JP6563672B2 - Absorbent articles - Google Patents

Description

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

Conventionally, in an absorbent article such as a sanitary napkin, by providing a three-dimensional guard standing on the skin side of the wearer on both sides of the excretion part facing part arranged to face the wearer's liquid excretion part, Preventing leakage of liquid to the side is widely performed (see Patent Documents 1 to 3).
Moreover, in an absorbent article having a long longitudinal length along the wearer's front-rear direction, such as a sanitary napkin suitable for use at bedtime, there is a gap between the skin of the wearer In the sleeping posture, the liquid may flow along the surface of the skin to the buttocks, leading to liquid leakage.
Therefore, a technique is known in which a thick part of the absorbent core of the absorbent article is partially formed and a raised portion is formed on the skin contact surface, thereby improving the fit to the body ( (See Patent Document 4).

JP 2002-360629 A Japanese Patent Laid-Open No. 2003-210525 Japanese Patent Laid-Open No. 2007-143697 JP 2006-239162 A

However, the present inventors have formed a raised portion by partially increasing the basis weight of the absorbent body in the absorbent core in the absorbent article in which the three-dimensional guard is formed, in particular, in order to improve the absorption performance, If the absorbent core is provided with a middle and high region of the excretory part that is long and wide in the longitudinal direction of the absorbent core, the rigidity of the absorbent core is increased, and it is applied to the body while wearing or wearing the absorbent article. It was found that the three-dimensional guard easily falls to the center side in the width direction of the absorbent article when the following performance of the absorbent article is impaired, the twist occurs, or the twist occurs in the absorbent article. If the three-dimensional guard falls to the center in the width direction, the three-dimensional guard leakage prevention function may not be sufficiently developed.
Therefore, the subject of this invention is providing the absorbent article which can eliminate the fault which the prior art mentioned above has.

  The present invention relates to a skin-side sheet disposed on the skin contact surface side, a non-skin-side sheet disposed on the non-skin contact surface side, and a shape that is located between these two sheets and that is long in the front-rear direction of the absorbent article The absorbent article has an excretory part facing part disposed opposite to the liquid excretion part of the wearer and a rear part arranged behind the excretion part facing part, wherein the absorbent core is The excretory part-facing part has an excretion part middle-high area having a thickness greater than the surrounding part, and the excretion part middle-high area has a shape that is long in the longitudinal direction of the absorbent core, and its maximum width is The absorbent article has a width of ½ or more of the absorbent core, and the absorbent article includes a pair of three-dimensional guards on both sides of the excretory part middle and high regions in the excretion part-facing part. A fixed end where the guard forming sheet is fixed to the skin side sheet, and a free end The free end side of the fixed end rises toward the wearer's skin side, and the side edge of the excretion part middle-high region in the width direction of the absorbent core and the fixed end There is provided an absorbent article in which a side low-rigidity region extending in the longitudinal direction of the absorbent core and having a lower bending rigidity in the width direction than other regions is formed.

  According to the absorbent article of the present invention, it is long in the longitudinal direction and has a wide excretion part middle and high region, sufficient absorption performance is expressed, the absorbent article is difficult to twist, and the three-dimensional guard is the width of the absorbent article. It is difficult to fall to the center in the direction and has excellent side leakage prevention.

FIG. 1 is a perspective view showing a sanitary napkin according to a first embodiment of the present invention. FIG. 2 is a perspective view showing an absorbent core of the sanitary napkin of FIG. 3 is a cross-sectional view taken along line III-III in FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. FIG. 5 is a plan view of the absorbent core of the sanitary napkin of FIG. 1 viewed from the skin contact surface side. FIG. 6 is an enlarged plan view showing a part of the absorbent core shown in FIG. 5 in an enlarged manner. FIG. 7 is a schematic cross-sectional view showing a deformed state of the sanitary napkin shown in FIG. 1 when worn. 8 (a) and 8 (b) are schematic views showing a cross-section along the circumferential direction of the pile drum preferably used for manufacturing the absorbent core of the sanitary napkin shown in FIG. FIG. 8A is a diagram showing a state before the absorbent core forming material is deposited in the accumulation recess, and FIG. 8B is a diagram showing a state in which the absorbent core forming material is deposited in the accumulation recess. FIG. 9 is a view corresponding to FIG. 6 of the absorbent core of the sanitary napkin of the second embodiment. Fig.10 (a)-FIG.10 (f) are top views which show the absorptive core in other embodiment of this invention.

The present invention will be described below based on preferred embodiments with reference to the drawings.
A sanitary napkin 1 (hereinafter also simply referred to as a napkin 1) according to a first embodiment of the present invention includes an absorbent main body 6 that is long in the front-rear direction X of the napkin 1 and a pair of wings as shown in FIG. It has the parts 7 and 7 and a pair of back flap parts 8 and 8. With respect to absorbent articles such as sanitary napkins, the “front-rear direction” is a direction that coincides with the wearer's front-rear direction when worn.
The napkin 1 has the front part A, the excretory part opposing part B, and the rear part C in the front-back direction X, and a pair of wing parts 7 and 7 on the left and right sides of the absorbent main body 6 in the excretory part opposing part B. The napkin has a pair of rear flap portions 8 and 8 on the left and right sides of the absorbent main body 6 in the rear portion C, and is preferably used for so-called night use. The night napkin is assumed to be used at bedtime, and the total length is preferably 30 cm or more.

  In the absorbent article of the present invention, the excretory part facing part B is a part in which a wearer's liquid excretion part (such as a vaginal opening) is opposed to the central part in the width direction, and the front part A is opposed to the excretion part. It is a part arranged on the wearer's front side (abdominal side) from the part B, and the rear part C is a part arranged on the wearer's back side from the excretion part facing part B. When the excretory part facing part B has a wing part like the napkin 1 of the present embodiment, the wing part is arranged in the front-rear direction of the absorbent article (the same as the longitudinal direction of the absorbent main body, the X direction in the figure). It is the area | region (area | region pinched | interposed into the base of the one side of the front-back direction of a wing part, and the base of the other side). The excretion part opposing part B in the absorbent article which does not have a wing part is produced when the absorbent article is folded into a three-fold individual packaging form. Two folding curves (not shown) crossing in the Y direction in the middle are areas surrounded by a first folding curve and a second folding curve, counted from the front end in the longitudinal direction of the absorbent article. Moreover, in this specification, a skin contact surface is a surface turned to a wearer's skin side at the time of wear in an absorbent article or its structural member, and a non-skin contact surface is in an absorbent article or its structural member. It is a surface that is directed to the opposite side (clothing side) of the wearer's skin when worn.

As shown in FIG. 3 or 4, the napkin 1 includes a skin side sheet 2 disposed on the skin contact surface side, a non-skin side sheet 3 disposed on the non-skin contact surface side, and both of these sheets 2, An absorbent core 4 disposed between the three is provided. The skin-side sheet 2 disposed on the skin contact surface side is arranged at the center in the width direction of the absorbent main body 6 so as to cover the entire length of the absorbent main body 6. In addition, the napkin 1 includes a pair of three-dimensional guards 10 in the excretory part facing part B. The three-dimensional guard 10 has a three-dimensional guard forming sheet 20 and an elastic member 24 fixed thereto. As the elastic member 24, a thread-like elastic member or the like is used.

  The three-dimensional guard forming sheet 20 has a folded portion 21 that is located on the center side in the width direction of the absorbent main body 6 and is folded outward, and is located outward in the width direction Y from the folded portion 21. The part is joined on the skin-side sheet 2 by joining means such as an adhesive 9. Thereby, the fixed end 22 of the three-dimensional guard 10 which becomes the rising base end of the three-dimensional guard 10 is formed. The fixed end 22 of the three-dimensional guard 10 extends in the longitudinal direction of the absorbent main body 6 over a range from a part of the front part A through the excretory part facing part B to a part of the rear part C. A one-dot chain line 22 in FIG. 6 indicates the position of the fixed end 22 of the three-dimensional guard 10.

The three-dimensional guard 10 is configured such that the free end 23 side of the fixed end 22 stands on the skin side of the wearer when worn. More specifically, the three-dimensional guard forming sheet 20 has an elastic member 24 for forming a three-dimensional guard in the vicinity of the inner edge that forms the free end 23 of the three-dimensional guard 10. Due to the contraction force, the space between the fixed end 22 and the free end 23 in the excretory part facing part B rises toward the wearer's skin side to form the three-dimensional guard 10. The three-dimensional guard 10 can stand at least in the region where the excretion portion middle-high region 40 described later is present. Moreover, in the napkin 1 of this embodiment, in the part of the front part A and most of the rear part C , the solid guard forming sheet 20 is fixed to the skin side sheet 2 side and becomes a non-standing part that does not stand up. Yes.

  The pair of wing portions 7, 7 and the pair of rear flap portions 8, 8 are composed of a three-dimensional guard forming sheet 20 and a non-skin side sheet 3 extending from both side edges of the absorbent core 4. A wing portion adhesive portion 71 for fixing to the non-skin contact surface of the crotch portion of the shorts is provided on the surface formed of the non-skin side sheet 3 of each of the pair of wing portions 7. A main body adhesive portion (not shown) for fixing the main body 6 to the inner surface of the shorts is provided on the contact surface. The rear flap 8 is arranged on the inner surface of the shorts (surface directed to the skin side) when worn. It is preferable that an adhesive portion for fixing to the inner surface of the shorts is also provided on the surface of the rear flap portion 8 made of the non-skin side sheet 3. The skin-side sheet 2 and the non-skin-side sheet 3 are joined to each other with an adhesive from the periphery of the absorbent core 4 and are joined to each other at the periphery of the napkin 1 by heat sealing.

  The absorbent core 4 in the napkin 1 is composed of a fiber assembly made of a fiber material such as pulp fiber or a fiber assembly in which a superabsorbent polymer is held. The upper and lower surfaces of the absorbent core 4 are covered with a core wrap sheet (not shown) made of tissue paper or a water-permeable nonwoven fabric. The core wrap sheet is used for the purpose of preventing leakage of the forming material of the absorbent core or improving the shape retention of the absorbent core. Between the skin side sheet 2 and the core wrap sheet covering the skin contact surface side of the absorbent core 4, and the core wrap sheet covering the non skin contact surface side of the non-skin side sheet 3 and the absorbent core 4. Are preferably joined to each other by a pattern-coated adhesive such as dots, spirals, and stripes.

As shown in FIG. 2, the absorbent core 4 in the napkin 1 has a shape that is long in the same direction as the front-rear direction X of the napkin 1. Therefore, the longitudinal direction of the absorbent core 4 is the same direction as the front-rear direction X of the napkin 1, and the lateral direction of the absorbent core 4 is the same direction as the width direction Y of the napkin 1. As shown in FIG. 5, the absorbent core 4 has a pair of side edges 4 s and 4 s extending in the longitudinal direction X, and an arcuate front edge 4 a and rear edge 4 c.
Moreover, as shown in FIG. 2, the absorptive core 4 has the excretion part middle-high area | region 40 in the center part of the width direction Y in the excretion part opposing part B, and the back middle high in the center part of the width direction Y in the back part C. A region 50 is included. The excretion part middle-high region 40 is thicker than the portion 43 surrounding the periphery thereof, and the rear middle-high region 50 is also thicker than the portion 43 including the periphery thereof.

  And in the napkin 1, it wears in the width direction center part of the skin contact surface in the excretion part opposing part B by the central thick part 41 of the excretion part middle-high area | region 40 existing under the skin side sheet | seat 2. The front raised portion 11 protruding toward the skin side of the person is formed, and the presence of the rear middle / high region 50 under the skin side sheet 2 makes the width direction of the skin contact surface in the rear portion C A rear raised portion 12 that protrudes toward the wearer's skin is formed at the center. It is preferable that the rear bulge portion 12 is disposed to face the wearer's crack when the napkin 1 is worn.

Moreover, the excretion part middle-high area 40 in the napkin 1 has a vertically long plan view shape that is long in the longitudinal direction X of the absorbent core, as shown in FIGS. 2 and 5. Moreover, the excretion part middle-high area | region 40 in the napkin 1 has the maximum width W40 of 1/2 or more of the width W4 of the absorptive core 4, More preferably, it is 5/8 or more, More preferably, it is 3/4 or more. Moreover, it is preferable that the maximum width W40 of the excretion part middle-high area | region 40 is 7/8 or less of the width W4 of the absorptive core 4 (refer FIG. 6).
The maximum width W40 of the excretion part middle-high region 40 is the width of the excretion part middle-high region 40 at a portion where the width, which is the length along the width direction Y of the absorbent core 4, becomes maximum. The width of the absorbent core 4 compared with the maximum width W40 of the excretion part middle-high region 40 is the width of the absorbent core 4 at a site where the width of the excretion part middle-high region 40 becomes the maximum width W40. As shown in FIG. 5, the excretion part middle-high region 40 preferably has a part G having a maximum width in the excretion part facing part B.

  When the excretion part middle-high area 40 is long in the longitudinal direction of the absorbent core 4 and is wide, the liquid absorption capacity and the liquid absorption speed in the excretion part facing part B are increased, thereby preventing liquid leakage. From the same viewpoint, the excretion part middle-high area 40 includes a central thick part 41 having a plan view shape that is long in the longitudinal direction of the absorbent core, and both side edges of the central thick part 41 in the region near the front part A and It is further preferable to have side thick portions 42 and 42 that extend outward in the width direction Y rather than the respective side edges in the region near the rear portion C. By having the side thick part 42 at the position of the central thick part 41, the absorption power and absorption speed of the excretion part are further increased, and the liquid leakage preventing effect is further improved.

  Moreover, between the central thick part 41 and the side thick parts 42 and 42 in the absorptive core 4, any basic weight (core material of the core thick part 41 and the side thick parts 42 and 42) is provided. A low basis weight portion having a lower basis weight than the basis weight) is provided, and a longitudinal groove portion 49 is formed in the low density portion. Due to the presence of the longitudinal groove portion 49, the excretion portion middle-high region 40 is improved in the liquid absorbability, and the follow-up performance of the napkin 1 to the body is further increased, so that the liquid leakage is less likely to occur. As shown in FIG. 1, the central thick portion 41 has linear side end edges 41 s and 41 s extending in the longitudinal direction X of the absorbent core 4, and the front end edge 41 a of the central thick portion 41. And the rear-end edge 41c becomes a shape where the length of the width direction Y reduces gradually toward the front and back. More specifically, the central thick portion 41 has an arcuate front end edge 41a and a rear end edge 41c, and has an oval plan view shape having a long axis in the longitudinal direction X as a whole. Yes.

  Although the excretion part middle-high area 40 and the central thick part 41 may be formed only in the excretion part opposing part B of the napkin 1, the excretion part opposing part B like the napkin 1 of this embodiment shown in FIG. It is more preferable that it extends over a part of the rear part C from the point of improving the amount of absorption and preventing the rear leakage. Moreover, the excretion part middle-high region 40 and the central thick part 41 may extend from the excretion part facing part B to a part of the rear part C and to a part of the front part A.

The central thick portion 41 in the present embodiment is divided by a central lateral groove portion 44 extending in the width direction of the absorbent core 4 and a central vertical groove portion 46 extending in the longitudinal direction of the absorbent core 4, thereby the central thickness portion. A plurality of small absorbing portions 45 are formed in the portion 41.
In the central thick part 41 in the present embodiment, five small absorbent parts 45 are arranged along the longitudinal direction X of the absorbent core 4, and the small absorbent parts 45 are arranged along the width direction Y of the absorbent core 4. Two pieces are arranged side by side, and a total of ten small absorbing portions 45 are formed.
In the absorptive core 4 of this embodiment, parts other than the excretion part middle high region 40 and the back middle high region 50 are the standard absorption region 43 with uniform thickness. The standard absorption area 43 in this embodiment is the front part from the excretion part middle-high area 40, the side part sandwiching the excretion part middle-high area 40, the intermediate area 60 between the excretion part middle-high area 40 and the rear middle-high area 50, and the rear middle-high area. 50 is distributed behind the side portion of the absorbent core sandwiching 50 and the rear middle-high region 50.

The thickness of the excretion part middle-high region 40 is the thickness of the part other than the groove part (the central lateral groove part 44, the central longitudinal groove part 46, the central lateral groove part 47, the longitudinal groove part 49). For example, the thickness of the central thick part 41 is small. It is the same as the thickness of the absorption part 45. As shown in FIG. 2, the absorbent core 4 in the present embodiment also has a transverse groove portion 43 a extending in the width direction Y of the absorbent core 4 and a longitudinal groove portion extending in the longitudinal direction X of the absorbent core 4 in the standard absorbent region 43. 43b is formed, but the thickness of the standard absorption region 43 as compared with the thickness of the excretion portion middle-high region 40 and the rear middle-high region 50 is such that the groove portions such as the lateral groove portion 43a, the vertical groove portion 43b, and the side vertical groove portion 5 described later. It is the thickness in the nonexistent part.
Moreover, when the leak-proof groove | channel from the skin side sheet | seat 2 to the absorptive core 4 is provided like the pressing groove 13 mentioned later, the standard absorption area | region 43, middle-high area (excretion part middle-high area 40, back middle-high area 50 ) When measuring the thickness of each part of the absorbent core such as the intermediate region 60, the thickness is measured so as not to include such a leak-proof groove portion.

The thickness of the central thick portion 41 is such that the front raised portion 11 that protrudes toward the skin is formed on the skin contact surface of the napkin 1, and the adhesion to the excretion portion in the excretion portion facing portion B and the amount of liquid retained From the viewpoint of improving the absorptivity, etc., the thickness of the standard absorption region 43 is preferably 150% (1.5 times) or more, more preferably 200% or more, and preferably 500% or less, more preferably Is 300% or less, and from the viewpoint of suppressing the uncomfortable feeling during wearing, it is preferably 150% or more and 500% or less, more preferably 200% or more and 300% or less of the thickness of the standard absorption region 43.
The difference in thickness between the central thick portion 41 and the standard absorption region 43 (the former-the latter) is preferably 2 mm or more, more preferably 3.5 mm or more, and preferably 8 mm or less, more preferably Is 6 mm or less, preferably 3 mm or more and 8 mm or less, more preferably 3.5 mm or more and 6 mm or less. The preferable thickness ratio and the difference in thickness are the same for the thickness of the rear middle-high region 50 and the thickness of the standard absorption region 43.
In addition, it is preferable that the relationship of the thickness is in the entire range of the central thick portion 41, but in the case where the thickness of the central thick portion 41 is inclined, the above-mentioned thickness is increased in the thickest portion. It only has to be a relationship.

The thickness of each part of the absorbent core is measured by the following method. In addition, when the absorptive core is coat | covered with the core wrap sheet | seat like the napkin 1 of this embodiment, the thickness of each part of an absorptive core is the state in which this absorptive core is wrapped in the core wrap sheet | seat. taking measurement.
<Measurement method of thickness of each part of absorbent core>
The absorptive core, which is the object to be measured, is placed in a horizontal place so as not to be wrinkled or bent, and the thickness under a load of 5 cN / cm ² is measured. A thickness meter PEACOCK DIAL UPRIGHT GAUGES R5-C (manufactured by OZAKI MFG.CO.LTD.) Was used for measuring the thickness in the present invention. At this time, a circular plate or a square plate (acrylic plate having a thickness of about 5 mm) in plan view is disposed between the tip of the thickness meter and the measurement portion of the measurement object, and the load is 5 cN / cm ² . Adjust the size of the plate so that

  The side thick portions 42 and 42 are thicker than the thickness in the standard absorption region 43, similarly to the central thick portion 41. In the present embodiment, as shown in FIG. 2, a central lateral groove portion 47 extending in the width direction of the absorbent core 4 is formed in each of the lateral thick portions 42, 42, thereby laterally A plurality of small absorbing portions 48 are formed in each of the thick portions 42 and 42.

  The thickness of the side thick portion 42 is preferably 120% or more, more preferably 150% or more, and preferably 200% or less, more preferably 180% or less, of the thickness of the standard absorption region 43. , Preferably 120% to 200%, more preferably 150% to 180%. Further, the difference between the thickness of the side wall portion 42 and the standard absorption region 43 (the former-the latter) is preferably 2.4 mm or more, more preferably 4 mm or more, and preferably 7.2 mm or less. More preferably, it is 6.4 mm or less, Preferably it is 2.4 mm or more and 7.2 mm or less, More preferably, it is 4 mm or more and 6.4 mm or less. The thickness of the side thick part 42 when the side thick part 42 has the lateral groove 47 described above or the compressed groove 13 (pressed vertical groove 14 or the like) to be described later is that of the portion other than the groove and compressed groove. The thickness of the standard absorption region 43, which means the thickness and is compared with the thickness of the side thick portion 42, is a thickness in a portion where there is no groove such as the lateral groove 43a, the vertical groove 43b, and the side vertical groove 5 described later. .

  Similarly to the central thick portion 41, the rear middle / high region 50 is thicker than the thickness in the standard absorption region 43. In the present embodiment, as shown in FIG. 2, a rear lateral groove portion 51 extending in the width direction of the absorbent core 4 is also formed in the rear middle / high region 50, whereby a plurality of rear middle / high regions 50 are formed in the rear middle / high region 50. Small absorption parts 52, 52 are formed.

  The thickness of the rear middle-high region 50 is absorbable from the viewpoint of forming a rear raised portion that protrudes toward the skin on the skin contact surface of the napkin 1 to improve fit to the body (preferably a tear). The thickness of the standard absorption region 43 of the core 4 is preferably 130% or more, more preferably 180% or more, preferably 300% or less, more preferably 230% or less, and preferably 130% or more. It is 300% or less, more preferably 180% or more and 230% or less. Further, the difference between the thickness of the rear middle-high region 50 and the thickness of the standard absorption region 43 (the former-the latter) is preferably 0.9 mm or more, more preferably 2.7 mm or more, and preferably 4.7 mm or less, More preferably, it is 4.0 mm or less, Preferably it is 0.9 mm or more and 4.7 mm or less, More preferably, it is 2.7 mm or more and 4.0 mm or less.

  The thickness of the rear middle / high region 50 in the case where the rear middle / high region 50 includes the above-described rear lateral groove portion 51, the compressed groove 13 described later, and the like means the thickness of portions other than the groove portion and the compressed groove, and the rear middle / high region 50 The thickness of the standard absorption region 43 as compared with the thickness of is a thickness in a portion where there is no groove such as the lateral groove 43a, the vertical groove 43b, and the side vertical groove 5 described later.

  The excretion part middle-high area 40 and the rear middle-high area 50 in the present embodiment are formed by increasing the basis weight of the absorbent core forming material (hereinafter also referred to as “core material”) more than the standard absorbent area 43. . That is, the portions other than the groove portions (the central horizontal groove portion 44, the central vertical groove portion 46, the central horizontal groove portion 47, the vertical groove portion 49) in the excretion portion middle high region 40 and the portions other than the groove portion (rear horizontal groove portion 51) of the rear middle high region 50 are The basis weight of the core material is larger than the basis weight in the standard absorption region 43. The absorptive core 4 in this embodiment provides a difference in thickness by providing a difference in basis weight of the core material between the middle-high area (the excretion part middle-high area 40 and the rear middle-high area 50) and the portion surrounding each. Therefore, the absorbent core 4 is flexible as a whole, unlike the case where a thickness difference is provided by compressing a part of the absorbent core having a uniform basis weight.

Moreover, the part which forms the groove part (the central horizontal groove part 44, the central vertical groove part 46, the central horizontal groove part 47, and the vertical groove part 49) in the excretion part middle-high area 40 is a high basic weight part in the excretion part middle-high area 40. Compared with the part (small absorption part 45 and small absorption part 48), the basic weight of the core material is a low low basic weight part. The central longitudinal groove part 46 is a central low basis weight part formed in the excretion part middle-high area 40.
Similarly, the part which forms the groove part (rear horizontal groove part 51) in the rear middle / high area 50 is a core material compared with the other part (small absorption part 52) which is a high basic weight part in the rear middle / high area 50. The basis weight is a low basis weight part with a relatively low basis weight.

  In the napkin 1, as shown in FIG. 2, the thickness is excreted across the entire region in the width direction Y of the absorbent core 4 between the excretory middle-high region 40 and the rear middle-high region 50 of the absorbent core 4. An intermediate region 60 that is thinner than the thicknesses of the middle and high regions 40 and 50 is formed.

As shown in FIGS. 4 and 6, the absorbent core 4 in the present embodiment is more specific between the side edge of the excretion part middle-high region 40 and the fixed end 22 of the three-dimensional guard 10 in the width direction Y. Specifically, the lateral low-rigidity region E extending in the longitudinal direction X of the absorbent core 4 between the side edge 42s of the side thick portion 42 of the excretion portion middle-high region 40 and the fixed end 22 of the three-dimensional guard 10. Is formed. The lateral low rigidity region E is a region having a lower bending stiffness in the lateral direction than the other regions. The “other regions” here are other regions in the absorbent core 4 other than the middle and high regions (the excretion portion middle and high regions 40 and the rear middle and high regions 50), and the “lateral bending rigidity” is This is resistance to bending when bending is performed to generate a folding line or a folding portion extending along the longitudinal direction X of the absorbent core 4.
The lateral low-rigidity region E in the present embodiment is formed by providing the lateral longitudinal groove portion 5 having a concave groove on the outer side of the side edge of the excretion portion middle-high region 40 in the absorbent core 4. The bending rigidity in the width direction is lower than that of the other regions at a portion outside the side edge of the excretion portion middle-high region 40.

The concave groove in the lateral longitudinal groove 5 may be formed on the non-skin contact surface side of the absorbent core, but in the napkin 1 of the present embodiment, it is formed on the skin contact surface side of the absorbent core. ing.
More preferably, the lateral low rigidity region E is formed so as to extend over the entire length L2 of the lateral thick portion 42. In order to cover the entire length of the side thick part, the side low rigidity region E such as the side longitudinal groove part 5 exists in the range P where the side thick part 42 in the longitudinal direction of the absorbent core 4 exists. The front end 5a of the side low rigidity region E such as the side vertical groove portion 5 is located at the same position as or in front of the front end 42a of the side thick portion 42, and the side of the side vertical groove portion 5 etc. This means that the rear end 5b of the lower rigidity region E is located at the same position as the rear end 42c of the side thick portion 42 or behind the position.

  The napkin 1 and the absorbent core 4 according to the present embodiment are formed symmetrically with respect to a longitudinal center line (not shown) that bisects the absorbent core 4 in the width direction Y. The rigid region E is formed on each side of the longitudinal center line. The lateral low-rigidity region E exists between the position of the side edge 42s of the side thick portion 42 and the position of the fixed end 22 of the three-dimensional guard 10 in the width direction Y of the absorbent core 4. When the lateral low-rigidity region E is formed by the lateral longitudinal groove portion 5, the lateral longitudinal groove portion 5 is side edge 42 s of the lateral thick portion 42 in the width direction Y of the absorbent core 4. And the position of the fixed end 22 of the three-dimensional guard 10 are separated from each other.

  Moreover, the absorptive core 4 has the outline groove part 53 formed in the outer side of this outline along the outline of the side thick part 42, as shown in FIG. There is an inclined groove portion 53b extending obliquely from the front and rear ends of the vertical groove portion toward the central thick portion. The lateral longitudinal groove 5 is formed separately from the longitudinal groove 53a portion of the contour groove 53.

  The side vertical groove portions 5 are formed by reducing the core material from other portions of the standard absorption region 43, similarly to the other horizontal groove portions 43 a and the vertical groove portions 43 b formed in the standard absorption region 43. The same applies to the contour groove 53 and the horizontal groove 61 and the vertical groove 64 formed in the intermediate region 60. That is, the portion in which the groove portion (the lateral longitudinal groove portion 5, the contour groove portion 53, the lateral groove portion 61, the longitudinal groove portion 64, etc.) in the standard absorbent region 43 of the absorbent core 4 is formed in other portions in the standard absorbent region 43 ( The basis weight of the core material is a relatively low low basis weight portion compared to the high basis weight portion). In the napkin 1 of the present embodiment, the groove portions 43a, 43b, 44, 46, 47, 49, 51, 5, 53, 61, 64 are formed on the skin contact surface of the absorbent core 4. On the non-skin contact surface side of the absorbent core 4, a continuous layer 59 that is not divided by these grooves is formed.

According to the napkin 1 of this embodiment, since the absorptive core 4 has the excretion part middle-high area | region 40 which is long in the longitudinal direction of the absorptive core 4 and is wide in the excretion part opposing part B, the excretion part opposing part B The liquid absorbing power and liquid absorbing speed of the liquid are increased, and liquid leakage is prevented.
Furthermore, since the absorptive core 4 has the excretion part middle-high area 40 which consists of the central thick part 41 and the side thick parts 42 and 42 located in the both sides in the excretion part opposing part B, a central thick part The part having 41 fits the wearer's liquid excretion part, and excretion liquid such as menstrual blood excreted from the liquid excretion part is rapidly absorbed. Further, when the napkin 1 is fixed and attached to the crotch portion 91 of clothing such as shorts, the center line extending in the front-rear direction of the body of the napkin 1 coincides with the center line extending in the longitudinal direction of the central thick portion 41. Even if not, leakage from the width direction is easily suppressed due to the presence of the side thick portions 42 and 42, and the side thick portion 42 is firmly attached to the opposite site of the wearer's liquid excretion portion. As a result of the arrangement, sufficient absorption performance is exhibited, and inconveniences such as a decrease in absorption performance due to displacement of the arrangement position hardly occur.

In addition, the lateral longitudinal groove 5 that forms the lateral low rigidity region E is formed between the lateral edge 42 s of the lateral thick part 42 and the fixed end 22 of the three-dimensional guard 10. Therefore, when the napkin 1 is worn or worn, the absorbent core 4 is easily bent so that the side longitudinal groove 5 becomes the base point and warps to the non-skin contact surface side. Thereby, as shown in FIG. 7, the left and right three-dimensional guards 10 are easily opened in the left and right outer directions.
Therefore, it is possible to effectively prevent inconveniences such as the occurrence of side leakage due to the three-dimensional guard 10 falling to the inner side in the width direction of the absorbent core 4. Further, the absorbent core 4 is bent toward the non-skin contact surface side with the lateral longitudinal groove portion 5 as a base point, thereby improving the fit and followability of the napkin 1 to the inner surface of the thigh. Leakage from the gaps between them is less likely to occur.

  Moreover, in the napkin 1 of this embodiment, the central vertical groove parts 46 and 49 extended in the longitudinal direction X of the absorptive core 4 are formed in the excretion part middle-high area 40, and the central vertical groove parts 46 and 49 and the side vertical groove part are formed. The groove 5 is formed on the skin contact surface side surface of the absorbent core 4. For this reason, the absorbent core 4 has a low rigidity and is deformed flexibly by the lateral longitudinal groove portion 5, so that it is easier to fit the shape of the body, and the absorbent body including the absorbent core is difficult to twist.

From the viewpoint of ensuring that the above-described one or more effects are more reliably exhibited, the napkin 1 preferably has one or more of the following configurations.
The central thick portion 41 has an overall length Lx in the longitudinal direction of the absorbent core 4 that is preferably 1.5 or more, more preferably 2 or more, and preferably 15 or less of the length Ly in the width direction. Preferably it is 10 or less.
Further, in the side thick part 42, the total length L2 in the longitudinal direction X of the absorbent core 4 is preferably 10% or more, more preferably 20% of the full length Lx of the excretory part middle-high region 40 or the central thick part 41. In addition, it is preferably 80% or less, more preferably 60% or less, and preferably 10% or more and 80% or less, more preferably 20% or more and 60% or less. The side thick part 42 exists in the area | region of the excretion part opposing part B in the front-back direction (X direction in a figure) of an absorbent article. Front end 42a of the side thick portion 42, may be in the front portion A, it is preferably located in the excretion portion pair countercurrent section B. The rear end 42c of the side thick part 42 may be in the rear part C, but is preferably located in the excretory part facing part B.

Further, in the lateral longitudinal groove portion 5 and the lateral low rigidity region E, the total length L5 in the longitudinal direction X of the absorbent core 4 is preferably 10% or more of the total length L2 of the lateral thick portion 42 in the same direction X. More preferably, it is 20% or more, more preferably more than 100%. The upper limit of the total length L5 of the lateral low rigidity region E is the total length of the absorbent core 4.
Further, in the lateral longitudinal groove portion 5 and the lateral low rigidity region E, the total length L5 in the longitudinal direction X of the absorbent core 4 is preferably 5% or more of the total length Lx of the excretory portion middle-high region 40 or the central thick portion 41. More preferably, it is 10% or more, preferably 100% or less, more preferably 80% or less, preferably 5% or more and 100% or less, more preferably 10% or more and 80% or less.

Further, the lateral longitudinal groove 5 and the lateral low-rigidity region E preferably extend forward from the front end 42a of the lateral thick portion 42 in the longitudinal direction X of the absorbent core 4, and from the front end 42a. The extending length La is preferably 10% or more, more preferably 20% or more, of the total length L2 of the lateral thick part 42. Moreover, it is preferable that the upper limit of length La extended from the front end 42a is the length which reaches the front end 41a of the excretion part middle-high area | region 40 or the center thick part 41, or less.
Further, the lateral longitudinal groove 5 and the lateral low-rigidity region E preferably extend rearward from the rear end 42c of the side thick portion 42 in the longitudinal direction X of the absorbent core 4, and the rear end The length Lb extending from 42c is preferably 10% or more, more preferably 20% or more, of the total length L2 of the side thick portion 42. Moreover, it is preferable that the upper limit of the length Lb extended from the rear end 42c is the length which reaches the rear end 41b of the excretion part middle-high area 40 or the center thick part 41, or less.

  Further, in the lateral longitudinal groove portion 5 and the lateral low rigidity region E, the separation distance from the fixed end 22 of the three-dimensional guard 10 is preferably 1.0 mm or more, more preferably 2.0 mm or more, and preferably 5 It is 0.0 mm or less, More preferably, it is 4.0 mm or less, Preferably it is 1.0 or more and 5.0 mm or less, More preferably, it is 2.0 mm or more and 4.0 mm or less. Further, the lateral longitudinal groove portion 5 and the lateral low rigidity region E have a separation distance from the side edge 42s of the excretion portion middle height region 40 or the lateral thick portion 42, preferably 1.0 mm or more, and more preferably 2 It is 0.0 mm or more, preferably 10.0 mm or less, more preferably 8.0 mm or less, preferably 1.0 or more and 10.0 mm or less, more preferably 2.0 mm or more and 8.0 mm or less. In addition, the separation distance between the fixed end 22 of the three-dimensional guard 10 and the side edge 42s of the excretion portion middle height region 40 or the side thick portion 42 is preferably 5.0 mm or more, more preferably 6.0 mm or more. Yes, preferably 12.0 mm or less, more preferably 10.0 mm or less, more preferably 5.0 mm or more and 12.0 mm or less, and still more preferably 6.0 mm or more and 10.0 mm or less.

The width of the lateral longitudinal groove 5 and the lateral low rigidity region E, that is, the length in the width direction of the absorbent core 4 is preferably 0.5 mm or more, more preferably 1.0 mm or more, and preferably It is 3.0 mm or less, More preferably, it is 2.5 mm or less, Preferably it is 0.5 mm or more and 3.0 mm or less, More preferably, it is 1.0 mm or more and 2.5 mm or less. Further, the width of the lateral longitudinal groove portion 5 is preferably 1% or more, more preferably 3%, of the separation distance between the fixed end 22 of the three-dimensional guard 10 and the side edge 42s of the side thick portion 42. Or more, preferably 50% or less, more preferably 30% or less, preferably 1% or more and 50% or less, more preferably 3% or more and 30% or less.
In the case where a plurality of the lateral longitudinal grooves 5 are provided, the distance between the lateral longitudinal grooves and the lateral longitudinal grooves is preferably 2.0 mm or more, more preferably 5.0 mm or more.

Further, as shown in FIG. 6, the side thick portion 42 in the present embodiment has a length in the longitudinal direction X of the absorbent core 4 that decreases outward in the width direction Y of the absorbent core 4. Shape. More specifically, the absorbent core 4 has a substantially trapezoidal shape in plan view.
When the side thick part 42 has a shape in which the length in the longitudinal direction of the absorbent core 4 decreases outward in the width direction Y of the absorbent core 4, the flexibility of the excretory part facing part B It is difficult to give the wearer a sense of incongruity without greatly impairing the weight, and it is possible to prevent a decrease in absorption performance due to the displacement of the napkin 1 during wearing.

Further, as shown in FIGS. 3 and 4, the three-dimensional guard 10 in the napkin 1 of the present embodiment has a folded portion 21 that is folded outward in the width direction Y of the napkin 1, and the folded portion 21. It is not joined to the skin side sheet immediately below the surface.
Thereby, by having the folding | returning part 21 between the fixed end 22 and the free end 23 of the solid guard 10, the solid guard 10 fits a wearer's skin more flexibly. Thereby, it becomes easy to fit flexibly with respect to forward / backward and left / right movements.

  Moreover, the napkin 1 of this embodiment has a pair of wing parts 7 and 7 in the excretion part opposing part B, and the solid guard forming sheet 20 extends to the wing part 7 as shown in FIGS. The one side of the wing part 7 is formed. With such a configuration, when the wing portion 7 is pulled and fixed to the crotch portion 91 or the like, the longitudinal groove portions such as the lateral longitudinal groove portions 5 and the like are easily opened in a V shape on the skin side. , It will be easier to stand outward and more difficult to fall inside.

  As shown in FIG. 1, the skin-side sheet 2 and the absorbent core 4 are provided on the skin contact surface (surface on the skin-side sheet 2 side) of the absorbent main body 6 in the napkin 1 of the present embodiment. A pressing groove 13 that is integrally recessed toward the side is formed, and the pressing groove 13 is a pressing longitudinal groove that extends along the longitudinal direction X of the absorbent core 4 on both outer sides of the central thick portion 41. 14, the front squeezing groove 15 and the rear squeezing groove 16 formed to extend in the lateral direction Y in the front part A and the rear part C, respectively, and an intermediate area 60 between the central thick part 41 and the rear middle-high area 50. And an intermediate compressed lateral groove 17 formed so as to extend in the width direction Y. The pressing groove is formed by pressing (so-called embossing) with or without heat. In the compressed groove, the skin side sheet 2 and the absorbent core 4 are integrated (coupled).

And in the napkin 1 of this embodiment, the pair of squeezing vertical grooves 14 and 14 as the squeezing grooves 13 in which the skin-side sheet 2 and the absorbent core 4 are squeezed and integrated are respectively described above. The portions 42 and 42 are formed so as to be longitudinally cut in the longitudinal direction X of the absorbent core 4.
Since the compressed vertical grooves 14 and 14 cut the side thick portions 42 and 42 vertically, the above-described twist is less likely to occur on both sides of the absorbent core 4 and both sides of the absorbent main body 6. Moreover, generation | occurrence | production of the twist by the force added toward the inner side from the width direction outer side at the time of wear with respect to the center thick part 41 and excessive pressing force to skin can be suppressed. The compressed vertical grooves 14 are not limited to those completely parallel to the longitudinal direction X of the absorbent core 4. Further, as shown in FIG. 1, the intermediate compressed lateral groove 17 has a shape curved convexly toward the rear, and the central thick portion 41 has formed compressed grooves on the front, rear, left and right. What is necessary is just to set the width | variety (length of the direction orthogonal to a length direction) and depth of a pressing groove similarly to the pressing groove in this kind of absorbent article. The pressing groove is not limited to a straight line in a plan view, and the pressing groove may include a curved line, and the pressing groove may be composed of a row of many discontinuous point embosses. good.

  On the other hand, none of the squeezing grooves 13 such as the squeezing longitudinal grooves 14 overlaps the lateral longitudinal groove portions 5. Since the pressing groove 13 is not formed so as to overlap the side longitudinal groove portion 5, the side longitudinal groove portion is easy to open in a cross-section V shape on the skin side. Sometimes, the three-dimensional guard 10 stands firmly outward and is fixed, so that the napkin 1 is less likely to wrinkle and can be mounted ideally.

  Moreover, the whole absorptive core 4 in this embodiment is integrally molded. “Integrally molded” means that the same material is used to form parts in one process, unlike the case where members manufactured in different processes are joined by means of bonding, such as adhesives or compression. Means that

As shown in FIG. 8A, the absorbent core 4 of the napkin 1 described above has a stacking recess 55 on the outer peripheral surface, and rotates in one direction R, and the outer periphery of the stacking drum 54. It can be manufactured using a fiber stacking device provided with a duct (not shown) for supplying the core material in a scattered state on the surface.
A plurality of stacking recesses 55 are formed at regular intervals in the circumferential direction of the outer peripheral surface of the stacking drum 54. The bottom surface 56 of the accumulation recess 55 is made of a mesh plate or the like and has a large number of pores functioning as suction holes.

Further, as shown in FIG. 8 (a), two concave portions 56b and 56c for forming the excretory portion middle-high region 40 and the rear middle-high region 50 are formed on a part of the bottom surface 56 of the collecting concave portion 55. Yes. Further, at the bottom of the concave portion 56b, a breathable member 57 for forming the groove portion 44 in the excretion portion middle and high region 40 and a similar breathability for forming the groove portions 46, 47, and 49 in the excretion portion middle and high region 40 are provided. A member (not shown) is arranged. In addition, a breathable member 57 for forming the groove 51 in the rear middle / high region 50 is disposed at the bottom of the recess 56c.
Further, a non-breathable member 58 for forming the groove portions 43a, 43b, 5, 53, 61, 64 is formed on the bottom surface 56 of the accumulation concave portion 55 other than the concave portions 56b, 56c. The non-breathable members 57 and 58 are fixed so as to protrude from the bottom surface of the accumulation recess 55, and may be non-breathable members, for example, made of metal, plastic, ceramic, or the like.

  As shown in FIG. 8B, by supplying a core material such as pulp fiber into the duct while sucking from the bottom surface of the accumulation concave portion 55, as in the known fiber pile device including the fiber pile drum. In addition, the core material is deposited in a predetermined shape in the accumulation recess 55. The absorbent core 4 is obtained by releasing the deposit 400 from the accumulation recess 55. The absorbent core 4 is pressed and compressed appropriately by passing between a pair of rolls before or after coating with the core wrap sheet. As a result, the portion made of the core material deposited on the air-impermeable member in the recess 56b becomes the groove portions 44, 46, 47, 49 having a relatively small basis weight and density, and the air-impermeable member in the recess 56b is reduced. The portions accumulated on the bottom surface that do not have become small absorbing portions 45 and 48 having a relatively large basis weight and density. Further, the portion made of the core material deposited on the breathable member in the recess 56c becomes the groove portion 51 having a relatively small basis weight and density, and deposited on the bottom surface of the recess 56c that does not have the breathable member. A part becomes the small absorption part 52 with relatively large basic weight and density. Similarly, in the portions other than the concave portions 56b and 56c, the portions made of the core material deposited on the air-impermeable member 58 are the groove portions 43a, 43b, 5, 53, 61, and 64 having a relatively small basis weight and density. Thus, the portion deposited on the bottom surface that does not have the breathable member 58 becomes a portion other than the groove portion of the standard absorption region 43 having a relatively large basis weight and density. When manufacturing the absorptive core containing a water absorbing polymer, it is preferable to provide the introduction part of a water absorbing polymer in the middle of a duct.

  As the skin side sheet 2, the three-dimensional guard forming sheet 20, and the non-skin side sheet 3, those similar to those conventionally used in the technical field can be used without particular limitation. For example, as the skin side sheet 2, a liquid-permeable nonwoven fabric or a perforated film can be used. As the non-skin side sheet 3, a water-repellent nonwoven fabric having a high water pressure resistance such as a liquid-impermeable film made of a synthetic resin or a spunbond-meltblown-spunbond laminated nonwoven fabric can be used. As the three-dimensional guard forming sheet 20, a water-repellent nonwoven fabric having high water pressure resistance, such as a spunbond-meltblown-spunbond laminated nonwoven fabric or the like can be used.

Next, the sanitary napkin of 2nd Embodiment of this invention is demonstrated. About the sanitary napkin of 2nd Embodiment, a different point from 1st Embodiment is demonstrated and description is abbreviate | omitted about the same point. The points that are not particularly described are the same as those of the napkin 1 of the first embodiment, and the same components are denoted by the same reference numerals.
The absorbent core 4 of the sanitary napkin of 2nd Embodiment is provided with the side low-rigid area | region which has 5 A of side vertical groove parts. As shown in FIG. 9, the lateral longitudinal groove portion 5A includes a portion constituting a contour groove portion 53 formed outside the contour along the contour of the lateral thick portion 42 in a part of the longitudinal direction thereof. It is out.
Specifically, the lateral longitudinal groove 5A includes the longitudinal groove 53a of the contour groove 53 in the first embodiment, a portion extending forward from the front end of the longitudinal groove 53a, and the rear end of the longitudinal groove 53a. The side longitudinal groove 5A having a length extending over the entire length L2 of the side thick part 42 is formed in a straight line.
The sanitary napkin of the second embodiment can provide the same effects as the napkin 1 of the first embodiment. The description about the structure of the napkin 1 of 1st Embodiment and a more preferable structure is similarly applied to the napkin of 2nd Embodiment, as long as there is no contradiction.

As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment.
For example, the plan view shapes of the central thick portion 41 and the side thick portions 42 in the excretion portion middle-high region 40 in the present invention may be shapes as shown in FIGS. 10 (a) to 10 (f). . The rear end edge 41c of the central thick part 41 constituting the whole or part of the excretion part middle-high area 40 is a straight line along the width direction Y of the absorbent core 4 as shown in FIG. Also good. Further, the rear middle / high region 50 may be oval or elliptical, and the front edge of the rear middle / high region 50 is formed in a convex arc shape toward the front, similar to the front edge of the excretion portion middle / high region 40. May be. Further, the rear middle / high region 50 may not exist.
Further, as shown in FIG. 10B, the elliptical or elliptical central thick part 41 may have a different radius of curvature at the front end edge 41a and the rear end edge 41c in the longitudinal direction. Moreover, as shown in FIG.10 (c), the edge part other than the edge part along the side edge of the center thick part 41 may be formed in the side thick part 42 in circular arc shape. Moreover, the absorptive core 4 may not have the vertical groove part 49 between the center thick part 41 and the side thick part 42, for example, as shown in FIG.10 (d). In that case, the part which extends from the arcuate or linear side edge along the longitudinal direction of the absorbent core 4 of the central thick part 41 can be used as the side thick part 42. A portion where the basis weight or the thickness changes can be a boundary between the central thick part 41 and the side thick part 42. Moreover, as shown in FIG.10 (e), the side thick part 42 may be rectangular shape. Moreover, a pair of side thick part 42 may be formed in any one edge part of the longitudinal direction X of the central thick part 41, for example, the front end part of the central thick part 41 [FIG.10 (f). reference〕.

In addition, the lateral longitudinal groove portions 5 and 5A (lateral low rigidity regions) of the first and second embodiments are formed in a straight line shape, but are convex outward in the width direction or directed inward in the width direction. And may be convexly curved. Moreover, although the front end 5a and the rear end 5b have overlapped with the horizontal groove part 43a in the side vertical groove parts 5 and 5A (side low rigidity area | region) of 1st and 2nd embodiment, the front end 5a and the rear end 5b One may terminate at a portion that does not overlap the lateral groove 43a.
Further, the central thick portion 41 is divided forward and backward by one or a plurality of central lateral groove portions 44, while the lateral thick portion 42 is not divided forward and backward by the central lateral groove portion 47. May be. Further, the rear middle / high region 50 may also be one that is not divided forward and backward by the rear lateral groove 51.
Further, the central thick portion 41 may not be divided into left and right by the central vertical groove portion 46, and the rear middle / high region 50 may be divided into right and left by a vertical groove portion along the longitudinal direction.
Moreover, the excretion part middle-high area | region 40 may not have any one or both of a vertical groove part and a horizontal groove part.
Moreover, in the sanitary napkin of 1st and 2nd embodiment, groove parts other than the side vertical groove part 5, ie, an absorptive core, in parts other than the excretion part middle high region 40 and the back middle high region 50 of the absorbent core 4 The horizontal groove portion 43a extending in the width direction, the vertical groove portion 43b extending in the longitudinal direction of the absorbent core, the contour groove portion 53, the vertical groove portion 64 and the horizontal groove portion 61 of the intermediate region 60, etc. were formed, part or all of them. Can be eliminated.

  The thickness of the side thick part 42 may be the same as or different from that of the central thick part 41, but is preferably equal to or less than the thickness of the central thick part 41. The side thick portion 42 may have the same or different basis weight of the core material as the central thickness portion 41, but the core material has a lower basis weight than the central thickness portion 41. It is preferable that it is below the basic weight of the part 41.

  Moreover, an absorptive core may consist only of fiber materials, such as a pulp fiber, and may contain both a fiber material and a super absorbent polymer. As the fiber material, various materials conventionally used for absorbent articles of absorbent articles such as sanitary napkins, panty liners, disposable diapers and the like can be used without particular limitation. For example, pulp fibers, rayon fibers, cotton Short fibers of cellulosic fibers such as fibers, short fibers of synthetic fibers such as polyethylene, and the like are used. These fibers can be used alone or in combination of two or more. Moreover, it is preferable that the fiber material is entirely or partly pulp fiber, and the ratio of the pulp fiber in the fiber material is preferably 50 to 100% by mass, more preferably 80 to 100% by mass, More preferably, it is 100 mass%. In addition to the superabsorbent polymer, the absorbent core may contain a deodorant or an antibacterial agent as necessary.

Moreover, the absorptive core in this invention may not have any one or more of the pressing vertical groove 14, the front pressing groove 15, the back pressing groove 16, and the intermediate pressing horizontal groove 17.
Moreover, the excretion part middle-high area | region may be formed by laminating | stacking the small absorbent structure manufactured separately on a part of large absorbent structure with uniform thickness.
Moreover, as for the absorptive core in the sanitary napkin of 1st and 2nd embodiment, groove parts, such as the center longitudinal groove part 46 and the side longitudinal groove part 5, open to the upper surface side (skin side sheet | seat side) of an absorptive core. However, the absorbent core in the present invention is such that grooves such as the central longitudinal groove 46 and the lateral longitudinal groove 5 are open on the lower surface side (non-skin side sheet side) of the absorbent core. There may be.

  Moreover, the skin side sheet | seat arrange | positioned at the skin contact surface side forms the liquid absorption surface of the absorbent article with which the part arrange | positioned at least at the center part of the width direction of an absorbent article is turned to a wearer's skin side. A liquid-permeable sheet called a so-called top sheet may be used, but the fixed end of the three-dimensional guard in the present invention may be formed by fixing the three-dimensional guard forming sheet to a skin side sheet other than the top sheet. good. Examples of the skin side sheet other than the surface sheet include a sheet that forms a wing portion, a core wrap sheet, and the like.

In addition to the sanitary napkin, the absorbent article of the present invention may be other absorbent articles such as panty liners (origami sheets), incontinence pads, and disposable diapers.
The description omitted in one embodiment described above and the requirements of only one embodiment can be applied to other embodiments as appropriate, and the requirements in each embodiment can be appropriately changed between the embodiments. Can be substituted.

(Example)
A sanitary napkin in which an absorbent core of the form shown in FIGS. 2 and 5 formed from a mixed fiber of pulp fibers and a superabsorbent polymer is disposed between a skin-side sheet and a non-skin-side sheet made of the following materials. Was made. The napkin is provided in the absorbent core such that the excretion part middle and high region, the rear middle and high region, the groove part such as the central longitudinal groove part, the lateral longitudinal groove part opens to the skin side sheet side of the absorbent core, A pair of three-dimensional guards are provided on both sides of the middle and high excretion region.
Skin-side sheet: Air-through nonwoven fabric with basis weight of 30 g / m ² Non-skin-side sheet: Non-breathable polyethylene film with basis weight of 25 g / m ² The side wall thickness part has a total length L2 in the longitudinal direction X of the absorbent core. It was 30% of the full length Lx of the excretion part middle and high region, and the side longitudinal groove part had a full length L5 in the longitudinal direction X of the absorbent core of 50% of the full length Lx of the excretion part middle and high region. The width of the side longitudinal groove was 2.0 mm.
(Comparative example)
A sanitary napkin having the same configuration as that of the napkin of the example was prepared except that the side longitudinal groove portion was not formed on the absorbent core.

(Evaluation)
About the obtained sanitary napkin, the test piece of length 200mm and width 30mm was cut out from the area | region outside the side edge of a side thick part, and it preserve | saved for 24 hours in the test chamber of temperature 23 degreeC and humidity 50%. Thereafter, the sample was used as a measurement sample, and the rigidity value was measured in accordance with the handle ohm method (JIS L-1096) under the same environmental conditions.
The handle ohmmeter uses a model made by Daiei Kagaku Seiki Seisakusho: HOM-200, with the measurement sample facing the non-skin side sheet side downward and the longitudinal direction of the test piece corresponding to the longitudinal direction of the napkin being wide. The penetrator blade was lowered at a constant speed of 200 mm / min, and the maximum value indicated by the indicator (load meter) was read.

The results (average values of the measurement results of five test pieces each) are shown below.
Example: Rigidity value 50 gf (0.49 N)
Comparative example: rigidity value 140 gf (1.37 N)

  As is clear from the above results, the sanitary napkin of the example shows a lower rigidity value than the comparative example. That is, since it is deformed flexibly due to low rigidity, it becomes easier to fit the shape of the body. Further, in an actual product, the side vertical groove portion is easily bent so as to bend toward the non-skin contact surface side, and the left and right three-dimensional guards are likely to be opened in the left and right outer directions. Therefore, it is possible to effectively prevent inconveniences such as occurrence of side leakage due to the three-dimensional guard falling inward.

1 Sanitary napkin (absorbent article)
DESCRIPTION OF SYMBOLS 2 Skin side sheet 3 Non-skin side sheet 4 Absorbent core 40 Excretion part middle-high area 41 Central thick part 44 Central lateral groove part 46 Central longitudinal groove part 45 Small absorption part 42 Side thick part 47 Central lateral groove part 50 Back middle high area 51 Rear lateral groove portion 52 Small absorbent portion 43 Standard absorbent region E Side low rigidity region 5, 5A Side longitudinal groove portion 60 Intermediate region 6 Absorbent body 7 Wing portion 8 Rear flap portion 10 Solid guard 20 Solid guard forming sheet 21 Folding portion 22 Fixed end 23 Free end 11 Front raised portion (raised portion)
12 Back ridge (bump)
13 Squeeze groove

Claims (7)

Absorbent core having a shape that is long in the front-rear direction of the absorbent article, located between the skin-side sheet disposed on the skin contact surface side, the non-skin side sheet disposed on the non-skin contact surface side, and both the sheets An excretion part facing part disposed opposite to the liquid excretion part of the wearer, an anterior part disposed in front of the excretion part facing part, and a rear part disposed behind the excretion part facing part A sex product,
The absorptive core has an excretion part middle-high area with a thickness larger than a part surrounding the excretion part facing part,
The excretion part middle-high region has a shape that is long in the longitudinal direction of the absorbent core, the maximum width thereof is 1/2 or more of the width of the absorbent core,
The absorbent article includes a pair of three-dimensional guards on both sides sandwiching the excretion part middle and high regions in the excretion part facing part,
The three-dimensional guard has a fixed end in which a three-dimensional guard forming sheet is fixed to the skin side sheet, and a free end, and the free end side stands on the wearer's skin side from the fixed end. And
Between the side edge of the excretion part middle-high region in the width direction of the absorbent core and the fixed end, the lateral lowness that is lower in the bending direction in the width direction than other regions extends in the longitudinal direction of the absorbent core. rigidity region is formed,
The excretion portion middle-high region has a central thick portion that is long in the longitudinal direction of the absorbent core, and both side edges of the central thick portion in the region closer to the front portion and in the region closer to the rear portion. A lateral thick portion extending outward in the width direction from each of the lateral thick portions, and the lateral low rigidity region is between the lateral edge of the lateral thick portion and the fixed end. An absorbent article located in The absorptive article according to claim 1 in which said side low rigidity field is formed so that the full length of said side thick part may be covered. The absorptive article according to claim 1 or 2 in which said side low rigidity field has a side longitudinal slot which is a ditch. A central low basis weight portion extending in the longitudinal direction of the absorbent core is formed in the excretion portion middle high region, and the central low basis weight portion and the lateral low rigidity region are skin contact surfaces of the absorbent core. The absorbent article according to any one of claims 1 to 3 , wherein the absorbent article is formed on a side surface. The solid guard has a folded portion folded back outward in the width direction of the absorbent article, is not bonded to the skin-side sheet immediately below the said folded portion, any claim 1-4 The absorbent article of Claim 1. A pair of wing portions on the excretion portion facing section, the three-dimensional guard forming sheet is extended to the wing portion is formed on one side of the wing portion, any one of claims 1 to 5 Absorbent article as described in 1. A pressing groove is formed in which the skin side sheet and the absorbent core are integrally recessed toward the non-skin side sheet side, and the pressing groove does not overlap the lateral low rigidity region, The absorptive article according to any one of claims 1 to 6 .

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