JP5132798B2 - Absorbent articles - Google Patents

Description

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

An absorbent article such as a sanitary napkin has an absorbent main body having an absorbent layer and a leak-proof layer, and a pair of rear flaps extending outward in the width direction from both sides of the absorbent main body. There is. The rear flap is used by being attached to the underwear such as shorts without being folded in the state of extending from the absorbent main body, and is different from the wing used by being folded to the outer surface side of the crotch portion of the underwear. It is.
Further, in the sanitary napkin having the rear flap, an absorbent layer (hereinafter referred to as “flap absorption layer”) is provided on the rear flap so that the body fluid overflowing from the absorbent main body can be absorbed by the rear flap. A technique for improving the leak-proof property is known (for example, see Patent Document 1 below).

JP 2000-189459 A

  In a sanitary napkin having a rear flap with a flap absorbent layer, the flap absorbent layer is thin, the flap absorbent layer has high liquid retention, and the liquid returns in the flap absorbent layer (the liquid once absorbed leaks out). It is hoped that there is little. However, in the sanitary napkin described in Patent Document 1, sufficient consideration is not given to improving these points, and further improvements are desired for these points.

  Accordingly, an object of the present invention is to reduce the thickness of the flap absorbent layer, increase the liquid retention of the flap absorbent layer, and improve the liquid return in the flap absorbent layer in the absorbent article having the rear flap provided with the flap absorbent layer. An object of the present invention is to provide an absorbent article that can be reduced.

  The present invention includes a substantially vertically long absorbent main body provided with a main body absorbent layer and a main body leak-proof layer, and a pair of rear flaps extending outward in the width direction from at least both sides of the rear part of the absorbent main body. The back flap includes a flap topsheet, a flap backsheet, and a flap absorber interposed therebetween, and the flap absorber has an absorbent polymer in the fiber assembly. The above-mentioned object is achieved by providing an absorbent article comprising a polymer sheet in which is added, and the upper surface side of the flap absorbent body functions as a temporary liquid retaining layer.

  Further, the present invention is a pair of a substantially vertically long absorbent main body provided with a main body absorbent layer and a main body leak-proof layer, and a pair extending outward in the width direction from each of both sides of at least the rear part of the absorbent main body. An absorptive article having a back flap, wherein the back flap includes a flap surface sheet, a flap back sheet, and a flap absorber interposed therebetween, and the flap surface sheet is attached to the flap absorber. Absorbent article having a large number of projecting apertures projecting toward each other, and the region where the projecting apertures are not provided in the flap surface sheet and the flap absorber are separated by the projecting apertures By providing the above, the above object is achieved.

  According to the present invention, in an absorbent article having a rear flap with a flap absorbent layer, the thickness of the flap absorbent layer is reduced, the liquid retention of the flap absorbent layer is increased, and the liquid return in the flap absorbent layer is reduced. be able to.

FIG. 1 is a perspective view showing a sanitary napkin as a first embodiment of the absorbent article of the present invention. 2 is a cross-sectional view taken along the line II-II shown in FIG. 3 is a cross-sectional view taken along the line III-III shown in FIG. 4A is a cross-sectional view of the rear flap, and FIG. 4B is a partially enlarged view of FIG. FIG. 5 is a perspective view showing a flap surface sheet. FIG. 6 is a cross-sectional view (corresponding to FIG. 4A) showing a rear flap in the second embodiment of the absorbent article of the present invention. FIG. 7 is a cross-sectional view (corresponding to FIG. 4A) showing a rear flap in the third embodiment of the absorbent article of the present invention. FIG. 8 is a cross-sectional view (corresponding to FIG. 4A) showing a rear flap in the fourth embodiment of the absorbent article of the present invention. FIG. 9 is a cross-sectional view (corresponding to FIG. 2) showing a first modification of the absorbent article of the present invention. FIG. 10 is a cross-sectional view (corresponding to FIG. 2) showing a second modification of the absorbent article of the present invention.

Hereinafter, the absorbent article of the present invention will be described based on a preferred embodiment (first embodiment) with reference to the drawings.
The absorbent article of the present embodiment is a sanitary napkin 1, and as shown in FIGS. 1 to 3, a substantially vertically long absorbent having a main body absorbent layer (21, 23) and a main body leak-proof layer 22. The body 2, a pair of rear flaps 3, 3 extending outward in the width direction from at least both sides of the rear part B in the absorbent body 2, and the width direction from both sides of the front part A in the absorbent body 2 It has a pair of wing parts 4 and 4 extended outward.

  In the absorbent main body 2, the “front portion A” means a portion located on the front side of the wearer during use, and specifically, located on the front side of the longitudinal central portion of the absorbent main body 2. Part. In addition, the “rear part B” means a part located on the rear side of the wearer during use, and specifically, a part located on the rear side of the central part in the longitudinal direction of the absorbent main body 2. . “At least the rear part B” means that a part of the rear flap 3 extends from the front part A.

  Unless otherwise specified, the “longitudinal direction” is a direction along the longitudinal direction of the absorbent article (absorbent body 2), and the “width direction” is the direction of the absorbent article (absorbent body 2). It is a direction along the width direction. The “upper surface” and the “lower surface” are the upper surface and the lower surface in the developed state, respectively.

  As shown in FIG. 2, the absorbent main body 2 includes a main body absorption layer (21, 23) and a main body leakage prevention layer 22. The main body absorption layer (21, 23) includes a liquid-permeable main body surface sheet 21 and a liquid-retaining main body absorber 23. The main body absorber 23 has a substantially rectangular shape in plan view. The main body absorber 23 is composed of a laminate of an upper layer main body absorber 23a and a lower layer main body absorber 23b. The main body surface sheet 21 covers the entire upper surface of the main body absorber 23.

The main body leak-proof layer 22 consists of a liquid-impermeable or water-repellent main body back sheet. The main body back surface sheet 22 covers the entire lower surface of the main body absorber 23.
As shown in FIG. 1, a pressing groove D that is recessed from the main body surface sheet 21 toward the main body absorber 23 is provided on the upper surface of the absorbent main body 2. The compressed groove D is formed by, for example, heat embossing, and integrates the main body surface sheet 21 and the main body absorber 23.
Thus, the absorptive main body 2 is composed of a laminate in which the main body topsheet 21, the main body absorber 23, and the main body backsheet 22 are stacked in this order.

As shown in FIG. 1, the rear flap 3 is used by being attached to an underwear such as shorts without being folded back in a state of extending from the absorbent main body 2. However, the rear flap 3 may be folded back to the upper surface side or the lower surface side of the absorbent main body 2 in order to make it compact in a packaged form of a sanitary napkin or the like.
The length of the sanitary napkin 1 having the rear flap 3 (the length along the longitudinal direction of the sanitary napkin) is 26 cm or more, preferably 30 cm or more. The width (one side) of the rear flap 3 (the width along the width direction of the sanitary napkin) is 1 cm or more, preferably 3 cm or more. The width of the rear flap 3 is preferably shorter than the width of the absorbent main body 2 from the viewpoint of ease of handling when taking out the sanitary napkin from the individual packaging form and ease of wearing the sanitary napkin. The rear flap 3 in the present embodiment is disposed in the rear part B and has a shape whose width increases from the front part A toward the rear part B.

As shown in FIG. 2, the rear flap 3 includes a flap absorbing layer (31, 33) and a flap leakage preventing layer 32. The flap absorbing layer (31, 33) is composed of a liquid permeable flap surface sheet 31 and a liquid retaining flap absorbent 33. The flap absorber 33 has a shape that is smaller than the rear flap 3 in plan view. The flap surface sheet 31 covers the entire upper surface of the flap absorber 33.
The flap leak-proof layer 32 is made of a liquid-impermeable or water-repellent flap back sheet. The flap back sheet 32 covers the entire lower surface of the flap absorber 33.
Thus, the back flap 3 consists of a laminated body in which the flap topsheet 31, the flap absorber 33, and the flap backsheet 32 are laminated in this order.

The wing part 4 is used by being folded back to the outer surface side of the crotch part of the underwear, and has the same configuration as the rear flap 3 except for its position, plan view shape and the like. As shown in FIG. 1, the wing portion 4 in the present embodiment has a substantially trapezoidal shape in which a lower base (side longer than the upper base) is positioned on the side of the absorbent main body 2.
Specifically, as shown in FIG. 3, the wing part 4 includes a liquid-permeable wing surface sheet 41, a liquid-holding wing absorber 43, and a liquid-impermeable or water-repellent wing back sheet 42 in this order. It consists of the laminated body laminated | stacked. The wing absorber 43 has a shape in which the wing portion 4 is slightly reduced in plan view. The wing surface sheet 41 covers the entire upper surface of the wing absorber 43. The wing back sheet 42 covers the entire lower surface of the wing absorber 43.
Thus, the wing part 4 consists of a laminated body in which the wing topsheet 41, the wing absorber 43, and the wing backsheet 42 are laminated in this order.

Although each said member which comprises the absorptive main body 2, the back flap 3, and the wing part 4 can also be comprised separately, respectively, a some member can also be comprised integrally.
In the present embodiment, as shown in FIGS. 2 and 3, the main body surface sheet 21, the pair of flap surface sheets 31, 31 and the pair of wing surface sheets 41, 41 are formed from one integrated surface sheet 11. Yes. The main body back sheet 22, the pair of flap back sheets 32, 32 and the pair of wing back sheets 42, 42 are formed from one integrated back sheet 12.

  Further, the lower layer main body absorber 23b, the pair of flap absorbers 33, 33, and the pair of wing absorbers 43, 43 are formed from one integrated absorber 13 and integrated (direct integration). The integral absorbent body 13 can also be formed by partially overlapping the separate lower layer main body absorbent body 23b, the flap absorbent body 33, and the wing absorbent body 43 (indirect integration).

From another viewpoint, the flap absorber 33 and the wing absorber 43 extend over the absorbent main body 2 and are integrated directly or indirectly with a part of the main body absorber 23 (lower layer main body absorber 23b). It has become.
The reason why it is preferable that the flap absorbent body 33 extends over the absorbent main body 2 and is integrated with a part of the main body absorbent body 23 is as follows. In the flap absorber 33, the body fluid is often absorbed in the region near the absorbent main body 2 in the flap absorber 33 indirectly or directly through the main body absorber 23. Even in such a case, due to the presence of the main body absorber 23 integrated with the flap absorber 33, the body fluid absorbed in the region near the absorbent main body 2 in the flap absorber 33 gradually increases concentrically from the absorption point. Therefore, it is difficult to leak from the peripheral edge of the rear flap 3.

In addition, when the flap absorber 33 and the main body absorber 23 are not integrated and are independent (separated) from each other, the flap absorber 33 and the main body absorber 23 are hardly affected by liquid diffusion by the absorbent main body 2.
Moreover, the upper layer main body absorber 23a and the integral absorber 13 are separate bodies.

The integral surface sheet 11 covers the entire upper surface of the aggregate (23a, 13) of the upper layer main body absorbent body 23a and the integral absorbent body 13. The peripheral edge portion of the integrated surface sheet 11 extends from the peripheral edge portion of the aggregate (23a, 13).
The integrated back sheet 12 covers the entire lower surface of the integrated absorbent body 13. The peripheral edge of the integrated back sheet 12 extends from the peripheral edge of the integrated absorber 13.

  And the peripheral part of the integrated surface sheet 11 and the peripheral part of the integrated back sheet 12 which are extended from the peripheral part of the aggregate | assembly (23a, 13) are joined by the heat seal, the hot-melt adhesive agent, etc. From another viewpoint, the flap topsheet 31 and the flap backsheet 32 are joined on the outer side of the peripheral edge of the flap absorber 33. Similarly, the wing topsheet 41 and the wing backsheet 42 are joined outside the peripheral edge of the wing absorber 43.

  In the rear flap 3, the flap topsheet 31 and the flap backsheet (flap leak-proof layer) 32 are both joined to the flap absorber 33. For this joining, for example, a hot melt adhesive is used. The application shape of the adhesive is not particularly limited, and examples thereof include a planar shape (so-called solid coating), a spiral shape, a stripe shape extending in the longitudinal direction or the width direction, an Ω shape, and a dot shape. In the present embodiment, the flap back sheet 32 and the flap absorber 33 are joined discontinuously by an adhesive (not shown) applied to the flap back sheet 32.

  In the absorbent main body 2, the main body back sheet 22 is bonded to the main body absorber 23. For this joining, for example, a hot melt adhesive is used. The application shape of the adhesive is not particularly limited, and examples thereof include a planar shape (so-called solid coating), a spiral shape, a stripe shape extending in the longitudinal direction or the width direction, an Ω shape, and a dot shape. In the present embodiment, the main body back sheet 22 and the main body absorber 23 are joined discontinuously by the adhesive applied to the main body back sheet 22.

  On the lower surface of the absorbent main body 2, the rear flap 3 and the wing portion 4, that is, at a predetermined position on the lower surface of the integrated back sheet 12, a main body adhesive portion, a flap adhesive portion and a wing adhesive portion (any (Not shown).

The material for forming each part of the sanitary napkin 1 will be described.
As the main body topsheet 21, the wing topsheet 41, and the integrated backsheet 12 (main body backsheet 22, flap backsheet 32, wing backsheet 42), various materials conventionally used for this type of absorbent article are used. It can be used without particular limitation. For example, as the surface sheet, nonwoven fabrics produced by various manufacturing methods, those obtained by forming holes in a resin film, laminates of these, and the like can be used. As the back sheet, a thermoplastic resin film with or without moisture permeability, a water-repellent nonwoven fabric, a laminate of these, and the like can be used.
As the upper layer main body absorbent body 23a, those conventionally used as absorbent bodies in absorbent articles can be used without particular limitation. The upper layer main body absorber 23a is preferably bulky and has a high liquid holding ability.

As shown in FIG. 4, the flap absorbent body 33 in the first embodiment is made of a polymer sheet in which an absorbent polymer 33d is blended with a fiber assembly 33c, and the upper surface side of the flap absorbent body 33 serves as a temporary liquid holding layer. It is supposed to function.
In the polymer sheet, in order to prevent the liquid permeability and liquid diffusibility from decreasing due to the swelling of the absorbent polymer, the absorbent polymer should not be present on the flap surface sheet 31 side, or the fibrous sheet is relatively difficult to swell. It is preferable to use an absorbent polymer in the form (hereinafter also referred to as “fibrous polymer”). In this embodiment, a fibrous polymer is used. When a fibrous polymer is used, the capillary diameter of the polymer sheet becomes smaller due to swelling of the fibrous polymer after absorption, so that the liquid is likely to diffuse (the ability to move the liquid from the area where the liquid retention is reduced). Is preferable from the viewpoint that the flap absorber 33 can be used effectively. Moreover, since the absorptive polymer is in a fibrous form, it is unlikely to fall off. From the viewpoint of preventing falling off, the absorbent polymer 33d is preferably bonded to the constituent fibers of the fiber assembly 33c.
Examples of the polymer sheet that has been devised to prevent the absorbent polymer from falling off include those described in JP-A-5-38350 and JP-A-8-232189.
In addition, the absorptive polymer from which the effect similar to a fibrous polymer is acquired can be obtained by arrange | positioning the raw material of an absorptive polymer directly on a constituent fiber, and superposing | polymerizing.

  As a polymer sheet in which the absorbent polymer does not exist on the flap surface sheet 31 side, the absorbent polymer is disposed between the two sheets, and the absorbent polymer is confined by a bonding method such as an adhesive, heat seal, or ultrasonic seal. Those are preferred. From the viewpoint of high absorbency and difficulty in removing the absorbent polymer, a method utilizing the wet adhesive strength of the absorbent polymer is particularly preferable.

  The flap absorber 33 is preferably made of a relatively thin sheet material in consideration of suitability for the curved shape of the wearer's body, followability to the wearer's body movement, etc., and irritation to the wearer's skin. In order to reduce the property (in order to increase dry feeling), it is more preferable that the liquid retention is high.

Density of the flap absorbent body 33 is preferably 0.05 to 0.3 g / c m ^3, more preferably a 0.07~0.2g / c m ^3.
Moreover, it is preferable that the density of the flap absorber 33 is higher than the density of the main body absorber (in this embodiment, lower layer main body absorber 23b) extended to this, 0.05-0.2 g / More preferably, it is about cm ³ higher.

As a method of making the density of the flap absorber 33 higher than the density of the main body absorber integrated therewith, for example, a method of applying heat and pressure between the rolls only to the rear flap, or the flap surface sheet 31 and the flap absorption There is a method of joining the body 33 by hot embossing or the like.
When the density of the flap absorber 33 is higher than the density of the main body absorber integrated with the flap absorber 33, the body fluid absorbed by the flap absorber 33 is less likely to return to the main body absorber integrated therewith. Is preferable.

  The buckling strength of the flap absorber 33 is preferably 20 to 500 g, and more preferably 50 to 300 g, from the viewpoint of preventing twisting and improving the wearing feeling. By setting the buckling strength to 20 g or more, the rear flap 3 is less likely to be twisted. On the other hand, by setting the buckling strength to 500 g or less, the entire rear flap 3 is prevented from becoming too hard, and it is uncomfortable when worn. You can avoid feeling.

The buckling strength is measured as follows.
[Measurement method of buckling strength]
The measurement is performed under the temperature and humidity conditions using an absorber left at 20 ° C. and 65% RH for one day or longer.

  Specifically, the absorber is cut into a length of 150 mm × width of 30 mm, and this is used as a sample. The longitudinal end portions of the sample are overlapped so that the width of the overlapped portion is 5 mm to form a ring shape. Thereafter, the upper and lower portions of 1 cm are fixed at two locations by a stapler so that the length direction of the needle is perpendicular to the compression direction, and a ring-shaped sample is obtained. The obtained ring-shaped sample is placed on the sample stage of a Tensilon tester [trade name “RTC-1210A” (manufactured by Orientec Co., Ltd.)] with the longitudinal direction of the sample as the bottom surface. After installation, the sample is compressed at a measurement speed of 10 mm / min in the compression test mode, and the maximum strength when buckling is obtained. Measurements were similarly made on five separately prepared samples, and the average was obtained as the buckling strength.

The flap absorber 33 and the wing absorber 43 are supplementary to absorb body fluid overflowing from the main body absorber 23, and preferably have low diffusibility during liquid absorption. Specifically, after 1 g of physiological saline is dropped from about 1 cm above the absorbent body with a 10 ml beaker, the absorption area after 1 minute is preferably 80 cm ² or less, more preferably 50 cm ² or less. . By setting the absorption area to 80 cm ² or less, the diffusion of the liquid can be delayed, and body fluid can be prevented from leaking due to excessive diffusion of the flap absorber 33 and the wing absorber 43.

The thickness of the flap absorber 33 is preferably 0.2 to 3 mm, more preferably 0.3 to ² mm under a load of 2.5 g / m ^{2 in} order to obtain preferable rigidity and diffusibility. .

  The description regarding the various physical properties of the flap absorber 33 described above also applies to the various physical properties of the wing absorber 43 as appropriate.

  Next, the flap surface sheet 31 will be described. As the flap surface sheet 31, a conventionally known material such as a nonwoven fabric or an apertured film can be used, but the temporary retention of the liquid as the entire flap absorbent layer (31, 33) can be further enhanced. Therefore, as shown in FIG. 4, it is preferable to be able to form a space (hereinafter also referred to as “stock space”) 34 in which the liquid can be temporarily held.

  As such a flap surface sheet 31, specifically, as shown in FIG. 4 and FIG. 5, one having a large number of projecting apertures 31 a projecting toward the flap absorber 33 can be mentioned. According to such a flap surface sheet 31, as shown in FIG. 4 (b) and FIG. 5, the region 31b in the flap surface sheet 31 in which the protrusion opening 31a is not provided and the flap absorber are formed by the protrusion opening 31a. 33 is separated. As a result, on the flap absorbent body 33 side of the flap surface sheet 31, the space between the adjacent protruding openings 31 a functions as the stock space 34.

The thickness of the entire flap surface sheet 31 having the protruding openings 31a is preferably 0.2 to 1.0 mm, more preferably 0.3 to 0.7 mm under a load of 0.5 gf / cm ² . The thickness is measured by KES-G5 (manufactured by Kato Tech Co., Ltd.).
The distance in the plane direction between the adjacent protruding openings 31a is preferably 0.5 to 5 mm. The area of the region surrounded by the three adjacent projecting openings 31a is preferably 0.1 to 10 mm ² from the viewpoint that the liquid can be easily held in the stock space 34 temporarily.

  For the same reason, it is preferable that the outer surface of the flap surface sheet 31 is formed with a wave-like structure extending at 0 to 30 ° in the longitudinal direction as shown in FIG. It is preferable that a protruding opening 31a is formed at the bottom on the side of the flap absorber 33 in the wavy structure. The flap surface sheet 31 is preferably formed of a film material because the stock space 34 tends to exist stably.

  The flap surface sheet 31 on which such a wave structure is formed will be described in detail. In the flap surface sheet 31, the space between the adjacent protruding openings 31a is curved in a convex shape toward the upper surface side so as to have a top portion. Moreover, the lower surface side corresponding to this top part in the flap surface sheet 31 is also curving convexly toward the upper surface side. That is, an arch shape is formed between adjacent projecting holes 31a. The plurality of apexes are connected substantially linearly to form the flanges 31e in multiple rows. The space between the adjacent flange portions 31e is a space portion 31f, and the space portions 31e and the space portions 31f are alternately arranged so as not to have a flat surface portion. A large number of projecting apertures 31a are formed in the intercostal space 31f at predetermined intervals. The distance between adjacent flanges 31e (that is, the distance between the tops) is preferably 0.5 to 5 mm, more preferably 0.8 to 3 mm. Similarly, the distance between the adjacent intercostal space portions 31f is preferably 0.5 to 5 mm, and more preferably 0.8 to 3 mm.

  The protruding opening 31a may have a shape (a shape having a constant height) that allows the entire lower end of the protruding opening 31a to come into contact with the flap absorber 33. However, in order to easily guide the liquid to the stock space 34, FIG. As shown in FIG. 4B, it is preferable to have a portion 31 c that contacts the flap absorber 33 and a portion 31 d that opens toward the stock space 34. Since the projecting hole 31a has the part 31c in contact with the flap absorber 33, the liquid can easily enter the stock space 34, and the part 31d opened toward the stock space 34 increases the amount of movement of the liquid. Can improve the dry feeling.

  If the protruding apertures 31a that do not contact the flap absorber 33 are present in the total number of the protruding apertures 31a, preferably 50% or more, more preferably 70% or more, particularly preferably 90% or more, The same effect is produced regardless of the presence or absence of the opened portion 31d. In this embodiment, the open portion 31d may be provided.

The opening shape of the protruding opening 31a is not particularly limited, and may be, for example, an elliptical, triangular, or quadrangular opening. However, a circular shape is preferable because the soft feeling of the flap surface sheet 31 can be improved.
The opening diameter of the circular protruding hole 31a is preferably 0.2 to 1.5 mm, and is preferably 0.3 to 1.0 mm from the viewpoint of improving the stability of the protruding opening 31a and the liquid permeability. More preferably. Moreover, from the point which improves the permeability | transmittance of a liquid, it is preferable that the aperture ratio of the flap surface sheet 31 is 3 to 30%, and it is still more preferable that it is 5 to 20%. The opening ratio is determined by opening the protruding opening 31a when the flap surface sheet 31 is projected from the upper surface (outer surface) side to the lower surface (inner surface) side using an image analysis device (NEW CUBE ver. 4.20 manufactured by NEXT). It is obtained by dividing the hole area by the area of the flap surface sheet 31.

  Furthermore, in order to enhance the liquid absorbability from the protruding opening 31a and to facilitate the liquid to be introduced into the stock space 34, it is also preferable that the surface of the opening film is subjected to hydrophilic treatment (surfactant treatment).

The flap surface sheet 31 having the protruding apertures 31a is flat between, for example, a male mold in which protrusions having a shape corresponding to the shape of the protruding apertures 31a are formed in a predetermined arrangement pattern and the elastic backing plate. It can be produced by pressing the film under heating.
Moreover, it can manufacture by sucking a thermoplastic film under a heating on the roll or conveyor provided with the suction net which has the hole shape of the arrangement pattern corresponding to the protrusion opening 31a.

  When the suction net has an aperture row in the same direction as the roll or conveyor, the tension applied in the aperture row and the tension applied in the other part when the thermoplastic film is peeled off from the suction net. Due to the difference, a groove structure (wave structure) is easily created in the thermoplastic film. In addition, due to this action, when the thermoplastic film is peeled off from the suction net, a force is exerted so that the front side of the protruding opening 31a is stretched, or the protruding opening 31a peeled off later comes into contact with the suction net again. In the protruding hole 31a, a portion inclined to the rear side (the opened portion 31d) is easily formed.

  The reason for this will be described from another point of view. In the thermoplastic film, the portions other than the row portion of the projecting apertures 31a are thicker than the row portion of the projecting apertures 31a and are continuous, and therefore peel off from the suction net according to the tension. On the other hand, the portion of the row of the protruding apertures 31a is fitted in the aperture of the suction net and the thermoplastic film is thin, so that the time difference is larger than the portion other than the portion of the row of the protruding apertures 31a. Open and peel off the suction net.

  The sanitary napkin 1 of the present embodiment is attached to an underwear such as shorts without being folded back with the rear flap 3 extended from the absorbent main body 2, and the wing portion 4 is folded to the outer surface side of the crotch portion of the underwear. Used.

  Specifically, in the sanitary napkin 1 of the present embodiment, the absorbent main body 2 is disposed on the inner surface of the crotch portion of the shorts, the rear flap 3 is disposed on the inner surface of the shorts, and the wing portion 4 is disposed on the outer surface of the crotch portion. Folded to the side, the absorbent main body 2, the rear flap 3 and the wing part 4 are attached to the inner surface or the outer surface of the shorts by the main body adhesive part, flap adhesive part and wing adhesive part, respectively, preventing misalignment. can do.

And in the sanitary napkin 1 of this embodiment, since the liquid which exuded from the back part B of the absorptive main body 2 and the liquid which flows without being absorbed can be effectively absorbed by the back flap 3, from the back part B Excellent liquid leakage prevention.
Similarly, since the liquid that has oozed out from the front part A of the absorbent main body 2 and the liquid that flows without being absorbed can be effectively absorbed by the wing part 4, the liquid leakage from the front part A is excellent.

  According to the sanitary napkin 1 of the first embodiment having the above configuration, since the flap absorbent body 33 is made of a polymer sheet in which the absorbent polymer 33d is blended with the fiber assembly 33c, the flap is secured while ensuring rigidity. The absorber 33 can be made thin, and the thickness of the flap absorption layers (31, 33) can be made thin. Moreover, since the upper surface side of the flap absorber 33 functions as a temporary liquid holding layer, the liquid absorbed in the flap absorber 33 is temporarily held and then absorbed by the absorbent polymer 33d. As a result, the liquid retention of the flap absorption layer (31, 33) can be increased, and the liquid return in the flap absorption layer (31, 33) can be reduced. In addition, the absorbent polymer 33d is bonded to the constituent fibers of the fiber assembly 33c and has a fibrous form, so that the absorbent polymer 33d is difficult to drop off.

  Further, the flap surface sheet 31 has a large number of projecting apertures 31a projecting toward the flap absorber 33, and the projecting apertures 31a are not provided with the projecting apertures 31a in the flap surface sheet 31. 31b and the flap absorber 33 are separated from each other. Therefore, a stock space 34 serving as a temporary liquid storage space is also formed in the flap surface sheet 31, and the liquid retention of the flap absorbent layers (31, 33) is further improved.

  Next, other embodiment of the absorbent article of this invention is described. In the other embodiments, differences from the first embodiment described above will be mainly described, and the same points are denoted by the same reference numerals and description thereof will be omitted. For the points that are not particularly described, the description of the first embodiment is applied as appropriate.

The absorbent article 1 of 2nd-4th embodiment mainly differs in the point from which the flap absorber 33 consists of the upper layer flap absorber 33a and the lower layer flap absorber 33b compared with 1st Embodiment.
In the flap absorber 33 in the second embodiment, as shown in FIG. 6, the upper-layer flap absorber 33a is made of a polymer sheet in the same manner as the flap absorber 33 in the first embodiment. On the other hand, the lower layer flap absorber 33b is made of a high density sheet having a narrow space between constituent fibers and a high density.

As the high density sheet, a compressed pulp fiber can be used, but from the viewpoint of flexibility after densification, a semi-synthetic fiber such as rayon fiber or polyethylene / polypropylene / polyester is used. It is preferable to use synthetic fibers. As a method of densifying the sheet, there is a method of consolidating such as heat embossing after forming into a non-woven fabric, but rayon can be obtained from the point that it can be a fiber structure having a narrow space between fibers to enhance the retention of liquid. It is preferable to use the spunlace method when the fiber is the main component, and the spunbond method or the melt blow method when the various synthetic fibers are the main component. Moreover, it is also preferable to use a split type fiber having a fiber diameter of about 0.1 to 0.5 dtex in which the fiber is split by a water flow or the like. The density of the high density sheet, in terms of liquid retention and flexibility, but is preferably 0.1 to 0.5 g / cm ^3, the density is 0.2-0.5 g / cm ^3, It is further preferable because the liquid retention is further enhanced.

  According to the absorbent article 1 of 2nd Embodiment, since the effect similar to 1st Embodiment is show | played, since the lower layer flap absorber 33b is a sheet | seat which is excellent in diffusivity, it is spreading | diffusion in the upper layer flap absorber 33a. It hardly occurs and the liquid diffuses in the lower flap absorber 33b. For this reason, the diffusibility of the surface of the back flap 3 is suppressed, the impression is good, and it has an effect gentle to the skin.

As shown in FIG. 7, the absorbent article 1 according to the third embodiment includes a bulky sheet in which the upper layer flap absorber 33 a is liquid permeable and / or liquid temporarily retained as compared with the second embodiment. Similar to the upper-layer flap absorber 33a in the second embodiment, the flap absorber 33b is mainly different in that it is made of a polymer sheet.
As such a bulky sheet, it is preferable to use a material having a density of about 0.01 to 0.05 g / cm ^3, a sheet laminated by an airlaid method and made into a non-woven fabric, or a heat bond whose volume has been recovered by hot air A type of nonwoven fabric is preferred. Such a bulky sheet has a liquid temporarily holding function and a shielding effect due to the difficulty of liquid diffusion. In particular, in the flap absorber 33, the target liquid is very small as compared with the main body absorber 23. Therefore, if the thickness is about 0.3 to 0.5 mm, sufficient function can be expressed.

Moreover, as the upper-layer flap absorber 33a, for example, a dry pulp sheet (trade name “JS-50HB” manufactured by Havix Co., Ltd., etc.) in which pulp is stacked and fixed with a binder, or embossed embossed on wet absorbent paper is used. Absorbent paper or the like can be used.
The embossed absorbent paper is embossed to increase the thickness of the absorbent paper and prevent the liquid from diffusing in one direction. The emboss pattern is not particularly limited, but it is preferably embossed in a dot shape at a density of 1 to 30 / cm ² .

  According to the absorbent article of the third embodiment, the same effects as in the second embodiment can be obtained, and since the upper layer flap absorber 33a has a stock function, the upper layer flap absorber 33a hardly diffuses, and the lower layer The liquid is diffused and held in the flap absorber 33b. For this reason, the diffusibility of the surface of the back flap 3 is suppressed, the impression is good, and it has an effect gentle to the skin.

  As shown in FIG. 8, the absorbent article 1 according to the fourth embodiment has an absorbent polymer 33 d having a particulate form and a particulate absorbent polymer as compared with the third embodiment. The main difference is that 33d is dispersed from the upper flap absorber 33a to the lower flap absorber 33b. About another structure, it is the same as that of 3rd Embodiment.

  According to the absorbent article of the fourth embodiment, in addition to the same effects as the third embodiment, the stock effect is achieved and the liquid can be quickly absorbed. Therefore, the upper layer flap absorber 33a does not diffuse. Difficult to occur, the diffusibility of the surface of the rear flap 3 is suppressed, the impression is good, and the skin-friendly effect.

In the present invention, the flap absorber 33 includes a polymer sheet in which the absorbent polymer 33d is blended with the fiber assembly 33c, and the upper surface side of the flap absorber 33 functions as a temporary liquid holding layer. If it is a thing, you may use the apertured sheet which has the aperture | opening which does not protrude as the flap surface sheet 31, and the non-apertured sheet | seat which does not have an aperture | open_hole.
Further, even if the flap surface sheet 31 does not have the protruding opening 31a that can separate the region 31b where the protruding opening 31a is not provided and the flap absorber 33, in the flap surface sheet 31 made of a nonwoven fabric, The fine uneven shape by the constituent fibers can exert an effect of suppressing the diffusion of the liquid, and the flap surface sheet 31 made of a film material also forms a small hole or small protrusion smaller than the protruding opening 31a. By doing so, the same effect can be obtained.

The absorbent article of the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist of the present invention.
For example, as shown in FIG. 9, the lower layer main body absorbent body 23 b may not be provided over the entire width direction of the absorbent main body 2 but may be provided separately only in the vicinity of both side portions of the absorbent main body 2. The main body absorber 23 may have a single layer structure or a plurality of structures.

Further, as shown in FIG. 10, the flap absorbent body 33 does not extend over the absorbent main body 2 and may not be integrated with the main body absorbent body 23.
The main body absorbent layer is not limited to a laminate of the main body surface sheet 21 and the main body absorber 23, and can be formed of an integral member having both functions.
The wing absorber 4 may not be provided in the wing portion 4. Moreover, the wing part 4 itself may not be present.
Each structure of each said embodiment can be combined suitably.

  The absorbent article of the present invention is not limited to sanitary napkins, and can be applied to, for example, panty liners (orimono sheets) and incontinence pads. The underwear to which the absorbent article of the present invention is attached is not limited to shorts.

1 Sanitary napkin (absorbent article)
2 Absorbent body 21 Body surface sheet 22 Body back sheet (body leakage prevention layer)
23 Main body absorbent body 23a Upper layer main body absorbent body 23b Lower layer main body absorbent body 3 Back flap 31 Flap surface sheet 31a Protruding hole 31b Region 31c where no projecting opening is provided Part 31d that contacts the flap absorber Open toward the stock space Part 31e collar part 31f collar part 32 flap back sheet (flap leak-proof layer)
33 Flap Absorber 33a Upper Flap Absorber 33b Lower Flap Absorber 33c Fiber Aggregate 33d Absorbent Polymer 34 Stock Space 4 Wing Part 41 Wing Top Sheet 42 Wing Back Sheet 43 Wing Absorber A Front Part B Rear Part

Claims (6)

Absorption having a substantially vertically long absorbent main body having a main body absorbent layer and a main body leak-proof layer and a pair of rear flaps extending outward in the width direction from at least both sides of the rear part of the absorbent main body. A sex product,
The rear flap includes a flap topsheet, a flap backsheet, and a flap absorber interposed therebetween,
The flap absorber comprises a laminate of an upper layer flap absorber and a lower layer flap absorber,
The flap surface sheet has a number of projecting apertures projecting toward the flap absorber, and the projecting apertures provide a region where the projecting apertures are not provided in the flap surface sheet and the flap. A stock space capable of temporarily holding a liquid is formed between the region and the flap absorber, the absorber being spaced apart ,
The protruding opening is an absorbent article having a portion that contacts the flap absorber and a portion that opens toward the stock space . The absorbent article according to claim 1, wherein the upper layer flap absorber hardly diffuses liquid, and the lower layer flap absorber diffuses liquid . The upper layer flap absorber is made of a bulky sheet having a density of 0.01 to 0.05 g / cm ³ , and the lower layer flap absorber is made of a polymer sheet in which an absorbent polymer is blended in a fiber assembly. Or the absorbent article of 2. The absorbent article according to claim 3 , wherein in the polymer sheet, the absorbent polymer is bonded to constituent fibers of the fiber assembly. The main body absorption layer includes a main body absorber,
The flap absorber extends over the entire width direction of the absorbent main body and is directly integrated with a part of the main body absorber, or is separate from the flap absorber. The absorbent article according to any one of claims 1 to 4, wherein the absorbent article is indirectly integrated with a part of the main body absorbent by being partially overlapped with a part of the body. The absorbent article according to any one of claims 3 to 5 , wherein the absorbent polymer has a fibrous form.

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