TW201600071A - Disposable diaper - Google Patents

Abstract

In this disposable diaper (1), the outer sheet (51) of the facing material (5) forming the outer surface of the disposable diaper (1) is made of spunbonded nonwoven fabric. The spunbonded nonwoven fabric of the outer sheet (51) has a basis weight of 19 g/m2 or less. The spunbonded nonwoven fabric of the outer sheet (51) also has a mean deviation (SMD) of surface roughness of 3.20 [mu]m or less. The spunbonded nonwoven fabric of the outer sheet (51) also has a mean deviation (MMD) of the coefficient of friction 0.0085 or less. Additionally, the spunbonded nonwoven fabric of the outer sheet (51) has an MD bulk softness of 5.0 cN or less.

Description

Disposable diaper

This invention relates to a disposable diaper.

In an absorbent article such as a disposable diaper, a spunbonded nonwoven fabric is used in one of the constituent members. In general, spunbonded nonwoven fabrics are characterized by low cost, low rigidity, and inelasticity, but most of the smoothness or softness is poor. For example, Patent Document 1 describes a spunbonded nonwoven fabric which can be preferably used as a surface material of a disposable diaper. Further, Patent Document 2 discloses a disposable diaper in which a spunbonded nonwoven fabric is used for an outer casing of a pant-type disposable diaper.

When the spunbonded nonwoven fabric described in Patent Document 1 is used for a surface material to form a disposable diaper, cost can be suppressed. Further, according to the pants-type disposable diaper described in Patent Document 2, since the outer casing is made of a spunbonded nonwoven fabric, the cost can be suppressed, and the spunbonded nonwoven fabric described in Patent Document 2 is formed by containing a surfactant, so that smoothness is obtained. improve.

In addition to this, the present applicant has previously disclosed a non-woven fabric which is a constituent material for the outermost surface of the disposable diaper, which is a nonwoven fabric which defines the average deviation of the surface roughness and the average deviation of the friction coefficient (Patent Document 3).

Prior technical literature Patent literature

Patent Document 1: Japanese Patent Laid-Open No. 2001-146674

Patent Document 2: Japanese Patent Laid-Open Publication No. 2010-273960

Patent Document 3: Japanese Patent Laid-Open No. 2006-233364

The present invention relates to a disposable diaper comprising: a longitudinally-shaped absorbent body comprising a front sheet, a back sheet, and an absorbent body disposed between the sheets; and an exterior body, It is disposed on the non-skin facing side of the absorbent body. The outer casing has an outer layer sheet forming the outer surface of the disposable diaper, and the outer layer sheet is composed of a spunbonded nonwoven fabric. The spunbonded nonwoven fabric has a basis weight of 19 g/m ² or less, an average deviation SMD of surface roughness of 3.20 μm or less, an average deviation MMD of the friction coefficient of 0.0085 or less, and an MD bulk softness of Below 5.0cN.

1‧‧‧Disposable diapers

2‧‧‧Front sheet

3‧‧‧Back sheet

4‧‧‧Acceptor

5‧‧‧Outer body

5a1‧‧‧lateral edge

5A‧‧‧ Ventral external body

5b1‧‧‧lateral edge

5B‧‧‧Back side outer body

5C‧‧‧ Under the outer body

6‧‧‧Front side flange

10‧‧‧Absorbable ontology

10a‧‧‧End

10b‧‧‧End

10s‧‧‧ side edge

21‧‧‧ bump roll

22‧‧‧ bump roller

23‧‧‧Steel matching embossing roller

24, 25‧‧‧Transport roller

31‧‧‧protrusion roller

32, 33‧‧‧Transport roller

51‧‧‧ outer sheet

51M‧‧‧Material non-woven fabric

51M'‧‧‧Materials that have been damaged are not woven

51R‧‧‧Inner sheet

52‧‧‧ Inner sheet

53‧‧‧Flexible components

54‧‧‧Outer body fusion department

54P‧‧‧ Fusion Department

54S‧‧‧ Fusion Department

55‧‧‧Outer fixed area

56‧‧‧ Body-side fixed area

57‧‧ pleats

58‧‧‧ Hollow

61‧‧‧Elastic members for forming three-dimensional pleats

100‧‧‧Processing device

200‧‧‧Partial Extension Processing Department

210‧‧‧ convex

220‧‧‧ recess

300‧‧‧Fauring Processing Department

310‧‧‧ convex

A‧‧‧ Ventral area

B‧‧‧Back side area

C‧‧‧胯下区域

CL‧‧‧ vertical center line

d, u‧‧‧ fusion department

G1‧‧‧ waist flexure

G2‧‧‧Waist expansion joint

JT‧‧‧Local joint area

L1‧‧‧ length

L2‧‧‧ length

L3‧‧‧ length

L4‧‧‧ length

L5‧‧‧ length

L6‧‧‧ distance

L7‧‧‧ interval

LO‧‧‧ leg opening

M‧‧‧ gap

S‧‧‧Side seal

WO‧‧‧Low opening

X‧‧‧ direction

Y‧‧‧ direction

Fig. 1 is a perspective view showing a state of use (wearing state) of a pant-type disposable diaper according to an embodiment of the present invention.

Fig. 2 is a developed plan view showing a state in which the diaper shown in Fig. 1 is unfolded and stretched from the skin contact surface side.

Fig. 3 is a schematic view showing a preferred processing apparatus used for raising a spunbonded nonwoven fabric.

Fig. 4 is a schematic view showing a partially extended processed portion of the processing apparatus shown in Fig. 3 from an oblique direction.

Fig. 5 is a schematic view showing the raising portion of the processing apparatus shown in Fig. 3 from an oblique direction.

Fig. 6 is an enlarged plan view showing the fused portion of the diaper shown in Fig. 1 and an external fusion portion constituting the fused portion.

Fig. 7 is an enlarged cross-sectional view showing a cross section of a waist stretchable portion in the diaper shown in Fig. 1 in a lateral direction.

Fig. 8 is an enlarged cross-sectional view showing a cross section of a waist elasticized portion of the diaper shown in Fig. 1 in a lateral direction.

However, in Patent Document 1, as a property required for the spunbonded nonwoven fabric, The view of slippery, drape, and fluffy similar cloth is not described. Therefore, when the spunbonded nonwoven fabric described in Patent Document 1 is used as a constituent material of the outermost surface of the disposable diaper, the skin feel is inferior and the quality of the product is lowered.

Further, the spunbonded nonwoven fabric described in Patent Document 2 is formed by including a surfactant, and therefore, the smoothness of one of the main causes of the similar cloth is improved. However, in Patent Document 2, the necessity of other similar cloths is not made. Any record. Therefore, when the spunbonded nonwoven fabric described in Patent Document 1 is used as a constituent material of the outermost surface of the disposable diaper, the touch of the skin is uncomfortable, and the quality of the product is lowered.

Further, the non-woven fabric used as the constituent material of the outermost surface of the disposable diaper described in Patent Document 3 is a hot air non-woven fabric, and it is difficult to keep the cost low. Further, in Patent Document 3, the spunbonded nonwoven fabric satisfying the viewpoint of similar cloth is not described.

Accordingly, the present invention provides a disposable diaper that eliminates the disadvantages of the prior art described above.

Hereinafter, the present invention will be described with reference to the drawings based on preferred embodiments thereof. As shown in Fig. 1 and Fig. 2, the disposable diaper 1 of the present embodiment is a diaper comprising a vertically long absorbent body 10 having a liquid permeable front sheet 2 and a liquid liquid. The transparent back sheet 3 and the absorbent body 4 disposed between the two sheets 2 and 3, and the exterior body 5 are disposed on the non-skin opposing surface side of the absorbent body 10. In the present embodiment, the diaper 1 is divided into a ventral side portion disposed on the ventral side of the wearer, a back side portion disposed on the back side, and a lower portion positioned between the diaper, and the lower portion thereof. Both side edges of the side portions are joined to both side edges of the back side portion to form a pair of side seal portions S, S. Specifically, the diaper 1 is a pants-type disposable diaper, and the exterior body 5 is divided into a ventral outer casing 5A disposed on the ventral side of the wearer, and a back side outer casing 5B disposed on the back side. And the underarm outer casing 5C disposed in the crotch region between the 5A and 5B as different members, and the both side edges 5a1 and 5a1 of the front outer casing 5A and the back outer casing 5B The side edge portions 5b1 and 5b1 are joined to each other to form a pair of side seal portions S and S, a waist opening portion WO, and a pair of leg opening portions LO and LO.

As shown in Fig. 2, the diaper 1 has a longitudinal direction (X direction) corresponding to the front and rear directions of the wearer and a lateral direction (Y direction) orthogonal to the longitudinal direction (X direction) when the diaper 1 is stretched in a plan view. Further, the diaper 1 is divided into a ventral region A disposed on the ventral side of the wearer when worn, a back side region B disposed on the back side of the wearer when worn, and a ventral region in the longitudinal direction (X direction). The underarm region C between A and the back side region B. Further, in the present specification, the skin-facing diaper 1 or a member thereof (for example, the absorbent body 10) faces the side of the wearer's skin when worn, and the non-skin-facing diaper-type disposable diaper 1 Or a component on the opposite side (dressing side) facing the skin side of the wearer when worn. In the diaper 1, the longitudinal direction (X direction) coincides with the direction of the long side of the diaper 1 or the absorbent body 10 as a constituent member thereof, and the transverse direction (Y direction) and the disposable diaper or the absorbent body 10 as a constituent member thereof. The width direction is the same.

Further, the diaper 1 has a bilaterally symmetrical shape with respect to the longitudinal center line CL extending in the longitudinal direction (X direction). Therefore, in the following description, only one of the left and right symmetrical portions will be mainly described.

In addition, the state in which the diaper 1 is unfolded and stretched means that the side seal portion S is peeled off, and the diaper 1 is brought into an unfolded state, and the elastic members of the respective portions of the diaper 1 in the unfolded state are elongated. And extended to become the design size (same size as when expanding in a planar manner in a state where the elastic member is completely excluded).

As shown in Fig. 2, the absorbent body 10 has a longitudinally long shape in one direction (longitudinal direction (X direction)). The absorbent main body 10 includes a liquid-permeable front sheet 2 which forms a skin facing surface, and a liquid-impermeable (also including water-repellent) back sheet 3 which forms a non-skin opposing surface; and liquid retention The absorber 4 is interposed between the two sheets 2 and 3. Further, as shown in Fig. 2, side flanges 6, 6 having elastic members arranged in an elongated state in the longitudinal direction (X direction) are provided on both sides in the longitudinal direction (X direction) of the absorbent body 10. Specifically, the side flange 6 includes a liquid impervious or water-repellent and gas permeable material, and a three-dimensional wrinkle is disposed in a state of being elongated in the longitudinal direction (X direction) in the vicinity of the free end portion of each side flange 6 The elastic member 61 for forming. When the diaper is worn, the free end side of the side burr 6 rises due to the contraction of the three-dimensional pleat forming elastic member 61, and becomes a so-called three-dimensional pleat, and prevents the body fluid from flowing out in the lateral direction (Y direction).

The absorbent body 10 configured as described above is formed such that its longitudinal direction (X direction) coincides with the longitudinal direction (X direction) of the diaper 1 in an unfolded and stretched state, and is joined to the central portion of the exterior body 5 by an adhesive. In this manner, the exterior body 5 is disposed and then fixed to the non-skin opposing surface side of the back sheet 3 constituting the absorbent body 10 in the thickness direction (Z direction) of the disposable diaper 1. Specifically, the diaper 1 outer casing 5 is composed of a different member as a front outer casing 5A located in the front side region A, a rear outer casing 5B located in the back side region B, and The underarm outer casing 5C is located in the crotch region C between the abdominal cavity outer casing 5A and the rear outer casing 5B, and is divided into a belly outer casing 5A and a rear outer casing. 5B and underarm outer body 5C. In the outer casing 5, the front outer casing 5A and the rear outer casing 5B are joined to each other and integrally formed at both ends in the longitudinal direction (X direction) of the underarm outer casing 5C. The absorbent body 10 is joined to the center portion in the lateral direction (Y direction) of the exterior body 5 formed in this manner, and the absorbent body 10 is disposed from the front outer casing 5A and the back outer casing 5B.

The outer casing 5 has an outer layer sheet 51 which forms the outer surface of the disposable diaper 1, and the outer layer sheet 51 is formed of a spunbonded nonwoven fabric. Specifically, both the front outer casing 5A and the back outer casing 5B in the diaper 1 are formed in the lateral direction (Y direction) in the expanded state (see FIG. 2) as shown in FIG. 2 . Long rectangular shape. Each of the front outer casing 5A and the back outer casing 5B in the diaper 1 includes an outer layer sheet 51 which forms the outer surface of the diaper 1, and an inner surface side which is disposed on the inner surface side of the outer layer sheet 51 and which forms the inner surface of the diaper 1. The inner layer sheet 52 is formed, and further includes a plurality of linear elastic members 53 disposed between the outer layer sheet 51 and the inner layer sheet 52 in a state in which the diaper 1 is stretched in the lateral direction (Y direction). Composition. The front outer casing 5A and the back outer casing 5B are preferably the outer layer sheet 51 and the inner layer sheet by a bonding method such as heat sealing, high-frequency sealing or ultrasonic sealing, or a bonding method such as an adhesive. 52 is formed by partial joining between the parts, and the outer part fusion part 54 is partially connected to the diaper 1 by fusion. Hehe. In the diaper 1, the outer layer sheet 51 of each of the front outer casing 5A and the back outer casing 5B is formed of a spunbonded nonwoven fabric.

The underarm outer casing 5C in the diaper 1 is formed of one sheet (outer layer sheet 51) forming the outer surface of the diaper 1. The underarm outer casing 5C covers a portion of the crotch region C in the back sheet 3 constituting the absorbent body 10. The side edges of the armpit outer casing 5C in the longitudinal direction (X direction) of the diaper substantially coincide with the side edges in the longitudinal direction (X direction) of the back sheet 3 constituting the absorbent body 10, and the underarm outer casing 5C is formed. It is rectangular. In the diaper 1, the outer layer sheet 51 of the underarm outer casing 5C is formed of a spunbonded nonwoven fabric.

The spunbonded nonwoven fabric of the outer layer sheet 51 is a non-woven fabric that satisfies all of the following requirements (1) to (4), and preferably satisfies all of the following necessary conditions (1) to (5). . The details will be described below.

The spunbonded nonwoven fabric of the outer layer sheet 51 has a basis weight (necessary condition (1)) of 19 g/m ² or less, preferably 18 g/m ² or less, from the viewpoint of reducing rigidity. Further, the lower limit of the basis weight of the spunbonded nonwoven fabric is preferably 10 g/m ² or more.

In the spunbonded nonwoven fabric of the outer layer sheet 51, the average deviation SMD (required condition (2)) of the surface roughness is 3.20 μm or less, preferably 3.1 μm or less, and more preferably 3.0 μm or less. In addition, the lower limit of the average deviation SMD of the surface roughness of the spunbonded nonwoven fabric is preferably as close as possible to 0, but if it is 0.5 μm or more, sufficient smoothness can be imparted to the nonwoven fabric.

Regarding the spunbonded nonwoven fabric of the outer layer sheet 51, the average deviation MMD (necessary condition (3)) of the friction coefficient is 0.0085 or less, preferably 0.0075 or less. In addition, as the lower limit of the average deviation MMD of the friction coefficient of the spunbonded nonwoven fabric, the closer to 0, the better, but if it is 0.003 or more, sufficient smoothness can be imparted to the nonwoven fabric.

The average deviation SMD of the surface roughness and the average deviation MMD of the friction coefficient were measured using KESISB4-AUTO-A (trade name) manufactured by Kato Tech Co., Ltd. according to the method described in the following book. Specifically, the measurement was carried out by the following method.

Kawabata Hiroshi, "Standardization and Analysis of Handle Evaluation", 2nd Edition, Research Institute of Hand-Measured and Normalized Research of Japan Fiber Machinery Society, Showa 55 (1980) issued on July 10

[Measurement method of average deviation SMD of surface roughness]

A 20 cm × 20 cm test piece (outer layer sheet 51) was prepared and mounted on a test stand of a smooth metal plane. The contact piece was pressure-bonded to the test piece with a force of 9.8 cN (within an error of ±0.49 cN). The test piece was horizontally moved by 2 cm at a fixed speed of 0.1 cm/sec. The test piece was given a uniaxial tension of 19.6 cN/cm. The contact member was obtained by bending a piano wire having a diameter of 0.5 mm into a U shape with a width of 5 mm, and crimping the test piece with a force of 9.8 cN. The contacts are crimped by a spring. The constant of the spring is set to 24.5 cN/mm (within an error of ±0.98 cN/mm or less), and the resonance frequency is set to 30 Hz or more in a state of being in contact with the surface. The measured value of the average deviation of the surface roughness is represented by the SMD value. This measurement was performed in MD (Machine Direction) and CD (cross direction), and the average value was obtained from the following formula (1), and this was made into the average deviation SMD of surface roughness.

Average deviation of surface roughness SMD={(SMD _MD ² +SMD _CD ² )/2} ^1/2 ...(1)

[Measurement method of mean deviation MMR of friction coefficient]

A 20 cm × 20 cm test piece (outer layer sheet 51) was prepared and mounted on a test stand of a smooth metal plane. The contact surface of the contact member was crimped to the test piece with a force of 49 cN, and the test piece was horizontally moved by 2 cm at a fixed speed of 0.1 cm/sec. The test piece was given a uniaxial tension of 19.6 cN/cm. The contact piece is obtained by juxtaposing 20 piano wires having a diameter of 0.5 mm which are the same as those used for the measurement of the surface roughness, and bending it into a U shape with a width of 10 mm, and pressing the contact surface with a weight of 49 cN by a weight. Connected to the test piece. The measured value of the average deviation of the friction coefficient is expressed by the MMD value. This measurement was performed on both MD and CD, and the average value was calculated from the following formula (2), and this was made into the mean deviation MMD of the friction coefficient.

Average deviation of friction coefficient MMD={(MMD _MD ² +MMD _CD ² )/2} ^1/2 ...(2)

Regarding the spunbonded nonwoven fabric of the outer layer sheet 51, its MD fluffy softness (required condition (4)) It is 5.0 cN or less, preferably 4.0 cN or less, and more preferably 3.5 cN or less. Further, the lower limit of the bulkiness of the MD of the spunbonded nonwoven fabric is preferably as close as possible to 0. However, if it is 0.5 cN or more, sufficient drapability can be imparted to the nonwoven fabric. MD fluffy softness was measured by the following assay.

[Method for measuring the softness of MD fluff]

The MD fluffy softness is set at a temperature of 22 ° C and 65% RH, and the outer layer sheet 51 is cut 150 mm in the CD direction along the alignment direction of the constituent fibers, and cut 30 mm in the MD direction orthogonal to the CD direction. The ring has a diameter of 45 mm, and the end portion is fixed at two upper and lower portions using a stapler. At this time, the core of the stapler becomes longer in the CD direction. Using a tensile tester (for example, Tensilon tensile tester "RTA-100" manufactured by Orientec Co., Ltd.), the ring was erected on a sample stage in a cylindrical shape, and the flat plate was measured at a compression speed of 10 mm from above using a plate substantially parallel to the table. The maximum load at the time of compression at /min speed, and the measured value in the MD direction is MD fluffy softness.

The spunbonded nonwoven fabric of the outer layer sheet 51 preferably has a compression characteristic value (required condition (5)) at a minute load of 15.0 (gf/cm ² )/mm or less, and more preferably 14.0 (gf/cm ² ). Below /mm, it is particularly preferably 13.0 (gf/cm ² )/mm or less. In addition, as the lower limit of the compression characteristic value at the time of the minute load of the spunbonded nonwoven fabric, the closer to 0 is preferable, but if it is 1.0 (gf/cm ² )/mm or more, a sufficient bulkiness can be imparted to the nonwoven fabric. The compression characteristic value at the time of the minute load was measured by the following measurement method.

[Determination of compression characteristic values at minute loads]

The measurement which is the basis of the calculation of the compression characteristic value at the time of the micro load is measured using an KES FB3-AUTO-A (trade name) manufactured by Kato Tech Co., Ltd. in an environment of 22 ° C and 65% RH. Specifically, the outer layer sheet 51 was cut into three pieces at 20 cm × 20 cm to prepare a sample for measurement. Next, one of the measurement samples was placed on a test stand. Next, compression was performed between steel sheets having a circular plane of 2 cm ² . The measurement was carried out at the same speed at a compression speed of 20 μm/sec, a maximum compression load of 10 gf/cm ² , and a recovery process. At this time, the shift amount between the steel sheets was set to x (mm), the load was set to y (gf/cm ² ), and the position at which the load was detected was set to x = 0, and the measurement was performed in the compression direction. The value of x is more compressed as it is compressed.

The compression characteristic value at the time of the minute load is calculated from the amount of deformation of the thickness when the minute load is selected from the measured data (x, y). Specifically, the lottery is not the first load of the recovery process, the load between 0.30 gf/cm ² and 1.00 gf/cm ² and the amount of deformation at this time, regarding the relationship between x and y, by least The method calculates an approximate straight line, and sets the slope at this time to the above characteristic value (unit (gf/cm ² )/mm). Three sites were measured on one measurement sample. A total of nine sites of three samples were measured. The characteristic values of the nine parts were calculated, and the average value of the same was set as the compression characteristic value at the time of the minute load of the non-woven fabric.

The spunbonded nonwoven fabric of the outer layer sheet 51 is preferably formed of a propylene-based polymer as a polyolefin-based polymer from the viewpoint of being a soft nonwoven fabric. The propylene-based polymer is preferably a propylene-based polymer having a molecular weight distribution (Mn/Mn) of 1.5 or more and 3.5 or less. Further, from the viewpoint of a smooth and soft non-woven fabric, the propylene-based polymer preferably contains a resin containing 5 to 100% by weight, more preferably 25% by weight to 80% by weight, of the following resin. Any one or more of a copolymer, a homopolymer, and a block copolymer. Further, the copolymer or the homopolymer may be mixed, or other resins may be mixed, or a mixture of a homopolymer of a polypropylene and a random copolymer may be used. Further, the random copolymer based on the propylene component is preferably copolymerized with ethylene or an α-olefin, and particularly preferably an ethylene propylene random copolymer. The propylene-based polymer is preferably a polymer containing 5 to 100% by weight of an ethylene propylene random copolymer as a main component, and more preferably 25% by weight or more of a polymer. In the ethylene propylene random copolymer, the ethylene content is preferably 2.0 mol% or more and 10.0 mol% or less, and the ethylene content is more preferably 3.0 mol% or more and 8.0 mol% or less. Further, the propylene polymer is preferably a polymer containing 25% by weight or more of a recycled polypropylene resin from the viewpoint of the environment, and more preferably a polymer containing 50% by weight or more.

In the spunbonded nonwoven fabric of the outer layer sheet 51, the content of the crimped long fibers is preferably 30% by mass or more, and more preferably 40% by mass or more, from the viewpoint of morphological stability. It is preferably 100% by mass or less, and more preferably 90% by mass or less. Specifically, from the viewpoint of flexibility and form stability, it is preferably 30% by mass or more and 100% by mass or less. It is preferably 40% by mass or more and 90% by mass or less.

Here, the crimped long fiber is, for example, melt-spun the thermoplastic resin, and the melt-spun filament is cooled by cooling air at different temperatures from left to right or front and rear, or from one side to the cooling wind. And cooling, or a filament obtained by melt-spinning into a filament of a profiled section fiber or an eccentric hollow fiber or a filament obtained by composite melt spinning of a polymer having a different melting point to form a crimped fiber. The crimped long fibers are obviously crimped long fibers which usually have a crimp number of preferably 10 / 25 mm or more, more preferably 15 / 25 mm or more, and particularly preferably 20 / 25 mm or more. Usually, the fiber diameter of the apparently crimped long fiber is preferably in the range of 0.5 d or more and 5.0 d or less, and more preferably in the range of 0.5 d or more and 3.0 d or less. Further, the number of crimps of the crimped long fibers was measured by the following measurement method.

[Measurement of the number of crimps of crimped long fibers (pieces / 25 mm)]

A paper with a smooth and shiny surface is drawn with a line spacing of 25 mm. Then, the crimped long fibers of the long fiber web which are carefully selected from the long-fiber web before being subjected to the heat and pressure treatment by the embossing roller in a manner not impairing the crimping property have a relaxation of 25 ± 5% with respect to the spatial distance, and The both ends are attached to the paper sheets by an adhesive. The samples were attached to the jig of the crimping tester one by one, and after the paper sheets were cut, the distance (space distance) (mm) between the jigs when the initial load (0.18 mN × display texture number) was applied to the samples was measured. Then, the number of crimps at this time is calculated, and the number of crimps per 25 mm is obtained. Regarding the number of crimps, all mountains and valleys are calculated, and one-half of the number is set to the number of crimps. The number of crimps is obtained by taking only the crimped long fibers from the nonwoven fabric and measuring 20, and the value obtained by obtaining the average value to one decimal place is the number of crimps. Furthermore, the measurement of the number of crimps is based on JIS (Japanese Industrial Standards, Japanese Industrial Standards) Z8703 (standard state of the test site) is implemented in a constant temperature room with a temperature of 20 ± 2 ° C and a humidity of 65 ± 2%.

The spunbonded nonwoven fabric of the outer layer sheet 51 preferably has a breaking strength in a direction orthogonal to the direction in which the fibers are aligned, from 7.0 N/50 mm or more, from the viewpoint of preventing breakage during use and processing suitability. It is preferably 8.0 N/50 mm or more, and more preferably 30.0 N/50 mm or less, and specifically, preferably 7.0 N/50 mm or more and 30.0 N/50 mm or less, and more preferably 8.0 N/50 mm or more. 30.0N/50mm or less. The breaking strength was measured by the following measurement method.

[Measurement method of breaking strength]

The outer layer sheet 51 was cut into a rectangular shape having a diameter of 50 mm in the direction of the CD constituting the fibers in the direction of the CD in the direction of the CD, and a rectangular shape of 200 mm in the MD direction orthogonal to the CD direction was observed in an environment of 22 ° C and 65% RH. The cut piece to be measured was set as a measurement sample. The measurement sample was attached to a chuck of a tensile tester (for example, Tensilon tensile tester "RTA-100" manufactured by Orientec Co., Ltd.) so that the MD direction became the stretching direction. Furthermore, the inter-jaw is set to 150 mm. Further, the measurement sample was stretched at a speed of 300 mm/min, and the maximum load focus until the measurement sample was broken was set to the breaking strength in the direction (MD direction) orthogonal to the direction in which the fibers of the constituent fibers were aligned.

The spunbonded nonwoven fabric of the outer layer sheet 51 has a plurality of heat-fusible portions which fix the constituent fibers and constitute a spunbonded nonwoven fabric. The area of each of the plurality of heat fusion portions is preferably 0.3 mm ² or less, more preferably 0.1 mm ² or more and 0.25 mm ² or less, particularly preferably 0.1 mm, from the viewpoint of being soft and having a good touch. ² or more and 0.2 mm ² or less. The number of the heat fusion portions is preferably 10 pieces/cm ² or more and 250 pieces/cm ² or less, and more preferably 35 pieces/cm ² or more and 65 pieces/cm ² or less.

In addition, the spunbonded nonwoven fabric of the outer layer sheet 51 has a ratio of the total area of the plurality of heat-fusible portions to the surface area of one surface (embossing ratio) from the viewpoint of a nonwoven fabric which is soft and has a good touch. It is preferably 15% or less, further preferably 5% or more and 13%. Hereinafter, it is particularly preferably 6% or more and 11% or less.

The heat-fusible portion of the spunbonded nonwoven fabric constituting the outer layer sheet 51 may be formed by intermittently forming by embossing (using an embossing convex roller or a smoothing roller or the like) or by ultrasonic fusion. A person who intermittently applies hot air and partially fuses the resultant. Among them, it is preferable that the fiber is broken by the thermocompression bonding. The shape of the heat fusion portion is not particularly limited, and may be any shape such as a circle, a rhombus or a triangle.

Regarding the spunbonded nonwoven fabric of the outer layer sheet 51, it is preferable to carry out the raising treatment from the viewpoint of improving the touch of the skin. In the case where the spunbonded nonwoven fabric is subjected to the raising treatment, for example, the processing apparatus 100 is used as shown in FIG. 3, and the processing apparatus 100 includes the partial extension processing section 200 and the raising processing disposed on the downstream side of the partial extension processing section 200. Department 300.

The partial extension processing unit 200 is a portion that performs partial extension processing on a plurality of portions of the raw material nonwoven fabric 51M of the spunbonded nonwoven fabric of the outer layer sheet 51, and the processing apparatus 100 includes a pair as shown in FIGS. 3 and 4 The steel of the embossing rolls 21, 22 is matched to the embossing roll 23. The pair of embossing rolls 21 and 22 are made of a metallic cylindrical shape such as an aluminum alloy or a steel. The steel matching embossing roller 23 is formed such that a plurality of convex portions 210 provided on the circumferential surface of the uneven roller 21 and a plurality of concave portions 220 provided on the circumferential surface of the uneven roller 22 are meshed with each other, and the plurality of convex portions 210 are respectively The uneven roller 21 is uniformly and regularly arranged in the direction of the rotation axis and the circumferential direction. The partial extension processing unit 200 is provided with conveyance rollers 24 and 25 that convey the raw material nonwoven fabric 51M on the upstream side and the downstream side of the steel matching embossing roller 23.

The height of each convex portion 210 of the uneven roller 21 from the peripheral surface of the uneven roller 21 to the apex of the convex portion 210 is preferably 1 to 10 mm, and more preferably 2 to 7 mm. The distance (pitch) between the convex portions 210 adjacent to each other in the direction of the rotation axis is preferably 0.01 to 20 mm, more preferably 1 to 10 mm, and the distance (pitch) between the convex portions 210 adjacent in the circumferential direction is preferably 0.01 to 20 mm, and more preferably 1 to 10 mm. The shape of the top surface of each convex portion 210 of the uneven roller 21 is not particularly limited. For example, a circular shape, a polygonal shape, a circular shape, or the like may be used, and the area of the top surface of each convex portion 210 is preferably 0.01 to 500 mm ² . Good for 0.1~10mm ² . Each of the concave portions 220 of the uneven roller 22 is disposed at a position corresponding to each convex portion 210 of the uneven roller 21. The depth of engagement between each convex portion 210 of the uneven roller 21 and each concave portion 220 of the uneven roller 22 (the length of a portion where each convex portion 210 overlaps each concave portion 220) is preferably 0.1 to 10 mm, and more preferably 1 to 5 mm.

As shown in FIG. 3 and FIG. 5, the raised portion 300 includes a convex roller 31 having a convex portion 310 on the circumferential surface thereof, and the transport rollers 32 and 33 that transport the raw material nonwoven fabric 51M on the upstream side and the downstream side of the convex roller 31. The convex roller 31 is rotated by transmitting a driving force from a drive mechanism (not shown) to its rotating shaft.

The height of each convex portion 310 of the convex roller 31 from the peripheral surface of the convex roller 31 to the apex of the convex portion 310 is preferably 0.001 to 3 mm, and more preferably 0.001 to 0.1 mm. The distance (pitch) between the adjacent convex portions 310 in the direction of the rotation axis is preferably 0.1 to 50 mm, more preferably 0.1 to 3 mm, and the distance (pitch) between the convex portions 310 adjacent in the circumferential direction is preferably 0.1 to 50 mm, and more preferably 0.1 to 3 mm. The shape of the top surface of each convex portion 310 of the convex roller 31 is not particularly limited. For example, a circular shape, a polygonal shape, a circular shape, or the like may be used, and the area of the top surface of each convex portion 310 is preferably 0.001 to 20 mm ² . Good is 0.01~1mm ² .

A method of manufacturing the outer layer sheet 51 after the raising treatment is performed on the processing apparatus 100 using the partial stretching processing unit 200 and the raising processing unit 300 having such a configuration will be described.

First, the raw material non-woven fabric 51M of the spunbonded nonwoven fabric of the outer layer sheet 51 is taken up, and the raw material non-woven fabric 51M is conveyed by the conveyance rollers 24 and 25 to one of the steel matching embossing rollers 23 provided in the partial extension processing unit 200. Between the rollers 21, 22. Then, the raw material non-woven fabric 51M is sandwiched between the pair of uneven rollers 21 and 22 to cause damage to the raw material nonwoven fabric 51M.

Then, the damaged raw material nonwoven fabric 51M' is conveyed to the convex roller 31 provided in the raising processing part 300 by the conveyance rollers 32 and 33. In the raising processing portion 300, the surface of the damaged raw material non-woven fabric 51M' is processed by the convex roller 31, and one of the long fibers constituting the spunbonded nonwoven fabric is partially broken, whereby one end of only the long fiber can be manufactured. An outer layer of raised fibers that is fixed by a heat fusion portion of a spunbonded nonwoven fabric 51 (refer to Figure 3).

The spunbonded nonwoven fabric of the outer layer sheet 51 is preferably formed by blending a fiber-blending softener or a softening agent from the viewpoint of improving the skin feel, reducing the skin friction on the surface, and improving the flexibility. The softening agent preferably contains at least one of a surfactant and a paraffin oil. Further, a known agent may be added as an additional additive (a small amount of a component) to the softener as needed. Further, a lubricant may be added to the softener as needed.

As the surfactant, a carboxylate-based anionic surfactant, a sulfonate-based anionic surfactant, a sulfate-based anionic surfactant, and a phosphate-based anionic surfactant (especially an alkane) can be used. Anionic surfactant such as phosphatidyl ester; sorbitan fatty acid ester, diethylene glycol monostearate, diethylene glycol monooleate, glyceryl monostearate, glycerol monooleate, Polyol fatty acid esters such as propylene glycol monostearate, N-(3-oleooxy-2-hydroxypropyl) diethanolamine, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitol beeswax, polyoxyethylene sorbitol Alcoholic sesquistearate, polyoxyethylene monooleate, polyoxyethylene sorbitan sesquistearate, polyoxyethylene glycerol monooleate, polyoxyethylene monostearate, polyoxyl a nonionic surfactant such as ethylene monolaurate, polyoxyethylene monooleate, polyoxyethylene hexadecyl ether or polyoxyethylene lauryl ether; a cationic surfactant such as a quaternary ammonium salt, an amine salt or an amine; Aliphatic derivatization of a carboxyl group, a sulfonate salt, a sulfated secondary amine or a tertiary amine , Heterocyclic or aliphatic derivatives of secondary amine or tertiary amine, etc. The zwitterionic surfactant or the like.

The oil viscosity at 40 ° C is preferably 20 cst (centimeter tons) or more and 800 cst or less, and more preferably 40 cst or more and 600 cst or less, as various oils such as paraffin oil. Further, the fluidity of the oil is preferably 0 ° C or more and -40 ° C or less, more preferably 0 ° C or more and -30 ° C or less, and the ignition point (COC (Cleveland Open Cup)) The method is preferably 200 ° C or more and 400 ° C or less, and more preferably 250 ° C or more and 350 ° C or less.

As the lubricating material, oleic acid amide, erucic acid decylamine, octadecylamine or the like can be used.

Moreover, the spunbonded nonwoven fabric of the outer layer sheet 51 is not only the shape of the individual body of the spunbonded nonwoven fabric, It can also be formed by overlapping a plurality of sheets of spunbonded non-woven fabric, such as a spunbond-spun-spun-bonded non-woven fabric, a spunbond-meltblown-spunbonded nonwoven fabric, a spunbond-spunbond-meltblown-spunbonded nonwoven fabric, and the like. . In the case of the shape of the laminated nonwoven fabric, it is preferred that the softener be mixed only for one layer of the spunbonded nonwoven fabric, or the softener or the like may be mixed with all of the layers of the spunbonded nonwoven fabric.

As described in more detail, the front outer casing 5A and the back outer casing 5B in the diaper 1 constitute the outer layer sheet 51 and the inner layer sheet 52 in the disposable diaper 1 as shown in Fig. 2 . The fibers of the fibers are oriented in the same direction as the transverse direction (Y direction) of the diaper 1. Further, the front outer casing 5A and the rear outer casing 5B have a partial joint region JT which is partially joined to the outer layer sheet 52 on the outer side of the absorbent body 10, respectively. The partial joint region JT is formed by a plurality of outer body fusion portions 54 which are formed by heat fusion to the outer layer sheet 51 and the inner layer sheet 52 in the lateral direction (Y direction) and the longitudinal direction ( Intermittently joined in the X direction). In the partial joint region JT, the plurality of elastic members 53 are disposed in an extended state in the lateral direction (Y direction) so as not to pass through the plurality of exterior body fusion portions 54, and both ends of the elastic member 53 are disposed in an extended state. The portion is fixed between the outer layer sheet 51 and the inner layer sheet 52, and the outer layer sheet 51 and the inner layer sheet 52 are respectively formed with a plurality of pleats 57 extending continuously over the plurality of elastic members 53. The details will be described below.

The diaper 1 exterior body 5 is provided with the expansion-contraction part of the diaper 1 in the horizontal direction (Y direction). Specifically, the partial joint region JT of the front outer casing 5A and the back outer casing 5B of the diaper 1 is formed on the outer side of the absorbent body 10, and has a waist elasticized portion G1 formed in a relatively absorbent body. Both ends 10a, 10b of the longitudinal direction (X direction) of the body 10 are further outward in the X direction; and the waist expansion and contraction portions G2, G2 are located on both sides of the absorbent body 10 in the longitudinal direction (X direction) The positions of the rims 10s and 10s are further outward in the lateral direction (Y direction), and are formed on the lower portion C side of the waist portion expansion portion G1 and above the lower end portion of the side seal portion S. In other words, in the present embodiment, the partial joint region JT has a stretchable stretch in the lateral direction (Y direction). The expansion and contraction unit has a waist elasticized portion G1 and a waist elasticized portion G2. In the waist stretchable portion G1 and the waist stretchable portion G2, the outer layer sheet 51 and the inner layer sheet 52 are intermittently arranged in a scattered manner in the lateral direction (Y direction) and the longitudinal direction (X direction). The body fusion portion 54 is joined.

As shown in Fig. 2, the waist stretchable portion G1 of each of the front outer casing 5A and the back outer casing 5B of the diaper 1 is intermittently formed with an outer layer sheet 51 and an inner layer so as to be formed in a row in the X direction. The sheet 52 is fused to form the outer body fusion portion 54, and a plurality of rows including the fusion portion row 54S of the plurality of outer body fusion portions 54 are formed at intervals in the Y direction.

Further, the waist elastic-contraction portion G2 of each of the front outer casing 5A and the back outer casing 5B is formed by merging the outer layer sheet 51 and the inner layer sheet 52 intermittently so as to form one row in the X direction. The outer body fusion portion 54 is formed with a plurality of rows of fusion portion rows 54P including a plurality of outer body fusion portions 54 at intervals in the Y direction.

In each of the front outer casing 5A and the back outer casing 5B of the diaper 1, the fused portion row 54S of the waist elasticized portion G1 and the fused portion row 54P of the waist elasticized portion G2 form one row in the X direction.

In the state in which the diaper 1 is unfolded and stretched, the pleats 57 are easily formed in the spunbonded nonwoven fabric having a low rigidity, and the rigidity in the longitudinal direction (X direction) is improved and the operability is improved. The distance between the adjacent fusion portion rows 54S and 54S in the lateral direction (Y direction) (the distance between the fusion portion rows 54P and 54P) is preferably 1 mm or more and 20 mm or less, and more preferably 3 mm or more and 10 mm or less.

In the waist elastic-contraction portion G1 of the diaper 1, the position of each of the plurality of outer-body fusion portions 54 constituting the fusion portion row 54S in the X direction and the other fusion portion row 54S adjacent to the fusion portion row 54S The positions of the plurality of outer casing fusion portions 54 in the X direction are substantially the same. Further, the plurality of elastic members 53 are disposed so as to extend in the Y direction by the gap between the outer casing fusion portions 54, 54 of the plurality of fusion portion rows 54S. The plurality of elastic members 53 are disposed between the outer layer sheet 51 and the inner layer sheet 52.

Similarly, in the waist elasticized portions G2 and G2, the positions of the plurality of outer casing fusion portions 54 constituting one fusion portion row 54P in the X direction and the other fusion portion adjacent to the fusion portion row 54P are formed. The positions of the plurality of outer body fusion portions 54 of the 54P in the X direction are also substantially the same. Further, the plurality of elastic members 53 are disposed so as to extend in the Y direction by the gap between the outer body fusion portions 54, 54 of the plurality of fusion portion rows 54P. The plurality of elastic members 53 are also disposed between the outer layer sheet 51 and the inner layer sheet 52.

In the diaper 1 of the present embodiment, as shown in FIG. 2, the front outer casing 5A and the back outer casing 5B each have an outer layer sheet 51 and an inner layer via adhesives on both outer edges in the X direction. One of the pair of outer fixing regions 55 joined together between the sheets 52 and, in the vicinity of the position of the side edge 10s of the absorbent body 10, has an outer layer sheet 51 and an inner layer sheet 52 joined by an adhesive. The body side fixing area 56 is formed.

In the waist elastic-contraction portion G1, a plurality of elastic members 53 are disposed between the pair of outer fixing regions 55, and the elastic members 53 are fixed to the outer layer sheet 51 and the inner layer sheet 52 in the pair of outer fixing regions 55, respectively. between. On the other hand, between the outer fixing regions 55, the elastic member 53 is not fixed to any of the outer layer sheet 51 and the inner layer sheet 52.

On the other hand, in the waist elastic-contraction portion G2, a plurality of elastic members 53 are disposed between the outer fixing region 55 and the main body-side fixing region 56, and the elastic members 53 are attached to the outer fixing region 55 and the main body-side fixing region 56. Each is fixed between the outer layer sheet 51 and the inner layer sheet 52. On the other hand, between the outer fixing region 55 and the main body side fixing region 56, the elastic member 53 is not fixed to any of the outer layer sheet 51 and the inner layer sheet 52. In addition, the elastic member 53 is not disposed between the pair of main body side fixing regions 56 and 56, and the elastic member 53 is disposed in a state in which the elastic stretchability is not expressed.

As shown in FIG. 2, the main body side fixing region 56 may be formed integrally with the absorbent body 10, but may be formed to extend inside and outside the side edge 10s of the absorbent body 10. Further, the main body side fixing region 56 may be formed on the outer side in the lateral direction (Y direction) of the side edge 10s of the absorbent body 10. Furthermore, the entirety of the body-side fixing region 56 and the absorbent body 10 In the overlapping state, the following two aspects are included: the position of the outer edge of the lateral side (Y direction) of the main body side fixing region 56 is the same as the position of the side edge 10s of the absorbent body 10; and the body side fixing region 56 is It is formed by providing a specific interval between the side edges 10s of the absorbent body 10.

In the diaper 1, the plurality of exterior body fusion portions 54 constituting the fusion portion rows 54S and 54P each include a pair of fusion portions u and d which are arranged in the X direction with a gap m therebetween. In the diaper 1, the outer shape of the outer body fusion portion 54 (including the overall shape of the gap m) is orthogonal to the direction of the fiber alignment (the same direction as the lateral direction (Y direction) in the disposable diaper 1) ( Longer rectangular shape in the X direction). The length L1 of the outer casing fusion portion 54 in the X direction is larger from the viewpoint of the formation of the plurality of pleats 57 extending continuously across the plurality of elastic members 53 or the flexibility of the outer casing 5 in the X direction. Preferably, the length Y2 in the Y direction is 2 times or more, more preferably 7 times or more, and further preferably 10 times or less, more preferably 9 times or less. Specifically, the length L1 of the exterior body fusion portion 54 in the X direction is preferably 1 mm or more and 8 mm or less, and more preferably 1 mm or more and 5 mm or less from the viewpoint of maintaining the properties of the flexible and flexible spunbonded nonwoven fabric. .

Further, each of the fusion portions u and d constituting the exterior body fusion portion 54 preferably has a shape that is long in the X direction. The length L3 of the respective fusion portions u and d in the X direction is preferably the length L4 in the Y direction (the same as the length L2) in terms of the formation of the plurality of pleats 57 extending continuously across the plurality of elastic members 53 and the like. More than 1 time, more preferably 2 times or more, further preferably 4 times or less, more preferably 5 times or less.

Further, the length L5 of the gap m of the outer casing fusion portion 54 (see FIG. 6 , the distance between the fusion portions u and d) is preferably smaller than the adjacent outer casing fusion portions 54 and 54 in the X direction. The distance is L6. By setting the length L5 of the gap m to be smaller than the distance L6, it is easy to achieve both the flexibility of the pleats 57 that are not firmly fixed between the exterior body fusion portions 54 and 54 and the fused portions of the elastic members 53 and between the rows of the fusion portions. The formation of the pleats 57 in which the elastic members 53 continuously extend in the X direction. From the same point of view, the ratio of the length L5 to the above distance L6 is Preferably, it is 40% or less, more preferably 35% or less, further preferably 25% or more, more preferably 30% or more.

Moreover, it is difficult to prevent the elasticity of the elastic member 53 and it is difficult to attach the trace of the elastic member 53 to the skin of the wearer, and the length L1 of the outer body fusion portion 54 in the X direction is adjacent to the X direction. The ratio (L1/L7) of the distance L7 (see FIG. 6) between the elastic members 53 and 53 is preferably 0.1 or more and 0.8 or less, and more preferably 0.2 or more and 0.6 or less. Specifically, the distance L7 between the elastic members 53 and 53 adjacent in the X direction is preferably 4 mm or more and 12 mm or less, and more preferably 5 mm or more and 10 mm or less.

The exterior body fusion portion 54 is formed by superposing the outer layer sheet 51 and the inner layer sheet 52, and subjecting the portion to heat embossing. As the heat embossing device, a convex portion having an embossing roll and an anvil roll and having a shape corresponding to the fused portions u and d of the outer body fusion portion 54 on the outer circumferential surface of the embossing roll can be used. As the processing for forming the exterior body fusion portion 54, ultrasonic sealing, laser, or the like may be employed instead of the heat embossing.

Further, the side seal portion S overlaps the main body side fixing region 56 on the side of the front side portion A and the main body side fixing region 56 on the side of the back side portion B after the outer body fusion portion 54 is formed, and the portion is implemented. It is formed by hot embossing. Further, as the processing for forming the side seal portion S, ultrasonic sealing, laser, adhesive, or the like may be employed instead of the thermal embossing.

In the waist elasticized portion G1 of the diaper 1, as shown in Fig. 7, the elastic member 53 disposed in a state of being stretched in the lateral direction (Y direction) between the outer layer sheet 51 and the inner layer sheet 52 is shrunk so as to be adjacent thereto. The outer layer sheet 51 and the inner layer sheet 52 are deformed so as to expand outward in the thickness direction between the fusion portion rows 54S, and are produced by the outer layer sheet 51 or the inner layer sheets 52, 51R between the adjacent fusion portion rows 54S. The pleats 57 are formed, and between the two sheets 51 and 52, a hollow portion 58 surrounded by the pleats 57 and the pleats 57 is formed.

Further, in the diaper 1, the sheet material of the outer layer sheet 51 in each of the front outer casing 5A and the back outer casing 5B abuts against the skin of the inner layer sheet 52 along the periphery of the waist opening portion WO. The face side is folded back, and the folded portion 51R covers the inner layer sheet 52 in the waist stretch portion G1. Skin contact surface side (see Figure 7). Further, the folded portion 51R is joined to the skin abutting surface of the inner layer sheet 52 and/or the absorbent body 3 by an adhesive applied over the entire surface or partially, and is not fused to the outer body. Fusion portion 54.

In the waist elastic-contracting portion G2, as shown in FIG. 8, the elastic member 53 disposed in a state of being stretched in the lateral direction (Y direction) between the outer layer sheet 51 and the inner layer sheet 52 is contracted, thereby adjoining the fusion portion. The outer layer sheet 51 and the inner layer sheet 52 are deformed so as to expand outward in the thickness direction between the rows 54P, and pleats formed by the outer layer sheets 51 or the inner layer sheets 52, 51R are generated between the adjacent fusion portion rows 54P. 57, and between the two sheets 51, 52, a hollow portion 58 surrounded by the pleats 57 and the pleats 57 is formed.

In each of the front outer casing 5A and the back outer casing 5B of the diaper 1, the pleats 57 of the waist elasticized portion G1 and the pleats 57 of the waist elasticized portion G2 are continuously formed in the X direction. Further, in each of the front outer casing 5A and the back outer casing 5B of the diaper 1, the hollow portion 58 of the waist stretchable portion G1 and the hollow portion 58 of the waist stretchable portion G2 are continuously formed in the X direction. Thus, the plurality of pleats 57 extend continuously across the plurality of elastic members 53 extending in the lateral direction (Y direction).

In the diaper 1 configured as described above, the outer casing 5 includes the outer layer sheet 51 and the inner layer sheet 52, and has a stretchable portion that is stretchable in the lateral direction (Y direction). The elasticized portion has a waist elasticized portion G1 and a waist elasticized portion G2. The above-described elasticized portion in the outer casing 5 of the diaper 1 satisfies all of the following requirements (I) to (III). The details will be described below.

With respect to the above-described stretchable portion in the outer casing 5 of the diaper 1, the average deviation SMD ₂ (necessary condition (I)) of the surface roughness is 6.0 μm or less from the viewpoint of improving the skin feel of the diaper 1 . It is 5.5 μm or less, and more preferably 5.0 μm or less. In addition, the lower limit of the average deviation SMD ₂ of the surface roughness of the stretchable portion is preferably as close as 0. However, if the thickness is 0.5 μm or more, sufficient smoothness can be imparted to the outer casing 5 of the diaper 1 . In the outer casing 5, the average deviation SMD ₂ of the surface roughness of the elasticized portion is the same as the average deviation SMD of the surface roughness of the spunbonded nonwoven fabric of the outer layer sheet 51, and KESFB4- manufactured by Kato Tech Co., Ltd. is used. The measurement was performed by AUTO-A (trade name). Specifically, the measurement was carried out by the following method.

[Method for Measuring Average Deviation SMD ₂ of Surface Roughness of Expansion and Contraction in Exterior Body]

The elasticized portion in the ventral outer casing of the disposable diaper, that is, the waist elasticized portion G1 and the waist elasticized portion G2 in the diaper outer casing 5A in the diaper 1 are formed in the longitudinal direction (X direction). The measurement piece was cut into a rectangular shape having a length of 3.5 cm and a lateral direction (Y direction) as long as possible. The cut measurement piece was set as a measurement sample. The measurement sample was attached to a test stand of a smooth metal plane so that the measurement sample was placed on the side of the outer layer sheet 51 as a measurement surface in a state where the measurement sample was stretched by 100% in the lateral direction (Y direction). The contact was crimped to the measurement sample with a force of 9.8 cN (within an error of ±0.49 cN). The measurement sample was moved 2 cm in the longitudinal direction (X direction) at a fixed speed of 0.1 cm/sec. A uniaxial tension of 19.6 cN/cm was applied to the measurement sample. The contact piece was formed by bending a piano wire having a diameter of 0.5 mm in a U shape with a width of 5 mm, and the measurement sample was pressure-bonded at a force of 9.8 cN. The contacts are crimped by a spring. The spring constant is set to 24.5 cN/mm (within an error of ±0.98 cN/mm or less), and the resonance frequency is set to 30 Hz or more in a state of being in contact with the surface. The measured value of the average deviation of the surface roughness of the elasticized portion in the outer casing is expressed by the SMD ₂ value. The measurement was performed three times in only the longitudinal direction (X direction), and the average value, it is set to the average deviation of the outer surface of the telescopic portion of the body of the roughness SMD _2.

The compression ratio (necessary condition (II)) obtained by the KES compression tester is 70% or more from the viewpoint of improving the skin feel of the diaper 1 with respect to the above-described elastic portion in the outer casing 5 of the diaper 1. Preferably, it is 73% or more, and more preferably 75% or more. In addition, the larger the value of the compression ratio measured by the KES compression tester, the more excellent the cushioning property, but the upper limit of the compression ratio may be 95% or less, and may be outside the diaper 1 The body 5 gives a sufficient cushioning feeling. The compression ratio obtained by the KES compression tester of the above-described expansion and contraction portion in the exterior body 5 is specifically measured by the following method.

[Measurement method of compression ratio by KES compression tester for the expansion and contraction part of the exterior body]

The elasticized portion in the ventral outer casing of the disposable diaper, that is, the waist elasticized portion G1 and the waist elasticized portion G2 in the diaper outer casing 5A in the diaper 1 are formed in the longitudinal direction (X direction). The measurement piece was cut into a rectangular shape having a length of 3.5 cm and a lateral direction (Y direction) as long as possible. The cut measurement piece was set as a measurement sample. The measurement sample was attached to a test stand of a smooth metal plane so that the measurement sample was placed on the side of the outer layer sheet 51 as a measurement surface in a state where the measurement sample was elongated by 70% in the lateral direction (Y direction). As a measuring apparatus, manufactured using the Kato Tech Co., Ltd. KES-FB3 compression tester, measured as compression 2cm ² area was measured, and the thickness T ₀ of the sample under the 0.5gf / cm ² load. Next, the sample was compressed at a pressurization speed of 20 μm/sec. The load increases with compression. The compression was carried out until the load became 50 gf/cm ² . Then, the thickness T _m under a load of 50 gf/cm ² was measured. The value obtained by subtracting the thickness T _m from the thickness T ₀ was divided by the thickness T ₀ and multiplied by 100, thereby calculating the compression ratio (%) obtained by the KES compression tester. That is, the compression ratio (%) is calculated based on ((T _{0 -} T _m ) / T ₀ ) × 100.

The compression-recovery rate (necessary condition (III)) obtained by the KES compression tester is 40% or less from the viewpoint of improving the skin feel of the diaper 1 with respect to the above-described stretchable portion in the outer casing 5 of the diaper 1 . It is preferably 39% or less, and more preferably 38% or less. In addition, as a lower limit of the compression recovery rate by the KES compression tester, if it is 30% or more, the diaper 1 outer casing 5 can be provided with sufficient compression flexibility. The compression recovery ratio obtained by the KES compression tester of the above-described expansion and contraction portion in the exterior body 5 is specifically measured by the following method.

[Measurement of compression recovery rate by KES compression tester for the expansion and contraction part of the exterior body]

The elasticized portion in the ventral outer casing of the disposable diaper, that is, the waist elasticized portion G1 and the waist elasticized portion G2 in the diaper outer casing 5A in the diaper 1 are formed in the longitudinal direction (X direction). The measurement piece was cut into a rectangular shape having a length of 3.5 cm and a lateral direction (Y direction) as long as possible. The cut measurement piece was set as a measurement sample. The measurement sample was attached to a test stand of a smooth metal plane so that the measurement sample was placed on the side of the outer layer sheet 51 as a measurement surface in a state where the measurement sample was elongated by 70% in the lateral direction (Y direction). As a measuring device, a hand-held compression tester (KES-G5) manufactured by Kato Tech Co., Ltd. was used, and the compression load was compressed at a compression speed of 0.02 mm/sec to a maximum load of 50 gf/cm ² (a). Then, the recovery work amount (b) when the pressure is removed at the same speed and the load becomes 0, and the compression recovery rate (%) is calculated by the following formula (3).

Compression recovery rate = (b / a) × 100 (%) ... (3)

The material for forming the respective portions of the disposable diaper 1 will be described.

As the front sheet 2, the back sheet 3, the absorber 4, the side flanges 6, and the like constituting the absorbent body 10, various materials previously used in absorbent articles such as disposable diapers can be used without particular limitation. For example, as the front sheet 2, a nonwoven fabric of a single layer or a multilayer structure, an apertured film, or the like can be used. As the back surface sheet 3, a moisture permeable resin film or the like can be used. As the absorbent body 4, an absorbent core in which particles of an absorbent polymer and a fibrous material are coated with a toilet paper can be used. Further, as the side flange 6, a water-repellent single layer or a non-woven fabric having a multilayer structure or the like can be used.

As the inner layer sheet 52 constituting the front outer casing 5A and the back outer casing 5B of the outer casing 5, the same sheet material (spunbond nonwoven fabric) as the outer layer sheet 51 can be used, but different inner layers can be used. Sheet material. As the inner layer sheet 52 different from the outer layer sheet 51, in particular, a nonwoven fabric comprising two layers such as a hot air non-woven fabric, a hot-rolled nonwoven fabric, a water needle nonwoven fabric, and a melt-blown nonwoven fabric or two or more layers can be used from the viewpoint of flexibility and the like. The laminate is not woven.

Examples of the elastic member (the elastic member 61 for forming the three-dimensional gathers, the elastic member 53, and the like) include synthetic rubber such as styrene-butadiene, butadiene, isoprene, and chloroprene, natural rubber, and EVA (Ethylene). Vinyl acetate, ethylene vinyl acetate, stretchable polyolefin, polyurethane, and the like. As the form of the elastic member, a wire shape (silk tape or the like) or a rope shape (flat rubber or the like) having a rectangular, square, circular, elliptical or polygonal shape, or a multifilament type wire can be preferably used. Characters and so on.

As an adhesive for forming the outer side fixing region 55 and the main body side fixing region 56 and the like for fixing the respective members, it is possible to use an absorbent article such as a disposable diaper without any particular limitation. Various hot melt adhesives and the like are used.

The effect of the above-described pant-type disposable diaper 1 will be described.

In the disposable diaper 1, the outer surface sheet 51 of the outer surface of the diaper 1 shown in Fig. 1 is formed of a spunbonded nonwoven fabric which is a non-woven fabric which satisfies all of the necessary conditions (1) to (4). Specifically, since the necessity (1) of satisfying the basis weight of the spunbonded nonwoven fabric of 19 g/m ² or less is satisfied, the rigidity is low and the cost can be kept low. Moreover, since the average deviation SMD of the surface roughness of the spunbonded nonwoven fabric is 3.20 μm or less and the average deviation MMD of the friction coefficient of the spunbonded nonwoven fabric is not more than 0.0085 (2) and the necessary condition (3), the nonwoven fabric is not woven. The smoothness is improved. Moreover, since the MD fluffiness of the spunbonded nonwoven fabric is required to be 5.0 cN or less (4), the drapability of the nonwoven fabric is improved. Therefore, the spunbonded nonwoven fabric constituting the outer layer sheet 51 is a non-woven fabric which satisfies all of the necessary conditions (1) to (4), and therefore has a low rigidity and an improved cloth similarity. Thus, the disposable diaper 1 in which the spunbonded nonwoven fabric is used for the outer layer sheet 51 has a good touch, and the cost can be kept low. Further, in the diaper 1, the compressive property value at the time of satisfying the minute load of the spunbonded nonwoven fabric is required to be 55.0 (gf/cm ² )/mm or less, so that the bulkiness of the nonwoven fabric is improved. Therefore, the spunbonded nonwoven fabric constituting the outer layer sheet 51 is a non-woven fabric which satisfies all of the necessary conditions (1) to (5), and therefore has a low rigidity and an improved cloth similarity. Thus, the disposable diaper 1 in which the spunbonded nonwoven fabric is used for the outer layer sheet 51 has a good touch, and the cost can be suppressed to be low.

Further, in the disposable diaper 1, as shown in FIG. 2, the front outer casing 5A and the back outer casing 5B have the outer layer sheet 51 and the inner layer sheet 52 partially on the outer side of the absorbent body 10, respectively. The joined partial joint area JT. When the diaper 1 having the partial joint region JT is worn, the front outer casing 5A and the back outer casing 5B are soft and the gas permeability is also improved, so that the quality of the product is further improved.

Further, the disposable diaper 1 is as shown in Figs. 7 and 8 on the abdominal outer casing 5A and the back. Each of the side outer casings 5B has a plurality of pleats 57 extending continuously and a plurality of elastic members 53 extending in a plurality of lateral directions (Y directions). When the diaper 1 is worn, the hollow portion 58 and the waist circumference of the waist elastic portion G1 are formed. The hollow portion 58 of the expansion and contraction portion G2 is continuously formed in the X direction. Therefore, when the diaper 1 is worn, the air permeability is good, and the trace of the elastic member 53 hardly adheres to the skin of the wearer, and the quality of the product is further improved.

Further, as shown in FIGS. 2 and 6, the disposable diaper 1 is disposed outside the front outer casing 5A and the back outer casing 5B, and the body fusion portion 54 is rectangular in the X direction. The fused portion row 54S of the waist elasticized portion G1 extending in the X direction and the fused portion row 54P of the waist elasticized portion G2 are formed at substantially equal intervals in the lateral direction (Y direction). Therefore, it is easy to form a plurality of pleats 57 extending continuously across the plurality of elastic members 53, and the hollow portion 58 of the waist elastic portion G1 and the hollow portion 58 of the waist elastic portion G2 are easily formed continuously in the X direction when the diaper 1 is worn. At the same time, the gas permeability is further improved, and the traces of the elastic member 53 are more difficult to adhere to the wearer's skin. Further, the exterior body fusion portion 54 has a rectangular shape that is long in a direction (X direction) orthogonal to the direction in which the fibers are aligned, and the fibers constitute a layer other than the front outer casing 5A and the rear outer casing 5B. Material 51 and inner layer sheet 52. Therefore, the strength in the direction (X direction) orthogonal to the direction in which the fibers constituting each of the outer layer sheet 51 and the inner layer sheet 52 are aligned is hard to be torn when the diaper 1 is worn, and the quality of the product is further improved.

Further, in the disposable diaper 1, the elasticized portion (the waist elasticized portion G1 and the waist elasticized portion G2) in the outer casing 5 of the diaper 1 shown in Fig. 2 satisfies all of the necessary conditions (I) to (III). Specifically, the stretchable portion in the outer casing 5 satisfies the requirement (I) that the average deviation SMD ₂ of the surface roughness is 6.0 μm or less, and the necessary condition that the compression ratio obtained by the KES compression tester is 70% or more. (II) Since the compression recovery rate obtained by the KES compression tester is 40% or less, all of the necessary conditions (III) are obtained, so that the skin of the outer casing 5 of the diaper 1 is good.

Hereinabove, the present invention has been described based on preferred embodiments thereof, but the present invention is not limited to the above embodiments, and can be appropriately modified.

For example, in the disposable diaper 1, as shown in Fig. 1 and Fig. 2, the outer casing 5 is divided into a belly outer casing 5A, a back outer casing 5B, and a crotch outer casing 5C as separate members. The pant type disposable diaper may be a continuous shape such as an hourglass shape such as an hourglass shape in the abdominal region A, the crotch region C, and the back side region B. Specifically, it may be a pant-type disposable diaper using an outer casing, the outer casing comprising the outer casing sheet 51 and the inner layer sheet 52 respectively including from the ventral region A to the backside region B One of the sheets is continuous, and a plurality of elastic members 53 are fixed between the two sheets 51 and 52 to form an outer casing. In the case of such a pant-type disposable diaper, the outer layer sheet 51 becomes a spunbonded nonwoven fabric. Further, it may be a disposable diaper of the unfolded type which does not have the elastic member 53, and the outer casing 5 includes one sheet material which extends over the ventral region A, the underarm region C, and the back side region B. A continuous shape such as an hourglass shape is formed, and a pair of fastening tapes are provided on the left and right side edges of the back side portion B, and a fixing tape for fixing the fastening tape is provided on the non-skin opposing surface of the abdominal side portion A. In the case of such an unfolded disposable diaper, the above-mentioned one sheet material becomes a spunbonded nonwoven fabric. Further, it may be a disposable diaper of the unfolded type: the outer casing 5 includes one sheet material, and the one sheet material is continuous in a rectangular shape extending over the front side region A, the crotch region C, and the back side region B. The shape is formed, and side plates that are outwardly extended toward the lateral side are attached to the left and right side edges of the back side portion B, and a fastening tape is attached to the laterally outer side of the side plate. In the case of such an unfolded disposable diaper, the above-mentioned one sheet material becomes a spunbonded nonwoven fabric.

Further, as shown in Fig. 2, the partial joint region JT of the front outer casing 5A and the back outer casing 5B constituting the outer casing 5 of the disposable diaper 1 is made by thermally fusing the outer sheet 51 and the inner portion. The layer sheet 52 is joined to form the outer body fusion portion 54. However, the outer layer sheet 51 and the inner layer sheet 52 may be intermittently intermittently in the lateral direction (Y direction) and the longitudinal direction (X direction) by an adhesive. Formed by joining.

Moreover, as shown in FIG. 2, the planar shape (including the overall shape of the gap m) of the exterior body fusion part 54 which comprises the abdominal exterior body 5A and the back exterior exterior body 5B of the exterior body 5 of the disposable diaper 1 is comprised. a rectangular shape that is long in a direction orthogonal to the fiber alignment direction (X direction), but may be His shape. Further, as shown in FIG. 2 and FIG. 6, the exterior body fusion portion 54 is formed by arranging one of the gaps m and arranged in the X direction to form the fusion portions u and d, but may be formed by one continuous fusion portion.

In the above embodiment, the following disposable diaper is further disclosed.

<1>

A disposable diaper comprising: a vertically long absorbent body comprising a front sheet, a back sheet, and an absorbent body disposed between the two sheets; and an exterior body disposed on the absorbent body The non-skin facing surface side; and the outer body has an outer layer sheet forming the outer surface of the disposable diaper, and the outer layer sheet is composed of a spunbonded nonwoven fabric, and the basis weight of the spunbonded nonwoven fabric is 1.9 g/ m ² or less, the average deviation SMD of the surface roughness is 3.20 μm or less, the average deviation MMD of the friction coefficient is 0.0085 or less, and the MD fluffiness softness is 5.0 cN or less.

<2>

The disposable diaper according to the above <1>, wherein the basis weight of the spunbonded nonwoven fabric is preferably 18 g/m ² or less and 10 g/m ² or more.

<3>

The disposable diaper according to the above <1> or <2>, wherein the average deviation SMD of the surface roughness of the spunbonded nonwoven fabric is 3.1 μm or less, preferably 3.0 μm or less, and the lower limit of the average deviation SMD is closer to 0. More preferably, it is preferably 0.5 μm or more.

<4>

The disposable diaper according to any one of the items <1> to <3> wherein the average deviation MMD of the friction coefficient of the spunbonded nonwoven fabric is 0.0075 or less, and the lower limit of the average deviation MMD is closer to 0, and thus Good for 0.003 or more.

<5>

A disposable diaper according to any one of the above items <1> to <4> wherein the above-mentioned spunbond is not woven The MD bulkiness of the cloth is 4.0 cN or less, preferably 3.5 cN or less, and the lower limit of the MD fluffiness softness is preferably closer to 0, more preferably 0.5 cN or more.

<6>

The disposable diaper of any one of the above-mentioned <1> to <5> wherein the compressive characteristic value of the above-mentioned micro load of the spunbonded nonwoven fabric is 14.0 (gf/cm ² )/mm or less, preferably 13.0 (gf). /cm ² )/mm or less, the lower limit of the compression characteristic value at the time of the above-described minute load is preferably closer to 0, and more preferably 1.0 (gf/cm ² )/mm or more.

<7>

The disposable diaper of any one of the above-mentioned <1> to <6>, wherein the ratio of the total area of the plurality of heat-fusible portions of the spunbonded nonwoven fabric constituting the spunbonded nonwoven fabric to the surface area of one side (embossing) Rate) is 15% or less.

<8>

The disposable diaper of any one of the above-mentioned <1> to <7>, wherein the ratio of the total area of the plurality of heat-fusible portions of the spunbonded nonwoven fabric constituting the spunbonded nonwoven fabric to the surface area of one side (embossing) The rate) is 5% or more and 13% or less, preferably 6% or more and 11% or less.

<9>

The disposable diaper of any one of the above-mentioned <1> to <8>, wherein each of the plurality of heat fusion portions constituting the spunbonded nonwoven fabric has an area of 0.3 mm ² or less.

<10>

The disposable diaper according to any one of the above aspects, wherein the plurality of heat fusion portions constituting the spunbonded nonwoven fabric have an area of 0.1 mm ² or more and 0.25 mm ² or less, preferably 0.1 mm ^{2 .} Above and 0.2 mm ² or less.

<11>

The disposable diaper of any one of the above-mentioned <1> to <10> wherein the number of the heat fusion portions of the spunbonded nonwoven fabric is 10 pieces/cm ² or more and 250 pieces/cm ² or less, preferably 35 pieces/ Cm ² or more and 65 pieces/cm ² or less.

<12>

The disposable diaper of any one of the above-mentioned <1> to <11> wherein the spunbonded nonwoven fabric is subjected to a raising treatment.

<13>

The disposable diaper according to any one of the above aspects, wherein the spunbonded nonwoven fabric comprises at least one of a surfactant and a paraffin oil as a softening agent.

<14>

The disposable diaper of any one of the above-mentioned <1> to <13>, wherein the content of the crimped long fibers of the spunbonded nonwoven fabric is 30% by mass or more and 100% by mass or less.

<15>

The disposable diaper of any one of the above-mentioned <1> to <14> wherein the compression characteristic value of the spunbonded nonwoven fabric at a minute load is 15.0 (gf/cm ² )/mm or less.

<16>

The disposable diaper according to any one of the above aspects, wherein the spunbonded nonwoven fabric has a breaking strength in a direction orthogonal to a direction in which the fibers are aligned, and is 7.0 N/50 mm or more.

<17>

The disposable diaper according to any one of the above aspects, wherein the outer casing has a ventral outer casing disposed on a ventral side of the wearer; and a rear outer casing disposed in the diaper The back side outer casing and the back side exterior system each include the outer layer sheet and an inner layer sheet disposed on an inner surface side of the outer layer sheet and forming an inner surface of the disposable diaper. The front outer casing and the back outer casing respectively have a partial joint of the outer layer sheet and the inner layer sheet partially joined to the outer side of the absorbent body region.

<18>

The disposable diaper according to the above <17>, wherein the front outer casing and the back outer casing each comprise the outer layer sheet, the inner layer sheet, and a plurality of linear lines disposed between the sheets The elastic member is formed by the plurality of outer body fusion portions, and the plurality of outer body fusion portions are formed by thermal fusion to form the outer layer sheet and the inner layer sheet in the longitudinal direction and the transverse direction. In the partial joint region, the plurality of elastic members are disposed in a state of being elongated in a lateral direction so as not to pass through the plurality of outer body fusion portions, and are disposed in an extended state. Both end portions are fixed between the outer layer sheet and the inner layer sheet, and the outer layer sheet and the inner layer sheet are respectively formed with a plurality of pleats extending continuously across the plurality of elastic members.

<19>

The disposable diaper according to the above <17> or <18>, wherein the front outer casing and the back outer casing have a waist stretchable portion formed in a longitudinal direction (X direction) of the absorbent body Each of the two end portions is further longitudinally outward, and the outer body fusion portion formed by fusing the outer layer sheet and the inner layer sheet intermittently in a row in the longitudinal direction (X direction) Forming, a plurality of fuse portions including a plurality of the outer body fusion portions are formed in a plurality of rows at intervals in the lateral direction (Y direction).

<20>

The disposable diaper according to any one of the above aspects, wherein the front outer casing and the rear outer casing have a waist elastic portion which is located in a longitudinal direction of the absorbent body 10. The position of the both side edges of the (X direction) is further outward in the lateral direction (Y direction), and the outer casing of the outer layer sheet and the inner layer sheet is fused at the waist expansion-contraction portion The fusion portion is intermittently formed in a line in the longitudinal direction (X direction), and the fusion portion including the plurality of the outer body fusion portions is formed in a plurality of rows at intervals in the lateral direction (Y direction).

<21>

The disposable diaper according to the above <19> or <20>, wherein the distance between the fused portions adjacent to each other in the lateral direction (Y direction) is 1 mm or more and 20 mm or less, preferably 3 mm or more and 10 mm or less.

<22>

The disposable diaper according to the above <19>, wherein the plurality of elastic members are disposed between the pair of outer fixing regions in the waist stretchable portion, and the elastic member is fixed to the outer layer and the outer layer in the pair of outer fixing regions, respectively The inner layer sheets are not fixed to any of the outer layer sheets and the inner layer sheets between the outer fixing regions.

<23>

The disposable diaper according to any one of the above-mentioned <18>, wherein the length L1 of the longitudinal direction (X direction) of the outer body fusion portion is twice or more the length L2 of the lateral direction (Y direction), preferably It is 7 times or more, and is 10 times or less, preferably 9 times or less.

<24>

The disposable diaper according to any one of the above-mentioned <18>, wherein the length L1 of the longitudinal direction (X direction) of the outer body fusion portion is 1 mm or more and 8 mm or less, preferably 1 mm or more and 5 mm or less.

<25>

The disposable diaper according to any one of the above-mentioned <18>, wherein the length L3 of the longitudinal direction (X direction) of each of the fused portions constituting the outer body fusion portion is the length L4 of the lateral direction (Y direction) The ratio is more than 2 times, preferably 2 times or more, and further preferably 4 times or less, preferably 5 times or less.

<26>

The disposable diaper according to any one of the above-mentioned <18> to <25> wherein the length L5 of the gap between the respective fusion portions of the outer body fusion portion is formed (the distance between the fusion portions constituting the outer body fusion portion) It is smaller than the distance L6 between the outer body fusion portions adjacent to each other in the longitudinal direction (X direction).

<27>

The disposable diaper according to any one of the above-mentioned <18>, wherein the length L5 of the gap between the respective fusion portions constituting the outer body fusion portion is adjacent to the longitudinal direction (X direction) The ratio of the distance L6 between the package fusion portions is 40% or less, preferably 35% or less, and further 25% or more, preferably 30% or more.

<28>

The disposable diaper according to any one of the above-mentioned <18>, wherein the length L1 of the longitudinal direction (X direction) of the outer body fusion portion is relative to the elastic member adjacent to each other in the longitudinal direction (X direction) The ratio (L1/L7) of the interval L7 is 0.1 or more and 0.8 or less, preferably 0.2 or more and 0.6 or less.

<29>

The disposable diaper according to any one of the above-mentioned <18>, wherein the distance between the elastic members adjacent to each other in the longitudinal direction (X direction) is 7 mm or more and 12 mm or less, preferably 5 mm or more and 10 mm. the following.

<30>

The disposable diaper according to any one of the above-mentioned <18>, wherein the fiber constituting the outer layer sheet and the inner layer sheet has a fiber alignment direction which is the same direction as the transverse direction of the disposable diaper, The package fusion portion has a rectangular shape that is long in a direction orthogonal to the direction in which the fibers are aligned.

<31>

A disposable diaper according to any one of the above <17> to <30> wherein The package body and the back side exterior body comprise different members.

<32>

The disposable diaper according to any one of the above-mentioned items, wherein the outer layer sheet is formed of the spunbonded nonwoven fabric, and the spunbonded nonwoven fabric of the outer layer sheet is polymerized by a propylene-based polymer as a polyolefin-based polymer. Object formation.

<33>

The disposable diaper according to the above <32>, wherein the propylene-based polymer has a propylene-based polymer having a molecular weight distribution (Mn/Mn) of 1.5 or more and 3.5 or less.

<34>

The disposable diaper according to the above <32> or <33>, wherein the propylene-based polymer comprises a resin comprising 5 to 100% by weight, preferably 25% by weight to 80% by weight, of a random copolymer, Any one or more of a polymer and a block copolymer.

<35>

The disposable diaper according to any one of the above-mentioned <32>, wherein the propylene-based polymer is a polymer containing 5 to 100% by weight of an ethylene propylene random copolymer as a main component, preferably 25 A polymer having a weight percent or more of an ethylene propylene random copolymer as a main component.

<36>

The disposable diaper according to the above <35>, wherein the ethylene propylene random copolymer has an ethylene content of 2.0 mol% or more and 10.0 mol% or less, preferably an ethylene content of 3.0 mol% or more and 8.0 mol% or less.

<37>

The disposable diaper according to any one of the above <1> to <36> wherein the spunbonded nonwoven fabric is a spunbond-spun-spun-bonded non-woven fabric (SSS laminated non-woven fabric).

<38>

A pant type disposable diaper comprising: a vertically long absorbent body comprising a front sheet, a back sheet, and an absorbent body disposed between the two sheets; and an exterior body disposed in the absorbent The non-skin opposite side of the sexual body; the outer body is divided into a ventral side portion disposed on the ventral side of the wearer, a back side portion disposed on the back side, and a lower part of the iliac crest located between the ventral side and the ventral side a pair of side seal portions are formed by joining both side edges of the portion and the side edges of the back side portion, and the outer body includes an outer layer sheet forming the outer surface of the pant type disposable diaper, and is disposed on the outer layer An inner layer sheet on the inner surface side of the sheet, and an elasticized portion having a stretchability in a lateral direction of the pants-type disposable diaper, wherein an average deviation SMD ₂ of surface roughness of the stretchable portion in the outer casing is Below 6.0 μm, the compression ratio obtained by the KES compression tester is 70% or more, and the compression recovery rate by the KES compression tester is 40% or less.

Example

Hereinafter, the present invention will be described in more detail by way of examples. However, the scope of the invention is not limited by the embodiment.

[Example 1]

A resin which is an ethylene-propylene propylene random copolymer containing ethylene and a decanoyl amide as a softening agent are supplied to an extruder, melt-kneaded, and spun from a spinning nozzle hole to form a long fiber which is spun. On the trapping surface, a embossing treatment was performed using a hot embossing roll at an embossing rate of 9% (the area of each heat fusion portion was 0.18 mm ² ) to prepare a spunbonded nonwoven fabric having a basis weight of 17 g/m ² . The spunbonded nonwoven fabric produced was subjected to a raising treatment using the processing apparatus 100 shown in FIG. With respect to the spunbonded nonwoven fabric produced, the average deviation SMD of the surface roughness, the average deviation MMD of the friction coefficient, the bulk softness of the MD, and the compression characteristic value at the time of the minute load were determined by the above-described measurement methods, and are shown in Table 1. Further, the height of each convex portion 210 in the uneven roller 21 of the steel matching embossing roller 23 used is 2.8 mm, and the depth of engagement between each convex portion 210 of the uneven roller 21 and each concave portion 220 of the uneven roller 22 is 2.7. Mm. Further, the distance (pitch) between the convex portions 210 adjacent in the direction of the rotation axis was 7 mm, and the distance (pitch) between the convex portions 210 adjacent in the circumferential direction was 7 mm. Further, the height of each convex portion 310 of the convex roller 31 used is 0.6 mm, and the distance (pitch) between the convex portions 310 adjacent in the direction of the rotation axis is 1.4 mm, and the convex portions 310 adjacent to each other in the circumferential direction are mutually The distance (pitch) is 2.1 mm.

[Embodiment 2]

The polypropylene homopolymer and the ethylene propylene random copolymer are supplied to an extruder and melt-kneaded, and after being spun from the spinning nozzle hole, the cooling air is blown to make the crimp appear and accumulate on the capturing surface, using heat. The embossing roll was embossed at an embossing rate of 8% (the area of each heat-fusible portion was 0.37 mm ² ) to prepare a spunbonded nonwoven fabric having a basis weight of 18 g/m ² . With respect to the spunbonded nonwoven fabric produced, the average deviation SMD of the surface roughness, the average deviation MMD of the friction coefficient, the bulk softness of the MD, and the compression characteristic value at the time of the minute load were determined by the above-described measurement methods, and are shown in Table 1.

[Example 3]

A resin which is an ethylene-propylene propylene random copolymer and a paraffin oil as a softener are supplied to an extruder, melt-kneaded, and spun from a spinning nozzle hole, so that the spun filament is accumulated in the capture. On the surface, an embossing treatment was carried out using a hot embossing roll at an embossing rate of 6.6% (the area of each heat-fusible portion was 0.17 mm ² ), and a spunbonded nonwoven fabric having a basis weight of 17 g/m ² was produced. With respect to the spunbonded nonwoven fabric produced, the average deviation SMD of the surface roughness, the average deviation MMD of the friction coefficient, the bulk softness of the MD, and the compression characteristic value at the time of the minute load were determined by the above-described measurement methods, and are shown in Table 1.

[Example 4]

The spunbonded nonwoven fabric which was produced in the same manner as in Example 1 was subjected to a raising treatment as Example 4. With respect to the spunbonded nonwoven fabric produced, the average deviation SMD of the surface roughness, the average deviation MMD of the friction coefficient, the bulk softness of the MD, and the compression characteristic value at the time of the minute load were determined by the above-described measurement methods, and are shown in Table 1.

[Comparative Example 1]

A spinning machine having a basis weight of 17 g/m ^{2 was} produced in the same manner as in Example 3 except that the embossing treatment was carried out by using a hot embossing roll at an embossing ratio of 16% (the area of each heat fusion portion was 0.31 mm ² ). Sticky and non-woven. With respect to the spunbonded nonwoven fabric produced, the average deviation SMD of the surface roughness, the average deviation MMD of the friction coefficient, the bulk softness of the MD, and the compression characteristic value at the time of the minute load were determined by the above-described measurement methods, and are shown in Table 1.

[Comparative Example 2]

Except using a hot embossing roll emboss rate of 15% (the area of each portion of the heat of fusion 0.72mm ²⁾ embossing process to produce a weight per unit area of the same manner as in Example 3 was 20g / m ² of spun Sticky and non-woven. With respect to the spunbonded nonwoven fabric produced, the average deviation SMD of the surface roughness, the average deviation MMD of the friction coefficient, the bulk softness of the MD, and the compression characteristic value at the time of the minute load were determined by the above-described measurement methods, and are shown in Table 1.

[Comparative Example 3]

The resin which is an ethylene-propylene propylene random copolymer is supplied to an extruder, melt-kneaded, and spun from a spinning nozzle hole, so that the spun filament is deposited on the capturing surface, and the heat embossing is used. The rolls were embossed with an embossing rate of 18% (the area of each heat fusion portion was 0.3 mm ² ) to produce a spunbonded nonwoven fabric having a basis weight of 17 g/m ² . With respect to the spunbonded nonwoven fabric produced, the average deviation SMD of the surface roughness, the average deviation MMD of the friction coefficient, the bulk softness of the MD, and the compression characteristic value at the time of the minute load were determined by the above-described measurement methods, and are shown in Table 1.

[Performance Evaluation]

The non-woven fabrics of Examples 1 to 4 and Comparative Examples 1 to 3 were measured and evaluated for "skin touch" by the following methods, and are shown in Table 1.

<Evaluation of skin touch>

Ten female inspectors evaluated the skin feel of each non-woven fabric in an environment of temperature: 25 ° C and humidity: 40%. According to the assessment of each inspector, the following scores are marked, and the average score of 10 inspectors (rounded off after the decimal point) is used as an assessment of skin feel. Minute.

5 points: The skin feels good.

4 points: The skin feels slightly better.

3 points: Normal.

2 points: The skin feels slightly worse.

1 point: The skin feels poor.

From the results shown in Table 1, it is understood that the spunbonded nonwoven fabrics of Examples 1 to 4 are sheets having a good touch to the skin as compared with the spunbonded nonwoven fabrics of Comparative Examples 1 to 3. Therefore, when the spunbonded nonwoven fabrics of Examples 1 to 4 are used to form the outer layer sheet of the outer surface of the disposable diaper, the skin feel is expected to be good, and the quality of the product is improved, and cost reduction can be expected.

[Example 5]

The spunbonded nonwoven fabric of Example 1 was used for the outer layer sheet, and the "MERRIES diaper (registered trademark) dry breathable L code" manufactured by Kao Co., Ltd., which is a diaper of the form shown in Figs. 1 to 2, was produced.

[Embodiment 6]

A pants-type disposable diaper of Example 6 was produced in the same manner as in Example 1 except that the spunbonded nonwoven fabric of Example 4 was used for the outer layer sheet.

[Comparative Example 4]

A pants-type disposable diaper of Comparative Example 4 was produced in the same manner as in Example 1 except that the spunbonded nonwoven fabric of Comparative Example 3 was used for the outer layer sheet.

[Comparative Example 5]

The GOON (registered trademark) soft-fitting diaper L code of Dawang Paper Co., Ltd. was directly set as the pants-type disposable diaper of Comparative Example 5.

[Comparative Example 6]

The MOONYMAN (registered trademark) AIR-FIT L code of UNICHARM Co., Ltd. was directly set as the pants-type disposable diaper of Comparative Example 6.

[Comparative Example 7]

The PAMPERS (registered trademark) dry type diaper L code manufactured by P&G Co., Ltd. was directly set as the pants type disposable diaper of Comparative Example 7.

[Performance Evaluation]

With respect to the pants-type disposable diapers of Examples 5 to 6 and Comparative Examples 4 to 7, the average deviation SMD ₂ of the surface roughness of the stretchable portion in the exterior body was determined by the above-described measurement method, and the KES compression test of the stretched portion was performed. The compression ratio obtained by the machine and the compression recovery rate obtained by the KES compression tester of the expansion and contraction unit are shown in Table 2.

Further, the pants-type disposable diapers of Examples 5 to 6 and Comparative Examples 4 to 7 were measured and evaluated by the following methods, and are shown in Table 2.

<Evaluation of skin touch>

Ten female inspectors evaluated the skin feel of each pant-type disposable diaper in an environment of temperature: 25 ° C and humidity: 40%. According to the assessment of each inspector, the following scores are marked, and the average score of 10 inspectors (rounded by the decimal point) is set as the skin touch. Evaluation points.

5 points: The skin feels good.

4 points: The skin feels slightly better.

3 points: Normal.

2 points: The skin feels slightly worse.

1 point: The skin feels poor.

According to the results shown in Table 2, the pants-type disposable diapers of Examples 5 to 6 were diapers having a good touch to the skin as compared with the pants-type disposable diapers of Comparative Examples 4 to 7.

[Industrial availability]

According to the present invention, since the spunbonded nonwoven fabric having low rigidity and improved cloth similarity is used for forming the outer surface outer layer sheet, the skin feels good and the cost can be suppressed low.

1‧‧‧Disposable diapers

5‧‧‧Outer body

5a1‧‧‧lateral edge

5A‧‧‧ Ventral external body

5b1‧‧‧lateral edge

5B‧‧‧Back side outer body

5C‧‧‧ Under the outer body

10‧‧‧Absorbable ontology

51‧‧‧ outer sheet

52‧‧‧ Inner sheet

53‧‧‧Flexible components

A‧‧‧ Ventral area

B‧‧‧Back side area

C‧‧‧胯下区域

LO‧‧‧ leg opening

S‧‧‧Side seal

WO‧‧‧Low opening

X‧‧‧ direction

Y‧‧‧ direction

Claims (38)

A disposable diaper comprising: a vertically long absorbent body comprising a front sheet, a back sheet, and an absorbent body disposed between the two sheets; and an exterior body disposed on the absorbent body The non-skin facing surface side; and the outer body has an outer layer sheet forming the outer surface of the disposable diaper, the outer layer sheet being composed of a spunbonded nonwoven fabric having a basis weight of 19 g/m with respect to the spunbonded nonwoven fabric. ² or less, the average deviation SMD of the surface roughness is 3.20 μm or less, the average deviation MMD of the friction coefficient is 0.0085 or less, and the MD bulk softness is 5.0 cN or less. The disposable diaper according to claim 1, wherein the spunbonded nonwoven fabric has a basis weight of 18 g/m ² or less and 10 g/m ² or more. The disposable diaper according to claim 1, wherein the average deviation SMD of the surface roughness of the spunbonded nonwoven fabric is 3.1 μm or less. The disposable diaper according to claim 1, wherein the average deviation MMD of the friction coefficient of the spunbonded nonwoven fabric is 0.0075 or less. The disposable diaper according to claim 1, wherein the MD fluffy softness of the spunbonded nonwoven fabric is 4.0 cN or less. The disposable diaper according to claim 1, wherein the compression characteristic value of the spunbonded nonwoven fabric at a minute load is 14.0 (gf/cm ² )/mm or less. The disposable diaper according to claim 1, wherein a ratio of a total area of the plurality of heat-fusible portions constituting the spunbonded nonwoven fabric to the surface area of the spunbonded nonwoven fabric is 15% or less. The disposable diaper according to claim 1, wherein a ratio of a total area of the plurality of heat-fusible portions constituting the spunbonded nonwoven fabric to the surface area of the spunbonded nonwoven fabric is 5% or more and 13% or less. The disposable diaper according to claim 1, wherein each of the plurality of heat fusion portions constituting the spunbonded nonwoven fabric has an area of 0.3 mm ² or less. The disposable diaper according to claim 1, wherein each of the plurality of heat fusion portions constituting the spunbonded nonwoven fabric has an area of 0.1 mm ² or more and 0.25 mm ² or less. The disposable diaper according to claim 1, wherein the number of the heat fusion portions of the spunbonded nonwoven fabric is 10 pieces/cm ² or more and 250 pieces/cm ² or less. A disposable diaper according to claim 1, wherein the spunbonded nonwoven fabric is subjected to a raising treatment. The disposable diaper according to claim 1, wherein the spunbonded nonwoven fabric comprises at least one of a surfactant and a paraffin oil as a softening agent. The disposable diaper according to claim 1, wherein the content of the staple fibers of the spunbonded nonwoven fabric is 30% by mass or more and 100% by mass or less. The disposable diaper according to claim 1, wherein the compression characteristic value of the spunbonded nonwoven fabric at a minute load is 15.0 (gf/cm ² )/mm or less. The disposable diaper according to claim 1, wherein the breaking strength of the spunbonded nonwoven fabric in a direction orthogonal to the direction in which the fibers are formed is 7.0 N/50 mm or more. The disposable diaper according to claim 1, wherein the outer casing has: a ventral outer casing disposed on a ventral side of the wearer; and a rear outer casing disposed on the back side; the ventral outer casing And the back side exterior system includes the outer layer sheet and an inner layer sheet disposed on an inner surface side of the outer layer sheet and forming an inner surface of the disposable diaper, wherein the front side outer casing and the outer layer Each of the back outer casings has a partial joint region in which the outer layer sheet and the inner layer sheet are partially joined to each other outside the absorbent body. The disposable diaper according to claim 17, wherein the front outer casing and the back outer casing each comprise the outer layer, the inner layer, and the sheet And a plurality of linear elastic members, wherein the partial joint region is formed by a plurality of outer body fusion portions, and the plurality of outer body fusion portions are formed by thermal fusion of the outer layer sheet and the inner layer sheet The material is intermittently joined in the longitudinal direction and the lateral direction. In the partial joint region, the plurality of elastic members are disposed in an extended state in a lateral direction without passing through the plurality of outer body fusion portions, and are elongated. Both end portions of the elastic member disposed are fixed between the outer layer sheet and the inner layer sheet, and the outer layer sheet and the inner layer sheet are respectively formed with a plurality of continuous extensions extending through the plurality of elastic members Pleated. The disposable diaper according to claim 17, wherein the front outer casing and the rear outer casing have a waist stretchable portion formed in a longitudinal direction from each of the longitudinal ends of the absorbent body On the outer side, the outer body fusion portion formed by fusing the outer layer sheet and the inner layer sheet is intermittently formed in a row in the longitudinal direction, and includes a plurality of fusions of the outer body fusion portion. The rows are formed with a plurality of rows spaced apart in the lateral direction. The disposable diaper according to claim 17, wherein the front outer casing and the rear outer casing have a waist elastic portion which is located laterally outward of the longitudinal edges of the absorbent body In the waist expansion-contraction portion, the outer body fusion portion formed by fusing the outer layer sheet and the inner layer sheet is intermittently formed in a row in the longitudinal direction, and includes a plurality of fusion portions of the outer body fusion portion. A plurality of rows are formed by spacing in the lateral direction. The disposable diaper according to claim 19, wherein the fused portions adjacent to each other in the lateral direction are spaced apart from each other by 1 mm or more and 20 mm or less. The disposable diaper according to claim 19, wherein the plurality of elastic members are disposed between the pair of outer fixing regions in the waist stretchable portion, and the elastic members are respectively fixed to the outer layer in a pair of the outer fixing regions The sheet and the inner layer sheet are not fixed to any of the outer layer sheet and the inner layer sheet between the outer fixing regions. The disposable diaper according to claim 18, wherein the longitudinal length L1 of the outer body fusion portion is twice or more the lateral length L2 and is 10 times or less. The disposable diaper according to claim 18, wherein the longitudinal length L1 of the outer body fusion portion is 1 mm or more and 8 mm or less. The disposable diaper according to claim 18, wherein the longitudinal length L3 of each of the fused portions constituting the outer body fusion portion is 1 time or more and 4 times or less the length L4 of the lateral direction. The disposable diaper according to claim 18, wherein a length L5 of a gap between the respective fusion portions constituting the outer body fusion portion is smaller than a distance L6 between the outer body fusion portions adjacent to each other in the longitudinal direction. The disposable diaper according to claim 18, wherein a ratio of a length L5 of a gap between the respective fused portions constituting the outer body fusion portion to a distance L6 between the outer body fusion portions adjacent to each other in the longitudinal direction is 40 % or less and 25% or more. The disposable diaper according to claim 18, wherein a ratio (L1/L7) of a longitudinal length L1 of the outer body fusion portion to a distance L7 between the elastic members adjacent to each other in the longitudinal direction is 0.1 or more and 0.8 or less. The disposable diaper according to claim 18, wherein the elastic members adjacent to each other in the longitudinal direction are spaced apart from each other by L7 by 4 mm or more and 12 mm or less. The disposable diaper according to claim 18, wherein the fibers constituting the outer layer sheet and the inner layer sheet have a fiber alignment direction in the same direction as the transverse direction of the disposable diaper, and the outer body fusion portion is formed with the fiber A rectangular shape having a long alignment direction orthogonal to the direction. The disposable diaper of claim 17, wherein the ventral outer casing and the back outer casing comprise different members. The disposable diaper according to claim 17, wherein the outer layer sheet is formed of the spunbonded nonwoven fabric, and the spunbonded nonwoven fabric of the outer layer sheet is formed of a propylene-based polymer as a polyolefin-based polymer. The disposable diaper according to claim 32, wherein the propylene-based polymer has a propylene-based polymer having a molecular weight distribution (Mn/Mn) of 1.5 or more and 3.5 or less. The disposable diaper according to claim 32, wherein the propylene-based polymer comprises the following resin, and the resin contains at least one of 5 to 100% by weight of a random copolymer, a homopolymer, and a block copolymer. The disposable diaper according to claim 32, wherein the propylene-based polymer is a polymer containing 5 to 100% by weight of an ethylene propylene random copolymer as a main component. The disposable diaper according to claim 35, wherein the ethylene propylene random copolymer has an ethylene content of 2.0 mol% or more and 10.0 mol% or less. The disposable diaper of claim 1, wherein the spunbonded nonwoven fabric is a spunbond-spun adhesive-spun adhesive non-woven fabric. A pant type disposable diaper comprising: a vertically long absorbent body comprising a front sheet, a back sheet, and an absorbent body disposed between the two sheets; and an exterior body disposed in the absorbent The non-skin opposite side of the sexual body; the outer body is divided into a ventral side portion disposed on the ventral side of the wearer, a back side portion disposed on the back side, and a lower part of the iliac crest located between the ventral side and the ventral side a pair of side seal portions are formed by joining both side edges of the portion and the side edges of the back side portion, and the outer body includes an outer layer sheet forming the outer surface of the pant type disposable diaper, and is disposed on the outer layer An inner layer sheet on the inner surface side of the sheet, and an elasticized portion having a stretchability in a lateral direction of the pants-type disposable diaper, and an average deviation SMD of surface roughness of the stretchable portion in the outer casing ₂ is 6.0 μm or less, and the compression ratio obtained by the KES compression tester is 70% or more, and the compression recovery rate by the KES compression tester is 40% or less.