JP2015097715A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article which has absorbency in an excretion part-facing part and flexibility in a rear part, can stably absorb without the breaking by being twisted when being worn, and can reliably prevent leakage in the back.SOLUTION: An absorbent article 1 is provided with an absorbent core 4 shaped to be long in a front-back direction of the absorbent article and has an excretion part-facing part B arranged to face a liquid excretion part of a wearer and a rear part C that is arranged in the back with respect to the excretion part-facing part. The absorbent core 4 has a front projecting region 41 in a central part in a width direction of the excretion part-facing part B and a rear projecting region 42 in a central part in a width direction of the rear part C. The front projecting region 41 and the rear projecting region 42 are respectively thicker than a thickness of a peripheral region 43 of the absorbent core and are respectively partitioned by groove parts 44, 47 extending in a width direction Y of the absorbent core to form a plurality of small absorbing parts 45, 48 aligned in a longitudinal direction X of the absorbent core 4. A length c of a small absorbing part 48 in the rear projecting region 42 is shorter than a length b of the small absorbing part 45 in the front projecting region 41.

Description

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

Conventionally, in the absorbent article having a long length in the longitudinal direction along the wearer's front-rear direction, like a sanitary napkin for night suitable for use at bedtime, there is a gap with the wearer's skin, In the sleeping position, the liquid may flow along the surface of the skin and flow into the buttocks, leading to liquid leakage.
For this reason, a technique is known that improves the fit to the body by forming a thick part at the absorbent body of the absorbent article and forming a raised part on the skin facing surface. However, when the raised portion is formed by partially increasing the basis weight of the absorbent body, the raised portion has high rigidity, is difficult to bend, or bends strongly at one place. On the other hand, there was a case where a gap was likely to occur.
Moreover, although patent document 1 proposes to divide the middle and high parts formed in the absorbent body into the front and back to reduce the gap between the body and the body, it is insufficient as the flexibility to fit the buttocks. there were. In order to improve the fit, it has been proposed to block the absorber in the buttock-corresponding region, but when the absorber is formed as a single layer, it is too flexible and blocks the absorber due to twisting during wearing. There was a concern that separation would occur and leakage would occur.

JP 2006-239162 A JP 2012-143535 A

  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 includes an absorbent core having a shape that is long in the front-rear direction of the absorbent article, and an excretory part-facing part that is disposed to face the liquid excretion part of the wearer and a rear part that is arranged behind the excretion part-facing part. In the absorbent article, the absorbent core has a front middle and high area in the center in the width direction of the excretory part facing part, and a rear middle and high area in the center in the width direction of the rear part. Each of the front middle height region and the rear middle height region is thicker than the thickness in the peripheral region of the absorbent core, and is divided by a groove extending in the width direction of the absorbent core. A plurality of small absorbent portions arranged along the longitudinal direction are formed, and the length in the longitudinal direction of the small absorbent portion in the rear middle / high region is the longitudinal direction of the small absorbent portion in the front middle / high region. Takes shorter than the length, it is to provide an absorbent article.

  According to the absorbent article of the present invention, it has both the absorbability at the excretory part facing part and the flexibility at the rear part, and can be stably absorbed without being broken when worn and reliably preventing back leakage Can do.

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 schematic cross-sectional view showing a deformed state of the absorbent core when the sanitary napkin of FIG. 1 is worn. 6 (a) and 6 (b) are schematic views showing a cross-section along the circumferential direction of the fiber drum preferably used for manufacturing the absorbent core of the sanitary napkin shown in FIG. FIG. 6A is a diagram illustrating a state before the absorbent core forming material is deposited in the accumulation recess, and FIG. 6B is a diagram illustrating a state in which the absorbent core formation material is deposited in the accumulation recess. 7A to 7C are plan views showing an absorbent core according to another embodiment of the present 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 napkin 1) as a first embodiment of the absorbent article of the present invention is a night napkin suitable for use at bedtime. Those having a total length of 30 cm or more are suitable.
As shown in FIG. 1, the napkin 1 has an absorbent main body 6 that is long in the front-rear direction, a pair of wing portions 7, 7, and a pair of rear flap portions 8, 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 a front part A, a liquid excretion part facing part B, and a rear part C in the front-rear direction X, and a pair of wing parts 7 on the left and right sides of the absorbent main body 6 in the liquid excretion part facing part B. , 7, a pair of rear flap portions 8, 8 are provided on the left and right sides of the absorbent main body 6 in the rear portion C.

  In the absorbent article of the present invention, the excretory part-facing part B is a part where the wearer's liquid excretion part (vaginal opening or the like) is disposed opposite to the central part in the width direction, and the front part A is the liquid excretion part. It is a part arranged on the wearer's front side (abdominal side) from the facing part B, and the rear part B is a part arranged on the wearer's back side from the liquid 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). Moreover, in this specification, a skin opposing surface is a surface turned to a wearer's skin side at the time of wear in an absorbent article or its component, and a non-skin opposing surface is at the time of wear in an absorbent article or its component. It is a surface directed to the side opposite to the wearer's skin side (clothing side).

  As shown in FIG. 3 or 4, the napkin 1 is disposed between the skin-side sheet 2 that forms the skin-facing surface, the non-skin-side sheet 3 that forms the non-skin-facing surface, and both the sheets 2 and 3. An absorbent core 4 is provided. The skin-side sheet 2 includes a liquid-permeable surface sheet 2a and a pair of three-dimensional guard forming sheets 2b and 2b joined to both sides thereof. The liquid permeable top sheet 2 a 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. The three-dimensional guard forming sheet 2b 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 joined slightly outward from the folded portion 21 in the width direction. In the part 22, it is joined on the surface sheet 2a. The three-dimensional guard forming sheet 2b has a three-dimensional guard-forming elastic member 24 in the vicinity of the side edge 23 that forms the free end of the three-dimensional guard. A space between the joint portion 22 and the side edge portion 23 in the excretory portion facing portion B rises toward the wearer's skin side to form the three-dimensional guard 10.

  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 2 b 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 facing surface of the crotch portion of the shorts is provided on the surface made of the non-skin side sheet 3 of each of the pair of wing portions 7, and the non-skin facing surface of the absorbent main body 6 Is provided with a main body adhesive portion (not shown) for fixing the main body 6 to the inner surface of the shorts. 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 that covers the skin facing surface side of the absorbent core 4 and between the non-skin side sheet 3 and the core wrap sheet that covers the non skin facing surface side of the absorbent core 4. The gaps are preferably joined to each other by a pattern-coated adhesive such as dots, spirals or 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 direction orthogonal to the front-rear direction X of the napkin 1.
In addition, the absorbent core 4 has a front middle / high area 41 at the center in the width direction Y of the excretory part facing part B of the napkin 1 and a rear middle / high area 42 at the center in the width direction Y at the rear part C. doing.

  In the napkin 1, the front bulge protruding toward the wearer's skin side at the center in the width direction of the skin facing surface in the excretory part facing part B due to the presence of the front middle and high region 41 under the top sheet 2a. The portion 11 is formed, and the rear middle-high region 42 is present under the top sheet 2a, so that it projects toward the wearer's skin side at the center in the width direction of the skin facing surface in the rear portion C. A rear raised portion 12 is formed. It is preferable that the rear bulge portion 12 is disposed to face the wearer's crack when the napkin 1 is worn.

The front middle-high area 41 is an area thicker than the thickness in the peripheral area 43 of the absorbent core 4 and is formed in the excretory part facing part B. The front middle / high area 41 may be formed only in the excretory part facing part B, but extends from the excretion part facing part B to a part of the rear part C as shown in FIG. 1 or FIG. Preferably it is.
Further, the front middle-high region 41 is divided by a groove portion 44 extending in the width direction of the absorbent core 4, whereby the absorbent core 4 has a plurality of small portions arranged along the longitudinal direction X of the absorbent core. Absorbing portion 45 is formed. Further, in the present embodiment, a groove portion 46 extending in the longitudinal direction X of the absorbent core 4 is formed at the center in the width direction of the front middle / high region 41, and the small absorption portion in the front middle / high region 41 is formed by the groove portion 46. 45 is divided in the width direction Y of the absorbent core 4.

  The peripheral region 43 of the absorbent core 4 is an annular region that collectively surrounds the front middle-high region 41 and the rear middle-high region 42. The thickness of the front middle / high region 41 is the thickness of the portion other than the groove (the groove 44 and the groove 46) in the front middle / high region 41, and is the same as the thickness of the small absorbing portion 45. The thickness of the peripheral region 43 of the absorbent core 4 compared with the thickness of the front middle / high region 41 is the thickness of the portion located on the left and right sides of the front middle / high region 41 in the peripheral region 43 of the absorbent core 4. When the groove part such as the groove part 51 extending in the width direction Y of the absorbent core 4 or the groove part 52 extending in the longitudinal direction Y of the absorbent core 4 is also formed in the peripheral region 43 of the absorbent core 4. Is the thickness at a portion where such a groove does not exist.

The thickness of the front middle-high region 41 is absorptive from the viewpoint of forming the front raised portion 11 protruding toward the skin on the skin facing surface of the napkin 1 and improving the liquid absorbability and the like in the excretory portion facing portion B. The thickness of the peripheral region 43 of the core 4 is preferably 150% or more, more preferably 200% or more, preferably 500% or less, more preferably 300% or less, and preferably 150% or more and 500%. % Or less, more preferably 200% or more and 300% or less. Further, the difference in thickness between the thickness of the front middle-high region 41 and the thickness of the peripheral region 43 of the absorbent core 4 (the former-the latter) is preferably 2 mm or more, more preferably 3.5 mm or more, and preferably It is 8 mm or less, More preferably, it is 6 mm or less, Preferably it is 2 mm or more and 8 mm or less, More preferably, it is 3.5 mm or more and 6 mm or less.
Further, in the front middle / high region 41 of the absorbent core 4, the thickness in the groove portions 44, 46 is preferably 67% or less of the thickness of the portion other than the groove portion (same as the thickness of the front middle / high region 41 and the small absorbent portion 45). It is preferably 45% or less, preferably 25% or more, more preferably 35% or more, and preferably 25% or more and 67% or less, more preferably 35% or more and 45% or less.
In addition, the thickness in each part of an absorbent core is measured from the photograph of the cut end surface of the absorbent article under no load.

The rear middle / high region 42 is a region thicker than the thickness in the peripheral region 43 of the absorbent core 4, and is formed in the rear portion C. Further, the rear middle / high region 42 is formed behind the front middle / high region 41 in the longitudinal direction X of the absorbent core 4.
The rear middle / high region 42 is also divided by a groove 47 extending in the width direction of the absorbent core 4, whereby the absorbent core 4 has a plurality of small absorbent portions arranged along the longitudinal direction X of the absorbent core. 48 is formed. Moreover, in this embodiment, the groove part extended in the longitudinal direction X of the absorptive core 4 is not formed in the back middle high region 42, and the small absorption part 48 in the back middle high region 41 is the width | variety of the absorptive core 4. It is not divided in the direction Y.

  The thickness of the rear middle / high region 42 is the thickness of the portion other than the groove portion (groove portion 47) in the rear middle / high region 42, and is the same as the thickness of the small absorbing portion 48. The thickness of the peripheral region 43 of the absorbent core 4 compared with the thickness of the rear middle / high region 42 is the thickness of the portion located on the left and right sides of the rear middle / high region 42 in the peripheral region 43 of the absorbent core 4. As described above, the groove 51 extending in the width direction Y of the absorbent core 4 and the groove extending in the longitudinal direction Y of the absorbent core 4 both in the peripheral region 43 of the absorbent core 4 and in the peripheral region 43 of the absorbent core 4. In the case where a groove portion such as 52 is formed, it is the thickness at a portion where such a groove portion does not exist.

The thickness of the rear middle-high region 42 is absorbable from the viewpoint of forming a rear raised portion 12 that protrudes toward the skin on the skin-facing surface of the napkin 1 to improve fit to the body (preferably rupture). The thickness of the peripheral 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 and 300%. % Or less, more preferably 180% or more and 230% or less. Further, the difference in thickness between the thickness of the rear middle-high region 42 and the thickness of the peripheral region 43 of the absorbent core 4 (the former-the latter) is preferably 0.9 mm or more, more preferably 2.7 mm or more, Preferably it is 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.
Further, the rear middle high region 42 of the absorbent core 4 is preferably 75% or less, more preferably the thickness of the groove portion 47 is equal to the thickness of the portion other than the groove portion (same as the thickness of the rear middle high region 42 and the small absorbent portion 48). It is 55% or less, preferably 30% or more, more preferably 40% or more, and preferably 30% or more and 75% or less, more preferably 40% or more and 55% or less.

  In the present embodiment, the front middle-high region 41 and the rear middle-high region 42 each increase the basis weight of the material for forming the absorbent core 4 (hereinafter also referred to as “core material”) rather than the peripheral region 43 of the absorbent core 4. Is formed. That is, the basis weight of the core material is larger than the basis weight in the peripheral region 43 of the absorbent core 4 in each of the small absorbent portion 45 in the front middle-high region 41 and the small absorbent portion 48 in the rear middle-high region 42. Since the absorbent core 4 in the present embodiment has a difference in the basis weight of the core material to provide a thickness difference, a case where a thickness difference is provided by compressing a part of the absorbent core having a uniform basis weight is described. In contrast, the absorbent core 4 is also flexible as a whole in the peripheral region 43.

Further, in the absorbent core 4 of the present embodiment, the groove portions 44 and 46 in the front middle and high region 41 and the groove portion 47 in the rear middle and high region 42 are all made of core material and other materials in the front middle and high region 41 and the rear middle and high region 42. It is formed to be less than the part. That is, the front middle-high region 41 has a lower basis weight of the core material in the groove portions 44 and 46 than the basis weight of the core material in the small absorbent portion 45, and the rear middle-high region 42 has the core material in the groove portion 47. Is smaller than the basis weight of the core material in the small absorbent portion 48.
Further, unlike the case where a groove portion formed by compressing a part of a portion having a uniform basis weight is provided, the front middle / high region 41 has a density of the core material in the groove portions 44 and 46 higher than a density in the small absorption portion 45. Also, the density of the core material in the groove 47 is lower than the density in the small absorption part 48 in the rear middle / high region 42 as well.

  The basis weight of the core material in the groove portions 44, 46, and 47 is obtained by cutting and cutting the boundary between the groove portion and the other portions, and calculating the mass of the narrow sample by the area of the surface facing the skin of the sample. Divide and seek. The basis weight of the part other than the groove part is obtained by dividing the mass of the sample obtained by cutting out the part other than the groove parts 44, 46, 47 by the area of the surface of the sample facing the skin.

Moreover, in the absorptive core 4 of this embodiment, as shown in FIG. 2, the length c in the longitudinal direction X of the absorptive core 4 of the small absorption parts 48 and 48 in the back middle high region 42 is a front middle high region. .. Are shorter than the length b in the longitudinal direction X of the absorbent core 4. On the other hand, the groove 44 in the rear middle / high region 42 and the groove 47 in the front middle / high region 41 have the same length in the longitudinal direction X of the absorbent core 4.
In the example shown in FIG. 2, the five small absorbent portions 45 formed in the front middle-high region 41 have the same length b in the longitudinal direction X of the absorbent core 4, and the rear middle-high region 42 has The two small absorbent portions 48 formed have the same length c in the longitudinal direction X of the absorbent core 4, but have different lengths in the front middle-high region 41 and / or the rear middle-high region 42. When there is a small absorption portion, the average value of the small absorption portion in the front middle-high region 41 is compared with the average value of the small absorption portion in the rear middle-high region 42 to thereby determine the length of the small absorption portion in the rear middle-high region 42. Is determined to be shorter than the length of the small absorption part of the front middle-high area 41.

According to the napkin 1 of the present embodiment, the absorbent core 4 is divided into a plurality of small absorbent parts 45 by the groove part 44 in the front middle / high area 41 formed in the liquid excretion part facing part B, and the rear part C. The rear middle-high region 42 formed in the rear is also divided into a plurality of small absorption portions 48 by the groove portion 47, and the length c of the small absorption portion 48 in the rear middle-high region 42 is the length b of the small absorption portion 45 in the front middle-high region 41. Therefore, the portion having the front middle-high area 41 in the longitudinal direction X of the napkin 1 fits the wearer's liquid excretion part, and excretion liquid such as menstrual blood excreted from the liquid excretion part is rapidly absorbed. Excellent absorbency. Moreover, as shown in FIG. 5, the part which has the back middle-high area | region 42 in the back part C curves flexibly so that a skin surface shape with a small curvature radius behind a wearer's liquid excretion part may be followed, and liquid excretion It fits well also to the buttock facing part behind the part, thereby preventing the back leakage due to the liquid flowing backward along the surface of the skin.
Furthermore, unlike the case where the entire absorbent core 4 is simply thinned or the absorbent core 4 having a uniform thickness is divided into blocks, the thickness and basis weight of the front middle-high region 41 and the rear middle-high region 42 are maintained. However, since it was made flexible, the sanitary napkin is not easily twisted, the absorbent core 4 is not broken, and the absorption capacity is not insufficient.
As described above, the sanitary napkin 1 according to the present embodiment has both the absorbability in the excretory part-facing part B and the flexibility in the rear part C, and can be stably absorbed without being broken when worn. Can be reliably prevented.

Further, in the napkin 1 of the present embodiment, the groove portions 44, 46, 47, 51, 52 described above are formed on the skin facing surface of the absorbent core 4, but on the non-skin facing surface of the absorbent core 4. Is formed with a continuous layer 59 that is not divided by the grooves. The continuous layer 59 is formed within a certain thickness range from a part of the absorbent core 4 in the thickness direction, more specifically from the non-skin facing surface of the absorbent core 4.
The continuous layer 59 in which the absorbent core 4 is not divided by any of the groove portion 44 in the front middle-high region, the groove portion 47 in the rear middle-high region, and the intermediate region 53 between the front middle-high region 41 and the rear middle-high region 42. Therefore, the absorbent core 4 can be prevented from being broken when worn and absorbed and fixed while diffusing the liquid absorbed by each small absorbent portion to the adjacent small absorbent portion and the peripheral region through the continuous layer. Can be used efficiently and leakage can be reliably prevented.
As shown in FIG. 2, the intermediate region 53 is located between the front middle-high region 41 and the rear middle-high region 42, and has a small thickness of the small absorbing portion 45 of the front middle-high region 41 and the rear middle-high region 42. This is a region that is thinner than the thickness of each of the absorbing portions 48.

Moreover, since the basic weight of the core material in the groove parts 44 and 46 is lower than the basic weight of the core material in the small absorption part 45, the front middle high region 41 in this embodiment has the groove part formed by compression by embossing etc. Compared to the case, the rigidity is low and the deformation of the core is difficult to be prevented. As a result, the napkin 1 is more excellent in leak-proofing property because the fitting property to the wearer's liquid excretion portion is enhanced.
From this point of view, the front middle-high region 41 has a basis weight of the core material in the groove portions 44, 46, preferably 67% or less, more preferably 45%, of the basis weight of the core material in the portion other than the groove portions 44, 46. Or less, preferably 25% or more, more preferably 35% or more.

Moreover, since the basis weight of the core material in the groove part 47 is lower than the basis weight of the core material in the small absorption part 48, the back middle high region 42 in this embodiment has a groove part formed by compression by embossing or the like. Compared to the above, the rigidity is low and the deformation of the core is difficult to be prevented. Thereby, the napkin 1 is flexibly curved so as to follow the skin shape with a small radius of curvature behind the wearer's liquid excretion part, and fits well to the buttocks facing part behind the liquid excretion part. It will be more excellent in leakage prevention.
From such a point of view, the rear middle-high region 42 has a basis weight of the core material in the groove portion 47 that is preferably 75% or less, more preferably 55% or less of the basis weight of the core material in a portion other than the groove portion 47, Further, it is preferably 30% or more, more preferably 40% or more.

  Moreover, as for the absorptive core 4 in this embodiment, the average of the area of the small absorption part 48 in the back middle high region 42 is smaller than the average of the area of the small absorption part 45 in the front middle high region 41. As a result, the rear portion C having the rear middle-high region 41 can be deformed more flexibly, and the napkin 1 is further excellent in the back leakage prevention property in the sleeping state. From the viewpoint of more reliably obtaining such an effect, the average area of the small absorbent portions 48 in the rear middle-high region 42 is preferably 95% or less of the average area of the small absorbent portions 45 in the front middle-high region 41. More preferably, it is 90% or less, preferably 15% or more, more preferably 50% or more, and preferably 15% or more and 95% or less, more preferably 50% or more and 90% or less. In addition, like the small absorption part 45 of the front middle high region in this embodiment, when the small absorption part is divided | segmented into the width direction Y by the groove part 46 along the longitudinal direction X, of the part divided | segmented in the width direction Let each area be the area of the small absorption part.

Further, as shown in FIG. 2, the absorbent core 4 in the present embodiment has a longitudinal length d (see FIG. 2) between the front middle-high region 41 and the rear middle-high region 42 in the longitudinal direction X. 2) is wider than the length in the same direction of each of the groove portion 44 of the front middle-high region 41 and the groove portion 47 of the rear middle-high region 42, and an intermediate region 53 having a thickness equivalent to the thickness in the peripheral region 43 of the absorbent core is formed. Has been.
By having an intermediate region 53 having a longer longitudinal length than the grooves 44 and 47 between the front middle / high region 41 and the rear middle / high region 42, deformation of the portion having the front middle / high region 41 during wearing of the napkin 1 It is possible to suppress the state from affecting the deformation state of the portion having the rear middle / high region 42, and the absorbability by the front middle / high region 41 and the fit in the rear portion C can be improved in a balanced manner.
Furthermore, since the thickness of the intermediate region 53 is equal to the thickness in the peripheral region 43 of the absorbent core 4, the deformation state of the portion having the front middle / high region 41 affects the deformation state of the portion having the rear middle / high region 42. The twist during wearing can be prevented while exhibiting the effect of suppressing this.

From the viewpoint of obtaining the above-described effect by the intermediate region 53 more reliably, the length d (see FIG. 2) of the intermediate region 53 is set so that the groove portion 44 of the front middle-high region 41 and the groove portion 47 of the rear middle-high region 42 respectively. The length in the same direction is preferably 2 times or more, more preferably 3 times or more, preferably 25 times or less, more preferably 20 times or less, and preferably 2 times or more. 25 times or less, more preferably 3 times or more and 20 times or less.
From the same viewpoint, the length d (see FIG. 2) of the intermediate region 53 is preferably 15 mm or more, more preferably 20 mm or more, and preferably 35 mm or less, more preferably 30 mm or less. Preferably they are 15 mm or more and 35 mm or less, More preferably, they are 20 mm or more and 30 mm or less. Further, the thickness of the intermediate region 53 is equivalent to the thickness in the peripheral region 43 of the absorbent core is that the thickness of the intermediate region 53 is 80% or more and 120% or less of the thickness in the peripheral region 43 of the absorbent core. This ratio is more preferably 90% or more and 110% or less.

  As shown in FIGS. 1 and 4, the surface sheet 2 a and the absorbent core 4 are provided on the non-skin side sheet 3 on the skin facing surface (surface on the surface sheet 2 a side) of the absorbent main body 6 in the napkin 1 of the present embodiment. A linear groove 60 that is integrally recessed toward the side is formed, and the linear groove 60 extends on both sides of the front middle-high region 41 along the longitudinal direction X of the absorbent core 4. 61, a front groove 62 and a rear groove 63 formed in the front part A and the rear part C, respectively, so as to extend in the lateral direction Y, and an intermediate region 53 between the front middle-high region 41 and the rear middle-high region 42, And an intermediate lateral groove 64 formed so as to extend in the width direction Y. A linear groove | channel can be formed in accordance with a conventional method by embossing, such as a pressing process (what is called embossing) with or without heat (what is called embossing), or ultrasonic embossing. In the linear groove, the topsheet 2a and the absorbent core 4 are integrated (coupled). The napkin 1 and the absorbent core 4 of the present embodiment are formed symmetrically with respect to a center line (not shown) that bisects the absorbent main body 6 in the width direction Y, as shown in FIG. Has been.

  What is necessary is just to set the width | variety (length of the direction orthogonal to the length direction of a linear groove) and depth of a linear groove similarly to the linear groove in this kind of absorbent article. In addition, “linear” in the linear groove is not limited to a straight line in the plan view, but includes a curved line, and each line may be a continuous line or a broken line. For example, the linear groove may be composed of a row formed by a large number of discontinuous point embosses.

The intermediate lateral groove 64 functions as a bending guide part. The front middle-high region 41 and the rear middle-high region 42 have an intermediate lateral groove 64 that functions as a bending guide portion in an intermediate region 53 between them, and is linked to the movement of the wearer's body starting from the intermediate lateral groove 64. Can be moved separately. For this reason, the effect which prevents the influence of a mutual deformation | transformation is heightened between the front middle / high region 41 and the back middle / high region 42, and since it is hard to leak and does not inhibit a wearer's movement, it has a comfortable wearing feeling.
On the other hand, the longitudinal groove 61, the front groove 62, and the rear groove 63 suppress liquid diffusion in a direction flat with the skin facing surface of the sanitary napkin 1, and effectively prevent liquid leakage from the periphery of the napkin 1. Can do. In addition, as shown in FIG. 1, the intermediate lateral groove 64 (folding guide part) in the present embodiment has a shape curved convexly toward the rear, but the bending guide part such as the intermediate lateral groove in the present invention is formed in the width direction. It may extend linearly in Y, or may have a shape that curves convexly toward the front.

  Further, as described above, in the absorbent core 4 in the present embodiment, the groove portion 46 extending in the longitudinal direction X of the absorbent core is formed in the front middle-high region 41, and the groove portion 46 reduces the small size in the front middle-high region. The absorption part 45 is divided | segmented into the width direction Y of an absorptive core. Therefore, the drawability of the liquid in the front middle and high region 41 is further improved, and the liquid leakage prevention property is further improved.

  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. 6A, 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. 6A, two concave portions 56b and 56c for forming the front middle / high region 41 and the front middle / high region 42 are formed on a part of the bottom surface 56 of the concave portion 55 for accumulation. . Further, a breathable member 57 for forming the groove portions 44 and 46 in the front middle and high region 41 is disposed at the bottom portion of the concave portion 56b, and the groove portion 47 is formed in the rear middle and high region 42 at the bottom portion of the concave portion 56c. A non-breathable member 57 is provided for this purpose. Further, a non-breathable member 58 for forming the groove portions 51 and 52 is formed on the bottom surface 56 of the accumulation recess 55 other than the recesses 56b and 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. 6B, 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 a known fiber pile device including a 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 40 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. Thereby, the part which consists of a core material deposited on the air-impermeable member 57 becomes the groove parts 44, 46, 47 with relatively small basic weight and density, and does not have the air-impermeable member 57 in each recessed part 56b, 56c. The portions deposited on the bottom surface become small absorbing portions 45 and 48 having a relatively large basis 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-permeable member 58 become the groove portions 51 and 52 having a relatively small basis weight and density, and the air-permeable member 58 is formed. 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. 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 surface sheet 2a, the three-dimensional gathering sheet 2b, 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 top sheet 2a, 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. Further, as the three-dimensional guard forming sheet 2b, a water-repellent nonwoven fabric having a high water pressure resistance, such as a spunbond-meltblown-spunbond laminated nonwoven fabric, or the like can be used.

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, in the napkin 1 of the above-described embodiment, the small absorbent portion 45 of the front middle-high region 41 is divided in the width direction by the groove 46 extending in the longitudinal direction of the absorbent core. The small absorbent portion 45 may not be divided in the width direction by a groove portion extending in the longitudinal direction of the absorbent core (see FIG. 7A). In addition, the small absorption part 48 of the back middle high region 42 may also be divided by a groove part extending in the longitudinal direction of the absorbent core. In the absorbent core according to the present invention, the front middle-high region 41 and the rear middle-high region 42 are divided into a plurality of small absorbent portions 45, 48 by grooves 44, 47 extending in the lateral direction, respectively. 41 and the small absorption parts 45 and 48 of the back middle-high area 42 may be divided | segmented in the width direction by the groove part 46 extended in a longitudinal direction. Further, the mode of division may be a mode as shown in FIG.

Moreover, in the napkin 1 of embodiment mentioned above, it extends in the longitudinal direction of the absorptive core and the groove part 51 extended in the width direction of an absorptive core in parts other than the front middle high region 41 and the back middle high region 42 of the absorptive core 4. Although the groove part 52 was formed, it is also possible to eliminate one or both of them.
Further, as the bending guide portion formed in the intermediate region 53 between the front middle-high region 41 and the rear middle-high region 42, a plurality of deep recesses are intermittently formed instead of a linear groove such as the intermediate lateral groove 64. Dot-like embossing may be provided. Further, the bending guide part may not be provided in the intermediate region 53.

Moreover, as shown in FIG.7 (c), the side bulging parts 49 and 49 which bulge outward of the width direction of the absorptive core 4 may be formed in the both sides on both sides of the front middle-high area | region 41. preferable. The thickness of the side bulging portions 49, 49 may be the same as the thickness of the small absorbing portion 45 in the front middle / high region 41, but is preferably thinner than the small absorbing portion 45 in the front middle / high region 41.
By providing the laterally bulging portions 49, 49, sufficient absorption performance is exhibited even if the mounting position is slightly shifted, and twisting is less likely to occur, so that there is no sense of incongruity and liquid leakage prevention properties are improved.
It is preferable that the side bulging portions 49 and 49 are also divided in the longitudinal direction of the absorbent core 4 by a groove portion 44 extending in the width direction of the absorbent core 4, and the front middle / high region 41 and the side bulging portion are divided. Between 49, it is preferable to provide a groove part thinner than these two parts.

  Further, the grooves 44, 46, 47 of the front middle / high region 41 and the rear middle / high region 42 are formed by compressing and compressing a part of the front middle / high region 41 and the rear middle / high region 42 having a uniform basis weight by embossing, respectively. It may be what you did. Further, the grooves 51 and 52 formed in portions other than the front middle and high region 41 and the rear middle and high region 42 are formed by partially compressing and compressing portions other than the front middle and high region 41 and the rear middle and high region 42, respectively. There may be.

In the front middle and high region 41, the number of small absorbent portions 45 arranged in the longitudinal direction X of the absorbent core 4 (5 in the above-described embodiment, 3 in the example shown in FIG. 7B) is 2 or more. , Preferably 3 or more, preferably 10 or less, more preferably 5 or less.
In the rear middle-high region 42, the number of small absorbent portions 48 arranged in the longitudinal direction X of the absorbent core 4 (two in the above-described embodiment) is two or more, preferably five or less, more preferably 3 or less.

  Further, like the napkin 1 of the present embodiment, the grooves 44, 46, 47 are collinear with the widthwise outer part and the peripheral area in the front-rear direction of the front middle-high area 41 and the rear middle-high area 42 of the absorbent core 4. It is preferable that a lateral groove or a longitudinal groove located in the region is present because the diffusibility of body fluid is improved and the followability to the operation during wearing is increased.

  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, and disposable diapers 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.

  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 replaced with

This invention discloses the following absorbent articles further regarding embodiment mentioned above.
<1> An absorbent core having a shape that is long in the front-rear direction of the absorbent article, and having 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. In the absorbent article, the absorbent core has a front middle and high region at a center portion in the width direction of the excretory portion facing portion, and a rear middle and high region at a center portion in the width direction of the rear portion. The front middle-high region and the rear middle-high region are each thicker than the thickness in the peripheral region of the absorbent core, and are divided by grooves extending in the width direction of the absorbent core, respectively, and the longitudinal length of the absorbent core A plurality of small absorbent parts arranged in the direction are formed, and the length of the small absorbent part in the rear middle / high region in the longitudinal direction is the longitudinal direction of the small absorbent part in the front middle / high region. Absorbent article that is shorter than the length.
<2> The absorbent article according to <1>, wherein the absorbent core includes a continuous layer that is not divided over the entire surface direction.
<3> The basis weight of the material for forming the absorbent core in the groove portion is larger than the basis weight of the material for forming the absorbent core in the small absorbent portion in each of the front middle-high region and the rear middle-high region. The absorbent article according to <1> or <2>, which is low.
<4> The average of the area of the small absorption part in the rear middle / high area is smaller than the average of the area of the small absorption part in the front middle / high area, according to any one of <1> to <3>. Absorbent articles.
<5> The length of the absorbent core in the longitudinal direction between the front middle-high region and the rear middle-high region in the longitudinal direction of the absorbent core is a groove portion in the front middle-high region and a groove portion in the rear middle-high region. In any one of the above <1> to <4>, an intermediate region that is longer than the length in the longitudinal direction and has a thickness equivalent to the thickness in the peripheral region of the absorbent core is formed. The absorbent article as described.
<6> The absorbent article according to <5>, wherein a bending guide portion extending in a width direction of the absorbent core is formed in the intermediate region.
<7> A groove portion extending in the longitudinal direction of the absorbent core is formed in the front middle-high region, and the small absorbent portion in the front middle-high region is divided in the width direction of the absorbent core by the groove portion. The absorbent article according to any one of <1> to <6>.
<8> The absorbent article according to any one of <1> to <7>, wherein a groove extending in a longitudinal direction of the absorbent core is not formed in the rear middle-high region.
<9> Any one of the above <1> to <8>, wherein side bulging portions that bulge outward in the width direction of the absorbent core are formed on both sides of the front middle-high region. Absorbent articles described in 1.
<10> A groove extending in the width direction is disposed in a peripheral region of the absorbent core, and the basis weight of the material for forming the absorbent core is lower in the groove than in a portion other than the groove portion in the peripheral region. The absorbent article according to any one of> to <9>.

<11> In the peripheral region of the absorbent core, a groove extending in the longitudinal direction is disposed, and in the groove, the basis weight of the absorbent core forming material is lower than the portion other than the groove portion in the peripheral region. The absorbent article according to any one of> to <10>.
<12> The absorbent article according to any one of <1> to <11>, wherein the rear middle-high region has a width direction length smaller than that of the front middle-high region.
<13> In the intermediate region, a groove extending in the width direction is disposed, and in the groove, the basis weight of the absorbent core forming material is lower than the portion other than the groove portion in the peripheral region, <1> to <12 > The absorbent article as described in any one of>.
<14> In the intermediate region, a groove extending in the longitudinal direction is disposed, and in the groove, the basis weight of the absorbent core forming material is lower than the portion other than the groove portion in the peripheral region, <1> to <13 > The absorbent article as described in any one of>.
<15> The groove extending in the longitudinal direction of the front middle and high region is collinear with the groove extending in the longitudinal direction of the peripheral region and the intermediate region, and the rear middle and high region is at least one of the above The absorbent article as described in any one of said <1>-<14> located on the same line.
<16> The absorbent article according to any one of <1> to <15>, wherein the groove portion extending in the width direction of the rear middle-high region is on the same line as the groove extending in the width direction of the peripheral region. .
<17> The absorbent article according to any one of <1> to <16>, wherein the absorbent core is configured by integral molding.
<18> In the peripheral region in the rear portion, the absorbent core is partitioned into a rear peripheral region small absorbent portion by a groove extending in the width direction and a groove extending in the longitudinal direction, and than the rear peripheral region small absorbent portion, The absorbent article according to any one of <1> to <17>, wherein the area of the small absorbent portion in the rear middle and high region is smaller.
<19> The absorbent article according to any one of <1> to <18>, wherein the front middle-high region and the rear middle-high region are surrounded by a linear squeezing groove.
<20> The absorbent article according to any one of <1> to <19>, wherein a pair of wing parts are provided on both outer sides in the width direction in the excretory part-facing region of the absorbent article.

<21> The absorbent article according to any one of <1> to <20>, wherein the side bulging portion is arranged in a region overlapping with the pair of wing portions in the longitudinal direction.
<22> The absorbent article according to any one of <1> to <21>, wherein the absorbent article has a rear flap portion at a rear portion in the width direction of the rear portion.
The absorbent article as described in any one of said <1>-<22> provided with the solid guard which can stand toward a wearer side in the both right and left sides along the front-back direction of a <23> absorbent article.
<24> The three-dimensional guard is configured to be able to stand at the excretory part-facing portion, and at the rear part, the three-dimensional guard forming sheet is provided with a portion that is difficult to stand up by being fixed to the surface sheet. 23>.
<25> The absorbent article according to any one of <23> or <24>, wherein the rear middle-high region is disposed in a region overlapping the portion of the solid guard that is difficult to stand in the front-rear direction.
<26> The absorbent article according to any one of <1> to <25>, wherein the absorbent article is a sanitary napkin having a total length of 30 cm or more.

1 Sanitary napkin (absorbent article)
2 Skin side sheet 2a Top sheet 2b Solid guard forming sheet 3 Non-skin side sheet 4 Absorbent core 41 Front middle / high area 44, 46 Groove part 45 Small absorbent part 42 Rear middle / high area 47 Groove part 48 Small absorbent part 43 Peripheral area 49 Side Swelling portion 53 Middle region 59 Continuous layer 6 Absorbent body 64 Intermediate lateral groove 7 Wing portion 8 Back flap portion 10 Solid guard 11 Front raised portion 12 Back raised portion A Front portion B Liquid excretion portion facing portion C Back portion

Claims (9)

Absorbent article comprising an absorbent core having a shape that is long in the front-rear direction of the absorbent article, and having an excretory part facing part disposed opposite the wearer's liquid excretion part and a rear part disposed behind the excretion part facing part Because
The absorbent core has a front middle and high area at the center in the width direction of the excretory part facing part, and has a rear middle and high area at the center in the width direction at the rear part,
The front middle-high region and the rear middle-high region are each thicker than the thickness in the peripheral region of the absorbent core, and are each divided by a groove extending in the width direction of the absorbent core, and the longitudinal direction of the absorbent core A plurality of small absorption parts arranged along the line are formed,
The absorptive article in which the length in the longitudinal direction of the small absorption part in the back middle high region is shorter than the length in the longitudinal direction of the small absorption part in the front middle high region.   The absorbent core includes a continuous layer that is not divided by any of the groove portion of the front middle-high region, the groove portion of the rear middle-high region, and an intermediate region between the front middle-high region and the rear middle-high region in the longitudinal direction. The absorptive article according to claim 1 provided.   In each of the front middle high region and the rear middle high region, the basis weight of the absorbent core forming material in the groove is lower than the basis weight of the absorbent core forming material in the small absorbent portion. Item 3. An absorbent article according to item 1 or 2.   The absorptive article according to any one of claims 1 to 3 whose average of the area of said small absorption part in said back middle high region is smaller than the average of the area of said small absorption part in said front middle high region.   Between the front middle-high region and the rear middle-high region in the longitudinal direction of the absorbent core, the length in the longitudinal direction of the absorbent core is larger than the groove portion of the front middle-high region and the groove portion of the rear middle-high region, respectively. The absorbent article according to any one of claims 1 to 4, wherein an intermediate region that is longer than the length in the longitudinal direction and has a thickness that is equivalent to a thickness in a peripheral region of the absorbent core is formed.   The absorbent article according to claim 5, wherein a bending guide portion extending in a width direction of the absorbent core is formed in the intermediate region.   A groove extending in the longitudinal direction of the absorbent core is formed in the front middle and high region, and the small absorbent portion in the front middle and high region is divided in the width direction of the absorbent core by the groove. Item 7. The absorbent article according to any one of Items 1 to 6.   The absorbent article according to any one of claims 1 to 7, wherein a groove portion extending in a longitudinal direction of the absorbent core is not formed in the rear middle-high region.   The absorptivity according to any one of claims 1 to 8, wherein a side bulging portion that bulges outward in the width direction of the absorbent core is formed on both sides of the front middle-high region. Goods.

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