CN1981721B - Absorbency substance - Google Patents

Abstract

In an absorbent article provided with three-dimensional gathers having a substantially ㄑ-shaped cross section, by making the three-dimensional gathers more likely to face outward, it is possible to prevent free parts from falling inward, and it is possible to reliably prevent lateral leakage of menstrual blood or the like. The three-dimensional pleats (BS) have a cross-sectional shape with a first free portion (12) facing outward in the width direction and a second free portion (13) continuous with the first free portion (12) and facing inward in the width direction. The bonding of the first free part and the second free part on the front and rear parts in the longitudinal direction of the napkin is such that the bonding end position of the inner part within the bonding width is closer to the sanitary napkin than the bonding end position of the outer part. (1) on the front and rear end sides, the inner position of the bonding part is changed for bonding, and the first free part (12) except the bonding of the front and rear parts in the longitudinal direction of the sanitary napkin (1) In addition, the middle portion is also bonded to the surface side of the sanitary napkin (1) at one or more locations.

Description

absorbent article

technical field

The present invention relates to absorbent articles such as sanitary napkins, panty liners, and incontinence pads for absorbing menstrual blood and leucorrhea, and more particularly, to absorbent articles with three-dimensional pleats having a high horizontal leakage prevention effect.

Background technique

Conventionally, as absorbent articles such as sanitary pads, sanitary napkins, and incontinence pads, liquid-impermeable back sheets such as non-woven fabrics laminated with polyethylene or polypropylene and non-woven fabrics or liquid-permeable plastics are known. A structure in which an absorbent body made of cotton-like pulp is interposed between a liquid-permeable top sheet such as a sheet.

Many improvements have been made to such absorbent articles, and many solutions for preventing leakage of body fluids have been proposed. As one of these methods for preventing leakage of bodily fluids, there is a structure in which three-dimensional gathers for preventing lateral leakage are provided on both sides of the surface side. For example, in the following Patent Document 1 and the following Patent Document 2, there are disclosed as gathers having a first free portion facing outward in the width direction and a second free portion folded between the front end of the free portion and facing inward in the width direction. Sculpted pleats.

Patent Document 1 JP-A-2001-95844

Patent Document 2 JP-A-2004-24310

Contents of the invention

Yet when adopting the three-dimensional pleat structure that the above-mentioned section "k" shape stands up, although there is the advantage that can guarantee the stand height greatly, as shown in Figure 13, when wearing state, if stand up part (free part) becomes In the state of being poured inward, the surface of the sanitary napkin may be covered, and the effective absorption width may be extremely narrowed. In addition, if menstrual blood or the like is discharged to the upper surface of the three-dimensional gathers in this state, lateral leakage may occur directly along the upper surface side of the gathers.

On the other hand, according to follow-up surveys, there are many cases where, depending on the user, menstrual blood adheres to the trousers (足回り) of the underwear, and there are many cases where the three-dimensional pleats are forced to expand outward.

Therefore, the main object of the present invention is to provide an absorbent article having three-dimensional gathers having a first free portion rising outward in the width direction from the surface, and a first free portion continuous with the first free portion. In the second free portion facing inward in the width direction, by making the three-dimensional gathers easy to face outward, it is possible to prevent the free portion from pouring inward, and it is possible to reliably prevent lateral leakage of menstrual blood or the like.

As a first technical solution of the present invention for solving the above-mentioned problems, there is provided an absorbent article in which an absorbent body is interposed between a liquid-permeable top sheet and a liquid-impermeable back sheet, and the two sides of the surface side are respectively Form three-dimensional pleats, and the three-dimensional pleats have a cross-sectional shape with a first free part that faces outward or stands up in the width direction from the surface, and a second free part that is continuous with the first free part and faces inward in the width direction. One or more elastic elastic members are arranged on the first free part and/or the second free part along the longitudinal direction of the absorbent article. The above-mentioned first free part and the second free part are connected, and the above-mentioned first free part is bonded to the surface side from the front and rear ends to a predetermined inner position, and it is characterized in that the above-mentioned first free part on the front and rear parts in the longitudinal direction of the absorbent article The bonding of the part and the second free part is such that the bonding terminal position of the inner part within the bonding width is located at the front and rear end sides of the absorbent article than the bonding terminal position of the outer part, and the inner side of the bonding part Bonding is performed in a changed position, and the above-mentioned first free portion is bonded to the surface side of the absorbent article at one or more places in its middle portion in addition to the above-mentioned bonding at the front and rear portions in the longitudinal direction of the absorbent article. .

In the invention according to claim 1, there is provided an absorbent article having three-dimensional gathers having a substantially K-shaped cross section, the three-dimensional gathers having a first free portion facing outward in the width direction, and a K-shaped gap between the front end of the free portion. In this absorbent article, the above-mentioned first free portion and the second free portion on the front and rear portions in the longitudinal direction of the absorbent article are bonded so that the bonding width is inward In such a manner that the inner portion is located on the front and rear end sides of the absorbent article than the outer portion, the inner position of the adhesive portion is changed to be bonded. In addition, the middle portion is also bonded to the surface side of the absorbent article at one or more locations, the standing of the first free portion is restricted, and the second free portion stands in a nearly vertical standing state. Therefore, in the worn state, the free portion does not fall inward of the inner edge of the gathers and does not cover the absorber. In addition, since it is easy to fall to the outside, and the inner surface side of the second free portion is in contact with the skin surface, lateral leakage can be prevented.

As a second aspect of the present invention, there is provided the absorbent article according to the first aspect, wherein the bonding of the middle portion of the first free portion is only the bonding of the outer portion in the width direction, and the first free portion The middle of the width direction of the absorbent article is arranged along the length direction of the elastic elastic member.

In the invention described in claim 2 above, the elastic stretchable member disposed in the middle of the width direction of the first free portion along the longitudinal direction of the absorbent article has the upper surface of the first free portion that is to be restrained from standing upward. The function of the square side is pushed up, so when the second free part is tilted to the outside and worn, the above-mentioned pushed-up part of the first free part is in close contact with the skin, thereby preventing lateral leakage.

As a third aspect of the present invention, there is provided the absorbent article according to the first or second aspect, wherein the above-mentioned elastic stretchable parts arranged on the first free part and/or the second free part along the longitudinal direction of the absorbent article are provided. There are multiple parts, and it is set so that the expansion and contraction force gradually becomes smaller as it goes toward the front end side of the free part,

In the invention of the above-mentioned claim 3, for the elastic stretchable member disposed on the three-dimensional gathers, the stretching force is gradually reduced as it moves toward the front end side of the free part, so that the compatibility with the trouser legs can be improved. Good and prevents outward facing drape from returning to the inside.

As claim 4 of the present invention, there is provided the absorbent article according to any one of claims 1 to 3, which further has a third free portion that is continuous from the front end of the second free portion and is folded toward the opposite side.

As a fifth aspect of the present invention, there is provided the absorbent article according to the fourth aspect, wherein the inner surface side of the third free portion is subjected to anti-slip processing or is attached with an anti-slip material.

In the invention described in claim 5, when wearing the underwear, the thigh portion abuts against the anti-slip portion of the third free portion, so that the standing gathers can be easily worn by tilting outward.

As described above, according to the present invention, there is provided an absorbent article provided with three-dimensional gathers, the three-dimensional gathers having a first free portion that faces outward in the width direction or stands up from the surface, and a In the second free portion on the inner side in the width direction, by making the three-dimensional gathers easy to face outward, it is possible to prevent the free portion from pouring inward, and it is possible to reliably prevent lateral leakage of menstrual blood and the like.

Description of drawings

Fig. 1 is a developed view of a sanitary napkin 1 according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view thereof (view taken along line II-II in FIG. 1 ).

FIG. 3 is a cross-sectional view thereof (view taken along the line III-III in FIG. 1 ).

Fig. 4 is a schematic diagram of the three-dimensional gathers BS.

Fig. 5 is a plan view showing the bonding structure of the first free portion 12 and the second free portion 13 at the front and rear portions in the longitudinal direction of the sanitary napkin.

Fig. 6 is a plan view showing the bonding structure of the first free portion 12 to the surface of the sanitary napkin.

Fig. 7 is a plan view showing a standing state of the three-dimensional gathers BS of the present invention.

Fig. 8 is a main part cross-sectional view showing another embodiment (No. 1) of the three-dimensional gathers BS of the present invention.

Fig. 9 is a main part cross-sectional view showing another embodiment (No. 2) of the three-dimensional gathers BS of the present invention.

Fig. 10 is a main part cross-sectional view showing another embodiment (No. 3) of the three-dimensional gathers BS of the present invention.

Fig. 11 is a main part cross-sectional view showing another embodiment (No. 4) of the three-dimensional gathers BS of the present invention.

Fig. 12 is a main part cross-sectional view showing another embodiment (No. 5) of the three-dimensional gathers BS of the present invention.

Fig. 13 is a diagram for explaining problems of the conventional three-dimensional gathers BS.

Detailed ways

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

Fig. 1 is a developed view of a sanitary napkin 1 according to the first embodiment of the present invention, and Fig. 2 is a view taken along the line II-II of Fig. 1 . Fig. 3 is a III-III arrow view of Fig. 1 .

The above-mentioned sanitary napkin 1 mainly includes: a liquid-impermeable back sheet 2 made of polyethylene sheet, etc.; a liquid-permeable top sheet 3 that can quickly pass through menstrual blood or leucorrhea; sandwiched between the two thin sheets 2, 3 Absorbers 4, 6 made of cotton-like pulp or synthetic pulp in between; crepe paper 5 surrounding the absorber 4 in order to improve the shape retention and diffusibility of the absorber 4; and a pair of left and right three-dimensional pleats BS, The BS has the substantially side edge portion of the above-mentioned absorbent body 4 as an upright base end, protrudes toward the surface side in a predetermined section at least from the body fluid discharge portion R in the front-rear direction, and is provided around the absorbent body 4 . The upper and lower edge portions, the outer edge portions of the above-mentioned liquid-impermeable back sheet 2 and the liquid-permeable top sheet 3 are joined by adhesive means such as hot melt, heat sealing, etc. The above-mentioned liquid-impermeable back sheet 2 extending to the side of the absorber 4 and the side non-woven fabric 7 forming the above-mentioned three-dimensional gathers BS are joined by adhesive means such as hot-melt and heat-sealing. The laminated sheet portion formed by the liquid-impermeable back sheet 2 and the side nonwoven fabric 7 forms wing-shaped flaps W, W protruding laterally, and a second wing-shaped flap is formed on a portion located on the buttock side. Wing W _B , W _B .

The structure of the sanitary napkin 1 will be further described in detail below.

The aforementioned liquid-impermeable back sheet 2 uses a sheet material having at least water barrier properties such as polyethylene, but in recent years there is a tendency to use a material having moisture permeability from the viewpoint of preventing mildew. As the water-repellent and moisture-permeable sheet material, a sheet obtained by melting and mixing an inorganic filler into an olefin resin such as polyethylene or polypropylene to form a sheet and stretching in a uniaxial or biaxial direction is suitable for use. microporous sheets. One or more adhesive layers (not shown) are formed on the non-use side (outer surface) of the liquid-impermeable backsheet 2 to fix the sanitary napkin 1 to the underwear when worn on the body.

Next, the above-mentioned liquid-permeable top sheet 3 is preferably a non-woven fabric, a porous plastic sheet, or the like with or without holes. As raw material fibers constituting the nonwoven fabric, synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, for example, regenerated fibers such as rayon and cupro fibers, and natural fibers such as cotton can be used. , Non-woven fabrics obtained by appropriate processing methods such as spunlace, spunbond, thermal bonding, meltblown, and needle punching can also be used. Among these processing methods, the advantage of the spunlace method is that it is rich in softness and drapability, and the advantage of the thermal bonding method is that it is fluffy and soft. When a plurality of through holes are formed in the above-mentioned liquid-permeable top sheet 3, menstrual blood, leucorrhea, etc. (hereinafter collectively referred to as body fluids) can be quickly absorbed, and the dryness is excellent.

As the above-mentioned absorber 4 , it is only necessary that it can absorb and retain body fluids, and generally, fluffy pulp mixed with water-absorbing polymer powder is suitably used from the viewpoint of absorbing function and price. In order to maintain the shape and the like of the absorbent body 4 described above, it is preferably surrounded by crepe paper 5 .

In the central part on the upper surface side of the above-mentioned absorber 4, the mid-high absorber 6 is arranged along the longitudinal direction. If the thickness of the mid-high absorber 6 is too thick, the rigidity of the absorber 4 increases and the adhesion to the body decreases, so it should be 3 to 20 mm, preferably 5 to 15 mm.

On the other hand, the width dimension of the above-mentioned liquid-permeable top sheet 3, in the illustrated example, as shown in the cross-sectional view of Fig. 2 and Fig. 3, is longer than the width of the absorber 4, only covers the absorber 4, and the above-mentioned three-dimensional pleats For the pleats BS, another side non-woven fabric 7 different from the liquid-permeable top sheet 3 is used. Specifically, in order to prevent menstrual blood, leucorrhea, etc. Or hydrophilic treatment of non-woven raw materials. As this side non-woven fabric 7, can use natural fiber, synthetic fiber or regenerated fiber etc. as raw material, the non-woven fabric formed by appropriate processing method, but preferably use has eliminated hard feeling, and in order to prevent mildew, Air-permeable nonwoven fabric with reduced basis weight. Specifically, it is preferable to use a non-woven fabric manufactured with a weight per unit area of 18 to 23 g/m ² , and in order to reliably prevent the penetration of body fluids, use a non-woven fabric coated with silicon, paraffin, alkyl chromium chloride (alkyl hromic chloride) type water repellent and other waterproof treated non-woven fabrics.

The above-mentioned side portion nonwoven fabric 7, as shown in FIGS. 2 and 3 , has a portion on the outside of the middle portion in the width direction from the position inside the absorber 4 slightly beyond the side edge of the absorber to the outer edge of the liquid-impermeable back sheet 2. Within the scope of bonding by hot-melt or other adhesives, through the laminated sheet portion of the side non-woven fabric 7 and the liquid-impermeable back sheet 2, the absorbent body roughly equivalent to the body fluid discharge portion H A pair of left and right wing-shaped flaps W, W are formed at the side portion, and second wing-shaped flaps W _B , W _B are formed at a position closer to the buttocks side. Adhesive layers 10..., 11... are respectively provided on the outer surface sides of these wing-shaped flaps W, W and the two wing-shaped flaps _WB , _WB . The position of the line RL is folded to the opposite side, rolled up and attached to the crotch part of the panties, and fixed.

(Structure of three-dimensional pleats)

The inner part of the above-mentioned side non-woven fabric 7 is roughly folded into two layers, and inside the two-layer sheet, an elastic elastic member 19 fixed at an appropriate position in the direction of the height direction is disposed at both ends or in the length direction, and, A plurality of elastic members 20 , 20 in the illustrated example are arranged on the upper portion of the elastic member 19 with both ends or fixed in appropriate positions in the longitudinal direction. As shown in FIG. 3, the two-layer sheet part is folded into a cross-sectional Z shape and laminated to the absorber 4 side at the front and rear ends, and the position where the elastic stretchable member 19 is arranged is used as a bending point to form a cross-section. Three-dimensional pleats BS, BS in the shape of a く.

Furthermore, three-dimensional gathers BS are demonstrated concretely based on FIG.4(A).

The above-mentioned three-dimensional gathers BS form a cross-sectional shape with a first free portion 12 facing outward in the width direction, and a second free portion 13 that is continuous with the first free portion 12 and folded in a k-shape and faces inward in the width direction. On the part 12 and/or the second free part 13, one or more elastic elastic members 19, 20 are arranged along the length direction of the sanitary napkin. In this example, an elastic member 19 is disposed on a curved portion that is a boundary between the first free portion 12 and the second free portion 13 , and two elastic members 20 , 20 are disposed on the second free portion 13 .

In addition, at the front and rear parts in the longitudinal direction of the sanitary napkin, as shown in FIG. The front and rear ends of the sanitary napkin are bonded to the specified inner position, and bonded to the surface side of the sanitary napkin 1 in a laminated state, and the three-dimensional pleats BS in the shape of a section are formed in the middle part by the stretching force from the above-mentioned elastic stretchable members 19, 20. , BS.

Although the structure of the three-dimensional pleats BS of the above-mentioned structure is a pleat structure especially used for night-time sanitary napkins, in the present invention, by improving the three-dimensional pleats BS, it is possible to prevent the standing part from standing up in the wearing state. (free part) pour inward. That is, as shown in FIG. 4(B), by making the three-dimensional gathers BS easy to face outward, the free parts 12 and 13 are prevented from falling inward, and lateral leakage of menstrual blood and the like can be reliably prevented.

Specifically, the adhesive structure of the first free portion 12 and the second free portion 13 on the front and rear of the sanitary napkin in the longitudinal direction, as shown in FIG. 5 , changes the inner position of the adhesive portion between the inner and outer sides. That is, by making the bonding terminal position _P1 of the inner part 14A within the bonding width be located on the front and rear end sides of the sanitary napkin than the bonding terminal position _P2 of the outer part 14B, the bonding can be performed in such a way that the bonding can be changed. The inner terminal line of the bonding part has an oblique inclination in a plan view, which can make the second free part 13 stand up toward the outside easily and naturally.

In addition, the bonding structure of the above-mentioned first free portion 12 to the surface of the sanitary napkin, as shown in FIG. The middle part is also bonded to the surface side (area 17 ) at one or more locations, in the illustrated example, one location.

As a result, in the three-dimensional gathers BS, as shown in FIG. 7 , the standing up of the first free portion 12 is restricted, and the second free portion 13 stands up in a substantially vertical standing state. Therefore, in the worn state, the free portion does not fall inside the inner edge of the gathers and does not cover the absorber 4 . In addition, lateral leakage can be prevented by making it easy to fall outward so that the inner surface side of the second free portion 13 is in contact with the skin surface. Furthermore, in the state of being tilted outward, the contact area with the skin is also increased, so it is possible to fundamentally prevent menstrual blood from adhering to the trouser legs of the panties.

(Examples of other embodiments)

(1) In the above-mentioned embodiment, the elastic elastic parts arranged on the three-dimensional gathers BS are the middle folded part and its upper side part, but as shown in Fig. 6 and Fig. 8, it is also possible to make the above-mentioned first free part 12 The bonding of the middle part is only the bonding of the outer part in the width direction, and the elastic elastic member 18 is arranged along the length direction of the sanitary napkin 1 in the middle of the width direction of the first free part 12 . The above-mentioned elastic elastic member 18 has the function of pushing up the upper surface of the first free part 12 that is restricted from erecting to the upper side. Therefore, in the state where the second free part 13 is tilted outward and worn, the first free part 18 The raised portion of the portion 12 is in close contact with the skin, thereby preventing horizontal leakage.

(2) As shown in FIG. 9, for the elastic stretchable members arranged on the three-dimensional gathers BS, the stretching force is set to gradually decrease as the movement toward the front end side of the free parts 12, 13, so that the The compatibility with the trousers is good, and the second free portion 13 facing outwards can be prevented from returning to the inner side.

(3) In the above-mentioned embodiment, only the above-mentioned first free part 12 is partially bonded to the surface of the sanitary napkin, but as shown in FIG. That is, the range involving the second free portion 13 is adhered to the surface of the sanitary napkin, so that the above-mentioned second free portion 13 can stand up toward the outside in a natural state.

(4) The three-dimensional gathers BS, as shown in FIG. 11 , may further have a third free portion 21 that is continuous from the front end of the second free portion 13 and is folded to the opposite side. At this time, anti-slip processing may be performed on the inner surface side 22 of the third free portion 21, or an anti-slip material may be attached. As the anti-slip processing, for example, corrugating the side nonwoven fabric 7 along the lengthwise direction of the pleats, or attaching a corrugated nonwoven fabric may be sufficient. When wearing the underpants, the thighs will abut against the anti-slip part of the third free part 21, and it is easy to make the standing pleats fall to the outside for wearing.

(5) In the above-mentioned embodiment, the three-dimensional gathers BS is a cross section having the first free portion 12 facing outward in the width direction from the surface, and the second free portion 13 continuous with the first free portion 12 and facing inward in the width direction. However, as shown in FIG. 12(A), it will have a first free portion 12 standing up from the surface and a second free portion 13 continuous with the first free portion 12 and facing inward in the width direction in a three-dimensional shape. The present invention can also be applied to the gathers BS. And then as shown in Fig. 12 (B), the first free portion 12 which stands up from the surface, the second free portion 13 which is continuous with the first free portion 12 and faces inward in the width direction, also has the second free portion 13 from the first free portion simultaneously. The present invention can also be applied to three-dimensional gathers BS having a substantially T-shaped cross section of the third free part 23 whose top part 12 extends to the opposite side from the second free part 13 .

Claims (4)

1. An absorbent article, in which an absorbent body is interposed between a liquid-permeable top sheet and a liquid-impermeable back sheet, and three-dimensional gathers are respectively formed on both sides of the surface side, and the three-dimensional gathers have a direction from the surface toward The cross-sectional shape of the first free part standing on the outside or erected in the width direction, the second free part continuous with the first free part and facing inward in the width direction, and along the first free part and/or the second free part One or more elastic elastic members are arranged along the longitudinal direction of the absorbent article, and the three-dimensional gathers are bonded to the first free part and the second free part respectively from the front and rear ends to the predetermined inner positions at the front and rear parts in the longitudinal direction. , and the first free portion is bonded to the surface side from the front and rear ends to a predetermined inner position, wherein, The bonding of the first free portion and the second free portion on the front and rear portions in the longitudinal direction of the absorbent article is carried out so that the bonding end position of the inner portion within the bonding width is located closer to the absorption end position than the bonding end position of the outer portion. The front and rear end sides of the sexual article are bonded by changing the inner position of the bonding part, In addition to the bonding of the front and rear parts in the longitudinal direction of the absorbent article, the first free part is also bonded to the surface side of the absorbent article at one or more places in its middle part, and the first free part The bonding of the middle part of the part is only the bonding of the outer part in the width direction, and the elastic stretchable member is arranged along the longitudinal direction of the absorbent article in the middle of the width direction of the first free part. 2. The absorbent article according to claim 1, wherein the elastic stretchable members disposed on the first free portion and/or the second free portion along the longitudinal direction of the absorbent article are multiple, and are set As it goes toward the front end of the free part, the stretching force gradually decreases, 3. The absorbent article according to claim 1 or 2, further comprising a third free portion that continues from the front end of the second free portion and is folded toward the opposite side. 4 . The absorbent article according to claim 3 , wherein the inner surface side of the third free portion is subjected to anti-slip processing or is attached with an anti-slip material.

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