TW202106268A - Absorbent article - Google Patents

Abstract

This absorbent article: comprises an absorbent body (1A) that includes a liquid-permeable surface sheet (2), a leakage prevention sheet (3), and an absorber (4) that is positioned between the two sheets; has a longitudinal direction (X) corresponding to a front-back direction of a wearer and a width direction (Y) that is orthogonal to the longitudinal direction; and has a ventral region (F), a dorsal region (R), and an inseam region (M). An injector (1D) that indicates urination through a change in color is disposed on a skin-facing surface side of the leakage prevention sheet (3), and an exterior sheet (5) consisting of a nonwoven fabric is disposed on a non-skin-facing surface side of the leakage prevention sheet (3). The exterior sheet (5) covers the non-skin-facing surface side of the region of the absorbent body (1A) where the injector (1D) is disposed. The thickness rate-of-change of the exterior sheet is 20%-75% when a dry and no-load state changes to a state of being wet and pressurized under a load of 0.5 N/cm2.

Description

Absorbent articles

The present invention relates to an absorbent article.

Previously, there are known disposable diapers equipped with an indicator for judging whether the wearer has excreted according to the color. For example, Patent Document 1 describes a disposable diaper in which a hydrophilic composition that changes color by contact with moisture, a so-called indicator strip, is arranged between an absorbent core and a back sheet.

In addition, Patent Document 2 describes an absorbent article such as a disposable diaper in which an indicator portion is formed between the back sheet and the absorbent body so as to extend in the longitudinal direction across the lower part of the crotch and the back side portion, and the indicator portion It is composed of a coating part containing an agent that changes color by contact with moisture. The document also states that the back side area of the indicating part is provided with a low-visibility part that changes color compared to the other parts of the indicating part, and a high-visibility part compared to the low-visibility part. The high visibility department. Prior art literature Patent literature

Patent Document 1: Japanese Patent Laid-Open No. 2005-21390 Patent Document 2: Japanese Patent Laid-Open No. 2014-147433

The present invention relates to an absorbent article, which is provided with a liquid-permeable front sheet, a leak-proof sheet, and an absorbent body of an absorber located between the front sheet and the leak-proof sheet. The length direction corresponding to the front and back direction and the width direction orthogonal to the length direction, and have a ventral area placed on the wearer's ventral side during wearing, a dorsal area placed on the wearer's dorsal side, and located on the ventral side The area under the crotch between the area and the dorsal area. An indicator strip for notifying urination by a color change is arranged on the skin-facing surface side of the leak-proof sheet, and an exterior sheet made of non-woven fabric is arranged on the non-skin-facing surface of the leak-proof sheet. The outer covering sheet covers the non-skin-facing side of the area where the indicator strips are arranged in the absorbent body, and changes in thickness when changing ^{from a dry and unloaded state to a wet and pressurized state with a load of 0.5 N/cm 2} The rate is above 20% and below 75%.

Of course, the indicator part of the absorbent article has a high sensitivity, and sometimes it may change color even when there is only a small amount of excretion fluid such as urine. In this case, the wearer of the absorbent article or the caregiver may sometimes mistakenly believe that the replacement time of the absorbent article has arrived due to the discoloration of the indicator part from the outside, and remove the absorbent article to check the amount of excreted fluid. Or replace the absorbent article with a new absorbent article. That is, it is sometimes impossible to accurately grasp the appropriate replacement time of the absorbent article from the outside. Regarding this point, the disposable diapers described in Patent Documents 1 and 2 have not been studied at all.

The present invention relates to an absorbent article whose replacement period can be grasped from the outside.

Hereinafter, the absorbent article of the present invention will be described based on its preferred embodiment. Fig. 1 and Fig. 2 show an unfolded disposable diaper as a preferred embodiment of the absorbent article of the present invention (hereinafter, it is also abbreviated as "diaper"). Fig. 1 shows the structure when viewed from the side facing the skin of the diaper 1. The diaper 1 shown in this figure has a longitudinal direction X corresponding to the front and back directions of the wearer and extending from the wearer's abdominal side to the back through the crotch, and a width direction Y orthogonal to the diaper 1 in its unfolded and extended state. The diaper 1 has a ventral region F arranged on the ventral side of the wearer when worn, a dorsal region R arranged on the back side, and a subcrotch region M located between the ventral region F and the dorsal region R. Each region is a region obtained by dividing the full length of the diaper 1 into three equal parts in the length direction X, and extends continuously in the front and back directions of the wearer. The sub-crotch region M has an excretion part opposing part (not shown) that is arranged to face the excretion part of the wearer when the diaper 1 is worn.

As shown in Figures 1 and 2, the diaper 1 is provided with a liquid-permeable front sheet 2 that forms the opposite surface of the skin, and a leak-proof sheet that forms a non-skin-facing surface that is impervious to liquid (including water repellency) 3. The absorber 4 is arranged between the surface sheet 2 and the leak-proof sheet 3, and these members constitute the absorbent main body 1A. The front sheet 2 and the leak-proof sheet 3 each have a size larger than that of the absorber 4, and extend from the outer periphery of the absorber 4 to the outside. As shown in FIG. 1, the surface sheet 2 and the leak-proof sheet 3 extend from the both side edges of the absorber 4 in the longitudinal direction X to the outer side in the width direction Y. The both end edges in the longitudinal direction of each of the front sheet 2 and the leak-proof sheet 3 in this embodiment are substantially the same as the end edges in the longitudinal direction of the diaper 1.

As shown in FIG. 1 and FIG. 2, the diaper 1 is equipped with the absorber 4 of liquid retention. The absorber 4 shown in this figure is substantially rectangular, and its longitudinal direction is arrange|positioned so that it may correspond with the longitudinal direction X of a diaper. The absorber 4 is arranged from the abdominal region F to the dorsal region R. As shown in FIG. 2, the absorbent body 4 is formed by covering an absorbent core 41 having absorbent performance with a liquid-permeable core-covering material 42. The absorber 4 in the present embodiment has a portion that is retracted in the width direction Y in the sub-crotch region M. The both ends in the longitudinal direction of the absorbent body 4 are located more inside than the both ends in the longitudinal direction of the diaper 1.

In this specification, the "unfolded and stretched state" of the diaper 1 means that the diaper 1 is set to the unfolded state, so that the elastic members of each part of the diaper 1 in the unfolded state are stretched and expanded to the design size (and the influence of the elastic member is completely excluded The size is the same when it expands into a flat shape in the state.). In addition, when focusing on the diaper or its constituent members (such as absorbers), the "skin facing side" refers to the side facing the wearer's skin when wearing the diaper, and the "non-skin facing side" refers to the side facing the wearer's skin when wearing the diaper. Wear on the opposite side of the author’s skin. That is, the skin facing surface refers to the side relatively close to the wearer's skin, and the non-skin facing surface refers to the side relatively far away from the wearer's skin. "While wearing" and "wearing state" refer to the state in which the diaper is being worn while being maintained in a proper wearing position.

As shown in FIGS. 1 and 2, the diaper 1 is provided with an indicator strip 1D, which changes color in contact with moisture, and informs urination by the change in color. The indicator strip 1D is arranged on the skin-facing surface side of the leak-proof sheet 3, and is arranged in such a way that the liquid absorbed by the absorber 4 can contact the indicator strip 1D. The indicator strip 1D is preferably arranged to be in contact with the absorbent body. Furthermore, it is preferable that the indicator bar 1D is arranged at least in the sub-crotch area M. In the embodiment shown in FIG. 1, a plurality of indicator bars 1D are arranged so as to extend in the longitudinal direction X across the ventral region F and the dorsal region R via the subcrotch region M. The indicator strips 1D are arranged side by side in the central area of the diaper 1 in the width direction Y. The indicator bars 1D shown in FIG. 2 are shown as having different basis weights, but they are shown as such for convenience of explanation, and can be formed as having different basis weights as shown in the figure, or alternatively, having the same basis weights.

The so-called "color change" and "color change" here include not only the state of changing from a certain color to another color, but also the so-called "color development" from the colorless state to the colored state, and the change from the color state It is the so-called "color reduction" in the colorless state. The discoloration of the indicator strip 1D can be visually confirmed by the wearer or the caregiver or caregiver of the wearer to visually confirm the discoloration of the indicator strip 1D to roughly estimate the replacement time of the diaper 1.

As the indicator strip 1D, those containing colored materials that change color by contact with excrement containing moisture such as urine and sweat can be used, and those previously used as indicator strips in such absorbent articles can be suitably used. As the colored material constituting the indicator bar, for example, a mixture of a pH indicator and an oxidizing compound can be used.

As shown in FIG. 2, the non-skin facing surface side of the absorptive main body 1A is arrange|positioned with the exterior sheet|seat 5 which consists of a nonwoven fabric. The outer covering sheet 5 is a member forming the outer surface of the diaper 1 that can be viewed from the outside when the diaper 1 is worn. The periphery of the outer covering sheet 5 forms an abdominal area F, a crotch area M, and a back area R. The outline of the person. The exterior sheet 5 is arranged on the non-skin facing surface side of the leak-proof sheet 3 from the abdominal region F to the back region R in the longitudinal direction X. As shown in the figure, the exterior sheet 5 covers the non-skin-facing surface side of the area where the indicator strip 1D is arranged in the absorbent main body 1A (hereinafter, this area is also referred to as the "instruction area"). The exterior sheet 5 is configured such that the indicator strip 1D arranged on the skin-facing surface side of the exterior sheet 5 can be viewed from the non-skin-facing surface side.

One of the characteristics of the exterior sheet 5 arranged in the present invention is to use the following non-woven fabric: the thickness change rate of the thickness in a dry and unloaded state and the thickness in a wet and pressurized state is within a specific range. By using this kind of non-woven fabric, the visibility of the indicator bar is low right after the diaper is worn, and the visibility of the indicator bar becomes higher after absorbing the excrement, so it is easy to grasp the diaper replacement time from the outside.

In detail, the percentage change in thickness of the exterior sheet 5 from a dry and unloaded sheet to a wet and ^{pressurized state with a load of 0.5 N/cm 2 is} preferably 20% or more, more preferably It is 30% or more, more preferably 40% or more, more preferably 75% or less, more preferably 70% or less, and still more preferably 65% or less. In the following description, unless otherwise specified, ^{the state of being pressurized with a load of 0.5 N/cm 2 is} also simply referred to as "pressurized state".

The dry state of the exterior sheet 5 means that the water content in the sheet does not reach 10% by mass. The wet state of the exterior sheet 5 means that the water content in the sheet is 60% by mass or more. The water content in the sheet can be measured using, for example, a water content measuring device (manufactured by A&D Co., Ltd., MS-70).

The thickness change rate of the exterior sheet 5 can be measured by the following method. That is, under an environment of 23° C. and 50% RH (relative humidity), using a thickness measuring device (manufactured by KEYENCE, LK-080), 0.05 kPa (0.005 N/cm ² ) is applied to the exterior sheet 5 Under the load state, measure the thickness at 5 points or more, and set the arithmetic average value of them as the "thickness a (mm) in a dry and unloaded state". Next, the thickness of the outer packaging sheet 5 that has been wetted and pressurized is measured by the same procedure, and the arithmetic average value thereof is set as "thickness b (mm) in a wet and pressurized state". The dry and unloaded sheet used for the measurement is used. Take out the evaluation object outside loading sheet 5 by using cold spray or other methods such as peeling off the absorbent article, and cut the taken out sheet into about 10 After the size of cm square, put the cut sheet in 23℃, 50%RH environment for more than 12 hours. In addition, the wet and pressurized sheet used for the measurement is to use a dry and unloaded sheet on a fibrous body such as Kimtowel (manufactured by NIPPON PAPER CRECIA) that contains moisture, and then apply it to the sheet The load is 0.5 N/cm ^{2 and} the weight is laminated on the sheet with the acrylic plate interposed therebetween, and the sheet is pressurized. Regarding the measurement of the thickness of the sheet in a wet and pressurized state, the sheet was taken out after 10 minutes of the pressurization described above, and the thickness measurement was performed by the method described above within 15 seconds. Calculate the percentage of thickness change based on the measured thickness and the following formula (A), and use it as the thickness change rate (%). Thickness change rate (%)=100×(thickness in wet and pressurized state b[mm])/(thickness in dry and unloaded state a[mm]) ・・・ (A)

From the viewpoint of balancing the visibility and concealment of the indicator bar, the thickness a of the exterior sheet 5 in a dry and unloaded state is preferably 0.3 mm or more, more preferably 0.5 mm or more, and even more preferably 0.7 mm or more, more preferably 2.5 mm or less, more preferably 2 mm or less, and still more preferably 1.5 mm or less.

From the viewpoint of improving the visibility of the indicator bar, the thickness b of the exterior sheet 5 in a wet and pressurized state is preferably 0.1 mm or more, more preferably 0.2 mm or more, and still more preferably 0.3 mm or more, and, It is preferably 2 mm or less, more preferably 1.5 mm or less, and still more preferably 1 mm or less.

As shown in Figs. 1 and 2, a pair of leak-proof cuffs 6, 6 may also be provided on both sides of the skin-facing surface of the diaper 1 along the longitudinal direction X. The leak-proof cuff 6 is composed of a water-repellent and air-permeable sheet 61 for forming a leak-proof cuff. In the vicinity of the free end of each leak-proof flanging 6, more than one linear leak-proof flanging forming elastic member 62 is arranged in an extended state in the longitudinal direction X. The leak-proof cuff 6 shrinks when the diaper 1 is worn by the elastic member 62 arranged in the stretched state, and stands up at least in the crotch region M, thereby preventing excrement such as urine from flowing out of the width direction Y.

The outer covering sheet 5 may extend from both sides of the absorbent body 1A along the longitudinal direction X to the outside of the width direction Y, and can be formed together with the leak-proof cuff forming sheet 61 that constitutes the leak-proof cuff 6 Flank section S. The side wing portion S is formed in a pair in the ventral region F and the dorsal region R, respectively. Instead, each side flap S may be configured to further include members extending from the absorber 4 to the outer side in the width direction Y, such as the front sheet 2 and the leak-proof sheet 3.

As shown in FIG. 1, the diaper 1 of this embodiment is provided with a pair of hook-and-loop fasteners 7, 7 in each side flap part S formed in the back side area|region R, respectively. Each hook and loop fastener 7 is arranged so as to extend from both side edges in the width direction Y of each back side flap.

Moreover, as shown in FIG. 1, on the non-skin facing surface in the abdominal region F of the diaper 1, there is provided a fastener tape as a fixed region that can be freely attached and detached and fixed by the fixing portion 71 of the hook and loop fastener 7 72. For the fastening tape 72, an appropriate material can be selected according to the material of the fixing portion 71 of the hook-and-loop fastener 7. For example, when the fixing portion 71 is a male material of a mechanical fastener, as the fastening tape 72, a fiber sheet that can be fastened with the male material, such as a woven fabric or a non-woven fabric, can be used as the base material of the mechanical fastener. In addition, when the fixing portion 71 is an adhesive, as the fastening tape 72, for example, a smooth film made of synthetic resin can be used.

As shown in FIG. 1, on both sides of the diaper 1 along the longitudinal direction X, a plurality of leg elastic members 85 for forming leg gathers are arranged in an extended state along the longitudinal direction X. The leg elastic members The contraction of 85 can form leg folds. In this embodiment, there is no elastic member in each of the longitudinal end regions of the abdominal region F and the back region R of the diaper 1. However, as long as the effect of the present invention can be achieved, for example, it may be further in the width direction Y The elastic member is arranged in an extended state, and the waist folds can be formed by the contraction of the elastic member.

As the top sheet 2, the leak-proof sheet 3, and the absorber 4, those previously used for absorbent articles can be used without particular limitation, respectively. As the surface sheet 2, for example, a liquid-permeable non-woven fabric, an apertured film, etc. can be used. As the leakage prevention sheet 3, on the premise that the indicator strip 1D can be viewed from the outside, a resin film that is impermeable to liquid, a laminate sheet of a resin film and a non-woven fabric, or the like can be used. In the absorbent body 4, as the absorbent core 41, an aggregate of hydrophilic fibers such as wood pulp and synthetic fibers subjected to hydrophilization treatment, or an aggregate formed by holding a water-absorbent polymer can be used. In addition, as the core-coated sheet 42, the same one as that of the surface sheet 2 can be used. Moreover, as the sheet 61 for forming a leak-proof cuff formation, a water-repellent non-woven fabric can be used.

Moreover, as the exterior sheet 5, it is presumed that the indicator bar 1D can be viewed from the outside, and it is preferable to use a non-stretchable sheet having no stretchability. For the exterior sheet 5, for example, a non-woven fabric manufactured by various manufacturing methods using synthetic resins such as polypropylene or polyethylene terephthalate as a raw material. Specifically, as the exterior sheet 5, for example, hot-air nonwoven fabric, spunlace nonwoven fabric, hot rolled nonwoven fabric, meltblown nonwoven fabric, hydrophilic nonwoven fabric containing synthetic fibers obtained by imparting hydrophilicity to synthetic fibers as constituent fibers, or Laminated non-woven fabrics and so on. These non-woven fabrics may further include at least one of hydrophilic synthetic fibers obtained by imparting hydrophilicity to synthetic fibers or hydrophilic natural fibers such as cotton as their constituent fibers. In addition, these non-woven fabrics may be subjected to fluffing treatment such as hot air recovery treatment. The exterior sheet 5 may be composed of one sheet as shown in FIG. 2 or, instead, may be composed of a laminate of a plurality of sheets.

Among them, from the viewpoint of increasing the rate of change of the sheet thickness during drying and when wet, and further improving the visibility of the indicator bar in a wet and pressurized state, the exterior sheet 5 is preferably Use at least one of hot-air non-woven fabric, hot-air non-woven fabric subjected to hot-air recovery treatment, non-woven fabric containing hydrophilic synthetic fibers obtained by imparting hydrophilicity to synthetic fibers, and non-woven fabric containing hydrophilic natural fibers such as cotton.

According to the absorbent article of the present invention having the above constitution, by using an outer covering sheet with a specific thickness change rate, the outer covering sheet can be used in a dry and unloaded state equivalent to just after wearing the diaper. The thickness of the indicator is easy to hide the indicator bar, so the visibility of the indicator bar from the outside is low. In addition, after wearing the diaper, the degree of wet and pressurized state gradually increases with the presence of water vapor from excretion fluids such as sweat and urine, or the load of external pressure caused by the contact between the diaper and the clothes. Therefore, as the wearing time elapses, the thickness of the outer covering sheet gradually becomes thinner. As a result, the visibility of the indicator bar observed through the outer covering sheet 5 gradually improves as the wearing time elapses. In this way, after the absorbent article of the present invention is worn, the visibility of the indicator bar gradually improves over time, so there is no need to specifically remove the diaper from the wearer for confirmation, and it can be easily and externally Accurately grasp the arrival of the appropriate diaper replacement time.

From the standpoint of making the above effect more pronounced, when the indicator area is formed by at least two indicator strips 1D, when focusing on the two indicator strips 1D, the thickness of the exterior sheet 5 is preferable The average thickness of the part overlapping with one indicator strip 1D, that is, the first indicator strip, in the direction Z is different from the average thickness of the part overlapping with another indicator strip 1D, that is, the second indicator strip in the thickness direction. When three or more indicator bars 1D are arranged, when focusing on two of the arranged indicator bars 1D, only the average thickness of the part overlapping the first indicator bar in the thickness direction Z and the thickness It is only necessary that the average thickness of the part overlapping with the second indicator bar in the direction is different. In detail, based on the premise that the average thicknesses of the first and second indicator bars are different, the average thickness of the area overlapping with other indicator bars in the thickness direction Z may be the same as the average thickness of the first indicator bar, or different. Also, in the same way, the average thickness of the portion overlapping with other indicator bars in the thickness direction Z may be the same as or different from the average thickness at the second indicator bar. Alternatively, the average thickness of the part overlapping with at least one indicator bar 1D in the thickness direction Z and less than the total number may be different from the average thickness of the part overlapping with other indicator bars 1D in the thickness direction.

In order to become such an exterior sheet 5, for example, as shown in FIG. 3, it is possible to form a plurality of protruding strips 51 protruding from the skin-facing surface side of the exterior sheet 5 toward the non-skin-facing surface side and located The concave strip portion 52 between the convex strip portions 51 differs in the average thickness of the outer covering sheet 5 in the portion overlapping the indicator strip 1D in the thickness direction. In the embodiment shown in the figure, one indicator strip 1D (first indicator strip) overlaps the convex strip portion 51 in the thickness direction, and the other indicator strip 1D (second indicator strip) overlaps the concave strip portion 52 in the thickness direction. Overlap in the thickness direction. That is, the outer covering sheet 5 of the present embodiment makes the average thickness of the convex strip portion 51 higher than the average thickness of the concave strip portion 52, so that the outer covering sheet 5 overlaps with the indicator strip 1D in the thickness direction. The average thickness of 5 is different. In the embodiment shown in the figure, the indicator bar 1D except for the first and second indicator bars is the same as the first indicator bar, and overlaps with the protruding bar portion 51 in the thickness direction. The indicator bars 1D shown in FIG. 3 are shown as having different basis weights, but they are shown as such for convenience of explanation, and can be formed as having different basis weights as shown in the figure, or alternatively, having the same basis weights.

The ridge portion 51 shown in the figure is formed by the exterior sheet 5 protruding from the skin-facing surface side of the diaper 1 toward the non-skin-facing surface side. The exterior sheet 5 is adhered to the leak-proof sheet 3 via the adhesive 5a at the location where the concave strip portion 52 is formed. The convex strip portion 51 shown in the figure is formed so as to protrude away from the leak-proof sheet 3, and the area of the convex strip portion 51 divided by the exterior sheet 5 and the leak-proof sheet 3 is hollow. On the other hand, both the leak-proof sheet 3 and the concave strip portion 52 are substantially flat. The plurality of protruding strip portions 51 and recessed strip portions 52 may be respectively formed in the shape of scattered dots, or may also be formed as ridges having ridge-shaped protruding strip portions 51 and groove-shaped concave strip portions 52 that extend in one direction alternately. shape.

The exterior sheet 5 may be formed of a single layer as shown in FIGS. 2 and 3, or alternatively, may be formed by laminating a plurality of sheets. In detail, instead of the form shown in FIG. 3, the exterior sheet 5 may be composed of two non-woven fabrics intermittently joined at a plurality of locations in the width direction Y of the diaper 1, and one of the two non-woven fabrics The part that is not joined to the other non-woven fabric protrudes in the direction away from the other non-woven fabric to form the ridge portion 51. In this case, the convex strip portion 51 is preferably a hollow area divided by one non-woven fabric and the other non-woven fabric. In addition, the two non-woven fabrics may each independently have a single-layer structure or a two- or more-layer laminated structure. The protruding strip portion 51 may have a low-density portion inside the protruding strip portion with a fiber density lower than the surface portion of the protruding strip portion, instead of between the exterior sheet 5 and the leak-proof sheet 3, or forming an exterior sheet A hollow part is formed between the two non-woven fabrics of the material 5.

By having such a configuration, the indicator strip 1D existing at the position overlapping with the recessed strip portion 52 in the thickness direction is because the average thickness of the portion where the recessed strip portion 52 exists in the exterior sheet 5 is thin. It can be easily recognized even in the presence of a small amount of excretion fluid, so the presence and amount of excretion fluid can be recognized early. In addition, the indicator strip that exists at the position overlapping with the ridge portion 51 in the thickness direction is because the hollow structure of the ridge portion 51 formed in the exterior sheet 5 is maintained immediately after the diaper 1 is worn, and the average thickness is relatively thick. , It is difficult to recognize the indicator bar from the outside. In a wet and pressurized state, as the wearing time elapses, the protruding strip 51 is squashed, and the average thickness of the protruding strip 51 of the exterior sheet 5 gradually becomes thinner. Therefore, the visibility of the indicator strip is gradually reduced. improve. As a result, it is possible to more easily and accurately grasp the arrival of the appropriate replacement time of the diaper.

The average thickness of the protruding strip portion 51 can be set as the distance H1 (hereinafter, also referred to as the distance H1) between the surface of the exterior sheet 5 where the concave strip portion 52 is formed and the top surface of the protruding strip portion 51 in a dry and unloaded state Call it "height H1"). In addition, the average thickness of the grooved portion 52 can be the thickness D1 of the exterior sheet 5 in a dry and unloaded state (hereinafter, this is also referred to as "thickness D1").

The height H1 (refer to FIG. 3) of the protruding strip portion 51 is preferably 0.2 mm or more, more preferably 0.4 mm or more, more preferably 3 mm or less, and still more preferably 2 mm or less. The full width W1 (refer to FIG. 3) of the ridge portion 51 along the width direction Y is preferably 0.2 mm or more, more preferably 0.4 mm or more, more preferably 12 mm or less, and still more preferably 6 mm or less . In addition, the full width W2 (refer to FIG. 3) of the concave portion 52 along the width direction Y is preferably 0 mm or more, more preferably 0.2 mm or more, more preferably 5 mm or less, and more preferably 2 mm or less.

The above-mentioned height H1, full width W1, and full width W2 can be measured by, for example, the following method. That is, the sample formed with the convex stripe portion 51 and the concave stripe portion 52 is cut with a sharp razor in a direction orthogonal to the extending direction of the convex stripe portion 51 and the concave stripe portion 52, and the cut surface is observed to measure the formation The shortest distance between the surface of the concave strip portion 52 and the top upper surface of the convex strip portion 51 is the obtained value as the height H1 of the convex strip portion. In the above-mentioned cut surface, according to the contour line in the non-skin facing surface of the convex stripe portion 51 and the concave stripe portion 52, the boundary point between the convex stripe portion 51 and the concave stripe portion 52 is specified, and the convex stripe portion The shortest distance between the junction points measured by the method 51 (refer to Figure 3) is set to the full width W1, and the shortest distance between the junction points measured by the method of separating the concave strip portion 52 (refer to Figure 3) is set to the full width Wide W2. The junction point refers to the junction point from the convex shape to the straight line extending along the contour line of the concave portion, and the junction point from the straight line to the convex shape as viewed in the cut surface. The junction point It can be specified by finding the inflection point based on the tangent line drawn with respect to the above-mentioned contour line of the convex strip portion 51 and the concave strip portion 52. When the boundary point cannot be specified, the intersection of the imaginary straight line connecting the midpoints of the height H1 of each ridge portion 51 and the contour line in the non-skin facing surface of the ridge portion 51 is set as the boundary point for measurement , Set the measured shortest distance between the junction points to the full width W1, and the full width W2 to zero. In addition, when an external force acts on the outer packaging sheet of the measurement object for a long time, specifically, for example, when it is assembled into an absorbent article such as a disposable diaper, and the absorbent article is compressed and filled into the package, it is stored In this case, in order to eliminate the influence of the external force, the outer covering sheet is taken out of the absorbent article, and the outer covering sheet is cut with a razor as described above when it is left in an environment of normal temperature and normal pressure for more than one day.

Hereinafter, take the case where the outer covering sheet 5 is formed in a manner of extending in the longitudinal direction of the diaper 1 to form a ridge shape in which ridge-like protruding strip portions 51 and groove-like recessed strip portions 52 extending in one direction are alternately formed as For example, the manufacturing method will be described. First, one side of the long strip of leak-proof sheet 3 extends in the conveying direction of the leak-proof sheet 3, preferably in the direction along the conveying direction of the leak-proof sheet 3. In this way, a plurality of adhesives are applied in a strip shape. That is, on the leak-proof sheet 3, adhesives are alternately formed in a direction crossing the conveying direction of the leak-proof sheet 3, preferably in a direction orthogonal to the conveying direction of the leak-proof sheet 3. The coated part of the agent and the non-coated part where the adhesive is not attached.

Then, in a state where tension is applied in the same direction as the conveying direction of the leak-proof sheet 3, the leak-proof sheet 3 coated with the adhesive and the long strip-shaped outer packaging sheet 5 are bonded together. At this time, the tension applied to the exterior sheet 5 is set to the same direction as the conveying direction of the leak-proof sheet 3, and set to a state higher than the tension when the leak-proof sheet 3 is conveyed (hereinafter, this state will also be used) Called "high tension state"). Since the outer cover sheet 5 in a high tension state is stretched in the conveying direction compared to the outer cover sheet 5 without tension, the outer cover sheet 5 is attached to the leak-proof sheet 3 in a state where the width of the outer cover sheet 5 is reduced. Together.

After that, the tension applied to the bonding sheet becomes the tension at the time of conveying the leak-proof sheet 3, and then it is conveyed to the downstream step. Since the tension applied to the exterior sheet 5 after bonding the sheets to each other is lower than the tension applied to the exterior sheet 5 before bonding the sheets to each other, the high tension state of the exterior sheet 5 is released. Thereby, the width of the outer covering sheet 5 is restored in a manner expanding in the width direction Y, and the outer covering sheet 5 located in the non-coating portion protrudes away from the leak-proof sheet 3, and becomes along the adhesive The ridges 51 extending in the coating direction. In addition, the packaging sheet 5 located outside the coating portion is not separated from the leak-proof sheet 3 but is fixed, so the packaging sheet 5 located outside the coating portion becomes a recessed portion extending along the application direction of the adhesive 52. In this way, a ditch shape extending in one direction is formed on the exterior sheet 5.

In addition, in the case of forming a ridge shape in the width direction of the diaper 1 in which ridge-like protruding strips 51 and groove-like recessed strips 52 are alternately formed in one direction, for example, as long as a long strip is formed One side of the leak-proof sheet 3 extends in a direction crossing the conveying direction of the leak-proof sheet 3, preferably in a direction orthogonal to the conveying direction of the leak-proof sheet 3 , Apply a plurality of adhesives in a strip shape, and then attach the external loading sheet 5 in a high tension state. In the case of manufacturing the diaper 1 in which the furrow shape is arranged to extend in the width direction, as long as the width direction of the target diaper 1 is consistent with the extending direction of the furrow shape, the bonding sheet including the exterior sheet 5 The material is cut, and the diaper 1 can be formed.

In addition, regarding the relationship between the extending direction of the ditch shape and the extending direction of the indicator strip, for example, the outer covering sheet 5 may be arranged in a state where the extending direction of the ditch shape coincides with the extending direction of the indicator strip, and the diaper 1 may be formed. The exterior sheet 5 is arranged in a state where the extending direction of the ridge shape and the extending direction of the indicator bar are intersected, and the diaper 1 is formed. From the viewpoint of more effectively taking into account the concealment of the indicator bar in a dry and unloaded state and the improvement of the visibility of the indicator bar in a wet and pressurized state, it is preferable to use the extending direction of the ditch shape and the extension of the indicator bar The diaper 1 is formed in such a way that the directions coincide with each other.

In the case where the outer covering sheet 5 composed of a plurality of sheets is formed into a furrow shape, for example, the inner layer side sheet of the outer covering sheet 5 constituting the diaper 1 is coated in a strip shape A plurality of adhesives are then adhered to the inner layer side sheet and another sheet in a high tension state. After that, it is only necessary to release the high tension state of the other sheet and form a furrow shape on the other sheet. The outer cover sheet 5 of this embodiment preferably uses a hot-air nonwoven fabric or a nonwoven fabric containing hydrophilic fibers for at least the other sheet.

From the same point of view, it is also preferable to use a sheet with a high basis weight area with a basis weight higher than other parts for the exterior sheet 5 instead of an exterior sheet with protruding strips 51 and recessed strips 52 5. In the embodiment shown in FIG. 4, the exterior sheet 5 is formed with a plurality of high basis weight regions 53 in the planar direction. The high basis weight area 53 is a portion having a higher basis weight than the portion in the exterior sheet 5 where the high basis weight area 53 is not formed. That is, the exterior sheet 5 in this embodiment has a high basis weight area 53 and a low basis weight area 54 located around it. Regarding the outer covering sheet 5 having the high basis weight area 53 and the low basis weight area 54, for example, the outer covering sheet 5 is formed of a non-woven fabric, and a pair of concave-convex rollers that can be meshed with each other are used to partially extend the processing. A low basis weight region 54 can be formed, and a portion that is not partially extended can be set as a high basis weight region 53. Regarding the high basis weight region 53 and the low basis weight region 54, as long as the following ratio of existence is satisfied, there is no particular limitation on the configuration. For example, they can be in a continuous line along the extending direction of the indicator bar 1D or the direction intersecting the direction Or it may be arranged in a discontinuous line, or it may be formed in a scattered dot shape, or it may be formed in the entire sheet. The indicator bars 1D shown in FIG. 4 are shown as having different basis weights, but they are shown as such for convenience of explanation, and can be formed as having different basis weights as shown in the figure, or alternatively, having the same basis weights.

The high basis weight area 53 and the low basis weight area 54 formed in the exterior sheet 5 can be measured based on, for example, the following method. That is, 10 small pieces are cut out for each of the high basis weight area 53 and the low basis weight area 54, and the mass of each is measured using an electronic balance, and the average value of the weight of the 10 small pieces is divided by the area of the 10 small pieces Calculate the average value, and set the obtained value as the basis weight.

In addition, when there are more than two indicator bars 1D, it is also preferable to have a high basis weight area 53 at a position overlapping an indicator bar 1D (first indicator bar 1D) in the thickness direction Z The ratio is different from the existence ratio of the high basis weight region 53 existing in the position overlapping with another indicator strip 1D (second indicator strip 1D) in the thickness direction. "The existence ratio of the high basis weight area 53 is different" includes the following two aspects: the high basis weight area 53 exists at a position overlapping with one indicator strip 1D in the thickness direction, but is different from another indicator strip in the thickness direction There is no high basis weight area 53 at the position where the 1D overlaps; and the high basis weight area 53 exists at the position where the 1D overlaps with each indicator strip 1D in the thickness direction, but their existence ratios are different. As the former aspect, for example, as long as the outer covering sheet 5 is alternately formed with high basis weight regions 53 and low basis weight regions 54 extending in one direction, so that the extension direction of each basis weight region 53, 54 is indicated The extending direction of the strip 1D is in the same state, and it is only necessary to arrange it in such a way that there is a high basis weight area 53 at a position overlapping the indicator strip 1D in the thickness direction Z.

When three or more indicator bars 1D are arranged, when focusing on 2 of the arranged indicator bars 1D, only the high basis weight area 53 of the position overlapping with the first indicator bar in the thickness direction Z The existence ratio may be different from the existence ratio of the part overlapping with the second indicator bar in the thickness direction. In detail, on the premise that the existence ratios of the high basis weight regions 53 at the first and second indicator bars are different, the existence ratio of the area overlapping with other indicator bars in the thickness direction Z can be the same as that at the first indicator bar. The existence ratio is the same or different. Also, in the same way, the existence ratio of the portion overlapping with other indicator bars in the thickness direction Z may be the same as or different from the average thickness at the second indicator bar. Alternatively, in the thickness direction Z, the ratio of the existence of the high basis weight region 53 overlapping with at least one or more indicator bars 1D and less than the total number of indicator bars 1D may be higher than that of the area overlapping with other indicator bars 1D in the thickness direction. The existence ratio of the basis weight region 53 is different.

Regarding the existence ratio of the high basis weight area 53 overlapping the indicator bar 1D in the thickness direction Z, for example, light can be irradiated to the sheet on which the high basis weight area 53 is formed, and the position where the difference in light transmittance occurs can be determined by visual observation For the location where the high basis weight area 53 and the low basis weight area 54 exist, use transparent film such as OHP (overhead projector) sheet to capture each area, and measure the area of each area. Thereafter, the obtained value of the area of the high basis weight area is divided by the coated area of the indicator bar 1D, and the obtained value is calculated as a percentage of the obtained value.

On the condition that the existence ratio of the high basis weight region 53 existing in the position overlapping with the indicator strip 1D in the thickness direction Z is different from the portion overlapping with at least two indicator strips 1D, it can be 0% (that is, substantially no Exist), or more preferably 50% or more, more preferably 70% or more, more preferably 100% or less, and more preferably 95% or less. The indicator strip 1D existing in the position where the existence ratio of the high basis weight region 53 is high is difficult to visually recognize immediately after the diaper 1 is worn.

With this configuration, the indicator bar 1D existing at the position overlapping with the low basis weight area 54 in the thickness direction has less fiber content in the low basis weight area 54 than in the high basis weight area 53, so even in The presence of a small amount of excretion fluid can be easily recognized, so the presence and amount of excretion fluid can be recognized early. In addition, the indicator strip 1D existing at the position overlapping with the high basis weight region 53 in the thickness direction is covered by the high basis weight region 53 with a large amount of fibers immediately after the diaper 1 is worn, and the indicator strip is difficult to see. In the wet and pressurized state, as the wearing time passes, the high basis weight area 53 is gradually squashed, so the visibility of the indicator bar is gradually improved. As a result, it is possible to more easily and accurately grasp the arrival of the appropriate replacement time of the diaper.

In addition, from the same viewpoint, it is also preferable to use the outer covering sheet 5 having a plurality of openings 55 penetrating in the thickness direction as shown in FIG. 5 instead of the above-mentioned outer covering sheet 5 . In the embodiment shown in the figure, the exterior sheet 5 is formed with a plurality of openings 55 penetrating in the thickness direction thereof. The outer cover sheet 5 having a plurality of openings can be perforated in a specific area by, for example, feeding the non-woven fabric constituting the outer cover sheet 5 between a roller having a plurality of perforation needles on the peripheral surface and an anvil roller. Alternatively, the ratio at which the processing is performed is changed in the plane direction of the sheet, so that the opening 55 is formed. Regarding the opening portion 55, as long as the following ratio of existence is satisfied, the arrangement form is not particularly limited. For example, it may be arranged in a row along the extending direction of the indicator bar 1D or in a direction intersecting the direction, or may be formed in scattered dots , Or can also be formed in the whole area of the sheet. The indicator bars 1D shown in FIG. 5 are shown as having different basis weights, but they are shown as such for convenience of explanation, and can be formed as having different basis weights as shown in the figure, or alternatively, having the same basis weights.

In addition, when there are two or more indicator bars 1D, it is also preferable that the ratio of the existence of the openings 55 existing in the position overlapping with one indicator bar 1D in the thickness direction Z and the presence in the thickness direction The existence ratio of the opening 55 at the position where the upper and the other indicator bar overlaps is different. "The existence ratio of the opening 55 is different" includes the following two aspects: the opening 55 exists at a position overlapping with one indicator strip 1D in the thickness direction, but overlaps with another indicator strip 1D in the thickness direction There is no opening 55 at the position of, and there are openings 55 at the positions overlapping with each indicator strip 1D in the thickness direction, but their existence ratios are different. As the former aspect, for example, it is only necessary to form a plurality of openings 55 in a row extending in one direction and the outer packaging sheet 5 so that the extending direction of the rows of the openings 55 is consistent with the extending direction of the indicator bar 1D It is sufficient to arrange the hole 55 at a position overlapping with the indicator bar 1D in the thickness direction Z.

When three or more indicator bars 1D are arranged, when focusing on two of the arranged indicator bars 1D, only the presence of the opening 55 at the position overlapping the first indicator bar in the thickness direction Z The ratio may be different from the existing ratio of the portion overlapping with the second indicator bar in the thickness direction. In detail, on the premise that the existence ratios of the openings 55 at the first and second indicator bars are different, the existence ratio of the portion overlapping with other indicator bars in the thickness direction Z may be the same as that at the first indicator bar. The existence ratio is the same or may be different. Also, in the same way, the respective existence ratios of the opening portions 55 at the positions overlapping with other indicator bars in the thickness direction Z may be the same as or different from the existence ratios at the second indicator bar. Alternatively, in the thickness direction Z, the ratio of the openings 55 at the location where at least one or more indicator bars 1D overlap with the total number of indicator bars 1D may be the same as that of the location where the indicator bars 1D overlap with other indicator bars 1D in the thickness direction. There are different ratios.

Regarding the existence ratio of the opening 55 overlapping with the indicator bar 1D in the thickness direction Z, for example, using a microscope (manufactured by KEYENCE, VHX-1000) to observe the overlap with the indicator bar 1D in the thickness direction Z at a magnification of 20 to 100 times For the openings 55, the areas of the openings at 5 or more points are measured respectively, and the arithmetic average of these is set as the opening area of the openings. In addition, the number of openings existing at the position overlapping with the indicator bar 1D was measured by the same observation method. Divide the value obtained by multiplying the obtained opening area by the number of openings by the coated area of the indicator bar, and set the percentage of the obtained value as the existence ratio.

Regarding the existence ratio of the openings 55 existing in the position overlapping with the indicator strip 1D in the thickness direction Z, it may be 0% (that is, substantially Not present), or preferably 5% or more, more preferably 10% or more, more preferably 50% or less, and still more preferably 40% or less. The indicator strip 1D which exists in the position where the existence ratio of the opening part 55 is small is hard to be recognized immediately after wearing the diaper 1.

The above embodiment is an example in which some processing is applied to the non-woven fabric constituting the outer cover sheet 5, but it can also be used to form an absorbent article other than the outer cover sheet 5 The material is processed, or instead of processing the constituent materials of the absorbent article other than the non-packing sheet 5, the visibility of the indicator bar 1D from the outside of the article is gradually changed. Even with such a configuration, the effects of the present invention can be fully exhibited. Regarding the embodiment to be described below, the description will focus on the differences from the above-mentioned embodiment, and the description of the above-mentioned embodiment can be appropriately applied to the parts that are not specifically described.

In the embodiment shown in FIG. 6, the exterior sheet 5 is formed in a position where it overlaps the area where the indicator strip 1D is arranged in the thickness direction Z, and is recessed from the non-skin facing side toward the skin facing side Sheet recess 58. In addition, at a position overlapping the sheet depressed portion 58 in the thickness direction, an absorbent body depressed portion 4A in which the absorbent body 4 is depressed from the non-skin facing surface side toward the skin facing surface side is formed. In the present embodiment, the outer cover sheet 5 is recessed along the shape of the absorbent body recessed portion 4A in a dry and unloaded state to form a sheet recessed portion 58. The indicator strips 1D shown in FIG. 6 are shown as having different basis weights, but they are shown as such for convenience of explanation, and can be formed as having different basis weights as shown in the figure, or alternatively, having the same basis weights.

The absorbent core recessed portion 4A shown in FIG. 6 is a low-fiber accumulation portion where the basis weight of the material forming the absorbent core 41 is less than that of other parts. Alternatively, there is no non-fiber accumulation part of the material forming the absorbent core 41. When focusing on one absorbent body recessed portion 4A, the absorbent body recessed portion 4A may be formed by only one of the low fiber accumulation portion and the non-fiber accumulation portion, or a mixture of both the low fiber accumulation portion and the non-fiber accumulation portion State formation. In addition, when there are a plurality of absorbent body depressed portions 4A, they may be formed of only one of the low fiber accumulation portion and the non-fiber accumulation portion, or may be any combination of the low fiber accumulation portion and the non-fiber accumulation portion. In addition, in this specification, even when the absorbent body recessed portion 4A composed of a non-fiber accumulation portion and the indicator strip 1D overlap in the thickness direction, the indicator strip 1D is also arranged on the absorbent body 4 and the leak-proof sheet 3 between.

The absorbent body recessed portion 4A only needs to be formed at least at a position overlapping the indicator strip 1D in the thickness direction. For example, it can be arranged in a continuous line or a discontinuous line along the extending direction of the indicator strip 1D or a direction intersecting the direction. Shape, or can also be formed into scattered dots.

The elastic member (not shown) extending in the length direction X or the width direction Y of the diaper 1 is arranged in an extended state in the sub-crotch region M instead of the above-mentioned form, or in addition to the above-mentioned configuration, it is also extended in the sub-crotch region M The elastic member (not shown) arranged in the longitudinal direction X or the width direction Y of the diaper 1 may form a sheet recess 58 at a position overlapping the area where the indicator strip 1D is arranged in the thickness direction Z. That is, the sheet recess 58 is formed by the contraction of the elastic member. The extension direction of the indicator bar 1D and the contraction direction of the above-mentioned elastic member preferably cross each other, and more preferably are orthogonal to each other. With this arrangement, when the elastic member is contracted, the sheet-shaped recessed portion 58 extends in a direction crossing the contraction direction, so that the concealment of the sheet-shaped recessed portion 58 from the indicator bar can be further improved.

By forming the sheet recessed portion 58 in the outer covering sheet 5, the appropriate thickness of the outer covering sheet 5 itself matches with the sheet recessed portion 58 in the state immediately after wearing the diaper and in a state where a small amount of excreted fluid is absorbed and retained , It is easy to hide the indicator bar, so the visibility of the indicator bar from the outside is maintained at a low state. When the absorbent body absorbs and retains a large amount of excreted fluid, the sheet recess 58 is pushed out due to the swelling of the absorbent body 4, the recessed state of the sheet recess 58 disappears, and the outer sheet 5 itself The thickness changes in a thinner way, so the visibility of the indicator bar increases step by step and significantly with the passage of time. In this way, the visibility of the indicator bar is further improved as the absorption and retention amount of the excreted fluid in the absorber 4 increases, so that the appropriate replacement time of the diaper can be more easily and accurately grasped from the outside.

Next, the common items in each of the above-mentioned embodiments will be explained. From the viewpoint that the proper replacement time of the diaper can be grasped more accurately, as shown in Figs. 7(a) to (c), it is preferable to apply from the side of the diaper to the non-skin facing side of the leak-proof sheet 3. Externally visible pattern P1. In a plan view, the pattern P1 may partially or entirely overlap with the indicator bar 1D, or may not overlap with the indicator bar 1D. In addition, in the embodiment shown in the figure, in addition to the pattern P1, a second pattern P2 that is a similar shape to the pattern P1 is applied, and the second pattern P2 is a state that can be seen from the outside of the diaper.

In particular, from the viewpoint that in addition to improving the visibility of the indicator bar, the visibility of the pattern is also improved, and the arrival of the appropriate replacement time of the diaper can be easily grasped from the outside, it is better to look down on the sheet, At least one pattern is formed so as to overlap in the thickness direction with a portion where the convex strip portion 51 and the concave strip portion 52 are formed in the exterior sheet 5, and the high basis weight area is formed in the exterior sheet 5 53 and the low basis weight region 54, the portion where the opening 55 is formed and the portion where the opening 55 is not formed in the exterior sheet 5, or the portion where the sheet recess 58 is formed. With this configuration, immediately after wearing the diaper, when viewed from the outer surface of the diaper, the area where the ridges 51, the high basis weight area 53, the openings 55 are not formed, or the area where the sheet recesses 58 are formed, and Compared with other parts, it is difficult to see the indicator bar 1D and the pattern P1. As the diaper wear time elapses, the overall thickness difference of the outer cover sheet 5 is reduced, so that the thickness of the outer cover sheet 5 is gradually reduced, so that the indicator bar 1D can be more clearly recognized while the pattern is recognized. As a result, it is possible to more easily grasp the arrival of the appropriate replacement time of the diaper from the outside.

Figures 7 (a) to (c) schematically show changes with time in the visibility of the indicator strip 1D and the patterns P1 and P2 in the outer packaging sheet 5 where the convex strip portion 51 and the concave strip portion 52 are formed . Fig. 7(a) shows the indicator strip 1D and the patterns P1 and P2 immediately after the diaper is worn, that is, in the dry and unloaded state of the exterior sheet 5. As shown in the figure, both the convex strip portion 51 and the concave strip portion 52 are arranged so as to overlap with at least one pattern P1 in the thickness direction. Since the average thickness of the portion where the protruding strip portion 51 is formed is thicker, the indicator bar 1D and the patterns P1 and P2 are not clear compared to the portion where the recessed strip portion 52 is formed, and are in a state of higher concealment. In addition, at the location where the concave strip portion 52 with a relatively thin average thickness is formed, the indicator bar 1D and the patterns P1 and P2 can be observed more clearly than the location where the convex strip portion 51 is formed.

Fig. 7(b) and Fig. 7(c) show that after wearing the diaper 1 shown in Fig. 7(a), the degree of the wet and pressurized state of the exterior sheet 5 gradually changes step by step. As shown in FIG. 7(b), when the outer cover sheet 5 becomes wet and pressurized, the thickness of the outer cover sheet 5 itself gradually becomes thinner, and the convex strip portion 51 gradually becomes toward the skin facing side of the diaper Since it is squashed, the average thickness of the protruding strip portion 51 becomes smaller. As a result, the indicator strip 1D and the respective patterns P1 and P2 can be more clearly seen from the outside of the diaper than immediately after wearing the diaper. When the degree of the wet and pressurized state becomes significant, as shown in FIG. 7(c), the indicator bar 1D and the patterns P1 and P2 can be more clearly seen. With this, it is possible to more easily grasp the arrival of the appropriate replacement time of the diaper from the outside.

From the viewpoint of making the above-mentioned effect more remarkable, it is also preferable to apply a plurality of patterns to the non-skin facing surface side of the leak-proof sheet 3. Furthermore, "plurality" includes the following two situations: as described above, a situation in which a plurality of patterns of similar shapes with the same pattern but different sizes are applied; and a situation in which two or more different patterns are applied.

From the viewpoint of increasing the rate of change of the sheet thickness and further improving the visibility of the indicator bar in a wet and pressurized state, the basis weight of the exterior sheet 5 is preferably 12 g/based on the basis weight of the entire sheet. cm ² or more, more preferably 15 g/cm ² or more, preferably 45 g/cm ² or less, more preferably 30 g/cm ² or less.

As mentioned above, the present invention has been described based on its preferred embodiments, but the present invention is not limited to the above-mentioned embodiments. For example, in the present embodiment, an example of an unfolded disposable diaper has been described as an absorbent article, but it is not limited to this form, and can also be applied to shorts-type disposable diapers, shorts-type menstrual sanitary napkins, etc. Absorbent articles.

In addition, in the above-mentioned embodiment, the extending direction of the furrow in the case where the protruding stripe portion 51 and the recessed stripe portion 52 are formed in the shape of a furrow is described as a form along the longitudinal direction X of the diaper 1, but the extension The direction is not limited to this. That is, the extending direction of the ridge shape formed by the convex strip portion 51 and the concave strip portion 52 may be a direction crossing the longitudinal direction X of the diaper 1, or may also coincide with the direction along the width direction Y of the diaper 1. In addition, the shape of the ridge may be a straight line or a curved shape such as a wave. In either case, the effects of the present invention can be fully exhibited.

Regarding the above-mentioned embodiments of the present invention, the following absorbent articles are further disclosed. <1> An absorbent article, which has a liquid-permeable front sheet, a leak-proof sheet, and an absorbent body of an absorber located between the front sheet and the leak-proof sheet. The longitudinal direction corresponding to the front-rear direction and the width direction orthogonal to the longitudinal direction have a ventral region arranged on the wearer's ventral side during wearing, a dorsal region arranged on the wearer's dorsal side, and a ventral region located on the wearer's dorsal side In the sub-crotch area between the back side area, and on the skin-facing side of the leak-proof sheet, an indicator strip for notifying urination by color change is arranged on the non-skin-facing side of the leak-proof sheet An exterior sheet made of non-woven fabric is arranged on the surface side, and the exterior sheet covers the non-skin facing side of the area where the indicator strips are arranged in the absorbent body, and changes from a dry and unloaded state to a wet and loaded state The thickness change rate in the pressurized state of 0.5 N/cm ² is 20% or more and 75% or less.

<2> The absorbent article as described in the above <1>, wherein the outer cover sheet is selected from hot-air non-woven fabrics, hot-air non-woven fabrics subjected to hot-air recovery treatment, and non-woven fabrics containing hydrophilic synthetic fibers obtained by imparting hydrophilicity to synthetic fibers , And at least one of non-woven fabrics containing hydrophilic natural fibers. <3> The absorbent article as described in the above <1> or <2>, wherein the thickness change rate is 30% or more and 70% or less, preferably 40% or more and 65% or less. <4> The absorbent article as described in any one of the above <1> to <3>, wherein the thickness of the outer cover sheet in the dry and unloaded state is 0.3 mm or more and 2.5 mm or less, preferably 0.5 mm or more and 2 mm or less, more preferably 0.7 mm or more and 1.5 mm or less. <5> The absorbent article as described in any one of the above <1> to <4>, wherein the thickness of the outer cover sheet is 0.1 mm when it is in the above- ^{mentioned wet and pressurized state with a load of 0.5 N/cm 2} The above 2 mm or less, preferably 0.2 mm or more and 1.5 mm or less, more preferably 0.3 mm or more and 1 mm or less.

＜6＞ The absorbent article described in any one of the above <1> to <5>, wherein the area where the indicator bar is arranged is provided with at least 2 indicator bars including the first and second indicator bars extending in the length direction , The average thickness of the portion overlapping the first indicator bar in the thickness direction of the exterior sheet is different from the average thickness of the portion overlapping the second indicator bar in the thickness direction. ＜7＞ The absorbent article as described in the above <6>, wherein the outer covering sheet is formed with a plurality of ridges protruding from the skin-facing surface side toward the non-skin-facing surface side, and a plurality of ridges located between the ridges Recessed section, The first indicator bar overlaps the convex strip portion in the thickness direction, and the second indicator bar overlaps the concave strip portion in the thickness direction. ＜8＞ The absorbent article as described in any one of the above <1> to <5>, wherein the outer cover sheet has a high basis weight region with a relatively high basis weight in a plan view of the expanded state of the absorbent article, The area where the indicator bar is arranged is equipped with at least 2 indicator bars including the first and second indicator bars extending in the above-mentioned length direction, The ratio of the existence ratio of the high basis weight area existing in the position overlapping with the first indicator bar in the thickness direction and the high basis weight area existing at the position overlapping the second indicator bar in the thickness direction There are different ratios.

＜9＞ The absorbent article as described in any one of the above <1> to <5>, wherein the outer cover sheet has a plurality of openings penetrating in the thickness direction, The area where the indicator bar is arranged is equipped with at least 2 indicator bars including the first and second indicator bars extending in the above-mentioned length direction, The existence ratio of the openings existing at the position overlapping the first indicator bar in the thickness direction is different from the existence ratio of the openings existing at the position overlapping the second indicator bar in the thickness direction. ＜10＞ The absorbent article as described in any one of the above <1> to <9>, wherein the outer cover sheet has a non-skin facing surface at a position overlapping with the area where the indicator strip is arranged in the thickness direction The side faces the recessed part of the sheet that is recessed on the side facing the skin. ＜11＞ The absorbent article as described in the above <10>, wherein the absorbent body is formed with an absorbent body recessed portion recessed from the non-skin facing surface side toward the skin facing surface side, and The sheet depressed portion is formed by the absorbent body depressed portion.

<12> The absorbent article as described in the above <10> or <11>, wherein an elastic member extending in the longitudinal direction or the width direction is arranged in the sub-crotch region, and the sheet recess is formed by the elastic member unit. <13> The absorbent article as described in any one of the above <1> to <12>, in which a pattern is applied to the non-skin facing surface side of the leak-proof sheet. <14> The absorbent article as described in the above <13>, in which a plurality of patterns are applied to the non-skin facing surface side of the leak-proof sheet. <15> The absorbent article as described in any one of the above <1> to <14>, wherein the basis weight of the outer cover sheet is 12 g/cm ² or more and 45 g/ in terms of the basis weight of the entire sheet cm ² or less, preferably 15 g/cm ² or more and 30 g/cm ² or less. Example

Hereinafter, the present invention will be described in more detail with examples. However, the scope of the present invention is not limited to this embodiment. In the following description, the pressurized state with a load of 0.5 N/cm ² is also referred to as "pressurized state".

[Example 1] A single-layer hot-air nonwoven fabric (basis weight: 20 g/cm ² ) containing synthetic fibers having a core-sheath structure was used as the outer covering sheet 5 to produce the unfolded disposable diaper shown in Fig. 1, as described above The core-sheath structure is that the core component is polyethylene terephthalate (PET), and the sheath component is polyethylene (PE). The outer covering sheet 5 of the present embodiment is formed with a ridge-shaped convex strip portion 51 and a groove-shaped concave strip portion 52. The convex strip portion 51 and the concave strip portion 52 are formed to extend in the length direction of the diaper 1.

[Example 2] A single-layer hot-air nonwoven fabric (basis weight: 20 g/cm ² ) containing synthetic fibers having a core-sheath structure and subjected to hot-air recovery treatment was used as the exterior sheet 5 to produce the unfolding shown in Fig. 1 Type disposable diaper, the core component of the core sheath structure is polyethylene terephthalate (PET), and the sheath component is polyethylene (PE).

[Example 3] A single-layer hot-air nonwoven fabric (basis weight: 20 g/cm ² ) containing hydrophilic synthetic fibers obtained by hydrophilizing synthetic fibers with a core-sheath structure was used as the exterior sheet 5 to produce In the expanded disposable diaper shown in Figure 1, the core component of the core sheath structure is polyethylene terephthalate (PET), and the sheath component is polyethylene (PE).

^{[Example 4] A single-layer hot-air non-woven fabric (basis weight: 20 g/cm 2} ) containing a mixed fiber obtained by mixing synthetic fibers with a core-sheath structure and cotton at a mass ratio of 15:1 was used as the exterior sheet 5, To manufacture the expanded disposable diaper shown in FIG. 1, the core component of the core sheath structure is polyethylene terephthalate (PET), and the sheath component is polyethylene (PE).

[Example 5] A spunbonded nonwoven fabric (basis weight: 18 g/cm ² ) containing synthetic fibers made of polypropylene (PP) as a raw material was perforated to form a nonwoven fabric with a plurality of openings 55 as the exterior Sheet 5 is used to manufacture the unfolded disposable diaper shown in Fig. 1. The exterior sheet 5 of the present embodiment is formed in a macro pattern in which each opening 55 exists at the apex of an imaginary hexagon when viewed from above.

[Comparative Example 1] A single-layer spunbonded non-woven fabric (basis weight: 15 g/cm ² ) containing synthetic fibers made from polypropylene (PP) resin was used as the exterior sheet 5 to produce the unfolding shown in Fig. 1 Type disposable diapers.

[Comparative Example 2] A single-layer air-woven nonwoven fabric (basis weight: 40 g/cm ² ) containing synthetic fibers made from polyethylene terephthalate (PET) resin was used as the exterior sheet 5 to produce The expanded disposable diaper shown in Figure 1.

〔Measurement of sheet thickness〕 For the exterior sheet 5 used in the Examples and Comparative Examples, the sheet thickness a in a dry and unloaded state and the sheet thickness b in a wet and pressurized state were measured, respectively. The method for measuring the thickness of the sheet is measured based on the above-mentioned method. Based on the obtained thickness a and thickness b, the percentage of thickness b relative to thickness a is defined as the thickness change rate (%). The results are shown in Table 1.

[Visibility of the indicator bar] For the diapers of the Examples and Comparative Examples, the diapers in the dry and unloaded state and the diapers in the wet and pressurized state were compared, and the visibility of the indicator bar was evaluated according to the following criteria. A diaper with lower visibility of the indicator bar in a dry and unloaded state and higher visibility of the indicator bar in a wet and pressurized state is better for judging an appropriate replacement time. The results are shown in Table 1. A: The position of the indicator bar and its discoloration can be clearly seen. B: It is slightly difficult to see the placement position of the indicator bar and its discoloration. C: It is difficult to visually recognize the position of the indicator bar and its discoloration.

[Table 1] Example 1 Example 2 Example 3 Example 4 Example 5 Comparative example 1 Comparative example 2 Exterior sheet Non-woven fabric and its shape Hot-air non-woven fabric (ditch shaping) Hot-air non-woven fabric (hot-air recovery treatment) Hot air non-woven fabric (hydrophilization treatment) Cotton mixed hot air non-woven fabric Spunbond non-woven fabric (with holes) Spunbond non-woven fabric Air-spun non-woven fabric Sheet thickness under dry and unloaded state a(mm) 0.53 1.06 0.84 0.71 1.15 0.23 1.60 Sheet thickness under wet and pressurized state b(mm) 0.35 0.55 0.36 0.45 0.86 0.23 1.46 Thickness change rate (%) 66 52 43 63 75 100 92 Assessment Visibility of indicator bar (dry and unloaded state) B C C C B A C Visibility of indicator bar (wet and pressurized state) A A A A A A C

As shown in Table 1, it can be seen that, compared with the diaper of the comparative example, the diaper of the example using the outer cover sheet 5 with a specific thickness change rate has lower visibility in a dry and unloaded state, and is more damp than the diaper of the comparative example. High visibility under pressure. In particular, it can be seen that the use of Example 2 of the outer covering sheet 5 with a large thickness in a dry and unloaded state, or the Examples 3 and 4 of the outer covering sheet 5 containing hydrophilic fibers, should be dry and unloaded. When the load state changes to a wet and pressurized state, the visibility of the indicator bar is significantly improved. Therefore, it can be understood that the absorbent article of the present invention can easily and accurately grasp the appropriate replacement time from the outside. [Industrial availability]

According to the present invention, there is provided an absorbent article which can easily and accurately grasp the appropriate replacement time from the outside.

1: diapers 1A: Absorbent body 1D: Indicator strip 2: Front sheet 3: Leak-proof sheet 4: Absorber 4A: Depressed part of absorber 5: Exterior sheet 5a: Adhesive 6: Leak-proof flanging 7: Velcro 41: Absorbent core 42: package chip material 51: Protruding section 52: recessed section 53: High basis weight area 54: Low basis weight area 55: Hole 58: Sheet depression 61: Sheet for forming leak-proof flanging 62: (for leak-proof flanging formation) elastic member 71: fixed part 72: With a buckle 85: leg elastic member F: Ventral area M: sub-crotch area P1: Pattern P2: Pattern R: dorsal area

Fig. 1 is an embodiment of the absorbent article of the present invention, and schematically shows an unfolded plan view of the skin facing side (inner surface side) in an unfolded and stretched state. Fig. 2 is an enlarged cross-sectional view of the absorbent article shown in Fig. 1 taken along the line I-I. Fig. 3 is an enlarged cross-sectional view of another embodiment of the absorbent article of the present invention along the width direction of the absorbent article. Fig. 4 is an enlarged cross-sectional view of another embodiment of the absorbent article of the present invention along the width direction of the absorbent article. Fig. 5 is an enlarged cross-sectional view of another embodiment of the absorbent article of the present invention along the width direction of the absorbent article. Fig. 6 is an enlarged cross-sectional view of another embodiment of the absorbent article of the present invention along the width direction of the absorbent article. Figures 7(a) to (c) are schematic diagrams showing changes in the visibility of the pattern on the non-skin facing surface of the absorbent article regarding one embodiment of the absorbent article of the present invention.

1: diapers

1A: Absorbent body

1D: Indicator strip

2: Front sheet

3: Leak-proof sheet

4: Absorber

5: Exterior sheet

5a: Adhesive

6: Leak-proof flanging

41: Absorbent core

42: package chip material

51: Protruding section

52: recessed section

61: Sheet for forming leak-proof flanging

62: (for leak-proof flanging formation) elastic member

Claims (15)

An absorbent article comprising a liquid-permeable front sheet, a leak-proof sheet, and an absorbent body of an absorber located between the front sheet and the leak-proof sheet, and has an absorbent body corresponding to the front and back directions of the wearer The length direction and the width direction orthogonal to the length direction, and have the ventral region arranged on the ventral side of the wearer during wearing, the dorsal region arranged on the back of the wearer, and the ventral region and the back In the sub-crotch area between the side areas, an indicator strip that informs urination by color change is arranged on the skin-facing side of the above-mentioned leak-proof sheet, and is arranged on the non-skin-facing side of the above-mentioned leak-proof sheet There is an exterior sheet composed of a non-woven fabric, and the exterior sheet covers the non-skin facing side of the area where the indicator strips are arranged in the absorbent body, and changes from a dry and unloaded state to a moist and a load of 0.5 N/ The thickness change rate in the pressurized state of cm ^{2 is between 20% and 75%.} The absorbent article of claim 1, wherein the outer cover sheet is selected from the group consisting of hot-air non-woven fabrics, hot-air non-woven fabrics subjected to hot-air recovery treatment, non-woven fabrics containing hydrophilic synthetic fibers obtained by imparting hydrophilicity to synthetic fibers, and containing hydrophilic natural fibers At least one of the non-woven fabrics. Such as the absorbent article of claim 1, wherein the above-mentioned thickness change rate is 30% or more and 70% or less. The absorbent article of claim 1, wherein the thickness of the outer cover sheet in the dry and unloaded state is 0.3 mm or more and 2.5 mm or less. The absorbent article of claim 1, wherein the thickness of the outer cover sheet when it is in the above- ^{mentioned wet and pressurized state with a load of 0.5 N/cm 2 is 0.1 mm or more and 2 mm or less.} For example, the absorbent article of claim 1, in which the area where the indicator bar is arranged is provided with at least 2 indicator bars including the first and second indicator bars extending in the length direction, The average thickness of the portion overlapping the first indicator bar in the thickness direction of the exterior sheet is different from the average thickness of the portion overlapping the second indicator bar in the thickness direction. The absorbent article according to claim 6, wherein the outer covering sheet is formed with a plurality of convex strips protruding from the skin facing surface side toward the non-skin facing surface side, and concave strips located between the convex strips , The first indicator bar overlaps the convex strip portion in the thickness direction, and the second indicator bar overlaps the concave strip portion in the thickness direction. The absorbent article of claim 1, wherein the outer cover sheet has a high basis weight area with a relatively high basis weight in a plan view of the expanded state of the absorbent article, The area where the indicator bar is arranged is equipped with at least 2 indicator bars including the first and second indicator bars extending in the above-mentioned length direction, The ratio of the existence ratio of the high basis weight area existing in the position overlapping with the first indicator bar in the thickness direction and the high basis weight area existing at the position overlapping the second indicator bar in the thickness direction There are different ratios. The absorbent article of claim 1, wherein the outer covering sheet has a plurality of openings penetrating in the thickness direction, The area where the indicator bar is arranged is equipped with at least 2 indicator bars including the first and second indicator bars extending in the above-mentioned length direction, The existence ratio of the openings existing at the position overlapping the first indicator bar in the thickness direction is different from the existence ratio of the openings existing at the position overlapping the second indicator bar in the thickness direction. The absorbent article of claim 1, wherein the outer cover sheet has a sheet recessed from the non-skin facing side toward the skin facing side at a position where the outer covering sheet overlaps the area where the indicator strip is arranged in the thickness direction Depression. The absorbent article according to claim 10, wherein the absorbent body is formed with an absorbent body recessed portion recessed from the non-skin facing surface side toward the skin facing surface side, The sheet depressed portion is formed by the absorbent body depressed portion. The absorbent article of claim 10, wherein an elastic member extending in the length direction or the width direction is arranged in the sub-crotch area, The sheet depressed portion is formed by the elastic member. The absorbent article according to claim 1, wherein a pattern is applied to the non-skin facing surface side of the leak-proof sheet. The absorbent article according to claim 13, wherein a plurality of patterns are applied to the non-skin facing surface side of the leak-proof sheet. The absorbent article of claim 1, wherein the basis weight of the outer cover sheet is 12 g/cm ² or more and 45 g/cm ² or less based on the basis weight of the entire sheet.

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