JP2010057526A - Absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorbent article which prevents leakage of menstrual blood or the like by increasing absorbing amount of an elevated part of the absorbent article rising on a use surface side at a middle in the width direction of the absorbent article. <P>SOLUTION: The absorbent article 1 includes a liquid-permeable surface sheet 3, a rear sheet 2, and an absorbent body 4 interposed between them. The absorbent article 1 has the elevated part N rising on the use surface side at the middle in its width direction and extending in a range at least from a blood discharge part H to the coccyx part T. The elevated part N is made of an upper absorbent body 4A arranged between the surface sheet 3 and the absorbent body 4 and a body liquid transferring sheet 6 arranged below the upper absorbent body. The upper absorbent body 4A has a plurality of embossed structures 7 formed by embossing the upper absorbent body from the surface sheet 3 side. The density of the body liquid transferring sheet 6 is higher than that of compressed parts 9a of the embossed structures 7 of the upper absorbent body 4A. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to absorbent articles such as sanitary napkins, panty liners, and incontinence pads for absorbing menstrual blood and vaginal discharge, and more specifically, an absorbent is provided between a liquid-permeable top sheet and a back sheet. In an absorbent article having an intermediate and high portion raised on the use surface side at least in the range from the blood drainage portion to the rupture portion at the center in the width direction, leakage was prevented by increasing the amount of absorption of the middle and high portions. The present invention relates to an absorbent article.

  Conventionally, as absorbent articles such as sanitary napkins, panty liners, incontinence pads, liquid-permeable back sheets such as polyethylene sheets or polyethylene laminate sheets nonwoven fabric, and liquid-permeable materials such as nonwoven fabrics or liquid-permeable plastic sheets. A thing in which an absorber made of cotton-like pulp or the like is interposed between the top sheet and the top sheet is known.

  In this type of absorbent article, for the purpose of preventing the excreted body fluid from causing a post-leakage through the groove of the ruptured part, the absorbent article is at least the central part in the width direction, and at least a blood drainage The thing provided with the upper layer absorber which rose to the use surface side in the range applied from the part to the crack part is marketed. In an absorbent article provided with such an upper layer absorbent body, various means are taken in order to fit the groove of the cracked portion.

  For example, in the following Patent Document 1, in an absorbent article comprising an upper layer absorbent and a lower layer absorbent excreted on the non-skin contact surface side of the upper layer absorbent, the upper layer absorbent is the lower layer absorbent. Disclosed is an absorbent article that is independently formed and disposed in a substantially non-contact state with the lower-layer absorber and is covered with a surface sheet so that the phase of the lower-layer absorber can be changed in the width direction. ing.

Moreover, in the following patent document 2, a longitudinally long main body part and a three-dimensional part provided on the skin side surface of the main body part and extending along the central axis in the vertical direction are provided. An absorbent article in which a flexible portion is formed by partially lowering a region located below the three-dimensional portion is disclosed.
JP 10-33589 A JP 2007-89818 A

  However, in the absorbent article described in Patent Document 1, since the upper absorbent body is formed independently of the lower absorbent body, menstrual blood or the like absorbed by the upper absorbent body is difficult to transfer to the lower absorbent body, There is a limit to the amount of absorption of the absorber. Further, in the absorbent article described in Patent Document 2, since the three-dimensional part does not actively absorb menstrual blood or the like, menstrual blood or the like may leak laterally from the groove of the cracked part.

  Even if the upper layer absorbent body (three-dimensional part) can be fitted to the groove of the cracked part, if the absorption capacity of the upper layer absorbent body is small, side leakage such as menstrual blood will occur.

  Then, the main subject of this invention is providing the absorbent article which prevented the leakage of menstrual blood etc. by increasing the amount of absorption of the middle-high part which protruded to the use surface side in the width direction center part of the absorbent article. .

In order to solve the above-mentioned problem, as the present invention according to claim 1, at least from the blood drainage part to the rupture part at the center part in the width direction in which the absorbent body is interposed between the liquid-permeable top sheet and the back sheet. In the absorbent article in which the middle and high portions raised on the use surface side over the entire range are formed,
The middle and high portions are constituted by an upper layer absorber disposed between the top sheet and the absorber, and a body fluid transmission sheet disposed on the lower surface side of the upper layer absorber,
Numerous embossing is given to the upper layer absorber from the top sheet side,
The absorbent article is characterized in that the bodily fluid transfer sheet has a higher density than the density of the compressed portion of the upper absorbent body by the embossing.

  In the first aspect of the present invention, since the upper layer absorbent constituting the middle and high parts is provided with a large number of embosses from the surface sheet side, the surface area of the middle and high parts is increased and the amount of absorbed menstrual blood and the like is increased. Will be able to. Further, the embossed recesses are compressed to a high density, whereby a density gradient is generated in the upper layer absorber, and menstrual blood or the like absorbed by the upper layer absorber is easily diffused downward by the capillary phenomenon due to the density gradient.

  Furthermore, since the bodily fluid transfer sheet has a higher density than the density of the compressed portion of the upper absorbent body due to the embossing, menstrual blood or the like that has entered the embossed portion is quickly absorbed by the upper absorbent body. , Due to the capillary phenomenon and surface tension accompanying the density gradient with the body fluid transmission sheet, it quickly moves to the body fluid transmission sheet, and after that, the absorption capacity is absorbed and held by a much larger absorber than the upper layer absorber . This apparently increases the amount of absorption from the middle and high parts, so that leakage of menstrual blood or the like can be prevented.

  As the present invention according to claim 2, the upper layer absorbent body is formed in a substantially arcuate bulge shape in a cross-sectional view in the width direction, the body fluid transmission sheet is disposed therein, and the embossing is The absorbent article according to claim 1, which is provided over the entire surface of the upper-layer absorbent body.

  In the second aspect of the invention, the upper layer absorbent body is formed in a substantially arc-shaped bulged shape in a cross-sectional view in the width direction, the body fluid transmission sheet is disposed therein, and the emboss is provided in the It is applied to the entire surface of the upper absorber. The middle and high portions are substantially arc-shaped, making it easier to fit into the groove of the cracked portion, and allowing menstrual blood and the like to be evenly absorbed from the entire surface of the middle and high portions, increasing the amount of absorption of the middle and high portions. .

  The absorbent article according to any one of claims 1 and 2, wherein the body fluid transmission sheet is folded in a substantially C shape or a bellows shape in a cross-sectional view in the width direction. Is provided.

  In the invention of claim 3, the body fluid transmission sheet is folded in a substantially C shape or bellows shape in a cross-sectional view in the width direction, thereby providing cushioning properties to the upper absorbent body. This makes it easier to fit the part into the groove of the cracked part.

  As the present invention according to claim 4, there is provided the absorbent article according to any one of claims 1 to 3, wherein the upper layer absorbent body is composed of an airlaid pulp nonwoven fabric.

  In the invention according to the fourth aspect, the upper layer absorbent body is made of an airlaid pulp nonwoven fabric, so that it is easy to form a concave portion by embossing, and the cushioning properties of the middle and high portions are increased.

  As this invention which concerns on Claim 5, the absorbent article in any one of Claims 1-4 with which the chemical fiber is mixed with the said upper layer absorber is provided.

  In the invention according to the fifth aspect of the present invention, it is easy to form embossed irregularities by heat fusion by mixing chemical fibers with the upper absorbent body.

  As for this invention which concerns on Claim 6, the shape of each embossing given to the said upper layer absorber is made into the shape which lengthened the direction of the longitudinal direction rather than the width direction dimension of the said absorbent article. An absorbent article as described in 1 above is provided.

  In the invention described in claim 6 above, menstrual blood or the like is absorbed by making the shape of each emboss applied to the upper absorbent body longer than the widthwise dimension of the absorbent article. It becomes easy to diffuse in the longitudinal direction of a property article, and it becomes possible to reduce side leakage.

  As the present invention according to claim 7, the middle-high portion is formed so as to narrow in the width direction from the blood drainage portion toward the rear side of the rupture portion in a plan view. An absorbent article is provided.

  In the invention of claim 7, the middle and high portions are formed so as to narrow in the width direction from the blood drainage portion toward the rear side of the rupture portion in plan view, thereby fitting the middle and high portions to the body. And leakage of menstrual blood or the like can be prevented.

  As described in detail above, according to the present invention, leakage of menstrual blood or the like can be prevented by increasing the amount of absorption at the middle and high portions raised on the use surface side at the center in the width direction of the absorbent article.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a partially broken development view of a sanitary napkin 1 according to the present invention, and FIG. 2 is a view taken along the line II-II in FIG.

  The sanitary napkin 1 is mainly used for applications such as panty liners, sanitary napkins, cage sheets, incontinence pads, etc. For example, as shown in FIG. The absorbent body 4 or the absorbent body 4 surrounded by the crepe paper 5 is interposed between the liquid-permeable surface sheet 3 and the center of the sanitary napkin 1 in the width direction, as shown in FIG. A middle-high part N is formed in the part over the range from at least the blood drainage part H to the caudal part to the caudal bone part T.

  The middle-high portion N is arranged between the top sheet 3 and the absorber 4 (lower layer side absorber), the upper layer absorber 4A or the upper layer absorber 4A surrounded by the crepe paper 5A as shown in the figure. And a bodily fluid transmission sheet 6 disposed on the lower surface thereof, the upper absorbent body 4A is provided with a large number of embosses from the top sheet 3 side, and the bodily fluid transmission sheet 6 is provided with the embossing. The density is higher than the density of the compressed portion of the upper-layer absorbent body 4A.

  This will be described in more detail below.

  As the back sheet 2, a sheet material having at least water shielding properties such as polyethylene and polypropylene is used, but in addition to this, a non-woven sheet (in this case) is obtained after substantially ensuring liquid impermeability through a waterproof film. Can form a back sheet with a waterproof film and a nonwoven fabric. In recent years, those having moisture permeability tend to be suitably used from the viewpoint of preventing stuffiness. The water- and moisture-permeable sheet material is a microporous material obtained by melting and kneading an inorganic filler in an olefin-based resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. A sheet is preferably used.

  As the surface sheet 3, a perforated or non-porous nonwoven fabric or a porous plastic sheet is preferably used. Examples of the material fibers constituting the nonwoven fabric include synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a lace method, a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Of these processing methods, the spunlace method is excellent in terms of flexibility and the spunbond method is excellent in drapeability, and the thermal bond method and the air-through method are excellent in terms of being bulky and soft.

  The absorbent body 4 interposed between the back sheet 2 and the top sheet 3 is, for example, a mixture of a superabsorbent resin in pulp or a mixture of chemical fibers in the pulp and a superabsorbent resin. Used. As shown in the figure, it is desirable that the absorbent body 4 is surrounded by crepe paper 5 in order to maintain its shape and quickly diffuse menstrual blood and prevent reverse return of menstrual blood once absorbed. Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as molten pulp, and artificial cellulose fibers such as rayon and acetate. Softwood pulp having a longer fiber length than hardwood pulp functions and It is preferably used in terms of price.

  Examples of the superabsorbent resin include cross-linked polyacrylate, self-crosslinked polyacrylate, saponified acrylate-vinyl acetate copolymer cross-linked, isobutylene / maleic anhydride copolymer cross-linked, Examples include cross-linked polysulfonates, and partially cross-linked water-swellable polymers such as polyethylene oxide and polyacrylamide. Among these, those based on acrylic acid or acrylate that are excellent in water absorption and water absorption speed are preferred. In the production process of the highly water-absorbent resin having the water absorption performance, the water absorption force and the water absorption speed can be adjusted by adjusting the crosslinking density and the crosslinking density gradient. The content of the superabsorbent resin is preferably 10 to 60%. When the content of the superabsorbent resin is less than 10%, sufficient absorbability cannot be provided, and when it exceeds 60%, the entanglement between the pulp fibers disappears, the sheet strength decreases, and tears, cracks, etc. Is likely to occur.

  The upper layer absorbent body 4A can be made of the same material as the absorbent body 4, but the upper layer absorbent body 4A is provided with embossing as will be described in detail later. It is preferable to use a bulky material so that is easily formed. In order to obtain a bulky upper layer absorbent body 4A, the upper layer absorbent body 4A is preferably composed of an airlaid pulp nonwoven fabric. Moreover, it is preferable to form the embossed side (surface sheet 3 side) of the upper layer absorbent body 4A to be relatively bulky from the opposite side (back surface sheet 2 side) because embossed irregularities are easily formed on the surface sheet 3 side. Moreover, it is preferable to mix a chemical fiber with the said upper layer absorber 4A. Since chemical fibers are easier to heat-seal than pulp, embossed irregularities are more reliably formed more reliably by mixing chemical fibers. Here, it is preferable that a relatively large amount of the chemical fiber is mixed on the emboss addition side (surface sheet 3 side).

  Examples of the body fluid transfer sheet 6 include those having hydrophilicity in the material itself by using regenerated fibers such as rayon and cupra, and natural fibers such as cotton, olefins such as polyethylene or polypropylene, polyesters, polyamides, and the like. A synthetic fiber that has been surface treated with a hydrophilizing agent to impart hydrophilicity can be used. In addition, in order to maintain hydrophilicity stably even after menstrual blood is excreted several times during use, synthetic fibers such as polyethylene or polypropylene, such as olefins, polyesters, polyamides, etc., are known durable hydrophilizing agents. It is desirable to make the nonwoven fabric surface-treated by imparting durable hydrophilicity.

  The body fluid transmission sheet 6 is disposed below the upper layer absorbent body 4 </ b> A and between the absorbent body 4.

  In the upper layer absorbent body 4A, as shown in the enlarged sectional view of FIG. 3, a large number of embosses 7, 7,... As a result, convex portions 8, 8... And concave portions 9, 9... Are alternately formed adjacent to each other in the width direction in the upper layer absorbent body 4A, and the high density region 9a having a relatively high fiber density due to the concave portions 9. Will be formed.

  By providing the embosses 7, 7,..., The surface area of the middle and high portions N increases, so that the amount of absorption of menstrual blood or the like increases. Further, as shown in FIG. 3, the body fluid or the like absorbed by the upper layer absorbent body 4 </ b> A from the convex portions 8, 8... Is downward due to the density gradient of the upper layer absorbent body 4 </ b> A generated by the embosses 7, 7. It becomes easy to diffuse.

  On the other hand, the bodily fluid transfer sheet 6 has a higher density than the high-density region 9a formed in the upper absorbent body 4A by the emboss 7. Therefore, as shown in FIG. 3, menstrual blood or the like that has entered the recess 9 of the upper absorbent body 4A by the emboss 7 is absorbed by the upper absorbent body 4A and then the body fluid transmission sheet 6 disposed below the upper body absorbent 4A. Due to the capillary phenomenon and surface tension associated with the density gradient, the body fluid transfer sheet 6 is quickly transferred to and absorbed and held by the lower absorbent body 4. As described above, menstrual blood or the like permeating the upper absorbent body 4A from the middle-high part N is also absorbed and retained by the upper absorbent body 4A, but most of the body fluid transfer sheet is caused by capillary action and surface tension associated with the density gradient. 6, the absorption capacity of the upper absorbent body 4A is apparently increased and the leakage of menstrual blood or the like can be prevented.

  By the way, although the said embossing 7,7 ... can be provided by a well-known embossing means, it is preferable to set it as especially heat-fusion embossing. In order to perform the heat fusion embossing, the surface sheet 3 is laminated on the surface side of the upper layer absorbent body 4A, and the surface sheet 3 is compressed by the convex portion of the embossing device from the surface side. The embossed bottom surface is heat-sealed by a heat-sealed portion formed by heat melting or ultrasonic waves provided at the tip to form embosses 7, 7,.

As shown in FIG. 4, each emboss 7 is formed such that the longitudinal dimension is longer than the width dimension of the sanitary napkin 1. That is, the length E _L of each emboss 7 in the napkin longitudinal direction is longer than the width E _{B in} the napkin width direction so that E _L > E _B is satisfied. As a result, menstrual blood or the like traveling on the surface of the middle and high portion N easily enters the emboss 7, and menstrual blood or the like that has entered the emboss 7 diffuses in the front-rear direction of the napkin. Can be reduced.

For example, as shown in FIG. 4, the embossed pattern of the emboss 7 includes a linear shape in which concave portions by embossing are arranged in parallel (FIG. (A)), an intermittent linear shape in which staggered arrangement is provided ((B) in FIG. 4), and an ellipse. A plurality of connected ellipses (FIG. (C)) or an intermittent ellipse in which the ellipses are staggered (FIG. (D)). In any emboss pattern, the above-mentioned relationship of E _L > E _B is maintained.

  The upper layer absorbent body 4A may be formed in a substantially planar shape with respect to the cross section in the width direction, but as shown in FIG. 2, it may be formed in a substantially arcuate bulge shape in the cross section in the width direction. preferable. By adopting such a bulging shape, the middle-high portion N can easily fit into the groove of the cracked portion, and menstrual blood or the like can be absorbed from the entire surface of the middle-high portion N. Here, in order to make the upper layer absorbent body 4A more easily absorb menstrual blood and the like, as shown in FIG. 2, the wall thickness thereof is relatively thick on the top side and gradually thinner on both sides. You may form so that it may become. At this time, the emboss 7 may be formed relatively deep on the top side and shallow on both sides.

  When the upper layer absorbent body 4A is formed in a substantially arcuate bulging shape, the body fluid transmission sheet 6 is preferably disposed inside the upper layer absorbent body 4A.

  Here, as shown in FIG. 5, the body fluid transmission sheet 6 is folded in a substantially C shape (same figure (A)) or bellows shape (same figure (B)) in a cross-sectional view in the width direction. It is preferable to do. By disposing in this way, cushioning properties can be imparted to the upper layer absorbent body 4A, and the middle and high portions N can be easily fitted into the groove of the cracked portion.

  By the way, as shown in FIG. 1, in order to fit the middle-high part N to the body, the middle-high part N is formed so as to narrow in the width direction from the blood drainage part H toward the tail bone part T in plan view. It is preferable to do. In the illustrated example, the middle-high portion N is formed in a substantially triangular shape that gradually narrows linearly in the width direction from the blood drainage portion H toward the tail bone portion T in a plan view, but instead is formed in a substantially trapezoidal shape. Alternatively, it may be formed so as to be gradually narrowed in a curve, or may be formed so as to be narrowed stepwise.

  Next, a method for forming the middle and high portions N will be described. First, the surface sheet 3 is laminated on the surface of the upper layer absorbent body 4A, and the embosses 7, 7... Are applied in a predetermined pattern. The bodily fluid transmission sheet 6 is disposed below the upper absorbent body 4A to which the embosses 7, 7... Are provided, and is disposed in a state of being raised on the use surface side at the center in the width direction of the absorbent body 4. After that, as shown in FIG. 6, the middle and high portions N are formed by being fixed to the absorbent body 4 by applying the fit emboss 10 from the top surface sheet 3 to the periphery thereof.

1 is a partially broken development view of a sanitary napkin 1. FIG. It is the II-II arrow directional view. FIG. 3 is an enlarged view of a main part of FIG. 2. (A)-(D) are top views of an emboss pattern example. (A), (B) is the principal part enlarged view of FIG. 2 which shows the example of arrangement | positioning form of the bodily fluid transmission sheet | seat 6. FIG. It is the II-II arrow directional view of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Back sheet, 3 ... Top sheet, 4 ... Absorber, 4A ... Upper layer absorber, 5, 5A ... Crepe paper, 6 ... Body fluid transmission sheet, 7 ... Embossing, 8 ... Convex part, 9 ... concave part, H ... blood drainage part, T ... tail bone part, N ... middle and high part

Claims (7)

At the center in the width direction where the absorbent body is interposed between the liquid-permeable top sheet and the back sheet, a middle-high part is formed that protrudes toward the use surface over at least the range from the blood drainage part to the rupture part. In absorbent articles,
The middle and high portions are constituted by an upper layer absorber disposed between the top sheet and the absorber, and a body fluid transmission sheet disposed on the lower surface side of the upper layer absorber,
Numerous embossing is given to the upper layer absorber from the top sheet side,
The absorbent article according to claim 1, wherein the body fluid transmission sheet has a higher density than a density of a compressed portion of the upper-layer absorbent body due to the embossing.   The upper layer absorbent body is formed in a substantially arcuate bulge shape in a cross-sectional view in the width direction, the body fluid transmission sheet is disposed therein, and the embossing is provided over the entire surface of the upper layer absorbent body. The absorbent article according to claim 1.   The absorbent article according to any one of claims 1 and 2, wherein the bodily fluid transfer sheet is folded and arranged in a substantially C shape or a bellows shape in a cross-sectional view in the width direction.   The said upper layer absorber is an absorptive article in any one of Claims 1-3 comprised by the airlaid pulp nonwoven fabric.   The absorbent article according to any one of claims 1 to 4, wherein a chemical fiber is mixed in the upper layer absorbent body.   The absorbent article according to any one of claims 1 to 5, wherein a shape of each emboss applied to the upper layer absorbent body is a shape in which a dimension in a longitudinal direction is longer than a dimension in a width direction of the absorbent article.   The absorbent article according to any one of claims 1 to 6, wherein the middle and high parts are formed so as to narrow in the width direction from the blood drainage part toward the rear side of the rupture part in plan view.

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