KR101389693B1 - Absorbent articles - Google Patents

Abstract

The sanitary napkin 1 of the present invention has an absorbent body 4 interposed between the front sheet 2, the back sheet 3, and both sheets, and is substantially vertically long, and the absorbent body 4 is one The upper absorber 41 is formed by being stacked on the lower absorber 42, and the upper absorber 41 is formed by a plurality of deep recesses 5, 5... At least in the center of the upper absorber 41. The lower layer absorber 42 is integrated with the junction.

Sanitary Napkin, Panty Liner, Diffuse, Fit

Description

Absorbent article {ABSORBENT ARTICLES}

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

Background Art Conventionally, in absorbent articles such as sanitary napkins, it is known to protrude the absorber from the center portion or the center portion to the buttocks in order to improve the adhesion to the body and the leakage preventing property. An absorbent article of this kind is intended to prevent the formation of a gap between the skin contact surface and the wearer's skin, thereby reducing the leakage of body fluids through the skin contact surface of the absorbent article or the wearer's skin. In this type of absorbent article, the absorbent body has a middle portion, and the adhesiveness of the skin contact surface and the excretory portion of the absorbent article is increased when worn.

The middle part of the absorber may be formed by laminating 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 opposite to the liquid excretion portion of the wearer.

For example, Japanese Laid-Open 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 Laid-Open Patent Publication No. 2003-33397 discloses a sanitary napkin having an absorbent body in which the middle and high parts 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 longitudinally long. The absorber is formed by stacking 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 absorber by a plurality of deep recesses at least in the center of the upper absorber. The deep concave portion is not formed in the back sheet, and 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. The bottom part is located in the upper absorber.

In the absorbent article, the lower absorbent body is formed with a plurality of shallow recesses except for a portion in which the upper absorber is stacked, and the lower absorbent body 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 embossed groove extended in the said longitudinal direction is formed in the outer side, and the said surface sheet | seat and the said lower layer absorber are integrally joined by this embossing 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, there is a case where the body fluid excreted in the middle and high parts does not move quickly from the skin contact surface side to the non-skin contact surface side, in which case it is difficult to obtain a dry feeling when wearing a napkin.

In the middle and high parts, even if the excreted body fluid moves quickly from the skin contact surface side to the non-skin contact surface 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, so that the liquid of the entire absorber Absorption retention performance may not be fully exhibited.

Accordingly, the present invention relates to an absorbent article having a multi-layer absorbent body, in which liquid is rapidly moved from the skin contact surface side to the non-skin contact surface side, the liquid diffusion property in the absorbent body is good, and the mounting feeling is excellent.

According to the absorbent article having the absorber composed of the multilayer of the present invention, the liquid is rapidly moved from the skin contact surface side to the non-skin contact surface side, the liquid diffusion property in the absorbent body is excellent, and the mounting 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 the present embodiment is a sanitary napkin, and as shown in FIGS. 1 to 5, between the liquid permeable surface sheet 2, the breathable and liquid impervious back sheet 3, and both sheets. The liquid-retaining absorbent body 4 interposed is provided, and is substantially long vertically.

The absorbent body 4 in the sanitary napkin of the present embodiment (hereinafter also referred to simply as a napkin) 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 at the center of the upper absorber 41.

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

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

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 in the center in the width direction) facing the liquid liquid discharging portion of the wearer. It is divided into the rear part C.

Each of the front sheet 2 and the back sheet 3 is vertically long, 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 a skin contact surface in contact with the wearer's skin when the napkin is worn.

The absorber 4 is vertically long and its longitudinal direction coincides with the napkin 1. As shown in FIG. 2, the absorber 4 is wrapped in the base 9 (base sheet), and is pinched | interposed 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 extends from each of the longitudinal front and rear ends of the absorber 4, and is joined to each other by a known joining method such as a heat seal at the extended portion to form an end seal portion. In addition, each of the front sheet 2 and the back sheet 3 extends from each of the both ends in the width direction of the absorber 4 and is similarly joined.

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 is vertically long, 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 absorber 42 is smaller than the napkin 1 and is approximately the same shape. The upper and upper absorbers 41 are formed to have a length and a width smaller than those of the lower absorbers 42, 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. In detail, the upper absorber 41 is disposed at the center of the width direction of the napkin 1 (hereinafter, simply referred to as the napkin width direction) in the excretion facing portion B, and the upper absorber 41 Each of the front and rear ends of) extends to each of the front portion (A) and the rear portion (C). That is, the upper absorbent body 41 extends from the front portion A to the rear portion C after passing through the excretory portion opposing portion B. The upper absorber 41 is a portion that receives the body fluid that has passed through the surface sheet 2 while facing the liquid excretion portion of the wearer when the napkin is worn.

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 circumferential edge thereof. The deep concave portion 5 is circular in plan view, is formed discretely discontinuously, and is formed in a batch lattice-like arrangement pattern as a whole. In the present embodiment, each of the deep recesses 5, 5... Is embossed.

As shown in FIG. 2, each of the deep recesses 5, 5... Is not formed in the back sheet 3, and the skin contacting surface side of the upper absorbent body 41 is disposed on the non-skin-contacting surface side of the lower absorber 42. It is formed concave toward, and the lower layer absorber 42 penetrates in the thickness direction, and the bottom part (the part which is the deepest part in the deep recess 5) is located in the upper layer absorber 41. That is, each of the deep recesses 5, 5... Is formed by recessing only the absorber 4 (the upper absorber 41 and the lower absorber 42), and the upper absorber on the non-skin contact surface side of the lower absorber 42. It is formed insane inside 41. In the deep concave portion 5, a part of the fibers constituting the lower absorbent body 42 is integrally consolidated with the fibers constituting the upper absorbent body 41 in a state of entering the upper absorbent body 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.

As described above, the bottom portion of each of the deep recesses 5, 5... Is located in the upper absorber 41, and each of the deep recesses 5, 5... Penetrates the upper absorber 41 in the thickness direction thereof. I'm not doing it. The bottom portion of each of the deep recesses 5, 5... Is 10 to the thickness of the upper absorbent body 41 from the skin contact surface (the skin contact surface of the absorber 4) of the upper absorbent body 41 (to the non-skin contact surface side). It is preferable to be at a position separated by a distance equivalent to 80%, and more preferably to be at a position separated by a distance equivalent to 20 to 50% of the thickness. The bottom portion of each of the deep recesses 5, 5... Is in this position, thereby making the upper and lower absorbers 42 and the lower absorbers 42 extremely hardened, and the lower absorbers 42 also become upper absorbers. It can be effectively incorporated in 41, so that these two layers 41 and 42 can be consolidated more integrally.

The deep concave portion 5 of each of the upper absorber 41 and the lower absorber 42 is formed to have a high density of fibers constituting the absorber. The deep concave portion 5 has a higher capillary force due to consolidation, and serves as a coating liquid passage where liquid flows from the upper absorber 41 to the lower absorber 42, and the upper absorber 41 The diffusivity in the planar direction of the liquid in) is also increased 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 part where the deep recessed part 5 is formed" is the area | region located between the bottom part of the deep recessed part 5, and the skin contact surface (skin contact surface of the absorber 4) of the upper absorber 41. As shown in FIG. Means density.

On the other hand, the density of the part other than the "part in which the deep recessed part 5 is formed" in the absorber 4 is smaller than the "part in which the deep recessed part 5 is formed", Preferably it is 0.01-0.4 g / m <^3> , More preferably, it is 0.02-0.2g / m <^3> .

The said density (density of a predetermined site | part of an absorber) is calculated | required as follows. That is, the absorber having previously measured the basis weight is cut in the thickness direction of the absorber at the desired density measurement site, and the cut surface is observed under a microscope (electron microscope VH-8000 manufactured by Keyence) to measure the thickness of the desired target site. The density of the said site | part is computed from this thickness measurement value and the 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 cut 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 the laminate is then embossed on the circumferential surface so that the non-skin contact surface is embossed. The convex portion is sent to an embossing apparatus having an embossing roll arranged regularly and an anvil roll disposed opposite thereto for embossing. In this embossing, it is preferable to adjust the distance between the embossing roll and the anvil roll, the height of the embossing convex portion, and the like so that the embossing convex portion extends to the inside of the upper absorbent body 41.

As shown in Figs. 2 and 3, the lower absorber 42 excludes a portion where the upper absorber 41 is stacked and a region Q having a predetermined width outside the entire circumferential edge of the upper absorber 41. In addition, many shallow concave portions 6, 6... Are formed. In FIG. 4, the area | region R in which the shallow recessed part 6,6 ... was formed in the lower absorber is shown by oblique line. In FIG. 4, the region Q is a portion sandwiched between the portion in which the upper absorber 41 is stacked and the region R in which the shallow concave portions 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 recess 5 and the "shallow" of the shallow recess 6 have a meaning which distinguishes the depth of a recess relatively. 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, and the shallow concave portion 6 is formed only in the lower absorber 42. .

The shallow concave portion 6 is circular in a planar view, discretely discontinuously formed, and is formed in an arrangement pattern of a grating shape as a whole. In the present embodiment, the shallow concave portions 6 are arranged so that the distance between the shallow concave portions 6 is smaller than the distance between the deep concave portions 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 providing such a capillary force gradient, the method of increasing the area of each recessed part and increasing the ratio of the recessed part in the absorber 41 may be used.

As shown in Fig. 2, the shallow concave portions 6, 6 ... are formed to affect the inside of the lower layer absorber 42 on the non-skin-contacting surface side of the lower layer absorber 42. As shown in FIG. Each of the shallow concave portions 6, 6 ... forms a concave portion on the non-skin-contacting surface side of the lower layer absorbent body 42. In the portion where the shallow concave portion 6 of the lower layer absorbent body 42 is formed, the fibers constituting the absorbent body are compacted to have a high density, and the capillary force is increased. In addition, each of the deep recesses 5, 5... Is deeper than each of the shallow recesses 6, 6.

The absorber 4 which has many shallow recesses 6 and 6, and has many deep recesses 5 and 5 ... can be produced as follows, for example. An absorbent body 4 having a plurality of deep recesses 5, 5..., An embossing roll having regular embossed convex portions on the circumferential surface thereof, and an anvil disposed thereon so that the non-skin-contacting surface side is subjected to embossing. Embossing is sent to an embossing device equipped with a roll. In this embossing process, it is preferable to provide the area | region in which the embossed convex part does not exist in an embossing roll so that the embossed convex part may extend only in the lower layer absorber 42 inside. Moreover, it is also preferable to adjust the space | interval of embossing roll and anvil roll, the height of the embossing convex part, 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 are formed in the laminate. , 5 ...) may be formed.

Moreover, the embossing roll side (skin contact surface side in FIG. 2) in the absorber 4 of the part in which the deep recessed part 5 or the shallow recessed part 6 is formed is the anvil roll side (non-skin contact surface in FIG. 2). Side) may be missing. This is thought to be due to the movement of the fibers constituting the skin contact surface side of the absorber 4 toward the non-skin contact surface side in order to stabilize the state where each of the embossed portions is formed, and the effect of consolidation is not processed. Since it extends to the surface side, it has a coating liquid effect.

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

The lower layer absorber 42 has a pair of embossed grooves 7 and 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 a 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 embossing groove 7 is formed.

As shown in FIG. 3, 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 of the napkin 1 in the longitudinal direction of the napkin 1. The convexly curved portion 7b positioned at the center of the excretion portion facing area (central portion in the napkin width direction of the excretion portion facing portion B) of the napkin 1 It is located outside the napkin width direction. The part 7b is located outside the side edge portion 41a in the longitudinal direction in the upper absorber 41 in the excrement facing part B. As shown in FIG.

More specifically, 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 longitudinal direction. That is, the lower layer absorber 42 is formed with a closed annular embossed groove including a pair of embossed grooves 7, 7.

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

The portion of the annular embossed groove has a high rigidity because the fibers constituting the lower absorber 42 are consolidated and have a higher density. Moreover, it has a convex shape and annular shape toward the outer side of a napkin longitudinal direction. Therefore, the part of the lower layer absorber 42 inside this annular embossing groove has high planar shape stability, and generation | occurrence | production of the wrinkle and distortion with some unevenness is suppressed. Furthermore, since the upper absorber 41 is joined to the upper portion of the lower absorber 42 inside the annular embossing groove, the upper absorber 41 and the lower absorber 42 have a deep concave portion 5. ) And the grooves are used to increase stably through use.

Therefore, the body fluid absorbed by the upper absorbent body 41 quickly moves to the lower absorbent body 42 integrated with the upper absorbent body 41 with high adhesion, 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 than the upper absorber in the vicinity of the deep recessed part 5. There is a tendency to be formed slightly higher than the density of 41), and the effect of plating on the lower absorbent 42 becomes higher.

The body fluid absorbed and retained in the central portion of the absorbent body 4 is condensed in the region Q, and the inside of the lower layer absorbent body 42 is directed toward the outside of the absorbent body 4 through the annular embossing groove having a high maternal force. Move to area R. In addition, since the body fluid moved to the region R is further diffused toward the outside of the lower absorber 42 through the plurality of shallow recesses 6, 6, the absorbent performance of the lower absorber 42 is effectively used. do. As a result, a good state in which the body fluid rapidly moves from the upper absorber 41 to the lower absorber 42 is maintained.

 In addition, since the grooves have a convex shape that bulges outwardly in the excrement facing region B, the diffusion in the lateral direction of the liquid reaching the grooves is smooth at the center thereof, and the density becomes high when the liquid contacts the grooves. Diffusion in the longitudinal direction of the recessed grooves 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, and the diffusion in the longitudinal direction of the groove is superior, and the arrival of the liquid to the shallow concave portion 6 compared to the center portion is Slows down That is, the positional relationship of the grooves in the region Q is changed, and the grooves are close to the shallow concave portions 6 in the center of the excretion portion opposing regions B, and the deep concave portions before and after the excretion portion opposing regions B. Close to 5). For this reason, not only the liquid retention property at the center portion is high but also problems such as liquid backflow can be suppressed, and further, leakage in the lateral direction and the inclined direction can be suppressed.

When the amount of body fluid excreted is large, a part of the body fluid excreted on the surface sheet 2 may be directly absorbed into the lower layer absorber 42 through the annular embossing 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 are also appropriately designed according to the size of the napkin 1 and its specific use. It is preferable to be.

For example, when the napkin 1 is used for a large amount of menstrual blood or for a 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 center distance) 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.

It is preferable that the diameter of the shallow recessed part 6 is 0.8-4 mm, especially 1-3 mm. Moreover, it is preferable that the distance (for example, center distance) between the shallow recesses 6 is 2-10 mm, especially 3-7 mm in the napkin longitudinal direction, 2-10 mm, especially 3-7 mm in the 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 absorber 42 is viewed in plan, the width of the area Q outside the entire circumferential edge in the upper absorber 41 is preferably 5 to 15 mm, particularly 7 to 12 mm. As long as the said width | variety of the area | region Q is in the said range, it may be constant or may change.

Furthermore, it is preferable that the width of the embossed groove 7 is 0.5-4 mm, especially 0.8-2 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. For example, as shown in Figs. 5A and 5B, a plurality of protrusions 24 protruding to the skin contact surface side are shown. It is preferable to use an uneven sheet having a.

In this embodiment, the surface sheet 2 which consists of an uneven | corrugated sheet 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 forms a plurality of convex portions 24 having compressive elasticity at portions other than the heat-sealed portion 23.

The uneven sheet is formed by heat-embossing the first fibrous layer 21 and the second fibrous layer 22 made of fiber aggregates in a predetermined pattern by thermal embossing, and then the second fibrous layer 22 in a horizontal direction. It is obtained by thermal contraction with. In detail, the thermal fusion by heat embossing, for example, the embossed surface (circumferential surface of the embossing roll, etc.) where a plurality of embossing pins are arranged regularly, the first fiber layer 21 and the second fiber layer 22 The first fiber layer 21 in the laminate is pressed against the first fiber layer 21 to melt the constituent fibers of the first fiber layer 21 and / or the second fiber layer 22 at the site of heat pressing on each pin. Is carried out.

For example, the heat shrink of the second fiber layer 22 includes the second fiber layer 22 made of heat-shrinkable fiber or the heat-shrinkable fiber in the second fiber layer 22, and the first fiber layer 21 and the second fiber layer 22. The heat treatment is performed by heating the second fiber layer 22 at the same time as the fiber layer 22 is thermally fused or both are thermally fused. 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 zigzag shape while being scattered. The distance between the heat welding 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 do not have substantially 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 composed 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 crimping 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 crimping 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 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 composite fiber composed of two kinds of thermoplastic polymer materials having different shrinkage rates. As an example, the thing of Unexamined-Japanese-Patent No. 9-296325 and the Japan Patent No. 2759331 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 crimps of the fibers are expressed to shrink by heating. Can be.

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 liquid moves from a skin contact surface side to a non-skin contact surface 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 menstrual blood is large or when it is used for long time use such as at night.

The absorbent article of the present invention is not limited to the above-described embodiments, 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 absorbers may be laminated in the thickness direction of the absorbent article, and each of the plurality of upper 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 wrapped in the board | substrate 9 in the state in which the upper layer absorber 41 was laminated | stacked on the lower layer absorber 42, from the viewpoint of the workability of the napkin 1, the upper layer is upper layer. Each of the absorber 41 and the lower layer absorber 42 may be wrapped with earth.

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

The absorbent article of the present invention may be a sanitary napkin, but may also 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 illustrating an embossed groove of the sanitary napkin of FIG. 1.

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 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, and is formed concavely from the non-skin contact surface side of the lower layer absorber toward the skin contact surface side of the upper absorber, and further penetrates the lower layer absorber in the thickness direction thereof. Thus, the bottom portion is located in the upper absorber, The lower absorber is formed with a plurality of shallow concave portions except for the portion where the upper absorber is stacked, The lower layer absorber has embossed grooves extending in the longitudinal direction on the outer side of each of the longitudinal edges of the absorbent article in the upper absorber, and the surface sheet and the lower layer absorber are formed by the embossed grooves. An absorbent article, which is integrally bonded together. delete The absorbent article as set forth in claim 1, wherein said shallow recess is not formed in a region where said embossed groove is formed. The absorbent article according to claim 1 or 3, wherein the upper absorber has one longitudinally longer upper absorber, and the upper absorber is laminated to a central portion of the lower absorber. The said embossed groove is a part which convexly curved toward the outer side in the width direction in the said absorbent article has the shape which continued one or more in the said longitudinal direction of the said absorbent article, and is convexly curved The said absorbent article is located in the outer side of the excretion part opposing area | region in the said absorbent article. The absorbent article according to claim 1 or 3, wherein the shallow recess is formed on the non-skin-contacting surface side of the absorber.

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