CN108601694B - Absorbent article - Google Patents

Abstract

The invention provides an absorbent article having a compressed line formed on an absorbent body, which can effectively spread body fluid to a non-compressed region and absorb body fluid in a wide range even if the compressed line is not densely formed. The absorptive article of the present invention comprises a liquid-permeable top sheet (10), a back sheet (20), and at least two absorptive bodies (30, 40) stacked between the top sheet (10) and the back sheet (20), wherein each of the two absorptive bodies (30, 40) has a plurality of compressed lines (31, 41) recessed in the thickness direction thereof, and the compressed lines (31, 41) of the two absorptive bodies at least partially intersect each other when viewed in the plane direction.

Description

Absorbent article

Technical Field

The present invention relates to an absorbent article to be worn in the crotch of a wearer and to absorb and retain liquid such as urine.

Background

Conventionally, an absorbent article is known which is worn in the crotch of a wearer for the purpose of absorbing and retaining excreted body fluid. Absorbent articles are, for example, disposable diapers, diapers and sanitary napkins. Further, as the disposable diaper, for example, a pants-type diaper in which a front body and both right and left side portions of a rear body are joined, or a tape-type diaper worn by attaching a fastening tape attached to the rear body to the front body is known.

In addition, absorbent articles are configured to absorb a large amount of body fluid so as to be able to cope with long-term wearing or excretion of adults. For example, in the case of such absorbent articles, diapers having a high absorption capacity for use in nursing care are known. Diapers having a high absorption capacity are generally used as disposable diapers of the insert tape type or the pant type, and are appropriately exchanged after excretion. In order to absorb a large amount of body fluid, the diaper is generally provided with an absorbent body made of a large amount of absorbent material, and is also large in size so as to cover a large area of the wearer's body.

However, even if the diaper having a high absorption capacity is wet as described above, body fluid may leak out and stain a tape-type or pants-type disposable diaper disposed thereunder when the diaper is worn for a long time. That is, if the wearer wears the garment for a long time, the body fluid is repeatedly and continuously absorbed at one position (particularly, the crotch portion) of the absorbent body. Therefore, if the diffusibility of the absorbent body is poor, the absorption load becomes partially large, and if the absorption amount is saturated, the bodily fluid that has not been absorbed flows out from the diaper. On the other hand, in order to increase the absorption amount of the absorber in the crotch portion, it is considered to increase the absorption amount of body fluid partially by increasing the absorbent material in the crotch portion, but the thickness of the absorber is locally increased, so that the wearing feeling is deteriorated, and there is a concern that the comfort is lowered.

In order to improve the diffusibility of such a large-sized absorbent body having a high absorption amount, an absorbent article is known in which a part of the absorbent body is compressed in the thickness direction to form a compressed line (patent documents 1 and 2). The absorbent body (absorbent core) disclosed in patent document 1 is obtained by subjecting a part of the absorbent body, which requires a large amount of absorption or diffusion of body fluid such as the crotch, to a dense embossing process and subjecting other parts to a sparse embossing, and the embossing is formed into a continuous pattern throughout the whole body. Further, the absorbent body disclosed in patent document 2 is configured such that the extrusion grooves are formed in a lattice shape on the front surface side, and the extension direction of the extrusion grooves is different from the product longitudinal direction and the product width direction. By forming the compressed line in the absorbent body in this manner, even when a large amount of body fluid is locally excreted, the body fluid is diffused along the compressed line, so that the body fluid can be absorbed over a wide range of the absorbent body, and as a result, the diffusibility of the absorbent body can be improved.

In addition, in order to improve the diffusibility of a large absorbent body with a high absorption amount, an absorbent article is known in which slits are formed to penetrate the absorbent body in the thickness direction (patent documents 3 and 4). For example, patent document 3 discloses a technique for forming Y-shaped slits in a single-layer absorber. Patent document 4 discloses a technique in which a plurality of absorbers are stacked in the thickness direction, and slits are formed in each absorber. Such slits are: the absorbent body is formed on the absorbent body for various purposes such as improving liquid diffusibility, improving fitness to the body of the wearer, preventing solid matters such as feces from contacting the skin of the wearer for a long time, and facilitating the bending of the absorbent body.

Documents of the prior art

Patent document

Japanese patent application laid-open No. 2004-16373 of patent document 1

Japanese patent laid-open No. 2015-16218 of patent document 2

Japanese patent laid-open No. 2012 and 090818 of patent document 3

Japanese patent application laid-open No. 2014-014726 in patent document 4

Disclosure of Invention

Problems to be solved by the invention

[ first subject ]

In the absorbent bodies having compressed lines as disclosed in patent documents 1 and 2, the difference between the diffusibility of the portions having compressed lines and the diffusibility of the regions (non-compressed regions) having no compressed lines is large. Because of this difference in diffusibility, there is a problem that the body fluid spreads widely along the compressed line but is not absorbed smoothly by the non-compressed region, and the body fluid reaches the end of the absorbent body along the compressed line and leaks from the end.

More specifically, in an absorbent body having a compressed line formed therein, when a body fluid is absorbed by the absorbent body, the body fluid is spread along the compressed line in time by capillary action and then spread in a non-compressed region. In this way, the time for diffusion of the body fluid is different between the portion where the compressed line is formed and the non-compressed region. When the basis weight of the absorbent material constituting the absorbent body is low, the above-mentioned time difference in diffusion time is not a serious problem, but when the basis weight of the absorbent material is increased in order to increase the absorption amount of body fluid, the absorption time in the non-compressed region becomes slower. Therefore, in the absorbent body having a high absorption amount, the time difference between the diffusion times of the body fluid is further increased in the portion where the compressed line is formed and the non-compressed region, and in some cases, there is a possibility that only the compressed line is wetted with the body fluid and the body fluid is hardly absorbed in the non-compressed region. Further, since the absorbent material is compressed at the portion where the crush line is formed, the amount of absorption of the body fluid is small compared to the non-crush region. Therefore, a large amount of body fluid may leak to the outside by reaching the end of the absorbent body along the compressed line.

In order to solve the above problem, a measure is also taken to narrow intervals between the compressed lines formed in the absorbent body and to facilitate the penetration of body fluid into the non-compressed regions. However, since the absorbent body has a high rigidity between the compressed lines and the periphery thereof, narrowing the interval between the compressed lines to increase the density thereof hardens the skin feel of the entire absorbent body, which is a problem of impairing the wearing feel of the absorbent article.

In view of the above, a first object of the present invention is to provide an absorbent article in which compressed lines are formed on an absorbent body in order to improve diffusion properties while improving the absorption amount of body fluid, and which can efficiently diffuse body fluid to a non-compressed region and absorb body fluid over a wide range without densely forming compressed lines.

[ second subject ]

As disclosed in patent documents 3 and 4, in the case where the slits are formed in the absorber to improve liquid diffusibility, the liquid can flow through the slits, and therefore the diffusibility of the portions where the slits are formed can be improved. In short, the slit can diffuse the body fluid horizontally when the wearer is lying, but cannot diffuse the body fluid vertically upward or suck it upward when the wearer is standing. Therefore, although the formation of slits can increase the diffusion rate of body fluid, it is difficult to diffuse and permeate body fluid throughout the absorbent body, particularly when the wearer takes a standing posture.

Further, although it is also thought to increase the number of slits formed in the absorbent body to improve the diffusibility, when the slits are formed in the entire absorbent body, unevenness is formed on the surface of the absorbent body, which causes a problem that the comfort is impaired.

In view of the above, a second object of the present invention is to improve the diffusion of body fluid upward in the vertical direction in an absorbent article having an absorbent body with slits formed therein, so that the entire absorbent body can absorb body fluid even when the wearer takes a standing posture.

Means for solving the problems

[ solution of the first problem ]

As a result of extensive examination of the solution of the first problem, the inventors of the present invention have formed squeeze lines on the absorbers while increasing the absorption amount of body fluid by laminating two or more layers of absorbers, and crossed the squeeze lines formed on the absorbers. Thereby, the following findings were obtained: even if the compressed lines are not densely formed on the absorbers, the body fluid can be effectively spread to the non-compressed region, and the body fluid can be absorbed over a wide range. The present inventors have then conceived based on this finding that the above problems can be solved, and have completed the present invention. Specifically, the present invention has the following configuration.

The present invention relates to an absorbent article such as a disposable diaper, a sanitary napkin, and the like. The absorbent article includes a liquid-permeable top sheet 10, a back sheet 20, and at least two absorbers 30, 40 stacked between the top sheet and the back sheet. Further, the backsheet 20 is preferably a liquid-impermeable sheet-like member, but a liquid-permeable sheet-like member may be used. The two absorbers 30, 40 have a plurality of compressed lines 31, 41, respectively, that are recessed in the thickness direction of the absorbers. The compressed lines 31, 41 of the two absorbent bodies at least partially intersect each other when viewed in the planar direction. The compressed lines 31, 41 may be recessed on the top sheet side (skin-facing surface side) of the absorbent body, recessed on the back sheet side (skin-non-facing surface side), or recessed on both sides of the top sheet and back sheet. The term "viewed in a plane direction" means a direction facing the topsheet 10 or the backsheet 20.

With the above-described structure, the two absorbers 30, 40 are stacked in the thickness direction, whereby the absorption amount of the entire absorbent article can be increased. Further, by forming the compressed lines 31 and 41 in the respective absorbers 30 and 40, the diffusion of body fluid can be improved. Further, by arranging the absorbent bodies 30 and 40 such that the compressed lines 31 and 41 intersect each other, body fluid can be efficiently permeated also in a region where the compressed lines are not formed (non-compressed region). That is, the body fluid spread along the compressed line of the absorbent body on one side is easily absorbed by the non-compressed region of the absorbent body on the other side. Therefore, the body fluid spreading along the compressed line of the absorbent body on one side is less likely to reach the end portion, and the leakage to the outside can be effectively prevented. Further, since the body fluid can be absorbed over a wide range in the two-layered absorber 30, 40, the absorption amount of the body fluid is increased, and the wearer is not annoyed even if worn for a long time. Further, by forming the compressed lines 31, 41 in each of the absorbent bodies 30, 40 of the two layers, it is not necessary to form the compressed lines densely in each of the absorbent bodies. Therefore, the skin feeling of each absorber can be prevented from becoming hard.

In the absorbent article of the present invention, the two absorbers 30, 40 may have a plurality of non-compressed regions 32, 42 surrounded by compressed lines 31, 41, respectively. In this case, at least a part of the compressed line of the absorbent body on the one side preferably overlaps with the non-compressed region of the absorbent body on the other side.

With the above configuration, since the non-compressed regions 32 and 42 are surrounded by the compressed lines 31 and 41, the body fluid can be easily introduced into the non-compressed regions 32 and 42. In addition, since a part of the compressed line of at least one side of the absorbent body overlaps with the non-compressed region of the other side of the absorbent body, the body fluid diffused through the compressed line can be easily introduced into the non-compressed region.

In the absorbent article of the present invention, the two absorbers 30, 40 may have intersection portions 33, 43 where the plurality of compressed lines 31, 41 intersect, respectively. In this case, it is preferable that at least a part of the intersection portion of the absorbent body on one side overlaps with the non-compressed region of the absorbent body on the other side.

With the above-described structure, the compressed threads 31 and 41 intersect at the intersection portions 33 and 43 formed on the respective absorbers 30 and 40, and therefore, the body fluid is likely to accumulate. By overlapping the intersection of the absorbent body on this side with the non-compressed region of the other absorbent body, the body fluid retained at the intersection can be efficiently permeated into the non-compressed region.

In the absorbent article of the present invention, when each of the absorbers 30, 40 has a plurality of intersection portions 33, 43, the intersection portion of one absorber and the intersection portion of the other absorber preferably overlap at least partially. That is, at least a part of the plurality of intersection portions formed on the absorbent body on the one side may overlap at least a part of the plurality of intersection portions formed on the absorbent body on the other side.

In the above-described structure, the intersection points of the respective absorbent bodies overlap each other, and the body fluid can be efficiently circulated from one absorbent body to the other absorbent body through the overlapped intersection points. That is, the body fluid that has spread along the compressed line of the absorbent body on one side stays at the intersection, but at this time passes through the intersection of the absorbent bodies on the other side and moves to the compressed line of the absorbent bodies on the other side. In this way, the liquid diffusing function of the compressed lines of both the absorbent bodies can be effectively exhibited by overlapping the intersection portions of the absorbent bodies.

In the present invention, the two absorbers are the first absorber 30 on the topsheet 10 side and the second absorber 40 on the backsheet 20 side. In this case, the second absorber 40 is preferably formed with compressed lines 41 recessed on the surface on the first absorber 30 side, and a gap is formed between the first absorber 30 and the portion where the compressed lines 41 are formed.

As described above, by forming the gap between the first absorber 30 and the second absorber 40, the body fluid absorbed by the first absorber 30 from the top sheet 10 side flows into the gap and is effectively diffused to the second absorber 40.

In the absorbent article of the present invention, the first absorbent 30 preferably has a compressed line 31 recessed on the surface on the second absorbent side, and a gap is formed between the second absorbent 40 and the portion where the compressed line 31 is formed.

With the above configuration, by forming the compressed lines 31 that recess the surface of the back surface of the first absorbent 30, the body fluid that has permeated the first absorbent 30 easily flows down to the second absorbent 40.

The absorbent article of the present invention may further include a third absorber 70 between the top sheet 10 and the first absorber 30 or between the back sheet 20 and the second absorber 40. In this case, the third absorber 70 preferably has a plurality of compressed lines 71 that are recessed in the thickness direction of the first absorber 30 and the second absorber 40, as well.

With the above-described structure, the third absorber 70 is further provided, whereby the absorption amount of the entire absorbent main body can be increased. Further, by forming the compressed line 71 also in the third absorbent body 70, the liquid diffusibility can be maintained.

In the absorbent article of the present invention, the compressed line of the absorber on one side may extend in the longitudinal direction of the absorbent article, and the compressed line of the absorber on the other side may extend in the width direction of the absorbent article.

In the above-described structure, the body fluid can be diffused in the longitudinal direction and also in the width direction by intersecting the compressed line of the absorbent body extending in one longitudinal direction with the compressed line of the absorbent body extending in the other width direction. In particular, the body fluid is difficult to diffuse in the longitudinal direction, and the body fluid is likely to leak from the end in the width direction. Therefore, it is preferable that the absorbent body disposed in the upper layer is formed with compressed lines extending in the longitudinal direction, and the absorbent body disposed in the lower layer is formed with compressed lines extending in the width direction. This makes it possible to diffuse the body fluid that first contacts the upper absorbent layer in the longitudinal direction and thereafter to diffuse the body fluid that has permeated the lower absorbent layer in the width direction in an assisted manner. As a result, the body fluid can be effectively diffused in the longitudinal direction, and leakage from the end in the width direction can be prevented.

In the absorbent article of the present invention, the absorbent body on one side may have a plurality of non-compressed regions surrounded by compressed lines, and the compressed lines of the absorbent body on the other side may extend in the longitudinal direction of the absorbent article or in the width direction of the absorbent article.

In the above-described structure, the compressed lines formed in the absorbent body on one side may be formed in a lattice pattern, for example, as non-compressed regions surrounded by the compressed lines, and the compressed lines formed in the absorbent body on the other side may be formed to extend in the longitudinal direction or the width direction. With this configuration, the compressed lines 31, 41 of the two absorbers at least partially cross each other when viewed in a planar direction, so that the body fluid can be effectively spread to the non-compressed region and absorbed over a wide range.

In the absorbent article having the compressed lines formed on the absorbent body in order to improve the diffusion property while improving the absorption amount of the body fluid, the body fluid can be efficiently diffused to the non-compressed region and absorbed over a wide range without densely forming the compressed lines. As a result, the wearing sensation of the absorbent article is not impaired, and leakage of body fluid from the end portions of the absorbent body can be prevented.

[ solution to the second problem ]

As a result of extensive examination of the solution of the second problem, the inventors of the present invention have formed slits in the uppermost absorber and formed one or more compressed lines in the absorber located below the uppermost absorber in an absorbent article in which a plurality of absorbers are stacked. Thereby, the following findings were obtained: the body fluid diffuses through the slits of the absorbent body in the upper layer, and flows down to the absorbent body in the lower layer, and further diffuses along the compressed lines formed in the absorbent body in the lower layer, so that the body fluid can be absorbed throughout the entire absorbent body. Furthermore, the compressed thread formed on the absorbent body of the lower layer has the ability to absorb the body fluid upward in the vertical direction by capillary action. Therefore, by forming the compressed line in the absorbent body of the lower layer, particularly preferably by forming the compressed line so as to overlap the slit of the absorbent body of the upper layer, the body fluid flowing down from the slit can be diffused vertically upward through the compressed line. Then, the present inventors have found that the problems of the prior art can be solved based on the above findings, and have completed the present invention. Specifically, the present invention has the following configuration.

The present invention relates to an absorbent article such as a disposable diaper, a sanitary napkin, and the like. The absorbent article includes a liquid-permeable top sheet 10, a back sheet 20, and at least two absorbers 30, 40 stacked between the top sheet and the back sheet. Further, the backsheet 20 is preferably a liquid-impermeable sheet-like member, but a liquid-permeable sheet-like member may be used. Here, the at least two absorbers include an upper absorber 30 on the topsheet 10 side and a lower absorber 40 on the backsheet 20 side. The upper layer absorbent body 30 has one or more slits 36 extending through the absorbent body in the thickness direction. The lower layer absorber 40 has a plurality of compressed lines 41 that are recessed in the thickness direction of the absorber. Further, the "slits" formed in the upper absorber 30 include a hole-like slit having both closed ends, a slit having a shape in which one end is closed and the other end is open, and a slit having a shape in which both ends are open and the absorber is divided.

With the above-described structure, by forming the slit 36 in the upper layer absorber 30, body fluid such as urine is diffused in the upper layer absorber 30 through the slit 36 and flows down to the lower layer absorber 40 through the slit 36. Further, since the compressed line 41 is formed in the lower layer absorber 40, the body fluid flowing down through the slit 36 is diffused in the lower layer absorber 40 along the compressed line 41. In particular, since the compressed lines 41 formed in the lower absorbent body 40 have the ability to suck up the body fluid in the vertical direction, the body fluid spreads widely along the compressed lines 41 into the lower absorbent body 40 even when the wearer assumes a standing position. Further, the body fluid diffused in the lower layer absorbent body 40 along the compressed line 41 also permeates into the upper layer absorbent body 30. This allows the entire upper and lower absorbent bodies 30, 40 to absorb bodily fluids.

In the absorbent article of the present invention, the slits 36 of the upper layer absorbent 30 preferably overlap at least a portion of the compressed line 41 of the lower layer absorbent 40.

With the above-described structure, by positioning the compressed line 41 of the lower absorbent body 40 below the slit 36 of the upper absorbent body 30, the body fluid flowing down through the slit 36 can be directly introduced into the compressed line 41 and can be diffused along the compressed line 41. Since the slit 36 communicates with the compressed line 41, the whole absorbent body can absorb body fluid, the absorption rate and the absorption amount are increased, and leakage of body fluid can be prevented.

In the absorbent article of the present invention, the slits 36 of the upper layer absorber 30 preferably extend in the longitudinal direction of the absorbent article. In this case, the slit 36 preferably overlaps with a compressed line extending in the widthwise direction of the absorbent article or a compressed line extending in a direction inclined with respect to the longitudinal direction among the compressed lines 41 of the lower absorbent body 40.

With the above-described structure, by overlapping the slit 36 extending in the longitudinal direction and the compressed line 41 extending in the width direction, the bodily fluid can be diffused in the longitudinal direction and also in the width direction. In particular, the body fluid is difficult to diffuse in the longitudinal direction, and the body fluid is likely to leak from the end in the width direction. Therefore, it is preferable that the slits 36 extending in the longitudinal direction be formed in the upper layer absorber 30, and the compressed lines 41 extending in the width direction be formed in the lower layer absorber 40. This makes it possible to diffuse the body fluid that first contacts the upper layer absorbent body 30 in the longitudinal direction and thereafter to diffuse the body fluid that has permeated the lower layer absorbent body 40 in the width direction in an assisted manner. As a result, the body fluid can be effectively diffused in the longitudinal direction, and leakage from the end in the width direction can be prevented. Further, by positioning the compressed line 41 extending in the width direction of the lower layer absorbent body 40 below the slit 36 of the upper layer absorbent body 30, the slit 36 is less likely to be narrowed even when pressure is applied from the width direction, as in the case where the upper layer absorbent body 30 is sandwiched between the wearer's feet. That is, by forming the compressed line 41 extending in the width direction in the lower layer absorber 40, the rigidity of the lower layer absorber 40 against the pressure in the width direction is improved. As a result, the rigidity of the upper layer absorbent body 30 overlapped and joined with the lower layer absorbent body 40 is also increased, and therefore the slits 36 formed in the upper layer absorbent body 30 are less likely to collapse.

In the absorbent article of the present invention, the upper layer absorbent body 30 preferably has a plurality of compressed lines 31 in the absorbent body concave in the thickness direction.

With the above configuration, by forming the compressed lines 31 in addition to the slits 36 in the upper layer absorbent body 30, the diffusion of body fluid on the surface of the upper layer absorbent body 30 can be further improved. Further, the range in which the body fluid penetrates the upper layer absorbent body 30 along the compressed line 31 is expanded, and the body fluid that has subsequently penetrated the upper layer absorbent body 30 also moves to the lower layer absorbent body 40, so the body fluid can be widely absorbed by the upper and lower absorbent bodies 30, 40.

In the absorbent article of the present invention, the plurality of compressed lines 31 formed in the upper layer absorbent body 30 preferably include a connection to the slit 36. That is, the compressed line 31 formed in the upper layer absorbent body 30 preferably reaches the slit 36 at least at one end thereof, and the outer peripheral edge of the slit 36 is compressed, and the compressed line 31 and the slit 36 are preferably in communication with each other.

With the above-described structure, the slits 36 communicate with the compressed lines 31 in the upper layer absorbent body 30, and the body fluid temporarily stored in the slits 36 easily diffuses along the compressed lines 31. On the contrary, since the body fluid diffused along the compressed line 31 may flow into the slit 36, the body fluid is easily introduced into the lower layer absorber 40 through the slit 36. Further, if the slit 36 is connected to a part of the compressed line 31, the body fluid temporarily stored in the slit 36 is easily diffused along the compressed line 31. In particular, since the bodily fluid can be diffused along the compressed line 31 from the wall surface inside the slit 36, the diffusion of the bodily fluid into the upper layer absorbent body 30 can be improved.

In the absorbent article of the present invention, the lower absorbent body 40 preferably has a non-compressed region 42 surrounded by the compressed lines 41. In this case, the slits 36 of the upper layer absorbent body 30 preferably overlap at least a portion of the non-compressed region 42 of the lower layer absorbent body 40.

Here, when the body fluid is absorbed by the absorbent body in the lower absorbent body 40 having the compressed lines 41 formed therein, the body fluid is diffused first in time along the compressed lines 41 by capillary action and then diffused in the non-compressed regions 42. In this way, the time for diffusion of the body fluid differs between the portion where the compressed line 41 is formed and the non-compressed region 42. When the basis weight of the absorbent material constituting the absorbent body is low, the above-described difference in diffusion time does not become a serious problem, but when the basis weight of the absorbent material is increased in order to increase the absorption amount of body fluid, the absorption time of the non-compressed regions 42 becomes slower. Therefore, in particular, in the absorbent body having a high absorption amount, the time difference between the diffusion times of the body fluid is further increased in the portion where the compressed string 41 is formed and the non-compressed region 42, and in some cases, only the compressed string 41 may be wetted with the body fluid, and the body fluid may hardly be absorbed in the non-compressed region 42. Thus, with the above-described configuration, even when the slits 36 of the upper layer absorbent body 30 are positioned above the non-compressed regions 42 of the lower layer absorbent body 40, the non-compressed regions 42 allow bodily fluids to rapidly penetrate.

In the absorbent article of the present invention, the lower absorbent body 40 preferably has an intersection 43 where the compressed lines 41 intersect. In this case, the slits 36 of the upper layer absorber 30 preferably overlap with the intersection portions 43 of the lower layer absorber 40.

With the above-described structure, by positioning the intersection 43 of the compressed lines 41 of the lower absorbent layer 40 below the slits 36 of the upper absorbent layer 30, the body fluid quickly diffuses along the compressed lines 41. That is, the intersection 43 of the compressed line 41 can be said to function as a hinge of the body fluid diffusion path. Therefore, when the body fluid flowing down through the slits 36 of the upper layer absorbent body 30 contacts the intersection 43 of the lower layer absorbent body 40, the body fluid spreads widely around the intersection 43 to the lower layer absorbent body 40.

The absorbent article of the present invention may further include one or more additional absorbers 70 between the backsheet 20 and the lower absorber 40. In this case, at least one of the plurality of supplemental absorbers 70 preferably has a plurality of compressed lines 71 recessed in the absorber in the thickness direction.

By further providing the additional absorber 70 in the above-described structure, the absorption amount of the entire absorbent article can be increased. Further, by forming the compressed line 71 also in the additional absorbent body 70, the liquid diffusibility can be maintained.

In the absorbent article having the absorbent body with slits formed therein, the present invention can improve the diffusion of body fluid upward in the vertical direction, and the entire absorbent body can absorb body fluid even when the wearer assumes a standing position.

Drawings

Fig. 1 is a plan view showing an absorbent article according to embodiment 1 of the first invention.

Fig. 2 is a sectional view taken along line II-II shown in fig. 1.

Fig. 3 shows a state in which the upper layer absorbent body and the lower layer absorbent body of the absorbent article relating to embodiment 1 of the first invention are separated.

Fig. 4 shows a state in which the upper layer absorbent body and the lower layer absorbent body of the absorbent article relating to embodiment 1 of the first invention are overlapped.

Fig. 5 is an enlarged view of the crush line pattern formed on the upper layer absorbent body and the lower layer absorbent body.

Fig. 6 shows a state in which the upper layer absorbent body and the lower layer absorbent body of the absorbent article relating to embodiment 2 of the first invention are separated.

Fig. 7 shows a state in which the upper layer absorbent body and the lower layer absorbent body of the absorbent article relating to embodiment 2 of the first invention are overlapped.

Fig. 8 is an enlarged view of the crush line pattern formed on the upper layer absorbent body and the lower layer absorbent body.

Fig. 9 shows a state in which the upper layer absorbent body and the lower layer absorbent body of the absorbent article relating to embodiment 3 of the first invention are separated.

Fig. 10 shows a state in which the upper layer absorbent body and the lower layer absorbent body of the absorbent article relating to embodiment 3 of the first invention are overlapped.

Fig. 11 shows an example of the cross-sectional shapes of the upper layer absorber and the lower layer absorber.

Fig. 12 shows an example of the cross-sectional shapes of the upper layer absorber, the lower layer absorber, and the additional absorber.

Fig. 13 is a plan view showing an absorbent article relating to embodiment 1 of the second invention.

FIG. 14 is a cross-sectional view of the XIV-XIV line shown in FIG. 13.

Fig. 15 shows a state in which the upper layer absorbent body and the lower layer absorbent body of the absorbent article relating to embodiment 1 of the second invention are separated.

Fig. 16 shows a state in which the upper layer absorbent body and the lower layer absorbent body of the absorbent article relating to embodiment 1 of the second invention are superposed.

Fig. 17 shows a state in which the upper layer absorbent body and the lower layer absorbent body of the absorbent article relating to embodiment 2 of the second invention are separated.

Fig. 18 shows a state in which the upper layer absorbent body and the lower layer absorbent body of the absorbent article relating to embodiment 2 of the second invention are superposed.

Fig. 19 is an enlarged view of the crush line patterns formed on the upper and lower absorbent layers.

Fig. 20 shows a state in which the upper layer absorbent body and the lower layer absorbent body of the absorbent article relating to embodiment 3 of the second invention are separated.

Fig. 21 shows a state in which the upper layer absorbent body and the lower layer absorbent body of the absorbent article relating to embodiment 3 of the second invention are superposed.

Fig. 22 is an enlarged view of the crush line pattern formed on the upper and lower absorbent layers.

Fig. 23 shows a state in which the upper layer absorbent body and the lower layer absorbent body of the absorbent article relating to embodiment 4 of the second invention are separated.

Fig. 24 shows a state in which the upper layer absorbent body and the lower layer absorbent body of the absorbent article relating to embodiment 4 of the second invention are superposed.

Fig. 25 shows an example of a cross-sectional shape of the upper layer absorber and the lower layer absorber.

Fig. 26 shows an example of the cross-sectional shapes of the upper layer absorber, the lower layer absorber, and the additional absorber.

Detailed Description

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments described below, and includes modifications within the scope that will be apparent to those skilled in the art from the embodiments described below.

In the present specification, "a to B" means "a to B inclusive".

In the present specification, the "longitudinal direction" refers to a direction connecting a front body positioned on the abdominal side of a wearer and a rear body positioned on the back side of the wearer in an absorbent article. The "width direction" refers to a direction perpendicular to the longitudinal plane of the absorbent article. In fig. 1 of the present application, the longitudinal direction of the absorbent article is indicated by the Y-axis, and the width direction of the absorbent article is indicated by the X-axis.

In the present specification, the term "skin-facing surface" refers to a surface that faces the skin of a wearer when the absorbent article is worn. The term "skin non-facing surface" refers to a surface that does not face the skin of the wearer when the absorbent article is worn.

[ I. first invention ]

The structure of the invention (first invention) for solving the first problem will be described below with reference to fig. 1 to 12.

[ 1, embodiment 1 ]

An absorbent article according to embodiment 1 of the first invention will be described with reference to fig. 1 to 5. The absorbent article according to embodiment 1 is configured as a large diaper. Fig. 1 is a plan view of the entire absorbent article 100, and fig. 2 is a sectional view schematically showing a line II-II shown in fig. 1. In the cross-sectional view of fig. 2, in order to clearly show the structure of the absorbent article 100, although the various components are drawn with gaps provided therebetween, in reality, there are almost no gaps formed between the components.

As shown in fig. 1, the absorbent article 100 is divided in the longitudinal direction into a front body 1 positioned on the abdomen side of the wearer, a back body 2 positioned on the back side of the wearer, and a crotch portion 3 positioned between the front body and the back body. Specifically, the absorbent article 100 is formed into a shape that can be expressed as a gourd-shaped or hourglass shape in a plan view thereof. That is, the absorbent article 100 has a constricted portion, which is the narrowest width portion of the absorbent article 100, in the crotch portion 3. On the other hand, side flaps extending to the left and right outer sides in the width direction than the neckdown portion of the crotch portion 3 are present in the front body 1 and the back body 2 of the absorbent article 100. That is, the width of the front body 1 and the rear body 2 is formed wider than the neckdown portion of the crotch portion 3 at the portion where the side flap is formed. In this manner, the absorbent article 100 may be formed in a gourd shape (hourglass shape). However, the shape of the absorbent article 100 may be changed as appropriate, and may be formed in a simple rectangular shape, for example.

As shown in fig. 1 and 2, the absorbent article 100 basically has a liquid-permeable top sheet 10, a liquid-impermeable back sheet 20, and a plurality of absorbers 30 and 40 interposed between the top sheet and the back sheet. In the present specification, the absorbent body located on the topsheet 10 side is referred to as "upper layer absorbent body 30" (first absorbent body), and the absorbent body located on the backsheet 20 side is referred to as "lower layer absorbent body 40" (second absorbent body). As shown in the cross-sectional view of fig. 2, the upper layer absorber 30 and the lower layer absorber 40 overlap in the thickness direction thereof. The upper layer absorber 30 and the lower layer absorber 40 are bonded to each other with an adhesive such as a hot melt adhesive so as not to be displaced relative to each other. The top sheet 10 covers the skin-facing surface side of the laminated absorbers 30, 40, and the back sheet 20 covers the non-skin-facing surface side of the laminated absorbers 30, 40. As shown in fig. 1 and 2, the top sheet 10 and the back sheet 20 are joined to each other by a hot-melt adhesive, heat sealing, ultrasonic sealing, or the like around the respective absorbers 30, 40. Thereby, the absorbent members 30 and 40 are surrounded by the joined portion of the top sheet 10 and the backsheet 20. Further, a pair of three-dimensional creases 50 are formed on both the left and right sides in the width direction of the absorbent article 100. The pair of three-dimensional creases 50 stands on both the left and right sides of the absorbent body, and functions as a leakage preventing wall for preventing leakage of urine. The absorbent article 100 may further include a cover sheet 60 covering the non-skin-facing surface of the backsheet 20. Hereinafter, each member constituting the absorbent article 100 will be described.

The top sheet 10 is a sheet-like member that directly contacts the skin of the wearer's crotch and allows body fluid such as urine to penetrate through the absorbers 30, 40. Therefore, the top sheet 10 is made of a liquid-permeable material having high flexibility. The liquid permeable material constituting the top sheet 10 is, for example, a woven fabric, a nonwoven fabric or a porous film. Further, for example, a nonwoven fabric may be produced by hydrophilizing fibers of a thermoplastic resin such as polypropylene, polyethylene, polyester, or nylon. Examples of the nonwoven fabric include air-permeable nonwoven fabric, point-bonded nonwoven fabric, spunbonded nonwoven fabric, and meltblown nonwoven fabric.

The backsheet 20 is a sheet member for preventing body fluid, which has penetrated the top sheet 10 and has been absorbed by the absorbers 30, 40, from leaking to the outside of the diaper. Thus, the backsheet 20 is preferably constructed of a liquid impermeable material. The liquid-impermeable material constituting the back sheet 20 is, for example, a liquid-impermeable film composed of a polyethylene resin. Particularly, in order to ensure air permeability while maintaining liquid impermeability, the backsheet 20 is preferably a microporous polyethylene film having a plurality of fine pores of 0.1 to 4 μm.

The absorbers 30 and 40 are members for absorbing body fluids such as urine and holding the absorbed body fluids. The absorbers 30, 40 are disposed between the liquid-permeable top sheet 10 and the liquid-impermeable back sheet 20. The upper layer absorber 30 and the lower layer absorber 40 are preferably joined by a hot melt adhesive or the like so as not to be displaced relative to each other. Each of the absorbers 30 and 40 is composed of an absorbent material 34 or 44 and a core wrap sheet 35 or 45 wrapping the absorbent material 34 or 44. As the absorbent materials 34 and 44, for example, fluff pulp obtained by crushing fibrous materials such as coniferous trees and broadleaf trees, Super Absorbent Polymers (SAP), and hydrophilic sheets can be used. In addition, as the absorbent material 34, 44, one of fluff pulp, super absorbent polymer, and hydrophilic sheet may be used alone, or two or more thereof may be used in combination. In general, the absorbent materials 34, 44 are made of fluff pulp in which superabsorbent polymer is dispersed. The core covering sheets 35 and 45 are sheet-like members for covering the absorbent materials 34 and 44 to maintain the shapes thereof. As the core wrap sheets 35 and 45, a sheet-like member having liquid permeability is used. As the core wrap sheets 35 and 45, for example, tissue paper such as toilet paper or well-known nonwoven fabric can be used.

In the present invention, the upper layer absorber 30 and the lower layer absorber 40 are preferably different in size. In particular, in the present invention, the length and width of the upper layer absorber 30 are preferably smaller than those of the lower layer absorber 40. In this case, the upper layer absorber 30 is disposed on the upper surface of the lower layer absorber 40 so as to overlap with the crotch portion 3 of the absorbent article 100. This can increase the absorption amount of the crotch portion 3, which is large in the amount of body fluid discharged. However, the upper layer absorber 30 and the lower layer absorber 40 may have the same size and shape.

The pair of three-dimensional creases (50) stands on both the left and right sides of the absorbent body and serves as leakage preventing walls for preventing leakage of urine. The three-dimensional fold 50 is generally formed by a side panel 51 and one or more elastically stretchable members 52. The side sheet 51 is joined to the skin-facing surface of the top sheet 10 or the back sheet 20 at the outer side in the width direction of the crotch portion 3, and is open at the inner side in the width direction. Further, one or more elastic stretchable members 52 are fixed to the inner end portion of the opened side sheet 51 in an elongated state along the longitudinal direction. Therefore, as soon as the elastic stretchable member 52 contracts, the inner end portion of the side sheet 51 stands up with the contraction force of the elastic stretchable member 52, and wrinkles (gathers) are formed at the contracted portion of the elastic stretchable member 52. For the side sheet 51, for example, a nonwoven fabric sheet obtained by a method of producing card embossing (card embossed) or spun bonding or the like can be used, and particularly, a nonwoven fabric sheet using SMS or SMMS or the like having high water repellency and air permeability is preferable.

The cover sheet 60 is a member for reinforcing the back sheet 20 and improving the feel thereof. The cover sheet 60 is attached to the skin non-facing side of the back sheet 20. As a material constituting the cover sheet 60, woven fabric or nonwoven fabric is used. In particular, as a material constituting the cover sheet 60, a nonwoven fabric or a wet nonwoven fabric made of a thermoplastic resin such as polyethylene, polypropylene, or polyester is preferably used.

As shown in fig. 1 and 2, the absorbent article 100 of the present invention is characterized by the following: a plurality of compressed lines 31, 41 are formed in the absorber 30, 40 to make the absorber 30, 40 concave in the thickness direction. That is, the compressed lines 31 and 41 are formed in plural on each of the upper layer absorbent body 30 and the lower layer absorbent body 40. The compressed lines 31, 41 can be formed by partially compressing the respective absorbers 30, 40 from both sides or either side of the skin-facing surface side and the skin-non-facing surface side. Therefore, the density of the absorbent materials 34, 44 of the respective absorbers 30, 40 is increased at the portions where the compressed lines 31, 41 are formed. The compressed lines 31 formed in the upper layer absorbent body 30 and the compressed lines 41 formed in the lower layer absorbent body 40 are formed in a pattern that at least partially cross each other when viewed in a planar direction. The pattern of the compressed lines 31 formed on the upper layer absorbent body 30 and the pattern of the compressed lines 41 formed on the lower layer absorbent body 40 will be described in detail below.

Fig. 3(a) and (b) are top views conceptually showing the upper absorber 30 and the lower absorber 40 separated and laterally aligned. Fig. 3(c) and (d) are cross-sectional shapes of the absorbers 30 and 40 schematically showing the line III-III. Fig. 4(a) shows a state where the upper layer absorber 30 and the lower layer absorber 40 are overlapped, and fig. 4(b) shows a cross-sectional shape of the absorber schematically showing the line IV-IV. Fig. 5 is an enlarged view showing the pattern of the compressed lines 31 formed on the upper layer absorber 30 and the pattern of the compressed lines 41 formed on the lower layer absorber 40.

As shown in fig. 3 to 5, the compressed lines 31 are formed in a square lattice pattern on the upper layer absorbent body 30. The "square lattice pattern" as used herein means a pattern in which a plurality of extrusion lines extending in parallel with the longitudinal direction intersect a plurality of extrusion lines extending in parallel with the width direction to define square non-extruded regions. In particular, in the present embodiment, the compressed line 31 forms a regular pattern (square lattice pattern) in which all of the four non-compressed regions 32 surrounded by the compressed line 31 are square in the pattern on the upper absorbent body 30. In this manner, it is conceivable that a plurality of compressed lines 31, non-compressed regions 32 surrounded by the compressed lines 31, and intersecting point portions 33 where the compressed lines 31 intersect are formed in the upper layer absorbent body 30. Hereinafter, for convenience, the extrusion line 31 of the upper layer absorbent body 30 is referred to as "upper extrusion line 31", the non-extrusion region 32 is referred to as "upper non-extrusion region 32", and the intersection 33 is referred to as "upper intersection 33".

On the other hand, the compressed lines 41 are formed in a rhombus lattice pattern on the lower layer absorber 40. The "rhombic lattice pattern" as used herein means a pattern in which a plurality of extrusion lines extending in directions inclined with respect to the longitudinal direction and the width direction intersect to define a rhombic (rhombic) non-extrusion region. In particular, in the present embodiment, the pattern of the compressed lines 41 on the lower layer absorbent body 40 forms a regular pattern (regular rhombus lattice pattern) in which all of the non-compressed regions 42 in the four directions surrounded by the compressed lines 41 are in the shape of a regular rhombus (rhombus). In this manner, the lower layer absorbent body 40 may be thought of as having a plurality of compressed strands 41, non-compressed regions 42 surrounded by the compressed strands 41, and intersecting point portions 43 where the compressed strands 41 intersect. Hereinafter, for convenience, the compressed line 41 of the lower absorbent body 40 is referred to as "lower compressed line 41", the non-compressed region 42 is referred to as "lower non-compressed region 42", and the intersection 43 is referred to as "lower intersection 43".

In the present embodiment, the upper side compressed line 31 is formed by compressing and recessing the upper layer absorbent body 30 from the skin-facing surface side. Similarly, the lower side compressed line 41 is formed by compressing and recessing the lower layer absorber 40 from the skin-facing surface side. Therefore, in a state where the lower absorbent body 40 is overlapped with the upper absorbent body 30 at a portion where the lower compressed line 41 is formed in the lower absorbent body 40, a gap is formed between the upper absorbent body 30 and the lower absorbent body 40.

Fig. 4 and 5 show a state in which the pattern of the square lattice-shaped upper pressing lines 31 and the pattern of the square lattice-shaped lower pressing lines 41 are superimposed. As can be seen from the figures, in the present embodiment, the area of the upper non-pressing region 32 is larger than the area of the lower non-pressing region 42. Therefore, when the upper layer absorbent body 30 and the lower layer absorbent body 40 are superposed, the lower non-compressed regions 42 (square) are accommodated in the upper non-compressed regions 32 (square).

In the present embodiment, the four lower intersection portions 43 defining the certain lower non-compressed region 42 (square) overlap the upper compressed lines 31 defining the four sides of the certain upper non-compressed region 32 (square). Therefore, as shown in fig. 4 and 5, it is understood that the lower non-compressed region 42 (right rhombus) is just accommodated in the range of the upper non-compressed region 32 (square). That is, the center (intersection of diagonal lines) of the upper non-compressed region 32 (square) coincides with the center (intersection of diagonal lines) of the lower non-compressed region 42 (right-angled square). As shown in fig. 3, the length L in the longitudinal direction of the upper non-compressed region 32 (square) is substantially equal to the length D1 of the diagonal line along the longitudinal direction of the lower non-compressed region 42 (right diagonal) (L — D1). Further, the length B in the width direction of the upper non-pressed region 32 (square) and the length D2 along the diagonal line in the width direction of the lower non-pressed region 42 are approximately equal (B — D2). In the present specification, the term "approximately" means an allowable error of ± 5%. By satisfying these conditions, the four lower intersection points 43 defining a certain lower non-compressed region 42 (square) overlap the upper compressed lines 31 defining the four sides of the upper non-compressed region 32 (square).

As shown in fig. 4 and 5, the upper intersection portions 33 overlap the centers (intersections of diagonal lines) of the lower non-compressed regions 42 (right-angled squares). In another view, in the plurality of lower non-compressed regions 42 (right rhombuses), there are those where the upper intersection portions 33 overlap and those where the upper intersection portions 33 do not overlap. In the example shown in fig. 4 and 5, it is understood that, among the plurality of rows of the lower non-compressed region 42, every other row, a row in which the upper intersection portions 33 overlap and a row in which the upper intersection portions 33 do not overlap are alternately arranged. Similarly, it is found that, among the plurality of rows of the lower non-compressed region 42, every other row, the row in which the upper intersection portions 33 overlap and the row in which the upper intersection portions 33 do not overlap are alternately arranged.

As described above, by forming the pattern of the upper side compressed lines 31 (square lattice shape) and the pattern of the lower side compressed lines 41 (regular rhombic lattice shape), even if the compressed lines are not densely formed on one absorbent body, the bodily fluid can be efficiently diffused to the non-compressed region, and the bodily fluid can be absorbed over a wide range of the entire absorbent body of the two layers. That is, the body fluid that has spread along the upper side compressed line 31 of the upper layer absorbent body 30 is absorbed by the lower side non-compressed region 42 of the lower layer absorbent body 40. Therefore, the body fluid diffused along the upper side compressed line 31 of the upper layer absorbent body 30 is less likely to reach the end portion, and the leakage to the outside can be effectively prevented. Further, since the body fluid can be absorbed over a wide range in the two-layered absorbers 30 and 40, the amount of body fluid absorbed is increased, and the wearer is less likely to feel uncomfortable even if worn for a long time. At the intersection portions 33, 43 formed on the respective absorbers 30, 40, the compressed lines 31, 41 intersect with each other, so that the body fluid is likely to accumulate therein. By overlapping the upper intersection 33 of the upper layer absorbent body 30 and the lower non-compressed region 42 of the lower layer absorbent body 40, the body fluid retained in the upper intersection 33 can efficiently permeate into the lower non-compressed region 42.

In addition, as in the present embodiment, by making the rows and columns of the lower non-compressed region 42 where the upper intersection portions 33 overlap each other every other row and every other column, the body fluid that has permeated into the upper absorbent body 30 can be diffused to a further region. Therefore, the body fluid that has permeated into the upper layer absorbent body 30 can be diffused and permeated into a wide range of the lower layer absorbent body 40.

Furthermore, the extrusion line has the following functions: the liquid is flowed as a groove and diffused to a non-pressing region around the pressing portion along the pressing portion by capillary action. Even when the function is not used as a groove, the liquid is transferred from the compressed line of the absorbent body on one side to the compressed line or non-compressed region of the absorbent body on the other side. The reason for this is as follows. In short, the crush lines deform the absorbent material constituting the absorbent body by pressure. Therefore, the absorbent body changes in thickness as soon as it absorbs liquid at the portion where the compressed lines are formed. That is, since the pulp or SAP in the extrusion line absorbs, the interval between the pulps is sometimes loosened and the SAP swells, the extrusion line becomes gradually shallower, and the final thickness is almost the same as the non-extrusion region after swelling. In this way, even if the compressed line has a depth before absorption, the depth gradually becomes shallower as absorption proceeds. Therefore, it is easy to transfer liquid from the compressed line of the absorbent body on one side to the compressed line or non-compressed region provided on the absorbent body on the other side overlapping therewith. That is, since the extrusion line forms the groove in the initial state, the liquid flows into the extrusion line preferentially. Then, since the compressed lines swell as soon as the portions where the compressed lines are formed are absorbed, the liquid moves to the compressed lines or non-compressed regions provided on the other side of the absorbent body overlapping the swollen compressed lines as described above.

Here, specific numerical values of components of the absorbent article will be described. For example, the thickness of each absorbent body 30, 40, i.e., the thickness of the non-compressed regions 32, 42 is preferably 5mm to 20mm, and particularly preferably 8mm to 15 mm. The thickness of each absorbent body 30, 40 at the portions where the compressed lines 31, 41 are formed is preferably 1mm to 10mm, and particularly preferably 2mm to 5 mm. However, the thickness of the portions where the pressing lines 31, 41 are formed is naturally smaller than the thickness of the non-pressing regions 32, 42. For example, the thickness of the portions where the extrusion lines 31 and 41 are formed is 3% to 50%, particularly preferably 5% to 20%, of the thickness of the non-extrusion regions 32 and 42.

The width of each extrusion line 31, 41 is preferably 1mm to 5mm, and particularly preferably 2mm to 4 mm. The length L of the upper non-compressed region 32 shown in fig. 2 is preferably 10mm to 50mm, and particularly preferably 20mm to 40mm or 30 mm. The preferred range of values for the width B of the upper non-compressed region 32 is the same as the length L described above. The length L and width B are preferably approximately equal, but may be different. That is, the shape of the upper non-pressed region 32 is not limited to the square shape, and may be other quadrangles. The length D1 of the diagonal line in the longitudinal direction of the lower non-compressed region 42 shown in fig. 2 is preferably 10mm to 50mm, and particularly preferably 20mm to 40mm or 30 mm. The preferable range of the length D2 of the diagonal line in the width direction of the lower non-pressed region 42 is the same as the above-mentioned length D1. The length D1 and the length D2 are preferably slightly equal, but may be different. That is, the shape of the lower non-pressed region 42 is not limited to a regular rhombus (regular diamond shape), and may be other rhombuses. In addition, as mentioned above, although the length L is slightly equal to the length D1 and the width B is slightly equal to the length D2 are preferred embodiments, the invention is not limited thereto.

In order to spread the body fluid discharged to the vicinity of the crotch portion widely to the front body and the back body, the compressed lines 31, 41 formed in the respective absorbers 30, 40 are preferably formed over a wide range in the longitudinal direction. Specifically, the length of the region in the longitudinal direction in which the compressed lines 31, 41 are formed is preferably 60% or more, and particularly preferably 60% to 100%, 70% to 100%, or 80% to 100%, with respect to the length of each absorbent body 30, 40 in the longitudinal direction. In order to spread the body fluid discharged to the vicinity of the center in the width direction to the outside in the width direction, the compressed lines 31, 41 formed on the respective absorbers 30, 40 are preferably formed over a wide range in the width direction. Specifically, the maximum width in the width direction of the region in which the compressed lines 31, 41 are formed is preferably 60% or more, and particularly preferably 60% to 100%, 70% to 100%, or 80% to 100%, with respect to the minimum width in the width direction of each absorbent body 30, 40.

In the present embodiment, an example is described in which the upper extrusion lines 31 are formed in a square lattice pattern in which the area of the non-extrusion regions is relatively large, and the lower extrusion lines 41 are formed in a regular rhombic lattice pattern in which the area of the non-extrusion regions is relatively small. However, the pattern of the pressing line may be exchanged between the upper pressing line 31 and the lower pressing line 41. That is, the square lattice pattern described above may be applied as the pattern of the lower extrusion line 41, and the regular rhombic lattice pattern may be applied as the pattern of the upper extrusion line 31.

In the figure, the compressed lines 31 and 41 are shown as examples formed by recessing both the absorbent materials 34 and 44 and the core wrap sheets 35 and 45 constituting the respective absorbers 30 and 40. However, the compressed lines 31, 41 may be formed by compressing and recessing at least the absorbent materials 34, 44. That is, after the absorbent materials 34 and 44 are compressed to form the crush lines 31 and 41, the core wrap sheets 35 and 45 may be joined to wrap the absorbent materials 34 and 44. In this sense, it is sufficient that the compressed lines 31, 41 are formed on the absorbent materials 34, 44 constituting the respective absorbers 30, 40.

[ 2, 2 nd embodiment ]

Next, an absorbent article according to embodiment 2 of the first invention will be described with reference to fig. 6 to 8. In embodiment 2, the same structure as that of embodiment 1 is not described, and a structure different from that of embodiment 1 will be mainly described.

FIGS. 6(a) and (b) show the upper layer absorber 30 and the lower layer absorber 40 as separated from each other, and FIGS. 6(c) and (d) show cross-sectional shapes of VI to VI. Fig. 7(a) shows a state where the upper layer absorber 30 and the lower layer absorber 40 are overlapped, and fig. 7(b) shows a sectional shape of VII-VII. Fig. 8 is an enlarged view showing the pattern of the compressed lines 31 formed on the upper layer absorber 30 and the pattern of the compressed lines 41 formed on the lower layer absorber 40. Further, in fig. 6 and 7, only the upper absorber 30 and the lower absorber 40 are conceptually shown in outline. Although not shown in fig. 6 and 7, embodiment 2 described herein may also include at least the top sheet 10 and the back sheet 20, and may further include a pair of three-dimensional creases 50 and a cover sheet 60, as in embodiment 1.

Embodiment 2 is different from embodiment 1 in the pattern of the compressed lines 31, 41 formed on the respective absorbers 30, 40. As shown in fig. 6 to 8, the upper layer absorber 30 has upper compressed lines 31 formed in a regular rhombic lattice pattern, and the lower layer absorber 40 has lower compressed lines 41 formed in a square lattice pattern. The regular rhombic lattice pattern referred to here is basically the same as the square lattice pattern described in embodiment 1. However, in embodiment 2, the relative positional relationship between the regular rhombic lattice-shaped pattern formed on the upper layer absorber 30 and the square lattice-shaped pattern formed on the lower layer absorber 40 in the state where the upper layer absorber 30 and the lower layer absorber 40 are overlapped is different from that in embodiment 1.

As shown in fig. 7 and 8, in embodiment 2, the upper intersection 33 of the upper layer absorber 30 and the lower intersection 43 of the lower layer absorber 40 overlap each other in a state where the absorbers 30 and 40 overlap each other. Further, among the plurality of upper side intersection portions 33 of the upper layer absorbent body 30, there is one that overlaps with the center (intersection of diagonal lines) of the lower side non-compressed region 42 of the lower layer absorbent body 40. In particular, in the range where the pattern of the upper side compressed line 31 of the upper layer absorbent body 30 overlaps the pattern of the lower side compressed line 41 of the lower layer absorbent body 40, the upper side intersection 33 exists in the range of all the lower side non-compressed regions 42. Therefore, in embodiment 2, it is found that the upper pressing line 31 overlaps a position corresponding to a diagonal line of the lower non-pressing region 42 formed in a square shape. In embodiment 2, it is understood that the lower pressing line 41 overlaps the upper non-pressing region 32.

In this way, in embodiment 2, the lower pressing line 41 overlaps the upper non-pressing region 32, the upper pressing line 31 and the upper intersection portion 33 overlap the lower non-pressing region 42, and the upper intersection portion 33 overlaps the lower intersection portion 43. Therefore, the body fluid diffused along the upper side compressed line 31 of the upper layer absorbent body 30 falls onto the lower layer absorbent body 40 and is absorbed by the lower side non-compressed region 42. The body fluid accumulated in the upper intersection 33 of the upper layer absorbent body 30 falls onto the lower layer absorbent body 40, and spreads along the lower side compressed line 41 through the lower intersection 43. Further, the body fluid diffused along the lower side compressed line 41 of the lower layer absorbent body 40 is absorbed by the upper side non-compressed region 32 of the upper layer absorbent body 30. The lower squeeze thread 41 may diffuse the body fluid in a direction diagonal to the lattice pattern of the upper squeeze thread 31. By forming such a pattern, even in the non-compressed regions 32 and 42, which have been conventionally regarded as having a slow absorption time, body fluid can be introduced quickly.

Thus, the pattern of embodiment 2 can be said to have a higher absorption rate of body fluid than the pattern of embodiment 1. In contrast, the pattern of embodiment 1 can be said to have a wider spread range of the body fluid than the pattern of embodiment 2. The pattern of embodiment 1 and the pattern of embodiment 2 may be used in consideration of the performance required for the absorbent article and may be determined as appropriate.

The width of each of the extrusion lines 31 and 41, the length D1 of the diagonal line in the longitudinal direction of the upper non-extrusion region 32, the length D2 of the diagonal line in the width direction, or the length L or the width B of the lower non-extrusion region 42 in the longitudinal direction are preferably within the same ranges as in embodiment 1.

[ 3. 3 rd embodiment ]

Next, an absorbent article according to embodiment 3 of the first invention will be described with reference to fig. 9 to 10. FIGS. 9(a) and (b) show the upper layer absorber 30 and the lower layer absorber 40 as separated from each other, and FIGS. 9(c) and (d) show the cross-sectional shape IX-IX. Fig. 10(a) shows a state where the upper layer absorber 30 and the lower layer absorber 40 are overlapped, and fig. 10(b) shows a cross-sectional shape of X-X. Fig. 9 and 10 are conceptual only in outline showing the upper absorber 30 and the lower absorber 40. Although not shown in the drawings, embodiment 3 described herein may further include at least the top sheet 10 and the back sheet 20, and may further include a pair of three-dimensional folds 50 and a cover sheet 60, as in embodiment 1 described above.

In embodiment 3, a plurality of upper side compressed lines 31 extending in the longitudinal direction are formed in the upper layer absorbent body 30. In the illustrated example, the upper layer absorbent body 30 has a center compressed line 31a located at the center in the width direction, a left compressed line 31b located on the left, and a right compressed line 31c located on the right. The compressed threads 31a, 31b, and 31c extend from the front body to the back body of the upper layer absorbent body 30 through the crotch portion. The central pressing line 31a is formed in a straight line shape along the entire length direction. In contrast, the left extrusion line 31b and the right extrusion line 31c are respectively divided into a linear front linear portion 31d located at the end of the front body 1, a linear rear linear portion 31e located at the end of the rear body, and a linear crotch linear portion 31f located on the inner side in the width direction of the crotch portion 3 than the front linear portion 31d and the rear linear portion 31 e. The left squeeze thread 31b and the right squeeze thread 31c have a front inclined portion 31g inclined obliquely so as to connect the front straight portion 31d and the crotch straight portion 31f, and a rear inclined portion 31h inclined obliquely so as to connect the rear straight portion 31e and the crotch straight portion 31f, respectively. Thereby, the interval between the center compressed line 31a and the left and right compressed lines 31b and 31c is relatively separated on the front body side and the rear body side, and relatively close to each other in the crotch portion. Since the crotch portion of the upper layer absorbent body 30 is a portion that is likely to contact body fluid excreted from the crotch of the wearer, the body fluid is likely to diffuse in the longitudinal direction by narrowing the interval between the compressed lines 31 in this portion. In the present embodiment, no compressed line extending in the width direction is formed on the upper layer absorbent body 30. Therefore, the upper layer absorbent body 30 does not have the intersection of the compressed lines.

On the other hand, a plurality of lower side compressed lines 41 extending in the width direction are formed in the lower layer absorber 40. In the illustrated example, linear lower compressed lines 41 extending in the width direction are arranged at regular intervals in the longitudinal direction from the front body to the back body in the lower layer absorber 40. In the present embodiment, no compressed line extending in the longitudinal direction is formed on the lower layer absorber 40. Therefore, the lower absorbent body 40 does not have the intersection of the compressed lines.

When the upper layer absorbent body 30 and the lower layer absorbent body 40 are superposed in the thickness direction, as shown in fig. 10, the upper side compressed line 31 of the upper layer absorbent body 30 and the lower side compressed line 41 of the lower layer absorbent body 40 intersect. By thus intersecting the plurality of upper side compressed lines 31 extending in the longitudinal direction with the compressed lines of the absorbent body extending on the other side in the width direction, the body fluid can be diffused in the longitudinal direction and also in the width direction. In particular, the body fluid is difficult to spread in the longitudinal direction, and the body fluid is likely to leak from the end in the width direction. Therefore, the upper layer absorber 30 is formed with an upper side compressed line 31 extending in the longitudinal direction, and the lower layer absorber 40 is formed with a lower side compressed line 41 extending in the width direction. This makes it possible to diffuse the body fluid that first contacts the upper layer absorbent body 30 in the longitudinal direction and thereafter to diffuse the body fluid that has permeated the lower layer absorbent body 40 in the width direction in an assisted manner. As a result, the body fluid can be effectively diffused in the longitudinal direction, and leakage from the end in the width direction can be prevented.

[ 4 ] example of sectional shape of absorber ]

In the above-described embodiments 1, 2 and 3, the example in which the compressed lines 31 and 41 are formed so as to recess the skin-facing surfaces of the upper layer absorbent body 30 and the lower layer absorbent body 40 has been described. However, the invention is not so limited. Next, another example of the cross-sectional shape of each absorbent body will be described.

Fig. 11 shows an example of the cross-sectional shapes of the upper layer absorber 30 and the lower layer absorber 40. In the example shown in fig. 11(a), the compressed line 31 of the upper layer absorber 30 is recessed on the skin non-facing surface side, and the compressed line 41 of the lower layer absorber 40 is recessed on the skin facing surface side. Therefore, the upper layer absorber 30 and the lower layer absorber 40 have the compressed lines 31 and 41 formed on the surfaces facing each other. In this way, a gap is formed between the upper layer absorber 30 and the lower layer absorber 40 at the portions where the compressed lines 31 and 41 are formed. Thereby, the body fluid that has flowed down from the upper absorbent body 30 to the lower absorbent body 40 spreads over a wide range of the lower absorbent body 40.

In the example shown in fig. 11(b), the compressed line 31 of the upper layer absorber 30 is recessed on both the skin-facing surface side and the non-skin-facing surface side, and the compressed line 41 of the lower layer absorber 40 is recessed only on the skin-facing surface side. By recessing both the skin-facing surface side and the non-skin-facing surface side of the upper layer absorbent body 30 in this manner, a larger space gap can be secured in the gap between the upper layer absorbent body 30 and the lower layer absorbent body 40 while maintaining the diffusibility of the bodily fluid on the surface of the upper layer absorbent body 30. Therefore, the body fluid can be spread over a wide range in both the upper layer absorber 30 and the lower layer absorber 40.

In the example shown in fig. 11(c), the compressed line 31 of the upper layer absorber 30 is recessed on both the skin-facing surface side and the skin non-facing surface side, and the compressed line 41 of the lower layer absorber 40 is also recessed on both the skin-facing surface side and the skin non-facing surface side. With this, similarly to the example shown in fig. 11(b), a larger space gap can be secured in the gap between the upper layer absorbent body 30 and the lower layer absorbent body 40 while maintaining the diffusion of the bodily fluid on the surface of the upper layer absorbent body 30. Further, by recessing both the skin-facing surface side and the non-skin-facing surface side of the lower absorbent body 40, the body fluid can be effectively permeated while maintaining the diffusibility on the front surface of the lower absorbent body 40 and further continuing to the back surface side of the lower absorbent body 40. That is, the backsheet 20 is disposed on the back side of the lower layer absorber 40 (see fig. 2). Further, by providing a gap between the lower absorbent body 40 and the backsheet 20, the body fluid that has reached the backsheet 20 is further diffused by the compressed lines 41 of the lower absorbent body 40, and is absorbed by the back surface side of the lower absorbent body 40. In this way, the entire upper layer absorber 30 and the entire lower layer absorber 40 can absorb body fluid.

In the example shown in fig. 11(d), the compressed line 31 of the upper layer absorber 30 is recessed on the skin-facing surface side, and the compressed line 41 of the lower layer absorber 40 is recessed on the non-skin-facing surface side. Therefore, the upper layer absorber 30 and the lower layer absorber 40 are joined substantially without a gap. In this manner, the upper absorber 30 and the lower absorber 40 may be joined without forming a gap therebetween.

Fig. 12 shows an example of an absorbent article further including an additional absorbent body 70 (third absorbent body) in addition to the upper absorbent body 30 and the lower absorbent body 40. In the example of fig. 12, the additional absorbent body 70 is disposed on the skin-facing surface side of the upper absorbent body 30, that is, between the upper absorbent body 30 and the top sheet 10 (see fig. 2). However, the additional absorber 70 may be disposed on the side of the lower absorber 40 not facing the skin, that is, between the lower absorber 40 and the backsheet 20 (see fig. 2). The additional absorbent body 70 preferably has a plurality of compressed lines 71, as in the upper absorbent body 30 and the lower absorbent body 40. As shown in fig. 12, the compressed line 71 may be formed by recessing the skin-facing surface side of the additional absorbent body 70, or may be formed by recessing the non-skin-facing surface side of the additional absorbent body 70. The pattern of the compressed line 71 of the additional absorbent body 70 is not particularly limited, and the compressed line pattern described in embodiments 1, 2, and 3 can be appropriately applied. Although not shown, one or more absorbers may be further stacked in addition to the additional absorber 70.

As described above, in the present specification, in order to express the contents of the present invention, embodiments of the present invention are explained with reference to the drawings. However, the present invention is not limited to the above embodiments, and obviously includes modifications and improvements that are obvious to those skilled in the art based on the matters described in the present specification.

For example, the extrusion lines forming the lattice pattern described in embodiment 1 and embodiment 2 may be combined with the extrusion lines extending in one of the longitudinal direction and the width direction described in embodiment 3. That is, of the two absorbent bodies stacked, one absorbent body may have a plurality of non-compressed regions surrounded by compressed lines, and the other absorbent body may have a plurality of compressed lines extending in the longitudinal direction or the width direction. For example, not only the compressed lines in a square lattice shape shown in fig. 3(a) may be formed on the upper layer absorbent body 30, but also a plurality of compressed lines extending in the width direction shown in fig. 9(b) may be formed on the lower layer absorbent body 40, and vice versa. For example, not only the upper layer absorbent body 30 may have a plurality of compressed lines extending in the longitudinal direction as shown in fig. 9(a), but also the lower layer absorbent body 40 may have compressed lines in a rhombic lattice shape as shown in fig. 3(b), or vice versa.

[ II, second invention ]

Hereinafter, a structure of an invention (second invention) for solving the second problem will be described with reference to fig. 13 to 26. In the second invention, the structure common to the first invention is not described, and the point different from the first invention will be mainly described.

[ 1, embodiment 1 ]

An absorbent article according to embodiment 1 of the second invention will be described with reference to fig. 13 to 16. The absorbent article according to embodiment 1 is configured as a large diaper. Fig. 13 is a plan view of the entire absorbent article 100, and fig. 14 is a sectional view schematically showing the XIV-XIV line shown in fig. 13. In the cross-sectional view of fig. 14, in order to clearly show the structure of the absorbent article 100, although the various components are drawn with gaps provided therebetween, in reality, almost no gaps are formed between the components.

As shown in fig. 13, the absorbent article 100 is divided into a front body 1 positioned on the abdomen side of the wearer, a back body 2 positioned on the back side of the wearer, and a crotch portion 3 positioned between the front body and the back body in the longitudinal direction. Specifically, the absorbent article 100 is formed into a shape that can be expressed as a gourd-shaped or hourglass shape in a plan view thereof. This point is common to the first invention described above.

As shown in fig. 13 and 14, the absorbent article 100 basically has a liquid-permeable top sheet 10, a liquid-impermeable back sheet 20, and a plurality of absorbers 30 and 40 interposed between the top sheet and the back sheet. In the present specification, the absorbent body located on the topsheet 10 side is referred to as "upper layer absorbent body 30" (first absorbent body), and the absorbent body located on the backsheet 20 side is referred to as "lower layer absorbent body 40" (second absorbent body). As shown in the cross-sectional view of fig. 14, the upper layer absorber 30 and the lower layer absorber 40 overlap in the thickness direction thereof. The upper layer absorber 30 and the lower layer absorber 40 are bonded to each other with an adhesive such as a hot melt adhesive so as not to be displaced relative to each other. The top sheet 10 covers the skin-facing surface side of the laminated absorbers 30, 40, and the back sheet 20 covers the non-skin-facing surface side of the laminated absorbers 30, 40. As shown in fig. 13 and 14, the top sheet 10 and the back sheet 20 are joined to each other around the respective absorbers 30, 40 by a hot-melt adhesive, heat sealing, ultrasonic sealing, or the like. Thereby, the absorbent members 30 and 40 are surrounded by the joined portion of the top sheet 10 and the backsheet 20. Further, a pair of three-dimensional creases 50 are formed on both the left and right sides in the width direction of the absorbent article 100. The pair of three-dimensional creases 50 stands on both the left and right sides of the absorbent body, and functions as a leakage preventing wall for preventing leakage of urine. The absorbent article 100 may further include a cover sheet 60 covering the non-skin-facing surface of the backsheet 20. The basic structure of each element (10, 20, 30, 40, 50, 60) of the absorbent article 100 is common to the first invention described above.

Fig. 15(a) and (b) are top views conceptually showing the upper absorber 30 and the lower absorber 40 separated and laterally aligned. Fig. 15(c) and (d) are cross-sectional shapes of the absorbers 30 and 40 schematically showing the XV-XV line. Fig. 16(a) shows a state where the upper layer absorber 30 and the lower layer absorber 40 are overlapped, and fig. 16(b) shows a cross-sectional shape of the absorber schematically showing the line XVI-XVI.

As shown in fig. 13 to 16, slits 36 penetrating in the thickness direction are formed in the upper layer absorber 30. In the present embodiment, the slit 36 is formed in an elongated, substantially elliptical shape extending in the longitudinal direction about the crotch portion 3 of the absorbent article 100. The slit 36 is formed in a hole shape with both ends closed in the longitudinal direction. The slit 36 is preferably located at least partially in the crotch portion 3 of the absorbent article 100, and may extend in the longitudinal direction from the crotch portion 3 to the front body 1 and the back body 2.

In fig. 15, the longitudinal length of the slit 36 is denoted by reference numeral S1, and the width (width) is denoted by reference numeral S2. For example, when the longitudinal length of the entire upper layer absorbent body 30 is 100%, the length S1 of the slits 36 may be 20% to 100% or 25% to 80%. For example, when the length (width) in the width direction of the upper layer absorbent body 30 (the minimum value of the width in the case where there are wide portions and narrow portions) is 100%, the width S2 of the slit 36 may be 10% to 50% or 15% to 30%. The slit 36 has a function of introducing body fluid into the lower layer absorbent body 40, and therefore the width S2 is preferably 5mm or more.

In the present embodiment, a plurality of compressed lines 31 are formed on the upper layer absorbent body 30. The plurality of compressed lines 31 (hereinafter referred to as "upper compressed lines") of the upper layer absorbent body 30 can be formed by partially compressing the upper layer absorbent body 30 from both sides or either side of the skin-facing surface side and the skin non-facing surface side. Therefore, the density of the absorbent material 34 of the upper layer absorbent body 30 is increased at the portions where the upper side compressed lines 31 are formed. In the present embodiment, the upper side compressed line 31 is formed by compressing the upper layer absorbent body 30 from the skin surface side.

The plurality of upper squeeze lines 31 include a center squeeze line 31a located at the center in the width direction, a left squeeze line 31b located on the left side, and a right squeeze line 31c located on the right side, on each of the front body 1 side and the rear body 2 side. In the illustrated example, a total of 6 extrusion lines are formed. These upper side compressed lines 31 have portions extending in the longitudinal direction of the upper layer absorbent body 30. Therefore, the body fluid contacting the upper layer absorbent body 30 is diffused in the longitudinal direction along the upper side compressed lines 31. More specifically, the front and rear center compressed lines 31a are each formed in a straight line extending in the longitudinal direction, and one end thereof reaches the longitudinal end edge of the upper layer absorbent body 30, and the other end thereof reaches the slit 36. The front and rear left compressed lines 31b and right compressed lines 31c include a straight portion 37a extending from the longitudinal end edge of the upper absorbent body 30 toward the lower crotch portion 3, and an inclined portion 37b extending obliquely inward in the width direction so as to connect the straight portion 37a and the slit 36.

As described above, in the present embodiment, all of the plurality of upper pressing lines 31 are formed so as to be connected to the slit 36. Accordingly, the body fluid excreted from the crotch of the wearer is first introduced into the slit 36 and temporarily stored, and then diffused in the longitudinal direction along the upper side compressed lines 31 connected to the slit 36. Since the slits 36 and the upper side compressed lines 31 form a plurality of diffusion paths in this manner, the entire upper layer absorbent body 30 can absorb body fluid, the absorption amount and the absorption rate are improved, and leakage of body fluid can be prevented more reliably. Further, the slit 36 is connected to a part of the upper side compressed line 31, and the body fluid temporarily accumulated in the slit 36 is easily diffused along the upper side compressed line 31. In particular, since the bodily fluid can be diffused from the wall surface inside the slit 36 along the upper side compressed line 31, the diffusion of the bodily fluid into the upper layer absorbent body 30 can be improved. In the present embodiment, no compressed line extending in the width direction is formed on the upper layer absorbent body 30. Therefore, the upper layer absorbent body 30 does not have the intersection of the compressed lines.

Further, a plurality of compressed lines 41 are also formed on the lower layer absorber 40. The plurality of compressed lines 41 (hereinafter referred to as "lower compressed lines") of the lower absorbent body 40 can be formed by partially compressing the lower absorbent body 40 from both or either of the skin-facing surface side and the non-skin-facing surface side. Therefore, the density of the absorbent material 44 of the lower absorbent body 40 is increased at the portions where the lower compressed lines 41 are formed. In the present embodiment, the lower side compressed line 41 is formed by compressing the lower layer absorber 40 from the skin-facing surface side.

In the present embodiment, each of the plurality of compressed lines 41 of the lower layer absorber 40 is formed to extend in the width direction of the absorbent article 100. In the illustrated example, linear lower compressed lines 41 extending in the width direction are arranged at regular intervals in the longitudinal direction from the front body to the back body in the lower layer absorber 40. In the present embodiment, no compressed line extending in the longitudinal direction is formed on the lower layer absorber 40. Therefore, the intersection of the compressed lines does not exist on the lower absorbent body 40.

In fig. 15, the length (width) of the lower squeeze line 41 in the width direction is denoted by reference numeral W. The lower side compressed line 41 is for spreading the body fluid contacting the lower layer absorbent body 40 widely in the width direction of the lower layer absorbent body 40. Therefore, the width W of the lower layer compressed line 41 is preferably 50% to 100% or 70% to 95% when the length (width) of the lower layer absorbent body 40 in the width direction (the minimum value of the width in the case where there are wide and narrow portions) is 100%. The width W of the lower side compressed line 41 preferably exceeds the width S2 of the slits 36 of the upper layer absorbent body 30 (W > S2). Specifically, the width W of the lower extrusion line 41 is preferably 110% or more, 150% or more, 200% or more, or 250% or more with respect to the width S2 of the slit 36. The upper limit of the width W of the lower pressing line 41 with respect to the value of the width S2 of the slit 36 is not particularly limited, and may be set to, for example, 10 times the degree.

Fig. 16 shows a state in which the upper layer absorber 30 and the lower layer absorber 40 are stacked in the thickness direction. As shown in fig. 16, the lower side compressed line 41 of the lower layer absorbent body 40 overlaps the slit 36 of the upper layer absorbent body 30. Therefore, when body fluid is introduced into the slits 36 of the upper absorbent body 30, the body fluid flows downward through the slits 36 and contacts the lower side compressed lines 41 of the lower absorbent body 40. Then, the body fluid contacting the lower layer absorber 40 spreads in the width direction along the lower side compressed line 41. In particular, in the present embodiment, as described above, the width W of the lower extrusion line 41 exceeds the width S2 of the slit 36. Therefore, the body fluid that has contacted the lower absorbent body 40 through the slits 36 spreads outward in the width direction along the lower compressed line 41 and enters the gap between the upper absorbent body 30 and the lower absorbent body 40. This allows the upper layer absorber 30 to absorb body fluid even on the back side (skin non-facing side). Therefore, the body fluid can be rapidly absorbed, and the absorption amount thereof is increased.

Further, the slits 36 of the upper layer absorbent body 30 do not have the ability to vertically suck up the body fluid from the crotch portion 3 toward the front body 1 or the back body 2 when the wearer takes a standing posture, for example, but the upper side compressed threads 31 or the lower side compressed threads 41 have the ability to vertically suck up the body fluid. Therefore, by connecting the upper side compressed line 31 to the slit 36 of the upper layer absorbent body 30 or by providing the lower side compressed line 41 below the slit 36, the body fluid temporarily accumulated in the slit 36 can be sucked up in the vertical direction and spread widely toward the front body 1 side and the back body 2 side.

Here, in order to understand the technique of the present invention, the principle of absorbing body fluid by the squeeze line will be specifically described. When absorbing body fluid, the absorbent body simultaneously generates both a first diffusion phenomenon in which the body fluid flows through the grooves of the compressed line while expanding, and a second diffusion phenomenon in which the body fluid diffuses along the compressed line due to the fact that the density of the periphery of the compressed line is higher than the density of the body fluid outside the compressed line, thereby generating a capillary phenomenon. The first diffusion phenomenon is dynamic diffusion, and although the in-plane diffusion rate is high, the effect of sucking up the body fluid in the vertical direction cannot be expected. On the other hand, the second diffusion phenomenon, which is caused by the capillary phenomenon around the extrusion line, is expected to diffuse the body fluid by vertically sucking up the body fluid along the extrusion line, although the amount of the diffused fluid is smaller than that of the first diffusion phenomenon. In this way, the compressed line formed in the absorbent body has the ability to suck up the body fluid in the vertical direction. Here, the state of vertically sucking up body fluid corresponds to a state of sucking up urine accumulated in the crotch in a standing posture to the front body and the rear body.

In addition, in the case of a large diaper, the absorbent member has a long entire length and a long distance from the excretion position to the edge. If the urine is partially absorbed only in the urination part, the entire absorbent body cannot be used, and repeated urination occurs, resulting in urine leakage. Therefore, large sheets of diapers are required to use the absorbent body to the edge to absorb a greater amount of urine. However, large sheets of diapers are required to absorb not only a large amount of total urine absorbent but also a high absorption rate. In order to provide a wearer with a comfortable wearing feeling immediately after urination. In addition, generally, a thick absorbent is often produced by overlapping two or more layers of absorbent, and in this case, a technique of providing slits in the upper layer of absorbent is known in order to increase the absorption rate. In addition, a technique is also known in which slits are provided in the lower absorber at the same positions as those of the upper absorber to further improve the diffusibility. However, although such slits have the effect of creating a channel through which body fluid flows or temporarily storing body fluid in the slits, the effect of spreading body fluid at the point of flow is low. In the aspect of the present invention, the slits 36 are formed in the upper layer absorbent body 30 to increase the diffusion rate or the amount of body fluid, and the lower side compressed threads 41 are formed in the lower layer absorbent body 40 to promote the diffusion of body fluid by capillary action, thereby allowing the body fluid to penetrate into a wide range of the absorbent bodies 30 and 40.

As described above, the present invention utilizes the advantages of both the slits 36 of the upper layer absorbent body 30 and the lower side compressed lines 41 of the lower layer absorbent body 40 to improve the diffusion rate, diffusion amount, and diffusion range of the body fluid. Therefore, it is preferable that no slit is formed in the lower layer absorber 40 at least in a range overlapping with the slit 36 of the upper layer absorber 30. If slits are formed in the lower absorbent body 40 at positions overlapping the slits 36 of the upper absorbent body 30, the effect of the lower compressed line 41 of the lower absorbent body 40 in spreading bodily fluids may not be effectively utilized. However, the invention is not intended to exclude the formation of slits in the underlying absorber 40.

As shown in fig. 16, in a state where the upper layer absorbent body 30 and the lower layer absorbent body 40 are overlapped, the upper side compressed line 31 and the lower side compressed line 41 at least partially intersect each other when viewed in a planar direction. The term "in plane" means a direction facing the topsheet 10 or the backsheet 20. By arranging the absorbent bodies 30 and 40 so that the compressed lines 31 and 41 intersect with each other in this manner, body fluid can be efficiently permeated even in a region where the compressed lines are not formed (non-compressed region). That is, the body fluid spread along the compressed line of the absorbent body on one side is easily absorbed by the non-compressed region of the absorbent body on the other side. Therefore, the body fluid spreading along the compressed line of the absorbent body on one side is less likely to reach the end portion, and the leakage to the outside can be effectively prevented. Further, since the body fluid can be absorbed over a wide range in the two-layered absorbers 30 and 40, the amount of body fluid absorbed is increased, and it is difficult to give a wearer a feeling of discomfort even when worn for a long time. Further, by forming the compressed lines 31, 41 in each of the absorbent bodies 30, 40 of the two layers, it is not necessary to form the compressed lines densely in each of the absorbent bodies. Therefore, the skin feeling of each absorber can be prevented from becoming hard.

Here, the thickness of each of the absorbers 30, 40, that is, the thickness of the non-compressed region is, for example, preferably 5mm to 20mm, and particularly preferably 8mm to 15 mm. The thickness of each absorbent body 30, 40 at the portions where the compressed lines 31, 41 are formed is preferably 1mm to 10mm, and particularly preferably 2mm to 5 mm. However, the thickness of the portions where the pressing lines 31, 41 are formed is smaller than the thickness of the non-pressing regions. For example, the thickness of the portion where the extrusion lines 31 and 41 are formed is 3% to 50%, particularly preferably 5% to 20%, of the thickness of the non-extruded region. The width of each extrusion line 31, 41 is preferably 1mm to 5mm, and particularly preferably 2mm to 4 mm.

In the figures of the present application, an example is shown in which the compressed lines 31, 41 are formed by recessing both the absorbent materials 34, 44 and the core wrap sheets 35, 45 constituting the respective absorbers 30, 40. However, the pressing lines 31, 41 may be formed by at least compressing and recessing the absorbent material 34, 44. That is, the core wrap sheets 35, 45 may be joined to wrap the absorbent materials 34, 44 thereof after the absorbent materials 34, 44 are compressed to form the crush lines 31, 41. In this sense, the compressed lines 31, 41 may be formed on the absorbent materials 34, 44 constituting the respective absorbers 30, 40.

[ 2, 2 nd embodiment ]

Next, an absorbent article according to embodiment 2 of the second invention will be described with reference to fig. 17 to 19. In embodiment 2, the same structure as that of embodiment 1 is not described, and a structure different from that of embodiment 1 will be mainly described.

Fig. 17(a) and (b) are top views conceptually showing the upper absorber 30 and the lower absorber 40 separated and laterally aligned. Fig. 17(c) and (d) are cross-sectional shapes of the absorbers 30 and 40 schematically showing the XVII to XVII lines. Fig. 18(a) shows a state where the upper layer absorber 30 and the lower layer absorber 40 are overlapped, and fig. 18(b) shows a cross-sectional shape of the absorber schematically showing a line XVIII to XVIII. Fig. 19 is an enlarged view showing the pattern of the compressed lines 31 formed on the upper layer absorber 30 and the pattern of the compressed lines 41 formed on the lower layer absorber 40. In fig. 17 and 18, only the upper absorber 30 and the lower absorber 40 are conceptually shown in outline. Although not shown in fig. 17 and 18, embodiment 2 described herein may also include at least the top sheet 10 and the back sheet 20, and may further include a pair of three-dimensional creases 50 and a cover sheet 60, as in embodiment 1 described above.

As shown in fig. 17, one of the features of the present invention is a pattern of upper side compressed lines 31 formed on an upper layer absorbent body 30 and a pattern of lower side compressed lines 41 formed on a lower layer absorbent body 40. The compressed lines 31, 41 formed on the respective absorbers 30, 40 form a pattern at least partially intersecting each other when viewed in a planar direction. The pattern of each extrusion line 31, 41 will be described in detail below.

As shown in fig. 17, the upper side compressed lines 31 are formed in a square lattice pattern on the upper layer absorbent body 30. The "square lattice pattern" as used herein means a pattern in which a plurality of extrusion lines extending in parallel with the longitudinal direction intersect a plurality of extrusion lines extending in parallel with the width direction to define square non-extruded regions. In particular, in the present embodiment, the pattern of the upper extrusion line 31 is a regular pattern (square lattice pattern) in which all of the four non-extrusion regions 32 surrounded by the extrusion line 31 are square. In this manner, it is conceivable that a plurality of upper side compressed lines 31, non-compressed regions 32 surrounded by the upper side compressed lines 31 (hereinafter referred to as "upper side non-compressed regions"), and intersection portions 33 where the upper side compressed lines 31 intersect (hereinafter referred to as "upper side intersection portions") are formed in the upper layer absorbent body 30.

On the other hand, the lower side compressed lines 41 are formed in a rhombus lattice pattern on the lower layer absorber 40. The "rhombic lattice pattern" as used herein means a pattern in which a plurality of extrusion lines extending in directions inclined with respect to the longitudinal direction and the width direction intersect to define a rhombic (rhombic) non-extrusion region. In particular, in the present embodiment, the pattern of the lower pressing line 41 forms a regular pattern (a regular rhomboid lattice pattern) in which all of the four non-pressed regions 42 surrounded by the lower pressing line 41 are regular rhomboids (rhomboid squares). In this manner, the lower layer absorbent body 40 may be thought of as being formed with a plurality of lower side compressed lines 41, non-compressed regions 42 surrounded by the lower side compressed lines 41 (hereinafter referred to as "lower side non-compressed regions"), and intersection portions 43 where the lower side compressed lines 41 intersect (hereinafter referred to as "lower side intersection portions").

In the present embodiment, the upper side compressed line 31 is formed by compressing and recessing the upper layer absorbent body 30 from the skin-facing surface side. Similarly, the lower side compressed line 41 is formed by compressing and recessing the lower layer absorber 40 from the skin-facing surface side. Therefore, the lower absorbent body 40 has the lower compressed line 41 formed at a position where the upper absorbent body 30 and the lower absorbent body 40 are overlapped with each other, and a gap is formed therebetween.

Fig. 18 and 19 show a state in which the pattern of the square lattice-shaped upper extrusion lines 31 and the pattern of the square lattice-shaped lower extrusion lines 41 are superimposed. As can be seen from the figures, in the present embodiment, the area of the upper non-pressing region 32 is larger than the area of the lower non-pressing region 42. Therefore, when the upper layer absorbent body 30 and the lower layer absorbent body 40 are superposed, the lower non-compressed regions 42 (square) are accommodated in the upper non-compressed regions 32 (square).

Here, the pattern of the extrusion line of the second invention shown in fig. 17 to 19 and the pattern of the extrusion line of the first invention described with reference to fig. 3 to 5 are common. Therefore, the pattern of the extrusion line of the first invention described above can be applied to the pattern of the extrusion line of the second invention. The pattern of the extrusion lines according to the second aspect of the present invention can be described by referring to the pattern of the extrusion lines according to the first aspect of the present invention, and detailed description thereof will be omitted.

In addition to the above-described configuration, as shown in fig. 17, slits 36 are formed in the upper layer absorber 30. The slit 36 is formed in an elongated, substantially elliptical shape extending in the longitudinal direction about the crotch portion 3 of the absorbent article 100. The slit 36 is a hole shape having both ends closed in the longitudinal direction. The slits 36 are formed in a pattern of square lattice-shaped upper pressing lines 31, and are connected to the plurality of upper pressing lines 31. More specifically, the linear upper side compressed lines 31 extending in the longitudinal direction of the absorbent article are connected to both end portions in the longitudinal direction of the slit 36. Further, linear upper side compressed lines 31 extending in the width direction of the absorbent article are connected to both left and right end portions in the width direction of the slit 36. Therefore, the bodily fluid accumulated inside the slit 36 is diffused in the longitudinal direction and the width direction of the absorbent article along the upper side compressed line 31.

As shown in fig. 18, it is found that the plurality of lower compressed lines 41, the plurality of lower non-compressed regions 42, and the plurality of lower intersection portions 43 of the lower absorbent body 40 overlap the slits 36 of the upper absorbent body 30 in a state where the upper absorbent body 30 and the lower absorbent body 40 are laminated and joined. First, the slit 36 overlaps the lower squeeze line 41, and the body fluid accumulated in the slit 36 is diffused along the lower squeeze line 41. Further, by overlapping the slit 36 and the lower non-compressed region 42, the body fluid accumulated in the slit 36 can be directly absorbed by the lower non-compressed region 42. The lower intersection 43 can be said to function as a hinge of the body fluid diffusion path. Therefore, the slits 36 overlap the lower intersection 43, and the body fluid spreads widely around the lower intersection 43 to the lower absorbent body 40.

In the present embodiment, the lower side compressed line 41 overlapping the slit 36 of the upper layer absorbent body 30 extends in a direction inclined (i.e., an oblique direction) with respect to both the longitudinal direction and the width direction of the absorbent article. Therefore, the body fluid that has contacted the lower squeeze thread 41 through the slit 36 is diffused in an oblique direction along the lower squeeze thread 41.

In the present embodiment, an example is described in which the upper extrusion lines 31 are formed in a square lattice pattern having a relatively large non-extrusion region area, and the lower extrusion lines 41 are formed in a regular rhombic lattice pattern having a relatively small non-extrusion region area. However, the pattern of the pressing line may be exchanged between the upper pressing line 31 and the lower pressing line 41. That is, the square lattice pattern described above may be applied as the pattern of the lower extrusion line 41, and the regular rhombic lattice pattern may be applied as the pattern of the upper extrusion line 31.

[ 3. 3 rd embodiment ]

Next, an absorbent article according to embodiment 3 of the second invention will be described with reference to fig. 20 to 22. Embodiment 3 is not described with respect to the same structure as that of embodiment 1 and embodiment 2, and is described mainly with respect to a structure different from that of embodiment 1 and embodiment 2.

FIGS. 20(a) and (b) show the upper absorber 30 and the lower absorber 40 separately, and FIGS. 20(c) and (d) show the XX-XX cross-sectional shapes. Fig. 21(a) shows a state where the upper layer absorber 30 and the lower layer absorber 40 are overlapped, and fig. 21(b) shows a cross-sectional shape XXI to XXI. Fig. 22 is an enlarged view showing the pattern of the compressed lines 31 formed on the upper layer absorber 30 and the pattern of the compressed lines 41 formed on the lower layer absorber 40. Although not shown in fig. 20 and 21, embodiment 3 described herein may be provided with at least the top sheet 10 and the back sheet 20, and may further be provided with a pair of three-dimensional creases 50 and a cover sheet 60, as in embodiment 1.

Embodiment 3 is different from embodiment 2 in the pattern of the compressed lines 31, 41 formed on the respective absorbers 30, 40. As shown in fig. 20 to 22, the upper compressed lines 31 are formed in a regular rhombic lattice pattern on the upper layer absorbent body 30, and the lower compressed lines 41 are formed in a square lattice pattern on the lower layer absorbent body 40. The regular rhombic lattice pattern referred to here is basically the same as the square lattice pattern described in embodiment 2. However, in embodiment 3, the relative positional relationship between the regular rhombic lattice-shaped pattern formed on the upper layer absorber 30 and the square lattice-shaped pattern formed on the lower layer absorber 40 in the state where the upper layer absorber 30 and the lower layer absorber 40 are overlapped is different from that in embodiment 2.

As shown in fig. 21 and 22, in embodiment 3, the upper intersection 33 of the upper layer absorber 30 and the lower intersection 43 of the lower layer absorber 40 overlap each other in a state where the absorbers 30 and 40 overlap each other. Further, among the plurality of upper side intersection portions 33 of the upper layer absorbent body 30, there is one that overlaps with the center (intersection of diagonal lines) of the lower side non-compressed region 42 of the lower layer absorbent body 40. In particular, in the range where the pattern of the upper side compressed line 31 of the upper layer absorbent body 30 overlaps the pattern of the lower side compressed line 41 of the lower layer absorbent body 40, the upper side intersection 33 is present in all the ranges of the lower side non-compressed region 42 except for the portion where the slit 36 is formed. Therefore, in embodiment 3, it is found that the upper pressing line 31 overlaps with a position corresponding to a diagonal line of the lower non-pressing region 42 formed in a square shape except for the position where the slit 36 is formed. In embodiment 3, it is found that the lower pressing line 41 overlaps the range of the upper non-pressing region 32.

In this way, in embodiment 3, the lower pressing line 41 overlaps the range of the upper non-pressing region 32, the upper pressing line 31 and the upper intersection portion 33 overlap the range of the lower non-pressing region 42, and the upper intersection portion 33 overlaps the lower intersection portion 43. Therefore, the body fluid diffused along the upper side compressed line 31 of the upper layer absorbent body 30 falls onto the lower layer absorbent body 40 and is absorbed by the lower side non-compressed region 42. The body fluid accumulated in the upper intersection 33 of the upper layer absorbent body 30 falls onto the lower layer absorbent body 40, and spreads along the lower side compressed line 41 through the lower intersection 43. Further, the body fluid diffused along the lower side compressed line 41 of the lower layer absorbent body 40 is absorbed by the upper side non-compressed region 32 of the upper layer absorbent body 30. The lower squeeze thread 41 may diffuse the body fluid in a direction diagonal to the lattice pattern of the upper squeeze thread 31. By forming such a pattern, even in the non-compressed regions 32 and 42, which have been conventionally regarded as having a slow absorption time, body fluid can be introduced quickly.

Thus, the pattern of embodiment 3 can be said to have a higher absorption rate of body fluid than the pattern of embodiment 2. In contrast, the pattern of embodiment 2 can be said to have a wider spread range of the body fluid than the pattern of embodiment 3. The pattern of embodiment 2 and the pattern of embodiment 3 may be used in consideration of the performance required for the absorbent article and may be determined as appropriate.

As shown in fig. 21, in a state where the upper layer absorber 30 and the lower layer absorber 40 are laminated and joined, it is found that the plurality of lower side compressed lines 41 and the plurality of lower side non-compressed regions 42 of the lower layer absorber 40 overlap the slits 36 of the upper layer absorber 30. In embodiment 3, the lower side pressing line 41 overlapping the slit 36 extends in the width direction of the absorbent article. Therefore, the body fluid that has contacted the lower squeeze thread 41 through the slit 36 is diffused in an oblique direction along the lower squeeze thread 41.

[ 4 ] the 4 th embodiment ]

Next, an absorbent article according to embodiment 4 of the second invention will be described with reference to fig. 23 and 24. In embodiment 4, the same structure as that of the above-described embodiment will not be described, and a structure different from these embodiments will be mainly described. FIGS. 23(a) and (b) show the upper absorber 30 and the lower absorber 40 separately, and FIGS. 23(c) and (d) show the cross-sectional shapes XXIII to XXIII. Fig. 24(a) shows a state where the upper layer absorber 30 and the lower layer absorber 40 are overlapped, and fig. 24(b) shows cross-sectional shapes XXIV to XXIV.

As shown in fig. 23, in embodiment 4, slits 36 are formed in the upper layer absorbent body 30 along the longitudinal direction, the slits being divided by the upper layer absorbent body 30. In this manner, the slit 36 may be formed from one end to the other end in the longitudinal direction of the upper layer absorbent body 30. In the present embodiment, the compressed lines are not formed on the upper layer absorber 30, but a plurality of compressed lines 41 forming a rhombic lattice pattern are formed only on the lower layer absorber 40. The pattern of the compressed lines 41 formed in the lower absorbent body 40 is the same as the pattern shown in fig. 17 (b).

As shown in fig. 24, in the state where the upper layer absorbent body 30 and the lower layer absorbent body 40 are overlapped, it is found that the plurality of lower side compressed lines 41, the plurality of lower side non-compressed regions 42, and the plurality of lower side intersection portions 43 of the lower layer absorbent body 40 are overlapped with the slits 36 of the upper layer absorbent body 30. The lower side compression line 41 overlapping with the slit 36 extends in a direction inclined to both the longitudinal direction and the width direction of the absorbent article (i.e., an oblique direction). Therefore, the body fluid that has contacted the lower squeeze thread 41 through the slit 36 is diffused in an oblique direction along the lower squeeze thread 41.

[ 4 ] example of sectional shape of absorber ]

In the above-described embodiments 1 to 4, examples of forming the compressed lines 31 and 41 in which the skin-facing surfaces of the upper layer absorbent body 30 and the lower layer absorbent body 40 are recessed have been described. However, the invention is not so limited. Next, another example of the cross-sectional shape of each absorbent body will be described.

Fig. 25 shows an example of the cross-sectional shapes of the upper layer absorber 30 and the lower layer absorber 40. The configuration of the second invention shown in fig. 25 and the configuration of the first invention shown in fig. 11 are common. Therefore, the structure of the first invention described with reference to fig. 11 can be applied to the second invention. The structure shown in fig. 25 will be described with reference to fig. 11, and detailed description thereof will be omitted.

Fig. 26 shows an example of an absorbent article further including an additional absorber 70 (third absorber) in addition to the upper absorber 30 and the lower absorber 40. In the example of fig. 26, the additional absorber 70 is disposed on the side of the lower absorber 40 not facing the skin, that is, between the lower absorber 40 and the backsheet 20 (see fig. 14). The number of additional absorbers 70 positioned below the lower absorber 40 is not limited to 1, and may be 2 or more. The additional absorbent body 70 preferably has a plurality of compressed lines 71, as in the upper absorbent body 30 and the lower absorbent body 40. As shown in fig. 26, the compressed line 71 may be formed by recessing the skin-facing surface side of the additional absorbent body 70, or may be formed by recessing the non-skin-facing surface side of the additional absorbent body 70. The pattern of the compressed line 71 of the additional absorbent body 70 is not particularly limited, and the pattern of the compressed line described in the above embodiment can be appropriately applied.

As described above, in the present specification, in order to express the contents of the present invention, embodiments of the present invention are explained with reference to the drawings. However, the present invention is not limited to the above embodiments, and obviously includes modifications and improvements that are obvious to those skilled in the art based on the matters described in the present specification.

For example, the extrusion lines extending in one of the longitudinal direction and the width direction described in embodiment 1 may be combined with the extrusion lines forming the lattice pattern described in embodiments 2 and 3. That is, of the two absorbent bodies stacked, one absorbent body may have a plurality of non-compressed regions surrounded by compressed lines, and the other absorbent body may have a plurality of compressed lines extending in the longitudinal direction or the width direction. For example, not only the upper layer absorbent body 30 may be formed with compressed lines in a square lattice shape as shown in fig. 17(a), but also the lower layer absorbent body 40 may be formed with a plurality of compressed lines extending in the width direction as shown in fig. 15(b), or vice versa. For example, not only the upper layer absorbent body 30 may have a plurality of compressed lines extending in the longitudinal direction as shown in fig. 15(a), but also the lower layer absorbent body 40 may have compressed lines in a rhombic lattice shape as shown in fig. 17(b), or the opposite may be used.

Industrial applicability of the invention

The present invention relates to an absorbent article such as a diaper or a disposable diaper. In the present specification, the case where the absorbent article of the present invention is a diaper is described as an example, but the present invention is not limited thereto, and the present invention may be applied to a pants-type disposable diaper, a tape-type disposable diaper, or a sanitary napkin. Therefore, the present invention can be suitably used in the manufacturing industry of absorbent articles and the like.

Description of the reference numerals

10 topsheet

20 back sheet

30 Upper absorber (first absorber)

31 upper side extrusion line

31a central extrusion line

31b left extrusion line

31c right extrusion line

31d front side straight line part

31e rear side straight line part

31f crotch line part

31g front inclined part

31h rear inclined part

32 upper non-compressed area

33 upper intersection point part

34 absorbent material

35 core cladding sheet

36 slit

37a straight line part

37b inclined part

40 lower absorber (second absorber)

41 lower side extrusion line

42 lower non-compressed area

43 lower intersection

44 absorbent material

45 core cladding sheet

50 three-dimensional fold

51 side sheet

52 elastically stretchable member

60 cover plate

70 additional absorber (third absorber)

71 extrusion line

100 absorbent article

Claims (12)

1. An absorbent article comprising a liquid-permeable top sheet (10), a back sheet (20), and at least two absorbers (30, 40) laminated and disposed between the top sheet (10) and the back sheet (20),

the two absorption bodies (30, 40) each have a plurality of compressed lines (31, 41) recessed into the absorption body in the thickness direction,

both of the two absorption bodies (30, 40) each have a plurality of non-compressed regions (32, 42) surrounded by the compressed lines (31, 41),

the extrusion lines (31, 41) of the two absorption bodies, viewed in the plane direction, at least partially intersect,

the two absorbers are a first absorber (30) on the topsheet (10) side and a second absorber (40) on the backsheet (20) side,

the compressed lines of the first absorber (30) are formed in a regular rhombic lattice pattern, the compressed lines of the second absorber (40) are formed in a square lattice pattern,

the second absorber (40) has the compressed line (41) recessed at least on the surface on the first absorber (30) side, and a gap is formed between the first absorber (30) and the portion where the compressed line (41) is formed,

at least a part of the compressed line of the absorbent body on one side overlaps with the non-compressed region of the absorbent body on the other side,

the two absorbers (30, 40) each have an intersection (33, 43) where the plurality of compressed lines (31, 41) intersect,

at least a part of the intersection of the first absorbent (30) overlaps the non-compressed region of the second absorbent (40), and

the intersection of the first absorber (30) and the intersection of the second absorber (40) at least partially overlap.

2. An absorbent article comprising a liquid-permeable top sheet (10), a back sheet (20), and at least two absorbers (30, 40) laminated and disposed between the top sheet (10) and the back sheet (20),

the two absorption bodies (30, 40) each have a plurality of compressed lines (31, 41) recessed into the absorption body in the thickness direction,

both of the two absorption bodies (30, 40) each have a plurality of non-compressed regions (32, 42) surrounded by the compressed lines (31, 41),

the extrusion lines (31, 41) of the two absorption bodies, viewed in the plane direction, at least partially intersect,

the two absorbers are a first absorber (30) on the topsheet (10) side and a second absorber (40) on the backsheet (20) side,

the compressed lines of the first absorber (30) are formed in a square lattice pattern, the compressed lines of the second absorber (40) are formed in a regular rhombic lattice pattern,

the second absorber (40) has the compressed line (41) recessed at least on the surface on the first absorber (30) side, and a gap is formed between the first absorber (30) and the portion where the compressed line (41) is formed,

at least a part of the compressed line of the absorbent body on one side overlaps with the non-compressed region of the absorbent body on the other side,

the two absorbers (30, 40) each have intersection portions (33, 43) at which the plurality of compressed lines (31, 41) intersect, the four intersection portions (43) of the non-compressed region (42) of the second absorber overlap the compressed lines (31) on the four sides of the non-compressed region (32) of the first absorber, and the intersection portions (33) of the first absorber overlap the centers of the non-compressed regions (42) of the second absorber, respectively, so that the rows and columns of the non-compressed regions of the second absorber (40) where the intersection portions of the first absorber (30) overlap are arranged in every other row and every other column.

3. An absorbent article comprising a liquid-permeable top sheet (10), a back sheet (20), and at least two absorbers (30, 40) laminated and disposed between the top sheet (10) and the back sheet (20),

the two absorption bodies (30, 40) each have a plurality of compressed lines (31, 41) recessed into the absorption body in the thickness direction,

both of the two absorption bodies (30, 40) each have a plurality of non-compressed regions (32, 42) surrounded by the compressed lines (31, 41),

the extrusion lines (31, 41) of the two absorption bodies, viewed in the plane direction, at least partially intersect,

the two absorbers are a first absorber (30) on the topsheet (10) side and a second absorber (40) on the backsheet (20) side,

the compressed lines of the first absorber (30) are formed in a regular rhombic lattice pattern, the compressed lines of the second absorber (40) are formed in a square lattice pattern,

the compressed line (31) is formed in a concave shape on at least the surface of the first absorber (30) on the side of the second absorber (40), and a gap is formed between the second absorber (40) and the portion where the compressed line (31) is formed,

at least a part of the compressed line of the absorbent body on one side overlaps with the non-compressed region of the absorbent body on the other side,

the two absorbers (30, 40) each have an intersection (33, 43) where the plurality of compressed lines (31, 41) intersect,

at least a part of the intersection of the first absorbent (30) overlaps the non-compressed region of the second absorbent (40), and

the intersection of the first absorber (30) and the intersection of the second absorber (40) at least partially overlap.

4. An absorbent article comprising a liquid-permeable top sheet (10), a back sheet (20), and at least two absorbers (30, 40) laminated and disposed between the top sheet (10) and the back sheet (20),

the two absorption bodies (30, 40) each have a plurality of compressed lines (31, 41) recessed into the absorption body in the thickness direction,

both of the two absorption bodies (30, 40) each have a plurality of non-compressed regions (32, 42) surrounded by the compressed lines (31, 41),

the extrusion lines (31, 41) of the two absorption bodies, viewed in the plane direction, at least partially intersect,

the two absorbers are a first absorber (30) on the topsheet (10) side and a second absorber (40) on the backsheet (20) side,

the compressed lines of the first absorber (30) are formed in a square lattice pattern, the compressed lines of the second absorber (40) are formed in a regular rhombic lattice pattern,

the compressed line (31) is formed in a concave shape on at least the surface of the first absorber (30) on the side of the second absorber (40), and a gap is formed between the second absorber (40) and the portion where the compressed line (31) is formed,

at least a part of the compressed line of the absorbent body on one side overlaps with the non-compressed region of the absorbent body on the other side,

the two absorbers (30, 40) each have intersection portions (33, 43) at which the plurality of compressed lines (31, 41) intersect, the four intersection portions (43) of the non-compressed region (42) of the second absorber overlap the compressed lines (31) on the four sides of the non-compressed region (32) of the first absorber, and the intersection portions (33) of the first absorber overlap the centers of the non-compressed regions (42) of the second absorber, respectively, so that the rows and columns of the non-compressed regions of the second absorber (40) where the intersection portions of the first absorber (30) overlap are arranged in every other row and every other column.

5. The absorbent article according to any one of claims 1 to 4, wherein said two absorbers are a first absorber (30) on the topsheet (10) side and a second absorber (40) on the backsheet (20) side,

further, a third absorber (70) is provided between the top sheet (10) and the first absorber (30) or between the back sheet (20) and the second absorber (40),

the third absorbent body (70) has a plurality of compressed lines (71) recessed into the absorbent body in the thickness direction.

6. An absorbent article comprising a liquid-permeable top sheet (10), a back sheet (20), and at least two absorbers (30, 40) laminated and disposed between the top sheet (10) and the back sheet (20),

the two absorbers are an upper absorber (30) on the top sheet (10) side and a lower absorber (40) on the back sheet (20) side,

the upper layer absorber (30) has one or more slits (36) penetrating in the thickness direction of the absorber, and

a plurality of compressed lines (31) connected to the slit (36) and recessed in the thickness direction of the absorbent body,

the lower layer absorber (40) has a plurality of compressed lines (41) recessed into the absorber in the thickness direction, and

a plurality of non-compressed areas (42) surrounded by the compressed lines (41),

the compressed lines of the upper layer absorber (30) are formed in a regular rhombic lattice pattern, the compressed lines of the lower layer absorber (40) are formed in a square lattice pattern,

at least a part of the compressed line of the absorbent body on one side overlaps with the non-compressed region of the absorbent body on the other side,

the two absorbers (30, 40) each have an intersection (33, 43) where the plurality of compressed lines (31, 41) intersect,

at least a part of the intersection of the upper layer absorbent body (30) overlaps the non-compressed region of the lower layer absorbent body (40), and

the intersection of the upper absorber (30) and the intersection of the lower absorber (40) at least partially overlap.

7. An absorbent article comprising a liquid-permeable top sheet (10), a back sheet (20), and at least two absorbers (30, 40) laminated and disposed between the top sheet (10) and the back sheet (20),

the two absorbers are an upper absorber (30) on the top sheet (10) side and a lower absorber (40) on the back sheet (20) side,

the upper layer absorber (30) has one or more slits (36) penetrating in the thickness direction of the absorber, and

a plurality of compressed lines (31) connected to the slit (36) and recessed in the thickness direction of the absorbent body,

the lower layer absorber (40) has a plurality of compressed lines (41) recessed into the absorber in the thickness direction, and

a plurality of non-compressed areas (42) surrounded by the compressed lines (41),

the compressed lines of the upper layer absorber (30) are formed in a square lattice pattern, the compressed lines of the lower layer absorber (40) are formed in a regular rhombic lattice pattern,

at least a part of the compressed line of the absorbent body on one side overlaps with the non-compressed region of the absorbent body on the other side,

the two absorbers (30, 40) each have intersection portions (33, 43) at which the plurality of compressed lines (31, 41) intersect, the four intersection portions (43) of the non-compressed region (42) of the lower absorber (40) overlap the compressed lines (31) on the four sides of the non-compressed region (32) of the upper absorber (30), and the intersection portions (33) of the upper absorber (30) overlap the centers of the non-compressed regions (42) of the lower absorber (40), respectively, so that the lines and rows of the non-compressed regions of the lower absorber (40) where the intersection portions of the upper absorber (30) overlap are arranged in every other row and every other row.

8. The absorbent article according to claim 6 or 7, wherein the slits (36) of the upper layer absorbent (30) overlap at least a portion of the compression lines (41) of the lower layer absorbent (40).

9. The absorbent article according to claim 8, wherein the slit (36) of the upper layer absorber (30) is one extending in the longitudinal direction of the absorbent article,

the slit (36) overlaps with a compressed line extending in the width direction of the absorbent article or a compressed line extending in a direction inclined with respect to the longitudinal direction, among the compressed lines (41) of the lower layer absorber (40).

10. The absorbent article according to claim 6 or 7, wherein said slits (36) of said upper layer absorbent (30) overlap at least a portion of said non-compressed area (42) of said lower layer absorbent (40).

11. The absorbent article according to claim 6 or 7,

the slit (36) of the upper layer absorber (30) overlaps the intersection (43) of the lower layer absorber (40).

12. The absorbent article according to claim 6 or 7, further comprising one or more supplemental absorbers (70) between the backsheet (20) and the lower absorber (40),

at least one of the plurality of supplemental absorbers (70) has a plurality of compressed lines (71) recessed into the absorber in the thickness direction.

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