JPH0444761A - Absorptive material - Google Patents

Abstract

PURPOSE:To suppress the displacement and twisting of an absorptive material, stably situate it in the crotch and hip parts, and effectively prevent leakage of body fluids such as menstrual blood and urine in these parts by providing a leakage preventing material with a pair of ear pieces extending from the longitudinal double-side end parts to the center, and providing a surface material with liquid impermeable parts ranging from the upper surface double-side parts to the parts corresponding to the respective extending base parts of the ear pieces. CONSTITUTION:A surface sheet 2 encloses an absorptive body 4 front surface, and has a liquid permeable part 2A in the center of a surface to contact with the skin and liquid impermeable parts 2B on the longitudinal double outsides of the liquid permeable part 2A. In this case, in the liquid permeable part 2A, a body fluid permeates from its opening part, the return of the body fluid can be prevented in the other part, and, in its turn, shielding property and dry feeling after absorption in the liquid permeable part 2A can be ensured. Thus, the fixed state is stably held without twisting the ear pieces at the time of wearing, and the leakage of body fluids such as menstrual blood and urine can effectively be prevented.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to sanitary napkins, pads for incontinence, etc. that are worn by the user in the narrow crotch area along with underwear such as shorts (hereinafter referred to as "shorts"). The present invention relates to an absorbent article, and more particularly, to an absorbent article having a high degree of leak-proofing property.

[Prior art and problems to be solved by the invention] Conventional absorbent articles such as sanitary napkins and incontinent panties have the following problems:
Basically, it is composed of a liquid-permeable surface material, a liquid-retaining absorbent body, and a liquid-impermeable leakage prevention material. and,
In recent years, efforts have been made to improve absorption performance by introducing new materials into each component, such as absorbent polymers and hydrophobic surface materials.

However, even with absorbent articles that have introduced new materials and each component exhibits excellent performance, there is still some leakage from the crotch and buttocks during actual use, and overall absorbency is not necessarily high. It was difficult to say that the original performance of the product was fully demonstrated.

The main causes of such leakage are: ■ irregular forces applied to the worn absorbent article due to the user's activities, etc., causing the absorbent article to shift from its predetermined wearing position, and ■ failure of the absorbent article. Regular deformation and twisting can create gaps between the body and the absorbent article, and ■ twisting can cause both sides of the absorbent article to deform and stick tightly to the center, causing absorption at both side edges. This is caused by the movement of body fluids and making you feel hot. Furthermore, the leakage caused by items 1 to 2 is also greatly affected by the shorts worn by the user. For example, if you wear loose shorts that do not fit tightly to your body, this will have a significant effect, and the above-mentioned leakage is likely to occur even with a relatively low absorption capacity. In addition, when wearing shorts that closely fit the body, the user often has to endure discomfort such as a feeling of pressure and stuffiness.

Therefore, in order to solve these problems, absorbent articles have conventionally been developed in which a pair of flexible flaps (lugs g) are extended from the central part of both sides of the absorbent article in the width direction. In the case of these absorbent articles, which have been proposed in many ways (Japanese Unexamined Patent Publication No. 60-75058, Japanese Unexamined Patent Publication No. 111002, etc.), each ear piece is wrapped around shorts when the absorbent article is used. By fixing it to shorts, it is stabilized and has improved leak-proofing properties.

However, although these absorbent articles can effectively prevent leakage caused by ■ and ■ mentioned above to some extent if they are correctly installed in the correct position, they still do not effectively prevent leakage caused by ■ mentioned above. I haven't reached the point yet. For example, when wearing underwear such as shorts that do not fit closely to the body or whose crotch width is larger than the width of the absorbent material, even if the absorbent article is fixed to the crotch part with ear pieces, There has been a problem in that when the absorbent article twists, the ear pieces roll up and cover the surface of the absorbent article, making it impossible to effectively prevent leakage.

Therefore, an object of the present invention is to stably maintain the fixed state of the ear pieces without rolling them up when worn, suppress the positional shift and twisting of the absorbent article, and stably position the absorbent article in the groin area and buttocks. The object of the present invention is to provide an absorbent article that can effectively prevent leakage of body fluids such as menstrual blood and urine from these areas.

One Step to Solve Problem 11] As a result of various studies on absorbent articles with ear pieces that can prevent leakage in the crotch and buttocks, the present inventor found that the attachment of the ear pieces depends on the aspect and the surface material ε. It has been found that by applying this specific T-husband, the above objectives can be achieved and 2 obtained.

The present invention has been made based on the knowledge described above, and includes a liquid-permeable surface material, a liquid-impermeable leakage prevention material, and a liquid-retaining absorbent body interposed between these two members, In an absorbent article formed in a vertically elongated stroma, the leak-proof material is provided with a pair of ears extending centrally from both ends of the leak-proof material, and the surface material L is provided with a liquid-proof material. The present invention provides an absorbent article characterized in that a permeable portion is provided from both sides of the upper surface of the surface material to at least a portion corresponding to the extending base of each of the lugs J1.

[Function] According to the present invention, if the absorbent article is fixed to the shorts by wrapping the pair of ear pieces around the crotch part of the shorts, then the liquid-permeable part will close to the body fluid discharge part. Even if the user does exercise etc. after wearing it, each ear L-
The absorbent article can be stably held in its original position without being rolled up.

[Example] Hereinafter, the present invention will be explained based on the example shown in Figures 1 to 5. 11 is a plan view of the back surface of the absorbent article of the present invention that contacts the shorts of the embodiment; FIG. Figures 3 and 4 correspond to Figure 2 showing other embodiments of the absorbent article of the present invention, and Figure 5 is a perspective view showing the absorbent article shown in Figure 1 worn on shorts. It is.

As shown in Question 1 and Figure 2, the absorbent article 1 of the 4-touch example has liquid permeability in Table 1, which allows bodily fluids such as menstrual blood to pass through when it comes into contact with the skin.
hj material (top sheet) 2, a leak-proof material (leak-proof sheet) 3 that comes into contact with underwear such as underwear and prevents leakage of body fluids, and a liquid-retaining absorbent material 4 interposed between these two sheets 2 and 3. It is composed of

Thus, the top sheet 2 in this embodiment surrounds the entire surface of the absorbent body 4, has a liquid permeable part 2A in the center of the surface that contacts the skin, and has a liquid permeable part 2A on both longitudinal sides of the liquid permeable part 2A. It has a liquid-impermeable part 2B on each outer side. As the surface material 2, known materials such as a nonwoven fabric or a hydrophobic film having openings, a net or a film can be used, and for example, the material described in Japanese Patent Publication No. 1-119251 is preferable. Although not shown, the liquid permeable portion 2A has an uneven structure having a top portion, a bottom portion, and a wall portion connecting these two portions, and it is preferable that an opening portion is provided only in at least a portion of the wall portion. In the liquid-permeable part 2A, body fluid can pass through the opening and prevent the body fluid from returning to other parts, which in turn improves the shielding properties and dryness after absorption in the liquid-permeable part 2A. It is possible to ensure confusion. The above-mentioned openings are provided taking into consideration the balance between body fluid permeability, body fluid return prevention property, and shielding property after absorption, and usually have a size of 0.1 to 2 m.
The density is preferably set to 10 to 100 pieces/cd.

The width W+ of the liquid permeable part 2A can be freely changed depending on the width of the absorbent article 1, but it is the same as the width of the crotch part of the shorts worn with the absorbent article 1 (generally 60 to 75 mm). Or the width is at most smaller than this, 35 to 7
5 sI++ is preferable, and 60 to 70sI++ is more preferable.

If this width w1 is less than 35 square inches, the liquid impermeable parts 2B, 2B on both sides of the liquid permeable part 2A will be located at the body fluid discharge site due to the user's wearing method or wearing error.
There is a risk of leakage, and if the width w1 exceeds 75 mm, it becomes significantly wider than the crotch area and deforms in various ways in the narrow crotch area when worn, causing the both ends of the absorbent article 1 to twist. As a result, both side ends are in close contact with the center part, which makes it easy for body fluids absorbed into both side ends to move, resulting in poor absorbency and an uncomfortable feeling when worn, which is undesirable.

In addition, the liquid impermeable portion 2B has a pair of ears 3A, which will be described later, attached to the surface material 2 from both side portions 2C12C on the upper surface thereof.
, portion 2 corresponding to the extending base portions 3B, 3B of 3A, respectively.
The width W is preferably 2 to 201 m1, more preferably 3 to IO-, and the width W is 20 m to 20 m.
If it is less than Bm, irregular stress will be applied to the attached absorbent article l due to the user's movements, etc., and bodily fluids may seep out from the openings at both ends of the liquid permeable part 2A, causing leakage. If the width W2 exceeds 20 m+, the liquid permeable portion 2A becomes narrow, which is not preferable.

In addition to the above, methods for controlling the liquid permeability and liquid return prevention properties of the top sheet 2 include coating of a surfactant, physical treatment such as plasma irradiation, chemical treatment such as mineral acid treatment, etc. There is a method of making the surface of the film hydrophilic, and conversely, there is also a method of making the surface of the film water repellent, such as by applying silicone-based or fluorine-based chemicals. Furthermore, the texture of the topsheet 2 can be improved, if necessary, by calendering the film or embossing it with a fine pattern. Furthermore, from the viewpoint of absorbency, especially absorption rate, sheets in which a film and a hydrophilized fiber aggregate are integrated, such as laminated nonwoven fabric, laminated paper, etc., are preferably used.

Further, the leak-proof sheet 3 is polymerized with the surface note 2 on the entire back surface of the absorbent body 4 that does not come into contact with the skin. The leak-proof sort 3 has tabs 3A, 3A, and each tab 3A, 3A is biased forward in the longitudinal direction of the absorbent article 1 and extends from both ends of the longitudinal direction toward the center. There is. Each of the ear pieces 3A, 3A exists in an area narrower than the width W of the absorbent body 40, and is wound around the crotch part of the shorts to fix the absorbent article to the crotch part.

In this way, each of the ear pieces 3A, 3A is positioned so as to be biased forward in the longitudinal direction of the absorbent article 1, so that the absorbent article 1 is fixed in a state that generally corresponds to the region from which body fluid is discharged, and each ear piece 3A, the length of the absorbent body 4 behind 3A is larger than that in the front, and the area of the absorbent body 4 that covers the buttocks when worn increases relatively compared to the pubic region, suppressing leakage from the buttocks. can do. At this time, the position of each ear piece 3A, 3 is preferably offset 20 to 40 m forward from the longitudinal center of the absorbent article 1. That is, each ear piece 3A, 3
As is clear from FIGS. 1 and 2, in A, the flap portion, which is wider at the front of the leak-proof sheet 3 than the other portions, is moved outward in the width direction from each side edge of the absorbent body 4. It is folded back inward so that it does not extend outward, and extends toward the center as described above.

I'm here. Then, each of the ear pieces 3A, 3A is joined and fixed in a linear manner in the longitudinal direction slightly inside the respective folded parts to form fixing parts 3B, 3B, and the respective extending ends are fixed.
The fixed parts 3B, 3 are located approximately in the center of the absorbent body 4.
B forms an extending base of each of the ear pieces 3A, 3A. And, each ear piece 3A, 3A is held by each fixing part 3B, 3B in a form opposite to the back surface of the decimal mirror body 4, and despite the size of the shorts and the movement of the user, the absorbent article 1 This effectively prevents the ear pieces 3A, 3A from coming into contact with the surface of the absorbent body 4 due to displacement or twisting.

Further, as shown in FIG. 2, the fixing portions (extending base portions) 3B, 3B of the respective ear pieces 3A, 3A are connected to the liquid impermeable portions 2B, 2B which sandwich the liquid permeable portion 2A of the topsheet 2. The absorbent article 1 is located on the outer side of the absorbent article 1 than the inner edge of the absorbent article 1, so that the absorbent article 1 does not sway due to the user's movements, and body fluids absorbed in the absorbent body 4 can flow from both side edges of the absorbent article 1. It is designed to prevent side leakage. It is preferable that the width W4 between the fixing parts 3B and 3B is approximately the same as or slightly narrower than the width of the crotch part of ordinary shorts. Approximately the same width W of the sexual part 2A - or 7
It is preferable that the area is slightly wider. That is, it is preferable to satisfy the following relationship.

W1≦wa<W5 In addition, when W4≧W, there is a portion where the ear piece 3A contacts the surface of the absorbent body 4. For example, when the absorbent article 1 is worn on loose shorts, the absorbent This is undesirable since the ear piece 3A may come into contact with the surface of the absorbent body 4 due to twisting of the article 1 or the like. In addition, when W>w, at least one side/edge of the liquid permeable part 2A of the surface material 2 protrudes beyond the crotch part of the shorts, and the liquid impermeable part 2 +3
This is undesirable as it reduces the leakage prevention effect.

The size of the ear piece 3A is not generally defined, but is appropriately set depending on the stability of fixing to the shorts, the ease of the fixing operation, and the size of the absorbent article 1. For example, in the case of a night napkin in which the length and width of the absorbent body 4 are about 250+ nm and 70 nm, respectively, the length and width to the ear piece 3 are generally 30-70 m and 2525-50 nm, respectively. preferable. Furthermore, any material can be used as the ear piece 3A as long as it has the flexibility to bend easily when fixed to the shorts, but in order to improve shape retention and tactile sensation, for example, It is preferable to use a film in which a hydrophilic fiber aggregate is integrated with a film such as , laminated nonwoven fabric, or laminated paper. Incidentally, as a method for fixing the ear piece 3B to the leakage preventive material 3-, conventionally known methods can be used, but considering the productivity etc., using a Hono]-Nor 1-type adhesive, It is preferable to bond in a bead shape or in a parallel shape, and considering the texture of both sides and ends, a bead shape is most preferable from the surface.

In addition, the width W3 of the number body 4 that is raised to - is +l when normally worn.
Width of crotch part of Runo η~tsu (60~75G!111)
It is preferable that the width is close to or slightly wider than that, and usually, the width w3 is preferably 60 to 80 m. If this width w3 is too wide, irregular forces will be applied to both ends of the absorbent article 1 in the longitudinal direction when it is worn due to the user's movements, causing the both ends to twist to the center of the surface of the absorbent article 1. If the width W is narrow, it is undesirable because body fluids may leak out when it comes into contact with the body cover, and it gives a feeling of a foreign body when worn.On the other hand, if the width W is narrow, the absorbent capacity of the body cover becomes small, which is not preferable.

Therefore, when using the above-mentioned absorbent article 1, as shown in FIG. , after fixing the shorts to 1,000 parts, when the shorts are worn, the absorbent article 1 becomes curved and convex with respect to the body, and the liquid permeable part 2A
are brought into close contact locally, and the liquid-impermeable parts 2B are stabilized in a state where they are located on both side edges of the crotch part. Even if the user moves in such a state, the force that brings the shorts into close contact with the body will always act on the fixing parts 3B, 3B of each ear piece 3A, 3A through both side edges of the crotch part of the shorts, and the ear piece 3A ,3
It is possible to maintain the absorbent article 1 in a substantially initial state without turning up A, stabilize the leak-proof properties of the liquid-impermeable parts 2B, 2B, and effectively exhibit the original performance of the absorbent article 1. can.

Further, FIG. 3 is a leap line showing the main part of another embodiment of the absorbent article of the present invention, and as shown in the figure, the absorbent article 1 of this embodiment has a The absorbent article 1 shown in FIGS. 1 and 2 except that the top sheet 2 is omitted.
It is configured in the same way. That is, the central part of the back surface of the absorbent body 4 in the present absorbent article 1 is entirely covered with the leak-proof sheet 3 to prevent leakage of bodily fluids absorbed by the absorbent body 4. Therefore, according to this embodiment, the same effects as those of the above embodiment can be expected, and also,
The amount of top sheet 2 used can be saved.

Moreover, FIG. 4 is a diagram showing the main parts of still another embodiment of the absorbent article of the present invention, in which the leak-proof sheet 3 is divided into two in the longitudinal direction, and each ear Piece 3A, 3A
It is made of a sheet material with elastic recovery that can always maintain a shape that wraps around underwear such as shorts. Other than these points, the structure is similar to the embodiment shown in FIGS. 1 and 2. If the above sheet material is used,
Fixing means for the folded portion of the ear piece 3A can be omitted. As the sheet material, for example, when using a fiber aggregate obtained by heat-sealing polyethylene terephthalate (PET) & 1i fibers and binder fibers, or a foam such as foamed polyethylene or foamed urethane, the sheet material is It may be used for the entire area or only for the folded portion.

In each of the above embodiments, the pair of ear pieces 3A, 3A were explained only in the case where the pair of ear pieces 3A, 3A were biased forward in the longitudinal direction of the leakage prevention notebook 3, but the absorbent article of the present invention The position, etc. is not limited to the above embodiments in any way, and in short,
The leakage preventive material is provided with a pair of ears extending from each of its longitudinally opposite ends toward the center, and the surface material is provided with a pair of ears,
Any structure in which the liquid-impermeable portion is provided from both sides of the upper surface of the surface material to at least a portion corresponding to the extending base of each of the ear pieces is included in the present invention.

〔Effect of the invention〕

When worn, the absorbent article of the present invention stably maintains a fixed state without the ear pieces being rolled up, suppresses positional shift and twisting of the absorbent article, and stably positions the absorbent article in the groin and buttocks. This makes it possible to effectively prevent leakage of body fluids such as menstrual blood and urine at these sites.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a plan view showing the back side of an embodiment of the absorbent article of the present invention that contacts shorts, and FIG. 2 is a cross-sectional view of the absorbent article shown in FIG. 3 and 4 are views corresponding to FIG. 2 showing other embodiments of the absorbent article of the present invention, and FIG. 5 shows a state in which the absorbent article shown in FIG. 1 is attached to shorts. FIG. I; Absorbent article 2, top sheet (surface material) 2C; Side portion 2D; Part 3 corresponding to the extended base; Leak-proof sheet (leak-proof material) 3A; Ledge piece 3B; Fixing part (extended base) 4 ;Absorber Figure 1 Figure 3 Figure 4

Claims (4)

[Claims] (1) In an absorbent article formed substantially vertically and having a liquid-permeable surface material, a liquid-impermeable leak-proof material, and a liquid-retentive absorbent body interposed between these two members, The leakage preventive material is provided with a pair of ears extending from each of its longitudinally opposite ends toward the center, and the surface material is provided with a liquid-impermeable portion extending from both sides of the upper surface of the surface material at least to the ears. An absorbent article characterized in that the absorbent article is provided over a region corresponding to the extending base of each piece. (2) The absorbent article according to claim (1), wherein the pair of ear pieces are biased forward in the longitudinal direction of the leak preventer. (3) The liquid impermeable portion has a width of 2 to 20 mm (
The absorbent article described in 1) or (2). (4) The liquid-impermeable portion has a width of 3-10 mm (
The absorbent article described in 1) or (2).