JP2009136349A - Absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorbent article with excellent absorbency and leakage preventive capability. <P>SOLUTION: The absorbent article 1 comprises a liquid-permeable front surface sheet 2, a rear surface sheet 3 and an absorber 4 disposed between the sheets, and is substantially formed vertically long. The front surface sheet 2 has a number of projections 21 which are formed long in the vertical direction in a center area 2c located at the center in the longitudinal direction of the absorbent article 1, and a number of projections 22 which are formed long in the cross direction of the absorbent article in end areas 2a and 2b located in the front and rear of the center area 2c. A number of the projections 21 and 22 in the center area 2c and end areas 2a and 2b are disposed in such a state as dispersed in the longitudinal direction and in the cross direction of the absorbent article 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an absorbent article.

As a surface sheet used for a disposable diaper, there is known a surface sheet formed with a convex portion extending continuously in a specific direction on a surface directed toward the wearer's skin.
For example, Patent Document 1 discloses a perforated hydrophobic surface sheet formed in a pleat shape so as to have a large number of peaks and valleys formed between adjacent peaks, and only the valleys of this surface sheet. The surface covering sheet of the absorbent product is described that includes a hydrophilic layer bonded to the lower surface of the surface sheet so as to contact the surface. Further, according to Patent Document 1, according to the surface covering sheet, the skin of the wearer is contacted only at the mountain portion, so that a dry and comfortable feeling is given, and the discharged liquid gathers in the valley portion and is a surface sheet. Since it moves to the hydrophilic layer which permeate | transmits the opening of this and is contacting the trough part, the effect that high absorbency is exhibited is described.

JP 2001-231815 A

However, since the surface covering sheet of Patent Document 1 is formed such that the mountain portion continuously extends in one direction, the mountain portion is crushed or broken due to a load when the absorbent article is worn. There is a problem that the effect of absorbing the liquid is lowered, such as preventing the liquid from being transferred to the hydrophilic layer in contact with the valleys. Furthermore, there is a risk of discomfort due to the crushing of the ridges and the remaining liquid at the broken part.
In addition, since the peak portion extends continuously in one direction, when a large amount of liquid is discharged at one time, the liquid may flow in the one direction, leading to leakage.

  Accordingly, an object of the present invention is to provide an absorbent article having excellent absorption performance and excellent leakage prevention performance.

  The present invention comprises a liquid permeable top sheet, a back sheet and an absorbent article disposed between both sheets, and the absorbent article formed substantially vertically, wherein the top sheet is an absorbent article. The central region located in the central portion in the longitudinal direction has many convex portions that are long in the longitudinal direction, and the convex portions that are long in the width direction of the absorbent article are located in the end regions located before and after the central region. The absorbent article has a large number of portions, and the plurality of convex portions in each of the central region and the end region are arranged in a state dispersed in the longitudinal direction and the width direction of the absorbent article. Thus, the object is achieved.

  The absorbent article of the present invention has excellent absorption performance and excellent leakage prevention performance.

Hereinafter, the present invention will be described based on preferred embodiments thereof.
FIG. 1 is a plan view showing a partially broken disposable diaper as a first embodiment of the absorbent article of the present invention, and FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
The diaper 1 of the first embodiment is disposed between a liquid-permeable top sheet 2, a liquid-impermeable or water-repellent back sheet 3, and both the sheets 2, 3, as shown in FIGS. The absorbent body 4 is provided. Moreover, the diaper 1 has the abdominal part A, the back part B, and the crotch part C located between these A and B in the longitudinal direction. The abdomen A is a part located on the wearer's abdomen when wearing the diaper, the back part B is a part located on the back of the wearer, and the crotch part C is a part located on the inseam of the wearer. . The crotch part C is located at the center in the longitudinal direction of the diaper 1.

  The diaper 1 of the present embodiment has an hourglass shape in which both side edges of the crotch part C are curved inwardly in an arc shape, and the central portion in the longitudinal direction is bound inward as a whole. Further, the top sheet 2 has a substantially rectangular plan view shape having an outer dimension larger than that of the absorber 4, and is arranged at the center in the width direction of the back sheet 3. The back sheet 3 has an hourglass-like outer shape that matches the outer shape of the diaper. The top sheet 2 and the back sheet 3 respectively extend outward from both longitudinal edge portions and both lateral edge portions of the absorbent body 4, and directly or other members are interposed in these extending portions. Are joined together.

The diaper 1 is a so-called unfolded diaper, which is provided with a pair of fastening tapes 5 and 5 on the left and right side edges of the back side B, and the fastening on the outer surface (non-skin contact surface) of the abdominal side A. A landing tape 6 for fixing the tapes 5 and 5 is provided.
A three-dimensional gather forming sheet 72 having an elastic member 71 is disposed on each side of the diaper 1 in the longitudinal direction so as to cover both sides of the top sheet 2, thereby forming a pair of three-dimensional gathers 7, 7. Has been. The three-dimensional gather forming sheet 72 is joined to the top sheet 2 at both side edges of the top sheet 2, thereby forming three-dimensional gather fixed ends 73, 73 extending in the longitudinal direction of the diaper 1. Yes.
In addition, a plurality of leg elastic members 81 for forming leg gathers are arranged substantially linearly on both side portions in the longitudinal direction of the diaper 1, and waist portions on the back side portion A and the ventral side portion B of the diaper 1. The belt-shaped waist elastic member 82 for forming waist gathers is arranged along the edge of the waist.

As shown in FIGS. 1 and 2, the surface sheet 2 in the diaper 1 has a large number of convex portions 21 that are long in the longitudinal direction in the central region 2 c located in the central portion in the longitudinal direction of the diaper 1. Each of the end regions 2a and 2b located before and after the central region 2c has a large number of convex portions 22 that are long in the width direction of the diaper 1.
In both the central region 2c and the two end regions 2a and 2b, the large number of convex portions 21 and 22 are not continuous concave and convex shapes as in the groove structure, but in the longitudinal direction and the width direction of the diaper 1. Arranged in a distributed state.
In the diaper 1 of the present embodiment, the central region 2c is disposed on the crotch C, one end region 2a is disposed on the ventral side A, and the other end region 2b is disposed on the dorsal side B. Has been.

As shown in FIG. 3, in the central region 2 c, a plurality of rows of convex portions R in which a plurality of convex portions 21 are arranged in series in the longitudinal direction (X direction) of the diaper 1 are formed in the width direction of the diaper 1. Yes. FIG. 3 shows five convex row R.
As shown in FIG. 4A, the convex portion 21 of the central region 2c has a substantially rectangular shape in plan view, the long side of the rectangle extends along the longitudinal direction of the diaper 1, and the short side is It extends along the width direction of the diaper 1. Moreover, the convex part 21 is hollow inside.

It is preferable that the convex part 21 in the center area | region 2c has the following dimensional ratios, arrangement | positioning, etc. from a viewpoint of preventing the horizontal leak of urine or a loose stool.
The ratio (L1 / L2) of the length L1 in the diaper longitudinal direction (X direction) and the length L2 in the diaper width direction (Y direction) of the convex portion 21 is preferably 1.0 to 5.0. More preferably, it is 1.2-3.0.
It is preferable that ratio (P1 / L1) of the pitch P1 of the convex part 21 of the diaper longitudinal direction (X direction) and the said length L1 is 1.0-3.0, More preferably, it is 1.0-2. 0.
The ratio (P2 / L2) between the pitch P2 of the convex row R and the length L2 in the diaper width direction (Y direction) is preferably 1.0 to 5.0, more preferably 1.0 to 3. .0.
The distance L3 between the protrusions 21 in each protrusion row R is preferably 0.0 to 10.0 mm, particularly preferably 1.0 to 5.0 mm. The interval L4 between the adjacent protrusions R and R is 1 0.0 to 10.0 mm, particularly 1.0 to 5.0 mm is preferable.
For the convex portions in the central region, the convex portions in the convex portion row R extending in the longitudinal direction of the absorbent article are also in series with no gap between adjacent convex portions (L3 = 0), These convex parts shall be arrange | positioned in the state disperse | distributed to the longitudinal direction of the absorbent article.

On the other hand, in each of the end regions 2 a and 2 b, a plurality of rows of convex portions R in which a plurality of convex portions 22 are arranged in series in the width direction (Y direction) of the diaper 1 are formed in the vertical direction of the diaper 1. .
As shown in FIG. 4B, the convex portions 22 of the end regions 2 a and 2 b have a substantially rectangular shape in plan view, and the long side of the rectangle is in the width direction (Y direction) of the diaper 1. The short side extends along the longitudinal direction (X direction) of the diaper 1. The convex portion 22 is hollow inside. The convex part 22 in this embodiment has the same form as the convex part 21 shown in FIG.

The convex portions 22 in the end regions 2a and 2b efficiently absorb the liquid flow from the central region 2c in the width direction of the end regions 2a and 2b in order to prevent leakage of urine and soft stool from the diaper ends. From the viewpoint, it is preferable to have the following dimensional ratio, arrangement, and the like.
The convex portion 22 preferably has a ratio (L5 / L6) of a length L5 in the diaper width direction (Y direction) and a length L6 in the diaper longitudinal direction (X direction) of 1.0 to 5.0. More preferably, it is 1.2-3.0.
It is preferable that ratio (P3 / L5) of the pitch P3 of the convex part 22 of the diaper width direction (Y direction) and the said length L5 is 1.05-3.0, More preferably, it is 1.05-2. 0.
It is preferable that ratio (P4 / L6) of the pitch P4 of the convex part row | line | column R in the diaper longitudinal direction (X direction) and the said length L6 is 1.0-5.0, More preferably, it is 1.0-3. .0.
The distance L7 between the protrusions 22 in each protrusion row R is preferably 0.5 to 10.0 mm, particularly preferably 0.5 to 5.0 mm. The interval L8 between the adjacent protrusion rows R and R is 0. .5 to 10.0 mm, particularly 1.0 to 5.0 mm is preferable.

As shown in FIG. 2, the topsheet 2 in the diaper 1 of the first embodiment is the first non-woven fabric 23 in which the convex portions 21 and 22 are formed and the first non-woven fabric 23 in the portions other than the convex portions 21 and 22. It consists of a substantially flat second nonwoven fabric 24 joined to one nonwoven fabric 23.
As the 1st and 2nd nonwoven fabrics 23 and 24, various publicly known nonwoven fabrics can be used as a material for forming a surface sheet of an absorbent article such as disposable diapers and sanitary napkins, for example. For example, an air-through nonwoven fabric in which heat-bonding points between fibers are formed on a fiber web obtained by the card method or airlaid method, and heat-bonding points between fibers by a heat roll method on a fiber web obtained by the card method. Heat roll nonwoven fabric, heat embossed nonwoven fabric, spunbond nonwoven fabric (S), meltblown nonwoven fabric (M), spunbond-meltblown composite nonwoven fabric (SM, SMS, SMMS, etc.), spunlace nonwoven fabric, needle punched nonwoven fabric, etc. Nonwoven fabric can be used.

  The topsheet 2 used in the first embodiment corresponds to, for example, the first nonwoven fabric 23, the first roll having convex portions corresponding to the convex portions 21 and 22 on the peripheral surface, and the convex portions of the first roll. After forming a large number of convex portions 21 and 22 on the first nonwoven fabric 23, the second nonwoven fabric 24 is merged with the second roll having a concave portion having a shape corresponding to the convex portion at a position to be formed. The two nonwoven fabrics 23, 24 are obtained by joining the portions of the first nonwoven fabric 23 other than the convex portions 21, 22. As a method for joining, there are a method using an adhesive, a method for heat-sealing, a method for using them together, and the like.

According to the diaper 1 of 1st Embodiment, since the convex part 21 of the shape long in the diaper longitudinal direction is formed in the center area | region 2c by the aspect mentioned above, the liquid supplied on the center area | region 2c is a diaper. It is easier to diffuse in the diaper longitudinal direction than in the width direction. Thereby, it is absorbed by the absorber from a wide range of the absorber long in the longitudinal direction of the diaper 1, and the absorption capacity of the absorber can be effectively utilized. On the other hand, when the amount of liquid flowing in the longitudinal direction is large and vigorous, there is a risk of leakage from the end portion. However, in the end region 2a, 2b, a convex portion 22 having a shape long in the diaper width direction is formed. Since they are formed, they function as a three-dimensional barrier, and also diffuse in the diaper width direction to relieve the momentum, so that leakage of liquid from the end of the diaper can also be prevented.
Moreover, the convex part 21 of the center area | region 2c and the convex part 22 of edge part area | region 2a, 2b are arrange | positioned in the state disperse | distributed to both the longitudinal direction and the width direction of the diaper 1, and do not extend continuously in one direction. The shape stability of the convex part is good even when worn, and the liquid diffusibility during urination is also good.

  Explaining the forming material of each part in the diaper 1, as the back sheet 3, the absorbent body 4, the three-dimensional gather forming sheet 72, various known materials used as respective materials in the conventional disposable diaper, It can be used without particular limitation. As the absorbent body 4, an aggregate of fibers such as pulp fibers or a body in which a water-absorbing polymer is held and wrapped with a covering sheet such as tissue paper or a water-permeable nonwoven fabric can be used.

Next, the disposable diaper of other embodiment of this invention is demonstrated.
About other embodiment, a different point from the disposable diaper of 1st Embodiment mentioned above is demonstrated, and description is abbreviate | omitted about the same point. The points described above with respect to the first embodiment are applied as appropriate to points that are not particularly described.

As shown in FIG. 5, the disposable diaper of the second embodiment has a convex portion 22 in the end region 2 a on the abdominal side A side and / or the end region 2 b on the back side B side. It is arranged at a higher density than the part 21.
By densely arranging the convex portions 22 in the end regions 2a and 2b, the liquid blocking effect by the end regions 2a and 2b is improved. From the viewpoint of improving the damming effect, it is preferable that the end regions 2a and 2b have narrower intervals L3 and L7 (see FIG. 4) between the convex portions 21 and 22 in each convex row R than the central region 2c. . The interval L7 is more preferably 100 to 200%, particularly 110 to 150% of the interval L3.
This configuration is particularly preferable when the absorbent body of the diaper has an hourglass shape that is wide at the end portion, and the central portion that is the urination point has a narrow absorbent body width and a low absorption capacity. Absorber can be used effectively by damming at the end and diffusing in the diaper width direction.

As shown in FIG. 6, the disposable diaper according to the third embodiment has a convex portion 22 in the end region 2a on the abdominal side A side and / or the end region 2b on the back side B side. They are arranged at wider intervals than the portion 21.
By disposing the protrusions 22 at wide intervals in the end regions 2a and 2b, the liquid permeability in the end regions 2a and 2b can be improved, and the liquid flowing from the urination point can be surely received in the end regions. Permeate to prevent leakage from the end. From the viewpoint of improving liquid permeability, the end regions 2a and 2b are wider in the end regions 2a and 2b than in the central region 2c, and the interval L4 between the protrusions is larger than the interval L4 between the protrusions. , L8 is preferably wide. The interval L8 of the convex portion rows is more preferably 100 to 200%, particularly 110 to 150% of the interval L4.
This configuration is particularly preferable when the diaper absorber has an hourglass shape that is wide at the end portion, and the central portion, which is the urination point, has a narrow absorber width and a low absorption capacity. Leakage due to liquid flow can be prevented at the end portion having good permeability.

As shown in FIG. 7, the disposable diaper of the fourth embodiment is such that the height H2 of the convex portion 22 of the end region 2a on the abdominal side A and / or the end region 2b on the back B side is the center. The height H1 is higher than the convex portion 21 in the region 2c. By making the height H2 of the convex portions 22 of the end regions 2a and 2b higher than the height H1 of the convex portions 21 of the central region 2c, the flow of urine and soft stool flowing from the central region 2c toward the front and rear is further increased. It can be effectively dammed up.
The height H2 (see FIG. 7) of the convex portion 22 in the end regions 2a and 2b is preferably 0.5 to 6.0 mm, particularly 1.5 to 4.0 mm, and the convex portion 21 in the central region 2c. The height H1 (see FIG. 7) is preferably 0.5 to 4.0 mm, particularly preferably 1.0 to 2.5 mm. A difference (H2−H1) between the height H2 and the height H1 is preferably 0.5 to 5.0 mm, particularly preferably 1.0 to 3.0 mm. The ratio of the height H2 to the height H1 (H2 / H1) is preferably 1.2 to 6.0, particularly preferably 1.5 to 4.0.
In the diaper 1 of the first embodiment, the height H2 of the convex portion 22 of the end region 2a on the ventral side A side and the end region 2b on the back side B side is higher than the convex portion 21 in the central region 2c. It is substantially the same as the height H1.

As mentioned above, although several embodiment of this invention was described, this invention is not restrict | limited to embodiment mentioned above, In the range which does not deviate from the meaning of this invention, various deformation | transformation are possible.
For example, the size and shape of the convex portions 21 and 22 can be made different between the end regions 2a and 2b and the central region 2c. In addition, a sheet obtained by cutting a sheet having only a convex portion that is long in one direction, rotating a part of the sheet by 90 degrees, and then rejoining the sheet can be used as the top sheet in the present invention.
Moreover, in the diaper 1 of 1st Embodiment, although the convex part 22 of the shape long in the diaper width direction is formed in the edge part area | regions 2a and 2b of both the ventral | abdominal side part A and the back | dorsal side part B, A convex portion 22 having a shape that is long in the diaper width direction may be formed only in one of the regions.

Further, the convex portions 21 and 22 of the surface sheet may be other shapes such as an elliptical shape and an oval shape instead of the substantially rectangular shape in plan view. Further, the surface sheet is composed of only the three-dimensionally shaped first nonwoven fabric 23, or composed of a nonwoven fabric and an apertured film, instead of the first nonwoven fabric 23 and the second nonwoven fabric 24. Also good.
In addition, the absorbent article of the present invention may be a pants-type disposable diaper instead of a deployable disposable diaper, and may further be a sanitary napkin, a panty liner (a descending article sheet), an incontinence pad, or the like. . .

  The description omitted in one embodiment described above and the requirements of only one embodiment can be applied to other embodiments as appropriate, and the requirements in each embodiment can be appropriately changed between the embodiments. Can be substituted.

FIG. 1 is a plan view of a disposable diaper that is an embodiment of the absorbent article of the present invention, partially broken away. 2 is a cross-sectional view taken along line II-II in FIG. It is an expanded sectional view which expands and shows a part of central region of the surface sheet of the disposable diaper shown in FIG. 4A and 4B are explanatory diagrams of the arrangement of the convex portions, etc., FIG. 4A is an explanatory diagram of the convex portions in the central region, and FIG. 4B is an explanatory diagram of the convex portions in the end region. FIG. 5 is an explanatory view showing the arrangement of the convex portions of the topsheet in another embodiment of the present invention. FIG. 6 is an explanatory view showing the arrangement of the convex portions of the topsheet in yet another embodiment of the present invention. FIG. 7: is sectional drawing (sectional drawing in alignment with a diaper longitudinal direction) which shows the surface sheet in further another embodiment of this invention.

Explanation of symbols

1 disposable diaper (absorbent article)
2 surface sheet 2a, 2b edge part area 22 convex part (convex part of edge part area)
2c Central area 21 convex part (convex part of central area)
23 1st nonwoven fabric 24 2nd nonwoven fabric 3 Back surface sheet 4 Absorbent body 5 Fastening tape 6 Landing tape A Back side part B Abdominal side part C Crotch part R Convex part row

Claims (5)

In the absorbent article formed substantially vertically long, comprising a liquid-permeable top sheet, a back sheet and an absorber disposed between both sheets,
The topsheet has a large number of convex portions that are long in the longitudinal direction in a central region located in the central portion in the longitudinal direction of the absorbent article, and has absorbent properties in end regions located before and after the central region. There are a number of convex portions that are long in the width direction of the article, and the plurality of convex portions in each of the central region and the end region are arranged in a state of being dispersed in the longitudinal direction and the width direction of the absorbent article. Absorbent article.   In the central region, a plurality of rows of convex portions in which a plurality of convex portions are arranged in series in the longitudinal direction of the absorbent article are formed in the width direction of the absorbent article, and a plurality of rows are formed in the end region. The absorptive article according to claim 1 in which a plurality of convex part rows which a convex part forms in series in the width direction of an absorptive article are formed in the longitudinal direction of an absorptive article.   The absorptive article according to claim 2 in which the interval of the convex part in said convex part row is narrower in said end part field than said central field.   The absorbent article according to claim 2, wherein the end region is wider in the end region than the central region, and the interval between the convex portions is wider.   The absorbent article in any one of Claims 1-4 whose height of the said convex part is higher in the said edge part area | region than the said center area | region.

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