JP3245097U - absorbent articles - Google Patents

Abstract

An object of the present invention is to provide an absorbent article through which menstrual blood or the like is difficult to see through when disposed of. An absorbent article includes an absorbent body 4, a top sheet 2, a back sheet 3, and a colored sheet 15 having a colored portion. The absorbent article has a width direction and a front-back direction that are orthogonal to each other. The absorbent body has a first surface 4a and a second surface 4b. The top sheet is arranged on the first surface side of the absorber. The back sheet is arranged on the second surface side of the absorbent body. The colored sheet is arranged between the absorbent body and the back sheet. The colored portion is configured to be visible through the back sheet. The liquid diffusivity of the colored sheet is lower than the liquid diffusivity of the second surface of the absorber. [Selection diagram] Figure 2

Description

The present invention relates to absorbent articles such as sanitary napkins.

Generally, when disposing of a used sanitary napkin, the sanitary napkin is rolled up with the top sheet side that has absorbed menstrual blood etc. inside, and then wrapped in toilet paper or an individual packaging sheet.
Patent Document 1 discloses that in an absorbent article that absorbs urine and body fluids, a body fluid permeable sheet having a surface printed with a color or a pattern using hydrophobic ink is arranged between a front sheet and an absorbent core. This is disclosed. In such an absorbent article, by using a body fluid permeable sheet printed with a color or a pattern, it is possible to improve the concealability of the portion wet with urine or body fluid after use.

Japanese Patent Application Publication No. 2007-130504

When used sanitary napkins are disposed of, menstrual blood is dark in color, so menstrual blood can be seen through the back sheet, causing discomfort to the wearer and others.
With the configuration of Patent Document 1 mentioned above, it is possible to obtain the effect of concealing body fluids from the top sheet side, but when disposing of an absorbent article by rolling it up so that the back sheet side faces outward, it is possible to obtain the effect of concealing body fluids from the top sheet side. The blood is clearly visible.

An object of the present invention is to provide an absorbent article through which menstrual blood and the like are difficult to see through when disposed of.

An absorbent article according to one embodiment of the present invention includes an absorbent core, a topsheet, a backsheet, a colored sheet including a colored portion, first left and right compression grooves, and second left and right compression grooves. .
The absorbent article has a width direction and a front-back direction that are orthogonal to each other.
The absorbent article has an excretion part facing region, and a front region and a rear region located in the front-rear direction with the excretion part facing region interposed therebetween.
The absorbent body has a first surface and a second surface.
The topsheet is arranged on the first surface side of the absorber.
The back sheet is arranged on the second surface side of the absorbent body.
The colored sheet is arranged between the absorbent body and the back sheet.
The first left and right compression grooves are provided on the first surface, integrate the topsheet and the absorbent core, extend in the front-rear direction, and are located as a pair of left and right in the width direction.
The second left and right compression grooves are recesses that are provided on the second surface and overlap the first left and right compression grooves in plan view.
The colored sheet has a low L ^* value area as a colored part, and a band-shaped high L that is located on both sides of the width direction outward from the low L ^* value area and has a higher L ^* value than the low L ^* value area. ^* Value area.
The colored portion is configured to be visible through the back sheet.
The liquid diffusivity of the colored sheet is lower than the liquid diffusivity of the second surface of the absorber.
The first left and right compressed grooves and the second left and right compressed grooves have a higher density of fibers constituting the absorbent body than the surrounding areas.
In the excretion part facing region, the first left and right compression grooves and the second left and right compression grooves and the low L ^* value region overlap in plan view.
The high L ^* value region is disposed further outward in the width direction than the first left and right compressed grooves and the second left and right compressed grooves.
The colored sheet is not joined to the absorbent body in the region where the second left and right compression grooves are located.

As described above, according to the absorbent article of the present invention, it is possible to make menstrual blood etc. difficult to see through from the back sheet side.

FIG. 1 is a plan view showing an absorbent article according to an embodiment of the present invention. 2 is an enlarged sectional view showing a cross section taken along line II-II in FIG. 1. FIG. It is a top view explaining the positional relationship between the colored part and the compression groove in the said absorbent article. It is a top view of the colored sheet which constitutes a part of the above-mentioned absorbent article. It is a plan view when the above-mentioned absorbent article is viewed from the back side, (A) shows the state before use, (B) shows the state after use in which menstrual blood has spread within the region of the colored part, (C) shows the state after use in which menstrual blood has spread beyond the colored area. It is a top view of a colored sheet for explaining a modification of a colored part.

Embodiments of the present invention will be described below with reference to the drawings.
[Overall composition of napkin]
As shown in FIG. 1, the absorbent article 1 of the present invention includes a main body M, a pair of wing parts W, and left and right compression grooves 6. The absorbent article 1 is configured as a sanitary napkin, and is hereinafter referred to as the napkin 1.
The napkin 1 has a vertical direction X that corresponds to the front-back direction of the wearer and a horizontal direction Y that corresponds to the left-right direction of the wearer and is orthogonal to the vertical direction X. The horizontal direction of the napkin 1 corresponds to the width direction of the napkin 1. Furthermore, the napkin 1 has a thickness direction Z that is orthogonal to both the longitudinal direction X and the lateral direction Y. In this specification, with respect to the thickness direction Z, the side closer to the wearer's skin when worn is sometimes referred to as the upper or skin side, and the side closer to clothing is sometimes referred to as the lower or non-skin side.

The main body M extends along the longitudinal direction X and is fixed to the inner surface of the wearer's clothing when worn. The main body M has an absorbent body 4, which will be described later, and has a function of absorbing liquid substances (hereinafter also referred to as "liquid") such as menstrual blood of the wearer.

The main body M is divided along the longitudinal direction X into a front region M1, an intermediate region (vertical intermediate region) M2, and a rear region M3.
The intermediate region M2 is a region facing the wearer's excretory region when worn. In FIG. 1, the intermediate region M2 is the region between the front and rear base end portions of the wing portions W in the main body M.
The front region M1 is a region located in front of the intermediate region M2 (on the ventral side of the wearer), and is configured to face the front of the wearer's excretory region when worn.
The rear region M3 is a region located behind the intermediate region M2 (on the back side of the wearer), and is configured to face the rear of the wearer's excretory region when worn.
Note that when worn here, it means a state in which the normal proper wearing position (the expected wearing position of napkin 1) is maintained, and does not include cases where napkin 1 is shifted from the wearing position. .
In addition, when the absorbent article does not have a wing part, the main body M is divided into three equal parts along the longitudinal direction M1, the area arranged at the rear is referred to as a rear part M3.

The wing portion W is configured to largely protrude outward in the lateral direction Y from the intermediate region M2 of the main body M.

As shown in FIG. 2, the napkin 1 includes an absorbent core 4, a top sheet 2, a back sheet 3, a pair of side sheets 5, and a colored sheet 15. In the main body M, the napkin 1 has a structure in which a back sheet 3, an absorbent core 4, and a top sheet 2 are laminated in the thickness direction Z. These structures are appropriately joined and integrated, for example, by joining with an adhesive, heat sealing, etc., and by embossing with the left and right compressed grooves 6.

[Components of each part]
(Absorber)
The absorbent body 4 extends along the longitudinal direction X and is disposed between the top sheet 2 and the back sheet 3. The absorber 4 absorbs liquid from the surface on the top sheet 2 side, diffuses it inside, and retains the liquid.
The absorbent core 4 has a first surface (skin side) 4a located on the top sheet 2 side and a second surface (non-skin side) 4b located on the back sheet 3 side.
The absorbent body 4 has an absorbent core 7 and a core wrap sheet 8.
In the example shown in FIG. 2, the absorbent core 7 has a structure in which the superabsorbent polymer P is held in a fiber aggregate made of hydrophilic fibers such as pulp fibers, but the absorbent core 7 is not limited to this structure. .
The core wrap sheet 8 has a function of covering the absorbent core 7 and, for example, maintaining the shape of the absorbent core 7. The core wrap sheet 8 is typically a sheet-like material such as nonwoven fabric or paper mainly composed of hydrophilic fibers. The hydrophilic fibers contained in the core wrap sheet 8 include wood pulps such as softwood pulp and hardwood pulp, natural fibers such as non-wood pulps such as cotton pulp and hemp pulp; modified pulps such as cationized pulp and mercerized pulp; Regenerated fibers such as cupro and rayon; semi-synthetic fibers such as acetate; hydrophilic synthetic fibers such as polyvinyl alcohol fibers and polyacrylonitrile fibers; hydrophilic treatment of synthetic fibers such as polyethylene terephthalate fibers, polyethylene fibers, polypropylene fibers, and polyester fibers. These fibers can be used alone or in combination of two or more. Typical hydrophilic fibers in the core wrap sheet are natural fibers, regenerated cellulose fibers, or semi-synthetic fibers.

The core wrap sheet 8 has a rectangular shape, for example, and is arranged so that when covering the absorbent core 7, a pair of opposing ends overlap each other and are located on the back sheet 3 side. Ru. A multilayer portion 81 in which two core wrap sheets 8 overlap on the back sheet 3 side extends in the vertical direction X and is located near the center of the absorbent body 4 in the horizontal direction Y.
The core wrap sheet 8 constitutes a first surface 4a and a second surface 4b of the absorbent core 4. The second surface 4b has a multilayer section 81.

As shown in FIG. 2, for example, the absorbent core 7 has a protrusion 18 located at the center in the lateral direction Y and protrudes upward in the thickness direction Z in the intermediate region M2. The protruding portion 18 has a higher basis weight as a whole and is thicker than other regions of the absorbent core 7, thereby increasing the absorbency in the intermediate region M2. Further, by providing the protrusion 18 facing the wearer's excretion area, it is possible to improve the fit to the wearer's excretion area.
Further, the absorbent core 7 may have a low basis weight groove portion 19 extending in at least one of the vertical direction X or the horizontal direction Y. The low basis weight groove part 19 is configured with a basis weight lower than the surrounding area, and as shown in FIG. including a material part. The absorbent core 7 is divided into blocks by providing the low basis weight grooves 19 in, for example, a grid pattern.
Since the absorbent core 7 has the low basis weight groove portion 19, flexibility can be imparted to the absorbent core 7. Furthermore, by configuring the low basis weight groove portion 19 to be thinner than the surrounding area, vapor derived from the liquid is easily released along the groove, and the breathability of the absorbent core 7 can be improved.

(Top sheet)
The topsheet 2 is configured as a liquid-permeable sheet material, and is arranged above the absorber 4 in the thickness direction Z. In addition, between the top sheet 2 and the absorbent body 4, there is a material that improves the permeability of liquid from the top sheet 2 to the absorbent body 4, prevents the liquid absorbed by the absorbent body 4 from returning to the top sheet 2, etc. From this point of view, a second sheet (sublayer sheet) may be arranged. The topsheet 2 has, for example, a plurality of protrusions that protrude outward in the thickness direction Z.

(back sheet)
The back sheet 3 is placed below the absorber 4 in the thickness direction Z with the colored sheet 15 interposed therebetween. The back sheet 3 is joined to the top sheet 2 and side sheets 5 by adhesive, heat sealing, or the like, for example, at its periphery.
The back sheet 3 is formed of a sheet material having functions such as low liquid permeability, water vapor permeability, and water repellency, for example. As the sheet material, for example, a thermoplastic resin film, a laminate of the film and a nonwoven fabric, or the like can be used.
The back sheet 3 is configured so that when the napkin 1 is viewed from the back sheet 3 side, a low L ^* value region 16 of a colored portion of a colored sheet 15, which will be described later, is transparent and visible.
Although not shown, the back sheet 3 is provided with an adhesive portion for fixing the main body M and the wing portions W to clothing.

(side seat)
The pair of side sheets 5 are arranged on the outer side of the top sheet 2 in the lateral direction Y. The material for the side sheet 5 is preferably a sheet material that is less hydrophilic than the top sheet 2, and specifically, nonwoven fabrics, film materials, and laminate structures of nonwoven fabric and film materials that are less hydrophilic than the top sheet 2 are preferred. Examples include sheets. The side sheet 5 is bonded to the top sheet 2 using adhesive E, for example.

(Left and right compression grooves)
As shown in FIGS. 1 and 2, first left and right compression grooves 6a are formed on the surface sheet 2 side of the main body M, and first left and right compression grooves 6a and a flat surface are formed on the second surface 4b side of the absorbent body 4. Second left and right compression grooves 6b, which are concave portions that overlap in view, are formed. When there is no particular need to distinguish between the first left and right compressed grooves 6a and the second left and right compressed grooves 6b, they are referred to as left and right compressed grooves 6.
The left and right compression grooves 6 are a pair of compression grooves formed on the periphery of the main body M. The left and right compressed grooves 6 are formed by compressing the main body M from the top sheet 2 side in the thickness direction Z.
As shown in FIG. 2, the first left and right compression grooves 6a have a structure in which the top sheet 2 and the absorbent body 4 are integrally recessed toward the back sheet 3 side. The second left and right compression grooves 6b and the absorbent body 4 are integrally recessed toward the top sheet 2 side. The left and right compressed grooves 6 can be formed according to a conventional method by compressing with or without heat or embossing such as ultrasonic embossing. In the left and right compression grooves 6, the topsheet 2 and the absorbent core 4 are integrated by heat fusion or the like.

With such a configuration, the left and right compressed grooves 6 have higher rigidity than other regions and become portions that are less likely to deform. Therefore, when the napkin 1 receives an external force, the left and right compression grooves 6 can function as a deformation origin that promotes deformation of the surrounding low-rigidity region, or as a portion that exerts a resistance against the external force.
Furthermore, since the left and right compression grooves 6 have a higher density of fibers than the surrounding areas, they can absorb and retain the liquid excreted by capillary action. As a result, the left and right compression grooves 6 also have a leak-proofing effect that prevents liquid from leaking to the outside of the absorber 4.

As shown in FIG. 1, the left and right compression grooves 6 are arranged in pairs in the lateral direction Y on the left and right sides. The left and right compression grooves 6 shown in FIGS. 1 and 3 are configured line-symmetrically with respect to a center line that bisects the main body M in the horizontal direction Y, and are configured to go around the main body M as a whole.
Moreover, the napkin 1 may have an intermediate pressing groove 11 extending in the lateral direction Y in addition to the left and right pressing grooves 6.

The left and right compressed grooves 6 have round grooves 12 configured as circumferential grooves. The round groove portions 12 extend in the vertical direction Extends to.
The round groove portion 12 includes constricted portions that are narrowed inward in the lateral direction Y, near the boundary between the front region M1 and the intermediate region M2, and near the boundary between the intermediate region M2 and the rear region M3. Further, the round groove portion 12 has a configuration in which a region between the front and rear constricted portions bulges in the lateral direction Y.
As shown in FIG. 3, the maximum dimension D2 in the lateral direction Y between the left and right grooves constituting the round groove portion 12 in the intermediate region M2, which is the region facing the excretion part, is the maximum dimension D1 in the front region M1 and the maximum dimension D1 in the rear region M3. It is larger than dimension D3.

(colored sheet)
The colored sheet 15 is disposed between the absorbent body 4 and the backsheet 3, and prevents menstrual blood etc. absorbed by the absorbent body 4 from reaching and adhering to the skin side of the backsheet 3.

As shown in FIG. 4, the colored sheet 15 has a low L ^* value region 16 in the colored portion and a low L ^* value region 16 located on both sides of the low L ^* value region 16 in the lateral direction Y outward ^. It has a high L ^* value region 17 with a high value. Note that the colored sheet 15 does not need to be colored over the entire area, but only needs to have a colored portion. For example, the high L ^* value region 17 may be white, that is, a non-colored portion.
Here, "colored" means excluding not only colorless and transparent colors but also colors with an L ^* value of 95 or more (white). In this specification, the L ^* value, a ^* value, and b ^* value in the CIE-L ^* a ^* b ^* color system can be measured using a color difference system. For example, it can be determined by measuring the reflected light of the sheet using a handy spectroscopic color difference system NF333 (trade name) manufactured by Nippon Denshoku Industries Co., Ltd. under the measurement conditions of light source C and viewing angle of 2 degrees. At this time, it is preferable to perform the measurement using a white plate having an L ^* value of 95 or more as a background plate.
Note that the L ^* value indicates brightness. The a ^* value and b ^* value indicate the direction of color. a ^* indicates a substantially red direction, -a ^* indicates a substantially green direction, b ^* indicates a substantially yellow direction, and -b ^* indicates a substantially blue direction. Colors in which the a ^* value and b ^* value in the CIE-L ^* a ^* b ^* color system approach 0 are intermediate colors such as white, gray, and black.

The colored sheet 15 may contain a deodorant or an antibacterial agent.
The deodorant is, for example, activated carbon. In this embodiment, by using activated carbon, at least a portion of the colored sheet 15 is colored, here a dark gray color, which provides a deodorizing effect and reduces the visibility of menstrual blood.

In this embodiment, as shown in FIG. 4, the colored sheet 15 is a laminate of an activated carbon-containing sheet 9 and two covering sheets 10 that cover the front and back surfaces of the activated carbon-containing sheet 9. In this embodiment, the covering sheets 10 have the same shape and the same size, and the colored sheets 15 are joined to each other at both ends in the lateral direction Y without using the activated carbon-containing sheet 9. It has a striped area.
This band-shaped region constitutes a high L ^* value region 17. The covering sheet 10 is, for example, white, and the high L ^* value region 17 as a non-colored portion where two covering sheets 10 overlap has a white color.
The area where the two covering sheets 10 and the activated carbon-containing sheet 9 overlap is dark gray (colored) and constitutes a low L ^* value area 16 as a colored area.

The activated carbon-containing sheet 9 is mainly composed of activated carbon and fiber raw material.
The effect of a deodorant can be obtained by using activated carbon that exhibits high adsorption properties for gaseous substances. The content of activated carbon in the activated carbon-containing sheet 9 is preferably 1 to 50% by weight, more preferably 3 to 30% by weight.
As the fiber raw material, known natural fibers such as wood pulp such as NBKP and LBKP, and non-wood pulp such as straw and cotton can be used. Further, for the purpose of improving sheet strength, rigid fibers such as polyethylene fibers may be used in combination. The content of the fiber raw material in the activated carbon-containing sheet 9 is preferably 50% by mass or more and 99% by mass or less, more preferably 70% by mass or more and 97% by mass or less.

As the covering sheet 10, a sheet material made of fiber raw material, such as paper, nonwoven fabric, etc., is used. As the fiber raw material in the case of paper, the same material as the activated carbon-containing sheet 9 can be used. Further, as the nonwoven fabric, for example, known nonwoven fabrics such as spunlace nonwoven fabric and spunbond nonwoven fabric can be used.
The activated carbon-containing sheet 9 and both covering sheets 10 can be laminated and integrated, for example, by laminating them together or pasting them together using an adhesive or the like. By covering the activated carbon-containing sheet 9 with the covering sheet 10, the activated carbon is prevented from falling off.

(Liquid diffusivity of colored sheet)
The liquid diffusivity of the colored sheet 15 is lower than that of the core wrap sheet 8 forming the second surface 4b of the absorbent body 4.

The liquid diffusivity of the colored sheet 15 and the core wrap sheet 8 can be evaluated as follows.
A rectangular colored sheet and core wrap sheet with a width of 60 mm and a length of 200 mm are prepared as evaluation objects. For the colored sheets and core wrap sheets to be evaluated, 0.5 g of colored physiological saline or 0.5 g of simulated menstrual blood was applied to the central part of each in the width direction and length direction in an oval shape from the skin-facing side. Inject all at once using a syringe. Two minutes after the injection, the area of the colored region produced by the injection of physiological saline or simulated menstrual blood on each of the colored sheet and core wrap sheet was measured, and the area was defined as the liquid diffusion area. The area of the colored region, that is, the liquid diffusion area, was measured by copying each of the colored sheet and core wrap sheet onto an OHP sheet and using image analysis software ImageProPlus.
In both the case of using colored physiological saline and the case of using simulated menstrual blood, it is sufficient that the liquid diffusivity in the colored sheet 15 is equal to or lower than the liquid diffusivity in the second surface 4b of the absorber 4.
The simulated menstrual blood had a viscosity of 8 mPa·s as measured using a B-type viscometer (manufactured by Toki Sangyo Co., Ltd., model number TVB-10M, measurement conditions: rotor No. 19, 30 rpm, 25°C, 60 seconds). The blood cell/plasma ratio of defibrinated horse blood (manufactured by Nippon Biotest Co., Ltd.) was prepared so that
In addition, in the napkin 1 of this embodiment, the dripping location of the physiological saline or simulated menstrual blood is a colored part (low L ^* value region 16) located at the center part in the width direction and length direction of the colored sheet 15. Therefore, the measured liquid diffusivity is mainly that of the colored portion (low L ^* value region 16).

In order to make the liquid diffusivity of the colored sheet 15 equal to or lower than the liquid diffusivity on the second surface 4b of the absorber 4, for example, the basis weight of the colored sheet 15 can be adjusted by adjusting the basis weight of the colored sheet 15 to a core wrap sheet made of paper constituting the second surface 4b. This can be achieved by setting the basis weight to 8 or more.
The basis weight of the colored sheet 15 is preferably 10 g/m ² or more and 100 g/m ² or less, more preferably 20 g/m ² or more and 80 g/m ^{2 or} less.
The basis weight of the core wrap sheet 8 constituting the second surface 4b of the absorbent core 4 is preferably 8 g/m ² or more and 30 g/m ² or less, more preferably 10 g/m ² or more and 20 g/m ² or less. In addition, the basis weight of the core wrap sheet 8 here is the basis weight in the state where the core wrap sheet 8 is one sheet.
In addition, when the napkin 1 of this embodiment is a "colored sheet 15 having a colored portion (low L ^* value region 16) in the central portion in the width direction and length direction", the above-mentioned preferred colored sheet may be used. The basis weight of 15 can be read as the preferable basis weight of the colored portion (low L ^* value region 16).

As an example, the basis weight of the core wrap sheet 8 made of paper is 16 g/m ² , and the basis weight of the colored sheet 15 is 57 g/m ² , and as a result of the above-mentioned evaluation using physiological saline, the core wrap The liquid diffusion area in sheet 8 was 76 cm ² , and the liquid diffusion area in colored sheet 15 was 58 cm ² .
In addition, as a result of performing the above evaluation using simulated menstrual blood with the basis weight of the core wrap sheet 8 being 16 g/m ² and the basis weight of the colored sheet 15 being 57 g/m ² , the liquid diffusion area in the core wrap sheet 8 was was 32 cm ² , and the liquid diffusion area in the colored sheet 15 was 24 cm ² .
As described above, in both evaluations using physiological saline and simulated menstrual blood, the liquid diffusivity in the colored sheet 15 is smaller than that in the core wrap sheet 8.

In this way, the liquid diffusivity can be adjusted by the basis weight, but it is also possible to adjust the density and the hydrophilicity of each of the skin-facing side of the colored sheet 15 and the non-skin-facing side of the core wrap sheet 8. It is possible to set the liquid diffusivity to the above-mentioned relationship.

Another configuration example will be described in which the liquid diffusivity of the colored sheet 15 is lower than the liquid diffusivity on the second surface 4b of the absorber 4.
The core wrap sheet 8 of the absorbent body is made of a non-woven fabric, and by applying and coating the non-woven fabric with a hydrophilic agent, the liquid diffusivity of the second surface of the absorbent body is increased, and the liquid diffusivity of the colored sheet 15 is absorbed. The liquid diffusivity may be adjusted to be less than or equal to the liquid diffusivity on the second surface of the body.

In this way, by making the liquid diffusibility of the colored sheet 15 lower than the liquid diffusivity of the second surface (non-skin side) of the absorber, menstrual blood is difficult to spread from the colored sheet 15 to the back sheet 3 in the plane direction. This prevents menstrual blood from adhering to the back sheet 3 and making it wet. As a result, even if the colored sheet 15 disposed between the absorbent body 4 and the back sheet 3 is configured to be visible through the back sheet 3, the napkin 1 can be viewed from the non-skin side of the back sheet 3. Sometimes, menstrual blood reaches the skin side of the back sheet 3 and the visibility of the menstrual blood is reduced compared to when the back sheet 3 becomes wet.
Therefore, when the napkin 1 is rolled up and disposed of with the top sheet 2 side inside, the visibility of menstrual blood from the back sheet 3 side is reduced, so the wearer and others can recognize it as menstrual blood. This reduces discomfort. Moreover, the wearer's discomfort of having the discarded napkin seen by others can be reduced.

(Position of colored sheet)
The low L ^* value region 16 of the colored sheet 15 is preferably arranged from the front region M1 through the middle region (vertical middle region) M2 to the rear region M3.

In this embodiment, the colored sheet 15 is located inside the back sheet 3 in the horizontal direction Y and the vertical direction X when viewed from above, and is located inside the absorber 4. Further, the back sheet 3 is configured so that the low L ^* value region 16 of the colored sheet 15 can be seen through the back sheet 3.
As a result, as shown in FIG. 5(A), when the napkin 1 before use is viewed from the back side, the area A of the back sheet 3 that does not overlap with the low L ^* value area 16, and the area A of the back sheet 3 that does not overlap with the low L* value area 16, and the low L ^* The area B where the value area 16 overlaps can be identified by the difference in color. Therefore, the wearer can feel secure that menstrual blood can be shielded when disposing of the napkin, and when wearing the napkin 1 on shorts, etc., the wearer can be conscious of the menstrual blood shielding effect and wear it in the correct position. It increases. As a secondary effect, when the napkin 1 is worn in the correct position, liquid leakage when worn is more likely to be suppressed. In addition, when the napkin 1 of this embodiment contains activated carbon that has a deodorizing effect, the wearer can visually recognize the deodorizing area, so the napkin 1's deodorizing function can be visually recognized. can be understood. In addition, in order to increase the motivation for the wearer to wear the napkins 1 in the correct position, the outer surface of the package containing a plurality of napkins 1 will have a menstrual blood shielding effect and the colored sheets will be used for positioning. It is preferable to write it down.

As shown in FIG. 5(B), when the napkin 1 with menstrual blood 20 adhered to it after use is viewed from the back side, the area A of the back sheet 3 where the low L ^* value area 16 does not exist, and the area A of the back sheet 3 where the menstrual blood 20 adheres Area B where both the back sheet 3 and the low L ^* value area 16 are present, and the area B where both the back sheet 3 with menstrual blood and the low L ^* value area 16 are present (the colored sheet is present) The menstrual blood adhesion area) C within the area can be identified by the difference in color.
In order to give the wearer a clean appearance of the napkin 1, a white back sheet 3 having an L ^* value of 80 or more is typically used as the back sheet 3 of the napkin 1. When constructing the napkin 1 using the back sheet 3 having such a high L ^* value, by using the colored sheet 15, the wearer (disposal worker) or another person can easily distinguish between the back sheet 3 corresponding to area A and the area. The contrast between the low L ^* value area 16 of the colored sheet 15 corresponding to area B makes it difficult to notice the contrast between the low L ^* value area 16 corresponding to area B and the menstrual blood 20 corresponding to area C.
Therefore, it is difficult for the wearer or others to recognize that it is menstrual blood, and discomfort is reduced. Moreover, the wearer's discomfort of having the discarded napkin seen by others can be reduced.

Moreover, in this embodiment, as shown in FIG. 2, the multilayer part 81 of the core wrap sheet 8 and the colored sheet 15 overlap in plan view, and the multilayer part 81 of the core wrap sheet and the colored sheet 15 have low L ^* The value area 16 overlaps in plan view.
By providing the multilayer portion 81 of the core wrap sheet 8 at the center of the absorbent body 4 in the width direction, menstrual blood tends to remain in the center of the absorbent body 4 in the width direction Y, thereby preventing menstrual blood from flowing from the colored sheet 15 to the back sheet. The diffusion in the plane direction is further suppressed, and the visibility of menstrual blood on the discarded napkin can be further reduced.

In addition, in this embodiment, the a ^* value and b ^* value of each of the low L ^* value region 16 and the back sheet 3 are both 5 or less, and the back sheet 3 is lower than the L ^* value of the low L ^* value region 16. It is more preferable that the L ^* value of is large.
With this configuration, the napkin has a hygienic appearance, and even if menstrual blood exceeds the low L ^* value range 16, it is difficult to see the menstrual blood from the back sheet 3 side. can do.
By setting the a ^* value and b ^* value of the low L ^* value area 16 and the back sheet 3 to 5 or less, a color other than a warm color similar to the color of menstrual blood can be obtained, and the napkin 1 can be Provides a hygienic appearance.
Furthermore, by making the L ^{* value of the back sheet 3 larger than the L* value} of the low L ^* value region 16, menstrual blood can be made difficult to visually recognize from the back sheet 3 side.
That is, similar to the explanation using FIG. 5(B) above, the wearer (disposal worker) or another person can distinguish between the back sheet 3 corresponding to area A and the low L ^* value area 16 corresponding to area B. Due to the contrast, the contrast between the low L ^* value region 16 corresponding to region B and the menstrual blood 20 corresponding to region C becomes difficult to notice. Therefore, visibility of menstrual blood from the back sheet 3 side is reduced.
Furthermore, as shown in FIG. 5(C), when the napkin 1 is viewed from the back side when menstrual blood has spread beyond the low L ^* value area 16, the back sheet 3 where the low L ^* value area 16 does not exist. Region A, region B where both the back sheet 3 and colored sheet 15 to which menstrual blood is not attached exist, menstrual blood adhesion region C in the region where the low L ^* value region 16 exists, and the low L ^* value The menstrual blood adhesion area D outside the area where the area 16 exists can be identified by different colors.
In this embodiment, by defining the low L ^* value region 16 of the colored sheet 15 and the L ^* value, a ^* value, and b ^* value of the back sheet 3 as described above, The contrast between the low L ^* value region 16 of the colored sheet 15 ^and the menstrual blood 20 becomes difficult for the wearer (disposal worker) and others to notice. Furthermore, even if the menstrual blood spreads beyond the low L ^* value region 16, the color of the region D will be a neutral color due to the presence of the back sheet 3, and the visibility of the menstrual blood from the back sheet 3 side will be reduced. be done.

The color of the back sheet 3 is adjusted so that the L ^* value of the color when menstrual blood spread beyond the colored sheet 15 overlaps with the back sheet 3 is closer to the low L ^* value of the colored sheet 15 and the L ^* value of the value area 16. It is preferable to set As a result, in FIG. 5C, even if menstrual blood spreads beyond the low L ^* value area 16, the L ^* value of the color in area D will approach the L ^* value of the low L ^* value area 16, so The visibility of menstrual blood from the back sheet 3 side is reduced.

From the viewpoint of clean appearance of the napkin 1, the color of the back sheet 3 is preferably a cool color that contrasts with the color of menstrual blood. Specifically, it is preferable that the L ^* value, a ^* value, and b ^* value satisfy the following ranges. The L ^* value of the back sheet 3 is preferably 80 or more, more preferably 85 or more, and preferably 99 or less, still more preferably 96 or less. The a ^* value of the back sheet 3 is preferably -22 or more and 5 or less, more preferably -20 or more and 3 or less. The b ^* value of the back sheet 3 is preferably -12 or more and 5 or less, more preferably -10 or more and 4 or less.
For the back sheet 3, a material having an a ^* value and a b ^* value of 5 or less, such as white, green, light blue, or purple, can be used.

The L ^* value of the low L ^* value region 16 in the colored sheet 15 is preferably 20 or more and 90 or less, more preferably 50 or more and 80 or less. The a ^* value of the low L ^* value region 16 is preferably -22 or more and 5 or less, more preferably -20 or more and 3 or less. The b ^* value of the low L ^* value region 16 is −12 or more and 5 or less, more preferably −10 or more and 4 or less.
Further, the L ^* value ^of the high L ^* value area 17 in the colored sheet 15 is preferably 3 or more higher than the low L ^* value area 16, and the L ^* value of the high L ^* value area 17 is preferably 50. or more, more preferably 80 or more. The a ^* value of the high L ^* value region 17 is preferably -5 or more and 5 or less, and the b ^* value is preferably -5 or more and 5 or less.

In this embodiment ^{, the} activated carbon-containing sheet was used to form a dark gray colored part, but the ^invention is not limited to this. The visibility of menstrual blood from the back sheet 3 side can be reduced.
In addition, the smaller the difference in L ^* value between the colored area before blood adhesion and the colored area after menstrual blood adhesion, the less the difference in L ^* value because it is difficult to understand the presence of menstrual blood in the area where the colored area exists. The color of the colored part may be set so that

As an example, a sheet containing an activated carbon containing sheet with a dark gray colored portion may be used as the colored sheet, and a purple sheet may be used as the back sheet 3. Note that the liquid diffusibility in the colored portion of the colored sheet is smaller than that in the core wrap sheet.
By using such a colored sheet and a back sheet, visibility of menstrual blood from the back sheet side is reduced.
The dark gray colored sheet using the activated carbon-containing sheet used here has an L ^* value of 67.6, an a ^* value of -0.2, and a b ^* value of 3.5 in the low L ^* value region. The high L ^* value region was white with an L ^* value of 95.8, an a ^* value of −0.8, and a b ^* value of 0.1. The purple back sheet had an L ^* value of 88.2, an a ^* value of 1.2, and a b ^* value of -7.7.
In the region where the low L ^* value region exists as the colored part of the laminate in which the absorber, the colored sheet, and the purple backsheet are laminated in order, the L ^* value, a ^* value, and b ^* value are calculated from the backsheet side. When measured, before the simulated menstrual blood injection, the L ^* value was 78.6, the a ^* value was 1.2, and the b ^* value was -8.1. The color after the simulated menstrual blood injection had an L ^* value of 66.9, an a ^* value of 1.5, and a b ^* value of -8.4.
In addition, when the L ^* value, a ^* value, and b ^* value of the laminate of the absorber and the purple back sheet were measured from the back sheet side, the L ^* value was 87.6 before simulated menstrual blood injection. The a ^* value was 1.7, and the b ^* value was -7.7. After the simulated menstrual blood injection, the L ^* value was 64.0, the a ^* value was 4.2, and the b ^* value was -8.1.
In this example, the difference in L ^* value depending on the presence or absence of menstrual blood in the area where the colored part of the colored sheet of the napkin exists is small, and the napkin can be made such that it is difficult to recognize menstrual blood in the area where the colored part exists.
Additionally, if menstrual blood overlaps the purple back sheet in an area where no colored part exists, the L ^* value of the color of the overlapped area will be lower than the L* value of the purple back sheet, and the dark gray colored part will be lower than the L ^* value of the purple back sheet. The color will be close to the L ^* value of . As a result, even if menstrual blood spreads beyond the colored part of the colored sheet in the napkin, the color of the area that has spread beyond the colored part approaches the L ^{* value of the colored part due to the presence of the back sheet, and the menstrual blood from the back sheet 3 side approaches the L*} value of the colored part. Blood becomes difficult to see.
A green backsheet can also be used instead of the purple backsheet. In this case, due to the complementary color relationship, the color of the area where the green of the back sheet and the red of menstrual blood overlap is a color close to black, which is lower than the L ^* value of the green back sheet, and the color of the dark gray colored sheet. The color will be close to the L ^* value. In this way, even when a green backsheet is used, menstrual blood from the backsheet 3 side is difficult to see, similar to when a purple backsheet is used.

(Positional relationship between left and right compression grooves and colored sheet)
As shown in FIG. 3, the left and right compressed grooves 6 and the low L ^* value region 16, which is the colored portion of the colored sheet 15, overlap in plan view. In this embodiment, the left and right compressed grooves 6 are located within the low L ^* value region 16, but a portion of the left and right compressed grooves 6 may be located outside the low L ^* value region 16 in plan view. .
As mentioned above, the left and right compression grooves 6 have a high fiber density and absorb and retain excreted menstrual blood through capillary action, so the left and right compression grooves 6 have a high fiber density compared to the surrounding area where the fiber density is low. , the color of the menstrual blood is more likely to appear darker, and the menstrual blood is more likely to be retained in the area surrounded by the left and right compression grooves 6. In this embodiment, since the left and right compressed grooves 6 and the low L ^* value area 16 of the colored sheet 15 overlap in plan view, menstrual blood does not spread beyond the low L ^* value area 16 in the planar direction. It's getting harder. Thereby, the visibility of menstrual blood on the discarded napkin can be efficiently reduced by the colored sheet 15.

Further, as shown in FIG. 2, second left and right compressed grooves 6b are formed on the second surface 4b side of the absorbent body 4, and are concave portions that overlap the first left and right compressed grooves 6a in plan view. The colored sheet 15 is not joined to the absorbent core 4 in the region where the second left and right compressed grooves 6b are located.
In this way, the second left and right compression grooves 6b located on the second surface 4b side where menstrual blood is easily sucked and retained by capillary action are not joined to the colored sheet 15, so the second left and right compression grooves 6b are not connected to the colored sheet 15. , the menstrual blood held in the absorbent body 4 is less likely to adhere to the colored sheet 15. Therefore, it becomes difficult for menstrual blood to diffuse into the back sheet 3 in the plane direction.

As shown in FIG. 2, in the left and right compression grooves 6, the maximum dimension D2 in the lateral direction Y between the pair of compression grooves in the intermediate region M2 is the maximum dimension D2 between the pair of compression grooves in the front region M1 and the rear region M3, respectively. It is wider than dimensions D1 and D3. As a result, in the absorbent body 4, menstrual blood that has spread in the lateral direction Y in the intermediate region M2 is pulled back inward in the lateral direction Y in the front and rear regions M1 and M3 when it spreads in the front and back directions.
The low L ^* value region 16 is arranged so as to overlap, in plan view, the portion of the left and right compressed grooves 6 that has the maximum dimension in each of the front region M1, intermediate region M2, and rear region M3. In this embodiment, the entire left and right compression grooves 6 overlap with the low L ^* value region 16. This further ensures that the visibility of menstrual blood in the discarded napkin is reduced.

[Additional explanation of this embodiment]
The explanation of this embodiment will be supplemented below.
(Measurement method of basis weight)
The basis weights of the core wrap sheet 8 and the colored sheet 15 were measured as follows.
Core wrap sheet 8 (colored sheet 15) is cut using a single-edged razor manufactured by Feather Co., Ltd. to obtain 5 small pieces. Here, a small piece having a width of 40 mm and a length of 100 mm is collected from the center in the width direction of the region facing the excretory part. If the core wrap sheet 8 and the colored sheet are less than 40 mm wide and 100 mm long, they are cut to the maximum width and length that can be collected and measured.
The weight of the small piece is measured using an electronic balance (electronic balance GR-300 manufactured by A&D, accuracy: 4 digits after the decimal point). The basis weight of the small piece is calculated by dividing the obtained weight by the area of the small piece, and the average of the basis weight of the five small pieces is taken as the basis weight.

(antibacterial agent)
Known antibacterial agents can be used. As the antibacterial agent, it is preferable to use an organic antibacterial agent. When the odor-causing substances in excrement are organic, organic antibacterial agents can be gaseous with high antibacterial and deodorizing properties due to their good affinity with the odor-causing substances. From the viewpoint of affinity with organic odor-causing substances and bacteria, organic cationic antibacterial agents are particularly preferred. Cationic antibacterial agents can suppress the generation of strong putrid odors as a control of malodor production. Therefore, in this specification, antibacterial agents are a concept included in deodorants.

Cationic antibacterial agents are organic compound-based antibacterial agents that elute into excreta such as urine more often than metal ion-based agents such as silver, zinc, and copper, and have a wide range of antibacterial effects. In particular, quaternary ammonium salts such as didecyldimethylammonium salts, alkylpyridinium salts, benzethonium salts, benzalkonium salts, monoalkyltrimethylammonium salts, and dialkyldimethylammonium salts are mentioned, and at least one salt selected from the group consisting of Preferably, it contains seeds. These cationic antibacterial agents may be used alone or in combination of two or more.

(Deodorants)
A deodorant itself is a substance that can directly act on odors, that is, adsorb, neutralize, decompose, etc., to exert a deodorizing effect, and is widely used in deodorizing applications in this technical field. However, porous deodorizing granules are preferable because they have a wide deodorizing spectrum against odors. Examples of porous deodorizing granules include inorganic deodorizing granules and organic deodorizing granules. Inorganic deodorizing granules are deodorizing granules mainly composed of inorganic compounds, that is, deodorizing granules in which the compound serving as the skeleton of the deodorant granules is an inorganic compound. The organic deodorizing granules are deodorizing granules mainly composed of organic compounds, that is, deodorizing granules in which the compound serving as the skeleton of the deodorizing granules is an organic compound.
In this way, by using a deodorizing agent in addition to an antibacterial agent, it is possible to further suppress the occurrence of bad odors.

Preferred inorganic deodorizing particles include cancrinite-like minerals, zeolites, montmorillonites, activated carbon, and the like. Among these, porous deodorizing granules having polarity are preferred because they are suitable for deodorizing water-soluble odor-causing substances, and cancrinite-like minerals and zeolites have a wide deodorizing spectrum. preferable. Since activated carbon is non-polar, it is effective in deodorizing organic odor components, and examples thereof include coconut shell charcoal, charcoal, blue coal, peat, and lignite.
Preferred organic deodorizing particles include particles obtained by copolymerizing monomer components containing a crosslinkable vinyl monomer and a vinyl monomer having a heteroaromatic ring.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

For example, in the above-described embodiment, an example is given in which the absorbent body is composed of an absorbent core and a core wrap sheet, but the absorbent body may be composed only of an absorbent core without a core wrap sheet. Even in this case, it is sufficient that the liquid diffusivity of the colored sheet is equal to or lower than the liquid diffusibility of the surface of the absorber on the colored sheet side (non-skin side).
Further, for example, the napkin 1 may not have the wing portion W, or may be configured to be long in the vertical direction X for night use and may have a rear flap in the rear region M3.
The intermediate region M2 in the case of not having the wing portion W is the central region when the entire length of the napkin 1 in the longitudinal direction X is divided into three equal parts and divided into three regions.

Further, in the above-described embodiment, the planar shape of the colored portion is rectangular, but the shape is not limited to this. For example, like the colored portion 46 of the colored sheet 45 shown in FIG. 6, both ends 46a in the lateral direction Y may have a shape including a curved line that is convex outward in the lateral direction Y.
Since menstrual blood typically spreads in an elliptical shape, the end of the menstrual blood diffusion section in the lateral direction Y forms a curved line that is outwardly convex. By forming both ends 46a of the colored portion 46 into a curved line having a convex shape outward in the lateral direction Y, when menstrual blood spreads beyond the colored portion 46, the spread of menstrual blood becomes difficult to be recognized. , the visibility of menstrual blood on discarded napkins can be further reduced.

Further, the colored sheet may be colored with a uniform density within the surface, or may have shading within the surface. Since the color of the colored sheet has shading, the region where the colored sheet becomes darker due to absorption of menstrual blood becomes more difficult to recognize, and visibility of menstrual blood on the discarded napkin can be reduced.

Further, in the above-described embodiment, an example was given in which the colored sheet is composed of a low L ^* value region and a high L ^* value region corresponding to the colored portion, but the present invention is not limited to this. For example, a colored sheet may have only colored areas without high L ^* value areas. Such colored sheets, for example, when forming a colored sheet by sandwiching an activated carbon-containing sheet between two covering sheets, are constructed by making the outer shape of the covering sheet the same as the outer shape of the activated carbon-containing sheet. .

1... Napkin (absorbent article)
2... Top sheet 3... Back sheet 4... Absorber 4a... First surface 4b... Second surface 15... Colored sheet

Claims (8)

an absorbent body having a first surface and a second surface; a top sheet disposed on the first surface side of the absorbent body; and a back sheet disposed on the second surface side of the absorbent body. An absorbent article comprising: a width direction and a front-back direction that are orthogonal to each other, and an excretion part facing region, and a front region and a rear region located in the front and back direction via the excretion part facing region. hand,
a colored sheet disposed between the absorbent body and the back sheet;
a pair of left and right compression grooves extending in the front-rear direction and located in the width direction, which are provided on the first surface and integrate the top sheet and the absorbent body;
a second left and right compression groove provided on the second surface and serving as a recess that overlaps the first left and right compression groove in plan view;
The colored sheet includes a low L ^* value area as a colored part, and a belt-shaped high L that is located on both sides in the width direction outward from the low L ^* value area and has a higher L ^* value than the low L ^* value area. ^* Equipped with a value area,
The colored portion is configured to be transparent through the back sheet, and the liquid diffusivity of the colored sheet is equal to or lower than the liquid diffusivity of the second surface of the absorber,
The first left and right compressed grooves and the second left and right compressed grooves have a higher density of fibers constituting the absorbent body than surrounding areas,
In the excretion part facing region, the first left and right compression grooves and the second left and right compression grooves and the low L ^* value region overlap in plan view,
The high L ^* value region is arranged outward in the width direction from the first left and right compression grooves and the second left and right compression grooves,
The colored sheet is not joined to the absorbent body in the region where the second left and right compression grooves are located. The absorbent article. The absorbent article according to claim 1, wherein the colored portion is located inside the peripheral edge of the backsheet in the width direction and the front-back direction. The absorbent body has an absorbent core and a core wrap sheet that covers the absorbent core,
The core wrap sheet constitutes the first surface and the second surface, and the second surface has a multilayer portion in which a plurality of the core wrap sheets overlap,
The absorbent article according to claim 1 or 2, wherein the colored portion overlaps the multilayer portion in plan view. The maximum dimension in the width direction between the pair of first left and right compression grooves in the excretion part facing region is larger than the maximum dimension in the width direction between the pair of first right and left compression grooves in the front region and the rear region. big,
The colored portion overlaps, in plan view, a portion of the pair of first left and right compression grooves having a maximum dimension in the width direction in each of the excretion part facing region, the front region, and the rear region. The absorbent article according to any one of the items. The a ^* value and b ^* value in the CIE-L ^* a ^* b ^* color system of the colored part and the back sheet are both 5 or less, and the L ^* value of the back sheet is larger than the L ^* value of the colored part. The absorbent article according to any one of claims 1 to 4. The absorbent article according to any one of claims 1 to 5, wherein the colored portion includes a curved line whose end portion in the width direction is convex outward in the width direction. The absorbent article according to any one of claims 1 to 6, wherein the colored sheet has shading. The absorbent article according to any one of claims 1 to 7, wherein the colored sheet contains a deodorant.

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