JP5377912B2 - Disposable diapers - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique to indicate any urination within a diaper, which technique enables the diaper to effectively discolor even by urine in a small volume, while making it difficult to do so when it comes into contact with moisture in air. <P>SOLUTION: An elongated pocket 56P consisting of at least either an absorptive material having lower basis weight than the area around it or a material other than the absorptive material free of basis weight is extended at the lateral center of an absorptive material 56 in a longitudinal direction of the diaper so that the pocket 56 may include the point of excretion discharge by a wearer, and where an excretion indicator 90 that will discolor when it comes into contact with such excretion liquid is extended in a longitudinal direction between the absorptive material 56 and a liquid-impermeable sheet 11 along the side of the pocket 56P so that all or part of lateral width of the excretion indicator 90 may overlap the area other than the pocket 56P running along its side. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a disposable diaper provided with an excretion display part.

In an absorbent article such as a disposable diaper, it has been proposed to provide a display unit for visually confirming the occurrence of excretion from the outside of the article. Such a display unit is generally known as an indicator or a notification mark. For example, in current disposable diapers for infants, it can be said that it is essential to provide an excretion display unit that changes color by contact with urine. ing.
Such an excretion display part is hidden behind the absorber and may not be discolored with a small amount of urination, so a part of the absorber that overlaps the excretion display part is partially missing to form a pocket It has been proposed to promote urine supply (see Patent Document 1).
Japanese Patent No. 4124350

However, if the part of the absorber that overlaps the excretion display part is made into a pocket, the entire excretion display part located in the pocket can easily come into contact with moisture in the air, or it may be steamed by sweat from the body, before urination In some cases, the color of the entire film was thin or sparse. In addition, by providing a pocket near the defecation position, it is possible to discolor the excretion indicator due to moisture contained in soft stool or watery stool, but excretion occurs when darker stool flows into the pocket than urine. Although the display part was discolored, it was difficult to distinguish it due to the interference of fecal color.
Therefore, the main problem of the present invention is that it is possible to effectively change the color even with a small amount of urination, but it is difficult for the color to change due to contact with moisture in the air, and it can be suitably used for defecation. To provide technology.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
A liquid-permeable surface sheet;
A liquid impervious sheet;
Between the liquid-permeable surface sheet and the liquid-impermeable sheet, an absorber formed by an aggregate of absorbent materials interposed so as to extend from the ventral part to the dorsal part, and
A pocket formed of at least one of a low-weighted portion having a lower basis weight of absorbent material than the surroundings and a non-weighted portion having no absorbent material provided in the absorber;
An excretion display unit that is provided between the absorber and the liquid-impermeable sheet and changes color by contact with excretory liquid;
A disposable diaper with
The pocket extends in an elongated shape along the front-rear direction so as to include the excretion position in the widthwise center of the absorber,
The excretion display part is configured such that a part extending in the front-rear direction along the side edge of the pocket is defined as the excretion position so that a part or all of the width direction overlaps with a non-pocket part located beside the pocket. It has in the front and rear direction range including,
Covers the surface side of the excretion display part, and has a water-repellent part that prevents the excretion display part from being discolored due to moisture in the air or stuffiness in the diaper only on the back side of the absorber, and passes through the absorber. The excreted liquid component is configured to reach the excretion display part by wrapping around the water-repellent part,
A disposable diaper characterized by that.

(Function and effect)
When the pocket is formed in the absorbent body as described above, even if a small amount of urine is discharged, it diffuses in the pocket along the front-rear direction and is supplied to the back side of the non-pocket portion near the side edge of the pocket. Therefore, according to the present invention, when an excretion display portion having a portion extending in the front-rear direction along the side edge of the pocket is provided so that a part or all of the width direction overlaps with the non-pocket portion located on the side of the pocket. Even with a small amount of urination, urine is supplied to the excretion display unit, and discoloration occurs. Moreover, since the excretion display part of the present invention is partially or entirely hidden behind the non-pocket part, it is difficult to come into contact with moisture in the air, and even if the part near the pocket is discolored, it is completely discolored as a whole. It is hard to happen. In addition, when loose stool or watery stool is excreted, only the stool liquid (also called stool juice, colored in a color close to the stool but more transparent than the solid content of the stool) only penetrates the absorber. Since it is supplied to the excretion display section, the discoloration is easier to understand than in the pocket filled with solid content.
In addition, it was considered that the pocket was formed by compression, but in that case, it was difficult for body fluid to penetrate into the compression part, so it was difficult to see discoloration of the excretion display part with a small amount of urination, and the pocket became hard, and the wearer There is a problem that causes discomfort.
Further, by providing the water repellent portion, the effect of preventing discoloration due to moisture in the air or stuffiness in the diaper is significantly improved.

<Invention of Claim 2>
When the total length of the diaper is L, the front-rear distance between the center of the diaper and the front end of the excretion indicator is DA, and the front-rear distance between the center of the diaper and the rear end of the excretion indicator is DB ,
0.3L / 2 ≤ DA ≤ 0.5L / 2
0.3L / 2 ≦ DB ≦ 0.5L / 2
The disposable diaper according to claim 1, wherein

(Function and effect)
The length in the front-rear direction and the position of the excretion display portion in the present invention are preferably within this range.

<Invention of Claim 3>
When the front-rear direction length of the excretion display unit and Y _1, the length of the pocket and Y _2,
0.5Y ₁ ≦ Y ₂ ≦ 1.5Y ₁
And the disposable diaper of Claim 2 with which 50% or more of the front-back direction range in which the said excretion display part is arrange | positioned overlaps with the front-back direction range in which the said pocket is arrange | positioned.

(Function and effect)
It is preferable that the length and arrangement in the front-rear direction of the excretion display portion in the present invention are determined in this way.

<Invention of Claim 4>
The topsheet has a large number of transmission holes in a predetermined range including a portion overlapping with the pocket, and the portion overlapping with the pocket is not joined to a member adjacent to the lower side at least in the center in the width direction. The disposable diaper of any one of Claims 1-3 in which the accommodation space which continues from the back surface of the said surface sheet to the inside of the said pocket is formed.

(Function and effect)
As described above, when a top sheet having a transmission hole is provided so as to be separated from the pocket at least in the center in the width direction, and a storage space that continues to the inside of the pocket is formed on the back surface side of the top sheet, the top sheet is formed in this storage space. The urine and watery feces and other excretory fluids are quickly supplied through the permeation holes of the stool, so that an excellent discoloration effect can be obtained for small-volume excretion and excretion of watery feces, and the contained urine and watery feces Can be reduced.

<Invention of Claim 5>
The absorbent material is pulp fiber and superabsorbent polymer,
The absorbent body is wrapped by a liquid-permeable packaging sheet,
The excretion indicator is a liquid-impervious hot melt adhesive containing a color-changing substance that changes color by contact with excretory liquid, ink that changes color by contact with excretion components, or ink that dissolves by contact with excretion components. It is formed by being applied to the absorbent body side of the adhesive sheet,
The disposable diaper of any one of Claims 1-4.

(Function and effect)
Such a disposable diaper structure is widely adopted, but the present invention is particularly suitable for such a disposable diaper.

  As described above, according to the present invention, it is possible to effectively change the color even with a small amount of urination, but it is difficult to cause discoloration due to contact with moisture in the air, and it is easy to understand that there was defecation. Is brought about.

  Although an example of a tape-type diaper will be described below, the present invention can be applied to other types of disposable diapers such as a pants type and a pad type. The present invention is naturally applicable to adult disposable diapers.

  1 to 5 show an example of a tape-type disposable diaper according to the present invention. 2 is a view taken along line 2-2 in FIG. 1, and FIG. 3 is a view taken along line 3-3 in FIG. 4 is an enlarged view of a main part, and FIG. 5 is a plan view showing only the main part. This tape-type disposable diaper includes a widthwise central portion 10 in which the absorbent body 56 extends from the front side F to the rear side B from the front / rear direction center C, and an absorbent body that extends to both sides of the absorbent body 56 in the width direction. Both side portions (hereinafter referred to as side flap portions) SF that are not provided are provided, and in the middle in the front direction of each side flap portion SF, a side constricted portion N1 narrower than both sides in the front-rear direction is provided symmetrically. The back tape B of each side flap portion SF is provided with a fastening tape 130 that is connected to the outer surface of the ventral portion at the time of wearing.

  More specifically, the entire outer surface of the diaper is formed by the exterior sheet 12, and in the central portion 10 in the width direction, the liquid-impermeable sheet 11 is formed on the inner surface side of the exterior sheet 12 by an adhesive such as a hot melt adhesive. Further, the absorbent element 50, the intermediate sheet 40, and the top sheet 30 are laminated in this order on the inner surface side of the liquid-impermeable sheet 11. In the illustrated example, the top sheet 30 and the liquid-impermeable sheet 11 have a rectangular shape extending from the abdominal waist edge F1 to the back waist edge B1, and are slightly more in the front-rear direction and the width direction than the absorbent element 50. The liquid-impermeable sheet 11 has a large size and is formed to be slightly wider than the top sheet 30. The peripheral edge that protrudes from the side edge of the absorbent element 50 in the top sheet 30 and the peripheral edge that protrudes from the side edge of the absorbent element 50 in the liquid-impermeable sheet 11 are fixed by a hot melt adhesive or the like. Further, barrier sheets 64 and 64 forming barrier cuffs 60 and 60, which will be described later, are attached with hot melt adhesive or the like over the entire inner surface of the width direction outer side portion from both sides in the width direction.

Hereinafter, the material and characteristic parts of each part will be described in order (exterior sheet).
Although it does not specifically limit as the exterior sheet 12, A nonwoven fabric is suitable. The type of the nonwoven fabric is not particularly limited. As the raw material fiber, for example, synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, and natural fibers such as cotton are used. As a processing method, a spunlace method, a spunbond method, a thermal bond method, an air-through method, a needle punch method, or the like can be used. However, laminated nonwoven fabrics such as SMS nonwoven fabrics and SMMS nonwoven fabrics are preferred in that both the touch and strength can be achieved. In addition to using a single nonwoven fabric, a plurality of nonwoven fabrics can be used. In the latter case, the nonwoven fabrics 12 are preferably bonded to each other with a hot melt adhesive or the like.

(Surface sheet)
The top sheet 30 is preferably liquid permeable and has a small amount of water retention, and a nonwoven fabric is suitably used from the viewpoint of touch and the like. The nonwoven fabric used for the top sheet 30 is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. In particular, an air-through nonwoven fabric, a spunbonded nonwoven fabric, a pointbonded nonwoven fabric, or an SMS nonwoven fabric having a fineness of raw material fibers of 1.0 to 3.0 dtex and a fiber basis weight of 10 to 30 g / m ² are suitable.

  Further, the top sheet 30 may be composed of one sheet or may be composed of a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.

(Through hole of surface sheet)
The topsheet 30 preferably has a large number of permeation holes in a predetermined range including the defecation position Z or the vicinity thereof. Even if a large number of the through holes H are arranged over the entire surface sheet 30 or the entire surface exposed portion of the surface sheet 30 (the portion between the base ends of the rising portions of the barrier cuffs), the center portion in the width direction of the surface exposed portion, etc. It may be provided only in a part in the width direction.

  The illustrated example shows one preferable form of the arrangement of the transmission holes H. That is, the top sheet 30 has the following regions based on the correspondence between the cracks on the back side and the tops of the left and right bulges of the buttocks. That is, the topsheet 30 is located on the left side and the right side of the width direction central region 31 through the part corresponding to the crack and extending from the front end F1 to the rear end B1, and on the left side and the right side, respectively. The left and right intermediate regions 32 and 32 extending from the front end F1 to the rear end B1 through the portions corresponding to the top and the top of the right collar, along the left side of the left intermediate region 32 and the right side of the right intermediate region 32 And left and right regions 33, 33 extending from the front end F1 to the rear end B1, respectively. Furthermore, in the illustrated embodiment, the top sheet 30 is disposed on the left side of the left region and on the right side of the right region, and the liquid sheet that oozes out to both ends in the width direction of the intermediate sheet 40 and in the width direction in the illustrated embodiment. Side edge regions 34 and 34 including portions for bonding and fixing to the permeable sheet 11 are provided, and the left and right regions 33 are regions located on the absorbent element 50.

  Specifically, in the baby diaper, the width of the central region 31 in the width direction is about 10 to 40 mm, the width of the left intermediate region and the right intermediate region 32 is about 15 to 25 mm, and the width of the left region and the right region 33 is 10 to 10 mm. It is appropriate to set it to about 20 mm.

And in this embodiment, as shown also in FIG. 4, in order to permeate | transmit solid content, such as watery feces, to the back surface side to each of the width direction center area | region 31, the left side, and the right side area | region 33 in the surface sheet 30. A large number of permeation holes H are perforated at a predetermined interval, and the permeation holes H are not perforated in the left and right intermediate regions 32 and 32 as a whole. Accordingly, the width direction central region 31, the left side and the right side are arranged so that the width direction arrangement of the perforated range and the non-perforated range of the transmission holes H is applied to at least the crack, the top portion of the heel portion, and the portion corresponding to the outer side in the width direction. The range of the area 33 is determined. In addition, if the crack, the top of the buttock, and the portion corresponding to the outer side in the width direction are included, only a part of each region 31 to 33 in the front-rear direction has such a width direction arrangement of the piercing range and the non-piercing range. For example, it is possible to adopt such a pattern only on the back side B, and in the width direction, the range over the entire width, or the width direction central region 31, the left and right intermediate regions 32, 32, It is also possible to make the range over the left and right regions 33, 33 the perforation range.
Further, when the width of the left and right regions 33, 33 is narrower than the width of the central region 31 in the width direction, when the wearer lies down sideways, the buttock is returned from the transmission hole H of the left or right region 33 that contacts the buttock. This is preferable because the amount of excrement adhering to the water is small.

  The opening shape of the transmission hole H can be an appropriate shape such as a circle, an ellipse, an oval, a leaflet shape, a polygon, etc., but the length HL in the front-rear direction is 4 to 15 mm, particularly 6 to 8 mm. It is preferable that the width direction length HW is an elongated shape (elliptical shape, oval shape, leaf shape) shorter than the length HL in the front-rear direction.

Although the opening area of the transmission hole H may be appropriately determined, it is preferable to be 0.8～180Mm ^2, particularly preferably in a 5～80Mm ^2, and most preferable to be 10 to 30 mm ^2. If the opening area is too small, the solid content taking-in performance is lowered.

  The number of transmission holes H can be determined as appropriate. As shown in the figure, the arrangement of the transmission holes H is such that the transmission hole arrays in which the transmission holes H are arranged at predetermined intervals in the front-rear direction are provided at predetermined intervals in the width direction. In the case of the above-described arrangement and the opening area of the transmission holes H described above, the width-direction interval DW between the columns of the transmission holes H is 1 to 5 mm, and the interval DL between the transmission holes H in the column is 1 to 1 It is preferable to determine the number and arrangement in each of the regions 31 to 33 so as to be 10 mm. If the interval between the permeation holes H is too wide, the solid content is easily captured without being captured, and if it is too narrow, the number of permeation holes is excessively increased, and the solid content easily comes into contact with the skin via the permeation holes H.

  The arrangement of the through holes H can be a staggered arrangement (illustrated example) or a lattice (matrix) arrangement, and other regular or irregular arrangements can be adopted. For example, unlike the above example, as shown in FIGS. 10 (a) and 10 (b), a permeation hole H is formed in the defecation position Z in the top sheet 30 or in the vicinity thereof, and the surrounding portion thereof, and the defecation position Z or The opening area of the permeation hole H in the vicinity thereof is made larger than the permeation hole H in the surrounding part, or as shown in FIG. As shown in FIG. 10D, the longitudinal direction of the shape of a part (or all) of the permeation holes H is centered on the defecation position Z or the vicinity thereof. It can also be shaped along the radial direction. By forming the permeation hole H with these patterns, the passage of feces through the permeation hole H is promoted more than the other parts at the defecation position Z or in the vicinity thereof. Of course, a pattern in which these features are combined can also be adopted.

The surface sheet 30 having the permeation holes H is formed by punching the perforation hole forming portion into a predetermined shape, perforating while being melted by a heat roller provided with a plurality of protrusions (special table 2002-512909), or applying a negative pressure. After forming a slit along a predetermined direction (front-rear direction, width direction, etc.) at a perforation hole forming position (Patent No. 2812340) or forming a three-dimensional taper by suction stretching heat treatment on an open conveyor The sheet can be produced by a method (Japanese Patent Application Laid-Open No. 11-253490) in which the sheet is stretched in a direction perpendicular to the slit and fixed to a member on the back side (intermediate sheet 40 or absorbent element 50) with the slit expanded. Among them, after forming a slit along the front-rear direction at the transmission hole forming position, the sheet is expanded in the width direction, and the slit is enlarged to form an opening, and the sheet is melted and solidified by heat treatment particularly in the opening and its periphery. It is most preferable in that it is soft and excellent in liquid permeability by being hardened and having a wide fiber interval.
However, in this case, since the transmission hole H is easily closed when the diaper is bent, the both sides of the perforated region are adjacent to the lower side of the slit in an enlarged state, that is, the intermediate sheet 40 (intermediate sheet in the illustrated embodiment). When 40 is omitted, it is desirable to join the packaging sheet 58, and when the packaging sheet 58 is omitted, the absorbent body 56) is joined by a joining means such as hot melt adhesive g, heat sealing or ultrasonic sealing. In the illustrated embodiment, continuous bonding is performed over the entire front-rear direction, but it can also be intermittently bonded in the front-rear direction. Further, the bonding pattern is not limited to a linear shape, and may have a shape such as a dot or a circle. Furthermore, in the illustrated embodiment, the bonding is performed at the intermediate portion in the width direction of the non-perforated region, but it is preferable to bond at the boundary between the perforated region and the non-perforated region because the opening can be maintained more reliably. In this case, in the intermediate portion in the width direction of the non-perforated region, the top sheet 30 and the member adjacent to the lower side thereof are not joined, or the joining area is smaller than the boundary portion with the perforated region. The area ratio of the part is preferably ½ or less. The boundary between the perforated region and the non-perforated region specifically includes a boundary line and a width direction range of about 10 mm, preferably about 5 mm on both sides thereof. Thus, it is preferable to join both sides of the transmission hole H in the topsheet 30 to the lower member because the transmission hole H is difficult to close even if the diaper is bent. In addition, when bonding is performed in the non-perforated region, even if the adhesive g is used for the bonding, the adhesive g hardly adheres to the skin through the permeation holes H.

(Intermediate sheet)
An intermediate sheet (also referred to as a second sheet) 40 is provided between the top sheet 30 and the absorbent element 50 in order to move excrement that has passed through the top sheet 30 to the absorber and prevent reversal. This intermediate sheet 40 not only improves the absorption performance of the absorbent by quickly transferring the excrement to the absorber, but also prevents the excretion of the absorbed excrement from reversing from the absorber and improves the surface feel of the surface sheet 30. To do. The intermediate sheet 40 can be omitted.

  As the intermediate sheet 40, the same material as the top sheet 30 can be used, but an air-through nonwoven fabric that is particularly bulky and excellent in liquid permeability is preferable. Further, considering the permeation of the solid content in the stool, the fineness of the fiber used for the intermediate sheet 40 is preferably 5.0 to 7.0 dtex, but the liquid residue in the top sheet 30 increases. On the other hand, when the fineness of the fiber used for the intermediate sheet 40 is 1.0 to 2.0 dtex, the liquid residue of the top sheet 30 is hardly generated, but the solid content of the stool is hardly transmitted. Therefore, it is preferable that the fiber of the nonwoven fabric used for the intermediate sheet 40 has a fineness of about 2.0 to 5.0 dtex.

  It is preferable that the intermediate sheet 40 has a shape including the entire formation range of the permeation holes H so that the feces that have passed through the permeation holes H can be reliably captured. The intermediate sheet 40 in the illustrated form is arranged in the center shorter than the width of the absorbent element 50, but may be provided over the entire width. As in the illustrated example, the intermediate sheet 40 preferably extends from the front end to the rear end of the diaper in the same manner as the top sheet 30, but may extend from the front end to the rear end of the absorbent element 50. It may be a short length range centering on.

(Barrier cuffs)
In order to prevent urine and soft stool that move laterally on the top sheet 30 and prevent side leakage, barrier cuffs 60, 60 that protrude (stand up) on the use surface side are provided on both sides of the product. preferable.
This barrier cuff 60 is formed mainly of a barrier sheet 64. The inner surface of the barrier sheet 64 has a fixing start end in the width direction on the side portion of the top sheet 30, and a portion on the outer side in the width direction from the fixing start end is on the side portion of the liquid-impermeable sheet 11 and the outer side in the width direction. It fixes to the side part of the exterior sheet | seat 12 located with the hot-melt-adhesive agent etc. As shown in FIG. 3, both the front and rear direction end portions of the barrier sheet 64 on the center side in the width direction are fixed to the surface sheet 30, but the intermediate portion between them is an unfixed free portion. The elongated elastic elastic member 62 is fixed to the free part in an extended state along the front-rear direction. The fixed portion of the barrier sheet 64 is indicated by the hatched portion in FIG. Further, in the vicinity of the fixing start end of the fixing portion of the barrier sheet 64, elastic elastic members 66 such as thread rubber are respectively provided along the front-rear direction between the sheets where the barrier sheet 64 and the exterior sheet 12 face each other. Yes. As the barrier sheet 64, a water-repellent nonwoven fabric can be used, and as the elastic elastic member 62, thread rubber or the like can be used. As shown in FIGS. 1 and 2, a plurality of elastic elastic members 62 can be provided in addition to the plurality.

  The inner side in the width direction from the sticking start end of the barrier cuff 60 is fixed on the surface sheet 30 at both ends in the product front-rear direction, but the portion in between is an unfixed free portion. It comes to stand by contraction force. When the diaper is worn, the diaper is worn on the body in the shape of a boat, and the contraction force of the rubber thread 62 acts on the diaper, so that the barrier cuff 60 stands up and comes into close contact with the legs around the contraction force of the rubber thread 62. As a result, so-called side leakage from around the legs is prevented.

(Absorption element)
The absorption element 50 is a part that absorbs and holds liquid such as urine and loose stool. The absorbent element 50 includes an absorbent body 56 and a packaging sheet 58 that wraps at least the back and side surfaces of the absorbent body 56. The packaging sheet 58 can be omitted. Further, in the illustrated embodiment, the holding sheet 80 is provided between the absorbent body 56 and the back surface side portion (lower part) of the packaging sheet 58, but the holding sheet 80 may be omitted. The absorbent element 50 can be adhered to the inner surface of the liquid-impermeable sheet 11 via an adhesive such as a hot melt adhesive on the back surface.

(Absorber)
In the middle of the absorber 56 in the front-rear direction, an absorber narrow portion N2 having a narrower width than both front and rear sides is formed symmetrically. The minimum width W4 of the absorber narrow portion N2 is preferably about 70 to 80% of the absorber width W3. Such an absorbent body 56 can be formed by an aggregate of fibers 52 and 52. As this fiber assembly, a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate as well as short fibers such as cotton-like pulp and synthetic fibers Can also be used. The fiber basis weight can be set to, for example, about 100 to 300 g / m ² when cotton-like pulp or short fibers are stacked, and in the case of a filament aggregate, for example, about 30 to 120 g / m ^2. Can do. The fineness in the case of a synthetic fiber is 1-16 dtex, for example, Preferably it is 1-10 dtex, More preferably, it is 1-5 dtex. In the case of a filament aggregate, the filament may be a non-crimped fiber, but is preferably a crimped fiber. The crimped degree of the crimped fiber can be, for example, 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. Further, a crimped fiber that is uniformly crimped is often used.

(Casting Department)
In this embodiment, the intersection P2 of the square diagonal line circumscribing the absorber constricted portion N2 is about 35 to 45% when the total length L of the diaper is 100% with the waist edge on the ventral side as a reference (0%). The intersection P1 of the square diagonal line located in the direction range, particularly preferably in the front-rear direction range of 35 to 40% and circumscribing the side constricted portion N1 is based on the waist edge on the ventral side (0%) When the total length L of the diaper is 100%, it is located in the front-rear direction range of 40-49%, particularly preferably in the front-rear direction range of 45-49%. Furthermore, the intersection P1 is located on the rear side of the diaper in the front-rear direction with respect to the intersection P2. The total length of the diaper is about 300 to 550 mm in a general infant diaper, and about 300 to 400 mm in an infant diaper that is most suitable for application of the present invention.

  As a result, as shown schematically in FIG. 11, the diaper 100 naturally fits the body 200 in a state of tilting forward than before, and a large area of the absorbent body on the back side of the wearer is secured. More moisture can be absorbed in the process in which stool or the like flows to the back side, and fluidity can be further reduced. Therefore, it is difficult for backrest such as watery stool to occur. Incidentally, as far as the inventor knows, in the conventional diaper, the intersection P2 of the square diagonal line circumscribing the absorbent body constricted portion N2 is 46 when the total length L of the diaper is 100% based on the waist edge on the ventral side. The intersection P1 of the square diagonal line circumscribing the side constricted portion N1 that is located in the front-rear direction range of ˜55% is 45% when the total length L of the diaper is 100% based on the waist edge of the ventral side. It is located in the front-rear direction range of 55%.

  The minimum width W2 of the side constricted portion N1 is preferably about 65 to 90% of the diaper width W1, and the minimum width W4 of the absorber constricted portion N2 is about 70 to 80% of the absorber width W3. Is preferable.

(Superabsorbent polymer particles)
As shown in FIG. 2, the absorbent body 56 preferably includes superabsorbent polymer particles 54, 54..., In particular, at least in the liquid receiving region, the superabsorbent polymer particles with respect to the aggregate of fibers 52, 52. It is desirable that (SAP particles) be dispersed substantially throughout the thickness direction.

  If there is no SAP particle in the upper part, the lower part, and the middle part of the absorber 56, or if there is very little, it cannot be said that the "absorbed throughout the thickness direction". Therefore, “distributed in the entire thickness direction” means “distributed unevenly in the upper part, the lower part, and / or the middle part of the aggregate of fibers in addition to the form“ uniformly ”distributed in the entire thickness direction. However, it is still included in the form of being dispersed in the upper, lower and middle portions. Further, a form in which some of the SAP particles do not penetrate into the aggregate of the fibers 52, 52... And remains on the surface, or a part of the SAP particles passes through the aggregate of the fibers 52, 52. The form on 58 and the form on the holding sheet 80 are not excluded.

  The superabsorbent polymer particles 54 include “powder” in addition to “particles”. As the particle diameter of the superabsorbent polymer particles 54, those used for this type of absorbent article can be used as they are, and those having a particle size of 1000 μm or less, particularly 150 to 400 μm are desirable. The material of the superabsorbent polymer particles 54 can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable. Examples of the superabsorbent polymer particles 54 include starch-based, cellulose-based and synthetic polymer-based polymers, such as starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, and sodium carboxymethylcellulose. A cross-linked product or an acrylic acid (salt) polymer can be used. The shape of the superabsorbent polymer particles 54 is preferably a granular material that is usually used, but other shapes can also be used.

  As the superabsorbent polymer particles 54, those having a water absorption speed of 40 seconds or less are preferably used. When the water absorption speed exceeds 40 seconds, so-called reversion in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56 is likely to occur.

The basis weight of the superabsorbent polymer particles 54 can be appropriately determined according to the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² . If the amount of polymer is less than 50 g / m ^2, it is difficult to secure the absorption amount. If it exceeds 350 g / m ² , not only will the effect be saturated, but an excessively high superabsorbent polymer particle 54 will give a sense of incongruity.

(Packaging sheet)
When the packaging sheet 58 is used, as the material, tissue paper, particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet with small holes, or the like can be used. However, it is desirable that the superabsorbent polymer particles be a sheet that does not escape. When a nonwoven fabric is used instead of the crepe paper, a hydrophilic SMS (spunbond / meltblown / spunbond) nonwoven fabric or SMMS nonwoven fabric is particularly suitable, and polypropylene, polyethylene / polypropylene, or the like can be used as the material. The basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .

  As shown in FIG. 2, the packaging sheet 58 wraps only the back surface and side surfaces of the layer of the continuous fibers 52, 52... And the superabsorbent polymer particles 54, 54. It may be a thing. Although not shown, only the upper and side surfaces of the absorbent body 56 are covered with crepe paper or a nonwoven fabric, and the lower surface is covered with a liquid-impermeable sheet such as polyethylene, and the upper surface of the absorbent body 56 is covered with crepe paper or a nonwoven fabric. For example, the lower surface may be covered with a liquid-impermeable sheet such as polyethylene (each of these materials is a component of the packaging sheet). If necessary, the aggregate of continuous fibers 52, 52... And the layer of superabsorbent polymer particles 54, 54... May be sandwiched between two upper and lower sheets or disposed only on the lower surface. This is not a desirable form because it is difficult to prevent the movement of particles.

(Holding sheet)
When a filament aggregate is used for the fiber 52, it is preferable to provide a holding sheet 80. In the case where the holding sheet 80 is provided, the superabsorbent polymer particles 54 can be interposed between the holding sheet 80 and the absorbent body 56 by spraying or the like. The superabsorbent polymer particles 54 may pass through the filament aggregate at the time of supply to the filament aggregate or in the subsequent process or until the consumer uses it. The unevenness of the superabsorbent polymer particles that have passed through the filament aggregate gives a crisp and uncomfortable feeling when touched by a hand when used by a consumer.
The holding sheet 80 reinforces the stiffness that is not sufficient only by the packaging sheet 58 such as tissue paper (crepe paper), and also reduces or prevents a jarring sense of incongruity when the consumer touches it with the hand. Fulfill.

  The material of the holding sheet 80 is not particularly limited as long as it has a holding performance of the superabsorbent polymer 54. Specifically, for example, non-woven fabric, crimped pulp, low-absorbency cotton fiber (for example, non-degreased cotton fiber, degreased cotton fiber, rayon fiber treated with a water repellent or a hydrophobizing agent, etc.). ), Polyethylene fiber, polyester fiber, acrylic fiber, polypropylene fiber, silk, cotton, hemp, nylon, polyurethane, acetate fiber and the like.

The holding sheet 80 preferably has a thickness larger than the particle diameter of the superabsorbent polymer particles. The basis weight of the holding sheet 80 is 10 to 60 g / m ^2, it is preferred in particular 20 to 40 g / m ^2.

In particular, the holding sheet 80, the compression energy 0.01~10.00gfcm / cm ² based on KES test, preferably at 0.01~1.00gfcm / cm ^2, and the compression resilience from 10 to 100%, preferably Is preferably 70 to 100% non-woven fabric.

  Further, since the superabsorbent polymer 54 that has slipped out is held by the holding sheet 60 and does not move on the packaging sheet 58, uneven distribution of absorption capacity is less likely to occur. In particular, in order to prevent the superabsorbent polymer particles 54 from moving on the holding sheet 80, an adhesive hot melt adhesive or the like can be applied on the holding sheet 80 in advance. Alternatively, the upper surface of the holding sheet 80 (surface toward the use surface side) may be a rough surface to prevent the superabsorbent polymer particles 54 from moving on the holding sheet 80. Examples of the roughening or fluffing means for this purpose include a non-net surface that is not a net surface during the production of the nonwoven fabric, a marble process, a needle punch process, and a brushing process.

  As shown in FIG. 2, the holding sheet 80 may be provided only below the absorber 56, or may be wound up and extended to the upper surface of the absorber 56 through the side surface of the absorber 56, although not shown. It is also possible to use a plurality of holding sheets 80 in a stacked manner.

  The above example is an example in which the holding sheet 58 is provided between the absorbent body 56 and the back side portion of the packaging sheet 58, but the holding sheet may be on the back side of the packaging sheet 58 (the form is illustrated). In short, if a holding sheet is provided on the back surface side of the absorbent body 56, it is possible to reduce or not cause a crisp discomfort when touching from the back surface of the product.

(Fastening tape)
The fastening tape 130 has a base portion of a fastening base material 130C made of plastic, polylaminated nonwoven fabric, paper or the like joined to a diaper, and a hook member 130A of a mechanical fastener is provided as a locking portion for the abdomen at the tip side portion thereof. ing. The hook member 130A is joined to the fastening base material 130C by an adhesive so as not to be peeled off. The hook member 130A has a large number of engaging protrusions on the outer surface side. The shape of the engaging protrusion is (A) Le-shaped, (B) J-shaped, (C) Mushroom-shaped, (D) T-shaped, (E) Double J-shaped (J-shaped And the like may be any shape. Instead of the hook member 130 </ b> A, an adhesive material layer can be provided as a locking portion of the fastening tape 130.

  When wearing the diaper, the fastening tape is locked in place on the outer surface of the ventral side with the dorsal sides on the outside of the ventral sides. The position and size of the fastening portion of the fastening tape 130 can be arbitrarily determined. In a normal case, the locking portion is a rectangular range having a height of 20 to 80 mm and a width of 150 to 300 mm, and a distance in the height direction between the upper end edge and the ventral upper edge F1 is 0 to 60 mm, particularly 20 to 50 mm. And it is preferable to set it as the center of the width direction of a product.

  In order to facilitate locking, it is preferable to provide a target tape 74 at the locking position of the fastening tape 130 on the ventral outer surface. As the target tape 74, when the locking portion is the hook member 130A, a tape having a large number of loop yarns on the surface where the engaging protrusions of the hook member are entangled can be used. A film having a smooth surface that is rich in properties can be used.

  Further, when the fastening portion of the fastening tape 130 on the outer surface of the ventral side is made of nonwoven fabric, for example, when the exterior sheet 12 of the illustrated form is made of nonwoven fabric, and the fastening portion of the fastening tape 130 is the hook member 130A, The target tape 74 can be omitted, and the hook member 130A can be entangled with the nonwoven fabric of the exterior sheet 12 and locked.

(pocket)
An elongated pocket 56P is formed along the front-rear direction so as to include the excretion position (at least one of the urination position and the defecation position Z) at the center in the width direction of the absorber 56. The pocket 56P is composed of at least one of a low-weighted portion where the basis weight of the absorbent material (for example, pulp and high-absorbent polymer) constituting the absorbent body 56 is lower than the surroundings, and a non-weighted portion (missing portion) not included at all. is there. Accordingly, a form in which a part is an unweighted part and the other part is a low-weighted part, for example, as shown in FIG. 6, the front-rear direction intermediate part PM is an unweighted part of the absorbent material, and the parts PF, PB on both sides of the front and rear It is also possible to adopt a form in which is a low weight part. In addition, the example shown in FIGS. 12 and 13 shows a case where the pocket 56P is formed by an unweighted portion.

The basis weight of the low basis weight portion and the non-pocket portion (portion located on the side of the pocket) can be adjusted as appropriate, but when the absorbent body 56 is made of pulp and a super absorbent polymer, It is preferably 0 to 125 g / m ^2, and the basis weight of the polymer is preferably 0 to 115 g / m ² , the basis weight of the non-pocket pulp is 150 to 250 g / m ² , and the basis weight of the polymer is 130 to 230 g / m ² . Is preferred.

When the front-rear direction length and position of the pocket 56P is may be appropriately determined, the longitudinal length of the excretory display unit 90 to be described later and Y _1, the longitudinal direction length of the pocket 56P was Y _2,
0.5Y ₁ ≦ Y ₂ ≦ 1.5Y ₁
It is preferable that 50% or more, particularly 80% or more of the front-rear direction range in which the excretion display unit 90 is disposed overlap with the front-rear direction range in which the pocket 56P is disposed.

  Further, the depth of the pocket 56P is appropriately about 50 to 100% of the thickness dimension of the absorber 56. When the depth of the pocket 56P is 100% of the thickness dimension of the absorber 56, that is, the pocket 56P is an unweighted portion that does not include the absorbent material constituting the absorber 56, the effect of the present invention becomes remarkable. Even when hard stool with less water is excreted, it is easy to visually recognize the color of the stool through the liquid-impermeable sheet 11 and the exterior sheet 12, and thus it is easy to understand that the stool was present.

  In particular, the above-described transmission hole H is formed in a predetermined range including a portion overlapping the pocket 56P in the top sheet 30, and the portion overlapping the pocket 56P in the top sheet 30 is not joined to a member adjacent to the lower side thereof, Alternatively, it is desirable to join at a part other than the central portion in the width direction to form a continuous accommodation space from the back surface of the top sheet 30 to the inside of the pocket 56P. When sheets such as the intermediate sheet 40 and the packaging sheet 58 are present between the absorbent body 56 and the top sheet 30 as shown in the figure, these intermediate members are recessed in the pocket 56P, so that An accommodation space is formed. As shown in FIG. 1, in the case where one or a plurality of transmission hole rows formed in a row in the front-rear direction are formed in the width direction, the transmission holes H are slits as described above. In the case of forming by formation and its enlargement, at least one row of transmission hole rows is disposed so as to pass over the pocket 56P, and both side portions of one or more rows of transmission hole rows passing over the pocket 56P are disposed below it. If it joins to the member which adjoins the side, collapse of the accommodation space by the fall in the pocket 56P of the top sheet 30 will be suppressed, and also the penetration hole H communicating with the accommodation space will be difficult to close.

  By adopting such a structure, the time for the water-like stool etc. to escape into the accommodation space formed on the back surface side of the top sheet 30 through the permeation hole H and absorb the water such as the water-like stool It will be secured longer. Therefore, the above-described back leakage prevention effect is further enhanced. Moreover, since watery stool etc. is escaped to the accommodation space of the back surface side of the top sheet 30, adhesion to skin of watery stool etc. can also be suppressed. It also leads to an improvement in the absorption rate of urine as well as watery stool. Of course, unlike the illustrated embodiment, the entire member positioned on the surface side of the absorber 56 may be recessed in the pocket 56P (including the top sheet 30).

  In general, it is desirable that the pocket 56P is large. However, if the area is simply increased, the top sheet 30 loosens and becomes wrinkled or the top sheet 30 and the back surface of the top sheet 30 when the top sheet 30 and the pocket 56P are not joined as described above. The non-contact area with a member adjacent to the side increases, and the liquid tends to remain on the top sheet 30. Therefore, the pocket 56P is preferably an elongated pocket extending along the front-rear direction. In particular, as shown in the figure, the pocket 56P extends to the front side from the intersection P2 of the square diagonal lines circumscribing the absorber constricted portion N2. It is preferable. Further, as shown in FIG. 5, the pocket 56P extends along the front-rear direction from the front side of the square circumscribing the absorber narrow portion N2 to the rear side from the rear end of the quadrilateral circumscribing the absorber narrow portion N2. It is more preferable. Thus, by arranging the pocket 56P from the back side to the ventral side so that the excrement can be guided in the ventral direction, the pocket 56P functions sufficiently even if the excretion amount is large. Further, as described above, even when the absorber narrow portion is forward and the area of the abdomen side of the absorber is small, the pocket 56P extends to the abdomen, and this also functions as a urine guide path. Therefore, the absorber on the back side portion can be used for urine absorption more efficiently, and the decrease in absorption performance on the ventral side can be compensated. Of course, the improvement in the permeability of the liquid top sheet 30 and the increase in the urine absorption rate due to the increase in the surface area of the absorber 56 are also more remarkable.

The width of the pocket 56P is 10 to 40 mm, particularly about 10 to 20 mm. The width of the pocket 56P is preferably larger than the depth dimension of the pocket 56P and smaller than the dimension obtained by dividing the width of the crotch portion of the absorbent body 56 into five equal parts. When the width of the pocket 56P is smaller than the depth dimension of the pocket 56P, the accommodation space is insufficient. Since the pocket 56P provided at the center in the width direction corresponds to a crack, if the width is larger than the dimension obtained by dividing the width of the crotch portion of the absorbent body 56 into five equal parts, the left and right intermediate regions of the top sheet described above Since it becomes so wide that it covers 32, 32, it is not appropriate.

  When the pocket 56P has such an elongated shape, the topsheet 30 is difficult to loosen, the non-contact area between the topsheet 30 and the adjacent member is reduced, and the liquid residue of the topsheet 30 is reduced. In the case of the illustrated embodiment, if the pocket 56P is wide, the topsheet 30 is bent and contacts the bottom of the pocket 56P, and the volume of the pocket 56P is likely to be greatly reduced. However, if the pocket 56P is elongated, the topsheet 30 Is hardly grounded to the bottom of the pocket 56P, and there is an advantage that there is little decrease in volume. Furthermore, if the pocket 56P is elongated, the absolute design volume is inevitably reduced as compared with the wide case. Therefore, the volume of the pocket 56P may be insufficient depending on the amount of excretion. As described above, it is preferable to ensure that the pocket functions sufficiently even if the amount of excretion is large, by securing the ventral side sufficiently long and guiding the excrement also in the ventral direction. In addition, as described above, when the position of the absorbent body constricted portion 56N is considerably closer to that of the prior art and the area of the ventral part of the absorbent body 56 is small, the absorption performance of urine on the ventral side, particularly the diffusion performance, is It tends to decrease. However, if the pocket 56P is extended to the ventral side, it also functions as a urinary guiding path, so that the absorber 56 on the ventral part can be used for absorption more efficiently, and the absorption performance on the ventral side is reduced. Can be compensated.

  The number of pockets 56P is preferably about 1 to 5, and is preferably arranged symmetrically with respect to the center in the width direction. For example, as the pocket 56P, only one elongated pocket having a predetermined width may be provided along the center in the width direction. However, as shown in FIG. A number of elongated pockets are provided at predetermined intervals in the width direction, or, as shown in FIG. 9, a wide portion having a width larger than the front side at the defecation position Z or in the vicinity thereof is provided. By doing so, it is also a preferred form to secure the volume of the accommodation space. Since the defecation position Z or the vicinity thereof corresponds to a portion (crack) between the wearer's buttocks V and V, it is difficult to apply pressure due to the wearer's buttocks V and V, and even if the area of the pocket 56P is increased, It is difficult for the topsheet 30 to contact the bottom of the pocket 56P.

  In the case where the pocket 56P is provided in a plurality of rows at the defecation position Z or in the vicinity thereof, and only one row is provided on the front side thereof, or the pocket 56P is provided in a row on the front side thereof, and in the shape expanded from the front side thereof in the defecation position Z or in the vicinity thereof It is preferable that the range in which the plurality of rows are provided or the range in which the width is increased is set behind the diagonal of the rectangle circumscribing the absorber narrow portion N2, and behind the diagonal of the rectangle circumscribing the side constricted portion N1. More preferably. In the case where a plurality of rows of pockets 56P are provided along the center in the width direction, it is also preferable that they are provided so as to correspond to the perforated region of the topsheet instead of corresponding to only the crack. For example, if the pocket 56P is provided not only in the perforation range of the central region 31 in the width direction but also in the perforation ranges of the left and right regions 33 so that the pocket 56P and the perforation range correspond to each other, In the region 31, the absorbability is improved as described above, and in the left and right regions 33 corresponding to the top of the buttocks, the volume of the pocket 56P is somewhat reduced by being pressed by the top of the buttocks, but excretion to the skin. The adhesion of objects can be reduced. If the pockets 56P provided in the left region and the right region 33 are also elongated, the topsheet 30 is unlikely to contact the bottom of the pocket 56P even when strongly pressed by the collar as described above. In the case where a plurality of rows of pockets 56P are provided in the front-rear direction, if the elongated pockets 56P and wider absorbent body portions are alternately formed in the width direction, the amount of absorption is less decreased, And since the shape of the absorber 56 is stabilized, it is preferable. Thus, a plurality of perforated regions along the front-rear direction formed by enlarging the slits are formed in the width direction, and a plurality of elongated pockets 56P are formed so as to correspond to the perforated regions, and a non-perforated region (non-pocket region) The form in which the surface sheet 30 and the member adjacent to the lower side thereof are joined is the best combination that makes use of the respective merits and compensates the demerits.

  The shape of the pocket 56P preferably extends linearly along the front-rear direction with a predetermined width, but may extend in a curved shape, a wave shape, a zigzag shape, etc. Moreover, the shape etc. which a width | variety expands as it goes to the back side from a defecation position or its vicinity can also be employ | adopted. When a plurality of pockets 56P are provided, the shape can be made different for each pocket.

(Excretion display part)
Between the absorbent body 56 and the liquid-impermeable sheet, there is provided an excretion display portion 90 that changes color by contact with excretory liquid. The excretion display unit 90 includes a colorant that exhibits a color reaction by contact with moisture in the excrement and / or a colorant that exhibits a color reaction by detecting pH in the water, or an excretory liquid component. The reaction that the color disappears due to the reaction of the above, the reaction that the colorant dissolves in the urine and blurs or disappears, and other visual changes are composed of the ink or adhesive containing the drug, It can be constituted by a display sheet that directly contains a drug showing change or is held via ink or adhesive. For example, as a colorant that exhibits a color reaction upon contact with the excretory fluid, a water-soluble, water-decomposable dye or leuco dye and a phenolic compound that develops color of the leuco dye, an acidic substance, an electron-accepting substance, etc. It is possible to use a colorant consisting of the above developer. When ink is used, water-soluble ink that dissolves by contact with excretory components can be used. If water-soluble ink and water-insoluble ink are mixed and used, only water-soluble ink dissolves by contact with excretory components. It can also be made to appear discolored by being removed. Further, as the base material of the display sheet, the same material as the liquid-impermeable sheet 11 can be used in addition to a liquid-permeable material such as paper such as crepe paper and nonwoven fabric.

  It is common and preferable to form an excretion display unit 90 by applying ink or an adhesive on the side of the absorbent body 56 of an existing diaper, for example, a liquid-impermeable sheet. It can also apply | coat to the part located in a back surface side, or can apply | coat to the back surface of the absorber 56. When ink is used, the excretion indicator 90 can be formed by adding a colorant to the ink and printing it on the target site by gravure printing or flexographic printing. When an adhesive is used, the excretion indicator 90 can be formed by applying a water-soluble polymer to which a water-insoluble component such as a resin and a colorant are added by a known adhesive application means. . Specific examples of the adhesive in this case include a water-soluble polymer composed of polyethylene glycol molecular weight of 100 to 500, polyvinyl pyrrolidone, vinyl acetate copolymer, and water-soluble polyester. The component and the thing which added the coloring agent which instruct | indicates the acidity and alkalinity degree (pH) of the liquid which contacts can be mentioned. In particular, when an adhesive is used, a hot melt adhesive can be used.

  On the other hand, when using the above-mentioned display sheet, it can be provided between any sheets between the absorber 56 and the liquid-impermeable sheet 11. When this sheet-like excretion display unit 90 is used, the number of members is increased as compared with the case where it is provided by application of ink or the like, but it becomes easy to use only a necessary amount in a necessary part. .

  Characteristically, the excretion indicator 90 extends in the front-rear direction along the side edge of the pocket 56P so that the entire front-rear range corresponding to the pocket 56P overlaps with the non-pocket part in the width direction. Exist. The part satisfying this condition may be provided over at least the front-rear direction range including the excretion position, and should be provided over 50% or more, particularly 80% or more of the front-rear direction range where the excretion display unit 90 is disposed. Is preferred. Therefore, for example, as shown in FIG. 9, the defecation position and the entire front side thereof satisfy the above-described conditions, and the portion behind the defecation position passes through the pocket 56P in the front-rear direction without satisfying the above-described conditions. Can be adopted. Further, when a plurality of excretion display portions 90 are provided, as long as at least one of them is formed so as to satisfy the above condition, at least one other does not satisfy the above condition as shown in FIG. There may be.

  The interval (width direction) between the excretion display part 90 and the side edge of the pocket 56P adjacent to the excretion display part 90 can be determined as appropriate according to the correlation between the amount of urination and discoloration. In particular, the thickness is preferably about 0 to 5 mm. Further, this interval may be constant over the entire front-rear direction of the excretion display portion 90 or the pocket 56P, or may change.

  As long as the above conditions are satisfied, the shape of the excretion display unit 90 may be a long shape such as a straight line or a wavy line, a wide shape such as a triangle or a quadrangle, or a design such as a character or a pattern, not a figure shape. It can be determined as appropriate. The excretion display unit 90 may have a shape different from the pocket 56P in addition to a shape parallel to the pocket 56P as illustrated.

In addition, as long as the above conditions are satisfied, the length and position of the excretion display unit 90 can be determined as appropriate. However, the overall length of the diaper is L, and the center of the diaper front and rear is separated from the front end of the excretion display unit. When the distance is DA and the distance in the front-rear direction between the center of the diaper front-rear direction and the rear end of the excretion indicator is DB,
0.3L / 2 ≤ DA ≤ 0.5L / 2
0.3L / 2 ≦ DB ≦ 0.5L / 2
Is preferred.
Although the width | variety of the excretion display part 90 can be determined suitably, it is suitable to make it thin, specifically about 1-5 mm.

  In the diaper thus configured, even if the amount of urination is small, the pocket 56P diffuses along the front-rear direction and is supplied to the back side of the non-pocket portion near the side edge of the pocket 56P. The color is supplied to the display unit 90 to cause discoloration. In addition, since the excretion display part 90 is partially or entirely hidden behind the non-pocket part, it is difficult to come into contact with moisture in the air, and even if the part near the pocket 56P is discolored, it is completely discolored as a whole. Such a situation is unlikely to occur.

On the other hand, although the above-mentioned excretion display part 90 is a thing which is hard to discolor with the water | moisture content in air, it is easy to discolor compared with the thing which does not have the pocket 56P. Therefore, in order to improve this, as shown in FIG. 12, the part 58b located in the back side of the absorber 56 is made water-repellent as shown in FIG. 12, or as shown in FIG. A water-repellent sheet 95 is provided between the portion located on the back side of the body 56 and the excretion display unit 90. In the former case, as shown in the illustrated example, the packaging sheet 58 is formed separately on the front side and the back side of the absorbent body 56, and only the back side portion is water-repellent , or as in the example shown in FIG. Only the part located on the back side of the absorbent body 56 in the integrally formed packaging sheet 58 may be subjected to water repellent treatment. As the base material of the water-repellent sheet 95 in the latter case, the same material as the liquid-impermeable sheet 11 can be used in addition to the liquid-permeable material such as paper such as crepe paper and nonwoven fabric.
Thus, the water repellent portions 58b and 95 that cover the surface side of the excretion display portion 90 are provided, and the excreted liquid that has permeated through the absorber 56 permeates or wraps around the water repellent portions 58b and 95 and reaches the excretion display portion 90. When configured to do so, the effect of preventing discoloration due to moisture in the air is significantly improved.

  Further, the above-described transmission hole H is formed in a predetermined range including a portion overlapping the pocket 56P of the topsheet 30, and the portion overlapping the pocket 56P of the topsheet 30 is not joined to a member adjacent to the lower side thereof, Or it is also a preferable form that it joins in part except the center part of the width direction, and forms the accommodation space which continues from the back surface of the surface sheet 30 to the inside of the pocket 56P. When sheets such as the intermediate sheet 40 and the packaging sheet 58 exist between the absorbent body 56 and the top sheet 30 as shown in the figure, these intermediate members are recessed in the pocket 56P, thereby An accommodation space is formed. As shown in FIG. 1, in the case where one or a plurality of transmission hole rows formed in a row in the front-rear direction are formed in the width direction, the transmission holes H are slits as described above. In the case of forming by formation and its enlargement, at least one row of transmission hole rows is disposed so as to pass over the pocket 56P, and both side portions of one or more rows of transmission hole rows passing over the pocket 56P are disposed below it. If it joins to the member adjacent to the side, collapse of the accommodation space by the fall of the top sheet 30 into the pocket 56P is suppressed, and the transmission hole H communicating with the accommodation space is also difficult to close, which is preferable.

  By adopting such a structure, excretion fluid such as urine and watery stool is rapidly supplied to the accommodation space formed on the back side of the top sheet 30 through the permeation hole H. In addition, an excellent discoloration effect on the excretion of watery stool and watery stool can be obtained, and the reversion of housed urine and watery stool can be reduced. Of course, unlike the illustrated embodiment, the entire member positioned on the surface side of the absorber 56 may be recessed in the pocket 56P (including the topsheet 30).

  The present invention is applicable to disposable diapers such as a pants type, a tape type, and a pad type.

It is an expanded state top view of a tape type disposable diaper. FIG. 2 is a sectional view taken along line 2-2 of FIG. FIG. 3 is a sectional view taken along line 3-3 in FIG. 1. It is an enlarged plan view which shows only the principal part. It is a top view which shows only the principal part. It is a top view which shows only the principal part in another form. It is an enlarged plan view which shows only the principal part in another form. It is an enlarged plan view which shows only the principal part in another form. It is an enlarged plan view which shows only the principal part in another form. It is a top view showing an example of arrangement of various penetration holes. It is the schematic of a diaper mounting state. It is sectional drawing equivalent to the 2-2 cross section of FIG. 1 in another form. It is sectional drawing equivalent to the 2-2 cross section of FIG. 1 in another form.

  DESCRIPTION OF SYMBOLS 10 ... Width direction center part, 11 ... Liquid impervious sheet, 12 ... Exterior sheet, 30 ... Top sheet, 31 ... Width direction center area, 32 ... Left middle area, Right middle area, 33 ... Left area, Right area, 34 ... side edge region, 40 ... intermediate sheet, 50 ... absorbent element, 52 ... fiber, 54 ... superabsorbent polymer particles, 56 ... absorbent, 58 ... packaging sheet, 60 ... barrier cuff, 64 ... barrier sheet, 80 DESCRIPTION OF SYMBOLS ... Holding sheet | seat, 90 ... Excretion display part, H ... Permeation hole, N1 ... Absorber narrow part, N2 ... Side part narrow part, P1, P2 ... Intersection, Z ... Defecation position.

Claims (5)

A liquid-permeable surface sheet;
A liquid impervious sheet;
Between the liquid-permeable surface sheet and the liquid-impermeable sheet, an absorber formed by an aggregate of absorbent materials interposed so as to extend from the ventral part to the dorsal part, and
A pocket formed of at least one of a low-weighted portion having a lower basis weight of absorbent material than the surroundings and a non-weighted portion having no absorbent material provided in the absorber;
An excretion display unit that is provided between the absorber and the liquid-impermeable sheet and changes color by contact with excretory liquid;
A disposable diaper with
The pocket extends in an elongated shape along the front-rear direction so as to include the excretion position in the widthwise center of the absorber,
The excretion display part is configured such that a part extending in the front-rear direction along the side edge of the pocket is defined as the excretion position so that a part or all of the width direction overlaps with a non-pocket part located beside the pocket. It has in the front and rear direction range including,
Covers the surface side of the excretion display part, and has a water-repellent part that prevents the excretion display part from being discolored due to moisture in the air or stuffiness in the diaper only on the back side of the absorber, and passes through the absorber. The excreted liquid component is configured to reach the excretion display part by wrapping around the water-repellent part,
A disposable diaper characterized by that. When the total length of the diaper is L, the front-rear distance between the center of the diaper and the front end of the excretion indicator is DA, and the front-rear distance between the center of the diaper and the rear end of the excretion indicator is DB ,
0.3L / 2 ≤ DA ≤ 0.5L / 2
0.3L / 2 ≦ DB ≦ 0.5L / 2
The disposable diaper according to claim 1, wherein When the front-rear direction length of the excretion display unit and Y _1, the length of the pocket and Y _2,
0.5Y ₁ ≦ Y ₂ ≦ 1.5Y ₁
And the disposable diaper of Claim 2 with which 50% or more of the front-back direction range in which the said excretion display part is arrange | positioned overlaps with the front-back direction range in which the said pocket is arrange | positioned.   The topsheet has a large number of transmission holes in a predetermined range including a portion overlapping with the pocket, and the portion overlapping with the pocket is not joined to a member adjacent to the lower side at least in the center in the width direction. The disposable diaper of any one of Claims 1-3 in which the accommodation space which continues from the back surface of the said surface sheet to the inside of the said pocket is formed. The absorbent material is pulp fiber and superabsorbent polymer,
The absorbent body is wrapped by a liquid-permeable packaging sheet,
The excretion indicator is a liquid-impervious hot melt adhesive containing a color-changing substance that changes color by contact with excretory liquid, ink that changes color by contact with excretion components, or ink that dissolves by contact with excretion components. It is formed by being applied to the absorbent body side of the adhesive sheet,
The disposable diaper of any one of Claims 1-4.

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