JP4630802B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article having a body fluid absorbing function, and particularly to an absorbent article suitably used as a urine collecting pad.

  An absorbent article used as a urine absorbing pad is mainly formed from a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the top sheet and the back sheet. The The absorbent body is generally formed by mixing pulp and a highly water-absorbent resin. Pulp is excellent in the performance of instantly absorbing bodily fluids, while the superabsorbent resin is excellent in the performance of absorbing and retaining a large amount of bodily fluids.

  By the way, in the case of urge incontinence, a large amount of urine tends to be excreted vigorously from the urethra. On the other hand, in the case of light stress incontinence caused by sneezing or the like, urine is not excreted vigorously from the urethra and tends to move along the skin. For this reason, when the adhesion between the wearer's skin and the absorbent article is insufficient, the urine transmitted through the skin cannot be reliably absorbed by the absorbent body, and the urine moving through the skin is absorbed. There is a risk of leaking outside the product.

  Thus, an absorbent article used as a urine absorbing pad is required to absorb a large amount of urine quickly and reliably, and is also required to reliably capture a small amount of urine. The same applies to absorbent articles used as sanitary napkins.

In response to such a demand, for example, an absorbent article is disclosed in which a bulging means extending in the longitudinal direction is provided to bulge the surface on the side of receiving bodily fluid to improve adhesion to the skin ( Patent Document 1). In this case, the following means were used as the bulging means. That is, the bulging means is a bulge formed by a liquid permeable sheet or an absorbent sheet, and the bulge is fixed to the absorbent body with the top surface extending along the longitudinal direction of the absorbent article. A plurality of elastic members extending along both sides of the longitudinal center line of the absorbent article. It was. When an absorbent article having such a raised portion is mounted, the elastic member contracts, so that the raised portion rises due to the contraction stress, the raised portion comes into close contact with the wearer's skin, and a small amount of urine that is excreted. (See Patent Document 2).
Japanese Patent No. 3444229 JP 2002-320638 A

  However, in the above absorbent article, the upright portion that connects the top surface portion of the raised portion and the fixed portion is connected to the top surface portion in the vicinity of the longitudinal center line, and therefore, in the longitudinal direction near the longitudinal center line of the top surface portion. The degree of freedom was lower than near the side edge. For this reason, when the absorbent article is about to rise toward the wearer's skin when the absorbent article is mounted, the elastic member near the longitudinal center line of the top surface portion is likely to be inhibited from shrinkage stress. . As a result, the contraction stress in the elastic member located in the vicinity of the center line in the longitudinal direction of the top surface portion is smaller than the contraction stress in the elastic member in the vicinity of the longitudinal end, and the bulging means stands up in a Y-shape. The adhesion between the bulging bulge and the skin had been reduced. In such a case, there was a possibility that the body fluid may travel along the skin and leak to the outside of the absorbent article (see FIGS. 4 and 5).

  In view of such a problem, an object of the present invention is to provide an absorbent article having a raised portion on the surface, which can improve adhesion between the raised portion and the skin and prevent leakage of body fluid. To do.

  The inventors of the present invention have made extensive studies to solve the above problems. As a result, in an absorbent article having a raised portion, a liquid-permeable top sheet is placed over the raised portion, and this top sheet inhibits the contraction stress of the elastic member located near the longitudinal side end of the top surface portion. Thus, it was found that the adhesion between the skin of the wearer and the absorbent article can be improved, and the present invention has been completed. More specifically, the present invention provides the following.

  (1) An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body that is disposed between and absorbs and retains body fluid, Provided between the absorbent body and a bulging means provided so as to extend along the longitudinal center line of the absorbent article and bulging near the longitudinal center line of the top sheet, the bulging means, A liquid-permeable top surface portion provided with a plurality of elastic members extending along both sides of the longitudinal center line of the absorbent article and joined in the vicinity of the longitudinal center line of the top sheet, and the longitudinal center of the top surface portion A pair of standing parts extending downward from both sides of the wire and standing on the top sheet side by the contraction stress of the elastic member, and a pair of each standing part extending outward and fixed to the absorber And having a fixing part of In addition, the absorbent body, the top surface portion, and an internal space formed by being surrounded by the pair of upright portions and extending along the longitudinal center line of the absorbent article, the dimensions of the upright portions in the width direction are An absorbent article that is at least a distance from the top of the bulged top sheet to the absorber.

  In the absorbent article provided with the bulging means, the pair of standing parts rises due to the elastic contraction force when the plurality of elastic members contract, and the top sheet is bulged by pushing up the top surface part to the top sheet side. At this time, since the top surface portion is connected to the fixed portion through the upright portion in the vicinity of the longitudinal center line, the freedom in the vicinity of the longitudinal center line of the top surface portion is lower than that in the vicinity of the longitudinal side end, and the top surface portion. The elastic member in the vicinity of the center line in the longitudinal direction is more likely to inhibit the elastic contraction force than the elastic member in the vicinity of the end in the longitudinal direction. For this reason, it is more difficult to stand up near the longitudinal center line of the top surface portion than near the longitudinal direction end.

  In this respect, in the absorbent article (1), since the top surface of the upright portion and the top sheet are joined by a hot-melt adhesive or the like, the top surface portion is attached to the top sheet by the force of the upright portion to stand up. Pushed up. In the vicinity of the end in the longitudinal direction, which has a structure that makes it easier to stand up in the top surface than in the vicinity of the center line in the longitudinal direction, the dimension of the rising part is larger than the distance from the top of the top sheet to the absorber when the top sheet swells Since it is long, the top sheet bulges out completely before the upright portion stands up completely, so that the elastic contraction force of the elastic member is further inhibited. As a result, the elastic contraction force of the elastic member is made uniform near the longitudinal center line and the longitudinal side end of the top surface part, and the height rising between the longitudinal side end and the longitudinal center line of the top surface part is different. The contact between the wearer's skin and the top sheet is increased, and body fluid can be effectively captured.

  (2) The absorbent article according to (1), wherein a dimension of the upright portion in the width direction is 10 mm or more and 50 mm or less.

  According to the invention of (2), when the dimension of the standing part is specifically 10 mm or more and 50 mm or less, the effect of the invention described in (1) can be effectively exhibited.

  (3) Absorption as described in (1) or (2) provided with a pair of leak-proof means provided in the longitudinal direction both side edge part of the said top sheet so that it may extend along the said longitudinal direction, and stands on a wearer's skin side. Sex goods.

  According to the invention of (3), when the absorbent article is bent by the elastic contraction force of the elastic member provided in the bulging means, such as when the absorbent article is worn, the leakage prevention means stands on the wearer's skin side. The leak-proof means and the skin of the wearer are in close contact with each other. Here, the pocket part is formed by the skin side surface of the absorbent article and the leakage preventing means, so that even when a large amount of body fluid is excreted, the absorbent body absorbs the body fluid on the absorbent article. Body fluid is retained. Since the leakage preventing means is in close contact with the wearer's skin, body fluid can be prevented from leaking from the gap between the leakage preventing means and the skin of the absorbent article.

  According to the present invention, in the top surface portion of the bulging means, there is no difference in elastic contraction force between the elastic member located near the longitudinal center line of the top surface portion and the elastic member located near the longitudinal side end. There is no difference in the height of rising between the longitudinal centerline of the surface and the vicinity of the longitudinal side edge, and the adhesion between the top sheet swelled by the top surface and the wearer's skin is improved, so a small amount of body fluid is excreted. Can be absorbed efficiently.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<First embodiment>
[overall structure]
The perspective view of the absorbent article 1 which concerns on this embodiment is shown in FIG. Further, FIG. 3 shows a cross-sectional view of the absorbent article 1 in FIG. 1 taken along the line XX, and FIG. 2 shows a cross-sectional view of the absorbent article 1 in a state where the absorbent article 1 is not curved. As shown in FIG. 1 to FIG. 3, the absorbent article 1 according to the present embodiment absorbs bodily fluids disposed between a liquid-permeable top sheet 45, a liquid-impermeable back sheet 11, and these. And an absorbent body 12 to be held. A bulging means 26 is provided between the top sheet 45 and the absorbent body 12 so as to extend along the longitudinal center line O of the absorbent article 1 and bulges in the vicinity of the longitudinal center line O of the top sheet 45. I have. The top sheet 45 is provided with a pair of leak-proof means 42 provided on both side ends in the longitudinal direction so as to extend along the longitudinal direction and stand on the wearer's skin side.

  The absorbent article 1 is suitably used for elderly female incontinence patients. That is, the absorbent article 1 has a function of easily capturing a small amount of urine excreted due to stress incontinence and also capable of capturing and absorbing a large amount of urine excreted rapidly due to urgent incontinence. ing. As shown in FIG. 1, the absorbent article 1 has a longitudinal direction and a short direction, the length dimension in the longitudinal direction is about 300 to 500 mm, and the length dimension in the short direction is 100 to 200 mm. Degree. Moreover, the whole thickness is about 10-40 mm in the state mounted | worn between underwear and the body.

[Top sheet]
As the top sheet 45, a hydrophilic and liquid-permeable material is used. The top sheet 45 is preferably formed of only synthetic resin fibers that have been subjected to a hydrophilic treatment. Moreover, what does not contain water absorbing resins, such as natural fibers, such as a pulp which has a liquid holding | maintenance function, highly water absorbing resin, and polyvinyl alcohol (PVA), is used. As it can exhibit excellent liquid permeability function, which basis weight is formed by through-air nonwoven fabric ^10g / ^{m 2 ~40g} / m 2 is more preferable. The through-air nonwoven fabric is formed of a core-sheath type composite synthetic fiber having a core part made of polypropylene resin (PP) or polyethylene terephthalate resin (PET) and a sheath part made of polyethylene resin (PE), PET fiber, PP fiber, or the like. . Moreover, you may form with the resin film which has many liquid permeation holes. Furthermore, the embossed biting process may be used, or a concavo-convex shape may be used, or a nonwoven fabric containing elastic stretchable fibers such as polyurethane fibers may be used.

  Both longitudinal ends of the top sheet 45 are joined to the back sheet 11 by an adhesive or heat seal. Both end portions in the longitudinal direction of the top sheet 45 are joined to a leak-proof sheet 40 provided in a leak-proof means 42 described later by an adhesive or heat seal. Further, the vicinity of the center line O in the longitudinal direction of the top sheet 45 is joined to the top surface portion 21 provided in the bulging means 26 described later by an adhesive or heat seal. However, it is not limited to these joining methods.

[Absorber]
The absorbent body 12 is formed by mixing pulp fibers and a highly water-absorbent resin and wrapping them with hydrophilic tissue paper or the like. Content ratio of the superabsorbent polymer is about 20 wt% to 60 wt%, the total basis weight of the pulp fibers and superabsorbent polymer ^is a 500g / ^{m 2} ~2000g / m 2 approximately, to these numerical values It is not limited. The absorber 12 is disposed on the back sheet 11, and the back sheet 11 and the absorber 12 are bonded and fixed with a hot-melt adhesive or the like.

[Back sheet]
The back sheet 11 is preferably formed of a liquid-impermeable and non-breathable resin film. Specifically, a polyethylene resin film or the like is preferably used. However, it may be formed of a liquid-impermeable and breathable resin film. Note that a pressure-sensitive adhesive layer (not shown) for preventing slippage is provided on the outer surface of the back sheet 11. This pressure-sensitive adhesive layer is formed by applying a hot-melt adhesive such as rubber. Prior to use of the absorbent article 1, the surface of the pressure-sensitive adhesive layer is protected by a release sheet (not shown).

[Bulging means]
The swelling means 26 includes a plurality of first elastic members 25 extending along both sides of the longitudinal center line O of the absorbent article 1, and is a liquid fixed along the vicinity of the longitudinal center line O of the top sheet 45. It has a transparent top surface portion 21. The top surface portion 21 has a pair of upright portions 23 that extend downward from both lower ends of the center line O in the longitudinal direction and stand up toward the top sheet 45 by the elastic contraction force of the first elastic member 25. Each of the standing parts 23 extends outward and has a pair of fixing parts 22 fixed to the absorber 12. In addition, an internal space 24 that is formed by being surrounded by the absorbent body 12, the top surface portion 21, and the pair of upstanding portions 23 and extending along the longitudinal center line O of the absorbent article 1 is provided.

In the absorbent article 1 according to the present embodiment, the bulging means 26 is formed by a single liquid-permeable sheet 20. That is, the top surface portion 21, the standing portion 23, and the fixing portion 22 are all formed by the liquid permeable sheet 20. However, the top surface portion 21, the standing portion 23, and the fixing portion 22 may be formed of different sheet members and joined. Moreover, what does not contain water-absorbing resin, such as natural fiber, such as a pulp, a highly water-absorbing resin, and polyvinyl alcohol (PVA), which has a liquid retention function is used. As it can exhibit excellent liquid permeability function, having a basis weight is through-air nonwoven fabric in the range of ^10g / ^{m 2 ~40g} / m 2 is preferably used. The through-air nonwoven fabric is formed of a core-sheath type composite synthetic fiber having a core part made of polypropylene resin (PP) or polyethylene terephthalate resin (PET) and a sheath part made of polyethylene resin (PE), PET resin fiber, PP resin fiber, or the like. The Furthermore, it can also be formed of pulp fiber, rayon fiber or the like.

  In the present embodiment, the width dimension W1 of the top surface portion 21 is about 25 to 40 mm. Furthermore, the dimension W2 of the standing part 23 is preferably 10 mm to 50 mm, and more preferably 20 mm to 40 mm. When the bulging means 26 is in a bulged state, the dimension of the standing portion 23 takes a value larger than the distance W3 from the top of the top sheet 45 to the absorber 12.

  The liquid permeable sheet 20 is a sheet having a constant length in the width direction and continuously extending in the longitudinal direction. Both ends in the longitudinal direction of the liquid permeable sheet 20 coincide with both ends in the longitudinal direction of the absorbent article 1. In the present embodiment, the liquid permeable sheet 20 and the absorbent body 12 form an internal space 24 that extends in the longitudinal direction. Moreover, although the fixing | fixed part 22 is directly joined to the surface of the absorber 12, the other hydrophilic sheet | seat etc. may interpose between the fixing | fixed part 22 and the surface of the absorber 12. FIG.

  In the present embodiment, on both sides of the longitudinal center line O of the absorbent article 1, the liquid-permeable sheet 20 that forms the top surface portion 21 is folded in half along the entire longitudinal direction. A first elastic member 25 is interposed between the liquid-permeable sheet 20 folded in half, and the liquid-permeable sheet 20 and the first elastic member 25 are fixed with a hot-melt adhesive. However, the 1st elastic member 25 is not provided over the whole longitudinal direction of the absorbent article 1, and is provided in a part of longitudinal direction. Four first elastic members 25 are provided on both sides of the longitudinal center line O, but the present invention is not limited to this. It is preferable that the first elastic member 25 is fixed to the liquid permeable sheet 20 in a state where the first elastic member 25 is extended 1.2 to 2 times in the longitudinal direction. The top surface is bonded and fixed to the top sheet with a hot melt adhesive. A contraction stress in the longitudinal direction acts on the top surface portion 21. More specifically, the top surface portion 21 is largely separated from the surface of the absorber 12 by the elastic contraction force of the first elastic member 25. And while the internal space 24 extended in a longitudinal direction is formed between the absorber 12, the top | upper surface part 21, and a pair of standing part 23, the force which curves the absorbent article 1 acts, and absorptivity. The article 1 is curved.

[Leakage prevention means]
The leakage preventing means 42 includes a plurality of second elastic members 41 extending along the longitudinal direction and the second elastic members 41, one side end in the longitudinal direction is a free end, and the other side end on the backsheet 11. A pair of liquid-impermeable leak-proof sheets 40 that are fixed.

  The pair of leak-proof sheets 40 is formed of a nonwoven fabric made of hydrophobic fibers. For example, point bond nonwoven fabrics, spunbond nonwoven fabrics, melt blown nonwoven fabrics, etc., which are formed of a core-sheath type composite synthetic fiber having a core part made of PP resin and a sheath part made of PE resin, among which liquid impervious ones are suitable. Used for.

  The ends in the longitudinal direction of the pair of leak-proof sheets 40 are joined to the ends in the longitudinal direction of the back sheet 11 by a hot melt adhesive or the like. Each leakproof sheet 40 includes a plurality of second elastic members 41 (5 to 8) extending in the longitudinal direction, but is not limited thereto. The second elastic member 41 is preferably joined to the leak-proof sheet 40 in a state of being stretched by about 1.2 to 1.8 times. Due to the elastic contraction force of the second elastic member 41 provided in the leak-proof sheet 40, a force is applied to the absorbent article 1 so that the top sheets 45 face each other. And the leak-proof sheet | seat 40 stands on the body side, and the leak-proof means 42 is formed.

[Function and effect]
The effect of the absorbent article 1 which concerns on this embodiment is demonstrated. The release sheet provided on the clothing side surface of the absorbent article 1 is peeled off, and the back sheet 11 is fixed to the inner surface of the undergarment via the pressure-sensitive adhesive layer. In the free state, the absorbent article 1 is in FIG. 1 due to the elastic contraction force of the second elastic member 41 attached to the leak-proof sheet 40 and the first elastic member 25 attached to the liquid-permeable sheet 20. As shown, the skin side surface is curved so as to be recessed in a concave shape.

  By the way, since the top surface portion 21 is connected to the fixing portion 22 through the upright portion 23 in the vicinity of the longitudinal center line O, the vicinity of the longitudinal center line O of the top surface portion 21 is more free than the vicinity of the longitudinal side end P. The first elastic member 25 in the vicinity of the longitudinal center line O of the top surface portion 21 has a low degree of elasticity, and the contraction stress is easily inhibited compared to the first elastic member 25 in the vicinity of the longitudinal side end P. For this reason, in the vicinity of the longitudinal center line O of the top surface portion 21, it becomes more difficult to stand up than in the vicinity of the longitudinal side end P.

  However, when the standing portion 23 tries to stand up due to the contraction stress of the first elastic member 25, the top surface portion 21 and the top sheet 45 are joined together, and thus stand together with the top sheet 45. In addition, since the dimension W2 of the standing portion 23 is longer than the distance W3 from the top of the top sheet 45 to the absorber when the top sheet 45 swells to the maximum, the top surface 21 has a longitudinal center line O in the vicinity thereof. The elastic contraction force of the first elastic member 25 is further inhibited in the vicinity of the longitudinal side end P having a structure that makes it easier to stand up. Thereby, the shrinkage stress of the first elastic member 25 is made uniform in the vicinity of the longitudinal center line O of the top surface portion 21 and in the vicinity of the longitudinal direction end P, and in the vicinity of the longitudinal side end P of the top surface portion 21 and the longitudinal center line O. There is no difference in the height to stand up.

  For this reason, in the wearing state, since the bulging means 26 rises in a T shape from the surface of the absorbent body 12, there is no space between the top surface portion 21 and the skin, and the top surface portion 21 tends to adhere to the urine excretion portion. . Furthermore, since the top surface part 21 has a certain degree of freedom with respect to the absorber 12, even if the absorber 12 moves with the underwear, it is easy to maintain the state where the top surface part 21 is in close contact with the urine excretion part.

  In light incontinence such as sneezing, which is called abdominal pressure incontinence, a small amount of urine is excreted from the urinary excretion part, and this urine tries to pass through the surface of the body, but from the urine excretion part to the crotch Since the top surface portion 21 is in close contact with the top sheet 45 via the top sheet 45, this urine is easily captured by the top sheet 45 and the top surface portion 21, and the urine is absorbed through the liquid permeable sheet 20. Easily absorbed.

  For example, when a relatively large amount of urine is excreted until going to the toilet, which is called urge incontinence, the urine passes through the top sheet 45, passes through the liquid permeable sheet 20, and is absorbed by the absorber 12. The Since the absorber 12 has pulp and a superabsorbent resin, urine is quickly absorbed by the pulp, and a large amount of urine is absorbed and retained by the superabsorbent resin.

  In urge incontinence, a large amount of urine is given, and the water absorption rate of the pulp cannot catch up, and urine may remain on the surface of the absorbent body 12. In this absorbent article 1, since the absorbent body 12 maintains the concave curved surface shape, this urine hardly flows back and forth, and as shown in FIG. 3, the top surface portion 21 and a pair of pairs are formed on the surface of the absorbent body 12. Since there is an internal space 24 sandwiched between the standing portions 23, urine is temporarily stored in the internal space 24. Since the surface of the absorber 12 is exposed in the internal space 24, urine in the internal space 24 is absorbed in a short time by the pulp in the absorber 12.

  Furthermore, particularly when a large amount of urine is excreted, the urine is stored on the surface of the absorbent body 12 maintaining the concave curved shape, and a pair of leak-proof means 42 exists on both sides thereof, The movement of the urine in the width direction can be prevented by the leakage preventing means 42, and side leakage can be prevented.

  Thus, the absorbent article 1 can easily prevent the urine from passing through the crotch of the body when a small amount of urine is excreted during abdominal pressure incontinence, and a large amount of urine can be excreted during urge incontinence. Even when it is done, it can be reliably absorbed by the absorber 12. Further, the top surface portion 21 and the top sheet 45 are formed of hydrophilic synthetic resin fibers and have a low liquid holding function, so that the state in which the top surface portion 21 and the top sheet 45 are wet with urine does not last for a long time. It can be prevented from getting wet, and problems such as crotch rash are unlikely to occur.

It is a perspective view of the absorptive article concerning the present invention. In the absorbent article which concerns on this invention, it is a figure which shows the outline of the cross section before a swelling means rises. In the absorbent article which concerns on this invention, it is a figure which shows the outline of the cross section after a swelling means rises. In the absorbent article of the prior art example which does not have a top sheet, it is a figure which shows the outline of the cross section after a swelling means stood | started up. In the absorbent article of the prior art example which has a top sheet, it is a figure which shows the outline of the cross section after a swelling means stood | started up.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Absorbent article 11 Back sheet 12 Absorber 20 Liquid permeable sheet 21 Top surface part 22 Fixing part 23 Standing part 24 Internal space 25 First elastic member 26 Swelling means 40 Leakproof sheet 41 Second elastic member 42 Leakage preventing means 45 Top sheet O Longitudinal center line P Longitudinal side end of top surface portion 21

Claims (3)

An absorbent article having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body that is disposed between and absorbs and retains body fluids,
Provided with a bulging means provided between the top sheet and the absorbent body so as to extend along the longitudinal center line of the absorbent article and bulges in the vicinity of the longitudinal center line of the top sheet;
The bulging means includes a plurality of elastic members extending along both sides of the longitudinal center line of the absorbent article, a liquid-permeable top surface portion joined near the longitudinal center line of the top sheet, and A pair of upright portions that extend downward from both lower sides of the longitudinal center line of the top surface portion and stand on the top sheet side by the contraction stress of the elastic member, and each of the upright portions extend outward and absorb the absorption. A pair of fixing portions fixed to the body, and an interior extending along a longitudinal center line of the absorbent article formed by being surrounded by the absorber, the top surface portion, and the pair of upright portions With space,
The interval along the short direction of the absorbent article in the pair of upright portions is wider on the fixed portion side than on the top surface portion side when the bulging means is in a bulged state. ,
The widthwise dimension of that in the upright portion is bulged absorbent article from the top is not less than the distance to reach the absorbent body of said topsheet.   The absorptive article according to claim 1 whose size of the width direction of said upright part is 10 mm or more and 50 mm or less. The absorbent article of Claim 1 or 2 provided with a pair of leak-proof means provided in the both-sides edge part of the longitudinal direction of the said top sheet so that it may extend along the said longitudinal direction, and stands on the wearer's skin side.

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