JP2010273810A - Absorber and absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorber having excellent compatibility with a human body to appropriately fit the shape of the human body as the whole absorber is flexibly deformed and excellent motion following capability to excellently follow the deformation caused by motions, and capable of achieving high capability of absorbing and retaining a liquid, etc. whether the absorber is deformed or not deformed; and an absorbent article using the same. <P>SOLUTION: A plurality of absorbing parts are separately joined to a base sheet of the absorber via fixing parts. The fixing parts are included in the area of the absorbing parts as seen from the top, and an absorbent material is disposed between the absorbing parts. The basis weight of the absorbent material disposed between the absorbing parts is lower than the basis weight of the absorbing parts. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an absorbent body used for absorbent articles such as sanitary napkins, disposable diapers, and incontinence pants, and absorbent articles using the same.

  Absorbent articles used for sanitary napkins, disposable diapers, etc. usually absorb liquid between a liquid-permeable top sheet located on the skin side and a liquid-impermeable back sheet located on the clothes side. It has an absorbent body to hold. This absorber is generally rectangular in shape so as to cover the excretion point of the wearer, but an improvement in shape and structure has been proposed.

  For example, in Patent Document 1, in an unfolded diaper, an entire surface of one side of an absorbent body that covers the entire excretory region in front and back from the butt to the lower abdomen is fixed to an outer sheet, and is cut out in the middle of the absorbent body. A plurality of thin-walled portions are arranged in parallel. In this diaper, a string-like elastic member is disposed so as to be orthogonal to the parallel direction of the cut-out thin portion of the absorber, and when worn, the cut-out thin portion is deformed so that the cut-out thin portion opens and closes. However, some stretchability and bendability are imparted. However, this absorber does not consist of a plurality of independent absorbers. Since the entirety of the large absorbent body is fixed to the seat, it is not substantially different from the normal one in that respect, and it is not possible to expect a great improvement in the body compatibility and the movement followability with respect to the body movement.

  Patent Document 2 discloses an absorbent pad in which a liquid-impermeable back sheet and a liquid-permeable cover sheet are joined with a rhombus-based lattice-like (industrial lattice-like) line. Each of the rhombus regions surrounded by the joining line is disposed in a state in which a main body portion of the absorbent material is enclosed. Thereby, it is said that the orthogonal lattice-like joining line in which the absorbent material does not exist becomes a water channel, and the liquid can flow there. However, the main body portion of the absorbent material is fixed to the liquid-impermeable back sheet over the entire surface, and it is difficult to expect a significant improvement in body compatibility and motion tracking. In addition, the lattice-shaped joining line forming the water channel may be an obstacle to the liquid transfer between the liquid residue and the lattice-shaped region, depending on the application and the state of excrement.

  In what is described in Patent Document 3, a plurality of rectangular flat-plate-shaped absorbers are arranged in parallel on the stretchable sheet with the longitudinal direction thereof in the same direction, and one long side of each absorber is bonded to the stretchable sheet. It is fixed. The respective absorbers are arranged so as to overlap each other in the width direction, and at this time, even when the stretchable sheet is extended, the absorbers are continuously provided with a sufficient overlap amount so as to maintain the overlapping state of the absorbers. Since each flat absorbent body is fixed to the stretchable sheet only on one long side, the stretchability in the direction orthogonal to the long side is ensured rather than fixing the integral absorbent body covering the entire area to the entire surface. However, the stretchability in the long side direction is not improved and is not different from the conventional one. The same is true for bendability and it cannot cope with complex deformation.

  Patent Document 4 discloses an absorbent product configured using a composite sheet composed of a laminate of a nonwoven fabric layer and a fiber web layer as a top sheet, and combined with an absorbent body. For example, the composite sheet is a grid-like belt-like region having a high density and a thin thickness in a plan view, and a rectangular region partitioned by the lattice-like region, and has a low density and a low thickness. And a thick second network region. The first network region is formed as a region having a higher density than the second network region by pressing a bulky fiber web with the nonwoven fabric layer in the region. That is, the nonwoven fabric fibers are crushed in the first network region. However, in this composite sheet, the fiber web is disposed on the entire surface of the nonwoven fabric layer, and the basis weight does not change and is not divided as a whole. Therefore, the composite sheet has excellent stretchability, adaptability to the body and followability. The conversion is very limited.

Japanese Patent No. 3558801 Japanese Patent No. 2703596 Japanese Patent No. 4173656 Japanese Patent Application Laid-Open No. 2003-103677

  The present invention maintains human body compatibility that deforms according to a complex undulating skin surface and abuts on the surface without a gap, and deforms according to the movement of the wearer's body and abuts on the skin surface. The present invention relates to the provision of an absorbent body that has very good operation followability and realizes a high absorption retention of liquid or the like regardless of the presence or absence of deformation, and an absorbent article using the same.

  According to the present invention, the plurality of absorbing portions are separated from each other and joined to the base sheet via the fixing portion, and the fixing portion is included in the area of the absorbing portion in a plan view, and between the absorbing portions. An absorbent body is provided in which the basis weight of the absorbent material disposed between the absorbent portions is lower than that of the absorbent portion.

  The absorbent body and absorbent article of the present invention are deformed according to a complexly undulating skin surface and contact with the surface without a gap, and deformed according to the movement of the wearer's body, The operation followability for maintaining the contacted state is very good, and high absorption retention of liquid or the like is realized regardless of the presence or absence of deformation.

It is the perspective view which notched a part of absorbent article (sanitary napkin) using the absorber which concerns on one Embodiment of this invention. It is sectional drawing along the II-II line of FIG. It is the top view which showed the state when it was made to extend | stretch and the state of the natural length of the absorber test body produced in the Example.

Hereinafter, the present invention will be described in detail based on preferred embodiments with reference to the drawings.
FIG. 1 is a partially cut perspective view of an absorbent article (sanitary napkin) 100 using an absorbent body according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line II-II in FIG. . The absorbent body 10 of the present embodiment is arranged in the vertical and horizontal directions so that a large number of independent absorbent parts 3 have predetermined gaps d and e in the natural state on the surface (upper surface) of the non-stretchable base sheet 2. It is installed. The absorbing portion 3 has a rectangular shape in a plan view, and has a truncated trapezoidal shape (a truncated pyramid) with a horizontally long trapezoidal cross section and a slightly rounded surface. Is not particularly limited, and any shape can be adopted. In this embodiment, the absorption part 3 is comprised from the pulp fiber and the superabsorbent polymer, The outline may not be a fixed shape like what was illustrated, and it shall be the thing of the solid shape mentioned above as a whole. It is preferable.

First, a feature to be emphasized in the present embodiment is that a space Q having a base sheet as a bottom surface in a plan view is formed between the absorbing portions 3, 3, 3. The absorbent material 6 is arranged so that the basis weight is lower than that. By configuring the absorbent portion 3 and the absorbent material 6 laid in the space Q with such a basis weight distribution, the absorption rate in the thickness direction is improved and the diffusibility of the liquid flowing through the space portion is improved. In addition, the effect of spreading the liquid is improved compared to the case where there is no absorbent material in the space even when the absorbing portion 3 does not communicate due to operation or deformation of the absorber. In this case, the absorbent material 6 is preferably the same component as the pulp fiber or superabsorbent polymer constituting the absorbent part 3, but is not necessarily limited thereto, and has a composition different from that of the constituent material of the absorbent part 3. An absorbent material may be placed. In the present embodiment, the absorbent material 6 is composed of pulp fibers 6a and superabsorbent polymer beads 6b. By way of example, the basis weight of the absorbent part 3 and 20~800g / cm ^2, and more preferably set to 100 to 600 / cm ^2. Moreover, it is preferable that the basic weight of the absorptive material 6 of the space Q part between the absorption parts 3 shall be 2-500 g / cm < ² >, and it is 5-300 g / cm < ² > by the point of optimization of said property. More preferred. Further, the basis weight ratio between them (percentage of the value obtained by dividing the basis weight of the absorbent material 6 in the space Q by the basis weight of the absorbent portion 3) is preferably 50% or less, and more preferably 30% or less, Moreover, it is especially preferable to set it as 10% or less.

  In the present embodiment, the hydrophilicity of the entire absorbent body is increased by laying the absorbent material 6 such as a small amount of pulp or SAP in the space Q as described above. For this reason, the liquid uptake speed from the surface material is increased. In addition, when there is a small amount of an absorbent material 6 such as pulp or SAP in the space, the liquid easily spreads through the space. That is, even if it is not connected, the diffusibility of the liquid can be secured to some extent, so that the base absorption performance is improved. Furthermore, the liquid diffusion is further improved by the communication.

  The absorber 3 is trapezoidal in cross section, and the area of the front surface 3a is slightly smaller than the area of the back surface 3b. The side surface 3c is inclined toward the back surface so as to be widened toward the end in the cross section. Each absorbent portion 3 is a part of the back surface, not the entire surface, specifically, only the central portion t of the back surface 3b is fixed to the base sheet 2 so that the region of the absorbent portion includes the fixed portion region in plan view. Yes. The fixing part 4 does not exhibit elasticity. In other words, the projection image of the fixing unit 4 is included in the projection image of the absorption unit 3 when the projection images of the absorption unit 3 and the fixing unit 4 are projected in the thickness direction of the absorber. The fixing portion 4 can be formed by, for example, ultrasonic embossing or hot melt, whereby the absorbing portion 3 is fixed at this portion, and even if a stretchable material is used for the base sheet 2, Its elasticity is lost. Moreover, you may form the fixing | fixed part 4 with a hot-melt-adhesive material etc. At this time, in order to more firmly and surely join the absorbing portion 3 and the base sheet 2 in the fixing portion 4, the skin portion side surface 3a of the absorbing portion 3 may be pressed with a pin. A depression 3k is formed at the center of the absorbing portion of the present embodiment by pressing the pin (see FIG. 1). In addition, the lower curve 3b of the absorbing portion 3 is not bonded to the base sheet outside the fixing portion 4, and the base sheet 2 is maintained in the flexibility or stretchability in the outer region S thereof.

Thus, by fixing the absorption part 3 only by the base sheet 2 and the fixing part 4, the gaps d and e between the absorption parts 3 are bent, while each of the absorption parts 3 on the base sheet 2 is separated from the base sheet 2. Is almost unaffected, and hardly changes in shape. And conversely, the deformability by which the base sheet 2 as the whole absorbent body is bent is ensured. Specifically, for example, when the sanitary napkin 100 shown in FIG. 1 is worn, the distances d and e approach each other so as to bend or contract, and the intervals d and e become narrower or wider. In this way, the absorbers 3, 3, 3... Maintain the cooperation related to the transmission of the liquids and the like while the absorber 10 is deformed as a whole, and exhibit good absorption retention of the liquids and the like. At this time, especially in this embodiment, the absorptive material 6 is laid between the absorbing portions 3, 3, 3,. For this reason, the hydrophilic property as the whole absorber improves, and the uptake | capture speed of the liquid from a surface material becomes quick. Furthermore, due to the presence of the absorbent material 6 between the absorbent parts 3, the liquid transmission between the absorbent parts 3 is more reliably realized, and when the entire absorbent body 10 is subjected to deformation such as expansion and contraction, Even when there is no deformation and the absorbing parts are separated via the spaces c and d (space Q), the function of transmitting liquid or the like is provided.
In particular, since the absorbent body 10 of the present embodiment is composed of a set of a large number of independent small absorbent parts, “body compatibility” that fits the undulations on the skin surface is greatly enhanced as compared with the conventional one. In addition, “movement following” is very good because it follows the movement of the wearer well and prevents a partial gap from occurring on the skin. According to the present embodiment, it is possible to achieve both such good deformability and good absorption and retention of liquid and the like that are not affected by the deformation.

Furthermore, in the present embodiment, a large number of small absorbent parts fractionated as described above are arranged on the base sheet in a specific arrangement, and the absorbent material 6 in the space Q does not substantially restrain its movement, It is also suitable for complexly bent skin surfaces. For example, when a sanitary napkin is stretched from the excretion point to the buttocks, it bends in the longitudinal direction along the roundness of the buttocks, but the included conventional absorbent body is generally much higher in rigidity than other members. You may buckle. In relation to this buckling deformation, the internal absorber is difficult to enter the crack, and a large gap may open here. That is, it is difficult to achieve both the buckling in the longitudinal direction and the bending in the width direction, and it is difficult to obtain a sufficient fit. Then, menstrual blood or the like easily migrates through the space that has been ruptured, which may cause leakage in the back direction at bedtime.
On the other hand, if it is a sanitary napkin to which the absorbent body of the present embodiment is applied, a so-called saddle shape or hyperbolic parabola surface that gently curves and fits in the roundness of the buttocks while appropriately entering the crack. It deforms into a shape and fits almost without leaving a gap in the cleft. Thereby, the very favorable compatibility which contact | abuts almost without a gap from the excretion point vicinity to a buttocks is implement | achieved. And even when the wearer turns over or walks, it follows the movement of the skin surface, so that the gap is not opened and good fit is maintained.
In addition, since the sanitary napkin of the present embodiment has a very high shape restoring property, for example, even when folded into three folds at the time of individual wrapping, the folds are not likely to remain, and the above-mentioned good body suitability from the beginning of wearing And followability.

In the absorbent body 10 of the present embodiment, the absorbing portions 3 are arranged in a staggered arrangement. In the present invention, the staggered arrangement means an arrangement in which the pitches of the absorbing portions in adjacent rows are shifted when a plurality of absorbing portion rows are arranged in parallel. In other words, this arrangement is an arrangement that does not coincide with the projected image of the adjacent absorber 3 when the absorber 3 in a predetermined row is projected in the orthogonal direction. This specific example will be described with reference to FIG. 3A. Absorber rows A juxtaposed to the absorber row B extending in the longitudinal direction (X direction) are adjacent to each other, and this is repeated alternately. Assume an auxiliary line t _b continuing in the direction (Y direction) perpendicular to the direction of extension of the central absorbent portion row B in the plan view of the absorber column B. On the other hand, assume the same auxiliary line t _a in the absorption unit column A. Such auxiliary lines t _a and the auxiliary line t _b is shifted by a half pitch from each other, i.e. distance between the auxiliary line t _a and the auxiliary line t _b constitutes a sequence has been staggered to equal throughout. As a modified example of the present embodiment, for example, the absorption row portion A and the absorption portion row B are set in the width direction (Y direction) of the absorber by rotating the direction by 90 ° without shifting the pitch, and the longitudinal direction (X direction). Embodiment which gives a shift | offset | difference to the auxiliary line extended in this is mentioned. In addition, when the staggered arrangement is viewed as a masonry, it can be said to be a fabric, and examples of this variation include a twill weave, a yaba product, and a turtle shell product.

If the magnitude | size of the absorption part 3 by this embodiment is illustrated, for example, when considering the utilization in a sanitary napkin, the width T (refer FIG. 3) is preferably 1-50 mm, although it varies somewhat depending on the absorbent article to be incorporated. 30 mm is more preferable. The vertical width S is preferably 3 to 100 mm, and more preferably 5 to 80 mm. The pitch P2 is preferably ₂ to 60 mm. The gaps d and e (see FIG. 1) are preferably 0.1 to 30 mm and 0.1 to 30 mm, respectively.

  In the sanitary napkin 100 according to the present embodiment (see FIGS. 1 and 2), the absorbent body 10 in which the plurality of absorbent portions 3 are disposed on the base sheet 2 as described above is disposed on the back sheet 7, for example in a spiral shape. Joined by the applied hot melt adhesive. The side sheets 8 are fixed to both sides of the back sheet 7 in the longitudinal direction by hot melt or heat sealing on the outside thereof, and the top sheet 1 is sandwiched and fixed on the inside thereof. At this time, the peripheral edge g of the napkin is fixed to the extent that the stretchability is not hindered as a whole and the liquid once absorbed does not leak. A topsheet 1 is disposed on the absorber 10 so as to cover almost the entire surface, and a groove 11 is formed by embossing a cloud pattern in a plan view from the topsheet 1 to the absorber 10 to absorb the topsheet 1. Deviation from the body 10 is suppressed (the groove 11 is not shown in FIG. 2). Here, the top sheet 1 side is the side in contact with the skin, and the back sheet 7 side is the side in contact with the underwear.

  Although there is no restriction | limiting in particular as a constituent material of the absorption part 3, A fiber material, a porous body, those combinations, etc. can be used. Examples of fiber materials include natural fibers such as wood pulp, cotton and hemp, semi-synthetic fibers such as acetate, rayon, tencel and lyocell, polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate, and polyvinyl alcohol. When a single fiber made of a synthetic resin such as a resin, a composite fiber containing two or more of these resins, or a fiber made of a synthetic resin is used, the fiber may be a heat-shrinkable fiber whose shape changes with heat. For example, the fineness is increased by heat, but the fiber length is shortened, and the fineness is hardly changed by heat, but the length occupied by the apparent fiber is shortened by changing the shape to a coil shape. May be. As the porous body, sponge, non-woven fabric, aggregate of superabsorbent polymer (aggregate of superabsorbent polymer and fiber) and the like can be used.

  As the superabsorbent polymer contained in the absorbent part 3, a polymer that can absorb and retain a body fluid more than 5 times its own weight and can be gelled is preferable. The shape is not particularly limited and may be spherical, massive, grape-like, powdery or fibrous. The particle size is preferably 1 to 1000 μm, more preferably 10 to 500 μm. Examples of such superabsorbent polymers include polyacrylic acid and salts thereof, and polyacrylate graft polymers such as starch, crosslinked carboxylmethylated cellulose, polymers or copolymers of acrylic acid or alkali metal acrylates. Coalescence can be mentioned. As the polyacrylic acid salt, a sodium salt can be preferably used. In addition, a comonomer such as maleic acid, itaconic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, 2- (meth) acryloylethanesulfonic acid, 2-hydroxyethyl (meth) acrylate or styrenesulfonic acid is added to acrylic acid. A copolymer copolymerized within a range not deteriorating the performance of the superabsorbent polymer can also be preferably used.

  When the superabsorbent polymer is contained in the absorbent part 3, the proportion of the superabsorbent polymer in the weight of the absorbent part 3 is preferably 5 to 95% by weight. When the absorbent body 10 is used as an absorbent body for a sanitary napkin or an article used to absorb a liquid with a low excretion such as light incontinence, the proportion of the superabsorbent polymer in the weight of the absorbent portion 3 is 10 to 10. 30% by weight is preferred. When the absorbent body 10 is used as an absorbent body of an article used for absorbing a high excretion amount liquid such as a disposable diaper, the ratio of the superabsorbent polymer to the weight of the absorbent portion 3 is 50 to 80% by weight. It is preferable.

  Regardless of whether the absorbent portion 3 contains or does not contain a superabsorbent polymer, the stretchable absorbent body 10 has a retained amount of 0.9% by weight sodium chloride aqueous solution of 10 g / g or more, particularly 20 g / g or more. It is preferable from the point that even if the base sheet 2 expands and contracts, stable absorption performance is exhibited. In order to realize such a holding amount, as a constituent material of the absorption part 3, fibers having high hydrophilicity and high capillary force (for example, pulp, rayon, etc.) and not dull even when wet (not plasticized or wet) It is advantageous to use a combination of synthetic fibers (which do not decrease strength) and superabsorbent polymers.

  As the base sheet 2 to which the absorption part 3 is fixed, a sheet having a function of drawing and diffusing excreted liquid is used. As a sheet | seat which has such a function, the nonwoven fabric and film which contain the fiber which has hydrophilic property, or was processed with the hydrophilic oil etc., a porous body, etc. are mentioned, for example. These sheets may be in a single layer state or may have a multilayer structure in which a plurality of layers are laminated to form a single sheet.

As another embodiment of the present invention, it is preferable to apply a stretchable sheet as the base sheet, and the material thereof can be used without any particular limitation. As such a sheet, for example, a three-dimensional network is formed in the structure by means of a nonwoven fabric (elastic nonwoven fabric) containing fibers containing elastic resin as a constituent fiber, a film containing elastic resin (elastic film), or foaming. And an elastic porous body made of an elastic resin. As the elastic nonwoven fabric, the elastic film, and the elastic porous body, those known in the technical field can be used. The basis weight of the base sheet 2 is preferably 5 to 50 g / m ² , particularly preferably 10 to 30 g / m ² .

The degree of stretchability of the base sheet 2 is such that the stretchability measured by the following method is 60% or more, particularly 80% or more, and the suitability to the wearer's body shape and the operation followability are particularly good. It is preferable from the point. The expansion / contraction rate is measured by the following method. Measurement is performed in a tensile mode using a tensile compression tester RTC-1210A (Toyo Orientech Co., Ltd.). First, the base sheet 2 is cut into a width of 25 mm and a length of 150 mm, and a measurement piece is collected. Set the test piece between the air chucks attached to the tensile and compression tester with an initial sample length (distance between chucks) of 100 mm, and the chuck attached to the load cell (rated output 5 kg) of the tensile and compression tester at a speed of 300 mm / min. Raise the measurement piece. When the measurement piece extends 50% of the initial sample length, that is, 50 mm, the moving direction of the chuck is reversed, the chuck is lowered at a speed of 300 mm / min, and returned to the position of the initial sample length. During this operation, the relationship between the load detected by the load cell and the elongation of the measurement piece is recorded on a chart, and the expansion / contraction rate is obtained from the following formula (1) based on this chart.
Stretch rate = Recovery elongation / Maximum elongation length (= 50 mm) (1)
Here, the recovery elongation is defined as the chuck moving distance from the maximum extension length when the zero load is recorded for the first time when the chuck is lowered from the maximum extension length (= 50 mm). In addition, when a measurement piece is less than the above-mentioned size, it measures by the following method.
<Test specimen> When the length of the sheet in the chuck-to-chuck direction is Lmm, the length of the gripping part is Smm, and the width is Cmm, the test specimen (L + 2S) has a length ratio of L: C = 3: 5. ) Cut to a size of mm × Cmm and collect a measurement piece.
<Test> A test piece was set on a tensile / compression tester at a distance L between chucks, and the test piece was raised to 100 × (L / 30) mm / min until the measurement piece was extended by 50% of the initial sample length. Thereafter, the moving direction of the chuck is reversed, the chuck is lowered at a speed of 100 × (L / 30) mm / min, and returned to the initial sample length position. It calculates with the following formula (2).
Stretch rate = Recovery elongation / Maximum elongation length (= L / 2mm) (2)

  The top sheet is preferably made of a material that is liquid permeable and soft against the skin. For example, a non-woven fabric made of natural fibers such as cotton or a non-woven fabric made of various synthetic fibers subjected to hydrophilic treatment can be used. The back sheet is preferably made of a liquid-impermeable sheet material. The back sheet may be water vapor permeable as required. Specifically, in order to obtain sufficient water vapor permeability, a film made of synthetic resin such as polyethylene in which fine powder made of filler such as calcium carbonate is dispersed is stretched and a porous film having fine holes is used. Is preferred. Examples of the side sheet include a nonwoven fabric, a film sheet, and paper. From the viewpoint of leakage prevention, it is preferable that the side sheet is formed of a liquid non-permeable or hardly permeable hydrophobic nonwoven fabric, a leak-proof film sheet, or the like. One sheet may be used, or two or more sheets may be combined with a functional sheet.

  In the absorbent body of the present invention, Japanese Patent Application No. 2007-316239 and Japanese Patent Application No. 2007-332419 can be further referred to for the constitution or materials of the base sheet and the absorption part.

  Although the example applied to the sanitary napkin was shown in the above-mentioned embodiment, the absorbent body according to the present invention is not limited to such an absorbent article, but also for disposable diapers, infant or elderly diapers, and other incontinence pants. The same applies.

  As described above, according to the absorbent body according to the present invention, it is flexibly deformed into various human body shapes, fits well to the human body shape of the wearer, and does not feel uncomfortable when worn. Further, various effects are brought about, such as well following the deformation of the wearing part due to the operation, and the deterioration of the absorption performance due to the deformation does not occur.

  The present invention will be described in more detail below based on examples, but the present invention should not be construed as being limited thereby.

The absorbent body test body shown in FIG. 3A was prepared (the absorbent material 6 is omitted in FIG. 3). Using pulp / superabsorbent polymer mixture (200 / 50g / ^{m 2)} which is Fugata the truncated pyramid shape as illustrated as an absorption unit, using the width 200 mm, the longitudinal width 100mm nonwoven fabric as the base sheet . The size of the absorbing portion was set such that the horizontal width T = 6.5 mm, the vertical width S = 13 mm, the pitch P ₂ = 7.5 mm, the gap d = 1.5 mm, and e = 1.0 mm (the symbols for the dimensions are shown in FIG. 1). FIG. 3). The absorption part was fixed to the base sheet using ultrasonic embossing (radius 1.0 mm). An unmolded absorbent material made of the same material as that in the space was spread between the absorbent parts and laid between the absorbent parts. The ratio (basis weight ratio) between the basis weight of the absorbing portion and the basis weight of the absorbent material can be determined by the following procedure.
1. The basis weight of the entire absorbent body is measured (absorbing part (pyramidal frustum shape) + nonwoven fabric + absorbing material in the space between the absorbing parts).
2. In the state including the non-woven fabric, 10 absorbent parts are arbitrarily cut out in the shape of a truncated pyramid, the basis weight is measured, and the average value is obtained. Thereafter, the basis weight of the nonwoven fabric that has been measured in advance is subtracted to obtain the basis weight of the absorbent portion.
3. The basis weight of the absorbent material in the space between the absorbent parts is calculated by the basis weight of the absorbent material in the space between the absorbent parts = the total basis weight-the basis weight of the nonwoven fabric-the basis weight of the absorbent part.
4). The ratio (basis weight ratio) between the weight of the absorber and the weight of the absorbent material is:
{(Basis weight of the absorbent material in the space between the absorbent parts) / (basis weight of the absorbent part)} × 100 (%)
To calculate the ratio.

  In the above-mentioned absorbent body test body, a material using the SMS nonwoven fabric (manufactured by Unitika, trade name Elves) as the material constituting the base sheet (test body 1: Example 1), stretchable MB nonwoven fabric (resin: manufactured by Kuraray Co., Ltd.) A product (test body 2: Example 2) using a product name Septon made of non-woven fabric with an in-house melt blown device was prepared. In order to contrast with this, an absorbent body applied to a commercially available sanitary napkin was cut out in the same form as the above-mentioned test body (Comparative Example: Test body 3). Table 1 shows the results of measuring the bending stiffness according to the following procedure using the specimens of these examples and comparative examples.

<Measurement method of bending stiffness>
Kato Tech Co., Ltd. KES-FBS-L (trade name) was used as a measuring instrument. Measurement was performed with a maximum curvature of ± 0.5 cm ⁻¹ and a curvature deformation rate of 0.5 cm ⁻¹ / sec (constant), and the clamp width was 40 mm and the sample width was 25 mm. The measurement was performed under the conditions of a temperature of 20 ° C. and a humidity of 65%.

＊１ 吸収部の比率：平面視における吸収部の占有面積を吸収体全体の面積で除した値の百分率。
＊２ 坪量比：吸収部間（空間）に在る吸収素材の坪量を吸収部の坪量で除した値の百分率。

* 1 Absorber ratio: Percentage of the value obtained by dividing the area occupied by the absorber in plan view by the area of the entire absorber.
* 2 Basis weight ratio: Percentage of the value obtained by dividing the basis weight of the absorbent material between the absorbent parts (space) by the basis weight of the absorbent part.

  In the case of the absorber (comparative example) in the conventional product, high bending rigidity was shown in both the MD direction and the CD direction. On the other hand, in the absorber (Example 1, Example 2) which concerns on this invention, bending rigidity was reduced significantly in both MD direction and CD direction. Therefore, according to the absorbent body of the present invention, the absorbent body is deformed in good conformity with the movement of the human body, extremely high followability is exhibited, and it does not give a sense of incongruity even when various operations are performed. I understand.

  FIG. 3B is a schematic plan view of the state in which the absorbent body test body 2 is extended in the length direction. In this test example, the elongation ratio in the longitudinal direction was 30%, and the contraction ratio in the width direction was 14%. In both the unextended state (FIG. 3 (a)) and the extended state (FIG. 3 (b)), the transfer of liquid between adjacent absorbent parts 3 is effective in the vertical and horizontal directions between the absorbent parts as indicated by arrows f and h. It was confirmed that

DESCRIPTION OF SYMBOLS 1 Top sheet 2 Base sheet 3 Absorbing part 4 Fixing part 6 Absorbent material 6a Pulp fiber 6b Super absorbent polymer beads 7 Back sheet 8 Side sheet 10 Absorber 100 Absorbent article

Claims (6)

  The plurality of absorbent parts are separated from each other and joined to the base sheet via a fixed part, and the fixed part is included in the area of the absorbent part in a plan view, and an absorbent material is disposed between the absorbent parts. And an absorbent body having a basis weight lower than that of the absorbent portion.   The absorbent body according to claim 1, wherein the base sheet is a stretchable sheet and is in a non-stretchable state at the fixing portion.   The absorbent body according to claim 1, wherein the plurality of absorbing portions are arranged on one side of the base.   The absorbent body according to any one of claims 1 to 3, wherein the absorbent material is the same as a material constituting the absorbent portion.   The absorber according to any one of claims 1 to 4, wherein a space having the base sheet as a bottom surface is formed between the absorbing portions in a plan view, and the absorbent material is disposed in the space.   The absorbent article provided with the absorber of any one of Claims 1-5.

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