TWI411428B - Absorbent items - Google Patents

Abstract

The feminine napkin (1) of the invention is provided with a front side sheet (2), a back side sheet (3) and an absorbing body (4) arranged between the two sheets, and is in long shape. Wherein, the absorbing body (4) is formed by cascading an upper layer absorbing body (41) on a lower layer absorbing body (42), and the upper layer absorbing body (41) is integrated with the lower layer absorbing body (42) at least at the central part of the upper layer absorbing body (41) via a plurality of deep convex parts (5, 5......).

Description

Absorbent article

The present invention relates to an absorbent article, and more particularly to an absorbent article such as a sanitary napkin or an incontinence pad.

In the absorbent article such as sanitary napkin, it is known that the absorbent body protrudes from the center portion or from the center portion to the buttocks in order to improve the adhesion to the body or the leakproof property. The purpose of such an absorbent article is to prevent 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. Further, in such an absorbent article, the absorbent body has a middle-high portion, and the adhesion between the skin contact surface and the excretion portion of the absorbent article during wear is improved.

The upper part of the absorber is formed, for example, by laminating an upper layer absorber on the lower layer absorber. Further, there is a case where the thickness of the absorber is increased only in the central portion thereof, and the absorber having the middle-high portion is integrally formed. In either case, the middle and high portions are the portions where the body fluid is directly excreted, and the surface is placed at the position of the body fluid excretion portion of the wearer, so that the thickness of the absorber is thicker than other portions.

For example, Japanese Laid-Open Patent Publication No. Hei 5-24025 discloses a sanitary napkin in which an upper absorbent body is formed on a lower absorbent body. Further, Japanese Laid-Open Patent Publication No. 2003-33397 discloses a sanitary napkin having an absorbent body integrally forming a middle-high portion.

The absorbent article of the present invention comprises a front sheet, a back sheet, and an absorbent body sandwiched between the sheets, and is actually vertically long. The above absorption system is formed by one or a plurality of upper absorbent layer layers on the skin contact surface of the lower absorbent body. One or a plurality of the above-mentioned upper layer absorbers are joined to the lower layer absorber by a plurality of deep recesses at least in the central portion of the upper layer absorber. The deep recessed portion is not formed on the back sheet, but is formed to be recessed toward the skin contact surface side of the upper layer absorber from the non-skin contact surface side of the lower layer absorber, and penetrates the lower layer absorber in the thickness direction. The bottom is located in the upper absorbent body.

In the above absorbent article, it is preferable that the lower absorbent body has a plurality of shallow recesses formed in a portion other than the portion in which the upper absorbent core is laminated, and the lower absorbent system is in the absorbent article of the upper absorbent core. The embossing grooves extending in the longitudinal direction are formed on the outer sides of the both side edges in the longitudinal direction, and the front sheet and the lower layer absorber are joined to each other by the embossing grooves.

As described above, the sanitary napkin has a middle-high portion, so that the body fluid absorption and retention performance of the central portion is higher than that of other portions. However, since the middle and high sections are formed by increasing the thickness of the absorber, the body fluid absorption and retention performance of the entire thickness direction of the absorber is not sufficiently exhibited. For example, in the case where the body fluid excreted to the middle and high portions does not rapidly move from the skin contact surface side to the non-skin contact surface side, in this case, it is difficult to obtain a dry feeling when the sanitary napkin is worn.

Further, in the middle and high portions, even if the excreted body fluid rapidly moves from the skin contact surface side to the non-skin contact surface side, the body fluid absorbed into the central portion of the absorber body does not sufficiently diffuse toward the outside of the absorber body, so that it exists. The body fluid absorption and retention performance of the entire absorbent body is not fully exerted.

Therefore, the present invention relates to an absorbent article which has an absorbent body composed of a plurality of layers, and the body fluid can be rapidly moved from the skin contact surface side to the non-skin contact surface side, and the body fluid diffusing property in the absorbent body is good, and the wearing feeling is excellent.

According to the absorbent article of the present invention having the absorbent body composed of a plurality of layers, the body fluid can be quickly moved from the skin contact surface side to the non-skin contact surface side, and the body fluid diffusibility in the absorbent body is good, and the wearing feeling is excellent.

Hereinafter, the absorbent article of the present invention will be described with reference to the drawings based on preferred embodiments.

The absorbent article 1 of the present embodiment is a sanitary napkin, and as shown in FIGS. 1 to 5, a liquid-permeable front sheet 2, a back sheet 3 having air permeability and liquid impermeability, and a sheet sandwiched between the sheets are sandwiched between the sheets. The liquid-retaining absorbent body 4 is actually longitudinally long.

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

Further, in the lower absorbent core 42 of the sanitary napkin 1 of the present embodiment, in addition to the portion in which the upper absorbent core 41 is laminated, a plurality of shallow recesses 6, 6 are formed in other portions, and the lower absorbent core 42 is absorbed in the upper layer. The outer side of each of the side edges 41a and 41a of the longitudinal direction of the sanitary napkin 1 of the body 41 (hereinafter, also referred to simply as the longitudinal direction of the sanitary napkin) is formed with an embossing groove 7 extending in the longitudinal direction by the embossing In the groove 7, the front sheet 2 and the lower layer absorber 42 are joined to be integrated.

The sanitary napkin 1 of the present embodiment will be further described below.

The sanitary napkin 1 is divided into a front portion A in the longitudinal direction thereof and an excretion portion opposing portion B as a central portion in the longitudinal direction (the portion in the center in the width direction having the excretion portion facing the body fluid excretion portion of the wearer) ) and the rear part C.

The front sheet 2 and the back sheet 3 are each vertically long, and the longitudinal direction thereof coincides with the longitudinal direction of the napkin 1 (hereinafter, simply referred to as the tampon length direction). The front sheet 2 is formed with a skin contact surface that comes into contact with the wearer's skin when the sanitary napkin is worn.

The absorbent body 4 is vertically long, and its longitudinal direction coincides with the sanitary napkin 1. As shown in FIG. 2, the absorber 4 is sandwiched and fixed between the front sheet 2 and the back sheet 3 in a state covered with the backing paper 9.

Further, the front sheet 2 and the back sheet 3 are respectively extended from the respective ends of the front and rear ends of the absorbent body 4 in the longitudinal direction, and the extended portions are joined to each other by a known joining method such as heat sealing to form an end seal portion. Further, the front sheet 2 and the back sheet 3 are respectively extended from the respective ends of the absorbent body 4 in the width direction, and joined in the same manner.

The absorbent body 4 will be further described below.

As shown in FIGS. 1 and 2, the absorber 4 has a laminated structure of an upper layer absorber 41 and a lower layer absorber 42. The upper layer absorber 41 and the lower layer absorber 42 are each vertically long, and the longitudinal direction thereof coincides with the longitudinal direction of the sanitary napkin. Preferably, the upper layer absorber 41 and the lower layer absorber 42 are each formed of pulp fibers or the like.

The lower absorbent body 42 is smaller than the sanitary napkin 1, and has almost the same shape. The size of the upper absorbent body 41 is formed such that the length and the width are smaller than the lower absorbent body 42, respectively. The upper layer absorber 41 is laminated on the skin contact surface side (body side) in the central portion of the lower layer absorber 42 to form a high portion of the absorber 4. Specifically, the upper layer absorber 41 is disposed at a central portion in the width direction of the sanitary napkin 1 of the excretory portion facing portion B (hereinafter, simply referred to as the tampon width direction), and the front end portion of the upper layer absorbent body 41 is respectively Each of the front portion A and the rear portion C extends. That is, the upper layer absorber 41 extends from the front portion A to the rear portion C through the drain portion facing portion B. The upper absorbent body 41 is opposed to the body fluid excretion portion of the wearer when the sanitary napkin is worn, and is a portion that receives the body fluid that has passed through the front sheet 2.

The upper layer absorber 41 is joined to the lower layer absorber 42 by a plurality of deep recesses 5, 5, .... In the present embodiment, the upper layer absorber 41 is integrated with the lower layer absorber 42 by the deep recesses 5, 5, ... between the central portion and the entire circumference. The deep recessed portion 5 is formed in a circular shape in a plan view, and is formed in a discrete discontinuous manner, and is formed in a zigzag lattice-like arrangement pattern as a whole. In the present embodiment, the deep recesses 5, 5, ... are each formed by embossing.

As shown in FIG. 2, the deep recesses 5, 5, ... are not formed on the back sheet 3, but are formed to be recessed toward the skin contact surface side of the upper layer absorber 41 from the non-skin contact surface side of the lower layer absorber 42, respectively. The lower layer absorber 42 is penetrated in the thickness direction, and the bottom portion (the deepest portion of the deep recess portion 5) is located in the upper layer absorber 41. In other words, the deep recesses 5, 5, ... are formed by recessing only the absorber 4 (the upper layer absorber 41 and the lower layer absorber 42), and are extended from the non-skin contact surface side of the lower layer absorber 42 to the inside of the upper layer absorber 41. The way is formed. In the deep recessed portion 5, a part of the fibers constituting the lower layer absorbent body 42 is integrated into the upper layer absorbent body 41, and is integrally pressed with the fibers constituting the upper layer absorbent body 41.

The upper layer absorber 41 and the lower layer absorber 42 are joined by a plurality of deep recesses 5, 5, ... and are integrated in a sealed state.

The bottom portions of the deep recesses 5, 5, ... are located in the upper layer absorber 41 as described above, and the deep recesses 5, 5, ... are not penetrated by the upper layer absorber 41 in the thickness direction. Preferably, the bottom portion of each of the deep recessed portions 5, 5, ... is located on the skin contact surface (the skin contact surface of the absorbent body 4) from the upper absorbent core 41, and is separated from the lower layer (non-skin contact surface side) corresponding to the upper absorbent body 41. At a distance of 10 to 80% of the thickness, it is more preferable to be at a distance of 20 to 50% of the thickness. By positioning the bottom portions of the deep recessed portions 5, 5, ... at such a position, the upper layer absorber 41 and the lower layer absorber 42 can be prevented from being extremely hardened excessively, and the lower layer absorber 42 can be efficiently entered into the upper layer absorber 41, The two layers 41, 42 are further integrally densified.

In the portion where the deep recessed portion 5 is formed in each of the upper layer absorber 41 and the lower layer absorber 42, the fibers constituting each of the absorbers are densified and the density is increased. Since the deep recessed portion 5 is increased in capillary force by the densification, the liquid guiding action of introducing the liquid from the upper layer absorber 41 into the lower layer absorber 42 is exerted, and at the same time, the diffusion in the liquid plane direction in the upper layer absorber 41 is also enhanced. Sex.

The density of the portion in which the deep recessed portion 5 is formed is preferably 0.2 to 1.2 g/m ^{3 from} the viewpoint of preventing the upper layer absorber 41 and the lower layer absorber 42 from being excessively hardened and effectively imparting capillary force to the two layers 41 and 42. More preferably, it is 0.35~0.6 g/m ³ . Here, the "density of the portion in which the deep recessed portion 5 is formed" means the density of the region between the bottom portion of the deep recessed portion 5 and the skin contact surface of the upper layer absorbent body 41 (the skin contact surface of the absorbent body 4).

On the other hand, the density of the portion of the absorber 4 other than the "portion in which the deep recess portion 5 is formed" is smaller than the "portion in which the deep recess portion 5 is formed", preferably 0.01 to 0.4 g/m ³ , more preferably It is 0.02~0.2 g/m ³ .

The above density (specific portion density of the absorber) was obtained in the following manner. In other words, the absorber having a basis weight is measured in advance, and the portion where the density is desired to be measured is cut in the thickness direction of the absorber, and the cut surface is observed by a microscope (Digital Microscope VH-8000 manufactured by Keyence), and the desired surface is measured. The thickness of the measurement site was calculated from the measured value of the thickness and the basis weight of the absorber. From the viewpoint of keeping the structure of the cut surface and the absorbent body in the vicinity thereof as close as possible before cutting, it is preferable to use a sharp cutter for cutting the absorbent body (for example, FEATHER SAFETY RAZOR) FAS-10) manufactured by the company.

The absorber 4 having a plurality of deep recesses 5, 5, ... can be produced, for example, in the following manner. First, the upper layer absorber 41 is laminated on the lower layer absorber 42 (skin contact surface) to form a layered body, and then the layered body is sent to the circumference so that the non-skin contact surface side is subjected to embossing. The embossing roll in which the embossing roller for the embossing convex portion and the supporting roller disposed opposite thereto are regularly arranged, and embossing is performed. In the embossing, it is preferable to adjust the interval between the embossing roll and the backup roll, the height of the embossing convex portion, and the like so that the embossing convex portion reaches the inside of the upper layer absorbent body 41.

Further, as shown in FIG. 2 and FIG. 3, the lower layer absorber 42 has a plurality of shallow portions other than the region Q in which the upper layer absorber 41 is laminated and the outer width of the outer layer of the upper layer absorber 41. Concave portions 6, 6, .... In Fig. 4, a region R in which the lower layer absorber is formed with the shallow recesses 6, 6, ... is indicated by oblique lines. In Fig. 4, the region Q is sandwiched between a portion where the upper layer absorber 41 is laminated and a portion where the shallow recess portions 6, 6 are formed. In the present embodiment, the shallow recesses 6, 6, ... are each formed by embossing.

In the present specification, the "deep" of the deep recessed portion 5 and the "shallow" of the shallow recessed portion 6 respectively have the meaning of relatively different depths of the recessed portion. More specifically, in the present embodiment, the deep recessed portion 5 is formed such that the upper layer absorber 41 and the lower layer absorber 42 are joined to each other, and the shallow recessed portion 6 is formed only in the lower layer absorber 42.

The shallow recessed portion 6 is formed in a circular shape in a plan view, and is formed in a discrete discontinuous manner, and integrally forms a zigzag lattice-like arrangement pattern. In the present embodiment, the shallow recessed portion 6 is disposed such that the distance between the shallow recessed portions 6 is smaller than the distance between the deep recessed portions 5. This is because the capillary force gradient is applied between the region of the deep recess and the region of the shallow recess to promote the liquid to move further outward. As another method of imparting such a capillary force gradient, a method of increasing the area of each concave portion and increasing the ratio of the concave portion of the absorbent body 4 can be used.

As shown in Fig. 2, the shallow recesses 6, 6, ... are formed so as to reach the inside of the lower layer absorber 42 from the non-skin contact surface side of the lower layer absorber 42. The shallow recesses 6, 6, ... form recesses on the non-skin contact surface side of the lower layer absorber 42, respectively. The lower absorbent body 42 is formed with a shallow recessed portion 6, and the fibers constituting the absorbent body are densified, the density is increased, and the capillary force is increased. Further, each of the deep recessed portions 5, 5, ... is formed deeper than each of the shallow recessed portions 6, 6, ....

The absorber 4 having a plurality of shallow recesses 6, 6, ... and having a plurality of deep recesses 5, 5, ... can be produced, for example, as follows. The absorbing body 4 in which the plurality of deep recessed portions 5, 5, ... are formed, and is embossed on the non-skin contact surface side, and is sent to an embossing roll having a embossing convex portion regularly disposed on the circumferential surface thereof and An embossing process is performed on the embossing device of the support rolls arranged in the opposite direction. In the embossing, it is preferable to provide a region where the embossing convex portion is not present on the embossing roller so that the embossing convex portion reaches only the inside of the lower absorbent body 42. Further, it is also preferable to adjust the interval between the embossing roller and the backup roller, the height of the convex portion for embossing, and the like. Further, after the lower layer absorbers 42 are formed with a plurality of shallow recesses 6, 6, ..., the upper layer absorber 41 and the lower layer absorber 42 may be laminated, and a plurality of deep recesses 5, 5, ... may be formed in the laminate.

Further, there is also a case where the embossing roll side of the absorber 4 in which the deep recessed portion 5 or the shallow recessed portion 6 is formed (the skin contact surface side in the case of Fig. 2) is also provided from the support roller side ( In the case of Fig. 2, it is a non-skin contact side) depression. The reason for this is that the fibers constituting the skin contact surface side of the absorbent body 4 are moved to the non-skin contact surface side in order to stabilize the state in which each of the embossed portions is formed, and the pressure is also changed to the non-skin contact surface. The surface of the processing surface has an influence, so it has a liquid guiding effect.

Next, the embossing groove 7 will be further described below.

On the lower absorbent body 42, a pair of embossing grooves 7, 7 are formed on both sides of the upper absorbent body 41. As shown in FIGS. 2 and 4, a pair of embossing grooves 7, 7 are formed in a region Q in which the shallow recessed portion 6 is not formed. That is, in the region Q in which the embossing groove 7 is formed, the shallow recessed portion 6 is not formed.

As shown in Fig. 3, each of the pair of embossing grooves 7, 7 has a shape in which the portions 7a, 7b, 7c which are convexly convex toward the outer side in the width direction of the sanitary napkin 1 are three in the longitudinal direction of the sanitary napkin 1. The portion 7b which is curved in a convex shape in the center is located on the outer side in the width direction of the tampon in the opposing portion of the excretion portion of the sanitary napkin 1 (the central portion in the width direction of the tamping portion of the excretion portion facing portion B). The portion 7b is located on the outer side of the both side edges 41a in the longitudinal direction of the upper layer absorbent body 41 in the excretion portion opposing portion B.

More specifically, the front end portions of the pair of embossed grooves 7 and 7 in the longitudinal direction are connected by embossing grooves extending in the width direction of the tampon. The embossing groove extending in the width direction of the tampon has a convex shape toward the outer side in the longitudinal direction of the tampon. That is, a closed annular embossing groove including a pair of embossing grooves 7, 7 is formed on the lower layer absorbent body 42.

Moreover, the front sheet 2 is joined to the lower layer absorber 42 by the above-mentioned annular embossing groove.

In the portion of the annular embossing groove, the fibers constituting the lower layer absorbent body 42 are densified, and the density is increased, so that the rigidity is improved. Further, it has a convex shape and an annular shape toward the outer side in the longitudinal direction of the sanitary napkin. Therefore, the portion of the lower layer absorber 42 inside the annular embossing groove has a high surface shape stability, and can suppress the occurrence of pleats or wrinkles having a plurality of irregularities. Further, the upper layer absorber 41 is bonded to a portion of the lower layer absorber 42 inside the annular embossing groove, so that the upper layer absorber 41 and the lower layer absorber 42 are one-piece, and the deep recess 5 is joined to the groove by the deep recess 5. And it is steadily improved throughout the use.

Therefore, the body fluid absorbed in the upper layer absorber 41 is rapidly moved to the upper layer absorber 42 in a state of being densely integrated with the upper layer absorber 41, and is first absorbed and held in the central portion of the absorber 4. At this time, the body fluid is mainly moved by the deep recesses 5, 5, ... as the liquid guiding paths. Further, as shown in FIG. 2 or FIG. 4, since the deep recessed portion 5 is formed from the lower layer absorber 42 side, the density of the lower layer absorber 42 is slightly higher than the density of the upper layer absorber 41 around the deep recessed portion 5. Thereby, the liquid guiding effect of the lower layer absorber 42 is further improved.

The body fluid that is held in the central portion of the absorber 4 is in the region Q, and the annular embossing groove having a high capillary force through the densification is directed toward the outside of the absorber 4 and inside the lower layer absorber 42. The above region R moves. Further, the body fluid that has moved to the region R is further diffused toward the outside of the lower layer absorber 42 by the plurality of shallow recesses 6, 6, ..., so that the absorption performance of the lower layer absorber 42 can be used efficiently. As a result, it is possible to maintain a good state in which the body fluid rapidly moves from the upper layer absorber 41 to the lower layer absorber 42.

Further, since the groove is formed in a convex shape that expands outward in the opposing portion B of the drain portion, the diffusion of the liquid reaching the groove toward the side portion is slow in the center thereof, and the groove becomes higher in density when the liquid contacts the groove. Dispersing in the length direction and holding the liquid by the shallow recess 6. diffusion. On the other hand, in the front or rear portion of the excretion portion facing region B, the diffusion into the groove occurs earlier, and the diffusion in the longitudinal direction of the groove takes precedence, and the liquid reaches the shallow concave portion 6 as compared with the central portion. That is, the positional relationship of the groove of the region Q changes, and the groove approaches the shallow recessed portion 6 in the center of the opposing portion B of the drain portion, and approaches the deep recessed portion 5 before and after the draining portion faces the region B. Therefore, not only the liquid retention in the center portion is high, but also problems such as backflow of the liquid can be suppressed, and leakage into the side direction and the oblique direction can be suppressed.

Further, when the amount of bodily fluid to be excreted is large, a part of the body fluid discharged to the front sheet 2 may be directly absorbed into the lower layer absorber 42 through the annular embossing groove.

The size and the like of the sanitary napkin 1 of the present embodiment are preferably appropriately designed according to the specific use thereof. Further, the size of the upper absorbent core 41, the lower absorbent core 42, the deep recessed portion 5, the shallow recessed portion 6, and the embossed groove 7 is preferably appropriately designed in accordance with the size of the sanitary napkin 1 and its specific use.

For example, when the sanitary napkin 1 is used in the case of a large amount of menstrual blood or a long time such as at night, the sanitary napkin 1 is preferably designed in the following manner.

The size of the sanitary napkin 1 is preferably 20 to 50 cm in length, particularly preferably 27 to 50 cm, and the width is 5 to 10 cm, particularly preferably 7 to 10 cm.

The upper absorbent body 41 preferably has a length of 5 to 20 cm, particularly preferably 7 to 17 cm, and a width of 2 to 4.5 cm, particularly preferably 2.5 to 3.5 cm. Further, the basis weight of the upper layer absorber 41 is preferably from 100 to 1000 g/m ² , particularly preferably from 150 to 600 g/m ² .

The size of the lower absorbent body 42 is preferably 15 to 50 cm in length, particularly preferably 25 to 45 cm, and a width of 5 to 10 cm, particularly preferably 7 to 10 cm. Further, the basis weight of the lower absorbent body 42 is preferably from 100 to 600 g/m ² , particularly preferably from 150 to 300 g/m ² .

Further, the diameter of the deep recessed portion 5 is preferably 0.8 to 4 mm, particularly preferably 1 to 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 sanitary napkin, particularly preferably 3 to 7 mm, and preferably 2 to 10 in the width direction of the sanitary napkin. Mm, especially good is 3~7 mm. Further, the depth of the deep recessed portion 5 is preferably 2 to 50%, particularly preferably 10 to 40%, with respect to the thickness of the portion of the absorber 4 having the upper layer absorber 41.

The diameter of the shallow recess 6 is preferably 0.8 to 4 mm, particularly preferably 1 to 3 mm. Further, the distance between the shallow recesses 6 (for example, the distance between the centers) is preferably 2 to 10 mm in the longitudinal direction of the sanitary napkin, particularly preferably 3 to 7 mm, preferably in the width direction of the sanitary napkin. 2~10 mm, especially good 3~7 mm. Further, the depth of the shallow recessed portion 6 is preferably 2 to 50%, particularly preferably 10 to 40%, with respect to the thickness of the lower layer absorber 42.

Further, in the case where the lower layer absorber 42 is viewed in plan, the width of the region Q outside the entire periphery of the upper layer absorber 41 is preferably 5 to 15 mm, particularly preferably 7 to 12 mm. If the width of the region Q is within the above range, it may be fixed or varied.

Further, the width of the embossing groove 7 is preferably 0.5 to 4 mm, particularly preferably 0.8 to 2 mm.

Next, each material forming the sanitary napkin 1 of the present embodiment will be described.

First, the material for forming the front sheet 2 is not particularly limited as long as it is a liquid-permeable sheet. For example, it is preferably used on the skin contact surface side as shown in Figs. 5(a) and 5(b). An uneven sheet of the plurality of convex portions 24 is protruded.

The front sheet 2 composed of the uneven sheet of the present embodiment includes the first fibrous layer 21 on the skin contact surface side and the second fibrous layer 22 on the non-skin contact surface side. The first fiber layer 21 and the second fiber layer 22 are partially thermally fused to form a heat-melting portion 23 as a concave portion. In the first fiber layer 21, a plurality of convex portions 24 having compressive elasticity are formed at portions other than the heat fusion portion 23.

The uneven sheet is obtained by partially melting the first fiber layer 21 and the second fiber layer 22 including the fiber assembly in a specific pattern by hot embossing, and then positioning the second fiber layer 22 in the horizontal direction. Heat shrinkage. Specifically, the heat fusion by hot embossing is performed, for example, by arranging a plurality of embossed embossed surfaces (circumferential surfaces of embossing rolls, etc.) and crimping the first fibers. On the side of the first fiber layer 21 of the layered body of the layer 21 and the second fiber layer 22, the constituent fibers of the first fiber layer 21 and/or the second fiber layer 22 which are hot-pressed by the respective needles are melted.

The heat shrinkage of the second fiber layer 22 is performed, for example, by forming the second fiber layer 22 from heat-shrinkable fibers or by including heat-shrinkable fibers in the second fiber layer 22, and forming the first fiber layer 21 and the first fiber layer 21 When the fiber layer 22 is thermally melted or both are thermally melted, the second fiber layer 22 is heat-treated. The plurality of convex portions 24 are caused by heat-shrinking the second fiber layer 22 in the horizontal direction, and the portion other than the heat-melted portion 23 of the first fiber layer 21 is deformed into a convex shape.

The plurality of heat-melting portions 23 are preferably regularly formed in a scattered shape and have a zigzag shape. The distance between the heat fusion portions 23 is substantially constant.

Each of the convex portions 24 is formed in a dome shape, and the inside thereof is filled with the fibers constituting the first fiber layer 21. Moreover, the interface between the first fiber layer 21 and the second fiber layer 22 in which the convex portions 24 are formed is formed in a state in which it is not joined but adhered.

The constituent fibers of the first fiber layer 21 are preferably those which do not have heat shrinkability or which are not thermally shrinkable at a temperature lower than the heat shrinkage temperature of the constituent fibers of the second fiber layer 22.

The constituent fiber of the second fiber layer 22 preferably contains a thermoplastic polymer material and has heat shrinkability. Further, the constituent fibers are preferably those exhibiting an elastic body after shrinkage. As an example of such a fiber, a latent crimpable fiber is mentioned. The content ratio of the latent crimpable fibers in the second fiber layer 22 is preferably from 40 to 100% by weight. The latent crimping fiber is a fiber which can be treated in the same manner as the previous non-woven fabric fiber before heating, and can be spirally crimped to shrink by heating at a specific temperature. By using potentially crimped fibers, both heat shrinkability and elastomeric behavior can be exhibited simultaneously.

The latent crimpable fiber includes, for example, an eccentric core-sheath type or a side-by-side type composite fiber comprising two thermoplastic polymer materials having different shrinkage ratios. As an example, the one disclosed in Japanese Patent Laid-Open No. Hei 9-296325 or Japanese Patent No. 2759331 is exemplified. The second fiber layer 22 may contain, for example, such a latent crimpable fiber, and the fiber may be crimped and contracted by heating while or after the first fiber layer 21 is thermally fused.

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

According to the sanitary napkin 1 of the above-described embodiment, the body fluid rapidly moves from the skin contact surface side to the non-skin contact surface side, so that the dry feeling is excellent. Further, since the absorption performance of the lower absorbent body 42 can be effectively utilized, it can be preferably used particularly in the case of use for a large amount of menstrual blood or a long-term use such as nighttime.

The absorbent article of the present invention is not limited to the above embodiment, and may be appropriately modified without departing from the gist of the present invention.

For example, the absorbent article of the present invention can have a plurality of upper absorbent bodies. In this case, a plurality of the upper absorbent bodies may be laminated in the thickness direction of the absorbent article, and a plurality of the upper absorbent bodies may be disposed in the longitudinal direction or the width direction of the absorbent article, respectively.

Further, in the sanitary napkin 1 of the present embodiment, the absorbent body 4 is in a state in which the upper layer absorbent body 41 is laminated on the lower layer absorbent body 42 and is covered with the liner paper 9, but from the viewpoint of the processability of the sanitary napkin 1. The upper layer absorber 41 and the lower layer absorber 42 may also be covered with a liner paper, respectively.

Further, the sanitary napkin 1 of the present embodiment can have a pair of side flap portions in the excretory portion opposing portion B. Further, the sanitary napkin 1 has a pair of side leakage preventing portions on both sides in the longitudinal direction of the sanitary napkin on the skin contact surface side. Further, the sanitary napkin 1 may have a pair of rear wing portions at the rear portion C.

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

1. . . Physiological cotton

2. . . Front sheet

3. . . Back sheet

4. . . Absorber

5. . . Deep recess

6. . . Shallow recess

7. . . Embossing groove

7a, 7b, 7c. . . Bending into a convex part

9. . . Lining paper

twenty one. . . First fiber layer

twenty two. . . Second fiber layer

twenty three. . . Hot melt

twenty four. . . Convex

41. . . Upper absorber

41a. . . Both sides of the length direction of the upper absorbent body 41

42. . . Lower absorber

A. . . Front part

B. . . Excretory department

C. . . Rear part

Q. . . Area where the shallow recess 6 is not formed

R. . . Forming the area of the shallow recess 6

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

Fig. 2 is an enlarged X-X line sectional view of the sanitary napkin of Fig. 1.

Figure 3 is a plan view showing the embossing groove of the sanitary napkin of Figure 1 in an enlarged manner.

Fig. 4 is a plan view showing a region in which a shallow recessed portion is formed in the sanitary napkin of Fig. 1.

Fig. 5 (a) is an enlarged longitudinal sectional perspective view showing a portion of a front sheet of the sanitary napkin of Fig. 1.

Fig. 5 (b) is an enlarged cross-sectional view showing a portion of the front sheet of the sanitary napkin of Fig. 1 taken along the line Y-Y shown in Fig. 5 (a).

1. . . Physiological cotton

2. . . Front sheet

4. . . Absorber

7. . . Embossing groove

41. . . Upper absorber

41a. . . Both sides of the length direction of the upper absorbent body 41

42. . . Lower absorber

A. . . Front part

B. . . Excretory department

C. . . Rear part

Claims (4)

An absorbent article comprising a front sheet, a back sheet, and an absorbent body sandwiched between the sheets, and is substantially elongated, wherein the absorbent system has one or more upper layer absorbing volume layers in the lower layer absorber Formed on the skin contact surface, one or a plurality of the upper layer absorbers, at least in the central portion of the upper layer absorber, formed from the non-skin contact surface side of the lower layer absorber toward the skin contact surface side of the upper layer absorber The plurality of deep recesses are integrally joined to the lower layer absorber, and the deep recesses are not formed in the back sheet, and penetrate the lower layer absorber in the thickness direction, and the bottom of the deep recess is located in the upper layer absorber. a plurality of shallow recessed portions are formed on the outer side of the portion of the lower layer absorber in which the upper layer absorber is laminated, and the lower layer absorber is formed on the outer side of each of the both sides of the absorbent article in the longitudinal direction of the upper layer absorber. a embossing groove extending in a direction, wherein the front sheet and the lower layer absorber are joined by the embossing groove, The shallow recessed portion is not formed in the region in which the embossing groove is formed, and the deep recessed portion, the embossed groove, and the above are sequentially formed in the opposing portion of the absorbent portion in the direction of the discharge portion from the center in the width direction of the absorbent body. The shallow recess, and the recess and the embossing groove are not formed in the region between the deep recess and the embossing groove. An absorbent article according to claim 1 which has a lengthwise upper portion a layer absorber, the upper layer of the absorption layer being at a central portion of the lower layer absorber. The absorbent article according to claim 2, wherein the embossing groove has one or a plurality of portions which are curved toward the outer side in the width direction of the absorbent article and are connected in the longitudinal direction of the absorbent article, and are bent into The convex portion is located on the outer side of the opposing portion of the excretory portion of the absorbent article. The absorbent article according to any one of claims 1 to 3, wherein the shallow concave portion is formed from a non-skin contact surface side of the absorbent body.