JP5783738B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article. The present invention relates to an absorbent article in which a predetermined pattern can be seen from both the top sheet side and the back sheet side at a low manufacturing cost.

  Absorbent articles such as sanitary napkins, panty liners, etc., as described in Patent Document 1, at first glance are difficult to recognize that they are sanitary napkins, and absorbed menstrual blood is visible from the outside. In order to avoid such a situation, it is known that a certain pattern is printed on the back sheet of the absorbent article.

  On the other hand, as described in Patent Document 2, in order to make the absorption performance of the absorbent article visible, an absorbent article, for example, one in which a certain pattern can be seen from the top sheet side of a sanitary napkin is also known. .

JP 2003-199786 A Special table 2005-512682

However, there is no known absorbent article in which a certain pattern can be seen from both the top sheet side and the back sheet side of the absorbent article, and the absorbent line has a printing line that gives a pattern visible from the top sheet side. Providing two printing lines, that is, a printing line with a pattern visible from the back sheet side, increases the manufacturing cost and also increases the maintenance cost of manufacturing equipment.
Therefore, an object of the present invention is to provide an absorbent article in which a predetermined pattern can be seen from both the top sheet side and the back sheet side, which are low in production cost.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have made an absorption including a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent sheet between the top sheet and the back sheet. The absorbent sheet has a first surface having a colored portion and a second surface on the opposite side of the first surface through which the colored portion of the first surface cannot be seen. The absorbent sheet is disposed between the top sheet and the back sheet in a state in which the second sheet faces inward and is folded at least once along the folding line, and the top of the absorbent article. From the sheet side, the colored portion disposed on the surface closest to the top sheet of the absorbent sheet can be seen through, and from the back sheet side of the absorbent article, the surface of the absorbent sheet closest to the back sheet Placed in That the absorbent article, characterized in that the colored portion is seen through, can solve the above problems, and have completed the present invention.

Specifically, the present invention relates to the following aspects.
[Aspect 1]
An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent sheet between the top sheet and the back sheet,
The absorbent sheet has a first surface having a colored portion, and a second surface on the opposite side of the first surface, where the colored portion of the first surface is not seen through,
The absorbent sheet is disposed between the top sheet and the back sheet in a state of being folded at least once along the folding line with the second surface facing inward.
From the top sheet side of the absorbent article, the colored portion arranged on the surface closest to the top sheet of the absorbent sheet is seen through, and from the back sheet side of the absorbent article, The colored portion arranged on the surface closest to the back sheet is seen through,
The above absorbent article.

[Aspect 2]
The absorbent article according to aspect 1, wherein the absorbent sheet is folded twice along the two fold lines extending substantially in the longitudinal direction of the absorbent article with the second surface facing inward.
[Aspect 3]
The absorbent article according to aspect 1, wherein the absorbent sheet is folded with a second surface facing inward along one fold line extending in a substantially longitudinal direction of the absorbent article.

[Aspect 4]
The absorbent article according to any one of aspects 1 to 3, further comprising an absorbent core covered with the absorbent sheet.
[Aspect 5]
The absorptive article according to any one of embodiments 1 to 4, which is an individually packaged sanitary napkin or a panty liner.

[Aspect 6]
An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent core and an absorbent sheet between the top sheet and the back sheet,
The said absorption sheet has the 1st surface which has a coloring part, and the 2nd surface on the opposite side of a 1st surface, and the said absorption sheet faces a 2nd surface inside, and the said absorption core Between the top sheet and the back sheet in a state of being folded at least twice along at least two folding lines.
The colored portion is disposed only on the surface of the absorber closest to the top sheet and the surface closest to the back sheet,
In the absorbent body, the colored portion of the surface closest to the back sheet from the surface closest to the top sheet cannot be seen through, and the colored portion of the surface closest to the back sheet from the surface closest to the top sheet cannot be seen through. ,
From the top sheet side of the absorbent article, the colored portion arranged on the surface closest to the top sheet of the absorbent sheet is seen through, and from the back sheet side of the absorbent article, The colored portion arranged on the surface closest to the back sheet is seen through,
The above absorbent article.

[Aspect 7]
It is a manufacturing method of the absorptive article according to any one of aspects 1-6,
Next steps,
Preparing a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorbent sheet, and an optional absorbent core;
Forming a colored portion on the first surface of the absorbent sheet;
Step of folding the absorbent sheet with the absorbent core in between, with the second surface facing inward, and folding at least once, and the liquid-permeable top sheet and the liquid-impermeable back sheet , A step of bonding the absorbent sheet between them,
Including methods.

  Since the absorbent article of the present invention in which a predetermined pattern can be seen from both the top sheet side and the back sheet side can be easily manufactured, the manufacturing cost is low.

FIG. 1 is a front view and a rear view of one embodiment of an absorbent article of the present invention. FIG. 2 is a cross-sectional view taken along the line AA of the absorbent article 1 shown in FIG. FIG. 3 is a development view of the absorbent sheet 4 of the absorbent article 1 shown in FIG. FIG. 4 is a development view of the absorbent sheet in another embodiment of the absorbent article of the present invention. FIG. 5 is a view showing one embodiment of an absorbent article including the absorbent sheet 4 shown in FIG. 4. FIG. 6 is a view showing still another embodiment of the absorbent article of the present invention. FIG. 7 is a view showing still another embodiment of the absorbent article of the present invention.

The absorbent article of the present invention will be described in detail below.
FIG. 1 is a front view and a rear view of one embodiment of an absorbent article of the present invention. FIG. 1A is a front view on the top sheet side, and FIG. 1B is a rear view on the back sheet side. The absorbent article 1 shown in FIG. 1 includes a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, an absorbent sheet 4, a side sheet 6, and a fixing portion 8 for underwear. A predetermined pattern 5 can be seen from both the top sheet side and the back sheet side. Moreover, the absorbent article 1 shown by FIG. 1 has the pressing part 7. FIG.

  FIG. 2 is a cross-sectional view of the absorbent article 1 shown in FIG. In the absorbent article 1 shown in FIG. 2, the absorbent sheet 4 is disposed between the top sheet 2 and the back sheet 3, and the absorbent sheet 4 has a colored portion 9 (the colored portion 9 is closest to the top sheet). First surface 10 (first surface closest to the top sheet) divided into a colored portion 9 ′ of the first surface 10 ′ and a colored portion 9 ″ of the surface 10 ″ closest to the backsheet 10 ′ and the first surface 10 ″ closest to the backsheet) and the second surface on the opposite side of the first surface 10 where the colored portion of the first surface 10 is not seen through 11.

  In addition, the absorbent article 1 shown by FIG. 2 has the pressing part 7 formed by pressing the top sheet 2 and the absorption sheet 4 together. Further, in the absorbent article 1 shown in FIG. 2, the side edges of the absorbent article 1 in the width direction of the first surface 10 ′ closest to the top sheet and the first surface 10 ″ closest to the back sheet are used. The positions are approximately the same.

  In the absorbent article 1 shown in FIG. 2, the colored portion 9 ′ of the surface 10 ′ closest to the top sheet of the absorbent sheet 4 can be seen through from the side of the top sheet 2 of the absorbent article 1, thereby absorbing the absorbent article 4. A pattern visible from the top sheet 2 side of the absorbent article 1 is formed, and from the back sheet 3 side of the absorbent article 1, the colored portion 9 ′ of the surface 10 ″ of the absorbent sheet 4 closest to the back sheet. 'Is seen through, thereby forming a pattern visible from the back sheet 3 side of the absorbent article 1.

  In the absorbent article of the present invention, as will be described later, the absorbent sheet has a low total light transmittance and does not transmit the reflected light reflected by the colored portion. Therefore, the colored color present from the second surface to the first surface. I can't see the department.

Accordingly, in the absorbent article 1 shown in FIG. 2, the reflected light reflected by the colored portion 9 ″ of the surface 10 ″ closest to the back sheet does not pass through the absorbent sheet 4 and the top sheet of the absorbent article 1 The reflected light that cannot be seen from the side 2 and reflected by the colored portion 9 ′ of the surface 10 ′ closest to the top sheet does not pass through the absorbent sheet 4 and is the same as that of the back sheet 3 of the absorbent article 1. I can't see it from the side.
In addition, as another embodiment of this invention, the absorbent article further includes an absorbent core, and the absorbent sheet covers the absorbent core.

  FIG. 3 is a development view of the absorbent sheet 4 of the absorbent article 1 shown in FIG. The absorbent sheet 4 has a first surface 10 having a colored portion 9 (the colored portion 9 includes a colored portion 9 ′ and a colored portion 9 ″), and the colored portion 9 of the first surface 10 is transparent. In the absorbent article 1, the absorbent sheet 4 faces the second surface 11 inward and the absorbent article 1 is invisible. Is folded once along a fold line ff extending substantially in the longitudinal direction. In other words, the absorbent sheet 4 is folded once along the fold line ff with the first surface 10 facing outward.

  By being folded once along the fold line ff, the first surface 10 is divided into a surface 10 ′ closest to the top sheet and a surface 10 ″ closest to the back sheet, and the colored portion 9 Is divided into a colored portion 9 ′ on the surface 10 ′ closest to the top sheet and a colored portion 9 ″ on the surface 10 ″ closest to the backsheet.

FIG. 4 is a development view of the absorbent sheet in another embodiment of the present invention. In FIG. 4, the absorbent sheet 4 includes colored portions 9 (the colored portions 9 are colored portions 9 ′ on the surface 10 ′ closest to the top sheet and colored portions 9 ″ on the surface 10 ″ closest to the back sheet). A first surface 10 having a second surface 11 on the opposite side of the first surface 10 where the colored portion 9 of the first surface 10 cannot be seen through, and the absorbent sheet 4. In the absorbent article 1, the second surface 11 faces inward and the two folding lines f ₁ -f ₁ and f ₂ -f ₂ extending in the substantially longitudinal direction of the absorbent article 1 are 2. Folded times.

By being folded twice along the two fold lines f ₁ -f ₁ and f ₂ -f ₂ , the first surface 10 has three surfaces, that is, the surface 10 ′ closest to one topsheet and The surface 10 '' closest to the two backsheets and the colored portion 9 'is above the surface 10' closest to the topsheet and the surface 10 closest to the two backsheets It is divided into a colored part 9 '' above ''.
In the absorbent sheet 4, the colored portion 9 on the first surface 10 cannot be seen through from the second surface 11.

  In addition, in the absorbent sheet 4 shown in FIG. 4, the colored portion 9 ″ is present on both of the surfaces 10 ″ closest to the two backsheets, but in another embodiment, from the backsheet side of the absorbent article. As long as a visible pattern is formed, a colored portion may be present on any of the surfaces 10 ″ closest to the backsheet.

FIG. 5 is a view showing one embodiment of an absorbent article including the absorbent sheet shown in FIG. 4. FIG. 5 corresponds to a cross-sectional view of the absorbent article 1 shown in FIG. 1 in the AA cross section, and the pattern seen from the outside is equivalent to the absorbent article 1 shown in FIG.
The absorbent article 1 shown in FIG. 5 includes a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, an absorbent sheet 4, a side sheet 6, and a fixing portion 8 for underwear. In the absorbent article 1 shown in FIG. 5, the absorbent sheet 4 is disposed between the top sheet 2 and the back sheet 3, and the absorbent article 1 shown in FIG. 5 includes the top sheet 2 and the absorbent sheet. 4 has a pressing part 7 formed by pressing together.

  In the absorbent article 1 shown in FIG. 5, the colored portion 9 ′ of the surface 10 ′ closest to the top sheet of the absorbent sheet 4 can be seen through from the side of the top sheet 2 of the absorbent article 1. A pattern visible from the top sheet 2 side of the article 1 is formed, and from the back sheet 3 side of the absorbent article 1, the colored portion 9 '' of the surface 10 '' of the absorbent sheet 4 closest to the back sheet is transparent. The pattern which can be seen from the back sheet 3 side of the absorbent article 1 is thereby formed. Further, in the absorbent article 1 shown in FIG. 5, the positions of the side edges in the width direction of the absorbent article 1 of the two first surfaces 10 ″ closest to the backsheet are substantially the same.

  Further, in the absorbent article 1 shown in FIG. 5, the reflected light reflected by the colored portion 9 ″ of the surface 10 ″ closest to the back sheet does not pass through the absorbent sheet 4 and the top sheet of the absorbent article 1 The reflected light that cannot be seen from the side 2 and reflected by the colored portion 9 ′ of the surface 10 ′ closest to the top sheet does not pass through the absorbent sheet 4 and is the same as that of the back sheet 3 of the absorbent article 1. I can't see it from the side.

In the absorbent article as shown in FIG. 5, the absorbent sheet has folded portions F ₁ and F ₂ at both ends in the width direction of the absorbent article, and the right and left softness in the width direction of the absorbent article. Since the difference is less likely to occur, there is an effect of excellent wearing feeling. Moreover, since it is easy to deform | transform so that a cross section may become an inverted V shape centering on the center part (code | symbol C in FIG. 5) of the width direction of an absorbent article, the effect which is easy to fit a body at the time of wear is acquired.

FIG. 6 is a view showing still another embodiment of the absorbent article of the present invention. FIG. 6 corresponds to a cross-sectional view of the absorbent article 1 shown in FIG.
The absorbent article 1 shown in FIG. 6 includes a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, an absorbent sheet 4, an absorbent core 12, a side sheet 6, and a fixing part to an undergarment. 8, the absorbent sheet 4 is disposed between the top sheet 2 and the back sheet 3, and the absorbent core 12 is covered with the absorbent sheet 4. Moreover, the absorbent article 1 shown by FIG. 6 has the pressing part 7 formed by pressing the top sheet 2, the absorption sheet 4, and the absorption core 12 together.

As shown in FIG. 6, the absorbent sheet 4 is folded twice along the two fold lines f ₁ -f ₁ and f ₂ -f ₂ shown in FIG. 4 with the absorbent core 12 in between. An absorbent body including the absorbent sheet 4 and the absorbent core 12 is formed.

  In the absorbent article 1 shown in FIG. 6, the surface 10 ′ of the absorbent sheet 4 closest to the top sheet from the side of the top sheet 2 of the absorbent article 1 is the same as that shown in FIGS. 2 and 4. By seeing through the colored portion 9 ′, a pattern that is visible from the top sheet 2 side of the absorbent article 1 is formed, and from the back sheet 3 side of the absorbent article 1 to the back sheet of the absorbent sheet 4 A pattern that can be seen from the back sheet side of the absorbent article 1 is formed by allowing the colored portion 9 '' of the near surface 10 '' to be seen through.

  Since the absorbent article as shown in FIG. 6 further includes an absorbent core, it can absorb a larger amount of menstrual blood, and further, after menstrual blood is absorbed, menstrual blood hardly reaches the back sheet side. The absorbed menstrual blood is less likely to be seen from the back sheet side.

FIG. 7 is a view showing still another embodiment of the absorbent article of the present invention. FIG. 7 corresponds to a cross-sectional view of the absorbent article 1 shown in FIG.
The absorbent article 1 shown in FIG. 7 includes a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, an absorbent sheet 4, a side sheet 6, and a fixing portion 8 for underwear. The absorbent sheet 4 is disposed between the top sheet 2 and the back sheet 3. Moreover, the absorbent article 1 shown by FIG. 7 has the pressing part 7 formed by pressing the top sheet 2 and the absorption sheet 4 together.

The absorbent sheet 4 in FIG. 7 includes three fold lines f ₁ -f ₁ and f ₂ -f ₂ that extend in the substantially longitudinal direction of the absorbent article 1 in FIG. After arranging the absorbent sheets 4 so that the areas are substantially equal and folding the absorbent sheet 4 at the fold line f ₁ -f ₁ , the absorbent sheet 4 is folded at the fold line f ₂ -f ₂ or the fold line f ₂ -f. After the absorbent sheet 4 is folded at ₂ , the absorbent sheet 4 can be folded at the fold line f ₁ -f ₁ .

  Note that the absorbent sheet 4 shown in FIG. 7 has a colored portion 9 (colored portion 9 ′ and colored portion 9) on two surfaces, a surface 10 ′ closest to the top sheet and a surface 10 ″ closest to the back sheet. ''), But in another embodiment of the invention, the other surface, for example, the surface sandwiched between the surface 10 'closest to the topsheet and the surface 10' 'closest to the backsheet There may be colored portions.

In the absorbent article 1 shown in FIG. 7, the surface 10 ′ of the absorbent sheet 4 closest to the top sheet from the side of the top sheet 2 of the absorbent article 1 is the same as that shown in FIGS. 2 and 4. The colored portion 9 'can be seen through, thereby forming a pattern visible from the top sheet 2 side of the absorbent article 1, and from the back sheet 3 side of the absorbent article 1 to the back sheet of the absorbent sheet 4 most The colored portion 9 '' of the near surface 10 '' can be seen through, thereby forming a pattern that can be seen from the back sheet 3 side of the absorbent article 1.
In addition, as another embodiment of embodiment shown by FIG. 7, the absorbent article can further include an absorbent core, and the absorbent sheet covers the absorbent core.

  In this specification, the term “invisible” used for the absorbent sheet is measured according to “Measurement method A” of 5.5.2 of JIS K7105-1981 of the absorbent sheet used in the present invention. It means that the “total light transmittance” is 40% or less.

The total light transmittance can be measured under the following conditions using, for example, a colorimetric color difference meter (model NDH-300A) manufactured by Nippon Denshoku Industries Co., Ltd.
-Light receiving element: Silicon photocell according to JIS K7105-1981-Filter: Color glass filter Y
・ Measurement area: φ12mm

If the total light transmittance is 40% or less, only 40% or less of the reflected light reflected by the colored portion of the first surface is transmitted to the second surface side. The colored part on the surface of 1 becomes difficult to see.
The total light transmittance is preferably 35% or less, more preferably 30% or less, because the colored portion of the first surface cannot be seen through from the second surface. More preferably, it is 25% or less.

  The absorbent sheet used in the present invention is particularly limited as long as printing is possible and the colored portion of the first surface is not seen through the second surface (having a hiding power). Instead, for example, an airlaid sheet composed of pulp, an air-through nonwoven fabric, a spunlace nonwoven fabric and the like are mentioned, and an airlaid sheet is preferred. This is because the bulk is high, the total light transmittance tends to be low, and the colored portion is easily formed by printing or the like.

  The total light transmittance varies depending on, for example, the basis weight of the fiber constituting the absorbent sheet, the bulk, the thickness of the fiber, the pigment contained in the fiber, for example, the proportion of titanium oxide, etc. The higher the bulk and the thinner the fiber, the lower the total light transmittance (the higher the concealment rate).

For example, in the case of an airlaid sheet composed of pulp, the transmittance is less than 40% by using a basis weight of about 85 g / m ² and a thickness of about 0.7 mm. Further, in the case of an air-through non-woven fabric, if it is attempted to achieve a transmittance of 40% or less with a large basis weight, about 180 g / m ² (when the fiber diameter is about 2.2 dtex) is required, which is inferior in practicality. Therefore, when an absorbent sheet is formed from an air-through nonwoven fabric, it may be necessary to lower the total light transmittance by increasing the bulk or adding a pigment.

  The colored portion of the first surface is not particularly limited, and is formed by using a method usually used in the art, for example, a printing means such as gravure printing, screen printing, flexographic printing, or coloring. And the like formed by applying the applied hot melt or the like from a nozzle or the like.

For example, by using gravure printing, a colored portion can be formed on the first surface of the absorbent sheet while changing the amount per unit area with a single colored material. The means such as gravure printing is advantageous from the viewpoint of manufacturing cost because the density can be expressed from a single colored material by changing the amount per unit area.
Alternatively, the colored portion can be formed on the first surface of the absorbent sheet with a plurality of colored materials having different colors using means such as screen printing and flexographic printing.

  In the present specification, the terms “visible through” or “visible” relating to the pattern that can be seen from the top sheet side and the back sheet side of the absorbent article are the total light transmittance of the top sheet side and the back sheet, respectively. , Meaning over 40%.

When the total light transmittance is more than 40%, the light transmitted through the top sheet or the back sheet is reflected by the colored portion on the surface closest to the top sheet or the colored portion on the surface closest to the back sheet, respectively. Human eyes can easily recognize the pattern formed by the colored portion.
The total light transmittance of the top sheet side and / or the back sheet is preferably more than 45%, more preferably more than 50%, and more than 55% so that the colored portion can be seen more transparently. More preferably.

As the top sheet satisfying the light transmittance requirement, those usually used in the technical field can be selected without particular limitation. For example, a nonwoven fabric, a woven fabric, or all or a part thereof is liquid. Examples thereof include a resin film that is permeable and has a large number of liquid-permeable holes, and a net-like sheet that has a large number of meshes. Examples of the nonwoven fabric include spunlace nonwoven fabric formed from cellulose fibers such as rayon, synthetic resin fibers, and the like, and air-through nonwoven fabric formed from the synthetic resin fibers.
Examples of the resin film and net-like sheet include those formed from polypropylene, polyethylene, polyethylene terephthalate, and the like.

As the top sheet, if it is usually used in this technical field, the above-mentioned requirements for the total light transmittance are generally satisfied, and a predetermined pattern can be seen. Accordingly, the top sheet is preferably in the range of about 5 to about 100 g / m ² , more preferably in the range of about 20 to about 50 g / m ² , and even more preferably about the performance as an absorbent article. It should have a basis weight in the range of 10 to about 40 g / m ^2.

  In the top sheet as well, when the top sheet contains fibers, the total light transmittance is such that the larger the basis weight of the fibers constituting the top sheet, the higher the bulk, the thinner the fibers, and the fibers. The higher the proportion of the pigment contained in the toner, the lower the total light transmittance, and when the top sheet is a resin film, the thicker the thickness, the greater the amount of colorant such as pigment, There is a tendency that the total light transmittance is lowered.

  As the back sheet that satisfies the above requirements for light transmittance, those that are usually used in the art can be used without particular limitation as long as they have liquid impermeability, such as low density. A polyethylene sheet etc. are mentioned.

As the backsheet, if it is usually used in the technical field, it generally satisfies the requirements of the total light transmittance and a predetermined pattern can be seen. Should have a basis weight in the range of about 15 to about 40 g / m ² .
In the back sheet as well, the total light transmittance tends to decrease as the thickness increases and the amount of colorant such as pigment increases.

In the absorbent article of the present invention, the side sheet is an optional element and, if present, can be the same as the top sheet.
In the absorbent article of the present invention, the fixing part is an optional element, and when present, an adhesive usually used in the art, such as a hot-melt adhesive, such as a polyolefin (for example, polyethylene) And polypropylene) hot melt adhesive, ethylene / vinyl acetate copolymer hot melt adhesive, synthetic rubber (for example, styrene copolymer, butadiene copolymer, isoprene copolymer) hot melt adhesive, acrylic resin adhesive, Examples thereof include polyvinyl alcohol pressure-sensitive adhesives.
The fixing part may be an adhesive made of an acrylic emulsion having a hydrophilic protective colloid layer.

  In this specification, the absorbent core is an optional element such as ground pulp, chemical pulp, cellulose fiber, and artificial cellulose fiber such as rayon and acetate, synthetic fiber, and a sheet formed therefrom, such as airlaid. Examples thereof include a sheet and a through-air nonwoven fabric. The absorbent core may further include a superabsorbent polymer, for example, a starch-based, acrylic acid-based, amino acid-based particulate or fibrous polymer.

The absorbent article of this invention can be manufactured as follows.
A liquid-permeable top sheet, a liquid-impermeable back sheet, an absorbent sheet, and an optional absorbent core are prepared, and then a colored portion is formed on the first surface of the absorbent sheet. The said colored part can be obtained by printing an absorption sheet using printing means, such as the above-mentioned gravure printing, screen printing, flexographic printing, for example.

Next, the absorbent sheet is folded, if desired, with the absorbent core in between, with the second surface facing inward, and folded at least one time, and the liquid-permeable top sheet, the liquid-impermeable back sheet, Are bonded together with the absorbent sheet in between.
Before the liquid-permeable top sheet and the liquid-impermeable back sheet are bonded together with the absorbent sheet sandwiched therebetween, the liquid-permeable top sheet and the absorbent sheet are squeezed, A pressing part can also be formed. Moreover, a pressing part can also be formed by pressing only an absorption sheet.

  In the absorbent article of the present invention, the top sheet and / or the back sheet may be provided with a pattern. A more complicated pattern can be formed by combining the pattern of the top sheet and / or the back sheet itself with the pattern formed by the colored portion arranged on the first surface of the absorbent sheet.

  Examples of the absorbent article of the present invention include individually packaged sanitary napkins, panty liners, incontinence pads, disposable diapers and the like. From the viewpoint of making the absorbed menstrual blood inconspicuous, A panty liner is preferred.

  In the present invention, with the absorbent sheet alone, the colored portion of the first surface can be seen through from the second surface, but when the absorbent sheet is combined with the absorbent core, the colored portion of the first surface is Embodiments that are not visible through can also be included.

An example of the above embodiment will be described with reference to FIG.
As shown in FIG. 6, the absorbent article according to the embodiment includes a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, an absorbent sheet 4, an absorbent core 12, and a side sheet 6. And the fixing part 8 to the underwear, the absorbent sheet 4 is disposed between the top sheet 2 and the back sheet 3 together with the absorbent core 12. Moreover, the absorbent article 1 has the pressing part 7 formed by pressing the top sheet 2, the absorption sheet 4, and the absorption core 12 together.

  The absorbent sheet 4 is folded twice along two fold lines with the absorbent core 12 in between, thereby forming an absorbent body including the absorbent sheet 4 and the absorbent core 12 as shown in FIG. Yes.

In the absorbent article 1, the colored portion 9 ′ and the colored portion 9 ″ are disposed only on the surface 10 ′ closest to the top sheet and the surface 10 ″ closest to the back sheet of the absorber. The absorbent sheet 4 alone can be seen through the colored portion 9 ′ and the colored portion 9 ″ of the first surface 10 from the second surface 11, but by combining the absorbent sheet 4 and the absorbent core 12. In the absorbent body, the colored portion 9 ″ of the surface 10 ″ closest to the backsheet cannot be seen through from the surface 10 ′ closest to the topsheet, and the surface 10 ″ closest to the backsheet The colored portion 9 ′ of the surface 10 ′ closest to is not seen through.
In other words, in the said embodiment, although an absorption sheet has a total light transmittance of 40% or more, an absorber has a total light transmittance of 40% or less in the thickness direction.

  As a result, from the side of the top sheet 2 of the absorbent article 1, the colored portion 9 ′ disposed on the surface 10 ′ closest to the top sheet of the absorbent sheet 4 can be seen through, but the surface 10 closest to the back sheet can be seen through. The colored portion 9 ″ disposed on ″ cannot be seen through, and is disposed on the surface 10 ″ of the absorbent sheet 4 closest to the back sheet from the back sheet 3 side of the absorbent article 1. The colored portion 9 '' can be seen through, but the colored portion 9 'disposed on the surface 10' closest to the top sheet cannot be seen through.

Hereinafter, although an example is given and the present invention is explained, the present invention is not limited to these examples.
[Example 1]
Regarding the absorbent sheet, the relationship between the basis weight and the total light transmittance was investigated.
An airlaid sheet (5 cm × 5 cm) composed of 100% softwood pulp and having a different basis weight was prepared as an absorbent sheet.
The transmittance was measured according to the method described above using a colorimetric color difference meter (model NDH-300A) manufactured by Nippon Denshoku Industries Co., Ltd. The measurement was performed three times at different locations, and the average value was adopted. The results are shown in Table 1 below.

  In addition, a colored portion having a star pattern is formed on the first surface of the absorbent sheet by flexographic printing, and whether or not the pattern can be observed from the second surface on the opposite side is visually evaluated by a plurality of people. . The visual evaluation was performed under an indoor fluorescent lamp. The results are shown in Table 1. In Table 1, “O” means that the pattern of the first surface was visible from the second surface, and “X” means that the pattern of the first surface was not visible.

[Example 2]
As a typical example of the top sheet, an air-through nonwoven fabric (fiber diameter: 2.2 dtex, basis weight: 25 g / m ² , thickness: about 0.3 mm) was prepared, and the total light transmittance was measured in the same manner as in Example 1. As a result of visual evaluation, the total light transmittance was 71.5%, and the result of the visual evaluation was ◯.

As a typical example of the back sheet, a breathable back sheet (basis weight 35 g / m ² ) made of a polyethylene film was prepared, and the total light transmittance was measured and visually evaluated in the same manner as in Example 1. The rate was 49.3%, and the result of visual evaluation was ◯.
From the above, it can be seen that, with a standard topsheet and backsheet, the light transmittance exceeds 40%, and a predetermined pattern can be seen from both the topsheet side and the backsheet side.

DESCRIPTION OF SYMBOLS 1 Absorbent article 2 Top sheet 3 Back sheet 4 Absorbent sheet 5 Pattern 6 Side sheet 7 Squeeze part 8 Fixing part 9, 9 ', 9''Colored part 10 First surface 10' Surface closest to the top sheet 10 " Surface closest to backsheet 11 Second surface 12 Absorbent core

Claims (7)

An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent sheet between the top sheet and the back sheet,
The absorbent sheet has a first surface having a colored portion, and a second surface on the opposite side of the first surface through which the colored portion of the first surface cannot be seen through,
The absorbent sheet is disposed between the top sheet and the back sheet in a state where the second sheet faces inward and is folded at least once along a fold line,
The colored portion is disposed only on the surface of the absorber closest to the top sheet and the surface closest to the back sheet,
From the top sheet side of the absorbent article, the colored portion disposed on the surface of the absorbent sheet closest to the top sheet is seen through, and from the back sheet side of the absorbent article, The colored portion arranged on the surface closest to the back sheet is seen through,
The absorbent article.   The absorbent article according to claim 1, wherein the absorbent sheet is folded with a second surface inward along two fold lines extending in a substantially longitudinal direction of the absorbent article.   The absorbent article according to claim 1, wherein the absorbent sheet is folded with a second surface inward along a fold line extending in a substantially longitudinal direction of the absorbent article.   The absorbent article as described in any one of Claims 1-3 which further contains the absorption core covered with the said absorption sheet.   The absorptive article according to any one of claims 1 to 4 which is an individual packing type sanitary napkin or a panty liner. An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent core and an absorbent sheet between the top sheet and the back sheet,
The absorbent sheet has a first surface having a colored portion and a second surface opposite to the first surface, and the absorbent sheet faces the second surface inward, and the absorbent core Is disposed between the top sheet and the back sheet in a state of being folded at least twice along at least two folding lines.
The colored portion is disposed only on the surface of the absorber closest to the top sheet and the surface closest to the back sheet,
In the absorbent body, the colored portion of the surface closest to the back sheet from the surface closest to the top sheet cannot be seen through, and the colored portion of the surface closest to the back sheet from the surface closest to the back sheet cannot be seen through. ,
From the top sheet side of the absorbent article, the colored portion disposed on the surface of the absorbent sheet closest to the top sheet is seen through, and from the back sheet side of the absorbent article, The colored portion arranged on the surface closest to the back sheet is seen through,
The absorbent article. It is a manufacturing method of the absorptive article according to any one of claims 1 to 6,
Next steps,
Preparing a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorbent sheet, and an optional absorbent core;
Forming a colored portion on the first surface of the absorbent sheet , wherein the colored portion is disposed only on a surface of the absorber closest to the top sheet and a surface closest to the back sheet. ,
Step of folding the absorbent sheet, if desired, with an absorbent core in between, the second surface facing inward and at least one fold, and the liquid-permeable top sheet and the liquid-impermeable back sheet , A step of bonding the absorbent sheet between them,
Including methods.

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