JP2019010348A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article which can sufficiently prevent leakage of excrement such as urine and loose stool and has three-dimensional gathers excellent not only in the texture in the longitudinal direction and the texture in the width direction but also in the texture in the height direction. SOLUTION: In an absorbent article 1 provided with three-dimensional gathers, the three-dimensional gathers are formed by bending a nonwoven fabric and double-stacking them, and fixing an elastic elastic member 33 between the double nonwoven fabrics in a state of being extended in the longitudinal direction. It has a structure, and has a non-woven fabric, basis weight, bending rigidity B by bending tester KES-FB2, bending hysteresis 2HB, softness TS7, smoothness TS750, hydraulic resistance tester WP-1000K by tissue softness measuring device TSA. The water pressure resistance in the low water pressure method is 150 mmAq or more and 200 mmAq. [Selection diagram] Fig. 1

Description

  The present invention relates to an absorbent article that can sufficiently prevent excrement such as urine and loose stool from leaking and has a three-dimensional gather with excellent texture.

  In general, an absorbent article is composed of a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the top sheet and the back sheet. The body fluid is absorbed by the absorbent body through the top sheet. There are various types of these absorbent articles such as a tape-type paper diaper, a pants-type paper diaper, a urine picking pad, a light incontinence pad, and the like.

  Here, these absorbent articles generally include a pair of three-dimensional gathers in the width direction in order to prevent side leakage such as urine and loose stool. In addition, the three-dimensional gather is in direct contact with the skin, and further, friction is applied during operation. Therefore, the texture of the three-dimensional gather is particularly important for infants with weak skin. So far, studies have been made on the texture of three-dimensional gathers for absorbent articles having three-dimensional gathers.

  As an absorptive article by which such examination was made, for example, in patent documents 1, inner solid gathers arranged on both sides of the absorptive main body and outer solid gathers which are outside in the width direction from the inner solid gathers are disclosed. An absorbent article in which a water-repellent film is continuously arranged from the non-skin contact surface side of the absorbent core to the outer solid gather and the inner solid gather is disclosed. It is said that the side-leakage prevention function is further improved by continuously arranging the water-repellent film on the gathers, and the touch of the three-dimensional gathers in contact with the skin is softened to reduce the burden on the skin. It is supposed to be possible.

  Further, in Patent Document 2, each of a pair of three-dimensional gathers is an absorption formed by using a sheet that has raised at least a part of a spunbond nonwoven fabric or a laminated nonwoven fabric of a spunbond layer and a meltblown layer. Since an article is disclosed and solid gathers are raised, it is said that the touch when worn is improved.

  Further, Patent Document 3 discloses an absorbent article in which at least the skin-side constituent portion on the leading end side of the rising portion of the nonwoven fabric constituting the three-dimensional gather is subjected to softening embossing, and the embossing is performed. By doing so, the touch of the three-dimensional gather is supposed to be softened.

JP 2013-252323 A JP 2013-5879 A JP 2017-237872

  Here, in the absorbent articles described in Patent Document 1 to Patent Document 3, the texture of the three-dimensional gather in the longitudinal direction and the width direction is good, but the texture when the three-dimensional gather is pressed from the height direction is not sufficient. In addition, none of the absorbent articles described in the above-mentioned patent documents was fully satisfactory from the viewpoint of texture. Therefore, the present invention has been made in view of the above problems, can sufficiently prevent leakage of excrement such as urine and loose stool, and not only the texture in the longitudinal direction and the width direction but also in the height direction. An object is to provide an absorbent article having a three-dimensional gather with excellent texture.

  The inventors of the present invention have conducted extensive research in view of the above problems. As a result, it has been found that the above-mentioned problems can be solved by the absorbent article prepared by adjusting the nonwoven fabric constituting the three-dimensional gather, and the present invention has been completed. Specifically, the present invention provides the following.

(1) A first aspect of the present invention is an absorbent having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between the top sheet and the back sheet. The absorbent article has a pair of three-dimensional gathers along the longitudinal direction at both ends in the width direction. It has a structure in which an elastic elastic member is fixed in a state of being stretched in the longitudinal direction between nonwoven fabrics, and the basis weight of the nonwoven fabric is 11 g / m ² or more and 17 g / m ² or less. The bending stiffness B by -FB2 is 0.010 gf · cm ² / cm or less, the bending hysteresis 2HB is 0.005 gf · cm / cm or less, and the softness of the nonwoven fabric by the tissue softness measuring device TSA TS7 is 5.0 dBV ² rms or less, smoothness TS750 is 10.0 dBV ² rms or less, and the water pressure resistance in the low water pressure method by the water pressure tester WP-1000K is 150 mmAq or more and 200 mmAq or less. It is an absorbent article.

  (2) The second aspect of the present invention is the absorbent article according to (1), wherein the three-dimensional gather has an average friction coefficient MIU of 0.3 or less and an average friction according to the friction tester KES-SE. The average deviation MMD of the coefficient is 0.017 or less.

  (3) A third aspect of the present invention is the absorbent article according to (1) or (2), wherein the compression hardness LC of the three-dimensional gather by the handy compression tester KES-G5 is 0. It is characterized by being 5 or less.

  (4) A fourth aspect of the present invention is the absorbent article according to any one of (1) to (3), wherein the nonwoven fabric is a composite nonwoven fabric in which a spunbond nonwoven fabric and a meltblown nonwoven fabric are laminated. It is characterized by this.

  Since the characteristics of the non-woven fabric constituting the three-dimensional gather are adjusted as described above, the absorbent article of the present invention can sufficiently prevent leakage of excrement such as urine and loose stool, and in the longitudinal direction and the width direction. It has a three-dimensional gather that excels not only in texture but also in texture in the height direction.

It is the top view seen from the top sheet side, when using the absorbent article which concerns on embodiment of this invention as a tape stop paper diaper. FIG. 2 is a schematic cross-sectional view taken along line X ₁ -X _{1 in} FIG. 1. It is a graph for demonstrating the measuring method of compression hardness.

  Hereinafter, with reference to FIG.1 and FIG.2, the tape stop paper diaper is demonstrated in detail as an example of the absorbent article 1 which concerns on embodiment of this invention. The absorbent article may be a tape-type paper diaper, a pants-type paper diaper, a urine-absorbing pad, a light incontinence pad, or other absorbent articles, particularly for baby or adult use, and is particularly limited. It is not a thing. In the description of the present embodiment, the same reference numerals are given to the same elements throughout. In the following description of the present specification, the body fluid refers to a liquid discharged from the body such as urine, blood, and water in soft stool. Moreover, excretion means what is excreted from human bodies, such as not only liquid but urine and loose stool. In addition, in description of this specification, the longitudinal direction of the absorbent article 1 is a direction over front and back of the wearer when the absorbent article 1 is worn, and is a direction indicated by a symbol Y in the figure. Moreover, the width direction of the absorbent article 1 is a direction that is transverse or orthogonal to the longitudinal direction, and is a direction indicated by a symbol X in the drawing. Furthermore, in this specification, the body side surface of the absorbent article 1 refers to the surface that comes into contact with the wearer's skin when the absorbent article 1 is worn, and the clothing side surface is worn when the absorbent article 1 is worn. The surface that comes into contact with the person's clothing.

<Absorbent article>
Drawing 1 is a top view seen from the top sheet 21 side, when using absorbent article 1 concerning an embodiment of the present invention as a tape stop paper diaper. 2 is a schematic cross-sectional view of the absorbent article 1 taken along line X ₁ -X ₁ in FIG. As shown in FIGS. 1 and 2, the absorbent article 1 includes a liquid-permeable top sheet 21 disposed on the body side, and a liquid-impermeable back sheet 23 disposed to face the top sheet 21. And an absorbent body 22 disposed between the top sheet 21 and the back sheet 23. Thereby, the absorber 22 becomes a structure sandwiched between the top sheet 21 and the back sheet 23. Moreover, the absorbent article 1 has a pair of three-dimensional gathers 32 along the longitudinal direction at both ends in the width direction.

[Three-dimensional gather]
As shown in FIGS. 1 and 2, the absorbent article 1 has a pair of three-dimensional gathers 32 along the longitudinal direction at both ends in the width direction in order to prevent side leakage of the user's excrement. The three-dimensional gather 32 has a structure in which the nonwoven fabric is folded and overlapped, and the elastic elastic member 33 is fixed between the double nonwoven fabrics in a state of being stretched in the longitudinal direction. In addition, in FIG. 1, the display of the three-dimensional gather 32 is abbreviate | omitted among these members, and the elastic elastic member 33 is shown. The three-dimensional gather 32 is fixed to the top sheet 21 and the back sheet 23 at the fixed end of the absorbent article 1, as shown in FIG. The bent part is the free end. Thereby, the three-dimensional gather 32 can have a standing property and can be deformed in accordance with the wearer's body shape.

  As the elastic elastic member 33, for example, a polyurethane thread, a strip-shaped polyurethane film, a synthetic rubber, a thread-shaped or strip-shaped natural rubber, or the like is used. The thickness of the elastic elastic member 33 is preferably 940 dtex or less.

(Three-dimensional gathered nonwoven fabric)
The nonwoven fabric used for the three-dimensional gather 32 is a water-repellent or liquid-impervious nonwoven fabric formed of hydrophobic fibers, for example, a spunbond nonwoven fabric or a spunbond nonwoven fabric and a melt blown nonwoven fabric to prevent side leakage of excreta. In the present invention, a composite nonwoven fabric obtained by laminating a spunbond nonwoven fabric and a melt blown nonwoven fabric is preferable in order to achieve both flexibility and water resistance of the sheet. In the above composite nonwoven fabric, the lamination mode of the spunbond nonwoven fabric and the meltblown nonwoven fabric is not particularly limited, but in order to improve the flexibility and water resistance of the sheet effectively and in a balanced manner, the spunbond nonwoven fabric / meltblown nonwoven fabric / Composite nonwoven fabric composed of three layers of spunbond nonwoven fabric, composite nonwoven fabric composed of four layers of spunbond nonwoven fabric / melt blown nonwoven fabric / melt blow nonwoven fabric / spunbond nonwoven fabric, spunbond nonwoven fabric / melt blow nonwoven fabric / melt blow nonwoven fabric / melt blow nonwoven fabric / spun bond nonwoven fabric / It is preferably any one of composite nonwoven fabrics having a six-layer structure of spunbond nonwoven fabrics. Incidentally, the basis weight of strength and workability viewpoint of nonwoven fabric is 11g / ^{m 2} or more 17 g / ^{m 2} or less.

(Parameters for solid gathering)
The elastic stretchable member 33 constituting the three-dimensional gather 32 is fixed in the stretched state as described above. However, as the elastic stretchable member 33 contracts, the nonwoven fabric constituting the three-dimensional gather 32 is also contracted in a pleated shape. At this time, if the contraction force of the elastic elastic member 33 is uniformly transmitted to the nonwoven fabric, fine and uniform pleats are formed, and the texture in the height direction of the three-dimensional gather 32 when the skin touches is improved. Focusing on this point, the inventors of the present invention adjusted the parameters relating to the three-dimensional gather as follows.

(Bending rigidity B and bending hysteresis 2HB)
In the absorbent article 1 of the present invention, the bending rigidity B of the nonwoven fabric constituting the three-dimensional gather 32 by a bending tester KES-FB2 (made by Kato Tech Co., Ltd.) is 0.010 gf · cm ² / cm or less, 0.0005 gf · cm ² / cm or more and 0.007 gf · cm ² / cm or less is preferable, and 0.001 gf · cm ² / cm or more and 0.005 gf · cm ² / cm or less is more preferable. . Further, the bending hysteresis 2HB of the nonwoven fabric constituting the three-dimensional gather 32 by a bending tester KES-FB2 (manufactured by Kato Tech Co., Ltd.) is 0.005 gf · cm / cm or less, and 0.0005 gf · cm / cm or more. It is preferably 0.004 gf · cm / cm or less, and more preferably 0.001 gf · cm / cm or more and 0.003 gf · cm / cm or less. In addition, about the bending rigidity B, it shows that it is easy to bend, so that a numerical value is low, About the bending hysteresis 2HB, it shows that it is easy to return, so that a numerical value is low. In the present invention, the nonwoven fabric is moderately softened by adjusting the bending stiffness B and the bending hysteresis 2HB of the nonwoven fabric to the above numerical ranges, and the shrinkage force of the elastic elastic member 33 is uniformly transmitted to the nonwoven fabric, and is fine and uniform. A pleat is formed, and not only the texture in the longitudinal direction and the width direction in the three-dimensional gather 32 but also the texture in the height direction can be improved.

The measuring method of bending rigidity B and bending hysteresis 2HB is as follows. Measurement is performed by inserting a sample into the fixed chuck and moving chuck of the bending tester KES-FB2. The moving chuck moves to the maximum positive curvature +2.5 cm ⁻¹ and reverses to pass through the curvature 0, and then moves to the negative maximum curvature −2.5 cm ⁻¹ and reverses to complete the measurement at the curvature 0. Thus, a reciprocal curve of the bending moment with respect to the curvature of one cycle is obtained. In the reciprocating curve of bending moment, the stiffness B bending an average value of the slope between the slope between the curvature 0.5 cm ^-1 and 1.5 cm ^-1 curvature -0.5Cm ^-1 and -1.5Cm ^-1 , the hysteresis 2HB bending the average value of the hysteresis width in the curvature 0.5 cm ^-1 and -0.5cm ^-1.

(Softness TS7, smoothness TS750, rigidity D)
In the absorbent article 1 of the present invention, the softness TS7, smoothness TS750, and rigidity D of the nonwoven fabric constituting the three-dimensional gather 32 by the tissue softness measuring device TSA (manufactured by emtec; Tissue Softness Analyzer) are as follows. By adjusting, not only the texture in the longitudinal direction and the width direction in the three-dimensional gather 32 but also the texture in the height direction can be improved, and the lateral leakage of excrement such as urine and loose stool can be sufficiently prevented.
In the absorbent article 1 of the present invention, the intensity (TS7) of the maximum peak of the spectrum including 6500 Hz obtained automatically by the software on the tissue softness measuring device TSA of the nonwoven fabric constituting the three-dimensional gather 32 is 5. 0dBV is a ² rms or less, preferably 1.0dBV at ² rms or more 4.8dBV ² rms or less, and more preferably less 2.0dBV ² rms or more 4.5dBV ² rms. This TS7 is an index of the softness of the nonwoven fabric. When TS7 falls within the above range, the softness of the three-dimensional gather 32 is maintained in a well-balanced manner, and the contraction force of the elastic elastic member 33 is evenly applied to the nonwoven fabric. In addition, fine and uniform folds are formed, and not only the texture in the longitudinal direction and the width direction in the three-dimensional gather 32 but also the texture in the height direction can be improved.

Furthermore, in the absorbent article 1 of the present invention, when the nonwoven fabric constituting the three-dimensional gather 32 is measured by the tissue softness measuring device TSA, the first from the low frequency side automatically obtained by software on the TSA of and the maximum peak intensity of the spectrum (TS750) is 10.0dBV ² rms or less, preferably less 1.0dBV ² rms or more 9.5dBV ² rms, 3.0dBV ² rms or more 9.0dBV ² rms or less It is more preferable that This TS750 is an index of the smoothness of the nonwoven fabric, and the smoothness of the three-dimensional gathers 32 is maintained in a well-balanced manner when the TS750 is within the above range.

  In addition, in the absorbent article 1 according to the present invention, the tissue softness measuring device TSA of the nonwoven fabric constituting the three-dimensional gather 32 is set to 100 mN without rotating the bladed rotor with respect to the nonwoven fabric sample placed on the sample stage. When pressed from above with an indentation pressure of 600 mN, the measured value of stiffness D, expressed by the amount of deformation in the vertical direction of the sample between the indentation pressures of 100 mN and 600 mN, is 3.5 mm / N or less. It is preferably 1.0 mm / N or more and 3.0 mm / N or less. When the rigidity D is within the above range, the rigidity of the three-dimensional gather 32 is maintained in a balanced manner.

  A method for measuring TS750, TS7, and D using the tissue softness measuring device TSA and a measuring device used therefor are described in detail in, for example, Japanese Patent Application Laid-Open No. 2013-236904 (FIG. 3 to FIG. 3). (See also 5). For various measurement methods using the tissue softness measuring device TSA, see the above-mentioned patent document.

(Water pressure resistance)
In the absorbent article 1 of the present invention, the non-woven fabric constituting the three-dimensional gather 32 has a water pressure resistance of 150 mmAq or more and 200 mmAq or less using a water pressure resistance tester WP-1000K (manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd.) is there. By adjusting the water pressure resistance in this way, the three-dimensional gather 32 can ensure waterproofness, which is an important property as a base, and can effectively prevent side leakage such as urine and loose stool. The measurement is performed by a method according to JIS L 1092. Specifically, a container (level device) containing water is raised at a speed of 600 mm / min, and water is measured from three locations of a nonwoven fabric (15 cm × 15 cm, the area of the test piece in contact with water is 100 cm ² ) as a test piece. Measure the water level (mm) when.

(Average friction coefficient MIU and average deviation MMD of average friction coefficient)
In the absorbent article 1 of the present invention, the average friction coefficient MIU and the average deviation MMD of the average friction coefficient by the frictional tester KES-SE (made by Kato Tech Co., Ltd.) of the three-dimensional gather 32 are 0.017 or less. It is preferable that As for the average friction coefficient MIU, the higher the value, the less slipping, and the higher the average deviation MMD of the average friction coefficient, the lower the smoothness and the greater the roughness. In the present invention, the texture in the height direction can be improved more effectively by adjusting the average friction coefficient MIU of the three-dimensional gather 32 and the average deviation MMD of the average friction coefficient to the above numerical range.

  The measurement method of the average friction coefficient MIU and the average deviation MMD of the average friction coefficient is as follows. Using a friction tester KES-SE (manufactured by Kato Tech Co., Ltd.), a sample is placed on a smooth metal flat surface, and a speed of 0.1 cm / second is applied to a 0.5 cm wide and 2 cm long region on the sample. The average friction coefficient MIU and the average deviation MMD of the friction coefficient are measured while the contactor is moved horizontally at a constant speed. As the contact, ten piano wires of 0.5 mm are used, and the load applied to the contact is 25 gf.

(Compression hardness LC)
In the absorptive article 1 of the present invention, it is preferred that compression hardness LC by handy compression testing machine KES-G5 (made by Kato Tech Co., Ltd.) of solid gather 32 is 0.5 or less. The compression hardness LC indicates how to deform with respect to the force compressed in the thickness direction, and the closer the numerical value is to 1, the harder it is to compress. FIG. 3 is a graph for explaining a compression hardness measurement method. The method for measuring the compression hardness is as follows. A handy compression tester KES-G5 (manufactured by Kato Tech Co., Ltd.) was used. First, a sample was placed on a test stand, and a copper pressurizer having a circular plane with an area of 2 cm ² was placed from above the sample at a speed of 0.01 cm / second The sample is compressed by being pressed into the sample under conditions of a maximum compressive stress of 20 gf / cm ² . After the measurement, the compression stress-displacement diagram with the vertical axis representing the compressive stress and the horizontal axis representing the distance T between the pressurizers is the curve BA in FIG. A value obtained by dividing the area (a) surrounded by the curve BA, the straight line BC, and the straight line AC by the area of the triangle ABC having a right angle with the heel BCA shown in FIG. By adjusting the compression hardness LC of the three-dimensional gather 32 to the above range, the texture in the height direction can be further effectively improved.

[Top sheet]
The top sheet 21 allows body fluid to pass quickly toward the absorber 22, and is disposed to face the back sheet 23 with the absorber 22 interposed therebetween. Since the top sheet 21 is a sheet that comes into contact with the skin, the top sheet 21 has a soft touch and does not irritate the skin, such as synthetic fibers such as polypropylene and polyethylene, and reproduction of rayon and the like. A hydrophilic nonwoven fabric obtained by a known processing method such as an air-through method, a thermal bond method, a spunlace method, or a spunbond method using natural fibers such as fiber and cotton, or a composite nonwoven fabric obtained by combining them, and an open polyethylene film An opening film such as a foam film such as urethane foam can be used. Further, the top sheet 21 may be embossed or perforated on the surface in order to improve the liquid permeability. As a method for performing these embossing and perforating processes, a known method can be carried out without limitation. In order to reduce irritation to the skin, the top sheet 21 may contain a lotion, an antioxidant, an anti-inflammatory component, a pH adjuster, an antibacterial agent, a moisturizing agent and the like.

From the viewpoint of strength, workability, and liquid return amount, the basis weight of the top sheet 21 is preferably 15 g / m ² or more and 200 g / m ² or less. Although there is no restriction | limiting in particular as a shape of the top sheet 21, What is necessary is just the shape which covers the absorber 22 required in order to guide a bodily fluid to the absorber 22 so that there may be no leak.

In the present invention, a liquid diffusive sheet may be provided between the top sheet 21 and the absorber 22 in order to promote diffusion of body fluid to the upper surface of the absorber 22. Examples of such liquid diffusive sheets include nonwoven fabrics such as air-through nonwoven fabric, point bond nonwoven fabric, spunbond nonwoven fabric, and meltblown nonwoven fabric, and composite nonwoven fabrics laminated with spunbond / meltblown and spunbond / meltblown / spunbond. it can. The thickness of the liquid diffusive sheet is preferably 0.1 mm or more, and the basis weight thereof is preferably 15 g / m ² or more. The shape of the liquid diffusive sheet is not particularly limited, but is preferably a shape that can completely cover the surface of the absorbent body 22 so that bodily fluids such as urine diffuse throughout the absorbent body 22.

[Absorber]
The absorber 22 contains an absorbent fiber as a base material and a superabsorbent polymer (SAP). The absorber 22 may be a single layer or multiple layers.

(Absorbent fiber)
The absorbent fiber is not particularly limited as long as it is generally used for absorbent articles such as sanitary napkins, paper diapers, and urine-absorbing pads. For example, fluff pulp, cotton, rayon, acetate, tissue, absorbent paper, hydrophilic paper Can be mentioned. Among these, it is preferable to use fluff pulp from the viewpoint of absorbability. Examples of fluff pulp include wood pulp (for example, softwood bleached kraft pulp (N-BKP) such as Southern pine or Douglas fir), synthetic fiber, resin fiber, non-wood pulp, etc. it can. When fluff pulp is used for the absorbent fibers as the base material of the absorbent body 22, the basis weight of the absorbent fibers is preferably 100 g / m ² or more and 800 g / m ² or less for the entire absorbent body 22. Thereby, more body fluids can be absorbed without impairing the touch.

(SAP)
The SAP of the absorbent 22 is not particularly limited as long as it absorbs body fluids and can prevent backflow. Sodium polyacrylate copolymer, polyaspartate copolymer, (starch-acrylic) An acid) graft copolymer, an (acrylic acid-vinyl alcohol) copolymer, an (isobutylene-maleic anhydride) copolymer and a saponified product thereof can be used. Among these, a sodium polyacrylate copolymer is preferable from the viewpoint of the amount of absorption per weight.

The basis weight of the SAP contained in the absorber 22 is preferably 50 g / m ² or more and 500 g / m ² or less for the entire absorber 22. Moreover, it is preferable that the weight of SAP is 15 mass% or more and 50 mass% or less with respect to the absorber 22 whole.

  In the absorbent body 22, the absorbent fiber and the SAP are preferably formed by mixing SAP particles in the absorbent fiber, or an SAP sheet in which the SAP particles are fixed between the absorbent fibers.

  Further, the absorbent article 1 of the present invention may have a carrier sheet 28 that covers the absorbent body 22 as shown in FIG. 2 for the purpose of preventing leakage of SAP particles and stabilizing the shape of the absorbent body 22. Good. The base material of the carrier sheet 28 may be any material having hydrophilicity, and examples thereof include hydrophilic nonwoven fabrics such as tissue, absorbent paper, spunbond nonwoven fabric, and airlaid nonwoven fabric. When a plurality of carrier sheets 28 are provided, the base material of the carrier sheet 28 may be the same or different.

[Back sheet]
The back sheet 23 may be formed using a base material having liquid impermeability so that the body fluid held by the absorbent body 22 does not wet the clothing, and the resin film or the resin film and the nonwoven fabric are laminated. Formed from a material such as a composite sheet. The non-woven fabric used for the composite sheet is not particularly limited, and examples thereof include spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunbond / meltblown, spunbond / meltblown / spunbond laminated nonwoven fabrics, and composite materials thereof. . Examples of the resin film include polyester, polyvinyl alcohol, polyethylene, polypropylene, and a composite film of polyethylene and polypropylene.

From the viewpoint of strength and workability, the basis weight of the back sheet 23 is preferably 15 g / m ² or more and 40 g / m ² or less. Moreover, in order to prevent the stuffiness at the time of mounting | wearing, it is preferable to give the back seat | sheet 23 breathability. In order to provide the back sheet 23 with air permeability, for example, a filler may be added to the resin film of the base material, or the back sheet 23 may be embossed for perforation. In addition, calcium carbonate can be mentioned as a filler, The compounding method can perform a well-known method without a restriction | limiting.

(West gather)
As shown in FIG. 1, a waist gather 35 is provided in which the absorbent article 1 is formed so as to be in contact with the circumference of the wearer's waist and the longitudinal ends of the absorbent article 1 are in close contact with the waist portion. May be. The waist gathers 35 may have any shape such as a thread shape, a strip shape, and a waist belt shape, and are arranged along the width direction rather than the longitudinal direction of the absorbent article 1 to control the stretch characteristics of the absorbent article 1. . As the waist gather 35, for example, any elastic shrinkable material such as one or a plurality of thread rubbers, a waist belt in which the thread rubbers are fixed to a nonwoven web, an elastomer film, an elastic foam material, an elastomer cloth, or the like can be used.

(Leg gather)
As shown in FIG. 1, the absorbent article 1 of the present invention may be provided with a pair of left and right leg gathers 34 from the abdominal side to the back side of the absorbent article 1. The leg gathers 34 are formed of, for example, an elastic member such as rubber thread and a sheet such as a nonwoven web. By providing the leg gathers 34, it is possible to improve the fit at the part around the crotch.

(Side flaps and side panels)
In the absorbent article 1 of the present invention, at least a pair of side flaps 24 may be formed on both sides in the width direction of the back side portion and the back side portion of the back sheet 23. Further, each of the side flaps 24 on the back side portion may be provided with a side panel 25 at the width direction edge portion on the free end side and two fastening tapes 26 at the width direction edge portion on the free end side of the side panel 25. Good. Further, the side panel 25 and the fastening tape 26 are not limited to those formed by separate members, and may be formed integrally. The fastening tape 26 is provided with fastening means 30 formed of a hook member constituting a surface fastener for fastening the abdominal side portion and the back side portion on the body side, and each fastening tape 26 on the free end side of the fastening means 30 is provided. A knob 27 may be provided at the tip. On the other hand, a target tape 31 formed of a loop member constituting a hook-and-loop fastener may be provided on the clothing side surface of the abdomen, and the fastening means 30 is looped when the absorbent article 1 is attached to the wearer. It is fixed to the target tape 31 which is a member. Thereby, the absorbent article 1 of this invention can be set as the structure of a tape stop paper diaper.

  In addition, as a base material of the side flap 24, the nonwoven fabric which consists of polyethylene, a polypropylene, a polystyrene, etc. can be mentioned, You may combine these base materials independently or multiple. Moreover, as a base material of the side panel 25 and the fastening tape 26, the resin film and nonwoven fabric which consist of polyethylene, a polypropylene, a polystyrene, etc. can be mentioned, You may combine these base materials independently or multiple. In addition, the hook member refers to a member that is three-dimensionally molded or raised in a hook shape among members constituting the hook-and-loop fastener, and the loop member is a member that forms a pair with the hook member and is densely arranged in a loop shape. It refers to a member that has been brushed. The hook-and-loop member is configured by a pair of the hook member and the loop member. When wearing the absorbent article 1, by bringing the abdomen part to the abdomen side of the wearer with the back side part applied to the wearer's back part, and fastening the fastening tape 26 to the target tape 31, Can be worn by the wearer.

In addition, as above-mentioned, the absorbent article 1 of this invention may be a pants-type paper diaper. In that case, although the absorbent article 1 has an absorptive main body, an interior body, and an exterior body, as a base material used for an interior body and an exterior body, a thermal bond nonwoven fabric and a spun bond nonwoven fabric can be used. The basis weight of the inner body and outer body is preferably 15 g / ^{m 2} or more 40 g / ^{m 2} or less.

[Method of manufacturing absorbent article]
A well-known method can be adopted as a manufacturing method when the absorbent article 1 is a tape-type disposable diaper. For example, the absorber 22 previously covered with the carrier sheet 28 is disposed between the top sheet 21 and the back sheet 23 on which the waist gathers 35, the leg gathers 34, and the side flaps 24 are disposed. In addition, about the three-dimensional gather 32, a nonwoven fabric is bend | folded and piled up double, and it fixes in the state extended in the longitudinal direction between the double nonwoven fabrics, and is fixed to the both ends of the width direction at a longitudinal direction. Arrange along. These members are integrated, folded, and then cut into a predetermined length for manufacturing. As a means for integrating the members, a hot melt adhesive, heat embossing, ultrasonic embossing, high frequency embossing, or the like can be used. It is preferable that the fastening tape 26 is bonded to the back sheet 23 in advance by bonding the fastening means 30 to a base material constituting the fastening tape 26, cutting it into a predetermined shape. In storing the absorbent article 1 in a package or the like, the absorbent article 1 may be folded in the longitudinal direction and the width direction.

  Hereinafter, the present invention will be described in detail with reference to examples. In addition, this invention is not limited to the Example shown below at all.

<Example 1, Comparative Examples 1 and 2>
(Absorbent article)
The fluff pulp and SAP, which were pulverized by pulverizing the pulp sheet, were piled up to prepare an absorbent body. This absorbent body is wrapped in advance with a carrier sheet and laminated together with a top sheet and a back sheet, and a three-dimensional gathered, leg gathered, waist gathered, side flap formed M size tape-stopping diaper (longitudinal dimension is 440 mm, width direction) Was made into absorbent articles of Example 1, Comparative Example 1 and Comparative Example 2. Note that the top sheet, using a air-through nonwoven fabric (basis weight 20 g / ^{m 2),} the backsheet, with a non-breathable polyethylene sheet (basis weight 18g / ^{m 2).}

  In addition, about the three-dimensional gather, the nonwoven fabric was bend | folded and overlap | superposed double, and the elastic elastic member was extended in the longitudinal direction between the double nonwoven fabrics, and was fixed. In each example and comparative example, a composite nonwoven fabric obtained by laminating a spunbond nonwoven fabric and a melt blown nonwoven fabric is used as the nonwoven fabric constituting the three-dimensional gather, and these composite nonwoven fabrics are nonwoven fabrics having different manufacturers and different properties. In addition, the elastic elastic member uses a thread rubber having a thickness of 620 dtex, and the elastic elastic member is spaced by 5 mm at the free end of the three-dimensional gather so that the elongation rate when the natural state is 100% is 220%. Two were provided. Further, a hot melt adhesive was applied to the elastic elastic member with a comb gun at 0.05 g / m and fixed.

(Measurement item)
About the obtained absorbent article, using the method described above, the bending stiffness B and the bending hysteresis 2HB, the softness TS7, the smoothness TS750, the stiffness D, and the water pressure resistance in the low water pressure method of the nonwoven fabric constituting the three-dimensional gather are measured. The results are shown in Table 1. Further, the average friction coefficient MIU, the average deviation MMD of the average friction coefficient, and the compression hardness LC of the three-dimensional gather were measured using the method described above, and the results are shown in Table 1.

(sensory evaluation)
The sensory evaluation by the monitor test was performed about the three-dimensional gather of each tape stop paper diaper obtained in this way. Thirty-three adults evaluated the smoothness when stroking, the softness when stroking, the softness when striking, and the lack of unevenness of rubber on a five-point scale. The results are shown in Table 1.
〇: When 5 or 4 out of 5 grades are 50% or more of the total number △: 5 or 4 out of 5 out of 5 grades 30% or more and less than 50% x: When the number of 5 or 4 points out of 5 grades is less than 30% of the total number

  From the above, it can be seen that the three-dimensional gather used for the absorbent article of the present invention is excellent not only in the texture in the longitudinal direction and the width direction but also in the texture in the height direction.

DESCRIPTION OF SYMBOLS 1 Absorbent article 21 Top sheet 22 Absorbent body 23 Back sheet 24 Side flap 25 Side panel 26 Fastening tape 27 Knob margin 28 Carrier sheet 30 Fastening means 31 Target tape 32 Three-dimensional gather 33 Elastic elastic member for three-dimensional gather 34 Leg gather 35 Waist gather

Claims (4)

A liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent article disposed between the top sheet and the back sheet,
The absorbent article has a pair of three-dimensional gathers along the longitudinal direction at both ends in the width direction,
The three-dimensional gather has a structure in which a non-woven fabric is folded and overlapped, and an elastic elastic member is stretched in the longitudinal direction between the double non-woven fabric and fixed.
The basis weight of the nonwoven fabric is 11 g / m ² or more and 17 g / m ² or less,
The bending stiffness B of the nonwoven fabric by a bending tester KES-FB2 is 0.010 gf · cm ² / cm or less, and the bending hysteresis 2HB is 0.005 gf · cm / cm or less,
The non-woven fabric has a softness TS7 of 5.0 dBV ² rms or less and a smoothness TS750 of 10.0 dBV ² rms or less according to a tissue softness measuring device TSA.
An absorbent article having a water pressure resistance of 150 mmAq or more and 200 mmAq or less in the low water pressure method by the water pressure resistance tester WP-1000K of the nonwoven fabric.   2. The absorbent article according to claim 1, wherein the three-dimensional gather has an average friction coefficient MIU of 0.3 or less and an average deviation MMD of the average friction coefficient of 0.017 or less according to the friction tester KES-SE.   The absorptive article according to claim 1 or 2 whose compression hardness LC by handy compression tester KES-G5 of said solid gathers is 0.5 or less.   The absorbent article according to any one of claims 1 to 3, wherein the nonwoven fabric is a composite nonwoven fabric obtained by laminating a spunbond nonwoven fabric and a meltblown nonwoven fabric.