JP7289689B2 - Tape type disposable diaper - Google Patents

Description

TECHNICAL FIELD The present invention relates to an absorbent article that absorbs bodily fluids, particularly a tape-type disposable diaper.

Absorbent articles, particularly disposable diapers for newborns, are prone to loose stool leakage.
Factors of leakage include physical factors of the disposable diaper product itself and human factors.

As countermeasures to overcome the above-mentioned physical factors, a feces pocket is provided and a drug is applied to the top sheet to improve the passage of loose feces.
On the other hand, as a human factor, there are cases where beginners who are not accustomed to wearing disposable diapers (such as mothers and fathers who have given birth to their first child) are unable to wear disposable diapers in the appropriate position.

In Patent Literature 1, a colored figure is printed on the back sheet at the crotch portion of the side flaps to serve as a mark for wearing the garment at an appropriate position, which can be visually recognized from the skin side.

JP 2014-144050 A

In Patent Document 1, "the crotch portion of the side flap" is used as an index for the appropriate mounting position, and it is thought that loose stool is likely to leak from the dorsal side, and that this is not taken into consideration.
In addition, it is thought that colored figures have nothing to do with absorbability of loose stools.

Therefore, the main object of the present invention is to provide a tape-type disposable diaper that can prevent or suppress the leakage of feces from the back side by forming an indicator for the appropriate wearing position of the tape-type disposable diaper. to do.

The main aspects of the tape-type disposable diaper that solves the above problems are as follows.
A tape-type disposable diaper having a liquid-retaining absorbent body and a liquid-permeable topsheet on the skin-facing side of the absorbent body,
an intermediate sheet for transferring bodily fluids permeating through the top sheet to the absorbent body;
On the back side of the tape-type disposable diaper , a colored glycerin-based bodily fluid absorbent visible through the top sheet is provided in an indicator region extending from at least the back edge of the absorbent body toward the center in the front-rear direction. provided on the intermediate seat,
A tape-type disposable diaper characterized by:

In disposable diapers, loose stools are especially prone to leak from the dorsal side. It has been found that one of the reasons for this leakage is that the wearer's buttocks and waist region is not positionally aligned with the dorsal side of the absorbent.
However, according to the first aspect, the intermediate sheet is provided with an absorbent for colored bodily fluids that is visible through the top sheet in at least the indicator region extending from the dorsal edge of the absorbent body toward the center in the front-rear direction. In addition, it is possible to perform alignment with the indicator area while lying on one's back, and for example, the alignment can be completed by hiding the indicator area by the wearer.
Such alignment is easy even for beginners who are not accustomed to wearing disposable diapers.
In addition, instead of simply applying a coloring agent, a colored body fluid absorber that can be seen through the top sheet is used, so that the absorption of body fluid can be promoted and migration to the absorbent side can be promoted. Combined with the function of wearing tape type disposable diapers at the appropriate position, it is highly practical.

As the intermediate sheet according to the present invention, there is a form having a second sheet on the side of the top sheet and a packaging sheet for wrapping the absorbent body.
Moreover, there exists a form which has the 3rd sheet|seat between the said 2nd sheet|seat and the said packaging sheet.
In these cases, the second sheet may be provided with the absorbent, the third sheet may be provided with the absorbent, the packaging sheet may be provided with the absorbent, and a plurality of sheets may be provided with the absorbent.
Particularly preferred is a form in which the second sheet is provided with an absorbent.

The top sheet is preferably made of a non-woven fabric having a large number of pores in order to increase the absorbability of body fluids such as loose stools.

As the absorbent, one containing a hydrophilic chemical solution is desirable. For example, it is preferable to use glycerin as the main component composition. For example, the absorbent may contain 70% by mass or more of glycerin and one or more additives selected from the group consisting of emulsifiers, phosphate esters, paraffins and surfactants.

As shown in the examples below, when an absorbent mainly composed of glycerin is provided on an intermediate sheet between the top sheet and the absorbent body for transferring the body fluids permeated through the top sheet to the absorbent body, body fluids can be absorbed. It has been found that (for example, loose stool) can be quickly absorbed into the absorber.
When such an absorbent functions to absorb bodily fluids quickly into the absorbent body, clogging of the topsheet by feces components is reduced, and rough skin of the wearer, especially rash, is often a problem, which is prevented or reduced. .

The wearer's skin becomes rough, especially rashes, as factors such as friction with the skin when the diaper is worn, body fluids associated with wearing the diaper for a long time, and irritation to the skin from excrement (urine and loose stools). The factor of irritation due to prolonged contact of the skin with loose feces is particularly large. In order to suppress this, the diaper should quickly absorb the loose stool into the absorber. If loose stool can be quickly absorbed by the absorber of the diaper, it not only reduces irritation to the skin but also helps prevent leakage from the legs and back.
The first factor that inhibits the absorption of loose feces through the topsheet is that when fecal components permeate the topsheet, the components that cannot permeate remain on the surface of the fibers that make up the topsheet, clogging the topsheet. It is to be. Secondly, the defecation speed exceeds the absorption speed of the diaper, and the material cannot be absorbed and remains on the top sheet.
Remaining loose stool ingredients on the topsheet may result in loose stool ingredients sliding on the topsheet and resulting in stool leakage.
Therefore, it is extremely important for the diaper to quickly absorb loose stools into the absorber, and here is the technical significance of providing the absorbent in the intermediate sheet according to the present invention.

When the absorbent article is a disposable pad placed on the use side of a disposable diaper, it is difficult to distinguish between the front and back due to its shape.
Therefore, it is desirable that one side of the disposable pad in the front-rear direction has a display indicating that the back side is the back side.

According to the present invention, it is possible to prevent or suppress the leakage of stool from the back side by forming an indicator for the appropriate wearing position of the tape-type disposable diaper .

Fig. 2 is a plan view showing the inner surface of the tape-type disposable diaper when the diaper is unfolded; Fig. 2 is a plan view showing the outer surface of the tape-type disposable diaper when the diaper is unfolded; FIG. 2 is a central cross-sectional view in the front-rear direction of FIG. 1; FIG. 2 is a front-rear end cross-sectional view of FIG. 1; FIG. 3 is an explanatory diagram of a main part of Example 1 of the embodiment; FIG. 10 is an explanatory diagram of a main part of example 2 of the embodiment; FIG. 11 is an explanatory diagram of a main part of Example 3 of the embodiment; FIG. 4 is an explanatory diagram of a main part of the embodiment; FIG. 4 is a plan view of a first index example; FIG. 11 is a plan view of a second indicator example;

<Configuration example of disposable diaper>
Configuration examples of a tape-type disposable diaper as an absorbent article of the present invention are shown in FIGS. 1 to 5. FIG.
An example of a disposable diaper is shown, the symbol X in the figure indicates the total width of the diaper excluding the connecting tape, the symbol L indicates the total length of the diaper, and the dotted pattern portions in the cross-sectional view are the front side and the back side. A hot-melt adhesive is shown as a joining means for joining the constituent members located in .
The hot melt adhesive is applied by known methods such as slot coating, continuous line or dotted line bead coating, spiral or Z-shaped spray coating, or pattern coating (transfer of hot melt adhesive by letterpress method). can be applied. Alternatively or additionally, at the fixing portion of the elastic member, a hot melt adhesive can be applied to the outer peripheral surface of the elastic member to fix the elastic member to the adjacent member. Hot-melt adhesives include, for example, EVA-based, adhesive rubber-based (elastomer-based), olefin-based, and polyester-polyamide-based adhesives, and can be used without particular limitation. As a joining means for joining each constituent member, a means by material welding such as heat sealing or ultrasonic sealing can be used.

This tape-type disposable diaper has a crotch portion including the center in the front-rear direction LD, an abdominal portion F extending forward from the center in the front-rear direction LD, and a back portion B extending rearward from the center in the front-rear direction LD. are doing.
This tape-type disposable diaper includes an absorbent body 56 built in a region including the crotch portion, a liquid-permeable top sheet 30 covering the front side of the absorbent body 56, and a liquid-impermeable sheet 11 covering the back side of the absorbent body 56. and an exterior nonwoven fabric 12 that covers the back side of the liquid-impermeable sheet and constitutes the outer surface of the product.

On the other hand, on both sides in the width direction from the ventral portion F to the dorsal portion B, side flap portions SF having no absorber 56 are formed. has 13. The connecting tape 13 is connected to the outer surface of the ventral portion F in the mounted state. The illustrated tape-type disposable diaper also has a pair of end flap portions EF that do not have the absorbent body 56 and extend to the front and rear sides of the absorbent body 56, respectively.

The materials and characteristic parts of each part will be described in order below.
(Absorber)
The absorbent body 56 is a part that absorbs and retains the excreted fluid, and can be formed by an assembly of fibers. The filament assembly may be a filament assembly obtained by laminating short fibers such as cotton pulp or synthetic fibers, or by opening tows (fiber bundles) of synthetic fibers such as cellulose acetate as necessary. can also be used. The fiber basis weight can be, for example, about 100 to 300 g/m ² when piling up cotton pulp or short fibers, and for example, about 30 to 120 g/m ² for filament aggregates. can be done. The fineness of synthetic fibers is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, more preferably 1 to 5 dtex. In the case of a filament assembly, the filaments may be non-crimped fibers, but crimped fibers are preferred. The degree of crimping of the crimped fibers can be, for example, about 5 to 75, preferably 10 to 50, more preferably 15 to 50 per 2.54 cm. Further, uniformly crimped crimped fibers can be used.

(superabsorbent polymer particles)
Absorbent body 56 may contain superabsorbent polymer particles in part or in its entirety. Superabsorbent polymer particles include "powder" in addition to "particles". As the superabsorbent polymer particles 54, those used in this type of absorbent article can be used as they are. Although the particle size of the superabsorbent polymer particles is not particularly limited, for example, sieving using a 500 μm standard sieve (JIS Z8801-1: 2006) (shaking for 5 minutes), and particles falling under the sieve in this sieving When sieving (shaking for 5 minutes) using a 180 μm standard sieve (JIS Z8801-1: 2006), the percentage of particles remaining on the 500 μm standard sieve is 30% by weight or less, and the 180 μm standard sieve It is desirable that the proportion of particles remaining on the top is 60% by weight or more.

Materials for the superabsorbent polymer particles may be used without any particular limitation, but those having a water absorption of 40 g/g or more are suitable. Superabsorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based particles. and acrylic acid (salt) polymers can be used. As for the shape of the superabsorbent polymer particles, the powder particles that are commonly used are suitable, but other shapes can also be used.

As the superabsorbent polymer particles, those having a water absorption rate of 70 seconds or less, particularly 40 seconds or less are preferably used. If the water absorption rate is too slow, the liquid supplied into the absorbent body 56 tends to return to the outside of the absorbent body 56, which is called reversion.

As the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. As a result, even when the absorbent body 56 is bulky, it is possible to effectively suppress the feeling of stickiness after liquid absorption.

The basis weight of the superabsorbent polymer particles can be appropriately determined according to the absorption amount required for the use of the absorbent body 56 . Therefore, although it cannot be generalized, it can be 50 to 350 g/m ² . If the weight per unit area of the polymer is less than 50 g/m ² , it becomes difficult to secure the absorption amount. If it exceeds 350 g/m ² , not only is the effect saturated, but the superabsorbent polymer particles are in excess, giving a gritty feeling of discomfort.

(packaging sheet)
In order to prevent the superabsorbent polymer particles from slipping out or to improve the shape retention of the absorbent body 56, the absorbent body 56 can be incorporated as an absorbent element 50 wrapped with a wrapping sheet 58. FIG. As the wrapping sheet 58, tissue paper, especially crepe paper, nonwoven fabric, poly-laminated nonwoven fabric, a sheet with small holes, or the like can be used. However, it is desirable that the sheet is such that the superabsorbent polymer particles do not escape.
Here, when the hydrophilic chemical solution is applied to tissue paper, especially crepe paper, non-woven fabric is desirable because of its high permeability. When nonwoven fabric is used instead of crepe paper, hydrophilic SMS or SMMS (spunbond/meltblown/meltblown/spunbond) nonwoven fabric is particularly suitable, and polypropylene, polyethylene/polypropylene, etc. can be used as the material. The fiber basis weight is preferably 5 to 40 g/m ² , particularly 10 to 30 g/m ² .

As shown in FIG. 3, the packaging sheet 58 may have a structure in which a single sheet wraps the entire absorbent body 56, or a plurality of sheets, such as two upper and lower sheets, may wrap the entire absorbent body 56. 58 can also be omitted.

(top sheet)
The top sheet 30 is liquid-permeable, and may be, for example, a perforated or non-perforated nonwoven fabric, a porous plastic sheet, or the like. In addition, among these, the nonwoven fabric is not particularly limited as to what the raw material fibers are. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters, and polyamides, regenerated fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of these. etc. can be exemplified. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of processing methods include known methods such as spunlace, spunbond, thermal bond, meltblown, needle punch, air through, and point bond methods. For example, if flexibility and drapeability are desired, the spunlace method is preferable, and if bulkiness and softness are desired, the thermal bond method is the preferable processing method.

The top sheet 30 extends from the front end to the rear end of the product in the front-rear direction, and extends laterally from the absorbent body 56 in the width direction WD. If necessary, such as when the top sheet 30 is located on the center side in the width direction, the width of the top sheet 30 may be made shorter than the total width of the absorbent body 56, and other suitable modifications may be made.

(intermediate sheet)
An intermediate sheet (also called a “second sheet”) 40 having a faster liquid permeation rate than the top sheet 30 can be provided in order to quickly transfer the liquid that has permeated the top sheet 30 to the absorbent body. The intermediate sheet 40 is intended to quickly transfer the liquid to the absorbent body to enhance the absorption performance of the absorbent body, and to prevent the "return" phenomenon of the absorbed liquid from the absorbent body. The intermediate sheet 40 can also be omitted.

Examples of the intermediate sheet 40 include materials similar to those of the top sheet 30, spunlace nonwoven fabric, spunbond nonwoven fabric, SMS nonwoven fabric, pulp nonwoven fabric, mixed sheet of pulp and rayon, pointbond nonwoven fabric, and crepe paper. In particular, an air-through nonwoven fabric is preferred because it is bulky. Composite fibers having a core-sheath structure are preferably used for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. The basis weight is preferably 17-80 g/m ² , more preferably 25-60 g/m ² . The thickness of the raw fibers of the nonwoven fabric is preferably 2.0 to 10 dtex. In order to make the non-woven fabric bulky, it is also preferable to use eccentric fibers, hollow fibers, or eccentric and hollow fibers whose core is not in the center as mixed fibers of all or part of the raw material fibers.

The intermediate sheet 40 in the illustrated example is shorter than the width of the absorbent body 56 and arranged in the center, but it may be provided over the entire width. Further, the intermediate sheet 40 may be provided over the entire length of the diaper, or may be provided only in the intermediate portion including the excretion position as shown in the illustrated example.

(liquid-impermeable sheet)
The liquid-impermeable sheet 11 is not particularly limited, but preferably has moisture permeability. As the liquid-impermeable sheet 11, for example, an inorganic filler is kneaded in an olefin resin such as polyethylene or polypropylene, the sheet is molded, and then the sheet is stretched in a uniaxial or biaxial direction. A sheet can be preferably used. Moreover, as the liquid-impermeable sheet 11, a non-woven fabric as a base material with improved waterproofness can also be used.

It is desirable that the liquid-impermeable sheet 11 extends in the same or wider range than the absorbent body 56 in the front-rear direction LD and the width direction WD. A structure in which the end portions of the absorber 56 are not covered in the front-rear direction LD and the width direction WD may also be employed.

(exterior non-woven fabric)
The exterior nonwoven fabric 12 covers the entire back side of the liquid-impermeable sheet 11 to give the outer surface of the product a cloth-like appearance. The exterior nonwoven fabric 12 is not particularly limited, and examples of raw material fibers include olefin-based, polyester-based, and polyamide-based synthetic fibers such as polyethylene or polypropylene, regenerated fibers such as rayon and cupra, and natural fibers such as cotton. A spunlace method, a spunbond method, a thermal bond method, an air through method, a needle punch method, or the like can be used as a processing method. However, spunbond nonwoven fabrics, SMS nonwoven fabrics, SMMS nonwoven fabrics, and other long-fiber nonwoven fabrics are suitable because they can achieve both good texture and strength. The non-woven fabric can be used singly or in multiple layers. In the latter case, it is preferable to bond the nonwoven fabrics together with a hot-melt adhesive or the like. When non-woven fabric is used, its fiber basis weight is preferably 10 to 50 g/m ² , particularly 15 to 30 g/m ² .

(Getting up gathers)
On both sides of the top sheet 30 in the width direction WD, rise gathers 60 standing up toward the wearer's skin are provided in order to prevent excrement from moving laterally along the top sheet 30 and prevent so-called side leakage. preferably. Of course, the rising gathers 60 can be omitted.

When adopting the rising gathers 60, the structure is not particularly limited, and any known structure can be adopted. The illustrated rising gathers 60 are composed of a gathering sheet 62 substantially continuous in the width direction WD, and an elongated gathering elastic member 63 fixed to the gathering sheet 62 in a stretched state along the front-rear direction LD. ing. As the gather sheet 62, a water-repellent nonwoven fabric can be used, and as the gather elastic member 63, thread rubber or the like can be used. The elastic member may be provided in a plurality of pieces as shown in FIGS. 1 and 2, or may be provided in a single piece.

The inner surface of the gather sheet 62 has a joining start end in the width direction WD on the side of the top sheet 30, and the portion outside the joining end in the width direction is the inner surface of each side flap portion SF, that is, the liquid impermeable in the illustrated example. The nonwoven fabric 12 is bonded to the side of the adhesive sheet 11 and to the side of the exterior nonwoven fabric 12 positioned on the outside in the width direction thereof with a hot-melt adhesive or the like.

Around the legs, the width direction inner side from the joining start end of the rising gathers 60 is fixed on the top sheet 30 at both ends in the front and back direction of the product, but the portion in between is a non-fixed free portion. It rises due to the contractile force of the elastic member 63 and comes to adhere to the surface of the body.

(flat gather)
A side elastic member 64 made of an elongated elastic member such as rubber thread is fixed to each side flap portion SF while being stretched along the front-rear direction LD. is constructed as a planar gather. As shown in the figure, the leg elastic members 64 are provided between the gathered sheet 62 and the liquid-impermeable sheet 11 on the outside in the width direction near the joining start end of the joined portion of the gathered sheet 62. It can also be provided between the liquid-impermeable sheet 11 and the exterior nonwoven fabric 12 in the SF. A plurality of leg-surrounding elastic members 64 may be provided on each side as in the illustrated example, or only one leg-surrounding elastic member 64 may be provided on each side.

(connecting tape)
The dorsal portion B is provided with a connecting tape 13 as a connecting means that is detachably connected to the outer surface of the ventral portion F, respectively. When wearing the diaper, the connecting tape 13 is wrapped around the outer surface of the abdominal portion F from both sides of the waist, and the connecting portions 13A of the connecting tape 13 are connected to the outer surface of the abdominal portion F at appropriate locations.

Although the structure of the connecting tape 13 is not particularly limited, it has a tape main body portion protruding from the tape mounting portion 13C and a connecting portion 13A provided in the middle portion in the width direction. ing. The shape of the connecting tape 13 is also not particularly limited, but the tape attachment portion 13C may have the longest and constant portion in the front-rear direction, and the tape main portion may have a tapered shape that tapers toward the tip. can.

As the connection portion 13A, a hook member (male member) of a mechanical fastener (surface fastener) may be provided, or an adhesive layer may be provided. The hook material has a large number of engaging projections on its connection surface, and the shapes of the engaging projections are (A) square-shaped, (B) J-shaped, (C) mushroom-shaped, and (D). Although there are a T shape, (E) a double J shape (a shape in which two J shapes are joined back to back), and the like, any shape may be used.

Further, as the sheet base material forming the tape attachment portion 13C to the tape body portion, nonwoven fabric, plastic film, poly-laminated nonwoven fabric, paper, or a composite material thereof can be used. A spunbond nonwoven fabric, an air-through nonwoven fabric, or a spunlaced nonwoven fabric having a basis weight of 20 to 100 g/m ² and a thickness of 1 mm or less is preferable.

(Target part)
It is preferable to provide a target portion at a connecting portion of the connecting tape 13 in the ventral portion F. As shown in FIG. The target portion can be provided by attaching a target sheet 20 to the outer surface of the ventral portion F for facilitating connection, as shown in the illustrated example. When the connecting portion 13A is a hook material, the target sheet 20 may be one in which a large number of loop threads are provided on the surface of the sheet base material made of a plastic film or nonwoven fabric so that the engaging projections of the hook material can be entangled. Further, in the case of the adhesive layer, a sheet substrate made of a plastic film having a smooth surface and having high adhesiveness and having a release treatment applied to the surface thereof can be used. In addition, when the connecting portion of the connecting tape 13 in the ventral portion F is made of nonwoven fabric, for example, when the outer nonwoven fabric 12 is provided as shown in the figure, the target sheet 20 is omitted and the hook material is used as the fiber of the outer nonwoven fabric 12. It can also be tangled and connected. In this case, a target sheet 20 as a mark may be provided between the outer nonwoven fabric 12 and the liquid-impermeable sheet 11, or a mark may be printed on the outer surface of the outer nonwoven fabric 12 or the liquid-impermeable sheet 11.

<Absorbent>
An embodiment of the present invention will now be described.
In the embodiment, an intermediate sheet for transferring the body fluid permeating the top sheet 30 to the absorbent body 56 is provided with a colored body fluid absorbent Q that can be visually recognized through the top sheet 30 .

As shown in FIG. 5, which schematically shows only the main part, the intermediate sheet, which is located between the top sheet 30 and the absorbent body 56 and transfers body fluids that have permeated the top sheet 30 to the absorbent body 56, is mainly made of, for example, glycerin. When the absorbent Q is provided, body fluids (for example, loose stools) can be quickly absorbed by the absorbent body 56, as shown in Examples described later.

As the intermediate sheet according to the present invention, in addition to the second sheet 40 positioned on the side of the top sheet 30 shown in FIGS.
Furthermore, as shown in FIG. 8, in addition to the second seat 40, a third seat 41 may be provided.

In addition to providing the second sheet 40 with the absorbent Q, the top sheet 30 can be provided with the absorbent Q.
In this case, it is desirable to provide the absorbent Q on the non-skin side of the top sheet 30 (lower surface in FIG. 6) as shown in FIG.
It is preferable that the skin side of the top sheet 30 (upper surface in FIG. 6) is hydrophobic in order to increase the diffusibility of body fluid components. This form is less preferred as it would interfere with the hydrophobicity of 30.
On the other hand, when the absorbent Q is provided on the non-skin side of the top sheet 30 (lower side in FIG. 6), the absorbent Q provided on the non-skin side of the top sheet 50 is absorbed at the stage when body fluids are about to permeate the top sheet 50. It is considered that the effect of improving the absorption speed is enhanced by transferring Q to the intermediate sheet 40 side.

Since the top sheet 30 is made of a non-woven fabric having a large number of pores, body fluids are easily absorbed, and as a result, the effect of improving the absorption speed by the absorbent Q is enhanced.
The pores of the non-woven fabric can be of an appropriate shape such as a circle or an ellipse. The aperture diameter (equivalent diameter in the case of an ellipse) is desirably 0.1 to 2.0 mm. Also, the arrangement of the apertures is, for example, a zigzag pattern or a lattice pattern. The aperture ratio is desirably 2 to 40%. If the pore diameter and opening ratio are small, the permeability to body fluids tends to be insufficient. If the pore size and opening ratio are excessively large, there is a possibility that the bodily fluid once absorbed by the absorbent element will return to the surface of the top sheet.

As described above, the intermediate sheet according to the present invention may include the second sheet 40 positioned on the top sheet 30 side, and the packaging sheet 58 for wrapping the absorbent body 56 . That is, the absorbent Q can be provided on the skin side of the packaging sheet 58 .

Under this aspect, the topsheet 30 may additionally be provided with an absorbent Q, preferably on the non-skin side, as shown in FIG.
In the case where the sheet on which the absorbent Q is arranged has a plurality of layers, it is desirable to provide a gradient in the coating amount of the absorbent Q, for example, as follows. The reason why this aspect is preferable is that the gradient of the amount of application is related to the migration speed of the body fluid by the absorbent Q.
Top Sheet<<Intermediate Sheet<Packaging Sheet When the third sheet is provided, the following relationship is preferable.
Top sheet<Intermediate sheet<Third sheet<Packaging sheet As for the coating amount, taking the second sheet 40 as an example, it is preferably 0.02 g/m ² or more, and more preferably 0.05 g/m ² or more. preferably 3.00 g/m ² or less, more preferably 1.50 g/m ² or less, specifically 0.05 g/m ² or more and 1.20 g/m ² or less It is preferable to

As the absorbent according to the present invention, one containing a hydrophilic chemical component is preferable. For example, it is mainly composed of glycerin, and particularly contains glycerin in an ingredient composition of 70% by mass or more, more preferably 85% by mass or more, and additives such as emulsifiers, phosphate esters, glycerin fatty acid esters, paraffin and surfactants. It can be an embodiment containing one or more additives selected from the group.
As the surfactant, ether type nonionic surfactants and nonionic surfactants including EO/PO type are preferred.

In arranging the absorbent, when the top sheet and the intermediate sheet are bonded with a hot-melt adhesive in a striped or spiral shape, the absorbent extends in the front-rear direction at intervals in the width direction of the absorbent article. A striped application is preferred. When the top sheet and the intermediate sheet are joined by thermal embossing, it may be applied in stripes or spirals, or may be sprayed over the entire target area.
On the other hand, when the absorbent is provided on the non-skin surface of the top sheet 30, for example, the absorbent is only applied to the intermediate sheet 40, and the compressive force received during packaging or storage of the absorbent article, or during use by the wearer. Compressive forces may be used to transfer a portion of the absorbent to the non-skin surface of the topsheet 30 for application.

(Wearing index)
The present invention intends to use the area of application of the absorbent for colored body fluids as an index to determine the proper position for wearing a disposable absorbent article or a tape-type disposable diaper.

As such an index region, for example, as shown in FIGS. 9 and 10, on the back side of the absorbent article, the region extending from at least the back edge 56b of the absorbent body 56 toward the central side in the front-rear direction is designated as the index region TZ. can be done.
The range of the longitudinal length a of the index region TZ is AL/3.5 to AL/2.0 from at least the dorsal edge 56b of the absorbent body 56, with the longitudinal length AL of the absorbent body 56 as a reference. is desirable.
If it is too short, it will be difficult to visually recognize it as an index. For example, if it is too long, such as reaching the ventral side, it will be difficult to visually recognize it as an index, and it will give the user a sense of discomfort, which is not desirable.
The width direction length b range of the index region TZ is affected by the material to which the absorbent Q is applied, and the width of at least the intermediate sheet of the absorbent body 56 is the shortest, and the width of the absorbent body packaging sheet is the longest. In any case, the width direction length b of the index region TZ is preferably AW/2.5 to AW/1.5 with the width AW of the absorbent body 56 as a reference.
The absorber may have a shape other than a rectangle, such as an hourglass shape. It may have unevenness in the center in the length direction or a dent in the width direction. Based on these, the length a in the front-rear direction and the length b in the width direction are based on the longest numerical values of the length AL in the front-rear direction and the length AW in the width direction of the absorbent body 56 .

Although there is no limitation on the width direction length of such an indicator region, it is desirable that it is located between the central side edges of the rising gathers 60 , 60 .
As for the form of application of the absorbent Q, intermittent application such as stripes is desirable instead of application over the entire surface. This is because, for example, if the entire surface of the second sheet is coated with a hydrophilic chemical, diffusion in the front-rear direction may be hindered.

As a specific application form of the absorbent Q, FIG. 9 shows a form of oblique lattice-like stripes. FIG. 10 shows vertical stripes extending in the front-rear direction.
The dimensions of the oblique lattice-like stripes are preferably 2 mm to 5 mm in width per stripe, and 50 mm to 70 mm in width and 100 mm to 120 mm in length on the entire surface, assuming the size of a newborn baby. The dimensions of the vertical stripes are preferably 2 mm to 10 mm in width per stripe, and 50 mm to 70 mm in width and 100 mm to 120 mm in length on the entire surface, assuming that they are the size of a newborn.
In either form, alignment with the indicator region TZ can be performed while lying on one's back, and for example, alignment can be achieved by hiding the indicator region TZ by the wearer.
The configuration shown in FIG. 10 facilitates alignment in the width direction.

As for the sheet to be used as an absorbent for colored bodily fluids, it is desirable to use, for example, the second sheet, which is easier to see, than all of the second sheet, the third sheet and the packaging sheet.

Examples are given below.
(Experimental example 1)
With the structure shown in FIGS. 1 to 4, three types of disposable diaper configurations in which the arrangement of the absorbent Q is changed as shown in FIGS. The absorbent property was examined by running down from above the top sheet. A disposable diaper with no absorbent was also prepared as a comparative example.
For a total of 4 types of disposable diapers, 5 samples were prepared for each and an absorption test was conducted.

Specifically, in the absorption test, the disposable diaper was placed in an unfolded state, a cylinder with a diameter of 7 cm was placed on the back side, and 20 ml of simulated soft stool was introduced into the diaper, and at the same time measurement of the absorption rate was started. The pseudo-loose stool begins to permeate the topsheet from the tube through the opening in the flat plate. After 30 seconds from the start of the absorption rate measurement, the tube is removed, and the measurement of the absorption rate is completed when it is confirmed that the moisture on the surface of the top sheet has disappeared.
Three minutes after the simulated soft stool was introduced, 10 sheets of filter paper (10 cm x 10 cm) were stacked on the back side of the disposable diaper, and a 1 kg weight (10 cm x 10 cm) was placed on top of the filter paper. Let the increment be the backtracking amount.
After that, dismantle the disposable diaper, cut out a measurement area of 8 cm in width × 15 cm in the front-back direction where the absorbent on the back side is present, and remove the liquid for each of the absorbent, packaging sheet, intermediate sheet (second sheet), and top sheet. The weight gain associated with absorption was calculated. In this case, since the weight of the measurement area is known, it can be calculated as a weight increment.
As the simulated soft stool, a known yoghurt-based simulated soft stool was used. Here, the mass ratio of 2 parts of commercially available yoghurt and 3 parts of ion-exchanged water was used, and the viscosity was adjusted to 300 mPa·s.

この結果から、中間シートに本発明に係る吸収剤を適用することにより、使い捨ておむつが軟便を素早く吸収体に吸収し、表面に軟便を残留させにくくすることに有効であることが判明した。 Table 1 shows the results of the absorption test of four types of disposable diapers.

From these results, it was found that by applying the absorbent according to the present invention to the intermediate sheet, the disposable diaper quickly absorbs loose feces into the absorber and is effective in making it difficult for loose feces to remain on the surface.

この結果から、本発明に係る吸収剤は、この技術分野で親水性の界面活性剤として使用されるものと比較して、吸収速度が高く、表面に軟便を残留させにくいものであることが判明した。 In addition, Table 2 shows the results of absorption tests in which the type of absorbent was changed. The results of Example 1 are reproduced in the table. As a comparison of absorbent Q different from glycerin, Comparative Example 2 is obtained by applying an ether-type nonionic surfactant in the form of FIG. Comparative Example 3 is obtained by applying a nonionic surfactant containing an EO/PO type to the embodiment of FIG.

From these results, it was found that the absorbent according to the present invention has a high absorption rate and does not easily leave loose stools on the surface compared to those used as hydrophilic surfactants in this technical field. bottom.

(Explanation of terms in the specification)
The following terms in the specification have the following meanings unless otherwise specified in the specification.
- The code|symbol "LD" shows the front-back direction of an absorbent article, and WD shows the width direction. The front-rear direction and the width direction are perpendicular to each other.

- "Unfolded state" means a flat unfolded state without contraction or slack.

- "Matsuke" is measured as follows. After pre-drying the sample or test piece, it is left in a test room or apparatus under standard conditions (test location: temperature 23±1° C., relative humidity 50±2%) to a constant weight. Pre-drying refers to making a sample or test piece constant weight in an environment at a temperature of 100°C. Fibers with an official moisture content of 0.0% do not need to be pre-dried. Using a sampling template (100 mm x 100 mm), a sample with dimensions of 100 mm x 100 mm is cut from the constant weight specimen. The weight of the sample is measured, multiplied by 100 to calculate the weight per square meter, and used as basis weight.

・If there is no description about environmental conditions for testing and measurement, the test and measurement shall be performed in a laboratory or equipment under standard conditions (test location: temperature 23±1°C, relative humidity 50±2%). do.

INDUSTRIAL APPLICABILITY In addition to tape-type disposable diapers such as those described above, the present invention can be applied to general disposable wearable articles such as various disposable diapers such as pants-type and pad-type disposable diapers, sanitary napkins, and disposable wearable articles for swimming and playing in the water. It is a thing.

DESCRIPTION OF SYMBOLS 10... Leg circumference edge 11... Liquid-impermeable sheet 12... Exterior nonwoven fabric 13... Connection tape 20... Target sheet 30... Top sheet 40... Intermediate sheet 50... Absorbent element 56... Absorbent body 58 ... packaging sheet, 60 ... rising gather, 62 ... gathering sheet, B ... dorsal part, F ... ventral part, WD ... width direction, LD ... front-back direction, SF ... side flap part, AL ... absorbent length, TZ ... index area, Q ... absorbent.

Claims (5)

A tape having a liquid-retaining absorbent body and a liquid-permeable top sheet on the skin-facing side of the absorbent body, and connecting tapes detachably connected to the outer surface of the abdominal part on both sides of the dorsal part. A type disposable diaper ,
an intermediate sheet for transferring bodily fluids permeating through the top sheet to the absorbent body;
On the back side of the tape-type disposable diaper , a body fluid absorber mainly composed of colored glycerin that is visible through the top sheet is provided in an index region extending from the back edge of the absorbent body toward the center in the front-rear direction. is provided on the seat,
The length range of the indicator region in the front-rear direction is AL/3.5 to AL/, based on the length AL in the front-rear direction, which is the longest numerical value of the absorbent body, from the dorsal edge of the absorbent body. 2.0,
The width direction length range of the index region is set to AW/2.5 to AW/1.5 based on the width AW based on the longest numerical value of the absorbent body,
Further, the widthwise length range of the indicator region is between the edges on the central side of the riser gathers that stand up on the wearer's skin side provided on both sides in the widthwise direction,
A tape-type disposable diaper characterized by: 2. The tape-type disposable diaper according to claim 1, wherein the non-skin side of the top sheet is also provided with the absorbent. 2. The tape-type disposable diaper according to claim 1, wherein said top sheet comprises a non-woven fabric having a large number of openings. The intermediate sheet has a second sheet on the top sheet side, a packaging sheet that wraps the absorbent body, and a third sheet between the second sheet and the packaging sheet, and at least the third sheet is provided with the absorbent. The tape-type disposable diaper according to claim 1 , wherein the tape-type disposable diaper is 2. The absorbent according to claim 1, wherein the absorbent contains 70% by mass or more of glycerin as a component composition, and one or more additives selected from the group consisting of emulsifiers, phosphate esters, paraffins and surfactants as additives. Tape type disposable diaper .

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