KR20060049891A - Absorbent article - Google Patents

Abstract

A rear flap (5) is provided on each of both sides of the longitudinal rear portion disposed on the back side of the wearer, having a front layer (2), a back layer (3) and a main body absorbing layer (4) disposed between these two layers. The branch is an absorbent article (1), and the flap portion absorbing layer (4S) is disposed on the rear flap (5), and the sheet member (6) having an upper surface of the flap portion absorbing layer (4S) having a part on the upper surface of the body absorbing layer (4). The sheet member 6 is covered by the water-repellent nonwoven fabric, and the portion positioned on the upper surface of the main body absorbent layer 4 has water repellency and covers the flap portion absorbent layer 4S. The part has an embossed 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

Absorbent article {ABSORBENT ARTICLE}

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 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 (mucus sheets), and incontinence pads.

2. Description of the Related Art It is conventionally 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. This rear flap prevents the occurrence of the so-called back glands, which are leaked while the liquid such as menstruation moves to the back side than the liquid excretion during 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 the leakage preventing side wall by the sheet material for forming the leakage preventing side wall, and at the same time, A sanitary napkin is described in which a rear flap is formed by extending the sheet material and the back sheet from both side edges of the absorber. It is described in this document 1 to arrange | position a sub absorber on a rear flap.

Further, Japanese Laid-Open Patent Publication No. 2003-290277 (hereinafter referred to as Document 2) describes a sanitary napkin in which a recess for liquid fixation 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 an absorbent core of a main body portion on a flap (wing portion) provided in the longitudinal center portion of the napkin. The sanitary napkin which arrange | positions another flap absorbent core and made it possible to absorb at the skin surface side surface of a flap is described.

However, in the sanitary napkin as described in Document 1, since the surface of the rear flap is formed by the sheet member for forming the leakage preventing side wall, the liquid absorbed by the main absorber forms the sheet member and back sheet for forming the leakage preventing side wall. Although it passes through and moves to the subabsorber of the rear flap, it is impossible to absorb and retain the liquid that has reached the rear flap over the leakage preventing side wall on 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 worsened. .

In addition, in the sanitary napkin described in Document 2, it is possible to reduce the diffusion of the liquid on the rear flap to some extent by the recess for liquid fixation, but since the liquid retaining absorbent layer is not disposed on the rear flap, If the movement is intense or worn for a long time, there is a risk of leakage.

Further, in the sanitary napkin described in Document 3, the entire area of the upper surface of the absorbent core of the main body portion is covered with the liquid-permeable surface sheet, and since the side upper surface of the absorbent core is not covered with the water-resistant material, liquid is formed along the surface sheet. It is easy to move and leaks easily.

Accordingly, it is an object of the present invention to provide an absorbent article which can effectively prevent the movement of liquid onto the rear flap and the liquid leak from the rear flap, and obtain excellent leakage resistance.

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, and a flap portion absorbing layer is disposed on the rear flap. And an upper surface of the flap portion absorbing layer is covered by an extension portion of the sheet member having a portion on the upper surface of the main body absorbing layer, wherein the sheet member is made of a water repellent nonwoven fabric, and a portion located on the upper surface of the main body absorbing layer has water repellency and at the same time a flap portion The above object is achieved by providing an absorbent article having an embossed portion formed in a concave shape by being pressed together with the flap absorbent layer on a portion covering the absorbent layer and bonded to the flap absorbent layer.

Embodiment of the Invention

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

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

The napkin 1 has a front part A disposed in order from the one end in the longitudinal direction toward the other end, the front part A disposed on the abdomen side of the wearer when worn, the discharge part opposing part B arranged opposite to the liquid excretion part of the wearer, and the wearer. It has the back part C arrange | positioned at the back side of the.

As the surface sheet 2, a liquid permeable one such as a nonwoven fabric or a porous film can be used. As the surface sheet 3, leakproof materials, such as a resin film, a resin film which has a micropore, and a water-repellent nonwoven fabric, are used. As the main body absorber, a fibrous assembly using pulp or hydrophilic fibers, a nonwoven fabric, paper, or a liquid retaining agent in which a superabsorbent polymer is incorporated therein can be used.

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

The napkin 1 extends from each of the both side portions 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 during wearing. The rear flap 5 to be provided is provided. In addition, since the napkin 1 is symmetrical, only half of the left side of FIG. 1 is shown in FIG.

As shown in FIG. 2, the back sheet 3 in the rear portion C extends outward in the width direction outward from the side edge 41 in the longitudinal direction of the main body absorber 4, and the extension portion 31 thereof. 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 absorber is arrange | positioned at the rear flap 5, and the upper surface (skin opposing surface) of the said flap part absorber 4S has a part 6a on the upper surface of the main body absorber 4; It is covered by the extended part (part extended to the rear flap) 6b of the sheet | seat material 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 is an inner edge extended substantially parallel to the longitudinal direction of the napkin 1; It has 61 and the outer edge 62 which leads to 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.), 63 and 64 are 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. As a result, liquid movement beyond the sheet member 6 hardly occurs, and the liquid absorbed by the main body absorber 4 can be prevented from leaking out of the sheet member 6.

The expression that it is located on the upper surface of the main body absorber 4 (body absorbing layer) is not limited to the case where the sheet member 6 is in contact with or adjacent to the upper surface of the main body absorber 4 (main body absorbing layer), and the napkin 1 of the present embodiment is used. ), Other sheets 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 portion absorber 4S is also the same) is the surface facing the wearer's skin side (skin facing surface) when worn.

As shown in FIG. 2, the sheet | seat material 6 in the napkin 1 is a surface sheet in the part spaced apart from the inner edge 61 by predetermined width (for example, the site | part separated from 3-20 mm). 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 a part that can be separated from the surface sheet 2 on the inner edge 61 side, the liquid movement beyond the sheet material 6 becomes less likely to occur.

In the napkin 1, the main body absorbent body 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 4S. ) Is bonded to the back sheet 3. Thus, leakage prevention property can be improved further by preventing the liquid absorbed by the main body absorber 4 from passing through between the sheet | seat material 6 and the back sheet 3, and moving to the flap part absorber 4S. A well-known joining means (heat chamber, ultrasonic chamber, high frequency chamber, adhesion | attachment by an adhesive agent, etc.) can be used for joining the sheet | seat material 6 and the back sheet 3. As shown in FIG. It is preferable that the joining part 66 by this joining covers the whole area | region of the 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 a 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, It is possible to absorb the liquid in the flap portion absorber 4S. The reason for expressing the liquid permeability by the embossing part 67 is an effect due to the close contact between the flap absorber (4S; flap absorbing layer) and the water repellent nonwoven fabric by the compression according to the embossing process, and as the density of the absorbing layer increases, It is thought that the fluid permeability improves more in the peripheral part to the main surface part 67b of an emboss part by the increase of a 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 over the main body part 10, or the main body absorber 4 Can be prevented from moving on the rear flap 5 and the liquid moved from the main body portion 10 to the rear flap 5, or on the rear flap 5 due to a shift in the mounting position or the like. The liquid discharged in the embossed portion 67 can be absorbed and retained by passing through the flap absorber 4S from the skin facing side of the rear flap 5. Therefore, it is excellent in leakage prevention performance and the stickiness of the liquid absorbed by the rear flap 5 is reduced, and a refreshing and comfortable feeling of attachment can be obtained.

In addition, since the sheet member 6 is used as a state in which a part of the water repellency is maintained, and the other part expresses liquid permeability under pressure, the sheet member 6 is mounted even in a situation in which no liquid flows or is excreted on the rear flap 5. There is no sore in the middle, and user can spend comfortably.

Each rear flap 5 is formed with a plurality of embossed portions 67. As shown in FIG. 4, each embossed portion 67 has a large skin opposing side, and is in close contact with the flap portion absorber 4S on the bottom portion 67a and the main surface 67b of the recessed portion.

In the bottom part 67a of the embossing part 67, the fiber which comprises the sheet | seat material 6 is not filmed from the viewpoint which the part 6c which covers the flap part absorber 4S expresses liquid permeability. It is preferable that a state is left in the state of leaving a gap between the fibers or a film leaving a liquid-permeable part (a gap between the original fibers) even if it is filmed. In the main surface portion 67a of the embossed portion 67, the sheet It is preferable that the fibers constituting the ash 6 have a state of leaving a gap or the liquid-permeable portion between the fibers. Furthermore, it is more preferable that the interfiber distance of the sheet | seat material 6 which comprises the main surface part 67b became wide by the press of embossing. 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.

The part 6c which covers the flap part absorption layer 4S in the sheet | seat material 6 is liquid-permeable (permeability with respect to a flap part absorber) by the presence of the embossing part 67, when there is no said embossing part. It is improving compared with the liquid, and the liquid permeability under pressurization is improving further.

The term "pressing" as used herein means a state in which a pressing force assumed to be applied to the rear flap is applied while the napkin is worn. The small and large liquid permeability with or without an embossing part can be judged as follows, for example.

That is, when the plate having the inlet is installed on the rear flap 5 and the liquid is injected from the plate inlet in the inclined state, when the liquid flows or is absorbed or does not flow on the surface of the flap part, it flows according to the flow distance. It can be judged, and it can be said that the shorter the flow distance, the better the liquid permeability.

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

The embossed 67 in the napkin 1 of this embodiment is formed in multiple numbers discontinuously, and the shape of each embossed part is circular. The emboss part 67 in each rear flap 5 is arranged in plurality (five in the example), and the width direction center part of the excretion part opposing part B (the napkin width direction in this napkin 1) In the concave planar arc shape.

By arrange | positioning the emboss part group which consists of several (for example, 4-20) emboss part in this way, the diffusion prevention property of the liquid in the rear flap 5 improves, and the fluid permeability in wearing Can also be improved. Between the respective embossed portions of the arc-shaped embossed portion group, valley portions shallower than those of the embossed portions are formed, and the liquid diffusion prevention property and the fluid permeability during wearing are further improved. In addition, since the embossed group is arranged 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 can be obtained by arrange | positioning an embossed part of an elongate shape so that it may form the same concave arc shape alone.

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 absorbent body 4 can be used while being water repellent, while the embossed portion 67 is formed in the part 6c covering the flap portion absorber 4S, and at least the tube is worn. Allow fluid to develop.

Using the water repellent nonwoven fabric as the sheet member 6 also has the advantage of easy control such as partial compression, fusion between fibers, and use of a hydrophilic emulsion described later to partially vary the degree of water repellency and hydrophilicity. .

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 spanbond nonwoven fabric, the melt-blown nonwoven fabric, the spanbond nonwoven fabric (S), and the meltblown nonwoven fabric (M) SMS, SMMS, etc.), a breathable nonwoven fabric, a spanlace nonwoven fabric, etc. can be used.

Examples of the constituent fibers of the water-repellent nonwoven fabric include polyolefin-based resins such as polyethylene, polypropylene, and propylene-ethylene random copolymers, polyester-based resins such as polyethylene terephthalate, vinyl-based resins such as polyvinyl chloride, and poly-based nylons. The thing comprised from hydrophobic synthetic resins, such as an amide resin, is mentioned. In addition, it is also possible to use a composite fiber made of a combination of two kinds of resins (a sheath type composite fiber and a side by side composite fiber). In addition, the fiber which consists of various components can 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, while being spunbonded among the nonwoven fabrics of the various manufacturing methods described above in terms of expressing good liquid permeability on the flap portion absorber 4S. It is preferable that it is SMS (SMMS) nonwoven fabric, and it is preferable that the constituent fiber is polyolefin, especially polypropylene.

From the same point of view, the depth D (see FIG. 3) of the embossed portion 67 can be, for example, 1.0 to 5.0 mm, and preferably 1.2 to 3.0 mm.

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, what has conventionally been used as an absorber of absorbent articles such as physiological stains or the like can be used. The basis weight of the flap absorber 4S from the viewpoint of causing the sheet member 6 to exhibit an appropriate degree of liquid permeability by embossing. It is preferable that it is 10-100 g / m <^2> , More preferably, it is 10-50 g / m <^2> , More preferably, it is 12-20 g / m <^2> .

As the material for forming the flap absorber 4S, a fiber aggregate made of hydrophilic fibers (including those obtained by hydrophilizing synthetic fibers), or a material having a superabsorbent polymer therein can be used. (I) Paper fabrics produced by the fiber assembly, the wet process, or pulp sheets produced by the 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 , and each rear portion. It is preferable that the total area of the embossed part 67 provided in the said part 6c of the flap 5 is 1 to 50%, especially 5 to 30% of the area of the said part 6c. The planar shape of each embossing part 67 can be arbitrary shapes, such as ellipse, rectangle, triangle, star shape, and arc shape other than planar circular shape. In addition, although the arrangement | positioning of the emboss part 67 can be suitably determined, for example, as shown in FIG. 1, an embossed area ratio may be made low by arrange | positioning in circular arc shape, and also as shown in FIG. 4, a flap part absorber ( 4) It may disperse | distribute in the part which covers.

In the present napkin 1, the back sheet 3 extends largely at both side edges 41 and 41 in the longitudinal direction of the powder absorbent body 4 also in the excreted portion opposing portion B, and the sheet member is also extended to the extended portion. (6) is laminated | stacked, and the blade | wing part 7 is formed in the both sides of the excretion part opposing part B of the napkin 1. The wing 7 is coated with an adhesive on one side thereof to form a wing adhesive layer (not shown). When the napkin is attached, the wing 7 is bent to the wing adhesive layer by panties or the like. The mounting part installed on the inner surface of clothing or panties is fixed to the outer surface side. The napkin 1 is clamped 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 absorber 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 this composite sheet with the absorber 4 and the flap part absorber 4S. The composite sheet side is embossed between both rolls of an embossing roll having a sieve having a convex portion for forming an embossing portion on a main surface thereof and a backing roll disposed opposite to the embossing roll. It can be obtained by inserting into the boss roll side, forming an embossed portion, and then laminating the back sheet 3, cutting the yarns around the periphery and individual napkins.

The embossing device may be any one of thermal embossing, ultrasonic embossing, high frequency embossing, and embossing only for pressurization. However, in order to form a concave shape, the embossing device is embossed by applying a pressure such that the strength decrease due to tearing of the sheet material does not occur. It is preferable to perform a boss process, and heat embossing is preferable at the point which sticks 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 by the same structure as 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 (mucus sheet), an incontinence pad, a disposable diaper, and the like.

According to the absorbent article of the present invention, it is possible to effectively prevent the movement of the liquid on the rear flap and the leakage of the liquid from the rear flap, and to obtain excellent leakage preventing property.

Claims (3)

It is an absorbent article which has a surface layer, a back layer, and the main body absorbing layer arrange | positioned between these both layers, and has a rear flap in each of the both side parts of the longitudinal rear part arrange | positioned at the back side of a 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 material 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 is formed in a concave shape by being pressed together with the flap absorbing layer to a portion covering the flap absorbing layer and combined with the flap absorbing layer. An absorbent article having a boss portion. 2. The absorbent article as set forth in claim 1, wherein one or more embossed portions form a concave planar circular arc toward the center portion in the width direction of the deflecting portion opposing portion. The absorbent article according to claim 1 or 2, wherein the sheet member is bonded to the back layer between the body absorbent layer and the flap portion absorbent layer.

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