. On the other hand, the first layer 41 and the second layer 42 overlap each other between the convex portion formed by the central curved portion and the convex portion formed by the first curved portion, so that the thickness is relatively thick and the rigidity is high. The convex portion by the central curved portion can be supported by the portion having high rigidity between the central curved portion and the first curved portion, and the stability of the convex shape by the central curved portion can be improved.

  Moreover, you may comprise so that the center groove | channel and slit extended in the front-back direction may be provided in the center part of a center curved part. By providing a central groove or slit extending in the front-rear direction at the central portion of the central curved portion, a concave portion recessed on the non-skin contact surface side is formed in the central portion in the width direction of the central curved portion that is convex on the skin contact surface side. It can also be provided. For example, by forming a slit at a position facing the central opening of the second layer, the absorber is not disposed in the portion where the slit is formed, so that the top sheet of the portion is deformed to bend toward the back sheet. Thus, it can be configured to bend outwardly.

  Moreover, when a wearer closes both legs, the cross-sectional shape of the disposable diaper 1 will be arrange | positioned compactly in the lower part of a crotch part in the state which the absorber was folded in the center curved part and the 1st curved part, and mutually adhered. .

  At this time, the central curved portion formed by the central elastic member 44 and the central opening 45 is positioned so as to contact the crotch portion of the wearer. On the other hand, the 1st music part formed by the 1st side slit 46 is convex in the non-skin contact surface side, and becomes a position which does not contact a wearer's excretion opening.

  Since the absorbent body is in close contact with the wearer's crotch region, leakage of bodily fluids can be prevented even when urine with a slow urine speed that is transmitted to the skin is discharged. Further, in the folded state, a dent extending in the front-rear direction is formed in the bent portion away from the skin of the absorber, so that the body fluid can be diffused outward in the front-rear direction, and side leakage is prevented. be able to.

  Since the central opening 45 and the first side slit 46 formed in the absorber are folded at the base point, the absorber 40 is formed as compared with the case where a thin portion is formed in the absorber 40 to form a convex portion. Even when the liquid 40 absorbs and swells, the absorber 40 is easily bent. Moreover, the cross-sectional shape when wearing the disposable diaper 1 and the absorber 40 deform | transforms is a taper shape which becomes narrow toward the skin contact surface side from the non-skin contact surface side. Therefore, it is easy to fit in a crevice between a wearer's crotch, and it is hard to give a sense of incongruity.

  Further, the convex portion formed by the central curved portion is constituted only by the second layer 42, and is thinner than the portion constituted by laminating the first layer 41 and the second layer 42. That is, since the convex portion formed by the central curved portion is thin and high in height, it is easy to be inserted into a narrow gap in the crotch portion, and to be in close contact with the excretion opening. Therefore, since the urination opening and the absorber are in close contact with each other, the excreted urine can be quickly absorbed. Moreover, in the part close | similar to the skin of a wearer's crotch part, since the thickness of an absorber is thin and it folds so that thickness may become thick in a part far from skin, it can be made to fit without discomfort.

  Due to the structure that easily penetrates into the narrow gap in the crotch part of the body, the distance between the central opening 45 and the urination part can be reduced. By reducing the distance between the central opening 45 and the urination part, the urinated urine can be diffused in the front-rear direction by the central opening 45 and guided to the absorbent sheet 90 in the rear waistline region S2. By smoothly guiding the body fluid to the absorbent sheet 90, the body fluid is preferentially concentrated on a portion having a high absorption capacity, and the absorption performance can be further enhanced by using the absorption capacity more effectively.

  As a manufacturing method of the absorbent article comprised in this way, for example, a step of molding the first layer of the absorber, a step of molding the second layer of the absorber, and the first layer and the second layer An absorbent article can be manufactured by a method including a step of combining, and a step of transporting an absorber or the like with a belt conveyor or the like and joining with a sheet material such as an absorbent sheet or a surface sheet in the process of transporting. The other steps can be manufactured according to known manufacturing methods.

  In addition, when an opening or a side slit is provided in both the first layer and the second layer, a positional shift may occur when the first layer and the second layer are overlapped. For example, if a displacement occurs in the width direction, the width of the pair of side slits arranged on the left and right becomes narrow, and regular deformation becomes impossible, or the left and right unbalanced absorber becomes an adverse effect on the absorbability and wearing feeling. There is a risk of causing However, by providing an opening or a side slit in either one of the first layer and the second layer, it is possible to prevent positional deviation of the side slit and the like.

(Disposable diaper according to Modification 1)
Subsequently, the structure of the absorber of the disposable diaper which concerns on a modification is demonstrated, referring drawings. In addition, about the structure similar to embodiment mentioned above, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  FIG. 8A and FIG. 8B show an absorber according to the first modification. FIG. 8A is a plan view, and FIG. 8B is a cross-sectional view taken along the front-rear direction at the center in the width direction.

The absorber 40G according to the first modification is configured by a substantially hourglass-shaped single layer. The absorber 40G includes a first region R1 having an absorbent polymer and a second region R2 having a lower basis weight of the absorbent polymer than the first region R1. In FIG. 8, the first region is indicated by hatching. The area | region around the 1st area | region in an absorber becomes a 2nd area | region. 1st area | region is comprised by arrange | positioning an absorptive polymer intermittently, and is arrange | positioned at the non-skin contact surface side of the back waistline area | region S2 contact | abutted to a buttocks.
In addition, the 2nd area | region should just be comprised so that the fabric weight of an absorptive polymer is lower than the 1st area | region, and an area | region which does not have an absorptive polymer (absorbent polymer basis weight is 0 g / m < ² >) may be sufficient. .

  FIG.8 (c) and FIG.8 (d) have shown the absorber 40H which concerns on the modification 2. FIG. FIG.8 (c) is a top view, Comprising: FIG.8 (d) is sectional drawing of the cross section along the front-back direction in the center of the width direction.

  The absorber 40H according to the modification 2 is configured by a substantially hourglass-shaped single layer. 1st area | region is comprised by arrange | positioning the high absorptive core whose absorptive polymer is higher than the surrounding absorber, and is on the skin contact surface side of the back waistline area | region S2 contact | abutted to a buttocks. Is arranged.

  The rear end of the central opening of the absorber overlaps the first region in the thickness direction. Thus, by arranging the guide portion and the first region so as to overlap each other, the body fluid absorbed in the urination region S3 can be directly guided to the first region. Therefore, body fluid can be transferred to the first region quickly and reliably, and the use efficiency of the absorbent polymer disposed in the first region can be increased.

  Moreover, since the 1st area | region is arrange | positioned at the non-skin contact surface side of the center opening part of an absorber, the bodily fluid guided by the center opening part is absorbed from the non-skin surface side of a 1st area | region. Therefore, it becomes difficult for the body fluid to adhere to the skin, and the wet feeling can be reduced.

  FIG.8 (e) and FIG.8 (f) have shown the absorber 40J which concerns on the modification 3. FIG. FIG. 8E is a plan view, and FIG. 8F is a cross-sectional view of the cross section along the front-rear direction at the center in the width direction.

  The absorber 40J according to Modification 3 is configured by a substantially hourglass-shaped single layer. The first region is formed by increasing the basis weight of the absorbent polymer in a part of the absorbent body, and is disposed in the rear waistline region S2 that abuts on the buttocks.

  FIG. 8G and FIG. 8H show an absorber 40K according to Modification 4. FIG. 8G is a plan view, and FIG. 8H is a cross-sectional view of the cross section along the front-rear direction at the center in the width direction.

  The absorber 40K according to the modified example 4 is configured by a substantially hourglass-shaped single layer. The 1st field is constituted by arranging an absorptive polymer intermittently. In the absorber, a low weight area 47 that functions as a guide part and a curved part is formed along the front-rear direction.

  FIG. 9 is a plan view of a disposable diaper according to a modification. In this disposable diaper, the inner end in the width direction of the leg-hole elastic material extends to the center in the width direction, and the left and right leg-hole elastic materials are connected. This continuous elastic material functions as a width elastic member that expands and contracts in the width direction.

  The leg leg elastic material for the left leg and the leg leg elastic material for the right leg are continuously arranged, so that the leg leg elastic members can be pulled up in conjunction with each other, and the rear waist area can be pulled up efficiently. Can do.

  In such a configuration, there is a possibility that wrinkles may enter the absorbent body due to the shrinkage of the leg-stretchable members and the absorption performance may be deteriorated. However, in the present embodiment, since the rigidity is increased due to the presence of the first region, the absorbent body is less likely to be wrinkled. Since the first region has a large amount of absorbent polymer, the rigidity is further increased after liquid absorption. Therefore, wrinkles are less likely to enter the absorber, and deterioration of absorption performance can be suppressed.

[Other Embodiments]
Although the contents of the present invention have been disclosed through the embodiments of the present invention as described above, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples, and operational techniques will be apparent to those skilled in the art.

  For example, in the above-described embodiment, the pants-type disposable diaper has been described. However, the present invention is not limited thereto, and may be applied to an open-type disposable diaper, an incontinence pad, a sanitary napkin, and the like. Good.

  In the above-described embodiment, the absorber is configured to bend using the slit, the elastic material, or the boundary portion where the rigidity changes, but by reducing the thickness of the absorber or embossing the absorber. You may comprise so that an absorber may bend.

  Moreover, although the absorbent article which concerns on this Embodiment is provided with the side edge part elastic material 49, it does not need to be provided with the side edge part elastic material 49. FIG. Further, the leak-proof wall has a standing part (leak-proof elastic material 53) in order to prevent side leakage from the crotch, but it does not necessarily have to have the leak-proof elastic material 53.

  In the present embodiment, the absorber 40 has a two-layer structure of the first layer 41 and the second layer 42, but the absorber 40 of the wearing article according to the present invention may be configured by only one layer. And it may be composed of three or more layers.

  Further, in the present embodiment, the central music part and the first music part are provided, but a plurality of music parts such as the second music part and the third music part are provided outside the first music part in the width direction. It may be provided.

  Further, in Modification 3, as an example of the first region, an example in which the basis weight of the absorbent polymer in a part of the absorber of one layer is increased is shown, but as shown in FIG. Even if the absorbent polymer is arranged on the upper side in the central portion in the width direction, the absorbent polymer is arranged in almost the entire width in the width direction, or the absorbent polymer is scattered on the surface side of the absorber in the cross section of the absorber. Good.

  As described above, the present invention naturally includes various embodiments that are not described herein. Accordingly, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

  DESCRIPTION OF SYMBOLS 1 ... Disposable diaper (disposable wearing article), 3 ... Waist gather, 3A ... Waist elastic material, 4, 4 '... Front waistline side edge, 5 ... Leg gather, 5F ... Front leg circumference elastic material, 5R ... Rear leg circumference Elastic material 6, 6 '... Rear waistline edge, 8 ... Middle crotch edge, 10 ... Top sheet, 15 ... Second sheet, 30 ... Absorber back coating sheet, 40, 40G, 40H, 40J, 40K ... Absorber 41 ... first layer, 41W ... inner end, 42 ... second layer, 42W ... outer end, 43 ... elastic material covering sheet, 44 ... central elastic member, 45 ... central opening, 46 ... first side slit 47 ... Low-weight area, 49 ... Side end elastic material, 53 ... Leak-proof elastic material, 60 ... Side sheet, 70F ... Front exterior topsheet, 70R ... Rear exterior topsheet, 80F ... Front exterior back Sheet, 80R: Rear exterior backsheet, 90 ... Absorbent sheet, 92, 93 ... Liquid permeable sheet, 96 ... Absorbent polymer placement region, 97 ... Absorbent polymer non-placement region, 100 ... Exterior center sheet, 110 ... Intermediate region, R1 ... first region, R2 ... second region, S1 ... front waistline region, S2 ... rear waistline region, S3 ... urination region

Claims (7)

A liquid-permeable top sheet, a back sheet, a front-rear direction that is disposed between the front sheet and the back sheet, and extends in the front and rear sides of the wearer and a width direction perpendicular to the front-rear direction An urination area that is an area that comes into contact with the urination part of the wearer, and a buttock area that is an area that is arranged behind the urination area and comes into contact with the buttock of the wearer. A disposable wearing article provided with an absorbent sheet having an absorbent polymer sandwiched between liquid-permeable sheets between the top sheet and the back sheet,
In the urination region, the absorbent sheet is not disposed,
In the buttocks region, the absorbent sheet is disposed,
The absorbent located in at least the urination region of the urination region and the buttock region extends from the urination region toward the buttock region, and the absorbent sheet is sandwiched with the absorbent polymer. provided guide portions you terminate in front than the polymer arrangement region, wherein the guide portion and the absorbent polymer area is provided apart from each other in the longitudinal direction,
The disposable wearing article, wherein a collar stretchable member that stretches in at least the longitudinal direction of the longitudinal direction and the width direction is provided in the collar region. A liquid-permeable top sheet, a back sheet, a front-rear direction that is disposed between the front sheet and the back sheet, and extends in the front and rear sides of the wearer and a width direction perpendicular to the front-rear direction An urination area that is an area that comes into contact with the urination part of the wearer, and a buttock area that is an area that is arranged behind the urination area and comes into contact with the buttock of the wearer. A disposable wearing article comprising:
The absorber has a first region having an absorbent polymer, and a second region having a lower basis weight of the absorbent polymer than the first region,
The absorber in the buttocks region is provided with the first region,
The absorber in the urination region is provided with the second region,
The absorbent polymer in the first region in which the absorbent polymer located at least in the urination region of the urination region and the buttock region extends from the urination region toward the buttock region and the absorbent polymer is disposed. arrangement area guide portion you terminate forward is provided than the the guide portion and the absorbent polymer area is provided apart from each other in the longitudinal direction,
The disposable wearing article, wherein a collar stretchable member that stretches in at least the longitudinal direction of the longitudinal direction and the width direction is provided in the collar region.   The said guide part is comprised by at least any one among the slit formed in the said absorber, and the low fabric weight area | region which is a fabric weight lower than the surrounding fabric weight in the said absorber. The disposable wearing article as described.   The disposable wearing article according to any one of claims 1 to 3, wherein the buttocks elastic member is a pair of leg elastic members arranged along the legs of the wearer.   The disposable wearing article of Claim 4 provided with the width | variety elastic member which is arrange | positioned ranging over a pair of said leg periphery elastic | stretch member, and expands-contracts in the said width direction.   The disposable wearing article according to any one of claims 1 to 5, wherein the hip region is provided with a waist elastic material arranged along the waist of the wearer and extending and contracting in the width direction. . Oite the buttock region, the absorbent polymer area of multiple is intermittently provided in the longitudinal direction, between each absorbent polymer areas arranged in the longitudinal direction, the absorbent polymer is disposed The disposable wearing article according to any one of claims 1 to 6, wherein a non- absorbable polymer non-arranged region is disposed.

Images