RU2683340C1 - Absorbent article - Google Patents

Abstract

FIELD: satisfaction of vital human requirements.SUBSTANCE: top sheet (2) consists of a set that includes the first sheet and the second sheet. Kit includes a plurality of bonded parts formed by partially fastening the first sheet and the second sheet, and has a plurality of protrusions that protrude toward the user's body, wherein the protrusions are formed so that the parts of the first sheet that are different from the bonded parts protrude in the direction from the second sheet. Top sheet (2) includes a central zone (S) and two side zones (M) adjacent to the central zone (S). Shape and / or arrangement of the bonded parts in the central zone (S) differ from the shape and / or the arrangement of the bonded parts in the side zones (M). Area share of the bonded parts is essentially the same in the central zone (S) and the side zones (M). Number of bonded parts per unit area is greater in the side zones (M) than in the central zone (S).EFFECT: suggested absorbent product.29 cl, 6 dwg, 1 tbl

Description

FIELD OF THE INVENTION

[0001]

The present invention relates to various types of absorbent articles, such as disposable diapers and sanitary napkins.

State of the art

[0002]

A technical solution for an absorbent product is known, according to which the side of the skin surface of the upper sheet is formed with a three-dimensional shape to reduce the contact area and friction between the upper sheet and the skin of the user and to improve texture and breathability when wearing the absorbent product. For example, in Patent Literature 1, an upper sheet 2 of an absorbent article 1 is disclosed, which includes a large number of protrusions 21, which have a shape elongated in the longitudinal direction of the absorbent article, in a central zone 2c, which is provided in the center in the longitudinal direction, and a large the number of protrusions 22, which are elongated in the width direction of the absorbent article, in the end zones 2a and 2b, which are provided on the front and rear sides of the central zone 2c. The protrusions 21 and 22 in the central zone 2c and the end zones 2a and 2b are made dispersed in the longitudinal direction and the width direction of the absorbent article 1. The top sheet 2 includes a first nonwoven material 23 on which protrusions 21 and 22 are formed, and a second nonwoven material 24 which is substantially flat and attached to the first nonwoven material 23 in parts other than the protrusions 21 and 22 of the first nonwoven material 23. The patent literature 1 indicates that the absorbent article 1, which includes such a top sheet 2, It has a very good absorbency and a very good leak prevention performance.

[0003]

A patent sheet 2 discloses a top sheet 2 of an absorbent article 1, in which a large number of protrusions 21 are formed, scattered in the longitudinal direction and the width direction of the absorbent article in the center zone 2a, which is provided in the center and extends in the longitudinal direction, and a plurality of rows R1- R3 protrusions are formed in the width direction in the side zones 2b and 2c, which are provided on the right and left sides of the central zone 2a, with each row of protrusions includes a large number of protrusions 22, which are aligned s in the longitudinal direction. The top sheet 2 includes a first nonwoven fabric 22 that is shaped in a defined manner with protrusions and recesses, and a second nonwoven fabric 23 that is substantially flat and attached to the first nonwoven fabric 22 in all or some of the recesses 22a of the first nonwoven fabric 22. Patent Literature 2 indicates that the absorbent article 1, which includes such a top sheet 2, has a very good leakage prevention property and can be effectively prevented as leakage from the sides, t Like leakage from the front and rear ends.

List of links

Patent Literature

[0004]

Patent Literature 1: JP 2009-136349A

Patent Literature 2: JP 2009-148445A

SUMMARY OF THE INVENTION

[0005]

As disclosed in patent literature 1 and 2, to increase the softness of the top sheet, which consists of a set of two nonwoven materials that are attached to each other, or to reduce friction between the top sheet and the skin of the user, it is advisable to establish the proportion of the area of the bonding zones of the two nonwoven materials at a low level. However, a decrease in the proportion of the area of the bonding zones often leads to a decrease in the bond strength between two nonwoven materials. A decrease in bond strength can lead to the separation of nonwoven materials from each other and the formation of a gap between these two nonwoven materials when wearing an absorbent article. In particular, separation and clearance are more likely to occur near the part with leg openings in which there is a high degree of contact with the skin of the user.

Problem Solving Tools

[0006]

The present invention provides an absorbent article including: a top sheet, a back sheet, and an absorbent member that is provided between the top sheet and the back sheet, the top sheet including a kit including a first sheet and a second sheet, the kit includes many bonded parts formed by partially bonding the first sheet and the second sheet, and has a plurality of protrusions that protrude toward the body of the user, the protrusions being formed so that about portions of the first sheet, other than the bonded parts, protrude in the direction from the second sheet, and the top sheet includes a central zone that is located in the center in the width direction of the top sheet and which extends in its longitudinal direction, and two side zones that extend in the longitudinal direction, while the lateral zone adjoins the central zone, while the shape and / or arrangement of the fastened parts in the central zone differs from the shape and / or arrangement of the fastened parts in the lateral zones, while The area of the bonded parts is substantially the same in the central zone and the side zones, and the number of bonded parts per unit area is greater in the side zones than in the central zone.

Brief Description of the Drawings

[0007]

[FIG. 1] FIG. 1 is a plan view of a disposable diaper, which is an embodiment of an absorbent product according to the present invention, in its unfolded state in which the elastic elements are not pulled and aligned when viewed from the side of the top sheet, which forms the diaper surface facing the skin.

[FIG. 2] FIG. 2 is a section in the thickness direction schematically showing a section taken along line II-II of FIG. one.

[FIG. 3] FIG. 3 is a partial plan view of the skin-facing surface of the top sheet of the diaper shown in FIG. one.

[FIG. 4] FIG. 4 is an enlarged plan view of the corresponding part of FIG. 3.

[FIG. 5] FIG. 5 is a schematic view showing an example of a cross-sectional structure of a first fiber or a second fiber that is used in the top sheet of an absorbent article according to the present invention.

[FIG. 6] FIG. 6 (a) and 6 (b) are plan views showing top sheets according to other embodiments that can be used in the absorbent article of the present invention.

Description of Embodiments

[0008]

The present invention relates to an improvement of the top sheet of an absorbent article, which consists of a set of two sheets, and, more particularly, to an absorbent article that includes a top sheet that has a good texture and in which it is unlikely that the two sheets are separated from each other and the formation of a gap between the two sheets is unlikely.

[0009]

Hereinafter, an absorbent article according to the present invention will be described by means of preferred embodiments of the present invention with reference to the drawings. FIG. 1 and 2 show a disposable diaper 1, which is an embodiment of an absorbent article according to the present invention. The diaper 1 includes a front portion 1F that is to be placed on the abdominal side of the wearer when wearing the diaper, a rear portion 1R that is to be placed on the dorsal side of the wearer, and a crotch portion 1M that is provided between the front portion 1F and the rear portion 1R. The diaper 1 has a longitudinal direction X, which extends from the front portion 1F to the rear portion 1R through the crotch portion 1M and corresponds to the direction from the front side to the rear side of the user, and the transverse direction Y, which is perpendicular to the longitudinal direction X. Front portion 1F, crotch portion 1M and the rear part 1R correspond respectively to the zones obtained by dividing the diaper 1 in the longitudinal direction X into three equal parts. The crotch part 1M includes a part that faces the part in which the discharge takes place, and which, when wearing the diaper 1, should be placed opposite the part of the user's body in which the discharge takes place, and the part that faces the part in which the release takes place secretions, usually provided in the center or near the center of the diaper 1 in the longitudinal direction X.

[0010]

As shown in FIG. 1 and 2, the diaper 1 includes an absorbent element 4, which includes an absorbent core 40, liquid permeable, a top sheet 2, which is provided on the side of the skin-facing surface of the absorbent element 4 and can come into contact with the skin of the user when worn a diaper, which is impervious to liquids or water-repellent back sheet 3, which is provided on the side of the surface of the absorbent element not facing the skin 4. In the plan view shown in FIG. 1, the diaper 1 has an elongated hourglass shape in which a part central in the longitudinal direction X in which the crotch part 1M is provided is curved inward and elongated in one direction, in particular in the longitudinal direction X. The top sheet 2 has dimensions, which are essentially equal to the dimensions of the absorbent element 4 or slightly larger than them. The back sheet 3 has dimensions that are larger than the sizes of the absorbent element 4. In addition, the dimensions of the back sheet 3 are larger than the sizes of the top sheet 2. The back sheet 3 projects outward from the peripheral edge of the absorbent element 4 and forms the outer contour of the diaper 1 in its unfolded and unstretched state, shown in FIG. 1. As the back sheet 3, a back sheet of any type that is commonly used in an absorbent article of this type can be used without any limitation, and a polymer film, a laminate of a polymer film and non-woven material or the like can be used. The back sheet 3 may be breathable.

[0011]

As used herein, the term “skin-facing surface” refers to the surface of an absorbent article or its constituent element (eg, absorbent member 4) that is intended to face the wearer's skin when wearing an absorbent article, or, in other words, to a surface that is advantageously close to the skin of the user. The term “non-skin surface” refers to the surface of the absorbent article or its constituent element, which is designed to face the opposite to the skin of the wearer when wearing the absorbent article, or, in other words, to the surface that is used far from the user's skin. As used herein, the phrase “when wearing an absorbent article (or diaper)” refers to a normal and proper position when wearing, or, in other words, to a state in which the absorbent article (or diaper) is correctly positioned when worn, and not covers a condition in which the absorbent article (or diaper) is not in the correct position when worn.

[0012]

Side sheets 5 are provided on the right and left sides in the longitudinal direction X from the side of the upper sheet 2 of the diaper 1. Each side sheet 5 includes an inner edge portion that extends in the longitudinal direction X and an outer edge portion that is located on the outside in in the transverse direction Y, preferably on the inner edge portion, and extends in the longitudinal direction X. In the plan view shown in FIG. 1, the inner edge portion overlaps the absorbent member 4, and as shown in FIG. 2, the outer edge portion extends outward in the transverse direction Y from the side edge of the absorbent member 4, which extends in the longitudinal direction X, and is attached to the back sheet 3. Between the side sheet 5 and the back sheet 3 in each of the parts for the right and left legs, which should be placed around the user's legs, the elastic element 50 in the form of veins is fixed in its stretched state so that it extends in the longitudinal direction X. With this configuration, when wearing the diaper 1, two leg assemblies are formed in og parts of the diaper 1 by pulling together the elastic elements 50. In addition, in the inner edge of each side sheet 5, the elastic element 51 in the form of veins is fixed in its stretched state so that it extends in the longitudinal direction X. When wearing the diaper 1 with this configuration due to the tightening of the elastic elements 51, at least in the crotch part 1M, each of the side sheets 5 forms a cuff that prevents leakage, as a result of lifting the inner edge part up towards the skin of the user la of the bonded portion between the side sheet 5 and the backsheet 3. The cuffs impeding leakage can prevent leakage of the discharged liquid, such as urine, outward in the transverse direction Y, in other words, so-called "lateral leakage". The top sheet 2, the back sheet 3, the absorbent member 4, the side sheets 5 and the elastic members 50 and 51 are attached to each other by known bonding means, such as hot-melt adhesive or the like.

[0013]

The diaper 1 is a disposable diaper of the so-called "open type". As shown in FIG. 1, two fastening tapes 6 and 6 are provided on two lateral edge parts of the rear portion 1R of the diaper 1, which extend in the longitudinal direction X. The fastening part (not shown), which is a male fastening element of the “Velcro” fastener, is attached to each fastening tape 6. In addition, an attachment zone 7 is formed on the non-skin surface of the front portion 1F of the diaper 1, which is a female hook and loop fastener. The attachment zone 7 is formed by attaching and attaching a female velcro fastener to the non-skin surface of the back sheet 3, which forms the non-skin surface of the front portion 1F, using known bonding means, such as, for example, adhesive or heat sealing, and is configured to receive the fastening parts of the fastening tapes 6 with the possibility of disconnection.

[0014]

As seen in the plan view shown in FIG. 1, the absorbent member 4 has a shape that is elongated in the longitudinal direction X, and extends from the front portion 1F to the rear portion 1R. The absorbent element 4 includes: a liquid holding liquid, an absorbent core 40 that contains absorbent material, and a core wrapping sheet 45 that covers the skin-facing surface 40a and the non-skin-facing surface 40b of the absorbent core 40. The absorbent core 40 and the sheet 45 for wrapping, the cores are bonded using a known bonding agent such as hot melt adhesive. The absorbent member 4 (absorbent core 40) is symmetrical of an optionally imaginary line (not shown) that divides the diaper 1 in half in the transverse direction Y and which extends in the longitudinal direction X.

[0015]

The absorbent core 40 may have a single layer structure. Alternatively, the absorbent core 40 may have a multilayer structure. As seen in the plan view shown in FIG. 1, the absorbent core 40 has an hourglass shape in which a part central to the length direction, in other words, to the longitudinal direction X, is curved inward. The absorbent core 40 is formed by stacking fibers from a core forming material that contains absorbent material. Absorbent material, which is commonly used to form an absorbent core of this type, can be used as an absorbent material without particular limitation. For example, wood pulp, hydrophilic fibers, such as synthetic fibers that have been treated with a hydrophilicity improver, and absorbent polymer particles can be used. That is, the absorbent core 40 may be formed from a fibrous set of hydrophilic fibers or from absorbent polymer particles that rely on a set of fibers.

[0016]

As the sheet 45 for wrapping the core can be used permeable sheet material. As the sheet 45 for wrapping the core can be used, for example, paper, non-woven material and the like. In the diaper 1 according to this embodiment, the core wrapping sheet 45 is one continuous core wrapping sheet 45 that has a width that is two times or more and three times or less than the length of the absorbent core 40 in the transverse direction Y. As shown in FIG. 2, one core wrapping sheet 45 covers the entire skin-facing surface 40a of the absorbent core 40 and protrudes outward in the transverse direction Y from the two side edges of the absorbent core 40, which extend in the longitudinal direction X, and the protruding parts are bent down under the absorbent core 40, to cover the entire non-skin surface 40b of the absorbent core 40. It goes without saying that the configuration of the core wrapping sheet 45 is not limited to this. For example, the core wrapping sheet 45 may consist of two separate sheets, namely, a core wrapping sheet located on the skin-facing side that covers the skin-facing surface 40a of the absorbent core 40, and a core-wrapping sheet located on the side not facing the skin, which covers the non-skin facing surface 40b of the absorbent core 40.

[0017]

As shown in FIG. 3, the top sheet 2, located on the side of the skin surface 40a of the absorbent element 4, includes a central zone S and two side zones M and M, which are located on both sides of the central zone S. The central zone S is located in the center in the direction the width (i.e., the transverse direction Y) of the diaper 1 and extends in the longitudinal direction (i.e., the longitudinal direction X) of the diaper 1. The two side zones M and M are adjacent to the central area S and extend in the longitudinal direction (i.e., the longitudinal direction X) of the diaper a 1. The central zone S and the lateral zones M are preferably formed at least in the crotch portion 1M, more preferably formed to extend from the crotch portion 1M to either or both of the front portion 1F and the rear portion 1R, even more preferably formed to extend along the entire length of the absorbent member 4, and even more preferably formed along the entire length of the diaper 1.

[0018]

The central zone S and the lateral zones M may differ from each other in shape and / or arrangement of the fastened parts, which will be described later. The width of the central zone S is preferably 30% or more and more preferably 40% or more of the width of the top sheet 2. In addition, the width of the central zone S is preferably 70% or less and more preferably 60% or less of the width of the top sheet 2. In addition moreover, the width of the central zone S is preferably 30% or more and 70% or less and more preferably 40% or more and 60% or less of the width of the top sheet 2. The width of each side zone M is preferably 15% or more and more preferably 20 % or more about the width of the top sheet 2. In addition, the width of each side zone M is preferably 35% or less and more preferably 30% or less of the width of the top sheet 2. In addition, the width of each side zone M is preferably 15% or more and 35% or less and more preferably 20% or more and 30% or less of the width of the top sheet 2. The total width of the side zones M is preferably 30% or more and more preferably 40% or more of the width of the top sheet 2. In addition, the total width of the side zones M is preferably 70% or mo it and more preferably 60% or less of the width of the top sheet 2. In addition, the total width of the side zones M is preferably 30% or more and 70% or less and more preferably 40% or more and 60% or less of the width of the top sheet 2 .

[0019]

The top sheet 2 consists of a kit including a first sheet and a second sheet. The first sheet is provided on the side of the wearer's body when wearing the diaper 1. The second sheet is provided on the side of the absorbent member 4. As shown in FIG. 4, which is an enlarged view of the corresponding part of FIG. 3, the top sheet 2 includes, in the central zone S and each side zone M, a plurality of bonded portions M11, M12, S11 and S12 formed by partially bonding the kit from the first sheet and the second sheet by embossing or ultrasonic processing, and has a plurality of projections M21 , S21 and S22, which protrude toward the skin of the user, the protrusions being formed so that portions of the first sheet other than the fastened portions M11, M12, S11 and S12 protrude in the direction from the second sheet. The top sheet 2 is also configured so that in the central zone S and each side zone M, its surface on the side of the second sheet is substantially flat and wave-like irregularities with a high height are formed on its surface on the side of the first sheet.

[0020]

Bonded portions included in the central zone S of the top sheet 2 include a central first bonded portion S11 and a central second bonded portion S12. The central first bonded portion S11 and the central second bonded portion S12 have rectangular shapes with sides extending in the longitudinal direction X and sides extending in the transverse direction Y, and the shape of the central first bonded portion S11 is different from the shape of the central second bonded portion S12. The central first bonded parts S11 are arranged to form the first rows S31 of bonded parts in which the central first bonded parts S11 are arranged with a predetermined distance between them in the longitudinal direction X. The central second bonded parts S12 are also located so as to form a second row S32 of bonded parts and a third row S33 of bonded parts, in which the central second bonded parts S12 are arranged with a predetermined distance between them in the longitudinal direction X. The second row S32 of bonded parts and s number S33 bonded portions disposed alternately between the first series S31 bonded portions adjacent to each other. The step in the longitudinal direction X of the central second fastened parts S12 included in the second row S32 of fastened parts is the same as that determined in the longitudinal direction X in the step of the central second fastened parts S12 included in the third row S33 of fastened parts. The central second bonded parts S12 included in the second row S32 of bonded parts are offset half a step from the central second bonded parts S12 included in the third row S33 of bonded parts. As a result of the central first bonded parts S11 and the central second bonded parts S12 being arranged as described above, the protrusions included in the central zone S include a central first protrusion S21 and a central second protrusion S22. The central first protrusion S21 has an essentially elliptical shape in a plan view in which the length in the transverse direction Y is greater than the length in the longitudinal direction X. The central second protrusion S22 has an essentially circular shape in a plan view in which the length in the transverse direction Y is essentially the same as the length in the longitudinal direction X. If you look at the top sheet 2 in the longitudinal direction X, the first row of protrusions S34, in which the central first protrusions S21 and the central second protrusions S22 are alternately in the longitudinal direction X, about azovan the center region S. The first series S34 protrusions located in the same place as the second series of bonded pieces S32, described above. Furthermore, when looking at the top sheet 2 in the longitudinal direction X, the second row of protrusions S35, in which only the central second protrusions S22 are located in the longitudinal direction X, is formed in the central zone S. The second row of protrusions S35 is located in the same place as the third row S33 of bonded parts described above. The term “substantially elliptical shape / elliptical shape” is a concept that encompasses a fully elliptical shape and an elongated circular shape. The expression "essentially a circle shape in which the length in the transverse direction Y is essentially the same as the length in the longitudinal direction X" covers both the ideal circle shape and the shape of an ellipse in which the length in the longitudinal direction X is within ± 10% from the length in the transverse direction Y.

[0021]

Bonded portions included in each side zone M of top sheet 2 include a lateral first bonded portion M11 and a lateral second bonded portion M12. The lateral first bonded portion M11 and the lateral second bonded portion M12 have rectangular shapes with sides extending in the longitudinal direction X and sides extending in the transverse direction Y, and the shape of the lateral first bonded portion M11 is different from the shape of the lateral second bonded portion M12. The lateral first fastened parts M11 are arranged so as to form a fourth row M31 of fastened parts, in which the lateral first fastened parts M11 are located with a predetermined distance between them in the longitudinal direction X. The lateral second fastened parts M12 are also located so as to form the fifth rows M32 of fastened parts in which the lateral second fastened parts M12 are located with a predetermined distance between them in the longitudinal direction X. The fourth row M31 of fastened parts and the fifth row M32 of fastened parts are located alternately in the transverse direction Y. Step first side bonded portions M11 included in the fourth row M31 bonded parts, the same as the second step of the side bonded portions M12 included in the fifth row M32 bonded parts. The lateral first bonded parts M11 included in the fourth row M31 of bonded parts are offset half a step from the lateral second bonded parts M12 included in the fifth row M32 of bonded parts. As a result, the protrusions included in the side zones M include protrusions of only one type, namely the side protrusions M21. Each lateral protrusion M21 is formed within a zone surrounded by four fastened parts: two lateral first fastened parts M11, adjacent in the longitudinal direction X, and two lateral second fastened parts M12, adjacent in the transverse direction Y. The lateral protrusions M21 are shown in plan view along essentially the shape of a circle in which the length in the transverse direction Y is essentially the same as the length in the longitudinal direction X. If you look at the top sheet 2 in the transverse direction Y, the third row of protrusions M33 and the fourth row of protrusions M34, in each of which the lateral protrusions M21 are located in the transverse direction Y, are formed in the lateral zone M. The pitch of the lateral protrusions M21 included in the third row of protrusions M33 is the same as the pitch of the lateral protrusions M21 included in the fourth row of M34 protrusions. The lateral protrusions M21 included in the third row of M33 protrusions are offset half a step from the lateral protrusions M21 included in the fourth row of M34 protrusions.

[0022]

In the central zone S, the height of the central first protrusions S21 may be the same as or different from the height of the central second protrusions S22. For reasons related to improving appearance and tactile sensations, it is preferable that the height of the central first protrusions S21 be different from the height of the central second protrusions S22. In the case where the protrusions S21 and S22 have different heights, the height of the central first protrusions S21 may be greater than the height of the central second protrusions S22. Alternatively, the height of the central second protrusions S22 may be greater than the height of the central first protrusions S21. When performing protrusions of two types with such a configuration that they have different heights, parts that create different tactile sensations are provided alternately, while these parts provide a better texture when touched with your finger compared to the case when one type of protrusions having the same height. In addition, with this configuration, leakage can be reduced, since when the released urine flows along the surface of the top sheet 2, the resistance to movement of urine increases from low protrusions to high protrusions, which makes it difficult for urine to flow out. As for the side protrusions M21 formed in the side zones M, each side protrusion M21 may have the same height as the height of the central first protrusions S21 and the central second protrusions S22, or may have a height different from the height of the central first protrusions S21 and the central second protrusions S22. For example, the height of the side protrusions M21 may be the same as the height of any of the central first protrusions S21 and the central second protrusions S22, may be the same as the heights of the central first protrusions S21 and the central second protrusions S22, or may differ from the height of the central first protrusions S21 and the central second protrusions S22. In each side zone M, there is a possibility of separation of the upper sheet 2 due to movements of the user's leg. For this reason, for reasons related to suppressing the separation of the top sheet 2, the side protrusions M21 made in each side zone M preferably consist of protrusions of the same type. In addition, the height of the side protrusions M21 in the side zones M is preferably less than the heights of the central first protrusions S21 and the central second protrusions S22 or the same as the heights of the central first protrusions S21 and the central second protrusions S22 in the central zone S, which is required to have a better texture.

[0023]

In the top sheet 2, the shape and / or arrangement of the fastened parts S11 and S12 in the central zone S differs from the shape and / or arrangement of the fastened parts M11 and M12 in the side zones M. In particular, at least either the shape or the scheme the locations of the fastened parts S11, S12, M11 and M12 are different in the central zone S and each side zone M. More specifically, the central zone S and each side zone M are formed so that they have one of the following configurations: (i) the layout of the fastened parts the same, but the fastened parts are different forms; (ii) the bonded parts have the same shape, but the layout of the bonded parts is different, and (iii) the layout of the bonded parts is different, and the bonded parts are different. When performing the central zone S and each side zone M with different configurations, as described above, the contact between the top sheet 2 and the skin of the user can be adjusted accordingly, and the appearance can be significantly changed, while it is preferable that the shape and arrangement of the fastened parts were different. In the embodiment shown in FIG. 3 and 4, in the central zone S and the lateral zones M, the arrangement of the bonded parts S11, S12, M11 and M12 is different, and the shape of the bonded parts S11, S12, M11 and M12 is also different.

[0024]

In the top sheet 2, in addition to the fact that the shape and / or arrangement of the bonded parts are different in the central zone S and each side zone M, the proportion of the area of the bonded parts is essentially the same in the central zone S and each side zone M. The proportion (%) of the area of the bonded parts in each of the central zone S and the lateral zones M refers to the value obtained by dividing the total area of the fastened parts, which are made in a given area, by a given area and then multiplying by 100. The expression "the area ratio of the fastened parts is essentially the same ”covers both the case in which the area ratio of the fastened parts is the same in the central zone S and each lateral zone M, and the case in which the area ratio in the lateral zone is within ± 15% of the area fraction in the central zone S. there is, if the area ratio in the lateral zone M is 0.85A% or more and 1.15A% or less, while the area ratio in the central zone S is A%, it can be argued that the area ratio is essentially the same in the central zone S and each side zone M.

[0025]

The implementation of the Central zone S and the side zones M with such a configuration that they have essentially the same proportion of the area of the fastened parts provides the advantage that it will be unlikely that the first sheet and the second sheet, which form the top sheet 2, are separated from each other when wearing the diaper 1. This also provides another advantage, namely, that there is a slight change in pressure during rotation of the roller for manufacturing the top sheet 2 by attaching the first sheet and second about the sheet to each other by means of an adhesive, and substantially the same linear pressure can be provided in the direction of the width of the roller in the central zone S and the side zones M, which leads to a significant improvement in manufacturability. For example, the formation of holes during the process of attaching the first sheet and the second sheet to each other by means of adhesive is unlikely. It is also possible to reduce the wear and cracking of the roller, which is used to adhere the first sheet and the second sheet to each other by adhesive.

[0026]

In addition, by means of a configuration in which the area ratio of the fastened parts is substantially the same in the central zone S and each side zone M, it is possible to provide an advantage that is important for the absorbent article and that the released urine can be uniformly absorbed over the entire surface absorbent element. In this embodiment, a plurality of bonded portions M11, M12, S11 and S12 are formed by partially bonding the kit from the first sheet and the second sheet by embossing or ultrasonic processing. In the bonded parts of the fiber, the nonwoven materials that form the first sheet and the second sheet turn into a film to prevent separation and formation of a gap during use, and therefore, urine is not absorbed by the bonded parts. In normal use, urine is discharged into the central zone S at a rate of 3 cm ³ / s or more and 20 cm ³ / s or less. Accordingly, not all urine can be absorbed by the central zone S. Therefore, it is important that the urine is immediately absorbed not only by the central zone S, but also by the lateral zones M. the parts that are present in the lateral zones M will be different, there is unevenness in the rate of absorption of the released urine in these zones, which makes it difficult to uniformly and efficiently use the entire surface of the absorbent element and makes it likely Ram leakage. Since, in the present invention, the area ratio of the bonded parts is the same in these areas, this disadvantage can be prevented. In addition, the entire surface of the absorbent element is used uniformly and efficiently, and therefore, the amount of free moisture in the diaper (moisture that is not retained by the absorbent polymer particles) is reduced, and it is possible to suppress the return of moisture to the skin when the diaper is worn.

[0027]

Provided that the area ratio of the bonded parts is substantially the same in the central zone S and each side zone M, the area ratio of the bonded parts in the central zone S and each side zone M is preferably 10% or more, and more preferably 15% or more. In addition, the area ratio of the bonded parts is preferably 40% or less and more preferably 35% or less. The area ratio of the bonded parts is preferably 10% or more and 40% or less, and more preferably 15% or more and 35% or less. When setting the area fraction within the above limits, the bonding strength of two sheets can be increased sufficiently without deterioration of the texture and absorbency of the top sheet 2.

[0028]

In the top sheet 2, in addition to the shape and / or arrangement of the bonded parts differ in the central zone S and each lateral zone M, the number of bonded parts per unit area is greater in each lateral zone M than in the central zone S. By configuration, which the number of fastened parts per unit area is greater in each lateral zone M than in the central zone S, the following advantages (a) and (b) can be obtained.

(a) The degree of freedom of the constituent fibers of the topsheet 2 or, in other words, the mobility of the fibers will be higher in the central zone S than in the lateral zone M. As a result, the softness of the central zone S is increased.

(b) The height difference of the protrusions and recesses in the lateral zone M is relatively small, and the degree of freedom of the fibers is reduced. As a result, there will be a low probability of a rupture of the upper sheet 2 in the side zones caused by the movement of the user's legs. In addition, setting the number of fastened parts in each side zone M so that it is larger than in the central zone S also provides the advantage that the vibration of both side parts of the roller during manufacture is reduced, thereby improving processability. For example, the formation of holes during the process of attaching the first sheet and the second sheet to each other by means of adhesive is unlikely. It is also possible to reduce the wear and cracking of the roller, which is used to adhere the first sheet and the second sheet to each other by adhesive.

[0029]

The top sheet 2 preferably has a ratio of C> D, wherein C represents the area of the fastened parts S11 and S12, which has the largest area among the fastened parts formed in the central zone S, and D represents the area of the fastened parts M11 and M12, which has the largest the area among the fastened parts formed in the lateral zone M. With a configuration in which the area of the fastened parts formed in the central zone S is larger than the area of the fastened parts formed in the lateral zones M, the number of fastened parts, o Browns in the central zone S can easily be made smaller than the number of fastened parts formed in the lateral zones M. Accordingly, the occurrence of irregular folds in the central zone S when wearing the diaper is unlikely. The occurrence of irregular folds facilitates the movement of urine and excrement along the folds, which may cause leakage. To solve this problem, it is necessary to suppress the occurrence of wrinkles, as a result of which fluid leakage can be eliminated.

[0030]

For reasons associated with further suppressing the occurrence of wrinkles, it is preferable that the area D is 80% or less and more preferably 70% or less of the area C. In addition, the area D is preferably 20% or more and more preferably 30% or more of area C. Area D is preferably 20% or more and 80% or less and more preferably 30% or more and 70% or less of area C.

[0031]

The proportion of the total area of the bonded parts with area C with respect to the total area of the bonded parts in the central zone S is preferably 20% or more, and more preferably 30% or more. The upper limit of this fraction is preferably 80% and more preferably 70%. On the other hand, the proportion of the total area of the bonded parts with area D with respect to the total area of the bonded parts in each side zone M is preferably 80% or more, and more preferably 90% or more. The upper limit of this fraction is preferably 100%.

[0032]

The top sheet 2 preferably has a ratio E> F, wherein E is the length of the fastened parts S11 and S12 determined in the longitudinal direction X, which has the longest length among the fastened parts formed in the central zone S, and F is the length determined in the longitudinal direction the fastened parts M11 and M12, which has the longest length among the fastened parts formed in each lateral zone M. With this configuration, folds are likely to occur in an ordered manner in the central zone S when wearing the diaper 1, the cause of the folds being the fact that the central zone S receives the force acting in the transverse direction inward from the hips of the user. In other words, the occurrence of irregular folds in the central zone S is unlikely, as a result of which fluid leakage is suppressed.

[0033]

For reasons related to providing wrinkles in a more orderly manner, it is preferable that the length F is 80% or less and more preferably 70% or less of the length E. In addition, the length F is preferably 20% or more and more preferably 30% or more than length E. The length F is preferably 20% or more and 80% or less and more preferably 30% or more and 70% or less of length E.

[0034]

The proportion of the total area of the bonded parts with a length E relative to the total area of the bonded parts in the central zone S is preferably 20% or more, and more preferably 30% or more. The upper limit of this fraction is preferably 100% and more preferably 80%. On the other hand, the proportion of the total area of the bonded parts with a length F with respect to the total area of the bonded parts in each side zone M is preferably 60% or more, and more preferably 80% or more. The upper limit of this fraction is preferably 100% and more preferably 90%.

[0035]

Preferably, in the top sheet 2, each side zone M of the top sheet 2 has a higher shear stress than the central zone S of the top sheet 2. The shear stress is an indication of the softness of the protrusions formed in the central zone S and each side zone M. Than the smaller the shear stress, the softer the protrusions. Accordingly, the fact that the shear stress is higher in each lateral zone M than in the central zone S indicates that the protrusions in the central zone S are softer than the protrusions in the side zones. With this configuration, the protrusions in the central zone S, which is the most prevailing soft zone, can be made softer, and thereby a conveniently fitting diaper 1 can be obtained.

[0036]

Shear stress can be measured using the following method.

The test sample is obtained by cutting from the top sheet, which serves as the target of measurements, with a rectangular shape in plan view with a length of 50 mm in the longitudinal direction and a length of 30 mm in the transverse direction. Further, the adhesive tape (product name: No. 500, supplied by Nitto Denko Corporation), which has the same shape and dimensions as the test sample, is placed on a polyethylene terephthalate (PET) film (product name: Star OHP Film, supplied by Star Corporation ) to obtain kit (A). Then, the protrusion-free side of the test specimen is placed on the kit (A) on the side of the adhesive tape to receive the kit (B). The roller, which has a weight of 1 kg, is moved back and forth five times in the kit (B) for fastening the adhesive tape and the test piece included in the kit (B) by crimping. The male element (product name: 1600PPI, supplied by 3M Company) of a “Velcro” mechanical fastener, which has a shape and size sufficient to close the entire test specimen, is prepared as an attachment piece, and the attachment piece is attached by crimping to the protruding side the test sample included in set (B) by means of hook-shaped elements on the attached piece under a load of 1.5 kPa to obtain a sample for measurements. The resulting measurement sample was placed between the clamps (with a clamp distance of 150 mm) of the tensile testing machine (Autograph AG-X, supplied by Shimadzu Corporation), and the measurement sample was delaminated at 180 degrees. The delamination at 180 degrees is carried out by means of the fact that the set (B) at one end of the measurement specimen, determined in the longitudinal direction, and an attached piece at the other end, which are respectively held by the clamps of the tensile testing machine, are pulled apart from each other in the directions opposite 180 degrees. The pulling speed is set equal to 300 mm / min, and record the maximum tensile load at this time. As measurement points for each diaper that serves as a test sample, only six places are selected (front side and rear side in the longitudinal direction of the diaper, and the left side, the right side and the center in the transverse direction of the diaper). The measurement is performed on a total of three diapers, and the average value from the measurement results is defined as the shear stress (unit: N) of the top sheet, which is the target of the measurement.

[0037]

The shear stress of the central zone S assumes a value of preferably 25 N or more and more preferably 30 N or more. In addition, the shear stress of the central zone S assumes a value of preferably 34 N or less, and more preferably 33 N or less. The shear stress of the central zone S assumes a value of preferably 25 N or more and 34 N or less and more preferably 30 N or more and 33 N or less. On the other hand, the shear stress of each side zone M assumes a value of preferably 33 N or more and more preferably 35 N or more, provided that the shear stress of each side zone M exceeds the shear stress of the central zone S. In addition, the stress upon a shift of each side zone, M takes on a value preferably of 45 N or less, and more preferably 40 N or less. The shear stress of each side zone M assumes a value of preferably 33 N or more and 45 N or less and more preferably 35 N or more and 40 N or less.

[0038]

To execute the central zone S and each lateral zone M with such a configuration that they have different shear stresses, it is possible to change, for example, the configuration of the fastened parts in the central zone S and each lateral zone M, or the bond strength of the fastened parts in the central zone can be changed S and each side zone M. For example, it is assumed that the protrusions S21 and S22 are in the central zone S and the protrusions M21 are in each side zone M (see FIG. 4). It is important that the ratio S _max > M _{max is} fulfilled, in which S _max represents the area of the protrusion (protrusions S21 in Fig. 4), which has the largest area among the protrusions in the central zone S, and M _max represents the area of the protrusion (protrusions M21), which has the largest area among the protrusions in the lateral zone M. When this ratio is fulfilled, the degree of freedom (mobility) of the fibers in the central zone S becomes relatively higher than the degree of freedom (mobility) of the fibers in the lateral zones M, and the softness increases more significantly enno.

[0039]

The top sheet 2 having the above configuration can be made, for example, in accordance with the method of manufacturing a composite sheet disclosed in JP 2015-112343A. More specifically, a strip-like first sheet is fed between the first roller and the second roller, the peripheral surfaces of which are profiled to allow them to engage with each other, the first sheet is deformed so that it has protrusions and recesses, then the first sheet is moved along the peripheral surface of the first roller from of the engaged part, and then the second sheet is fed so that the second sheet is placed on the first sheet. Two sheets are pressed under heating between the protrusions on the first roller and the heating roller to partially bond the sheets. Moreover, the shape of the protrusions and recesses of the first roller and the second roller and the configuration of the fastened parts formed by the first roller and the heating roller will be different in the central part and side parts of the first sheet. During the deformation of the first sheet so that it has protrusions and recesses, by feeding the first sheet into the part in which the first roller and the second roller are engaged with each other, it is preferable that the first sheet is attracted towards the inner side of the rollers to facilitate deformation of the first sheet so that it has protrusions and indentations.

[0040]

The first sheet and the second sheet, which form the top sheet 2, are formed from sheet materials. As the sheet materials, for example, fibrous sheets such as non-woven materials, woven materials and knitted materials, films and the like can be used. For reasons related to texture and the like, it is preferable to use fibrous sheets. In particular, it is preferable to use nonwoven materials. The sheet material that forms the first sheet and the sheet material that forms the second sheet may be materials of the same type or may be materials of different types. However, for reasons related to providing high bond strength, it is preferable that the sheet material that forms the first sheet and the sheet material that forms the second sheet are sheet materials of the same type.

[0041]

In the case where a nonwoven fabric is used as a sheet material for each of the first sheet and the second sheet, examples of the nonwoven fabric include a nonwoven fabric bonded by passing air through, a nonwoven fabric of a spunbond production method, a nonwoven fabric obtained by hydro-entangling, a nonwoven fabric obtained by an aerodynamic method from melt, nonwoven fabric bonded with resin, and nonwoven fabric obtained by needle-punched. You can also use a kit obtained by combining two or more of the nonwoven materials listed above, or a kit obtained by combining a nonwoven material similar to those listed above with a film and the like. Among the nonwoven materials listed above, it is preferable to use a nonwoven material bonded by passing air through or a nonwoven material of a spunbond production method. In particular, the first sheet, which is a sheet to be placed on the side that faces the skin of the wearer when wearing the diaper 1, is preferably formed of a non-woven material held together by passing air through.

[0042]

Non-woven materials that are used as sheet materials for the first sheet and the second sheet independently have a surface density of preferably 10 g / m ² or more and more preferably 15 g / m ² or more and preferably 40 g / m ² or less and more preferably 35 g / m ² or less. Non-woven materials have a surface density of 10 g / m ² or more and 40 g / m ² or less and more preferably 15 g / m ² or more and 35 g / m ² or less.

[0043]

As fibers that form such a non-woven material, fibers obtained from any type of thermoplastic resin can be used. Examples of the thermoplastic resin include polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, polyamides such as nylon 6 and nylon 66, polyacrylic acid, polymethacrylic acid alkyl ester, polyvinyl chloride and polyvinylidene chloride. These resins can be used individually or as a mixture containing a combination of two or more of them. In addition, these resins can be used in the form of multicomponent fibers, such as multicomponent fibers with a core in the shell or multicomponent fibers with the arrangement of components side by side.

[0044]

In particular, the first sheet, which is a sheet to be placed on the side that faces the skin of the user when wearing the diaper 1, preferably contains many types of fibers. In particular, when the first sheet has a two-layer structure consisting of an upper layer and a lower layer, it is preferred that any of the upper layer and the lower layer contain many types of fibers. This configuration provides a feeling of a high degree of springing created by the protrusions and an improvement in the smoothness of the protrusions. In addition, the ability of the protrusions to move to a standing position and the resistance of the protrusions to flattening upon application of load are improved.

[0045]

Many types of fibers preferably include at least two types of fibers for the first fiber and the second fiber. The first fiber and the second fiber preferably comprise a high melting point component and a low melting point component that has a lower melting point than the high melting point component. In this case, the component of the first fiber having a high melting point and the component of the second fiber having a high melting point can be components of the same type or can be components of different types. Furthermore, the low-melting component of the first fiber and the low-melting component of the second fiber can be of the same type or can be of different types. The first fiber and the second fiber are preferably different from each other by changing the ratio of diameters. As used herein, the term “diameter ratio” refers to the ratio of the diameter (μm) of the high melting point component to the diameter of the low melting point component in each of the first fiber and the second fiber. As for the diameter of the component with a high melting point and the diameter of the component with a low melting point, for example, in the case when the first and second fibers are multicomponent fibers with a core in the shell and the resin of their shell consists of a component with a low melting point and their resin the core consists of a component with a high melting point, diameter D1 shown in FIG. 5, means the diameter of component C1 with a low melting point and diameter D2 means the diameter of component C2 with a high melting point. In this case, the ratio of the AH diameters between the component C2 with a high melting point and the component C1 with a low melting point in the Xth fiber can be calculated according to the equation below. The term “fusible fibers of the same type”, as used herein, refers to fibers that are formed from the same resin and have the same structure. For example, if there are two multicomponent fibers with a core in the sheath, consisting of a component with a high melting point and a component with a low melting point, and a component with a high melting point and a component with a low melting point in these two multicomponent fibers are formed from the same resins, and the fibers have the same ratio of core and shell diameters, it can be argued that these two multicomponent fibers are heat-fusible fibers of the same type. On the other hand, even if a component with a high melting point and a component with a low melting point are formed from the same resins, in the case of a different ratio of diameters, these two multicomponent fibers are heat-fusible fibers of different types. In addition, the expression "contain many types of fibers" means "contain hot-melt fibers of different types."

The ratio of the AH of the diameters in the Xth fiber = diameter D1 (μm) of the component of the Xth fiber having a low melting point ÷ diameter D2 (μm) of the component of the Xth fiber having a high melting point

[0046]

In the present invention, as described above, it is preferable that the ratio of A1 diameters in the first fiber and the ratio of A2 diameters in the second fiber are different. The value of A2 / A1, which is the ratio of A2 to A1, is preferably less than 1, more preferably 0.99 or less, and even more preferably 0.91 or less. In addition, the value of A2 / A1 is preferably 0.5 or more, more preferably 0.6 or more, and even more preferably 0.7 or more. When setting the relationship between A1 and A2 as described above, the feeling of spring created by the protrusions is further enhanced, and the smoothness of the protrusions is further enhanced. In addition, the ability of the protrusions to move to a standing position and the resistance of the protrusions to collapse when applying a load are further improved. For example, the value of A2 / A1 is preferably 0.5 or more and less than 1, more preferably 0.6 or more and 0.99 or less, and even more preferably 0.7 or more and 0.91 or less.

[0047]

The relationship between the ratio of A1 diameters in the first fiber and the ratio of A2 diameters in the second fiber is as described above. The ratio of A1 diameters in the first fiber takes on a value of preferably 1.1 or more, more preferably 1.2 or more, and even more preferably 1.3 or more. In addition, the ratio of A1 diameters in the first fiber assumes a value of preferably 2.0 or less, more preferably 1.9 or less, and even more preferably 1.8 or less. More specifically, the ratio of A1 diameters in the first fiber takes on a value preferably of 1.1 or more and 2.0 or less, more preferably 1.2 or more and 1.9 or less, and even more preferably 1.3 or more and 1 8 or less.

[0048]

On the other hand, the ratio of A2 diameters in the second fiber takes on a value preferably of 1.1 or more, more preferably 1.2 or more, and even more preferably 1.3 or more, provided that the value of the ratio of A2 diameters in the second fiber is less than ratios of A1 diameters. In addition, the ratio of A2 diameters in the second fiber assumes a value of preferably 2.0 or less, more preferably 1.9 or less, and even more preferably 1.8 or less. More specifically, the ratio of A2 diameters in the second fiber takes on a value preferably of 1.1 or more and 2.0 or less, more preferably 1.2 or more and 1.9 or less, and even more preferably 1.3 or more and 1 8 or less.

[0049]

FIG. 6 (a) and 6 (b) show top sheets 2 according to other embodiments. In the top sheet 2 according to the embodiment shown in FIG. 6 (a), bonded portions included in the central zone S include central first bonded portions S11 and central second bonded portions S12, which have shapes that are different from each other. The central first bonded parts S11 are arranged so as to form the first rows S31 of bonded parts in which the central first bonded parts S11 are arranged with a predetermined distance between them in the longitudinal direction X. Similarly, the central second bonded parts S12 are also located so as to form second rows S32 fastened parts, in which the Central second fastened parts S12 are located with a predetermined distance between them in the longitudinal direction X. Two first rows of S31 fastened parts and one second S32 number bonded portions are combined as a group and this group is positioned with its repetition in the transverse direction Y.

[0050]

On the other hand, bonded portions included in each side zone M include bonded portions of only one type, namely the lateral first bonded portions M11. The lateral first fastened parts M11 are arranged so as to form the fourth rows M31 of fastened parts, in which the lateral first fastened parts M11 are located with a predetermined distance between them in the longitudinal direction X. In addition, the lateral first fastened parts M11 are located so as to form the fifth rows M32 fastened parts, in which the lateral first fastened parts M11 are located with a predetermined distance between them in the longitudinal direction X. The pitch of the fastened parts 11 included in the longitudinal direction X in the fourth rows of M31 fastened parts, differs from the step determined in the longitudinal direction X of the fastened parts 11 included in the fifth row M32 of fastened parts. The step of the fastened parts 11 included in the fifth row M32 of the fastened parts is greater than the step of the fastened parts 11 included in the fourth rows of the M31 fastened parts.

[0051]

In the top sheet 2 according to the embodiment shown in FIG. 6 (b), the bonded portions included in the central zone S include the central first bonded portions S11 and the central second bonded portions S12, which have different shapes from each other. The central first bonded parts S11 are arranged to form the first rows S31 of bonded parts in which the central first bonded parts S11 are arranged with a predetermined distance between them in the longitudinal direction X. In addition, the central first bonded parts S11 are arranged so as to form the second rows S32 fastened parts in which the central first fastened parts S11 are arranged with a predetermined distance between them in the longitudinal direction X. The pitch of the central first c replennyh parts S11 included in the first series of bonded pieces S31, the same as defined in the longitudinal direction of the central first step S11 bonded portions included in the second series of bonded pieces S32. The central first bonded parts S11 included in the first row S31 of bonded parts are offset half a step from the central first bonded parts S11 included in the second row S32 of bonded parts. On the other hand, the central second fastened parts S12 are arranged to form third rows S33 of fastened parts, in which the central second fastened parts S12 are located with a predetermined distance between them in the longitudinal direction X. In the central zone S, there is one first row S31 of fastened parts, one a third row S33 of fastened parts, one first row S31 of fastened parts, one third row S33 of fastened parts, one second row S32 of fastened parts and one third row S33 of fastened parts are arranged in this order in the transverse direction board and Y are combined as a group and this group is positioned with its repetition in the transverse direction Y.

[0052]

On the other hand, bonded parts included in the side zone M include bonded parts of only one type, namely the lateral first bonded parts M11. The lateral first fastened parts M11 are arranged so as to form the fourth rows M31 of fastened parts, in which the lateral first fastened parts M11 are located with a predetermined distance between them in the longitudinal direction X. In addition, the lateral first fastened parts M11 are located so as to form the fifth rows M32 fastened parts, in which the lateral first fastened parts M11 are arranged with a predetermined distance between them in the longitudinal direction X, whereby the fifth rows M32 of fastened parts are formed. The longitudinally determined pitch of the fastened parts 11 included in the fourth rows M31 of fastened parts is the same as the longitudinally determined pitch of the fastened parts 11 included in the fifth rows M32 of fastened parts. Bonded parts 11 included in the fourth rows of M31 bonded parts are offset half a step from bonded parts 11 included in the fifth rows M32 of bonded parts.

[0053]

In the case of the topsheets 2 according to the embodiments shown in FIG. 6 (a) and 6 (b) and described above, it is also preferred that the area ratio of the bonded parts is substantially the same in the central zone S and each side zone M, and it is preferred that the number of bonded parts per unit area is larger in each side zone M than in the central zone S. With the configuration described above, the upper sheets 2 have a good texture, and it is unlikely that the two sheets are separated from each other and a gap occurs between the two sheets.

[0054]

To this point, the present invention has been described by means of preferred embodiments of the present invention. However, the present invention is not limited to the above embodiments. For example, in the above embodiments, an example has been described in which the absorbent article of the present invention is used as a disposable type diaper. However, the present invention is also applicable to other disposable diapers, for example, such as a pull-on disposable diaper. In addition, the present invention is also applicable to absorbent articles other than disposable diapers, for example, such as a sanitary pad and an urological pad for adults.

[0055]

For the embodiment described above, further absorbent articles are further disclosed below by means of the present invention.

<1> An absorbent article comprising: a top sheet, a back sheet and an absorbent member that is provided between the top sheet and the back sheet,

wherein the top sheet comprises a kit including a first sheet and a second sheet,

the kit includes a plurality of fastened parts formed by partially bonding the first sheet and the second sheet, and has a plurality of protrusions that protrude toward the user's body, the protrusions being formed so that portions of the first sheet other than the fastened parts protrude in the direction from the second sheet, and

top sheet includes

a Central zone, which is located in the center in the direction of the width of the upper sheet and which extends in its longitudinal direction, and

two side zones that extend in the longitudinal direction, while the side zone adjoins the central zone,

the shape and / or arrangement of the fastened parts in the central zone is different from the shape and / or arrangement of the fastened parts in the side zones,

the area ratio of the fastened parts is substantially the same in the central zone and the side zones, and

the number of fastened parts per unit area is greater in the lateral zones than in the central zone.

<2> Absorbent article according to <1>,

in which the top sheet has a ratio of C> D,

wherein C is the area of the fastened part that has the largest area among the fastened parts formed in the central zone, and D is the area of the fastened part that has the largest area among the fastened parts formed in the side zones.

<3> Absorbent article according to <1> or <2>,

in which the top sheet has a ratio of E> F,

wherein E is the longitudinally determined length of the fastened part that has the longest length among the fastened parts formed in the central zone, and F is the longitudinally determined length of the fastened part that has the longest length among the fastened parts formed in the side zones .

<4> Absorbent product according to any one of paragraphs <1> - <3>,

in which the top sheet is configured such that each of the side zones of the top sheet has a higher shear stress than the center region of the top sheet.

<5> An absorbent article according to any one of paragraphs <1> to <4>, comprising:

the front part, which is to be placed on the abdominal side of the user when wearing an absorbent product;

the back, which is to be placed on the dorsal side of the user; and

the crotch portion that is provided between the front and the back,

wherein the central zone and the lateral zones are formed at least in the crotch portion.

<6> An absorbent article according to any one of paragraphs <1> to <5>, comprising:

the front part, which is to be placed on the abdominal side of the user when wearing an absorbent product;

the back, which is to be placed on the dorsal side of the user; and

the crotch portion that is provided between the front and the back,

wherein the central zone and the side zones are preferably formed so that they extend from the crotch portion to any one or both of the front and rear parts, more preferably formed so that they extend along the entire length of the absorbent element, even more preferably formed along the entire length absorbent product.

<7> Absorbent product according to any one of paragraphs <1> - <6>,

in which the width of the Central zone is preferably 30% or more, more preferably 40% or more of the width of the top sheet and preferably 70% or less, more preferably 70% or less of the width of the top sheet.

<8> Absorbent product according to any one of paragraphs <1> - <7>,

in which the width of each of the side zones is preferably 15% or more and 35% or less and more preferably 20% or more and 30% or less of the width of the top sheet.

<9> Absorbent product according to any one of paragraphs <1> - <8>,

in which the total width of the side zones is preferably 30% or more, more preferably 40% or more of the width of the top sheet and 70% or less, more preferably 60% or less of the width of the top sheet.

<10> Absorbent product according to any one of paragraphs <1> - <9>,

wherein the top sheet is configured such that in the central zone and in each of the side zones, the surface on the side of the second sheet is substantially flat and wave-like irregularities with a high height are formed on the surface on the side of the first sheet.

<11> An absorbent article according to any one of <1> to <10>, wherein the article has: a longitudinal direction that corresponds to a direction from a front side to a rear side of a user, and a transverse direction that is perpendicular to a longitudinal direction,

wherein the bonded portions included in the central zone of the top sheet include a central first bonded portion and a central second bonded portion,

the central first bonded portion and the central second bonded portion are rectangular in shape with sides extending in the longitudinal direction and sides extending in the transverse direction, and the shape of the central first bonded portion is different from the shape of the central second bonded portion.

<12> An absorbent article according to any one of <1> to <11>, wherein the article has: a longitudinal direction that corresponds to a direction from the front side to the rear side of the user, and a transverse direction that is perpendicular to the longitudinal direction,

wherein the bonded parts included in the central zone of the top sheet include central first bonded parts and central second bonded parts,

the central first fastened parts are arranged so as to form the first rows of fastened parts in which the central first fastened parts are arranged with a predetermined distance between them in the longitudinal direction,

the central second fastened parts are arranged so as to form second rows of fastened parts and third rows of fastened parts, in which the Central second fastened parts are located with a predetermined distance between them in the longitudinal direction,

a second row of fastened parts and a third row of fastened parts are alternately arranged between the first rows of fastened parts adjacent to each other, and

a longitudinally determined step of the central second fastened parts included in the second row of fastened parts is the same as a longitudinally determined step of the central second fastened parts included in the third row of fastened parts, and

the central second fastened parts included in the second row of fastened parts are offset half a step from the central second fastened parts included in the third row of fastened parts.

<13> An absorbent article according to any one of <1> to <12>, wherein the article has: a longitudinal direction that corresponds to a direction from the front side to the rear side of the user, and a transverse direction that is perpendicular to the longitudinal direction,

wherein the protrusions included in the central zone include a central first protrusion and a central second protrusion,

the central first protrusion is essentially an ellipse in a plan view in which the length in the transverse direction is greater than the length in the longitudinal direction,

the central second protrusion has a substantially circular shape in a plan view in which the length in the transverse direction is substantially the same as the length in the longitudinal direction.

<14> An absorbent article according to any one of <1> to <13>, wherein the article has: a longitudinal direction that corresponds to a direction from the front side to the rear side of the user, and a transverse direction that is perpendicular to the longitudinal direction,

wherein the bonded portions included in the side zones include a lateral first bonded portion and a lateral second bonded portion,

the lateral first bonded portion and the lateral second bonded portion have rectangular shapes with sides extending in the longitudinal direction and sides extending in the transverse direction, and the shape of the lateral first bonded portion is different from the shape of the lateral second bonded portion.

<15> An absorbent article according to any one of <1> to <14>, wherein the article has: a longitudinal direction that corresponds to a direction from a front side to a rear side of a user, and a transverse direction that is perpendicular to a longitudinal direction,

wherein the bonded parts included in the side zones include lateral first bonded parts and lateral second bonded parts,

the lateral first bonded parts are arranged so as to form fourth rows of bonded parts, in which the lateral first bonded parts are arranged with a predetermined distance between them in the longitudinal direction,

the lateral second fastened parts are arranged so as to form fifth rows of fastened parts, in which the lateral second fastened parts are arranged with a predetermined distance between them in the longitudinal direction,

the fourth row of fastened parts and the fifth row of fastened parts are alternately in the transverse direction,

the step of the side first fastened parts included in the fourth row of fastened parts is the same as the step of the side second second fastened parts included in the fifth row of fastened parts, and

the lateral first bonded parts included in the fourth row of bonded parts are offset half a step from the lateral second bonded parts included in the fifth row of bonded parts.

<16> Absorbent product according to any one of paragraphs <1> - <15>,

in which the protrusions included in the Central zone include a Central first protrusion and a Central second protrusion,

the height of the central first protrusion is different from the height of the central second protrusion.

<17> Absorbent product according to any one of paragraphs <1> - <16>,

in which the height of the protrusions included in the Central zone is greater than the height of the protrusions included in the side zones, or

the height of the protrusions included in the central zone is the same as the height of the protrusions included in the side zones.

<18> Absorbent product according to any one of paragraphs <1> - <17>,

in which the arrangement of the fastened parts in the central zone is different from the arrangement of the fastened parts in the side zones, and

the shape of the bonded parts in the central zone also differs from the shape of the bonded parts in the side zones.

<19> Absorbent product according to any one of paragraphs <1> - <18>,

in which the area ratio of the bonded parts in the central zone and the area ratio of the bonded parts in the side zones are preferably 10% or more, more preferably 15% or more, and preferably 40% or less, more preferably 35% or less.

<20> Absorbent product according to any one of paragraphs <1> - <19>,

in which the area D is preferably 80% or less, more preferably 70% or less of area C and preferably 20% or more, more preferably 30% or more of area C,

wherein area C is the area of the fastened part that has the largest area among the fastened parts formed in the central zone, and area D is the area of the fastened part that has the largest area among the fastened parts formed in the side zones.

<21> Absorbent product according to any one of paragraphs <1> - <20>,

in which the proportion of the total area of the bonded parts with area C with respect to the total area of the bonded parts in the central zone is preferably 20% or more, more preferably 30% or more and preferably 80% or less, more preferably 70% or less,

wherein area C is the area of the fastened part that has the largest area among the fastened parts formed in the central zone, and D is the area of the fastened part that has the largest area among the fastened parts formed in the side zones.

<22> Absorbent product according to any one of paragraphs <1> - <21>,

in which the proportion of the total area of the bonded parts with an area D with respect to the total area of the bonded parts in the side zones is preferably 80% or more, more preferably 90% or more, and the upper limit of this fraction is preferably 100%,

wherein C is the area of the fastened part that has the largest area among the fastened parts formed in the central zone, and area D is the area of the fastened part that has the largest area among the fastened parts formed in the side zones.

<23> An absorbent article according to any one of <1> to <22>, wherein the article has: a longitudinal direction that corresponds to a direction from the front side to the rear side of the user, and a transverse direction that is perpendicular to the longitudinal direction,

wherein the length F is preferably 80% or less, more preferably 70% or less of the length E and preferably 20% or more, more preferably 30% or more of the length E,

wherein E is the longitudinally determined length of the fastened part that has the longest length among the fastened parts formed in the central zone, and F is the longitudinally determined length of the fastened part that has the longest length among the fastened parts formed in the side zones .

<24> Absorbent product according to any one of paragraphs <1> - <23>,

in which the proportion of the total area of the bonded parts with a length E with respect to the total area of the bonded parts in the central zone is preferably 20% or more, more preferably 30% or more, and the upper limit of this fraction is preferably 100%,

wherein the length E is the longitudinally determined length of the fastened part that has the longest length among the fastened parts formed in the central zone, and F is the longitudinally determined length of the fastened part that has the longest length among the fastened parts formed in the side areas.

<25> Absorbent product according to any one of paragraphs <1> - <24>,

in which the proportion of the total area of the bonded parts with a length F with respect to the total area of the bonded parts in the side zones is preferably 60% or more, more preferably 80% or more, and the upper limit of this fraction is preferably 100%,

wherein E is the longitudinally determined length of the fastened part that has the longest length among the fastened parts formed in the central zone, and the length F is the longitudinally determined length of the fastened part that has the longest length among the fastened parts formed in the side areas.

<26> Absorbent product according to any one of paragraphs <1> - <25>,

in which the shear stress of the Central zone takes a value of preferably 25 N or more, more preferably 30 N or more, and preferably 34 N or less, more preferably 33 N or less.

<27> Absorbent product according to any one of paragraphs <1> - <26>,

in which the shear stress of each of the side zones takes on a value of preferably 33 N or more, more preferably 35 N or more and preferably 45 N or less, more preferably 40 N or less, provided that the shear stress of each of the side zones is greater than the stress when shifting the central zone.

<28> Absorbent product according to any one of paragraphs <1> - <27>,

in which the relation S _max > M _max ,

wherein S _max represents the area of the protrusion that has the largest area among the protrusions in the central zone, and M _max represents the area of the protrusion that has the largest area among the protrusions in the side zones.

<29> Absorbent product according to any one of paragraphs <1> - <28>,

in which non-woven materials that are used as sheet materials for forming the first sheet and the second sheet have a surface density of preferably 10 g / m ² or more, more preferably 15 g / m ² or more and preferably 40 g / m ² or less, more preferably 35 g / m ² or less.

[0056]

Hereinafter, the present invention will be described in further detail by way of examples. However, the scope of the present invention is not limited to the examples below. Unless otherwise specified,% means% of the mass.

[0057]

Example 1

A disposable diaper was obtained by removing the top sheet of a Merries® disposable diaper (manufactured by Kao Corporation in 2015) and then placing a sheet similar to that shown in FIG. 3 and 4, instead of the removed top sheet. The top sheet shown in FIG. 3 and 4, had fastened parts with the following dimensions: S11: 1 mm × 4 mm, S12: 1 mm × 1 mm, M11: 1 mm × 4 mm and M12: 1 mm × 3 mm (they all had a rectangular shape).

As the first sheet forming the top sheet, or, in other words, the sheet to be placed on the surface facing the skin of the user, a non-woven material bonded by passing air through (surface density: 18 g / m ² ) was used. As a second sheet, a non-woven material was used, held together by passing air through (surface density: 18 g / m ² ). The non-woven material bonded through passing air through and forming the first sheet had a two-layer structure consisting of an upper layer and a lower layer, and the upper layer was formed of multicomponent fibers with a core in the sheath (resin mass ratio: 5/5, 2.3 dtex and ratio of core and shell diameters: 1.57) made of polyethylene terephthalate and polyethylene. The lower layer was formed from a cotton blend consisting of multicomponent fibers with a core in a shell (resin mass ratio: 5/5, 2.3 dtex and a ratio of core and shell diameters: 1.57) of polyethylene and polyethylene terephthalate and multicomponent fibers with a core in the shell (resin mass ratio: 5/5, 2.2 dtex and the ratio of core and shell diameters: 1.42) made of polypropylene and polypropylene with a low melting point with a mass ratio: 5: 5. Non-woven material, bonded through air through and forming a second sheet, was formed from multicomponent fibers with a core in the sheath (resin mass ratio: 5/5 and 2.3 dtex) from polyethylene terephthalate and polyethylene.

[0058]

Example 2

A disposable diaper was obtained in the same manner as in Example 1, except that a top sheet similar to that shown in FIG. 6 (a) was used as the top sheet in Example 1. The top sheet shown in FIG. 6 (a), had fastened parts with the following dimensions: S11: 1 mm × 2 mm, S12: 1 mm × 1 mm, and M11: 1 mm × 1 mm (they all had a rectangular shape).

[0059]

Example 3

A disposable diaper was obtained in the same manner as in Example 1, except that a top sheet similar to that shown in FIG. 6 (b) was used as the top sheet in Example 1. The top sheet shown in FIG. 6 (b), had fastened parts with the following dimensions: S11: 1 mm × 3 mm, S12: 1 mm × 1 mm, and M11: 1 mm × 1 mm (they all had a rectangular shape).

[0060]

Comparative Example 1

A disposable diaper was obtained in the same manner as in Example 1, except that the top sheet, in which only the fastened portions of the side zones of the top sheet used in Example 1, were formed over its entire area, was used as the top sheet in Example one.

[0061]

Rating

The disposable diapers obtained in the examples and the comparative example were evaluated using the methods below with respect to the texture of the top sheet and the degree of separation of the sheets included in the top sheet. The results are shown in Table 1 below.

[0062]

Top sheet softness

Ten mothers with babies who used diapers attended.

Each diaper was evaluated using the criteria below regarding the softness of the surface material. The results obtained are shown in Table 1.

First, they touched the top sheet of a Merries® disposable diaper (manufactured by Kao Corporation in 2015), and the texture was set as a reference value (3 rating points). After that, an assessment was made on the basis of five levels: 1 point (soft), 2 points (slightly soft), 3 points (as soft as Merries), 4 points (not as soft), 5 points (non-soft), and softness evaluated using an average of ten participants.

[0063]

The degree of separation of sheets in the top sheet

The acrylic plate was placed on the sample, a load was applied to it so that the pressure reached a value of 3.5 kPa, which is the pressure that is supposed to be applied when the baby is sitting on the diaper, and then the acrylic plate was moved a predetermined number of times with a length 10 cm stroke, and the degree of separation was visually checked and evaluated. The degree of separation of the top sheet of a Merries® disposable diaper (manufactured by Kao Corporation in 2015) was defined as “medium,” the degree of separation lower than average was rated as “low,” and the degree of separation higher than average , was rated as "high."

[0064]

[Table 1]

Example 1 Example 2 Example 3 Comparative example The proportion of the area of the fastened parts (%) Central zone 32 eighteen 21 thirty Side zone thirty 17 eighteen thirty The number of fastened parts (per cm ² ) Central zone 8 10 10 fifteen Side zone fifteen 17 eighteen fifteen The maximum area of the fastened parts (cm ² ) Central zone four 2 3 one Side zone four one one one Minimum length of fastened parts in the longitudinal direction (mm) Central zone four 2 3 one Side zone four one one one Shear stress (N) Central zone 32 thirty 26 35 Side zone 38 35 37 32 Top sheet texture (points) Central zone 1.8 1.9 1.7 3.2 Side zone 3,1 2,8 2.7 3,1 The degree of separation of sheets in the top sheet Central zone Average Average Medium to high Average Side zone Average Average Average Average

[0065]

As is clear from the results shown in Table 1, the upper diaper sheets of the examples had a better texture than the upper diaper sheet of the comparative example. In addition, it is unlikely that sheets are separated from each other.

Industrial applicability

[0066]

According to the present invention, there is provided an absorbent article that has a good texture and in which it is unlikely that two sheets will separate from each other and a gap between the two sheets is unlikely.

Claims (64)

1. An absorbent article comprising: a top sheet, a back sheet and an absorbent member that is sandwiched between the top sheet and the back sheet, wherein the top sheet comprises a kit including a first sheet and a second sheet, wherein the kit includes a plurality of fastened parts formed by partially bonding the first sheet and the second sheet, and has a plurality of protrusions that protrude toward the user's body, the protrusions being formed so that portions of the first sheet other than the fastened parts protrude in the direction from the second sheet, and top sheet includes a Central zone, which is located in the center in the direction of the width of the upper sheet and which extends in its longitudinal direction, and two side zones that extend in the longitudinal direction, the side zone adjoining the central zone, the shape and / or arrangement of the fastened parts in the central zone is different from the shape and / or arrangement of the fastened parts in the side zones, the area ratio of the fastened parts is substantially the same in the central zone and the side zones, and the number of fastened parts per unit area is greater in the lateral zones than in the central zone. 2. The absorbent article of claim 1, wherein the top sheet has a ratio of C> D, wherein C is the area of the fastened part that has the largest area among the fastened parts formed in the central zone, and D is the area of the fastened part, which has the largest area among the fastened parts formed in the side zones. 3. The absorbent product according to claim 1, in which the top sheet has a ratio of E> F, wherein E is the longitudinally determined length of the bonded part, which has the longest length among the bonded parts formed in the central zone, and F is determined in the longitudinal direction, the length of the bonded part, which has the largest length among the bonded parts formed in the side zones. 4. The absorbent article of claim 1, wherein the top sheet is configured such that each of the side zones of the top sheet has a higher shear stress than the center region of the top sheet. 5. Absorbent product according to claim 1, containing: the front part, which is to be placed on the abdominal side of the user when wearing an absorbent product; the back, which is to be placed on the dorsal side of the user; and the crotch portion that is provided between the front and the back, wherein the central zone and the lateral zones are formed in the crotch portion. 6. Absorbent product according to claim 1, containing: the front part, which is to be placed on the abdominal side of the user when wearing an absorbent product; the back, which is to be placed on the dorsal side of the user; and the crotch portion that is provided between the front and the back, wherein the central zone and the lateral zones are formed so that they extend from the crotch portion to any one or both of the front portion and the rear portion. 7. Absorbent product according to claim 1, in which the width of the Central zone is from 30% to 70% of the width of the top sheet. 8. An absorbent product according to claim 1, in which the width of each of the side zones is from 15% to 35% of the width of the top sheet. 9. Absorbent product according to claim 1, in which the total width of the side zones is from 30% to 70% of the width of the top sheet. 10. The absorbent product according to claim 1, wherein the top sheet is configured such that in the central zone and in each of the side zones, the surface on the side of the second sheet is substantially flat and wave-like irregularities with a high height are formed on the surface on the side of the first sheet . 11. The absorbent product according to claim 1, which has: a longitudinal direction corresponding to the direction from the front side to the rear side of the user, and a transverse direction that is perpendicular to the longitudinal direction, wherein the bonded portions included in the central region of the top sheet include a central first bonded portion and a central second bonded portion, the central first bonded portion and the central second bonded portion have rectangular shapes with sides extending in the longitudinal direction and sides extending in the direction width, and the shape of the central first bonded portion is different from the shape of the central second bonded portion. 12. The absorbent product according to claim 1, which has: a longitudinal direction corresponding to the direction from the front side to the rear side of the user, and a transverse direction that is perpendicular to the longitudinal direction, wherein the bonded portions included in the central zone of the top sheet include the central first bonded portions and the central second bonded portions, the central first bonded portions being arranged so as to form first rows of bonded portions in which the central first bonded portions are arranged with a predetermined distance between them in the longitudinal direction, and the central second fastened parts are arranged so as to form second rows of fastened parts and third rows of fastened parts in which the central second fastened parts are arranged with a predetermined distance between them in the longitudinal direction, while a second row of fastened parts and a third row of fastened parts are alternately arranged between the first rows of fastened parts adjacent to each other, and a longitudinally determined step of the central second fastened parts included in the second row of fastened parts is the same as a longitudinally determined step of the central second fastened parts included in the third row of fastened parts, and the central second fastened parts included in the second row of fastened parts are offset half a step from the central second fastened parts included in the third row of fastened parts. 13. The absorbent product according to claim 1, which has: a longitudinal direction corresponding to the direction from the front side to the rear side of the user, and a transverse direction that is perpendicular to the longitudinal direction, wherein the protrusions included in the central zone include a central first protrusion and a central second protrusion, the central first protrusion being essentially an ellipse in a plan view in which the length in the width direction is greater than the length in the longitudinal direction, and the central second protrusion has essentially the shape of a circle in a plan view in which the length in the width direction is substantially the same as the length in the longitudinal direction. 14. The absorbent product according to claim 1, which has: a longitudinal direction corresponding to the direction from the front side to the rear side of the user, and a transverse direction that is perpendicular to the longitudinal direction, while the fastened parts included in the side zones include a side first fastened part and a lateral second bonded portion, the lateral first bonded portion and the lateral second bonded portion are rectangular in shape with sides extending in the longitudinal direction and sides extending in equal width, and the shape of the side first bonded part is different from the shape of the side second bonded part. 15. The absorbent product according to claim 1, which has: a longitudinal direction corresponding to the direction from the front side to the rear side of the user, and a transverse direction that is perpendicular to the longitudinal direction, wherein the fastened parts included in the side zones include side first fastened parts and side second fastened parts, the side first fastened parts being arranged so as to form fourth rows of fastened parts in which the side first fastened parts are arranged with a predetermined distance between them in the longitudinal direction, and the lateral second fastened parts are arranged so as to form fifth rows of fastened parts in which the lateral second fastened parts are arranged with a predetermined distance between among them in the longitudinal direction, the fourth row of fastened parts and the fifth row of fastened parts are alternately arranged in the width direction, the step of the side first fastened parts included in the fourth row of fastened parts is the same as the step of the side second second fastened parts included in the fifth row of fastened parts, and the lateral first bonded parts included in the fourth row of bonded parts are offset half a step from the lateral second bonded parts included in the fifth row of bonded parts. 16. The absorbent article of claim 1, wherein the protrusions included in the central zone include a central first protrusion and a central second protrusion and the height of the central first protrusion is different from the height of the central second protrusion. 17. The absorbent product of claim 1, wherein the height of the protrusions included in the central zone is greater than the height of the protrusions included in the side zones, or the height of the protrusions included in the central zone is the same as the height of the protrusions included in the side zones. 18. The absorbent article of claim 1, wherein the arrangement of the bonded parts in the central zone is different from the layout of the bonded parts in the side zones and the shape of the bonded parts in the central zone is also different from the shape of the bonded parts in the side zones. 19. An absorbent product according to claim 1, in which the proportion of the area of the fastened parts in the central zone and the proportion of the area of the fastened parts in the side zones are from 10% to 40%. 20. The absorbent product according to claim 1, in which the area D is from 20% to 80% of area C, wherein area C is the area of the fastened part that has the largest area among the fastened parts formed in the side zones, and area D is the area of the fastened part that has the largest area among the fastened parts formed in the central zone. 21. Absorbent product according to claim 1, in which the proportion of the total area of the bonded parts with area C with respect to the total area of the bonded parts in the central zone is 20% or more and 80% or less, wherein area C is the area of the fastened part that has the largest area among the fastened parts formed in the side zones, and D is the area of the fastened part that has the largest area among the fastened parts formed in the central zone. 22. The absorbent product according to claim 1, in which the proportion of the total area of the bonded parts with an area D with respect to the total area of the bonded parts in the side zones is preferably from 80% to 100%, wherein C is the area of the fastened part that has the largest area among the fastened parts formed in the side zones, and area D is the area of the fastened part that has the largest area among the fastened parts formed in the central zone. 23. The absorbent product according to claim 1, which has: a longitudinal direction corresponding to the direction from the front side to the rear side of the user, and a transverse direction that is perpendicular to the longitudinal direction, wherein the length F is from 20% to 80% of the length E, and the length E is the longitudinally determined length of the fastened part that has the longest length among the fastened parts formed in the central zone, and the length F is the longitudinally determined length of the fastened part that has the longest length among the fastened parts formed in the side zones . 24. The absorbent product according to claim 1, in which the proportion of the total area of the fastened parts with a length E relative to the total area of the fastened parts in the central zone is from 20% to 100%, wherein the length E is the longitudinally determined length of the fastened part that has the longest length among the fastened parts formed in the central zone, and F is the longitudinally determined length of the fastened part that has the longest length among the fastened parts formed in the side areas. 25. An absorbent product according to claim 1, in which the proportion of the total area of the fastened parts with a length F relative to the total area of the fastened parts in the side zones is from 60% to 100%, wherein E is the longitudinally determined length of the fastened part that has the longest length among the fastened parts formed in the central zone, and the length F is the longitudinally determined length of the fastened part that has the longest length among the fastened parts formed in the side areas. 26. The absorbent product according to claim 1, in which the voltage when shifting the Central zone takes a value of from 25 N to 34 N. 27. The absorbent product according to claim 1, in which the shear stress of each of the side zones takes on a value of 33 N to 45 N, provided that the shear stress of each of the side zones is greater than the shear stress of the central zone. 28. The absorbent product according to claim 1, in which the ratio S _max > M _max , wherein S _max represents the area of the protrusion that has the largest area among the protrusions in the central zone, and M _max represents the area of the protrusion that has the largest area among the protrusions in the side zones. 29. The absorbent article of claim 1, wherein the nonwoven materials that are used as sheet materials to form the first sheet and the second sheet independently have a surface density of 10 g / m ² to 40 g / m ² .

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