JP2022093954A - Disposable diaper - Google Patents

Abstract

To provide a disposable diaper capable of suppressing diaper rash excellently.SOLUTION: A disposable diaper having a top sheet 30 constituting a using side surface, a liquid impermeable sheet provided on the rear surface side, and an absorption element interposed therebetween, is provided with lotion application areas Ma-Mc containing at least either of fatty acid or fatty alcohol and polyhydric alcohol on the top sheet 30.SELECTED DRAWING: Figure 12

Description

The present invention relates to disposable diapers.

Rough skin, especially rashes, is often a problem for absorbent articles, especially disposable diapers.
Factors for this include friction with the skin when wearing a diaper, body fluids, and irritation received by the skin from excrement (urine / loose stool).

In particular, in diapers worn by infants, the skin of infants is thinner than that of adults, and the amount of water, natural moisturizing factor (NMF), and sebum is small, so problems such as redness and rash Is likely to occur.

As a technique for preventing and alleviating such problems, a semi-solid or solid lotion is provided on the surface of the diaper in contact with the wearer, and the lotion is adhered to the wearer's buttocks at the time of wearing, and excrement is excreted. There is a technique (hereinafter referred to as Patent Document 1) for reducing the adhesion of such substances to the wearer.

Patent No. 3222470

However, in the technique of Patent Document 1, since the lotion agent is semi-solid or solid and has extremely high viscosity, it is difficult to apply it uniformly over a wide range, and the lotion is reliably transferred to a desired position on the wearer's skin. There was a risk that it would not be done. Furthermore, since the top sheet is coated with a semi-solid or solid lotion that reduces the adhesion of stool, highly fluid stools such as water stools and loose stool components cannot quickly permeate the top sheet instead of normal stools. There was a fear.
On the other hand, when a highly viscous liquid such as semi-solid or non-solid mineral oil is simply applied to the top sheet, absorption into the absorber is taken into consideration as described in the background technique column of Patent Document 1 above. It is necessary to apply it excessively, and there is a problem that a sticky feeling is strongly felt at the time of wearing.

Therefore, the main problem of the present invention is to further enhance the effect of reducing the adhesion, friction and water evaporation of excrement in disposable diapers, impart the effect of suppressing inflammation of injured skin, and give a feeling of stickiness in view of the above problems. Is to reduce.

Typical embodiments of the present invention that have solved the above problems are as follows.
<Representative aspect>
In a disposable diaper having a top sheet constituting the front surface on the use side, a liquid impermeable sheet provided on the back surface side, and an absorbing element interposed between them.
The top sheet has a lotion application area containing at least one of a fatty acid and a fatty alcohol and a polyhydric alcohol.
Disposable diapers featuring that.

According to the present invention, there is provided a disposable diaper which has an effect of reducing adhesion, friction and water evaporation of excrement, has an effect of suppressing inflammation of injured skin, and has less stickiness.

It is a top view which shows the inner surface of the tape type disposable diaper in the unfolded state. It is a top view which shows the outer surface of the tape type disposable diaper in the unfolded state. FIG. 3 is a sectional view taken along the line 3-3 of FIG. It is a cross-sectional view of 4-4 of FIG. (A) 5a-5a cross-sectional view of FIG. 1, (b) 5b-5b cross-sectional view of FIG. 1, and (c) 5c-5c cross-sectional view of FIG. It is an enlarged plan view of the main part which shows the example of the opening pattern of the top sheet or the cover nonwoven fabric. It is an enlarged plan view of the main part which shows the example of the opening pattern of another top sheet or a cover nonwoven fabric. It is a top view of the morphological example of the lotion agent application area. It is a schematic explanatory drawing of the transition form of a lotion agent application area. It is sectional drawing of the morphological example of the lotion agent application area. It is sectional drawing of the other form example of the lotion agent application area. It is a top view of the other form example of the lotion agent application area.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dotted pattern portion in the cross-sectional view shows an adhesive as a joining means for joining each component located on the front side and the back side thereof, and is a solid, bead, curtain, summit or spiral coating of hot melt adhesive, or a pattern coat. The fixed portion of the elastic stretchable member is formed by (transfer of hot melt adhesive by the letterpress method) or the like, or by coating the elastic stretchable member on the outer peripheral surface of the elastic stretchable member such as comb gun or sure wrap coating instead of or together with this. It is a thing. Examples of the hot melt adhesive include EVA type, adhesive rubber type (elastomer type), olefin type, polyester / polyamide type and the like, but they can be used without particular limitation. As a joining means for joining each component, a means by welding a material such as a heat seal or an ultrasonic seal can also be used.

<Example of tape-type disposable diapers>
1 to 5 show an example of a tape-type disposable diaper as a disposable diaper of the present invention, in which reference numeral X indicates the entire width of the diaper excluding the fastening tape, and reference numeral Y indicates the diaper. Shows the total length. This tape-type disposable diaper has an absorber 56 extending from the ventral side to the dorsal side, a liquid-permeable top sheet 30 covering the front side of the absorber 56, and a liquid-impermeable sheet 11 covering the back side of the absorber 56. The ventral end flap portion EF and the dorsal end flap portion EF, which are portions extending to the front side and the rear side of the absorber 56, respectively, and which do not have the absorber 56. It has a pair of side flap portions SF extending laterally from the side edge of the absorber 56. A constriction along the leg circumference is formed in the middle of the side flap portion SF in the front-rear direction, and fastening tape 13 is provided on the back side of the constricted portion.

The back surface of the liquid impermeable sheet 11 is covered with the cover non-woven fabric 20. The cover non-woven fabric 20 extends to the peripheral edge of the diaper, the liquid-impermeable sheet 11 extends to the front-rear edge of the diaper in the front-rear direction, and the side edge of the absorber 56 and the side of the cover non-woven fabric 20 in the width direction. Although it extends to the edge, the cover nonwoven fabric 20 may be only a part in the front-rear direction, only a part in the width direction, or both, if necessary. For example, when a part of the liquid impermeable sheet 11 is covered with another material such as a gathered nonwoven fabric, the cover nonwoven fabric 20 may not be provided on that portion.

The top sheet 30 and the liquid impermeable sheet 11 are rectangular in the illustrated example, have slightly larger dimensions in the front-rear direction and the width direction than the absorbing element 50, and protrude from the side edge of the absorbing element 50 in the top sheet 30. The peripheral edge portion and the peripheral edge portion protruding from the side edge of the absorbing element 50 in the liquid impermeable sheet 11 are joined by a hot melt adhesive or the like.

Further, the absorbent element 50 has an absorbent body 56 and a packaging sheet 58 for wrapping the absorbent element 50, and can be interposed between the top sheet 30 and the liquid impermeable sheet 11, and between the top sheet 30 and the absorbent element 50. An intermediate sheet 40 can be provided.
Although the intermediate sheet 40 in the illustrated form is arranged in the center shorter than the width of the absorbing element 50, it may be provided over the entire width. The length in the longitudinal direction of the intermediate sheet 40 may be the same as the total length of the diaper, may be the same as the length of the absorbing element 50, or may be within a short length range centered on the region for receiving the liquid. In addition, a discoloring indicator that comes into contact with the liquid content of the excrement can be provided.

Side gathers 60 are provided on both sides of the surface of the tape-type disposable diaper in the width direction. Each side gather 60 has a first portion 61 (flat gather portion) provided on each side flap portion SF and a second portion 69 (three-dimensional gather portion) protruding on both side portions of the top sheet 30. It includes.
More specifically, a strip-shaped gathered nonwoven fabric 62 having a length equal to the total length Y of the diaper extends from the first portion 61 to the second portion 69, and the gathered nonwoven fabric 62 covers the first portion 61. It is bonded to the nonwoven fabric 20 with a hot melt adhesive or the like, and one gather elastic elastic member 63 along the front-rear direction LD is fixed between the nonwoven fabrics in an elongated state at intervals of one or the width direction WD. Due to the contraction force, the first portion 61 contracts in the front-rear direction LD to form a plane gather that contacts the circumference of the leg.
Further, the gathered nonwoven fabric 62 has an extending portion extending from the first portion 61 as a root portion toward the center side of the WD in the width direction, and at least this extending portion is folded back at the tip to form a two-layer structure. Has been done. Both ends of the anteroposterior LD in the extending portion are formed as an inverted portion 67 fixed to the top sheet 30, while the intermediate portion of the anteroposterior LD located between them is an unfixed free portion 68. A gather elastic elastic member 63 along the front-rear direction LD is fixed to the free portion 68 in an extended state with one or a plurality of gathered elastic elastic members 63 at intervals in the width direction WD, and the free portion of the second portion 69 is fixed by the contraction force. 68 contracts in the anteroposterior direction LD to form a three-dimensional gather that touches around the legs.

The fastening tape 13 in the illustrated embodiment includes a tape mounting portion 13C fixed to the side portion of the diaper, a sheet base material forming the tape main body portion 13B protruding from the tape mounting portion 13C, and a tape main body portion 13B in the sheet base material. It has a locking portion 13A with respect to the ventral side provided in the middle portion in the width direction of the above, and the tip end side from the locking portion 13A is a grip portion. The tape mounting portion 13C of the fastening tape 13 is sandwiched between the gather sheet 62 forming the inner layer and the cover nonwoven fabric 20 forming the outer layer in the side flap portion, and is adhered to both sheets 62 and 12 with a hot melt adhesive. .. Further, the locking portion 13A is bonded to the inner surface of the tape main body portion 13B with an adhesive.

As the locking portion 13A, a hook material (male material) of a mechanical fastener (hook-and-loop fastener) is suitable. The hook material has a large number of engaging protrusions on its outer surface side. The shapes of the engaging protrusions are (A) checkered, (B) J-shaped, (C) mushroom-shaped, (D) T-shaped, and (E) double J-shaped (J-shaped). There are shapes that are combined together), but any shape may be used. Of course, an adhesive layer can be provided as a locking portion of the fastening tape 13.

Further, as the sheet base material forming the tape mounting portion 13C to the tape main body portion 13B, a non-woven fabric, a plastic film, a polylami non-woven fabric, paper, or a composite material thereof can be used.

When wearing the diaper, the fastening tape 13 is locked to an appropriate position on the outer surface of the ventral side F with the side flap portion SF on the dorsal side overlapped on the outside of the side flap portion SF on the ventral side. The position and dimensions of the locking portion of the fastening tape 13 can be arbitrarily determined.

It is preferable to provide a target sheet 24 having a target for facilitating the locking at the locking portion of the fastening tape 13 on the ventral side F. When the locking portion 13A is a hook material, the target sheet 24 is a film type having a film layer and an engaging layer provided on the entire outer surface thereof on which the hook of the locking portion 13A is detachably engaged. Can be preferably used. In this case, the engaging layer is a net-like body knitted with threads having loops mounted on the film layer, and a non-woven fabric layer of thermoplastic resin is provided by intermittent ultrasonic sealing. It is known that the non-woven fabric fibers are attached on the film layer and form a loop, but any of them can be preferably used. It is also possible to use a filmless type target tape which is made by embossing a non-woven fabric of a thermoplastic resin and has no film layer. In these target tapes, the fastening tape 13 is bonded by the hook of the fastening tape 13 being entangled or caught in the loop.

When the locking portion 13A is an adhesive layer, a sheet substrate made of a plastic film having a smooth surface, which is highly adhesive, and which has been subjected to a peeling treatment can be used.

Further, when the locking portion of the fastening tape 13 on the ventral side F is made of a non-woven fabric, for example, when the cover nonwoven fabric 20 of the illustrated embodiment is made of a nonwoven fabric and the locking portion of the fastening tape 13 is a hook material 13A. The target sheet 24 may be omitted, and the hook material 13A may be entwined with the non-woven fabric of the cover non-woven fabric 20 to be locked. In this case, the target sheet 24 may be provided between the cover nonwoven fabric 20 and the liquid impermeable sheet 11.

The end flap portion EF is a portion that extends to the front side and the rear side of the absorption element 50, respectively, and does not have the absorber 56, and the front extension portion is the ventral end flap portion EF. The extended portion on the rear side is the dorsal end flap portion EF.
The length of the dorsal end flap EF in the anteroposterior direction is preferably the same as or shorter than the anterior-posterior length of the attachment portion of the fastening tape 13 for the reason described above, and the dorsal end of the diaper and the absorbing element 50 are formed. If they are too close to each other, a gap is likely to occur between the dorsal end of the diaper and the surface of the body due to the thickness and stiffness of the absorbing element 50, so the thickness is preferably 10 mm or more.
The anteroposterior length of the ventral end flap portion EF and the dorsal end flap portion EF is preferably about 5 to 20% of the anteroposterior length L of the entire diaper, and is 10 to 60 mm for infant diapers. In particular, it is appropriate to set it to 20 to 50 mm.

In order to improve the fit of the dorsal side of the diaper, an elastic elastic member that elastically expands and contracts in the width direction, particularly a band-shaped dorsal elastic sheet 70, is provided between the fastening tapes 13, as shown in FIG. It is preferable that it is provided. Both ends of the dorsal telescopic sheet 70 are preferably extended to a portion overlapping the attachment portions of both fastening tapes 13, but may be separated from each other toward the center in the width direction. The front-rear dimension of the dorsal telescopic sheet 70 is preferably within a range of about plus or minus 20% with respect to the front-rear dimension of the mounting portion of the fastening tape 13. Further, when the dorsal telescopic sheet 70 is arranged so as to overlap the boundary line between the dorsal end flap portion EF and the absorbing element 50 as shown in the figure, the dorsal end portion of the absorbing element 50 is firmly pressed against the body. Therefore, it is preferable.

The dorsal elastic sheet 70 may use a sheet-like elastic member such as a rubber sheet, but it is preferable to use a non-woven fabric or paper from the viewpoint of breathability. In this case, a sheet-like elastic member having breathability such as a stretchable non-woven fabric can be used, but as shown in FIG. 5A, the sheet base material 71 such as two non-woven fabrics is used as a hot melt adhesive or the like. An elastic stretchable member 72 such as a perforated sheet-like, net-like, or elongated shape (thread-like or string-like) is fixed between the two sheet base materials 71 in a stretched state along the width direction while being bonded with an adhesive. Is preferably used. As the sheet base material 71 in this case, the same material as the cover nonwoven fabric 20 can be used. The elongation rate of the elastic elastic member 72 is preferably about 150 to 250%. Further, when an elongated elastic member 72 (thread-like or string-like) is used, it is preferable to provide about 5 to 15 elastic elastic members 72 having a thickness of 420 to 1120 dtex at intervals of 72 d of 3 to 10 mm.

Further, as shown in FIG. 5A, it is preferable to arrange the elastic elastic member 72 so as to cross the absorbent element 50 because the fit of the absorbent element 50 is improved. In this case, the elastic elastic member is elastically expanded and contracted. When a part or all of the portion where the member 72 overlaps with the absorbing element 50 is prevented from contracting by means such as cutting, the dorsal end portion of the absorbing element 50 does not shrink in the width direction, so that the fit is further improved. improves.

The elastic elastic member 72 may be fixed over the entire length of the sheet base material 71 in the longitudinal direction of the sheet (width direction of the diaper), but in order to prevent shrinkage and turning over when the sheet is attached to the diaper body, the elastic member 72 may be fixed. In the range of about 5 to 20 mm at the end in the front-rear direction (width direction of the diaper), it is preferable that the contractile force does not work or the elastic elastic member 72 does not exist. When the elastic elastic member 72 is not present, frills that do not hit the skin can be formed and the air permeability is improved.

In the illustrated embodiment, the dorsal elastic sheet 70 is sandwiched between the gather sheet 62 and the cover nonwoven fabric 20 on both sides in the width direction of the liquid impermeable sheet 11, and is impermeable at a portion overlapping the liquid impermeable sheet 11. Although it is provided so as to be sandwiched between the permeable sheet 11 and the absorbent element 50, it may be provided between the liquid impermeable sheet 11 and the cover nonwoven fabric 20, or it may be provided on the outer surface of the cover nonwoven fabric 20. It may be provided between the top sheet 30 and the absorbing element 50.
Further, the dorsal telescopic sheet 70 may be provided on the top sheet 30, and in this case, it may be provided on the gather sheet 62 on both sides of the liquid impermeable sheet 11 in the width direction. When the cover nonwoven fabric 20 is formed by stacking a plurality of sheet substrates, the entire dorsal stretchable sheet 70 may be provided between the sheet substrates of the cover nonwoven fabric 20.

<Example of basic configuration of the present invention>
The disposable diaper of the present invention is between the top sheet 30 constituting the front surface on the use side and the liquid impermeable sheet 11 provided on the back surface side, referring to the explanatory reference numerals in the above-described embodiment. In a disposable diaper having an absorbent element 50 interposed in the
The top sheet 30 is characterized by having a lotion agent application region M containing at least one of a fatty acid and a fatty alcohol and a polyhydric alcohol.

In the basic configuration of the present invention, in particular, when the top sheet 30 is a perforated non-woven fabric in which a large number of holes 14 penetrating the front and back are provided at intervals, the loose stool component is quickly absorbed through the holes 14. It can be absorbed by the absorbing element 50, and the loose stool component remains on the surface of the top sheet 30, which not only reduces skin irritation and suppresses diaper rash, but also prevents leakage from the legs and back. Useful for.

Further, when the lotion agent application region M containing at least one of the fatty acid and the fatty alcohol and the polyhydric alcohol is formed on the outer surface of the top sheet 30, the lotion agent is contained in at least the outer surface portion of the top sheet 30. , And at least one of the fatty acid and fatty alcohol contained in the lotion application area M and the polyhydric alcohol act to not only protect the wearer's skin but also to reduce the frictional force with the wearer's skin. Demonstrate the function of reducing. As a result, when the disposable diaper is worn, the top sheet 30 slips against the skin according to the change in the posture of the wearer, the contact with the skin with the wearer is ensured, and the leakage prevention effect is enhanced. In particular, the polyhydric alcohol can suppress at least one of the fatty acid and the fatty alcohol from being absorbed into the diaper, and can prevent excessive application leading to stickiness. In addition, it becomes easy to apply evenly to a wide range of top sheets 30.

At least one of the fatty acid and the fatty alcohol and the polyhydric alcohol should both be liquid at room temperature. Naturally, such fatty acids and fatty alcohols that are liquid at room temperature cannot immobilize the emollient agent. The normal temperature here is 20 ° C. ± 15 ° C. specified in JIS Z 8703. If at least one of the fatty acid and the fatty alcohol and the polyhydric alcohol are both liquid at room temperature, it is easier to apply them uniformly to a wide range of topsheets 30, and the fatty acid and the fatty alcohol are particularly suitable for the wearer. It can be efficiently transferred to the skin and can be reliably transferred to the desired position on the wearer's skin. Further, in particular, the presence of the polyhydric alcohol makes it difficult for the top sheet 30 to be clogged, and highly fluid stools such as water stools and loose stool components can quickly permeate the top sheet 30.

The fatty acid and fatty alcohol are not necessarily limited, but those having C12 to C24 carbon atoms are preferable. Many of C12 to C24 are also simply called oils, which are liquid at room temperature and have an appropriate viscosity, which makes it difficult to generate a sticky feeling. Specific preferred examples include linoleic acid and oleic acid. A plurality of types of fatty acids and fatty alcohols may be mixed. In this case, it is preferable that the fatty acid and fatty alcohol of C12 to C24 are contained in an amount of 70% by mass or more, preferably 80% by mass or more, and particularly preferably 95% by mass or more. Further, the fatty acid and the fatty alcohol may be plant-derived oils such as olive oil, grape seed oil, camellia oil and moringa oil. For example, moringa oil contains 70% by mass or more of oleic acid. The amount of the fatty acid and the fatty alcohol added is 0.1 to 3.0% by mass, preferably 0.5 to 2.0% by mass. The coating amount is preferably 0.0004 to 0.002 g / 10 cm × 10 cm.

The polyhydric alcohol is preferably a divalent or trivalent alcohol that is liquid at room temperature, and is particularly preferably hygroscopic. A plurality of types of polyhydric alcohols may be mixed. Sorbitol, chrysitol and the like obtained by reducing sugar and the like, which are solid at room temperature, are not preferable. Specific preferred examples are propylene glycol, glycerin, 1,3-propanediol, and 1,3-butylene glycol. Of these, 1,3-propanediol and glycerin are preferable, and glycerin is the most preferable. Therefore, it is desirable that the polyhydric alcohol contains at least these. In particular, glycerin has high hygroscopicity and is excellent in action as a moisturizer, and is inexpensive and easy to handle. Therefore, it is preferable to use glycerin as a main component.

The ratio of at least one of the fatty acid and the aliphatic alcohol to the polyhydric alcohol in the lotion agent application region M is preferably 0.01 to 4% by mass. In addition to being able to sufficiently transfer fatty acids and the like to the wearer, the sticky feeling can be extremely reduced.

The lotion agent application region M is formed on the top sheet 30 by coating or the like in the diaper manufacturing process. In particular, as shown in FIG. 10, at least one of a fatty acid and a fatty alcohol may be applied as a lotion agent in which a polyhydric alcohol is mixed to form a lotion agent appropriate amount region M, but as shown in FIG. After applying the polyhydric alcohol M2, at least one of the fatty acid and the fatty alcohol M1 may be applied over the applied area. Even in this case, the ratio of at least one of the fatty acid and the aliphatic alcohol to the polyhydric alcohol in the region is preferably 0.01 to 4% by mass. When at least one of fatty acid and fatty alcohol is applied over the coated area after the polyhydric alcohol is applied, the polyhydric alcohol M2 is unevenly distributed on the surface side of the top sheet 30 as shown in FIG. Will be.

A type selected from the group of emulsifiers, phosphate esters, paraffins and surfactants as components other than fatty acids and fatty alcohols with respect to polyhydric alcohols as the component composition of the lotion agent application region M according to the present invention. Alternatively, it may contain a plurality of types of additives. As the surfactant, an ether type nonionic surfactant and a nonionic surfactant including EO / PO type are preferable. When these are used, they can be mixed with a lotion. When the polyhydric alcohol and the fatty acid and the aliphatic alcohol are separately added, they can be mixed in the respective drug solutions.

As a specific method for applying at least one of the fatty acid and the fatty alcohol to the top sheet 30 and the polyhydric alcohol, a known liquid application technique is used. For example, printing techniques such as spray coating, nozzle coating, and roll coating can be mentioned.

In the diaper manufacturing process, after the lotion application area M is formed on the top sheet 30, a large number of diaper products are compactly packaged. As shown schematically in FIG. 9, due to the consolidation of the diaper and the time until shipment, at least one part of the polyhydric alcohol, the fatty acid, and the fatty alcohol in the lotion application area M formed on the top sheet 30. Transfers to the inside of the diaper close to the absorbent element 56, particularly to the intermediate sheet 40, between the top sheet fibers and through the openings 14. The intermediate sheet has a faster permeation rate of body fluid than the top sheet 30. In addition, polyhydric alcohols such as glycerin are highly hydrophilic. As a result, the polyhydric alcohol transferred to the intermediate sheet 40 side acts to draw in the body fluid from the top sheet 30 side or the loose stool component passing through the opening 14. Therefore, the body fluid from the top sheet 30 side or the loose stool component passing through the opening 14 is quickly guided to the absorption element 50 side, and the residual body fluid such as the loose stool component is suppressed on the surface of the top sheet 30. Skin irritation is reduced and diaper rash can be suppressed.

Further, the hygroscopic property of the polyhydric alcohol inhibits the action of at least one of the fatty acid and the fatty alcohol passing through the top sheet 30 and being guided to the absorption element 56, so that the fatty acid and the fatty alcohol stay on the surface of the top sheet 30. And the amount of at least one of fatty alcohols used can be reduced to reduce the stickiness. This effect becomes remarkable by making the polyhydric alcohol more unevenly distributed on the surface side of the top sheet as described above.

When the top sheet 30 is a non-woven fabric containing synthetic fibers, it has good compatibility with oil-based fatty acids and fatty alcohols, but due to the presence of polyhydric alcohols having hydrophilicity, particularly hygroscopicity, the topsheet 30 can be appropriately mixed with fatty acids and fatty alcohols. The affinity with synthetic fibers is hindered, and while having the advantages of a non-woven fabric containing synthetic fibers, it becomes non-sticky.

The lotion application region M may have a plurality of compartments having different mass ratios of at least one of the fatty acid and the fatty alcohol to the polyhydric alcohol. In this case, when at least one of the fatty acid and the fatty alcohol and the polyhydric alcohol are applied separately, the respective application amounts can be adjusted. When applying the mixed lotion agent, the blending ratio at the time of producing the lotion agent can be adjusted. In any case, the ratio of at least one of the fatty acid and the aliphatic alcohol to the polyhydric alcohol is preferably 0.01 to 4% by mass in any of the compartments.

The lotion application region M can be applied along the front-rear direction at intervals in the width direction, for example, as shown in FIG. This application is performed, for example, by mixing or separately ejecting at least one of fatty acid and fatty alcohol and a polyhydric alcohol from a coating nozzle arranged at intervals in the width direction of the manufacturing process, or coating by a transfer method. Examples such as For example, the applied width mx of the moisturizer M shown in FIG. 8 can be 5 to 30 mm, the interval md can be 5 to 30 mm, and the applied length my in the front-rear direction can be 50 mm to the front-back length of the product. In addition to applying the product in the anteroposterior direction to the anterior-posterior length of the product, it is desirable to apply it mainly to the crotch portion where the effect according to the present invention is remarkable and to reduce the material cost, so that it is not applied to a certain length before and after the product. ..

As another embodiment of the lotion application region M, the example shown in FIG. 12 includes a side edge section Ma, a side section Mb, and a central section Mc that are adjacent to each other in the width direction and along the front-rear direction, in particular, in a plan view. The side edge compartment Ma and the central compartment Mc have at least one of a fatty acid and a fatty alcohol, and the amount of the polyhydric alcohol with respect to the side compartment Mb sandwiched between the side edge compartment Ma and the central compartment Mc. Is decreasing. From the structure of the diaper described above, the side edge section Ma is located near the undercarriage, the side section Mb is located at the buttocks, and the central section Mc is located at a position substantially facing the intergluteal cleft. Since the buttocks are particularly prone to contact with the surface of the top sheet 30, it is easy to transfer to the skin by slightly increasing the amount applied in the side compartment Mb. On the other hand, it is hard to feel the stickiness because it is a part where the discomfort is hard to feel compared to the local part located in the undercarriage and the intergluteal cleft. On the other hand, by reducing the amount of the side edge section Ma facing the suspension portion that is sensitive to stickiness, the wearing feeling is further enhanced. In addition, since the central section Mc facing the intergluteal cleft is the part that is most likely to come into contact with stool, by reducing the amount given in this part, the fluidity of water stool and loose stool components is high. It has excellent stool absorption performance.

The side edge section Ma, the side section Mb, and the central section Mc may be separated from each other. The applicable width mx of each section should be 5 to 35 mm, the interval md should be 0 to 30 mm, and the applied length my in the front-rear direction should be 50 mm or more. The ratio of the length in the width direction is not limited, but the width L2 of the side edge section is 0.5 to 1.5, side to the width L1 of the central section so as to correspond to the buttocks, undercarriage, and intergluteal cleft. It is preferable that the width L3 of the subsection is about 1 to 3.

The top sheet 30 is a perforated non-woven fabric having a large number of openings 14. Although the exact reason is not clear, the large number of openings 14 causes the contact area of the wearer's skin to be smaller than that of the non-woven fabric having no openings. It is thought that it also exerts a function of reducing the frictional force of the. As a result, when the disposable diaper is worn, the top sheet slips against the skin according to the change in the posture of the wearer, the contact with the skin with the wearer is ensured, and the leakage prevention effect is considered to be enhanced. ..

The shape and arrangement of the openings 14 of the top sheet 30 are not limited, but in the planar arrangement of the openings 14, the virtual line 14q connecting the adjacent openings 14 shown as a typical example in FIG. 7 has a Moroccan pattern D. It is suitable to form.
When the opening 14 is also formed in the cover nonwoven fabric 20, it is preferable in terms of design that the cover non-woven fabric 20 has the same Moroccan pattern D as the top sheet 30.

Although the exact reason for the advantage of this Moroccan pattern D is not clear, the virtual connecting lines R1 and R2 formed by the 14 groups of openings form an oblique lattice, and the virtual connecting lines R1 and R2 are the starting lines of deformation. It is considered that the reason is that the top sheet 30 (including the cover non-woven fabric 20 in some cases) is easily deformed in the front-rear and width directions.
The top sheet 30 (including the cover non-woven fabric 20 in some cases) originating from the virtual connecting lines R1 and R2 is deformed with the easily deformable liquid impermeable sheet 11 against deformation in the front-rear and width directions. do.

In the form in which the opening 14 is the above-mentioned Moroccan pattern D and the lotion agent application region M is along the anteroposterior direction at intervals in the width direction shown in FIG. 8, the opening 14 group in the Moroccan pattern D is substantially. It is along the width direction and is along the virtual connecting lines R1 and R2. As a result, the applied lotion or the like diffuses in the width direction and the anteroposterior direction even in the non-applied region, and the lotion agent appropriate amount region M can be formed as a whole with a small application amount.

In the embodiment, the Moroccan pattern D is formed over the entire length of the cover nonwoven fabric 20 and the top sheet 30 in the front-rear direction. The Moroccan pattern D can be formed only at the end of the disposable diaper, for example, at the back end, but due to the manufacturing process, it is difficult to control the position between the cover non-woven fabric and the top sheet material and the opening position, and ventilation is possible. In order to ensure the property over the entire length, it is desirable to form the Moroccan pattern D over the entire length of the cover nonwoven fabric 20 and the top sheet 30 in the front-rear direction.

The individual opening shapes of the openings 14 are elongated holes as shown in FIGS. 6 (a) and 6 (b), as well as a perfect circle as shown in FIGS. 6 (c) and 6 (e), and FIG. 6 (d). It can be any shape such as an ellipse, a triangle, a rectangle, a polygon such as a rhombus, a star shape, and a cloud shape as shown in.
In the Moroccan pattern D as well, the individual opening shapes can be formed in the same manner as shown in FIG.

The dimensions of the individual openings 14 according to the present invention are not particularly limited, but exemplifying with reference to FIG. 6, the maximum dimension 14L of the anteroposterior LD is 0.3 to 1.8 mm, particularly 0.4 to 1.0 mm. The maximum dimension 14W in the width direction WD is preferably 0.2 to 1.5 mm, particularly preferably 0.3 to 1.0 mm. When the shape of the opening 14 is long in one direction (the total length in one direction is longer than the total length in the direction orthogonal to this) such as an elongated hole, an ellipse, a rectangle, a rhombus, etc., the shape is in the longitudinal direction. The maximum dimension is preferably 1.2 to 2.5 times the maximum dimension in the direction orthogonal to this. When the shape of the opening 14 is long in one direction, it is desirable that the longitudinal direction of the opening 14 is the front-rear LD, but the width direction WD or the diagonal direction may be used.
The area and area ratio of each opening 14 may be appropriately determined, but the area is preferably about 0.1 to 2.7 mm ² (particularly 0.1 to 1.0 mm ² ), and the area ratio is 1. It is preferably about 0.0 to 15.0% (particularly 5.0 to 10.0%).

Various shapes of individual openings in the Moroccan pattern D can be selected, and the diameter may be a circle with a diameter of 0.5 to 1.5 mm, or the equivalent diameter may be 0.5 to 1.5 mm, which are adjacent to each other. The center-to-center distance connecting the openings is 1.0 to 4.0 mm, and the area of one non-opening area Z surrounded by the virtual line 14q connecting the openings in the Moroccan pattern is 1.0 to 3.5 cm ² . It is desirable to have it.

The components of the embodiment will be described below.

<Cover non-woven fabric>
Many disposable diapers such as disposable diapers and menstrual napkins are provided with a breathable liquid-impermeable sheet on the back side of the absorber in order to prevent strike-through of the absorbent liquid and ensure breathability. It is known that the liquid-impermeable sheet has a cloth-like appearance and feel, and the back surface of the liquid-impermeable sheet is covered with a cover non-woven fabric.

The cover nonwoven fabric 20 of the embodiment is also provided to give a cloth-like appearance and feel. The cover nonwoven fabric 20 covers the back side of the liquid impermeable sheet 11 and forms the outer surface of the product at least a part of the portion covering the liquid impermeable sheet 11.

In this case, when the cover non-woven fabric is laminated on the breathable liquid impermeable sheet, the breathability is lowered by the amount of the cover non-woven fabric. As one preferable method for solving this problem, a perforated nonwoven fabric having a large number of openings penetrating the front and back is used as the cover nonwoven fabric.

Also in the illustrated embodiment, the cover nonwoven fabric 20 is a perforated nonwoven fabric in which a large number of openings 14 penetrating the front and back are provided at intervals. The type of fiber of the cover nonwoven fabric 20 and the processing method of fiber bonding (entanglement) are not particularly limited and can be appropriately selected, but it is desirable to use an air-through nonwoven fabric, in which case the basis weight is 20 to 30 g / m. ^2. The thickness is preferably 0.3 to 1.0 mm.

Considering the effect of improving the air permeability, the cover nonwoven fabric 20 can form the openings 14 in the entire front-rear direction and the width direction of the cover nonwoven fabric 20 in the tape type disposable diaper.

(Top sheet)
The top sheet 30 has a property of allowing liquid to permeate, and examples thereof include a perforated or non-perforated non-woven fabric and a porous plastic sheet. Further, among these, the non-woven fabric is not particularly limited as to what the raw material fiber is. For example, olefin-based fibers such as polyethylene and polypropylene, synthetic fibers such as polyester-based and polyamide-based fibers, recycled fibers such as rayon and cupra, natural fibers such as cotton, mixed fibers and composite fibers in which two or more of these are used. Etc. can be exemplified. Further, the nonwoven fabric may be produced by any processing. As the processing method, 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, a point bond method and the like can be exemplified. For example, if flexibility and drapeability are required, the spunbond method and spunlace method are preferable, and if bulkiness and softness are required, the air-through method, point bond method and thermal bond method are preferable processing methods. ..

In particular, a non-woven fabric manufactured by the air-through method is desirable from the viewpoint of seeking bulkiness and softness.
As the non-woven fabric fiber, for example, PE / PET of 1.5 to 3.5 dtex can be used.

The basis weight of the top sheet 30 is preferably 10 to 30 g / m ² . If it is less than 10 g / m ² , bodily fluid regurgitation may occur, and if it exceeds 30 g / m ² , it is difficult to obtain sufficient softness.

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

Both sides of the top sheet 30 may be folded back on the side edge of the absorbing element 50, or may be projected laterally from the side edge of the absorbing element 50 without being folded.

It is desirable that the top sheet 30 is fixed to a member adjacent to the back side by a joining means by material welding such as a heat seal or an ultrasonic seal or a hot melt adhesive for the purpose of preventing misalignment with respect to the back side member. .. In the illustrated form, the top sheet 30 is fixed to the surface of the intermediate sheet 40 and the surface of the packaging sheet 58 on the front side of the absorber 56 by a hot melt adhesive applied to the back surface thereof.

<Opening plane arrangement of top sheet>
The top sheet 30 is a perforated non-woven fabric having perforations 14 in order to rapidly transfer the body fluid to the absorbing element 50. The planar arrangement of the openings 14 is an oblique lattice as shown in FIG. 6 (a), a hexagonal lattice as shown in FIG. 6 (b) (these are also called staggered), and FIG. 6 (c). A square lattice as shown in FIG. 6 (d), a rectangular lattice as shown in FIG. 6 (d), and a parallel lattice as shown in FIG. 6 (e) (as shown in the figure, a group of a large number of parallel diagonal rows are formed. In addition to those that are regularly repeated, such as (a form in which two groups are provided so as to intersect each other) (including those that are inclined at an angle of less than 90 degrees with respect to the anteroposterior LD), a group of holes 14 (The arrangement of the group unit may be regular or irregular, and may be a pattern, a character shape, etc.) may be repeated regularly.

The anteroposterior spacing 14y and the width spacing 14x of the opening 14 of the top sheet can be appropriately determined, but in consideration of air permeability, 14y is 0.9 to 8.0 mm and 14x is 2.0 to 10 mm, respectively. It is desirable that 14y is in the range of 1.0 to 3.0 mm and 14x is in the range of 3.0 to 5.0 mm. In particular, as shown in FIG. 6D, rows of openings 14 arranged in the front-rear direction with a front-rear spacing 14y narrower than the front-rear dimension 14L of the openings 14 are repeated in the width direction WD at predetermined intervals, and the rows thereof are repeated. When the widthwise spacing 14x is wider than the anteroposterior dimension 14L of the opening 14 (more preferably, it is more than 3 times the widthwise dimension 14W of the opening 14), the improvement in air permeability is remarkable. It is preferable because it does not impair the softness and bulkiness, and does not reduce the tensile strength of the sheet in the front-rear direction, which is important during manufacturing. In particular, in this case, it is preferable that the shape of the opening 14 is elongated in the front-rear direction LD.

Of course, in bonding the top sheet 30 and the intermediate sheet 40, thermal bonding, ultrasonic bonding, or the like can be used, but hot melt bonding is preferable in order to ensure softness.

(Intermediate sheet)
In order to quickly transfer the liquid that has permeated the top sheet 30 to the absorber, an intermediate sheet (also referred to as a "second sheet") 40 having a faster liquid permeation speed than the top sheet 30 can be provided. The intermediate sheet 40 not only rapidly transfers the liquid to the absorber to improve the absorption performance by the absorber, but also prevents the phenomenon of "return" of the absorbed liquid from the absorber and constantly dries the top sheet 30. It can be in the state of being. The intermediate sheet 40 may be omitted.

Examples of the intermediate sheet 40 include the same materials as the top sheet 30, spunlace, spunbond, SMS, pulp non-woven fabric, mixed sheet of pulp and rayon, point bond or crepe paper. In particular, the air-through non-woven fabric is preferable because it is bulky. It is preferable to use a composite fiber having a core-sheath structure 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 20 to 80 g / m ² , more preferably 25 to 60 g / m ² . The thickness of the raw material fiber of the non-woven fabric is preferably 2.0 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use eccentric fibers having no core in the center, hollow fibers, and eccentric and hollow fibers as mixed fibers of all or a part of the raw material fibers.

Although the intermediate sheet 40 of the illustrated form is arranged in the center shorter than the width of the absorber 56, it may be provided over the entire width. The length in the longitudinal direction of the intermediate sheet 40 may be the same as the total length of the diaper, may be the same as the length of the absorbing element 50, or may be within a short length range centered on the region for receiving the liquid.

It is desirable that the intermediate sheet 40 is fixed to a member adjacent to the back side by a joining means by material welding such as a heat seal or an ultrasonic seal or a hot melt adhesive for the purpose of preventing misalignment with respect to the back side member. .. In the illustrated form, the intermediate sheet 40 is fixed to the surface of the portion of the packaging sheet 58 located on the front side of the absorber 56 by the hot melt adhesive applied to the back surface thereof.

(Liquid impermeable sheet)
The material of the liquid-impermeable sheet 11 is not particularly limited, but is, for example, a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric in which a plastic film is provided on the surface of the nonwoven fabric, or a plastic film. An example is a laminated sheet in which a non-woven fabric or the like is laminated and bonded to the surface. For the liquid-impermeable sheet 11, it is preferable to use a liquid-impermeable and moisture-permeable material that is preferably used from the viewpoint of preventing stuffiness. As a moisture-permeable plastic film, a microporous plastic film obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet and then stretching it in a uniaxial or biaxial direction. Is widely used. In addition to this, non-woven fabrics using microdenyl fibers, leakage-proof enhancement by reducing the voids of the fibers by applying heat or pressure, and coating of highly water-absorbent resin or hydrophobic resin or water-repellent agent. Therefore, a liquid-impermeable sheet without using a plastic film can also be used as the liquid-impermeable sheet 11, but it has sufficient adhesive strength when bonded to the cover non-woven fabric 20 described later via a hot melt adhesive. Therefore, it is desirable to use a plastic film.

As shown in the figure, the liquid impermeable sheet 11 has a width that fits on the back side of the absorbing element 50, and in order to improve leakage resistance, the liquid impermeable sheet 11 is wrapped around both sides of the absorbing element 50 to form a side surface of the top sheet 30 of the absorbing element 50. It can also be extended to both sides. The width of this extending portion is appropriately about 5 to 20 mm on each of the left and right sides.

Further, an excretion indicator whose color changes due to absorption of the liquid can be provided on the inside of the liquid impermeable sheet 11, particularly on the side surface of the absorber 56.

(Side gather)
The side gathers 60 extend over the entire front-rear direction LD and are provided in contact with the wearer's legs to prevent lateral leakage, and are generally called three-dimensional gathers 69 or flat gathers. This includes what is called 61.

The gathered non-woven fabric 62 includes spunbonded non-woven fabrics (SS, SSS, etc.), SMS non-woven fabrics (SMS, SMSMS, etc.), melt-blown non-woven fabrics, and other flexible non-woven fabrics with excellent uniformity and concealment properties. The treated material can be preferably used, and the fiber texture is preferably about 10 to 30 g / m ² . As the elongated elastic elastic member 63, thread rubber or the like can be used. When spandex yarn rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation rate at the time of fixing is preferably 150 to 350%, more preferably 200 to 300%. The term "elongation rate" means a value when the natural length is 100%. Further, as shown in the drawing, the waterproof film 64 can be interposed between the gathered nonwoven fabric 62 folded in two, and in this case, the gathered nonwoven fabric 62 is partially omitted in the existing portion of the waterproof film 64. However, in order to make the appearance and feel of the product like a cloth, it is necessary that at least the outer surface from the base end to the tip of the side gather 60 is formed of the gathered non-woven fabric 62 as shown in the illustrated form. Is.

The number of elongated elastic elastic members 63 provided in the free portion of the side gather 60 is preferably 2 to 6, and more preferably 3 to 5.

(Absorption element)
The absorbing element 50 has an absorber 56 and a packaging sheet 58 that encloses the entire absorber 56.

(Absorber)
The absorber 56 can be formed by an aggregate of fibers. The fiber aggregate is a filament aggregate obtained by stacking short fibers such as cotton-like pulp and synthetic fibers, and opening tow (fiber bundle) of synthetic fibers such as cellulose acetate as needed. Can also be used. The fiber basis weight may be, for example, about 100 to 300 g / m ² in the case of stacking cotton-like pulp or staple fibers, and about 30 to 120 g / m ² in the case of filament aggregates. Can be done. In the case of synthetic fibers, the fineness is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex. In the case of a filament aggregate, the filament may be a non-crimped fiber, but is preferably a crimped fiber. The degree of crimping of the crimped fibers can be, for example, 5 to 75 pieces per inch, preferably 10 to 50 pieces, and more preferably about 15 to 50 pieces. In many cases, crimped fibers that are uniformly crimped are used. It is preferable to disperse and hold the highly absorbent polymer particles in the absorber 56.

The absorber 56 may have a rectangular shape, but may have an hourglass shape having a front end portion, a rear end portion, and a constricted portion located between them and having a narrower width than the front end portion and the rear end portion.

Further, the dimensions of the absorber 56 can be appropriately determined as long as it covers the front, back, left and right of the urination port position.

(Highly absorbent polymer particles)
The absorber 56 may contain high-absorbent polymer particles in part or all of the absorber 56. The highly absorbent polymer particles include "powder" as well as "particles". As the highly absorbent polymer particles 54, those used for this kind of disposable diaper can be used as they are, for example, sieving with a standard sieve (JIS Z8801-1: 2006) of 500 μm (shaking for 5 minutes). It is desirable that the proportion of particles remaining on the sieve is 30% by mass or less, and the proportion of particles remaining on the sieve by sieving (shaking for 5 minutes) using a standard sieve of 180 μm (JIS Z8801-1: 2006) is desired. 60% by mass or more is desirable.

The material of the highly absorbent polymer particles can be used without particular limitation, but those having a water absorption of 40 g / g or more are preferable. Highly absorbent polymer particles include starch-based, cellulose-based and synthetic polymer-based ones, which are starch-acrylic acid (salt) graft copolymers, starch-acrylonitrile copolymer kendies, and cross-linking of sodium carboxymethyl cellulose. A substance, an acrylic acid (salt) polymer, or the like can be used. As the shape of the highly absorbent polymer particles, the commonly used powder or granular material is preferable, but other shapes can also be used.

As the highly absorbent 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, so-called reversion, in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56, is likely to occur.

Further, as the highly absorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. As a result, even when the bulky absorber 56 is used, the sticky feeling after liquid absorption can be effectively suppressed.

The basis weight of the highly absorbent polymer particles can be appropriately determined according to the absorption amount 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 basis weight of the polymer is less than 50 g / m ² , it becomes difficult to secure the absorption amount. Above 350 g / m ² , the effect saturates.

If necessary, the highly absorbent polymer particles can be adjusted in spray density or spray amount in the plane direction of the absorber 56. For example, the liquid excretion site can be sprayed in a larger amount than other sites. When considering the difference between men and women, the spray density (amount) on the front side can be increased for men, and the spray density (amount) on the central part can be increased for women. Further, it is also possible to provide a portion where the polymer does not exist locally (for example, in the form of a spot) in the plane direction of the absorber 56.

(Packaging sheet)
In order to prevent the highly absorbent polymer particles from coming off or to improve the shape retention of the absorber 56, it is preferable to cover the absorber 56 with the packaging sheet 58.
When the packaging sheet 58 is used, as the material thereof, tissue paper, particularly crepe paper, non-woven fabric, non-woven fabric of polylami, a sheet having small holes, or the like can be used.

Conventionally, crepe paper is often used. In the present invention, SMS non-woven fabric (spunbond-meltblown-spunbond laminated non-woven fabric) or SMMS non-woven fabric (spunbond / meltblown / meltblown / spunbond laminated non-woven fabric) is used.
When crepe paper is used, the pulp fibers are aligned in the front-rear direction (MD direction) and are arranged in a precise manner, so that the rigidity in the front-rear direction is particularly high (inferior in softness).
On the other hand, when SMS non-woven fabric or SMMS non-woven fabric is used, the rigidity in the front-rear direction is particularly low (excellent in softness), and as shown in the later cantilever test results, the rigidity in the front-rear direction (MD direction) and the angle of 45 degrees. The flexural rigidity becomes lower than that when crepe paper is used.
As a result, when the disposable diaper is worn, it deforms satisfactorily (bends well) according to the change in the posture of the wearer, the contact with the skin with the wearer is ensured, and the leak prevention effect is enhanced.

As the material of the SMS non-woven fabric and the SMMS non-woven fabric, polypropylene, polyethylene / polypropylene composite material and the like can be used. In particular, a non-woven fabric that has been hydrophilized is desirable in order to enhance the absorption characteristics of body fluids.
The basis weight is preferably 5 to 40 g / m ² , especially 10 to 30 g / m ² .

The packaging form of the packaging sheet 58 can be appropriately determined, but from the viewpoint of ease of manufacture and prevention of leakage of highly absorbent polymer particles from the front and rear edge edges, a cylinder is provided so as to surround the front and back surfaces and both side surfaces of the absorber 56. It is preferable that the particles are wound in a shape, the front and rear edges thereof are protruded from the front and back of the absorber 56, and the overlapped portion and the overlapped portion of the front and rear protruding portions are joined by a joining means such as hot melt adhesive or material welding.
If necessary, only the front and back surfaces may be covered with two non-woven fabrics without covering both sides of the absorber 56.

<Explanation of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.

-The "front-back (vertical) direction" means the direction connecting the ventral side (front side) and the dorsal side (rear side), and the "width direction" means the direction orthogonal to the front-back direction (horizontal direction).

・ "Front side" means the one closer to the wearer's skin when wearing a tape-type disposable diaper, and "back side" means the one farther from the wearer's skin when wearing a tape-type disposable diaper. ..

・ "Front side" means the surface of the member that is closer to the wearer's skin when wearing a tape-type disposable diaper, and "back side" means the side of the member that is closer to the wearer's skin when wearing a tape-type disposable diaper. It means the far side.

-"Area ratio" means the ratio of the target part to the unit area, and is expressed as a percentage by dividing the total area of the target part (for example, holes) in the target area (for example, cover non-woven fabric) by the area of the target area. Is. In a form in which a large number of target portions are provided at intervals, it is desirable to set the target area to a size that includes 10 or more target portions and obtain the area ratio. For example, the area ratio of the holes can be measured by the following procedure using, for example, VHX-1000, which is a trade name of KEYENCE, and the measurement conditions are set to 20 times.
(1) Set it on a 20x lens and adjust the focus. Adjust the position of the non-woven fabric so that the holes are 4x6.
(2) Specify the brightness of the hole area and measure the hole area.
(3) Click the color extraction of "Area measurement" in "Measurement / Comment". Click on the hole.
(4) Click "Batch measurement", check "Display measurement result window", and save as CSV data.

-"Elongation rate" means a value when the natural length is 100%.

-"Gel strength" is measured as follows. Artificial urine (urea: 2% by mass, sodium chloride: 0.8% by mass, calcium chloride dihydrate: 0.03% by mass, magnesium sulfate heptahydrate: 0.08% by mass, and ion-exchanged water: 97 Add 1.0 g of a highly absorbent polymer to 49.0 g (a mixture of .09% by mass) and stir with a stirrer. The produced gel is left in a constant temperature and humidity chamber at 40 ° C. × 60% RH for 3 hours, then returned to room temperature, and the gel strength is measured with a card meter (Curdmeter-MAX ME-500 manufactured by I. techno Engineering).

・ "Metsuke" is measured as follows. After pre-drying the sample or test piece, leave it in a test room or device in a standard state (the test place is a temperature of 20 ± 5 ° C. and a relative humidity of 65% or less) to bring it into a constant weight state. Pre-drying refers to making a sample or test piece constant in an environment where the relative humidity is 10 to 25% and the temperature does not exceed 50 ° C. For fibers having an official moisture content of 0.0% by mass, it is not necessary to perform pre-drying. Using a paper density plate (200 mm x 250 mm, ± 2 mm), cut out a sample with dimensions of 200 mm x 250 mm (± 2 mm) from the test piece in a constant weight state. Weigh the sample, multiply it by 20 to calculate the weight per square meter, and use it as a basis weight.

-The "thickness" is automatically measured using an automatic thickness measuring device (KES-G5 handy compression measurement program) under the conditions of a load of 10 gf / cm ² and a pressurized area of 2 cm ² .

-The water absorption amount is measured by JIS K7223-1996 "Water absorption amount test method for highly water-absorbent resin".

-The water absorption rate shall be the "time to the end point" when JIS K7224-1996 "Water absorption rate test method for highly water-absorbent resin" was performed using 2 g of highly absorbent polymer and 50 g of physiological saline. ..

-"Unfolded state" means a state in which the unfolded state is flat without shrinkage or slack.

-Unless otherwise specified, the dimensions of each part mean the dimensions in the unfolded state, not in the natural length state.

-If there is no description of the environmental conditions in the test or measurement, the test or measurement shall be performed in a test room or equipment under standard conditions (test location: temperature 20 ± 5 ° C, relative humidity 65% or less). ..

Next, Examples and Comparative Examples will be shown to clarify the effect of the present invention on suppressing inflammation of mainly injured skin.

<Test>
Samples (Comparative Example 3 and Comparative Example 4) to which nothing was applied to the air-through non-woven fabric and spun-bonded non-woven fabric, which are the materials of the top sheet 30, and 96% by mass of polyhydric alcohol (mixed liquid containing glycerin). Samples (Examples 1 and 2) in which a lotion application region was schematically formed by applying a mixed solution containing 2% by mass of a fatty acid (mainly oleic acid) polyhydric alcohol (mixture containing glycerin). Samples (Comparative Example 1 and Comparative Example 2) to which only the liquid) was applied were prepared, and the effects of the water evaporation amount and the keratin water content on the skin of the subject were measured and evaluated.
The air-through nonwoven fabric was manufactured by an air-through method having a basis weight of 20 g / m ² and was 2.0 to 2.2 dtex with PE / PET = 50/50 as a fiber material.
The spunbonded non-woven fabric was manufactured by a spunbonding method having a basis weight of 20 g / m ² , and was made of PP as a fiber material at 2.8 dtex.
Both air-through non-woven fabric and spunbonded non-woven fabric are common materials as top sheets for disposable diapers for infants.
The amount of the mixed solution applied in Examples 1 and 2 and the amount of glycerin applied in Comparative Examples 1 and 2 were both set to 8.5 g / m ² .

<Measurement method>
The measurement method was as follows (1) to (6).
(1) Three points on the inside of the forearm of 10 subjects are set as measurement points, and the measurement points are marked, and the amount of water evaporation and the amount of keratin water at the measurement points are measured, and these are used as the measured values of the blank. A portable moisture transpiration meter (VapoMeter SWL5001 manufactured by Delfin Technologies) was used to measure the water evaporation amount, and a portable keratin moisture meter (MoistureMeter SC Compact MSC1001 manufactured by Delfin Technologies) was used to measure the keratin moisture content. (2) The same applies to the following measurements.
(2) Cover the measurement site with one piece of non-woven fabric (regular rayon spun lace 99 g / m ² ) cut into 20 mm × 20 mm, and add about 10 drops of ion-exchanged water to the entire non-woven fabric to moisten the non-woven fabric. Cover the entire moistened non-woven fabric with a waterproof film cut to 30 mm (manufactured by Hakujuji Co., Ltd., FC waterproof film Free Cut M, L, and the protective film is not removed), and leave it for 1 hour on the subject's skin. Causes water damage.
(3) Remove the waterproof film and the moistened non-woven fabric, and leave it for 30 minutes to dry the measurement site. (4) Measure the amount of water evaporation and the amount of keratin water after water damage, and use it as the measured value after water damage.
(5) Next, the measurement site is covered with one sample (Example and Comparative Example) cut into 20 mm × 20 mm, the entire sample is covered with a waterproof film, and the sample is left for 1 hour.
(6) Remove the waterproof film and the sample, measure the amount of water evaporation and the amount of keratin water at the measurement points, and use them as the measured values of Examples and Comparative Examples.
As the significant difference test method, the significant difference was tested by the paired Bonferroni method. *: P <0.05, **: P <0.01 were judged to have a significant difference.

<Evaluation method>
It was decided to evaluate the damage to the skin from the difference between the measured value of the blank and the measured value of the example and the comparative example, and the difference between the measured value after the water damage and the measured value of the example and the comparative example.

The results are shown in Table 1.

According to this, in Examples 1 and 2, the water content evaporation amount is suppressed to a low level with a significant difference, and an increase in the keratin water content can be confirmed. It can be confirmed that the top sheet has the effect of suppressing inflammation of the injured skin.

The present invention can be used for tape-type disposable diapers, pad-type disposable diapers, and pants-type disposable diapers in general.

11 ... Liquid impermeable sheet, 20 ... Cover non-woven fabric, 20H ... Hot melt adhesive, 14 ... Opening, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorbent element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... Side gathers, 62 ... Gathered non-woven fabric, LD ... Front-back direction, LO ... Leg opening, T ... Waist circumference area, U ... Waist lower part, W ... Waist part, WD ... Width direction, WO ... Waist opening, M , Ma, Mb, Mc ... Lotion agent application area

Claims (7)

In a disposable diaper having a top sheet constituting the front surface on the use side, a liquid impermeable sheet provided on the back surface side, and an absorbing element interposed between them.
The top sheet has a lotion application area containing at least one of a fatty acid and a fatty alcohol and a polyhydric alcohol.
Disposable diapers featuring that. The disposable diaper according to any one of claims 1, wherein at least one of the fatty acid and the fatty alcohol and the polyhydric alcohol are liquid at room temperature. The disposable diaper according to claim 2, wherein the lotion agent application area contains at least one of a fatty acid and an aliphatic alcohol in an amount of 0.01 to 4% by mass based on the polyhydric alcohol. The disposable diaper according to any one of claims 1 to 3, wherein the lotion agent application area is unevenly distributed on the surface side of the top sheet. The disposable diaper according to claim 1, wherein the lotion agent application area has a plurality of compartments having different mass ratios of at least one of a fatty acid and a fatty alcohol and a polyhydric alcohol. The lotion application area has side edge sections, side sections and central sections that are adjacent in the width direction and along the anteroposterior direction.
Claimed that the side edge section and the central section have a smaller amount of at least one of a fatty acid and a fatty alcohol and a polyhydric alcohol with respect to the side section sandwiched between the side edge section and the central section. Disposable diaper described in 5. The disposable diaper according to any one of claims 1 to 6, wherein the top sheet is a non-woven fabric containing synthetic fibers.

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