JP4491005B2 - Sanitary napkin - Google Patents

Description

  The present invention relates to a sanitary napkin provided with standing gathers on both sides.

As this type of sanitary napkin, there is one disclosed in Patent Document 1 and the like. The sanitary napkin disclosed in Patent Document 1 is a liquid-impervious top sheet 101 made of a nonwoven fabric sheet or the like and a liquid-impervious liquid made of a polyethylene sheet, a polyethylene sheet laminated nonwoven fabric sheet or the like, as shown by reference numeral 100 in FIG. A structure in which an absorbent body 103 made of cotton-like pulp or the like that absorbs body fluid such as menstrual blood or a cage is interposed between the conductive back sheet 102 and a standing gather 110 for preventing side leakage is provided on both sides. It has become. The standing gather 110 has an inner standing gather 111 projecting inward (inward) from the standing base end, the standing base end being located on or outside the standing base end of the inner standing gather 111, and A so-called double gather is formed of an outer standing gather 112 that protrudes outward (toward the outside) from the standing base end. According to this conventional sanitary napkin 100, the side leakage of the body fluid excreted on the top sheet 101 between the two standing gathers 110 is prevented by the inner standing gathers 111, and the body fluid temporarily gets over the inner standing gathers 111. Even if it is, it is blocked by the outer standing gathers 112. Therefore, even when lying on the side, there is no risk of side leakage of body fluid, which is very useful.
However, this conventional sanitary napkin 100 has the following problems.
That is, according to the conventional sanitary napkin 100, the massive menstrual blood K that is difficult to be absorbed by the top sheet 101 or the absorbent body 103 is placed on the top sheet 101 outside (downside) when the wearer lies down sideways. It slides toward and stays between the top sheet 101 and the inner standing gathers 111 as shown in FIG. Therefore, when the wearer gets up, the clumped menstrual blood K returns to the center side (inner side) in the width direction of the top sheet 1 and returns to the inner side as shown in FIG. Touches the skin of the wearer and causes discomfort such as stickiness.
Japanese Patent Laid-Open No. 11-318981

  While the main problem to be solved by the present invention is excellent in the effect of preventing side leakage, for example, even when the wearer wakes up from lying down, the wearer may feel uncomfortable such as stickiness. There is no sanitary napkin to provide.

The present invention that has solved this problem is as follows.
[Invention of Claim 1]
A sanitary napkin in which an absorbent body is interposed between the liquid-permeable top sheet and the liquid-impermeable back sheet, and each of the both sides is provided with a standing gather,
The two standing gathers are respectively inner standing gathers protruding outward in the width direction from the standing base ends,
An outer standing position in which the standing base end is located outside the standing base end of the inner standing gather and protrudes above the inner standing gather, and at least the projecting direction of the portion protruding upward is inward in the width direction . It consists of gathers ,
An inner standing gather base end fixed on the side of the absorber, and an inner side protruding outward in the width direction with the end of the inner standing gather base end in the width direction as the standing base end An inner standing gather sheet having standing gather projections, the front and rear ends of the inner standing gather projections being fixed, and the other than the front and rear ends being non-fixed standing parts;
An inner standing gather elastic elastic member fixed in a stretched state along the front-rear direction to the standing tip of the inner standing gather protrusion,
The inner standing gather is constituted by a portion of the inner standing gather protrusion and does not include an absorber.
The width of the outer standing gather base end fixed to a position spaced outward in the width direction from the standing base end of the inner standing gather, and the widthwise center side edge of the outer standing gather base end as a standing base end An outer standing gather sheet having an outer standing gather projecting portion projecting inward in the direction, the front and rear end portions of the outer standing gather projecting portion being fixed, and other than the front and rear end portions being unfixed standing portions;
An outer standing gather elastic elastic member fixed in a stretched state along the front-rear direction to the standing tip of the outer standing gather protrusion,
The outer standing gather is constituted by a portion of the outer standing gather protrusion and does not include an absorber.
The standing base end of the inner standing gather is spaced from the side edge of the absorber to the center in the width direction ,
A sanitary napkin characterized by that.

[Invention of Claim 2]
The sanitary napkin according to claim 1, wherein an upright proximal end of the outer upright gather is located on an outer side in the width direction of the absorbent body.

[Invention of Claim 3]
The sanitary napkin according to claim 1 or 2, wherein a standing tip of the outer standing gather is positioned inside a standing tip of the inner standing gather.

[Invention of Claim 4]
The front side surface of the inner standing gather is water repellent, the back side surface of the outer standing gather is hydrophilic, and the front side surface between the standing base end of the inner standing gather and the standing base end of the outer standing gather is the The sanitary napkin according to any one of claims 1 to 3, wherein the sanitary napkin is stronger in hydrophilicity than in the back side surface of the outer standing gathers.

[Invention of Claim 5]
The sanitary napkin according to any one of claims 1 to 4, wherein the inner standing gather and the outer standing gather protrude in a bulging state on the front side.

[Invention of Claim 6]
A plurality of embosses along the width direction are provided between the two standing gathers in a state of being separated in the front-rear direction, and the side ends of the embossed gathers are directed to the vicinity of the center part in the front-rear direction of the inner standing gathers. The sanitary napkin according to any one of 1 to 5.

  According to the present invention, the sanitary napkin is excellent in the effect of preventing side leakage, and does not cause any uncomfortable feeling such as stickiness to the wearer even when the wearer wakes up from lying down. .

Next, an embodiment of the present invention will be described.
As shown in FIGS. 3 and 4, the sanitary napkin X of the present embodiment includes a top sheet 1 made of a liquid permeable sheet such as a non-woven cloth sheet or a mesh sheet, and a back sheet made of a liquid permeable sheet such as a polyethylene sheet. 2 is a basic structure in which the absorber 3 is interposed between the two.
The absorbent body 3 has a property of absorbing bodily fluids such as menstrual blood, and is composed of, for example, cotton, piled pulp, superabsorbent polymer, or the like. As this absorber 3, for example, a lower absorbent core and an upper absorbent core narrower than the lower absorbent core laminated on the widthwise center of the lower absorbent core are made of crepe paper, tissue paper or the like. A core sheet having a certain degree of hardness that is wound in a forehead with a covering sheet to be used can be suitably used. In this laminated form, the lower absorbent core can be omitted for improving the fit and absorbency to the skin, for example, by fitting the emboss formation method as described later, the fit to the skin It can also improve the performance.
Moreover, in this embodiment, a second sheet made of a non-woven cloth or the like can be laminated between the top sheet 1 and the absorbent body 3 to improve the diffusibility of body fluid.

  The sanitary napkin X of this embodiment is provided with standing gathers 10 having a function of preventing side leakage of body fluid on both sides. The standing gathers 10 are so-called double gathers each having an inner standing gather 11 and an outer standing gather 12. However, unlike the conventional double gather, first, the inner standing gather 11 protrudes outward (toward the outside) from the standing base end 11a. Further, the outer standing gathers 12 have the standing base ends 12 a located outside the standing base ends 11 a of the inner standing gathers 11 and protrude upward from the inner standing gathers 11. That is, the standing tip 12 b of the outer standing gather 12 is positioned above the standing tip 11 b of the inner standing gather 11. Furthermore, at least the protruding direction of the portion 12A of the outer standing gather 12 protruding upward from the inner standing gather 11 is the inward direction in the illustrated example, the protruding direction of the entire region from the standing base end 12a to the standing tip 12b. Yes. In this embodiment, first, the inner standing gather 11 protrudes outward from the standing base end 11a. Therefore, when the wearer lies sideways as shown in FIG. It slides (moves) on the front side surface 11c of the gather 11 toward the outside. The outer standing gather 12 protrudes upward from the inner standing gather 11, and the projecting direction of the portion 12A projecting upward is the inward direction, so that it slides on the front side surface 11c of the inner standing gather 11. The menstrual blood K hits the protruding portion 12A. Therefore, it stays in this state without moving further in the lateral direction, and lateral leakage is prevented. On the other hand, when the wearer tries to get up from the state of lying sideways, the clumped menstrual blood K slides on the back side surface 12c of the outer standing gather 12 as shown in FIG. It enters into the pocket space 20 between the gathers 12. In this state, as shown in FIG. 7, the inward movement of the massive menstrual blood K is blocked by the inner standing gathers 11, and the outward movement is blocked by the outer standing gathers 12. Therefore, there is no possibility of giving the wearer an unpleasant feeling such as stickiness, and side leakage is also prevented.

Here, the standing angle α (see FIG. 4) of the inner standing gather 11 is not particularly limited, but is usually 10 to 80 °, preferably 30 to 45 °. When the standing angle α is less than 30 °, the pocket space 20 is difficult to be formed. On the other hand, when the standing angle α exceeds 45 °, the massive menstrual blood K is difficult to move outward. Similarly, the standing angle β (see FIG. 4) of the outer standing gather 12 is not particularly limited, but is usually 20 to 90 °, preferably 45 to 60 °. When the standing angle β is less than 45 °, the opening of the pocket space 20 becomes narrow, and the clumped menstrual blood K does not easily enter the pocket space 20. On the other hand, when the standing angle β exceeds 60 °, the standing tip 12b is difficult to be positioned inside the standing tip 11b, and the menstrual blood K that has entered the pocket space 20 cannot be wrapped.
On the other hand, the method of raising the outer standing gathers 12 to be higher than the inner standing gathers 11 is not particularly limited. It is preferable to employ a method in which the height is increased in the outer standing gathers 12 than in the inner standing gathers 11. The tension in the inner standing gather 11 is usually 100 to 200%, preferably 130 to 150%, and the tension in the outer standing gather 12 is usually 120 to 250%, preferably 150 to 170%.

By the way, in this form, the formation method of each standing gathers 11 and 12 is not specifically limited. For example, a conventionally known appropriate sheet (gather sheet) is folded or laminated, and an elastic elastic member such as rubber thread (inner standing gather elasticity) between gather sheets constituting the standing tips 11b and 12b. For example, a method of fixing an elastic member, an outer standing gather elastic elastic member) in an extended state with an adhesive such as hot melt can be employed.
In particular, the inner standing gather 11 of this embodiment is folded so that one gather sheet forms the standing base end 11a, and one part (inner standing gather base end) from the folded portion is the top sheet 1, It is fixed to the backsheet 2 or the like by hot melt or the like, and the other part forms a standing gather 11. The other part of the gather sheet (inner standing gather projection) is fixed with an adhesive such as hot melt in a state of being laminated on one part of the gather sheet at the front and rear ends, and is fixed except for the front and rear ends. It has become a standing part that is not. Therefore, the upright portion reliably protrudes outward from the upright base end 11a due to the contraction force of the elastic elastic member (inner upright gather elastic elastic member) in the mounted (use) state where the product has a boat shape. To stand up.

On the other hand, in the outer standing gather 12 of this embodiment, one gather sheet is folded so that the standing base end 12a is formed, and one portion (outer standing gather base end portion) is the inner standing gather from the folded portion. 11 is fixed to the gather sheet, the back sheet 2 and the like constituting 11 by hot melt or the like, and the other part (outer standing gather protruding portion) constitutes the standing gather 12. As shown in FIG. 8, the other part of the gather sheet is fixed by an adhesive such as hot melt in a state of being laminated on the gather sheet constituting the inner standing gather 11, as shown in FIG. Other than the part, it is an upright part that is not fixed. Therefore, this standing portion also projects inwardly from the standing base end 12a by the contraction force of the elastic stretchable member (outer standing gather elastic stretchable member) in the mounted (use) state where the product has a boat shape. To stand up. Moreover, according to this form, there is no possibility that the inner standing gathers 11 may protrude beyond the outer standing gathers 12.

Here, the standing range L1 (see FIG. 3) of the inner standing gather 11 and the standing range L2 (see FIG. 3) of the outer standing gather 12 are not particularly limited. However, L1 / L2 is usually 0.7 to 1, preferably 0.8 to 0.9. When L1 / L2 is less than 0.8, the standing angle β becomes too large with respect to the standing angle α, and the standing tip 12b is difficult to be positioned inside the standing tip 11b. On the other hand, when L1 / L2 exceeds 0.9, it becomes difficult to make a difference between the standing angle α and the standing angle β, and the standing tip 12b is difficult to be positioned above the standing tip 12a.
In this embodiment, in order for the standing tip 12b of the outer standing gather 12 to be positioned above the standing tip 11b of the inner standing gather 11, the adjustment of the elastic force of the elastic elastic member described above, It is also possible to adjust the protruding length of the gathers 11 and 12.

  In this embodiment, the gather sheet constituting the outer standing gather 12 extends to the side of the absorber 3 up to the same position as the back sheet 2, and the gather sheet constituting the inner standing gather 11 is on the side of the absorber 3. It extends to the middle of the back sheet 2. That is, the side flaps are constituted by the back sheet 2 and the two gather sheets, and the side edges of the sanitary napkin are regulated by the back sheet 2 and the gather sheets constituting the outer standing gathers 12. And as shown in FIG. 3, the extension of the gather sheet | seat which comprises this outside standing gather 12, and the back seat | sheet 2 becomes especially long in the center part in the front-back direction, and this lengthened part is the back side of the underwear ( A wing W that is folded back and fixed to the outer surface side is configured. Further, this extension is also long at the rear end portion in the front-rear direction, and this long portion is used as a so-called end flap W1 that improves the fit to the buttocks and the body fluid leakage preventing effect from the buttocks.

On the other hand, the top sheet 1 and the back sheet 2 extend forward and rearward from the absorber 3 to form front and rear flaps, and the edges of the front and rear flaps are joined by heat sealing (heating fusion) or the like. It regulates the front and rear edges of sanitary napkins.
Here, the outer surface of the back sheet 2 is usually provided with a fastening portion for underwear such as shorts. The fastening portion can be formed by, for example, applying a pressure-sensitive adhesive made of a styrene / butadiene copolymer, a styrene / olefin copolymer, or the like in a strip shape in the front-rear direction. This fastening part is for fastening the sanitary napkin X to the underwear at the time of wearing, but in the stage of providing the sanitary napkin X to the consumer, a release sheet for individual packaging, etc. You can also put on. The release sheet is made of a polyethylene sheet, a polypropylene sheet, a polyethylene terephthalate sheet, a laminated paper, or the like, and can be peeled from the fastening portion.

[More preferred form]
(1) In this embodiment, as shown above, the standing base end 11 a of the inner standing gather 11 is positioned on the absorber 3, and the standing base end 12 a of the outer standing gather 12 is lateral to the absorber 3. It is preferable that it is located in. According to this form, in addition to the inner standing gathers 11, the side surface of the absorbent body 3 also functions to prevent inward movement of the massive menstrual blood K that has entered the pocket space 20. Therefore, the return of menstrual blood K onto the top sheet 1 is reliably prevented. From this viewpoint, the thickness (height) of the absorber 3 is usually 1 to 10 mm, preferably 5 to 8 mm.
The effect of preventing the return of menstrual blood K can be obtained even if the standing (projecting) height of the inner standing gather 11 is increased. However, if the standing height of the inner standing gather 11 is increased, menstrual blood on the top sheet 1 is obtained. There is a possibility that the outward movement of K is blocked by the inner standing gathers 11. In this case, menstrual blood K does not enter the pocket space 20 and stays on the top sheet 1, so that discomfort such as stickiness is not eliminated.
From the viewpoint of preventing the menstrual blood K from moving outward and preventing the menstrual blood K from moving inward, the standing height of the inner standing gather 11 is usually 5 to 10 mm, preferably 8 to 10 mm.

(2) In this embodiment, as shown in FIG. 9, the standing tip 12 b of the outer standing gather 12 is preferably positioned on the inner side (width direction center side) than the standing tip 11 b of the inner standing gather 11. According to this form, since the surface side of the pocket space 20 is completely covered by the outer standing gathers 12 and the inner standing gathers 11, the outflow of menstrual blood K from the pocket space 20 is reliably prevented. Further, it is possible to prevent the standing tip 11b of the inner standing gather 11 from being positioned above the standing tip 12b of the outer standing gather 12 as the wearer moves. From such a point of view, it is preferable that the standing tip 12b of the outer standing gather 12 is generally located 1-20 mm, preferably 5-10 mm inside, from the standing tip 11b of the inner standing gather 11.

(3) In this embodiment, as shown in FIG. 7, the front side surface 11c of the inner standing gather 11 is water-repellent, the rear side surface 12c of the outer standing gather 12 is hydrophilic, and the inner standing gather 11 stands. The front side surface (hereinafter also referred to as “bottom surface”) 20 c between the base end 11 a and the upright base end 12 a of the outer upright gather 12 is preferably stronger than the inner side surface 12 c of the outer upright gather 12. When the front side surface 11c of the inner standing gather 11 is water-repellent, the massive menstrual blood K smoothly slides outward on the front side surface 11c. In addition, when the back side surface 12c of the outer standing gather 12 is hydrophilic, the massive menstrual blood K that collides with the protruding portion 12A of the outer standing gather 12 quickly diffuses to the standing base end 12a side of the outer standing gather 12. Entry of menstrual blood K into the pocket space 20 is promoted. Further, if the bottom surface 20c is more hydrophilic than the inner side surface 12c of the outer standing gather 12, the menstrual blood K is stuck to the bottom surface 20c and travels back through the inner side surface 12c of the outer standing gather 12. There is no fear. For these reasons, according to the present embodiment, the menstrual blood K is reliably confined in the pocket space 20.
In addition, in the example of illustration, the bottom face 20c is comprised with the gather sheet | seat which comprises the inner side upright gathers 11. FIG.

(4) In this embodiment, as shown in FIG. 10, it is preferable to configure a part 12B of the outer standing gather 12 so that the protruding direction is the outward direction (step gather). According to this form, the standing height of the outer standing gathers 12 can be increased, and the side leakage of body fluid can be more reliably prevented. In this regard, the height of the outer standing gathers 12 can be increased without using step gathers, but if the height of the outer standing gathers 12 is increased without using step gathers, it becomes easy to cause dripping or the like, so that side leakage is prevented. The certainty of effect expression is reduced. By the way, the standing height of the outer standing gather 12 is usually 10 to 20 mm, preferably 13 to 15 mm when not used as a step gather, whereas it is usually 15 to 45 mm, preferably when used as a step gather. Is 25-30 mm.

(5) In this embodiment, as shown in FIG. 11, it is preferable that the inner standing gathers 11 and the outer standing gathers 12 protrude in a swelled state on the front side. When the inner standing gathers 11 protrude in a state where they swell to the front side, the massive menstrual blood K easily moves outward on the inner standing gathers 11. On the other hand, when the outer standing gathers 12 protrude in a state where they swell to the front side, the massive menstrual blood K that has entered the pocket space 20 does not easily flow out of the pocket space 20.
Here, the specific method for making the inner standing gathers 11 and the outer standing gathers 12 swell to the front side is not particularly limited. For example, a plurality of the elastic elastic members described above are provided not only in the vicinity of the standing tips 11b and 12b but at an appropriate interval, and the elastic stretching members on the side of the standing tips 11b and 12b increase the stretching force (tension) For example, a method of fixing the elastic stretchable sheet in an extended state to the back side surface of the standing gathers 11 or the back side surface 12c of the outside standing gathers 12 can be employed.

(6) In this embodiment, as shown in FIG. 3, a plurality of embossed E1s extending in the width direction are provided between both raised gathers 10 and 10 in a state of being separated in the front-rear direction, and the side end portions of these embossed E1s are inside. It is set as the structure which goes to the front-back direction center part vicinity of the standing gathers 11. FIG. When a plurality of the embossed E1s along the width direction are provided in a state of being separated in the front-rear direction, the massive menstrual blood K is guided to the outside along the embossed E1. If it is set as the structure which goes to the front-back direction center part vicinity, the said lump-like menstrual blood K will be reliably accommodated in the pocket space 20. FIG.
The distance between the embossed E1 adjacent to each other is not particularly limited, but is usually 10 to 20 mm, preferably 13 to 16 mm at the inner end, and usually 5 to 10 mm at the outer end (side end). Preferably it is 6-8 mm.

(7) In this embodiment, as shown in FIG. 3, an emboss E2 that is elongated in the longitudinal direction and closed in the circumferential direction is formed at the center in the width direction of the absorber 4, and this emboss E2 It is preferable that the absorbent body 3 in the sectioned region has a high mid-high portion on the skin surface side. If the thickness of the middle-high part is too thick, the rigidity of the absorbent body 3 is increased and the adhesion to the body is lowered, so that it is usually 5 to 20 mm, preferably 13 to 18 mm.
In this respect, in the case where the middle and high portions are provided, the embossing E1 is formed so that the embossing E1 does not reach the absorber 3 in the region defined by the embossing E2 (surface embossing). Outside, it is good to form so that the embossing E1 may reach the absorber 3 (fit embossing).

[Others]
The planar shape of the sanitary napkin X of this embodiment is not particularly limited. For example, even if the sanitary napkin X is symmetric with respect to the front-rear direction (form without the end flap W1), it has the end flap W1 and is asymmetric with respect to the front-rear direction. There may be.

  The present invention is applicable as a sanitary napkin provided with standing gathers on both sides.

It is a schematic cross section of the conventional sanitary napkin. It is a schematic cross section of the conventional sanitary napkin in the state which laid down sideways. It is a top view of the sanitary napkin of this Embodiment. It is the IV-IV line arrow directional view of FIG. It is a schematic cross section of the sanitary napkin of this Embodiment in the state which laid down sideways. It is a schematic cross section of the sanitary napkin of this Embodiment in the case of trying to get up from the state which laid down sideways. It is a schematic cross section of the sanitary napkin of this Embodiment in the case of getting up from the state which laid down sideways. It is a schematic cross section which shows the lamination | stacking relationship of the standing gather in a front-and-back end part. It is a schematic cross section which shows the other example of a sanitary napkin. It is a schematic cross section which shows the other example of a sanitary napkin. It is a schematic cross section which shows the other example of a sanitary napkin.

  DESCRIPTION OF SYMBOLS 1 ... Top sheet, 2 ... Back sheet, 3 ... Absorber, 10 ... Standing gather, 11 ... Inside standing gather, 12 ... Outside standing gather, 20 ... Pocket space, E1, E2 ... Embossing, X ... Sanitary napkin.

Claims (6)

A sanitary napkin in which an absorbent body is interposed between the liquid-permeable top sheet and the liquid-impermeable back sheet, and each of the both sides is provided with a standing gather,
The two standing gathers are respectively inner standing gathers protruding outward in the width direction from the standing base ends,
An outer standing position in which the standing base end is located outside the standing base end of the inner standing gather and protrudes above the inner standing gather, and at least the projecting direction of the portion protruding upward is inward in the width direction . It consists of gathers ,
An inner standing gather base end fixed on the side of the absorber, and an inner side protruding outward in the width direction with the end of the inner standing gather base end in the width direction as the standing base end An inner standing gather sheet having standing gather projections, the front and rear ends of the inner standing gather projections being fixed, and the other than the front and rear ends being non-fixed standing parts;
An inner standing gather elastic elastic member fixed in a stretched state along the front-rear direction to the standing tip of the inner standing gather protrusion,
The inner standing gather is constituted by a portion of the inner standing gather protrusion and does not include an absorber.
The width of the outer standing gather base end fixed to a position spaced outward in the width direction from the standing base end of the inner standing gather, and the widthwise center side edge of the outer standing gather base end as a standing base end An outer standing gather sheet having an outer standing gather projecting portion projecting inward in the direction, the front and rear end portions of the outer standing gather projecting portion being fixed, and other than the front and rear end portions being unfixed standing portions;
An outer standing gather elastic elastic member fixed in a stretched state along the front-rear direction to the standing tip of the outer standing gather protrusion,
The outer standing gather is constituted by a portion of the outer standing gather protrusion and does not include an absorber.
The standing base end of the inner standing gather is spaced from the side edge of the absorber to the center in the width direction ,
A sanitary napkin characterized by that. The sanitary napkin according to claim 1, wherein an upright proximal end of the outer upright gather is located on an outer side in the width direction of the absorbent body. The sanitary napkin according to claim 1 or 2, wherein a standing tip of the outer standing gather is positioned inward in a width direction from a standing tip of the inner standing gather.   The front side surface of the inner standing gather is water repellent, the back side surface of the outer standing gather is hydrophilic, and the front side surface between the standing base end of the inner standing gather and the standing base end of the outer standing gather is the The sanitary napkin according to any one of claims 1 to 3, wherein the sanitary napkin is stronger in hydrophilicity than in the back side surface of the outer standing gathers.   The sanitary napkin according to any one of claims 1 to 4, wherein the inner standing gather and the outer standing gather protrude in a bulging state on the front side.   A plurality of embosses extending in the width direction between the two standing gathers are provided in a state of being separated in the front-rear direction, and the side end portions of the embossed gathers are directed to the vicinity of the center part in the front-rear direction of the inner standing gathers. The sanitary napkin according to any one of 1 to 5.

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