JP5232502B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article such as a sanitary napkin.

  Patent Document 1 discloses a sanitary napkin in which inner compressed grooves are formed on the left and right sides of an absorbent body so as to extend in the vertical direction, and the outer compressed grooves are formed on the outer side of the inner compressed groove with a space therebetween. It is disclosed.

  In Patent Document 2, side leak-proof grooves extending in the longitudinal direction are formed on both left and right sides of the absorber, and connected leak-proof grooves that connect the side leak-proof grooves are formed on the front and rear sides of the absorber. A sanitary napkin provided with leak-proof walls having elastic members on both sides is disclosed. This sanitary napkin is configured to be individually packaged by folding a portion where there is no stretching force due to an elastic member as a bent portion.

Patent Document 3 discloses a sanitary napkin in which leakage preventing grooves are provided on both the left and right sides of an absorbent body, a leakage preventing wall is provided outside the leakage preventing groove, and an elastic member extending in the longitudinal direction is provided on the leakage preventing wall in an extended state. Is disclosed.
JP 2004-181084 A Japanese Patent No. 3824452 JP 2007-89906 A

  However, in the sanitary napkin of Patent Document 1, the inner compression groove and the outer compression groove have a shape that gradually spreads from the front center region to the middle center region, so that the pressure from the thigh acting during use is forward. Concentrates on one central area, so the absorber is lifted toward the vagina mouth of a woman, and it is easy to reliably receive blood discharged from the vagina mouth, but it cannot be securely attached to clothing such as shorts. In this case, a pinpoint fit at a single point results in a gap between the vaginal opening and blood leakage due to this gap.

  In the sanitary napkin of Patent Document 2, when the portion of the leak-proof wall on which the elastic member's expansion / contraction force is applied is folded, the leak-proof wall is crushed by this folding and the leak-proof effect is lost. For this reason, it is necessary to fold the portion of the elastic member where the expansion / contraction force is not applied, and the folded portion is limited, so that the portion having the leak-proof effect is reduced, and as a result, the leak-proof effect is lowered and blood is reduced. There is a problem of leakage.

  In the sanitary napkin of Patent Document 3, when the expansion force of the elastic member is increased to enhance the leakage prevention effect of the leakage prevention wall, the rigidity cannot be kept standing as the leakage prevention wall due to low rigidity, resulting in blood leakage. To do. In addition, when two inner leakage grooves and two outer leakage grooves are formed on both the left and right sides of the absorber to enhance the leakage prevention effect of the portion facing the wearer's excretion part, one leakage prevention groove is added. For this reason, there is a problem that the area of the portion facing the excretion portion becomes smaller and blood leakage occurs.

  Then, an object of this invention is to provide the absorbent article which can prevent the leakage of blood effectively.

  The absorbent article according to claim 1 includes a body fluid-permeable top sheet, a body fluid-impermeable back sheet, and an absorbent body interposed between the top sheet and the back sheet, and the width of the absorbent body. Absorption provided with a pair of leak-proof walls provided along the longitudinal direction on both sides in the direction, and between the pair of leak-proof walls and leak-proof grooves provided on both sides of the skin contact portion of the absorbent body The leak-proof groove has a portion that protrudes in an arc shape toward the outer side in the width direction at both sides in the width direction of the skin contact portion, and the leak-proof wall and the leak-proof member in the absorber. A compression part having higher rigidity than that of a region including the skin contact portion of at least one pair of leakage prevention grooves is provided in a region between the grooves.

  Invention of Claim 2 is an absorbent article of Claim 1, Comprising: The said compression site | part is an embossing part which compression-formed the said absorber by embossing, It is characterized by the above-mentioned.

  Invention of Claim 3 is an absorbent article of Claim 1 or Claim 2, Comprising: The said compression site | part is folding in the center part of the absorbent article at the time of being folded and packaged in a longitudinal direction. It is characterized by being formed continuously or intermittently between the curved portion and the front end of the absorber.

  According to the present invention, in the region between the leak-proof wall and the leak-proof groove, the compression part having higher rigidity than the region including the skin contact portion of the pair of leak-proof grooves is provided, so that it is difficult to be crushed by body pressure during use. In addition, the standing property of the leak-proof wall is improved and blood leakage can be reliably prevented.

  Hereinafter, the present invention will be specifically described with reference to an embodiment shown in the drawings. FIG. 1 is a plan view showing a developed state of an embodiment of a sanitary napkin as an absorbent article, FIG. 2 is a cross-sectional view taken along the line MM of FIG. 1, and FIG. 3 is a plan view showing a procedure for individual packaging.

  A sanitary napkin (hereinafter referred to as a napkin) 1 has a long vertically long shape at the rear part in the longitudinal direction so as to cover the vicinity of the tailbone. As shown in FIGS. 1 and 2, the sanitary napkin 1 includes a top sheet 2 as a liquid-permeable top layer, a back sheet 3 as a liquid-impermeable back layer, a top sheet 2 and a back sheet 3. And an absorbent body 4 as a liquid-retaining absorbent layer interposed therebetween.

  As the surface sheet 2, a porous or non-porous nonwoven fabric or a porous plastic sheet can be used. As the back sheet 3, a hydrophobic nonwoven fabric, a water-impermeable plastic film, a laminate sheet of a nonwoven fabric and a water-impermeable plastic film, or the like can be used. Not limited to this, an SMS nonwoven fabric sandwiched between a melt-blown nonwoven fabric having high water resistance or a spunbond nonwoven fabric having high strength may be used.

  As the absorber 4, a fluffy pulp, an airlaid nonwoven fabric, or a superabsorbent polymer can be used. As the fluffy pulp, artificial cellulose fibers such as chemical pulp, cellulose fibers, rayon and acetate can be selected. As the air laid nonwoven fabric, a nonwoven fabric in which pulp and synthetic fiber are thermally fused or fixed with a binder can be selected. As the superabsorbent polymer, a starch-based, acrylic acid-based or amino acid-based particulate or fibrous polymer can be selected. As the non-woven fabric, non-woven fabrics such as spunlace, spunbond, thermal bond, melt blown, needle punch, and air through can be selected. As the raw material fibers constituting the nonwoven fabric, synthetic fibers such as polyethylene or polypropylene such as olefin, polyester and polyamide, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used.

  A pair of leak-proof walls 5 and 5 are arranged along the longitudinal direction on the left and right side portions of the napkin 1 on the surface sheet 2 side. The leak-proof walls 5 and 5 stand from the vicinity of the left and right side edges of the absorber 4.

  The napkin 1 includes an excretion part facing part B that is a part facing the excretion part of the wearer when worn, and a front part A and a first part that are adjacent to the excretion part facing part B and located in front and rear of the napkin 1, respectively. It is divided into a rear part C and a second rear part D. These divisions are made by the bent portions 21, 22, and 23. The front portion A and the excretory portion facing portion B are divided by the bent portion 21, and the excretory portion facing portion B and the first rear portion C. Is divided by a bent portion 22, and the first rear portion C and the second rear portion D are divided by a bent portion 23. The excretion part opposing part B becomes a skin contact part which contacts a wearer's skin.

  The back sheet 3 extends outward from the side edge of the absorbent body 4 and forms a pair of wings 6 at the position of the excretory part facing part B of the napkin 1. Although not shown, an adhesive layer for fixing the napkin 1 to the clothing is formed on the clothing facing surfaces of the back sheet 3 and the wing 6. The adhesive layer is protected by a release paper (not shown). Each of the top sheet 2 and the back sheet 3 extends from the front and rear ends of the absorber 4, and the extended top sheet 2 and the back sheet 3 are joined and fixed to form an end seal portion 7. Has been.

  The leak-proof walls 5 are disposed on the left and right sides of the absorber 4. The leak-proof wall 5 is composed of a single belt-like sheet 5a and a plurality of elastic members 5b (see FIG. 2). A part of the fixed end of the leak-proof wall 5 is joined to the surface sheet 2, and a part thereof stands up from the base part of the wing 6 at a position slightly outside the side edge of the absorber 4. The leak-proof wall 5 in this embodiment has a shape having a hollow portion 5c. The leak-proof wall 5 is easily raised from the back sheet 3 by having the hollow portion 5c. In addition, as the leak-proof wall 5, it is good also as a (Sigma) type | mold and T type | mold which are the shapes provided with the base wall part. A non-woven fabric can be used as the belt-like sheet 5a.

  The elastic member 5b is fixed in an extended state in the belt-like sheet 5a constituting the leak-proof wall 5. As the fixing means, a heat seal, a hot melt adhesive, or the like can be used. The elastic member 5b is not particularly limited as long as it is used for absorbent articles such as polyolefin and polyurethane foams and natural rubber. The shape of the elastic member 5b can be a thread, a band, a film, or the like. In this embodiment, a thread having a thickness of 470 dtex is used.

  Six or more elastic members 5 b are arranged on one side of the absorber 4. The expansion rate of each elastic member 5b is substantially the same, and in this embodiment, it is expanded by 1.4 times or more. The elongation rate is constant regardless of the shape of the leak-proof wall 5.

  On the side of the surface sheet 2 of the napkin 1, leakage prevention grooves 8 and 8 extending in the longitudinal direction of the napkin 1 are formed on both sides thereof. Each leak-proof groove 8 and 8 is formed when the surface sheet 2 and the absorber 4 are consolidated and integrated by performing pressing means such as embossing from the surface sheet 2 side. Each leakage prevention wall 5 is located outside each leakage prevention groove 8. Each leak-proof groove 8 has a substantially symmetric shape with respect to the longitudinal center line of the napkin 1. The leakage prevention grooves 8 are connected to each other at their front and rear ends, thereby forming a closed shape as a whole.

  In each leak-proof groove 8, a portion located at the excretory part facing part B (skin contact part) is a central curved part 8 a that is curved in a convex shape outward in the width direction of the napkin 1. The central curved portion 8a bulges outward in the width direction on both sides in the width direction of the skin contact portion B. The front and rear of the central curved portion 8a extend in the longitudinal direction of the napkin 1 to form a front groove 8b and a rear groove 8c, respectively. The central curved portion 8 a and the leakage preventing groove 8 including the front groove 8 b and the rear groove 8 c extending from the front and rear thereof extend substantially over the entire length of the napkin 1. Further, a rear groove 8d extending further to the rear portion in the longitudinal direction is formed from the rear groove 8c. The rear groove 8d is U-shaped and cuts the first rear part C and the second rear part D vertically. The front groove 8b and the rear groove 8d are curved in a convex shape toward the outer side in the width direction of the napkin 1, similarly to the central curved groove 8a.

  In this embodiment, the region 9 indicated by the alternate long and short dash line in the length direction outside of the central curved groove 8a on the outer side in the width direction of the central curved portion (skin contact portion) 8a and not on the bent portion 21 in the longitudinal direction is a compressed portion. 15 is provided. The compression site | part 15 is consolidated by giving pressing means, such as embossing, on the absorber 4, and is a site | part with high rigidity. By forming the compression site | part 15 in the area | region 9, the shape collapse of the excretion part opposing part B by the high contraction force of the leak-proof wall 5 extended | stretched with high magnification can be prevented. In addition to this, it is possible to maintain the ease of mountain folding with the central curved groove 8a as the starting point of bending. As a result, the absorption surface, that is, the surface on the side of the topsheet 2 is stably raised and can adhere to the wearer's body. Thereby, the side leakage of blood can be reliably prevented.

  By forming such a compression portion 15, it is not necessary to further provide a leak-proof groove on the outer side in the width direction of the central curved groove 8 a, and the area hardened by the two leak-proof grooves does not increase and is used. Sometimes the wearer does not feel uncomfortable. Further, in the sanitary napkin, a leak-proof groove 8 (hinge) is formed by embossing in order to join the absorbent body 4 after the surface sheet 2 and the leak-proof wall 5 are integrated at the time of manufacture. If the distance between the groove 8 and the leak-proof wall 5 is small, the leak-proof wall 5 may be caught and embossed. For this reason, the distance between the leak-proof groove 8 and the leak-proof wall 5 is required to be at least about 5 mm. The width of the absorbent body 4 between the leak-proof walls 5 and 5 is designed to be 55 to 65 mm in consideration of misalignment at the time of wearing in order to cover a general female crotch width of 35 to 45 mm. As described above, when a leak-proof groove is further provided on the outer side in the width direction of the central curved groove 8a, the distance between the central curved grooves 8a is so narrow that a large absorbing surface cannot be secured. On the other hand, in the compression site | part 15 of this embodiment, since the absorber 4 is densified by pressing means, such as embossing, the fitting property of the napkin 1 increases without feeling uncomfortable, and, thereby, a leak-proof effect Will further increase. In particular, the raised portion of the absorbent body 4 is surrounded by the closed leak-proof groove 8, so that the stability of the surface shape is further enhanced.

In order to raise the absorption surface more stably, it is effective to increase the basis weight (weight per unit area) of the absorbent body 4 positioned between the leak-proof grooves 8 and 8. In this case, if the basis weight of the absorbent body 4 positioned between the leak-proof grooves 8 and 8 is 300 to 1500 g / m ² , particularly 500 to 1200 g / m ² , it is possible to further increase the absorption surface more stably. It becomes. The basis weight within this range is also advantageous in that the napkin 1 can be easily pushed up to the body side with the central curved groove 8a as the starting point of bending by the pressure applied from the side of the napkin 1. In addition, in the range of 300-900 g / m < ² > among the ranges of basic weight, the effect used as the starting point of bending is main, and in the range of 900-1500 g / m < ² >, in addition to the effect used as the starting point of bending. As a result, the middle and high portions are slightly deformed into a drum shape, and the effect that the bulge is likely to occur is also produced.

The basis weight of the absorbent body 4 positioned between the leak-proof grooves 8 and 8 is as described above, but the basis weight of the absorbent body 4 positioned outside the leak-proof groove 8 is 100 to 400 g / m ² , particularly 150 to 300 g. / M ² is good. By setting the outer portion of the leak-proof groove 8 in the absorbent body 4 within this range, even if it is crushed, there is no sense of incongruity in hardness at the time of use. It is preferable from the point that the napkin 1 can be easily pushed up to the body side, starting from the point where it is raised and the central curved groove 8a as the starting point of bending.

  In the region 9, it is preferable that the Gurley stiffness value is 1000 to 2000 mg, particularly 1200 to 1800 mg from the standpoint of maintaining the stiffness of the napkin 1 without feeling uncomfortable during use. Since the weight of the absorbent body 4 positioned between the leak-proof grooves 8 and 8 is high in a portion that has not been compacted by pressing means such as embossing, the Gurley is also considered in consideration of the usability to the extent that the napkin 1 does not get damaged during use. The rigidity value is preferably 150 to 800 mg, particularly 300 to 500 mg.

  Furthermore, from the same viewpoint, the central curved groove 8a existing in the excretory part facing part B is preferably 50 to 120 mm in length and particularly 70 to 100 mm in the longitudinal direction. The rear groove 8c and the rear groove 8d existing in the first rear part C are 50 to 120 mm, in particular, in order to fit the anus part from the perineum, which tends to cause oblique back leakage by starting to change the curvature of the body, 70-100 mm is preferable. The front groove 8b present in the front part A and the rear groove 8d present in the second rear part D are preferably 20 to 70 mm in length and particularly 30 to 50 mm in the longitudinal direction.

  As described above, the napkin 1 can be kept standing without being affected by the contraction force of the leak-proof wall 5 extended at a high magnification while maintaining the fit in the surface shape. Hereinafter, the individual packaging structure of the napkin 1 will be described.

  As shown in FIG. 3, the napkin 1 is bent by being folded three times in the longitudinal direction together with the packaging sheet 10. The packaging sheet 10 is not particularly limited as long as it is used for a normal absorbent article such as a nonwoven fabric or a film, but is preferably a release sheet.

  When the napkin 1 is folded, the region E is formed by folding the second rear portion D so as to overlap the first rear portion C from the bent portion 23 in the state of FIG. (B)). Next, the region E is folded so that the region E overlaps the excretory part facing part B with the bent part 22 as a starting point to form a region F (FIG. 3C). Thereafter, the individual package 12 shown in FIG. 3D is formed by folding the folded portion 21 as a starting point. At the time of this folding, since the region 9 does not cover the bent portion 22 as described above, the bent portion 22 has only one leakage prevention groove 8 on each of the left and right sides. For this reason, the rigidity of the napkin 1 is also low and it becomes easier to fold. The front and rear fixed part and the excretory part facing part (region 9) of the leak-proof wall 5 are indispensable to increase the rigidity by compressing the absorbent body 4 by pressing means such as embossing in order to ensure the standing property. 4, the folded portion 21 and the folded portion 22 of the excretory portion facing portion B, which are higher than the weight of the front portion A of the second rear portion D, are difficult to fold the napkin 1 when they are consolidated by pressing means such as embossing. Therefore, it is desirable to remove it. The front part A overlaps with the region F to form the individual packaging structure shown in FIG. In addition, the area | region where the expansion-contraction force of the elastic member 5b is acting is not prescribed | regulated from the bending part 21, the bending part 22, the bending part 23, and the longitudinal direction front end part of the napkin 1 to a rear-end part.

  In such an embodiment, since the region 9 between the leak-proof wall 5 and the leak-proof groove 8 is provided with the compression portion 15 having higher rigidity than the region including the excretory part facing part B of the pair of leak-proof grooves 8, It becomes difficult to be crushed by body pressure during use, and the standing property of the leak-proof wall 5 is improved, so that it is possible to reliably prevent blood leakage.

  Further, the inside of the central bending portion 8a with low rigidity receives a force from the outside such as body pressure, so that the central bending portion 8a is bent from the central bending portion 8a as a starting point and is closely attached to the body, while the central bending portion with high rigidity is provided. The compression part 15 on the outer side of 8a is unlikely to receive a force from the outside. And since the leak-proof wall 5 is not crushed even after opening, the high contraction force of the elastic member 5b makes it difficult to collapse due to body pressure or the like, and also improves the standing property. For this reason, the side leakage prevention effect can be strengthened.

It is a top view of the unfolded state which shows one Embodiment of this invention. It is the MM sectional view taken on the line of FIG. It is a top view which shows the procedure of individual packaging.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sanitary napkin 2 Top sheet 3 Back sheet 4 Absorber 5 Leak-proof wall 8 Leak-proof groove 15 Compression site A Front part B Excretion part opposing part C 1st back part D 2nd back part

Claims (3)

It consists of a body fluid-permeable top sheet, a body fluid-impermeable back sheet, and an absorbent body interposed between the top sheet and the back sheet, along the longitudinal direction on both sides in the width direction of the absorbent body An absorbent article comprising a pair of leak-proof walls provided, and a leak-proof groove provided on both sides of the skin contact portion of the absorber on the pair of leak-proof walls,
The leak-proof groove has a portion that protrudes in an arc shape toward the outside in the width direction at both sides in the width direction of the skin contact portion,
The bent portion in the central portion of the absorbent article and the absorber when folded and individually packaged in the longitudinal direction in the region between the leak-proof wall and the leak-proof groove in the absorbent body In the region between the front end of the compression portion is provided with a higher rigidity than the region including the skin contact portion of at least a pair of leak-proof grooves,
The said compression site | part is provided in the width direction outer side of the part which protrudes in the said arc shape of the said leak-proof groove, without being provided in the part which protrudes in the said arc shape of the said leak-proof groove, The absorbent article characterized by the above-mentioned. . The absorbent article according to claim 1,
The said compression site | part is the embossed part which carried out the compression formation of the said absorber by embossing, The absorbent article characterized by the above-mentioned. The absorbent article according to claim 1 or 2,
The leakage barrier has a fixed end joined to the top sheet,
The said fixed end is provided in the area | region in which the said compression site | part was provided, The absorbent article characterized by the above-mentioned .

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