JP4322180B2 - Absorbent articles - Google Patents

Description

  The present invention relates to absorbent articles such as orimono sheets and incontinence pads.

When excrement (body fluid) such as orientation and urine is transparent or light-colored, the absorbent article visually recognizes how much the body fluid is absorbed or how much the absorbed body fluid spreads from the absorption surface side. It was difficult. For this reason, it was difficult to judge the replacement with a new absorbent article. On the other hand, depending on the color state and the mass state of the body fluid, the absorption state looks dirty, which is uncomfortable for the user.

Patent Document 1 below proposes a pattern printed on a back sheet of an absorbent article. However, this absorbent article is merely used to relieve discomfort during use. In addition, Patent Document 2 below proposes a product that is colored so that a predetermined color difference is generated between the surface sheet of the absorbent article and the absorbent core. It makes it easy to confirm the position of the absorbent core from the side and improves the aesthetics. Patent Document 3 below proposes an absorbent article in which the surface sheet is colored in a predetermined manner to color the entire product. However, in this absorbent article, the main object is to make it difficult to see the spread of things. It has been placed.

International Publication No. 2004/006818 Pamphlet Japanese Patent Laid-Open No. 11-299825 JP 2004-130056 A

Accordingly, the present invention has been made in view of the above-described problems, and an absorbent article that can easily determine whether or not to replace an absorbent article and can reduce discomfort due to dirt associated with body fluid absorption. The purpose is to provide.

The present invention has a skin contact layer and a colored layer, and absorbs body fluid so that the visibility of the colored layer viewed from the skin contact surface side is higher than that before the body fluid is absorbed. The object is achieved by providing an article.

According to the absorbent article of the present invention, since the spread of the liquid due to the absorption of body fluid can be easily recognized, the replacement can be easily determined. Further, by making the color of the body fluid inconspicuous by the colored layer, it is possible to reduce the discomfort due to the dirt accompanying absorption of the body fluid.

Hereinafter, an absorptive article of the present invention is explained based on a desirable embodiment, referring to drawings.

FIG. 1 schematically shows a first embodiment in which an absorbent article of the present invention is applied to a panty liner used by being attached to underwear such as shorts. In FIG. 1, the code | symbol 1 has shown the absorbent article.

As shown in FIG. 1, the absorbent article 1 of the present embodiment has a skin contact layer 2 that transmits and absorbs body fluid from the skin contact surface 20, and a leak-proof layer that prevents leakage of absorbed body fluid. 3 is provided. In the absorbent article 1 of the present embodiment, the leak-proof layer 3 is a colored layer that is colored as described later.

When the absorbent article 1 absorbs the body fluid, the visibility of the colored layer as seen from the skin contact surface 20 side of the skin contact layer 2 of the body fluid, that is, the leakage-preventing layer 3 is higher than before absorption. Is provided. Here, the visibility of the colored layer as seen from the skin contact surface 20 side of the skin contact layer 2 is higher than that before the liquid absorption. The absorption of the liquid absorption part in the skin contact layer 2 is accompanied by the absorption of the body fluid. It means that the coloring increases and the coloring can be recognized more clearly than before the liquid absorption.

The evaluation index of the change in visibility before and after the liquid absorption of the absorbent article 1 includes the difference in lightness before and after the liquid absorption of all the layers on the skin side of the colored layer of the absorbent article 1, particularly the back black color before and after the liquid absorption. It is preferable to use the difference in brightness LB. The difference (decrease) in the back black lightness LB is 7 to 3 compared to before the liquid absorption.
It is preferably 0, particularly 10-30.

Here, the back black lightness LB refers to the lightness L value indicated by the sheet with the standard black plate on the back,
The smaller the value is in the range of 0 to 100, and the closer to the L value of the standard black plate, the higher the transparency of the sheet. In general, it means that the lower the back black lightness LB is, the blacker the sheet is, and the surface includes a black sheet. The background black lightness LB can be measured by using a commercially available color difference meter, for example, a color difference meter “SE2000” manufactured by Nippon Denshoku Industries Co., Ltd. and an attached standard black plate (L value = 7). . In the present embodiment, the background black lightness LB is measured by peeling the colored layer and below and measuring the entire upper layer (skin side). Therefore, as will be described later, when there is an absorbent layer below the skin contact layer and there is a colored leak-proof layer below the skin contact layer, the skin contact layer including the absorption layer is measured. When the absorption layer is a colored layer, the measurement is performed only with the skin contact layer.

The degree of difference (decrease) in the LB value before and after the liquid absorption varies depending on the material design of the entire layer on the skin side from the colored layer, the amount of absorbed liquid, the color of the liquid, and the way the liquid spreads. Therefore, the measurement of the LB value assumes a viscous liquid such as a cage in the case of an absorbent article like this embodiment,
Inject 0.5 mL of glycerin into the skin contact layer 2 using a disposable syringe (no needle, plastic syringe 2-5630-04 with a scale made by ASONE) (press the tip of the syringe at one point and inject in about 10 seconds) It is preferable to measure the LB value after 1 minute. The LB value at this time is preferably 40 to 100, and particularly preferably 50 to 90, in consideration of absorption retention of the liquid. In addition, the design of the LB value after liquid absorption is relative, and the transparency is increased compared to before liquid absorption, and the color of the standard black plate behind can be seen through (that is, the LB value is higher than before liquid absorption). It is meaningful to decrease.

The difference in the back black lightness LB of the skin contact surface 20 before and after liquid absorption of the absorbent article 1 is preferably 2 to 50, particularly 5 to 30. By setting the difference in the lightness LB within such a range, the above-described coloring visibility is improved within a specific range in which the body fluid is absorbed as described above, so that how much the body fluid is absorbed or the absorbed body fluid is reduced. The extent of the spread can be reliably recognized from the skin contact surface 20 side.
The back black lightness LB of the skin contact surface 20 before liquid absorption is generally designed to be white on the surface side in absorbent articles, and therefore, fiber aggregates (preferably air-through nonwoven fabric) such as 70 to 100, particularly nonwoven fabrics.
When it is comprised, it is preferable to set it as 75-95. Here, the reason why the material does not become completely white (lightness LB = 100) due to the difference in material is that, in the case of the nonwoven fabric, there is a gap between the fibers and there is some transparency, so that the black color of the formation is somewhat transparent. Further, the back black lightness LB of the skin contact surface after liquid absorption is lowered because the transparency of the material is improved by liquid absorption and the black behind is visible.

As described above, the skin contact layer 2 has the permeability of the body fluid and the retention of the permeated body fluid, and the coloring applied to the leak-proof layer 3 from the liquid absorption portion with the absorption of the body fluid is the skin. It is a layer having light transmissivity so that it can be more visually recognized from the contact surface 20 side. The skin contact layer 2 having such a function is a single-layer sheet or a multi-layer (laminated) sheet made of a fiber assembly (non-woven fabric or web-like material that is not made of non-woven fabric), or a single layer or It is comprised by what laminated | stacked the transparent apertured film on the surface of a multilayer sheet.

As the fibers themselves of the fiber aggregate forming the skin contact layer 2, those that are essentially transparent are used unless a colorant is internally added.
However, even when such fibers are gathered together, the refractive index of the fibers and the air interposed between them is different, so that light is irregularly reflected and scattered on the fiber surface. For this reason, the fiber aggregate appears white and cloudy as a whole. When such a fiber assembly absorbs moisture and the fiber gap is completely filled with water, the refractive index of water and fiber is close to each other, so that the entire structure is transparent without light scattering.
The present inventors paid attention to the transparency of such a skin contact layer (or an absorption layer described later) by liquid absorption. And in order to effectively make the skin contact layer 2 (or an absorption layer described later) transparent when the liquid is sucked, the fiber aggregate constituting the skin contact layer 2 (or an absorption layer described later) 1) The entire fiber assembly has a particularly narrow space between the fibers and is easily filled with the liquid. 2) The fiber assembly has a portion where the distance between the fibers is locally narrow and is easily filled with the liquid. 3) Fibers. It is important that the whole or a part of the aggregate is provided with a special device that narrows the space between fibers when the liquid is sucked and is easily filled with the liquid. By applying such a device, a difference occurs in the back black brightness LB before and after the liquid absorption as described above, and a preferable form is found in which the visibility of the color viewed from the skin contact surface side is higher than before the absorption of the body fluid. It was.

Examples of fibers constituting the fiber assembly of the skin contact layer 2 include, for example, polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, polyester / polyethylene composite fibers, polypropylene / polyethylene composite fibers, and polyamides such as nylon. Examples thereof include fibers or a combination of these. In addition, rayon, viscose fiber, and polyvinyl alcohol (PVA) fiber have high surface hydrophilicity and absorbency, and when they are wet, the elasticity of the fiber is reduced and the fiber aggregate is easily transparent. Can be made.

The fibers constituting the fiber assembly may contain a colorant as long as the color visibility after liquid absorption is not impaired. In order to sufficiently improve the transparency at the time of liquid absorption, the blending ratio of the colorant is preferably 2% by mass or less, and particularly preferably 0.5% by mass or less. Examples of the colorant include titanium oxide (TiO ₂ ), calcium carbonate (CaCO ₃ ), barium sulfate (BaSO ₄ ), and the like. Among these, titanium oxide is preferable because the whiteness of the fiber assembly can be increased and high shielding power is exhibited. The content of titanium oxide is preferably 2% by mass or less, particularly preferably 1% by mass or less.

When a nonwoven fabric is used as the fiber assembly of the skin contact layer 2, a nonwoven fabric produced by a production method such as a spunbond method, an air-through method, or a heat roll method can be used. In particular, the nonwoven fabric manufactured by the air-through method is desirable from the viewpoint of the flexibility of the nonwoven fabric and the touch feeling, and a nonwoven fabric with increased transparency using a heat roll method can also be used.

As another preferable form of the fiber assembly constituting the skin contact layer 2, the skin contact surface 20 side has a second fiber layer (fiber assembly) in which fibers are heat-sealed, and non-skin contact A composite structure non-woven fabric (composite fiber assembly) having a second fiber layer (fiber assembly) in a loosely bonded state that contains non-heat-sealable fibers on the surface side and is not so fused between the fibers. It is done. The composite structure non-woven fabric has a gentle structure in which the fibers on the non-skin contact surface side are likely to change. Therefore, when wet by liquid absorption, the composite structure non-woven fabric easily collects moisture between fibers. That is, the thickness of the layer itself tends to decrease while getting wet. As a result, the space between the fibers is filled with moisture, and the entire skin contact layer 2 tends to be transparent.
This composite structure nonwoven fabric includes a heat-fusible fiber web (first fiber layer) and non-heat-fusible fibers (hereinafter also referred to as non-heat-fusible fibers) or the heat-fusible fibers. A fiber web (second fiber layer) containing a large amount of thermoplastic resin fibers having a higher heat fusion temperature than that of the web can be superposed and bonded with hot air. The heat-fusible fiber web is on the skin contact surface 20 side. When a thermoplastic resin fiber having a high heat fusion temperature is used, the fiber is treated with hot air having a temperature lower than the heat fusion temperature of the fiber. The non-heat-sealable fiber or the thermoplastic resin fiber having a heat-seal temperature higher than that of the heat-sealable fiber web is 40% by mass of the fiber as a layer on the non-skin contact surface side.
It is preferable to make it contain above, and 50 mass% or more is still more preferable.
Specifically, the composite structure non-woven fabric uses a fiber assembly mainly composed of polyester / polyethylene composite fiber or polypropylene / polyethylene composite fiber on the skin contact surface side. Also, on the non-skin contact surface side, a fiber assembly mainly composed of non-heat-bondable fibers such as rayon and viscose fiber, or a fiber assembly mainly composed of polyester or polypropylene fiber having a high heat-sealing temperature Formed using the body. The hot air temperature used for fiber bonding of the nonwoven fabric is selected from a temperature range around 110 ° C. at which the polyester or polypropylene fiber is not melted. The blending ratio of the fibers on the non-skin contact surface side to the skin contact surface side is preferably at least 60% by mass, and the basis weight of each layer is 10 to 8%.
0 g / m ² is preferable, and the basis weight of the entire skin contact layer is more preferably ²⁰ to 150 g / m ^2.
More preferably, it is in the range of ˜100 g / m ² . In particular, the ratio of the layer on the non-skin contact surface side is preferably higher than the layer on the skin contact surface side.

The heat-fused fiber assembly on the skin contact surface side functions as a layer for ensuring the strength of the entire skin contact surface layer 2 and separating the skin and moisture. Accordingly, since the layer on the non-skin contact surface side functions mainly for the transparency, the effect of the transparency is higher when the ratio of the layer on the skin contact surface side is 50% or less.
As described above, the fiber to be used is preferably a substantially transparent fiber on either the skin contact surface side or the non-skin contact surface side. Moreover, it is preferable to mix non-heat-sealable fibers such as rayon and viscose fibers and PVA fibers as the fibers on the non-skin contact side.

Another preferred form of the skin contact layer 2 is a form in which the skin contact layer 2 containing the essentially transparent fiber is embossed. The embossing applied to this skin contact layer 2 is
As shown in FIG. 2A, when the liquid absorbency of the embossed portion (star-shaped portion, hereinafter also referred to as an embossed portion) 21 is higher than that of the surrounding portion 22 (hereinafter referred to as “the embossed portion”). , Called high embossing processing), that is, when the liquid is sucked (because the liquid gathers in the embossed part and the embossed part is transparent), as shown in FIG.
On the contrary, when the liquid absorbency of the embossed portion 21 is made lower than that of the surrounding portion 22 (hereinafter referred to as low absorption embossing), that is, when the liquid is sucked (the liquid enters the embossed portion). Because there is no embossed part only, the coloring below is conspicuous in parts other than the embossed part,
It can be divided into the case where only the embossed part appears white.
As a result of the embossing being moderately embossed, the high absorption embossing increases the capillary force due to the densification of the embossed portion, thereby increasing the absorbency. The low-absorption embossing is to reduce the absorbability of the embossed part by forming a film of the embossed part by strong embossing. By making the embossed part stand out like this,
It is possible to reduce discomfort when the user confirms the liquid absorption state, and to positively improve the appearance impression.

Which embossing is performed is selected mainly according to the target visual effect. For example, when it is desired to make the embossed portion stand out deeply, the embossing conditions of the skin contact layer 2 are adjusted so that the embossed portion does not become a film, and the capillary force is increased. On the other hand, in order to make the embossed part stand out, the embossing conditions are strengthened and the embossed part is made into a film. In addition, it is selected according to the material of the skin contact layer 2. For example, when a non-woven material (such as cotton or rayon spunlace nonwoven fabric) that does not have heat fusion is used for a part of the skin contact layer, the embossed portion becomes a film regardless of the embossing conditions. Therefore, the high absorption embossing can be obtained.

In either case, by adopting a fine, discrete pattern as the embossed pattern, the skin contact layer 2 is fixed in a predetermined pattern, and the fiber gap of the entire skin contact layer 2 can be narrowed. It becomes easy to fill between the fibers with moisture.
The embossing pattern formed by the embossing is the skin contact layer 2 of the embossed part.
The total occupied area ratio on the surface is preferably 5 to 60%, particularly preferably 10 to 40%, considering the absorbability of body fluid, the appearance impression, the texture, the wearing feeling, and the like. The embossed portion may be a so-called “solid” in which the entire portion is crushed, or may be a so-called “outline” in which a non-embossed portion is left by embossing in a linear shape. Moreover, it is preferable that the area of each embossing pattern is 1-25 mm < ² > from a viewpoint which can recognize a pattern clearly and maintains absorptivity. In embossing, it is preferable that the embossing pattern is scattered over substantially the entire surface of the skin contact layer 2 in order to impart moderate flexibility to the absorbent article 1. Further, from the viewpoint of eliminating the influence of air particularly in the excretion spot portion, it is preferable that embossing is particularly concentrated on the substantially central portion of the product. As the form of each emboss pattern, in addition to the star shape as in this embodiment, various geometric shapes such as circles, triangles and other polygons, floral patterns and various patterns, non-lines such as straight lines and curves, etc. Examples include closed patterns and letters.

In order to enhance the effect of filling the space between the fibers with the liquid, the skin contact layer 2 can be mixed with fibers having a small fiber diameter. The thickness of the fiber to be mixed is preferably 2.2 dt or less, and further 1.8 d.
t or less is preferable.
In addition, in order to fill the vicinity of the embossed portion with fine fibers, it is also effective to make the skin contact layer 2 transparent after liquid absorption. In this case, preferable split fibers include fibers made of a combination of two resins having no compatibility, such as polypropylene / polyester and polypropylene / polyethylene. The blending ratio of the split fibers to the skin contact layer is
Preferably it is 5 mass% or more, More preferably, it is 7 mass%-30 mass%.
In the case of these embodiments, the peripheral portion of the embossed portion and the embossed portion (depending on the embossed pattern) are particularly dense portions between the fibers. Accordingly, since the space between the fibers is filled with the liquid around the embossed portion and its vicinity, it becomes transparent as a whole.

In order to improve the absorption retention performance, it is preferable to further dispose an absorption layer below the skin contact layer 2 (on the non-skin contact surface side). As the absorbent layer, for example, the same layer as the above-described skin contact layer 2 can be used. The absorbent layer can be embossed in order to improve transparency due to liquid absorption. In this case, it is preferable that the skin contact layer 2 and the absorbent layer are integrally embossed.

Moreover, as a preferable form of the said absorption layer, the fiber web or nonwoven fabric which mix | blended the non-heat-fusion fiber, especially polyester fiber, rayon fiber, acetate fiber, or these combination is mention | raise | lifted. Because such fiber webs and nonwoven fabrics have many unbonded fibers,
The fiber gap is wide. For this reason, a large amount of air is contained between the fibers before the liquid absorption, and it appears white. After the liquid absorption, the narrow fiber gap in which the fibers are easy to move is filled with the liquid and becomes transparent.
In this case, since the capillary force of the wet part becomes strong, the liquid does not move any more and the liquid becomes stable and transparent.
In order to sufficiently exhibit such an effect, it is preferable to contain the non-heat-fusible fiber in the absorbent layer in an amount of 40% by mass or more, preferably 50% by mass or more. Further, the thickness of the non-heat-bondable fiber is preferably 2.2 dt or less, and particularly preferably 1.8 dt or less so that it can be easily wet-deformed. Furthermore,
It is preferable that the non-heat-bondable fiber is an extremely short staple of 10 mm or less because it easily moves when wet.
On the other hand, when the non-heat-bondable fiber is an extremely long staple or tow of 100 mm or more, the fiber is easily oriented in the flow direction of the nonwoven fabric, and the fiber gap is easily crushed when wet. .
As described above, when a fiber assembly that promotes a special structural change when wet is used for the absorbent layer, the thickness change due to the liquid absorption is large, and the effect of improving the transparency is added. Specifically, the absorbent layer containing the non-heat-fusible fiber absorbs the same amount of water as its own weight, pressurizes at 5 g / cm ² for 10 seconds, and the thickness change rate immediately after releasing the pressure is 40% or more. It becomes.
The non-woven fabric is most preferably arranged separately as a part of the absorbent layer from the standpoint of the effect. However, as another embodiment that is easy to process by increasing the material strength, the non-thermal fusion It is also effective to use a non-woven fabric in which a first layer that does not contain a large amount of conductive fibers and a second layer that contains a large amount of the non-heat-bondable fibers are integrally formed. Such a non-woven fabric is a non-woven fabric manufacturing process in which fibers are laminated in a first layer containing almost (or no) the non-heat-sealable fiber and the non-heat-sealable fiber in the second layer. On the other hand, it can be manufactured by superimposing a second layer containing 40% by mass or more and further applying hot air treatment to bond these layers together.
In such a nonwoven fabric, a sufficiently strong surface strength can be obtained, so that it is possible to form an absorption layer with only one nonwoven fabric. It is also possible to further enhance the effect of transparency by combining the nonwoven fabric and the embossing.

The absorbent layer 2 can contain an absorbent such as pulp or absorbent polymer as long as the visibility of the coloring after liquid absorption is not impaired.

The fiber aggregate constituting the skin contact layer 2 is preferably subjected to a hydrophilic treatment from the viewpoint of improving absorbability. Applying a hydrophilization treatment to the fiber assembly is preferable in order to absorb a small amount of bodily fluids quickly and without leaving any bodily fluids, as in the case of orimono, to give a light feeling of use. In particular, when the skin contact layer 2 is composed of a single-layer sheet of a fiber assembly, the sheet has a structure in which body fluid easily moves from the skin contact surface side to the back surface side (non-skin contact surface side). It is preferable. Such a structure is realized by increasing the capillary force on the skin contact surface side compared to the capillary force on the back surface side. (1) The fibers on the back surface side are the fibers on the skin contact surface side. It is embodied by a configuration in which it is more strongly hydrophilized, (2) the fiber on the back surface side is made thinner than the fiber on the skin contact surface side, and the like. As a specific method for producing a fiber assembly having such a structure, for example, when the fiber assembly is a non-woven fabric, in the formation process, a fiber web is previously stacked in two layers. In the above (1), the back side fiber is treated with a strongly hydrophilic hydrophilizing agent, or the amount of the hydrophilizing agent attached to the back side fiber is increased, and the above (2) In that case, the fiber used for the fiber web on the back side is made thin.

When the skin contact layer 2 is provided as a multilayer sheet, the sheets are joined together using a hot melt adhesive, heat sealing or ultrasonic sealing, or a combination thereof. For the application of the hot melt adhesive, a coating pattern such as spiral spray, multi-row bead, slot spray or thin film coating is used. Further, as will be described later, it is more preferable to improve the adhesion of the nonwoven fabric by using a heat seal (emboss) in combination. The coating amount of the adhesive is preferably ³ to 15 g / m ² from the viewpoint of maintaining a balance between securing a sufficient bonding force between the sheets and ensuring light transmittance between the sheets.

Examples of the hot melt adhesive include styrene-butadiene-styrene (SBS) -based, styrene-ethylene-butadiene-styrene (SEBS) -based, and olefin-based hot melt adhesives. In the hot melt adhesive, the content of the colorant is preferably 0.5% by mass or less for the same reason as described above.

The leak-proof layer 3 is a colored leak-proof sheet. The leak-proof layer 3 may be a single sheet or a composite sheet. Preferable forms include a single film, a laminate of a film and a nonwoven fabric (a nonwoven fabric is present on the clothing side), a combination of a plurality of water-repellent nonwoven fabrics, for example, a plurality of spunbond nonwoven fabric (S) / melt blown nonwoven fabric (M) Combination (SM
, SMS, SMMS, etc.).
The coloring of the leak-proof layer may be applied to any layer constituting the leak-proof layer. The most effective form of the leak-proof layer is a form of a single film colored by kneading a predetermined colorant. A composite sheet in which the film and the nonwoven fabric are laminated can also be suitably used. Although the color developability is inferior to that of such a film or composite sheet, it is possible to color the non-woven fabric forming the constituent member of the leak-proof layer with a colorant or printing.

As another embodiment, the colored layer can be formed as a part of the absorption layer.
For example, the skin contact layer 2 and the absorbent layer may be made transparent as described above, and a colored (hydrophilic) non-woven fabric may be disposed on the lowermost layer of the absorbent layer to form a part of the absorbent body. Is possible. In particular, as the hydrophilic colored non-woven fabric, as described above, when colored fibers are used as part of the non-woven fabric fibers containing a non-heat-fusible fiber and the gap between the fibers becomes narrow, the fibers gather together when wet. Since the color becomes darker, the color can be easily identified and is more effective. Moreover, when the above-mentioned embossing is performed and the colored absorption layer and the skin contact surface layer 2 are integrated, it is more effective for the visibility of the colored layer by liquid absorption.

Coloring is preferably selected from similar color tones that have the effect of reducing the color tone of the liquid to be absorbed, from the viewpoint of reducing the impression of smudged liquid. For example, when sweat, vaginal discharge, and urine are targeted, since the color tone of the target liquid is transparent to yellow, it is preferable to select the color from yellow to light yellow or light green. On the other hand, from the viewpoint of distinguishability of the liquid absorption region, it is also preferable to select from a strong color tone or an opposite color. Specifically, the coloring is preferably selected from light red, pink, and light blue. Furthermore, from the viewpoint of distinguishing the liquid-absorbed region and preventing the color of the cage from appearing too dirty, it is preferable to select a vivid color tone, specifically, pink and a relatively dark blue are preferable.

When the leak-proof layer 3 is composed of a film, it is selected from a thermoplastic resin such as polyethylene, polyvinyl acetate, or a polyolefin resin such as an ethylene-vinyl acetate copolymer or a polyethylene-polyvinyl acetate composite film. The basis weight per film is 15-50g
/ M ² , and the thickness per film is preferably 0.05 to 0.4 mm.

In the leak-proof layer 3, a colorant that imparts the lightness is blended in the film itself. The blending amount of the preferred colorant is 0.2 to 10% by mass, preferably 0.5 to 10% by mass.

On the other hand, in order to give moisture-proof property to the leak-proof layer 3 and to obtain a light wearing feeling, it is also preferable to add a different colorant to make it moisture-permeable. Specifically, an inorganic powder (colorant) such as incompatible calcium carbonate (CaCO ₃ ) is dispersed in a large amount in a film that forms at least a part of the leak-proof layer, and the base film is stretched to obtain a fine film. Peeling (holes) can be formed, and the fine holes can be used as water vapor discharge holes. At this time, a preferable blending amount of the inorganic powder is 30 to 60% by mass, and a preferable total amount combined with the colorant is 30.2 to 60% by mass. The moisture permeability of the leak-proof layer 3 is 1.5 to 3.0 g / (100 cm ² · 24 hr), particularly 1.7 to 2.1 in consideration of both high moisture permeability and prevention of liquid seepage. 2 g / (100 cm ² · 24 hr) is preferable.

In addition to the leak-proof layer, the absorption layer or a part thereof may be colored to give an impression improving effect that does not make the liquid absorption look dirty. As a specific preferred form, when the absorption layer is formed of a plurality of layers, the lowermost layer in contact with the leak-proof layer (for example, fibers of a fiber assembly such as a nonwoven fabric)
The form which mix | blends the coloring agent of a predetermined | prescribed color tone is mentioned. The color tone at this time can be reinforced with the same color tone as the leak-proof layer. On the other hand, it is also possible to select a color different from the color of the leak-proof layer and make a different color tone appear three-dimensionally in combination. In the case of the embodiment in which a pattern is printed on the leak-proof layer at this time, the printed pattern can be seen behind the coloring of the nonwoven fabric, and a three-dimensional visual impression can be obtained, which is effective.
In this case, the LB value before liquid absorption changes depending on the color tone and degree of coloring of the lowermost layer, but the difference in the back black lightness LB of the absorption layer before and after liquid absorption may be in the range of 7 to 30 as described above. preferable.

The leak-proof layer 3 and the skin contact layer 2 are joined in the same manner as in the case where the skin contact layer 2 is provided as a multilayer sheet.

An adhesive (not shown) is attached to the outer surface of the leak-proof layer 3 to be attached to clothes. The adhesive is covered with release paper before use.

The total thickness of the absorbent article 1 is preferably 0.5 to 5 mm in consideration of cushion feeling (softness), absorption capacity securing, uncomfortable feeling at the time of wearing, and the like, and preferably 0.6 to 2 mm. More preferably. The thickness of the absorbent article 1 is 2.5 g / in with a peacock thickness gauge.
It is a value measured with a load of cm ² .

As described above, the absorbent article 1 of the present embodiment is such that the coloring applied to the leak-proof layer 3 from the liquid-absorbing portion with the absorption of body fluid can be more visually recognized from the skin contact surface 20 side. Therefore, the liquid absorption part from the skin contact surface side can be easily recognized. Therefore, the replacement can be easily determined. In addition, the coloring can reduce discomfort caused by dirt accompanying absorption of body fluids. Furthermore, by performing embossing as described above, it is possible to visually recognize the embossed pattern as a result of absorption of body fluid, so that the visual impression at the time of liquid absorption can be positively improved.

The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit of the present invention.

In the present invention, as in the absorbent article 1 of the above-described embodiment, the film itself constituting the leak-proof layer 3 is preferably colored by blending a colorant that imparts the lightness. The lightness may be imparted by applying a paint to the surface of the film constituting the film.

In addition to the leak-proof layer, the absorbent article of the present invention can also color the absorbent layer as described above. Further, in the absorbent article of the present invention, the absorbent article and the leak-proof layer, in which a sheet such as colored paper is interposed in a range not impairing these functions, or in sanitary napkins The thing which colored the surface by the side of the skin contacting surface of the covering paper which coat | covers the surface of a property main body is also contained.

  Further, the leak-proof layer may not be colored, and only the absorption layer may be colored.

The present invention includes panty liners, incontinence pads, sweat pads (eg for armpits and collars),
The present invention can be applied to absorbent articles such as disposable diapers, sanitary napkins and insoles, as well as absorbent articles used by attaching to clothing such as shorts and blouse such as breast milk pads.

It is a figure which shows typically one Embodiment applied to the panty liner of the absorbent article of this invention, (a) is a perspective view, (b) is A-A 'arrow sectional drawing in (a). (A) And (b) is the perspective view which showed typically the change of the visibility after liquid absorption in the panty liner of the said embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Absorbent article 2 Skin contact layer 20 Skin contact surface 21 Embossed part 3 Leak-proof layer (colored layer)

Claims (8)

It has a skin contact layer and a colored layer, and is provided so that the visibility of the colored layer as seen from the skin contact surface side when absorbing bodily fluid is higher than before absorption of bodily fluid ,
The skin contact layer is composed of substantially transparent fibers, and is an absorbent article that is an opaque or translucent fiber assembly before liquid absorption .   The absorbent article according to claim 1, wherein a difference in lightness LB before and after liquid absorption of all layers on the skin side from the colored layer is 7 to 30.   The skin contact layer has a first layer in which heat-sealable fibers are bonded to the skin-contact surface side, and non-heat-sealable fibers on the non-skin contact surface side. The absorbent article according to claim 1, comprising a composite fiber assembly having a second fiber layer in which the fibers are entangled without being joined. The absorbent article of claim 1, wherein the embossing is applied to the skin contact layer. The absorbent article according to claim 4, wherein an absorbent layer is disposed below the skin contact layer, and the embossing is integrally performed on these layers. The absorbent article according to claim 5, wherein the skin contact layer and / or the absorbent layer contains split fibers. The absorbent article according to any one of claims 1 to 6 , wherein the colored layer has leak-proof properties. The absorbent article according to any one of claims 1 to 7 having the colored layer between the layer and the skin contact layer having leakproofness.

Images