JP3865565B2 - Absorbent article with high pre-leakage prevention effect - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sanitary napkin, a panty liner, an incontinence pad, and the like for absorbing menstrual blood, cages, and the like, and particularly to an absorbent article having a high effect of preventing a front leak.
[0002]
[Prior art]
Conventionally, as absorbent articles such as panty liners, sanitary napkins, and incontinence pads, liquid-permeable back sheets such as polyethylene sheets or polyethylene sheet laminated nonwoven fabrics, and liquid-permeable tops such as nonwoven fabrics or liquid-permeable plastic sheets A sheet in which an absorbent body made of cotton-like pulp or the like is interposed between the sheet and the sheet is known.
[0003]
Many improvements have been made to this type of absorbent article, and it has a structure that can efficiently absorb body fluid etc. according to the posture state of the wearer, such as a wearing time zone, that is, a sleeping time zone and a rising time zone. Various proposals have been made. For example, in Japanese Patent Application Laid-Open No. 2-144059, the compression rigidity is 15 to 38% between the surface material and the absorbent body and the dry compression recovery rate is at the center in the rear side width direction of the absorbent article. An absorbent article in which an elastic body of 25% or more is present to prevent after-leaking at bedtime is disclosed, and in Japanese Patent Laid-Open No. 9-28729, as shown in FIG. There is disclosed a sanitary napkin in which a cushion layer 51 is provided over the entire width on the upper surface side of the rear end portion, and menstrual blood is prevented from leaking to the rear side through a rupture at bedtime.
[0004]
[Problems to be solved by the invention]
However, if the posture of the bedtime is always on its back, the absorbent article with the above structure can prevent menstrual leakage, but it can be caused by a woman who has a habit of sleeping in a sideways or prone state, In the case of a sideways or prone state, menstrual leakage could not be prevented. That is, because of the structure of the human body, the direction of the blood drainage port is obliquely upward in the supine state, so menstrual blood is difficult to emerge in the supine state, and even if there is blood drainage, It is absorbed by the long absorber on the rear side. However, in the prone or sideways posture, the direction of the blood drainage port is downward or horizontal, so menstrual blood is easily drained, and the position of the absorber is not considered for pre-leakage. Some menstrual leaks occurred.
[0005]
On the other hand, even during daytime action hours, the seating posture and the standing posture are frequently repeated. According to the investigation by the present inventors, in order to deal with such a front leak, women and the like have individually dealt with the crotch part of the underwear by attaching them to the front. In order to prevent wear and leakage of articles, many of the articles are designated with a half-mounting position with respect to the underwear, such as with wings or fit cuts, and the above-mentioned measures cannot be taken.
[0006]
Then, the main subject of this invention is providing the absorbent article which can prevent the front leak reliably.
[0007]
[Means for Solving the Problems]
According to the present invention for solving the above problems, an absorbent body is interposed between a liquid-permeable top sheet and a liquid-impervious back sheet, and a middle-high part is formed along the longitudinal direction at the center in the width direction. In absorbent articles,
A bulky convex part is formed on the front part of the absorbent body under the condition that the front end side position is the end of the body fluid discharge port corresponding part, and the longitudinal direction of the absorbent article is between the front end edge of the middle and high part. A damming groove having a width of at least 7 mm or more is formed on the direction center line.
[0008]
In this case, the bulky projections, it is desirable dimension of the absorbent body width direction is at least 20mm or more, the bulky protrusion boundary, to form a partial or linear embossed over substantially the entire width It is desirable to be. Furthermore, it is desirable that the bulky convex portions, are then erected to the ship target shape.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0010]
[First embodiment]
1 is a development view of a sanitary napkin 1A according to a first embodiment of the present invention, FIG. 2 is a view taken along the line II-II in FIG. 1, and FIG. 3 is a view taken along the line III-III in FIG. 4 is a view taken along the line IV-IV in FIG.
[0011]
The sanitary napkin 1A includes a liquid-impermeable back sheet 2 made of a polyethylene sheet or the like, a liquid-permeable top sheet 3 that allows permeation of menstrual blood or cage, etc., and an intervening space between the two sheets 2 and 3. Absorbent body 4 made of cotton-like pulp or synthetic pulp, etc., crepe paper 5 surrounding the absorbent body 4 for maintaining the shape and improving diffusibility of the absorbent body 4, and the liquid-permeable top sheet 3 Middle and high portions 12 formed along the longitudinal direction at the center in the width direction by the fiber assembly 6 having hydrophilicity interposed between the absorber 4 and both side edges of the absorber 4 as standing base ends , And at least a pair of left and right three-dimensional gathers 7 and 7 provided to protrude from the surface side in a predetermined section in the front-rear direction from the blood discharge port corresponding part, and around the absorber 4, Up and down At the edge, the outer edge of the liquid-impervious backsheet 2 and the liquid-permeable topsheet 3 is joined by an adhesive such as hot melt or an adhesive means such as heat seal. Further, the liquid-impermeable back sheet 2 extending laterally and the nonwoven fabric 10 forming the three-dimensional gather 7 are joined together by an adhesive such as hot melt or an adhesive means such as heat seal. The first wings 8, 8 projecting sideways are formed by the composite sheet portion of the liquid-permeable backsheet 2 and the three-dimensional gather forming nonwoven fabric 10, and the second wing is located on the back side from this. In the present invention, a relatively bulky convex portion 11 is formed in the front portion of the absorber 4 in order to prevent the front leakage.
[0012]
Hereinafter, the structure of the sanitary napkin 1A will be described in detail. As the liquid-impermeable back sheet 2, a sheet material having at least water shielding properties such as polyethylene is used. It has a tendency to be used. The water- 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 in a uniaxial or biaxial direction. A sheet is preferably used.
[0013]
Next, the liquid-permeable top sheet 3 is preferably a porous or non-porous nonwoven fabric or a porous plastic sheet. The non-woven fabric material fibers can be synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, natural fibers such as cotton, and spunlace. A nonwoven fabric obtained by an appropriate processing method such as a method, a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft.
[0014]
When a large number of through holes are formed in the liquid permeable top sheet 3, menstrual blood, venom, etc. (hereinafter collectively referred to as body fluid) are quickly absorbed, and the dry touch property is excellent. It will be a thing.
[0015]
The absorbent body 4 is not particularly limited as long as it can absorb and retain bodily fluids. Usually, a fluffy pulp mixed with a water-absorbing polymer powder is preferably used from the viewpoint of the absorption function and cost. The absorbent body 4 is preferably surrounded by a crepe paper 5 in order to maintain its shape, and the width direction is determined by a hydrophilic fiber assembly 6 interposed between the absorbent body 4 and the liquid-permeable top sheet 3. A middle-high portion 12 is formed in the central portion along the longitudinal direction. Examples of the hydrophilic fiber assembly 6 include cellulose fibers such as wood pulp, cotton and rayon, synthetic fibers having a hydrophilic group such as acrylonitrile and polyvinyl alcohol, and hydrophobic fibers such as polyethylene, polypropylene and polyester. Various types of fibers such as fibers imparted with hydrophilicity by surface treatment with a hydrophilizing agent can be used.
[0016]
On the surface of the liquid-permeable top sheet 3, linear embosses 14 to 17 are formed to hold the middle and high portions 12 in a predetermined position, to bulge tightly on the surface side, and to contain absorbed body fluid. ing. The linear embossing 14 is formed continuously from both sides of the semicircular arc-shaped embossing formed on the bulky convex portion 11 at the front end portion of the absorber, and protrudes inward in a planar manner on both sides of the middle-high portion 12. It is an arc-shaped side embossing, the linear embossing 15 is an embossing formed along the front end side part of the middle and high part 12, and the linear embossing 16 protrudes inward in a plane formed outside the side embossing 14. Arc-shaped side embossing. Furthermore, the linear embossing 17 is an embossing formed along both sides of the middle-high portion 12 on the absorber rear portion side.
[0017]
On the other hand, the width dimension of the liquid-permeable top sheet 3 is slightly longer than the width of the absorbent body 4 and covers the absorbent body 4 as shown in the cross-sectional views of FIGS. The three-dimensional gather 7 prevents the penetration of the non-woven fabric 10 for gathering different from the liquid-permeable top sheet 3, specifically menstrual blood or the like, or enhances the feeling of touch. Depending on the purpose, a nonwoven fabric material subjected to appropriate water repellent treatment or hydrophilic treatment is used. As the gather forming nonwoven fabric 10, natural fibers, synthetic fibers, regenerated fibers, or the like can be used, and those formed by an appropriate processing method can be used. In order to prevent this, it is preferable to use a non-woven fabric with reduced basis weight and air permeability. Specifically, it is desirable to use a nonwoven fabric prepared with a basis weight of 18 to 23 g / m2, and in order to reliably prevent the permeation of body fluids, silicon-based, paraffin-based, alkylchromic chloride-based water repellents, etc. A coated water repellent nonwoven fabric is preferably used.
[0018]
As shown in FIGS. 2 and 3, the gather forming nonwoven fabric 10 has an outer portion of the liquid-impervious backsheet 2 slightly outside the widthwise intermediate portion and slightly beyond the absorber side edge from the inner position of the absorber 4. Adhering with an adhesive such as hot melt over the range up to and including the laminated sheet portion of the gather forming nonwoven fabric 10 and the liquid-impermeable back sheet 2, the absorber side portion position substantially corresponding to the body fluid discharge port A pair of left and right first wings 8 and 8 are formed, and second wings 9 and 9 are formed at the collar side position. Adhesive portions (not shown) are provided on the outer surface side of the first wings 8 and 8 and the second wings 9 and 9, as shown in FIG. Folded to the side, wrapped around the crotch part of the shorts and fastened.
[0019]
On the other hand, the inner part of the non-woven fabric 10 for gathering is folded almost double, and inside this double sheet, both ends or a suitable position in the longitudinal direction is fixed at the middle in the height direction. A member 19 is provided, and a tape-like elastic expansion / contraction member 18 is disposed on the upper portion of the thread-like elastic expansion / contraction member 19 at both ends or at appropriate positions in the longitudinal direction. As shown in FIG. 3, the double sheet portion is folded and laminated in a Z-shaped cross section at the front and rear end portions, and is bonded to the absorbent body 4 side, whereby the thread elastic elastic member 19 is disposed. As the bending points, three-dimensional gathers 7, 7 standing on the surface side are formed while forming pockets P, P with openings inward in a cross-sectional shape.
[0020]
In the sanitary napkin 1A, in order to prevent the pre-leakage in particular, as shown in detail in FIG. 4, the front end portion of the absorbent body 4 is spaced apart from the front end edge of the middle-high portion 12 so as to be bulky. The bodily fluid blocking groove 13 is formed by forming the convex portion 11. The bulky convex portion 11 is formed by laminating a bulky forming material 21 having or not having hydrophilicity on the upper surface side of the absorbent body 4 in the illustrated example. Surface treatment of cellulose fibers such as wood pulp, cotton and rayon, hydrophilic fibers having a hydrophilic group such as acrylonitrile and polyvinyl alcohol, hydrophobic fibers such as polyethylene, polypropylene and polyester, and these hydrophobic fibers with a hydrophilizing agent Various types of fibers, such as fibers with hydrophilicity, can be used, but in addition to this, cushion materials such as crepe paper, laminates of papers, flexible sponges made of resin foam, etc. are also used. can do. When the bulky forming material 21 has hydrophilicity, it not only dams bodily fluids, but also exhibits a pre-leakage preventing effect by absorbing it, and even when it does not have hydrophilicity, it adheres to the body to form a gap. To eliminate the pre-leakage effect.
[0021]
In forming the bulky convex portion 11, the inner boundary line 22 is formed in a curved shape protruding outward, and is adjusted upright in a shipboard shape (obliquely upper side) by adjusting the adhesive portion with the gather forming nonwoven fabric 10. It is desirable to do so.
[0022]
The bulky convex portion 11 is formed in the front portion of the absorbent body 4 under the condition that the front end side of the body fluid discharge port corresponding portion H is the end end. If it is formed in the section until reaching the body fluid discharge port correspondence H, the pre-leakage is the same as that of the conventional product, and a blocking effect cannot be expected. The minimum dimension value (BL) of the bulky convex portion 11 is not particularly defined, but if the contact width with respect to the body is small, it may become impossible to follow the movement of the body and a gap may be formed. It is said to be about. Note that the front end of the bulky convex portion 11 does not have to coincide with the edge of the flange.
[0023]
Further, the dam groove 13 has a section width (ML) of at least 7 mm or more from the end of the bulky convex portion 11 toward the center side of the sanitary napkin 1A and on the longitudinal center line CL of the absorbent article. As shown in FIG. 4, even if the discharged body fluid flows down to the front side, the body fluid flows into the groove due to the presence of the blocking groove 13, and exceeds the bulky convex portion 11. There will be no leakage. When the width ML of the dam groove 13 is less than 7 mm, the bulky convex portion 11 may be substantially continuous with the middle-high portion 12 due to the bending condition, twisting, drooping, etc. 11 is not preferable. As the width dimension of the bulky convex portion 11, in the illustrated example, it is formed to be approximately the same as the width of the absorbent body 4, but it may be shorter than the width of the absorbent body 4. However, the width dimension is desirably at least 20 mm or more. When the width dimension of the bulky convex portion 11 is less than 20 mm, a certain amount of gap may be formed on both sides of the bulky convex portion 11, so even if there is a body fluid that reaches the bulky convex portion 11 while eliminating the gap. The width should be at least 20 mm so that it can be absorbed.
[0024]
On the other hand, embossed wires 14 and 15 (see FIG. 4) are provided at the boundary between the bulky convex portion 11 and the dam groove 13 and at the boundary between the dam groove 13 and the middle high portion 12, that is, at the boundary of the dam groove 13. It is desirable to form a level difference exactly. By clarifying the level difference, the body fluid surely flows down into the damming groove 13 and the body fluid once flowing into the damming groove 13 does not leak over the bulky convex portion 11 again. It will be possible to prevent pre-leakage. In the illustrated example, the heights of the bulky convex portion 11 and the middle-high portion 12 are substantially the same, but the heights of both may be different. That is, the bulky convex portion 11 may be higher than the middle high portion 12, or the middle high portion 12 may be higher than the bulky convex portion 11.
[0025]
[Reference Example 1]
By the way, as a formation aspect of the bulky convex part 11, after forming the range containing the bulky convex part 11 by the absorbent body 4 which consists of cotton-like pulp or synthetic pulp, as FIG.5 (A) shows, The dam groove 13 may be formed by compressing the dam groove corresponding portion 4a. In this case, the bulky convex portion 11 and the general portion 4B of the absorbent body 4 may have the same thickness or may be different. Further, as shown in FIG. 5 (B), separate absorbent bodies 4D and 4E may be laminated on the upper surface side of the base layer absorbent body 4C to form the bulky convex portions 11 and the mid-high portions 12 respectively. .
[0026]
Furthermore, the dam groove 13 may be formed by simply embossing the absorbent body 4 without forming the bulky convex portion 11 in particular. For example, in the example shown in FIG. 6, with respect to the absorbent body 4 having a substantially uniform thickness, the absorbent body 4 is positioned on the front side of the body fluid discharge port corresponding part H on the longitudinal center line CL of the absorbent article. 7 is an example in which a substantially gourd-shaped emboss 23 is formed so that a blocking groove 13 having a section width ML of at least 7 mm or more is formed. The example of the absorbent shown in FIG. In the substantially width direction of the absorbent body 4, the dam groove 13 having a section width ML of at least 7 mm or more is formed on the longitudinal center line CL of the absorbent article at a position on the front side of the corresponding portion H. The arc-shaped emboss 24 is formed along In the case of the example shown in FIG. 7, the thickness of the absorber 4 may be uniform, but in the example shown in the drawing, the absorber on the rear side is relatively bulky with the dam groove 13 as a boundary.
[0027]
[ Reference Example 2]
Next, the sanitary napkin 1B according to the reference second embodiment shown in FIG. 9 is a sanitary napkin having a structure that does not have the middle-high portion 12, and the other structures are the same as those of the first embodiment. Reference numerals are assigned and description is omitted.
[0028]
In the case of such a sanitary napkin 1B, it does not have the dam groove 13, but the convex portion 11 that is relatively bulkier than the upper surface of the absorber 4 is formed in the front portion of the absorber 4. The bulky convex portion 11 comes into close contact with the front side of the body at the time of wearing, and the front leakage can be effectively prevented by serving as a leak-proof wall. Also in this case, the bulky convex portion 11 is formed under the condition that the end side is a front side position relative to the body fluid discharge port corresponding portion, and naturally, the absorbent article is formed from the end end of the bulky convex portion 11. The section ML of at least 7 mm or more is relatively lower than the bulky convex portion 11 toward the center side of 1B and on the longitudinal center line CL of the absorbent article 1B.
[0029]
As shown in FIG. 10, the bulky convex portion 11 is formed by stacking a bulky forming material 21 having or not having hydrophilicity on the upper surface side of the absorber 4 as in the first embodiment. However, as shown in FIG. 11 (A), the front end portion of the absorbent body 4 may be partially thickened to form the bulky convex portion 11, or FIG. ), The bulky convex portion 11 may be formed by laminating one or more separate absorbers 25. Further, as shown in FIG. 11C, a cushion material 26 such as a sponge made of a resin foam and having high flexibility may be laminated.
[0030]
[ Reference Example 3]
Furthermore, the sanitary napkin 1C according to the third reference embodiment shown in FIG. 12 (only the absorbent body is displayed) does not have a clear end on the bulky convex portion 11 as in the first and second embodiments. In addition, the pre-leak prevention bulky portion 27 that is relatively bulky by Δt relative to the height of the substantially central point P of the bodily fluid discharge port corresponding portion H at a position on the front side of the body fluid discharge port corresponding portion H of the absorbent body 4. Is formed. Even if the front bulky portion is not clearly formed in a step shape as in the first and second embodiments, the front leak preventing bulky portion 27 is in close contact with the front side of the body at the time of wearing, and serves as a leak-proof wall. By fulfilling it, it becomes possible to prevent the pre-leakage effectively.
[0031]
【The invention's effect】
According to the present invention as detailed above, a bulky protrusion formed on the front portion of the absorbent body, it becomes possible to reliably prevent Therefore before leakage stopper groove dam formed by the domed section.
[Brief description of the drawings]
FIG. 1 is a development view of a sanitary napkin 1A according to a first embodiment of the present invention.
FIG. 2 is a view taken along the line II-II in FIG.
FIG. 3 is a view taken along the line III-III in FIG. 1;
4 is a view taken in the direction of arrows IV-IV in FIG. 1;
5 is a schematic cross-sectional view showing another reference formation mode of the bulky convex portion 11. FIG.
6A and 6B show other reference formation modes of the dam groove 13, wherein FIG. 6A is a plan view of the absorber, and FIG. 6B is a view taken along the line BB of FIG.
7A and 7B show another reference formation mode of the damming groove 13, wherein FIG. 7A is a plan view of the absorber, and FIG. 7B is a view taken along line BB in FIG.
FIG. 8 is a perspective view showing a mounted state of the napkin.
FIG. 9 is a development view of a sanitary napkin 1B according to a reference second embodiment of the present invention.
10 is a view taken along the line XX in FIG. 9;
11 is a schematic cross-sectional view showing another reference formation mode of the bulky convex portion 11. FIG.
Figure 12 shows a sanitary napkin 1C (Display only absorber) according to the reference third embodiment of the present invention, (A) is a plan view, (B) is a view taken along line B-B view of (A) is there.
FIG. 13 is a longitudinal sectional view of a conventional sanitary napkin.
[Explanation of symbols]
1A, 1B ... sanitary napkin, 2 ... liquid-impervious back sheet, 3 ... liquid-permeable top sheet, 4 ... absorbent, 5 ... crepe paper, 6 ... fiber assembly, 7 ... solid gather, 8 ... first Wing, 9 ... 2nd wing, 10 ... Nonwoven fabric for gather formation, 11 ... Bulky convex part, 12 ... Middle high part, 13 ... Damping groove, 14-16 ... Linear embossing, 18 ... Tape-like elastic elastic member, 19 ... Thread-like elastic elastic member, 20 ... folding line, 21, 25, 26 ... bulky forming material, 23 ... gourd-shaped embossing, 24 ... arc-shaped embossing, 27 ... bulky part for preventing pre-leakage

Claims (4)

In the absorbent article in which the absorbent body is interposed between the liquid-permeable top sheet and the liquid-impermeable back sheet, and the middle and high parts are formed along the longitudinal direction in the center part in the width direction ,
A bulky convex part is formed on the front part of the absorbent body under the condition that the front end side position is the end of the body fluid discharge port corresponding part, and the longitudinal direction of the absorbent article is between the front end edge of the middle and high part. An absorbent article having a high pre-leakage prevention effect, characterized in that a damming groove having a width of at least 7 mm or more is formed on the direction center line. The absorbent article having a high pre-leak prevention effect according to claim 1, wherein the bulky convex portion has a dimension in the absorbent body width direction of at least 20 mm or more. The bulky protrusion boundary, partial or high absorbent article of prior leakage prevention effect according to approximately claim 1, 2 or that the entire width is formed with linear embossing. High absorbent article of prior leakage prevention effect according to the bulky protrusion portion, to any one of claims 1 to 3 which had been standing in a ship target shape.

Images