JP2018196574A - Absorbent article - Google Patents

Abstract

To provide an absorbent article capable of efficiently releasing outside steam stuffed inside the absorbent article.SOLUTION: An absorbent article has: an absorber placed from a front body across to a rear body; an inner sheet; an outer sheet; a cushion formation sheet; and a plurality of waist stretchable members fixed in a width direction closer to a skin non-facing surface side than the cushion formation sheet. At least the inner sheet and the cushion formation sheet are bonded at bonding parts so that the bonding parts formed by linear-shaped bonding lines extending in a longitudinal direction and non-bonding parts are formed by turns. In crotch part side end part areas of the respective non-bonding parts of the cushion formation sheet, at least one open hole is provided.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an absorbent article.

  Absorbent articles such as disposable diapers absorb excretory fluids such as urine with an absorber. There are various types of disposable diapers. For example, a pants-type disposable diaper and a tape-type disposable diaper are known. A pants-type disposable diaper is a disposable diaper of a type in which both sides of a front body and a back body are joined in advance. The tape-type disposable diaper is a type of disposable diaper in which a joining tape is attached to both sides of the front body or the back body, and the front body and the back body are bonded using the joining tape when worn.

  In a pants-type disposable diaper, a plurality of elastic members are generally fixed in an expanded state around the periphery of a waist opening formed by bonding a front body and a back body. These elastic members can be worn without the diaper slipping down by tightening around the waist of the wearer. If tightening around the waist of the diaper is strengthened, there is a merit that adhesion between the periphery of the waist opening and the wearer's waist is increased, but there is also a demerit that air permeability is deteriorated.

  For example, in Patent Document 1, a plurality of cylindrical portions (flute structure) are formed in a peripheral member of a waist opening of a disposable diaper, and a plurality of apertures are provided in an outermost layer sheet member constituting the cylindrical portion. Disposable diapers having intermittently formed stretchable sheets are disclosed. Here, a plurality of apertures are provided in a row along the convex portions of the sheet member constituting the cylindrical portion. Patent Document 2 discloses a disposable diaper in which a plurality of holes are formed in an outermost layer sheet member (cushion forming sheet) having a flute structure. Here, it arrange | positions so that an opening may incline a predetermined angle with respect to the longitudinal direction of a disposable diaper.

JP 2011-078377 A JP, 2006-043248, A

  Conventionally, in an absorbent article such as a disposable diaper, steam is likely to be trapped inside the absorbent article, and when the wearer wears such a state for a long time, skin problems such as diaper rash occur. It has become. For this reason, development of the absorbent article which can escape the vapor | steam accumulated inside the absorbent article efficiently outside is calculated | required. However, as in the prior art, in absorbent articles such as disposable diapers in which a large number of apertures are provided in the sheet member, there is a problem that it is difficult to efficiently escape the vapor trapped inside the absorbent article to the outside. .

  Therefore, in order to solve such problems of the prior art, the present inventors have proceeded with studies for the purpose of providing an absorbent article that can efficiently release the vapor trapped inside the absorbent article to the outside. It was.

As a result of earnest studies to solve the above problems, the present inventors have found that the absorbent body, the inner sheet, the cushion-forming sheet disposed on the skin-facing surface side than the inner sheet, and the inner sheet In an absorbent article having an outer sheet disposed on the skin non-facing surface side, by forming an opening in a predetermined portion of the cushion forming sheet, the steam trapped inside the absorbent article is efficiently released to the outside. It has been found that an absorbent article can be obtained.
Specifically, the present invention has the following configuration.

[1] It has a longitudinal direction and a width direction orthogonal to the longitudinal direction,
The front body, the back body, and the crotch located between the front body and the back body are divided in the longitudinal direction,
An absorber disposed from the front body to the back body;
An inner sheet,
An outer sheet disposed on the skin non-facing surface side than the inner sheet;
A cushion forming sheet arranged on the skin facing surface side than the inner sheet;
A plurality of waist stretchable members fixed along the width direction on the skin non-facing surface side than the cushion-forming sheet, and an absorbent article,
At least the inner sheet and the cushion-forming sheet are joined at the joint so that joints formed by linear joint lines extending along the longitudinal direction and non-joints are alternately formed,
An absorbent article in which at least one opening is provided in a crotch side end region of each non-joined portion of the cushion-forming sheet.
[2] Each of the joint portions is formed by arranging linear joint lines extending in the longitudinal direction in two rows,
The absorbent article according to [1], wherein an interval between the non-joining portions formed between the joining portions is wider than a spacing between the rows of joining lines in the joining portion.
[3] The absorbent article according to [1] or [2], wherein the air permeability of the cushion forming sheet is higher than the air permeability of the inner sheet.
[4] The absorbent article according to any one of [1] to [3], wherein the area of the aperture is 0.01 to ⁵ cm ² .

  ADVANTAGE OF THE INVENTION According to this invention, the absorbent article which can escape to the exterior efficiently the vapor | steam trapped inside the absorbent article can be obtained.

FIG. 1 is an external perspective view of a disposable diaper according to an embodiment of the present invention. FIG. 2 is a developed plan view of a disposable diaper according to an embodiment of the present invention. 3 is a cross-sectional view taken along line YY shown in FIG. FIG. 4 is a diagram schematically showing a cross-sectional state in the thickness direction of the waist opening. FIG. 5 is a diagram for explaining an example of the form of the joined portion and the non-joined portion.

  Hereinafter, the present invention will be described in detail. The description of the constituent elements described below may be made based on representative embodiments and specific examples, but the present invention is not limited to such embodiments.

In the present specification, the “longitudinal direction” means a direction in the absorbent article that connects the front body located on the wearer's abdomen side and the back body located on the wearer's back side. The “width direction” means a direction perpendicular to the longitudinal direction of the absorbent article.
Moreover, in this specification, a "skin opposing surface" means the surface which opposes a wearer's skin at the time of wear of an absorbent article. The “non-skin facing surface” means a surface that does not face the wearer's skin when the absorbent article is worn. In the present specification, “A to B” means “A or more and B or less”.

(Absorbent article)
The present invention has a longitudinal direction and a width direction orthogonal to the longitudinal direction, and is divided in the longitudinal direction into a front body, a back body, and a crotch portion located between the front body and the back body, An absorber disposed from around to the back body, an inner sheet, an outer sheet disposed on the skin non-facing surface side than the inner sheet, and a cushion forming sheet disposed on the skin facing surface side from the inner sheet; It is related with the absorptive article which has a plurality of waist elastic members currently fixed along the width direction by the skin non-opposing surface side rather than a cushion formation sheet. In the absorbent article, at least the inner sheet and the cushion-forming sheet are bonded at the bonding portion so that the bonding portion formed by the linear bonding line extending along the longitudinal direction and the non-bonding portion are alternately formed. Has been. And at least 1 opening part is provided in the crotch part side edge part area | region of each non-joining part of a cushion formation sheet.

  Since the absorbent article of the present invention has the above-described configuration, the vapor trapped inside the absorbent article can be efficiently released to the outside. Specifically, in the absorbent article of the present invention, at least one hole is provided in the crotch side end region of each non-joined portion of the cushion-forming sheet, thereby confining the absorbent article. Steam can be taken in efficiently from the opening. Since the vapor inside the absorbent article is particularly likely to be trapped in the crotch side area, by providing an opening in the crotch side end area of each non-joint part of the cushion-forming sheet, the steam trapped inside the absorbent article Can be easily taken in from the opening. And the vapor | steam taken in from the opening part is discharge | released outside through the ventilation path (tubular part) formed between the cushion formation sheet | seat and the inner sheet | seat. Thereby, it is possible to eliminate the accumulation of steam inside the absorbent article of the present invention.

  In addition, in this specification, the crotch part side edge part area | region of each non-joining part of a cushion formation sheet is a non-joining part toward a longitudinal direction outer side from the crotch part side edge of the non-joining part of a cushion formation sheet. An area up to 30% of the total length in the longitudinal direction. That is, when the length in the longitudinal direction of the non-joined portion of the cushion-forming sheet is Amm, the length in the longitudinal direction of the crotch side end region of each non-joined portion of the cushion-forming sheet is 0.3 × Amm. . In FIG. 2, the crotch side end region of the non-joined portion is a region represented by a range of D.

The form of the absorbent article of the present invention is not particularly limited. Examples of the absorbent article include disposable diapers and sanitary napkins. Disposable diapers are roughly classified into pants-type disposable diapers and tape-type disposable diapers. The pants-type disposable diaper is a disposable diaper having a structure in which both sides of a front body and a back body are joined in advance. The pants-type disposable diaper may be a cross-linked type having a configuration in which the absorbent main body cross-links between the front body exterior body and the back body exterior body formed separately. Moreover, the pants-type disposable diaper is an integral type in which the absorbent body is fixed around the crotch part to an exterior body that is integrally formed by hanging from the front part through the crotch part to the back part. Also good. The tape-type disposable diaper is a disposable diaper in which a joining tape is attached to both sides of the front body or the back body, and the front body and the back body are joined using the joining tape when worn.
Below, among these various types of absorbent articles, a pants-type disposable diaper is taken as an example to specifically describe the contents of the present invention.

(Pant-type disposable diaper structure)
FIG. 1 is a perspective view showing an example of an absorbent article 100 (hereinafter also referred to as a disposable diaper or a diaper) viewed from the front body side. FIG. 2 is a development view showing an example of a disposable diaper. FIG. 2 shows a state in which the disposable diaper is viewed from the skin facing surface side.

  As shown in FIGS. 1 and 2, the disposable diaper includes a front body 1 that contacts the abdomen of the wearer, a back body 2 that contacts the back of the wearer, and a crotch that is applied to the inseam of the wearer. Part 3. In the disposable diaper of the present embodiment, the front body 1 is configured by the front body exterior body 10, and the back body 2 is configured by the back body exterior body 20. The absorber main body 30 is cross-linked to the crotch 3 between the front body exterior body 10 and the back body exterior body 20. That is, one end of the absorber main body 30 is fixed to the front body exterior body 10, and the other end of the absorber main body 30 is fixed to the back body exterior body 20. For example, a hot melt adhesive or the like is used for fixing each exterior body and the absorber main body 30.

  2 is assembled into the state shown in FIG. 1 by joining both end portions in the width direction of the front body exterior body 10 and the back body exterior body 20 from the developed state shown in FIG. As shown in FIG. 1, the waist opening 4 is formed by the upper end edge of the front body exterior body 10 and the upper end edge of the rear body exterior body 20. Moreover, the leg opening part 5 located around a wearer's leg part at the time of mounting | wearing is formed by joining the both ends of the front body exterior body 10 and the back body exterior body 20 mutually.

<Exterior body>
As shown in FIGS. 1 and 2, in the present embodiment, the front body exterior body 10 and the back body exterior body 20 are respectively disposed on the skin non-facing surface side of the inner sheet 41 and the inner sheet 41. It has the sheet | seat 42 and the cushion formation sheet 44 distribute | arranged to the skin opposing surface side rather than the inner side sheet | seat 41. FIG. The inner sheet 41 and the cushion forming sheet 44 are disposed so as to extend in the width direction along the edge that forms the waist opening 4. Here, the inner sheet 41 is a sheet that is at least partially disposed on the skin facing surface side of the absorber, and the outer sheet 42 is a sheet that is entirely disposed on the skin non-facing surface side of the absorber. Say. Further, the cushion forming sheet 44 is a sheet provided on the outermost layer, and is disposed on the skin facing surface side with respect to the inner sheet 41. Each of the inner sheet 41 and the outer sheet 42 may be composed of two or more sheets. In addition, in this specification, the location where the cushion formation sheet 44 is arranged may be called a cushion part.

The cushion portion includes a plurality of waist elastic members 43. The plurality of waist elastic members 43 are fixed along the width direction on the skin non-facing surface side of the cushion forming sheet 44,
The waist opening 4 extends in the width direction of the disposable diaper along the end portion of the front body exterior body 10 and the end portion of the rear body exterior body 20. The plurality of waist elastic members 43 are arranged at predetermined intervals in the longitudinal direction of the disposable diaper. The plurality of waist elastic members 43 are fixed in an extended state, and a waist gather is formed in the vicinity of the waist opening 4 by contracting the plurality of waist elastic members 43.

  The plurality of waist stretchable members 43 may be fixed along the width direction on the skin non-facing surface side with respect to the cushion forming sheet 44. For example, the plurality of waist elastic members 43 may be fixed between the inner sheet 41 and the outer sheet 42, or may be fixed between the inner sheet 41 and the cushion forming sheet 44. Further, when there are a plurality of inner sheets 41 and outer sheets 42, the plurality of waist elastic members 43 may be fixed between the inner sheets 41, and are fixed between the outer sheets 42. It may be.

  The plurality of waist elastic members 43 are fixed between the sheets in a state of extending along the width direction. At that time, the entire waist elastic member 43 may be fixed between the sheets, but only a part of the waist elastic member 43 is fixed between the sheets. It does not have to be fixed to each sheet. By fixing only a part of the waist elastic member 43, the waist region can be easily moved in accordance with the movement of the body, and the fit at the time of wearing can be improved. Further, by fixing only a part of the waist elastic member 43, it is possible to make the absorbent body less likely to be twisted or wrinkled.

  FIG. 3 shows a cross-sectional view taken along line YY shown in FIG. As shown in FIG. 3, the front body exterior body 10 and the back body exterior body 20 are configured to include an outer sheet 42, an inner sheet 41, and a cushion forming sheet 44. The outer sheet 42, the inner sheet 41, and the cushion forming sheet 44 together form an edge in the longitudinal direction of the disposable diaper. That is, the outer sheet 42, the inner sheet 41, and the cushion forming sheet 44 form an edge along the waist opening 4 of the disposable diaper. In the example shown in FIG. 3, the inner sheet 41 and the outer sheet 42 are separated from each other, but the inner sheet 41 and the outer sheet 42 may be connected and integrally formed. That is, one sheet member may be folded back at the waist edge, and the portion facing the skin facing surface may be the inner sheet 41 and the portion facing the skin non-facing surface may be the outer sheet 42.

  The stretch ratio when the plurality of waist elastic members 43 are fixed can be, for example, 150 to 400%, preferably 200 to 380%, and more preferably 250 to 360%. The “stretch rate” is a value indicating the ratio of the length of the stretchable member in the stretched state when the length (original size) of the stretchable member in the non-stretched state (free state) is 100%. is there. Thus, the waist elastic member 43 in the stretched state is fixed between the sheets, so that when the waist elastic member 43 contracts, a heel (waist gather) is formed in the vicinity of the waist opening 4.

  When the waist elastic member 43 is sandwiched and fixed between the sheets, for example, an adhesive is applied to the waist elastic member 43 itself, and the waist elastic member 43 to which the adhesive is applied is sandwiched between the sheets. That's fine. At this time, an adhesive may be applied only to a part of the waist elastic member 43. In such a case, it is preferable to apply an adhesive to both end portions of the waist elastic member 43. Moreover, after apply | coating an adhesive agent to the sheet | seat which pinches | interposes the waist elastic member 43, either can also be fixed by inserting the waist elastic member 43 between these sheets.

  As the waist elastic member 43, it is preferable to apply a thread-like elastic rubber material or a belt-like elastic rubber material. As such a rubber material, materials such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicone, or polyester can be used.

  The cushion forming sheet 44 is a sheet member that directly touches the skin of the wearer of the disposable diaper, and has a function of forming a gather on the skin facing surface side of the inner sheet 41. The cushion forming sheet 44 forms gathers on the skin facing surface side of the inner sheet 41, thereby forming a plurality of cylindrical air passages (flute structures) between the cushion forming sheet 44 and the inner sheet 41. The

  In FIG. 4, the outer sheet 42, the waist elastic member 43, the inner sheet 41, and the cushion forming sheet 44 are stacked in order from the lower side (skin non-contact surface side) of the drawing. A sectional view in the thickness direction in a state in which a plurality of cylindrical air passages are formed between the sheets 41 is shown. FIG. 4 shows a state after the waist stretchable member 43 is contracted after being stretched along the width direction and then contracted. As the waist stretchable member 43 contracts, the cushion forming sheet 44 is wrinkled. Is formed. That is, when the waist elastic member 43 contracts, the cushion forming sheet 44 is separated from the inner sheet 41 at the non-joint portion 52, and a plurality of ventilation paths (spaces) 70 are provided between the cushion forming sheet 44 and the inner sheet 41. Is formed. Such a structure is referred to as a “flute structure” in this specification. Since such an air passage 70 communicates with the outside of the diaper, it serves as a passage for the steam taken in from the opening 50 and serves to release the steam inside the diaper to the outside of the diaper. Also, air can be introduced into the inside through the ventilation path 70. Furthermore, by forming such a flute structure, flexibility and cushioning properties can be imparted to the skin facing surface of the waist opening.

  As shown in FIGS. 2 and 4, at least the inner sheet 41 and the cushion forming sheet 44 have alternately joined portions 51 formed by linear joining lines extending along the longitudinal direction and non-joining portions 52. It joins by the junction part 51 so that it may be formed. That is, the joint part 51 is intermittently formed along the width direction of the diaper. In the joining part 51, it is good also as joining the cushion formation sheet 44 and the inner sheet | seat 41 with a hot-melt-adhesive etc., Even if it fuse | fuses the cushion formation sheet 44 and the inner sheet | seat 41 with a heat seal or an ultrasonic seal | sticker. Good. The shape of the joint portion 51 may be a straight joint line, and the straight joint line includes a joint line intermittently formed in the longitudinal direction, and the straight joint line is a perforation line. May be. In addition, as a joining mode of the cushion forming sheet 44 and the inner sheet 41, a known joining mode can be appropriately employed.

  It is preferable that at least a part of the outer sheet 42 is bonded to the inner sheet 41. For example, the cushion forming sheet 44, the inner sheet 41, and the outer sheet 42 may be joined together at the joining portion 51. Further, a joint part may be provided separately from the joint part 51 between the cushion forming sheet 44 and the inner sheet 41, and the inner sheet 41 and the outer sheet 42 may be joined.

  In this embodiment, as FIG. 3 shows, the inner side sheet | seat 41 and the cushion formation sheet | seat 44 are extended in the direction of the crotch part 3 of a diaper. And it is preferable that at least one part of the inner side sheet | seat 41 and the cushion formation sheet 44 has overlapped on the skin opposing surface side of the absorber 31. FIG. By superposing a part of the inner sheet 41 and the cushion forming sheet 44 on the absorber main body 30, the absorber main body 30 is firmly fixed to the front body exterior body 10 and the back body exterior body 20, and is difficult to come off.

  Each non-joining portion 52 of the cushion forming sheet 44 is provided with at least one opening portion 50. Such an opening 50 is provided in the crotch side end region of the non-joined portion of the cushion forming sheet 44. By providing the opening portion 50 in the crotch lower end region of the non-joint portion of the cushion forming sheet 44, the vapor trapped inside the diaper is easily taken in from the opening portion 50, and the taken-in vapor passes through the air passage 70. It is discharged to the outside of the diaper through. Thereby, it can suppress that a vapor | steam accumulates inside a diaper. Note that at least a part of the opening 50 may be superimposed on the absorber 31 or may not be superimposed on the absorber 31. FIG. 3 shows an example in which the opening 50 is not superimposed on the absorber 31.

  In this specification, the opening part 50 means the through-hole formed so that the sheet | seat member might penetrate completely. The number of the opening portions 50 provided in each non-joined portion is preferably 3 or less, more preferably 2 or less, and particularly preferably 1. By setting the number of the opening portions within the above range, the steam taken in by the opening portion 50 can be discharged to the outside of the diaper without escaping in the middle of the air passage 70.

  When at least a part of the aperture 50 overlaps the absorber 31, the aperture 50 preferably overlaps the longitudinal end region of the absorber 31. Here, the longitudinal direction end region is a region existing at the end in the longitudinal direction (Y direction), and such a longitudinal direction end region is provided along the width direction (X direction). In the present specification, the longitudinal end region of the absorbent body 31 refers to a region from the longitudinal edge of the absorbent body 31 to a distance of 15% of the full length of the absorbent body inward in the longitudinal direction. That is, when the total length of the absorber 31 is Lmm, the longitudinal length of the longitudinal end region of the absorber 31 is 0.15 × Lmm, and such regions are provided at both ends of the absorber 31. ing.

  The opening 50 is preferably provided in the end region of the air passage 70. That is, the opening 50 is preferably provided in the cushion forming sheet 44 that constitutes the end region of the ventilation path 70. The length in the longitudinal direction of the air passage 70 is determined by the length in the longitudinal direction of the joint portion 51, and is the same as the longitudinal direction of the joint portion 51 extending to the crotch side end region. In addition, when at least a part of the opening portion 50 overlaps with the absorber 31, the air passage 70 also overlaps with the absorber 31, and the joint portion 51 also overlaps with the absorber 31. In this case, it is preferable that only the inner sheet 41 and the cushion forming sheet 44 are bonded in the bonding portion 51 that overlaps the absorber 31, and it is preferable that both the outer sheets 42 are not bonded.

Area of the opening portion 50 is preferably 0.01～5Cm ^2, more preferably 0.02~1cm ^2. The shape of the opening 50 may be a circle or an ellipse, or may be a triangle, a quadrangle, a pentagon, a hexagon, or other polygons.

  When the interval in the width direction of the opening portion 50 is W and the interval in the width direction of the joint portion 51 (the width of the non-joint portion 52) is S, it is preferable that W <S. For example, the interval (W) between the opening portions 50 is preferably 50% or more, more preferably 60% or more, and 70% or more with respect to the interval (S) in the width direction of the joint portion 51. More preferably, it is particularly preferably 80% or more. Further, the interval (W) between the opening portions 50 is preferably 99% or less, and more preferably 95% or less with respect to the interval (S) in the width direction of the joint portion 51. Thereby, the vapor | steam accumulated in the inside of a diaper can be taken in efficiently.

  The joint portions 51 may be formed by linearly joining lines extending along the longitudinal direction in a line, and linear joining lines extending along the longitudinal direction are aligned in two lines. It may be formed by. FIG. 5 is an enlarged view of the vicinity of the waist opening 4 having the joint portion 51 and the non-joint portion 52, and shows the joint lines of the joint portions 51 formed in two rows. As shown in FIG. 5, a region sandwiched between two rows of joint lines is referred to as a joint portion 51, and a region sandwiched between the joint portions 51 is referred to as a non-joint portion 52. And the opening part 50 is formed in the non-joining part 52. Here, it is a case where the joining line of each joining part 51 is formed in 2 rows, Comprising: The space | interval (width | variety of the joining part 51) between the rows of the joining line in the joining part 51 is set to T. When S is the interval in the width direction of the joint portion 51 (the width of the non-joint portion 52), S> T. Note that S> 2 × T is preferable, S> 3 × T is more preferable, and S> 4 × T is more preferable.

  When forming the opening 50 in the inner sheet 41, the opening 50 can be formed using a known punching type opening device.

  The inner sheet 41, the outer sheet 42, and the cushion forming sheet 44 are preferably nonwoven fabrics. As a nonwoven fabric, it is preferable to use what was manufactured, for example by the spun bond method, the air through method, and the airlaid method.

  The air permeability of the cushion forming sheet 44 is preferably higher than the air permeability of the inner sheet 41. By increasing the air permeability of the cushion forming sheet 44, it is possible to make it easier to take in the steam trapped inside the diaper. In addition, by reducing the air permeability of the inner sheet 41, it is possible to prevent the steam from leaking out to the outer sheet side in the air passage 70, and more effectively the steam trapped inside the diaper to the outside. Can be released.

  The density of the inner sheet 41 is preferably larger than the density of the cushion forming sheet 44. By reducing the density of the cushion forming sheet 44, it is possible to make it easier to take in the steam trapped inside the diaper. Further, by increasing the density of the inner sheet 41, it is possible to prevent the steam from leaking to the outer sheet side in the middle of the air passage 70, and more effectively release the steam trapped inside the diaper to the outside. be able to.

  The front body exterior body 10 and the back body exterior body 20 may be configured to further include an inner sheet 45 and a tammy stretchable member 46. As shown in FIG. 3, in the present embodiment, the outer sheet 42 extends in the direction of the crotch part 3, and a part of the outer sheet 42 is located on the skin non-facing surface side of the absorbent body 30. Here, the inner sheet 45 may be disposed on the skin facing surface side of the extending portion of the outer sheet 42. One or a plurality of waist elastic members 43 and / or tammy elastic members 46 may be sandwiched and fixed between the extended portion of the outer sheet 42 and the inner sheet 45. Similar to the waist elastic member 43, the tammy elastic member 46 is fixed between the extended portion of the outer sheet 42 and the inner sheet 45 in an extended state along the width direction of the diaper. The tammy expansion / contraction member 46 is an expansion / contraction member provided closer to the crotch 3 than the waist expansion / contraction member 43. In the present specification, the elastic member provided closer to the waist edge than the opening 50 is referred to as a waist elastic member 43, and the elastic member provided closer to the crotch than the opening 50 is referred to as a Tammy elastic member. .

  In the present embodiment, the Tammy stretchable member 46 may be cut (cut) at the center in the width direction. Cutting the elastic member like the Tammy elastic member 46 is a method called Tammy cut. When the tammy expansion / contraction member 46 is disposed, like the waist expansion / contraction member 43, the tammy expansion / contraction member 46 is fixed between the extended portion of the outer sheet 42 and the inner sheet 45 in an extended state along the width direction of the diaper. And after fixing, it cuts in the midpoint of the width direction of the Tammy expansion-contraction member 46. FIG. By giving such a tammy cut, it can be set as the structure which does not tighten an abdomen too much. In addition, since the tammy stretch member 46 to which the tammy cut is applied is partially contracted, the tammy stretch member 46 is stretched in the center region in the width direction of the front body exterior body 10 and the back body exterior body 20. Absent.

<Absorber body>
The absorbent main body 30 is held in a state of being bridged between the front body exterior body 10 and the back body exterior body 20, and is located in the crotch portion of the wearer when the disposable diaper is worn, such as urine excreted by the wearer. To absorb and hold liquid. As shown in FIG. 3, the absorber main body 30 preferably includes an absorber 31, a top sheet 32, a back sheet 33, and a cover sheet 34.

  The absorber 31 is a member for absorbing a liquid such as urine and holding the absorbed liquid. The absorber 31 is disposed between the liquid-permeable top sheet 32 and the liquid-impermeable back sheet 33. The absorber 31 has a function of absorbing the liquid that has passed through the top sheet 32 and is made of an absorbent material. A well-known material can be employ | adopted for the absorptive material which comprises the absorber 31. FIG. As an absorptive material, it is good also as using a flap pulp, a superabsorbent polymer, or a hydrophilic sheet, for example. The absorber 31 is preferably encapsulated by the core wrap sheet 36. As the core wrap sheet 36, tissue paper, absorbent paper, a nonwoven fabric subjected to hydrophilic treatment, or the like can be used as appropriate.

  The absorber 31 may have a rectangular outer shape, or may have a shape (so-called hourglass shape) in which the central portion in the longitudinal direction is constricted as shown in FIG.

  The thickness of the absorber 31 may be substantially uniform in both the longitudinal direction and the width direction, but the average thickness of both or one of the longitudinal end regions is the average thickness of the central region of the absorber. It may be thinner. In addition, the longitudinal direction edge part area | region of the absorber 31 says the area | region from the edge of the longitudinal direction of the absorber 31 to the distance of 15% of the absorber full length toward a longitudinal direction inner side. Such a region is provided at both ends of the absorber 31, and a region sandwiched between the end regions in the longitudinal direction is referred to as a central region. For example, when the average thickness of the end region in the longitudinal direction is ∨ and the average thickness of the central region of the absorber 31 is W, ∨ / W may be 0.3 to 0.9, 0.5 It may be -0.8. By adjusting the thickness of the absorber 31 in this way, it is possible to widen the air passage 70 in the vicinity of the opening portion 50, and it is also possible to easily escape the steam trapped inside the diaper.

  The top sheet 32 is a member that is in direct contact with the skin of the wearer's crotch and allows liquid such as urine to pass through the absorbent body 31. For this reason, the top sheet 32 is made of a liquid-permeable material having high flexibility. Moreover, the top sheet 32 is arrange | positioned so that the skin opposing surface side of the absorber 31 may be coat | covered. Examples of the liquid permeable material constituting the top sheet 32 are a woven fabric, a nonwoven fabric, or a porous film. Moreover, as the top sheet 32, it is good also as what used the fiber of the thermoplastic resin like a polypropylene, polyethylene, polyester, nylon, for example, and also making it the nonwoven fabric further.

  The back sheet 33 is a member for preventing the liquid that has passed through the top sheet 32 and absorbed by the absorber 31 from leaking to the outside of the diaper. For this reason, the back sheet 33 is made of a liquid-impermeable material. The back sheet 33 covers the absorbent body 31 from the non-facing surface side in order to prevent liquid leakage from the bottom surface of the absorbent body 31. An example of the impermeable material constituting the back sheet 33 is a liquid impermeable film made of polyethylene resin. However, in order to ensure air permeability, it is preferable to use a microporous polyethylene film in which a plurality of fine pores of 0.1 to 4 μm are formed.

  The cover sheet 34 is a member for reinforcing the back sheet 33 and improving its feel. The cover sheet 34 is bonded to the skin non-facing surface side of the back sheet 33. As the material constituting the cover sheet 34, a woven fabric or a non-woven fabric is used. In particular, it is preferable to use a nonwoven fabric or a wet nonwoven fabric made of a thermoplastic resin such as polyethylene, polypropylene, or polyester as a material constituting the cover sheet 34.

  As shown in FIGS. 1 and 2, the absorber main body 30 may include a pair of three-dimensional gathers 35. The pair of three-dimensional gathers 35 are members that stand along both side edges of the absorber 31 and prevent side leakage of urine excreted by the wearer. Each of the three-dimensional gathers 35 is provided with a three-dimensional gather stretchable material at the tip thereof, and rises toward the wearer's skin contact direction when the stretchable material contracts. Therefore, the pair of three-dimensional gathers 35 serves as a urine leakage barrier, and urine that has not permeated through the top sheet 32 or urine that has not been absorbed by the absorber 31 leaks from the leg opening of the disposable diaper. Prevent side leakage. The three-dimensional gather 35 can employ a known configuration used in conventional disposable diapers. The three-dimensional gather 35 can be formed, for example, by sandwiching and fixing a stretched three-dimensional gather elastic material between the layers of the water-repellent sheet. As the water-repellent sheet, for example, a non-woven sheet obtained by a production method such as card embossing or spunbond can be used, and it is particularly preferable to use a non-woven sheet such as SMS or SMMS having high waterproofness.

<Groove>
The absorber 31 may have a groove. In this specification, a groove part means what is comprised in part or all by a recessed part. The groove part may be formed only in the absorber 31. In this case, the core wrap sheet 36 and the top sheet 32 do not have a groove. Further, the groove portion may be formed in a laminated body of the core wrap sheet 36 and the top sheet 32 in addition to the absorber 31.

  The groove portion functions as a flow path for excretory fluid in the absorber 31. That is, the groove portion can also be called a liquid flow path. By providing such a groove in the absorber 31, the groove can exhibit a capillary force. Here, the capillary force is a force that can distribute the excretory fluid along the groove. Thereby, the absorber 31 can diffuse the excretory fluid along the flow path, and can rapidly absorb the excreted fluid excreted in a large amount in a wide area of the absorber 31. Moreover, the absorption of excretory fluid by the absorbent material can be efficiently performed without biasing the excretion of excretory fluid to only a part of the absorbent material constituting the absorber 31.

  Further, by providing the absorbent body 31 with a groove, it is possible to reduce a sense of incongruity caused by the rigidity of the absorbent body itself. In particular, by providing the absorbent body 31 with a groove, it is possible to reduce the discomfort of the absorbent body in the abdomen and back. In addition, since the contact area between the absorbent body 31 and the skin can be reduced in the abdomen and the back, it is possible to eliminate stickiness and a sense of discomfort associated therewith. Furthermore, since the groove portion also functions as a ventilation groove, the stuffiness when the diaper is mounted can be reduced.

  The groove portion is formed intermittently or connected in the longitudinal direction of the absorber 31. For example, a plurality of linear grooves may be provided so that a lattice-like flat part is formed. Moreover, you may provide a several groove part in parallel with the major axis of an absorber. In this case, the plurality of groove portions may be linear or may be wavy lines or zigzag lines. Further, the grooves may be arranged in a plurality of circular shapes.

  The area of the groove is preferably 5 to 50%, more preferably 5 to 45%, and further preferably 8 to 30% with respect to the area of the absorber 31. Moreover, it is preferable that it is 1-10 mm, and, as for the width | variety of a groove part, it is more preferable that it is 2-5 mm. By setting the area and width of the groove within the above range, the fit of the absorber 31 can be more effectively enhanced. Moreover, the groove part can perform the function as a flow path efficiently.

  The groove portion may extend to the longitudinal edge of the absorbent body 31, and may not reach the longitudinal edge of the absorbent body 31. When the groove extends to the longitudinal edge of the absorbent body 31, a small gap is formed between the absorbent body 31 and the skin, so that the air permeability can be further improved. On the other hand, when the groove portion does not reach the longitudinal edge of the absorbent body 31, leakage of excretory fluid can be effectively suppressed.

  A groove part can be formed by reducing the basic weight of the absorber of this groove part, or embossing (squeezing) the absorber 31. FIG. When the basis weight of the absorbent body in the groove portion is reduced, the forming drum is provided with an uneven surface on the outer periphery of the drum in accordance with the shape of the groove portion in the step of forming the absorbent material constituting the absorbent body 31 into a sheet shape having a predetermined shape. It is preferable. In the forming drum, since suction is performed toward the inside of the drum, the absorbent body 31 in which grooves along the uneven surface on the outer periphery of the drum are formed is obtained. Thereafter, core wrap sheets 36 are laminated on the upper and lower surfaces of the absorbent body 31, respectively. In addition, when reducing the basic weight of the absorber of a groove part, you may make the basic weight of the absorber of a groove part zero.

  When the groove part 37 is formed by embossing (squeezing) the absorbent body 31, the embossing may be performed from the skin facing surface side, the skin non-facing surface side, or the both surface side of the absorbent body 31. When embossing is performed from the skin facing surface side, the top sheet 32 may be laminated after embossing the absorber 31, or the embossing may be performed after laminating the top sheet 32 on the absorber 31. . The embossing roll has irregularities corresponding to the shape of the groove portion, and the groove portion is formed by pressing the embossing roll while rotating from the top sheet 32 side. In the embossing process, the top sheet 32 and the absorbent body 31 encapsulated by the core wrap sheet 36 may be bonded at the same time.

DESCRIPTION OF SYMBOLS 1 Front body 2 Back body 3 Crotch part 4 Waist opening part 5 Leg opening part 10 Front body exterior body 20 Rear body exterior body 30 Absorption part main body 31 Absorber body 32 Top sheet 33 Back sheet 34 Cover sheet 35 Three-dimensional gather 36 Core wrap sheet 41 Inner sheet 42 Outer sheet 43 Waist elastic member 44 Cushion forming sheet 45 Inner sheet 46 Tammy elastic member 50 Opening part 51 Joining part 52 Non-joining part 70 Ventilation path 100 Absorbent article

Claims (4)

Having a longitudinal direction and a width direction orthogonal to the longitudinal direction,
The front body, the back body, and the crotch portion located between the front body and the back body are divided in the longitudinal direction,
An absorber disposed from the front body to the back body;
An inner sheet,
An outer sheet disposed on the skin non-facing surface side than the inner sheet;
A cushion-forming sheet disposed on the skin facing surface side than the inner sheet;
A plurality of waist elastic members fixed along the width direction on the skin non-facing surface side than the cushion-forming sheet, and an absorbent article,
At least the inner sheet and the cushion forming sheet are joined at the joint so that joints formed by linear joint lines extending along the longitudinal direction and non-joints are alternately formed. And
An absorbent article in which at least one aperture is provided in a crotch side end region of each non-joined portion of the cushion-forming sheet. Each of the joint portions is formed by aligning linear joining lines extending in the longitudinal direction in two rows,
The absorptive article according to claim 1 in which the interval of the non-joining part formed between said joined parts is wider than the gap between said rows of said joining lines in said joined part.   The absorbent article according to claim 1 or 2, wherein the air permeability of the cushion forming sheet is higher than the air permeability of the inner sheet. The absorbent article according to any one of claims 1 to 3, wherein an area of the aperture is 0.01 to ⁵ cm2.

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