TWI519281B - Absorbent items - Google Patents

Description

Absorbent article

The invention relates to an absorbent article such as a menstrual sanitary napkin, a sanitary pad (vaginal secretion pad), an incontinence pad and the like.

Conventionally, it has been known that an absorbent body in an absorbent article such as a menstrual sanitary napkin is provided with a bulging portion in such a manner as to conform to the uneven shape of the wearer's skin, and it is also known that the bulging portion forms a groove. For example, Patent Documents 1 and 2 disclose an absorber including a ridge having a groove in the vicinity of a central portion of the absorbent body.

Prior technical literature Patent literature

Patent Document 1: Japanese Patent Laid-Open Publication No. 2009-112590

Patent Document 2: Japanese Patent Laid-Open Publication No. 2012-125366

The absorbent body of Patent Document 1 has a laminated structure of an upper layer and a lower layer, and a central portion of the upper layer where the ridge portion is formed is formed with a recess extending through the upper and lower layers. However, the recess is formed by hot embossing, and the vicinity of the bottom of the recess is densified, so that the liquid is difficult to diffuse to other portions from the bottom of the recess, and the property of preventing moisture or the absorber is There is room for improvement in terms of effective utilization of the absorption capacity.

Further, Patent Document 2 discloses that an absorbing body including a plurality of block-shaped convex portions is similarly provided with a ridge portion including a plurality of convex portions. However, there is no suggestion that the depth of the groove between the block-shaped convex portions formed in the ridge portion is such that the surface of the portion other than the ridge portion reaches the depth below.

Accordingly, it is an object of the present invention to provide an absorbent article which eliminates the disadvantages of the prior art described above.

The present invention relates to an absorbent article comprising an absorbent core of a shape that is long in the direction of the front and rear of the absorbent article. The absorptive core includes a central region and lateral regions on both sides thereof in the width direction thereof, and the central region includes protrusions that protrude upward from the upper surfaces of the respective lateral regions. The absorbent core system integrally forms the central region and the lateral region. A plurality of lateral grooves along the width direction of the absorbent core are continuously formed from the central region over the lateral region on the skin abutting surface of the absorbent core. The lateral groove is formed by lowering the basis weight of the material for forming the absorbent core, and the bottom portion of the lateral groove adjacent to the lateral region is located below the upper surface of the lateral region.

1‧‧‧Periodical cotton

2‧‧‧Skin side sheet

2a‧‧‧Surface sheet

2b‧‧‧Three-dimensional shield forming sheet

3‧‧‧Non-skin side sheet

4‧‧‧Absorbent core

4'‧‧‧ Deposits

4A‧‧‧Absorbent core

4B‧‧‧Absorbent core

5‧‧‧Protruding

6‧‧‧Absorbable ontology

7‧‧‧Flanking

8‧‧‧ rear wing

11‧‧‧Uplift

21‧‧‧ Side edge

41‧‧‧Central area

41M‧‧‧Central Department

41S‧‧‧Slanted side

42‧‧‧High base

42'‧‧‧ Deposits

42d‧‧‧Parts

Section 42u‧‧‧

43‧‧‧Low basis weight

43'‧‧‧ Deposits

44‧‧‧ transverse slot

44a‧‧‧ transverse slot

44b‧‧‧ transverse slot

44d‧‧‧ bottom

45‧‧‧Side area

45S‧‧‧Slanted side

46‧‧‧High base

47‧‧‧Low basis weight

48‧‧‧Low basis weight

49‧‧‧Low basis weight

50, 51, 52‧‧‧ longitudinal slots

53‧‧‧ transverse slot

54‧‧‧Fiber

55‧‧‧Concave recess

56‧‧‧ bottom

56a‧‧‧ recess

A‧‧‧ front section

B‧‧‧The Department of Liquid Excretion

C‧‧‧ Rear

P1‧‧‧ parts

S2‧‧‧ upper surface

T‧‧‧ Height

T1‧‧‧ thickness

T2‧‧‧ thickness

W‧‧‧Width

W1‧‧‧Width

W2‧‧‧Width

X‧‧‧ direction

Y‧‧‧ direction

Fig. 1 is a perspective view showing a menstrual napkin as a first embodiment of the present invention.

2(a) is a cross-sectional view taken along line IIa-IIa of Fig. 1, and Fig. 2(b) is a cross-sectional view taken along line IIb-IIb of Fig. 1.

3(a) is a sectional view taken along line IIIa-IIIa of FIG. 1, and FIG. 3(b) is a sectional view taken along line IIIb-IIIb of FIG. 1.

Fig. 4 is a schematic view showing a state of deformation of the absorbent core in the wearing state of the menstrual napkin of Fig. 1.

Fig. 5 (a) and Fig. 5 (b) are schematic views showing a cross section in the circumferential direction of the fiber bundle cylinder which is preferably used in the manufacture of the absorbent core of the menstrual sanitary napkin shown in Fig. 1.

Fig. 6 is a perspective view showing a menstrual sanitary napkin as a second embodiment of the present invention.

Fig. 7(a) is a sectional view taken along line VIIa-VIIa of Fig. 6, and Fig. 7(b) is a sectional view taken along line VIIb-VIIb of Fig. 6.

Fig. 8 is a plan view showing a menstrual napkin as a third embodiment of the present invention.

Figure 9 (a) is a cross-sectional view taken along line IXa-IXa of Figure 8, and Figure 9 (b) is a cross-sectional view taken along line IXb-IXb of Figure 8. Figure.

Hereinafter, the present invention will be described with reference to the drawings based on preferred embodiments of the present invention.

The menstrual sanitary napkin 1 (hereinafter also referred to simply as the sanitary napkin 1) according to the first embodiment of the absorbent article of the present invention is a night sanitary napkin suitable for use at bedtime.

As shown in Fig. 1, the sanitary napkin 1 includes an absorbent body 6, a pair of side flap portions 7, 7 and a pair of rear wing portions 8, 8 which are long in the front-rear direction. In the case of absorbent articles such as menstrual napkins, the term "front and rear direction" refers to the direction in which the wearer is in the same direction as the wearer.

The absorbent body 6 includes a front portion A, a liquid discharge portion opposing portion B, and a rear portion C in the longitudinal direction thereof, and includes a pair of side wing portions 7 and 7 on the left and right sides of the liquid discharge portion opposing portion B at the rear portion C. The left and right sides include a pair of rear wing portions 8, 8. The liquid discharge portion facing portion B is disposed at a portion where the center portion in the width direction is opposed to the liquid discharge portion (vaginal opening) of the wearer, and the front portion A is disposed before the liquid discharge portion facing portion B before the wearer The portion on the side (ventral side) and the rear portion C are disposed on the back side of the wearer's opposite portion B from the liquid discharge portion.

The sanitary napkin 1 includes a skin side sheet 2 that forms a skin abutting surface toward the wearer's skin side when worn, and a non-skin side sheet 3 that forms a non-skin abutting surface toward the garment side such as a pair of shorts when worn; And an absorbent core 4 disposed between the two sheets 2, 3. The skin side sheet 2 includes a liquid permeable surface sheet 2a and a pair of three-dimensional shield forming sheets 2b and 2b joined to both sides thereof. The liquid permeable surface sheet 2a is disposed in the central portion of the absorbent body 6 in the width direction so as to extend over the entire length of the absorbent body 6. The sheet 2b for forming the three-dimensional shield is placed on the surface sheet 2a in a state in which the side edge portion 21 on the center side in the width direction of the absorbent main body is superposed on the outer side in the width direction from the side edge portion 21, and The surface sheet 2a is joined. The sheet 3b for forming a three-dimensional shield is in the vicinity of the side edge portion 21 An elastic member (not shown) for forming a three-dimensional shield, which is self-surfaced from a portion of the opposite portion B of the liquid discharge portion away from the specific width portion by the contraction force of the elastic member when worn. The sheet 2a rises away from it to form a three-dimensional shield.

The pair of side flap portions 7 and 7 and the pair of rear wing portions 8 and 8 include a sheet for forming a three-dimensional shield forming sheet 2b and a non-skin side sheet 3 extending from both side edges of the absorbent core 4. A side flap adhesive portion (not shown) for fixing the non-skin contact surface of the crotch portion of the shorts is provided on the surface of each of the pair of side flap portions 7 including the non-skin side sheet 3, and is disposed on the absorbent body 6 The non-skin contact surface is provided with a body adhesive portion (not shown) for fixing the main body 6 to the inner surface of the shorts. The rear wing portion 8 is placed on the inner surface (skin contact surface) of the shorts when worn. Preferably, the surface of the rear wing portion 8 including the non-skin side sheet 3 is also provided with an adhesive portion for fixing to the inner surface of the shorts. The skin side sheet 2 and the non-skin side sheet 3 are joined to each other by the outer peripheral edge portion of the absorbent core 4 by an adhesive, and are joined by heat sealing at the peripheral portion of the napkin 1 . Preferably, between the skin-side sheet 2 and the absorbent core 4, and between the absorbent core 4 and the non-skin-side sheet 3, an adhesive is applied by patterning such as dots, spirals, and stripes. Engage each other.

The absorbent core 4 in the sanitary napkin 1 includes a fiber aggregate including a fiber material such as pulp fibers or a polymer which maintains a highly water-absorptive polymer between the fibers of the fiber assembly. The absorbent core 4 is covered with both upper and lower surfaces by a core material (not shown) including a toilet paper or a water-permeable nonwoven fabric. The packaged chip material is used for the purpose of preventing leakage of the formation material of the absorbent core or improving the shape retention of the absorbent core.

As shown in Fig. 1, the absorbent core 4 in the sanitary napkin 1 has a shape that is long in the same direction as the front and rear directions of the sanitary napkin 1. Further, as shown in Figs. 2(a) and 2(b), the absorbent core 4 includes a central portion 41 and lateral regions 45, 45 on both sides thereof in the width direction Y, and the central portion 41 includes The protrusions 5 projecting upward from the upper surfaces S2 and S2 of the side regions 45 and 45, respectively.

The sanitary napkin 1 is by the presence of the protrusion 5 of the absorbent core 4 under the surface sheet 2a. A raised portion 11 that protrudes toward the skin side of the wearer is formed at a central portion in the width direction of the skin contact surface.

Further, the ratio of the width W1 of the protruding portion 5 (see Fig. 2(a)) to the entire width W2 of the absorbent core is preferably 20% or more, more preferably 30% or more, and still more preferably 80% or less. More preferably, it is 70% or less, and further preferably 20% or more and 80% or less, more preferably 30% or more and 70% or less.

As shown in Fig. 1, the protruding portion 5 of the absorbent core 4 in the sanitary napkin 1 and the raised portion 11 formed by the protruding portion 5 have a shape elongated in the longitudinal direction of the absorbent core, and The liquid discharge portion facing portion B of the sanitary napkin 1 is formed over one portion of the rear portion C. More specifically, it is formed in a range from the vicinity of the front end portion of the liquid discharge portion facing portion B to the rear portion of the rear portion C in the X-direction central portion.

The protruding portion 5 and the raised portion 11 are preferably formed in the front and rear direction X of the sanitary napkin 1 (absorbent article) from the liquid discharge portion facing portion B over one of the rear portions C. Further, the protruding portion 5 and the raised portion 11 are preferably formed over a length of 30% or more of the entire length of the front and rear directions X of the sanitary napkin 1, and more preferably formed over a length of 40% or more of the entire length of the sanitary napkin 1 and further It is preferably formed over a length of 50% or more of the entire length of the sanitary napkin 1.

As shown in Fig. 3(a), in the central region 41 of the absorbent core 4, a high basis weight portion 42 and a low base forming the bottom portion of the lateral groove 44 are alternately formed in the longitudinal direction X of the absorbent core 4. The weight portion 43 and each of the low basis weight portions 43 extend along the width direction Y of the absorbent core 4. The high basis weight portion 42 is a portion having a relatively higher basis weight of the material for forming the absorbent core than the low basis weight portion 43, and the low basis weight portion 43 is the basis weight and high basis weight of the material for forming the absorbent core body. The portion 42 is relatively lower than the basis weight.

The central region 41 of the absorbent core 4 is pressed in the step of manufacturing the absorbent core 4. At this time, the pressure due to the pressing is concentrated on the thick base portion 42 having a relatively large thickness, and the low basis weight portion 43 having a small thickness is not compressed by the pressure due to the pressing. Thus, the high basis weight portion 42 is increased in absorption relative to the low basis weight portion 43 by compressing only the high basis weight portion 42. The design of the density of the components.

The lateral region 45 of the absorbent core 4 is pressed in a different step than the step of pressing the central region 41. The pressure due to the pressing is concentrated on the thick base portion 46 having a relatively large thickness, and the low basis weight portion 47 having a small thickness is not compressed by the pressure due to the pressing. Thus, the high basis weight portion 46 is designed to increase the density of the absorbing member with respect to the low basis weight portion 47 by compressing only the high basis weight portion 46. Further, the pressing step used in this step is designed in such a manner that a press roll which is cut into a shape corresponding to the central portion 41 or only a side region corresponding to the absorbent core 4 is used. In the portion of 45, there are measures such as a roll of the pressing portion to press only the side regions of the absorbent core 4.

In the central region 41 of the absorbent core 4, the ratio of the basis weight of the low basis weight portion 43 forming the bottom of the lateral groove 44 to the basis weight of the high basis weight portion 42 is preferably 5% or more, more preferably 10 % or more, more preferably 50% or less, more preferably 40% or less, further preferably 5% or more and 80% or less, more preferably 10% or more and 70% or less, and still more preferably 10% or more. Further, it is 50% or less, and more preferably 10% or more and 40% or less. Further, the basis weight of the high basis weight portion 42 is preferably 200 g/m ² or more, more preferably 300 g/m ² or more, further preferably 800 g/m ² or less, more preferably 700 g/m ² or less. It is preferably 200 g/m ² or more and 800 g/m ² or less, more preferably 300 g/m ² or more and 700 g/m ² or less. The basis weight of the low basis weight portion 43 is preferably 10 g/m ² or more, more preferably 15 g/m ² or more, further preferably 400 g/m ² or less, more preferably 350 g/m ² or less, and further preferably It is 10 g/m ² or more and 400 g/m ² or less, more preferably 15 g/m ² or more and 350 g/m ² or less, further preferably 25 g/m ² or more and 300 g/m ² or less.

The high basis weight portion 42 has a larger base weight and a larger thickness than the low basis weight portion 43 forming the bottom of the lateral groove 44. The ratio of the thickness of the low basis weight portion 43 to the thickness of the high basis weight portion 42 is preferably 5% or more, more preferably 10% or more, further preferably 50% or less, more preferably 40% or less, and It is preferably 5% or more and 50% or less, more preferably 10% or more and 40% or less. Further, the thickness of the high basis weight portion 42 is preferably 1.5 mm or more, more preferably 2 mm or more, further preferably 10 mm or less, more preferably 8 mm or less, and further preferably 1.5 mm or more. 10 mm or less, more preferably 2 mm or more and 8 mm or less. The thickness of the low basis weight portion 43 is preferably 0.08 mm or more, more preferably 0.15 mm or more, further preferably 5 mm or less, more preferably 4 mm or less, further preferably 0.08 mm or more and 5 mm or less, more preferably 0.15 mm or more and 4 mm or less.

Further, in the case where the value of the high basis weight portion 42 or the relationship with the low basis weight portion 43 is such that the sanitary napkin 1 of the present embodiment includes a vertical groove to constitute an absorbent core, It is sufficient to meet the high basis weight that does not include the longitudinal groove 50.

[Method for measuring basis weight of high basis weight and low basis weight]

Using a single-edged razor manufactured by FEATHER Co., the absorbent core is cut along the boundary line between the high basis weight portion 42 and the low basis weight portion 43 to obtain a high basis weight portion 42 and a low basis weight in such a manner as to have a predetermined area. A small piece of the department 43. The high basis weight portion 42 cuts off a portion sandwiched between the pair of low basis weight portions 43, 43 as a small piece. That is, the high basis weight portion 42 is cut as a block piece divided by the low basis weight portion 43. In the case where the small piece includes the low basis weight portion 48 formed at the bottom of the longitudinal grooves 50, 51, 52 extending in the longitudinal direction, the high basis weight portion 42 divided by the low basis weight portion 43 and the low basis weight portion 48 is used as a test. The sections were cut and used for the assay. The small piece of the low basis weight cuts a narrow portion sandwiched between the pair of high basis weight portions 42, 42 as a small piece in such a manner that the length becomes 30 mm.

The weight of the small pieces was measured using an electronic balance (electronic balance GR-300 manufactured by A&D, precision: 4 digits after the decimal point). The basis weight of the small piece is calculated by dividing the obtained weight by the area of the small piece of the high basis weight portion 42 or the low basis weight portion 43. Regarding each of the high basis weight portion 42 and the low basis weight portion 43, the average basis weight of the five small pieces is set as the basis weight.

[Method for measuring the thickness of high base weight and low basis weight]

The measurement of the thickness of the high basis weight portion 42 and the low basis weight portion 43 is performed by measuring the thickness of the small piece cut to measure the basis weight of each portion. The measurement unit of the high basis weight portion 42 and the small base portion of the low basis weight portion 43 cut from the absorbent article was pressurized at a pressure of 5 kPa for 10 minutes, and immediately after the weight removal. In the central area of the sample after weight removal, size 20 An acrylic plate of mmX 20 mm and a thickness of 3 mm was placed on the absorber 3, and the thickness of the sample was measured using a non-contact laser displacement meter (laser head LK-G30, displacement meter LK-GD500) manufactured by KEYENCE. When the size of the cut piece is small and it is difficult to measure by a non-contact type laser displacement meter, for example, a microscope (VHX-1000 manufactured by KEYENCE Corporation) can be used to observe at a magnification of 20 to 100 times. The cross section of the cut sample was measured.

Further, since the high basis weight portion 42 having the basis weight difference and the density difference and the low basis weight portion 43 are formed in the above-described aspect, the skin contact surface in the central portion 41 of the absorbent core 4 is respectively in the absorbent core. The width direction Y of the body 4 extends to form a plurality of lateral grooves 44a that are recessed toward the non-skin contact surface side. In the present specification, the skin contact surface is the surface of the absorbent article or the constituent member that faces the wearer's skin side when worn, and the non-skin contact surface is the wearable article or the constituent member thereof when worn. The opposite side of the skin side of the wearer.

Further, as shown in Fig. 3(b), the high basis weight portion 46 and the low basis weight portion 47 are alternately formed in the lateral direction 45 of the absorbent core 4 in the longitudinal direction X of the absorbent core 4, respectively. The basis weight portion 47 extends along the width direction Y of the absorbent core 4. The basis weight of the high basis weight portion 46, which is the material for forming the absorbent core, is relatively higher than that of the low basis weight portion 47, and the low basis weight portion 47 is the basis weight of the material for forming the absorbent core and the high basis weight portion 46. Relatively low basis weight.

Further, since the high basis weight portion 46 having the basis weight difference and the density difference and the low basis weight portion 47 are formed in the above-described aspect, the skin contact surfaces in the lateral region 45 of the absorbent core 4 are also respectively The width direction Y of the absorbent core 4 extends to form a plurality of lateral grooves 44b that are recessed toward the non-skin contact surface side.

In the side region 45 of the absorbent core 4, the ratio of the basis weight of the low basis weight portion 47 forming the bottom of the lateral groove 44 to the basis weight of the high basis weight portion 46 is preferably 5% or more, more preferably 10% or more, further preferably 50% or less, more preferably 40% or less, further preferably 5% or more and 50% or less, more preferably 10% or more and 40% or less. Further, the basis weight of the high basis weight portion 46 is preferably 50 g/m ² or more, more preferably 100 g/m ² or more, further preferably 400 g/m ² or less, more preferably 300 g/m ² or less. It is preferably 50 g/m ² or more and 400 g/m ² or less, more preferably 100 g/m ² or more and 300 g/m ² or less. The basis weight of the low basis weight portion 47 is preferably 2.5 g/m ² or more, more preferably 5 g/m ² or more, further preferably 200 g/m ² or less, more preferably 150 g/m ² or less, and further, It is preferably 2.5 g/m ² or more and 200 g/m ² or less, more preferably 5 g/m ² or more and 150 g/m ² or less.

The high basis weight portion 46 has a larger base weight and a larger thickness than the low basis weight portion 47 forming the bottom of the lateral groove 44. The ratio of the thickness of the low basis weight portion 47 to the thickness of the high basis weight portion 46 is preferably 5% or more, more preferably 10% or more, further preferably 50% or less, more preferably 40% or less, and It is preferably 5% or more and 50% or less, more preferably 10% or more and 40% or less. Further, the thickness of the high basis weight portion 46 is preferably 0.8 mm or more, more preferably 1 mm or more, further preferably 5 mm or less, more preferably 4 mm or less, further preferably 0.8 mm or more and 5 mm or less, more preferably It is 1 mm or more and 4 mm or less. The thickness of the low basis weight portion 47 is preferably 0.04 mm or more, more preferably 0.08 mm or more, further preferably 0.4 mm or less, more preferably 0.32 mm or less, and further preferably 0.04 mm or more and 0.4 mm or less. More preferably, it is 0.08 mm or more and 0.32 mm or less.

Further, in the case where the value of the high basis weight portion 46 or the relationship with the low basis weight portion 47 is such that the sanitary napkin 1 of the present embodiment includes a longitudinal groove to constitute an absorbent core, It is sufficient to meet the high basis weight portion that does not include the longitudinal groove 52.

Further, the method of measuring the basis weight and the thickness of each of the high basis weight portion 46 and the low basis weight portion 47 is performed in the same manner as the measurement method of the high basis weight portion 42 and the low basis weight portion 43 described above.

Further, the high basis weight portion 42 of the central portion 41 has a larger basis weight than the high basis weight portion 46 of the side portion region 45, and has a larger thickness than the high basis weight portion 46 of the side portion 45. Thereby, the thickness t1 of the central region 41 is thicker than the thickness t2 of the side region 45, and the central portion 41 is formed with the protrusion portion 5 which protrudes upward from the upper surface S2 of the side region 45.

The ratio of the thickness t1 of the central portion 41 to the thickness t2 of the side region 45 is preferably 110% or more, more preferably 120% or more, further preferably 400% or less, more preferably 300%. Hereinafter, it is preferably 110% or more and 400% or less, more preferably 120% or more and 300% or less. In the present embodiment, the thickness t1 of the central portion 41 is the thickness of the high basis weight portion 42 located at the central portion in the width direction of the central portion 41, and the thickness t2 of the side portion 45 is a high basis weight portion adjacent to the central portion 41. The above thickness of 46.

The projection 5 is attached to any of the liquid discharge portion facing portion B and the rear portion C, and the ratio of the height t protruding from the upper surface S2 of the side region 45 to the entire thickness t1 of the central portion 41 is preferably 20% or more, more preferably 30% or more, further preferably 90% or less, more preferably 80% or less, further preferably 20% or more and 90% or less, more preferably 30% or more and 80% or less . The protrusion height t of the protrusion 5 is the same as the value obtained by subtracting the thickness t2 of the side area 45 from the entire thickness t1 of the center area 41.

The low basis weight portion 43 of the central portion 41 and the low basis weight portion 47 of the side portion 45 are aligned at the boundary portion between the central portion 41 and the side portion 45 in the longitudinal direction X of the absorbent core 4, and similarly The lateral groove 44a of the central portion 41 and the lateral grooves 44b of the side regions 45 and 45 are aligned at the boundary portion in the longitudinal direction X of the absorbent core 4.

That is, the lateral groove 44a of the central portion 41 and the lateral groove 44b of the lateral regions 45, 45 form a transverse groove 44 continuous from the central region 41 of the absorbent core 4 over the lateral regions 45, 45, the transverse groove The 44 series extends throughout the entire width of the absorbent core 4. Further, the lateral grooves 44 are formed in a plurality of strips at intervals in the longitudinal direction of the absorbent core 4. In other words, the low basis weight portion 43 of the central region 41 and the low basis weight portion 47 of the side region 45 are formed to continuously extend one of the low basis weights throughout the entire width of the absorbent core 4, the one of the low basis weight portions The basis weight, thickness and density of the forming material of the absorbent core are smaller than the high basis weights 46 of the side regions 45.

Regarding the lateral groove 44, the space in the lateral groove which is continuously opened from the central region to the lateral region and continuously on the upper side is continuously present between the central region and the lateral region without interruption from the central region and the lateral region. In the sanitary napkin 1 of the present embodiment, as shown in Fig. 2(b), the lateral grooves 44 are crossed in a cross shape in the plan view and the longitudinal grooves 50 to 52 which will be described later, and are opposed to each other with the longitudinal grooves therebetween. There is an empty space in the other transverse groove on the extension of the space in one of the lateral grooves In the case of all or part of the interval, it is assumed that the lateral groove at the intersection with the longitudinal groove is not interrupted.

Further, a plurality of the horizontal grooves 44 are formed in the width direction Y of the absorbent core 4, and the portions P1 and P1 of the central portion 41 adjacent to the side regions 45 (see FIG. 2(b)) are located at the bottom portion 44d. The upper surface 45 is lower than the upper surface S2. The position of the upper surface S2 of the side area 45 mentioned here is the upper surface of the high basis weight 46 in the portion of the side area 45 adjacent to the central area 41. As shown in Fig. 2(b), the bottom portion 44d of the lateral groove 44 is preferably located over the entire area of the central portion 41 in the width direction of the absorbent core 4 and below the upper surface S2 of the side portion 45. In the present sanitary napkin 1, the low basis weight portion 43 of the central portion 41 has a smaller basis weight and thickness than the high basis weight portion 46 of the side portion 45, whereby the lateral groove 44 allows the bottom portion 44d to pass over the absorbent core. The entire area of the central portion 41 in the width direction of the body 4 is located below the upper surface S2 of the side portion 45.

Whether the bottom portion 44d of the lateral groove 44 is located at a position lower than the upper surface S2 of the side portion 45 is determined by measuring the thickness of the bottom portion 44d of the portion P1, P1 adjacent to the side region 45 of the central portion 41, and the lateral side. Judging by the thickness of the high basis weight portion 46 of the region 45. Specifically, first, the absorbent core 4 is taken out from the menstrual sanitary napkin 1, and the thickness of the high basis weight portion 46 of the side region 45 is measured based on the bottom surface of the central portion 41. The thickness was measured by pressing each part at a pressure of 5 kPa for 10 minutes, and after removing the weight, an acrylic plate having a size of 20 mm × 20 mm and a thickness of 3 mm was placed in the measurement site and a non-contact type manufactured by KEYENCE Corporation was used. Laser displacement meter (laser head LK-G30, displacement meter LK-GD500. Then, a single-edged razor manufactured by FEATHER Co., Ltd. was used to cut the central portion 41 from the side region 45 adjacent to the side region 45 using the single-sided razor. The measuring portion of the bottom portion 44d was pressed at a pressure of 5 kPa for 10 minutes, and the thickness was measured immediately after the weight was removed. The acrylic sheet having a size of 20 mm × 20 mm and a thickness of 3 mm was placed in the central portion of the sample after the weight removal. On the absorber 3, the thickness of the sample was measured using a non-contact laser displacement meter manufactured by KEYENCE (laser head LK-G30, displacement meter LK-GD500. The size of the cut piece was small and it was difficult to use non- When a contact laser displacement meter is used for measurement, for example, The cross section of the cut sample was observed and measured at a magnification of 20 to 100 times using a microscope (VHX-1000 manufactured by KEYENCE Corporation). If the thickness of the measuring portion of the bottom portion 44d of the portions P1 and P1 adjacent to the side region 45 of the central portion 41 is larger than the thickness of the high basis weight portion 46 of the side region 45 obtained before, the bottom of the lateral groove 44 44d is located further below the position of the upper surface S2 of the side area 45.

The absorbent core 4 integrally forms the central region 41 including the projections 5 with the pair of lateral regions 45, 45. Unlike the members manufactured in the other steps by bonding means such as an adhesive or compression, "integral molding" means that the same material is integrally formed in one step. Therefore, for example, there is no layer as in the case where the two absorbent cores which are separately manufactured are overlapped between the portion 42u of the projection 5 formed in the central region 41 and the portion 42d which is located further below it The abutting portion or the joint portion, and at the boundary portion between the central portion 41 and the side regions 45, 45, there is no adjacent portion of the core bodies generated by arranging two separately manufactured absorbent cores side by side or combination.

When the central region 41 including the projections 5 is integrally formed with the pair of lateral regions 45, 45, the absorbed liquid has continuity of smooth movement. The method for producing the absorbent core of this configuration will be described below.

Further, the absorbent core 4 is attached to either of the central region 41 and the lateral region 45, and the skin abutting surface has a concave-convex shape by the presence of the lateral grooves and the longitudinal grooves described below. The non-skin contact surface side is flat.

According to the sanitary napkin 1 of the present embodiment, the central portion 41 having the projection portion 5 is formed with a lateral groove 44 which is deeper and the bottom portion 44d reaches a position deeper than the upper surface S2 of the lateral portion 45 and The central portion 41 extends to the side portion 45, and the lateral groove 44 is formed by lowering the basis weight of the material for forming the absorbent core. Therefore, in general, the protrusion 5 is easily hindered from bending, but is rich. It is deformable and wrinkles are not easily generated on the skin abutting surface. Therefore, as shown in FIG. 4, the protrusion 5 can be formed on one side and formed therefrom The ridge portion 11 is deformed in such a manner as to conform to the body shape of the wearer along the liquid discharge portion or the gluteal groove of the wearer, and is excellent in conformability with respect to the unevenness of the body and relative to the activity of the wearer. It is excellent in following deformation, and it is also difficult to impart discomfort due to wrinkles or creases of the absorbent core.

This effect is more pronounced if the bottom portion 44d of the lateral groove 44 is located further than the entire area of the central portion 41 in the width direction Y of the absorbent core 4 and is located below the upper surface S2 of the side portion 45.

Further, since the absorbent core system is integrally formed and the lateral grooves 44 are formed by lowering the basis weight of the material for forming the absorbent core, the liquid absorbed from the projections 5 is smoothly diffused in the thickness direction in the central region 41 and the liquid is also liquid. It is easy to diffuse from the vicinity of the bottom of the lateral groove 44 to other portions, and the liquid remaining in the vicinity of the bottom of the lateral groove 44 does not rewet back to the skin contact surface by pressurization. Therefore, even when a large amount of liquid is supplied, the skin abutting surface is less likely to remain in the liquid, and a comfortable wearing feeling is obtained.

The ratio of the depth of the lateral groove 44 in the central region 41 to the thickness t1 of the central region 41 is preferably 50% or more, more preferably 60% or more, from the viewpoint of further exerting such an effect. It is preferably 95% or less, more preferably 90% or less, further preferably 50% or more and 95% or less, more preferably 60% or more and 90% or less.

Further, the width W of the lateral groove 44 is preferably 0.2 mm or more, more preferably 0.5 mm or more, further preferably 3 mm or less, more preferably 2 mm or less, further preferably 0.2 mm or more and 3 mm or less, more preferably It is 0.5 mm or more and 2 mm or less. As shown in Fig. 3(a), the width W of the lateral groove 44 is the dimension in the longitudinal direction X of the absorbent core.

Further, in the sanitary napkin 1, since the high basis weight portion 42 of the central portion 41 has a higher density than the low basis weight portion 43, the body fluid taken into the lateral groove 44 is quickly ingested by the high basis weight portion 42. . Therefore, since the body fluid is absorbed along the lateral groove 44 in the longitudinal direction of the absorbent core 4, the body fluid absorption in the central region is efficiently performed. As a result, the liquid leakage suppression of the self-absorbent core 4 is improved. In addition, even in the side area 45 high basis weight The density is also higher than that of the low basis weight portion 47, so that the same effect is obtained.

In each of the central region 41 and the side region 45, the ratio of the density of the low basis weight portion to the density of the adjacent high basis weight portion is preferably 5% or more, more preferably 10% or more, and further preferably It is 50% or less, more preferably 40% or less, further preferably 5% or more and 50% or less, more preferably 10% or more and 40% or less.

In the absorbent core 4 of the sanitary napkin 1, as shown in Figs. 1, 2(a) and 2(b), in the central region 41, the lateral regions 45, 45, and the center in the longer direction. The ends of the region 41 are further outside the front and rear end regions, including the longitudinal grooves 50-52. Similarly to the lateral groove 44a, the vertical groove 50 of the central portion 41 is formed in the central portion 41 with the basis weight of the material for forming the absorbent core and the low basis weight portion 48 having a thickness smaller than that of the high basis weight portion 42. The longitudinal grooves 50 of the central portion 41 need not continuously extend to the front and rear end regions. Similarly to the lateral grooves 44b, the longitudinal grooves 51 and 52 of the side region 45 are provided with the basis weight and thickness of the material for forming the absorbent core in the side region 45 which is smaller than the low basis weight portion 49 of the high basis weight portion 46. form.

Further, in the absorbent core 4 of the sanitary napkin 1, as shown in Fig. 1, the rear end region is formed on the outer side before the both ends of the central portion 41 in the longitudinal direction X, and the side region 45 is formed. The high basis weight portion 46 and the low basis weight portion 47 have the same high basis weight and low basis weight in terms of the basis weight, density, and thickness, thereby forming the same shape as the lateral groove 44b of the side region 45. Horizontal groove 53.

According to the sanitary napkin 1 of the present embodiment, since the longitudinal groove 50 along the longitudinal direction of the absorbent core 4 is formed in the central region 41 having the projection 5, the projection 5 and the ridge formed by the projection can be formed. The portion 11 is further deformed in such a manner as to conform to the shape of the wearer, thereby further improving the conformability with respect to the unevenness of the body. Further, the liquid absorbs in the thickness direction of the central portion 41, and the liquid is less likely to remain on the skin contact surface.

The longitudinal groove 50 formed in the central portion 41 does not need to be located below the upper surface S2 of the portion of the side region 45 adjacent to the central portion 41. That is, as shown in FIG. 2(b), the vertical groove 50 may have a bottom portion located above the portion of the side region 45 adjacent to the central portion 41. Further below the surface S2, the bottom portion thereof may be located at the same position as or above the upper surface S2 of the portion of the side region 45 adjacent to the central portion 41.

The absorbent core 4 of the sanitary napkin 1 can be manufactured by using a fiber-splitting device comprising: a fiber-splitting cylinder 54 that includes a collecting recess 55 on the outer peripheral surface and rotating in one direction A; and a catheter (not shown) The material for forming the absorbent core is supplied to the outer peripheral surface of the fiber-splitting cylinder 54 in a scattered state.

The accumulation concave portion 55 is formed in a plurality of circumferential directions on the outer circumferential surface of the fiber bundle cylinder 54 at a fixed interval. The bottom surface 56 of the collecting recess 55 includes a mesh plate or the like and includes a plurality of fine holes that function as suction holes.

As shown in FIG. 5(a), a recess 56a for forming the central portion 41 having the projection 5 is formed in a portion of the bottom surface 56 of the accumulation recess 55. A gas-impermeable member 57 for forming a low basis weight such as a low basis weight portion 43, 47 is disposed at the bottom of the collecting recess 55. The gas-impermeable member 57 is fixed so as to protrude from the bottom surface of the collecting recess 55, and may be a non-breathable member including, for example, metal or plastic.

In the same manner as the known fiber-splitting device including the fiber-splitting cylinder, the material for forming the absorbent core is supplied into the catheter while sucking from the bottom surface of the collecting recess 55, as shown in Fig. 5(b). The material for forming the absorbent core is deposited in a specific shape in the collecting recess 55. The absorbent core 4 is obtained by demolding the deposit 4' from the collecting recess 55. The absorbent core 4 may be appropriately compressed by pressurization between a pair of rolls or the like before or after being coated with the clad material. As shown in Fig. 5 (b), the portion 43' including the core forming material deposited on the gas-impermeable member 57 is a low basis weight portion 43 or the like, and is deposited on the bottom portion of the bottom surface of the gas-impermeable member 57. 'Become a high base weight 42 and so on. Further, as described above, by pressing the central portion 41 of the absorbent core 4, a high basis weight portion 42 having a higher density than the low basis weight portion 43 is formed in the central portion 41, which is different from the portion forming the central portion 41. By pressing the side region 45, a high basis weight portion 46 having a higher density than the low basis weight portion 47 is formed in the side region 45. For the production of an absorbent core comprising a water-absorbing polymer In the case of the catheter, it is preferred to provide an introduction portion of the water-absorbent polymer in the middle of the catheter.

The surface sheet 2a and the non-skin side sheet 3 can be used in the same manner as the prior users in the technical field without any particular limitation. For example, as the surface sheet 2a, a non-woven fabric having a liquid permeability or a perforated film can be used. As the non-skin side sheet 3, a water-impermeable non-woven fabric having a high water pressure resistance such as a liquid-impermeable film made of a synthetic resin or a spunbond-melt-spin-bonded layer non-woven fabric can be used. Moreover, as the three-dimensional shield forming sheet 2b, a water-repellent non-woven fabric having a high water pressure resistance, for example, a spunbond-melt-spray-spun layer non-woven fabric or the like can be used.

Next, the menstrual sanitary napkins of the second and third embodiments of the present invention will be described. The configuration of the absorbent core of the menstrual sanitary napkin of the second and third embodiments is different from that of the first embodiment. In the second and third embodiments, the differences from the first embodiment will be mainly described, and the same reference numerals are given to the same points, and the description thereof will be omitted. The description relating to the first embodiment will be appropriately applied to the points that are not particularly mentioned.

As shown in Fig. 6, Fig. 7(a) and Fig. 7(b), the protruding portion 5 of the absorbent core 4A in the menstrual sanitary napkin of the second embodiment includes the central portion 41M from the central portion 41 toward the lateral region. 45, 45 lowered inclined side 41S. The inclined side faces 41S are formed on both side portions in the longitudinal direction of the protruding portion 5. As shown in Fig. 7(a), the protruding portion 5 includes a flat central portion 41M, and includes inclined side surfaces 41S having a straight line shape on both sides thereof. The corner portion between the central portion 41M and the inclined side surface 41S, and the boundary portion between the inclined side surface 41S and the side surface portion 45 may be smoothly continuous through the curved surface of the cross-sectional arc shape without having an angle. Further, the inclined side surface 41S may have a convexly curved cross-sectional shape on the skin contact surface or the non-skin contact surface side.

The menstrual sanitary napkin according to the second embodiment exhibits the same effects as the sanitary napkin 1 of the first embodiment, and also has the following effects by having the inclined side surface 41S. In other words, the boundary portion with the side region 45 is easily bent from the inclined side surface 41S toward the non-skin contact surface side, and the shape of the central portion 41M having a relatively high rigidity is not changed and bulged, so that it is easy to follow the body, thereby improving the compliance. It is advantageous from the viewpoint of sex and improvement in wearing feeling.

The lateral groove 44 of the absorbent core 4A in the second embodiment is wide in the width of the absorbent core 4A. The bottom portion 44d of the portion P1, P1 adjacent to the side region 45 of the central region 41 in the degree direction Y is located below the upper surface S2 of the side region 45, and on the other hand, the middle portion 41M of the central portion 41 is horizontal. The bottom of the groove 44 is located above the upper surface S2 of the side area 45.

The absorbent core 4A of the second embodiment is formed such that the concave portion 56a provided in the accumulation concave portion 55 forms an inclined surface corresponding to the inclined side surface 41S and partially protrudes from the bottom surface of the self-concentrating concave portion 55 of the gas-impermeable member. In addition to this, it can manufacture similarly to the manufacturing method of the absorptive core 4 of 1st Embodiment.

As shown in Fig. 8, Fig. 9(a) and Fig. 9(b), the absorbent core 4B in the menstrual sanitary napkin of the third embodiment is such that the thickness of the absorbent core 4B is the width of the absorbent core 4B. The direction Y is decreased from the central portion 41M of the central portion 41 toward both ends in the width direction Y of the absorbent core 4B. More specifically, the absorbent core 4B includes a central portion 41M whose skin abutting surface is relatively flat from a portion of the liquid excretion portion facing portion B over one of the rear portions C, and has a thickness from the periphery toward the absorbent core. The circumference of the body is decreasing. As in the case of the absorbent core 4B, in the case where the skin abutting surface of the absorbent core does not clearly distinguish between the sharp portion of the projection 5 and the lateral region 45 of the central region 41, as shown in FIG. 9 ( a) and Fig. 9(b), the length 3 of the width direction Y of the absorbent core is equally divided, and the central portion is defined as the central region 41, and the portions on both sides thereof are defined as the lateral region 45. 45. When the absorptive core 4B of the third embodiment is divided as such, the central region 41 includes the central region inclined side surface 41S, and the side regions 45 and 45 include the lateral region inclined side surface 45S.

According to the third embodiment, not only the effect similar to that of the sanitary napkin 1 of the first embodiment but also the inclination of the center region 41 and the side region 45 toward the both ends in the width direction Y of the absorbent core 4B is exhibited. It also exerts the following effects. In other words, the absorbent core 4B is easily bent so that the skin contact surface side is convex and the non-skin contact surface side is recessed, and the center portion having a relatively high rigidity is formed by the inclination of the central region 41 and the side region 45. Since the shape of the 41M is raised without change and it is easy to follow the body, it is advantageous from the viewpoint of improving the conformability and improving the wearing feeling.

Hereinabove, the present invention has been described based on preferred embodiments of the present invention, but the present invention is not limited to the above embodiments.

For example, in the absorbent core according to the first to third embodiments, the longitudinal grooves extending in the longitudinal direction of the absorbent core are formed, but the longitudinal grooves may not be formed. Further, a longitudinal groove in the central region may be provided, and on the other hand, a longitudinal groove in the lateral region may not be provided. Conversely, a longitudinal groove in the central region may not be provided, and a longitudinal groove in the lateral region may be provided on the other hand. .

Further, the lateral groove 44 continuous from the central region 41 over the side region 45 may be formed only in the liquid discharge portion facing portion of the absorbent article, or may be formed only in the rear portion.

Further, in the absorbent core 4A of the second embodiment, the inclined surface corresponding to the inclined side surface 41S is formed in the concave portion 56a of the accumulation concave portion 55, and the inclined side surface 41S is formed, but the thickness of the central portion 41 may be After the absorbent core which is uniform in the width direction Y of the absorbent core 4 is produced, it is formed by pressurizing a portion adjacent to the side region in the central region 41 by pressurizing it.

Further, the absorbent core may be composed only of a fibrous material such as pulp fibers, and may also contain both a fibrous material and a superabsorbent polymer. As the fibrous material, various fibrous materials previously used for absorbent bodies of absorbent articles such as menstrual sanitary napkins or sanitary pads, disposable diapers, and the like, such as pulp fibers, rayon fibers, and cotton, can be used without particular limitation. Short fibers of cellulose fibers such as fibers, or short fibers of synthetic fibers such as polyethylene. These fibers may be used alone or in combination of two or more. Further, it is preferable that all or a part of the fibrous material is pulp fibers, and the ratio of the pulp fibers in the fibrous material is preferably from 50 to 100% by mass, more preferably from 80 to 100% by mass, still more preferably 100% by mass. Further, in the absorbent core, in addition to the superabsorbent polymer, a deodorant or an antibacterial agent may be formulated as needed.

Further, in the above embodiment, the density of the high basis weight is higher than that of the low basis weight portion, but the density of both may be the same by omitting the pressing step of the absorbent core.

Moreover, the absorbent article of the present invention may be a sanitary pad (vaginal secretion pad), an incontinence pad, a disposable diaper, or the like, in addition to the menstrual napkin. The description of the above-described embodiments and the requirements of only one embodiment can be appropriately applied to other embodiments, and the requirements of the respective embodiments can be appropriately replaced with each other.

In the above embodiment, the present invention further discloses the following absorbent article.

<1> An absorbent article comprising an absorbent core having a shape in a front-rear direction before and after an absorbent article, wherein the absorbent core comprises a central region in a width direction thereof and a side surface on both sides thereof a central portion including a protrusion protruding upward from an upper surface of each of the side regions, wherein the absorbent core system integrally forms the central region and the lateral region, and abuts the skin of the absorbent core a plurality of lateral grooves along the width direction of the absorbent core are continuously formed from the central region over the lateral region, and the lateral grooves are formed by reducing the basis weight of the material for forming the absorbent core. And the lateral groove is located at a lower portion of the central region adjacent to the lateral region and is located below the upper surface of the lateral region.

<2> The absorbent article according to the above <1>, wherein in the central region of the absorbent core, the high basis weight portion and the low basis weight portion forming the bottom portion of the lateral groove are alternately formed on the absorbent core The length direction.

The absorbent article according to the above <1>, wherein the bottom of the lateral groove is located above the central region in the width direction of the absorbent core and is located above the lateral region. The upper surface is lower.

The absorbent article according to any one of the above aspects, wherein the central portion is formed with a longitudinal groove along the longitudinal direction of the absorbent core.

The absorbent article according to any one of the above aspects, wherein the protrusion is formed from a portion of the liquid discharge portion facing the rear portion.

The absorbent article of any one of the above-mentioned <1> to <5> wherein The starting portion includes an inclined side surface that descends from the central portion of the central region toward the lateral region.

The absorbent article according to any one of the above aspects, wherein the thickness of the absorbent core decreases from a central portion of the central region toward both ends in a width direction of the absorbent core.

The absorbent article according to any one of <1> to <7> wherein, in the central region of the absorbent core, the basis weight of the low basis weight portion is relative to the basis weight of the high basis weight portion The ratio is 5% or more and 80% or less.

The absorbent article according to any one of the above items, wherein the basis weight in the central region of the absorbent core is 200 to 800 g/m ² in the high basis weight, which is low. The base weight is 10 to 400 g/m ² .

The absorbent article according to any one of the above aspects, wherein the density of the high basis weight portion relative to the low basis weight absorbing member is higher in a central region of the absorbent core. high.

The absorbent article according to any one of the above aspects, wherein the ratio of the thickness of the low basis weight portion to the thickness of the high basis weight portion in the central region of the absorbent core is 5% or more and 50% or less.

The absorbent article according to any one of the above aspects, wherein the basis weight of the low basis weight relative to the basis weight of the high basis weight in the lateral region of the absorbent core The ratio is 5% or more and 50% or less.

The absorbent article according to any one of the above aspects, wherein the basis weight in the side region of the absorbent core is 50 to 400 g/m ² in the high basis weight portion. The low basis weight is 2.5 to 200 g/m ² .

The absorbent article according to any one of the above aspects, wherein the thickness of the low basis weight portion is relative to the thickness of the high basis weight portion in a side region of the absorbent core. The ratio is 5% or more and 50% or less.

The absorbent article according to any one of the above aspects, wherein the thickness of the high basis weight is 0.8 mm or more and 5 mm or less in the side region of the absorbent core. The thickness of the heavy portion is 0.04 mm or more and 0.4 mm or less.

The absorbent article according to any one of the above aspects, wherein the ratio of the thickness of the central region to the thickness of the lateral region is 110% or more and 400% or less.

The absorbent article according to any one of the above aspects, wherein the ratio of the depth of the lateral grooves in the central region to the thickness of the central region is 50% or more and 95% or less.

<18> The absorbent article according to any one of <1> to <17> wherein the transverse groove has a width of 0.2 to 3 mm.

The absorbent article according to any one of the above-mentioned items, wherein the absorbent core system has a concave-convex shape in any of the central region and the lateral region, and is non-skin-resistant The junction sides are all flat.

The absorbent article according to any one of the above aspects, wherein the protrusion is attached to the upper surface of the liquid discharge portion and the rear portion, and protrudes from the upper surface of the side region. The ratio of the height to the entire thickness of the central region is 20% or more and 90% or less.

The absorbent article according to any one of the above aspects, wherein the ratio of the width of the protruding portion to the entire width of the absorbent core is 20% or more and 80% or less.

The absorbent article of any one of the above-mentioned <1> to <21> which comprises one of the pair of side flaps extending from both side edges of the above-mentioned absorbent core.

The absorbent article according to any one of the above aspects, wherein the absorbent core system comprises a fiber aggregate of a fiber material or a polymer having a high water absorption between the fibers of the fiber assembly. Founder.

<24> The absorbent article according to the above <23>, wherein the fiber material is all Or a part of the pulp fiber.

<25> The absorbent article according to the above <23>, wherein the absorbent core system is coated with the upper and lower surfaces of the coated core material.

<26> The absorbent article according to the above <25>, wherein the above-mentioned coated core material comprises a toilet paper or a water-permeable nonwoven fabric.

<27> The absorbent article according to any one of <1> to <26> wherein the absorbent article is a menstrual sanitary napkin.

[Industrial availability]

The absorbent article according to the present invention is excellent in conformability with respect to the unevenness of the body and is excellent in followability with respect to the wearer's activity, and is also less likely to cause discomfort due to wrinkles or creases of the absorbent core. . Further, the liquid system absorbed from the protrusion is quickly absorbed by the penetration into the lateral groove and reaches the bottom of the lateral groove, and then the bottom of the lateral groove having a higher density of the absorbent material than the bottom of the lateral groove. Since the abutting portion moves, it is less likely to stay in the vicinity of the bottom of the lateral groove, and it is also less likely to cause back oozing to the skin abutting surface.

1‧‧‧Periodical cotton

2a‧‧‧Surface sheet

2b‧‧‧Three-dimensional shield forming sheet

3‧‧‧Non-skin side sheet

5‧‧‧Protruding

21‧‧‧ Side edge

41‧‧‧Central area

42‧‧‧High base

42d‧‧‧Parts

Section 42u‧‧‧

43‧‧‧Low basis weight

44‧‧‧ transverse slot

44a‧‧‧ transverse slot

44b‧‧‧ transverse slot

44d‧‧‧ bottom

45‧‧‧Side area

46‧‧‧High base

47‧‧‧Low basis weight

48‧‧‧Low basis weight

49‧‧‧Low basis weight

50‧‧‧ longitudinal slot

51‧‧‧ longitudinal slot

52‧‧‧Longitudinal slot

P1‧‧‧ parts

S2‧‧‧ upper surface

T‧‧‧ Height

T1‧‧‧ thickness

T2‧‧‧ thickness

W1‧‧‧Width

W2‧‧‧Width

Y‧‧‧ direction

Claims (6)

An absorbent article comprising an absorbent core having a shape that is long in a front and rear direction of the absorbent article, and wherein the absorbent core includes a central region and a lateral region on both sides thereof in a width direction thereof, The central region includes a portion that protrudes upward from the upper surface of each of the lateral regions, and the absorbent core system integrally forms the central region and the lateral region to abut the skin of the absorbent core a plurality of lateral grooves along the width direction of the absorbent core are continuously formed from the central region over the lateral region, and the lateral grooves are formed by reducing the basis weight of the material for forming the absorbent core. And the bottom of the central region adjacent to the lateral region is located lower than the upper surface of the lateral region, wherein the central region includes a low basis weight forming a bottom portion of the lateral groove, And a high basis weight portion adjacent to the low basis weight portion, the high basis weight portion having a higher density than the low basis weight portion. The absorbent article according to claim 1, wherein the bottom of the lateral groove is located below the upper surface of the lateral region over the entire region of the central region in the width direction of the absorbent core. The absorbent article according to claim 1 or 2, wherein a longitudinal groove along the longitudinal direction of the absorbent core is formed in the central region. The absorbent article according to claim 1 or 2, wherein the absorbent article has a liquid discharge portion facing portion and a rear portion in a longitudinal direction thereof, and the protrusion portion is from a portion of the liquid draining portion facing the rear portion And formed. The absorbent article of claim 1 or 2, wherein the protruding portion includes an inclined side surface that descends from a central portion of the central region toward the lateral region. The absorbent article according to claim 1 or 2, wherein the thickness of the absorbent core is decreased from a central portion of the central region toward both ends in a width direction of the absorbent core.