JP5693273B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article. The present invention particularly 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 low manufacturing costs.

  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 can be seen. The absorbent sheet is divided into a plurality of areas by a fold line, and is folded between the top sheet and the back sheet with the second surface facing inward and folded at least once along the fold line. (I) From the top sheet side of the absorbent article, the colored portion disposed on the first surface of the absorbent sheet closest to the top sheet can be seen through ( ii) The above absorbent article From the backsheet side, the colored portion disposed on the first surface of the region closest to the backsheet of the absorbent sheet can be seen through, and (iii) from the topsheet side of the absorbent article, The colored portion disposed on the first surface of the region of the absorbent sheet closest to the top sheet in the region adjacent to the thickness direction of the absorbent article can be further seen through and / or the absorbent article. From the back sheet side of the absorbent sheet, the colored portion disposed on the first surface of the area adjacent to the absorbent sheet in the thickness direction of the absorbent sheet is more transparent. The present inventors have found that the above-described problems can be solved by the absorbent article having the characteristics, 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 through which the colored portion of the first surface can be seen,
The absorbent sheet is divided into a plurality of areas by a fold line, and is folded between the top sheet and the back sheet with the second surface facing inward and folded at least once along the fold line. Has been placed,
The following (i) to (iii),
(I) From the top sheet side of the absorbent article, the colored portion arranged on the first surface of the region closest to the top sheet of the absorbent sheet can be seen through,
(Ii) From the back sheet side of the absorbent article, the colored portion arranged on the first surface of the absorbent sheet closest to the back sheet can be seen through; and (iii) the absorbent Whether the colored portion disposed on the first surface of the region adjacent to the absorbent article in the thickness direction in the region closest to the top sheet of the absorbent sheet can be further seen from the top sheet side of the article And / or the coloring arranged on the first surface of the region adjacent to the thickness direction of the absorbent article in the region closest to the backsheet of the absorbent sheet from the backsheet side of the absorbent article. The part is more transparent,
The above absorbent article.

[Aspect 2]
The absorbent sheet has a first region and a second region including side edges in the width direction of the absorbent article, a first region, and two folding lines extending in a substantially longitudinal direction of the absorbent article. It is divided into three regions, an intermediate region between the second regions, and folded twice so that the second surface faces inward and the second region is outside the first region. The absorbent article according to aspect 1, wherein the colored portion disposed on the first surface of the first region is further transparent from the topsheet side and / or the backsheet side of the absorbent article.

[Aspect 3]
The aspect 2 in which the colored portion disposed on the first surface of the first region, the second region, and the intermediate region is seen through from the top sheet side and / or the back sheet side of the absorbent article. Absorbent articles.

[Aspect 4]
The absorbent sheet is divided into a first region and a second region by one fold line extending substantially in the longitudinal direction of the absorbent article, and is folded once with the second surface facing inward. And from the top sheet side and / or the back sheet side of the absorbent article, the colored portion disposed on the first surface of the first region and the first surface of the second region. The absorbent article according to aspect 1, wherein the colored portion is visible.

[Aspect 5]
The absorbent article according to any one of aspects 1 to 4, further comprising an absorbent core covered with the absorbent sheet.
[Aspect 6]
The absorbent article according to any one of aspects 1 to 5, wherein the area of the colored portion in each region increases as the area approaches the back sheet.

[Aspect 7]
The absorptive article according to any one of modes 1 to 6, further comprising a colored portion on the second surface.
[Aspect 8]
The absorptive article according to any one of embodiments 1 to 7, which is an individually packaged sanitary napkin or a panty liner.

[Aspect 9]
It is a manufacturing method of the absorptive article according to any one of modes 1-8,
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 in which a predetermined pattern can be seen from both the top sheet side and the back sheet side of the present invention is 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. 2 is a cross-sectional view taken along the line AA of the absorbent article shown in FIG. FIG. 3 is a development view of the absorbent sheet of the absorbent article shown in FIG. FIG. 4 is a front view and a rear view of another embodiment of the absorbent article of the present invention. FIG. 5 is a developed view of an example of an absorbent sheet that can form the pattern of the absorbent article shown in FIG. 4. FIG. 6 is a view showing one embodiment of an absorbent article including the absorbent sheet shown in FIG. 4. FIG. 7 is a front view and a rear view of still another embodiment of the absorbent article of the present invention. FIG. 8 is a developed view of an example of an absorbent sheet that can form the pattern of the absorbent article shown in FIG. 7. FIG. 9 is a view showing one embodiment of an absorbent article including the absorbent sheet shown in FIG. FIG. 10 is a front view and a rear view of still another embodiment of the absorbent article of the present invention. FIG. 11 is a developed view of an example of an absorbent sheet that can form the pattern of the absorbent article shown in FIG. 10. FIG. 12 is a view showing one embodiment of an absorbent article including the absorbent sheet shown in FIG. 11. FIG. 13 is a cross-sectional view corresponding to the AA cross section of FIG. 1 of an absorbent article in which the absorbent sheet is folded in two. FIG. 14 is a development view of the absorbent sheet of the absorbent article shown in FIG. FIG. 15 is a front view and a rear view of the absorbent article shown in FIGS. 13 and 14.

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 2 side and the back sheet 3 side. Moreover, the absorbent article 1 shown by FIG. 1 has the pressing part 7. FIG.

  In the absorbent article 1 shown in FIG. 1, a pattern 5 formed from three concentric ellipses of different sizes and brightness can be seen from the top sheet 2 side, and an elliptic pattern 5 can be seen from the back sheet 3 side. appear.

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 includes colored portions 9 (colored portions 9 ′ of the first region 12, colored portions 9 ″ of the second region 13, and colored portions of the intermediate region 14. 9 ''') and a second surface 11 on the opposite side of the first surface 10 through which the colored portion of the first surface 10 can be seen. It is disposed between the sheet 2 and the back sheet 3.
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.

In the absorbent article 1 shown in FIG. 2, the absorbent sheet 4 has two fold lines (f ₁ -f ₁ and f ₂ -f ₂ shown in FIG. 3) extending in the substantially longitudinal direction of the absorbent article 1. Thus, the three regions of the first region 12 and the second region 13 including the side edges in the width direction of the absorbent article 1 and the intermediate region 14 between the first region 12 and the second region 13 Arranged between the top sheet 2 and the back sheet 3 in a state of being divided and folded twice so that the second surface 11 faces inward and the second region 13 is outside the first region 12 Has been.

In the absorbent article 1 shown in FIG.
(I) From the side of the top sheet 2 of the absorbent article 1, the colored portion 9 ′ ″ disposed on the first surface 10 of the intermediate region 14 that is the region closest to the top sheet of the absorbent sheet 4 is transparent. What you see,
(Ii) From the back sheet 3 side of the absorbent article 1, the colored portion 9 ″ disposed on the first surface 10 of the second region 13, which is the region closest to the back sheet, of the absorbent sheet 4. (Iii) from the side of the top sheet 2 of the absorbent article 1, the colored portion 9 ′ disposed on the first surface 10 of the first region 12 of the absorbent sheet 4, and the absorbent sheet 4, the colored portion 9 '' arranged on the first surface 10 of the second region 13 is further seen through,
Thus, a pattern on the top sheet 2 side of the absorbent article 1 (reference numeral 5 in FIG. 1) and a pattern on the back sheet 3 side of the absorbent article 1 (reference numeral 5 in FIG. 1) are formed.

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 colored portion 9 (consisting of a colored portion 9 ′ in the first region 12, a colored portion 9 ″ in the second region 13, and a colored portion 9 ′ ″ in the intermediate region 14). The surface 10 and the second surface 11 on the opposite side of the first surface 10 through which the colored portion 9 of the first surface 10 can be seen, and the absorbent sheet 4 is an abbreviation of the absorbent article 1. A first region 12 and a second region 13 including side edges in the width direction of the absorbent article 1 by _two folding lines f ₁ -f ₁ and f ₂ -f ₂ extending in the longitudinal direction, It is divided into three regions, an intermediate region 14 between the region 12 and the second region 13.

  In the absorbent sheet 4 shown in FIG. 3, the colored portion 9 ′, the colored portion 9 ″, and the colored portion 9 ′ ″ are all described to have the same lightness. In the embodiment, the colored part 9 ′, the colored part 9 ″, and the colored part 9 ′ ″ may all have different brightness, or the colored part 9 ′, the colored part 9 ″, and the colored part 9 Any two of '' 'may have different brightness.

  In the embodiment shown in FIGS. 1 to 3, as shown in FIG. 3, the colored portion 9 (consisting of the colored portion 9 ′, the colored portion 9 ″, and the colored portion 9 ′ ″) has the same brightness. However, from the top sheet 2 side, it seems that each brightness is different. The reason is that the reflected light reflected by the colored portion 9 ′ ″ passes through the top sheet 2 and is observed by the viewer, but the reflected light reflected by the colored portion 9 ′ is the same as that of the top sheet 2. The light transmitted through the absorption sheet 4 a total of two times, observed by the viewer, and generated from the colored portion 9 ″ is transmitted through the top sheet 2 and the absorption sheet 4 a total of three times. Observed by the viewer. Similarly, from the back sheet 3 side, the reflected light reflected by the colored portion 9 (consisting of the colored portion 9 ′, the colored portion 9 ″, and the colored portion 9 ′ ″) is reflected once from the back sheet 3 once. Or after passing through the absorbent sheet 4 a plurality of times, it is observed by a viewer.

  Since the top sheet, the back sheet, and the absorption sheet each have a specific light transmittance, the reflected light reflected by each colored portion depends on the number of times of passing through the top sheet, the back sheet, and / or the absorption sheet. It is attenuated, and a difference occurs in the brightness of the colored portion seen on the top sheet side and the back sheet side, and as a result, a pattern is formed on the top sheet and / or the back sheet.

  In the present specification, only the brightness is discussed based on the fact that the attached drawings are black and white. However, in actual products, the colored portion is generally a chromatic color and has a chromatic color. Each colored part is also attenuated according to the number of times it passes through the top sheet, back sheet and / or absorbent sheet, resulting in a change in the brightness, hue, saturation, etc. of the colored part seen.

  In FIG. 2, the absorbent sheet 4 is arranged so that the central region 14 faces the top sheet 2 side. However, in another embodiment of the present invention, the absorbent sheet is disposed on the back sheet side. You may arrange | position so that it may face.

  In the absorbent article shown in FIGS. 1 to 3, the pattern on the top sheet side has a function of perceiving high absorption performance, and the pattern on the back sheet side has a function of making it difficult to see absorbed menstrual blood. Have. The absorbent article of the present invention can easily have a pattern having these functions on both the top sheet side and the back sheet side.

  FIG. 4 is a front view and a rear view of another embodiment of the absorbent article of the present invention. 4A is a front view on the top sheet side, and FIG. 4B is a rear view on the back sheet side. The absorbent article 1 shown in FIG. 4 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 2 side and the back sheet 3 side. Moreover, the absorbent article 1 shown in FIG.

  In the absorbent article 1 shown in FIG. 4, a pattern 5 formed from two concentric ellipses having different sizes and brightness can be seen from the top sheet 2 side, and a star shape having different brightness from the back sheet 3 side. The pattern 5 in which the pattern is arranged at the apex of the regular hexagon can be seen.

FIG. 5 is a development view of an example of an absorbent sheet that can form the pattern 5 of the absorbent article 1 shown in FIG. 4. The absorbent sheet 4 shown in FIG. 5 includes a first surface 10 having a colored portion 9 (consisting of a colored portion 9 ′, a colored portion 9 ″, and a colored portion 9 ′ ″) and the first surface 10. The absorbent sheet 4 has two fold lines f ₁ extending in the substantially longitudinal direction of the absorbent article 1. The absorbent sheet 4 has a second surface 11 opposite to the first surface 10 through which the colored portion 9 can be seen. -F ₁ and f ₂ -f ₂ , between the first region 12 and the second region 13 including the side edges in the width direction of the absorbent article 1, and between the first region 12 and the second region 13 It is divided into three areas, the intermediate area 14.

FIG. 6 is a view showing one embodiment of an absorbent article including the absorbent sheet 4 shown in FIG. 5. FIG. 6 is a cross-sectional view of the absorbent article 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, a side sheet 6, an absorbent core 15, and a fixing part to an undergarment. 8 and so on. 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 15 together. In the absorbent article 1 shown in FIG. 6, the absorbent sheet 4 has two fold lines (f ₁ −f ₁ and f ₂ −f ₂ shown in FIG. 5) extending substantially in the longitudinal direction of the absorbent article 1. The second surface 11 faces inward, the absorbent core 15 is sandwiched therebetween, and the second region 13 is folded twice so that the second region 13 is outside the first region 12.
In FIG. 6, the colored portion 9 ′ and the colored portion 9 ″ are also shown that are not originally observed on the AA section in order to help understanding.

In the absorbent article 1 shown in FIG. 6, the absorbent sheet 4 covers the absorbent core 15. In other words, the absorption core 15 divides the first region 12 and the second region 13 from the intermediate region 14. Since the absorbent core usually has a certain thickness and has high hiding power, the colored portion disposed on the first surface 10 of the first region 12 below the absorbent core 15 from the top sheet 2 side. 9 ′ and the colored portion 9 ″ disposed on the first surface 10 of the second region 13 are difficult to see through.
On the other hand, from the back sheet 3 side, the colored portion 9 ′ ″ disposed on the first surface of the intermediate region 14 above the absorbent core 15 is difficult to see through.

Accordingly, in the present invention, the absorbent core can be used not only to increase the absorbent capacity of the absorbent article, but also to conceal the colored portion. Therefore, the absorbent article as shown in FIGS. Not only is it excellent in force, it can have a pattern that differs greatly between the top sheet side and the back sheet side. Therefore, the absorbent article of the present invention including the absorbent core can easily have a pattern that is greatly different between the top sheet side and the back sheet side.
In addition, in order for an absorption core to have sufficient hiding power, it is preferable that an absorption core has the below-mentioned total light transmittance of 40% or less.

  In the embodiment shown in FIGS. 4 to 6, the colored portion 9 ′ disposed on the first surface 10 of the first region 12 can be seen from the top sheet 2 side. The reflected light reflected by the light is transmitted through the absorbing sheet 4 a total of two times (first region 12 and intermediate region 14) while being attenuated, and then transmitted through the top sheet 2 while being attenuated. Must be visible from. Therefore, the absorbent article of the present invention makes it difficult to transmit light by adjusting the light transmittance of the top sheet, the absorbent sheet, etc. The sheet side can have a greatly different pattern, and these are also included in the embodiment of the present invention.

  FIG. 7 is a front view and a rear view of still another embodiment of the absorbent article of the present invention. FIG. 7A is a front view on the top sheet side, and FIG. 7B is a rear view on the back sheet side. 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. A predetermined pattern 5 can be seen from both the top sheet 2 side and the back sheet 3 side. Moreover, the absorbent article 1 shown in FIG.

  The absorbent article 1 shown in FIG. 7 is a pattern formed from a plurality of star-shaped patterns from the top sheet 2 side, and the lightness is lower (darker) at the center in the width direction of the absorbent article 1. A pattern 5 having a star-shaped pattern with lightness of the stage can be seen. On the other hand, it is a pattern formed from a plurality of star-shaped patterns from the back sheet 3 side, and the lightness is higher (thinner) in the center in the width direction of the absorbent article 1 and has a star-shaped pattern with three levels of brightness. Pattern 5 is visible.

FIG. 8 is a development view of an example of an absorbent sheet that can form the pattern of the absorbent article 1 shown in FIG. 7. The absorbent sheet 4 shown in FIG. 8 includes colored portions 9 (colored portions 9 ′ of the first region 12, colored portions 9 ″ of the second region 13, and colored portions 9 ′ ″ of the intermediate region 14). ) And a second surface 11 on the opposite side of the first surface 10 through which the colored portion 9 of the first surface 10 can be seen, and the absorbent sheet 4 absorbs The first region 12 and the second region 13 including the side edges in the width direction of the absorbent article 1 by _two fold lines f ₁ -f ₁ and f ₂ -f ₂ extending substantially in the longitudinal direction of the absorbent article 1 And an intermediate region 14 between the first region 12 and the second region 13.

  In the absorbent sheet 4 shown in FIG. 8, the colored portion 9 ′, the colored portion 9 ″ and the colored portion 9 ′ ″ all have the same brightness, but in another embodiment of the present invention, the colored portion 9 ′, the colored portion 9 ″ and the colored portion 9 ′ ″ may all have different brightness, or among the colored portion 9 ′, the colored portion 9 ″ and the colored portion 9 ′ ″, Any two of them may have different brightness.

FIG. 9 is a view showing one embodiment of an absorbent article including the absorbent sheet 4 shown in FIG. FIG. 9 is a cross-sectional view of the absorbent article 1 shown in FIG.
The absorbent article 1 shown in FIG. 9 includes a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, an absorbent sheet 4, side sheets 6, and a fixing portion 8 for underwear. Moreover, the absorbent article 1 shown by FIG. 9 has the pressing part 7 formed by pressing the top sheet 2, the absorption sheet 4, and the absorption core 15 together. In the absorbent article 1 shown in FIG. 9, the absorbent sheet 4 has two fold lines (f ₁ -f ₁ and f ₂ -f ₂ shown in FIG. 8) extending in the substantially longitudinal direction of the absorbent article 1. 2 is folded twice so that the second surface 11 faces inward and the second region 13 is outside the first region 12.
In FIG. 9, the colored portion 9 ′ and the colored portion 9 ″ are also shown that are not originally observed in the AA cross section in order to help understanding.

  The absorbent article as shown in FIGS. 7 to 9 has a pattern with high designability on both the top sheet side and the back sheet side. The absorbent article of the present invention can easily have such a highly designable pattern on both the top sheet side and the back sheet side of the absorbent article.

  FIG. 10 is a front view and a rear view of still another embodiment of the absorbent article of the present invention. FIG. 10A is a front view on the top sheet side, and FIG. 10B is a rear view on the back sheet side. The absorbent article 1 shown in FIG. 10 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 2 side and the back sheet 3 side. Moreover, the absorbent article 1 shown by FIG.

  In the absorbent article 1 shown in FIG. 10, a pattern formed from two concentric ellipses having different sizes and brightness can be seen from the top sheet 2 side, and the lightness is low (dark) from the back sheet side. You can see marks that represent the front and back of the product, and a pattern that consists of bright (thin) star-shaped patterns.

FIG. 11 is a developed view of an example of an absorbent sheet that can form the pattern of the absorbent article shown in FIG. 10. The absorbent sheet 4 shown in FIG. 11 includes colored portions 9 (colored portions 9 ′ of the first region 12, colored portions 9 ″ of the second region 13, and colored portions 9 ′ ″ of the intermediate region 14). ) And a second surface 11 on the opposite side of the first surface 10 through which the colored portion 9 of the first surface 10 can be seen, and the absorbent sheet 4 absorbs The first region 12 and the second region 13 including the side edges in the width direction of the absorbent article 1 by _two fold lines f ₁ -f ₁ and f ₂ -f ₂ extending substantially in the longitudinal direction of the absorbent article 1 And an intermediate region 14 between the first region 12 and the second region 13.

FIG. 12 is a view showing one embodiment of an absorbent article including the absorbent sheet 4 shown in FIG. 11. FIG. 12 is a cross-sectional view of the absorbent article shown in FIG.
The absorbent article 1 shown in FIG. 12 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. Moreover, the absorbent article 1 shown by FIG. 12 has the pressing part 7 formed by pressing the top sheet 2 and the absorption sheet 4 together. In the absorbent article 1 shown in FIG. 12, the absorbent sheet 4 has two fold lines (f ₁ -f ₁ and f ₂ -f ₂ shown in FIG. 11) extending in the substantially longitudinal direction of the absorbent article 1. 2 is folded twice so that the second surface 11 faces inward and the second region 13 is outside the first region 12.
In FIG. 12, colored portions 9 ′ and 9 ″ are also shown that are not originally observed on the AA section in order to help understanding.

  The absorbent articles shown in FIGS. 10-12 can have low lightness (dark color) important information (such as wearing direction) and high lightness (light color) design. The absorbent article of the present invention can easily have these on both the top sheet side and the back sheet side.

  In this specification, the term “through-through” as used with respect to the absorbent sheet refers to “total” measured according to “Measurement method A” of 5.5.2 of JIS K7105-1981 of the absorbent sheet used in the present invention. "Light transmittance" means greater than 40%.

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 more than 40%, more than 40% of the reflected light reflected by the colored portion of the first surface is transmitted to the second surface side. It is easy to see the colored part on the surface.
The total light transmittance is preferably more than 45%, more preferably more than 50%, so that the colored portion of the first surface can be seen more transparently from the second surface. More preferably, it exceeds 55%.

  The absorbent sheet used in the present invention is not particularly limited as long as printing is possible and the colored portion of the first surface can be seen through the second surface (low concealing power). For example, tissues, spunlace nonwoven fabrics, spunbond nonwoven fabrics, SMS (spunbond / meltblown / spunbond) nonwoven fabrics, SM (spunbond / meltblown) nonwoven fabrics, and the like. Is preferred. Airlaid sheets, air-through nonwoven fabrics and the like are less preferred because they tend to be bulky due to their production methods and the total light transmittance tends to be low.

  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, the finer the fiber, and the higher the proportion of the pigment contained in the fiber, the lower the total light transmittance (the higher the concealment rate).

  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 absorbent article of the present invention, colored portions are arranged in a plurality of regions, and lightness, hue, saturation, and the like are different from a single colored portion using light transmittance and path difference of an absorbing sheet or the like. A pattern can be easily formed.

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 of the absorbing sheet therein, and the human eye is formed by the colored portion. The pattern can be recognized.

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. When the top sheet is a resin film, the thicker the thickness, the higher the proportion of the colorant such as pigment, The light transmittance tends to be low.

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 ratio of the colorant such as a pigment increases.

In the absorbent article of the present invention, the side sheet is an element as desired, and when present, can be formed from the same material 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 the present specification, the absorbent core is an optional element, for example, ground pulp, chemical pulp, cellulose fiber, and artificial cellulose fiber such as rayon and acetate, synthetic fiber, and sheeted products thereof such as airlaid sheet, A through-air nonwoven fabric and the like can be mentioned. 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 the present 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 colored portion can be obtained by printing the absorbent sheet using means such as gravure printing, screen printing, flexographic printing, and the like.

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.

  As described above, the absorbent article of the present invention has been listed in which the absorbent sheet is folded by two fold lines, that is, examples of the tri-fold absorbent sheet. In the present invention, the fold line of the absorbent sheet is listed. The number of folds, that is, the number of times of folding is not particularly limited, and may be a bi-fold absorbent sheet as shown in FIGS.

FIG. 13 is a cross-sectional view corresponding to the AA cross section of FIG. 1 of an absorbent article in which the absorbent sheet is folded in two. In the absorbent article 1 shown in FIG. 13, the absorbent sheet 4 has a colored portion 9 (consisting of a colored portion 9 ′ in the first region 12 and a colored portion 9 ″ in the second region 13). And the second surface 11 on the opposite side of the first surface 10 through which the colored portion of the first surface 10 can be seen, and is disposed between the top sheet 2 and the back sheet 3. ing.
In addition, the absorbent article 1 shown by FIG. 13 has the pressing part 7 formed by pressing the top sheet 2 and the absorption sheet 4 together.

  In the absorbent article 1 shown in FIG. 13, the absorbent sheet 4 is divided into a first area 12 and a second area 13 by one fold line ff extending in the substantially longitudinal direction of the absorbent article 1. In addition, the second surface 11 is folded once with the inner side facing inward, and from the top sheet 2 side and the back sheet 3 side of the absorbent article 1 to the first surface 10 of the first region 12. The colored portion 9 ′ disposed and the colored portion 9 ″ disposed on the first surface 10 of the second region 13 can be seen through.

FIG. 14 is a development view of the absorbent sheet 4 of the absorbent article 1 shown in FIG. The absorbent sheet 4 includes a first surface 10 having a colored portion 9 (consisting of a colored portion 9 ′ in the first region 12 and a colored portion 9 ″ in the second region 13) and the first surface 10. The colored portion 9 is seen through and has a second surface 11 on the opposite side of the first surface 10, and the absorbent sheet 4 has a first fold line ff and the first region 12 and the second surface 11. Two regions 13 are divided into two regions.
In the absorbent sheet shown in FIG. 14, the colored portions 9 ′ and 9 ″ all have the same brightness, but in another embodiment of the present invention, the colored portions 9 ′ and 9 ″ are colored portions. , May have different brightness.

  FIG. 15 is a front view and a rear view of the absorbent article described in FIGS. 13 and 14. FIG. 15A is a front view on the top sheet side, and FIG. 15B is a rear view on the back sheet side. The absorbent article 1 shown in FIG. 15 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 2 side and the back sheet 3 side. Moreover, the absorbent article 1 shown in FIG.

  In the absorbent article 1 shown in FIG. 15, a star-shaped pattern 5 with different brightness can be seen from the top sheet 2 side and the back sheet 3 side.

In still another embodiment of the absorbent article of the present invention, not only the first surface but also the second surface can have a colored portion. When the second surface has the colored portion, a more complicated pattern can be formed. The colored portion on the second surface can be formed by the same method as the colored portion on the first surface.
Moreover, in the absorbent article of this invention, the pattern may be attached | subjected to the top sheet and / or the back sheet. 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 menstrual blood absorbed by a pattern inconspicuous. Napkin and panty liners are preferred.

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.
As an absorbent sheet, a tissue made of 100% softwood pulp having a fiber length of about 2.0 to about 2.8 mm, rayon fibers (1.7 dtex × 40 mm) and polyethylene terephthalate fibers (2.2 dtex × 50 mm). , 60:40 (mass ratio).

  The total light transmittance was measured according to the above-described method 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, ○ means that the colored portion of the first surface was seen through from the second surface, and x means that the colored portion of the first surface was not seen through. .

  From Table 1, when using tissue and spunlace as the absorbent sheet, the total light transmittance exceeds 40% within the range of the basis weight that is normally used, and the colored portion of the first surface is also visually evaluated, It was confirmed to be seen through from the second surface.

[Example 2]
As a typical example of the top sheet, an air-through nonwoven fabric (a composite fiber composed of a polyethylene terephthalate core and a polyethylene sheath, a fiber containing 4% by mass of titanium oxide in the core, fiber diameter: 2.2 dtex, fiber length: 45 mm, (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 and visually evaluated. The total light transmittance was 71.5%. And the result of visual evaluation was (circle).

As a typical example of the back sheet, a breathable back sheet (basis weight 35 g / m ² ) composed of 50% by mass of polyethylene and 50% by mass of calcium carbonate was prepared, and the total light transmittance was measured in the same manner as in Example 1. Then, when visually evaluated, the total light transmittance was 49.3%, and the result of the visual evaluation was ◯.
From the above, it can be seen that with a standard topsheet and backsheet, the total light transmittance exceeds 40%, and a predetermined pattern can be seen from both the topsheet side and the backsheet side.

[Example 3]
[Manufacture of absorbent articles]
As an absorbent sheet, a tissue (basis weight: 14 g / m ² , thickness: about 0.05 mm) made of 100% softwood pulp with a fiber length of about 2.0 to about 2.8 mm is prepared and gravure printed The machine printed three monochromatic blue ellipses as shown in FIG. Next, as a top sheet, an air-through non-woven fabric (core is made of polyethylene terephthalate, sheath is made of polyethylene, and the core contains 4% by mass of titanium oxide, fiber diameter: 2.2 dtex, fiber length: 45 mm, basis weight: 25 g / m ² , thickness: about 0.3 mm), and a breathable back sheet (basis weight: 35 g / m ² ) composed of 50% by mass of polyethylene and 50% by mass of calcium carbonate as a back sheet When the absorbent article having the structure as shown in FIG. 2 was prepared and formed as shown in FIG. 1, the top sheet side was formed from three concentric ellipses having different color densities and sizes. A pattern formed from one ellipse having a single color intensity was observed from 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'',9''' Colored part 10 First surface 11 Second surface 12 1st area | region 13 2nd area | region 14 Middle area | region 15 Absorption core

Claims (9)

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 can be seen.
The absorbent sheet is divided into a plurality of areas by a fold line, and is folded between the top sheet and the back sheet with the second surface facing inward and folded at least once along the fold line. Has been placed,
The following (i) to (iii),
(I) From the top sheet side of the absorbent article, the colored portion disposed on the first surface of the region of the absorbent sheet closest to the top sheet can be seen through.
(Ii) From the back sheet side of the absorbent article, the colored portion disposed on the first surface of the absorbent sheet closest to the back sheet can be seen through; and (iii) the absorbent Whether the colored portion arranged on the first surface of the region adjacent to the absorbent article in the thickness direction in the region closest to the top sheet of the absorbent sheet can be further seen from the top sheet side of the article And / or the coloring arranged on the first surface of the region adjacent to the thickness direction of the absorbent article in the region closest to the backsheet of the absorbent sheet from the backsheet side of the absorbent article. The part is more transparent,
The said absorbent article characterized by these.   The absorbent sheet has a first region and a second region including a side edge in the width direction of the absorbent article, a first region, and two folding lines extending in a substantially longitudinal direction of the absorbent article. It is divided into three regions, an intermediate region between the second regions, and folded twice so that the second surface faces inward and the second region is outside the first region. The absorbent article according to claim 1, wherein the colored portion disposed on the first surface of the first region is further transparent from the topsheet side and / or the backsheet side of the absorbent article. .   The colored portion disposed on the first surface in the first region, the second region, and the intermediate region is seen through from the top sheet side and / or the back sheet side of the absorbent article. Absorbent article as described in 1.   The absorbent sheet is divided into a first region and a second region by one fold line extending substantially in the longitudinal direction of the absorbent article, and is folded once with the second surface facing inward. And from the top sheet side and / or the back sheet side of the absorbent article, the colored portion disposed on the first surface of the first region and the first surface of the second region. The absorbent article according to claim 1, wherein the colored portion is visible.   The absorptive article according to any one of claims 1 to 4 which further contains an absorption core covered with said absorption sheet.   The absorbent article as described in any one of Claims 1-5 with which the area of the said coloring part in each area | region becomes large, so that it approaches a back seat | sheet.   The absorptive article according to any one of claims 1 to 6 which further has a coloring part on the 2nd surface.   The absorptive article according to any one of claims 1 to 7 which is an individual packing type sanitary napkin or a panty liner. It is a manufacturing method of an absorptive article according to any one of claims 1 to 8,
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, 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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