KR20080028771A - Absorbent articles - Google Patents

Abstract

An absorbent article is provided to make liquid move fast from a skin contact surface to a non-skin contact surface, to have good capacity of being diffused inside an absorbent body, and to achieve good wearing feelings. An absorbent article includes a surface sheet(2), a rear sheet and an absorbent body interposed between the surface sheet and the rear sheet. One or more upper layer absorbent bodies(41a) are laminated on the skin contact surface of a lower absorbent body(42(4)). The upper layer absorbent body is bonded and integrated with the lower absorbent body by plural deep concave portions in the center portion. The concave portion is formed to be concave from the non-skin contact surface of the lower layer absorbent body to the skin contact surface of the upper layer absorbent body, and penetrates the lower layer absorbent body.

Description

Absorbent article {ABSORBENT ARTICLES}

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

Conventionally, in absorbent articles, such as a sanitary napkin, in order to improve adhesiveness to a body and leakage prevention property, it is known to protrude an absorber from the center part or center part to the buttocks. The absorbent article of this species is intended to prevent the formation of a gap between the skin contact surface and the wearer's skin and to reduce the leakage of body fluids through the skin contact surface of the absorbent article or the wearer's skin. In this absorbent article, the absorbent body has a middle portion, and the adhesion between the non-skin contact surface and the excretory portion of the absorbent article at the time of wearing is improved.

The middle portion of the absorber may be formed by stacking an upper absorber on the lower absorber, for example. In addition, the thickness of the absorber may be increased only at the center thereof, so that an absorber having a middle portion may be integrally formed. In any case, the used portion is a portion where body fluid is directly excreted, and is formed so as to have a thickness of the absorber larger than other portions at a position facing the liquid excretion portion of the wearer.

For example, Utility Model Publication No. Hei 5-24025 discloses a sanitary napkin in which an upper absorber is formed on a lower absorber. In addition, Japanese Patent Laid-Open No. 2003-33397 discloses a sanitary napkin having an absorbent body in which the middle and middle portions are integrally formed.

The absorbent article of the present invention has an absorbent body interposed between the surface sheet, the back sheet, and both sheets, and is substantially vertical in length. The absorber is formed by laminating one or a plurality of upper absorbers on the skin contact surface of the lower absorber. One or more of the upper absorbers are integrally joined to the lower absorbers by a plurality of deep recesses at least in the center of the upper absorbers. The deep concave portion is not formed in the back sheet, but is formed concavely from the non-skin contact surface side of the lower layer absorber toward the skin contact surface side of the upper layer absorber, and penetrates the lower layer absorber in the thickness direction thereof. A bottom is located in the upper absorber.

In the absorbent article, a plurality of shallow recesses are formed in the lower absorber except for the portion in which the upper absorber is stacked, and the lower absorber is formed at each of both side edges in the longitudinal direction of the absorbent article in the upper absorber. It is preferable that the emboss groove extending in the said longitudinal direction is formed in the outer side of this, and the said surface sheet | seat and the said lower layer absorber are integrally joined by this emboss groove.

As described above, since the sanitary napkin has a middle portion, the liquid absorption retention performance of the central portion is higher than that of other portions. However, since the middle portion has a large thickness of the absorber, the liquid absorption retention performance in the entire thickness direction of the absorber may not be sufficiently exhibited. For example, the body fluid excreted in the middle and high parts may not move quickly from the skin contact side to the non-skin contact side, and in such a case, a dry feeling at the time of wearing a napkin is hardly obtained.

Also, in the middle and high parts, even if the excreted body fluid moves quickly from the skin contact side to the non-skin contact side, the body fluid absorbed in the center portion of the absorber does not sufficiently diffuse the inside of the absorber toward the outside of the absorber. There is a case where the entire liquid absorption retention performance is not sufficiently exhibited.

Accordingly, the present invention relates to an absorbent article having a multi-layered absorbent body, which has a rapid movement of liquid from the skin contact surface side to the non-skin contact surface side, has a good diffusion property of the liquid in the absorbent body, and is excellent in fit.

According to the absorbent article having the absorber composed of the multilayer of the present invention, the liquid is rapidly moved from the skin-contacting surface side to the non-skin-contacting surface side, the diffusion property in the absorbent body is good, and the wearing feeling is excellent.

EMBODIMENT OF THE INVENTION Hereinafter, the absorbent article of this invention is demonstrated, referring drawings for based on the preferable embodiment.

The absorbent article 1 of this embodiment is a sanitary napkin, and is interposed between the liquid permeable surface sheet 2, the air permeable and liquid permeable back sheet 3, and both sheets, as shown in Figs. It has a liquid-retaining absorbent (4), and is substantially vertical in length.

The absorber 4 in the sanitary napkin (hereinafter also referred to simply as a napkin) of the present embodiment is formed by laminating one upper absorber 41 on the skin contact surface of the lower absorber 42, and the upper absorber The 41 is integrally joined to the lower absorber 42 by a plurality of deep recesses 5, 5... At least in the central portion of the upper absorber 41.

In addition, in the lower absorbent body 42 of the napkin 1 of this embodiment, many shallow recessed parts 6,6 ... are formed except the part which the upper absorber 41 is laminated | stacked, and the lower absorber 42 is provided. Embossing 42 extends in the longitudinal direction on the outer side of each of the side edges 41a and 41a in the longitudinal direction of the napkin 1 in the upper absorbent body 41 (hereinafter also referred to simply as the napkin longitudinal direction). The groove 7 is formed, and the surface sheet 2 and the lower layer absorbing layer 42 are joined together by the embossed groove 7.

The napkin 1 is demonstrated in detail below in this embodiment.

The napkin 1 has a front portion A, a discharging portion opposing portion B whose longitudinal direction is a central region in the longitudinal direction (a portion having a discharging portion opposing region disposed in the width direction center opposite to the liquid discharging portion of the wearer) and It is divided into the rear part C.

Each of the front sheet 2 and the back sheet 3 has a longitudinal length, and its longitudinal direction coincides with the longitudinal direction of the napkin 1 (hereinafter also referred to simply as the napkin longitudinal direction). The surface sheet 2 forms the skin contact surface which contacts the wearer's skin at the time of wearing a napkin.

The absorbent body 4 is a longitudinal length, and the longitudinal direction is consistent with the napkin 1. As shown in FIG. 2, the absorber 4 is wrapped in the board | substrate 9, and is pinched and fixed between the front sheet 2 and the back sheet 3. As shown in FIG.

In addition, each of the front sheet 2 and the back sheet 3 is directed from each of the longitudinal front and rear ends of the absorbent body 4, and is joined to each other by a known joining method such as a heat seal in the directed portion. The end seal part is formed. Moreover, each of the front sheet 2 and the back sheet 3 is directed from each of the width direction both ends of the absorber 4, and is joined similarly.

The absorber 4 is demonstrated in detail below.

As shown in FIG. 1 and FIG. 2, the absorber 4 has a laminated structure of the upper absorber 41 and the lower absorber 42. As shown in FIG. Each of the upper absorber 41 and the lower absorber 42 has a vertical length, and the longitudinal direction thereof coincides with the napkin longitudinal direction. Each of the upper absorber 41 and the lower absorber 42 is preferably formed of pulp fibers or the like.

The lower layer absorber 42 is smaller than the napkin 1 and is substantially the same shape. The dimension of the upper absorber 41 is smaller than the lower absorber 42 in length and width, respectively. The upper absorber 41 is laminated on the skin contact surface side (body surface side) at the center of the lower absorber 42 and forms the middle portion of the absorber 4. Specifically, the upper absorbent body 41 is disposed at the center of the width direction (hereinafter, also simply referred to as the napkin width direction) of the napkin 1 in the excreted part opposing portion B, and the upper absorber 41 Each of the front and rear ends is directed to each of the front portion (A) and the rear portion (C). That is, the upper absorbent body 41 extends from the front part A to the rear part C via the excretion part opposing part B. As shown in FIG. The upper absorber 41 is a portion that receives the body fluid through the surface sheet 2 when the napkin is worn, facing the liquid excretion portion of the wearer.

The upper absorber 41 is joined to the lower absorber 42 by a plurality of deep recesses 5, 5. In the present embodiment, the upper absorber 41 is integrated with the lower absorber 42 by the deep recesses 5, 5... Between the central portion and the entire peripheral edge thereof. The deep concave portion 5 is circular in plan view, discretely discontinuously formed, and is formed in an arrangement pattern of a grating shape as a whole. In the present embodiment, each of the deep recesses 5, 5... Is formed by embossing.

As shown in FIG. 2, each of the deep recesses 5, 5... Is not formed in the back sheet 3 and is directed from the non-skin-contacting side of the lower layer absorber 42 toward the skin-contacting side of the upper layer absorber 41. It is formed as a recess and penetrates the lower layer absorber 42 in the thickness direction, and its bottom portion (the most recessed portion in the deep recess 5) is located in the upper layer absorber 41. That is, each of the deep recesses 5 and 5 is formed by recessing only the absorber 4 (the upper absorber 41 and the lower absorber 42), and the upper absorber ( 41) is formed crazy inside. A part of the fibers constituting the lower absorber 42 in the deep concave portion 5 is integrally consolidated with the fibers constituting the upper absorber 41 while entering the upper absorber 41.

The upper absorber 41 and the lower absorber 42 are joined by a plurality of deep recesses 5, 5... And are integrated in a close contact.

The bottom of each of the deep recesses 5, 5... Is located in the upper absorber 41 as described above, and each of the deep recesses 5, 5... Not penetrating The bottom of each of the deep recesses 5, 5... Is the lower portion of the upper layer absorber 41 downward (on the non-skin contact side) from the skin contact surface (the skin contact surface of the absorber 4) of the upper layer absorber 41. More preferably, the distance corresponding to 10 to 80% of the thickness is more preferably located, and the distance corresponding to 20 to 50% of the thickness is more preferably located. The bottom portion of each of the deep recesses 5, 5... Is in this position, so that the upper absorber 41 and the lower absorber 42 are not excessively hardened, and the lower absorber 42 is formed by the upper absorber 41. It is possible to effectively fit them in, so that these two layers 41 and 42 can be consolidated more integrally.

As for the part in which the deep recessed part 5 of each of the upper absorber 41 and the lower absorber 42 is formed, the fiber which comprises each absorber is compacted, and the density is high. The deep concave portion 5 has a higher capillary force due to consolidation, and acts as a conductive path through which liquid flows from the upper absorber 41 to the lower absorber 42, and the upper absorber The diffusivity in the planar direction of the liquid in 41 is also enhanced at the same time.

The density of the portion where the deep concave portion 5 is formed is preferably from the viewpoint of effectively imparting capillary force to both of the layers 41 and 42 without excessively curing the upper absorber 41 and the lower absorber 42. Is 0.2 to 1.2 g / m ³ , more preferably 0.35 to 0.6 g / m ³ . Here, the "density of the portion where the deep recesses 5 are formed" is defined between the bottom portion of the deep recesses 5 and the skin contact surface of the upper absorbent body 41 (skin contact surface of the absorber 4). It means the density of the area where it is located.

On the other hand, the density of parts other than the "part in which the deep recesses 5 are formed" in the absorbent body 4 is smaller than the "part in which the deep recesses 5 are formed", and preferably 0.01. 0.4g / m <^3> , More preferably, it is 0.02-0.2g / m <^3> .

The said density (density of predetermined location of an absorber) is calculated | required as follows. In other words, the absorber having the basis weight measured in advance is cut in the thickness direction of the absorber at the desired location of the density, the cut surface is observed under a microscope (electron microscope VH8000 manufactured by Keyence), and the thickness of the desired location is measured. The density of the said location is computed from the measured value of thickness and basis weight of an absorber. For cutting the absorber, it is preferable to use a sharp knife (for example, FAS-10 manufactured by Feather Safety Razor) from the point of view that the structure of the cutting surface and the absorber in the vicinity thereof is not changed as much as possible before cutting.

The absorber 4 which has many deep recesses 5, 5 ... can be produced as follows, for example. First, the upper absorber 41 is laminated on the lower absorber 42 (on the skin contact surface) to form a laminate, and then the laminate is allowed to be embossed on the non-skin contact surface side. The embossing roll having the embossed convex part regularly arranged on the surface and the opposed anvil roll opposed thereto is sent to the embossing device and embossing is performed. In this embossing process, it is preferable to adjust the space | interval of embossing roll and anvil roll, the height of embossing convex part, etc. so that the embossed convex part may go to the inside of the upper absorber 41 inside.

As shown in Figs. 2 and 3, the lower layer absorber 42 has a portion in which the upper absorber 41 is stacked and a region Q having a predetermined width outside the front circumference edge of the upper absorber 41. Except for this, a large number of shallow recesses 6, 6... In FIG. 4, the area | region R in which the shallow recessed part 6,6 ... in the lower layer absorber is formed is shown by diagonal line. In FIG. 4, the region Q is a portion in which the upper absorber 41 is stacked and the region R in which the shallow recesses 6, 6... Are formed. In the present embodiment, each of the shallow recesses 6, 6 is formed by embossing.

In this specification, the "deep" of the deep recessed part 5 and the "shallow" of the shallow recessed part 6 have the meaning which distinguishes the depth of a recessed part relatively, respectively. In further detail, in the present embodiment, the deep concave portion 5 is formed so that the upper absorber 41 and the lower absorber 42 are integrally bonded to each other, and only the shallow concave portion 6 and the lower absorber 42 are formed. .

The shallow concave portion 6 is circular in plan view, discretely discontinuously formed, and is formed in an arrangement pattern of a grating shape as a whole. In the present embodiment, the shallow recesses 6 are arranged such that the distance between the shallow recesses 6 is smaller than the distance between the deep recesses 5. This is to impart a capillary force gradient between the region of the deep recess and the region of the shallow recess, and has a function of promoting the transfer of the liquid to the outside. As another method of imparting such a capillary force gradient, a method such as increasing the area of each recess and increasing the ratio of the recess in the absorber 41 may be used.

As shown in FIG. 2, the shallow concave portions 6, 6 are formed so as to affect the inside of the lower absorber 42 at the non-skin contact side of the lower absorber 42. As shown in FIG. Each of the shallow concave portions 6, 6 ... forms a concave portion on the non-skin contact side of the lower layer absorber 42. As shown in FIG. As for the part in which the shallow recessed part 6 of the lower layer absorber 42 is formed, the fiber which comprises the said absorber becomes condensed, becomes high density, and the capillary force is raised. Further, each of the deep recesses 5, 5 ... is formed deeper than each of the shallow recesses 6, 6 ....

An absorbent body 4 having a large number of shallow recesses 6, 6... And a large number of deep recesses 5, 5 can be produced, for example, as follows. An absorbent body 4 having a plurality of deep recesses 5 and 5 formed thereon is embossed roll having regular embossed convex portions on its circumferential surface so as to be embossed on the non-skin-contacting contact side thereof, and to face them. It is sent to the embossing device equipped with anvil roll and embossing is performed. In this embossing process, it is preferable to provide the area | region in which the embossed convex part does not exist in the embossing roll so that the embossed convex part may extend only inside the lower layer absorber 42. Moreover, it is also preferable to adjust the space | interval of emboss roll and anvil roll, the height of the embossed recess, etc. Further, after forming a plurality of shallow recesses 6, 6, ... in the lower absorber 42, the upper absorber 41 and the lower absorber 42 are laminated, and the plurality of deep recesses 5 in this laminate. (5) may be formed.

In addition, the emboss roll side (skin contact surface side in FIG. 2) in the absorbent body 4 of the part in which the deep recessed part 5 or the shallow recessed part 6 is formed is an anvil roll side (per skin non-in skin in FIG. 2). The contact surface may also be recessed. This is thought to be due to the movement of the fibers constituting the skin contacting surface side of the absorber 4 toward the non-skin contacting surface side in order to stabilize the state in which the embossed portions are formed. Since it extends to the side of a process surface, it has a coating liquid effect.

Next, the emboss groove 7 is demonstrated in detail below.

The lower layer absorber 42 has a pair of embossed grooves 7, 7 formed on both sides of the upper layer absorber 41. As shown in FIGS. 2 and 4, the pair of embossed grooves 7 and 7 is formed in the region Q in which the shallow concave portion 6 is not formed. That is, the shallow recessed part 6 is not formed in the area | region Q in which the emboss groove 7 is formed.

As shown in FIG. 3, each of the pair of embossed grooves 7 and 7 has portions 7a, 7b and 7c which are convexly curved toward the outside in the width direction in the napkin 1. It has three connected shapes in the longitudinal direction of. The convexly curved part 7b located in the center is located outside the napkin width direction of the excretion part opposing area | region (central part of the napkin width direction of the excretion part opposing part B) in the napkin 1. The portion 7b is located outside the side edge 41a in the longitudinal direction in the upper absorber 41 in the excreted portion opposing portion B. As shown in FIG.

In further detail, the longitudinal front and rear ends of each of the pair of embossed grooves 7 and 7 are connected by embossed grooves extending in the napkin width direction. The embossed groove extending in the napkin width direction has a convex shape toward the outside of the napkin length direction. That is to say, the lower absorber 42 has a closed annular emboss groove including a pair of emboss grooves 7, 7.

The surface sheet 2 is joined to the lower layer absorber 42 by the annular emboss groove and is integrated.

The part of the annular emboss groove has a high density because the fibers constituting the lower absorber 42 are compacted and have a high density. Moreover, it has convex formation and annular shape toward the outer side of a napkin longitudinal direction. Therefore, the part of the lower layer absorber 42 inside this annular emboss groove is high in planar stability, and generation | occurrence | production of the wrinkles and torsions with some unevenness are suppressed. Furthermore, since the upper absorber 41 is joined to the upper part of the lower absorber 42 inside the annular emboss groove, the integration between the upper absorber 41 and the lower absorber 42 is deep. It is raised stably through use by the joining by (5) and a groove.

Therefore, the body fluid absorbed by the upper absorbent body 41 quickly moves to the lower absorbent body 42 which has high adhesion with the upper absorbent body 41 and is integrated, and is first absorbed and retained in the center portion of the absorbent body 4. At this time, the body fluid mainly moves through the deep recesses 5, 5. In addition, as shown in FIG. 2 and FIG. 4, since the deep recessed part 5 is formed in the lower absorber 42 side, the density of the lower absorber 42 is higher in the periphery of the deeper recessed part 5 than the upper absorber. It tends to be formed slightly higher than the density of (41), and the plating liquid effect to the lower absorber 42 is heightened more.

The body fluid absorbed and retained in the central portion of the absorbent body 4 is condensed in the region Q and moves inside the lower absorbent body 42 toward the outside of the absorbent body 4 through the annular emboss groove having a high maternal force. Move to the area (R). Furthermore, the body fluid moved to the region R is further diffused outward of the lower absorber 42 through the plurality of shallow recesses 6, 6..., So that the absorbent performance of the lower absorber 42 is efficiently used. . As a result, a good state in which the body fluid moves quickly from the upper absorbent body 41 to the lower absorber 42 is maintained.

 In addition, since the groove has a convex shape that is outwardly swollen in the excretion facing region B, the diffusion in the lateral direction of the liquid reaching the groove is gentle at the center thereof, and when the liquid comes into contact with the groove, the density becomes low. Diffusion in the longitudinal direction of the raised groove and retention and diffusion of the liquid by the shallow recesses 6 occur. On the other hand, in the front part and the rear part of the excretion part opposing area B, the diffusion to the groove occurs relatively quickly, the diffusion in the longitudinal direction of the groove is superior, and the liquid of the liquid to the shallow concave portion 6 compared to the center portion. Reach slows down. In other words, the positional relationship of the grooves in the region Q is changed, and in the center of the excrement facing portion B, the groove is close to the shallow concave portion 6 and deep before and after the excreting portion facing region B. It is close to the recess 5. For this reason, not only the liquid retention property in a center part is high, but also the inconvenience of liquid backflow etc. can be suppressed, and also the leakage to a side direction and an inclination direction can be suppressed.

In addition, when the amount of the excreted body fluid is large, some of the excreted body fluid on the surface sheet 2 may be directly absorbed into the lower layer absorber 42 through the annular emboss groove.

It is preferable that the dimension etc. of the napkin 1 of this embodiment are designed suitably according to the specific use. In addition, the dimensions of the upper absorber 41, the lower absorber 42, the deep concave portion 5, the shallow concave portion 6, and the embossed groove 7, etc. may also be appropriately selected depending on the size of the napkin 1 and its specific use. It is desirable to be designed.

For example, when the napkin 1 has a large amount of blood clots or is used for long time use such as at night, the napkin 1 is preferably designed as follows.

It is preferable that the dimension of the napkin 1 is 20-50 cm in length, especially 27-50 cm, 5-10 cm in width, especially 7-10 cm.

The upper absorber 41 has a length of 5 to 20 cm, particularly 7 to 17 cm, a width of 2 to 4.5 cm, and particularly 2.5 to 3.5 cm. In addition, it is preferable that the basis weight of the upper absorber 41 is 100-1000 g / m <^2> , especially 150-600 g / m <^2> .

The lower absorber 42 has a length of 15 to 50 cm, particularly 25 to 45 cm, a width of 5 to 10 cm, and particularly 7 to 10 cm. In addition, the basis weight of the lower absorber 42 is preferably 100 to 600 g / m ² , particularly 150 to 300 g / m ² .

Moreover, it is preferable that the diameter of the deep recessed part 5 is 0.8-4 mm, especially 1-3 mm. The distance between the deep recesses 5 (for example, the distance between the centers) is preferably 2 to 10 mm in the longitudinal direction of the napkin, particularly 3 to 7 mm, and 2 to 10 mm, particularly 3 to 7 mm in the napkin width direction. Moreover, it is preferable that the depth of the deep recessed part 5 is 2 to 50%, especially 10 to 40% with respect to the thickness of the part in which the upper absorber 41 in the absorber 4 is laminated | stacked.

The diameter of the shallow concave portion 6 is preferably 0.8 to 4 mm, particularly 1 to 3 mm. Moreover, it is preferable that the distance (for example, the distance between centers) between shallow recesses 6 is 2-10 mm, especially 3-7 mm in a napkin longitudinal direction, 2-10 mm, especially 3-7 mm in a napkin width direction. In addition, the depth of the shallow concave portion 6 is preferably 2 to 50%, particularly 10 to 40% with respect to the thickness of the lower absorber 42.

When the lower layer absorber 42 is planarized, the width of the area Q outside the front edge at the upper layer absorber 41 is preferably 5 to 15 mm, particularly 7 to 12 mm. As long as this width | variety of the area | region Q exists in the said range, it may be constant or may change.

Furthermore, the width of the embossed groove 7 is preferably 0.5 to 0.4 mm, especially 0.8 to 2 mm.

Next, each material which forms the napkin 1 of this embodiment is demonstrated.

First, the material for forming the surface sheet 2 is not particularly limited as long as it is a liquid-permeable sheet, but for example, a large number of protrusions 24 protruding toward the skin contact surface side as shown in Figs. 5 (a) and (b). It is preferable to use an uneven sheet having a.

The surface sheet 2 which consists of the uneven | corrugated sheet in this embodiment consists of the 1st fiber layer 21 of the skin contact surface side, and the 2nd fiber layer 22 of the non-skin contact surface side. The first fiber layer 21 and the second fiber layer 22 are partially heat-sealed to form a heat-sealed portion 23 as a recess. The first fiber layer 21 has a plurality of convex portions 24 having compressive elasticity at portions other than the heat-sealed portion 23.

The uneven sheet is formed by thermally bonding the first fibrous layer 21 and the second fibrous layer 22 made of fiber aggregates in a predetermined pattern by heat embossing, and then, the second fibrous layer 22 in the male direction. It is obtained by thermal contraction with. Specifically, thermal fusion by thermal embossing, for example, the embossed surface (main surface of the embossed roll, etc.) in which a large number of embossed pins are regularly disposed, the first fiber layer 21 and the second fiber layer 22 It press-contacts to the 1st fiber layer 21 side in a laminated body, and melts the constituent fibers of the 1st fiber layer 21 and / or the 2nd fiber layer 22 in the site | part pressed by each pin.

The heat shrink of the second fiber layer 22 is, for example, whether the second fiber layer 22 is composed of heat shrinkable fibers or the heat shrinkable fibers are included in the second fiber layer 22, and the first fiber layer 21 and the second The heat treatment is performed by heating the second fiber layer 22 at the same time as the fiber layer 22 is heat-sealed or after both are heat-sealed. Many of the convex portions 24 are formed by deforming a portion of the first fiber layer 21 other than the heat-sealed portion 23 in a convex shape by thermally contracting the second fiber layer 22 in the horizontal direction.

It is preferable that the plurality of heat-sealed portions 23 are regularly formed in a scattered shape or a zigzag shape. The distance between the heat-sealing parts 23 is substantially constant.

Each convex part 24 forms a dome shape, The inside is filled with the fiber which comprises the 1st fiber layer 21. As shown in FIG. In addition, although the interface of the 1st fiber layer 21 and the 2nd fiber layer 22 in the part in which each convex part 24 was formed is not joined, it is in the state of being in close contact.

It is preferable that the constituent fibers of the first fiber layer 21 have substantially no heat shrinkability, or do not heat shrink below the heat shrink temperature of the constituent fibers of the second fiber layer 22.

As the constituent fibers of the second fiber layer 22, those made of a thermoplastic polymer material and having heat shrinkability are suitable. In addition, the constituent fibers preferably exhibit elastomeric behavior even after shrinkage. Examples of such fibers include latent crimpable fibers. It is preferable that the content rate of the latent crimped fiber in the 2nd fiber layer 22 is 40-100 weight%. The latent crimpable fiber is a fiber having a property of being spirally crimped and contracted by heating at a predetermined temperature before being heated in the same manner as a fiber for a conventional nonwoven fabric. By using latent crimped fibers, both heat shrinkable and elastomeric behavior can be expressed simultaneously.

The latent crimped fiber is composed of, for example, an eccentric sheath type or a side byside type compound fiber composed of two kinds of thermoplastic polymer materials having different shrinkage ratios. As an example, the thing of Unexamined-Japanese-Patent No. 9-296325 and especially 2727331 is mentioned. The second fibrous layer 22 contains such latent crimped fibers, for example, and simultaneously or after heat fusion with the first fibrous layer 21, the crimp of the fibers can be expressed to shrink by heating. have.

As the material for forming the back sheet 3, the upper absorber 41 and the lower absorber 42 constituting the napkin 1 of the present embodiment, a material used for a conventional absorbent article can be used.

According to the napkin 1 of this embodiment mentioned above, since the movement of a liquid from a skin contact surface side to a non-skin contact surface is fast, it is excellent in a dry feeling. In addition, since the absorption performance of the lower layer absorber 42 is effectively used, it is preferably used when the amount of acupuncture points is large or when it is used for long time use such as liquid use.

The absorbent article of the present invention is not limited to the above-described embodiment, and can be appropriately changed as long as the gist of the present invention is not deviated.

For example, the absorbent article of the present invention may have a plurality of upper absorbers. In this case, each of the plurality of upper layer absorbers may be laminated in the thickness direction of the absorbent article, or each of the plurality of upper layer absorbers may be disposed in the longitudinal direction or the width direction of the absorbent article.

Moreover, in the napkin 1 of this embodiment, although the absorber 4 was packaged in the board | substrate 9 in the state in which the upper absorber 41 was laminated | stacked on the lower absorber 42, the workability of the napkin 1 is workable. In view of the above, each of the upper absorber 41 and the lower absorber 42 may be packaged by the earth.

Furthermore, in this embodiment, the napkin 1 may have a pair of wing part in the excretion part opposing part B. As shown in FIG. In addition, the napkin 1 may have a pair of side leak prevention parts in the both sides of the napkin longitudinal direction in the skin sugar surface side. In addition, the napkin 1 may have a pair of back flap parts in the back part B. As shown in FIG.

Further, the absorbent article of the present invention may be a sanitary napkin, but may be a panty liner or incontinence pad.

1 is a plan view showing one embodiment of a sanitary napkin as an absorbent article of the present invention.

FIG. 2 is an enlarged cross-sectional view taken along line X-Y of the sanitary napkin of FIG. 1.

3 is an enlarged plan view showing an embossed groove in the sanitary napkin of FIG. 1.

FIG. 4 is a plan view illustrating a region in which a shallow recess is formed in the sanitary napkin of FIG. 1.

Fig. 5A is an enlarged view of a part of the surface sheet of the sanitary napkin of Fig. 1 and is a longitudinal cross-sectional perspective view.

FIG. 5B is an enlarged cross-sectional view of a part of the surface sheet of the sanitary napkin of FIG. 1, and is an enlarged sectional view taken along the line Y-Y shown in FIG. 5A.

Claims (6)

In the absorbent article having an absorbent body interposed between the front sheet, the back sheet and both sheets, the absorbent article having a substantially vertical length, The absorber is formed by laminating one or a plurality of upper absorbers on the skin contact surface of the lower absorber, One or a plurality of the upper absorbers are integrally joined to the lower absorbers by a plurality of deep recesses at least in the central portion of the upper absorbers, The deep concave portion is not formed in the back sheet, but is formed concavely from the non-skin contact surface side of the lower layer absorber toward the skin glycoside surface side of the upper layer absorber, and penetrates the lower layer absorber in the thickness direction thereof. An absorbent article, characterized in that a bottom portion is located in the upper absorbent body. The method of claim 1, wherein the lower absorber is formed with a plurality of shallow concave portions, except for the portion in which the upper absorber is stacked, The lower layer absorber is formed with emboss grooves extending in the longitudinal direction on the outer sides of both side edges in the longitudinal direction of the absorbent article in the upper absorber, and the surface sheet and the lower layer are formed by the emboss grooves. An absorbent article, wherein the absorbent body is integrally bonded. The absorbent article as set forth in claim 2, wherein said shallow recess is not formed in the region where said emboss groove is formed. The absorbent article as set forth in claim 2 or 3, wherein said upper absorber has a longitudinal length, and said upper absorber is laminated on a central portion of said lower absorber. The said embossed groove is a convex curved part toward the outer side of the said absorptive article, The said embossed groove has the shape which connected one or more in the said longitudinal direction of the said absorbent article, and convexly The said curved part is located in the outer side of the excretion part opposing area | region in the said absorbent article, The absorbent article characterized by the above-mentioned. The absorbent article as set forth in any one of claims 2, 3, and 5, wherein the shallow concave portion is formed at the non-skin contact side of the absorbent body.

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