JP5610801B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article such as a disposable paper diaper, a sanitary napkin, a urine picking pad, etc., on which water repellent printing is applied on the surface of a top sheet.

In the case of absorbent articles such as disposable paper diapers, sanitary napkins, urine absorption pads, etc., in order to protect the wearer's skin, embossing is applied to the part of the surface sheet that comes into contact with the wearer's skin, and drugs such as lotion Improvements have been made in the breathability and flexibility of the surface sheet, for example, by applying or producing a surface sheet using fibers kneaded with a chemical such as lotion.
Various improvements have also been made to suppress the occurrence of wetback that causes wearer's skin fog.
For example, by providing an intermediate sheet between the top sheet and the absorbent element to make the intermediate sheet bulky, the distance between the top sheet and the absorbent element is widened, or an intermediate sheet having a large number of voids or an embossed intermediate sheet Reduce the amount of water retained in the intermediate sheet, or provide an intermediate sheet with higher hydrophilicity than the top sheet to quickly absorb the excrement such as urine excreted on the top sheet into the absorbent element. Improvements have been made to suppress the occurrence of wetback, such as preventing the urine absorbed in the back from returning to the top sheet.
In order to effectively suppress the occurrence of wet bags, it is important to provide an intermediate sheet having a higher hydrophilicity than the top sheet, and to make the hydrophilicity of the top sheet and the hydrophilicity of the intermediate sheet greatly different, A method of making the hydrophilicity of the surface sheet and the intermediate sheet greatly different by using a surface sheet having low hydrophilicity has been performed.

JP 2006-61175 A JP 2003-12490 A Japanese Patent Laid-Open No. 2005-278885 JP 2005-52186 A JP 2009-172363 A

However, when a surface sheet having low hydrophilicity is used, wettability between the surface sheet and urine is deteriorated, and urine is repelled by the surface sheet, and urine does not permeate the surface sheet and may cause leakage. In addition, when urination is performed a plurality of times, urine remains as urine droplets on the surface of the surface sheet, which may cause wearer's skin to be blurred.
On the other hand, when a highly hydrophilic surface sheet is used, the difference between the hydrophilicity of the surface sheet and the intermediate sheet is reduced, so that when the wearer's body pressure is applied to the absorbent element, the urine absorbed by the absorbent element is absorbed. There was a risk of causing the wearer's skin to be fogged because the element easily returned to the surface sheet through the intermediate sheet.
Therefore, the main problem of the present invention is to apply water-repellent printing to a portion of the surface sheet that contacts the skin of the wearer, and to reduce the area ratio occupied by the water-repellent printing to a certain value or less, so that urine excreted on the surface sheet It is an object of the present invention to provide an absorbent article in which the absorbent element absorbs urine quickly and less wetback of the urine once absorbed by the absorbent element to the top sheet.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
In an absorbent article in which an absorbent element is interposed between a front sheet disposed on the front surface side and a liquid-impermeable back sheet disposed on the back surface side,
A hydrophilic intermediate sheet is disposed between the top sheet and the absorbent element,
Facing the absorbent element in the topsheet, and, 10 to 30 mm from the direction of the trailing edge of the absorbent element from the front direction of the edge and 10 to 30 mm spaced ventral centerline to the inside of the absorbent element in the topsheet inside The water repellent part is applied only to the region located between the separated back side center line ,
The area ratio (S) calculated from the area (S1) provided with the water repellent portion / the area (S2) facing the absorbent element of the top sheet × 100 is 10 to 30%,
In the rectangular area of any 10 mm ² in the region, characterized in that 1 to 5 mm ² or more of the water-repellent portion is applied, the absorbent article.

(Function and effect)
The present invention faces the absorbent element in the topsheet, and 10 from the direction of the trailing edge of the absorbent element from the front direction of the edge and 10~30mm spaced ventral centerline to the inside of the absorbent element in the topsheet inside Calculated from the area (S1) where the water-repellent part is given only in the region located between the center line and the back side center line spaced 30 mm apart, and the area (S2) facing the absorbent element of the topsheet Since the area ratio (S) is 10 to 30%, the hydrophilicity of the intermediate sheet is higher than the hydrophilicity of the topsheet in the region most frequently in contact with the wearer. It is possible to suppress wetback in which the urinated urine is quickly absorbed by the absorbent element and the urine absorbed by the absorbent element returns from the absorbent element to the top sheet through the intermediate sheet.
Further, since the water-repellent portion in the region between the direction of the edge and dorsal centerline after between the absorbent element of the forward edge and ventral centerline of the absorbent element it is not provided in the surface sheet, the surface sheet Urine that diffuses in the front-rear direction can be reliably absorbed in the vicinity of the edge of the absorbent element in the front-rear direction, and leakage of urine to the outside of the absorbent article can be prevented.
Furthermore, since the area ratio (S) calculated from the area (S1) provided with the water repellent part and the area (S2) facing the absorbent element of the top sheet is 10 to 30%, the urination location of the top sheet Most of the urine urinated on the top sheet is quickly absorbed by the absorbent element, and less urine diffuses back and forth on the top sheet to prevent urine leakage outside the absorbent article. Can do.
Since a water repellent part of 1 to 5 mm ² or more is provided in an arbitrary rectangular area of 10 mm ^{2 in} the region, it becomes an obstacle to urine returning from the absorbent element to the top sheet through the intermediate sheet, thereby suppressing wet back. can do.

<Invention of Claim 2>
In the ventral side absorbent element formed by dividing the absorbent element into three in the front-rear direction, the crotch absorbent element, the ventral surface sheet of the top sheet facing the back side absorbent element, the crotch surface sheet, and the dorsal surface sheet,
The water repellent part of the ventral surface sheet is applied to the crotch side from the ventral center line in the front-rear direction of the ventral surface sheet,
The water repellent portion of the back surface sheet is applied to the crotch side from the back center line in the front-rear direction of the back surface sheet,
The area ratio (S) is 12.5 to 15% in the ventral surface sheet, 2.5 to 5.0% in the crotch surface sheet, and 10.0 to 12 in the back surface sheet. The absorbent article according to claim 1, which is 5%.

(Function and effect)
In the invention which concerns on Claim 2, the water-repellent part of the abdominal surface sheet is given to the crotch side from the abdominal center line of the front-back direction of the abdominal surface sheet, and the area ratio (S) in the abdominal surface sheet Is 12.5 to 15%, and even when a boy whose urination site is located on the ventral side is worn, urine urinated on the topsheet is quickly absorbed by the absorbent element, and The water repellent portion applied to the ventral surface sheet becomes an obstacle to urine that returns from the absorbent element to the ventral surface sheet via the intermediate sheet, and can suppress wetback.
Moreover, since the area ratio (S) in the crotch surface sheet is 2.5 to 5.0%, urine urinated on the surface sheet is quickly absorbed by the absorption element, and multiple urinations are performed. Even in this case, urine can be prevented from remaining on the crotch surface sheet.
Further, the water-repellent part of the back surface sheet is applied to the crotch side from the back center line in the front-rear direction of the back surface sheet, and the area ratio (S) in the back surface sheet is 10.0 to 12.5%. Therefore, even when a girl whose urination site is located on the back side from the crotch is worn, urine urinated on the top sheet is quickly absorbed by the absorbent element, and the back top sheet The water-repellent portion applied to the urine becomes an obstacle to urine that returns from the absorbent element to the back surface sheet via the intermediate sheet, and wet back can be suppressed.

<Invention of Claim 3>
2. The intermediate sheet has a large number of apertures, and the water-repellent portion is applied to a fixing region where the top sheet, the non-opening portion of the intermediate sheet, and the absorbent element are fixed. Or the absorbent article of 2.

(Function and effect)
In the invention according to claim 3, since the intermediate sheet has a large number of openings, the hydrophilicity of the intermediate sheet is much higher, and urine discharged on the top sheet can be absorbed into the absorbent element more quickly. .
Further, since the water repellent part is applied to the fixing area where the non-opening part of the top sheet and the intermediate sheet and the absorbing element are fixed, it becomes an obstacle to urine that returns from the absorbing element to the top sheet through the intermediate sheet. Wet back can be effectively suppressed.
In addition, in the opening part of an intermediate sheet, since capillary force does not work, urine absorbed by the absorption element does not return.

<Invention of Claim 4>
4. The intermediate sheet according to claim 1, wherein the intermediate sheet is bulky, has a basis weight of 20 to 80 g / m ² , an aperture ratio (s) of 20 to 50%, and a diameter of the aperture of 0.05 to 2 mm. Absorbent article as described in 1.

(Function and effect)
The invention according to claim 4 is bulky and has a basis weight of 20 to 80 g / m ² , so that the installation interval between the topsheet and the absorbent element can be maintained widely, and thus wetback can be further suppressed. .
Moreover, since the aperture ratio (s) is 20 to 50% and the diameter of the aperture is 0.05 to 2 mm, the urine absorbed by the absorption element can reduce the return path.

<Invention of Claim 5>
The absorbent article according to any one of claims 1 to 4, wherein the water repellent part is applied by printing.

(Function and effect)
In the invention according to claim 5, since the water-repellent part is applied by printing, the friction coefficient of the water-repellent part of the surface sheet is small and the skin is not damaged even if it contacts the wearer's skin.

<Invention of Claim 6>
The print dot printing is performed by printing, the absorbent article according to claim 5 wherein the dot diameter is 0.05 to 1 mm.

(Function and effect)
The invention according to claim 6, dot printing is performed by the print printing, dot diameter, since it is 0.05 to 1 mm, to obtain a good printing appearance, particularly when the infant is wearing, It can attract the interest of infants.

  As described above, according to the present invention, urine excreted on the topsheet can be quickly absorbed by the absorbent element, and wetback in which the urine absorbed by the absorbent element returns to the topsheet can be suppressed. Advantages such as prevention of urine leakage to the outside can be brought about.

It is a top view in the state where the diaper was developed showing the inside of the underpants type disposable diaper in which the water repellent part was given. It is the elements on larger scale of FIG. It is a top view in the state where the diaper was developed showing the inside of a pants type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a pants type disposable diaper. FIG. 3 is a cross-sectional view taken along the line 3-3 in FIG. 3. FIG. 4 is a sectional view taken along line 4-4 of FIG. 3. FIG. 5 is a sectional view taken along line 5-5 in FIG. 3. It is a top view in the state where the diaper was developed showing only the principal part of a pants type disposable diaper. It is sectional drawing which shows only the principal part of a pants type disposable diaper. It is a perspective view of a pants type disposable diaper.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1 to 10 show an example 100 of a pants-type disposable diaper. In addition, this invention is not limited to an underpants type disposable diaper, It can apply to a tape-type disposable diaper, a sanitary napkin, and a urine collecting pad.

“Area (S1) provided with a water-repellent part” and “Area (S2) facing the absorbent element of the top sheet” in the claims mean “S1” and “S2” in FIG.
“Ventral absorption element”, “crotch absorption element”, and “dorsal absorption element” mean “HY”, “KY”, and “SY” in FIG. 1, and “ventral center” means ventral side 1 is a center line in the front-rear direction of the absorbent element and means “CH” in FIG. 1, and “back center” is a center line in the front-rear direction of the back side absorbent element and means “CS” in FIG. “Abdominal surface sheet”, “groin surface sheet”, and “back surface sheet” mean “HS”, “KS”, and “SS” in FIG. 1.

  The pants-type disposable diaper 100 is composed of an exterior sheet 12 that forms the outer surface (back surface) of the product, and an interior body 200 that is attached to the inner surface of the exterior sheet. The interior body 200 is a part that absorbs and holds excrement such as urine, and the exterior sheet 12 is a part that is worn by the wearer. In addition, the dot pattern part in sectional drawing has shown the junction part which joins each structural member, and is formed by solid, beads, curtains, summits, spiral application, etc., such as a hot-melt-adhesive. The “front-rear direction” means the direction connecting the ventral side (front side) and the back side (rear side), “width direction” means the direction (left-right direction) orthogonal to the front-rear direction, and “up-down direction "In the state of wearing the diaper 100, that is, the direction perpendicular to the waistline direction when the diaper 100 is folded in two at the crotch portion so that both sides of the front body and the back body side of the diaper 100 are overlapped, in other words, For example, it means a direction connecting the waist opening portion WO side and the crotch portion side.

(Interior body)
The interior body 200 can take any shape, but is rectangular in the illustrated form. As shown in FIGS. 5 to 7, the interior body 200 includes a surface sheet 30 on the body side, a liquid-impermeable back sheet 11, and an absorbent element 50 interposed therebetween. It is the main body that takes up the absorption function. Reference numeral 40 denotes an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent element 50. Shows barrier cuffs 60 that stand on the body side and are provided on both sides of the interior body 200 in order to prevent excrement from leaking to both sides of the interior body 200.

(Surface sheet)
The top sheet 30 has a property of transmitting liquid, and examples thereof include a porous or non-porous nonwoven fabric, a porous plastic sheet, and the like. Of these, the nonwoven fabric is not particularly limited as to what the raw fiber is, but is preferably a long fiber from the viewpoint of generating the water repellent portion 35. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. For example, if flexibility and drapeability are required, the spunbond method and spunlace method are preferable. If bulkiness and softness are required, the air-through method, point bond method, and thermal bond method are preferable processing methods. .

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

  When the barrier cuff 60 is provided, both sides of the top sheet 30 pass between the liquid-impervious back sheet 11 and the barrier cuff 60 to the back side of the absorbent element 50 to prevent the penetration of the liquid. It is preferable to adhere to the liquid-impermeable back sheet 11 and the barrier cuff 60 with a hot melt adhesive or the like.

(Water repellent part)
As shown in FIG. 1, a water repellent portion 35 is provided in a region of the top sheet 30 facing the absorbing element 50.
The ventral surface sheet (HS) of the topsheet 30 facing the ventral absorbent element (HY) obtained by dividing the absorbent element 50 into three in the front-rear direction has a crotch from the ventral center of the ventral absorbent element (HY) in the front-rear direction. A water repellent portion 35 having an area ratio of 12.5 to 15% is provided in the side region.

  When the area ratio is 12.5% or less, the urine absorbed in the absorbent element 50 is applied to the ventral surface sheet (HS) through the intermediate sheet 40 when the wearer's body pressure is applied to the absorbent element 50. There is a risk of going back to the surface. On the other hand, when the area ratio is 15% or more, especially when a boy whose urination site is located on the ventral side wears the pants-type disposable diaper 100, the water-repellent part 35 becomes an obstacle on the ventral surface sheet (HS). The urinated urine is not quickly absorbed by the absorbent element 50, and there is a possibility that urine leaks out of the pants-type disposable diaper 100.

  The crotch surface sheet (KS) of the top sheet 30 facing the crotch absorbent element (KY) obtained by dividing the absorbent element 50 into three in the front-rear direction has an area ratio of 2.5 to 5 in the entire region of the crotch surface sheet (KS). A 0.0% water-repellent portion 35 is provided.

  When the area ratio is 2.5% or less, the surface of the crotch surface sheet (KS) passes through the intermediate sheet 40 when the urine absorbed by the absorbent element 50 is applied to the absorbent element 50 by the wearer's body pressure. There is a risk of going backwards. On the other hand, when the area ratio is 5.0% or more, the water-repellent portion 35 becomes an obstacle, and the urine discharged on the crotch surface sheet (KS) is not quickly absorbed by the absorbent element 50, and urinated over a plurality of times. When this is performed, urine remains on the crotch surface sheet (KS), and the wearer's skin may be fogged.

  The back side surface sheet (SS) of the top sheet 30 facing the back side absorbent element (SY) obtained by dividing the absorbent element 50 into three in the front and back direction includes a crotch from the back side center in the front and back direction of the back side absorbent element (SY). A water repellent portion 35 having an area ratio of 10.0 to 12.5% is provided in the side region.

  When the area ratio is 10.0% or less, the urine absorbed in the absorbent element 50 is applied to the back surface sheet (SS) via the intermediate sheet 40 when the wearer's body pressure is applied to the absorbent element 50. There is a risk of going back to the surface. On the other hand, when the area ratio is 12.5% or more, the water repellent part 35 becomes an obstacle when a girl whose urination site is located on the back side from the crotch wears the pants-type disposable diaper 100. The urine urinated on SS) is not quickly absorbed by the absorption element 50, and there is a risk that urine leaks out of the pants-type disposable diaper 100.

Depending on the size of the pants-type disposable diaper 100, the ventral center in the front-rear direction of the ventral absorbent element (HY) and the back-center in the front-rear direction of the back absorbent element (SY) are the front and rear of the absorbent element 50, respectively. Located 10 to 30 mm inward from the edge of the direction. Therefore, the ventral surface sheet (HS) of the topsheet 30 facing the outside from the ventral center in the front-rear direction of the ventral absorbent element (HY) and the back from the backside center in the front-rear direction of the back absorbent element (SY). The water-repellent part 35 is not provided in the back side absorption element (SY).
When the water-repellent part 35 is provided on the top sheet 30 that faces 10 to 30 mm from the edge in the front-rear direction of the absorbent element 50, urine transmitted in the front-rear direction on the surface of the top sheet 30 is not absorbed by the absorbent element 50, There is a risk of leakage to the outside of the pants-type disposable diaper 100.
Moreover, in the underpants type disposable diaper 100, the area ratio of the water repellent part 35 is about 20 to 26%.

  The relationship between the water-repellent part 35 and the intermediate sheet 40 is absorbed when the water-repellent part 35 of the top sheet 30 facing the second sheet 40 is 50% or less of the total area where the water-repellent part 35 is applied. The leakage caused by the inhibition can be prevented. It is suitable from the viewpoint of absorbability and moisture.

Water repellent portion 35, the water repellent ink dot print 38 of the grid-shaped to 1 to 5 mm ² is applied by the print printing means in a rectangular area of 10 mm ^2. Examples of the means for generating the water repellent part 35 include print printing, print transfer, spray application, and contact coating. When the water repellent part 35 is generated by print printing, the coefficient of friction of the water repellent part 35 is small, and the skin is in contact with the wearer's skin. Even if it does not hurt a wearer's skin, it is suitable. In addition, when the dot diameter of the dot print 38 is set to 0.05 to 1 mm, the print applied to the water repellent part 35 becomes clear and can attract the wearer's interest. Further, the water-repellent ink can be printed in a staggered pattern or a grid pattern.

Even in case of using the second sheet 40 having a plurality of apertures 45 to be described later, the dots printed to form a water-repellent portion 35 of the topsheet 40 apertures 45 of the second sheet 40 is not formed HiHiraku It is provided in the hole and is suitable from the viewpoint of preventing the urine absorbed by the absorbent element 50 from returning to the surface of the top sheet 40 via the second sheet 40.

(Water repellent ink)
The water-repellent ink for generating the water-repellent part 35 includes a modified polymer silica-based paint, a composite of an oil-based solvent and a dye, a mixture of non-ionic or anionic wax emulsion in ink mainly composed of medium, etc. However, it is preferable to use an oil-based ink in that the water-repellent ink does not bleed by contact with urine and printing is maintained, and two or more water-repellent inks may be used in combination.

  The color of the water-repellent ink can be determined as appropriate, and may be colorless, transparent, white, or a different color that is the same color as the surface sheet 50. In the former case, since the colors of the water repellent part 35 and the surface sheet 50 are similar, the water repellent part 35 is preferably concealed by the surface sheet 50. On the other hand, in the latter case, various designs can be printed on the water-repellent part 35, which arouses the wearer's interest and can be used for wisdom education.

  In the water-repellent ink, a deodorant, an antibacterial agent, a pH adjuster, a fragrance, a surfactant, and various indicators can be blended. In such a case, it is preferable to use a water-repellent ink in which microcapsules containing a deodorant or the like are mixed.

(Intermediate sheet)
An intermediate sheet (also referred to as “second sheet”) 40 having a higher liquid permeation rate than the top sheet 30 can be provided to quickly transfer the liquid that has passed through the top sheet 30 to the absorber. This intermediate sheet 40 not only improves the absorption performance of the absorbent by quickly transferring the liquid to the absorbent body, but also prevents the “reversed” phenomenon of the absorbed liquid from the absorbent body, so that the top sheet 30 is always dried. It can be made into the state which carried out.

Examples of the intermediate sheet 40 include the same material as the top sheet 30, spunlace, spunbond, SMS, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond or crepe paper, and a film sheet having many openings. it can. In particular, an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber 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. Basis weight is preferably ^{20~80g / m 2, 25~60g / m} 2 is more preferable. The thickness of the raw fiber of the nonwoven fabric is preferably 2.2 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use an eccentric fiber, a hollow fiber, or an eccentric and hollow fiber that does not have a core at the center as the mixed fiber of all or part of the raw fiber.

As shown in FIG. 2, a large number of apertures 45 are formed in the intermediate sheet 40. The diameter of the aperture 45 is 0.05 to 2.0 mm, preferably 0.1 to 1.0 mm, the number of apertures is about 200 to 600 / cm ² , and the aperture ratio is 20 to 50%. Is desirable. In order to form the opening 45, the intermediate sheet 40 before opening is positioned on the upper surface of the support having a large number of openings, and is sucked from below the support, or air pressure is applied from the upper surface of the support. It can be formed by a method such as pressurizing.

  The intermediate sheet 40 in the illustrated form is disposed in the center shorter than the width of the absorber 56, but may be provided over the entire width. The length of the intermediate sheet 40 in the longitudinal direction may be the same as the length of the absorbent body 56 or may be within a short length range centered on the region that receives the liquid.

(Impermeable liquid back sheet)
The material of the liquid-impermeable back sheet 11 is not particularly limited. 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 plastic Examples thereof include a laminated sheet in which a nonwoven fabric or the like is laminated on a film and joined. For the liquid-impermeable back sheet 11, it is preferable to use a liquid-impervious and moisture-permeable material that has been preferred in recent years from the viewpoint of preventing stuffiness. As a plastic film having moisture permeability, a microporous plastic film obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching in a uniaxial or biaxial direction. Is widely used. In addition, non-woven fabric using micro-denier fibers, leakproof reinforcement by reducing the voids of the fibers by applying heat or pressure, and methods such as applying a superabsorbent resin or hydrophobic resin or water repellent Accordingly, a sheet that is liquid-impermeable without using a plastic film can also be used as the liquid-impermeable back sheet 11.

  The liquid-impermeable back sheet 11 is preferably extended to both sides of the side surface 30 of the absorbent element 50 by wrapping around both sides of the absorbent element 50 in order to improve leakage resistance. The width of this extended portion is suitably about 5 to 20 mm on each of the left and right sides.

  Moreover, the excretion indicator from which a color changes by absorption of a liquid part can be provided in the inner side of the liquid-impermeable back sheet 11, especially the absorber 56 side surface.

(Barrier cuffs)
The barrier cuff 60 is a belt-like member that extends over the entire front and rear direction along both side portions of the interior body 200, blocks urine and soft stool that move laterally along the top sheet 30, and prevents side leakage. It is provided for this purpose. The barrier cuff 60 of the present embodiment is provided so as to stand up from the side portion of the interior body 200, the base side portion stands up obliquely toward the center in the width direction, and the tip side portion from the intermediate portion has a width. It stands up diagonally outward in the direction.

  More specifically, the barrier cuff 60 is formed by folding a belt-like barrier sheet 62 having a length equal to the length in the front-rear direction of the interior body 200 and folding it in the width direction. In addition, a plurality of elongated elastic elastic members 63 are fixed along the longitudinal direction at intervals in the width direction. An end of the barrier cuff 60 opposite to the folded portion in the width direction is an attachment portion 65 fixed to the back surface of the side edge of the interior body 200, and portions other than the attachment portion 65 protrude from the attachment portion 65. It is set as the protrusion part 66 (part by the side of a folding | turning part). Further, both end portions in the front-rear direction of the protruding portion 66 extend from the mounting portion 65 to the side surface of the topsheet 30 through the side portion of the interior body 200 and are hot-melted to the side surface of the topsheet 30. The base side portion is fixed to the front and rear fixing portion 67 by an adhesive or heat seal, and the tip side portion is folded back outward in the width direction from the tip of the base side portion and fixed to the base side portion. An intermediate part in the front-rear direction of the protruding part is an unfixed free part (inner free part), and an elongated elastic member 63 extending in the front-rear direction is fixed to the free part in an extended state.

The barrier sheet 62 is made of a spunbonded nonwoven fabric (SS, SSS, etc.), SMS nonwoven fabric (SMS, SSMMS, etc.), a melt-blown nonwoven fabric having excellent uniformity and concealment, and water repellent with silicon as necessary. A treated product can be suitably used, and the fiber basis weight is preferably about 10 to 30 g / m ² . As the elongated elastic elastic member 63, rubber thread or the like can be used. When spandex thread rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation rate at the time of fixation is preferably 150 to 350%, more preferably 200 to 300%. Further, as shown in the drawing, a waterproof film can be interposed between the barrier sheets folded in two.

  The number of the elongated elastic stretch members 63 provided in the free part of the barrier cuff 60 is preferably 2-6, and more preferably 3-5. The arrangement interval 60d is suitably 3 to 10 mm. If comprised in this way, in the range which has arrange | positioned the elongate elastic expansion-contraction member 63, it will become easy to contact | abut with respect to skin. The elongated elastic elastic member 63 may be disposed not only at the distal end side but also at the base side.

  The fixing target of the attachment portion 65 of the barrier cuff 60 can be an appropriate member such as the top sheet 30, the liquid-impermeable back sheet 11, the absorbent element 50 in the interior body 200.

  In the barrier cuff 60 thus configured, the contraction force of the elongated elastic elastic member 63 acts to bring the both ends in the front-rear direction close to each other, but the both ends of the projecting portion 66 are fixed so that they do not stand up. On the other hand, since they are non-fixed free portions, only the free portions stand so as to abut on the body side as shown in FIG. In particular, when the attachment portion 65 is located on the back surface side of the interior body 200, the barrier cuff 60 stands up so that the barrier cuff 60 opens outward in the width direction at and around the crotch portion. It comes in contact, and the fit is improved.

  Although the dimensions of the barrier cuff 60 can be determined as appropriate, in the case of an infant paper diaper, for example, as shown in FIG. 9, the standing height of the barrier cuff 60 (width direction length of the protruding portion 66 in the unfolded state) W6 is It is preferably 15 to 60 mm, particularly 20 to 40 mm. In addition, when the barrier cuff 60 is flatly folded so that the barrier cuff 60 is parallel to the surface of the top sheet 30, the distance W3 between the innermost folds is preferably 60 to 190 mm, particularly preferably 70 to 140 mm.

  Unlike the illustrated embodiment, double (two rows) of barrier cuffs can be provided on the left and right sides of the interior body 200.

(Absorption element)
The absorbent element 50 includes an absorbent body 56 and a packaging sheet 58 that wraps the entire absorbent body 56. The packaging sheet 58 can be omitted.

(Absorber)
The absorber 56 can be formed of an aggregate of fibers. As this fiber assembly, a filament assembly obtained by opening as necessary a synthetic fiber tow (fiber bundle) such as cellulose acetate, in addition to those obtained by stacking short fibers such as cotton-like pulp and synthetic fibers Can also be used. The fiber basis weight can be set to, for example, about 100 to 300 g / m ² when cotton-like pulp or short fibers are stacked, and in the case of a filament aggregate, for example, about 30 to 120 g / m ^2. Can do. The fineness in the case of a synthetic fiber is 1-16 dtex, for example, Preferably it is 1-10 dtex, More preferably, it is 1-5 dtex. In the case of a filament aggregate, the filament may be a non-crimped fiber, but is preferably a crimped fiber. The crimped degree of the crimped fiber can be, for example, 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. Further, a crimped fiber that is uniformly crimped is often used. It is preferable to disperse and hold superabsorbent polymer particles in the absorber 56.

  The absorber 56 may have a rectangular shape, but as shown in FIG. 8, the hourglass has a front end portion, a rear end portion, and a constricted portion having a narrower width than the front end portion and the rear end portion. The shape is preferable because the fit of the absorbent body 56 and the barrier cuff 60 around the legs is improved.

  Moreover, although the dimension of an absorber can be determined suitably, it is preferable to extend to the peripheral part of the interior body, or its vicinity in the front-back direction and the width direction.

(Superabsorbent polymer particles)
The absorber 56 can contain superabsorbent polymer particles in a part or all thereof. Superabsorbent polymer particles include “powder” in addition to “particles”. As the particle diameter of the superabsorbent polymer particles, those used in this type of absorbent article can be used as they are, and those having a particle size of 1000 μm or less, particularly 150 to 400 μm are desirable. The material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable. High-absorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and sodium carboxymethylcellulose crosslinks. Or an acrylic acid (salt) polymer can be used. As the shape of the superabsorbent polymer particles, a commonly used granular material is suitable, but other shapes can also be used.

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

  Further, as the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. Thereby, even if it is a case where it is set as the bulky absorber 56, the sticky feeling after liquid absorption can be suppressed effectively.

The basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² . If the amount of polymer is less than 50 g / m ^2, it is difficult to secure the absorption amount. When it exceeds 350 g / m ² , the effect is saturated.

  If necessary, the superabsorbent polymer particles can adjust the spraying density or spraying amount in the plane direction of the absorber 56. For example, it is possible to increase the application amount of the liquid excretion site as compared to other sites. When gender differences are taken into account, men can increase the front spray density (amount), while women can increase the center spray density (amount). In addition, a portion where no polymer exists locally (for example, in a spot shape) in the planar direction of the absorber 56 can also be provided.

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

  The packaging form of the packaging sheet 58 can be determined as appropriate, but from the viewpoint of ease of manufacture and prevention of leakage of the superabsorbent polymer particles from the front and rear end edges, the cylinder is formed so as to surround the front and back surfaces and both side surfaces of the absorbent body 56. It is preferable that the front and rear edges of the absorbent body 56 are protruded from the front and back of the absorbent body 56, and the protruding portions are crushed in the front and back directions and joined by a joining means such as a hot melt adhesive.

(Exterior sheet)
The exterior sheet 12 has a front body F extending from the crotch part to the ventral side and a back body B extending from the crotch part to the back side, and both side parts of the front body F and both side parts of the back body B As shown in FIG. 10, a torso opening WO for passing the wearer's torso and a pair of left and right leg openings LO for passing the legs are formed. Reference numeral 12A denotes a joining portion (hereinafter, this portion is also referred to as a side seal portion). In addition, the crotch portion means the front-rear direction center from the waist edge of the front body to the waist edge of the back body in the unfolded state, and the front part and the back part thereof are the front body F and the back body. B means each.

  The exterior sheet 12 includes a trunk periphery T that is defined as a longitudinal range extending from the trunk opening WO to the upper end of the leg opening LO, and an intermediate portion L that is defined as a longitudinal range of a portion that forms the leg opening LO. The waistline portion T can be conceptually divided into a “waist side end” W and a “waistline lower portion” U. These lengths in the front-rear direction vary depending on the size of the product and can be determined as appropriate. For example, the waist side end portion W may be 15 to 40 mm, and the waist lower portion U may be 65 to 120 mm. . On the other hand, both side edges of the intermediate portion L are bundled along the circumference of the wearer's leg, and this is a portion into which the wearer's leg is put. As a result, the exterior sheet 12 has a substantially hourglass shape as a whole. The degree of tightness of the exterior sheet 12 can be determined as appropriate, and, as shown in FIGS. 3 to 10, the narrowest portion may be narrower than the width of the interior body 200 in order to obtain a clean appearance. Although it is preferable, the narrowest part may be determined so as to be equal to or larger than the width of the interior body 200.

  As shown in FIGS. 5 to 7, the exterior sheet 12 is formed by laminating two sheet base materials 12S and 12H with an adhesive such as a hot melt adhesive, and is an inner sheet positioned on the inner side. Although the base material 12H extends only to the edge of the waist opening WO, the outer sheet base material 12S wraps around the waist side edge of the inner sheet base material 12H and is folded back to the inside. 12r is extended so that it may coat | cover up to the waist side edge part of the interior body 200. FIG.

The sheet base materials 12S and 12H can be used without particular limitation as long as they are sheet base materials, but are preferably non-woven fabrics. The nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. When using a nonwoven fabric, it is preferable that the basic weight shall be about 10-30 g / m < ² >.

Moreover, it is preferable that the total basis weight of the exterior sheet 12 is about 20 to 60 g / m ² so that the design of the printing sheet 25 to be described later can be satisfactorily viewed from the outer surface of the product through the exterior sheet 12. The total light transmittance specified in 7105 is preferably 40% or more, particularly 50% or more.

  The exterior sheet 12 is provided with elongate elastic members 15 to 19 such as thread rubber between the sheet base materials 12S and 12H at a predetermined elongation rate in order to improve the fit to the waistline. As the elongated elastic elastic members 15 to 19, synthetic rubber or natural rubber may be used. For bonding the sheet bases 12S and 12H of the exterior sheet 12 and fixing the elongated elastic members 15 to 19 sandwiched therebetween, hot melt bonding or heat sealing or ultrasonic bonding by various coating methods is used. Can do. If the entire exterior sheet 12 is firmly fixed, the texture of the sheet is impaired, which is not preferable. By combining these, it is preferable that the elongated elastic elastic members 15 to 19 are firmly bonded, and other portions are not bonded or bonded weakly.

More specifically, the width between the inner surface of the inner sheet base 12H and the outer surface of the folded portion 12r of the outer sheet base 12S at the waist end (upper end) W of the rear body B and the front body F is a width. The plurality of waist elastic elastic members 17 and 18 are fixed in a state of being stretched along the width direction at a predetermined stretch rate at intervals in the vertical direction so as to be continuous over the entire direction. In addition, one or more of the waist elastic elastic members 17 and 18 disposed in a region adjacent to the waistline lower portion U may overlap with the interior body 200 or overlap with the interior body 200. You may each provide in the width direction both sides except the width direction center part. As the waist resilient and elastic members 17 and 18, the thickness 155～1880Dtex, particularly about 470～1240Dtex (the case of synthetic rubber. Cross-sectional area in the case of natural rubber 0.05 to 1.5 mm ^2, in particular 0.1 the rubber thread of 1.0mm about ^2), 3 to 22 present approximately at intervals of 4 to 12 mm, an extension ratio 150% to 400%, preferably fixed in particular about 220-320%. The waist elastic elastic members 17 and 18 need not all have the same thickness and expansion rate. For example, the elastic elastic members have different thicknesses and expansion rates at the upper and lower portions of the waist end W. Also good.

  Further, between the outer side surface of the inner sheet base material 12H and the inner side surface of the outer sheet base material 12S in the lower waist portion U of the front body F and the back body B, except for the central portion in the width direction that overlaps the interior body 200. A plurality of elongated elastic elastic members 15 and 19 are vertically spaced along the width direction at a predetermined stretch rate so as to be continuous over the entire width direction at each of the upper side and both sides in the width direction. It is fixed in a stretched state.

The elongated elastic elastic members 15 and 19 of the lower waist part U have a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , the rubber thread 0.1~1.0mm about ^2), 1 to 15 mm, particularly 5 to 30 present approximately at intervals of 3 to 8 mm, to secure in extension ratio 200 to 350%, particularly about 240 to 300% Is preferred.

  Moreover, between the outer side surface of the inner sheet base material 12H and the inner side surface of the outer sheet base material 12S in the intermediate part L of the front body F and the back body B, except for the center part in the width direction overlapping the interior body 200, A state in which a plurality of elongated elastic elastic members 16 are stretched along the width direction at a predetermined stretch rate at intervals in the vertical direction so as to be continuous over the entire width direction at each part on both sides in the width direction. It is fixed with.

The elongated elastic elastic members 16 and 18 of the intermediate portion L have a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, a cross-sectional area of 0.05 to 1.5 mm ² , The thread rubber of about 0.1 to 1.0 mm ² ) is fixed at 5 to 40 mm, particularly about 2 to 10 at intervals of 5 to 20 mm, respectively, with an elongation of 150 to 300%, particularly 180 to 260%. preferable.

  In addition, as shown in the drawing, the elongated elastic elastic members 15, 19, 16, and 18 of the lower waist portion U and the intermediate portion L are provided on both sides in the width direction except for the central portion in the width direction that overlaps the interior body 200. It is preferable that the interior body 200 does not shrink more than necessary in the width direction, and it does not look bad and does not deteriorate absorbability. In this form, in addition to the form in which the elastic stretchable member exists only on both sides in the width direction, the elastic stretchable member exists from one side of the width direction to the other side across the interior body 200, but overlaps the interior body 200. A configuration is also included in which the elastic stretchable member is cut at the center in the width direction so that the stretchable force does not act (substantially equivalent to not providing the elastic stretchable member). Of course, the arrangement of the elongated elastic members 15, 19, 16, 18 is not limited to the above example, and the elongated elastic expansion / contraction of the lower waistline U so that the elastic force acts on the entire widthwise direction of the lower waistline U. Part or all of the members 15, 19, 16, and 18 can be provided from one side in the width direction to the other side across the interior body 200.

  In addition, when the elongated elastic elastic members 15 to 19 cross a printing sheet 25 described later, when a rubber containing titanium oxide is used as the elongated elastic elastic members 15 to 19, the content of titanium oxide is low ( It is preferable to use those not containing titanium oxide (for example, 2% or less).

(Post-processing tape)
A post-processing tape 70 (fixing means) can be provided at the center in the width direction on the outer surface of the rear body B of the exterior sheet 12. The post-processing tape 70 is for fixing the diaper 100 in a state where the diaper 100 is rolled or folded so that the topsheet 30 is on the inside and the front body F is on the inside. As shown in FIG. 7, the general post-processing tape 70 has a base end portion 71 fixed to the outer surface of the exterior sheet 12 with an adhesive or the like, and a portion on the front end side of the base end portion 71 is tri-folded. (Folded in a Z-shaped cross section) or folded in half, and the portion between the folded portions is fixed (temporarily fixed) by the temporary fixing adhesive 72 so as to be peelable. Moreover, while having the knob | pick part 73 colored in opaque colors, such as white, in the front-end | tip part, the part except this knob | pick part 73 is transparent or semi-transparent, Through the transparent or semi-transparent part in this post-processing tape 70, A design to be described later is visible from the outer surface side of the post-processing tape 70. Although a specific structure can be appropriately configured, in the illustrated embodiment, the whole is formed by connecting a plurality of transparent or semi-transparent substrates in the longitudinal direction, and a colored tape 74 is bonded to the knob 73. Is adopted.

  At the time of disposal, the diaper 100 is rolled or folded so that the topsheet 30 is on the inside and the front body F is on the inside, and then the folded portion of the post-processing tape 70 is peeled off and spread, and the diaper 100 is rolled or folded. The diaper 100 is fixed with an adhesive so as to be wound from the rear body B of the diaper 100 over the waist opening WO to the outer surface on the opposite side. The post-processing tape 70 is particularly preferably a tri-fold shape that can be folded compactly when not in use and can be expanded into a long shape when in use.

  Fixing means such as the post-processing tape 70 may be provided on the front body F or on both the back body B and the front body F.

(Print sheet)
Between the liquid-impermeable back sheet 11 and the exterior sheet 12 (including the interlayer of the exterior sheet 12), a print sheet 25 that is designed by printing is provided. The exterior sheet 12 may be omitted, and the print sheet 25 may be exposed on the outer surface. The printed sheet 25 in the illustrated example has a smaller area than the body on which the printed sheet 25 is disposed, and is provided separately for the front body F and the back body B, but passes through the crotch from the front body F. It can also be provided so as to continue to the back body B integrally.

  Although the size and shape of the printing sheet 25 are not particularly limited, it is preferable to sufficiently increase the area in order to make the function sufficient. For example, the width of the printing sheet 25 is 50 to 120 of the width of the absorber 56. The length of the printing sheet 25 is preferably about 15 to 30% of the total length Y of the article on at least one side of the stomach side and the back side. Further, the shape of the print sheet 25 is preferably a rectangle as shown in the figure in that trim loss does not occur. However, the print sheet 25 has a geometric shape such as a circle, an ellipse, a triangle, a hexagon, or a shape along the periphery of the design. You may cut it.

As the sheet base material of the printing sheet 25, a plastic film, non-woven fabric, paper, or the like can be used, but a bulky material having high air permeability is preferable. When using a plastic film, it is desirable to have moisture permeability in order to prevent stuffiness. Nonwoven fabrics and paper are preferable because they have moisture permeability, and when performing design printing, it is preferable to use nonwoven fabrics that are smooth and easy to print, and papers that are high in strength and difficult to bleed ink. Particularly preferred are basis weight 15 to 35 g / m ² approximately, crepe paper having a thickness of about 0.1 to 0.3 mm (thin paper) and a basis weight 10 to 25 g / m ² approximately, a thickness of about 0.1 to 0.3 mm Non-woven fabrics (especially spunbond nonwoven fabrics and SMS nonwoven fabrics having a spunbond portion having a fineness of about 1.0 to 3.0 dtex). When crepe paper is used, the crepe rate is preferably about 5 to 20%, particularly about 5 to 15%. If the crepe rate is 20% or more, the amount of ink fixed increases, but blurring occurs and is not suitable for design printing. If the crepe rate is 5% or less, the amount of fixing is small because the ink hardly penetrates.

  The present invention can be used for a pants-type disposable diaper as in the above example.

  DESCRIPTION OF SYMBOLS 11 ... Liquid impervious back sheet, 12 ... Exterior sheet, 12r ... Folded part, 25 ... Print sheet, 200 ... Interior body, 30 ... Surface sheet, 35 ... Water-repellent part, 40 ... Intermediate sheet, 45 ... Opening, 50 ... Absorbing element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... Side barrier cuff, 62 ... Barrier sheet.

Claims (6)

In an absorbent article in which an absorbent element is interposed between a front sheet disposed on the front surface side and a liquid-impermeable back sheet disposed on the back surface side,
A hydrophilic intermediate sheet is disposed between the top sheet and the absorbent element,
Facing the absorbent element in the topsheet, and, 10 to 30 mm from the direction of the trailing edge of the absorbent element from the front direction of the edge and 10 to 30 mm spaced ventral centerline to the inside of the absorbent element in the topsheet inside The water repellent part is applied only to the region located between the separated back side center line ,
The area ratio (S) calculated from the area (S1) provided with the water repellent portion / the area (S2) facing the absorbent element of the top sheet × 100 is 10 to 30%,
In the rectangular area of any 10 mm ² in the region, characterized in that 1 to 5 mm ² or more of the water-repellent portion is applied, the absorbent article. In the ventral side absorbent element formed by dividing the absorbent element into three in the front-rear direction, the crotch absorbent element, the ventral surface sheet of the top sheet facing the back side absorbent element, the crotch surface sheet, and the dorsal surface sheet,
The water repellent part of the ventral surface sheet is applied to the crotch side from the ventral center line in the front-rear direction of the ventral surface sheet,
The water repellent portion of the back surface sheet is applied to the crotch side from the back center line in the front-rear direction of the back surface sheet,
The area ratio (S) is 12.5 to 15% in the ventral surface sheet, 2.5 to 5.0% in the crotch surface sheet, and 10.0 to 12 in the back surface sheet. The absorbent article according to claim 1, which is 5%. 2. The intermediate sheet has a large number of apertures, and the water-repellent portion is applied to a fixing region where the top sheet, the non-opening portion of the intermediate sheet, and the absorbent element are fixed. Or the absorbent article of 2. 4. The intermediate sheet according to claim 1, wherein the intermediate sheet is bulky, has a basis weight of 20 to 80 g / m ² , an aperture ratio (s) of 20 to 50%, and a diameter of the aperture of 0.05 to 2 mm. Absorbent article as described in 1.   The absorbent article according to any one of claims 1 to 4, wherein the water repellent part is applied by printing. The printed dot print 38 is applied by printing, the absorbent article according to claim 5 wherein the dot diameter is 0.05 to 1 mm.

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