JP6178828B2 - Absorbent articles - Google Patents

Description

  The present invention relates to absorbent articles such as disposable diapers, sanitary napkins, and incontinence pads.

  Conventionally, as a surface sheet of an absorbent article such as a disposable diaper, a sanitary napkin, an incontinence pad, etc., an uneven surface formed by embossing or the like is known on the skin side face directed to the skin side of the wearer. In addition, by forming an uneven shape on the skin side of the topsheet, it is also known to reduce the contact area with the skin of the wearer to improve air permeability and reduce stickiness to the skin. Yes.

  From the viewpoint of improving the air permeability and reducing the stickiness of the skin, it is preferable that the concavo-convex shape of the surface sheet has a high shape retaining property. However, generally, when trying to improve the shape retention, the texture (feel) is deteriorated, or the drawability of the liquid from the surface of the surface sheet to the absorber side is lowered.

  Patent Documents 1 and 2 describe providing a plurality of concavo-convex regions with different shapes and heights of convex portions on a top sheet of a disposable diaper.

JP 2009-136349 A JP 2012-214938 A

  However, Patent Document 1 discloses a technique for preventing leakage by controlling the horizontal diffusion direction of the liquid by using a convex portion, and mentions a configuration for improving both air permeability and liquid drawing-in. Absent. Patent Document 2 also does not disclose a configuration that improves both air permeability and liquid draw-in.

  The subject of this invention is providing the absorbent article which can eliminate the fault which the prior art mentioned above has.

  The present invention is an absorbent article comprising a top sheet, a back sheet, and an absorbent body disposed between the two sheets, wherein the composite sheet has a first direction and an article width along the longitudinal direction of the article. The first sheet and the second sheet that are stacked are partially joined to form a plurality of joints, and the first sheet is a second sheet at a portion other than the joints. Projecting toward the wearer's skin side, and forming the convex portion projecting toward the wearer's skin, the composite sheet has a central region in which the convex portions are formed in different patterns, and both sides of the central region A central first convex portion which is a convex portion having the maximum height in the central region is a first side convex portion which is a convex portion having the maximum height in the side region. Compared to the part High, compressive deformation amount of the central region is greater than the amount of compressive deformation of the side area, there is provided an absorbent article.

  The absorbent article of the present invention is excellent in both air permeability and liquid draw-in.

FIG. 1 is a plan view showing a basic configuration of a disposable diaper as an embodiment of the absorbent article of the present invention. 2 is a cross-sectional view taken along line II-II in FIG. FIG. 3 is a plan view showing the top sheet of the disposable diaper of the first embodiment. FIG. 4 is an enlarged perspective view showing a part of the central region of the composite sheet used in the first embodiment. FIG. 5 is an enlarged perspective view showing a part of the side region of the composite sheet used in the first embodiment. FIG. 6 is an explanatory view of the function and effect of the present invention. FIG. 6A is a schematic cross-sectional view in the width direction of a non-pressurized surface sheet (composite sheet), and FIG. It is a width direction schematic cross section of the surface sheet (composite sheet) in a state. FIG. 7 is a schematic diagram showing a state where the fiber density near the base of the central first convex portion is increased by pressurization. FIG. 8 is an enlarged plan view showing a part of the central region of the composite sheet used in the first embodiment. 9A is a sectional view taken along the line Va-Va in FIG. 8, FIG. 9B is a sectional view taken along the line Vb-Vb in FIG. 8, and FIG. 9C is a sectional view taken along the line Vc-Vc in FIG. is there. FIG. 10 is an enlarged plan view showing a part of the side region of the composite sheet used in the first embodiment. 11 is a cross-sectional view taken along line Vd-Vd in FIG. FIG. 12 is a schematic plan view showing a preferred arrangement of the central continuous convex portion and the elastic member in the elastic member arrangement region formed on the back side portion of the disposable diaper of the first embodiment. FIG. 13 is a schematic view showing an apparatus suitably used for manufacturing the composite sheet shown in FIG. FIG. 14 is a diagram in which a state where the convex portion of the second roll is engaged with the peripheral surface of the central region forming portion of the first roll is developed in a plane. FIG. 15 is a diagram in which a state where the convex portion of the second roll is engaged with the peripheral surface of the side region forming portion of the first roll is developed in a plane.

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.
1 and 2 show a basic structure of a disposable diaper 100 (hereinafter also simply referred to as diaper 100), which is an embodiment of the absorbent article of the present invention.
As shown in FIGS. 1 and 2, the diaper 100 includes a liquid-permeable top sheet 12, a liquid-impermeable back sheet 13, and an absorber 14 disposed between the sheets 12 and 13. With respect to the back sheet 13, the liquid impermeability is a concept including poor liquid permeability, and includes cases where the back sheet 13 is made of a water-repellent sheet or the like in addition to the case where the liquid does not pass through the liquid at all.

  The diaper 100 has an article longitudinal direction Xa which is a direction coinciding with the wearer's front-rear direction when worn, and an article width orthogonal to the article longitudinal direction Xa in a state where the diaper 100 is expanded in a planar shape as shown in FIG. Direction Ya. Further, the diaper 100 includes, in the article longitudinal direction Xa, an abdominal side A that is disposed on the abdomen side of the wearer when worn, a back side B that is disposed on the back side of the wearer when worn, and an abdominal side part A. The crotch portion C is located between the back side portion B and the back side portion B. The diaper 100 is an unfolded disposable diaper. Fastening tapes 17 are provided on both side edges of the back side B, and a landing zone 18 that fastens the fastening tape 17 to the outer surface of the abdominal side A. Is provided.

  The absorbent body 14 in the diaper 100 includes an absorbent core 14a and a core wrap sheet 14b that wraps the absorbent core 14a. The absorptive core 14a can be comprised from the laminated fiber body of liquid absorbing fibers, such as a pulp fiber, for example, and the mixed fiber body of a liquid absorbing fiber and a water absorbing polymer. Examples of the liquid-absorbing fiber include cellulose-based hydrophilic fibers such as pulp fiber, rayon fiber, cotton fiber, and cellulose acetate. In addition to cellulosic hydrophilic fibers, fibers made of a synthetic resin such as polyolefin, polyester, polyamide, etc., made hydrophilic with a surfactant or the like can also be used. As the core wrap sheet 14b, for example, tissue paper or a water-permeable nonwoven fabric is used. One core wrap sheet 14b may wrap the entire absorbent core 14a, or a combination of two or more sheets may wrap the absorbent core 14a. As the back sheet 13, a liquid-impermeable or water-repellent resin film, a laminate sheet of a resin film and a nonwoven fabric, or the like is used.

  Sheets 15 for forming a three-dimensional gather having elastic members 15a are arranged on both sides of the article longitudinal direction Xa in the diaper 100, and the skin of the wearer is placed on the crotch portion C in a worn state by contraction of the elastic members 15a. A three-dimensional gather standing up toward the side is formed. In addition, the leg elastic member 16 is disposed in an extended state at a portion disposed around the leg in the crotch C. Due to the contraction, the leg crotch C fits around the wearer's leg in the worn state. Leg gathers that improve

  The fastening tape 17 in the diaper 100 is composed of a tape base material 17a and a male member of a mechanical hook-and-loop fastener that is joined to the tape base material 17a to form a fastening portion 17c. It is formed by joining a female member of a mechanical hook-and-loop fastener or a non-woven fabric rich in engagement. A part of the tape base material 17a of the fastening tape 17 forms a fixing portion 17b fixed in a state of being sandwiched between the back sheet 13 and the three-dimensional gather forming sheet 15. Between the left and right fastening tapes 17, 17, a plurality of elastic members 19 that contract the diaper 100 in the width direction are arranged at intervals in the longitudinal direction Xa of the diaper. The plurality of elastic members 19 are arranged as an elastic sheet 19s configured to be fixed between two nonwoven fabrics or two folded nonwoven fabrics, and are included in the end portion of the elastic sheet 19s or the elastic sheet 19s. It is preferable that the end portion of each elastic member 19 overlaps the fixing portion 17b. The fastening portion 17c of the fastening tape 17 may be an adhesive portion formed by applying an adhesive to the tape base material 17a. As the tape base material 17a, various known materials such as a nonwoven fabric are used.

The surface sheet 12 in the disposable diaper 100 of 1st Embodiment is comprised from the composite sheet 10 shown in FIG.
As shown in FIG. 3, the composite sheet 10 includes a first direction X along the longitudinal direction (article longitudinal direction) Xa of the diaper 100 and a second direction Y along the width direction (article width direction) Ya of the diaper 100. Have. Further, as shown in FIG. 3, the composite sheet 10 includes a central region M in which the convex portions 4 are formed in different patterns and a pair of side regions S and S located on both sides of the central region M. Yes. The central region M is located in the central portion of the diaper 100 in the width direction (article width direction) Ya, and the pair of side regions S and S are formed outside both side edges along the second direction Y of the central region M. ing. The central region M having the protrusions 4 formed in different patterns and the side regions S, S on both sides thereof are preferably formed at least in the crotch portion C in the longitudinal direction Xa of the diaper 100. It is preferably formed from C to either one or both of the ventral side A and the back side B, or the entire length of the absorbent body 14, and further to the entire length of the diaper 100. Is preferred.

  4 is an enlarged perspective view showing a part of the central region M of the composite sheet 10, and FIG. 5 is an enlarged perspective view showing a part of the side region S of the composite sheet 10. It is shown. The side regions S are formed at positions symmetrical with respect to a center line (not shown) along the longitudinal direction Xa of the diaper 100, and irregularities are formed in each side region S in the pattern shown in FIG. ing.

  As shown in FIGS. 4 and 5, the composite sheet 10 includes a plurality of laminated first sheets 1 and 2 that are partially joined by embossing in both the central region M and the side region S. The first sheet 1 protrudes in a direction away from the second sheet 2 at a portion other than the bonding part, and forms a convex part protruding toward the wearer's skin side. . The composite sheet 10 has a substantially flat surface on the second sheet 2 side in both the central region M and the side region S, and has unevenness on the first sheet 1 side.

  The first sheet 1 and the second sheet 2 are made of a sheet material. As the sheet material, for example, a fiber sheet such as a nonwoven fabric, a woven fabric, and a knitted fabric, a film, and the like can be used. From the viewpoint of touch and the like, it is preferable to use a fiber sheet, and it is particularly preferable to use a nonwoven fabric. The kind of sheet material which comprises the 1st sheet | seat 1 and the 2nd sheet | seat 2 may be the same, or may differ.

Examples of the nonwoven fabric used when the nonwoven fabric is used as the sheet material constituting the first sheet 1 and the second sheet 2 include air-through nonwoven fabric, spunbond nonwoven fabric, spunlace nonwoven fabric, meltblown nonwoven fabric, resin bond nonwoven fabric, and needle punch nonwoven fabric. It is done. A laminate obtained by combining two or more of these nonwoven fabrics, or a laminate obtained by combining these nonwoven fabrics and a film can also be used. Among these, it is preferable to use an air-through nonwoven fabric or a spunbonded nonwoven fabric. The basis weight of the nonwoven fabric used as the sheet material constituting the first sheet 1 and the second sheet 2 is 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, it is 35 g / m ² or less. The basis weight of the nonwoven fabric is preferably 10 g / m ² or more and 40 g / m ² or less, more preferably 15 g / m ² or more and 35 g / m ² or less.

  As the fibers constituting the nonwoven fabric, fibers made of various thermoplastic resins 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 alone or as a blend of two or more. Further, it can be used in the form of a composite fiber such as a core-sheath type or a side-by-side type.

  The composite sheet 10 has a central first convex portion 41 as a convex portion having the maximum height in the central region M, and has a first side convex portion 41 ′ as a convex portion having the maximum height in the side region S. Yes. And the center 1st convex part 41 is high compared with the side 1st convex part 41 '. Further, the central region M having the central first convex portion 41 has a larger amount of compressive deformation than the side region S having the first side convex portion 41 ′.

The height of the central first convex portion 41 is higher than the height of the side first convex portion 41 ′, and the amount of compressive deformation of the central region M having the central first convex portion 41 is the side having the side first convex portion 41 ′. According to the disposable diaper 100 of 1st Embodiment by being larger than the amount of compressive deformation of the area | region S, the following effects are show | played.
That is, as shown in FIG. 6, when the composite sheet 10 is pressed by the pressure from the wearer's skin during wearing of the diaper 100, the center of the central region M located in the vicinity of the wearer's liquid discharge portion. The one convex portion 41 is higher in height than the side first convex portion 41 ′, and the amount of compressive deformation as the central region M is larger than the amount of compressive deformation of the side region S, so that FIG. As shown in FIG. 3, the fiber density in the vicinity of the root K of the convex portion 41 is increased by compression, while the vicinity of the top portion is flexibly deformed to show a good touch. Therefore, the diaper 100 excellent in absorption performance can be obtained by disposing the central region M in a portion disposed near the wearer's liquid discharge portion and forming a number of points that quickly absorb the liquid.
On the other hand, the side first convex portion 41 ′ formed in the side region S is lower in height than the central first convex portion 41, and the amount of compressive deformation as the side regions S and S is also the compressive deformation of the central region M. By being smaller than the amount, even if the composite sheet 10 is pressurized by the pressure from the wearer's skin, the state of being relatively hard to be crushed and having a small contact area with the skin is maintained relatively stably. Therefore, the air permeability of the diaper 100 is increased and the stuffiness is further effectively suppressed.
Due to such an action, the disposable diaper 100 of the first embodiment is excellent in both air permeability and liquid drawability.

From the viewpoint of ensuring such an effect, the height H1 of the central first convex portion 41 (see FIG. 9A) is set to the height H1 ′ of the side first convex portion 41 ′ [see FIG. 11] is preferably 105% or more, more preferably 110% or more, preferably 200% or less, more preferably 150% or less, and preferably 105% or more and 200% or less, more preferably Is 110% or more and 150% or less.
The height H1 of the central first convex portion 41 is preferably 0.5 mm or more, more preferably 1 mm or more, preferably 5 mm or less, more preferably 4 mm or less, and preferably 0.5 mm or more and 5 mm. Hereinafter, it is more preferably 1 mm or more and 4 mm or less.
The height H1 ′ of the side first convex portion 41 ′ is preferably 0.3 mm or more, more preferably 0.6 mm or more, preferably 4 mm or less, more preferably 3 mm or less, and preferably 0. 3 mm or more and 4 mm or less, more preferably 0.6 mm or more and 3 mm or less.
Further, the difference between the height H1 of the central first convex portion 41 and the height H1 ′ of the side first convex portion 41 ′ is preferably 0.1 mm or more, assuming that the height H1> the height H1 ′. More preferably, it is 0.2 mm or more, preferably 2 mm or less, more preferably 1 mm or less, preferably 0.1 mm or more and 2 mm or less, more preferably 0.2 mm or more and 1 mm or less.

  Regarding the convex portion 4 of the composite sheet 10, the height is a distance from the lower surface of the second sheet 2 directed to the absorber 14 side to the upper surface of the first sheet 1 that forms the top of the convex portion 4.

The amount of compressive deformation in the central region M and the amount of compressive deformation in the side region are measured as follows.
[Measurement method of compression deformation]
A sample is cut into a predetermined size, and after measuring the thickness in a state where the measurement site is pressurized at 0.1 kPa, the thickness is measured in a state where the pressure is applied at 2.0 kPa. The difference obtained by subtracting the thickness measured under 2.0 kPa from the thickness measured under 0.1 kPa is defined as the amount of compressive deformation.
The number of measurement points is arbitrary 3 or more per sheet, and the thickness is obtained by averaging two samples (6 or more measurement points).
As samples for measurement, two samples cut out from two surface sheets (composite sheets) were used, and the measurement sites were arbitrary three or more for each of the central region and the left and right side regions of each sample. .
A rectangular plate of 20 mm × 30 mm is placed on each measurement site, and the thickness under a load of 2.0 kPa and the thickness under a load of 0.1 kPa are measured for each measurement site.
The thickness here is a thickness as a central region including a plurality of central first convex portions 41 or a side region including a plurality of side first convex portions 41 ′.
Then, for each measurement site, the thickness difference is calculated by subtracting the thickness under the load of 2.0 kPa from the thickness under the load of 0.1 kPa.
For the central region, the average value of the thickness differences for a total of 6 or more measurement sites is the amount of compressive deformation of the central first convex portion 41, and for the left and right side regions, a total of 12 or more measurement sites are measured. Let the average value of the thickness difference be the amount of compressive deformation of the side first convex portion 41 ′.
For example, when measuring a diaper sample in a state of being compressed and packed in a package, the surface sheet is peeled off from the diaper, and the sample left for one day or more is cut into a predetermined size with a sharp razor. A flat plate with a load adjusted to 0.1 kPa is placed so as to cover the entire surface of the cut sample, and after 1 minute or more has elapsed, the distance from the horizontal support surface on which the sample is placed to the flat plate is measured. Thereafter, the same measurement is performed at 2.0 kPa.
When it is difficult to measure with the naked eye, the section of the cut sample may be observed and measured at a magnification of 20 to 100 times using, for example, a microscope (VHX-1000 manufactured by KEYENCE).

The height H1 of the central first convex portion 41 and the height H1 ′ of the side first convex portion 41 ′ are measured as follows.
[Measurement method of height of convex part]
The sample is cut with a sharp razor, the cut end face is observed, and the shortest distance between the lower surface of the second sheet 2 and the upper surface of each convex portion top is measured. Let the obtained value be the height of each convex part. When it is difficult to measure with the naked eye, the section of the cut sample may be measured by observing at a magnification of 20 to 100 times using, for example, a microscope (VHX-1000 manufactured by KEYENCE). Further, for example, when measuring a diaper sample in a state of being compressed and packed in a package, the surface sheet is peeled off from the diaper, and the value obtained by measuring in the same manner as described above is used for the sample left for one day or more. The height of each convex part is measured under no load.

The said composite sheet 10 used for the surface sheet 12 of the diaper 100 of 1st Embodiment is further demonstrated.
[Configuration of the central region M of the composite sheet 10]
FIG. 8 shows an enlarged plan view of the central region M of the composite sheet 10 shown in FIG. 9A to 9C are a cross-sectional view taken along the line Va-Va, a cross-sectional view taken along the line Vb-Vb, and a cross-sectional view taken along the line Vc-Vc in FIG.
As shown in FIGS. 3, 4, and 8, in the central region M of the composite sheet 10, a central continuous convex portion 40 that extends continuously in the second direction Y is separated from the first direction X by a certain distance. A plurality of lines are formed. In each of the central continuous convex portions 40, as shown in FIG. 8 and FIG. 9A, the central first convex portions 41 alternately arranged in the second direction Y and the central first convex portions 41 are higher. The lower central second convex portion 42 is connected to each other. In this specification, a convex part is connected that two adjacent convex parts are not separated by a joint part, and a part of one convex part forms a part of the other convex part. And a part of the other convex part forms a part of the one convex part.
The central first convex portion 41 and the central second convex portion 42 constituting the central continuous convex portion 40 preferably have a cavity at least on the back side of the central first convex portion 41, and have a cavity on each back side, The hollow of the back surface of the center 1st convex part 41 and the cavity of the back surface of the center 2nd convex part 42 continue, and the continuous hollow part extended continuously along the 2nd direction Y on the back side of the center continuous convex part 40 More preferably, 40V is formed.
As shown in FIG. 8, each of the central first convex portion 41 and the central second convex portion 42 constituting the central continuous convex portion 40 has a substantially circular shape in plan view. Further, the central first convex portion 41 and the second convex portion 42 have a shape having a top portion in the cross section in any of the first direction X and the second direction Y.

As shown in FIG. 8, the central region M of the composite sheet 10 extends in the second direction Y and continues in the second direction Y, and has no joint portion in the second direction Y. Embossed regions E that extend and have joints formed in a regular pattern are alternately formed in the first direction X.
In the embossed region E, a first joint 31 and a second joint 32 are formed as joints formed by partially joining the laminated first sheet 1 and second sheet 2 by embossing. ing. In these joint portions 31 and 32, the first sheet 1 and the second sheet 2 are integrally pressed by embossing, and both the sheets are higher in density than the other portions, preferably Are thermally fused between the two sheets by melting of the constituent resin of one or both sheets and subsequent solidification.

In each embossed region E, the first joint portion 31 and the second joint portion 32 have different arrangement positions in the second direction Y as shown in FIG. Further, the first joint portion 31 and the second joint portion 32 are also different in lengths L1 and L2 along the second direction Y. Each of the first joint portions 31 has a rectangular shape in plan view, and each side of the rectangle coincides with the first direction X or the second direction Y. The second joint portion 32 has a substantially square shape in plan view, and each side of the square coincides with the first direction X or the second direction Y.
The first joint portions 31 having a rectangular shape are arranged in a line at intervals along the second direction Y with the long sides thereof aligned with the first direction X. Thereby, the first joint portion row R1 along the second direction Y is formed. The second joint portions 32 are arranged in a line at intervals along the second direction Y, with one of two sides orthogonal to each other coinciding with the second direction Y and the other side with the first direction X. ing. Thereby, the second joint row R2 along the second direction Y is formed.
In each first joint row R1, the arrangement interval of the first joints 31 in the second direction Y is constant. In each second joint row R2, the arrangement intervals of the second joint portions 32 in the second direction Y have two types of intervals, and alternately have wide portions and narrow intervals. . In each first joint row R1, the arrangement positions of the first joints 31 when viewed along the second direction Y are all the same. Also in each second joint row R2, the arrangement positions of the second joints 32 when viewed along the second direction Y are all the same.

Each embossed region E includes one first joint row R1 and two second joint rows R2 located on both sides in the first direction X, as shown in FIG.
When attention is paid to one first joint 31 constituting the first joint row R1, a total of four second joints 32 constituting two second joint rows R2 are formed around the first joint 31. The four corners of the first joint portion 31 are arranged close to each other with the corners facing each other. Accordingly, a group of joint portions 30 including one first joint portion 31 and four second joint portions 32 located around the first joint portion 31 is formed. In each embossed region E, a plurality of similar joint groups 30 are formed along the second direction Y at regular intervals.

  In the composite sheet 10, the first joint portion 31 and the second joint portion 32 are formed in the above-described manner, and the portion corresponding to the non-embossed region N in the first sheet 1 when the composite sheet 10 is manufactured. 8 or the embossed region E in the central region M of the composite sheet 10 by pressing the portion corresponding to the portion between the first joint portions 31 from the back surface side or sucking from the front surface side. A central continuous convex portion 40 including a central first convex portion 41, a central third convex portion 43, and the like having a plan view shape and a cross-sectional shape as shown in FIG. 9 are formed.

  The central continuous convex portion 40 of the central region M of the composite sheet 10 used in the first embodiment extends continuously in the second direction Y and has a portion whose width is regularly narrowed in the second direction Y. . Specifically, as shown in FIG. 8, a central first convex portion 41 is formed between a pair of first joint portions 31 that are opposed to each other with the non-embossed region N interposed therebetween, and are opposed to each other with the non-embossed region N interposed therebetween. A central second convex portion 42 is formed in a region surrounded by a total of four second joint portions 32 composed of two pairs of second joint portions 32, and the center in the direction along the first direction X is the center. The length L42 of the central second convex portion 42 is shorter than the length L41 of the first convex portion 41. The central continuous convex portion 40 is a constricted portion whose width (length in the first direction X) is narrower than that of the central first convex portion 41 in the central continuous convex portion 40. .

  The composite sheet 10 used in the first embodiment has a discontinuous central third convex portion 43 surrounded by an annular concave portion in the embossed region E as shown in FIGS. 8 and 9C. have. The central third convex portion 43 has a shape having a top portion in the cross section in any of the first direction X and the second direction Y. The central third convex portion 43 is lower than the central first convex portion 41. The center third convex portion 43 has the cavity 43V on the back side thereof, but may not have such a cavity 43V.

As shown in FIG. 8, a plurality of the central third convex portions 43 are linearly arranged in a row at a constant distance along the second direction Y to form the central third convex portion row. doing. The central second convex portion 42 and the central third convex portion 43 are formed at the same position in the second direction Y. More specifically, the central second convex portions 42 and the central third convex portions 43 are arranged alternately and linearly along the first direction X. The central third convex portion 43 is located between the central first convex portions 41 and 41 in the directions Da and Db intersecting the second direction Y. The directions Da and Db intersecting the second direction Y in the present embodiment are directions inclined with respect to the first direction X and the second direction Y, respectively, but the central third convex portion 43 is in the second direction Y. In the first direction X, which is a direction intersecting with the center first convex portions 41, 41 may be located between each other.
Further, as shown in FIG. 8, when attention is paid to the fourth convex portion 44 in addition to the central second convex portion 42 and the central third convex portion 43, these three types of convex portions are the central second convex portion 42 and the central second convex portion 42. The 4th convex part 44, the center 3rd convex part 43, and the 4th convex part 44 are arrange | positioned regularly and linearly along the 1st direction X in this order.
The upper surface of the fourth convex portion 44 is generally flat. Although the fourth convex portion 44 is literally a “convex portion”, the fourth convex portion 44 is relatively more than any of the central first and second convex portions 41, 42 constituting the central continuous convex portion 40. Since the height is relatively low and the height is relatively lower than that of the central third convex portion 43, the concave portions are relatively viewed from these convex portions.

  The central region M of the composite sheet 10 used in the present embodiment includes the first central convex portion 41, the central second convex portion 42, the central third convex portion 43, and the fourth portion described above on the first sheet 1 that constitutes the central region M. A convex portion 44 is formed. The height of the fourth convex portion 44 is lower than any of the central first convex portion 41, the central second convex portion 42, and the central third convex portion 43.

[Configuration of Side Area S of Composite Sheet 10]
As shown in FIG. 3, in the pair of side regions S, S of the composite sheet 10, the first sheet 1 has a convex portion formed so as to protrude in a direction away from the second sheet 2 in a portion other than the joint portion. It is formed in a pattern different from the convex portion in the central region M. The expression that the pattern of the convex part is different includes any of the case where only the arrangement of the convex part is different, the case where the form of the convex part is different, and the case where both are different. The aspect in which the arrangement of the convex portions is different includes a case where the distance between the convex portions is different. Moreover, the aspect from which the form of a convex part differs also includes the case where the planar view shape of a convex part differs.
In the composite sheet 10 of the present embodiment, the arrangement and form of the protrusions are different between the central region M and the pair of side regions S, S.

FIG. 10 shows an enlarged plan view of the side region S of the composite sheet 10 shown in FIG. 11 is a cross-sectional view taken along line Vd-Vd in FIG.
As shown in these drawings, in the side region S of the composite sheet 10, the third joint 33 is regularly arranged with two kinds of intervals La and Lb along the second direction Y. A plurality of columns R are formed in the first direction X. More specifically, the second direction joint line R includes a first distance La and a second distance Lb wider than the first distance La as the distance between the third joints 33 in the second direction Y. The plurality of third joint portions 33 in the second direction joint portion row R are intermittently arranged in the second direction Y so as to have these two kinds of intervals alternately in the second direction Y. ing.

  The plurality of third joint portions 33 constituting each second direction joint portion row R have the same length and arrangement position in the first direction X, and are adjacent to each other in the first direction X. A gap having a constant width W is formed between R. In addition, the second direction joint row R formed in a plurality of rows in the first direction X has the arrangement positions of the third joints 33 in the second direction Y every other row, and is adjacent to the second direction. In the joint portion rows R, the arrangement positions of the third joint portions 33 in the second direction Y are different from each other. Specifically, in the side region S of the composite sheet 10 in the present embodiment, as shown in FIG. 10, the arrangement positions of the third joint portions 33 in the second direction Y are mutually arranged as the second direction joint portion row R. Different second direction first joint rows R3 and second direction second joint rows R4 are alternately formed in the first direction X, and the arrangement position of the third joint 33 in the second direction Y is different. In the second direction first joint row R3 and the second direction second joint row R4, the first joint in the other joint row R is between the third joints 33 adjacent to each other at the second interval Lb. A pair of third joint portions 33 that are adjacent to each other at the interval La are positioned.

Then, as shown in FIG. 10, in the region surrounded by a total of six joints 33 including the two third joints 33 and 33 adjacent in the second direction joint row R, the side first One convex portion 41 'is formed.
In the composite sheet 10 of the present embodiment, each pair of second-direction joint portions R includes a pair of joint portions 34 including a pair of third joint portions 33 that are disposed close to each other in the second direction Y at the first interval La. In the second direction Y, the side first convex portion 41 ′ is intermittently disposed at an interval Lb that is twice or more the first interval La, and the side first convex portion 41 ′ is located between the adjacent joint pairs 34 and 34 in the second direction Y. Is formed. The joint portion pair 34 includes a pair of third joint portions 33 that are adjacent to each other at the narrowest interval La in the second direction joint portion row R.

  In the composite sheet 10, the third joint portion 33 is formed in the above-described manner, and a region surrounded by a total of six third joint portions 33 in the first sheet 1 when the composite sheet 10 is manufactured. The portion corresponding to is pressed from the back surface side or sucked from the front surface side, and the like in the side regions S and S of the composite sheet 10 in a plan view shape and a cross-sectional shape as shown in FIGS. A large number of side first convex portions 41 ′ are formed.

As shown in FIGS. 3, 5, and 10, in the side region S of the composite sheet 10, the side first convex portions 41 ′ are formed in the composite sheet 10 in the form of dotted spots in plan view, more specifically in a staggered pattern. Is formed. The side first convex portion 41 ′ is surrounded by the six third joint portions 33 described above. The six third joint portions 33 surrounding the side first convex portions 41 ′ and the portions between the third joint portions 33 adjacent to each other in the six third joint portions 33 are the central portions of the side first convex portions 41 ′. Is formed in a state of being dispersed in the planar direction of the composite sheet 10.
More specifically, as shown in FIG. 10, an angle θ (see FIG. 10) between the first virtual straight line L <b> 3 and a plurality of first virtual straight lines L <b> 3 parallel to each other on the composite sheet 10 in plan view. Assuming a plurality of second virtual straight lines L4 that are parallel to each other, the side first convex portion 41 ′ is located at each intersection of the first virtual straight line L3 and the second virtual straight line L4. . The angle θ (see FIG. 10) formed by the first virtual line L3 and the second virtual line L4 is preferably 30 ° or more and 165 ° or less, and more preferably 45 ° or more and 150 ° or less. The first imaginary straight line L3 and the second imaginary straight line L4 may be drawn so that the side first convex portion 41 ′ is located at the intersection of both. In the example shown in FIG. 10, the first virtual line L3 and the second virtual line L4 are both inclined with respect to the first direction X and the second direction Y, but the first virtual line L3 and the second virtual line L4 are inclined. Either one or both of the straight line L3 and the second virtual straight line L4 may be parallel to the first direction X or the second direction Y.

In the side region S of the composite sheet 10, a plurality of side first convex portions 41 ′ are arranged at regular intervals along a plurality of third direction convex portion rows in series along the first imaginary straight line L 3. The side first convex portions 41 ′ are formed with a plurality of fourth direction convex portion rows arranged in series along the second virtual straight line L4 at a constant interval. In addition, a third direction joint row R5 in which a plurality of joint pairs 34 are arranged in series at a constant interval is formed between adjacent third direction convex rows, and between adjacent fourth direction convex rows. A fourth direction joint row R6 in which a plurality of joint pairs 34 are arranged in series at a constant interval is formed. The first imaginary straight line L3 extends in parallel between a plurality of joint pairs (third joint rows) R5 in which a plurality of joint pairs 34 (or a plurality of joints 33) are arranged in series at a constant interval. Assuming that the second imaginary straight line L4 is parallel to the joint row (third joint row) R6 in which a plurality of joint pairs 34 (or a plurality of joints 33) are arranged in series at a constant interval. It is preferable to assume that it extends.
Between the pair of third joints constituting each joint pair 34 and between the pair of adjacent joints 34 around the side first convex part 41 ′, there are minute convex parts 44 ′. The convex portion 44 ′ has a height that slightly protrudes from the upper surface of the third joint portion 33, and usually the height H4 ′ is 1/3 or less of the side first convex portion 41 ′.
Therefore, an air passage through which air easily flows is provided between the third direction convex row and between the fourth direction convex rows, and excellent air permeability is obtained.

In the first embodiment, as described above, a plurality of central continuous convex portions 40 configured to include the central first convex portion 41 are formed in the central region M of the composite sheet 10 used as the top sheet 12. On the other hand, in the side region S, side first convex portions 41 ′ are formed in a dotted shape.
Therefore, a high density region of fibers generated near the root K of the convex portion due to compression of the central first convex portion 41 is generated in a large number or continuously along the central continuous convex portion 40, and the liquid absorption performance in the central region M is improved. Further improve. In addition, in the side region S, the side first convex portions 41 ′ are formed in a dotted shape, so that the side first convex portions 41 ′ are more difficult to deform with respect to pressure.
By these, air permeability and liquid drawing-in property can be further improved.

The central continuous convex portion 40 preferably extends in the article width direction Ya (second direction Y), but the same applies to the case where the center continuous protrusion 40 extends in the article longitudinal direction Xa (first direction X). An effect is obtained.
Further, in the first embodiment, the central continuous convex portion 40 formed in the central region M of the composite sheet 10 has a central first convex portion 41 and a central second convex portion that is lower than the central first convex portion 41. Although the convex portion 42 is alternately connected, the central first convex portion, which is the convex portion having the maximum height, may be continuously provided. In that case, the same effect can be obtained.
Further, in the side region S, only the first side convex portion 41 ′ having the maximum height and the above-described minute convex portion 44 ′ may be formed as in the present embodiment. 2nd convex part (not shown) which has thickness may be further formed, for example, it is distributed in the state where side 1st convex part 41 'and 2nd convex part (not shown) were mixed in the plane direction. You may do it.

Moreover, in 1st Embodiment, the center continuous convex part 40 formed in the center area | region M of the composite sheet 10 is extended along the article width direction Ya (2nd direction Y). The first side projections 41 'are located at the intersections of the lattice described above. Therefore, the moisture generated from the liquid absorbed by the high density region of the fiber generated in the vicinity K of the convex portion formed in the central region M is the continuous hollow portion 40V formed in the central continuous convex portion 40 or the central continuous portion. Diffuses in the width direction passing between the convex portions 40, and is effectively diffused to the entire side surfaces passing between the third direction convex portion rows and between the fourth direction convex portion rows formed in the side region S. Therefore, the stuffiness at the time of wearing can be suppressed further.

In the composite sheet 10 used in the first embodiment, since the central third convex portion 43 in the central region M is a central first convex portion 41 is sandwiched, upon pressurization, center within the central first convex portion 41 A portion higher than the height of the third convex portion 43 is deformed in the plane direction, and a portion lower than the height of the central third convex portion 43 is less likely to be deformed in the plane direction. A fiber density gradient in which the fiber density increases from the portion B1 toward the portion B2 is likely to occur between the top portion B1 deformed by pressurization and the vicinity portion B2 of the joining point of the second sheet 2. Thereby, the drawing-in property of the liquid from the first sheet 1 to the second sheet 2 is further excellent.

Further, the center third convex portion 43 in the central region M has a height H3 equal to the height H1 ′ of the side first convex portion 41 ′.
Since the pressure applied to the topsheet 12 can be dispersed when the center first convex portion 41 is crushed due to the equal height, the side first convex portion 41 ′ of the side region S is more difficult to deform with respect to the pressure. Further, the air permeability in the side region S can be ensured more reliably.
In addition, in the expression that the height is equal, in addition to the case where the height H3 of the central third convex portion 43 and the height H1 ′ of the side first convex portion 41 ′ are strictly equal, the central third convex portion 43 Including the case where the difference between the height H3 of the first side convex portion 41 ′ and the height H1 ′ of the side first convex portion 41 ′ (the absolute value of H3−H1 ′) is within 10% of the height H3 of the central third convex portion 43. It is.

  In the composite sheet 10 used in the first embodiment, as shown in FIG. 8, a plurality of central third convex portions 43 in the central region M are formed along the second direction Y, and in the second direction Y, A first joint portion 31 that is a vertically long joint portion that is long in the first direction X is formed between adjacent central third convex portions 43. A fiber density gradient in which the fiber density increases from the top of the central first convex portion 41 toward the first joint portion 31 due to the presence of the first joint portion 31 that is a vertically long joint portion between the central third convex portions 43. Is more easily formed, and the liquid absorbability is further improved.

Moreover, in the disposable diaper 100 of 1st Embodiment, the composite member mentioned above in elastic member arrangement | positioning area | region BM (refer FIG. 1) by which the several elastic member 19 was arrange | positioned in the width direction center part of the back side part B at least. The central region M of the sheet 10 is arranged, and the central continuous convex part 40 configured to include the above-described central first convex part 41 is extended in the second direction Y in the elastic member arrangement region BM. A line is formed.
Then, as shown in FIG. 12, the width of the central continuous convex portion 40 in the elastic member arrangement region BM is P1, the interval between the elastic members 19 is P2, and the interval between the central portions of the central continuous convex portion 40 is P3. The relationship of P1 <P2 <P3 is satisfied.

The plurality of elastic members 19 in the disposable diaper 100 are for shrinking the diaper in the width direction to improve the fit in the back side portion B, but are overlapped with the region BM where the plurality of elastic members 19 are arranged. When the central continuous convex portion 40 and the elastic member 19 of the composite sheet 10 constituting the surface sheet 12 to be disposed satisfy the above relationship, the elastic member 19 causes the back side portion B of the diaper 100, particularly the absorber 14. Even in a state where the portion extending to the back end portion side contracts in the second direction Y along the article width direction Ya, the shape of the central continuous convex portion 40 is easily maintained, and the liquid absorption effect is hardly impaired. Thereby, the liquid absorption effect in the back side part B increases, and the liquid leakage from the back side part B side can be suppressed.
Further, when the first joint portions 31 as the longitudinal joint portions described above are arranged at equal intervals in the second direction Y along the article width direction Ya, the contraction of the central continuous convex portion 40 accompanying the contraction of the elastic member 19. However, it becomes regular and a density gradient of the fiber density is also formed in the central continuous convex portion 40, and the liquid absorption effect in the back side portion B is further enhanced.

The first joint portion 31 that is a vertically long joint portion preferably has a length along the first direction X of 1.2 times or more, particularly 1.5 times or more of the length along the second direction Y, Further, it is preferably 5 times or less, particularly preferably 3 times or less, more specifically 1.2 times or more and 5 times or less, particularly preferably 1.5 times or more and 3 times or less.
In addition, the first joint portion 31 that is a vertically long joint portion has a length along the first direction X that is 1.2 times or more the length along the first direction X of the second joint portion 32, particularly 1.5. Is preferably 5 times or less, more preferably 5 times or less, and particularly preferably 3 times or less, and more specifically 1.2 times or more and 5 times or less, particularly 1.5 times or more and 3 times or less. Is preferred.

The length along the first direction X of the first joint portion 31 that is a longitudinally long joint portion is preferably 0.5 mm or more, particularly preferably 1 mm or more, more preferably 10 mm or less, and particularly preferably 5 mm or less. Is preferably from 0.5 mm to 10 mm, particularly preferably from 1 mm to 5 mm.
The length along the first direction X of the second joint portion 32 is preferably 0.1 mm or more and 5 mm or less, particularly preferably 0.5 mm or more and 3 mm or less, and the length along the second direction Y is 0.00. It is preferably 1 mm or more and 5 mm or less, particularly 0.5 mm or more and 3 mm or less.
Further, the third joint portion 33 preferably has a length along the first direction X of 0.1 mm to 5 mm, particularly 0.5 mm to 3 mm, and a length along the second direction Y of 0. It is preferably 1 mm or more and 5 mm or less, particularly 0.5 mm or more and 3 mm or less.
Further, in the second direction joint portion row R for the third joint portion 33, the interval La between the third joint portions 33 in the second direction Y is large between the third joint portions 33 in the narrow portion. 2 times or more, particularly 2.5 times or more, preferably 5 times or less, particularly 4 times or less, preferably 2 times or more and 5 times or less, particularly 2.5 times or more 4 times. It is preferable that it is less than 2 times.

  The heights H2, H3, H4, and H4 ′ of the convex portions 42, 43, 46, and 44 ′ are directed toward the absorber 14 in the same manner as the central first convex portion 41 and the side first convex portion 41 ′. The height H1 of the central first convex portion 41 is defined as the distance from the lower surface of the second sheet 2 to the upper surface of the first sheet 1 that forms the top of the convex portion 4 (FIGS. 9 and 11). And, it is measured in the same manner as the measuring method of the height H1 ′ of the side first convex portion 41 ′.

  Next, a preferred method for manufacturing the composite sheet 10 having the above-described configuration will be described with reference to FIGS. As shown in FIG. 13, the manufacturing method of the composite sheet 10 includes a first roll 111 having a concavo-convex shape on the peripheral surface, and a concavo-convex shape having a mesh shape with the concavo-convex shape of the first roll on the peripheral surface. While the two rolls 112 are rotated in directions opposite to each other, the first sheet 1 is supplied to the meshing portions of the two rolls 111 and 112 to form the first sheet 1 with irregularities. Further, in the manufacturing method of the composite sheet 10, after the shaping step, the first sheet 1 is held as it is along the peripheral surface portion of the first roll 111 and moved from the meshing portion, and then the second sheet 2 is moved to the first sheet 1. The two sheets 1 and 2 are supplied so as to be superimposed on the sheet 1 and are partially joined by being sandwiched between the convex portion of the first roll 111 and the first heat roll 113 and the second heat roll 114 under heating. A joining step to be performed.

  As shown in FIG. 13, the second roll 112, the first heat roll 113, and the second heat roll 114 are disposed to face the peripheral surface of the first roll 111. The second roll 112, the first heat roll 113, and the second heat roll 114 are arranged in that order from the upstream side in the rotation direction R of the first roll 111 toward the downstream side. Details of the first roll 111 and the second roll 112 whose peripheral surfaces are uneven are described later. The 1st heat roll 113 and the 2nd heat roll 114 are flat anvil rolls which do not have unevenness in a peripheral surface, respectively.

  First, the first sheet 1 is fed out from a raw roll (not shown) of the first sheet 1. Separately from this, the second sheet 2 is fed out from a raw roll (not shown) of the second sheet 2. Then, as shown in FIG. 13, the first sheet 1 that has been fed out is engaged with the meshing portion of the first roll 111 and the second roll 112, and the first sheet 1 is unevenly shaped. At this time, the 1st roll 111 is attracted | sucked toward the inside of a roll from the surrounding surface, and the uneven | corrugated shaping of the 1st sheet | seat 1 is promoted.

  Next, as shown in FIG. 13, the first sheet 1 is continuously sucked to the peripheral surface of the first roll 111 to keep the shaped state, and the second sheet 2 is overlapped. A pressure is applied between 111 and the first heat roll 113 having a smooth circumferential surface. At this time, both the first roll 111 and the first heat roll 113 or only the first heat roll 113 are heated to a predetermined temperature. Thereby, the 1st sheet | seat 1 and the 2nd sheet | seat 2 which are located on the convex part 11a in the 1st roll 111 are joined by heat sealing | fusion, and the junction parts 31-33 are formed.

  Next, the superposed body of the first sheet 1 and the second sheet 2 joined by heat fusion is moved under the state of being continuously sucked and held on the peripheral surface of the first roll 111, and the superposed body is moved to the first A pressure is applied between the roll 111 and the second heat roll 114 having a smooth circumferential surface. At this time, both the first roll 111 and the second heat roll 114 or only the second heat roll 114 are heated to a predetermined temperature. Thereby, in the joining parts 31 and 32 located on the convex part 11a in the first roll 111, the material constituting the first sheet 1 and the second sheet 2, for example, the thermoplastic resin is melted, and the joining parts 31 to 31 are melted. 33 is formed more firmly. In this way, the target composite sheet 10 is continuously manufactured.

  In the manufacture of the composite sheet 10 described above, the first roll 111 and the second roll 112 have a central region forming portion that forms the above-described central region M in the composite sheet 10 at the central portion in the axial length direction, The composite sheet 10 provided with the side region forming portions for forming the side regions S, S described above is used on both sides of the central portion in the axial direction.

The first roll 111 and the second roll 112 are a combination of a plurality of types of gears and spacers having different tooth formation patterns in the circumferential direction, which are concentrically attached to the shaft core and accumulated in a roll shape. The first roll 111 and the second roll 112 have different gear tooth pitches, gear combinations, spacer arrangements, and the like between the central region forming portion and the side region forming portion.
FIG. 14 shows a state in which the convex portion of the second roll 112 meshes with the peripheral surface of the central region forming portion of the first roll 111 in a flat state, and FIG. 15 shows the first roll. A state where the convex portion of the second roll 112 is engaged with the peripheral surface of the side region forming portion 111 is shown in a flat state. 14 and 15, the direction indicated by the arrow U is the rotation direction of the first roll 111 and the second roll 112, and the direction indicated by the arrow V is the axial direction of the first roll 111 and the second roll 112. Further, in FIG. 14 and FIG. 15, the rectangular or square area indicated by fine dots indicates the tooth tip surface of the gear in the first roll 111, and the area indicated by coarse dots is indicated by the second roll. The tooth-tip surface of the gear in 112 is shown.

  In the shaping process of unevenly shaping the first sheet 1 described above, the first sheet 1 is formed in the recess formed on the peripheral surface of the first roll 111 in each of the central region forming part and the side region forming part. The three-dimensional shaping corresponding to the convex portions of the central region M and the side regions S and S is performed by being pushed in by the tooth tip surfaces of the gears of the first roll 111. Then, the target composite sheet 10 is obtained by bonding the second sheet 2 to the first sheet 1 subjected to the three-dimensional shaping. The composite sheet 10 obtained as described above is introduced into the production line of the diaper 100, and is used as the top sheet 12 of the disposable diaper 100 by a known method. When the first sheet 1 is deformed into a concavo-convex shape by being engaged with the meshing portion of the first roll 111 and the second roll 112, the first sheet 1 is sucked toward the inner direction of the first roll. It is preferable to promote the deformation of the first sheet 1 into the uneven shape.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, as the surface sheet of the absorbent article, the first joint portion 31 and the second joint portion 32 in the central region M of the composite sheet 10 described above have the same width in the second direction Y and are spaced in the second direction Y. They may be opened alternately and arranged at equal intervals.

Further, the elastic member 19 for contracting the absorbent article in the width direction of the article, which is the width direction thereof, is only in the central portion of the back side in the width direction, for example, only in the rectangular frame shown as the elastic member arrangement region in FIG. It may be arranged. Further, the number of elastic members arranged in the elastic member arrangement region BM may be only two.
In addition, as an elastic member for contracting the absorbent article in the longitudinal direction of the article, which is the longitudinal direction, only one of the elastic member 15a that forms a three-dimensional gather and the elastic member 16 that forms a leg gather may be provided. . In addition, the elastic member 15a that forms the three-dimensional gather and the elastic member 16 that forms the leg gather may be arranged one by one on the left and right sides of the absorbent article, respectively, or may be arranged by a plurality. good. Moreover, the elastic member which shrinks an absorbent article in the longitudinal direction of the article, which is its longitudinal direction, may not be arranged.

  The absorbent article of the present invention may be a pants-type (pull-on-type) disposable diaper instead of the unfolded disposable diaper. It may be an incontinence pad, a panty liner or the like.

This invention discloses the following absorbent articles further regarding embodiment mentioned above.
<1>
An absorbent article comprising a top sheet made of a composite sheet, a back sheet, and an absorbent body disposed between the two sheets,
The composite sheet has a first direction along the article longitudinal direction and a second direction along the article width direction, and the laminated first sheet and second sheet are partially joined to form a plurality of joints. The first sheet protrudes in a direction away from the second sheet at a portion other than the joint portion, and forms a convex portion protruding toward the wearer's skin side,
The composite sheet has a central region in which the convex portions are formed in different patterns and a pair of side regions located on both sides of the central region,
The central first convex portion that is the largest convex portion in the central region has a higher height than the side first convex portion that is the largest convex portion in the side region,
The absorbent article in which the amount of compressive deformation in the central region is larger than the amount of compressive deformation in the side region.

<2>
A plurality of central continuous convex portions including the central first convex portion are formed in the central region, and the convex portions are formed in a dotted shape in the side region, The absorbent article as described in <1>.
<3>
In the central region, a plurality of central continuous convex portions are formed,
In the central continuous convex portion, the central first convex portion and the central second convex portion whose height is lower than the central first convex portion are alternately connected, or only the central first convex portion is plural. The absorbent article according to <1> or <2>, which is continuous.
<4>
Each of the central continuous protrusions extends along the second direction,
The first side protrusions in the side region are parallel to each other in the composite sheet in the side region and have a plurality of first virtual straight lines parallel to each other and an angle between the first virtual straight lines. Absorption according to the above <2> or <3>, which is located at each intersection of the first virtual line and the second virtual line when a plurality of second virtual lines are assumed. Sex goods.
<5>
A central third convex portion having a height lower than that of the central first convex portion is formed in the central region,
The central third convex portions are positioned in the first direction between the central first convex portions, and the height thereof is equal to the height of the side first convex portions. <1> to < The absorbent article according to any one of 4>.

<6>
A central third convex portion having a height lower than that of the central first convex portion is formed in the central region,
A plurality of the central third convex portions are formed along the second direction, and a vertically long joint portion having a long shape in the first direction is formed between adjacent central third convex portions in the second direction. The absorbent article according to any one of <1> to <5>.
<7>
The height of the central first protrusion is preferably 105% or more, more preferably 110% or more, and preferably 200% or less, more preferably 150, with respect to the height of the side first protrusion. % Of the absorbent article according to any one of <1> to <6>.
<8>
The height of the central first convex portion is preferably 0.5 mm or more, more preferably 1 mm or more, preferably 5 mm or less, more preferably 4 mm or less, any one of <1> to <7> Or an absorbent article according to claim 1.
<9>
<1> to <8> The height of the first side convex portion is preferably 0.3 mm or more, more preferably 0.6 mm or more, and preferably 4 mm or less, more preferably 3 mm or less. The absorbent article according to any one of 1.

<10>
The difference between the height of the central first convex portion and the height of the side first convex portion is preferably 0.1 mm or more, more preferably 0.2 mm or more, and preferably 2 mm or less, more preferably 1 mm or less. The absorbent article according to any one of <1> to <9>, wherein
<11>
In the central region, a plurality of central continuous convex portions are formed,
The central first convex part constituting the central continuous convex part and the central second convex part having a lower height than the central first convex part have a cavity at least on the back side of the central first convex part 41. The absorbent article according to any one of <1> to <10>, which is preferable.
<12>
In the central region, a plurality of central continuous convex portions are formed,
There is a cavity on the back side of each of the central first convex portion and the central second convex portion that is lower than the central first convex portion constituting the central continuous convex portion, and the back surface of the central first convex portion And a cavity on the back surface of the central second convex part, and a continuous hollow part extending continuously in the second direction is formed on the back side of the central continuous convex part. The absorbent article according to any one of> to <11>.
<13>
A first joint section along the second direction is formed by a first joint section having a long side that coincides with the first direction and has a rectangular shape arranged in a line at intervals along the second direction. The absorbent article according to any one of <1> to <12>.
<14>
One side of two sides orthogonal to each other coincides with the second direction, the other side coincides with the first direction, and the second joints are arranged in a row at intervals along the second direction, thereby causing the second direction. The absorbent article according to any one of <1> to <13>, in which a second joint row along the line is formed.

<15>
The first joint portion along the second direction is formed by the first joint portions having the long sides coinciding with the first direction and having a rectangular shape arranged in a row at intervals along the second direction. And
One side of two sides orthogonal to each other coincides with the second direction, the other side coincides with the first direction, and the second joints are arranged in a row at intervals along the second direction, thereby causing the second direction. A second joint row R2 is formed along
In each first joint row, the arrangement interval of the first joint portions in the second direction is constant, and in each second joint row, the arrangement interval of the second joint portions in the second direction is 2 The absorbent article according to any one of <1> to <14>, wherein the absorbent article has various types of intervals, and alternately includes wide intervals and narrow intervals.
<16>
The first joint portion along the second direction is formed by the first joint portions having the long sides coinciding with the first direction and having a rectangular shape arranged in a row at intervals along the second direction. And
One side of two sides orthogonal to each other coincides with the second direction, the other side coincides with the first direction, and the second joints are arranged in a row at intervals along the second direction, thereby causing the second direction. A second joint row R2 is formed along
In each of the first joint rows, the arrangement positions of the first joints when viewed along the second direction are all the same, and each second joint row is also in the second direction. The absorbent article according to any one of <1> to <15>, wherein the arrangement positions of the second joints when viewed along the line are all the same.
<17>
The first joint portion along the second direction is formed by the first joint portions having the long sides coinciding with the first direction and having a rectangular shape arranged in a row at intervals along the second direction. And
One side of two sides orthogonal to each other coincides with the second direction, the other side coincides with the first direction, and the second joints are arranged in a row at intervals along the second direction, thereby causing the second direction. A second joint row R2 is formed along
When attention is paid to one of the first joints constituting the first joint row, a total of four second joints constituting two second joint rows are around the first joint, The absorbent article according to any one of <1> to <16>, wherein the absorbent article is disposed adjacent to each of the four corners of the first joint so as to face each other.
<18>
The first joint portion along the second direction is formed by the first joint portions having the long sides coinciding with the first direction and having a rectangular shape arranged in a row at intervals along the second direction. And
One side of two sides orthogonal to each other coincides with the second direction, the other side coincides with the first direction, and the second joints are arranged in a row at intervals along the second direction, thereby causing the second direction. A second joint row R2 is formed along
A group of joints composed of one first joint and four second joints located around the first joint is formed. In each embossed region E, a similar joint group is The absorbent article according to any one of the above items <1> to <17>, wherein a plurality of the articles are formed at constant intervals along two directions.
<19>
When attention is paid to the fourth convex portion in addition to the central second convex portion and the central third convex portion which are lower than the central first convex portion, these three types of convex portions are the central second convex portion and the central second convex portion. The <1> to <18, wherein the fourth convex portion, the central third convex portion, and the fourth convex portion are arranged in this order regularly and linearly along the first direction. > Any one of>.

<20>
The central region of the composite sheet includes the central first convex portion, the central second convex portion having a height lower than the central first convex portion, the central third convex portion, and the first sheet constituting the central sheet. A fourth convex portion is formed, and the fourth convex portion has a height lower than any of the central first convex portion, the central second convex portion, and the central third convex portion, The absorbent article according to any one of <1> to <19>.
<21>
In the side region of the composite sheet, a plurality of second direction joint rows in which the third joint portions are regularly arranged at two kinds of intervals along the second direction are formed in the first direction. The absorbent article according to any one of <1> to <20>.
<22>
The second direction joint line has a first distance and a second distance wider than the first distance as a distance between the third joints in the second direction. The absorption according to <21>, wherein the plurality of third joints in the two-way joint row are intermittently arranged in the second direction so as to have these two kinds of intervals alternately in the second direction. Sex goods.
<23>
The plurality of third joints constituting each of the second direction joint rows have the same length and arrangement position in the first direction, and are adjacent between the second direction joint rows adjacent in the first direction. The absorbent article according to <21> or <22>, in which a gap having a certain width is formed.
<24>
In the second direction joint line formed in a plurality of rows in the first direction, the arrangement positions of the third joints in the second direction coincide with each other, and the second direction joint lines adjacent to each other. The absorbent article according to any one of <21> to <23>, wherein the arrangement positions of the third joint portions in the second direction are different from each other.

<25>
As the second direction joint row, second direction first joint rows and second direction second joint rows in which the arrangement positions of the third joints in the second direction are different from each other alternately in the first direction. With respect to the arrangement position of the third joint portion in the second direction, the second direction first joint row and the second direction second joint row are adjacent to each other at the second interval on one side. The absorption according to any one of <21> to <24>, wherein a pair of the third joints adjacent to each other at a first interval in the other joint row is located between the third joints. Sex goods.
<26>
The composite sheet in the side region is assumed to be a plurality of first virtual lines parallel to each other and a plurality of second virtual lines parallel to each other having an angle between the first virtual lines. sometimes,
The angle θ formed by the first imaginary straight line and the second imaginary straight line is preferably 30 ° or more and 165 ° or less, more preferably 45 ° or more and 150 ° or less, and any one of <1> to <25> 2. The absorbent article according to 1.
<27>
The composite sheet in the side region is assumed to be a plurality of first virtual lines parallel to each other and a plurality of second virtual lines parallel to each other having an angle between the first virtual lines. sometimes,
In the side region of the composite sheet, a plurality of third first convex portions arranged in series along the first imaginary straight line with a plurality of side first convex portions at regular intervals, and a plurality of the side portions Any one of <1> to <26>, wherein the first convex portions are formed with a plurality of fourth direction convex portion rows arranged in series along the second imaginary straight line at regular intervals. Absorbent article as described in 1.
<28>
Between the adjacent third direction convex part rows, a third direction joint part row in which a plurality of joint pairs are arranged in series at a constant interval is formed, and between the adjacent fourth direction convex part rows. The absorbent article according to the above <27>, wherein a fourth direction joint row in which a plurality of joint pairs are arranged in series at a constant interval is formed.
<29>
The height of the minute convex portion is the absorbent article according to any one of <1> to <28>, which is 1/3 or less of the first side convex portion.

<30>
Disposable diaper having an abdominal side portion disposed on the stomach side of the wearer when worn, a back side portion disposed on the back side of the wearer when worn, and a crotch portion positioned between the abdominal side portion and the back side portion And
A plurality of elastic members for shrinking the disposable diaper in the width direction are disposed at least in the center in the width direction of the dorsal side portion at intervals in the longitudinal direction of the disposable diaper,
The central region of the composite sheet is arranged in an elastic member arrangement region in which the plurality of elastic members are arranged, and the elastic member arrangement region includes the central first convex portion. The protrusions are each formed in a plurality of rows extending in the second direction,
When the width of the central continuous convex portion is P1, the interval between the elastic members is P2, and the interval between the central portions of the central continuous convex portion is P3, the relationship of P1 <P2 <P3 is satisfied. The absorbent article according to any one of> to <29>.
<31>
In the central region, a plurality of central continuous convex portions are formed,
Any one of the above items <1> to <30>, wherein vertically long joints having a shape elongated in the first direction are formed at equal intervals in the second direction between the central continuous convex portions adjacent in the first direction. Absorbent article <32> according to 1
The length of the first joint portion 31 that is a vertically long joint portion is preferably 1.2 times or more, particularly 1.5 times or more of the length along the second direction, and 5 times the length along the second direction. The absorbent article according to <31>, preferably not more than twice, particularly preferably not more than 3 times.
<33>
The first joint portion 31 that is a vertically long joint portion has a length along the first direction that is 1.2 times or more, particularly 1.5 times or more the length along the first direction of the second joint portion. The absorbent article according to <31> or <32>, preferably 5 times or less, particularly preferably 3 times or less.
<34>
The length along the first direction of the first joint which is a vertically long joint is preferably 0.5 mm or more, particularly preferably 1 mm or more, and is preferably 10 mm or less, particularly preferably 5 mm or less, <31> The absorbent article according to any one of ~ <33>.

<35>
The second joints arranged in a line at intervals along the second direction with one side of the two sides orthogonal to each other aligned in the second direction and the other side in the first direction are arranged in the first direction. The length along the second direction is preferably 0.1 mm to 5 mm, particularly 0.5 mm to 3 mm, and the length along the second direction is 0.1 mm to 5 mm, particularly 0.5 mm to 3 mm. The absorbent article according to any one of <1> to <34>, which is preferably present.
<36>
The length of the third joint formed in the side region of the composite sheet along the first direction is preferably 0.1 mm or more and 5 mm or less, particularly preferably 0.5 mm or more and 3 mm or less, and in the second direction. The absorbent article according to any one of <1> to <35>, wherein the length along the length is preferably 0.1 mm to 5 mm, particularly preferably 0.5 mm to 3 mm.
<37>
The second direction joint line in which the third joints are regularly arranged at two kinds of intervals along the second direction has a gap between portions where the distance between the third joints in the second direction is large. It is preferably 2 times or more, particularly 2.5 times or more, and preferably 5 times or less, particularly preferably 4 times or less, with respect to the space between the third joints in the narrow space portion, <36 The absorbent article as described in>.
<38>
In the composite sheet, the surface on the second sheet side is substantially flat in both the central region and the side region, and irregularities having large undulations are formed on the first sheet side, <1> The absorbent article according to any one of ~ <37>.
<39>
Each of the central first convex portion and the central second convex portion constituting the central continuous convex portion formed in the central region has a substantially circular shape in plan view, <1> to < The absorbent article according to any one of 38>.
<40>
In the central region of the composite sheet, a non-embossed region that extends in the second direction and does not have a joint portion continuously in the second direction, and extends in the second direction, the joint portions are regular. The absorbent article according to any one of <1> to <39>, wherein the embossed regions formed in a pattern are alternately formed in the first direction.

100 disposable diapers (absorbent articles)
12 surface sheet 10 composite sheet 1 first sheet 2 second sheet M central region 40 central continuous convex portion 41 central first convex portion (convex portion)
42 Central second convex part (convex part)
43 Center third convex part (convex part)
S side region 41 ′ side first convex portion (convex portion)
31 1st joint part (vertically long joint part)
32 2nd junction part 33 3rd junction part 13 Back surface sheet 14 Absorber 15 Sheet | seat 19 for solid gather formation Elastic member

Claims (9)

An absorbent article comprising a top sheet made of a composite sheet, a back sheet, and an absorbent body disposed between the two sheets,
The composite sheet has a first direction along the article longitudinal direction and a second direction along the article width direction, and the laminated first sheet and second sheet are partially joined to form a plurality of joints. The first sheet protrudes in a direction away from the second sheet at a portion other than the joint portion, and forms a convex portion protruding toward the wearer's skin side,
The composite sheet has a central region in which the convex portions are formed in different patterns and a pair of side regions located on both sides of the central region,
The central first convex portion that is the largest convex portion in the central region has a higher height than the side first convex portion that is the largest convex portion in the side region,
The amount of compressive deformation of the central region, much larger than the amount of compressive deformation of the side regions,
A first joint section along the second direction is formed by a first joint section having a long side that coincides with the first direction and has a rectangular shape arranged in a line at intervals along the second direction. and is, the absorbent article. An absorbent article comprising a top sheet made of a composite sheet, a back sheet, and an absorbent body disposed between the two sheets,
The composite sheet has a first direction along the article longitudinal direction and a second direction along the article width direction, and the laminated first sheet and second sheet are partially joined to form a plurality of joints. The first sheet protrudes in a direction away from the second sheet at a portion other than the joint portion, and forms a convex portion protruding toward the wearer's skin side,
The composite sheet has a central region in which the convex portions are formed in different patterns and a pair of side regions located on both sides of the central region,
The central first convex portion that is the largest convex portion in the central region has a higher height than the side first convex portion that is the largest convex portion in the side region,
The amount of compressive deformation of the central region is larger than the amount of compressive deformation of the side region ,
In the side region of the composite sheet, a plurality of second direction joint rows in which the third joint portions are regularly arranged at two kinds of intervals along the second direction are formed in the first direction. , Absorbent articles.
A plurality of central continuous convex portions including the central first convex portion are formed in the central region, and the convex portions are formed in a dotted pattern in the side region. Item 3. An absorbent article according to item 1 or 2 . In the central region, a plurality of central continuous convex portions are formed,
In the central continuous convex portion, the central first convex portion and the central second convex portion whose height is lower than the central first convex portion are alternately connected, or only the central first convex portion is plural. The absorbent article according to any one of claims 1 to 3 , which is continuous. The central continuous protrusions extend in the second direction, respectively, and the first side protrusions in the side region are a plurality of first virtual straight lines parallel to each other on the composite sheet in the side region. And a plurality of second virtual straight lines parallel to each other having an angle between the first virtual straight line and the first virtual straight line, the position is at each intersection of the first virtual straight line and the second virtual straight line. The absorbent article according to claim 3 or 4 . A central third convex portion having a height lower than that of the central first convex portion is formed in the central region, and the central third convex portion has an arrangement position in the first direction between the central first convex portions. The absorbent article according to any one of claims 1 to 5 , wherein the absorbent article is located between the central third convex portion and has a height equal to that of the side first convex portion. A plurality of the central third convex portions are formed along the second direction, and a vertically long joint portion having a shape that is long in the first direction is formed between the central third convex portions adjacent in the second direction. The absorbent article according to claim 6 . Disposable diaper having an abdominal side portion disposed on the stomach side of the wearer when worn, a back side portion disposed on the back side of the wearer when worn, and a crotch portion positioned between the abdominal side portion and the back side portion And
A plurality of elastic members for shrinking the disposable diaper in the width direction are disposed at least in the widthwise central portion of the dorsal side portion, with a spacing in the longitudinal direction of the disposable diaper,
The central region of the composite sheet is arranged in an elastic member arrangement region in which the plurality of elastic members are arranged, and the elastic member arrangement region includes the central first convex portion. The protrusions are each formed in a plurality of rows extending in the second direction,
The relationship of P1 <P2 <P3 is satisfied, where P1 is a width of the central continuous convex portion, P2 is an interval between the elastic members, and P3 is an interval between central portions of the central continuous convex portion. The absorbent article of any one of -7. The absorptive article according to claim 8 in which vertically long joints having a shape long in the first direction are formed at equal intervals in the second direction between the central continuous convex portions adjacent in the first direction.

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