KR101205578B1 - Absorbent article - Google Patents

Abstract

A rear flap 5 on each of the two sides of the longitudinal rear portion disposed on the back side of the wearer, having a surface layer 2, a back layer 3, and a main body absorbing layer 4 disposed between these two layers. As the absorbent article 1 having, the flap portion absorbing layer 4S is disposed on the rear flap 5, and the sheet member 6 having a part of the upper surface of the flap portion absorbing layer 4S on the upper surface of the main body absorbing layer 4. The sheet member 6 is made of a water-repellent nonwoven fabric, and a portion located on the upper surface of the main body absorbent layer 4 has water repellency, and at the same time the flap portion absorbent layer 4S is provided. The cover portion has an emboss portion 67 which is pressed together with the flap portion absorbing layer 4S, is formed in a concave shape, and is combined with the flap portion absorbing layer 4S.

Sanitary napkins, panty liners, incontinence pads, absorbent articles

Description

[0001] ABSORBENT ARTICLE [0002]

BRIEF DESCRIPTION OF THE DRAWINGS It is a top view which shows the sanitary napkin as one Embodiment of this invention.

FIG. 2 is a cross-sectional view taken along the line II of FIG. 1. FIG.

3 is a partially enlarged view of FIG. 2 showing an enlarged vicinity of an embossed portion.

It is a partial top view which shows the rear flap part of the sanitary napkin of other embodiment of this invention.

The present invention relates to absorbent articles such as sanitary napkins, panty liners (secretory sheets), and incontinence pads.

Background Art It has conventionally been known to have a rear flap disposed on the inner surface (skin facing surface) of clothing such as panties on each of both side portions of the longitudinal rear portion disposed on the back side of the wearer as a sanitary napkin. Such a rear flap prevents the generation of so-called back glands, in which fluid such as acupuncture points, etc., move to the back side and leak out during the wearing. It is also known to arrange a water resistant sheet material on both the left and right sides of a sanitary napkin having such a rear flap to form a barrier for leakage prevention.

For example, Japanese Laid-Open Patent Publication No. 2002-219144 (hereinafter referred to as Document 1) forms a leakage preventing sidewall with a sheet member for forming a leakage preventing sidewall, and at the same time, The sanitary napkin which extended the said sheet | seat material and a back sheet from the both edges of an absorber, and formed the back flap is described. It is described in this document 1 to arrange | position a sub absorber on a rear flap.

In addition, Japanese Laid-Open Patent Publication No. 2003-290277 (hereinafter referred to as Document 2) describes a sanitary napkin in which a recess for fixing liquid is formed on at least the skin surface side surface of the rear flap.

Furthermore, Japanese Unexamined Utility Model Publication No. 7-3622 (hereinafter referred to as Document 3) is not a rear flap, but is an absorbent core of the main body portion in a flap (wing part) provided in the longitudinal center portion of the napkin. The sanitary napkin which arrange | positioned another flap absorbent shim and made it possible to absorb liquid from the skin surface side surface of a flap is described.

However, in the sanitary napkin described in Document 1, since the surface of the rear flap is formed by the sheet material for forming the leakage preventing side wall, the liquid absorbed by the main absorber is between the sheet material for forming the leakage preventing side wall and the back sheet. Although the transfer to the subabsorber of the rear flap is sometimes carried out, the liquid that has reached the rear flap beyond the leakage preventing sidewall cannot be absorbed and retained by the rear flap or the subabsorber. The same document discloses that it is also possible to use a perforated nonwoven fabric or a hydrophilic nonwoven fabric as the sheet member for forming the leakage preventing side wall, but in this case, the leakage preventing effect due to the leakage preventing side wall is significantly impaired. It becomes.

In addition, in the sanitary napkin described in Document 2, the diffusion of the liquid on the rear flap can be reduced to some extent by the recesses for fixing the liquid, but the movement of the wearer is not provided because the liquid retaining absorbent layer is not disposed on the rear flap. There is a possibility that leakage may occur in severe cases or when worn for a long time.

In addition, in the sanitary napkin described in Document 3, the entire upper surface of the absorbent shim of the main body portion is covered with a liquid permeable surface sheet, and since the upper surface of the side of the absorbent shim is not covered with a water-resistant material, the liquid moves along the surface sheet. It is easy to do it and becomes easy to leak.

Accordingly, it is an object of the present invention to provide an absorbent article which can effectively prevent the liquid from leaking from the rear flap and the movement of the liquid onto the rear flap, thereby providing excellent leakage preventing properties.

The present invention is an absorbent article having a front layer, a back layer, and a main body absorbing layer disposed between these two layers, and having a rear flap on each of both side portions of the longitudinal rear portion disposed on the back side of the wearer, wherein the flap portion absorbing layer is disposed on the rear flap. The upper surface of the flap portion absorbing layer is covered by an extension of a sheet member having a portion on the upper surface of the main body absorbing layer, the sheet member is made of a water repellent nonwoven fabric, and the portion located on the upper surface of the main body absorbing layer has water repellency and The above object is achieved by providing an absorbent article having an embossed portion which is formed in a concave shape by being pressed into the portion covering the sub absorbent layer together with the flap absorber layer and bonded to the flap absorber layer.

Embodiment of the Invention

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated based on the preferable embodiment.

The sanitary napkin 1 (hereinafter also referred to simply as the napkin 1) according to one embodiment of the present invention is a liquid permeable surface sheet 2 as a surface layer, and a liquid as a back layer as the surface layer. The liquid-retaining main body absorbent body 4 is provided as an impervious back sheet 3 and the main body absorbing layer interposed between these two layers, and is formed substantially longitudinally.

The napkin 1 has a front portion A disposed on the wearer's abdomen in order from the one end in the longitudinal direction to the other end, and an excretion opposed portion disposed opposite to the liquid excretion portion of the wearer ( B) and the rear part C arrange | positioned at the back side of a wearer.

As the surface sheet 2, those having liquid permeability, such as a nonwoven fabric and a porous film, are used. As the back sheet 3, those which prevent leakage such as a resin film, a resin film having fine pores, and a water-repellent nonwoven fabric are used. As the main body absorbent body, a liquid retaining material in which a superabsorbent polymer is incorporated into a fiber aggregate, a nonwoven fabric, a paper using pulp or hydrophilic fibers, or these are used.

The surface sheet 2 and the back sheet 3 which cover the main body absorbent body 4 and its both surfaces (skin facing surface and non-skin facing surface) are laminated | stacked as shown in FIG. The main body part 10 which extends over the longitudinal direction of the napkin 1 is formed in the width direction center part.

The napkin 1 extends from each of the two side edges 41 in the longitudinal direction of the main body absorber 4 to both side portions of the rear portion C, and is adhesively fixed on the inner surface (skin facing surface) of clothing such as panties when worn. The rear flap 5 to be provided is provided. In addition, since the napkin 1 is symmetrical, only the left half of FIG. 1 is shown in FIG.

As shown in FIG. 2, the back seat | sheet 3 in the back part C is extended more outward in the width direction than the side edge 41 of the longitudinal direction of the main body absorber 4, and the extension part 31 is shown in FIG. The non-skin-facing surface of this rear flap 5 is formed. On the non-skin-facing surface of the rear flap 5, the flap part adhesion layer 51 for fixing on inner surfaces (skin-facing surface), such as panties, is provided.

The flap part absorber 4S as a flap part absorption layer is arrange | positioned at the rear flap 5, The upper surface (skin opposing surface) of the said flap part absorber 4S places a part 6a on the upper surface of the main body absorber 4 The branches are covered by an extended portion (part extended to the rear flap) 6b of the sheet member 6.

As shown in FIG. 1, the sheet | seat material 6 is arrange | positioned in each of the both sides of the longitudinal direction of the napkin 1, and each sheet | seat material 6 extends in substantially parallel with the longitudinal direction of the napkin 1 It has 61 and the outer edge 62 which reaches the side edge of the napkin 1. Each sheet member 6 is joined to the backsheet 3 in the vicinity of the outer edge 62 by a known joining means (heat chamber, ultrasonic chamber, high frequency chamber, adhesive bonding with an adhesive, etc.), and the front and rear ends in the longitudinal direction. (63, 64) is bonded to the back sheet 3 or the surface sheet 2.

The sheet | seat material 6 consists of a water repellent nonwoven fabric, and has water repellency in the part located on the upper surface of the main body absorber 4 at least. Thereby, liquid movement beyond the sheet | seat material 6 hardly arises, and the liquid absorbed by the main body absorber 4 can be prevented from leaking out to the sheet | seat material 6 and leaking.

The expression that it is located on the upper surface of the main body absorbent body 4 (main body absorbing layer) is not limited to the case where the sheet | seat material 6 is in contact with or adjacent to the upper surface of the main body absorbent body 4 (main body absorbing layer), The napkin of this embodiment ( As in 1), another sheet such as the surface sheet 2 may be interposed between the sheet member 6 and the upper surface of the main body absorber 4. The upper surface of the main body absorbent body 4 (the flap part absorber 4S is also the same) is the surface (skin opposing surface) which faces the wearer's skin side at the time of wearing.

As shown in FIG. 2, the sheet | seat material 6 in the napkin 1 is a surface sheet in the part (for example, the part which separated 3-20 mm) separated from the inner edge 61 by predetermined width. It is bonded with (2), and can be separated from the surface sheet 2 between the junction part 65 and the inner edge 61 in the sheet | seat material 6. As shown in FIG. By providing the part which can be separated from the surface sheet 2 on the inner edge 61 side, the movement of the liquid beyond the sheet | seat 6 becomes less likely to occur.

In the napkin 1, the main body absorber 4 and each flap part absorber 4S are spaced apart in the width direction of the napkin 1, and the sheet | seat material 6 is the main body absorber 4 and each flap part absorber ( It is bonded to the back sheet 3 between 4S). In this way, leakage prevention property can be improved further by preventing the liquid absorbed by the main body absorber 4 from moving to the flap part absorber 4S between the sheet | seat material 6 and the back sheet 3. As shown in FIG. A well-known joining means (heat chamber, ultrasonic chamber, high frequency chamber, adhesion | attachment with an adhesive agent, etc.) can be used for joining the sheet | seat material 6 and the back sheet 3. It is preferable that the joining part 66 by this joining is over the whole part in which the flap part absorber 4S part in the longitudinal direction of the napkin 1 exists.

The sheet member 6 has an embossed portion 67 formed in a concave shape by being pressed together with the flap portion absorber 4S to the portion 6c covering the flap portion absorber 4S. The sheet member 6 is engaged with the flap portion absorber 4S in the emboss portion 67.

By having such an embossed part 67, although the water-repellent nonwoven fabric is used as the sheet | seat 6, the part 6c which covers the flap part absorber 4S of the said sheet | seat 6 expresses fluid permeability, The flap portion absorber 4S can absorb the liquid. The reason for expressing the liquid permeability by the embossing part 67 is an effect of the close contact between the flap absorber (4S; flap absorbing layer) and the water-repellent nonwoven fabric due to the compression of the embossing process, and the density of the absorbing layer is increased. It is thought that fluidity improves more in the peripheral part to the main surface part 67b of an embossing part by the increase of the capillary force. The fluid permeability is further improved by the pressure applied to the rear flap 5 during wearing.

According to this napkin 1, since the part which has water repellency of the sheet | seat material 6 covers the part from the upper surface of the main body absorber 4 to the side part, it is discharged | emitted above the main body part 10, or the main body absorber 4 Absorbed liquid can be prevented from moving on the rear flap 5, and on the rear flap 5 due to the liquid moved from the main body portion 10 to the rear flap 5, or a shift in the mounting position. The liquid removed can be absorbed and held by the flap absorber 4S from the skin facing surface side of the rear flap 5 due to the liquid permeability generated in the embossed portion 67. For this reason, the outstanding leak-proof performance is obtained, and the stickiness of the liquid absorbed by the rear flap 5 is reduced, and a feeling of fresh and comfortable wearing is obtained.

In addition, since the sheet member 6 is used as a state in which part thereof maintains water repellency and the other part expresses liquid permeability under pressure, the liquid does not flow or excrete on the rear flap 5. There is little soreness during installation in the inside, too, and user can stay comfortable.

Each rear flap 5 is formed with a plurality of embossed portions 67. As shown in FIG. 4, each embossed part 67 has large skin-facing surface side, and adheres to the flap part absorber 4S in the bottom part 67a and the main surface part 67b of a recessed part. have.

From the viewpoint of allowing the portion 6c covering the flap portion absorber 4S to express liquid permeability, the fibers constituting the sheet member 6 are filmed at the bottom portion 67a of the embossed portion 67. It is preferable that it is in the state which left the fluid gap (original fiber gap) even if it is in the state which left the fiber gap without the film gap or it is film-forming, and in the main surface part 67a of the emboss part 67, It is preferable that the fiber which comprises the sheet | seat material 6 is a state which left the said fiber gap or the liquid flow part. Furthermore, it is more preferable that the interfiber distance of the sheet | seat material 6 which comprises the main surface part 67b by the press of an embossing becomes wide. Moreover, also in the bottom part 67a, when the distance between fibers becomes large, it is more preferable that it is in such a state from the point which fluidity improves further.

When the part 6c which covers the flap part absorption layer 4S in the sheet | seat material 6 does not have the said embossed part by fluid presence (permeability with respect to a flap part absorber) by presence of the emboss part 67, As compared with the above, the liquid permeability under pressure is further improved.

Pressing here means the state which applied the pressing force assumed as the pressure applied to a rear flap while wearing a napkin. The small and large liquid permeability with or without an embossing part can be judged as follows, for example.

That is, when a liquid plate is provided on the rear flap 5 and the liquid is injected from the plate inlet in an inclined state, the liquid flows on the surface of the flap portion, does not flow, or flows when it flows. It can be judged according to the distance, and it can be said that the shorter the flow distance, the better the fluidity.

Moreover, it is preferable that the part 6c which covers the flap part absorber 4S of the sheet | seat material 6 expresses liquid permeability under no load.

The emboss part 67 in the napkin 1 of this embodiment is formed in multiple numbers discontinuously, and the shape of each emboss part is circular. The emboss part 67 in each rear flap 5 is arranged in plurality (five in the example), and the width | variety of napkin width in the width direction center part (this napkin 1 of this napkin 1) of the excretion part opposing part B A concave planar circular arc shape is formed toward the part where the main body absorber is located in the direction.

By arranging a group of embossed portions composed of a plurality of embossed portions (for example, 4 to 20) in this manner, the diffusion prevention property of the liquid in the rear flap 5 is improved, whereby The liquid permeability can also be improved. A valley portion shallower in depth than each embossed portion is formed between the individual embossed portions of the embossed portion group forming an arc shape, and the liquid diffusion prevention property and the fluid permeability during wearing are further improved. Further, by placing the embossed portion group in an arc shape, the flap has a smoothness, the fit with the user is improved, and the leakage preventing property is improved.

The same effect is exhibited also by arrange | positioning an embossed part of an elongate shape so that it may form the same concave circular arc shape independently.

As the sheet member 6, various known water repellent nonwoven fabrics can be used. However, the part disposed on the upper surface of the main body absorber 4 is used while being water repellent, while the embossed part 67 is formed in the part 6c covering the flap part absorber 4S, and at least the liquid-permeable property is worn. To be expressed.

By using the water repellent nonwoven fabric as the sheet material 6, it is easy to control such as partially varying the degree of water repellency and hydrophilicity by partial compression, fusion between fibers, and use of a hydrophilic emulsion described later. There is also an advantage.

As a water-repellent nonwoven fabric used as the sheet | seat material 6, a nonwoven fabric (SM) which combined the heat-roll nonwoven fabric, the spunbond nonwoven fabric, the melt-blown nonwoven fabric, the spunbond nonwoven fabric S, and the meltblown nonwoven fabric M , SMS, SMMS, etc.), breathable nonwoven fabric, spun-laced nonwoven fabric, and the like can be used.

Examples of the constituent fibers of the water repellent nonwoven fabric include polyolefin resins such as polyethylene, polypropylene, and propylene-ethylene random copolymers, polyester resins such as polyethylene terephthalate, vinyl resins such as polyvinyl chloride, and poly such as nylon. What consists of hydrophobic synthetic resins, such as an amide resin, can be used. In addition, a composite fiber composed of a combination of two kinds of resins (a sheath type composite fiber or a side by side type composite fiber) may be used. Moreover, the fiber which consists of various components can also be used individually by 1 type or in combination of 2 or more types.

The water-repellent nonwoven fabric used as the sheet member 6 exhibits water repellency on the main body absorbent body 4 and spun among the nonwoven fabrics of the various manufacturing methods described above in view of expressing good liquid permeability on the flap portion absorber 4S. It is preferable that it is a bond and SMS (SMMS) nonwoven fabric, and it is preferable that the constituent fiber is polyolefin, especially polypropylene.

The depth D (refer FIG. 3) of the embossing part 67 can be 1.0-5.0 mm, for example, Preferably it is 1.2-3.0 mm from the same viewpoint.

Moreover, it is preferable that the basis weight of a water repellent nonwoven fabric is 7-30 g / m <^2> from a same viewpoint, More preferably, it is 10-20 g / m <^2> .

As the flap absorber 4S, one that has conventionally been used as an absorber for absorbent articles such as sanitary napkins can be used. 10 ~ 100g / m ² is desirable, and preferably 10 ~ 50g / m ² more, more preferably 12 ~ 20g / m ^2.

As the material for forming the flap absorber 4S, a fiber assembly made of hydrophilic fibers (including those made from synthetic fibers) or a superabsorbent polymer therein can be used. Iii) Paper fabrics produced by fiber assembly, wet process, or pulp sheets produced by dry process are preferred. The fiber aggregate or the absorbent polymer contained therein may be coated with a tissue paper or a liquid permeable nonwoven fabric.

In order to impart fluidity to the portion 6c covering the flap portion absorber 4S, the bottom area of each embossed portion 67 is preferably 0.2 to 2.5 mm ² , particularly 0.5 to 1.2 mm ² , It is preferable that the total area of the embossed part 67 provided in the said part 6c of each rear flap 5 is 1 to 50%, especially 5 to 30% of the area of the said part 6c. The planar view shape of each embossing part 67 can be arbitrary shapes, such as ellipse, rectangle, triangle, star shape, and arc shape other than planar view circle. In addition, the arrangement | positioning of the embossing part 67 can be suitably determined, for example, as shown in FIG. 1, you may make an embossed area rate low by arranging in circular arc shape, and as shown in FIG. 4, the flap part absorber 4 is shown. It may be evenly distributed in the part covering the).

In the present napkin 1, the back sheet 3 also extends from both side edges 41 and 41 in the longitudinal direction of the main body absorbent body 4 also in the excreted portion opposing portion B. The sheet | seat material 6 is laminated | stacked, and the wing | blade part 7 is formed in the both sides of the excretion part opposing part B of the napkin 1. The wing | gum part 7 is apply | coated an adhesive on one side, and the wing | sticker part adhesion layer (not shown) is formed, When attaching a napkin, the said wing | gum part 7 is bent, and a wing | sticker part adhesive layer is made into panties, etc. To the outer surface of the mounting section provided on the inner surface of the clothing or panties. The napkin 1 is cut | disconnected by the narrow width | variety of the boundary part of the rear flap 5 and the wing part 7 in the longitudinal direction. As the material for forming the front sheet 2, the back sheet 3, and the main body absorbent body 4, various materials conventionally used for absorbent articles such as sanitary napkins can be used without particular limitation.

The napkin 1 mentioned above is laminated | stacked obtained by laminating | stacking the sheet | seat material 6 and the surface sheet 2, for example, and making a composite sheet, and laminating | stacking the composite sheet with the absorber 4 and the flap part absorber 4S. The composite sheet side is the embossing roll side between the embossing roll provided with the sieve in the main surface with the convex part for forming an embossing part, and the embossing apparatus provided with the backup roll arrange | positioned facing the said embossing roll. After inserting and forming an embossing part, it can obtain by laminating | stacking the back seat | sheet 3, the seal of a periphery part, and cutting to individual napkins.

The embossing device may be any one of thermal embossing, ultrasonic embossing, high frequency embossing, and embossing only for pressurization. It is preferable to add and emboss, and thermal embossing is preferable at the point which adhering to an absorber.

The absorbent article of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, the wing part 7 of the napkin 1 can also be made liquid retention as the structure similar to the rear flap 5.

The absorbent article of the present invention may not have the wing portion 7. Examples of the absorbent article of the present invention include a sanitary napkin, a panty liner (secretory sheet), an incontinence pad, a disposable diaper, and the like.

According to the absorbent article of the present invention, leakage of the liquid from the movement of the liquid onto the rear flap and the rear flap can be effectively prevented, and excellent leakage preventing property is obtained.

Claims (3)

An absorbent article having a front layer, a back layer, and a main body absorbing layer disposed between these two layers, each having a rear flap on each side of the longitudinal rear portion disposed on the back side of the wearer, The flap portion absorbing layer is disposed on the rear flap, The upper surface of the flap portion absorbing layer is covered by an extended portion of the sheet member having a portion on the upper surface of the body absorbing layer, The sheet member is selected from the group consisting of a water-repellent spunbond nonwoven fabric, a water-repellent melt-blown nonwoven fabric, and a water-repellent nonwoven fabric combining a spunbond nonwoven fabric and a meltblown nonwoven fabric, and is located on the upper surface of the main body absorbing layer. A portion having a water repellency and covering the flap portion absorbing layer, formed together with the flap portion absorbing layer and formed in a concave shape, and having a plurality of emboss portions combined with the flap portion absorbing layer,  Each of the embossed portions has a concave surface facing the skin, and the flap absorbing layer is in close contact with the bottom portion and the main surface portion of the concave portion. In the bottom portion and the main surface portion of the concave portion, the fibers constituting the sheet member are not filmed and have a fiber gap left. The body absorbent layer and the flap portion absorbent layers are spaced apart in the width direction of the absorbent article, Between the said main body absorption layer and the said flap part absorption layer, the said sheet | seat material is joined to the said back layer as a junction part, The said joining part is arrange | positioned over the whole part of the part in which the said flap part absorption layer exists in the longitudinal direction of the said absorbent article, and in the part in which the said flap part absorption layer exists, the part which has water repellency of the said sheet | seat material of the said main body absorbing layer An absorbent article covering a portion extending from a top surface to a side surface. The method of claim 1, A plurality of embossed portions are arranged so as to form a concave planar circular arc shape toward the center in the width direction of the deflecting portion opposing portion. delete

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