JP6767130B2 - Disposable diapers - Google Patents

Description

The present invention relates to a disposable diaper, and more particularly to a disposable diaper having an improved appearance of the disposable diaper.

Conventionally, in order to prevent stuffiness inside a disposable diaper, a configuration has been proposed in which an opening is formed in the exterior sheet to improve the air permeability of the exterior sheet. (Patent Document 1)
Further, in order to improve the design of the liner, a configuration has been proposed in which the portion of the top sheet facing the design portion formed on the back sheet is embossed to improve the transparency. (Patent Document 2)

Japanese Unexamined Patent Publication No. 2015-128573 Japanese Unexamined Patent Publication No. 2014-97240

However, in the configuration of Patent Document 1, when the design formed on the back sheet is provided at a position extending between the non-opening and the opening of the exterior sheet, the design can be visually recognized from the outside of the disposable diaper via the exterior sheet. Since the lightness L ^* and the saturation C ^* are different from each other, the wearer or the like may think that the design located at the opening of the exterior sheet is a foreign substance adhering to the exterior sheet.

Similarly, in the configuration of Patent Document 2, when the design formed on the back sheet is provided at a position extending over the window portion having high transparency of the top sheet and a portion other than the window portion, the brightness L ^* and the color saturation of the design are similarly provided. Since the degree C ^* is different, there is a possibility that the appearance of the design that can be visually recognized from the outside of the liner via the top sheet is inferior.

Therefore, a main object of the present invention is to provide a disposable diaper having a design formed on an outer surface of a back sheet that can be visually recognized from the outside of the disposable diaper via an outer sheet.

The present invention that solves the above problems is as follows.
The invention according to claim 1 is provided between a liquid-permeable top sheet provided on the body side, a liquid-impermeable back sheet provided on the opposite body side, and the top sheet and the back sheet. In a disposable diaper provided with an absorber that absorbs excrement and an exterior sheet provided on the opposite side of the back sheet.
The outer surface of the backsheet, L ^* a ^* b ^* in the color system of the lightness L ^* of 30 or less, the chroma ^{C * (a 2 + b 2} ) a chroma C ^* of 60 or less which is calculated by ^1/2 A first design portion formed of a dark color and a second design portion formed of a light color having a brightness L ^* of 50 or more are provided, and the exterior sheet is provided with a non-opening portion and predetermined in the front-rear direction and the width direction. Disposable, characterized in that openings are provided at intervals, the entire first design portion is located in the non-opening, and the second design is located in the non-opening and the opening in an external plan view. It is a diaper.

The invention according to claim 2 is the disposable diaper according to claim 1, wherein the openings are provided at predetermined intervals in the front-rear direction and the width direction.

The invention according to claim 3 is the disposable diaper according to claim 1 or 2, wherein the basis weight of the exterior sheet is 10 to 50 g / m ² .

The invention according to claim 4 is the disposable diaper according to any one of claims 1 to 3, wherein the light transmittance of the exterior sheet is 60 to 90%.

According to the first aspect of the invention, the outer surface of the backsheet, L ^* a ^* b ^* color system of the lightness L ^* of 30 or less, calculated in the saturation ^{C * (a 2 + b 2} ) 1/2 A first design part formed of a dark color having a saturation C ^* of 60 or less and a second design part formed of a light color having a saturation L ^* of 50 or more are provided, and the exterior sheet has a non-opening and front and rear parts. Since openings are provided at predetermined intervals in the direction and the width direction, the entire first design portion is positioned in the non-opening, and the second design is positioned in the non-opening and the opening in the outer plan view. , The brightness L ^* and saturation C ^{* of} the first design part that can be seen from the outside of the disposable diaper through the exterior sheet are almost the same value, and the appearance of the disposable diaper can be improved without giving a sense of discomfort to the wearer or the like. ..
In addition, the brightness L ^* and the saturation C ^* of the first design portion of the back sheet are maintained at the same value, and the appearance of the disposable diaper can be enhanced without giving a sense of discomfort to the wearer or the like. Further, since the second design portion of the back sheet is light-colored, the second design portion covered by the non-opening of the exterior sheet and the second design portion located at the opening of the exterior sheet and not covered by the non-opening Since the difference in the value of the brightness L ^* is small, it is possible to prevent the appearance of the disposable diaper from being deteriorated without giving a sense of discomfort to the wearer or the like.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, the openings are provided at predetermined intervals in the front-rear direction and the width direction, so that the position shift in the width direction of the first design is provided. It is possible to easily manufacture disposable diapers by controlling the above.

According to the invention of claim 3, in addition to the effect of the invention of claim 1 or 2, since the outer sheet has a diaper of 10 to 50 g / m ² , the first design part and the second design are made depending on the outer sheet. The portion is not concealed, and the first design portion and the second design portion can be reliably visually recognized from the outside of the disposable diaper via the exterior sheet.

According to the invention of claim 4, in addition to the effect of the invention of any one of claims 1 to 3, the light transmittance of the exterior sheet is 60 to 90%, so that the exterior sheet is the first. The design part and the second design part are not concealed more, and the first design part and the second design part can be more reliably visually recognized from the outside of the disposable diaper through the exterior sheet.

It is an inner plan view which developed the disposable diaper. It is the outside plan view which developed the disposable diaper. It is a cross-sectional view of X1-X1 of FIG. It is a combination explanatory drawing of the design part of the back sheet of 1st Embodiment and the opening part of an exterior sheet. It is a combination explanatory drawing of the design part of the back sheet of 2nd Embodiment, and the opening part of an exterior sheet. It is a combination explanatory drawing of the design part of the back sheet of 3rd Embodiment, and the opening part of an exterior sheet. It is a combination explanatory drawing of the design part of the back sheet of 4th Embodiment, and the opening part of an exterior sheet. It is explanatory drawing of the position deviation inspection of the design part of a back sheet and the opening of an exterior sheet. It is an external photograph of the state where a part of the design part of the back sheet is covered by the exterior sheet.

<Disposable diaper 100>
The disposable diaper provided with the highly breathable exterior sheet of the present invention and having an excellent appearance in the design portion of the back sheet that can be visually recognized from the outside of the exterior sheet will be described with reference to the accompanying drawings. In the present specification, the "front-back direction" refers to the direction connecting the ventral side and the dorsal side, the "width direction" refers to the direction orthogonal to the front-back direction, and the "vertical direction" refers to the state in which a disposable diaper is worn. The direction orthogonal to the waist circumference direction, and the dark color means that the lightness L ^* in the L ^* a ^* b ^* color system (JIS Z8781-4) is 30 or less, and the saturation C ^* (c ^* = (a ² + b ^2). ) A color calculated by ^1/2 ) is 60 or less, and a light color is a color having a chromaticity L ^* of 50 or more.

As shown in FIGS. 1 to 3, the disposable diaper 100 includes a liquid-permeable top sheet 10 on the body surface side, a liquid-impermeable back sheet 11 on the anti-body surface side, and a top sheet 10 and a back sheet 11. It is formed from an absorbing element 20 sandwiched between them. An exterior sheet 12 is provided on the outer surface of the back sheet 11. It is preferable to provide an intermediate sheet 15 between the top sheet 10 and the absorbing element 20 to move the excrement that has passed through the top sheet 10 to the absorbing element 20 and prevent the excrement from returning.

Three-dimensional gathers 30 are provided on the left and right sides of the absorbing element 20 at predetermined intervals to prevent leakage of excrement to the outside, and outside the base of the three-dimensional gathers 30 at predetermined intervals. A flat gather 40 is provided to prevent leakage of urination to the outside.

End flap portions EF are provided on the front and rear sides of the absorbing element 20, side flap portions SF are provided on the left and right sides of the absorbing element 20, and fastening tape 50 is provided on the rear portion of the side flap portion SF. There is.

Next, the material and the characteristic portion of the top sheet 10 and the like will be described in order.
(Top sheet)
The top sheet 10 is made of a perforated or non-perforated non-woven fabric, a porous plastic sheet, or the like. In addition, 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, and mixed fibers and composite fibers in which two or more of these are used. Etc. can be exemplified. Further, the non-woven fabric may be produced 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 spunlace method is preferable, and if bulkiness and softness are required, the thermal bond method is preferable.

(Back sheet)
The back sheet 11 is a portion that prevents the excrement absorbed by the absorbing element 20 from being discharged to the outside. As shown in FIG. 4 and the like, it is preferable to print a floral pattern, an animal, or the like on the outer surface of the back sheet 11 and provide a design portion 60 on the outer surface of the back sheet 11 in order to enhance the appearance of the disposable diaper 100. ..

The back sheet 11 is an olefin resin such as polyethylene or polypropylene, a laminated non-woven fabric in which a non-woven fabric is laminated on a polyethylene sheet or the like, or a non-woven fabric in which a waterproof film is interposed to ensure substantially liquid impermeability (in this case, a non-woven fabric). The back sheet is composed of the non-woven fabric and the non-woven fabric.) Of course, in addition to this, a material having liquid impermeableness and moisture permeability, which has been favorably used from the viewpoint of preventing stuffiness in recent years, can also be exemplified. As the sheet of the material having liquid impermeability and moisture permeability, for example, an inorganic filler is kneaded in an olefin resin such as polyethylene or polypropylene, the sheet is molded, and then stretched in the uniaxial or biaxial direction. The microporous sheet thus obtained can be exemplified. Furthermore, it is waterproofed by a non-woven fabric using microdenyl fibers, enhanced leak resistance by reducing the air gaps of the fibers by applying heat or pressure, and coating with a super absorbent polymer or hydrophobic resin or water repellent. A liquid-impermeable sheet without using a film can also be used as the back sheet 11.

(Exterior sheet)
The exterior sheet 12 is a portion that supports the absorbing element 20 and is attached to the wearer. As shown in FIG. 4 and the like, an opening 66 is formed in the exterior sheet 12 in order to improve the air permeability of the exterior sheet 12 and prevent stuffiness inside the disposable diaper 100.

The exterior sheet 12 is preferably but not limited to being made of a non-woven fabric. The type of non-woven fabric is not particularly limited, and as the material fiber, for example, olefin-based fibers such as polyethylene or polypropylene, synthetic fibers such as polyester-based and polyamide-based, recycled fibers such as rayon and cupra, and natural fibers such as cotton are used. As the processing method, a spunlace method, a spunbond method, a thermal bond method, an air-through method, a needle punch method, or the like can be used. However, long-fiber non-woven fabrics such as spunbonded non-woven fabrics, SMS non-woven fabrics, and SMMS non-woven fabrics are preferable from the viewpoint of achieving both touch and strength. The non-woven fabric can be used alone or in layers. In the latter case, it is preferable to bond the non-woven fabrics to each other with a hot melt adhesive or the like. When a non-woven fabric is used, the fiber basis weight is preferably 10 to 50 g / m ² , particularly 15 to 30 g / m ² , and the light transmittance is preferably 60 to 90%, particularly 75 to 90%.

(Intermediate sheet)
The intermediate sheet 15 is made of the same material as the top sheet 10. The intermediate sheet 15 is preferably bonded to the top sheet 10, and when heat embossing or ultrasonic welding is used for the bonding, the material of the intermediate sheet 15 is preferably one having a melting point similar to that of the top sheet 10. When a non-woven fabric is used for the intermediate sheet 15, the fineness of the fibers of the non-woven fabric is preferably about 2.0 to 7.0 dtex.

(Absorption element)
The absorbing element 20 is formed of an absorber 21 and a packaging sheet 22 that wraps the absorber 21.

(Absorber)
The absorber 21 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 necessary. Can also be used. The basis weight of fibers, when fiber stacking flocculent pulp or short fibers, for example, be a 100 to 300 g / m ² approximately, in the case of a filament aggregate, for example, be 30 to 120 g / m ² approximately 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 filament aggregates, the filaments may be non-crimped fibers, but are preferably crimped fibers. The degree of crimping of the crimped fibers can be, for example, 5 to 75 fibers per inch, preferably 10 to 50 fibers, and more preferably about 15 to 50 fibers. In many cases, uniformly crimped crimped fibers are used.

The absorber 21 preferably contains the highly absorbent polymer particles, and in particular, at least in the liquid receiving region, the highly absorbent polymer particles (SAP particles) are substantially dispersed in the entire thickness direction with respect to the aggregate of fibers. Is desirable.

If there are no or very few SAP particles in the upper, lower, and middle parts of the absorber 21, it cannot be said that they are "dispersed in the entire thickness direction". Therefore, "distributed in the entire thickness direction" means that the fibers are "uniformly" dispersed in the entire thickness direction, as well as "unevenly distributed" in the upper part, the lower part, and / or the intermediate part. However, it also includes forms that are still dispersed in the upper, lower, and middle parts. Further, the form in which some SAP particles do not enter the fiber aggregate and remain on the surface thereof, and the form in which some SAP particles pass through the fiber aggregate and are on the packaging sheet 22 are also excluded. It's not something.

The highly absorbent polymer particles include "powder" in addition to "particles". The particle size of the highly absorbent polymer particles can be the same as that used for this kind of absorbent article, and is preferably 1000 μm or less, particularly 150 to 400 μm. 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, cellulosic-based and synthetic polymer-based ones, such as starch-acrylic acid (salt) graft copolymer, saponified product of starch-acrylonitrile copolymer, and cross-linking of sodium carboxymethyl cellulose. A product, an acrylic acid (salt) polymer, or the like can be used. The shape of the highly absorbent polymer particles is preferably a powder or granular material that is usually used, but other shapes can also be used.

The highly absorbent polymer particles preferably have a water absorption rate of 70 seconds or less, particularly 40 seconds or less. If the water absorption rate is too slow, so-called reversion, in which the liquid supplied into the absorber 21 returns to the outside of the absorber 21, tends to occur.

The basis weight of the highly absorbent polymer particles can be appropriately determined according to the amount of absorption required for the application of the absorber 21. 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. If it exceeds 350 g / m ² , not only the effect is saturated, but also the excess of highly absorbent polymer particles gives a jerky discomfort.

(Packaging sheet)
The packaging sheet 22 is made of tissue paper, particularly crepe paper, non-woven fabric, non-woven fabric of polylami, a sheet having small holes, or the like. However, it is desirable that the sheet does not allow the highly absorbent polymer particles to escape. When a non-woven fabric is used instead of the crepe paper, a hydrophilic SMMS (spunbond / meltblown / meltblown / spunbond) non-woven fabric is particularly preferable, and polypropylene, polyethylene / polypropylene or the like can be used as the material. The fiber basis weight is preferably 5 to 40 g / m ² , especially 10 to 30 g / m ² .

(Three-dimensional gather)
The three-dimensional gather 30 is formed of a gather sheet 31 that is substantially continuous in the width direction and an elongated elastic elastic member 32 that is fixed to the gather sheet 31 in an elongated state along the front-rear direction. A water-repellent non-woven fabric can be used as the gather sheet 31, and a rubber thread or the like can be used as the elastic elastic member 32. The number of elastic elastic members 32 is not particularly limited, but it is preferable to provide a plurality of elastic elastic members 32 as shown in FIG.

The facing surface of the gather sheet 31 facing the top sheet 10 or the like has a fixing start end in the width direction on the side portion of the top sheet 10, and the portion outside the fixing start end in the width direction is the back sheet 11 and the exterior sheet 12. It is fixed to the side of the surface with a hot melt adhesive or the like.

The inside of the three-dimensional gather 30 in the width direction from the fixed start end is fixed on the top sheet 10 at both ends in the front-rear direction of the product, but the part between both ends in the front-rear direction is a non-fixed free part, and this free part is It comes to stand up by the contraction force of the elastic elastic member 32. At the time of wearing the disposable diaper 100, the disposable diaper 100 is mounted in a boat shape according to the wearer's body shape, and a contraction force acts on the elastic elastic member 32, so that the three-dimensional gather 30 stands up toward the wearer and the wearer Adhere around the legs. As a result, so-called lateral leakage from around the legs is prevented.

(Plane gather)
A flat gather 40 is formed on the outside of the base portion of the three-dimensional gather 30 in the side flap portion SF. An elastic elastic member 41 around the leg made of rubber thread or the like is fixed to the side flap portion SF in a state of being extended in the front-rear direction between the gather sheet 31 and the back sheet 11 on the outside of the base of the three-dimensional gather 30. As a result, flat gathers 40 are formed around the legs of the side flap portion SF.

(Fastening tape)
As shown in FIGS. 1 and 2, the fastening tape 50 is formed of a base material 51 fixed to the rear portion of the side flap SF and a locking portion 52 provided on the inner surface of the base material 51.

The base portion of the base material 51 is fixed between the gather sheet 31 and the exterior sheet 12 with a hot melt adhesive or the like. The base material 51 is made of a non-woven fabric, a plastic film, a polylami non-woven fabric, paper, or a composite material thereof.

The locking portion 52 is formed of a hook material of a mechanical fastener. 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 50.

When the exterior sheet 12 is made of a non-woven fabric, the locking portion 52 of the fastening tape 50 can be directly locked to the outer surface of the exterior sheet 12, but as shown in FIG. 2, the ventral side of the exterior sheet 12 It is preferable to provide a target sheet 55 to which the locking portion 52 of the fastening tape 50 is locked. As a result, the locking portion 52 of the fastening tape 50 can be easily locked to the target sheet 55, and the disposable diaper 100 can be easily attached to the wearer. The target sheet 55 is preferably formed of a plastic film, a non-woven fabric, or the like on which a large number of loop threads are provided on the surface.

<Disposable diaper of the first embodiment>
Next, the disposable diaper 100 of the first embodiment of the present invention shown in FIG. 4 will be described. FIG. 4A is a plan view of the outer surface of the back sheet 12, FIG. 4B is a plan view of the outer surface of the exterior sheet 12, and FIG. 4C shows the exterior sheet 12 fixed to the outer surface of the back sheet 12. It is an outer surface plan view in a state.

As shown in FIG. 4A, on the outer surface of the back sheet 11, a first design portion 60A such as a floral pattern is provided at each apex of the grid pattern. The first design portion 60A is formed of a dark color, for example, black, dark blue, dark brown, charcoal gray, or the like. As a result, the first design portion 60A can be easily visually recognized from the outside of the disposable diaper 100, that is, from the outside of the exterior sheet 12, and the appearance of the disposable diaper 100 can be enhanced.

As shown in FIG. 4B, the exterior sheet 12 is provided with non-openings 65 at the respective vertices in a grid pattern, and openings 66 are provided in the front-rear direction and the width direction around the non-openings 65. It is provided at a predetermined interval. As a result, the air permeability of the exterior sheet 12 can be improved and the occurrence of stuffiness inside the disposable diaper 100 can be significantly reduced. In FIG. 4B, the non-opening portion 65 is shown in a substantially elliptical shape in order to easily understand the non-opening portion 65, but in the present specification, the “non-opening portion” is the exterior. A portion of the sheet 12 where the opening 66 is not provided.

As shown in FIG. 4C, in a state where the exterior sheet 12 is fixed to the outer surface of the back sheet 11, the first design portion 60A of the back sheet 11 is located at the non-opening portion 65 of the exterior sheet 12. That is, the first design portion 60A of the back sheet 11 is not formed at the portion of the back sheet 11 facing the opening 66 of the exterior sheet 12. As a result, the first design portion 60A of the back sheet 11 is completely covered by the non-opening 65 of the exterior sheet 12, and the first design portion 60A of the back sheet 11 can be visually recognized from the outside of the disposable diaper 100 through the exterior sheet 12. The brightness L ^* and the saturation C ^* are maintained at the same value, and the appearance of the disposable diaper 100 can be enhanced without giving a sense of discomfort to the wearer or the like.

On the other hand, when a part of the first design portion 60A of the back sheet 11 is located in the opening 66 of the exterior sheet 12, the back covered by the non-opening 65 of the exterior sheet 12 as shown in FIG. The brightness L ^* and saturation C ^* of the first design portion 60A of the back sheet 11 which is not covered by the first design portion 60A of the seat 11 and the non-opening 65 of the exterior sheet 12 are different, which makes the wearer feel uncomfortable. Giving it reduces the appearance of the disposable diaper 100.

In FIG. 9, the first design portion 60A of the back sheet 11 is formed in dark blue with a lightness L ^* of 20 and a saturation C ^* of 30, and the second design portion 60B described later is formed in light blue with a lightness L ^* of 90. Then, the non-opening portion 65 of the exterior sheet 12 (the non-opening portion 65 shown in the substantially elliptical shape of FIG. 4B) is formed to have a front-rear dimension of 40 mm and a width direction dimension of 50 mm, and the opening 66. The diameter is 1 mm, the distance in the front-rear direction is 3 mm, and the distance in the width direction is 7 mm. The diameter of the opening 66 of the exterior sheet 12 may be 0.1 to 2 mm, the distance in the front-rear direction may be 1 to 5 mm, and the distance in the width direction may be 5 to 10 mm.

Next, a method of fixing the back sheet 11 and the exterior sheet 12 so that the first design portion 60A of the back sheet 11 is located in the non-opening 65 of the exterior sheet 12 will be described.

The front-rear direction of FIG. 8 corresponds to the MD direction of the production line of the disposable diaper 100, and the width direction of FIG. 8 corresponds to the CD direction of the production line of the disposable diaper 100. The moving speed of the back sheet 11 in the MD direction is driven by the first front-rear motor (not shown), and the center position of the back sheet 11 in the CD direction is driven by the first width motor (not shown). The moving speed of the exterior sheet 12 in the MD direction is driven by a second front-rear motor (not shown), and the center position of the back sheet 11 in the CD direction is driven by a second width motor (not shown).

As shown in FIG. 8A, when the first design portion 60A of the back sheet 11 is displaced to the rear side facing the opening 66 of the exterior sheet 12, first, an image inspection device (not shown) is used. The amount of misalignment of the first design portion 60A of the back sheet 11 is detected. Next, the rotation speed of the first front-rear motor is increased according to the detection value input from the image inspection device to the control device (not shown) to increase the moving speed of the back sheet 11 in the MD direction. As a result, as shown in FIG. 8B, the first design portion 60A of the back sheet 11 can be positioned at a portion facing the non-opening portion 65 of the exterior sheet 12.

When the first design portion 60A of the back sheet 11 is displaced to the right side facing the opening 66 of the exterior sheet 12, first, the position of the first design portion 60A of the back sheet 11 is determined by an image inspection device (not shown). The amount of deviation is detected. Next, the back sheet 11 is moved to the left by changing the rotation angle of the first width motor according to the detected value input from the image inspection device to the control device (not shown). As a result, as shown in FIG. 8B, the first design portion 60A of the back sheet 11 can be positioned at a portion facing the non-opening portion 65 of the exterior sheet 12. The disposable diaper 100 whose position shift to the rear side of the opening 66 of the exterior sheet 12 of the first design portion 60A of the back sheet 11 is detected by the image inspection device is transferred to the visual inspection process and visually inspected by the inspector. The inspection is done. Further, when the image inspection device detects the positional deviation of the exterior sheet 12 of the first design portion 60A of the back sheet 11 to the rear side of the opening 66 or the like more than a predetermined frequency, the production line is suspended. Replace deteriorated parts such as belts.

<Disposable diaper of the second embodiment>
Next, the disposable diaper 100 of the second embodiment of the present invention shown in FIG. 5 will be described. The same parts and the like as in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 5 (a), on the outer surface of the back sheet 11, first design portions 60A such as floral patterns are provided at the vertices of the grid pattern, and dot lines and the like are spaced apart from each other in the width direction. The second design part 60B of the above is provided. The first design portion 60A is formed of a dark color such as black, dark blue, dark brown, charcoal gray or the like, and the second design portion 60B is formed of a light color such as yellow, pink or light blue. As a result, the first design portion 60A and the second design portion 60B can be visually recognized from the outside of the disposable diaper 100, that is, from the outside of the exterior sheet 12, and the appearance of the disposable diaper 100 can be enhanced.

As shown in FIG. 5B, the exterior sheet 12 is provided with non-openings 65 at the respective vertices in a grid pattern, and openings 66 are provided in the front-rear direction and the width direction around the non-openings 65. It is provided at a predetermined interval. As a result, the air permeability of the exterior sheet 12 can be improved and the occurrence of stuffiness inside the disposable diaper 100 can be significantly reduced.

As shown in FIG. 5C, in a state where the exterior sheet 12 is fixed to the outer surface of the back sheet 11, the first design portion 60A of the back sheet 11 is located at the non-opening portion 65 of the exterior sheet 12, and the back sheet A part of the second design portion 60B of 11 is located in the opening 66 of the exterior sheet 12. As a result, the first design portion 60A of the back sheet 11 is completely covered by the non-opening 65 of the exterior sheet 12, and the first design portion 60A of the back sheet 11 can be visually recognized from the outside of the disposable diaper 100 through the exterior sheet 12. The brightness L ^* and the saturation C ^* are maintained at the same value, and the appearance of the disposable diaper 100 can be enhanced without giving a sense of discomfort to the wearer or the like. Further, since the second design portion 60B of the back sheet 11 is light in color, it is located at the second design portion 60B covered by the non-opening portion 65 of the exterior sheet 12 and the opening 66 of the exterior sheet 12, and is provided by the non-opening portion 65. Since the difference in the value of the brightness L ^* of the second design portion 60B that is not covered is small, the appearance of the disposable diaper 100 is not deteriorated without giving a sense of discomfort to the wearer or the like.

<Disposable diaper of the third embodiment>
Next, the disposable diaper 100 of the third embodiment of the present invention shown in FIG. 6 will be described. The same members and the like as in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 6A, a first design portion 60A such as a floral pattern is provided on the outer surface of the back sheet 11 at a predetermined interval in the width direction. The first design portion 60A is formed of a dark color, for example, black, dark blue, dark brown, charcoal gray, or the like. As a result, the first design portion 60A can be easily visually recognized from the outside of the disposable diaper 100, that is, from the outside of the exterior sheet 12, and the appearance of the disposable diaper 100 can be enhanced.

As shown in FIG. 6B, the exterior sheet 12 is provided with non-openings 65 at predetermined intervals in the width direction, and is between the non-openings 65 and the adjacent non-openings 65 in the width direction. Is provided with openings 66 in the front-rear direction at predetermined intervals. As a result, the air permeability of the exterior sheet 12 can be improved and the occurrence of stuffiness inside the disposable diaper 100 can be significantly reduced.

As shown in FIG. 6C, in a state where the exterior sheet 12 is fixed to the outer surface of the back sheet 11, the first design portion 60A of the back sheet 11 is not on both sides of the opening 66 of the exterior sheet 12 in the width direction. It is located at the opening 65 and the non-opening 65 between the opening 66 and the adjacent opening 66. As a result, the first design portion 60A of the back sheet 11 is completely covered by the non-opening 65 of the exterior sheet 12, and the first design portion 60A of the back sheet 11 can be visually recognized from the outside of the disposable diaper 100 through the exterior sheet 12. The brightness L ^* and the saturation C ^* are maintained at the same value, and the appearance of the disposable diaper 100 can be enhanced without giving a sense of discomfort to the wearer or the like. Further, unlike the disposable diaper 100 of the first embodiment, the positional deviation of the first design portion 60A of the back sheet 11 in the width direction may be controlled, and the disposable diaper 100 of the first embodiment can be manufactured more easily. ..

<Disposable diaper of the fourth embodiment>
Next, the disposable diaper 100 of the fourth embodiment of the present invention shown in FIG. 7 will be described. The same members and the like as in the third embodiment are designated by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 7A, a first design portion 60A such as a floral pattern is provided on the outer surface of the back sheet 11 at a predetermined interval in the width direction, and is adjacent to the first design portion 60A in the width direction. A second design unit 60B such as a dot line is provided between the first design unit 60A. The first design portion 60A is formed of a dark color such as black, dark blue, dark brown, charcoal gray or the like, and the second design portion 60B is formed of a light color such as yellow, pink or light blue. As a result, the first design portion 60A and the second design portion 60B can be visually recognized from the outside of the disposable diaper 100, that is, from the outside of the exterior sheet 12, and the appearance of the disposable diaper 100 can be enhanced.

As shown in FIG. 7B, the exterior sheet 12 is provided with non-openings 65 at predetermined intervals in the width direction, and is between the non-openings 65 and the adjacent non-openings 65 in the width direction. Is provided with openings 66 in the front-rear direction at predetermined intervals. As a result, the air permeability of the exterior sheet 12 can be improved and the occurrence of stuffiness inside the disposable diaper 100 can be significantly reduced.

As shown in FIG. 7C, in a state where the exterior sheet 12 is fixed to the outer surface of the back sheet 11, the first design portion 60A of the back sheet 11 is located at the non-opening portion 65 of the exterior sheet 12, and the back sheet A part of the second design portion 60B of 11 is located in the opening 66 of the exterior sheet 12. As a result, the first design portion 60A of the back sheet 11 is completely covered by the non-opening 65 of the exterior sheet 12, and the first design portion 60A of the back sheet 11 can be visually recognized from the outside of the disposable diaper 100 through the exterior sheet 12. The brightness L ^* and the saturation C ^* are maintained at the same value, and the appearance of the disposable diaper 100 can be enhanced without giving a sense of discomfort to the wearer or the like. Further, since the second design portion 60B of the back sheet 11 is light in color, it is located at the second design portion 60B covered by the non-opening portion 65 of the exterior sheet 12 and the opening 66 of the exterior sheet 12, and is provided by the non-opening portion 65. Since the difference in the value of the brightness L ^* of the second design portion 60B that is not covered is small, the appearance of the disposable diaper 100 is not deteriorated without giving a sense of discomfort to the wearer or the like.

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

・ "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. It is not necessary to pre-dry the fibers having an official moisture content of 0.0%. A sample having a size of 200 mm × 250 mm (± 2 mm) is cut out from the test piece in a constant weight state using a paper density plate (200 mm × 250 mm, ± 2 mm). Weigh the sample and 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 .

-"Water absorption" is measured by JIS K7223-1996 "Water absorption test method for superabsorbent polymer".

-"Water absorption rate" is the "time to the end point" when JIS K7224-1996 "Water absorption rate test method for superabsorbent polymer" was performed using 2 g of super absorbent polymer and 50 g of physiological saline. And.

-The "MD direction" and "CD direction" mean the flow direction (MD direction) in the manufacturing facility and the lateral direction (CD direction) orthogonal to the flow direction, one of which is the front-rear direction and the other. Is in the width direction. The MD direction of the non-woven fabric is the direction of fiber orientation of the non-woven fabric. The fiber orientation is the direction along which the fibers of the non-woven fabric follow. For example, the measurement method according to the fiber orientation test method based on the zero-distance tensile strength of the TAPPI standard method T481 or the fibers based on the tensile strength ratio in the anteroposterior direction and the width direction. It can be discriminated by a simple measuring method for determining the orientation direction.

-The "light transmittance" is measured as follows using an illumination metering type color difference meter Z-300A (manufactured by Nippon Denshoku Industries Co., Ltd.).
First, measurement is performed in a state where a shield that blocks light is arranged between one detection unit and the other detection unit, and zero point correction is performed. Next, after removing the shield arranged between one detection unit and the other detection unit, measurement is performed in a state where there is nothing blocking the light, and standard correction is performed. Next, the exterior sheet, which is an object, is measured in a state of being arranged between one detection unit and the other detection unit.

The present invention can be used for disposable diapers 100.

10 Top sheet 11 Back sheet 12 Exterior sheet 21 Absorber 60A 1st design part 60B 2nd design part 65 Non-opening 66 Opening 100 Disposable diaper

Claims (4)

A liquid-permeable top sheet provided on the body side, a liquid-impermeable back sheet provided on the anti-body side, and an absorber provided between the top sheet and the back sheet for absorbing excrement. , In a disposable diaper provided with an exterior sheet provided on the opposite side of the back sheet,
The outer surface of the backsheet, L ^* a ^* b ^* in the color system of the lightness L ^* of 30 or less, the chroma ^{C * (a 2 + b 2} ) a chroma C ^* of 60 or less which is calculated by ^1/2 A first design part formed by a dark color and a second design part formed by a light color having a brightness L ^* of 50 or more are provided.
The exterior sheet is provided with a non-opening and an opening at predetermined intervals in the front-rear direction and the width direction.
A disposable diaper characterized in that the entire first design portion is positioned in the non-opening portion and the second design portion is located in the non-opening portion and the opening portion in an outer plan view. The disposable diaper according to claim 1, wherein the openings are provided at predetermined intervals in the front-rear direction and the width direction. The disposable diaper according to claim 1 or 2, wherein the weight of the exterior sheet is 10 to 50 g / m ² . The disposable diaper according to any one of claims 1 to 3, wherein the exterior sheet has a light transmittance of 60 to 90%.