TW201628574A - Absorbent article - Google Patents

Abstract

Provided is an absorbent article in which an absorbent body (4) includes cellulose-based water-absorbent fibers (11), and thermoplastic resin fibers (12) having a longer fiber length than the cellulose-based water-absorbent fibers (11). The thermoplastic resin fibers within the absorbent body (4) have first sections that are exposed at the surface of a liquid-permeable layer side of the absorbent body (4), second sections that are exposed at the surface of a liquid-impermeable layer side of the absorbent body, and connecting sections that connect the first sections and the second sections. The absorbent body (4) is provided with a first area (15) having a preset basis weight, and a second area (16) having a higher basis weight than the first area (15). The second area (16) is configured such that the basis weight of the thermoplastic resin fibers therein is higher than in the first area (15).

Description

Absorbent article

The present invention relates to an absorbent article such as a sanitary napkin, a disposable disposable diaper, an incontinence gasket, and the like.

The sanitary napkin for absorbing the excretory fluid such as menstrual blood includes a liquid permeable layer (so-called top sheet) on the skin side of the wearer and a liquid impervious layer on the side of the garment (so-called The back sheet) and the absorber provided between the liquid permeable layer and the liquid impermeable layer are generally used.

In such an absorbent article, a cellulose-based water-absorbent fiber such as pulp or an absorbent body of a thermoplastic resin fiber such as polyethylene is widely used, and in order to firmly secure such an absorbent body, Since the excretion liquid from the wearer is absorbed, the area where the excretion liquid is mainly excreted has a higher base area which increases the amount of the fiber than the other areas, and there is a possibility of improving the absorption capacity of the excretion liquid.

When a high-basisity region is formed in the absorbent body, for example, as described in Patent Document 1, a plurality of sheets of the liquid-absorbent sheet member of the plurality of sheets are stacked, or as disclosed in Patent Document 2, a wide suction by folding is performed. The multi-layered absorbent layer is formed to form a portion having a high basis weight.

However, in the case of the absorbent body of Patent Document 1 and Patent Document 2, the basis weight of the absorbent body is improved, but the absorbent body becomes easily distorted due to the action of the wearer or the absorption of the excretion liquid by the absorbent body. In the case of peeling between the overlapping absorbent sheets or between the plurality of absorbent layers, breakage may occur, and absorption performance and durability may be remarkably lowered. Further, in order to improve the durability of the absorbent body, it is also conceivable to apply a hot-melt type adhesive between the absorbent sheets and the absorbent layer. However, at this time, the liquid permeability of the excretion liquid is lowered, and conversely, the absorption property is inhibited. possibility.

[Previous Technical Literature]

[Patent Document]

[Patent Document 1] Japanese Patent Publication No. 2002-517280

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2005-102864

An object of the present invention is to provide an absorbent body comprising a cellulose-based water-absorbent fiber and a thermoplastic resin fiber, which has high absorption performance and which does not cause peeling or the like even if the user operates. An absorbent article that maintains a highly durable absorbent body.

In order to solve the aforementioned problems, the absorbent article of the present invention is As described next.

(1) An absorbent article comprising: a liquid-permeable layer; a liquid-impermeable layer; and an absorbent article of the absorbent body between the liquid-permeable layer and the liquid-impermeable layer, wherein the absorbent body And comprising: a cellulose-based water-absorbent fiber; and a thermoplastic resin fiber having a fiber length longer than the cellulose-based water-absorbent fiber, wherein at least a part of the thermoplastic resin fiber in the absorber has an exposed body a first portion of the surface on the liquid-permeable layer side; a second portion exposed on a surface of the absorber on the liquid-impermeable layer side; and a connecting portion connecting the first portion and the second portion, and The absorber includes a first region having a predetermined amount of a predetermined amount and a second region having a higher basis amount than the first region, and the second region is a base of the thermoplastic resin fiber than the first region. The amount is higher.

(2) The absorbent article according to the above aspect, wherein the first region and the second region of the absorbent body are integrally formed by a single sheet member, and the second region is the sheet member. The first surface of the sheet member and the second surface opposite to the first surface are alternately folded, and are formed by compressing the folded portion in the thickness direction of the sheet member.

(3) The absorbent article according to the above aspect (1), wherein the absorbent body has a tensile strength in a thickness direction of 100 Pa or more.

(4) The absorbent article according to any one of the above-mentioned (1), wherein the absorbent body is provided in the thickness direction The embossed portion formed by embossing the absorbent body has an embossed portion in the second region that is deeper than the embossed portion in the first region.

(5) The absorbent article according to any one of the above (1), wherein the absorbent body and the liquid permeable layer are pressed from the liquid permeable layer side. The press sections formed by the liquid permeable layer are joined to each other, and the press section is provided in the first region.

The absorbent article according to any one of the above aspects of the present invention, wherein the absorbent body is on one side of the liquid-permeable layer side or the liquid-impermeable layer side. A second liquid permeable layer that is attached across the first region and the second region is provided.

(7) The absorbent article according to the above aspect, wherein the absorbent body is provided to penetrate the second liquid permeable layer in a thickness direction of the second liquid permeable layer, and does not reach and mount the first a plurality of slits on the surface opposite to the surface of the liquid-permeable layer, wherein the second slit provided in the second region among the slits is the first slit provided in the first region in the absorber The thickness is deeper in the direction.

The absorbent article according to any one of the above aspects of the present invention, wherein the absorbent body is provided with the thermoplastic resin fiber oriented in a thickness direction of the absorbent body in the second region. section.

(9) The absorbent article according to any one of the above-mentioned (1), wherein the absorbent body has the same maximum thickness of the first region and the second region.

According to the absorbent article of the present invention, the absorbent body is composed of a cellulose-based water-absorbent fiber and a thermoplastic resin fiber having a longer fiber length than the cellulose-based water-absorbent fiber, and at least a part of the thermoplastic resin fiber has: a first portion exposed on a surface of the absorber on the liquid-permeable layer side; a second portion exposed on a surface of the absorber on the liquid-impermeable layer side; and a connection connecting the first portion and the second portion section. Thereby, since the thermoplastic resin fiber can suppress the peeling of the first surface and the second surface of the absorber, the durability of the absorber can be improved.

Further, since the absorbent body has a higher basic amount than the first region, the thermoplastic resin fiber has a higher base amount than the first region, and therefore, even if the absorbent body absorbs the excretion liquid and becomes wet, It is also possible to suppress the distortion by the aforementioned thermoplastic resin fibers having a long fiber. Thereby, the deterioration of the durability of the absorber is suppressed, and the decrease in the absorption performance of the second region having a high basis amount can be suppressed.

1‧‧‧Physical sanitary napkins (absorbent articles)

2‧‧‧Top sheet (liquid permeable layer)

3‧‧‧Back sheet (liquid impervious layer)

4‧‧‧Acceptor

5‧‧‧Second sheet (second liquid permeable layer)

11‧‧‧ Cellulose absorbent fibers

12, 12', 12" ‧ ‧ thermoplastic resin fiber

12’a, 12”a‧‧‧Part 1

12’b, 12”b‧‧‧ Part 2

12’c, 12”c‧‧‧ link

15‧‧‧1st area

16‧‧‧2nd area

21, 22‧‧‧ embossing department

25‧‧‧Squeeze

31, 32‧‧ ‧ slit

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

Fig. 2 is a cross-sectional view showing the I-I of the sanitary napkin shown in Fig. 1.

Fig. 3 is a view schematically showing a state of a thermoplastic resin fiber of an absorbent body in the absorbent article of the present invention.

Figure 4 is a view showing the embossing of the absorbent body of the absorbent article of the present invention; An enlarged cross-sectional view of an essential part of the state of the part.

Fig. 5 is a view schematically showing a state of the thermoplastic resin fiber in the embossed portion.

Fig. 6 is a plan view showing a state in which a slit is provided in an absorbent body in the absorbent article of the present invention.

Figure 7 is a cross-sectional view.

Fig. 8 is a view schematically showing a manufacturing apparatus for producing an absorbent article of the present invention.

Fig. 9 is a view schematically showing a mold member of a suction cylinder in the manufacturing apparatus of Fig. 8; However, (a) is a plan view, (b) is a cross-sectional view of II-II in (a), and (c) is a cross-sectional view of III-III in (a).

Fig. 10 is a view schematically showing a state in which fibers are laminated on the mold member of Fig. 9 to form a sheet member.

Fig. 11 is a view for explaining the source of the absorber of the sheet member having the first region and the second region. However, in order to respectively indicate (a) a state in which the sheet member is transferred from the mold member to the second sheet continuous body, (b) a state in which the protruding portion of the sheet member collapses, (c) the protruding portion of the sheet member collapses to form a folded portion The state of the portion, (d) is a state in which the folded portion of the sheet member is compressed to form a uniform thickness of the absorber.

[Formation for carrying out the invention]

1 to 7 are views showing an embodiment of the absorbent article of the present invention, and in the embodiment, the absorbent article is a living. Explain the use of sanitary napkins.

Specifically, the sanitary napkin 1 has a longitudinal direction, a wide width direction, and a thickness direction, and is provided with a top sheet 2 as a liquid permeable layer, and is disposed on one surface side of the top sheet 2 a back sheet 3 of the liquid-impermeable layer; and an absorber 4 disposed between the top sheet 2 and the back sheet 3. Further, between the absorber 4 and the top sheet 2, a second sheet 5 extending in the longitudinal direction of the absorber 4 is disposed as a second liquid permeable layer.

Further, the sanitary napkin 1 is provided with a pair of side sheets 6 and 6 on both end sides in the wide direction of the sanitary napkin, and the side sheet is provided with a crotch portion that is fixed to the undergarment when in use. Wing 7.

Further, the back sheet 3 and the wing portion 7 are provided with an adhesive sheet 8 for adhering the sanitary napkin 1 to the crotch portion of the undergarment.

The top sheet 2 is in contact with the skin of the wearer, and the excretion liquid such as menstrual blood from the user is quickly absorbed or transmitted, and the excretion liquid is moved toward the second sheet 5 and the absorber 4, so that it is disposed in the absorber. The side of the 4 that faces the skin of the user (the upper side of the absorber 4 in Fig. 2).

In the embodiment, the top sheet 2 is formed long along the longitudinal direction of the sanitary napkin.

The top sheet 2 may be formed of, for example, a nonwoven fabric, a woven fabric, a synthetic resin film having a liquid perforation hole, a mesh sheet having a mesh, or the like, but it is preferably a non-woven fabric.

The back sheet 3 is provided in the sanitary napkin 1 The undergarment side of the user (the lower side of the absorbent body 4 in Fig. 2) prevents the discharge of the discharged excretion liquid and prevents leakage to the underwear or the like.

The back sheet 3 is joined to each other at the peripheral edge portion in a state in which the top sheet 2 and the side sheets 6 and 6 sandwich the absorber 4 and the second sheet 5. The bonding means is, for example, any means such as bonding by a hot-melt type adhesive, bonding by hot embossing, and joining by ultrasonic embossing.

Further, in the present invention, as the back sheet, for example, a nonwoven fabric to which a water repellent treatment, a synthetic resin film such as polyethylene or polypropylene, or a composite sheet of a non-woven fabric and a synthetic resin film can be used (for example, in spunbond, water needle, etc.) The non-woven fabric is bonded to a composite film of a breathable synthetic resin film, and an SMS nonwoven fabric having a high-strength melt-blown nonwoven fabric is sandwiched between the high-strength spunbonded nonwoven fabric.

The pair of side sheets 6 and 6 prevent the excretion liquid from the user from leaking to the outside from both sides in the width direction of the sanitary napkin 1, and at least a part of the side sheets 6, 6 are respectively The both sides of the top sheet 2 in the width direction are covered, and the surface of the top sheet 3 corresponding to the portion of the pair of wing portions 7, 7 is covered.

Further, it is preferable that the pair of side sheets 6 and 6 have hydrophobicity or water repellency to prevent leakage of body fluid, and for example, they can be formed of a material such as a spunbonded nonwoven fabric, an SMS nonwoven fabric, or a hot air non-woven fabric.

The second sheet 5 is a method of absorbing excretion liquid from the top sheet 2 and moving it to the absorber 4. In the embodiment, the second sheet The sheet 5 is formed in a substantially elliptical shape having substantially the same size in plan view shape as the absorber 4, and the surface on the top sheet side and the surface on the absorber side of the top sheet 2 and the surface on the absorber side. The top sheet side of the absorbent body 4 is followed by a hot melt type adhesive, respectively.

Further, the second sheet 5 may be formed of, for example, a nonwoven fabric, a woven fabric, a synthetic resin film having a liquid permeation hole, a mesh sheet having a mesh, or the like, similarly to the top sheet 2, but it is preferable that Not woven.

Further, the absorbent body 4 is a person who absorbs the excretion liquid of the user, and the cellulose-based water-absorbent fiber 11 and the thermoplastic resin fiber 12 having a longer fiber length than the cellulose-based water-absorbent fiber 11 further include: water absorption. Polymer 13. In the embodiment, the absorber 4 is convexly curved toward the outer direction of the longitudinal direction of the absorber 4 in the longitudinal direction, and forms a slightly longer circle than the top sheet 2 and the back sheet 3. shape.

Further, in the absorbent body 4, at least a part of the thermoplastic resin fiber 12 in the absorbent body 4 is exposed on the top sheet 2 side of the absorbent body 4 (in the case of the embodiment, strictly speaking, the second sheet 5) a first portion of the surface of the side, a second portion exposed on the surface of the back sheet 3 on the side of the back sheet 3, and a connecting portion connecting the first portion and the second portion.

In the present invention, the "exposure" of the thermoplastic resin fiber is such that the thermoplastic resin fiber exists on the liquid-permeable layer side of the absorber (the top sheet side at the time of the embodiment) or liquid The surface of the impervious layer side (the side of the back sheet is the side of the embodiment).

More specifically, in the embodiment, as shown in Fig. 3, the thermoplastic resin fiber 12' of a part of the thermoplastic resin fiber 12 is at one end (in Fig. 3, the end on the left side) The first portion 12'a having the surface 4a exposed on the top sheet side of the absorber 4 is exposed on the other end (in the end portion on the right side in Fig. 3). The second portion 12'b of the surface 4b on the side of the back sheet 3 of the absorber 4. Further, a connecting portion 12'c is provided between the first portion 12'a and the second portion 12'b.

Further, the thermoplastic resin fiber 12" of the other part of the thermoplastic resin fiber 12 has a top surface sheet exposed on the absorbent body 4 at one end portion (the end portion on the right side in Fig. 3). The first portion 12"a of the surface 4a on the second side has the second surface 4b exposed on the back sheet side of the absorber 4 at the other end portion (the end portion on the left side in Fig. 3). The portion 12"b. Further, a connecting portion 12"c is provided between the first portion 12"a and the second portion 12"b.

Further, as shown in Fig. 3, the connecting portions 12'c, 12"c of the thermoplastic resin fibers 12', 12" are oriented in the thickness direction of the absorber 4.

In the absorbent body of the present invention, at least a part of the thermoplastic resin fiber has a first portion exposed on the liquid permeable layer side and a second surface exposed on the liquid impermeable layer side of the absorbent body. Part; and the link between the first part and the second part, so The thermoplastic resin fiber functions as a component for holding the absorbent body, for example, as a skeleton for holding the cellulose-based water-absorbing fiber, and the strength of the absorbent body is improved. As a result, when a force such as a body pressure is applied, the in-layer peeling is less likely to occur inside the absorbent body, and the absorbent body (and the absorbent article) is larger than the absorbent body not including the thermoplastic resin fiber, for example, an absorbent body containing only pulp. It is more difficult to distort.

Further, in the absorbent article of the present invention, when it is used for an absorbent article, it is carried on a layer adjacent to the wearer side of the absorbent body (for example, a liquid permeable layer); and/or a layer adjacent to the garment side of the absorbent body ( For example, a liquid impermeable layer). In this case, since the first portion and/or the second portion of the thermoplastic resin fiber are more stably fixed to the layers, the peeling of the inner layer of the absorbent body is less likely to occur by the action of the connecting portion. In turn, the absorber is made less susceptible to distortion.

Further, in the present invention, the thermoplastic resin fiber preferably has a thickness of the absorbent body of about 2 times or more, more preferably about 3 times or more, more preferably about 4 times or more, and still more preferably about 5 times or more. It is most ideal for an average fiber length of about 7 times the magnification. When the magnification is less than about twice, the thermoplastic resin fiber tends to be exposed on both the surface of the absorber on the liquid-permeable layer side and the surface of the absorber on the liquid-impermeable layer side.

On the other hand, the thermoplastic resin fiber has an average fiber length of preferably 30 times or less, more preferably about 20 times or less, and most preferably about 15 times or less of the thickness of the absorber. If the above magnification is more than about 30 times, the opening of the thermoplastic resin fiber is insufficient, and there is a hindrance. In the case of the uniformity of the absorber.

Further, in the present invention, the thermoplastic resin fiber desirably has an average fiber length of from about 5 to about 50 mm, more preferably from about 10 to about 30 mm. When the average fiber length is less than about 5 mm, the thermoplastic resin fiber tends to be exposed on both the surface on the liquid-permeable layer side of the absorber and the surface on the side of the liquid-impermeable layer. The thermoplastic resin fiber tends to be less likely to be entangled with other thermoplastic resin fibers and/or cellulose-based water absorbent fibers.

On the other hand, when the average fiber length is more than about 50 mm, the fiber opening property of the thermoplastic resin fiber is remarkably lowered, and the absorbent body contains thermoplastic resin fibers which are not opened, and the uniformity of the absorbent body tends to decrease.

Further, the above average fiber length is particularly preferable in the case where the absorbent body of the present invention is mixed with cellulose-based water-absorbing fibers by air flow, for example, with pulp.

In the thermoplastic resin fiber and the cellulose-based water-absorbent fiber of the present invention, the average fiber length of the regenerated cellulose fiber and the semi-synthetic fiber other than the pulp is based on "A7" in the attached book A of JIS L 1015:2010. "Measurement of fiber length", "Method for measuring the length of each fiber on a glass plate marked with the A7.1.1 method (standard method) scale" is measured. Further, the above method is equivalent to the test method of ISO 6989 issued in 1981.

Further, in the present invention, the thermoplastic resin fiber preferably has a fineness of from about 0.5 to about 10 dtex, and more preferably has about 1.5 to about A fineness of about 5dtex. When the fineness is less than about 0.5 dtex, the fiber opening property of the thermoplastic resin fiber may be lowered. On the other hand, if the fineness exceeds 10 dtex, the number of thermoplastic resin fibers is small, and other thermoplastic resins are used. The number of dots where the fibers and/or the cellulose-based water-absorbent fibers are entangled with each other tends to be small.

Further, the absorbent body of the present invention is preferably a content ratio of the thermoplastic resin fiber of from about 5 to about 30% by mass, more preferably from about 10 to about 20% by mass. When the content ratio of the thermoplastic resin fiber is less than about 5% by mass, the strength of the absorbent body is insufficient, and the absorbent body tends to be easily twisted. On the other hand, if it exceeds 30% by mass, the cellulose absorbent having excellent absorbability is used. The content ratio of the fibers is too low, and the absorbability of the absorbent body tends to be insufficient.

Further, in the present invention, the lower limit of the tensile strength in the thickness direction of the absorbent body is 100 Pa or more, preferably 150 Pa or more, more preferably 200 Pa or more, and still more preferably 250 Pa or more. When the tensile strength is less than 100 Pa, the strength of the absorbent body is weak, and the absorbent body tends to be easily twisted. Further, the upper limit of the tensile strength in the thickness direction of the absorbent body is not particularly limited, but may be 3,000 Pa or less from the viewpoint of softness.

In addition, the tensile strength in the thickness direction of the absorber is measured, for example, by the method described in Japanese Patent No. 5579337.

The thickness of the absorbent body is preferably different depending on the use of the absorbent body, etc., and in the case of the physiological sanitary napkin 1 of the embodiment, it is preferably about 1 to about 6 mm, more preferably about 1.5~ about 3mm. If the thickness is less than about 1 mm, the flexibility of the absorbent body may be impaired. If it exceeds about 6 mm, the thickness of the absorbent body is generally too thick. And the sense of use.

However, in the case of an absorbent article including a disposable disposable diaper, an incontinence pad, or the like, it is generally preferable to use from about 0.1 to about 15 mm, preferably from about 1 to about 10 mm, depending on the use of the absorbent body. A thickness of about 1.5 to about 5 mm.

In the present invention, the thickness (mm) of the absorbent body is measured by the following method.

FS-60DS (measuring surface 44 mm (diameter), measuring pressure 3 g/cm ² ) manufactured by Daiei Scientific Seiki Co., Ltd., under standard conditions (temperature 23 ± 2 ° C, relative humidity 50 ± 5%), The five different portions of the absorbent body were pressurized, and the thickness after pressing for 10 seconds in each portion was measured, and the average value of the five measured values was used as the thickness of the absorbent body.

Further, in the present invention, the cellulose-based water-absorbing fiber forming the absorbent body may be a pulp, and for example, wood pulp, bagasse, kenaf, bamboo, and hemp obtained by using conifer or broad-leaved trees as raw materials may be mentioned. Non-wood pulp such as cotton (for example, cotton linters); regenerated cellulose fibers such as rayon fibers; semi-synthetic fibers such as acetate fibers. In view of the above pulp, it is desirable to obtain a kraft pulp which is industrially inexpensive and has high safety.

The average fiber length of the cellulose-based water-absorbing fibers is not particularly limited. Further, when the cellulose-based water-absorbing fiber is a regenerated cellulose fiber or a semi-synthetic fiber, it may have a thickness of from about 3 to about 70 mm and from about 5 to about The average fiber length of 50 mm, about 10 to about 40 mm, and the like. The regenerated cellulose fiber, the semi-synthetic fiber, and the like have the same function as the thermoplastic resin fiber when the fiber length is dried, and the absorber can be provided with less distortion.

Further, in the present invention, the average fiber length in the case where the cellulose-based water-absorbing fiber is pulp is a weight-increasing average fiber length, and is a fiber using a Kayani fiber analyzer manufactured by Metso Automation. The meaning of the L(w) value measured by the feature (offline) [kajaaniFiberLab fiber properties (off-line)]. Moreover, the average fiber length in the case where the cellulose-based water absorbent fiber is other than pulp is as described above.

Further, in the present invention, the water-absorbent polymer forming the absorbent body may, for example, be a polyacrylate type, a polysulfonate type, an anhydrous maleate type, a polypropylene amide type, or a poly Superabsorbent resin such as vinyl alcohol, polyethylene oxide, polyaspartate, polyglutamate, polyalginate, starch, or cellulose (Super Polymer: SAP However, it is preferable that the superabsorbent resin of the polyacrylic acid salt type (especially, polyacrylic acid sodium type) is preferable.

However, the absorber 4 is a first region 15 having a base amount set in advance, and a second region 16 having a higher base amount than the first region 15 .

In this manner, the second region 16 is provided with a higher base amount than the first region 15 in order to allow the second region 16 to correspond to the excretion position of the installer, thereby making the excretion liquid from the installer more reliable and efficient. Absorbed, and to ensure the durability of the distortion and bending of the absorber, to stop the absorber or absorbent Distortion of the product. In the embodiment, the second region 16 is provided at a substantially central portion in the longitudinal direction and the broad side direction of the absorber 4, and the first region 15 is disposed to surround the second region 16 in plan view. .

Further, the absorber 4 is formed of a single layer, and has a structure in which peeling does not occur in the absorber 4, and in particular, a structure in which peeling does not occur in the second region which is a high basis amount region. Therefore, as in the conventional absorber, interlayer peeling does not occur in a high-basisity region, and there is almost no decrease in absorbability when a hot-melt type adhesive is applied between layers.

Further, in the absorber 4, the maximum thickness of the first region 15 and the second region 16 is the same, and the thickness of the entire absorber 4 is substantially constant even in the first region 15 in the second region 16. The absorbent body 4 has almost a certain thickness as a whole. Thereby, the thinness of the absorber which is necessary as a physiological sanitary napkin as the whole absorbent body can be formed.

In the present invention, the first region is preferably a basis weight of from about 100 to about 350 g/m ² , more preferably from about 150 to about 250 g/m ² . When the basis weight of the first region is less than about 100 g/m ² , the strength and absorbability of the first region are too low. On the other hand, if it exceeds about 350 g/m ² , the first region which accounts for most of the absorber becomes It is too hard, and the flexibility as the whole of the absorber is lowered. In particular, in the case of a thin sanitary napkin, there is a possibility that the feeling of use may be problematic.

On the other hand, in the present invention, the second region is preferably a basis weight of from about 200 to about 500 g/m ² , more preferably from about 250 to about 350 g/m ² . When the basis weight of the second region is less than about 200 g/m ² , the absorption capacity becomes too low as a region mainly absorbing the excretory liquid of the user, and when it exceeds about 500 g/m ² , the thin physiological condition is used. In the sanitary napkin, since the fibers are excessively densified, the second region becomes too hard, and the flexibility as the entire absorbent body is greatly impaired.

Further, in the second region 16, the basis amount of the thermoplastic resin fiber is higher than that in the first region.

In this way, the base amount of the thermoplastic resin fiber in the second region is made higher than that in the first region because the second region absorbs the excretion liquid in a wet state, in order to easily maintain the bulkiness and prevent the durability. decline.

That is, when the absorbent body absorbs the excretion liquid to be wet, the space formed by the cellulose-based water-absorbing fibers representing the pulp in the second region is reduced, because the second region is the basis of the thermoplastic resin fiber. Since the area of the first region is higher, the thermoplastic resin fiber functions as a skeleton of the absorber, and the space is stably suppressed, and the bulkiness is easily maintained. In addition, when the absorbent body is in a wet state, the resilience of the space formed by the cellulose-based water-absorbing fibers such as pulp tends to be distorted, and the twisting force tends to be distorted, but the thermoplastic resin fibers of the second region are used. Since the amount of the base is higher than that of the first region, the thermoplastic resin fiber functions as a skeleton of the absorber, and the decomposition of the absorber is stably suppressed, and the durability is easily maintained.

In the invention, the basis weight of the thermoplastic resin fiber in the second region is preferably from about 15 to about 90 g/m ² , more preferably from about 30 to about 60 g/m ² .

When the basis weight of the thermoplastic resin fiber in the second region is less than about 15 g/m ² and the absorbent body is in a wet state, sufficient bones required for supporting the cellulose-based water-absorbent fiber such as pulp cannot be formed. Therefore, it is difficult to maintain the bulkiness in a wet state, and if it exceeds about 90 g/m ² , the content ratio of the absorbent body of the cellulose water-absorbing fiber having high water absorbability becomes too low, and excretion is caused. Liquid inhalation performance becomes lower.

On the other hand, the basis weight of the thermoplastic resin fiber in the first region is preferably from about 10 to about 60 g/m ^{2 in} a range lower than the basis amount of the thermoplastic resin fiber in the second region, and more preferably. It is made from about 15 to about 45 g/m ² . When the basis weight of the thermoplastic resin fiber in the first region is less than about 10 g/m ² , the maintenance of bulkiness in a wet state is difficult in the same manner as in the second region, and if it exceeds about 60 g/m ² , The thermoplastic resin fiber that becomes the skeleton of the absorber changes the rigidity of the first region too much, and impairs the flexibility required in the first region.

Further, the absorber 4 has a portion in which the thermoplastic resin fibers 12 are oriented in the thickness direction of the absorber 4 in the first region 15 and the second region 16.

As described above, the thermoplastic resin fibers 12' and 12" as a part of the thermoplastic resin fiber 12 are in a state in which the connecting portions 12'c, 12"c are oriented in the thickness direction of the absorber, so that Both the first region 15 and the second region 16 have portions in which the thermoplastic resin fibers are oriented toward the thickness direction of the absorber.

In the first region 15 and the second region 16, if the thermoplastic resin fiber 12 is oriented toward the thickness direction of the absorber 4, the shape of the entire absorber 4 is easily maintained, so that even if In the case of the pressure absorbing body 4, it is also possible to suppress the exudation of the excretion liquid after absorption as much as possible, that is, the case where the rewet can be suppressed as much as possible.

Moreover, as shown in FIG. 4, the absorber 4 of this embodiment is equipped with the some embossing parts 21 and 22 formed by embossing the absorber 4 in the thickness direction, and the embossing of the 2nd area|region 16 The portion 22 is formed deeper than the embossed portion 21 of the first region 15 . The embossed portions 21 and 22 are provided at equal intervals with each other as the entire absorbent body 4 regardless of the first region 15 and the second region 16.

Thus, by providing the embossed portions 21, 22 in the absorber 4, as shown in Fig. 5, a part of the thermoplastic resin fibers 12', 12" in the thermoplastic resin fiber 12 is caused by the embossed portions 21, 22. The compression portion 23 is entangled, and the thermoplastic resin fibers 12', 12" are coupled via the embossed portions 21, 22. Thereby, the absorber 4 is equivalent to a thermoplastic resin fiber having a longer average fiber length, and the thermoplastic resin fibers 12', 12" are used as other components of the absorber, for example, as a cellulose-based absorbent fiber. In addition, since the embossed portions 21 and 22 partially fix the thermoplastic resin fibers 12' and 12", the embossed portions 21 and 22 are applied to the skeletal body. At the same time, the fibers are not easily moved, and since the thermoplastic resin fibers 12', 12" are surely fixed, the strength of the absorbent body is improved.

Further, since the embossed portion 22 of the second region 16 is formed deeper than the embossed portion 21 of the first region 15, the second region 16 has a larger amount of compression than the first region 15. Therefore, the second region 16 is a cellulose-based water-absorbent fiber such as pulp because of the fiber density of the first region 15 Since the fiber density of the dimension is increased, the inhalation property of the excretory liquid is higher than that of the first region 15, and the rigidity is also increased. Thereby, even if the second region 16 absorbs more excretion liquid, the deformation of the second region 16 can be suppressed as much as possible, and the excretion liquid can be efficiently absorbed while suppressing rewet.

On the other hand, since the embossed portion 21 of the first region 15 is shallower than the embossed portion 22 of the second region 16, the amount of compression is smaller than that of the second region 16, and the fiber density is also lower than that of the second region 16. Therefore, the flexibility is higher than that of the second region 16. Thereby, the first region 15 is more likely to be softly deformed in accordance with the movement of the wearer than the second region 16, and the feeling of use is improved.

Further, it is preferable that the embossed portions 21 and 22 are fused with other fibers. The above effects are easily obtained by melting the thermoplastic resin fibers with other fibers, particularly with other heat-fusible fibers.

Here, the depth of the embossed portion of the second region can be set to an arbitrary depth as long as it is deeper than the depth of the embossed portion of the first region. The depth of the embossed portion of the second region may be, for example, about 20 to 95% of the thickness of the absorbent body, and more preferably about 30 to 90%, depending on the thickness of the absorbent body. The ideal is to make about 40~85%.

If it is less than 20%, the compression of the second region is insufficient, and the desired fiber density cannot be obtained. Therefore, the inhalation property of the excretion liquid is lowered and the rigidity is also small. If it exceeds 95%, the excessive compression rigidity is too high, and the flexibility is made soft. Sexually impaired.

Further, the depth of the embossed portion of the first region is shallower than the embossed portion of the second region, for example, 5 to the thickness of the absorber. The depth of about 80% is ideal, more ideally it is about 10~70%, and then ideally it is about 15~60%. If it is less than 5%, sufficient rigidity cannot be obtained and it is easy to be distorted. If it exceeds 80%, the rigidity is too high to obtain flexibility, and the feeling of use is deteriorated.

In addition, the depth of each embossing part can be measured by any method, and can be measured by the method of measuring various dimensions of the thickness direction of the sheet, for example, as described in Unexamined-Japanese-Patent No. 2012-162842.

In other words, a test piece of a predetermined size including the embossed portion is cut out from the absorber, and a three-dimensional measuring instrument (a high-precision shape measuring system (including a high-precision platform: KS-1100) manufactured by Keyence Co., Ltd.) is used. With the high-speed ‧ high-precision CCD laser displacement meter (including controller: LK-G3000V group, sensing head: LK-G30), the cross-sectional shape of the test piece was measured. Further, with respect to the measured cross-sectional shape, in order to obtain the outline of the cross-sectional shape to which the smoothing treatment is applied, in addition to the image data processing, the outline of the cross-sectional shape of the embossed portion is defined in accordance with the contour line to which the smoothing treatment is applied, Further, the depth of the embossed portion can be determined in accordance with the size of each portion obtained from the outline of the cross-sectional shape of the embossed portion.

Further, in the embodiment, the absorber 4 and the top sheet 2 as the liquid permeable layer are joined to each other by the press portion 25 formed by pressing from the top sheet side. Thereby, the absorber 4 and the top sheet 2 are integrated, and even if the sanitary napkin 1 is bent or twisted along the body of the wearer, the absorber 4 and the top sheet 2 are constantly moved integrally, and can be attached to the use. It is true that the excretory fluid is inhaled for absorption.

Further, the press portion 25 is provided in the absorber 4 in the first region 15 s position. In general, when the absorbent body is pressed, the rigidity of the press portion is increased. However, since the second region 16 has a higher rigidity than the first region 15, the rigidity of the second region 16 is prevented from being pressed. When it is too high, the first region 15 having high flexibility compared with the second region 16 is pressed, and the balance of the rigidity of the entire absorbent body 4 is obtained.

Here, the second sheet 5 is mounted on the surface of the top surface sheet 2 of the absorber 4 across the first region 15 and the second region 16 of the absorber 4.

As described above, by attaching the second sheet 5 across the first region 15 and the second region 16, the second sheet 5 relaxes the sharp change in the rigidity of the absorber 4. Thereby, the occurrence of the rupture of the absorber between the first region 15 and the second region 16 is stably prevented, and the absorbing body 4 or the sanitary tampon 1 is prevented from being sharply bent, and the physiology can be suppressed. Cotton 1 distortion caused by the situation.

Further, as shown in FIGS. 6 and 7, the absorber 4 penetrates the second sheet 5 in the thickness direction of the second sheet 5, and has a surface that does not reach the side opposite to the surface on which the second sheet 5 is attached ( At this time, a plurality of slits 31 and 32 of the surface on the back sheet side of the absorber 4 are formed.

Further, in the slits 31 and 32, the second slit 32 provided in the second region 16 of the absorber 4 is formed in the thickness direction of the absorber 4 than the first slit 31 provided in the first region 15. Deeper.

Thus, the reason why the absorbent body 4 is provided to penetrate the slits 31, 32 of the second sheet 5 in the thickness direction thereof is to make the absorbent body 4 soft. Soft improvement.

In other words, the absorbent body is provided with the second sheet and the rigidity of the second sheet is increased to increase the rigidity of the entire absorbent body, whereby the absorbent body of the absorbent article may be damaged by bending or the like. Softness. Therefore, by providing the slit in the thickness direction of the second sheet, the rigidity of the second sheet itself is lowered, and the influence of the second sheet on the softness of the absorbent body can be suppressed as much as possible, and the portion of the slit becomes absorbed. The starting point of the bending of the body is easily bent at the desired curvature.

Further, the slit is formed so as not to reach the surface on the opposite side to the surface on which the second sheet is attached, that is, the slit is not formed to penetrate the absorbent body, and the thermoplastic resin fiber and cellulose in the absorbent body are prevented. The water-absorbent fiber is completely cut, and the strength of the absorbent body is excessively distorted, and the decrease in absorbability due to deterioration of migration of the excretion liquid is suppressed.

In addition, the reason why the second slit 32 provided in the second region 16 of the absorber 4 is formed deeper in the thickness direction of the absorber 4 than the first slit 31 provided in the first region 15 is to allow The flexibility of the second region 16 which is higher in rigidity than the first region 15 is increased as much as possible, and the starting point of the bending of the second region 16 is formed, and the entire absorbent body 4 is easily bent.

Further, since the second region 16 is a region in which a large amount of excretion liquid is discharged from the first region 15, the surface area is enlarged by the second slit 32 deeper than the first slit, and the excretion liquid can be absorbed as efficiently as possible.

In the form of this embodiment, the slits 31 and 32 are all facing the physiological guard. The wide direction of the raw cotton, that is, the width direction of the absorbent body 4 is formed. As described above, the slits 31 and 32 extend in the width direction of the absorbent body 4, and are easily bent in the longitudinal direction of the absorbent body 4 in the longitudinal direction of the sanitary napkin 1, and on the other hand, the absorbent body 4 is oriented toward the wide width. The bending rigidity of the direction should not be excessively lowered, and it becomes a situation in which excessive distortion can be suppressed.

Further, the slits 31 and 32 are formed such that the first slit 31 of the first region 15 and the second slit 32 of the second region 16 are formed at substantially equal intervals and the same length as the entire absorbent body.

The length of the first and second slits is preferably about 4 to 45% of the width of the absorbent body, and more preferably about 7 to 25%, depending on the size of the absorber in a plan view. The ideal is about 10~20%. For example, when the width of the absorbent body 4 is about 60 to 70 mm, the length of the slit is preferably 3 to 30 mm, more preferably 5 to 15 mm, and still more preferably 7 to 12 mm.

Further, the depth of the second slit depends on the thickness of the absorber, but is preferably about 30 to 90% of the thickness of the absorber, more preferably about 40 to 80%, and still more preferably 50 to 70. %about. If it is less than 30%, the decrease in rigidity is insufficient, and softness cannot be obtained. When it exceeds 90%, the flexibility of the absorber is sufficient, but the strength of the second slit portion is lowered. There will be concerns that the absorber will break. For example, when the thickness of the absorber 4 is about 2 to 3 mm, the depth of the second slit is preferably 0.6 to 2.7 mm, more preferably 0.8 to 2.4 mm, and still more preferably 1 to 2.1 mm.

On the other hand, the depth of the first slit depends on the thickness of the absorber, but is shallower than the depth of the second slit, and is the absorber. The depth of about 5 to 70% of the thickness is ideal, more preferably about 10 to 60%, and then about 15 to 50%. If it is lower than 5%, sufficient flexibility cannot be obtained. On the contrary, if it exceeds 70%, the strength of the absorber is lowered. For example, when the thickness of the absorber 4 is about 2 to 3 mm, the depth of the first slit is preferably 0.1 to 2.1 mm, more preferably 0.2 to 1.8 mm, and more preferably 0.2 to 1.8 mm. 0.3~1.5mm.

Further, although the depths of the first slit and the second slit may be measured by any method, for example, the portion where the slit is formed may be cut by the absorber, and the cut surface may be enlarged by an electron microscope. depth.

Hereinafter, a method of manufacturing the sanitary napkin 1 having the above-described structure will be described.

When the sanitary napkin 1 of the embodiment is manufactured, for example, the manufacturing apparatus 50 of the type shown in FIG. 8 is used.

In the manufacturing apparatus 50, the first fiber opening device 52 that opens the first fiber web 51 including the thermoplastic resin fiber, and the second fiber web 53 that opens the cellulose-based water absorbent fiber such as pulp 2 fiber opening device 54. Further, the present invention further includes a transfer tube 55 that transports the opened fibers, and a detachable suction tube 56 that sucks the fibers in the transfer tube 55 so that the fibers are layered on the outer peripheral surface in a predetermined direction along the circumferential direction. In the plurality of concave mold members 57 disposed at intervals, the sheet member 58 serving as the absorber 4 is formed in the subsequent process.

Further, the second sheet of the second sheet continuous body 59 of the long length of the sheet member 58 on which the outer peripheral surface of the suction tube 56 is placed is wound up. The roller 60; and the sheet member 58 to be placed on the second sheet continuous body 59 are compressed together with the second sheet continuous body 59 in the thickness direction, and the embossing portion compression device 61 is formed.

Further, the second sheet continuous body 59 and the sheet member 58 are formed with slit forming means 62 for forming the first and second slits 31, 32 from the second sheet continuous body 59 side; and the first and second slits are formed. The second sheet continuous body 59 and the sheet member 58 of 31 and 32 are cut into a predetermined shape and size, and the cutting device 63 for the absorber of the single absorbent body 4 is completed.

In the absorber 4 that is conveyed toward the conveyance direction MD on the conveyance line, the roll sheet 65 for the back sheet which is joined by the long back sheet continuous body 64 from the upper surface side is joined, and the absorber 4 is attached to the absorber 4 The second sheet side (in this case, the lower side) winds out the long-out top sheet continuous body 66 to engage the unwinding roll 67 for the top sheet.

Further, the press device 68 which presses the absorber of the top sheet continuous body 66 and the back sheet continuous body 64 from the side of the top sheet continuous body 66; and the top sheet continuous body 66 and the back sheet The continuous body 64 is cut into a predetermined shape to form a cutting device 69 having a cutter for the sanitary napkin 1.

When the sanitary napkin 1 is manufactured by using the above-described manufacturing apparatus 50, first, a forming process of forming the sheet member 58 to be the absorbent body 4 is performed.

In the forming process, the first fiber web 51 is opened by the first fiber opening device 52, and the second fiber web 53 is opened by the second fiber opening device 54, and the fiber-opening after the fiberizing is performed. The fiber is sucked through the transfer tube 55 The cylinder 56 is attracted and laminated in the mold member 57 on the outer peripheral surface of the suction cylinder 56. Further, a nozzle 56b for spraying the water-absorptive polymer 13 is provided in the cover 56a covering the upper side of the suction cylinder 56.

At this time, the mold member 57 has a structure in which the fiber can be sucked by the suction cylinder 56 by a metal mesh or the like, and as shown in FIG. 9, has a recessed portion 57a which is further recessed toward the inner side of the suction cylinder 56. Further, as shown in Fig. 10, the fiber after the fiber opening is laminated in the mold member 57 along the bottom of the mold member 57 and the surface of the depressed portion 57a at substantially the same thickness to have a depressed portion. A sheet member 58 of a portion of the shape of 57a. In this case, the sheet member 58 is made of a cellulose-based water-absorbent fiber and a thermoplastic resin fiber, and a part of the thermoplastic resin fiber is exposed on the liquid-permeable layer side (the first surface side) when the absorber 4 is used. The first portion of the surface; the second portion exposed to the surface on the side of the liquid impermeable layer (the second surface side); and the structure connecting the connection portions of the first portion and the second portion.

Further, in the embodiment, the recessed portion 57a is gradually wedged toward the center, and the deepest portion is formed into a straight line shape. However, the shape of the depressed portion can be formed into any shape as long as the protruding portion 58a of the sheet member 58 to be described later can be formed.

Thereafter, a process of placing the sheet member 58 in the mold member 57 on the second sheet continuous body 59 moving in the conveyance direction is performed. In this case, the sheet member 58 in the mold member 57 that rotates the suction cylinder 56 is transferred to the second sheet continuous body 59 that is wound from the take-up roll 60 for the second sheet and moved in the conveyance direction MD, and is placed on the sheet. By hot melt adhesive, etc. Next in its second sheet continuum 59.

At this time, as shown in Fig. 11 (a), the sheet member 58 is a projection portion 58a which is formed to protrude upward in the recess portion 57a of the mold member 57, and is temporarily placed on the second sheet continuously. On body 59. However, as shown in Fig. 11(b), the projection 58a starts to move downward by the weight of the fiber forming the projection 58a. Finally, the sheet member 58 is collapsed as shown in Fig. 11(c). When it is removed, a folded portion in which the first surface (for example, the upper surface) of the sheet member 58 and the second surface (for example, the lower surface) on the opposite side to the first surface are alternately formed is formed.

Further, the second sheet continuous body 59 on which the sheet member 58 is placed is compressed, and the embossing process is performed. In this process, the second sheet continuous body 59 on which the sheet member 58 is placed is conveyed in the conveyance direction MD, and the sheet member 58 is compressed in the thickness direction by the compression device 61, and embossing is performed.

The compression device 61 is formed by a pair of upper and lower rollers, and is disposed on the second sheet continuous body 59 side, that is, a pin having a plurality of pins (not shown) protruding toward the outer peripheral surface on the lower side. The roller 61a has a structure in which an anvil roll 61b having a flat outer peripheral surface is disposed on the upper side.

Therefore, the second sheet continuous body 59 on which the sheet member 58 is placed is placed between the rollers 61a and 61b, and the sheet member 58 is compressed in the thickness direction including the protruding portion 58a. Further, at the same time, the second sheet continuous body 59 and the sheet member 58 are pressed from the side of the second sheet continuous body 59 by the pin of the pin roller 61a to form the embossed portions 21, 22, so that the second sheet is connected The joining of the undulating body 59 with the sheet member 58 is stronger, and the sheet member 58 caused by the embossed portions 21, 22 further enhances the strength of the absorbent body 4.

Here, when the sheet member 58 is compressed in the thickness direction, as shown in Fig. 11 (d), the folded portion due to the protruding portion 58a of the sheet member 58 is crushed and compressed, and the sheet member as a whole is almost formed. Uniform thickness. Therefore, the portion where the folded portion due to the protruding portion 58a exists is a region of high base amount, that is, a region corresponding to the second region 16 in the absorbent body 4, and the folding portion 58a of the sheet member 58 is folded. The portion other than the portion is a region having a low basis amount, that is, a region corresponding to the first region 15 in the absorber 4.

Therefore, the first region 15 and the second region 16 of the absorber 4 are substantially integrally formed by the single sheet member 58. Further, the second sheet continuous body 59, that is, the subsequent second sheet 5 is disposed so as to form the first region 15 and the second region 16 across the absorber 4.

Further, with respect to the folded portion due to the protruding portion 58a, at least a portion of the thermoplastic resin fiber is oriented in the direction of folding, so that even if the folded portion is compressed toward the thickness direction of the sheet member 58, for a part of the thermoplastic resin The fiber is in a state of being oriented in a direction corresponding to the thickness direction of the absorber 4. Therefore, in the portion corresponding to the second region 16 of the absorber 4, there is a presence of the thermoplastic resin fiber oriented in the direction corresponding to the thickness direction of the absorber 4.

Further, in the sheet member 58 as the region corresponding to the second region 16 of the absorbent body 4, since the rigidity is higher than the region corresponding to the first region 15, it is not easily compressed, so the pin of the pin roller 61a is in the sheet member. 58 enters the vicinity of the base end, and on the other hand, since the area corresponding to the first region 15 is relatively soft, the pin is elastically depressed by the pin, so that the pin is hard to enter. Therefore, in the region of the sheet member 58 corresponding to the second region 16 of the absorber 4, the depth of the embossed portion 22 becomes deeper than the embossed portion 21 of the region corresponding to the first region 15.

After the completion of the compression and embossing process, the process of forming the slit is performed. In this process, the second sheet continuous body 59 on which the sheet member 58 is placed is conveyed toward the slit forming device 62, and a slit is formed from the second sheet continuous body 59 side.

The slit forming device 62 is formed by a pair of upper and lower rollers, and is disposed on the side of the second sheet continuous body 59, that is, on the lower side, a plurality of protrusions are arranged on the outer peripheral surface in the width direction of the roller. A cutter roller 62a (not shown) has a structure in which an anvil roll 62b having a flat outer peripheral surface is disposed on the upper side.

Therefore, by inserting the second sheet continuous body 59 on which the sheet member 58 is placed between the rollers 62a, 62b, the cutting edge of the cutting roller 62a presses the second sheet continuous body 59 from the second sheet continuous body 59 side. The slits 31, 32 are formed by cutting.

At this time, in the region of the sheet member 58 corresponding to the second region 16 of the absorbent body 4, the portion of the folded portion due to the compression of the protruding portion 58a is high in rigidity, so that even the cutting roller 62a and the anvil roller 62b are loaded. When it is between, it does not deform too much in the thickness direction. Therefore, the blade of the cutter roller 62a easily enters the vicinity of the base end of the blade, so that the slit is deep. On the other hand, the sheet member 58 is in the first region corresponding to the absorber 4 Since the softness is higher than that of the second region 16, the region of 15 is placed between the cutter roller 62a and the anvil roller 62b, and is easily compressed by the blade edge of the cutter roller 62a. Therefore, compared with the case of the second region 16, the blade of the cutter roller 62a is less likely to enter the thickness direction of the sheet member 58, and a slit shallower than the slit of the second region 16 is formed.

Therefore, in the region of the sheet member 58 corresponding to the second region 16 corresponding to the absorber 4, the second slit 32 is formed deeper than the first slit 31 corresponding to the region corresponding to the first region 15.

After the slits 31 and 32 are formed, a process of cutting the second sheet continuous body 59 on which the sheet member 58 is placed into a single absorbent body is performed. In this process, the second sheet continuous body 59 on which the sheet member 58 is placed is cut into a predetermined shape by the cutting device 63 for the absorber, and the single absorbent body 4 including the second sheet 5 is formed.

After that, it is a project for a specific absorbent article (in this case, the sanitary napkin 1). In other words, the back sheet continuous body 64 wound from the take-up roll 65 for the back sheet is joined by the hot melt type adhesive or the like from the upper surface side of the absorbent body 4 being conveyed, that is, the second sheet is disposed and The surface on the opposite side of the sheet 5 is joined by a hot melt type adhesive or the like. Further, the top sheet continuous body 66 wound from the take-up roll 67 for the top sheet is joined from the second sheet side by a hot-melt type adhesive or the like, that is, by heat from the lower surface side of the absorber 4. A molten adhesive or the like is joined. Further, the top sheet continuous body 66 is joined to the absorber 4 in a state in which a side sheet continuous body (not shown) is formed on both end sides in the width direction.

Then, in the first zone of the absorber 4 by the pressing device 68 In the portion of the field 15, the top sheet continuous body 66 and the absorbent body 4 are pressed from the side of the top sheet continuous body 66 to form a plurality of press portions 25, and the top sheet continuous body 66 is absorbed by the press portions 25. The bodies 4 are joined to each other. In the embodiment, the press roll provided with the pin for press on the outer peripheral surface of the top sheet continuous body side (lower side) is provided on the side of the back sheet continuous body (upper side). Between the anvil rolls, the top surface sheet continuous body 66 and the back sheet continuous body 64 are joined to the absorber 4, and the press portion is formed. Thereby, the top sheet continuous body 66 and the absorber 4 are joined more firmly.

Finally, the top sheet continuous body 66 (including the side sheet continuous body) and the back sheet continuous body 64 are cut into a predetermined shape and size by the cutting device 69, and the sanitary napkin 1 as a product is completed.

According to the sanitary napkin having the above configuration, a part of the thermoplastic resin fiber having a longer fiber length than the cellulose-based water-absorbing fiber in the absorbent body 4 is exposed on the top sheet 2 side of the absorbent body 4. a first portion of the surface; a second portion exposed on the surface on the side of the back sheet 3; and a connecting portion connecting the first portion and the second portion. By this, the thermoplastic resin fiber can suppress the peeling of the surface on the top sheet side of the absorber 4 and the surface on the back sheet side, so that the durability of the absorber 4 can be improved.

Further, the absorber 4 has a second region 16 having a higher basis amount than the first region 15, and since the basis amount of the thermoplastic resin fibers in the second region 16 is higher than that of the first region 15, even The absorbent body 4 absorbs the excretion liquid into a wet state, and can also pass the long thermoplastic resin fiber of the fiber. The distortion of the second region 16 is stopped. Thereby, the decrease in the durability of the absorber 4 is suppressed, and the decrease in the absorption performance of the second region having a high basis amount can be suppressed.

In the embodiment described above, the absorber 4 has a structure including the second sheet 5 as the second liquid permeable layer. However, the second liquid permeable layer is not necessarily required. For example, the absorber 4 is only required for absorption. If the article has sufficient strength to withstand the conveyance of the manufacturing process, etc., it can be omitted.

Further, in the embodiment described above, the embossed portion 22 of the second region 16 of the absorber 4 is formed deeper than the embossed portion 21 of the first region 15, but the embossed portion of the first region and the second region may be formed. The depth may be arbitrarily determined, or may be the same depth, or the embossed portion of the first region may be deeper than the embossed portion of the second region. Alternatively, the embossed portions of either or both of the first region and the second region may be omitted.

In the above-described embodiment, the second slit 32 provided in the second region 16 is formed deeper than the first slit 31 provided in the first region 15 in the thickness direction of the absorber 4, but the first slit is formed. The depth of the second slit may be the same as each other, or the first slit may be formed deeper than the second slit.

In addition, when the influence of the presence of the second liquid permeable layer is small, the slit is not necessarily required to be provided, and may be omitted.

In addition, in the embodiment described above, an example of a sanitary napkin as an absorbent article will be described, and an absorbent article may be used as a disposable diaper or an incontinence pad (sanitary care). Various absorbent articles such as pads).

1‧‧‧Physical sanitary napkins (absorbent articles)

2‧‧‧Top sheet (liquid permeable layer)

4‧‧‧Acceptor

6‧‧‧Side sheet

7‧‧‧ wing

15‧‧‧1st area

16‧‧‧2nd area

25‧‧‧Squeeze

Claims (9)

An absorbent article comprising: a liquid permeable layer; a liquid impermeable layer; and an absorbent article of the absorbent body between the liquid permeable layer and the liquid impermeable layer, wherein the absorbent body is The cellulose-based water-absorbent fiber and the thermoplastic resin fiber having a longer fiber length than the cellulose-based water-absorbent fiber, wherein at least a part of the thermoplastic resin fiber in the absorbent body is exposed to the absorbent body a first portion of the surface on the liquid-permeable layer side; a second portion exposed on a surface of the absorber on the liquid-impermeable layer side; and a connecting portion connecting the first portion and the second portion, and the absorption The body includes a first region having a predetermined basis amount and a second region having a higher basis amount than the first region, and the second region is a base amount of the thermoplastic resin fiber than the first region higher. The absorbent article according to claim 1, wherein the first region and the second region of the absorbent body are integrally formed by a single sheet member, and the second region is a step of rotating the sheet member. The sheet is folded in the direction of the first surface of the sheet member and the second surface opposite to the first surface, and is formed by compressing the folded portion in the thickness direction of the sheet member. The absorbent article according to the first or second aspect of the invention, wherein the absorbent body has a tensile strength in a thickness direction of 100 Pa or more. The absorbent article according to claim 1 or 2, wherein the absorbent body includes an embossed portion formed by embossing the absorbent body in a thickness direction, and an embossed portion of the second region. It is deeper than the embossed part of the first area. The absorbent article according to the first or second aspect of the invention, wherein the absorbent body and the liquid permeable layer are pressed from the liquid permeable layer side by the absorbent body and the liquid permeable layer. The formed press sections are joined to each other, and the press section is provided in the first region. The absorbent article according to the first aspect of the invention, wherein the absorbent body is provided on the liquid permeable layer side or the liquid permeable layer side The second liquid permeable layer to which the region and the second region are attached. The absorbent article according to claim 6, wherein the absorbent body is provided to penetrate the second liquid permeable layer in a thickness direction of the second liquid permeable layer, and does not reach and attach the second a plurality of slits on the surface opposite to the surface of the liquid permeable layer, wherein the second slit provided in the second region among the slits is the first slit provided in the first region in the absorber The thickness direction is deeper. The absorbent article according to the first aspect of the invention, wherein the absorbent body is provided with a portion in which the thermoplastic resin fiber is oriented in a thickness direction of the absorbent body in the second region. The absorbent article according to the first or second aspect of the invention, wherein the absorbent body has the same maximum thickness of the first region and the second region.