JP2002345888A - Absorbing article and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbing article in which an absorber, a bulge height of which on a middle higher part is raised without raising the total thickness, is used and which accelerates the diffusion of the absorbed menstrual blood and so on, increases the absorbing ability and prevents the reversion. SOLUTION: In the absorbing article in which an absorber 4 lies between a liquid permeable surface sheet 3 and a liquid impermeable back sheet 2, the thickness of the middle higher part 6 on a part of the absorber 4 is increased to the surface side from the standart part absorber 4A, and moreover, a U-shaped gap 8 for preventing leakage is formed outside of the middle higher part 6 at least in a field K for discharged body fluid, the gap 8 lain at a prescribed distance from the flank of the middle higher part 6 is formed in the distance between the gap 8 and the middle higher part 6 in the shape of a stage so as to be thicker than the absorber in the gap for preventing leakage ad thinner than the standard part absorber 4A, and a compressed absorbing domain 7 whose absorber density is lower than that of the gap 8 and higher than that of the middle higher part 6 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to menstrual blood, vaginal discharge,
The present invention relates to absorbent articles such as sanitary napkins, panty liners, incontinence pads, etc. for absorbing urine and the like, and in particular, can make the middle and high parts of an absorbent body stand out and promote the diffusion of menstrual blood and vaginal discharge. The present invention relates to an absorbent article in which the absorption capacity is prevented from increasing and reversing, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, there has been provided an absorbent article in which a part of an absorbent body is protruded toward a use surface side (hereinafter, referred to as a middle and high part) to improve fit and prevent liquid leakage. . As a method of forming the middle and high parts, there is a method of forming a middle and high part by stacking more pulp on a part of the absorbent body than the other when stacking the pulp, and a method of thickly and uniformly stacking the entire absorber and then pressing To form a middle and high part.

Further, in order to maintain the shape of the middle and high portions and to block menstrual blood and the like absorbed by the absorber, linear embossing is performed around the middle and high portions (hereinafter referred to as fit embossing). It is also performed to form a concave leak-proof groove.

[0004]

However [0007], the absorber having the domed section, as shown in FIG. 10, middle and high raised height h ₁ is normally on the surface side of the standard portion absorber 50 of the basic thickness h ₀ and forms a cross-sectional shape having a section 51, if desired tentatively raised ridge height h ₁ of the domed section the raised height h ₂ as shown by a chain line, the total thickness H ₁ of course absorber basic It becomes a thickness obtained by adding a raised height h ₂ in the thickness h _0, so that the absorbent body is thick increase.

[0005] Further, if menstrual blood and the like discharged to the middle and high section 51 are not diffused much, many menstrual bloods and the like will be unevenly distributed in the area shown by oblique lines in FIG. However, there is a problem that reversal is likely to occur.

[0006] On the other hand, in Japanese Patent Application Laid-Open No. 11-33054, a pulp is squeezed and deformed with a fit emboss in the shape of a medium-high shape to form a medium-high part, and a leak-proof around the medium-high part is obtained. It is described that a groove is provided. However, since the height difference between the upper surface of the middle and high portions and the bottom surface of the leakage prevention groove is increased, the surface material may be broken. Also, in order to maintain the molded shape, a measure such as applying high pressure to the entire absorber and solidifying it, or melting and solidifying a part of the surface material is taken, and the absorber becomes harder, or Since a part of the surface material is hardened, a problem such as deterioration of the touch occurs.

Therefore, a main object of the present invention is to increase the height of the middle and high parts without increasing the total thickness of the absorber, and to promote the diffusion of absorbed menstrual blood and the like to increase the absorption capacity. It is an object of the present invention to provide an absorbent article and a method of manufacturing the absorbent article, which have the advantage that they can prevent back-up and return, and that even if there is a height difference between the upper surface of the middle and high portions and the bottom surface of the leakage preventing groove, the surface material is not broken.

[0008]

According to a first aspect of the present invention, there is provided a liquid-permeable topsheet comprising:
An absorber is interposed between the liquid-impervious back sheet, and a part of the absorber has a middle and high part which is thickened on the surface side, and is concave at least in the body fluid discharge part region outside the middle and high part. In the absorbent article having the leak-proof groove formed therein, the leak-proof groove is separated from the side of the middle and high section by a predetermined distance, and the leak-proof groove is absorbed in a space between the leak-proof groove and the middle and high section side. It is formed thicker than the body and thinner than the standard part of the absorber, and has a squeezed absorber region with a lower density than the leak-proof groove portion absorber and a higher density than the middle-high portion absorber. An absorbent article is provided.

According to a second aspect of the present invention, an absorber is interposed between the liquid-permeable top sheet and the liquid-impermeable back sheet, and a part of the absorber is thickened on the front side. In an absorbent article having a middle and high section, and at least a concave leakage prevention groove formed outside the middle and high section in the body fluid discharge area, the leakage prevention groove is separated by a predetermined distance from a side of the middle and high section, The gap between the leak-prevention groove and the middle-high portion side portion is formed so as to be continuous from the bottom portion of the leak-prevention groove and gradually increase in the thickness of the absorber toward the middle-high portion. An absorbent article characterized by forming a squeezed absorber region having a density lower than that of the body and a density higher than that of the middle-high portion absorber.

According to a third aspect of the present invention, the width of the compressed absorber region is at least 2 mm or more.
An absorbent article according to any of the above is provided.

According to a fourth aspect of the present invention, the height difference between the bottom surface of the leakage preventing groove and the upper surface of the compressed absorber region is 0.1
The absorbent article according to any one of claims 1 and 3, wherein the absorbent article has a thickness of about 3.0 mm.

According to a fifth aspect of the present invention, there is provided the absorbent article according to any one of the first to fourth aspects, wherein a difference in squeezing is provided on the bottom surface of the leakage preventing groove in an uneven shape along the direction of the leakage preventing groove. Provided.

[0013] The present invention according to claim 6 is characterized in that:
5. The method for producing an absorbent article according to any one of 5), wherein the absorbent article is laminated so that a part of the absorbent body has a middle-high portion thickened on the surface side, and then a liquid-permeable surface sheet is laminated on the surface side. Then, a method for producing an absorbent article is provided, wherein the leak-proof groove and the compressed absorber region are simultaneously formed by embossing from the liquid-permeable topsheet side with a pressure embossing roll.

According to a seventh aspect of the present invention, the middle high side edge of the convex portion for forming the compressed absorbent region formed on the pressure embossing roll is placed in the middle high portion in a state after the absorbent is stacked. 7. The absorbent article according to claim 6, wherein embossing is performed outside the upper surface and in accordance with the inside of the inclined surface of the middle and high part or the substantially lower end position of the inclined surface to form the compressed absorbent region. Is provided.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a partially cutaway plan view of an absorbent article 1A according to the present invention, and FIG. 2 is a view taken along line II-II of FIG. 1 schematically showing only an absorber shape.

The absorbent article 1A is mainly used for applications such as panty liners, sanitary napkins, vaginal discharge sheets, incontinence pads and the like. For example, as shown in FIG. 2 and a liquid-permeable topsheet 3 (hereinafter, also simply referred to as a topsheet), the absorber 4 or, as shown in the figure, the absorber 4 and the crepe paper 5 surrounding it. It has a structure in which the absorber unit 6 is interposed. Around the absorber 4, the liquid-impermeable back sheet 2 and the liquid-permeable top sheet 3 are joined by an adhesive means such as a hot melt adhesive.

The liquid-impervious back sheet 2 is made of a sheet material having at least water-blocking properties, such as polyethylene or polypropylene. In addition, a laminated non-woven fabric obtained by laminating a non-woven fabric on a polyethylene sheet or the like, or a waterproof film is also used. A non-woven fabric sheet (in this case, a liquid-impermeable back sheet is composed of a waterproof film and a non-woven fabric) may be used after substantially impermeable to liquid is interposed therebetween. In recent years, a material having moisture permeability tends to be suitably used from the viewpoint of preventing stuffiness. The water-permeable and moisture-permeable sheet material is a microporous material obtained by melting and kneading an inorganic filler in an olefin-based resin such as polyethylene or polypropylene to form a sheet, and then stretching the sheet uniaxially or biaxially. Sheets are preferably used.

The absorber 4 may be any as long as it can absorb and hold bodily fluids. Usually, a mixture of fluffy pulp and absorbent polymer powder is preferably used in terms of absorption function and cost. You. Examples of the pulp include chemical pulp obtained from wood, cellulose fibers such as molten pulp, and those made of artificial cellulose fibers such as rayon and acetate. It is preferably used in terms of price. It is desirable that the absorber 4 be surrounded by crepe paper 5 in order to maintain its shape and promptly diffuse menstrual blood and the like, and prevent the menstrual blood and the like once absorbed from returning. Further, the planar shape of the absorber 4 may be an oval shape as shown, or may be a fit cut shape (a gourd shape) in order to ease the contact with the crotch portion.

On the other hand, as the topsheet 3 in the absorbent article 1A, a non-porous or perforated nonwoven fabric or a porous plastic sheet is preferably used. Examples of the material fibers constituting the nonwoven fabric include synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, polyamides, and the like, recycled fibers such as rayon and cupra, and natural fibers such as cotton. Also,
Composite fibers such as a core-sheath fiber, a side-by-side fiber, and a split fiber having a high melting point fiber as a core and a low melting point fiber as a sheath can also be suitably used.

As the processing method, a nonwoven fabric obtained by an appropriate processing method such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, and a needle punch method can be used. Among these processing methods, the spunlace method is excellent in that it is rich in flexibility and drapability, and the thermal bond method is excellent in that it is bulky and soft. In addition, a nonwoven fabric made of synthetic fibers is preferably used in that embossing is easily performed.

As shown in FIG. 2, on the surface side of the absorber 4, a part of the absorber 4 is
(A general part other than the leak-proof groove 8 and the squeezing absorber region 7 to be described later) has a middle and high part 6 which is thicker on the surface side, and at least in the body fluid discharge part region K.
Is formed with a concave leak-proof groove 8 outside. The leak-proof groove 8 is spaced outward by a predetermined distance from the side portion P of the middle-high portion 6, and between the leak-proof groove 8 and the middle-high portion side portion P is thicker than the leak-proof groove portion absorber. The compressed absorber region 7 is formed thinner and stepped than the standard portion absorber 4A, and has a lower density than the leakproof groove absorber and a higher density than the middle and high portion absorber.

The present absorbent article 1A configured as described above
In the above, since the compressed absorber region 7 which is thinner than the standard portion absorber 4A is formed in the peripheral region of the middle and high portion 6, the raised height of the middle and high portion 6 is set to the distance from the upper surface of the compressed absorber region 7 to the upper surface of the middle and high portion 6. be a h _2, without increasing thickness the total thickness H of the absorbent member 4, the dimensions h ₁ (normal from the top surface of the standard portion absorber 4A to domed portion 6 upper surface and the h ₁ dimension ridge height ), Which makes it possible to make the middle and high section 6 stand out.

Further, the density (fiber density of the absorber) of the leak preventing groove 8, the compressed absorber region 7 and the middle and high section 6 is the highest in the leak preventing groove 8, and the density of the compressed absorber region 7 is higher. The body is relatively taller than the absorber in the mid-high section 6.
As a result, the body fluid 9 such as menstrual blood discharged to the middle and high section 6 is diffused to the squeezing absorber region 7 side, so that the absorption capacity can be increased, and the body fluid can be prevented from being returned by diffusion. . The body fluid 9 that has moved by diffusion to the squeezing absorber region 7 is blocked at the position of the leakage preventing groove 8 and does not move any more laterally.

Further, as will be described later, the leak preventing groove 8 and the compressed absorber region 7 are formed by embossing the liquid-permeable topsheet 3 from the side of the liquid-permeable top sheet 3 by a press embossing roll 10, and the middle and high portions 6 and the leak preventing groove are formed. Since the compressed absorber region 7 serving as an interference band exists between the top sheet 8 and the front sheet 8, the top sheet 3 can be prevented from being torn at the same time when embossing is applied.

The groove width S ₁ of the leak preventing groove 8 is ₁ to 5 mm, preferably 2 to 3 mm. If the groove width S1 is less than ₁ mm, the original purpose of the leak-proof groove is to prevent the spread of menstrual blood and to prevent the function of preventing leakage by fixing the absorber. Furthermore, proof groove width S ₁ is solidified in the case of more than 5mm Momizo 8
Due to the rigidity of the absorbent body, hardness appears in the absorber 4, and the wearing feeling is impaired.

The width S ₂ of the compressed absorber region 7 is at least 2 mm or more, preferably 5 mm or more. If there is no area of at least 2 mm or more, it is difficult to make the middle and high section 6 stand out, and an actual fitting effect cannot be expected. The maximum dimension of the width dimension S ₂ is approximately 2
It is less than 5 mm, preferably less than 20 mm.

The height difference h ₃ between the bottom surface of the leakage preventing groove 8 and the upper surface of the compressed absorber region 7 is preferably 0.1 to 3.0 mm, more preferably 0.3 to 1.0 mm. Height difference h ₃
Is less than 0.1 mm, the leak-proof groove 8 and the compressed absorber region 7
Is not clear, and only one function of the function of highlighting the middle and high section 6 and the function of diffusing body fluid can be performed.
Further, if the height difference h ₃ exceeds 3.0 mm, it may cause breakage in the surface sheet 3 during embossing imparting undesirable.

The width of the domed portion 6, taking into account the average size of the crotch width of the women, 15 to the upper surface width D _U of the domed section 6
It is preferable to set the bottom width D _L of the middle and high section 6 to 20 to 60 mm.

In order to form the leak-proof groove 8 and the compressed absorber region 7 in the absorber 4, as shown in FIG. 3, a liquid-permeable surface is provided on the upper surface side of the absorber 4 conveyed on the line. After laminating the sheets 3, it is desirable that the pressure embossing roll 10 and the anvil roll 11 be formed simultaneously by passing them through an embossing device 12 which is arranged facing each other with a predetermined gap.

The press embossing roll 10 has, as shown in detail in FIG. 4, one or a plurality of convex portions 13 corresponding to the shape of the leak-proof groove 8 and the compressed absorber region 7 on the roll surface. A pressure roll is used. in this case,
The convex portion 13 is formed by integrally forming a convex portion 13A for forming a leakage preventing groove and a convex portion 13B for forming a compressed absorber region. The temperature of the pressure embossing roll 10 depends on the melting point and the pressing time of the liquid-permeable surface sheet 3, but is preferably 50 to 200 ° C. under the condition that the liquid-permeable surface sheet 3 is not melted and solidified. Preferably 60-
The temperature is preferably set to 150 ° C.

As shown in FIG. 5A, the longitudinal shape of the leakage preventing groove forming projection 13A may be a flat projection along the direction of the leakage preventing groove. As shown in B), the unevenness may be provided, and an uneven pressing difference may be provided on the bottom surface of the leakage preventing groove 8. In the case where an uneven compression difference is provided, the bodily fluid that flows along the topsheet 3 and flows into the leak-proof groove 8 is quickly absorbed from the high-density compressed portion side where the density is high.

On the other hand, the embossing position is formed on the pressure embossing roll 10 as shown in FIG. 6 in order to make the middle and high section 6 stand out and to prevent the absorber of the middle and high section 6 from hardening. Squeezing absorber region forming projection 13B
Of the domed section I side edge R _I, in the state of the product繊後absorber, an outer than the domed section 6 top, and to impart an embossed in accordance with the position of the inclined surface of the domed portion 6 Is desirable.
Further, the domed section of the I side edge R _I an outer than the domed section 6 top, and may be given an embossed in accordance with the lower end position of the inclined surface.

In the above example, the leak preventing groove 8 and the squeezed absorber region 7 are formed in a stepped shape, but as shown in FIG.
The absorber may be formed so as to be continuously inclined from the bottom portion, that is, to gradually increase the thickness of the absorber toward the middle-high portion 6 side. The convex shape 1 of the pressure embossing roll 10 in this case
3 'has a shape shown in FIGS. 8A and 8B. In the figure, (A) shows a convex shape when the squeezing absorber region 7 is formed continuously and inclined from the bottom of the leak-proof groove 8,
(B) shows a convex shape in the case where an uneven pressing difference is provided along the embossing direction.

By the way, in the above-described example of the absorbent article, the squeezed absorbent region 7 is formed on both sides of the middle and high section 6 and has a substantially uniform width along the longitudinal direction. However, as shown in FIG. The squeezing absorber region 7 may be formed only in the side region including the region K. Absorbent article 1B shown in FIG.
Other structures are the same as those of the absorbent article 1A of FIG.

[0035]

As described in detail above, according to the present invention, it is possible to increase the height of the middle and high portions without increasing the total thickness of the absorber, and to promote the diffusion of absorbed menstrual blood and the like. It is possible to prevent an increase in absorption capacity and reversion. Furthermore, even if there is a difference in height between the upper surface of the middle and high portions and the bottom surface of the leakage preventing groove, there is an advantage that the squeezed absorber region formed in the middle serves as an interference band to prevent the surface material from being broken.

[Brief description of the drawings]

FIG. 1 is a partially broken plan view of an absorbent article 1A according to the present invention.

FIG. 2 is a schematic view showing only the shape of the absorber, taken along the line II-II in FIG.
FIG.

FIG. 3 is a schematic view showing a procedure for forming a leakage preventing groove 8 and a compressed absorber region 7;

FIG. 4 is a view taken in the direction of arrows IV-IV in FIG. 3;

FIGS. 5A and 5B are diagrams illustrating examples of shapes of convex portions 13A and 13B formed on a pressure embossing roll 10. FIG.

FIG. 6 is a view showing a formation position of a squeeze absorber region 7;

FIG. 7 is a cross-sectional view of a main part of an absorbent body, showing another example of a form of forming the compressed absorbent region 7.

FIGS. 8 (A) and (B) are diagrams each showing an example of the shape of a convex portion for forming another example of the squeezed absorber region 7. FIG.

FIG. 9 is a partially cutaway plan view of the absorbent article 1B showing another form of forming the leakage preventing groove 8 and the compressed absorber region 7.

FIG. 10 is a schematic cross-sectional view of an absorber showing a conventional middle and high section forming procedure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Absorbent article, 2 ... Liquid impervious back sheet, 3 ... Liquid permeable top sheet, 4 ... Absorber, 5 ... Crepe paper, 6 ... Middle and high part, 7 ... Compressed absorber area, 8 ... Leak-proof groove , 10 ... Pressing embossing roll, 11 ... Anvil roll

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) A61F 13/534 A61F 13/18 302 (72) Inventor Masaya Fujita 151-2 Atsuhara, Fuji-shi, Shizuoka Pref. Daiosaani Tally Products Co., Ltd. F term (reference) 3B029 BA03 BF03 4C003 AA03 AA04 AA07 DA04 GA02 HA05 HA06 4C098 AA09 CC05 CE06 DD10 DD16 DD24 DD25 DD26 DD28 DD30

Claims (7)

[Claims] An absorber is interposed between a liquid-permeable top sheet and a liquid-impermeable back sheet, and a part of the absorber has a middle and high part which is thickened on the front surface side. In an absorbent article in which a concave leak-proof groove is formed outside the middle and high section in the body fluid discharge section area, the leak-proof groove is separated from a side of the middle and high section by a predetermined distance, and the leak-proof groove and the middle and high section In a region separated from a side portion, the leakage prevention groove portion is formed thicker and thinner than a standard portion of the absorber in a stepped manner, and has a lower density than the leakage prevention groove portion absorber and the middle and high section absorber. An absorbent article, wherein a squeezed absorbent region having a higher density is formed. 2. An absorber is interposed between a liquid-permeable top sheet and a liquid-impermeable back sheet, and a part of the absorber has a middle and high part which is thickened on the front side. In an absorbent article in which a concave leak-proof groove is formed outside the middle and high section in the body fluid discharge section area, the leak-proof groove is separated from a side of the middle and high section by a predetermined distance, and the leak-proof groove and the middle and high section Continuing from the bottom of the leak-proof groove in the area separated from the side portion, and formed by gradually increasing the absorber thickness toward the middle and high part side, and at a lower density than the leak-proof groove portion absorber and An absorbent article, wherein a squeezed absorber region having a higher density than that of the middle and high absorber is formed. 3. The squeezing absorber region has a width of at least 2 mm.
The absorbent article according to any one of claims 1 and 2, which is as described above. 4. The height difference between the bottom surface of the leak-proof groove and the top surface of the squeezing absorber region is 0.1 to 3.0 mm.
The absorbent article according to any one of the above. 5. The absorbent article according to claim 1, wherein a pressing difference is provided on the bottom surface of the leakage preventing groove in an uneven shape along the direction of the leakage preventing groove. 6. The method for producing an absorbent article according to claim 1, wherein the absorbent body is laminated so that a part of the absorbent body has a middle and high part which is thickened on the surface side, and then the absorbent body is laid. Characterized in that the leak-proof groove and the compressed absorber region are simultaneously formed by embossing from the liquid-permeable surface sheet side with a pressure embossing roll. Article manufacturing method. 7. A middle-high portion of the convex portion for forming the compressed absorbent region formed on the pressure embossing roll is located outside the upper surface of the middle high portion in a state after the absorbent body is stacked. 7. The method for manufacturing an absorbent article according to claim 6, wherein the compressed absorbent region is formed by embossing in accordance with the inside of the inclined surface of the middle and high portion or the substantially lower end position of the inclined surface.