JP2006034496A - Absorbent articles - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article capable of effectively preventing movement of liquid onto a rear flap and leakage of liquid from the rear flap, and obtaining excellent leakage resistance.
SOLUTION: It has a front surface layer 2, a back surface layer 3, and a main body absorption layer 4 disposed between both layers, and has rear flaps 5 on both sides of the longitudinal rear portion arranged near the wearer's back. In the absorbent article, the flap portion absorbent layer 4S is arranged on the rear flap 5, and the upper surface of the flap portion absorbent layer 4S extends from the sheet material 6 having a part on the upper surface of the main body absorbent layer 4. Covered by the protruding portion 6b, the sheet material 6 is made of a water repellent nonwoven fabric, the portion located on the upper surface of the main body absorbent layer 4 has water repellency, and the portion covering the flap portion absorbent layer 4S is flapped. It has the embossed part 67 which was compressed with the part absorption layer 4S, was formed in the concave shape, and couple | bonded with the flap part absorption layer 4S.
[Selection] Figure 2

Description

  The present invention relates to an absorbent article such as a sanitary napkin, a panty liner (cage sheet), and an incontinence pad.

  Conventionally, as a sanitary napkin, at the time of wearing, a rear flap disposed on the inner surface (skin facing surface) of clothing such as shorts is provided on each side of the longitudinal rear portion disposed near the back of the wearer. Things are known. Such a rear flap prevents the occurrence of so-called back leakage in which liquid such as menstrual blood leaks by moving to the back side from the liquid excretion part during wearing. It is also known to form a leak-proof barrier by disposing a water-resistant sheet material on both the left and right sides of a sanitary napkin having such a rear flap.

For example, in Patent Document 1, a leak-proof side wall is formed by a sheet material for forming a leak-proof side wall, and the sheet material and the back sheet are extended from both side edges of the main absorbent body in the rear part to form a rear flap. A formed sanitary napkin is described. The document 1 describes that a secondary absorber is disposed on the rear flap.
Patent Document 2 describes a sanitary napkin in which a recess for liquid stop is formed on at least the skin side surface of the rear flap.
Furthermore, in Patent Document 3, although not the rear flap, a flap absorbent core different from the absorbent core of the main body portion is arranged on the flap (wing portion) provided in the longitudinal center portion of the napkin, A sanitary napkin that can absorb liquid from the skin side surface is described.

JP 2002-219144 A JP 2003-290277 A Japanese Utility Model Publication No. 7-3622

However, in the sanitary napkin described in Patent Document 1, since the surface of the rear flap is formed by the sheet material for leakproof side wall formation, the liquid absorbed by the main absorbent is the sheet material for leakproof side wall formation. The liquid that has passed over the leak-proof side wall and has reached the rear flap may be absorbed and retained by the rear flap or the sub-absorber. I can't. In the same document 1, it is described that an apertured nonwoven fabric or a hydrophilic nonwoven fabric can be used as a sheet material for forming a leak-proof side wall. It will be significantly impaired.
Further, in the sanitary napkin described in Patent Document 2, the diffusion of the liquid on the rear flap can be reduced to some extent by the recess for stopping liquid, but since the liquid retaining absorbent layer is not arranged on the rear flap. There is a risk of leakage when the wearer moves vigorously or wears for a long time.
In the sanitary napkin described in Patent Document 3, the entire upper surface of the absorbent core of the main body is covered with a liquid-permeable surface sheet, and the upper side surface of the absorbent core is also covered with a water-resistant material. Therefore, the liquid easily moves along the surface sheet, and easily leaks.

  Accordingly, an object of the present invention is to provide an absorbent article that can effectively prevent the movement of the liquid onto the rear flap and the leakage of the liquid from the rear flap, and obtain an excellent leak-proof property. is there.

  The present invention is an absorbent article having a front surface layer, a back surface layer, and a main body absorbent layer disposed between both layers, and having rear flaps on both sides of the longitudinal rear portion disposed near the back of the wearer. In the rear flap, a flap portion absorbent layer is disposed, and the upper surface of the flap portion absorbent layer is covered with an extended portion of the sheet material having a part on the upper surface of the main body absorbent layer, The sheet material is made of a water-repellent nonwoven fabric, and the portion located on the upper surface of the main body absorbent layer has water repellency, and the portion covering the flap portion absorbent layer is pressed together with the flap portion absorbent layer to form a concave shape. The above object is achieved by providing an absorbent article having an embossed portion combined with a flap portion absorbing layer.

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

Hereinafter, the present invention will be described based on preferred embodiments thereof.
A sanitary napkin 1 (hereinafter also simply referred to as a napkin 1) according to an embodiment of the present invention includes a liquid-permeable surface sheet 2 as a surface layer and a liquid-impermeable as a back layer, as shown in FIGS. The liquid-retaining main body absorbent body 4 is provided as a main body absorbent layer interposed between the conductive back sheet 3 and the two layers, and is substantially vertically long.
The napkin 1 is arranged in order from one end portion in the longitudinal direction toward the other end portion, a front portion A that is arranged closer to the wearer's ventral side when worn, and an excretion portion facing portion that is disposed to face the wearer's liquid drainage portion. B and rear part C arranged near the wearer's back.

  As the surface sheet 2, a liquid permeable material such as a nonwoven fabric or an apertured film is used. As the back sheet 3, a leak-proof material such as a resin film, a resin film having fine pores, or a water-repellent nonwoven fabric is used. As the main body absorbent, a fiber assembly using a pulp or a hydrophilic fiber, a non-woven fabric, paper, or a liquid-retaining one in which a superabsorbent polymer is blended with these.

The top sheet 2 and the back sheet 3 covering the main body absorbent body 4 and both surfaces thereof (skin facing surface and non-skin facing surface) are laminated as shown in FIG. 2, and the napkin 1 is arranged at the center in the width direction of the napkin 1. The main-body part 10 extended over the longitudinal direction is formed.
The napkin 1 extends from both side edges 41 in the longitudinal direction of the main body absorbent body 4 on both side portions of the rear portion C, and is adhered and fixed to the inner surface (skin facing surface) of clothing such as shorts when worn. It has. Since the napkin 1 is symmetrical, only the left half of FIG. 1 is shown in FIG.

As shown in FIG. 2, the back sheet 3 in the rear part C extends greatly outward in the width direction from the side edge 41 in the longitudinal direction of the main body absorbent body 4, and the extension part 31 of the rear flap 5 A non-skin facing surface is formed. The non-skin facing surface of the rear flap 5 is provided with a flap adhesive layer 51 for fixing on an inner surface (skin facing surface) such as shorts.
The rear flap 5 is provided with a flap absorber 4S as a flap absorber layer. The upper surface (skin-facing surface) of the flap absorber 4S has a part 6a on the upper surface of the main body absorber 4. It is covered with the extended part (part extended to the rear flap) 6b of the sheet | seat material 6 to have.

  As shown in FIG. 1, the sheet material 6 is disposed on each side of the napkin 1 in the longitudinal direction. Each sheet material 6 includes an inner edge 61 extending substantially parallel to the longitudinal direction of the napkin 1, and the napkin 1. And an outer edge 62 reaching the side edge. Each sheet material 6 is joined to the back sheet 3 in the vicinity of the outer edge 62 by a known joining means (heat seal, ultrasonic seal, high frequency seal, adhesive bonding, etc.), and longitudinal front and rear end portions 63 and 64 are joined. Is bonded to the back sheet 3 or the top sheet 2.

The sheet material 6 is made of a water-repellent nonwoven fabric, and has water repellency at least in a portion located on the upper surface of the main body absorbent body 4. Thereby, the movement of the liquid over the sheet material 6 hardly occurs, and it is possible to prevent the liquid absorbed by the main body absorber 4 from leaking out into the sheet material 6 and leaking.
The expression “located on the upper surface of the main body absorber 4 (main body absorption layer)” is not limited to the case where the sheet material 6 is in contact with or adjacent to the upper surface of the main body absorber 4 (main body absorption layer). Other sheets such as the top sheet 2 may be interposed between the sheet material 6 and the upper surface of the main body absorbent body 4 as in the form of the napkin 1. The upper surface of the main body absorber 4 (the same applies to the flap absorber 4S) is a surface (skin facing surface) directed toward the wearer's skin when worn.

  As shown in FIG. 2, the sheet material 6 in the napkin 1 is bonded to the surface sheet 2 at a portion spaced apart from the inner edge 61 by a predetermined width (for example, a portion separated by 3 to 20 mm). The joint 65 and the inner edge 61 can be separated from the topsheet 2. By providing a portion that can be separated from the surface sheet 2 on the inner edge 61 side, movement of the liquid over the sheet material 6 is further less likely to occur.

  In the napkin 1, the main body absorber 4 and each flap part absorber 4S are separated in the width direction of the napkin 1, and the sheet material 6 is between the main body absorber 4 and each flap part absorber 4S. Bonded to the back sheet 3. In this way, the liquid absorbed in the main body absorber 4 does not move between the sheet material 6 and the back sheet 3 and moves to the flap portion absorber 4S, thereby further improving the leakage prevention property. be able to. For joining the sheet material 6 and the back sheet 3, known joining means (heat sealing, ultrasonic sealing, high frequency sealing, adhesion with an adhesive, etc.) can be used. It is preferable that the joining part 66 by this joining covers the whole area of the part where the flap part absorber 4S part exists in the longitudinal direction of the napkin 1.

The sheet material 6 has an embossed portion 67 that is squeezed together with the flap portion absorbent body 4S and formed in a concave shape in a portion 6c that covers the flap portion absorbent body 4S. The sheet material 6 is coupled to the flap portion absorber 4S at the embossed portion 67.
By having such an embossed portion 67, the portion 6c of the sheet material 6 covering the flap portion absorbent body 4S exhibits liquid permeability even though a water-repellent nonwoven fabric is used as the sheet material 6. The liquid can be absorbed by the partial absorber 4S. The reason why the embossed part 67 exhibits liquid permeability is the effect that the flap part absorbent body 4S (flap part absorbent layer) and the water-repellent nonwoven fabric come into close contact with each other by the embossing process, and the density of the absorbent layer is high. It is considered that the liquid permeability is further improved in the peripheral edge portion or the peripheral surface portion 67b of the embossed portion due to the increase in capillary force. The liquid permeability is further improved by the pressure applied to the rear flap 5 during wearing.

According to the present napkin 1, the water repellent part of the sheet material 6 covers the part from the upper surface to the side part of the main body absorbent body 4, so that it is discharged onto the main body part 10 or the main body absorbent body 4 is The absorbed liquid can be prevented from moving onto the rear flap 5, and the liquid moved from the main body portion 10 to the rear flap 5 or the liquid excreted on the rear flap 5 due to the displacement of the mounting position is embossed. The liquid permeability generated in the portion 67 allows the liquid to be passed through the flap portion absorbent body 4S from the skin facing surface side of the rear flap 5 to be absorbed and held. As a result, excellent leakage prevention performance can be obtained, and the stickiness of the liquid absorbed by the rear flap 5 is reduced, and a light and comfortable wearing feeling can be obtained.
Further, since the sheet material 6 is used in a state where a part thereof maintains water repellency and the other part exhibits liquid permeability under pressure, the liquid flows on the rear flat 5, or The user can spend comfortably with less feeling of stuffiness during wearing even when the patient is not excreted.

Each rear flap 5 is provided with a plurality of embossed portions 67. As shown in FIG. 4, each embossed portion 67 is largely recessed on the skin facing surface side, and is in close contact with the flap portion absorbent body 4 </ b> S at the bottom portion 67 a and the peripheral surface portion 67 b of the recessed portion.
From the viewpoint of allowing the portion 6c covering the flap portion absorbent body 4S to exhibit liquid permeability, at the bottom portion 67a of the embossed portion 67, the fibers constituting the sheet material 6 are not formed into a film and have a fiber gap. It is preferable that the remaining portion or the liquid passage portion (original fiber gap) is left even if the film is formed, and the peripheral surface portion 67a of the embossed portion 67 constitutes the sheet material 6. It is preferable that the fiber is in a state in which the above-mentioned fiber gap or liquid passing portion is left. Furthermore, it is more preferable that the inter-fiber distance of the sheet material 6 constituting the peripheral surface portion 67b is widened by pressing the emboss. In addition, since the liquid permeability is further improved when the fiber sensing distance is widened at the bottom 67a, it is more preferable to be in such a state.

In the sheet material 6, the portion 6 c that covers the flap portion absorption layer 4 </ b> S is improved in liquid permeability (liquid permeability with respect to the flap portion absorber) due to the presence of the embossed portion 67 as compared with the case without the embossed portion. The liquid permeability under pressure is further improved. The term “under pressure” as used herein means a state in which an applied pressure is applied as a pressure applied to the rear flap while the napkin is worn. The liquid permeability depending on the presence or absence of the embossed portion can be determined, for example, as follows.
That is, when a plate provided with an injection port is placed on the rear flap 5 and liquid is injected from the plate injection port in an inclined state, the liquid flows on the surface of the flap portion, does not flow through absorption, or flows. In this case, it can be determined by the flowing distance, and it can be said that the shorter the flowing distance, the better the liquid permeability.
In addition, 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.

A plurality of the embossed portions 67 in the napkin 1 of the present embodiment are formed discontinuously, and the shape of each embossed portion is circular. A plurality (5 in the illustrated example) of the embossed portions 67 in each rear flap 5 are arranged in the center in the width direction of the excretory portion facing portion B (in the napkin 1, the main body absorbent body is positioned in the napkin width direction). A concave portion in a plan view is formed toward the portion).
By disposing an embossed portion group composed of a plurality of (for example, 4 to 20) embossed portions in this way, the liquid diffusion preventing property in the rear flap 5 is improved, thereby improving the liquid permeability during wearing. Can be made. Between each embossed part of the arc-shaped embossed part group, a shallower valley part is formed than each embossed part, and the liquid diffusion prevention property and the liquid permeability during wearing are further improved. Yes. In addition, since the embossed portion group is arranged in an arc shape, the flap has bendability, the fit with the user is improved, and the leak-proof property is improved.
The same effect can be obtained by arranging the elongated embossed portions independently so as to form a similar concave arc shape.

Various known water-repellent nonwoven fabrics can be used as the sheet material 6. However, the portion disposed on the upper surface of the main body absorbent body 4 is used while remaining water-repellent, while the embossed portion 67 is formed on the portion 6c covering the flap portion absorbent body 4S, at least during wearing. The liquid permeability is expressed.
By using a water-repellent nonwoven fabric as the sheet material 6, control such as partially varying the degree of water repellency and hydrophilicity by partial compression, fusion between fibers, combined use of a hydrophilizing oil described later, etc. There is also an advantage that is easy.

  Examples of the water-repellent nonwoven fabric used as the sheet material 6 include heat roll nonwoven fabric, spunbond nonwoven fabric, meltblown nonwoven fabric, nonwoven fabric combining spunbond nonwoven fabric (S) and meltblown nonwoven fabric (M), and air-through nonwoven fabric. A spunlace nonwoven fabric can be used.

  The constituent fibers of the water-repellent nonwoven fabric include, for example, polyolefin resins such as polyethylene, polypropylene, and propylene-ethylene random copolymers, polyester resins such as polyethylene terephthalate, vinyl resins such as polyvinyl chloride, and polyamides such as nylon. What is comprised from hydrophobic synthetic resins, such as resin, can be used. Also, a composite fiber (core-sheath type composite fiber or side-by-side type composite fiber) made of a combination of two kinds of resins can 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.

  While the water-repellent nonwoven fabric used as the sheet material 6 exhibits water repellency on the main body absorbent body 4, from the viewpoint of expressing good liquid permeability on the flap portion absorbent body 4S, among the nonwoven fabrics of the various production methods described above, Spunbond and SMS (SMMS) nonwoven fabrics are preferred, and the constituent fibers thereof are preferably polyolefins, especially polypropylene.

From the same viewpoint, the depth D (see FIG. 3) of the embossed portion 67 can be set to, for example, 1.0 to 5.0 mm, and preferably 1.2 to 3.0 mm.
From the same viewpoint, the water-repellent nonwoven fabric preferably has a basis weight of 7 to 30 g / m ² , more preferably 10 to 20 g / m ² .

As the flap portion absorbent body 4S, those conventionally used as absorbent bodies for absorbent articles such as sanitary napkins can be used, but the sheet material 6 seems to exhibit appropriate liquid permeability by embossing. from the viewpoint of, preferably it has a basis weight of 10 to 100 g / m ^2, more preferably from 10 to 50 g / m ^2, more preferably from 12~20g / m ^2.
As a forming material of the flap portion absorbent body 4S, a fiber aggregate made of hydrophilic fibers (including those obtained by hydrophilizing synthetic fibers), or a material in which a superabsorbent polymer is held can be used. Specifically, a fiber assembly in which pulp is piled, paper made by a wet process, and a pulp sheet made by a dry process are preferable. The fiber aggregate and the one in which the water-absorbing polymer is held may be coated with a tissue paper or a liquid-permeable nonwoven fabric.

In order to impart liquid permeability to the portion 6c covering the flap portion absorbent body 4S, the bottom area of each embossed portion 67 is 0.2 to ^2.5 mm ² , particularly 0.5 to 1.2 mm ^2. Preferably, the total area of the embossed portion 67 provided on the portion 6c of each rear flap 5 is preferably 1 to 50%, particularly 5 to 30% of the area of the portion 6c. The planar view shape of each embossed portion 67 can be an arbitrary shape such as an elliptical shape, a rectangular shape, a triangular shape, a star shape, or an arc shape in addition to a circular shape in a planar view. Further, the arrangement of the embossed portion 67 can be determined as appropriate. For example, as shown in FIG. 1, the embossed portion 67 may be arranged in an arc shape to lower the embossed area ratio, and as shown in FIG. It may be evenly dispersed in the portion covering the partial absorber 4.

  In the napkin 1, the back sheet 3 extends greatly from both side edges 41, 41 in the longitudinal direction of the main body absorbent body 4 in the excretory part facing part B, and the sheet material 6 is laminated on the extended part. Thus, the wing portions 7 are formed on both side portions of the excretion portion facing portion B of the napkin 1. The wing part 7 has an adhesive applied on one side to form a wing part adhesive layer (not shown). When the napkin is attached, the wing part 7 is bent and the wing part adhesive layer is It fixes to the outer surface side of clothes, such as shorts, or the mounting part provided in the shorts inner surface. In the napkin 1, the vicinity of the boundary between the rear flap 5 and the wing 7 is narrowed in the longitudinal direction. As materials for forming the top 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 described above is obtained by, for example, joining the sheet material 6 and the surface sheet 2 to form a composite sheet, and laminating the composite sheet with the absorbent body 4 and the flap part absorbent body 4S. The embossed portion is inserted between both rolls of an embossing roll having an embossing roll having a convex portion for forming on the peripheral surface and a backup roll arranged opposite to the embossing roll with the composite sheet side as the embossing roll side. Then, it is obtained by laminating the back sheet 3, sealing the peripheral edge, and cutting into individual napkins.
The embossing device may be any of hot embossing, ultrasonic embossing, high-frequency embossing, embossing only with pressurization, etc., but from the point of forming a concave shape, apply pressure that does not cause strength reduction due to breakage of the sheet material It is preferable to perform embossing, and heat embossing is preferable from the viewpoint of being in close contact with the absorber.

The absorbent article of the present invention is not limited to the above embodiment, and can be variously modified without departing from the spirit of the present invention.
For example, the wing portion 7 of the napkin 1 can also be liquid retaining as a configuration similar to the rear flap 5.

  The absorbent article of the present invention may not have the wing part 7. Examples of the absorbent article of the present invention include sanitary napkins, panty liners (orimono sheets), incontinence pads, disposable diapers and the like.

FIG. 1 is a plan view showing a sanitary napkin as an embodiment of the present invention. 2 is a cross-sectional view taken along the line II of FIG. FIG. 3 is a partially enlarged view of FIG. 2 showing the embossed portion and its vicinity. FIG. 4 is a partial plan view showing a rear flap portion of a sanitary napkin according to another embodiment of the present invention.

Explanation of symbols

1 Sanitary napkin (absorbent article)
2 Top sheet (surface layer)
3 Back sheet (back layer)
4 Main body absorber (Main body absorption layer)
4S Flap Absorber (Flap Absorber Layer)
5 Rear flap 6 Sheet material made of water-repellent nonwoven fabric 6a Part located on the upper surface of the main body absorber 6b Part extended to the rear flap 6c Part covering the flap part absorber 7 Wing part 8 Flap part adhesive layer A Front part B Excretion part opposite part C rear part

Claims (3)

The absorbent article has a front layer, a back layer, and a main body absorbent layer disposed between both layers, and has rear flaps on both sides of the longitudinal rear portion arranged near the back of the wearer,
A flap part absorption layer is arranged on the rear flap,
The upper surface of the flap portion absorbent layer is covered with an extending portion of the sheet material having a part on the upper surface of the main body absorbent layer,
The sheet material is made of a water-repellent nonwoven fabric, and the portion located on the upper surface of the main body absorbent layer has water repellency, and is pressed into the portion covering the flap portion absorbent layer together with the flap portion absorbent layer to form a concave shape. An absorbent article having an embossed portion combined with the flap portion absorbing layer.   2. The absorbent article according to claim 1, wherein one of the embossed parts is singly or a plurality of the embossed parts are arranged in a circular arc shape in a concave shape toward a substantially central part in the width direction of the excretory part facing part. The absorptive article according to claim 1 or 2 by which said sheet material is joined to said back layer between said main part absorption layer and said flap part absorption layer.

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