JP6450103B2 - Pants-type absorbent article - Google Patents

Description

  The present invention relates to a pants-type absorbent article.

  A pants-type absorbent article comprising a top sheet, a back sheet, an interior body including an absorbent body between the top sheet and the back sheet, and an exterior body positioned on the non-skin contact surface side of the interior body In general, gathers are often attached to parts around the user's stomach, legs, etc. so as to make fitting easier. For example, as shown in FIG. 5, these gathers adhere the rubber thread 110 as an elastic member between the nonwoven fabrics constituting the pant-type absorbent article 100 in the stretched state, or bond the rubber thread 110 between the nonwoven fabrics. The prepared member can be prepared and adhered to the pant-type absorbent article 100. Thereby, the expansion and contraction performance of the pant-type absorbent article 100 is improved, the fit feeling at the time of wearing is increased, and further, body fluid such as urine and blood is prevented from leaking to the outside.

  As a pants-type absorbent article, for example, Patent Document 1 includes an elastic member that forms a gather that is continuous over substantially the entire circumference of each peripheral edge at the peripheral edge of each of the waist opening and the pair of leg openings. At the peripheral edge of the opening and the peripheral edge of the leg opening, the welded joint between the side edge of the ventral side and the side edge of the back side is at least 1 cm in length of the welded joint. An intermittent joint having a non-welded portion at a substantially central portion in the width direction is disclosed which aims for good fit while maintaining a good wearing feeling and texture.

  For pants-type absorbent articles, the stretchability around the waist is important for ease of wearing and the fit of the feeling of wearing, but in the past, tightening with the thickness, number, and length (elongation rate) of rubber thread The main adjustment was strength. Therefore, for the purpose of further improving the fit at the time of wearing, often use gathers with an increased number of thread rubber, and in that case, a large amount of adhesive for bonding to the nonwoven fabric in order to increase the thread rubber As a result, the texture is hard and the touch is poor.

Japanese Patent Laid-Open No. 10-137287

  Accordingly, an object of the present invention is made in view of such a problem, and an object of the present invention is to provide a pant-type absorbent article that improves the wearing feeling and the fit.

(1) A pant-type absorbent article according to the present invention includes an exterior body formed in a pant form, and an interior body that is positioned on the skin contact surface side of the exterior body and absorbs body fluid. A body is provided with a ventral portion, a dorsal portion, a crotch portion provided so as to connect between the ventral portion and the dorsal portion, a top sheet in which the inner body comes into contact with the skin, and the exterior A back sheet that comes into contact with the body, and an absorbent body that is provided between the top sheet and the back sheet, and the abdomen and the dorsal side are the first nonwoven fabric and the stretchable material. A film and a second nonwoven fabric are formed from a composite sheet constituted by laminating and laminating in this order from the skin contact surface side, and the exterior body includes a side edge portion of the ventral side portion and a side of the back side portion. In the waistline formed by joining the edges, in the direction in which the upper edge of the waistline is folded outward And providing a gender elastic member.

(2) The pant-type absorbent article of the present invention is the pant-type absorbent article according to (1), wherein an extension load at 120% extension of the waist portion is 1.5 to 2.5 N / 50 mm width. It may be.

(3) The pant-type absorbent article of the present invention is the pant-type absorbent article according to (2), wherein an extension load at 150% extension of the waist portion is 3.5 to 7.5 N / 50 mm width. It may be.

(4) The pant-type absorbent article of the present invention is the pant-type absorbent article according to any one of (1) to (3), wherein the composite sheet around the waist is not stretched. The surface roughness Sa may be not less than 300 μm and not more than 500 μm, and may have a surface roughness Sa of not less than 100 μm and not more than 300 μm when stretched 150% in the expansion / contraction direction.

  The objective of this invention is made | formed in view of such a subject, The objective is to provide the underpants type absorbent article which improves a feeling of wear and fitting property.

It is the schematic which shows the underpants type absorbent article which concerns on embodiment of this invention. It is sectional drawing in the X-X 'line | wire of FIG. It is an expanded view of the underpants type absorbent article which concerns on embodiment of this invention. FIG. 4 is a cross-sectional view taken along line Y-Y ′ of FIG. 3. It is the schematic which shows the conventional pants type absorbent article.

  With reference to FIG. 1 thru | or FIG. 4, the underpants type absorbent article which concerns on embodiment of this invention, and its manufacturing method are demonstrated in detail. In the description of the embodiments, the same numbers are assigned to the same elements throughout. In the description of the present specification, the longitudinal direction of the pant-type absorbent article 1 is a direction extending before and after the wearer when the pant-type absorbent article 1 is worn, and the short direction of the pant-type absorbent article 1 is Means a direction transverse or orthogonal to the longitudinal direction. Further, in the description of the present specification, the body fluid refers to a liquid discharged from the body such as urine, blood, and water in loose stool. Furthermore, when the pants-type absorbent article 1 is worn, it means at least one of when the pants-type absorbent article 1 is worn and after. Moreover, although the paper diaper is demonstrated as an example as the pants-type absorbent article 1, other pants-type absorbent articles such as disposable shorts and incontinence disposable diapers may be used.

  1 is a schematic view showing a pant-type absorbent article according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line XX ′, and FIG. 3 is a pant according to an embodiment of the present invention. FIG. 4 is a development view of the mold absorbent article, and FIG. 4 is a cross-sectional view taken along line YY ′ of FIG. 3. One embodiment of the pant-type absorbent article 1 in the present invention will be described with reference to FIGS. As shown in FIGS. 1 to 4, the pant-type absorbent article 1 includes an abdominal side part 11, a back side part 12, and a crotch part 13 provided between the abdominal side part 11 and the back side part 12. The exterior body 10 which has the exterior body 10 which has, the top sheet 21, the back sheet 22, and the absorber 23 provided between the top sheet 21 and the back sheet 22, and is located in the skin contact surface side of the exterior body 10 20.

(Exterior body)
The pants-type absorbent article 1 is located on the non-skin contact surface side of the interior body 20, and is located on the stomach side (A side in FIG. 3) of the wearer, and on the back side (B side in FIG. 3). ) And the exterior body 10 formed in the form of the pants divided into the crotch part 13 provided so as to connect the back side part 12 located between them.

  In the exterior body 10, the trunk periphery 19 is formed by joining the side edge 31 of the ventral side 11 and the side edge 32 of the back side 12, and the upper edge 16 of the trunk periphery 19 is folded outward. An elastic stretchable member 17 is provided on the surface. The elastic elastic member 17 is formed of, for example, a sheet of thread rubber and nonwoven fabric. Moreover, it is preferable that the extension load at the time of 120% expansion | extension of the trunk periphery part 19 is 1.5-2.5N / 50mm width, and the extension load at the time of 150% expansion | extension is 3.5-7.5N / 50mm width. More preferably. By doing in this way, the double support of the composite sheet mentioned later and the elastic elastic member 17 is obtained, the fit property around a waist improves, and a user can use it more comfortably. As shown in FIG. 1 or 2, the waistline portion 19 may be bonded to the side edge portions (31, 32) of the abdominal side portion 11 and the back side portion 12, or may be integrally formed. Good.

  The abdominal side portion 11 and the back side portion 12 are formed by laminating the first nonwoven fabric 14, the stretchable film 15, and the second nonwoven fabric 14 by heat fusion or ultrasonic bonding in this order from the skin contact surface side. It is formed from a composed composite sheet. The crotch part 13 may be composed of a composite sheet similar to the ventral part 11 and the dorsal part 12, and uses the same material as the nonwoven fabric 14 described above, and uses the same processing method. You can also

  The stretchable film 15 is not particularly limited as long as it has stretchability, and examples thereof include films formed from polyester elastomers, polyolefin elastomers, polyurethane resins, polyamide resins, and the like. Among these, a polyurethane resin film is preferable from the viewpoint of cost and stretchability.

The composite sheet has an air permeability measured in accordance with JIS L 1096-A (Fragile method): 1990 of 20 cm ³ / cm ² · sec or more in a non-stretched state. If the air permeability is less than 20 cm ³ / cm ² · sec, it becomes easy to get stuffy when worn. The air permeability can be freely changed according to the thickness, density, weight per unit area of the nonwoven fabric fibers constituting the composite sheet, the opening area ratio of the opening provided in the stretchable sheet, and the like.

Further, the composite sheet has an air permeability measured based on JIS L 1096-A (Fragile method): 1990 of 50 cm ³ / cm ² · sec or more when stretched 150% in the stretching direction. Here, 150% stretched in the stretch direction is the ratio of the length in the stretched state to the natural length in the non-stretched state. That is, when a composite sheet having a natural length of 10 cm in a non-stretched state is stretched by 15 cm in the stretching direction, it is stretched by 15/10 × 100 = 150%. When the air permeability is less than 50 cm ³ / cm ² · sec, the portion used in the stretched state, for example, the portion around the buttocks is easily stuffy when worn.

  The composite sheet of the waistline portion 19 has a surface roughness Sa of 300 μm or more and 500 μm or less when not stretched, and has a surface roughness Sa of 100 μm or more and 300 μm or less when stretched 150% in the expansion / contraction direction. It is preferable. By setting it as the said range, it does not become flat too much, the surface is smooth, and the designability becomes favorable. The surface roughness Sa is a parameter obtained by extending Ra to three dimensions with respect to Ra of the amplitude average (two-dimensional) parameter in the height direction.

  The pant-type absorbent article 1 can be provided with a pair of left and right leg gathers 18 from the abdominal side portion 11 through the crotch portion 13 to the back side portion 12. The leg gathers 18 are formed by an elastic member 18a, for example, a sheet 18b made of thread rubber and nonwoven fabric. By providing the leg gather 18, not only the expansion / contraction direction (left / right direction when worn) but also the direction intersecting with the expansion / contraction direction (vertical direction when worn) can be expanded / contracted, and the fit around the inseam is improved. improves.

(Interior body)
The interior body 20 of the present embodiment is located on the skin contact surface side of the exterior body 10 and has a liquid-permeable top sheet 21 that contacts the skin, and a liquid-impermeable back sheet 22 that contacts the exterior body 10. In addition, an absorbent body 23 provided in a stacked manner between the top sheet 21 and the back sheet 22 and an interior body 20 that absorbs body fluids including the three-dimensional gathers 24 are provided. Thereby, the absorber 23 has a structure sandwiched between the top sheet 21 and the back sheet 22. The interior body 20 is disposed from the abdomen side portion of the exterior body 10 to the inside of the back side portion, and is fixed to the exterior body 10 at the crotch portion 13 of the exterior body 10. As the fixing method, for example, the outer body 10 is bonded by an adhesive such as hot melt, heat fusion, ultrasonic bonding, or the like.

The base material of the top sheet 21 of the present embodiment only needs to have liquid permeability so that the body fluid moves to the absorber 23. For example, a nonwoven fabric such as a thermal bond nonwoven fabric or a thermal bond / spun bond is laminated. It is formed from a material such as a composite nonwoven fabric, an open film such as an open polyethylene film, a foam film such as polyethylene foam or urethane foam, or a composite sheet obtained by laminating these films. The top sheet 21 is preferably embossed or perforated on the surface in order to improve liquid permeability. The processing method can perform a well-known method without a restriction | limiting. In order to reduce irritation to the skin, the top sheet 21 preferably contains a lotion, an antioxidant, an anti-inflammatory component, a pH adjuster, an antibacterial agent, a moisturizing agent and the like. Furthermore, the strength and processability of the point, the basis weight of the top sheet 21 is preferably 14 g / ^{m 2} or more 40 g / ^{m 2} or less. Although there is no restriction | limiting in particular as a shape of the top sheet 21, In order to guide liquids, such as urine, to the absorber 23, what is necessary is just the shape which covers the absorber 23. FIG.

  In addition, on the skin contact surface side of the top sheet 21, a three-dimensional gather 24 that prevents a pair of body fluids from leaking from both longitudinal portions of the crotch, that is, from the longitudinal front portion A to the longitudinal rear portion B is provided. Is preferred. The outer portion in the width direction of the three-dimensional gather 24 is fixed to the back sheet 22, and the inner portion in the width direction is not fixed to the top sheet 21, and the three-dimensional gather elastic member 24 a such as thread rubber and the nonwoven fabric along the longitudinal direction. By being formed of the sheet 24b, etc., it has an upright property and can be deformed so as to expand and contract in accordance with the body shape of the user.

  The base material of the back sheet 22 of the present embodiment may be any material as long as it has liquid impermeability so that the body fluid retained by the absorber 23 does not leak, and may be a nonwoven fabric, a resin film, or a composite in which these are laminated. It is formed from a material such as a sheet. The production method of the nonwoven fabric is not particularly limited, and for example, a spunbond or meltblown nonwoven fabric, or a composite nonwoven fabric obtained by laminating spunbond / meltblown, spunbond / meltblown / spunbond, and a composite material thereof can be considered. Examples of the resin film include polyester, polyvinyl alcohol, polyethylene, polypropylene, and a composite film of polyethylene and polypropylene. Moreover, in order to prevent the stuffiness at the time of mounting | wearing, it is preferable that the back seat | sheet 22 has moisture permeability. In order to provide moisture permeability, for example, a filler is added to the resin film of the base material, and the back sheet 22 is embossed for perforation.

  The base material of the absorbent body 23 of the present embodiment is not particularly limited as long as it is generally used for absorbent articles such as sanitary napkins, diapers, and urine pads. For example, fluff pulp, superabsorbent resin (Super) Absorbent Polymer (hereinafter referred to as “SAP”), and a hydrophilic sheet. Examples of fluff pulp include those obtained by defibrating non-wood pulp such as wood pulp, synthetic fiber, and polymer fiber into a cotton shape. Examples of the highly water-absorbing resin include sodium polyacrylate, and examples of the hydrophilic sheet include tissue, absorbent paper, and hydrophilic nonwoven fabric.

  The absorber 23 is configured as a single layer or a multilayer sheet using the above-described base material. Among these, those formed by mixing a hydrophilic fiber matrix of a fluff pulp web, such as a wood pulp fluff, with SAP particles are preferable. Further, in order to prevent leakage of SAP particles and stabilize the shape of the absorber 23, it is preferable to wrap the absorber 23 in a hydrophilic sheet (not shown) such as tissue. Further, it is preferable to emboss the surface of the absorbent body 23 because the diffusion of the body fluid is controlled and the absorbent body 23 is easily deformed according to the body shape of the user.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited by the following examples.

(Examples and comparative examples)
A disposable diaper was used as the pant-type absorbent article. Air-through nonwoven 30 g / m ² as a topsheet, using a breathable polyethylene film 32 g / m ² as a backsheet, between the topsheet and the backsheet, fluff pulp 12g, water-absorbing polymers consisting of polyacrylic acid resin An absorber made of 11 g of a mixture was arranged to make an interior body. Two pieces of 940 decitex urethane thread rubber extending in the longitudinal direction on both sides of the interior body, each extending to 200%, were arranged to form underbody gathers. A 20 μm thick urethane film having an opening ratio of 14% is laminated between two layers of 20 g / m ² polypropylene spunbonded nonwoven fabric in a 250% stretched state, and is a pattern extending linearly in a direction perpendicular to the stretching direction. A laminated body (composite sheet) having stretchability and breathability was formed by ultrasonic bonding over the entire region to obtain an exterior body. A composite body comprising six 940 decitex urethane thread rubber stretched 200% is placed at the waistline end of the exterior body, and the upper end of the exterior body is folded back 30mm outside so as to sandwich the rubber thread around the waistline gather. It was. Moreover, about the comparative example, the commercial item which comprised the abdominal side part and the back side part with the member which adhere | attached thread rubber between the nonwoven fabrics was used.

(Surface roughness Sa)
The surface roughness Sa of the trunk periphery shown in the examples and comparative examples was performed by the following measuring method. Non-skin contact surface of a test piece for measurement obtained by cutting the abdomen from the pant-type absorbent article of Example or Comparative Example using “One-shot 3D measurement macroscope VR-3100” manufactured by Keyence Corporation The maximum value, the minimum value, and the average value were obtained with respect to the surface roughness Sa value by image analysis software (VR-H1A). The surface roughness Sa value is an index that indicates flatness as the value is smaller, with less unevenness. In addition, the experiment was performed in five steps, with the measurement conditions being a visual field area: 24 mm × 18 mm, and the test piece being in two points: a non-stretched state and a 150% stretched state in the stretch direction. Further, the test piece was fixed with an embroidery frame in order to extend 150% in the stretching direction. The results are shown in Table 1.

  As shown in Table 1, the pants-type absorbent articles of the examples have lower surface roughness Sa values than the comparative examples, so that the non-skin contact surface side feel of the abdomen and the dorsal side is like underwear. It was smooth and wrinkles were inconspicuous and had a soft appearance. Moreover, even if it was in the state extended | stretched 150% in the expansion-contraction direction, the external appearance and the touch of the underpants type absorbent article of an Example were favorable, and when attaching | detaching | attaching, the good touch of a finger was able to be given.

  As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in the said embodiment and embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be made to the above embodiment. Further, it is apparent from the description of the scope of claims that embodiments with such changes or improvements can also be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Pants type absorbent article 10 Exterior body 11 Abdomen side part 12 Back side part 13 Crotch part 14 Nonwoven fabric 15 Elastic film 16 Upper edge part 17 Elastic elastic member 18 Leg gathers 19 Trunk part 20 Interior body 21 Top sheet 22 Back sheet 23 Absorber 24 Solid Gather 31 Side Edge (Ventral Side)
32 Side edge (back side)

Claims (5)

A method for manufacturing a pant-type absorbent article,
The pant-type absorbent article is
An exterior body formed in the form of pants;
An interior body that is located on the skin contact surface side of the exterior body and absorbs body fluids;
With
The exterior body is
The ventral side,
The dorsal side,
A crotch portion provided so as to connect between the ventral side portion and the dorsal side portion ,
The interior body is
A top sheet that contacts the skin;
A back sheet in contact with the exterior body;
An absorber provided by being laminated between the top sheet and the back sheet,
The ventral part and the dorsal part are formed from a composite sheet constituted by laminating and laminating the first nonwoven fabric, the stretchable film and the second nonwoven fabric in this order from the skin contact surface side,
The stretchable film is a urethane film having an opening,
When the composite sheet has an air permeability of 20 cm 3 / cm 2 · sec or more as measured in accordance with JIS L 1096-A (Fragile method): 1990 and stretched 150% in the stretch direction in a non-stretched state. , JIS L 1096-A (Fragile method): measured according to 1990, having an air permeability of 50 cm 3 / cm 2 · sec or more,
In the waist part formed by joining the side edge part of the abdominal side part and the side edge part of the back side part, the exterior body,
An elastic elastic member is provided in a direction in which the upper edge of the waistline portion is folded outward,
The manufacturing method of the pants-type absorbent article is formed by laminating the stretchable film between the first nonwoven fabric and the second nonwoven fabric in a stretched state, and extending in a pattern extending linearly in a direction perpendicular to the stretch direction. over by ultrasonic bonding method for producing a pants-type absorbent article that comprises said that to form a composite sheet process which constitutes the outer package.   The manufacturing method of the underpants type absorbent article of Claim 1 whose 1st nonwoven fabric and 2nd nonwoven fabric are polypropylene spun bond nonwoven fabrics.   2. The method for producing a pants-type absorbent article according to claim 1, wherein an extension load at the time of 120% extension of the waist portion is 1.5 N / 50 mm width to 2.5 N / 50 mm width.   The method for producing a pants-type absorbent article according to claim 3, wherein an extension load at the time of 150% extension of the waist portion is 3.5 N / 50 mm width to 7.5 N / 50 mm width. The composite sheet around the waist is
The surface roughness Sa is 300 μm or more and 500 μm or less when not stretched,
The method for producing a pants-type absorbent article according to any one of claims 1 to 4, wherein the pants-type absorbent article has a surface roughness Sa of 100 µm or more and 300 µm or less when stretched 150% in the stretching direction.

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