JP5102592B2 - Absorbent article and method for manufacturing the same - Google Patents

Description

  The present invention relates to an absorbent article having an absorbent body and a method for producing the same.

  Absorbent articles such as disposable diapers, sanitary napkins, urine collecting sheets and the like usually include an absorbent that absorbs and holds liquid. In such an absorbent article, for example, a method for shaping an absorbent material has been proposed in consideration of fitability to the wearer and the like (see Patent Documents 1 and 2). Specifically, it is a method in which fibers as a raw material are supplied in a scattered state, sucked and deposited in a concave portion for accumulation provided with suction holes, and a deposit of the raw material is released from the concave portion to form an absorber or the like.

  On the other hand, a sanitary napkin in which an emboss is provided in an absorbent body has been proposed in order to prompt diffusion of liquid and eliminate so-called stickiness (see Patent Documents 3 and 4). Alternatively, in consideration of the suppression of liquid edge leakage, only the central portion of the material sheet is thickened, and the whole is compressed to increase the fiber density in the central portion (see Patent Document 5). .

Japanese Patent Laid-Open No. 62-206071 JP 2000-234355 A JP 57-69856 A JP 61-191359 A Japanese translation of PCT publication No. 2002-517280

  An object of the present invention is to provide an absorbent article having an absorbent body that has high liquid holding power, suppresses liquid return, and has controlled liquid diffusibility inside. Furthermore, the present invention provides an absorbent article having an absorbent body in which the density and thickness of the absorbent body are desired, and where the absorbent body has a uniform thickness between the high density part and the low basis weight part and the low part as necessary. With the goal. Furthermore, it aims at provision of the manufacturing method of the absorbent article which can carry out the three-dimensional shaping | molding of the absorber which has said outstanding function efficiently.

The above object is an absorbent article including an absorbent body, in which the absorbent body has a high density and a high basis weight area, a medium density and a medium basis weight area in the width direction , toward both sides from the center. An absorbent article which is divided into low density and low basis weight regions, and in which the density and basis weight become lower in this order, and has a recess in the high density and high basis weight region .
In addition, as a preferable manufacturing method of the absorbent article, by compressing a body precursor having a predetermined portion having a higher basis weight than other portions, in the width direction of the absorbent body, toward the both sides from the central portion, Absorber that is divided into a high-density, high-basis weight region, a medium-density, medium-basis-weight region, and a low-density, low-basis-weight region. In forming the high-basis-weight region, the embossing is provided on the portion having the high basis weight of the precursor, and at the same time, at least the portion having the high basis weight is compressed to form the high-density high-basis-weight region having the recesses by the embossing. The manufacturing method of the absorbent article formed and arrange | positioning the said absorber is provided.

  The absorbent article of the present invention has an excellent effect that the absorbent body has a high liquid holding power, suppresses liquid return, and controls the liquid diffusibility inside to prevent leakage. Furthermore, the absorbent article of the present invention can have the desired density and thickness of the absorber, and if necessary, the portions having high absorber density and basis weight and these low portions can be made to have a uniform thickness. Thus, while maintaining the above-mentioned excellent functions, it is possible to prevent the loss of shape and achieve a good fit. Furthermore, according to the production method of the present invention, the absorbent body having the above-described excellent function can be efficiently and accurately molded, and high-speed mass production of an absorbent article having a stable quality absorbent body. It can respond suitably.

Hereinafter, the present invention will be described in detail.
FIG. 1 is a plan view schematically showing a sanitary napkin as one embodiment (this embodiment 1) of an absorbent article produced by the method for manufacturing an absorbent article of the present invention. 2 is a cross-sectional view showing a cross section taken along line II-II in FIG.

  The sanitary napkin 10 of the present embodiment includes a top sheet 2, an absorbent body 1, and a back sheet 3 (see FIGS. 1 and 2). A liquid-permeable material is usually used for the top sheet 2, and a liquid-absorbing and retaining material is used for the absorber 1. Then, the excreted menstrual fluid or the like passes through the top sheet 2 and is absorbed by the internal absorber 1. The back sheet 3 is usually made of a liquid-impermeable material, so that the absorbed liquid can be cleanly absorbed and retained without being leaked to the wearer's clothing. Furthermore, the sanitary napkin 10 of the present embodiment is provided with side wings that protrude from both sides. And the surface sheet 2 and the back surface sheet 3 are joined by the side seal 9 (FIG. 2), and it is comprised so that the absorber 1 may be hold | maintained inside. At this time, the absorber 1 may or may not be fixed to the top sheet 2 and the back sheet 3, but is preferably fixed so that the absorber 1 does not shift during use.

In the sanitary napkin 10 of the present embodiment, the absorbent body 1 has a plate shape or a sheet shape. A high density and high basis weight region 1a in which the density and the basis weight of the substantially central portion in the surface direction of the absorber (the surface direction indicated by the direction X and the direction Y in FIG. 1) is increased is provided around the periphery. A low density low basis weight region 1b having a lower density and basis weight than the high density high basis weight region 1a is provided. In the present invention, the density of the absorbent means a fiber density (a mass of fibers per unit volume) in a predetermined region of the absorbent unless otherwise specified. However, when the predetermined region includes a portion where the fiber is melted and solidified (for example, formed into a film) by embossing (recessed portion) 5 or heat embossing described later, the basis weight of the region is divided by the total thickness of the region. It means density.
The thickness of the absorber can be measured as follows.
First, a plate having a pressing force of 0.5 cN / cm 2 or less is placed on a measurement table, and its height A is measured with a laser displacement meter. Next, the absorber is placed on a measurement table, and the above plate is further placed thereon to measure the height B of the upper surface of the plate. B-A at this time is defined as the thickness of the absorber. In the present invention, unless otherwise specified, the thickness of the absorber refers to the thickness measured on the above plate, but in the case where it is difficult to measure by placing the plate, the cross section is observed with a microscope, Thickness can be measured.
At this time, the region 1a in which the density of the absorber is increased has a higher capillary force than the peripheral region, which is the region 1b, and the liquid tends to stay in the region 1a. Thus, by setting the central portion to a high density and the periphery thereof to a low density, for example, the liquid absorbed at the center can be prevented from diffusing and spreading to the periphery. Even when liquid excretion is concentrated in the center of the article in the sanitary napkin, the high density and high basis weight region 1a is arranged in the center as in the present embodiment, which is preferable because the leakage prevention property of the absorbent article is increased. .

  The shape, size, and number of the high density and high basis weight regions 1a are not particularly limited. For example, when one high density and high basis weight region is provided at the center of the absorber, the region 1a has a width w1 of the absorber. It is preferable to set the ratio (w2 / w1) of the width w2 to about 1/4 to 2/3 (see FIG. 1). Moreover, it is preferable that the ratio (l2 / l1) of the length l2 of the region 1a to the length L1 of the absorber is about 1/3 to 1/1. The length of the absorbent body is usually the length of this type of article, and in the case of sanitary napkins, it is about 100 to 450 mm.

  In the sanitary napkin 10 of the present embodiment, the embossing (concave portion) 5 is provided in the high density and high basis weight region 1 a of the absorbent body 1. Thus, by providing the embossing (concave part) in the high density and high basis weight part of the absorber, the part where the density of the absorber is further increased in the high density and high basis weight region 1a at the lower part of the embossing (concave part). A (recessed lower portion) 6 is formed. And the capillary force in this further increased density portion (lower recessed portion) 6 is remarkably increased (FIG. 1 shows the portion 6 in which the density is further increased in only one place, but the embossed (recessed portion) ) The density of the absorber is further increased in each of the lower portions of 5. This also applies to other embodiments described later. In addition, the embossing (recessed part) 5 may be provided on the back surface of the absorbent body. In this case, a portion 6 having a higher density is disposed on the upper side of the embossed (recessed part) 5. As a result, in the region where the emboss is provided, the liquid can be easily guided to the emboss, and the liquid can be prevented from proceeding directly to the low density portion in the periphery, thereby suppressing spreading and spreading to the surroundings. In addition, by providing a plurality of embosses close to each other at a predetermined shape and interval, the high density and high basis weight region 1a can be stabilized, and in this region, there is an effect of suppressing liquid diffusion by embossing.

  Here, regarding the entire absorbent body 1, as described above, the high density and high basis weight region 1 a is arranged at the center, and the density is formed in the surface direction of the absorbent body. Thereby, as described above, the liquid is kept at the center by the capillary force, and the liquid diffusion to the peripheral portion is suppressed. Furthermore, by arranging the emboss 5 formed with a higher density locally in the high density and high basis weight region 1a in a predetermined form, the diffusion suppressing force is further enhanced by the liquid conductivity to the emboss 5. That is, it is possible to realize a liquid return suppression property and a liquid diffusion control property due to the interaction between the two, which cannot be simply provided with embossing or simply provided with a density gradient. The embossed surface may be one or both of the front surface and the back surface of the absorber.

  The above interaction will be described more specifically below. First, regarding the action of the high density and high basis weight region 1a, the high density and high basis weight region 1a at the center of the absorbent body in this embodiment has a higher basis weight and density than the peripheral region 1b, and the capillary force between the fibers is higher. Pull liquid strongly. Since the liquid moves from the low density area to the high density area, it is difficult to spread from the high density area to the low density area. For this reason, for example, by providing a high density and high basis weight region in the central portion, the liquid retention is excellent, and the leakage suppressing power is exhibited. Furthermore, by arranging the high density and high basis weight region 1a of the absorber long in the front-rear direction (Y direction) as in the present embodiment, it is possible to form the absorber front and rear end portions that are usually difficult to use as the liquid absorption region. The liquid can be spread and held up to. In this way, it is possible to increase the amount of liquid retained in the entire absorbent body, while achieving the effect of improving leakage prevention.

By the way, when the density of the absorber is increased, the liquid holding force and moving speed, that is, the diffusion speed are increased, but the absorption rate of the liquid per volume is remarkably reduced, so that the absorption speed is decreased. Therefore, even if the density of the high-density portion is increased simply to increase the density, the absorption speed is slowed down, resulting in the spread of liquid that cannot be absorbed in time. In other words, the liquid absorption rate and the diffusion rate are usually contradictory, and it is difficult to achieve both of them by adjusting the density of the absorber. For this reason, it is difficult to achieve both the above-described side leakage prevention action and the front-rear direction diffusion holding action at a high level.
On the other hand, in this embodiment, the liquid diffusion directionality can be given by combining the action of the high density and high basis weight region and the action of the concave portion (emboss) formed by locally increasing the density. Therefore, it is possible to exhibit a side leakage preventing action and a front-rear diffusion holding action, and to realize a large absorption amount. Furthermore, since the liquid is quickly diffused by the recess, the diffusion rate can be improved. This function is preferable because the surface side (wearer side) has a recess because it works directly on the absorbed liquid. However, even on the non-absorptive surface side (opposite to the wearer), this function passes. The same effect is achieved with the overflowing liquid.

  Specifically, the density of the absorber in the embossed portion is extremely high, and by providing a large number of these intermittently, it is possible to arrange portions having extremely high diffusing power in the region, and relatively high other than the embossed portion. Quick liquid absorption in the density area. Then, by appropriately adjusting the shape and interval of the emboss, the liquid can be selectively transmitted along the emboss row and diffused in a desired direction. Thereby, it is possible to increase both the liquid diffusion holding amount of the high density and high basis weight region 1a and the liquid absorption speed in a predetermined direction. Further, the embossing pattern has a form in which the liquid moves in the front-rear direction (Y direction) of the absorber, and a form in which the liquid does not easily diffuse in the width direction (X direction). The diffusion holding action can be enhanced at the same time. Examples of such a functional emboss pattern include a pattern in the longitudinal direction which will be described later.

  In this way, the distribution of the area density of the absorber (area ratio, arrangement, etc. of the high density high basis weight area 1a and the low density low basis weight area 1b) and the embossing arrangement (the depth of the embossing, By combining the shape, number, interval, size, etc.) in various ways, it is possible to configure a functional absorbent body according to the required use situation, the amount and properties of excretory fluids.

Furthermore, by providing the embossing 5 in the high density and high basis weight region 1a, the shape stability of the absorbent body (particularly, the high density region 1a) can be improved, and the absorbent body can have a desired shape. For example, as will be described later, the absorber precursors that are partially different in thickness are compressed by a press provided with a plurality of blades, and the above-described high-density high basis weight region 1a is provided with an emboss. can do.
At this time, as in the above-mentioned Patent Document 5, if the sheet material having a partially different thickness is simply compression-formed by a flat press, the compressed and denser portion becomes particularly too thin, Conversely, it may become too thick. This shape change may occur immediately after compression or may gradually change over time. Even when it is difficult to obtain a desired shape in this way, variation in the shape can be suppressed by compressing the entire absorbent body very strongly. However, in this case, the whole is compressed too much, and as described above, a good liquid absorption / diffusion rate may not be obtained. Or an absorber may become hard too much.

According to the first embodiment, the instability of the shape as described above can be eliminated by the combined action of the high density and high basis weight area 1a and the embossing 5, for example, the high density and high basis weight area 1a and the low density and low density. The basis weight region 1b can be made to have substantially the same thickness, and the shape thereof can hardly change over time . In the present invention, the substantially same thickness means that the thickness is uniform throughout the absorbent body, but there is a variation in thickness within a range that does not functionally affect the fit and liquid absorbency of the article. There may be. Specifically, the partial thickness difference of the absorber is preferably within 2 mm.

  Thus, by making the absorbent body into a desired stable shape, the absorbent article can be prevented from being deformed, and in particular, the morphological interaction between the absorbent body and other members can be maintained. Specifically, the adhesiveness is good, and a smooth transfer of liquid or the like from the top sheet to the absorber is possible. Moreover, since uniform thickness is maintained like the absorber of this embodiment, it can wear without discomfort.

The depth of the recess (embossed) provided in the absorber is not particularly limited, it is practical to 20 to 80% of the depth of the absorber thickness t _{1 (FIG.} 2). Although thickness t1 of the absorber ₁ is not specifically limited, For example, it is preferable to set it as 2-8 mm in the sanitary napkin.

  In the sanitary napkin 10 of the first embodiment, the embossing 5 is disposed only in the central high-density high basis weight region 1a, but the embossing 5 may be provided in combination with the low-density low basis weight region 1b. Good. For example, the embossing pattern which provided the function which suppresses the spreading | diffusion of the liquid to the width direction in the area | region 1b can be provided, and this can further improve a side leak prevention property.

In the first embodiment, the absorbent body 1 is provided with the high density and high basis weight region 1a as described above, and the density is not particularly limited. However, considering that it is a sanitary napkin, for example, 0.02 to 0 0.2 g / cm ³ is preferable, and 0.04 to 0.16 g / cm ³ is more preferable. On the other hand, the density of the low density low basis weight region 1b is preferably 0.01 to 0.1 g / cm ³ , for example, and more preferably 0.02 to 0.08 g / cm ³ . The difference in density between the high density high basis weight region 1a and the low density low basis weight region 1b is preferably 0.01 to 0.1 g / cm ³ , for example, 0.02 to 0.08 g / cm ³ . It is more preferable.

In this Embodiment 1, the basic weight of the high density high basic weight area | region 1a of the absorber 1 shall be higher than the basic weight of the low density low basic weight area | region 1b. Although the specific basis weight of the high-density area | region 1a is not specifically limited, Considering using it as a sanitary napkin, it is preferable to set it as 200-800 g / m < ² >, for example, and it is more preferable to set it as 250-450 g / m < ² >. . The basis weight of the low density and low basis weight regions. 1b, for example, preferably to 100 to 400 g / ^{m 2,} and more preferably set to 150 to 250 g / ^{m 2.} It is preferred that the difference in basis weight, for example 100 to 400 g / ^{m 2} of high density high basis weight region 1a and the low density and low basis weight region 1b, and more preferably set to 150 to 250 g / ^{m 2.}

  Usually, if the density of the absorber is simply increased, the amount of liquid absorbed by the absorber is reduced accordingly. On the other hand, in the absorbent article of the first embodiment, since the basis weight is increased in combination with the density of the absorbent region 1a, the liquid absorption amount of the entire absorbent body is reduced unlike the case where the density is simply increased. High absorption can be maintained without using it. In addition, the thickness of the high-density and high basis weight region 1a can be made the same as that of the low-density and low basis weight region 1b, so that the fit with the body can be maintained.

FIG. 3 is a cross-sectional view schematically showing a part of the manufacturing process (absorber precursor setting process) in the preferable manufacturing method of the absorbent article shown in FIG. In the manufacturing method of this embodiment, the absorber is formed by a pair of rolls. In particular, in the manufacturing process shown in FIG. 3, absorber precursors (thick portion 35a and thin portion 35b) having partially different thicknesses. Is shown on the upper surface of the lower roll 32 (the state before the absorber precursor is compressed). The upper surface u of the absorber precursor 35 has a cross-sectional shape in which the thick portion 35a is high (height t ₃ ) and the thin portion 35b is low (height t ₂ ). And this upper roll is arranged so that the upper roll 31 may press the absorber precursor 35 from above (however, in order to distinguish the shape of the upper roll 31 from the absorber precursor 35 in FIG. When the absorber precursor is pressed while the roll rotates, the auxiliary line 36a (line corresponding to the lower end of the cross section of the upper roll) is positioned near the position of the auxiliary line 36b. Set to be). The upper roll 31 is provided with a plurality of teeth (convex portions) 33, thereby compressing the absorber precursor as a whole and forming concave portions (embosses).

The thickness of the formed after compression absorber 1 (see FIG. 2) is the t _1. At this time, normally, the thickness t ₁ of the absorber is substantially equal to the thickness t ₂ of the precursor, or t ₁ is slightly thinner. The distance between the two rolls when the absorber precursor is compressed by the upper roll and the lower roll is not particularly limited, and may be determined in consideration of the density and thickness of the entire absorbent body after compression. The thick portion 35a (see FIG. 3) of the absorber precursor 35 which is pressed by the above becomes the high density and high basis weight region 1a (see FIG. 2) of the absorber.

  Thus, by compressing at least the thick part of the absorber precursor and simultaneously providing the concave part, it is efficient without the trouble of performing each separately. Here, if the absorbent body is simply provided with the high density high basis weight region 1a and the low density low basis weight region 1b and the thicknesses of both are made uniform, the sparse portion can be separately pressed and embossed and adjusted. is there. However, especially when the shape of the dense portion is complicated, it may be difficult to align the emboss position and phase. Even in such a case, by performing embossing at the same time as pressing as in the manufacturing method of the present embodiment, stable molding can be performed regardless of the position and phase of the emboss. Therefore, for example, even when forming an absorbent body having a complicated shape that gives cushioning properties following the undulating skin part, it is possible to suitably cope with the absorbent body with stable quality and An absorbent article having this can be manufactured.

  In the manufacturing method of this embodiment, the absorber precursor is three-dimensionally shaped and has the thick part 35a and the thin part 35b as described above. Thus, as a method of three-dimensionally forming the member into a desired shape, the above-described standing volume fiber technology (see, for example, Patent Documents 1 and 2) can be used.

If it says in more detail about each material of an absorbent article, it is preferable that the surface sheet 2 consists of a soft material which is liquid-permeable and hits skin. For example, a non-woven fabric made of natural fibers such as cotton, a non-woven fabric made of various synthetic fibers subjected to a hydrophilic treatment, or a sheet in which a plastic film is perforated can be used. The basis weight of the topsheet ² is preferably 15 to 60 g / m ^{2 and} more preferably about 20 to 40 g / m ² . The manufacturing method of the nonwoven fabric used for a surface sheet can be suitably selected according to the composition and characteristic of the fiber to be used. For example, it is preferable to manufacture by a spunlace method, a thermal bonding method, an air-through method, a spunbond method, or the like. The top sheet may be a single sheet or a combination of a plurality of sheets.

The back sheet 3 is preferably made of a liquid-impermeable sheet material. The basis weight of the backsheet is preferably 15 to 60 g / ^{m 2,} and more preferably about 20~45g / ^{m 2.} The back sheet may be water vapor permeable as required. Specifically, in order to obtain sufficient water vapor permeability, a film made of a synthetic resin such as polyethylene in which fine powder made of a filler such as calcium carbonate is dispersed is stretched, and a porous film having fine holes is used. It is preferable. As described above, the back sheet may be a single sheet or a combination of a plurality of sheets and non-woven fabrics.

  As a forming material of the absorber 1, what is normally used for an absorbent article can be used. Specifically, for example, a fiber assembly or a combination of this and a polymer water-absorbing polymer can be used. As the fibers constituting the fiber assembly, hydrophilic natural fibers such as pulp fibers, cellulosic synthetic fibers such as rayon, and other synthetic fibers (preferably subjected to hydrophilic treatment) can be used.

FIG. 4 is a plan view schematically showing a sanitary napkin as an embodiment (embodiment 2) of the absorbent article of the present invention. In the absorber 41 shown in the figure, the density and basis weight are different in the three regions. Specifically, it is divided into a high density high basis weight region 41a, a medium density medium basis weight region 41c, and a low density low basis weight region 41b, and the density and the basis weight are decreased in this order. By doing in this way, the change of the density and basic weight from the high density high basic weight area | region 41a to the low density low basic weight area | region 41b can be made moderate via a medium density medium basic weight area | region, for example, a wearer is uncomfortable. There is an advantage of not giving.

  In the sanitary napkin 20 of the second embodiment, a large number of embosses 5 are provided in the high density and high basis weight region 41a and the medium density and medium basis weight region 41c, and the action of the emboss 5 is described in the first embodiment. It is the same as that.

  FIG. 5 is a plan view schematically showing a sanitary napkin 30 as still another embodiment (third embodiment) of the absorbent article of the present invention. The absorbent body 61 according to the third embodiment is provided with two island-like high density and high basis weight regions 62a and 63a so as to be surrounded by the low density and low basis weight region 61b. The densities and basis weights of the regions 62a and 63a are substantially equal, and both are higher than the density and basis weight of the region 61b. And in this Embodiment 3, like the thing shown in figure, the wide high density high basic weight area | region 62a extended from the approximate center part of the sanitary napkin to the front part is distribute | arranged, and the narrow high density high basic weight area | region 63a is arranged in the rear part. It is arranged. At this time, the emboss 5 is provided in both of the high density and high basis weight regions 62a and 63a. By providing a plurality of high-density, high-basis-weight areas in the absorbent body surface in such a form, the liquid holding ability at a necessary location is strengthened, and back leakage and oblique back leakage are prevented. Moreover, it becomes easy to bend back and forth due to the difference in rigidity, and the fitting property is improved. In addition, you may divide a high-density, high basic weight area | region into three or more island-like area | regions, and should just arrange | position suitably according to the function calculated | required.

  FIG. 6 is a cross-sectional view schematically showing a sanitary napkin 40 as still another embodiment (Embodiment 4) of the absorbent article of the present invention. In the absorbent body 71 of the fourth embodiment, low density and low basis weight regions 71b and high density and high basis weight regions 71a are alternately arranged in the width direction (X direction). In terms of a plane direction (a plan view is not shown), linear high density and high basis weight regions 71a are alternately arranged substantially in parallel in the width direction with the linear low density and low basis weight regions 71b interposed therebetween. It is assumed that it is a form. By setting it as such a form, the spreading | diffusion of the liquid to the width direction can be suppressed further, and the absorber before and behind can be used effectively.

  FIG. 7 is a cross-sectional view schematically showing a sanitary napkin 50 as still another embodiment (Embodiment 5) of the absorbent article of the present invention. The absorber 81 in the fifth embodiment is formed as a composite of plate-like or sheet-like absorbent members 83 and 82. The absorbent member 83 has a high density and high basis weight region 83a, and has a low density and low basis weight region 83b around it. And it has the embossing 5 in the surface sheet side of this high-density, high basic weight area | region 83a (this absorptive member 83 is equivalent to the absorber 1 of this Embodiment 1, preferred ranges, such as a dimension and a density, a manufacturing method, etc. are This is the same as in Embodiment 1.) An absorbent member 82 is further laminated on the surface sheet side of the absorbent member 83. The density and basis weight of the absorbent member 82 are substantially the same as the low density and low basis weight region 83b of the absorbent member 83, or are lower density and lower basis weight. That is, when the high density and high basis weight region 83a is viewed in the thickness direction (Z direction) of the absorbent body 81, the density is provided. By adopting such a form, the absorbent member 82 enhances the close contact with the excretory part during use to ensure the absorption of the liquid, and the liquid absorbed there is successively high density and high basis weight. The part 83a absorbs and holds. Thus, while having a sufficient absorption amount, the vicinity of the close contact portion with the excretion portion is kept relatively dry.

  FIG. 8 is an enlarged plan view schematically showing a preferred embodiment of the emboss pattern. As described above, the embossing is preferably provided in a form that is functionally adjusted according to the density of the absorber. At this time, for example, it is preferable that the embossing pattern has the longitudinal direction of the absorbent body as illustrated (the Y direction shown in FIG. 8 corresponds to the article longitudinal direction (Y direction) in FIG. 1). . Here, the embossed pattern in the longitudinal direction is an embossed pattern that can diffuse liquid more preferentially in the longitudinal direction with respect to the article width direction. Specifically, like the one shown in the figure, when an element constituting the emboss pattern is taken out, it is preferable that its shape extends long in the longitudinal direction (Y direction). For example, referring to FIG. 8A, it is a cross-shaped embossing element, and the linear embossing in the longitudinal direction (Y direction) constituting the cross is more than the linear embossing in the width direction (X direction). It is long and preferable. 8D, the X-shaped embossed element is divided at the center, and the length of the X-shaped element in the longitudinal direction (Y direction) is the width direction (X direction). ) Have been longer. In FIG.8 (e), the longitudinal direction of a rhombus element is made longer.

  The absorbent article of the present invention is not limited to the specific configuration of the sanitary napkin described above. For example, other functional members and structures may be applied, and other members other than the absorber may be appropriately used. Embossing or the like may be provided on the surface. Further, in the present invention, the absorbent article is not particularly limited and includes an article having absorbency such as liquid, but is preferably a sanitary napkin, a light incontinence pad, or a diaper.

It is a top view which shows typically the sanitary napkin as one Embodiment of the absorbent article produced with the manufacturing method of the absorbent article of this invention. It is sectional drawing which shows the II-II line cross section in FIG. It is sectional drawing which shows typically a part of manufacturing process in the preferable manufacturing method of the absorbent article shown in FIG. It is a top view which shows typically the sanitary napkin as embodiment of the absorbent article of this invention. It is a top view which shows typically the sanitary napkin as another embodiment of the absorbent article of this invention. It is sectional drawing which shows typically the sanitary napkin as another embodiment of the absorbent article of this invention. It is sectional drawing which shows typically the sanitary napkin as another embodiment of the absorbent article of this invention. It is an enlarged plan view which shows typically preferable embodiment of an embossing pattern.

Explanation of symbols

1, 41, 61, 71, 81 Absorber 2 Top sheet 3 Back sheet 5 Emboss (concave part)
6 Part where density is further increased (lower part of recess)
9 Side seal part 10, 20, 30, 40 Sanitary napkin 31 Upper roll 32 Lower roll 33 Teeth 35 Absorber precursor 36a, 36b Auxiliary line showing lower end of upper roll section

Claims (7)

An absorbent article including an absorbent body, wherein the absorbent body has a high density and high basis weight area, a medium density and a medium basis weight area, and a low density and low basis weight in the width direction from the center to both sides. Absorbent articles that are divided into regions, in which the density and basis weight are lowered in this order, and have a recess in the high-density, high basis weight region . The absorbent article of Claim 1 which has the said recessed part in the said medium density medium basic weight area | region. 3. The absorbent article according to claim 1 , wherein a region where the density and basis weight are increased in the absorbent body has substantially the same thickness as a region where the density and basis weight are not increased. The basis weight of the density and basis weight is increased area for basis weight in the region not increased density and basis weight, any of claim 1 to 3 is 1.5 to 2.5 times the absorbent article according to any one of claims. The concave portion is composed of a linear emboss extending in the width direction of the absorbent article and a linear emboss extending in the front-rear direction, and the linear emboss extending in the width direction is shorter than the linear emboss extending in the front-rear direction. The absorbent article of any one of 1-4 . The absorbent body is a lower absorbent member, and an upper absorbent member having a density lower than the density of the region where the density and basis weight are increased is disposed above the region where the density and basis weight are increased. The absorbent article according to any one of to 5 . Compressing the absorber precursor with a predetermined portion having a higher basis weight than the other portions, in the width direction of the absorber, toward the both sides from the center portion, high density high basis weight region, medium density medium basis weight In order to form an absorbent body having a recess in the high density and high basis weight region, the density and basis weight are divided in this order, and the density and basis weight are reduced. at the same time providing the embossed portion to the high basis weight, to form the high-density high basis weight region having said recess by said embossed by compressing the portion of the at least the high basis weight, and disposing the absorber A manufacturing method for absorbent articles manufactured by Tense.

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