JP7091101B2 - Absorbent article - Google Patents

Description

The present invention is an absorbent article mainly used for menstrual napkins, vaginal discharge sheets, incontinence pads, toiletries, etc., and more specifically, it is provided with rear flaps that can be extended outward on both sides of the rear. It relates to an absorbent article in which the width of the rear side including the rear flap is made adjustable.

Conventionally, the absorbent article is made of cotton-like pulp or the like between a liquid-impermeable back sheet such as a polyethylene sheet or a polyethylene sheet laminated non-woven fabric and a liquid-permeable front sheet such as a non-woven fabric or a liquid-permeable plastic sheet. It is known that gathered nonwoven fabrics that mediate an absorber and form a pair of left and right three-dimensional gathers that project toward the skin side on both sides of the skin side are arranged along the longitudinal direction.

For nighttime menstrual napkins that are suitable for use at bedtime, etc., in order to more securely fix to underwear and effectively prevent leakage from the buttocks side (post-leakage), both sides of the napkin in the longitudinal direction In addition to providing a wing-shaped flap that is used by folding back the crotch part of the underwear, there is also a rear flap that extends outward to cover the wearer's buttocks on both sides of the rear part.

In an absorbent article provided with such a rear flap, an absorbent body is also arranged on the rear flap so that the body fluid can be absorbed (see, for example, Patent Documents 1 and 2 below).

Japanese Unexamined Patent Publication No. 2017-11920 Japanese Unexamined Patent Publication No. 2016-120211

In the absorbent articles described in Patent Documents 1 and 2, since the flap absorber is arranged on the rear flap, the body fluid can be absorbed by the flap absorber as well, and the leakage of the body fluid from the buttocks can be prevented. become.

By the way, in order to eliminate the anxiety of leakage when the menstrual napkin cannot be replaced for a long time, the inventors have found that not a few users wear the menstrual napkin for the night even in the daytime other than bedtime. It became clear by the investigation of.

When using a menstrual napkin for the night at bedtime, the rear flaps extend to both sides in anticipation of strengthening the absorption function in a wider range in order to prevent leakage from the buttocks in the recumbent position etc. People tend to prefer a type that covers a large area of the buttocks with a rear flap, but if this night's menstrual napkin is used during the daytime other than bedtime, the large area of the buttocks will be covered by the rear flap. However, there is a tendency that a type without a rear flap is preferred because it causes a problem that it becomes stuffy and easily irritated by sweat or the like.

In this way, the preferred type differs depending on the situation of use and the mood of the user, so depending on the presence or absence of the rear flap, there are two types of menstrual napkins: a menstrual napkin for bedtime and a menstrual napkin for when it cannot be replaced for a long time in the daytime. It took time and cost to buy all the menstrual pads.

Therefore, the main problem of the present invention is to make the width of the rear side adjustable in an absorbent article having a rear flap that can be extended outward on both sides of the rear, regardless of the situation in which it is used. It is an object of the present invention to provide an absorbent article which can be used in combination with one absorbent article and which prevents body fluid from leaking from both sides of the rear part.

In order to solve the above problems, the present invention according to claim 1 is an absorbent article provided with a rear flap that can be extended outward on both sides of the rear portion.
An absorber is arranged on the rear flap, and the rear flap is provided along the longitudinal direction of the absorbent article and at a predetermined interval in the width direction of the absorbent article by two or more folding lines. An absorbent article is provided characterized in that it is folded to the skin side and its condition is maintained by temporary fixing means.

In the invention according to claim 1, the rear flap is maintained to be folded by the temporary fixing means, and the rear flap is unfolded by releasing the temporary fixing means. The width is adjustable. In the used state where the rear flap is folded, the rear flap does not cover a wide range of the buttocks and is less likely to cause a rash due to sweat or the like, so that it is suitable for use in situations where it cannot be replaced for a long time in the daytime. In the used state where the rear flap is expanded, the rear flap covers a wide range of the buttocks to prevent leakage from the buttocks, and is therefore suitable for use at bedtime or the like. As described above, the width of the rear side portion of the absorbent article can be adjusted between the state in which the rear flap is folded by the non-release of the temporary fixing means and the state in which the rear flap is unfolded by the release of the temporary fixing means. Regardless of the situation, one absorbent article can be used in various situations.

In addition, when the rear flap is folded toward the skin, the folded rear flap acts as a barrier that bulges toward the skin on both sides of the rear, so that the function of preventing leakage from both sides of the rear can be strengthened. become. In this case, since two or more fold lines are provided at predetermined intervals in the width direction, the function as a barrier by the folded rear flap can be surely exhibited in the used state where the rear flap is folded. become.

As the present invention according to claim 2, the temporary fixing means is provided with the absorbent article according to claim 1, which comprises any one of a squeezed portion and an adhesive portion or a combination thereof.

In the invention according to claim 2, as the temporary fixing means, if it can be easily released by hand, it may be configured by a squeezing portion or an adhesive portion, or may be configured by a combination thereof. ..

According to the third aspect of the present invention, the absorbent article according to any one of claims 1 and 2, wherein the basis weight of the absorber arranged on the rear flap is changed along the width direction of the absorbent article. Provided.

In the invention according to claim 3, the basis weight of the absorber disposed on the rear flap is changed along the width direction of the absorbent article. For example, when the basis weight of the absorbent article is gradually lowered from the inside to the outside in the width direction, the absorption capacity is higher in the inner side in the width direction when the rear flap is expanded, so that the weight is applied to the rear flap. Diffusion of body fluid is suppressed, and leakage from the rear can be reliably prevented.

On the contrary, when the basis weight of the absorber disposed on the rear flap is gradually increased from the inside to the outside in the width direction of the absorbent article, the rear flap is laminated in the folded state. Of the folded portions of the rear flap, the folded portion closer to the skin surface has a higher absorption capacity, so that the function of the folded portion as a barrier can be more effectively exhibited.

According to the fourth aspect of the present invention, the absorber disposed on the rear flap is provided with a low basis weight portion in which the basis weight of the absorber is lowered along the fold line at the position of the fold line. The absorbent article according to any one of claims 1 to 3 is provided.

According to the fourth aspect of the present invention, the absorber disposed on the rear flap prevents the rear flap from being difficult to fold, and at the same time, it feels uncomfortable when worn due to the folding habit when unfolded and adheres to the skin surface. This is an example of a form of means for preventing the decrease in the weight of the absorber, and a low basis weight portion having a low basis weight of the absorber is provided along the fold line at the position of the fold line of the absorber arranged on the rear flap. ing. By providing the low basis weight portion, the rear flap can be easily bent at the folding line, and the folding habit is less likely to occur when unfolded.

The absorption according to claim 5, wherein the absorber disposed on the rear flap is divided in the width direction of the absorbent article at the position of the fold line. Sexual goods are provided.

The invention according to claim 5 is another embodiment of the means for preventing the rear flap from being difficult to fold and preventing the folding habit when unfolded, and is an absorber disposed on the rear flap. Is divided in the width direction of the absorbent article at the position of the fold line. By dividing the absorber, folding becomes easy and folding habits are less likely to occur.

As the present invention according to claim 6, the absorbent article according to claim 5 is provided, wherein the divided absorbers are not directly bonded to each other, and a space portion is formed between adjacent absorbers. Will be done.

In the invention according to claim 6, the divided absorbers are not directly bonded to each other, and a space portion is formed between the adjacent absorbers, so that the divided absorbers can be separated from each other. It facilitates the flow of body fluids, reduces the diffusion of body fluids in the width direction, and prevents leakage from both sides of the rear part.

According to the seventh aspect of the present invention, the absorber extending from the main body absorber disposed in the region including the body fluid draining portion of the wearer toward the absorber disposed on the rear flap is recessed. The absorbent article according to any one of claims 1 to 6 in which an embossed groove is formed is provided.

In the invention according to claim 7, the embossing is made so that more body fluid can be absorbed by effectively utilizing the absorption capacity of the absorber disposed on the rear flap in the used state where the rear flap is expanded. By forming the groove, a part of the body fluid absorbed in the main body portion is guided to the absorber arranged in the rear flap.

According to any one of claims 1 to 7, according to claim 8, side nonwoven fabrics are arranged on both sides on the skin side, and the rear flap is folded within the width in which the side nonwoven fabrics are arranged. The absorbent article described is provided.

In the invention according to claim 8, since the rear flap is folded within the width in which the side nonwoven fabric is arranged, the function as a barrier at both rear portions of the folded rear flap is more effective. You will be able to demonstrate it.

As described in detail above, according to the present invention, in an absorbent article provided with a rear flap that can be extended outward on both sides of the rear portion, the width of the rear side portion can be adjusted to be used regardless of the situation. Instead, it can be used as a single absorbent article, and the leakage of body fluid from both sides of the rear part can be prevented.

It is a partially broken development view of the menstrual pad 1 which concerns on this invention. FIG. 1 is a view taken along the line II-II of FIG. FIG. 3 is a view taken along the line III-III of FIG. It is a top view of the menstrual napkin 1 in the state where the rear flap _WB is folded. It is a VV line arrow view of FIG. (A) and (B) are cross-sectional views of the menstrual napkin 1 according to the modified example (line III-III arrow view of FIG. 1). It is a top view (the 1) of the menstrual pad 1 which concerns on a modification. FIG. 2 is a plan view (No. 2) of the menstrual pad 1 according to the modified example. It is the IX-IX line arrow view of FIG. 3 is a plan view (No. 3) of the menstrual pad 1 according to the modified example. FIG. 4 is a plan view (No. 4) of the menstrual pad 1 according to the modified example. It is a top view (No. 5) of the menstrual pad 1 which concerns on a modification. FIG. 6 is a plan view (No. 6) of the menstrual pad 1 according to the modified example. FIG. 3 is a cross-sectional view of the menstrual pad 1 according to another embodiment (viewed along the line III-III in FIG. 1).

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Basic structure of menstrual napkin 1]
As shown in FIG. 1, the sanitary napkin 1 according to the present invention has at least the inseam A covering the wearer's body fluid draining portion H and the anterior side covering the wearer's lower abdomen arranged in front of the inseam A when worn. It is composed of a portion B and a posterior portion C that covers the buttocks of the wearer arranged on the rear side of the inseam A, and the longitudinal dimension of the posterior portion C is formed longer than the longitudinal dimension of the front side portion B. It was done. The longitudinal dimension of the rear side portion C is preferably about 2 to 10 times, preferably about 3 to 5 times, the longitudinal dimension of the front side portion B.

As shown in FIGS. 1 to 3, this menstrual napkin 1 promptly dissipates an impermeable back sheet 2 made of a polyethylene sheet or the like, menstrual blood, vaginal discharge, etc. (hereinafter collectively referred to as body fluid). A liquid-permeable surface sheet 3 that allows permeation into the skin, an absorber 4 made of cotton-like pulp or synthetic pulp interposed between the two sheets 2 and 3, and longitudinal directions on both sides of the skin contact surface side, respectively. The side non-woven fabrics 7 and 7 provided over almost the entire length are provided, and around the absorber 4, the impermeable back sheet 2 and the liquid-permeable surface sheet 3 are provided at the upper and lower end edges thereof. The impermeable back sheet 2 whose outer edge is joined by an adhesive such as hot melt or a joining means such as heat seal or ultrasonic seal, and whose both side edges extend laterally from the absorber 4. And the side non-woven fabric 7 are joined by an adhesive such as hot melt or a joining means such as a heat seal or an ultrasonic seal, and a pair of left and right wing-shaped flaps W, W are located at the position on the side of the absorber substantially corresponding to the body fluid discharge portion H. And the rear flaps _WB and _WB that can be extended outward (sideways) are formed on both sides of the rear side (buttock side). In the illustrated example, in order to maintain the shape of the absorber 4 and improve the diffusivity, the absorber 4 is surrounded by an encapsulating sheet 5 made of crepe paper, a non-woven fabric, or the like. It does not have to be provided. Further, as will be described in detail later, a second sheet 6 made of a hydrophilic non-woven fabric or the like may be arranged adjacent to the non-skin side of the liquid-permeable surface sheet 3 (see FIG. 14).

Hereinafter, the structure of the menstrual napkin 1 will be described in more detail.
As the impermeable back sheet 2, a sheet material having at least water impermeability such as polyethylene is used, but it is desirable to use a sheet material having moisture permeability from the viewpoint of preventing stuffiness. The water-impervious / moisture-permeable sheet material has microporous properties obtained by melting and kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching the sheet in a uniaxial or biaxial direction. Sheets are preferably used. On the non-skin side surface (outer surface) of the impermeable back sheet 2, one or a plurality of adhesive layers (not shown) are formed along the longitudinal direction of the napkin, and the menstrual napkin 1 is attached when attached to the body. It is designed to be fixed to underwear. As the impermeable back sheet 2, a polylami non-woven fabric in which a plastic film and a non-woven fabric are laminated may be used.

Next, as the liquid-permeable surface sheet 3, a perforated or non-perforated non-woven fabric, a porous plastic sheet, or the like is preferably used. The material fibers constituting the non-woven fabric can be olefin-based fibers such as polyethylene or polypropylene, synthetic fibers such as polyester-based and polyamide-based, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A non-woven fabric obtained by an appropriate processing method such as a method, a spunbond method, a thermal bond method, a melt blown method, or a needle punching method can be used. Among these processing methods, the spunlace method is excellent in that it is rich in flexibility and drapeability, and the thermal bond method is excellent in that it is bulky and has high compression stability. When a large number of through holes are formed in the liquid-permeable surface sheet 3, the body fluid is quickly absorbed, and the dry touch property is excellent. The fibers of the non-woven fabric may be either long fibers or short fibers, but it is preferable to use short fibers in order to give the texture of the towel cloth. Further, in order to facilitate the embossing treatment, it is preferable to use an olefin fiber such as polyethylene or polypropylene having a relatively low melting point. Further, a core-sheath type fiber having a high melting point fiber as a core and a low melting point fiber as a sheath, a side-by-side type fiber, and a composite fiber of a split type fiber can also be preferably used.

The absorber 4 interposed between the impermeable back sheet 2 and the liquid permeable front sheet 3 is, for example, a pulp in which a highly water-absorbent resin is mixed, or a pulp in which chemical fibers are mixed. , A mixture of highly absorbent resin is used. As shown in the figure, it is desirable that the absorber 4 is surrounded by an encapsulating sheet 5 in order to maintain its shape, quickly diffuse menstrual blood, etc., and prevent reversion of menstrual blood, etc. once absorbed. Examples of the pulp include cellulose fibers such as chemical pulp and molten pulp obtained from wood, and artificial cellulose fibers such as rayon and acetate. It is preferably used in terms of price. Further, as the absorber 4, an air-laid absorber capable of reducing the bulk or a polymer sheet in which a highly water-absorbent resin is arranged between two layers of a non-woven fabric may be used.

Further, synthetic fibers may be mixed with the absorber 4. As the synthetic fiber, for example, polyolefin-based fibers such as polyethylene or polypropylene, polyester-based fibers such as polyethylene terephthalate and polybutylene terephthalate, polyamide-based fibers such as nylon, and copolymers thereof can be used, and these two types can be used. It may be a mixture. Further, composite fibers such as core-sheath type fibers having a high melting point fiber as a core and a low melting point fiber as a sheath, side-by-side type fibers, and split type fibers can also be used. In the case of hydrophobic fibers, it is desirable to use the synthetic fibers surface-treated with a hydrophilic agent so as to have an affinity for body fluids.

Examples of the highly water-absorbent resin include a polyacrylic acid crosslinked product, a self-crosslinked polyacrylic acid salt, a saponified product of an acrylic acid ester-vinyl acetate copolymer crosslinked product, an isobutylene / maleic anhydride copolymer crosslinked product, and the like. Examples thereof include cross-linked polysulfonates and partially cross-linked water-swellable polymers such as polyethylene oxide and polyacrylamide. Of these, acrylic acid or acrylate-based ones, which are excellent in water absorption amount and water absorption rate, are suitable. In the manufacturing process, the highly water-absorbent resin having the water-absorbing performance can adjust the water-absorbing power and the water-absorbing rate by adjusting the cross-linking density and the cross-linking density gradient.

When the encapsulating sheet 5 surrounding the absorber 4 is provided as in this example, as a result, the encapsulating sheet 5 is interposed between the liquid-permeable surface sheet 3 and the absorber 4. When the packaged sheet 5 is made of crepe paper, the body fluid is rapidly diffused by the packaged sheet 5 having excellent absorbability, and the reversion of menstrual blood and the like is prevented.

The absorber 4 is outside the main body absorber 10 arranged over almost the entire length in the longitudinal direction in the width dimension of the longitudinal section including the body fluid draining portion H of the wearer, and the rear both sides of the main body absorber 10. It is composed of a flap absorber 11 extending toward the side and arranged in a region including the rear flap _WB . The main body absorber 10 has a width dimension in a longitudinal section of the absorber 4 including the body fluid draining portion H of the wearer, that is, a longitudinal section in which the pair of left and right wing-shaped flaps W and W are formed. It is a portion having a substantially equal width arranged from the front end to the rear end of the. On the other hand, the flap absorber 11 is a portion of the absorber 4 extending laterally from the main body absorber 10 at both rear portions of the menstrual napkin 1. The shape of the outer edge of the flap absorber 11 is preferably formed to follow the shape of the outer edge of the menstrual napkin 1.

In the present menstrual napkin 1, as shown in FIGS. 1 and 3, the main body absorber 10 and the flap absorber 11 may be composed of a continuous integrated absorber, or the main body absorber 10 and the flap may be formed. It may be composed of a separate absorber obtained by dividing the absorber 11 from the absorber 11. In the case of being composed of a continuous integrated absorber, the boundary between the main body absorber 10 and the flap absorber 11 does not necessarily have to be clear, but the width of the absorber in the body fluid discharge portion H is approximately the width of the sanitary napkin 1. A portion extending in the longitudinal direction can be defined as a main body absorber 10, and a portion extending to both sides of the rear both sides thereof can be defined as a flap absorber 11.

In the illustrated example, the width dimension of the liquid-permeable surface sheet 3 is slightly longer than the width of the main body absorber 10 and covers the main body absorber 10, as shown in the cross-sectional views of FIGS. 2 and 3. A side non-woven fabric 7 different from the liquid-permeable surface sheet 3 is arranged on the outer side thereof. As the side nonwoven fabric 7, one made of natural fiber, synthetic fiber, recycled fiber or the like and formed by an appropriate processing method can be used, but it is preferable to eliminate the feeling of stiffness and prevent stuffiness. Therefore, it is preferable to use a hydrophilic non-woven fabric that suppresses the basis weight and has breathability. Specifically, it is desirable to use a non-woven fabric produced with a basis weight of 13 to 23 g / m ² .

As shown in FIGS. 2 and 3, the side nonwoven fabric 7 adheres a hot melt or the like to the outer portion from the intermediate portion in the width direction over a range from a predetermined inner position to the outer edge of the impermeable back sheet 2. Flap portions in which the absorber 4 does not intervene are formed on both sides of the absorber 4 by the laminated sheet portions of the side nonwoven fabric 7 and the impermeable back sheet 2 which are adhered with an agent. This flap portion forms a pair of left and right wing-shaped flaps W, W at the position on the side of the absorber substantially corresponding to the body fluid discharge portion H, and the rear flap _WB formed at the position on the buttocks side (rear side) from this. It constitutes a part of _WB . Adhesive layers (not shown) are provided on the outer surface sides of the wing-shaped flaps W and W and the rear flaps _WB and _WB , respectively, and the wing-shaped flaps W and W are used as base ends when attached to shorts. At the RL position of the folding line, the shorts are folded back to the outer surface side, wrapped around the crotch portion of the shorts and fastened, and the rear flap _WB is fastened to the inner surface of the shorts.

On the other hand, the inner side portion of the side nonwoven fabric 7 is bonded with a hot melt adhesive or the like in a state of being laminated on the skin side surface of the liquid permeable surface sheet 3. Further, although not shown, the inner side portion of the side nonwoven fabric 7 is substantially double folded, and both ends or appropriate positions in the longitudinal direction are fixed to the middle portion in the height direction inside the double sheet. One or a plurality of filamentous elastic elastic members are arranged in a state where both ends or appropriate positions in the longitudinal direction are fixed, and the double sheet portion is laminated at the front and rear ends of the menstrual napkin 1. By adhering to the absorber 4 side at least in a predetermined section in the longitudinal direction of the napkin including the body fluid draining portion H, a pair of left and right three-dimensional gathers standing on the skin side may be formed.

[Rear flap]
In the present menstrual napkin 1, as shown in FIG. 1, an absorber 4 (flap absorber 11) is arranged on the rear flap _WB , and the left and right pairs of the rear flaps _WB and _WB are physiological respectively. The napkin 1 is folded toward the skin along the folding lines L1 and L2 along the longitudinal direction, and the state is maintained by the temporary fixing means (squeezing portion 12, adhesive portion 13) (see FIGS. 4 and 5). .. When the rear flaps _WB and _WB are folded, as shown in FIGS. 4 and 5, the rear flaps _WB do not extend outward in the width direction at the rear side of the sanitary napkin 1. , It is laminated on the skin side of both sides of the main body absorber 10.

As a result, in the present sanitary napkin 1, the rear flap _WB was folded by the temporary fixing means (states of FIGS. 4 and 5), and the temporary fixing means was released to expand the rear flap _WB . The width of the rear flap _WB can be adjusted depending on the state (states of FIGS. 1 and 3). In the folded state of the rear flap _WB , as shown in FIG. 4, the rear side portion of the sanitary napkin 1 is formed approximately at the width of the rear base end portion of the wing-shaped flap W, and the rear flap _WB is formed. In the unfolded state, the rear side portion of the menstrual napkin 1 is formed with a width extending to both sides in the width direction from the rear side base end portion of the wing-shaped flap W.

In the folded state of the rear flap _WB , as shown in FIG. 4, the absorber does not cover a wide area of the buttocks, and is wing-shaped in the rear as well as the region corresponding to the body fluid discharge portion H. Since it is formed with a width almost the same as the width of the rear base end of the flap W, even if the wearer sweats, it is less likely to cause a rash, and it cannot be replaced for a long time in the daytime. Suitable for use. Further, as shown in FIG. 5, the rear flap _WB folded to the skin side functions as a barrier 14 (three-dimensional gather) that bulges toward the skin side on both sides of the rear part, whereby the skin on both sides of the rear part is formed. Adhesion to the surface is improved, and the leak prevention function from both sides of the rear can be strengthened.

On the other hand, in the state where the rear flap _WB described above is deployed, the rear flap _WB covers a wide range of the buttocks, and the rear flap _WB can surely prevent leakage from the buttocks, so that it can be used at night such as at bedtime. Suitable for use as. At this time, since the absorber 4 is also arranged on the rear flap _WB , the area where the body fluid can be absorbed can be increased, and leakage from the buttocks can be prevented more reliably.

In this way, the width of the rear side of the menstrual napkin 1 can be adjusted by non-release / release of the temporary fixing means, so that one menstrual napkin 1 can be used for various situations regardless of the situation in which it is used. become able to.

As shown in FIGS. 4 and 5, the rear flap _WB is folded within the width in which the side nonwoven fabric 7 is arranged so that the function as a barrier is effectively exerted in the folded state. Is preferable. In particular, as shown in FIG. 5, the folded end portion 15 on the inner side in the width direction of the rear flap _WB folded toward the skin side is substantially equal to or more than the inner edge 7a on the inner side in the width direction of the side nonwoven fabric 7, or is more sanitary. It is preferably located outside the width direction of the napkin 1.

As shown in FIG. 1, it is preferable to provide two or more folding lines L1 and L2 at predetermined intervals in the width direction of the menstrual pad 1. In the illustrated example, two fold lines L1 are provided on the inner side in the width direction and two fold lines L2 are provided on the outer side in the width direction at predetermined intervals. The fold line L1 on the inner side in the width direction extends from the base end portion on the rear side of the wing-shaped flap W to the rear end portion of the menstrual padkin 1 substantially parallel to the longitudinal center line CL of the menstrual padkin 1. .. The fold line L2 on the outer side in the width direction is outside in the width direction from the fold line L1 and extends so as to penetrate the rear flap _WB in the longitudinal direction at the intermediate portion between the fold line L1 and the tip in the width direction of the rear flap _WB . There is.

As shown in FIG. 5, the folded rear flap _WB has a first folded portion 17 that is folded back toward the skin side at the folded line L1 and a folded line L2 that is continuous with the first folded portion 17. Further, it is folded in three by the second folded portion 18 that is folded back toward the skin side. Here, the surface of the second folded-back portion 18 on the side non-woven fabric 7 side constitutes a skin contact surface.

As shown in FIG. 1, the positions of the fold lines L1 and L2 are the fold lines L1 with reference to the distance X1 in the napkin width direction between the fold line L1 and the inner edge 7a of the side non-woven fabric 7 in the width direction. , The distance X2 in the napkin width direction between L2 and the distance X3 in the napkin width direction between the fold line L2 and the tip 16 outside the width direction of the rear flap _WB are preferably approximately the same length (X1 = X2 =). X3). As a result, with the rear flap _WB folded, as shown in FIG. 5, the barrier provided by the folded rear flap _WB is within approximately the width of the side nonwoven fabric 7 arranged on both sides of the main body absorber 10. 14 will be formed.

The number of fold lines is not particularly particular as long as it is two or more. Further, the number of fold lines may be an even number or an odd number. As shown in FIGS. 4 and 5, in the case of an even number, the skin side surface of the layer (second folded portion 18) located closest to the skin side is the side non-woven fabric 7 in the state where the rear flap _WB is folded. It is preferable in that it becomes a side surface and the absorption of body fluid on the skin contact surface of the barrier 14 can be ensured. On the other hand, when the number of fold lines is an odd number, the skin contact surface of the layer on the skin side is the surface on the impermeable back sheet 2 side, but the tip 16 in the width direction of the rear flap _WB is. Since it faces inward, the entire surface of the outer surface of the barrier 14 in the width direction is covered with the impermeable back sheet 2, which is preferable in that the leakage of body fluid from the barrier 14 to the outside in the width direction can be reliably prevented. ..

The temporary fixing means may be any one that can be easily released by hand, and is preferably composed of any one of the pressing portion 12 and the adhesive portion 13 or a combination thereof. This prevents the folded state of the rear flap _WB from unintentionally unfolding. In the embodiment shown in FIGS. 4 and 5, both the squeezing portion 12 and the adhesive portion 13 are provided as the temporary fixing means, but the squeezing portion 12 alone or the adhesive portion 13 alone may be used.

The squeezed portion 12 is recessed over at least two layers of the three tri-folded layers by squeezing the folded rear flap _WB from the outer surface side of either or both of the skin side and the non-skin side. It is a dented part. As shown in FIG. 4, the squeezed portion 12 is not formed in a continuous linear shape, but preferably has a pattern in which a plurality of small dots are arranged at predetermined intervals. As a result, the squeezing portion 12 can be easily released by hand. In the example shown in FIG. 4, a plurality of circular dot-shaped embosses are arranged at predetermined intervals along the longitudinal direction of the menstrual napkin 1. The size of each of the squeezed portions 12 is preferably about 1 to 5 mm, and the number provided on the rear flap _WB on one side is preferably about 2 to 7.

The adhesive portion 13 is an adhesive layer made of a hot melt adhesive or the like provided between two adjacent folded portions of the folded rear flap _WB , and can be easily peeled off from at least one folded portion. It has become. As shown in FIG. 5, the adhesive portion 13 is preferably arranged between adjacent folded portions where the impermeable back sheets 2 face each other. As a result, the adhesive portion 13 can be used as a slip-preventing adhesive for shorts in a state where the adhesive portion 13 is released and the rear flap _WB is expanded. After the temporary fixing means is released, in order for the adhesive portion 13 to be present on a predetermined one of the impermeable back sheet 2 and 2 facing the adhesive portion 13, the adhesive portion 13 is peeled off from the outer surface of the other impermeable back sheet 2. It can be done by applying treatment. In the peeling treatment, a mold release treatment liquid such as a silicone resin, a fluororesin, or a tetrafluoroethylene resin is applied to the contact surface of the adhesive portion 13 of the other impermeable back sheet 2. It can be done by spraying or spraying. Further, the peeling treatment may be directly applied to the impermeable back sheet 2, or a separate sheet material or a material having low adhesive strength (film or the like) that has been peeled may be applied to the impermeable back sheet. It may be formed by sticking to a predetermined area of 2.

When both the squeezing portion 12 and the adhesive portion 13 are provided as the temporary fixing means, the squeezing portion 12 and the adhesive portion 13 do not overlap with each other in the thickness direction of the menstrual napkin 1, as shown in FIGS. 4 and 5. It is preferable to place it in a position. When these are arranged at positions overlapping in the thickness direction, the adhesive of the adhesive portion 13 may be melted by the heat generated when the pressed portion 12 is formed, and the shorts may not be used as a slip stopper.

When both the squeezing portion 12 and the adhesive portion 13 are provided as the temporary fixing means, as shown in FIGS. 4 and 5, the squeezing portion 12 is arranged inside the folded rear flap _WB in the width direction and described above. It is preferable to arrange the adhesive portion 13 on the outer side in the width direction. As a result, of the folded rear flap _WB , the inner portion in the width direction is temporarily fixed by the pressing portion 12, and the outer portion in the width direction is temporarily fixed by the adhesive portion 13, so that the rear flap _WB is folded and used. The folded state of the rear flap _WB is surely maintained even in the state, and the adhesive portion 13 is the outer portion in the width direction of the rear flap _WB in a state where these temporary fixing means are released and the rear flap _WB is expanded. Because it is arranged in, it becomes possible to prevent the deviation at the time of mounting more surely.

As shown in FIG. 3, the basis weight of the absorber 4 disposed on the rear flap _WB may be substantially constant or may be changed in the width direction of the menstrual napkin 1. When changing the basis weight in the width direction, for example, as shown in FIG. 6, the basis weight may be gradually lowered or raised from the inside to the outside in the width direction. It may be changed step by step at the boundary. When the basis weight is gradually changed in the width direction and the density is made substantially constant, a gradient in which the thickness changes along the width direction is provided. Such a change in the basis weight of the rear flap _WB is inside the inner fold line L1 in the width direction, specifically, at substantially the same position as the inner edge 7a of the side nonwoven fabric 7, or the edge 7a and the fold line. By continuously forming from the intermediate position with L1 to the outer end in the width direction of the rear flap _WB , the thickness of the absorber 4 disposed on the rear flap _WB is continuously and gradually increased. It is preferable to provide a changing linear gradient.

In FIG. 6A, the basis weight of the absorber 4 disposed on the rear flap _WB is gradually lowered from the inside to the outside in the width direction of the menstrual pad 1. As a result, when the rear flap _WB is in use, the absorption capacity is higher on the inner side in the width direction, and more body fluid can be absorbed and held, so that leakage from both sides of the buttocks can be prevented more reliably and the body fluid can be prevented. The diffusion area of can be suppressed to the smallest possible range.

In FIG. 6B, the basis weight of the absorber 4 arranged on the rear flap _WB gradually increases from the inside to the outside in the width direction of the menstrual pad 1. As a result, in the used state where the rear flap _WB is folded, the absorption capacity of the folded portion closer to the skin surface is higher, so that the function of the folded portion as a barrier can be more reliably exerted.

Next, a means for eliminating the difficulty of folding due to the presence of the absorber 4 in the rear flap _WB and preventing the folding habit when the rear flap _WB is deployed will be described. In this menstrual napkin 1, since the absorber 4 is also interposed in the rear flap _WB , it is difficult to fold back due to the bending rigidity of the absorber 4, and the folded-back end portion becomes thicker or harder. , There is a risk that the fit will deteriorate. In addition, when the temporary fixing means is released and the rear flap _WB is unfolded, the rear flap _WB has a bellows-like unevenness due to the folding habit, which deteriorates the wearing feeling and the adhesion to the skin surface. May lead to leakage. Therefore, it is preferable to solve these problems by the following means.

As a first means, as shown in FIG. 7, the absorber 4 is located at the position of the fold lines L1 and L2 of the absorber 4 arranged on the rear flap _WB , along the fold lines L1 and L2. A low basis weight portion 19 having a low basis weight can be provided. The low basis weight portion 19 is a portion formed in the longitudinal intermediate portion of the absorber 4 existing on the fold lines L1 and L2, and the basis weight of the absorber 4 is continuously or intermittently lowered. The low basis weight portion 19 is formed with respect to the absorber 4 in the intermediate portion in the longitudinal direction of the menstrual pad 1 along the fold lines L1 and L2, and is the same as the other portions at both ends in the longitudinal direction of the napkin. Absorber 4 is present by basis weight. Therefore, the continuity of the absorber 4 is ensured, and the body fluid easily diffuses between the main body absorber 10 and the flap absorber 11. In the low basis weight portion 19, the absorber 4 is not present or is formed with a lower basis weight than the other portions. As a result, the rear flap _WB is easily bent at the folding lines L1 and L2 with the low basis weight portion 19 as the flexible shaft, and the folding habit is less likely to occur in the unfolded state. Further, when the body fluid flows into the low basis weight portion 19, it is absorbed at once by the lower layer side (impermeable back sheet 2 side) of the absorber 4, so that the diffusivity of the body fluid can be improved.

As a second means, as shown in FIGS. 8 and 9, the absorber disposed on the rear flap _WB is placed in the width direction of the menstrual napkin 1 at the positions of the folding lines L1 and L2. It is divided. That is, intermittent portions of the absorbers that penetrate the absorber 4 in the longitudinal direction of the napkin along the fold lines L1 and L2 are provided at the positions of the fold lines L1 and L2, respectively. As a result, the absorber does not exist at the folded end portion, the folded lines L1 and L2 are easily folded, and the folding habit is less likely to occur. By dividing the absorber, the body fluid absorbed by the main body absorber 10 is suppressed from diffusing outward at once in the width direction, and the possibility of the body fluid leaking from the width side edge of the rear flap _WB can be reduced. When the absorber is divided, the basis weight of each divided absorber does not have to be constant and can be set arbitrarily. For example, the basis weight of the split absorber on the outer side in the width direction may be lower or higher. Further, by making the basis weight of the split absorber located on the outermost side in the width direction the highest, the absorption capacity of the folded portion which becomes the skin contact surface in the used state where the rear flap _WB is folded is increased, and the rear flap W is increased. The absorption capacity of the outer portion in the width direction may be increased in the used state in which _B is expanded. In this way, by arbitrarily setting the basis weight of each split absorber, the height of the barrier 14 and the absorption capacity of each part can be arbitrarily set in the used state in which the rear flap _WB is folded. ..

When the absorber 4 disposed on the rear flap _WB is divided in the width direction of the menstrual napkin 1 at the positions of the folding lines L1 and L2, the divided absorbers are divided as shown in FIG. It is preferable that they are not directly joined to each other. That is, each split absorber is bonded to the side nonwoven fabric 7 on the skin side and to the impermeable back sheet 2 on the non-skin side with a hot melt adhesive or the like, whereby the side nonwoven fabric 7 and the impermeable back sheet are bonded. Although they are indirectly connected via 2, these split absorbers are not directly bonded to each other, and a space portion is formed between adjacent split absorbers, and the skin side and the non-skin side of the space portion are formed. The sides are covered with the side non-woven fabric 7 and the impermeable back sheet 2, respectively. In FIG. 9, x marks indicate the joints formed by the adhesive. By forming a space between the split absorbers in this way, the body fluid that has flowed into the space is absorbed by the lower layer side (impermeable back sheet 2 side) of each split absorber. , The diffusion of the absorber in the thickness direction becomes good.

In the example shown in FIG. 1, the shape of the outline of the rear flap _WB is formed by a curve that bulges outward in the width direction with an emphasis on fit to the buttocks, but is limited to this. Instead, it can be formed in any shape. For example, as shown in FIG. 10, by forming a trapezoidal shape or a rectangular shape that bulges outward in the width direction, a wider range of the buttocks can be covered in the used state where the rear flap _WB is expanded. You may do it. Further, in the state where the rear flap _WB is expanded, the wing-shaped flap W forms the maximum width (the width dimension that becomes the maximum in the width direction of the menstrual napkin 1) in the longitudinal section in which the rear flap _WB is formed. It is preferably larger than the maximum width in the lengthened section. This allows a wider area of the buttocks to be covered when the rear flap _WB is in use, and a barrier 14 high enough to block body fluids when the rear flap _WB is folded. Can be formed.

Next, in the state of use in which the rear flap _WB is expanded, the body fluid is efficiently diffused to the absorber 4 disposed on the rear flap _WB so that the absorption capacity of the absorber 4 can be effectively utilized. A form in which the embossed groove 20 is provided will be described. As shown in FIGS. 11 to 13, the embossed groove 20 is formed in a linear shape extending from the main body absorber 10 toward the flap absorber 11. The embossed groove 20 is composed of at least a recessed portion in which the absorber 4 is recessed, and the pressing direction thereof can be from either or both of the skin side and the non-skin side. In particular, from the viewpoint of improving the diffusivity of the body fluid along the embossed groove 20 and the ease of deformation of the napkin, the embossed groove 20 is integrated from the skin contact surface side of the sanitary napkin 1 to the absorber 4. It is preferably formed by a recessed portion that is recessed toward the non-skin side (impermeable back sheet 2 side). Further, the embossed groove 20 may be formed by a continuous line composed of continuous recessed portions, or may be formed by intermittent lines in which a plurality of recessed portions and non-recessed portions are alternately arranged along the groove direction. good.

A specific embodiment of the embossed groove 20 will be described with reference to FIGS. 11 to 13. In FIG. 11, the embossed groove 20 is formed by a straight line gradually inclined to the rear side from the intermediate portion in the width direction of the main body absorber 10 toward the outside in the width direction, and is formed on both sides of the longitudinal center line CL of the sanitary napkin 1. They are arranged in pairs on the left and right, separated from each other in the longitudinal direction. It is preferable that the direction in which each embossed groove 20 extends is substantially parallel to the tangent line S of the outer line of the napkin at the point where the central portion thereof intersects with the virtual line T in the width direction of the napkin. As a result, the portion between the embossed groove 20 and the outer line of the napkin is formed to have a substantially equal width in the section of the embossed groove 20, and the main body absorber is formed along the absorber portion formed to have the substantially equal width. The body fluid absorbed by 10 is efficiently guided to the rear flap _WB . Further, a plurality of embosses arranged apart from each other in the longitudinal direction of the menstrual napkin 1 so that the body fluid diffused from the front side to the rear side in the longitudinal direction of the menstrual napkin 1 is dispersed and guided in the width direction. Of the grooves 20, the edges on the inner side in the width direction (CL side of the center line in the longitudinal direction) are substantially aligned with the width direction of the menstrual napkin 1 (aligned in the longitudinal direction of the menstrual napkin 1). ) Or the embossed groove 20 arranged on the rear side is preferably located on the inner side in the width direction (CL side of the center line in the longitudinal direction). On the other hand, the outer edge in the width direction of the embossed groove 20 is located inside the inner edge 7a in the width direction of the side nonwoven fabric 7 in the illustrated example, but the edge 7a and the inner folding line L1 It may be located in between. Further, the embossed groove 20 may be formed by a curve that bulges outward or a curve that bulges inward, similar to the outer line of the napkin.

Next, in the embodiment shown in FIG. 12, the embossed groove 20 is formed by a straight line parallel to the width direction of the menstrual napkin 1 from the intermediate portion in the width direction of the main body absorber 10, and is the longitudinal center line of the menstrual napkin 1. A plurality of left and right pairs are arranged on both sides of the CL, separated from each other in the longitudinal direction of the menstrual napkin 1. As a result, the body fluid that diffuses toward the rear side is blocked by the embossed groove 20, and easily diffuses to the rear flap _WB along the embossed groove 20. Further, when the menstrual napkin 1 is curved in the front-rear direction along the roundness of the front and back of the body, the embossed groove 20 extending in the width direction becomes a flexible axis and easily bends. The embossed groove 20 may be formed to have a longer length as it is arranged on the rear side, so that the embossed groove 20 arranged on the rear side has a higher effect of blocking the body fluid. Further, the embossed groove 20 may be formed by a curved line that bulges forward or backward.

In the embodiment shown in FIGS. 11 and 12, two embossed grooves 20 are arranged on the left and right sides, but as shown in FIG. 13, the rear side portion on the rear side of the wing-shaped flap W is longer. In some cases, three or more may be formed, and in the illustrated example, three may be formed. The number of the embossed grooves 20 is preferably 2 to 8 on each side, preferably 2 to 5 on each side.

By the way, as the superabsorbent polymer constituting the absorber 4, the same one may be used for the main body absorber 10 and the flap absorber 11, or different ones may be used. As an example of using different ones, as the superabsorbent polymer of the flap absorber 11, a polymer having a higher absorption rate than the superabsorbent polymer of the main body absorber 10 can be used. As a result, when the body fluid diffuses into the flap absorber 11, the superabsorbent polymer quickly absorbs the body fluid and more reliably prevents leakage from the edge in the width direction.

Further, the density of the absorber 4 may be substantially the same between the main body absorber 10 and the flap absorber 11, and the body fluid is likely to diffuse from the low density region to the high density region due to the capillary action accompanying the density difference of the fibers. May be used to form the flap absorber 11 at a higher density than the main body absorber 10. In order to form the flap absorber 11 at a higher density than the main body absorber 10, the pulp fiber of the flap absorber 11 should have a smaller fiber diameter, a shorter fiber diameter, or a flexible one than the pulp fiber of the main body absorber 10. Can be made by. Since the body fluid that diffuses the absorber 4 has the property of easily diffusing into a high-density region due to the capillary action, the above-mentioned pulp fiber having a small fiber diameter, a short fiber diameter, or a flexible one is used to have a high density. The body fluid easily diffuses into the flap absorber 11.

[Examples of other forms]
As shown in FIG. 14, when the hydrophilic second sheet 6 is arranged between the liquid permeable surface sheet 3 and the absorber 4, at least the second sheet 6 is connected to the side nonwoven fabric 7 of the rear flap _WB . It is preferable to extend the arrangement between the absorber 4 (flap absorber 11) and the absorber 4. As a result, even in the rear flap _WB , the body fluid easily permeates from the side nonwoven fabric 7 into the flap absorber 11. In particular, as shown in the illustrated example, the liquid-permeable surface sheet 3 is diffused by arranging the liquid-permeable surface sheet 3 and the second sheet 6 extending between the side non-woven fabric 7 and the flap absorber 11. It is preferable that the body fluid is easily transferred to the rear flap _WB , but the liquid-permeable surface sheet 3 may have an absorber width at the body fluid discharge portion H, and only the second sheet 6 may be extended laterally.

The second sheet 6 may be any as long as it has hydrophilicity with respect to body fluids. Specifically, a material having hydrophilicity by using recycled fibers such as rayon and cupra and natural fibers such as cotton is used, or olefin-based, polyester-based, polyamide-based fibers such as polyethylene or polypropylene are synthesized. Fibers obtained by surface-treating the fibers with a hydrophilizing agent to impart hydrophilicity can be used. Further, the second sheet 6 may have a porous film layer on the back surface side (absorbent body 4) in order to have elasticity, may be a laminated sheet with an encapsulating sheet, and may further contain pulp. Materials containing may be used.

1 ... sanitary napkin, 2 ... impermeable back sheet, 3 ... liquid permeable front sheet, 4 ... absorber, 5 ... embossed sheet, 6 ... second sheet, 7 ... side non-woven fabric, 10 ... body absorber, 11 ... Flap absorber, 12 ... Squeezing part (temporary fixing means), 13 ... Adhesive part (temporary fixing means), 14 ... Barrier, 19 ... Low grain part, 20 ... Embossed groove

Claims (8)

An absorbent article with a rear flap that can be extended outwards on both sides of the rear.
An absorber is arranged on the rear flap, and the rear flap is provided along the longitudinal direction of the absorbent article and at a predetermined interval in the width direction of the absorbent article by two or more folding lines. An absorbent article characterized in that it is folded to the skin side and its state is maintained by temporary fixing means. The absorbent article according to claim 1, wherein the temporary fixing means is composed of any one of a squeezed portion and an adhesive portion or a combination thereof. The absorbent article according to any one of claims 1 and 2, wherein the basis weight of the absorber disposed on the rear flap changes along the width direction of the absorbent article. The absorber disposed on the rear flap is according to any one of claims 1 to 3, wherein a low basis weight portion having a low basis weight of the absorber is provided at the position of the fold line along the fold line. Absorbent article. The absorbent article according to any one of claims 1 to 3, wherein the absorber disposed on the rear flap is divided in the width direction of the absorbent article at the position of the fold line. The absorbent article according to claim 5, wherein the divided absorbers are not directly bonded to each other, and a space portion is formed between the adjacent absorbers . Claimed to form an embossed groove in which the absorber is recessed, extending from the main body absorber disposed in the area including the body fluid draining portion of the wearer toward the absorber disposed on the rear flap. The absorbent article according to any one of 1 to 6. The absorbent article according to any one of claims 1 to 7, wherein side nonwoven fabrics are disposed on both sides on the skin side, and the rear flap is folded within the width in which the side nonwoven fabrics are arranged.

Images