TWI691313B - Absorbent article - Google Patents

Abstract

The present invention is an absorbent article comprising an absorber (4) between a skin-side sheet (2a, 2b) forming a skin-facing side and a non-skin side sheet (3) forming a non-skin-facing side The absorbent body (4) includes a longitudinally long absorbent core (40) along the front-rear direction of the absorbent article, and the absorbent core (40) is provided at the opposite part of the excretory part: a lateral region (45) ), which are located on both sides in the width direction; and the central region (41), which is located on the center side in the width direction and thicker than the lateral region (45); the lateral region (45) and the center The area (41) is integrally formed, the central area (41) protrudes toward the non-skin side sheet side, and in the absorber (4), the area where the side area (45) is located in the absorber (4) has a non-skin side sheet (3) Non-bonded area of bonding.

Description

Absorbent article

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

Previously, it is well known that the absorber of absorbent articles such as menstrual napkins provides a bulge in such a manner as to follow the uneven shape of the wearer's skin, and it is also known to form grooves in the bulge. For example, Patent Documents 1 and 2 disclose an absorber having a raised portion having a groove near the center of the absorber.

Prior technical literature Patent Literature

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

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

The present invention relates to an absorbent article which is provided with an absorber between the skin-side sheet forming the skin-facing side and the non-skin side sheet forming the non-skin-facing side, the absorber including the absorbent article A longitudinally long absorbent core in the front-rear direction. The above-mentioned absorbent core has a lateral region on the opposite side of the excretory portion, and is located on both sides in the width direction, and a central region, which is located on the center side in the width direction from the lateral region and has a thickness greater than the lateral region. The lateral region and the central region are integrally formed, and the central region protrudes toward the non-skin side sheet side. In the absorbent body, the area where the side area is located in a plan view has a non-joint area that is not joined to the non-skin side sheet.

1: Sanitary napkin

2: Skin side sheet

2a: Front sheet

2b: side sheet

3: Non-skin side sheet

4: Absorber

5: Central protrusion

6: Absorbent body

7: Flank

8: Rear wing

12: Protruding part adjoins high-density part

12': both sides in the width direction (the part where the protruding part is adjacent to the high-density part)

40: Absorbent core

40A: Absorbent core

41: Central area

41': Central thick wall area

42: High basis weight

42d: The part that forms the central protrusion of the central area

42u: The part closer to the skin side than the part that forms the central protrusion of the central region

43: Low basis weight

44: horizontal groove

44a: horizontal groove

44b: horizontal groove

44d: bottom

45: Lateral area

45': side area of the absorber

46: High basis weight

47: Low basis weight

48: Low basis weight

49: Low basis weight

50: longitudinal groove

50a: opening

50b: bottom

52: Lateral longitudinal groove

52a: opening

52b: bottom

53: Fiber stacking device

54: Fiber stacking cylinder

55: recess for gathering

56: underside

56a: recess

57, 58: Difficult breathable member

59: Catheter

61: Pressure roller

62: recess

63: Smooth roller

A: Front part

B: Facing Department

C: Rear

CD: direction orthogonal to the transport direction

La: width of the opening

Lb: length in the width direction of the bottom

MD: Transport direction

R: direction

S2: the surface below the lateral area

t: protrusion height of the central protrusion

t1: thickness of the central area

t2: thickness of the lateral area

W1: The width of the central protrusion

W2: the entire width of the absorbent core

X: length direction (front-rear direction)

Y: width direction

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

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

Fig. 3 is a plan view of the absorbent body of the menstrual tampon shown in Fig. 1 viewed from the non-skin opposite side.

4 (a), (b) is an example of a method of forming a protrusion with a density higher than the central protrusion and a basis weight higher than the side area adjacent to the high-density portion by pressing both sides of the central thick-walled region Illustrating.

Fig. 5 is a schematic view showing the deformed state of the absorbent body of the menstrual tampon of Fig. 1 in a worn state.

Fig. 6 is a schematic view showing the main part of a fiber stacking device preferably used in the manufacture of the absorbent core of the menstrual tampon shown in Fig. 1.

7(a) and 7(b) are schematic views showing a cross section of the outer circumferential portion of the fiber stacking tube in the fiber stacking device shown in FIG. 6 along the tube circumferential direction.

The absorber in Patent Document 1 has a laminated structure including an upper layer and a lower layer, and a groove penetrating the upper and lower layers is formed in the central region where the bulge is formed of the upper layer. However, the groove is formed by hot embossing, so the bottom of the groove is compacted, so there is room for improvement in the flexible followability of the wearer's activities.

In addition, in Patent Document 2, an absorbent body having a plurality of block-shaped convex portions is also provided with a bulge portion including a plurality of convex portions. The bulge portion easily follows the movement of the wearer, but is applied from the wearer's side when wearing There is room for improvement in the timeliness of the strong pressure situation.

Therefore, an object of the present invention is to provide an absorbent article that can further improve the performance of the aforementioned prior art.

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

The menstrual sanitary napkin 1 (hereinafter also simply referred to as sanitary napkin 1) as the first embodiment of the absorbent article of the present invention is a night-use sanitary napkin suitable for use at bedtime, and preferably 30 cm or more in length.

As shown in FIG. 1, the sanitary napkin 1 has an absorbent body 6 having a long shape in the front-rear direction, a pair of side wing portions 7, 7, and a pair of rear wing portions 8, 8. With regard to absorbent articles such as menstrual sanitary napkins, the so-called "front-rear direction" refers to the direction in which the wearer matches the front-rear direction of the wearer. In this specification, the front-rear direction is the longitudinal direction, and the direction orthogonal thereto is referred to as the width direction.

The sanitary napkin 1 has a front portion A, an excretory portion opposing portion B, and a rear portion C in its longitudinal direction, and a pair of side wings 7, 7 on the left and right sides of the absorbent body 6 in the excretory portion opposing portion B, The left and right sides of the absorbent body 6 in the rear portion C have a pair of rear wing portions 8 and 8. Regarding the sanitary napkin 1 (absorbent article) or the absorbent body 6, the excretory part opposing part B is the central part of the width direction and the wearer's vaginal opening, that is, the body fluid excretion part, and the front part A is arranged at a relatively The excretory portion opposing portion B is closer to the front side (ventral side) of the wearer, and the rear portion B is disposed closer to the wearer's back side than the excretory portion opposing portion B.

The sanitary napkin 1 includes: a skin-side sheet 2 which forms a skin-facing surface facing the wearer's skin side when worn; a non-skin side sheet 3 which forms a non-skin opposing surface facing the garment side such as shorts when worn; And the absorber 4, which is arranged between the two sheets 2, 3. In addition, in this specification, the portion where the skin-side sheet 2, the non-skin-side sheet 3 and the absorbent core 40 overlap in a plan view is referred to as an absorbent body 6. In the sanitary napkin 1, the skin-side sheet 2 has a liquid-permeable front sheet 2a and a pair of side sheets 2b, 2b joined to both sides thereof. The liquid-permeable front sheet 2a is arranged at the center of the absorbent body 6 in the width direction Y so as to cover the entire length of the absorbent body 6. The side sheet 2b is joined to the side sheet 21 a slightly outside the width direction from the side edge 21 in a state where the side edge 21 at the center side in the width direction of the absorbent body is superposed on the front sheet 2a Front sheet 2a. In the sanitary napkin 1, the widthwise inner end of the side sheet 2b is not along the longitudinal direction and the front The sheets 2a are joined. In addition, in the sanitary napkin 1, the elastic member is not provided in the widthwise inner end of the side sheet 2b. However, an elastic member for body protection formation may be provided near the side edge portion 21, and when worn, the contraction force of the elastic member may cause the excretory portion opposing portion B to move from the side edge portion 21 The part with a certain width rises away from the front sheet 2a to form a three-dimensional shield.

The pair of side flaps 7 and 7 and the pair of rear flaps 8 and 8 include side sheets 2 b and non-skin side sheets 3 extending from both side edges of the absorber 4. On the surface of each of the pair of side wing parts 7 including the non-skin side sheet 3, there is provided a side wing part adhesive part (not shown) which is fixed to the non-skin opposite side of the crotch part of the shorts, and is not attached to the absorbent body 6 The opposite side of the skin is provided with a body adhesion part (not shown) for fixing the body 6 to the inner surface of the shorts. In the sanitary napkin 1, the body adhesive portion is provided at least in a region overlapping the lateral region of the absorbent core 40 described below in a plan view. The rear wing portion 8 is arranged on the inner 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 portions of the skin-side sheet 2 and the non-skin-side sheet 3 that extend to the outside of the peripheral edge of the absorber 4 are joined to each other with an adhesive, and are joined to the peripheral edge of the sanitary napkin 1 by heat sealing . The skin-side sheet 2 and the absorber 4 and the absorber 4 and the non-skin-side sheet 3 are joined to each other by an adhesive applied by patterns such as dots, spirals, and stripes. However, the surface of the absorbent body 4 on the non-muscle-contacting surface side is a region where the lateral region 45 of the absorbent core 40 described below is located, and has a non-bonded region that is not bonded to the non-skin side sheet.

The absorbent body 4 in the sanitary napkin 1 includes an absorbent core 40 having a longitudinally long shape that is long in the front and back directions of the sanitary napkin. The absorbent core 40 includes a fiber assembly containing fibrous materials such as pulp fibers, or one in which a super absorbent polymer is held between the fibers of the fiber assembly. In addition, the absorber 4 includes a chip-coated material (not shown) covering the absorbent core 40. That is, the absorptive core 40 is covered with the upper and lower surfaces by a core wrapping material (not shown) including toilet paper or water-permeable nonwoven fabric. The chip-coated material is used to prevent leakage of the forming material of the absorbent core 40 or to improve the shape retention of the absorbent core 40. The absorbent core 40 is preferably a piece of chip-wrapped material, The cross section in the width direction of the absorbent core 40 is covered over the entire circumference, or the cross section in the width direction of the absorbent core 40 is covered over the entire circumference by plural chips. Preferably, for example, both sides of a rectangular chip-coated sheet disposed on the skin-facing surface or non-skin-facing surface of the absorbent core 40 are folded back to the other surface side of the absorbent core 40 and stacked on On both sides of another rectangular chip package covering the other side of the rectangle. The sheets of the laminated part may not be joined, but it is also preferable to follow.

As shown in FIG. 1, the absorbent core 40 in the sanitary napkin 1 has a longitudinal shape that is longer in the same direction as the front and back directions of the sanitary napkin 1. Moreover, as shown in FIGS. 2(a) and 2(b), the absorbent core 40 has lateral regions 45, 45 on both sides in the width direction Y, and a central region with a thickness greater than the lateral regions 45, 45 of the central area 41. In the region B facing the body fluid discharge portion in the sanitary napkin 1, the central region 41 has the lower surface S2, S2 of the side regions 45, 45 respectively toward the non-skin side sheet 3 side, that is, in FIG. 2 The area of the central protrusion 5 protruding downward.

In the absorbent core 40, the lateral regions 45, 45 and the central region 41 are integrally formed.

In this specification, the so-called "integral molding" means that the members manufactured in different steps are combined with each other using bonding methods such as adhesive or compression, and the same material is used and formed integrally in one step. Therefore, there is no abutting portion or joint portion between the cores generated when the two absorbent cores manufactured separately are arranged side by side at the boundary between the central region 41 and the lateral regions 45, 45. In addition, in the sanitary napkin 1 of the present embodiment, the entire absorbent core 40 is integrally formed. Therefore, between the portion 42d of the central region 41 where the central protrusion 5 is formed and the portion 42u closer to the skin side than the portion 42d There is also no abutment or joint between the layers.

The manufacturing method of the absorbent core of such a structure is described below.

The ratio of the width W1 of the central protrusion 5 (see FIG. 2(a)) to the entire width W2 of the absorbent core 40 is preferably 20% or more, more preferably 30% or more, and preferably 80% or more. The lower limit is more preferably 70% or less, and further preferably 20% or more and 80% or less, and more preferably 30% or more and 70% or less. In addition, in the case where the length of the central protrusion 5 in the width direction is not fixed, for example, in the case of an oval or oblong shape, the width W1 of the central protrusion 5 refers to the longest length in the width direction The length of the part is compared with the width, and the entire width W2 of the absorbent core 40 is set to the entire width of the same position in the longitudinal direction of the absorbent core 40.

As shown in FIG. 1, the central protrusion 5 of the absorbent core 40 in the sanitary napkin 1 has a shape that is long in the longitudinal direction of the absorbent core 40, and extends from the opposing portion B of the discharge portion of the sanitary napkin 1 to the rear Part C is formed in part. More specifically, it is formed in the range from the vicinity of the front end portion of the excretory portion opposing portion B to the vicinity of the X direction central portion of the rear portion C.

The central protruding portion 5 is preferably formed in the front and back direction X of the sanitary napkin 1 (absorbent article), and extends over a part of the rear portion C from the discharge portion facing portion B. Further, the central protrusion 5 is preferably formed over a length of 30% or more of the entire length of the front and back direction X of the sanitary napkin 1, more preferably formed over a length of 40% or more of the entire length of the sanitary napkin 1, and further preferably It is formed over 50% of the total length of sanitary napkin 1. The same applies to the vertical groove 50 and the high-density portion 12 described below.

On the non-skin-facing surface of the central region 41 of the absorbent core 40, as shown in FIGS. 2(a) and 3, it is formed along the longitudinal direction X of the absorbent core 40 and has on the skin-facing surface side The bottom of the longitudinal groove 50. That is, the vertical groove 50 has an opening 50 a on the non-skin-facing side of the absorbent core 40 and is a groove that does not penetrate the absorbent core 40. In the sanitary napkin 1, the longitudinal groove 50 is formed by reducing the basis weight of the absorbent material of the absorbent core 40. That is, the longitudinal groove 50 of the sanitary napkin 1 is not formed by compressing a part of the absorbent core 40 by embossing or the like. In addition, in the sanitary napkin 1, the number of longitudinal grooves 50 provided in the central protrusion 5 is one, but the number of longitudinal grooves provided in the central protrusion 5 is not limited to this, and may be intermittent in the width direction Y To set multiple items. In the sanitary napkin 1, the vertical groove 50 is arranged so as to penetrate the central protrusion 5 in the longitudinal direction of the central protrusion 5.

In addition, in the central region 41 of the absorbent core 40, a horizontal groove 44a is formed in the same manner as the vertical groove 50. The horizontal groove 44a is formed by reducing the basis weight of the forming material of the absorbent core 40 and facing the skin The face side has a bottom. That is, the horizontal groove 44a is a groove that has an opening on the non-skin-facing surface side of the central region 41 and does not penetrate the absorbent core 40, like the vertical groove 50. The lateral groove 44a extends in the width direction Y of the absorbent core 40.

In the sanitary napkin 1 shown in FIG. 1, a plurality of lateral grooves 44 a are intermittently provided in the central region 41 in the longitudinal direction X. In the sanitary napkin 1, the lateral groove 44a is provided so as to traverse the central protrusion 5 along the width direction Y of the central protrusion 5.

In the central region 41 of the absorbent core 40, as shown in FIG. 2(a), the high basis weight portion 42 and the low basis weight portion 43 forming the bottom of the longitudinal groove 50 are alternated in the width direction Y of the absorbent core 40 The low basis weight portion 43 extends along the longitudinal direction X of the absorbent core 40. The high basis weight portion 42 is a relatively high basis weight of the forming material of the absorbent core compared with the low basis weight portion 43, and the low basis weight portion 43 is the basis weight and high basis weight of the forming material of the absorbent core The portion 42 is relatively low compared to the portion.

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

In the central region 41 of the absorbent core 40, the high basis weight portion 42 not only has a larger basis weight than the low basis weight portion 43 forming the bottom of the longitudinal groove 50, but also has a larger thickness than the low basis weight portion 43. Low basis weight 43 The ratio of the thickness to the thickness of the high basis weight portion 42 is preferably 5% or more, more preferably 10% or more, and more preferably 50% or less, more preferably 40% or less, and still more preferably 5% Above 50% and below, more preferably 10% and below 40%. The thickness of the high basis weight portion 42 is preferably 1.5 mm or more, more preferably 2 mm or more, and preferably 10 mm or less, more preferably 8 mm or less, and more preferably 1.5 mm or more and 10 mm or less, more preferably It is 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, and more preferably 5 mm or less, more preferably 4 mm or less, and further preferably 0.08 mm or more and 5 mm or less, more preferably 0.15mm or more and 4mm or less.

In addition, when the absorbent core is formed by including the lateral groove 44a like the sanitary napkin 1 of the present embodiment, the high basis weight portion excluding the lateral groove 44a only needs to conform to the value of the high basis weight portion 42 and Each value in the relationship of the low basis weight part 43 may be sufficient.

(Measurement method of basis weight of high basis weight part and low basis weight part)

A single-edged razor made by FEATHER was used to cut the absorbent core 40 along the boundary between the high basis weight 42 and the low basis weight 43 to obtain small pieces of the high basis weight 42 and the low basis weight 43. The portion sandwiched by the lateral region 45 and the low basis weight portion 43 of the high basis weight portion 42 or the portion sandwiched by the pair of low basis weight portions 43, 43 is cut into small pieces so as to become a predetermined area. In the case where the small piece includes the low basis weight portion 48 forming the bottom of the lateral groove 44a extending in the width direction Y, the high basis weight portion 42 and the lateral region 45, the low basis weight portion 43, or the low basis weight portion 48 will be The part surrounded by the boundary line is used for measurement by cutting the high basis weight portion 42 into small pieces. The small piece of the low basis weight part 43 cuts the narrow part between the pair of high basis weight parts 42 and 42 so that the length may become 30 mm. When a small piece with a length of 30 mm that does not include the intersection with the low basis weight portion 48 is not obtained as a small piece with the low basis weight portion 43, cut a length of 30 mm that contains as little as possible the intersection with the low basis weight portion 48 The small piece is used as a small piece of the low basis weight 43.

Use an electronic balance (Electronic Balance GR-300 manufactured by A&D, precision: 4 digits after the decimal point) to determine the weight of these small pieces. Divide the calculated weight by the high basis weight part 42 or the low basis weight The basis weight of the small piece is calculated by the area of the small piece of the weight 43. Regarding each of the high basis weight part 42 and the low basis weight part 43, the average basis weight of 5 small pieces is set as the basis weight.

(Measurement method of thickness of high basis weight part and low basis weight part)

The thickness of the high basis weight part 42 and the low basis weight part 43 is measured by measuring the thickness of the small piece cut out in order to measure the basis weight for each part. Place an acrylic plate with a size of 20mm×20mm and a thickness of 3mm in such a way that its center is consistent with the center of the small piece, and use the non-contact laser displacement meter (laser head LK-G30, displacement meter LK-GD500) manufactured by KEYENCE, Determine the thickness of the sample.

In addition, the pressure system at the time of thickness measurement was set to 0.5 g/cm ² . When the size of the cut piece is small and it is difficult to measure with a non-contact laser displacement meter, you can also use a microscope (VHX-1000 manufactured by KEYENCE) to observe the above Cut off the cross-section of the sample for measurement.

In the central region 41 of the absorbent core 40, the high basis weight portion 42 has a higher density of the absorbent member than the low basis weight portion 43 forming the bottom of the vertical groove 50. Such a configuration is obtained, for example, by pressurizing the central region 41 of the absorbent core 40 in the step of manufacturing the absorbent core 40. At this time, the pressurized pressure is concentrated on the high basis weight portion 42 with a thick thickness, and the low basis weight portion 43 with a thin thickness is not pressurized due to the pressurization and is not compressed. In this way, only the high basis weight portion 42 is compressed, thereby designing the high basis weight portion 42 such that the density of the absorbing member is increased relative to the low basis weight portion 43. In the central region 41 of the absorbent core 40, the high basis weight portion 42 and the low basis weight portion 48 forming the bottom of the lateral groove 44a are alternately formed along the longitudinal direction X of the absorbent core 40. The high basis weight portion 42 has a higher density of the absorbing member than the low basis weight portion 48 forming the bottom of the lateral groove 44a. In addition, the density is calculated by using the basis weight and thickness obtained based on the above measurement method.

The basis weight and thickness of the low basis weight portion 48 are measured by cutting out small pieces by the same method as in the case of the low basis weight portion 43. The small piece of the low basis weight part 48 cuts the narrow part between the pair of high basis weight parts 42 and 42 so that the length may become 30 mm. Yu did not get not included and low In the case of a small piece with a length of 30 mm at the intersection of the basis weight portion 43, a small piece with a length of 30 mm that contains a small amount of the intersection with the low basis weight portion 43 is cut out and used as a small piece for the low basis weight portion 48. The above-mentioned preferred basis weight ratio, thickness ratio, etc. of the high basis weight portion 42 and the low basis weight portion 43 are also the same between the high basis weight portion 42 and the low basis weight portion 48.

Moreover, the high basis weight portion 42 and the low basis weight portion 43 having the basis weight difference and the density difference are formed in the above-described manner, whereby the non-skin-facing surface in the central region 41 of the absorbent core 40 is oriented The longitudinal grooves 50 recessed on the opposite side of the skin are formed to extend in the longitudinal direction X of the absorbent core 40.

In this specification, the skin-facing surface of the absorbent article or its constituent member faces the skin side of the wearer when worn, and the non-skin-facing surface of the absorbent article or its constituent member faces the wearing article The side opposite to the wearer's skin.

Also, in the lateral region 45 of the absorbent core 40, as shown in FIG. 2(a), the high basis weight portions 46 and the low basis weight portions 47 are formed alternately in the width direction Y of the absorbent core 40, Each low basis weight portion 47 extends along the longitudinal direction X of the absorbent core 40. Compared with the low basis weight part 47, the high basis weight part 46 has a relatively high basis weight of the forming material of the absorbent core, and the low basis weight part 47 has a relatively high basis weight part 46, and the forming material of the absorbent core The basis weight is relatively low.

In addition, the high basis weight portion 46 and the low basis weight portion 47 having the basis weight difference and the density difference are formed in the above-described manner, whereby the non-skin facing surface in the lateral region 45 of the absorbent core 40, A plurality of lateral longitudinal grooves 52 recessed toward the opposite side of the skin are also formed along the longitudinal direction X of the absorbent core 40.

In the lateral region 45 of the absorbent core 40, the high basis weight portion 46 has a higher density of the absorbent member than the low basis weight portion 47 forming the bottom of the vertical groove 52. Such a configuration can be obtained as follows. The lateral region 45 of the absorbent core 40 is pressurized in a step different from the step of pressurizing the central region 41. The pressurized pressure is concentrated on the thicker high basis weight portion 46, and the thinner low basis weight portion 47 is not pressurized by the pressurization and is not compressed. In this way, only the high basis weight portion 46 is compressed, thereby absorbing the member relative to the low basis weight portion 47 The high basis weight 46 is designed in such a way that the density is increased. Furthermore, the pressing step used in this step is managed in such a way that the pressing roller dug into a shape corresponding to the central area 41 or only the lateral area corresponding to the absorbent core 40 is used The part of 45 has a process such as a roller of a pressurizing part, and pressurizes only the lateral region of the absorbent core 40.

In the lateral region 45 of the absorbent core 40, the ratio of the basis weight of the low basis weight portion 47 forming the bottom of the side longitudinal groove 52 to the basis weight of the high basis weight portion 46 is preferably 5% or more, more It is preferably 10% or more, and preferably 50% or less, more preferably 40% or less, and further preferably 5% or more and 50% or less, more preferably 10% or more and 40% or less. In addition, 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, and further preferably 400 g/m ² or less, more preferably 300 g/m ² or less, and, It is preferably 50 g/m ² or more and 400 g/m ² or less, and 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, and more preferably 200 g/m ² or less, more preferably 150 g/m ² or less, and It is preferably 2.5 g/m ² or more and 200 g/m ² or less, and more preferably 5 g/m ² or more and 150 g/m ² or less.

In the lateral region 45 of the absorbent core 40, the high basis weight portion 46 not only has a larger basis weight than the low basis weight portion 47 forming the bottom of the lateral longitudinal groove 52, but also has a larger thickness than the low basis weight portion 47. 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, and preferably 50% or less, more preferably 40% or less, and, It is preferably 5% or more and 50% or less, and more preferably 10% or more and 40% or less. In addition, the thickness of the high basis weight portion 46 is preferably 0.8 mm or more, more preferably 1 mm or more, and more preferably 5 mm or less, more preferably 4 mm or less, and 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, and more 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.

Furthermore, when the absorbent core is formed by including the lateral groove 44b like the sanitary napkin 1 of the present embodiment, the high basis weight portion excluding the lateral groove 44b only needs to meet the above-mentioned high basis weight portion The value of 46 and each value in the relationship with the low basis weight part 47 are sufficient.

In addition, the measurement method of the basis weight and thickness of each of the high basis weight part 46 and the low basis weight part 47 is performed similarly to the measurement method of the high basis weight part 42 and the low basis weight part 43 mentioned above.

In addition, the high basis weight portion 42 in the central area 41 where the central protrusion 5 is located has a larger basis weight than the high basis weight portion 46 of the side area 45, and is higher than the high basis weight portion 46 of the side area 45 In comparison, the thickness also becomes larger. As a result, the thickness t1 of the central region 41 is thicker than the thickness t2 of the lateral region 45. In the central region 41, the central protruding portion 5 protruding lower than the lower surface S2 of the lateral region 45 is formed.

The ratio of the thickness t1 of the central region 41 to the thickness t2 of the lateral region 45 is preferably 110% or more, more preferably 120% or more, and preferably 400% or less, more preferably 300% or less, and It is preferably 110% or more and 400% or less, and more preferably 120% or more and 300% or less. Furthermore, in the present embodiment, the thickness t1 of the central region 41 is the thickness of the high basis weight portion 42 located at the central portion in the width direction of the central region 41, and the thickness t2 of the lateral region 45 is the height closest to the central region 41 The aforementioned thickness of the base weight portion 46. In the case where the protrusion is adjacent to the high-density portion 12 in the lateral region 45, the thickness of the high basis weight portion 46 closest to the protrusion is adjacent to the high-density portion 12.

Regarding the central protruding portion 5, the ratio of the height t of each of the drain portion facing portion B and the rear portion C protruding from the lower surface S2 of the lateral region 45 relative to the entire thickness t1 of the central region 41 is better 20% or more, more preferably 30% or more, and preferably 90% or less, more preferably 80% or less, and more preferably 20% or more and 90% or less, more preferably 30% or more and 80% the following. The protrusion height t of the central protrusion 5 is the same as the value obtained by subtracting the thickness t2 of the lateral region 45 from the entire thickness t1 of the central region 41.

In the sanitary napkin 1, in the lateral region 45, the high basis weight portions 46 and the low basis weight portions 49 are also formed alternately in the longitudinal direction X of the absorbent core 40, and each low basis weight portion 49 is also along the absorbent core The width direction Y of the body 40 extends. As a result, in the lateral region 45, a plurality of lateral grooves 44b are intermittently arranged in the longitudinal direction X. Of the low basis weight 48 of the central area 41 and the lateral area 45 The low basis weight portion 49 is located at the boundary between the central region 41 and the lateral region 45, and the position of the absorbent core 40 in the longitudinal direction X is the same. Similarly, the lateral groove 44a of the central region 41 and the lateral regions 45, 45 The transverse groove 44b is aligned at the boundary portion in the longitudinal direction X of the absorbent core 40.

That is, the lateral groove 44 a of the central region 41 and the lateral groove 44 b of the side regions 45 and 45 are formed when the absorbent core 40 is viewed from the non-skin-facing side, and the central region 41 formed from the absorbent core 40 extends over the side One transverse groove 44 continuous in the square areas 45 and 45 extends across the entire width of the absorbent core 40. In addition, a plurality of lateral grooves 44 are formed at intervals in the longitudinal direction of the absorbent core 40. In other words, the low basis weight portion 48 of the central region 41 and the low basis weight portion 49 of the lateral region 45 form a low basis weight portion that continuously extends over the entire width of the absorbent core 40, the absorption of the one low basis weight portion The basis weight, thickness and density of the forming material of the sexual core are smaller than the high basis weight portion 46 of the lateral region 45.

With regard to the lateral groove 44, the continuous area from the central area to the lateral area means that when the absorbent core 40 is viewed from the non-skin-facing side, the lateral groove is not interrupted between the central area and the lateral area, but from the central area It exists continuously throughout the lateral area. In the sanitary napkin 1 of the present embodiment, the horizontal groove 44 and the vertical groove 50 cross in a cross shape when viewed from above, but there is another horizontal direction in the extension of the space in the horizontal groove on the opposite side across the vertical groove In the case of all or part of the space in the groove, the horizontal groove is not interrupted at the intersection with the vertical groove.

The absorbent body 4 in the sanitary napkin 1 has a region 45 ′ where the lateral region 45 of the absorbent core 40 is located in a plan view (hereinafter also referred to as the lateral region 45 ′ of the absorbent body) has no bonding to the non-skin side sheet 3 Non-bonded area. On the other hand, the absorber 4 is joined to the non-skin side sheet 3 in a region 41' where the central protrusion 5 of the absorbent core 40 is located in a plan view (hereinafter also referred to as a central region 41' of the absorber). Therefore, as shown in FIG. 2( a ), a space is formed between the absorbent core 40 and the non-skin side sheet 3 in the lateral region 45 ′ of the absorber 4. In the case where the absorbent core 40 is covered with the core wrapping material, the space can be formed between the absorbent core and the core wrapping material, or between the core wrapping material and the non-skin side sheet 3 Better to package chips A space is formed with the non-skin side sheet 3. In this case, the absorbent core 40 and the chip-coated material may or may not be adhered. The surface of the absorbent core 40 on the non-skin-facing side may be adhered to the chip-coated material using the pattern-applied adhesive throughout the entire area. In addition, the surface of the absorbent core 40 on the muscle abutting surface side may be adhered to the chip-coated material with the pattern-coated adhesive throughout the entire area.

In the sanitary napkin 1, there is a non-joint region throughout the widthwise region of the lateral region 45' of the absorber 4 located outside the width direction in the region where the central protrusion 5 is located. In FIG. 2(a), the side The square area 45' overlaps with the non-joint area. However, it is not limited to this, and a part of the region 45 ′ where the side region 45 is located when the absorber 4 is viewed in plan may be joined to the non-skin side sheet 3. For example, a form in which only the position of the edge in the width direction of the absorbent core 40 is joined to the non-skin side sheet and the like. In addition, it may be a form in which only the entire region located on the side region 45' of the excretory part opposing part B is a non-bonding region, and the side region 45' of the absorber 4 is provided in the front part A or the rear part C The part obtained by joining the non-skin side sheet 3. In addition, when the central protrusion 5 is in an oblong shape or other shape with a non-uniform width, it may be located on the inner side in the width direction in front of or behind the longitudinal direction of the maximum width of the central protrusion 5 The square region 45', the side region 45' of the absorber 4 is joined to the non-skin side sheet 3, and a non-joined region is formed outside the imaginary line extending from the maximum width portion in the longitudinal direction X . However, it is preferable that at least the entire region of the region 45 ′ where the lateral region 45 of the body fluid discharge part opposing region B is located is not joined to the non-skin side sheet 3.

In the absorbent article of the present invention, the absorbent core 40 is formed integrally with the central region 41 and the lateral region 45, and the central protrusion 5 of the relatively thick central region 41 protrudes toward the non-skin side sheet 3 side. In addition, a side region 45 ′ of the absorber 4 located on the outer side in the width direction than the central protrusion 5 is provided with a non-joined region that is not joined between the absorber 4 and the non-skin side sheet 3. Therefore, unique effects as described below can be obtained.

First, when the wearer wears the absorbent article of the present invention, the row of absorbent articles The surrounding part of the vent part will be deformed in a way that follows the shape of the body. At this time, by the central protruding portion 5 protruding away from the wearer's skin, the surrounding portion has a pressure buffering area or space on the non-skin-facing side. Therefore, the lateral regions 45', 45' of the absorber 4 have a cushioning region between the crotch portion and the central region 41' and are bent, so that a deformed shape with excellent cushioning properties can be formed (see FIG. 5).

In the sanitary napkin 1 shown in FIG. 2( a ), the pressure buffering area is the space formed between the side area 45 ′ of the absorber 4 and the non-skin side sheet 3. In particular, when a force is applied from the skin-facing surface side to the non-skin-facing surface side when wearing the sanitary napkin 1, although the side area 45' is curved and moved toward the non-skin-facing surface direction, the side The area adjacent to the central protrusion 5 in the square area 45 ′ can easily maintain the space between the side area 45 ′ and the non-skin side sheet 3. In addition, in the sanitary napkin 1 of the present embodiment, furthermore, vertical grooves and lateral grooves are formed in the central region 41 and the lateral regions 45 of the absorbent core 40, and the pressure applied from the product width direction can be further relaxed.

In addition, the buffer area can be formed in such a way as to maintain the space between the central protrusion 5 and the lateral area 45', so that a ventilation passage is formed in the area adjacent to the central area 41 which has a large absorption capacity and holds a large amount of excretion liquid, and Can reduce the feeling of stuffiness.

Furthermore, the central protrusion 5 protruding toward the skin-side sheet 3 side functions as a cushion, even after the excretory fluid is absorbed by the absorbent article, for example, from the skin-facing side to the non-muscle-facing direction, The pressure is applied to the absorbent article from the wearer's body fluid excretion part, which can also bear the pressure softly, and the space for the central protrusion 5 to expand can be ensured by the above-mentioned buffer area, so it can give the wearer a soft wearing feeling And, the leakage of excretory fluid from the central protrusion 5 can be suppressed.

These effects can bring a gentle touch to or near the sensitive vaginal opening when the absorbent article is a sanitary napkin, so it can be said to be particularly good. In addition, in the case where the non-skin side sheet 3 has an absorbent article with a fixing mechanism to panties or the like, there is a non-joining area between the side area 45 and the non-skin side sheet 3, so the absorbent core 40 Not vulnerable The effects of wrinkles or wrinkles in underwear, etc., so the advantages of the above effects are outstanding. The advantage of this effect is particularly advantageous when the above-mentioned fixing mechanism is provided on the non-skin abutment surface in the lateral portion of the non-skin side sheet facing portion.

In addition, the absorbent core 40 of the sanitary napkin 1 of the present embodiment has a protrusion adjacent to the high-density portion 12, the protrusion adjacent to the high-density portion 12 and the side regions 45, 45 adjacent to the central region 41 and The density is higher than the central area 41. In comparison with the high basis weight portion 42 without longitudinal grooves and lateral grooves in the central region 41 and the protruding portion adjacent to the high density portion 12, regarding the density of all constituent materials such as fibers and absorbent polymers forming the absorbent core , Meaning that the high basis weight portion 42 has a relatively lower density than the protrusion portion adjoins the high density portion 12.

In the sanitary napkin 1, further, the lateral region 45 having a lower basis weight and lower density than the protrusion adjacent high density portion 12 is arranged more outward in the width direction than the protrusion adjacent high density portion 12 .

In the case where the protrusion is adjacent to the high-density portion 12 by the method shown in FIG. 4, the density on the non-skin opposite surface side is higher than the density on the skin opposite surface side, but the density of the protrusion portion adjacent to the high-density portion 12 is The whole thickness direction of the absorbent core was cut out and measured.

The density of the protruding portion adjacent to the high-density portion 12 is 110% or more, preferably 120% or more, and preferably 400% or less with respect to the density of the high basis weight portion 42 without longitudinal grooves and transverse grooves in the central region 41 It is more preferably 300% or less, and is preferably 110% or more and 400% or less, and more preferably 120% or more and 300% or less.

In addition, the density of the protruding portion adjacent to the high-density portion 12 is 150% or more, preferably 160% or more, and preferably 500% or less, more preferably 400% or less, relative to the density of the lateral region 45. It is preferably 150% or more and 500% or less, and more preferably 160% or more and 400% or less.

[Calculation method of density in the central area]

In the absorbent core 40, a single-edged razor manufactured by FEATHER Corporation was used to cut the product in a width direction of 3 mm and in the product length direction so as to become a predetermined area. It is a test piece with a size of 30mm. First, cut the test piece of the high basis weight portion 42 without longitudinal grooves and lateral grooves in the central area 41, and measure its mass using an electronic balance (Electronic Balance GR-300 manufactured by A&D Corporation, accuracy: 4 decimal places) . Next, for example, a microscope (KEYENCE Corporation VHX-1000) is used to observe the cross section of the cut sample at a magnification of 20 to 100 times, and the thickness is measured. In addition, the measured test piece was set to five, and the average value was set to the thickness of the central region. The mass measured above is divided by the volume of the test piece (thickness × length in the product width direction × length in the product length direction) to calculate the density in the central region.

[Calculation method of density of protruding portion adjacent to high-density portion]

A plurality of test pieces with a width of 3 mm in the width direction of the product and a length of 30 mm in the length direction of the product are continuously cut from the center of the product in the width direction of the absorbent article (product) to the end of the product, and an electronic balance (A&D Corporation) is used. The manufactured electronic balance GR-300, accuracy: 4 digits after the decimal point) determines its quality. Next, use a microscope (VHX-1000 manufactured by KEYENCE) to observe the cross section of the cut sample at a magnification of 20 to 100 times, and measure the thickness.

In addition, each cut test piece was cut from 5 absorbent articles, the measured test piece was set to the same position of each of the 5 absorbent cores 40, and the average value was set to the thickness of the test piece. The mass measured above is divided by the volume of the test piece (thickness × length in the product width direction × length in the product length direction) to calculate the density of the test piece cut from each part.

Regarding the obtained test pieces, based on the test pieces cut from the center side of the product, the test pieces on the center side in the width direction of the product and the test pieces cut from the portion adjacent to the outer side in the width direction of the test piece are calculated in order. The density ratio (the former/the latter), when the density ratio becomes 0.5 or less, the density of the test piece on the outer side in the product width direction of the two test pieces is taken as the density of the protrusion adjacent to the high density portion 12.

In the sanitary napkin 1 of the present embodiment, as shown in FIG. 4, the protruding portion adjacent to the high-density portion 12 is formed into a high basis weight portion in the central region 41 of the absorbent core 40 when manufacturing the sanitary napkin The 42 part 42' is formed by compressing both sides 12' in the width direction of the same thickness. Since the central region 41 has such a structure, the following effects are exhibited.

First of all, for the deformation when the pressure from the wearer is applied to the opposing portion of the excretory portion, the protrusion adjacent to the high-density portion 12 has resistance to deformation, so the side region 45 of the absorbent core 40 easily faces the central protrusion 5 The space is deformed while maintaining the space with the lateral region 45. Therefore, the effects of the present invention described above can be more easily achieved.

In addition, this configuration is also advantageous for absorption performance. First, the body fluid is discharged to the central protruding portion 5 of the central area 41 in the excretory portion facing portion B. At the side portion of the central region 41, there is a protrusion formed by compressing the central protruding portion 5 adjacent to the high-density portion 12. Therefore, the body fluid diffused in the width direction Y and the thickness direction is guided to the high-density portion. The protrusion portion adjacent to the high-density portion 12 has a higher basis weight of the absorbent material than the lateral region 45, and therefore has a higher ability to retain body fluids. Therefore, body fluid is blocked on both sides of the central region 41, and it is difficult to reach both sides of the sanitary napkin 1 in the width direction. Therefore, in the sanitary napkin 1, it is easy to suppress leakage of body fluid.

The protrusion portion adjacent to the high-density portion 12 will be described more specifically.

The protruding portion in the sanitary napkin 1 is adjacent to the high-density portion 12 after the absorbent core 40A shown in FIG. 4(a) is manufactured using the fiber accumulation device shown in FIG. 6, and then the absorbent core 40A When both sides of the central thick-walled region 41' are compressed and formed, the absorbent core 40A has a thick central thick-walled region 41' including a portion 12' that becomes a protruding portion adjacent to the high-density portion 12. In the sanitary napkin 1, the fixed portions of the central thick-walled area 41' located on the left and right sides of the portion that becomes the central protrusion are compressed to thereby reduce the thickness, and the portion is formed with a protrusion adjacent to the high-density portion 12 As a region with a density higher than the uncompressed central protrusion 5. In addition, the protruding portion adjoining the high-density portion 12 has a higher basis weight than the other parts of the lateral region 45, and therefore has a sufficient absorption capacity, so that body fluids are prevented from reaching the side edges of the absorbent core 40. Therefore, it is easy to prevent body fluid from leaking from the side of the sanitary napkin 1. In the sanitary napkin 1 of the present embodiment, the protrusion portion adjacent to the high-density portion 12 has substantially the same thickness as the portion of the lateral region 45 where the vertical groove 52 and the horizontal groove 44 do not exist, but it is not limited to this, and may also be a protrusion The thickness of the portion adjacent to the high-density portion 12 is thinner than the central protrusion 5, But it is thicker than the lateral area 45.

In addition, in the sanitary napkin 1, the longitudinal groove 50 of the central protrusion 5 has a narrower width in the width direction of the bottom 50b than the opening 50a. More specifically, as shown in FIG. 2(a) and FIG. 2(b), the length of the longitudinal groove 50 of the central protrusion 5 in the width direction gradually narrows from the opening 50a toward the bottom 50b, in the width direction In the cross-sectional view, the vertical groove 50 has a substantially inverted V shape from the non-skin facing surface side toward the skin facing surface side. In addition to this form, it may also have a stepped cross-sectional shape, but when a substantially inverted V shape is applied with pressure from both outer sides in the width direction, the non-skin-facing surface of the central region 41 is greatly deformed and the skin is facing The amount of surface deformation is small, so that the absorption area at the opposite part of the excretory part is not reduced, and a soft feeling can be obtained. This effect is particularly effective when the protrusions are adjacent to the high-density portion 12.

The width direction length La of the opening 50a of the longitudinal groove 50 of the central protrusion 5 is preferably 0.5 mm or more, more preferably 1 mm or more, and further preferably 5 mm or less, further preferably 4 mm or less, and the width of the bottom 50 b The length Lb in the direction is preferably 1 mm or less, and more preferably 0.5 mm or less. The lower limit of the width direction length Lb of the bottom portion 50b is 0 (zero).

In addition, the depth of the vertical groove 50 is preferably 0.5 mm or more and 5.0 mm or less, and more preferably 1.0 mm or more and 3.0 mm or less. In addition, the difference between the widthwise length of the opening 50a and the bottom 50b of the vertical groove 50 (the above-mentioned La-the above-mentioned Lb) is preferably 0.5 mm or more and 3 mm or less, and more preferably 1 mm or more and 2 mm or less.

In addition, the ratio of the depth of the vertical groove 50 to the difference in the width direction of the opening 50a and the bottom 50b (the aforementioned La-above Lb) (depth/difference (above La-above Lb)) is preferably 0.5 or more and 20 or less It is further preferably 1 or more and 10 or less. Within this range, the shape of the longitudinal groove during wearing is easily stabilized, and it is easy to maintain a preferable shape for absorbing excreta.

The bottom 50b of the vertical groove 50 is located below the lower surface S2 of the lateral region 45. The position of the lower surface S2 of the lateral region 45 mentioned here is the lower surface of the high basis weight portion 46 in the portion of the lateral region 45 adjacent to the central region 41. The bottom 50b of the longitudinal groove 50 is preferably The longitudinal direction X of the absorbent core 40 extends over the entire area of the central region 41 and is located below the lower surface S2 of the lateral region 45. With such a structure, it is easy to suppress excessive deformation of the sanitary napkin when worn, and it is easy to bring a moderate sense of fit.

Furthermore, each of the central region 41 and the lateral region 45 of the absorbent core 40 has a concave and convex shape due to the presence of horizontal grooves and vertical grooves, on the other hand, the skin is opposed The surface is flat.

According to the sanitary napkin 1 of the present embodiment, a lateral groove 44 is formed in the central region 41 having the central protrusion 5. The lateral groove 44 has a shallow depth, and the bottom 44 d reaches the surface S2 closer to the non-skin than the lower surface S2 of the lateral region 45. The lateral position, and also extends from the central region 41 to the lateral region 45, and the lateral groove 44 is formed by reducing the basis weight of the absorbent core forming material, so although there is a central protrusion that is often easy to hinder bending 5. However, it is very deformable, and it is not easy to wrinkle on the opposite side of the skin of the sanitary napkin 1. Therefore, as shown in FIG. 5, the absorbent body 4 and the non-skin-facing side of the sanitary napkin 1 containing the same can follow the wearer’s body fluid excretion or hip groove, while the overall shape can follow the wearer’s body shape. The deformation is excellent in conformity to the irregularities of the body, and it is excellent in deformability to follow the wearer's activities, and it is not easy to bring discomfort caused by wrinkles or bending of the absorbent core.

This effect is further improved when the bottom 44d of the lateral groove 44 is located below the lower surface S2 of the lateral region 45 over the entire area of the central region 41 in the width direction Y of the absorbent core 40.

From the viewpoint of more surely exerting this effect, the ratio of the depth of the lateral groove 44a (44) of the central region 41 to the thickness t1 of the central region 41 is preferably 50% or more, more preferably 60% or more, and It is preferably 95% or less, more preferably 90% or less, and preferably 50% or more and 95% or more, more preferably 60% or more and 90% or less.

The width W of the lateral groove 44 is preferably 0.2 mm or more, more preferably 0.5 mm or more, and preferably 3 mm or less, more preferably 2 mm or less, and more preferably 0.2 mm or more and 3 mm or less, more preferably 0.5 mm or more and 2 mm or less. As shown in FIG. 1, the width W of the lateral groove 44 is the dimension in the longitudinal direction X of the absorbent core.

Moreover, in the sanitary napkin 1, the density of the high basis weight portion 42 of the central region 41 is higher than that of the low basis weight portion 43, so the body fluid absorbed through the lateral groove 44 is quickly absorbed to the high basis weight portion 42. Therefore, the body fluid is absorbed along the transverse groove 44 while being absorbed in the longitudinal direction of the absorbent core 40, so that the body fluid in the central region 41 can be efficiently absorbed. As a result, the suppression of liquid leakage from the absorbent core 40 is improved. In addition, in the lateral region 45, the density of the high basis weight portion 46 is also higher than that of the low basis weight portion 47, so the same effect can be obtained.

In each of the central area 41 and the lateral area 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 more preferably 50% or less, more preferably 40% or less, and preferably 5% or more and 50% or less, more preferably 10% or more and 40% or less.

In addition, in the sanitary napkin 1, a lateral longitudinal groove 52 extending in the longitudinal direction is also provided in the lateral region 45. With regard to the lateral longitudinal groove 52, the opening 52a on the non-skin-facing side and the bottom 52b on the skin-facing side have substantially the same length in the width direction Y. Here, "substantially the same" means that the difference between the widthwise length of the opening and the bottom at the same position in the longitudinal direction is within 5%. With this configuration, the compressive force received by the sanitary napkin 1 from the user's leg during wearing is uniformly transmitted to the lateral longitudinal groove 52 to uniformly compress the lateral longitudinal groove 52, so the user's sanitary napkin can be eased 1 The reaction of the compression force received can eliminate the discomfort felt by the user when wearing the sanitary napkin 1. In addition, if the opening 52a of the side longitudinal groove 52 is configured to be more enlarged than the bottom 52b, the opening of the sanitary napkin 1 is greatly increased due to the compressive force received from the user's leg base during wearing Because of the deformation, the side edge of the sanitary napkin 1 may be deformed by curling toward the user. This deformation is because the side edge of the sanitary napkin 1 warps toward the user's skin, so there is a strong contact between the sanitary napkin 1 and the groin or the user's skin and the surface of the sanitary napkin 1 in the center of the sanitary napkin 1 The occurrence of intervals. However, by making the length of the opening 52a and the bottom 52b in the width direction substantially the same, Can reduce the risk of such undesirable situations. Moreover, it also contributes to the stability of the shape of the longitudinal groove 50 of the central region 41 in the present invention.

The lateral longitudinal groove 52 is preferably adjacent to the protruding portion adjacent to the high-density portion 12. With this configuration, the hardness of the absorbent core 40 in contact with the lateral side of the lateral longitudinal groove 52 and the absorbent core 40 in contact with the center side of the lateral longitudinal groove 52 are different, and according to the difference in hardness, The sanitary napkin 1 easily bends the side edge portion in the opposite direction to the user's skin using the lateral longitudinal groove 52 as the base axis, so that the shape of the sanitary napkin 1 being worn is more stable, thereby reducing the risk of wearing the sanitary napkin 1 It makes the user feel uncomfortable, and makes the central part of the sanitary napkin 1 more closely adhere to the user's skin, and can absorb liquid more efficiently. In addition, by adjoining the high-density portion, which is responsible for absorbing and capturing the liquid, to the side longitudinal groove 52 having a relatively low density, the following effect is exerted: preventing the liquid from leaking to the higher-density portion to the side, making The liquid is fixed in an area closer to the central area of the sanitary napkin 1 to prevent the liquid from leaking from the side edge of the sanitary napkin 1.

It is preferable that the bottom surface 50a of the longitudinal groove 50 of the central region 41 is located closer to the non-skin-facing surface side than the bottom surface 52a of the lateral longitudinal groove 52. With this configuration, first, the longitudinal groove 50 whose bottom surface is located on the side opposite the non-skin opposite surface is the base axis, and the side portion of the sanitary napkin 1 is bent in the opposite direction to the user's skin. Second, the bottom surface is located The lateral longitudinal groove 52 on the side opposite to the skin is the base axis, and the lateral portion of the sanitary napkin 1 is bent in the opposite direction to the user's skin, so that the shape of the sanitary napkin 1 being worn can be more stable.

The absorbent core 40 of the sanitary napkin 1 can be manufactured by, for example, manufacturing the absorbent core 40A using the fiber stacking device 53 (see FIG. 6) and then performing the processing shown in FIG. 4. The fiber stacking device 53 includes : The fiber accumulation cylinder 54 is provided with an accumulation recess 55 on the outer circumferential surface and rotates in one direction R; and the duct 59 supplies the forming material of the absorbent core to the outer circumferential surface of the fiber accumulation cylinder 54 in a flying state. In FIG. 4, the case where the absorptive core 40A which has the central thick-walled region 41' in the center part of the direction CD orthogonal to the conveyance direction MD is introduced to the pressure roller which has the recessed part 62 in a part of the peripheral surface Between 61 and the smoothing roller 63 with a smooth peripheral surface, it is strongly adjacent to the portion that becomes the central area 41 The contacted portion 12' is pressurized to form an absorbent core 40 having a protrusion adjacent to the high-density portion 12. FIG. 4 shows a case where the portion forming the central protrusion 5 that becomes the central region 41 is not pressurized, but any one of the portion that becomes the central region 41 and the portion that becomes the lateral region 45 or Both of them are pressurized and compressed more weakly than the portion 12 ′ where the protruding portion is adjacent to the high-density portion 12.

A plurality of concave portions 55 for accumulation in the fiber accumulation device 53 shown in FIG. 6 are formed at a fixed interval along the circumferential direction of the outer circumferential surface of the fiber accumulation tube 54. The bottom surface 56 of the recess 55 for accumulation includes a mesh plate and the like, and has a plurality of micropores that function as suction holes.

As shown in FIG. 7(a), a recess 56a for forming a central thick-walled region 41' is formed in a part of the bottom surface 56 of the recess 55 for accumulation. At the bottom of the recess 55 for accumulation, the hard-to-air-permeable members 57 and 58 for forming low basis weight parts, such as low basis weight parts 43 and 48, are arrange|positioned. The gas-impermeable members 57 and 58 are fixed in such a manner as to protrude from the bottom surface of the recess 55 for accumulation, and may be either a non-breathable member or may include, for example, metal or plastic.

Similar to a known fiber stacking device equipped with a fiber stacking cylinder, by sucking from the bottom surface of the recess 55 for collecting, the material for forming the absorbent core inside the duct is supplied as shown in FIG. 7(b) , The forming material of the absorbent core is deposited in the concave portion 55 for accumulation in a specific shape. By releasing this deposit 4'from the recess 55 for accumulation, the absorbent core 40A is obtained. The absorbent core 40A may be compressed and moderately compressed by being passed between a pair of rollers or the like before or after being coated with the chip wrapping material. As shown in FIG. 7(b), the portion including the core forming material deposited on the hardly breathable members 57 and 58 becomes the low basis weight portion 43 and the like, and is deposited on the bottom surface of the hardly breathable members 57 and 58 Part becomes the high basis weight part 42 etc. Also, as described above, by pressurizing the central region 41 of the absorbent core 40A, a high basis weight portion 42 having a density higher than the low basis weight portion 43 is formed in the central region 41, and becomes the central region 41 by The portion separately pressurizes the side area 45, and a high basis weight portion 46 having a density higher than the low basis weight portion 47 is formed in the side area 45. In addition, a protrusion may be formed in the central thick-walled region 41' of the absorbent core 40A before or after being coated with the chip-coated material The starting portion is adjacent to the pressurization (compression) of the high-density portion 12. The pressure (compression) forming the protruding portion adjacent to the high-density portion 12 may be performed simultaneously with the pressure of the roller having a step difference on the peripheral surface and the central region 41 or the pressure of the lateral region 45. In addition, by designing the step formed on the roller peripheral surface to an appropriate size, it is also possible to perform the pressing with the central region 41 and the lateral region 45 simultaneously. Furthermore, the pressurization of the central region 41 and the lateral region 45 may be performed in different steps, or before the pressurization of the central region 41, during the pressurization of the central region 41 and the lateral region 45 After the pressurization of the side area 45, the pressurization is performed in different steps. In the case of manufacturing an absorbent core containing a water-absorbing polymer, it is preferable to provide an introduction portion of the water-absorbing polymer in the middle of the catheter.

As the front sheet 2a and the non-skin side sheet 3, the same ones as those previously used in this technical field can be used without particular limitation. For example, as the front sheet 2a, a non-woven fabric or a perforated film having liquid permeability can be used. As the non-skin side sheet 3, a liquid-impermeable nonwoven fabric such as a liquid-impermeable film made of synthetic resin or a spunbond-meltblown-spunbond laminated nonwoven fabric with high water pressure resistance can be used. In addition, as the side sheet 2b, a water-repellent nonwoven fabric with high water pressure resistance, such as a spunbond-meltblown-spunbond laminated nonwoven fabric, can be used.

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

For example, in the lateral region 45, either or both of the lateral lateral groove 44b and the lateral longitudinal groove 52 may not be present. In addition, either or both of the lateral lateral groove 44b and the lateral longitudinal groove 52 may be formed on the skin-facing side of the absorbent core 40.

In addition, the lateral groove 44 continuous from the central region 41 to the lateral region 45 may be formed only at the opposing part of the excretion part of the absorbent article, or may be formed only at the rear part.

In addition, the absorbent core may include only fibrous materials such as pulp fibers, or both fibrous materials and super absorbent polymers. As the fiber material, various fiber materials previously used in the absorbent body for absorbent articles such as menstrual pads, sanitary pads, disposable diapers, etc. can be used without limitation, for example, pulp fibers, rayon fibers, cotton fibers, and other fibers can be used Short fibers of plain fibers, short fibers of synthetic fibers such as polyethylene, etc. These fibers can be used alone or in combination of two or more. In addition, the fiber material is preferably pulp fiber in whole or in part, and the ratio of pulp fibers in the fiber material is preferably 50 to 100% by mass, more preferably 80 to 100% by mass, and further preferably 100% by mass. In addition, for the absorbent core, in addition to the superabsorbent polymer, a deodorant, antibacterial agent, etc. may be formulated as necessary.

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

In addition, the absorbent article of the present invention may be other absorbent articles such as sanitary pads (vaginal secretion pads), incontinence pads, disposable diapers, etc., in addition to menstrual sanitary pads. The omitted parts of the description in the above one embodiment and the necessary conditions of only one embodiment can be appropriately applied to other embodiments, respectively, and the necessary conditions in each embodiment can be appropriately replaced with each other in the embodiments.

Regarding the above embodiment, the present invention further discloses the following absorbent articles.

<1> An absorbent article comprising an absorbent article between the skin-side sheet forming the skin-facing side and the non-skin side sheet forming the non-skin-facing side, the absorbent body The longitudinally long absorbent core in the direction of the front and back of the sexual article, the absorbent core has a side area at the opposite side of the excretory portion: lateral areas on both sides in the width direction; and a central area on the side The square region is closer to the center in the width direction and the thickness is greater than the side region; the side region is integrally formed with the center region, the center region protrudes toward the non-skin side sheet side, and the absorber, when viewed from above The area where the side area is located has a non-joint area that is not joined to the non-skin side sheet.

<2> The absorbent article according to the above <1>, wherein a portion of the side region adjacent to the central region has a high-density portion having a density higher than that of the central region.

<3> The absorbent article according to the above <1> or <2>, wherein the non-skin-facing side of the central region is formed along the longitudinal direction of the absorbent core and on the skin With respect to the vertical groove having a bottom on the facing side, the length of the bottom in the width direction is narrower than the opening in the vertical groove.

<4> The absorbent article according to the above <3>, wherein the length of the longitudinal groove in the width direction gradually narrows from the opening toward the bottom.

<5> The absorbent article according to any one of <1> to <4>, wherein a central lateral groove extending in the width direction of the absorbent core is formed in the central region.

<6> The absorbent article according to any one of <1> to <5>, wherein a lateral longitudinal groove extending in the longitudinal direction of the absorbent core is formed in the lateral region.

<7> The absorbent article according to the above <6>, wherein lateral lateral grooves extending in the width direction of the absorbent core are formed in the lateral region.

<8> The absorbent article according to any one of the above <3> to <7>, wherein any one or both of the longitudinal groove and the lateral groove are obtained by reducing the absorbent material of the absorbent core The basis weight is formed.

<9> The absorbent article according to any one of the above <3> to <8>, wherein each of the center region and the side regions of the absorbent core has a non-skin facing surface having a concave-convex shape On the other hand, the opposite side of the skin is flat.

<10> The absorbent article according to any one of the above <3> to <9>, wherein the central area of the absorbent core is provided with a lower basis weight than the low basis weight portion forming the bottom of the longitudinal groove High base weight.

<11> The absorbent article according to the above <10>, wherein the density of the absorbent member in the high basis weight portion in the central region is higher than the low basis weight portion.

<12> The absorbent article according to any one of the above <6> to <11>, wherein in the lateral region of the absorbent core, a base having a lower basis weight than the bottom of the longitudinal groove is formed High basis weight with higher weight.

<13> The absorbent article according to the above <12>, wherein the high basis weight portion in the side area has a higher density of the absorbent member than the low basis weight portion.

<14> The absorbent article according to any one of the above <1> to <13>, wherein the ratio of the width of the central protrusion to the entire width of the absorbent core is 20% or more and 80% or less.

<15> The absorbent article according to any one of the above <1> to <14>, 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.

<16> The absorbent article according to any one of the above <10> to <15>, 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 weight ratio is above 5% and below 80%.

<17> The absorbent article according to any one of the above <7> to <16>, wherein at the boundary between the central area and the lateral area, the lateral groove of the central area and the lateral groove of the lateral area The longitudinal positions of the absorbent cores are the same.

<18> The absorbent article according to any one of the above <3> to <17>, wherein the bottom of the longitudinal groove in the central region is located below the lower surface of the lateral region.

<19> The absorbent article according to any one of the above <3> to <17>, wherein the bottom of the longitudinal groove in the central region exists at substantially the same position as the lower surface of the lateral region.

<20> The absorbent article according to any one of the above <3> to <17>, wherein the bottom of the longitudinal groove in the central region is located above the lower surface of the lateral region.

<21> The absorbent article according to any one of the above <5> to <20>, wherein the ratio of the depth of the lateral groove in the central region to the entire thickness of the absorbent core in the central region is 50% Above and below 95%.

<22> The absorbent article according to any one of the above <1> to <21>, wherein the height of the central protruding portion protruding from the lower surface of the lateral area at the opposite portion of the excretory portion is relative to the entire thickness of the central area The ratio is 20% or more and 90% or less.

<23> The absorbent article of the above <22>, wherein the central protrusion is behind The ratio of the height of the square portion protruding from the surface below the side area to the entire thickness of the center area is 20% or more and 90% or less.

<24> The absorbent article according to any one of the above <1> to <23>, wherein the absorbent article has a front part, an excretory part facing part and a rear part in the longitudinal direction, and the excretory part facing part The above-mentioned skin-side sheet, non-skin-side sheet, and absorbent core in the plan view, that is, an area where the absorbent body overlaps, that is, the left and right sides of the absorbent body are provided with a pair of side wings.

<25> The absorbent article according to any one of the above <1> to <24>, wherein the left and right sides of the absorbent body in the rear part have a pair of rear wings.

<26> The absorbent article according to any one of the above <1> to <25>, wherein the absorbent article is menstrual sanitary napkin.

[Industry availability]

The absorbent article of the present invention has an excellent fit feeling when worn, especially when a high pressure is applied.

1‧‧‧ Sanitary napkin

2a‧‧‧Front sheet

2b‧‧‧Side sheet

3‧‧‧Non-skin side sheet

4‧‧‧Absorber

5‧‧‧Central protrusion

12‧‧‧The protruding part is adjacent to the high-density part

41‧‧‧ Central area

41'‧‧‧Central thick wall area

42‧‧‧High basis weight

42d‧‧‧Forming the central protrusion of the central area

42u‧‧‧The part closer to the skin than the part that forms the central protrusion of the central region

43‧‧‧ Low Basis Weight

44a‧‧‧Slot

44b‧‧‧Slot

44d‧‧‧Bottom

45‧‧‧Side area

45'‧‧‧side area of absorber

46‧‧‧High basis weight

47‧‧‧ Low Basis Weight

48‧‧‧Low basis weight

50‧‧‧longitudinal groove

50a‧‧‧Opening

50b‧‧‧Bottom

52‧‧‧Side longitudinal groove

52a‧‧‧Opening

52b‧‧‧Bottom

La‧‧‧ opening length in the width direction

Lb‧‧‧The length of the bottom in the width direction

S2‧‧‧Surface under side area

t‧‧‧Projection height of central projection

t1‧‧‧ Thickness of the central area

t2‧‧‧ Thickness of lateral area

W1‧‧‧The width of the central protrusion

W2‧‧‧The entire width of the absorbent core

Y‧‧‧Width direction

Claims (18)

An absorbent article comprising an absorbent article having an absorber between a skin-side sheet forming a skin-facing side and a non-skin side sheet forming a non-skin-facing surface, the absorbent body including A longitudinally elongated absorbent core in the front-rear direction, the absorbent article has a front portion, an excretory portion opposing portion, and a rear portion in the longitudinal direction thereof, and the absorbent core has an excretory portion opposing portion: side The square area is located on both sides in the width direction; and the center area is located on the center side in the width direction from the side area and has a thickness greater than the side area; the side area is integrally formed with the center area, and the center area It protrudes toward the non-skin side sheet side, and in the absorber, the area where the side area is located in a plan view has a non-joint area that is not joined to the non-skin side sheet, and in the side area The portion adjacent to the central area has a high-density portion higher in density than the central area, and is formed on the non-skin-facing side of the central area along the length of the absorbent core and on the skin-facing side In the longitudinal groove of the bottom, the bottom of the longitudinal groove in the central region is located below the lower surface of the lateral region. The absorbent article according to claim 1, wherein the longitudinal groove has a narrower length in the width direction of the bottom than the opening. The absorbent article according to claim 2, wherein the length of the longitudinal groove in the width direction gradually narrows from the opening toward the bottom. The absorbent article according to claim 1, wherein the absorbent article is formed in the central area A central transverse groove extending in the width direction of the retractable core. The absorbent article according to claim 1, wherein a lateral longitudinal groove extending in the longitudinal direction of the absorbent core is formed in the lateral region. The absorbent article according to claim 5, wherein a lateral lateral groove extending in the width direction of the absorbent core is formed in the lateral region. The absorbent article according to claim 2, wherein each of the central region and the side regions of the absorbent core has a non-skin-facing surface having an uneven shape, and on the other hand, the skin-facing surface is flat. The absorbent article according to claim 2, wherein the central area of the absorbent core includes a high basis weight portion having a higher basis weight than a low basis weight portion forming the bottom of the longitudinal groove. The absorbent article according to claim 8, wherein the density of the high basis weight portion in the central region is higher than that of the low basis weight portion. The absorbent article according to claim 5, wherein the side region of the absorbent core includes a high basis weight portion having a higher basis weight than a low basis weight portion forming the bottom of the side longitudinal groove. The absorbent article according to claim 10, wherein the density of the high basis weight portion in the lateral area is higher than that of the low basis weight portion. The absorbent article according to claim 1, 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 claim 8, wherein the ratio of the basis weight of the low basis weight portion to the basis weight of the high basis weight portion in the central region of the absorbent core is 5% or more and 80% or less. The absorbent article according to claim 6, wherein a central transverse groove extending in the width direction of the absorbent core is formed in the central region, and at the boundary between the central region and the lateral region, the central region of the central region is horizontal The side of the slot and the side area The positions of the above-mentioned absorbent cores of the square transverse grooves are the same in the longitudinal direction. The absorbent article according to claim 2, wherein the bottom of the longitudinal groove in the above-mentioned central region is present at substantially the same position as the lower surface of the above-mentioned lateral region. The absorbent article according to claim 4, wherein the ratio of the depth of the central transverse groove in the central region to the entire thickness of the absorbent core in the central region is 50% or more and 95% or less. The absorbent article according to claim 1, wherein the area where the skin-side sheet, the non-skin-side sheet and the absorbent core in the excretory facing portion overlap in a plan view is called an absorbent body. The right and left sides of the sexual body are provided with a pair of side wings. The absorbent article according to claim 1, wherein the above-mentioned absorbent article is menstrual sanitary napkin.

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