JP2011130798A - Absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorbent article permitting easy position adjustment when the article is worn by making the color of a rear surface sheet visible from a skin abutting surface side. <P>SOLUTION: The absorbent article 1 includes: a front surface sheet 2 which forms the skin abutting surface; the rear surface sheet 3 which forms a non-skin abutting surface; and a liquid-retaining absorbent core 4 interposed between the sheets 2 and 3. The absorbent core 4 includes a plurality of independent absorbing members 40. Two or more absorbing members 40 are disposed at prescribed intervals at least in one direction, and a gap 41 is formed between adjacent absorbing members 40 and 40 to extend in the longitudinal direction of the article. The gaps 41 are present at least in a central region in the lateral direction of the absorbent article 1. The color of the rear surface sheet 3 is visible through the gaps 41 from the skin abutting surface side of the absorbent article 1. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an absorbent article such as a sanitary napkin, a disposable diaper, a panty liner (cage sheet), an incontinence pad, and the like.

  As an absorbent article such as a sanitary napkin, a vertically long article is known which includes a top sheet, a back sheet, and a liquid-retaining absorbent disposed between both sheets. Moreover, in the absorbent article having such a configuration, for the purpose of improving the wearability and the like, there is no absorber in the existence area of the absorbent body (the central area of the absorbent article) or the thickness of the absorbent body is reduced. It is known to form a thin portion (see, for example, Patent Document 1).

  In addition, it is known that a predetermined portion of the absorbent article is provided with colors and designs that can be visually recognized from the outside by printing or the like. For example, in Patent Document 2, a part of the topsheet or the absorbent core or the insert disposed between the topsheet and the absorber is colored, and the colored portion has at least two different colors. And the absorptive article visible from the surface sheet side is indicated. According to the absorbent article described in Patent Document 2, when the user looks at the surface sheet side of the absorbent article, the color tone of the colored portion acts to create a perception of depth in the absorbent article. As a result, the secretion is pulled deep inside the absorbent article and away from the user's body, so that the user can feel secure before and during use of the absorbent article. ing.

  Moreover, in patent document 3, the skin contact surface side (opposite surface side with respect to an absorber) or the non-skin contact surface side of a surface sheet (outside area | region located outside the periphery of an absorber) The printed graphic (symbol or character, or an image or design composed of at least two color differences or changes, etc.) is provided on the side facing the wearer's clothing, and the graphic is viewed from the surface sheet side. An absorbent article that is made visible is described. According to the absorbent article described in Patent Document 3, it is said that an emotional effect can be given to the user who has seen the graphic, and the user's depressed mood can be reduced.

  Patent Document 4 discloses a napkin body having a top sheet, a back sheet, and an absorbent body disposed between both sheets, and a packaging sheet in which the napkin body is folded and packaged so that the back sheet is on the outside. In the sanitary napkin for packaging, the design is printed on the entire absorber side of the back sheet so that the design can be seen through from the outside, and the back sheet is provided through the packaging sheet. A packaging sanitary napkin in which the transparency of the packaging sheet is set so that the pattern can be visually recognized is described. According to the packaging sanitary napkin described in Patent Literature 4, it is possible to camouflage the menstrual blood spots absorbed by the absorbent body with the design and to show the design outside before and after unpacking. It is said that the appearance can be camouflaged.

Japanese Patent No. 3558801 Japanese Patent Laying-Open No. 2005-512682 JP 2005-523139 A Japanese Patent No. 3862567

  Absorbent articles such as sanitary napkins are not fully effective until they are mounted in an appropriate position. However, there are many conventional absorbent articles which are difficult to distinguish at the first glance, and many of them easily induce a mistake in positioning at the time of wearing and easily leak. The techniques described in Patent Documents 2 to 4 mainly provide the user with a sense of security for leakage prevention by recognizing that functions such as liquid absorbency are enhanced, or absorbed menstrual blood In order to improve the concealability of excretory fluids, etc., it is a technology that applies colors and designs that can be seen from the outside by printing etc. on a predetermined part of the absorbent article, and there is room for improvement in terms of alignment at the time of wearing It was.

  Therefore, the subject of this invention is providing the absorbent article by which the position alignment at the time of mounting | wearing is made easy by making the color of a back surface sheet visible from the skin contact surface side.

  The present invention provides a substantially longitudinal absorption comprising a top sheet that forms a skin contact surface, a back sheet that forms a non-skin contact surface, and a liquid-retaining absorbent core disposed between both sheets. The absorbent core includes a plurality of independent absorbent members, and the plurality of absorbent members are arranged at predetermined intervals in at least one direction and are adjacent to each other. A gap is formed between the absorbent members so as to extend in the longitudinal direction of the article, and the gap is present at least in the central region in the width direction of the absorbent article, and the skin contact surface side of the absorbent article The problem is solved by providing an absorbent article in which the color of the back sheet is visible through a gap.

  According to the absorbent article of the present invention, the color of the back sheet is made visible from the skin contact surface side, so that the positioning at the time of wearing can be easily performed, and the fit to the user A sense of security can be given to functions such as leakage resistance.

FIG. 1 is a plan view schematically showing a skin contact surface side (surface sheet side) of a sanitary napkin that is a first embodiment of the absorbent article of the present invention. FIG. 2 is a cross-sectional view schematically showing a cross section taken along line II of FIG. FIG. 3 is a plan view schematically showing one surface (skin contact surface) of the back sheet provided in the napkin shown in FIG. 1. FIG. 4 is a plan view schematically showing one surface (skin contact surface) of the back sheet provided in the sanitary napkin according to the second embodiment of the absorbent article of the present invention. FIG. 5: is a top view which shows typically the skin contact surface side (surface sheet side) of the sanitary napkin which is 3rd Embodiment of the absorbent article of this invention. FIG. 6 is a perspective view schematically showing one surface (skin contact surface) of the absorbent core included in the napkin shown in FIG. 5. FIG. 7 is a cross-sectional view schematically showing a part of a cross section taken along line II-II in FIG. 8 (a) and 8 (b) are schematic views showing the stretched state of the absorbent core shown in FIG. 6, respectively. FIG. 9 is an explanatory diagram showing a positional relationship between the absorbent member and the fixing portion when the absorbent core shown in FIG. 6 is viewed in plan. FIG. 10 is a plan view schematically showing one surface (skin contact surface) of the back sheet provided in the sanitary napkin according to the third embodiment of the absorbent article of the present invention.

  Hereinafter, the absorbent article of this invention is demonstrated with reference to drawings based on the sanitary napkin which is one preferable embodiment. As shown in FIGS. 1 and 2, the napkin 1 according to the first embodiment includes a top sheet 2 that forms a skin contact surface, a back sheet 3 that forms a non-skin contact surface, and between the two sheets 2 and 3. The liquid-retaining absorbent core 4 interposed between the two is provided and has a substantially vertically long shape (long shape in one direction in a plan view as shown in FIG. 1).

  In the present specification, the skin contact surface is a surface of the sanitary napkin (absorbent article) or a component thereof directed to the wearer's skin when the sanitary napkin is mounted, and is a non-skin contact surface. Is the surface of the sanitary napkin or its member that is directed to the side opposite to the skin side (clothing side) when the sanitary napkin is mounted. The longitudinal direction is a direction along the long side of the sanitary napkin or its constituent members, and the width direction is a direction orthogonal to the longitudinal direction. In the drawing, the direction indicated by the symbol X is the article longitudinal direction (napkin longitudinal direction), and the direction indicated by the symbol Y is the article width direction (napkin width direction).

  The top sheet 2 and the back sheet 3 have dimensions larger than those of the absorbent core 4, extend from the peripheral edge of the absorbent core 4, and are joined to each other by heat sealing or the like at the ends of the extended portions. Forming part. Adhesive that fixes the napkin 1 to clothes such as underwear at a predetermined position (for example, below the absorbent core 4, particularly the central region) of the non-skin contact surface 3 b (non-skin contact surface of the napkin 1) of the back sheet 3 A portion (not shown) is provided. The pressure-sensitive adhesive portion is provided by applying a hot melt pressure-sensitive adhesive or the like at a predetermined location, and is covered with a release sheet (not shown) made of a film, nonwoven fabric, paper, or the like before the napkin 1 is used. .

  As shown in FIG. 1, the absorbent core 4 includes a plurality of (in the first embodiment, five) absorbent members 40 that are individually independent. The absorbent member 40 has a strip shape extending in the napkin longitudinal direction X in plan view, and continuously extends from the vicinity of the front end in the longitudinal direction of the napkin 1 to the vicinity of the rear end across the central portion. The plurality of absorbing members 40 are arranged at a predetermined interval W1 in the napkin width direction Y, and a gap 41 is formed between the adjacent absorbing members 40 and 40 so as to extend in the napkin longitudinal direction X. Each gap 41 is continuous over the entire length of the absorbent core 4 in the napkin longitudinal direction X. The gap 41 exists at least in the center region in the width direction of the napkin 1. Here, the central region in the width direction of the napkin 1 (absorbent article) is a center line extending in the longitudinal direction X at a position that is equidistant from both side edges 1s, 1s along the longitudinal direction X of the napkin 1 (the napkin 1 has a napkin width). A region within 25 mm in the width direction Y centered on a center line that is bisected in the direction Y (a region in the range of 12.5 mm to the left and right sides from the center line). In the central region in the width direction of the napkin 1 and in the central portion in the longitudinal direction of the napkin 1 or in the vicinity thereof, there is an excretion portion facing portion (not shown) that faces the excretion portion of the user when the napkin 1 is used. The absorbing member 40 and the gap 41 extend in the napkin longitudinal direction X across the excretory part facing part.

  Thus, the absorptive core concerning the present invention is an aggregate of an absorptive member which contains a plurality of individual absorptive members, and a gap is formed between adjacent absorptive members. When the absorbent core is an aggregate of absorbent members having such a gap, there is less discomfort than the absorbent core that is normally used in the technical field and does not substantially have a gap. Excellent follow-up to body shape and movement.

  In addition, in the gap between the absorbent members in the absorbent core according to the present invention, as in the first embodiment, 1) not only the form in which the constituent members of the absorbent core are not included in the gap, but also the first described later. As in the third embodiment, 2) the gap includes a constituent member of the absorbent core other than the absorbent member (the base sheet 65 in the third embodiment), but the absorption of the portion where the gap exists A form in which the thickness T1 of the absorbent core is smaller than the thickness T2 of the absorbent core in the portion where the absorbent member exists is also included. That is, it can be said that the absorbent core according to the present invention includes a thin portion in which no constituent member is present or the thickness is smaller than other portions of the absorbent core, and the thin portion is the gap. is there. In the embodiment 2), the ratio (T1 / T2) between the thicknesses T1 and T2 is preferably 0.01 to 0.2, more preferably 0.05 to 0.15.

As the absorbent member 40 constituting the absorbent core 4, various members conventionally used in the technical field can be used without particular limitation, and for example, A) made of hydrophilic fibers such as wood pulp and synthetic fiber. Fiber aggregates, B) those obtained by holding particulate superabsorbent resin in the fiber aggregates, C) aggregates of particulate superabsorbent resin, and the like can be used. Said A) and B) can be manufactured by a well-known method. As an absorptive core which contains the said C) as an absorptive member, the absorptive core of the structure by which the highly water-absorbent resin was interposed between the water-permeable sheets which oppose each other, for example is mentioned. Among these A) to C), B) is particularly preferable. Moreover, from the viewpoint of absorption performance and the like, the basis weight of each absorbent member 40 is preferably 100 to 500 g / m ² , more preferably 150 to 350 g / m ² .

In the absorptive core 4, the space | interval W1 (width | variety of the clearance gap 41) between the adjacent absorption members 40 and 40 becomes like this. Preferably it is 0.5-10 mm, More preferably, it is 2-5 mm.
Moreover, the width W2 of the absorbing member 40 is preferably 5 to 25 mm, and more preferably 10 to 20 mm.
Further, the ratio (W1 / W2) between the interval W1 and the width W2 is preferably 0.1 to 1, and more preferably 0.2 to 0.8.
Further, the number of band-shaped absorbent members 40 extending in the napkin longitudinal direction X per unit length (7 cm) in the napkin width direction Y is preferably 3 to 10, more preferably 5 to 7.

  As shown in FIG. 1, the absorbent core 4 composed of an assembly of a plurality of absorbent members 40 has a substantially rectangular shape with rounded corners as a whole in plan view. As shown in FIG. 2, substantially the entire absorbent core 4 is covered with a core wrap sheet 5, and all of the plurality of absorbent members 40 constituting the absorbent core 4 are integrally formed with the core wrap sheet 5. Is covered. In the first embodiment, the upper surface (skin contact surface), the lower surface (non-skin contact surface), and both side surfaces of the absorbent core 4 are respectively covered with the core wrap sheet 5, but the absorbent core 4 is absorbed. The whole or part of both end faces of the conductive core 4 (absorbing member 40) in the longitudinal direction X of the napkin are not covered with the core wrap sheet 5. However, in the present invention, the entire area of both end faces in the napkin longitudinal direction X of the absorbent core 4 may be covered with the core wrap sheet 5. As the core wrap sheet 5, a sheet normally used as a sheet for covering the absorbent core 4 in the technical field can be used as appropriate, and a liquid-permeable sheet is preferable, for example, a paper such as a tissue paper, Various nonwoven fabrics, perforated films, and the like can be used. However, as described later, the core wrap sheet 5 (the core wrap sheet 5 positioned between the top sheet 2 and the absorbent core 4) is preferably highly transparent.

  In 1st Embodiment, the core wrap sheet | seat 5 consists of one sheet | seat which has a width | variety of 2 times or more and 3 times or less of the length (width | variety) of the napkin width direction Y of the absorptive core 4. FIG. The absorptive core 4 covered with the core wrap sheet 5 is obtained as follows, for example. That is, the absorbent core 4 (a plurality of absorbent members 40) is placed at the center in the width direction of one core wrap sheet 5, and both widthwise sides of the sheet 5 are folded back to the upper surface side of the absorbent core 4. The absorbent core 4 is formed in a cylindrical shape by overlapping the widthwise side edges of the sheet 5 at the center in the width direction of the absorbent core 4 and joining them with a joining means such as an adhesive or heat seal. Substantially the whole can be covered with the sheet 5.

  The covering form of the absorbent core with the core wrap sheet according to the present invention is not limited to the form using one continuous core wrap sheet as in the first embodiment, and a plurality of core wrap sheets are used. It may be in any form. For example, using two core wrap sheets, one core wrap sheet covers the entire upper surface of the absorbent core 4, and the other core wrap sheet covers the entire lower surface of the absorbent core 4. You may coat | cover the both sides | surfaces of this absorptive core 4 with the extension part from the both sides edge of the absorptive core 4 in a sheet | seat or one sheet | seat.

  Between the absorbent core 4 (absorbing member 40) and the core wrap sheet 5 covering the same, a bonding means such as an adhesive or heat seal is provided at a predetermined portion (for example, the upper surface and / or the lower surface of the absorbent core 4). May be joined together. In addition, from the viewpoint of improving the visibility of the back sheet 3 through the gap 41, which will be described later, the core wrap sheet 5 covering the absorbent core 4 and the top sheet 2 and the back sheet 3 are bonded to each other. It is preferable that it is joined by means. In particular, below the gap 41, the core wrap sheet 5 and the back sheet 3 that cover the absorbent core 4 are preferably joined by the joining means. The joining means may be arranged continuously over the entire portion corresponding to each gap 41 between the core wrap sheet 5 and the back sheet 3, or discrete at predetermined intervals along each gap 41. May be arranged.

  In the first embodiment, the color of the back sheet 3 is visible through the gap 41 from the skin contact surface (skin contact surface 2 a of the top sheet 2) side of the napkin 1. That is, a portion of the napkin 1 located above the skin contact surface 3a of the back sheet 3 (a portion closer to the user's skin side than the skin contact surface 3a when the napkin 1 is attached) and the napkin 1 The portion that overlaps the gap 41 in plan view has transparency that allows the color of the back sheet 3 to be visually recognized through the gap 41 from the skin contact surface side of the napkin 1. Below, the specific structure of the napkin 1 relevant to such transparency is demonstrated.

From the viewpoint of imparting the transparency to the napkin 1, the top sheet 2 is preferably highly transparent. Transparency of the surface sheet 2 may be evaluated by the transparency T _P, as the value of the transparency T _P is large, high transparency, high see-through effect. It is preferable transparency T _P of the surface sheet 2 is 20 to 80, in particular 40 to 70. The transparency _TP is calculated by the following (formula 1) using the back black value L _B , the back white value L _W and the black measured value L ₀ measured by the following measurement method.
(Expression 1) Transparency T _P = {(L _W −L ₀ ) / (L _W −L _B )} × 100

<Measuring method of back black value L _B , back white value L _W and black measured value L ₀ >
1. Adjustment of measuring apparatus For measurement, a handheld simple spectral color difference meter NF333 manufactured by Nippon Denshoku Industries Co., Ltd. was used as an operation pen type. C2 was used as the light source. At the tip of the NF333 pen type sensor, a tip diameter of φ8 mm was selected and used as a measuring device. In the measurement on the standard plate attached to NF333 with a tip diameter of φ8 mm, the measured value of the white reference plate is L * value 96, a * value −1, b * value 2, and the measured value of the black reference plate is The L * value was 0, the a * value was 0, and the b * value was 6. These measured values are average values of three measurements.

2. Measurement Procedure The back black value L _B , the back white value L _W and the black measurement value L ₀ are measured by the following procedure. A standard black plate attached to the spectral color difference meter NF333 is attached to the tip of the pen type sensor of the spectral color difference meter NF333 (the target plate attached to the NF333 is used. The measurement position can be easily determined by using the target plate). The L * value was measured three times and the average value thereof was defined as the back black value L _B (value 0). Further, the L * value was measured three times in the same manner as described above except that the standard white plate attached to the spectral color difference meter NF333 was used instead of the standard black plate, and the average value thereof was calculated as the back white value L _W (value 96). Next, a measurement sample (surface sheet) is placed on a standard black plate, the tip portion of the pen type sensor is applied to the measurement sample, L * values are measured three times, and the average value thereof is measured as a black measurement value L _0. It was.

From the same viewpoint as described above, the core wrap sheet 5 (core wrap sheet covering the skin contact surface of the absorbent core 4) located between the top sheet 2 and the absorbent core 4 is highly transparent. ones, more specifically, the transparency T _P 15 to 80, particularly preferably 20 to 60. On the other hand, the core wrap sheet 5 (core wrap sheet covering the non-skin contact surface of the absorbent core 4) located between the back sheet 3 and the absorbent core 4 is also preferably highly transparent, and its transparency T _P is, can be the same as the transparency T _P of the core wrap sheet located between the topsheet 2 and the absorbent core 4, may be transparent is lower than the core wrap sheets.

As the surface sheet 2, one having a transparency T _P within the above range and liquid permeability is preferable. Suitable as the top sheet 2 is, for example, a non-woven fabric or a perforated sheet in which a through-hole is formed in a resin film, a non-woven fabric using a heat-extensible fiber described in Japanese Patent Application No. 2009-239846, and a fiber diameter of 2.2 dtex or more An air-through non-woven fabric made of fibers having a titanium dioxide content of 0.5% or less. The thickness and basis weight of the surface sheet 2 can be appropriately set in consideration of the balance between the transparency and the strength. The thickness of the top sheet 2 under no load is preferably 0.3 to 1 mm, more preferably 0.4 to 0.8 mm. The basis weight of the top sheet 2 is preferably 15 to 40 g / m ² , more preferably 20 to 30 g / m ² .

The core wrap sheets 5 (core wrap sheet 5 positioned between the topsheet 2 and the absorbent core 4), those transparency T _P is located and liquid permeability within the range are preferred. Suitable as the core wrap sheet 5 is, for example, an air-through nonwoven fabric or a spunbond nonwoven fabric without pores, a paper blended with synthetic fibers, a low crepe paper composed of pulp fibers, and the like. The thickness and basis weight of the core wrap sheet 5 can be appropriately set in consideration of the balance between the transparency and the strength. The thickness of the core wrap sheet 5 under no load is preferably 0.05 to 0.15 mm, more preferably 0.08 to 1.2 mm. The basis weight of the core wrap sheet 5 is preferably 10 to 30 g / m ² , more preferably 13 to 20 g / m ² .

Regarding the top sheet 2 and the core wrap sheet 5 (the core wrap sheet 5 positioned between the top sheet 2 and the absorbent core 4), a general paper (a sheet-like material obtained by a wet papermaking method) includes fibers and fibers. The paper is clogged and has no gaps, so even if it has the same basis weight as a non-woven fabric with gaps (air-through) compared to the paper, the transparency is low, but with a low basis weight paper of about 13-20 g / m ² If present, the crepe is low and can be disposed on the skin contact surface (upper surface) of the absorbent core 4. On the other hand, paper with a large crepe (crepe rate of 10% or more) has a large basis weight and is less transparent than low crepe low basis weight paper due to light scattering due to unevenness. 2 and the core wrap sheet 5) located between the absorbent core 4 is not preferable. Further, in relation to this, from the viewpoint of improving the visibility of the back sheet 3 through the gap 41, when a constituent member other than the core wrap sheet is disposed between the top sheet 2 and the absorbent core 4, As the constituent member, it is preferable not to use paper in which constituent fibers are clogged.

  In the first embodiment, when the skin contact surface of the napkin 1 (skin contact surface 2a of the top sheet 2) is visually observed, the color tone (color shading, light and dark) of the back sheet 3 that is visually recognized through the gap 41. , Strength, etc.) are not uniform throughout the gap 41. That is, the color tone of the back sheet 3 that is visible from the gap 41 is not the same in the entire gap 41 that is visible in the plan view when viewed from the skin contact surface side of the napkin 1 as shown in FIG. , Partly different. Furthermore, in 1st Embodiment, since the core wrap sheet | seat 5 is overlaid in the width direction center part of the absorptive core 4 as mentioned above, the back surface visually recognized from the clearance gap 41 located in the overlapped part. Even if the color tone of the back sheet 3 (the color tone when the back sheet 3 is viewed directly without the gap 41) is the same, the color tone of the sheet 3 looks different.

  Such a non-uniform color tone of the back sheet 3 through the gap 41 in a plan view on the skin contact surface side of the napkin 1 is the position and shape of the gap 41; more than the back sheet 3 when the napkin is attached. Transparency of the part corresponding to the gap 41 of the napkin constituent members (surface sheet 2, core wrap sheet 5, etc.) disposed on the skin side; depends on the color tone of the back sheet 3 and the like. Further, the color tone of the back sheet 3 depends on the hue of the color applied to the back sheet 3, its density, the degree of pattern density, and the like. Accordingly, by adjusting these factors as appropriate, the above-described non-uniform color tone of the back sheet 3 through the gap 41 can be obtained. Among the factors affecting the non-uniform color tone of the back sheet 3 through the gap 41, the factors other than the back sheet 3 are as described above, and the back sheet 3 will be described below.

  FIG. 3 schematically shows a skin contact surface 3a (a surface facing the absorbent core 4) of the back sheet 3 provided in the napkin 1 of the first embodiment. In FIG. 3, for ease of explanation, the absorbent core 4 (absorbing member 40) is indicated by a two-dot broken line. However, the actual skin contact surface 3 a of the back sheet 3 has such an absorptive property. There is no symbol indicating the presence of the core 4. In 1st Embodiment, the color of the back surface sheet 3 is the direction of the circumference | surroundings of this part rather than the part (part which overlaps with the said excretion part opposing part in planar view) corresponding to the said excretion part opposing part in this back sheet 3 Is relatively dark. More specifically, a color other than the ground color (usually white) of the skin contact surface 3a is given to the skin contact surface 3a of the back sheet 3 by printing, and as shown in FIG. The color of the skin contact surface 3a is given a radial gradation so that the color of the skin contact surface 3a gradually becomes darker and clearer as it goes from the center of 3 to the periphery. The entire contact surface 3a is not uniform. In this color gradation, the further away from the center of the back sheet 3, the higher the density of the color. Therefore, the peripheral portion of the skin contact surface 3 a (the hatched portion in FIG. 3) is inward of it. The color is darker and clearer than the central portion (the portion not hatched in FIG. 3), and in particular, the front and rear end portions in the napkin longitudinal direction X are more colored than the side edges in the napkin width direction Y. It is dark and clear. The central part of the back sheet 3, which is the lowest color density in the gradation of the color of the skin contact surface 3 a, is the background color (white) of the skin contact surface 3 a or a color other than the background color and its density Can be low.

  In the napkin 1 of the first embodiment, since the back sheet 3 is configured in this way, the napkin constituent member (the top sheet 2, the absorbent core) disposed on the skin side of the back sheet 3 when the napkin is mounted. 4 and the core wrap sheet 5) are configured as described above, and the back surface is visible through the gap 41 in a plan view on the skin contact surface side of the napkin 1 as shown in FIG. The color tone of the sheet 3 is different in each part of the gap 41. More specifically, the closer to the periphery of the napkin 1 (back surface sheet 3), the darker the color of the back sheet 3 appears, and in particular, the front end portion 41a of the clearance 41 located on the front end side in the napkin longitudinal direction X, and the rear The rear end portion 41b of the gap 41 located on the end side is located more inward in the napkin longitudinal direction X than the both end portions 41a and 41b, compared to the longitudinal center portion 41c of the gap 41. The color looks dark and easily visible. Thus, both end portions 41a and 41b of the gap 41 where the color of the back sheet 3 looks relatively dark are located in the front and back of the napkin longitudinal direction X across the excretory portion facing portion.

  The color applied to the skin contact surface 3 a of the back sheet 3 is preferably a dark hue from the viewpoint of improving the visibility through the gap 41. About this point, the following procedure evaluated the hue of the back surface sheet which can be seen through the clearance gap between the some absorption members in an absorptive core.

That is, the hue of the back sheet seen through the absorbent core (including the core wrap sheet) is evaluated in a state where the top sheet is removed from the absorbent article (sanitary napkin) having the basic configuration as shown in FIGS. did. When using a printed film material as the back sheet, place the material on the top surface of the standard white plate attached to the Nippon Denshoku Industries Co., Ltd. handheld simple spectral color difference meter NF333 (measuring diameter: 8 mm). Although it can be evaluated, “TOYO94 COLOR FINDER 1050” manufactured by Toyo Ink was used. The color samples used were CF0071 (red 1), CF0082 (red 2), CF0177 (yellow 1), CF0172 (yellow 2), CF0285 (green 1), CF0273 (green 2), CF0414 ( Blue series 1) and CF0421 (blue series 2) were selected. In each of the system colors, 2 is lighter than 1 and has a higher L value. In addition, as the “absorbent core configured to include a plurality of individually independent absorbent members and having a gap between the adjacent absorbent members”, an actual core may be used. A pulp base paper (manufactured by Wafer User, basis weight of 285 g / m ² , thickness of 1.25 mm) in which a rectangular cutout having a side of 10 mm was formed was used. Measurement samples are obtained by stacking core wrap sheets on the upper and lower surfaces of this pulp base paper (absorbent core model), and further stacking one of the color samples on the lower surface of the core wrap sheet disposed on the lower surface side of the pulp base paper. The L * value, the a * value, and the b * value of the measurement sample were measured through the cutout portion according to the method described above. The measurement results are shown in Table 1 below. In Table 1, distance W1 corresponds to the width of the gap between the absorbing member (see FIG. 1), the transparency, corresponds to the transparency T _P for the upper and lower core wrap sheet in the gap between the absorbing member, a core wrap interval T Corresponds to the thickness of the absorbent core. In addition, the visibility evaluation is a result of the evaluation impressions by the three initial observers, and the a ^* value and b ^* value are the same as “no core wrap sheet” (reference) and the sign (positive or negative). and a ^* value, b ^* or even one absolute value is 10 or more when the ◎, a ^* and b ^* values are and the a ^* value in the reference the same reference numerals, b ^* or higher values When the absolute value is 5 to 10, either one of ○, a ^* value, and b ^* value is 5 to 10 in absolute value and the other is a sign different from the reference, or a ^* value, b ^* If the higher sign of the value is not changed with respect to the reference and the absolute value is 3 to 5, Δ, the absolute value of the a ^* value and the b ^* value is 3 or less, or The case where the sign of the a ^* value or the b ^* value was different from the reference and was 3 or more in absolute value was x.

From the results shown in Table 1, the L ^* value of the back sheet is preferably 45 or more, and if it is less than 45, the visibility is poor. On the other hand, as the core wrap interval T increases (that is, the thickness of the absorbent core increases), the visibility decreases, but the L ^* value and “no core wrap sheet” at a predetermined core wrap interval T (0 mm, 15 mm, 25 mm). ΔL, which is the absolute value of the difference from the L ^* value in (reference), should be 35 or less, and the sign of the a ^* value or b ^* value does not change, preferably 4 or more, more preferably 6 or more. It ’s fine. That is, the hue of the back sheet (skin contact surface 3a of the backsheet 3), L ^* than cool value is less bluish or greenish, preferably warm red or yellow, even a ^* value or b therein ^{* A} dark color system having a value of 40 or more, more preferably 50 or more is preferred.

  Moreover, although the difference by space | interval W1 (gap between the some absorption members which comprise an absorptive core) is not seen, visibility is improved because a back surface sheet becomes dark, so that core wrap space | interval T (thickness of an absorptive core) becomes large. It is considered that the cross-sectional shape along the napkin width direction of the absorbent core (the cross-sectional shape along the napkin width direction of the gap between the plurality of absorbent members constituting the absorbent core) is smaller than the minimum position of the interval W1. A shape in which the interval W1 increases toward the top sheet side is preferable. For example, it is preferable that the cross-sectional shape along the napkin width direction of the gap 41 gradually increases from the back sheet 3 side toward the top sheet 2 side.

  The color printing method on the skin contact surface 3a of the back sheet 3 is not particularly limited. For example, a known printing method such as a screen printing method, an ink jet printing method, a gravure printing method, a flexographic printing method, or a lithographic printing method is used. be able to.

As the back sheet 3, various types conventionally used in the technical field can be used without particular limitation. In particular, when colors and designs are applied to the back sheet 3 by printing, from the viewpoint of improving the vividness of the printed colors and designs, and hence the visibility through the linear grooves 5, the back sheet 3. As, a moisture-permeable sheet having high whiteness is preferable. Here, having high whiteness means that the whiteness is 80 or more, preferably 90 or more. The white chromaticity is meant the whiteness of the sheet as defined in L * value of according to the measuring method such as back black value L _B described above, the color difference measurement using the tip diameter of the measuring diameter 8 mm (standard white plate). Further, the moisture vapor permeable sheet is, JIS moisture permeability test method (Z0208, cup method 40 ° C.) with moisture permeability prescribed by 240g / m ² · 24hr or more, preferably 720g / m ² · 24hr or more sheets. Specific examples of the moisture-permeable sheet having high whiteness include a polyethylene film obtained by mixing a granular material such as barium sulfate or calcium carbonate with a film-forming resin and then stretching the mixture. The basis weight of the backsheet 3 is preferably 15 to 50 g / m ^2, more preferably a 20 to 40 g / m ^2.

  The napkin 1 of the first embodiment is used by being attached to an undergarment in the same manner as a normal sanitary napkin of this type. Since the napkin 1 of 1st Embodiment can visually recognize the color of the back surface sheet 3 through the clearance gap 41 when the skin contact surface (skin contact surface 2a of the surface sheet 2) is visually observed, it is absorptive. The shape or the like of the absorbent core 4 in plan view, such as the core 4 having the gap 41, is easily recognized by the user, thereby enabling easy alignment at the time of wearing. In addition, the fact that the absorbent core 4 has the gap 41 reminds the user of the existence of individual absorbent members 40 that can follow the user's body to some extent independently when worn, It is possible to give the user a sense of security with respect to functions such as fit and leakage prevention.

  Further, the napkin 1 according to the first embodiment is visually recognized through the gap 41, and the color tone of the back sheet 3 is not uniform throughout the gap 41 but is partially different. Matching can be done particularly easily. That is, the napkin 1 according to the first embodiment includes the excretory portion of the band-shaped gap 41 extending from the front end portion to the rear end portion in the napkin longitudinal direction X in the plan view of the skin contact surface as shown in FIG. The other part of the gap 41 (longitudinal direction) in which the front end part 41a and the rear end part 41b, which are located before and after the napkin longitudinal direction X across the opposing part (not shown), straddle the excretory part opposing part Since the color of the back sheet 3 is more easily recognized than in the central portion 41c), the presence of the excretory portion facing portion and the front-rear direction thereof are easily recognized by the user, and thereby alignment when the napkin is attached In addition, this function and effect can give the user a sense of security with respect to functions such as fit and leakproofness.

  Below, other embodiment of the sanitary napkin of this invention is described with reference to FIGS. In other embodiments to be described later, components different from those of the first embodiment described above will be mainly described, and similar components will be denoted by the same reference numerals and description thereof will be omitted. The description of the first embodiment is appropriately applied to components that are not particularly described.

  FIG. 4 is a plan view schematically showing one surface (skin contact surface) of the back sheet provided in the sanitary napkin according to the second embodiment of the sanitary napkin of the present invention. The napkin of the second embodiment is different from the first embodiment in the design of the skin contact surface 3a of the back sheet 3. In the second embodiment, a large number of independent heart-shaped symbols 31a are applied to substantially the entire skin contact surface 3a of the back sheet 3 by printing. The color of the pattern 31 a is a color different from the ground color (usually white) of the skin contact surface 3 a of the back sheet 3. The color of the pattern 31a is preferably a warm color, and the same color as that applied to the skin contact surface 3a of the back sheet 3 in the first embodiment can be employed.

  As shown in FIG. 4, a large number of symbols 31 a are arranged on the skin contact surface 3 a of the back surface sheet 3 at predetermined intervals in a direction Z that intersects the direction in which the gap 41 extends (longitudinal direction X of the napkin). Are arranged at predetermined intervals in a direction orthogonal to the direction Z to form a print pattern of the skin contact surface 3a according to the second embodiment. Thus, when a large number of symbols 31a are arranged in the direction Z intersecting with the direction X in which the gap 41 extends, the number of symbols 31a is in parallel with the direction X in which the gap 41 extends. And since the probability that the clearance gap 41 and the pattern 31a overlap will increase, the visibility of the back surface sheet 3 (symbol 31a) through the clearance gap 41 in the planar view of the skin contact surface of the napkin 1 will further increase.

The distance between the adjacent symbols 31a and 31a is preferably narrower than the width W2 (see FIG. 1) of the absorbent member 40 in the absorbent core 4, and the distance between the symbols 31a and 31a is preferably 1 to 15 mm. More preferably, it is 3 to 10 mm. The number of unit area (25 cm ²⁾ per symbol 31a is preferably 2 to 100, more preferably from 10 to 50. The size of the pattern 31a is preferably inscribed in a circle having a diameter of 3 to 15 mm, particularly 5 to 10 mm, from the viewpoint of improving the visibility.

  In addition, the shape of the pattern 31a in plan view is not limited to the heart shape, and can be, for example, a four-leaf, cursive alphabet, a cluster body combining a plurality of geometric figures, and two or more different types. You may combine shapes. However, from the viewpoint of improving the visibility through the gap 41 from the skin contact surface side of the napkin 1, the shape in plan view is a shape with a sharp corner (for example, a star shape). A shape with rounded corners, such as a heart shape, is preferable to a shape that is difficult to recognize (recall) the entire shape by just looking.

  According to the second embodiment, the same effect as that of the first embodiment can be obtained. Since the napkin of 2nd Embodiment can visually recognize the pattern 31a given to the skin contact surface 3a of the back surface sheet 3 through the clearance gap 41 when the skin contact surface side is visually observed, an absorptive core It is easy for the user to recognize that the gap 4 has a gap 41. This makes it possible to easily perform alignment at the time of wearing, and to the user for functions such as fit and leakproofness. A sense of security can be given.

  FIG. 5 is a view corresponding to FIG. 1 of a sanitary napkin according to a third embodiment of the sanitary napkin of the present invention. The napkin 1 of the third embodiment is different from the first embodiment in the configuration of the absorbent core 6. Below, the absorptive core 6 which concerns on 3rd Embodiment is demonstrated with reference to FIGS.

  As shown in FIGS. 5 and 6, the absorbent core 6 includes a plurality of individually independent absorbent members 60 and a base sheet 65 having elasticity. The plurality of absorbing members 60 are fixed to one surface 65 a of the base sheet 65. One surface 65 a of the base sheet 65 is a surface that forms a skin contact surface of the absorbent core 6.

  The plurality of absorbent members 60 are arranged on the one surface 65a of the base sheet 65 so as to form a row with predetermined intervals W1 in both the longitudinal direction X of the napkin and the width direction Y, and between the adjacent absorbent members 60, 60. A gap 61 (the thin-walled portion) is formed. In the gap 61, the one surface 65a of the base sheet 65 is exposed. As shown in FIG. 1, the gap 61 is continuous over the entire length of the absorbent core 6 in the napkin longitudinal direction X, and is continuous over the entire length of the absorbent core 6 in the napkin width direction Y. That is, the gap 61 is formed extending in both the napkin longitudinal direction X and the napkin width direction Y. Thus, when the gap 61 is continuous over the entire width of the absorbent core 6, the flexibility of the absorbent core 6 is improved (the absorbent core 6 extends along the gap 61 extending in the napkin width direction Y). It is easy to bend in the longitudinal direction X of the napkin) and reminds the user of the existence of individual absorbent members 60 that can follow the user's body to some extent independently when worn, It can give a sense of security to functions such as leakage prevention. Further, the design of the back sheet is more easily recognized, and emotional security is given in addition to the position information of the napkin.

As shown in FIG. 6, the absorbing member 60 has a rectangular shape with rounded corners and a slightly convex outward curve on the four sides in plan view. However, the shape of the absorbing member 60 in plan view is not limited to this. For example, the absorbing member 60 may have a circular shape, a square shape, a rectangular shape, or a rhombus shape in plan view. Also, a combination of two or more of these shapes may be used. As the absorption member 60, the thing similar to the absorption member 40 in 1st Embodiment can be used. The basis weight of the absorbent member sheet 60 is preferably 50 to 400 g / m ² , more preferably 100 to 300 g / m ² .

In the absorbent core 6, the interval W1 between the adjacent absorption members 60, 60, the width W2 of the absorption member 60, and the ratio (W1 / W2) between the interval W1 and the width W2 are the same as those in the first embodiment. be able to. Moreover, the number per unit area (25 cm < ² >) of the absorption member 60 becomes like this. Preferably it is 3-25 pieces, More preferably, it is 5-15 pieces.

  The base sheet 65 to which the plurality of absorbing members 60 are fixed is a sheet-like material, and has elasticity in at least one direction within a plane. The base sheet 65 is a part that imparts stretchability to the absorbent core 6. Elasticity refers to the property of being able to be stretched and contracted by releasing the stretched state. The base sheet 65 has stretchability in at least two directions of the napkin longitudinal direction X and the width direction Y. By extending and contracting the base sheet 65 in each direction X, Y, the gap 61 is formed in each direction X, Y. It is made possible to expand and contract. The base sheet 65 may be a single layer sheet or a multilayer laminated sheet formed by joining a plurality of sheets.

  The absorbing member 60 is fixed to the base sheet 65 via a fixing point 62 in such a manner that the shape does not change even when the base sheet 65 is expanded or contracted. In FIG. 7, the fixed point 62 is indicated by a bold line for convenience. In order to prevent the shape of the absorbent member 60 from changing even if the base sheet 65 is expanded and contracted, it is advantageous that the absorbent core 6 does not exhibit elasticity at the fixing point 62. Since the fixing point 62 does not exhibit stretchability, the base sheet 65 does not expand or contract at the fixing point 62 even if the base sheet 65 is expanded or contracted. As a result, the absorbing member 60 fixed to the base sheet 65 via the fixing point 62 is not affected by the expansion and contraction of the base sheet 65, and the shape does not change due to the expansion and contraction of the base sheet 65. Since the shape of the absorbent member 60 does not change, even if the absorbent core 6 expands and contracts, it is difficult for the absorbent performance to change, and stable absorbent performance can be expressed over the use period of the napkin 1.

  In order to prevent the absorbent core 6 from exhibiting stretchability at the fixed point 62, for example, the fixed point 62 may be formed by ultrasonic embossing to lose the stretchability of the base sheet 65. Also, the stretchability of the base sheet 65 can be lost by forming the fixing points 62 with an adhesive such as a hot melt adhesive.

  In the absorbent core 6, as described above, the fixing point 62 does not exhibit stretchability. In other words, the part that exhibits stretchability in the absorbent core 6 is only the part between the fixing points 62 and 62. That is, as shown in FIG. 8A, when the absorbent core 6 in the natural state (relaxed state) is extended in the plane direction, as shown in FIG. Only stretches. At this time, the shape of the absorbing member 60 is not changed. Then, when the stretched state of the absorbent core 6 in the stretched state is released as shown in FIG. 8B, only the portion between the fixed points 62 and 62 contracts, and the shape of the absorbent member 60 does not change. . The absorptive core 6 is excellent in the adaptability to the user's body shape and the follow-up performance of the napkin 1 by having such a stretch characteristic.

  FIG. 9 shows the positional relationship between the absorbent member 60 and the fixing portion 62 when the absorbent core 6 is viewed in plan. As is clear from the figure, the outline of the fixing member 62 is included in the outline of the absorbent member 60 in plan view, and as is apparent from FIG. It is located on the fixed point 62. As a result, the absorbing member 60 has a shape having a projecting portion 63 projecting outward from the fixed point 62 in the planar direction. The overhang portion 63 is separated from the base sheet 65 or the lower surface of the overhang portion 63 is in contact with the base sheet 65. In any case, the absorbing member 60 is not fixed to the base sheet 65 in the overhang portion 63. Since the absorbing member 60 has such an overhang portion 63, the loss of stretchable area of the base sheet 65 due to the formation of the fixing point 62 is reduced as much as possible, and the base sheet 65 is satisfactorily improved. While maintaining the elasticity, the total area of the absorbent member 60 can be increased as much as possible to improve the absorbent performance of the absorbent core 6. Maintaining good stretchability of the base sheet 65 leads to an effect of improving the conformity and followability of the napkin 1 to the user's body shape. Increasing the total area of the absorbent member 60 as much as possible leads to an effect that the distance between the adjacent absorbent members 60 and 60 is not so large even when the absorbent core 6 is extended, and the absorption performance is not easily lowered. .

  As the base sheet 65, a stretchable sheet can be used. As such a sheet, a three-dimensional network is formed in the structure by means of, for example, a non-woven fabric (elastic non-woven fabric) containing a fiber containing an elastic resin as a constituent fiber, a film containing an elastic resin (elastic film), or foaming. And an elastic porous body made of an elastic resin. As the elastic nonwoven fabric, the elastic film, and the elastic porous body, those known in the technical field can be used.

  The degree of stretchability of the base sheet 65 is such that the stretch rate measured by the following method is not less than 5%, particularly not less than 8%. It is preferable from the point which becomes.

<Measurement method of stretch rate>
Measurement is performed in a tensile mode using a tensile compression tester RTC-1210A (Toyo Orientech Co., Ltd.). First, the base sheet 65 is cut into a width of 25 mm and a length of 150 mm, and a measurement piece is collected. Set the test piece between the air chucks attached to the tensile and compression tester with an initial sample length (distance between chucks) of 100 mm, and the chuck attached to the load cell (rated output 5 kg) of the tensile and compression tester at a speed of 300 mm / min. Raise the measurement piece. When the measurement piece extends 50% of the initial sample length, that is, 50 mm, the moving direction of the chuck is reversed, the chuck is lowered at a speed of 300 mm / min, and returned to the position of the initial sample length. During this operation, the relationship between the load detected by the load cell and the elongation of the measurement piece is recorded on a chart, and the expansion / contraction ratio is obtained from the following equation (1) based on this chart. Stretch rate = Recovery elongation / Maximum elongation length (= 50 mm) (1) Here, the recovery elongation is the maximum elongation when zero load is recorded for the first time when the chuck is lowered from the maximum elongation length (= 50 mm). It is defined by the chuck movement distance from the length.

  In the above <Method for measuring expansion / contraction ratio>, when the measurement piece is less than the above-mentioned size, measurement is performed by the following method. Specimen: Specimen (L + 2S) so that the length ratio is L: C = 3: 5, where Lmm is the length between the chucks of the sheet, Smm is the length of the gripping part, and Cmm is the width. Cut to a size of mm × Cmm and collect a measurement piece. Test: A test piece was set on a tensile / compression tester at a distance L between chucks, and increased until 100 × (L / 30) mm / min and the measurement piece was stretched by 50% of the initial sample length. Thereafter, the moving direction of the chuck is reversed, the chuck is lowered at a speed of 100 × (L / 30) mm / min, and returned to the initial sample length position. It calculates with following Formula (2). Stretch rate = Recovery elongation / Maximum elongation length (= L / 2mm) (2)

  In addition, the base sheet 65 is preferably highly transparent from the viewpoint of imparting the transparency to the napkin 1 of the third embodiment, and more specifically, the transparency Tp is 20 to 90, particularly 30 to 80. Preferably there is. As the base sheet 65, the same sheet as the back sheet 3 can be used, and the above-described moisture-permeable sheet having high whiteness is preferably used.

The base sheet 65 preferably has a stretch ratio and a transparency Tp within the above ranges and a liquid permeability. The base sheet 65 is preferably a sheet or net made of a diene material such as polyurethane or butadiene. The thickness and basis weight of the base sheet 65 can be appropriately set in consideration of the balance between the transparency and the strength, respectively. The thickness of the base sheet 65 under no load is preferably 0.05 to 0.8 mm, more preferably 0.1 to 0.5 mm. The basis weight of the base sheet 65 is preferably 12 to 30 g / m ² , and more preferably 15 to 25 g / m ² .

  The absorptive core 6 of 3rd Embodiment can be manufactured according to the method as described in Unexamined-Japanese-Patent No. 2009-136498 based on the previous application of this applicant. The stretchable absorber described in this publication can be suitably used as the absorbent core 6.

In the third embodiment, the color of the back sheet 3 is relatively darker around the part than the part corresponding to the excretory part facing part in the back sheet 3. More specifically, as shown in FIG. 10, the skin contact surface 3a of the back sheet 3 has a relatively dark portion (dark portion) 35 and a relatively light portion (light color portion). 36. The dark color portion 35 is a portion in which a predetermined portion of the skin contact surface 3a is filled with a color other than the ground color (usually white) of the skin contact surface 3a and a darker hue than the light color portion 36 by printing. In the plan view, a closed elliptical ring is formed, and the color tone of the dark portion 35 is uniform. The annular dark color portion 35 is located substantially at the center of the skin contact surface 3a, and the ring is a light color portion 36, and the excretory portion facing portion exists in the ring. The color of the dark portion 35 is preferably a dark hue having an a ^* value or b ^* value of 40 or more, more preferably 50 or more. For example, printing is performed on the skin contact surface 3a of the back sheet 3 in the first embodiment. It is possible to adopt the same colors as those applied by.

  A portion other than the dark color portion 35 in the skin contact surface 3 a of the back sheet 3 is a light color portion 36. The light color portion 36 can be a ground color (white) of the skin contact surface 3 a or a color other than the ground color, and the density thereof can be lower than the color density of the dark color portion 35.

  In the napkin 1 of the third embodiment having such a configuration, the color tone of the back sheet 3 that is visually recognized through the gap 61 in a plan view on the skin contact surface side of the napkin 1 as shown in FIG. It differs in the said excretion part opposing part and its circumference | surroundings. More specifically, the gap 61 overlaps the light-colored part 36 of the back sheet 3 around the excretion part facing part (not shown) and overlaps the dark-colored part 35 of the back sheet 3. The color of the back sheet 3 appears darker than the gap 61. Thereby, presence of the said excretion part opposing part and its front-back direction are easy to be recognized by the user. According to the third embodiment, the same effect as that of the first embodiment is achieved.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, in the above-described embodiment, the skin contact surface 3a of the back sheet 3 is provided with colors and designs, but the non-skin contact surface 3b of the back sheet 3 may be provided with colors and designs, or Colors and designs may be applied to both surfaces 3a and 3b. In addition, the visibility can be changed by using not only shades of the same color tone but also different color tones (for example, a cold color and a warm color). Also, as a means of improving visibility without changing the thickness of the absorbent core, a sheet (core wrap sheet) disposed on the upper surface (skin contact surface) side of the absorbent core is allowed to enter the absorbent core. Thus, the core wrap interval T of the sheet on the upper surface side and the lower surface (non-skin contact surface) side of the absorbent core can be reduced to change the visibility to a thinner absorbent core (absorber). Further, the portions of only the one embodiment described above can be used as appropriate.

  In addition, a pair of three-dimensional gathers extending in the longitudinal direction may be arranged on both side portions along the longitudinal direction on the skin contact surface side of the napkin 1. The three-dimensional gather includes, for example, a belt-like sheet in which one end portion in the width direction of the napkin 1 is fixed, and one or a plurality of pieces that are fixed in an extended state to the other end portion (free end portion) in the width direction of the belt-like sheet. The three-dimensional gather forming elastic member can be provided. Moreover, in the skin contact surface (skin contact surface 2a of the surface sheet 2) of the napkin 1 in the area | region which overlaps with the absorptive core 4 in the planar view for the purpose of a leak-proof property, a fit improvement, etc. In addition, a recessed portion (groove portion) in which the topsheet 2 and the absorbent core 4 are integrally recessed toward the backsheet 3 may be formed. Moreover, in the said embodiment, although the sanitary napkin was mentioned as one of the application examples of the absorbent article of this invention, For example, it can apply also to a disposable diaper, a panty liner (orimono sheet), an incontinence pad, etc.

1 Sanitary napkin (absorbent article)
2 Surface sheet 2a Skin contact surface 3 of top sheet Back sheet 3a Skin contact surface 3b of back sheet Non-skin contact surface 35 of back sheet Dark color portion 36 Light color portion 4, 6 Absorbent core 40, 60 Absorbing member 41 , 61 Gap between adjacent absorbent members 62 Fixing point 65 of absorbent member Base sheet X Napkin longitudinal direction Y Napkin width direction

Claims (5)

A substantially vertically long absorbent article comprising a top sheet for forming a skin contact surface, a back sheet for forming a non-skin contact surface, and a liquid-retaining absorbent core interposed between the two sheets. And
The absorbent core is configured to include a plurality of individually independent absorbent members,
The plurality of absorbent members are arranged at predetermined intervals in at least one direction, and a gap extends between the adjacent absorbent members in the longitudinal direction of the article, and the gap is at least of the absorbent article. It exists in the center area in the width direction,
The absorbent article in which the color of the back sheet is visible through the gap from the skin contact surface side of the absorbent article.   The absorbent article according to claim 1, wherein a color tone of the back sheet, which is visually recognized through the gap when the skin contact surface of the absorbent article is visually observed, is not uniform throughout the gap.   The absorbent article according to claim 1 or 2, wherein the gap is continuous over the entire length of the absorbent core in the article width direction.   The said some absorption member is being fixed to one surface of the base sheet which has a stretching property, The said clearance gap can be expanded / contracted by expanding / contracting this base sheet. Absorbent article.   It has an excretion part facing part that faces the excretion part of the user at the time of use, and the color of the back sheet is more relative to the periphery of the part than the part corresponding to the excretion part facing part of the back sheet The absorbent article according to any one of claims 1 to 4, which is dark.

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