CN219595004U

CN219595004U - Absorbent article and package

Info

Publication number: CN219595004U
Application number: CN202190000664.1U
Authority: CN
Inventors: 白川贵史; 幸田拓也; 富田美奈
Original assignee: Kao Corp
Current assignee: Kao Corp
Priority date: 2020-08-27
Filing date: 2021-08-18
Publication date: 2023-08-29
Anticipated expiration: 2031-08-18
Also published as: JP2022039068A; WO2022044895A1

Abstract

The utility model provides an absorbent article and a package. The absorbent article (1) has a fastening tape (7) and a fastening region (R1) to which the fastening tape (7) can be fastened. The non-skin-facing surface has a fastening region (R1) and a region (R2) other than the fastening region, and at least the region (R2) other than the fastening region is formed by an outer sheet (5). The average friction coefficient of the region (R2) other than the fixed region is 0.2 or less. When the average friction coefficient of the fixed region (R1) is M1 and the average friction coefficient of the region (R2) other than the fixed region is M2, the ratio (M1/M2) of M1 to M2 is 0.75 to 1.25.

Description

Absorbent article and package

Technical Field

The present utility model relates to an absorbent article and a package.

Background

An absorbent article is known which has a fastening tape and a fastening member capable of fastening the fastening tape. The absorbent article is configured such that both ends in the longitudinal direction are disposed around the waist of the wearer, and the fastening tape and the fastening member are fastened to each other, thereby being in a wearing state in which the absorbent article is fastened around the waist of the wearer.

For example, patent document 1 discloses a paper diaper including a hook member attached to one end of the paper diaper and a cover sheet having a bonding property to the hook member, the cover sheet being attached to substantially the entire surface of the sheet of the paper diaper.

Patent document 2 discloses a disposable diaper in which a sheet of tape on which target printing indicating a fastening position of a fastening tape is applied is disposed between a rear sheet covering the back surface side of an absorber and an outer sheet forming the outermost layer of a diaper body.

Further, patent document 3 describes a liquid absorbent article including a fastening tape serving as a hook member of a surface fastener, and an outer sheet which is used as a fastening fleece member of the fastening tape and is positioned on an outer surface of a waist portion.

Prior art literature

Patent literature

Patent document 1: japanese unexamined patent publication No. 01-16885

Patent document 2: japanese patent laid-open No. 2003-153952

Patent document 3: japanese patent laid-open No. 2003-220092

Disclosure of Invention

The present utility model relates to an absorbent article having a longitudinal direction corresponding to the front-rear direction of a wearer and a transverse direction orthogonal to the longitudinal direction, and having a crotch portion arranged in the crotch of the wearer, and a front-rear extending side portion and a back-side portion, and further comprising a fastening tape provided on both side edge portions of the back-side portion along the longitudinal direction, and a fastening region provided on the front-side portion and capable of fastening the fastening tape.

Preferably, the non-skin-facing surface has the fastening region and a region other than the fastening region, and at least the region other than the fastening region is formed of an outer sheet.

Preferably, the average friction coefficient of the region other than the fixed region is 0.20 or less.

Preferably, when the average friction coefficient of the fixed region is M1 and the average friction coefficient of the region other than the fixed region is M2, the ratio of M1 to M2 (M1/M2) is 0.75 to 1.25.

The present utility model also relates to a package for storing the absorbent article.

Preferably, the package is stored in a plurality of packages in a state where the fastening regions are not in contact with each other.

Drawings

Fig. 1 is a perspective view showing an unfolded type disposable diaper as an embodiment of the absorbent article of the present utility model.

Fig. 2 is a developed plan view schematically showing the skin-facing surface side (inner surface side) of the diaper shown in fig. 1 in a developed and extended state.

Fig. 3 is a sectional view of fig. 2 at II-II.

Fig. 4 is a developed plan view schematically showing the non-skin-facing side (outer surface side) of the diaper shown in fig. 1 in a developed and extended state.

Fig. 5 is a partial cut-away view showing a state in which the diaper shown in fig. 1 is contained in a package.

Fig. 6 is an enlarged plan view of the fastening region shown in fig. 1.

Fig. 7 is a conceptual diagram for explaining an evaluation method of the ease of taking out the diaper of the example.

Detailed Description

The absorbent articles described in patent documents 1 to 3 are configured such that a fastening tape is fixedly attached to a sheet itself forming the outer surface of the absorbent article. In such an absorbent article, it is desirable that the fastening tape and the sheet forming the outer surface be reliably engaged from the viewpoint of stably maintaining the wearing state. From this point of view, the sheet forming the outer surface is considered to have a high engaging force as the physical property of the surface, but if the sheet is made to have a high engaging force, there is a concern that the feel of the outer surface of the absorbent article will be damaged, and that hooking will occur when the absorbent article is taken out from the packaging bag, and that the absorbent article will not be easily taken out from the packaging bag.

Accordingly, the present utility model is directed to an absorbent article that can eliminate the drawbacks of the prior art described above.

Hereinafter, the absorbent article of the present utility model will be described based on preferred embodiments thereof. Fig. 1 to 4 show a developed disposable diaper (hereinafter, also simply referred to as "diaper") as an embodiment of the absorbent article of the present utility model.

The diaper 1 shown in fig. 2 has a longitudinal direction X corresponding to the front-rear direction of the wearer and extending from the abdomen side to the back side of the wearer via the crotch portion, and a transverse direction Y orthogonal to the longitudinal direction X in its developed and extended state. The diaper 1 has a side portion a disposed on the side of the abdomen of the wearer when worn, a back portion B disposed on the back side, and a crotch portion C disposed in the crotch. I.e. the abdominal portion a and the back portion B extend in the front-rear direction of the crotch portion C. The abdomen-side portion a, crotch portion C, and back-side portion B are regions that are divided by trisecting the diaper 1 over the entire length in the longitudinal direction X thereof, and extend continuously in the front-back direction of the wearer. The crotch portion C has a excretory part opposing part (not shown) that is disposed to oppose the excretory part of the wearer when the diaper 1 is worn.

In the present specification, the term "developed and extended state" of the diaper 1 means a state in which the diaper 1 is in a developed state and the diaper 1 in the developed state is extended to a state in which the elastic members in each portion are extended to have a designed size (the same size as when the diaper is extended to a planar shape in a state in which the influence of all the elastic members is removed).

The "skin-facing surface" is a surface facing the skin of the wearer when the diaper is worn, and the "non-skin-facing surface" is a surface facing the opposite side of the skin of the wearer when the diaper is worn, when the diaper or a component (e.g., an absorber) thereof is concerned. That is, the skin-facing surface is a surface relatively close to the skin side of the wearer, and the non-skin-facing surface is a surface relatively far from the skin of the wearer. "when worn" and "wearing state" refer to a state in which the diaper is worn while maintaining an appropriate wearing position.

As shown in fig. 3, the diaper 1 includes: a liquid-permeable front sheet 2; a leakage preventing sheet 3 which is hardly permeable to liquid (also includes water repellency); and a liquid-retaining absorbent body 4 disposed between the front sheet 2 and the leakage preventing sheet 3, and these members constitute an absorbent main body 10. In fig. 3, for convenience of explanation, a leak-proof flange 16 to be described later is illustrated in an erected state.

In the absorbent main body 10, the front sheet 2 is disposed on the skin-facing surface side of the absorbent body 4. The front sheet 2 contacts the skin of the wearer in the worn state.

The front sheet 2 and the leakage preventing sheet 3 each have a larger size than the absorber 4, and extend outward from the outer peripheral edge of the absorber 4. The both longitudinal (longitudinal X) edges of the leakage preventing sheet 3 in the present embodiment substantially coincide with the both longitudinal (longitudinal X) edges of the diaper 1.

The diaper 1 has a liquid-retentive absorbent member 4. The absorbent body 4 shown in fig. 2 is disposed so that its longitudinal direction matches the longitudinal direction X of the diaper, and extends from the abdomen-side portion a to the back-side portion B through the crotch portion C. Both longitudinal side edges of the absorber 4 are located inward of both longitudinal side edges of the diaper 1.

As shown in fig. 3, the absorbent body 4 is formed by covering an absorbent core 4a having an absorbent property with a liquid-permeable core-wrap 4 b.

The diaper 1 has a pair of leakage preventing cuffs 16, 16 disposed along both side portions of the absorbent main body 10 in the longitudinal direction X.

The leakage preventing cuff 16 includes a linear cuff forming elastic member 16a and a water-repellent and breathable cuff forming sheet 16b. The cuff forming elastic member 16a extends in the longitudinal direction X at the free end portion of the leakage preventing cuff 16. The leakage preventing cuffs 16 are raised toward the skin of the wearer at least in the crotch portion C by contraction of the cuff-forming elastic members 16a, thereby suppressing the outflow of excretions such as urine to the outside in the lateral direction Y.

As shown in fig. 3, the diaper 1 of the present embodiment includes an outer sheet 5 disposed on the non-skin-facing surface side of the absorbent main body 10, that is, on the non-skin-facing surface side of the leakage preventing sheet 3. As shown in fig. 4, the outer sheet 5 mainly forms the outer surface (non-skin-facing surface) of the diaper 1, and extends in the longitudinal direction X from the abdomen-side portion a to the back-side portion B via the crotch portion C. The outer sheet 5 forms the outer shape of the diaper 1 in an unfolded and elongated state, and the peripheral edge of the outer sheet 5 forms the contour lines of the abdomen-side portion a, crotch-side portion C, and back-side portion B, respectively. In fig. 4, for convenience of explanation, the burring elastic member 16a and the leg puckering elastic member 15 described later are omitted from illustration.

As shown in fig. 2 and 4, the diaper 1 of the present embodiment has a contour that is narrowed at the center side in the longitudinal direction X, that is, at the crotch C side of the crotch portion a and the back side portion B, and has end portions of the crotch portion a and the back side portion B in the longitudinal direction X protruding outward in the lateral direction Y than the crotch C side. In other words, the diaper 1 of the present embodiment has wide portions on the side portions a and the back portion B, respectively, and has a narrowed portion between the wide portions in the longitudinal direction X, which is narrower than the width of the wide portions.

The outer layer sheets 5 extend outward in the lateral direction Y from both side edges of the absorbent body 4 in the longitudinal direction X, and form side flap portions SF together with the leakage preventing sheet 3 and the cuff forming sheet 16b constituting the leakage preventing cuff 16. The side flap portions SF are portions formed of sheet members extending outward in the lateral direction Y from both side edges of the absorbent body 4 in the longitudinal direction X, respectively. The sheet members constituting the side flap portions SF extend from the abdomen portion a to the back portion B through the crotch portion C, and are joined to each other at the extension portions extending outward in the lateral direction Y from the both side edges of the absorbent body 4, respectively, by a known joining method such as adhesive, heat sealing, ultrasonic sealing, or the like.

The diaper 1 of the present embodiment has a waist wing WF (see fig. 2) extending from the peripheral edge of the absorber 4 to the outside in the longitudinal direction X or the outside in the lateral direction Y on the end side in the longitudinal direction X of each of the side portions a and the back portion B, specifically, in the region between the front and rear ends in the longitudinal direction X of the wide portion of each of the side portions a and the back portion B. The waist wing WF is a portion formed of a member extending outward in the longitudinal direction X or outward in the lateral direction Y than the peripheral edge of the absorber 4 on the end side in the longitudinal direction X of the back side portion B. In the present embodiment, the waist wing WF is constituted by a cuff forming sheet 16b extending outward from the peripheral edge of the absorber 4, the leakage preventing sheet 3, and the outer sheet 5. The sheets are joined to each other at the extending portions from the peripheral edge of the absorber 4 by a known joining method such as an adhesive, heat sealing, or ultrasonic sealing. The waist wing WF corresponds to the waist circumference of the wearer when the diaper 1 is worn. The both side portions of the waist wing WF in the lateral direction Y are also front and rear end portions of the side flap SF in the longitudinal direction X.

As shown in fig. 2, the diaper 1 of the present embodiment is configured such that the leg gather forming elastic members 15 are disposed in an elongated state so as to extend in the longitudinal direction X through the crotch portion C at both side portions of the diaper 1 in the longitudinal direction X, specifically, at the pair of side flap portions SF, respectively. By contraction of the elastic members 15, leg gathers are formed in the left and right portions disposed around the leg circumference of the wearer, that is, in both side portions in the longitudinal direction X of the diaper 1. In the present embodiment, the leg gather forming elastic member 15 is fixed in an elongated state along the longitudinal direction X between the cuff forming sheet 16b and the leakage preventing sheet 3 in the side flap portion SF.

As shown in fig. 1 and 2, the diaper 1 is provided with a pair of fastening tapes 7, 7 at both side edges of the back side portion B along the longitudinal direction X. The fastening tapes 7 are provided so as to extend outward in the lateral direction Y from both side edges of the back side portion B along the longitudinal direction X. One end of each fastening tape 7 on the inner side in the lateral direction Y is fixed to the sheet member constituting the diaper 1, preferably to each other, for example, between the leakage preventing sheet 3 and the outer layer sheet 5 (not shown).

The fastening tape 7 of the present embodiment includes a tape base 70 and an engaging portion 71 fixed to a skin-facing surface of the tape base 70. The engaging portion 71 has engaging protrusions on the skin-facing surface thereof. As the engaging portion 71, a male surface member of a mechanical fastener can be used. The mechanical fastener includes a male member having a plurality of engaging protrusions arranged on a surface thereof, and a female member having a material capable of being directly engaged with the engaging protrusions arranged on a surface thereof, and is a fastening member formed by bringing the male member and the female member into surface contact and engaging the both. As the mechanical fastener, various known mechanical fasteners can be used without particular limitation.

The diaper 1 has a fastening region R1 on the non-skin-facing surface of the side portion a in which the engaging portion 71 of the fastening tape 7 can be detachably fastened. The fastening region R1 of the present embodiment is formed by joining the fastening member 6 including the female member of the mechanical fastener described above to the non-skin-facing surface of the outer sheet 5. That is, the fastening region R1 of the present embodiment is formed by the fastening member 6 on the outer sheet 5 in the ventral portion a. The material of the portion of the fixing member 6 where the fixing engagement portion 71 is formed, that is, the material of the female member, can be selected according to the shape of the engagement protrusion of the engagement portion 71. As a material of the female member, for example, a nonwoven fabric having a loop portion, a mesh portion, or the like, or having high engagement properties can be used.

The fastening region R1 may be a region including a part of the outer sheet 5 including a non-woven fabric having high fastening properties, or may be a fastening member 6 provided on the non-skin-facing surface of the outer sheet 5 as a member separate from the outer sheet 5.

As shown in fig. 4, the non-skin-facing surface of the diaper 1 has a fastening region R1 and a region R2 other than the fastening region in the planar direction. Hereinafter, the region R2 other than the "fastening region" is also referred to as "fastening outer region" R2. The fastening outer region R2 is a region in which the engaging portion 71 of the fastening tape 7 is not disposed in the worn state. The fastening outer region R2 may or may not have the fastening ability with the engaging portion 71.

In the present embodiment, the fixing outer region R2 is a region outside the peripheral edge of the fixing region R1.

At least the outer region R2 fixed to the non-skin-facing surface of the diaper 1 is formed of an outer sheet 5. The outer layer sheet 5 may be formed with both the fastening region R1 and the fastening outer region R2. In this case, from the viewpoint of facilitating the operation of fastening the fastening tape 7, it is preferable that the fastening region R1 and the fastening outer region R2 are formed so as to be visually distinguishable. As a method for distinguishing the fixed region R1 from the fixed region R2, for example, a method of performing printing or the like on the entire fixed region R1 along a line of the outline of the fixed region R1 can be exemplified.

In the diaper 1 of the present embodiment, the average friction coefficient of each of the fastening region R1 and the fastening outer region R2 is within the following range. The average friction coefficient of the outer sheet 5 shown below is the physical properties of the non-skin-facing surface of the outer sheet 5. The measurement method of the average friction coefficient is described later.

The average friction coefficient M2 of the outer region R2 is 0.20 or less. The average friction coefficient can be used as an index of the feel of the object surface, in particular, an index indicating the degree of hooking when touching the object surface.

When the average friction coefficient in the fixed region R1 is M1 and the average friction coefficient in the fixed outer region R2 is M2, the ratio of M1 to M2 (M1/M2) is 0.75 to 1.25. The closer the ratio M1/M2 is to 1.00, the more similar the degree of hooking of the fastening region R1 and the fastening outer region R2 is.

As shown in fig. 1, the diaper 1 of the present embodiment is fastened to the fastening region R1 by the fastening tape 7, and is worn by a wearer by forming a waist opening WH through which the waist of the wearer passes and a pair of leg openings LH through which the lower limbs of the wearer pass. The inventors of the present utility model found that by setting the average friction coefficient of the fastening region R1 and the fastening outer region R2 to be within the above range, the fastening force with respect to the fastening portion 71 of the fastening tape 7 in the fastening region R1 can be ensured, and the feel of the non-skin-facing surface of the outer sheet 5 can be improved. The reason for this effect is that by setting the fastening outer region R2 to 0.2 or less and the ratio M1/M2 to 0.75 or more and 1.25 or less, the reduction in the engagement force between the fastening region R1 and the engagement portion 71 can be suppressed, and the feel of the entire outer surface of the diaper 1 can be made smooth and uniform. In such a diaper 1, the wearing state shown in fig. 1 can be stably maintained.

In addition, diapers are typically circulated in a compressed state within a package. When the diaper is taken out from the package, the diaper is pulled out of the package while adjacent diapers rub against each other. The diaper 1 of the present embodiment has a smooth outer surface, and therefore can be easily taken out of the package.

Fig. 5 shows an embodiment in which a plurality of packages P are accommodated in a package bag 30 in the diaper 1 of the present embodiment. In this package P, the diapers 1 are folded in half at the approximate center of the crotch portion C so as to divide the entire length 2 of the longitudinal direction X equally, and a plurality of the folded diapers 1 are arranged and stored in the package bag 30 in a state of being compressed in the thickness direction. In this state, the non-skin-facing surface of the abdomen portion a and the non-skin-facing surface of the back portion B of the adjacent diapers 1 are in contact with each other. That is, the diapers 1 are stored in a plurality of packages in a state where the fastening regions R1 are not in contact with each other. With such a configuration, the fastening regions R1 can be prevented from being caught by each other, and therefore, the diaper 1 can be more easily taken out of the package bag 30.

In the package P shown in fig. 5, the direction X1 of the taking-out of the diaper 1 from the package bag 30 is substantially the same as the longitudinal direction X of the diaper 1. I.e. the diaper 1 is taken out of the packaging bag 30 substantially in the longitudinal direction X.

[ method for measuring average Friction coefficient ]

First, the measurement object such as the outer sheet 5 is taken out from the diaper. Next, 5kPa (50 gf/cm) was applied to the object to be measured such as the outer sheet 5 by a contact using a KES-FB4 surface tester (manufactured by KATO TECH Co., ltd.) ² ) The contact is moved in the horizontal direction by 3cm at a constant speed of 0.1cm/sec under the loaded state. The contact element is moved in the longitudinal direction X of the diaper. The coefficient of friction (MIU) of the area in which the contact is moved is measured. Such measurements were performed at arbitrary 3 locations, and the average value thereof was taken as the average friction coefficient of the sheet.

When the physical properties of the component such as the outer sheet 5 are measured by taking out the component from the diaper 1, if the component is fixed to another component by an adhesive, welding, or the like, the other component is peeled off by blowing cold air to the fixing portion, and then the adhesive attached to the component to be measured is dissolved and removed by an organic solvent. This operation is common to all measurements in this specification.

In the fixed region R1, at least a region in which the engaging portion 71 is disposed is set as a region to be measured when measuring physical properties such as an average friction coefficient. That is, the fastening tape 7 is disposed in the region where the engaging portion 71 is disposed when the fastening region R1 is disposed so as to form the waist opening WH and the leg opening LH.

In addition, regarding the fixed outer region R2 of the outer layer sheet 5, at least the region in the center in the longitudinal direction X of the abdomen-side portion a or the back-side portion B is set as the region to be measured when measuring physical properties such as the average friction coefficient.

The ratio M1/M2 is preferably 0.75 or more, more preferably 0.80 or more, still more preferably 1.25 or less, still more preferably 1.20 or less, still more preferably 0.75 or more and 1.25 or less, still more preferably 0.80 or more and 1.20 or less, from the viewpoint of further improving the feel of the outer surface of the diaper 1.

The average friction coefficient M2 of the fastening outer region R2 is preferably 0.10 or more, more preferably 0.11 or more, still more preferably 0.20 or less, still more preferably 0.19 or less, still more preferably 0.10 or more and 0.20 or less, still more preferably 0.11 or more and 0.19 or less, from the viewpoint of both the feel of the outer surface of the diaper 1 and the ease of taking out the diaper 1 from the package bag.

The distance between fibers in the fastening region R1 is preferably 50 μm or more, more preferably 70 μm or more, still more preferably 250 μm or less, still more preferably 200 μm or less, still more preferably 50 μm or more and 250 μm or less, still more preferably 70 μm or more and 200 μm or less, from the viewpoint of ensuring the engagement force between the fastening tape 7 and the fastening region R1 more reliably. With this configuration, a sufficient space for engaging the hook and loop fastener 7 can be ensured, and the engaging force can be ensured more reliably. The inter-fiber distance is measured by a method described later.

In order to more reliably achieve the above-described effects, the engaging portion 71 of the hook and loop fastener 7 preferably has a large number of engaging protrusions on the surface.

< method for measuring distance between fibers >

The inter-fiber distance (average inter-fiber distance) of the fiber aggregate such as nonwoven fabric and paper is obtained by the following formula (1) based on the assumption of Wrotnowski. The following formula (1) is generally used for obtaining the inter-fiber distance of the fiber aggregate. Based on the assumption of Wrotnonowski, the fibers are cylindrical and the individual fibers are not regularly arranged in a staggered fashion.

The inter-fiber distance in the fixed region R1 of the measurement object is calculated according to the following formula (1). The thickness t, the grammage W, the resin density ρ of the fiber, and the fiber diameter D used in the following formula (1) are average values of measured values at any of a plurality of measurement points in the soft feces holding portion.

The thickness t (mm) is measured by the following method. First, a cut piece having a length of 100mm×a width (a direction perpendicular to the length) of 100mm was cut from the fastening region R1 of the outer sheet. When the cut pieces of this size cannot be produced, the cut pieces as large as possible are produced. Next, the cut pieces were placed on a flat plate, a glass plate on the flat plate was placed thereon, a weight was uniformly placed on the glass plate so that the load including the glass plate became 0.05kPa, and the thickness of the cut pieces was measured. The measured environment was 20.+ -. 2 ℃ and the relative humidity 65.+ -. 5%. The measuring instrument used was a microscope (manufactured by KEYENCE CORPORATION, VHX-1000). An enlarged photograph of the cut surface of the above-mentioned cut piece was obtained by using the measuring instrument. When taking the magnified photograph, objects of known size are taken simultaneously. Then, a scale is fitted to an enlarged photograph of the cut surface of the cut piece, and the thickness of the cut piece is measured. The above operation was performed 3 times, and the average value of 3 times was used as the thickness t of the fixed region R1.

Gram weight W (g/m) ² ) The fastening region R1 is cut into a predetermined size (for example, 100mm×100 mm), and after measuring the mass, the mass measurement is divided by an area obtained from the predetermined size to obtain a "gram weight W (g/m) ² ) =mass/area determined from a predetermined size "). This measurement was repeated 4 times, and the average value thereof was taken as the grammage.

Resin Density ρ (g/cm) of fiber ³ ) Chemical short according to JIS L1015 using a Density gradient tubeThe measurement method of the density gradient tube method described in the fiber test method was carried out (URL is http:// kikakurui. Com/L/L1015-2010-01.Html, book is JIS fiber handbook-2000, (Japanese standards Association) P.764-765).

The method of measuring the fiber diameter D is according to < method of measuring fiber diameter > described below.

[ 1]

< method for measuring fiber diameter >

The fixed region R1 was cut with a razor (for example, a single-edge blade manufactured by FEATHER Safety Razor corporation) to obtain a measuring sheet having a quadrangular shape (8 mm×4 mm) in plan view. In cutting the measuring object, it is noted that the structure of the cut surface of the measuring piece formed by the cutting is not broken by the pressure or the like at the time of cutting. As a preferable method of cutting the measuring object, a method of cutting the measuring object after sufficiently freezing the measuring object in liquid nitrogen before cutting the measuring object can be exemplified. The measuring sheet was attached to a sample stand by means of a paper double-sided tape (NICETACKNW-15 manufactured by NICHIBAN Co., ltd.). The measurement piece was then platinum coated. The coating was applied using an ion sputtering apparatus E-1030 (trade name) manufactured by Hitachi Keke Co., ltd.) for 30 seconds. The cut surface of the measuring sheet was observed with a field emission scanning electron microscope S-4000 manufactured by Hitachi, inc. at a magnification of 1000 times. Next, the length of 10 fibers in the width direction relative to the longitudinal direction was measured for the constituent fibers on the non-skin-facing surface of the measuring sheet, and the average value was taken as the fiber diameter.

The engagement strength between the fastening tape 7 and the fastening region R1 is preferably 2.0N or more, more preferably 2.5N or more, still more preferably 6.0N or less, still more preferably 5.5N or less, still more preferably 2.0N or more and 6.0N or less, still more preferably 2.5N or more and 5.5N or less, from the viewpoint of maintaining the wearing state of the diaper 1 more stably. The engagement strength can be measured by the method for measuring the engagement strength in the fastening tape and the fastening region of the embodiment described later.

The area of the fastening region R1 is preferably 3% or more, more preferably 5% or more, still more preferably 30% or less, still more preferably 25% or less, still more preferably 3% or more and 30% or less, still more preferably 5% or more and 25% or less, from the viewpoint of further suppressing hooking of the outer surface (non-skin-facing surface) of the diaper 1 and facilitating removal of the diaper 1 from the package bag.

From the viewpoint of bringing the average friction coefficients of the fixed region R1 and the fixed outer region R2 in the outer layer sheet 5 into the above-described range, the outer layer sheet 5 preferably has any one of the following structures (1) to (10), and more preferably has 2 or more of these structures (1) to (10).

Structure (1): the fineness of the constituent fibers is 0.05dtex or more and 2.0dtex or less.

Structure (2): the non-skin-facing surface is formed with irregularities.

Structure (3): a plurality of openings are formed.

Structure (4): the constituent fibers are oriented in the machine direction X in the non-skin-facing surface.

Structure (5): the non-skin-facing surface was embossed.

Structure (6): the non-skin-facing surface was subjected to a void blocking treatment.

Structure (7): the outer layer sheet 5 contains a softening agent.

Structure (8): hollow fibers are contained as constituent fibers.

Structure (9): flat fibers are present on the non-skin opposite side.

Structure (10): the non-skin-facing surface contains non-melt-bonding fibers.

In the above-described structure (1), when the constituent fibers having a small fineness are used, the surface of the outer layer sheet 5 becomes smooth and fine, and the surface can be made smoother. From such a viewpoint, the fineness of the constituent fibers of the outer layer sheet 5 is preferably 0.05dtex or more, more preferably 2.0dtex or less, still more preferably 1.5dtex or less, still more preferably 0.05dtex or more and 2.0dtex or less, still more preferably 0.05dtex or more and 1.5dtex or less.

[ method for measuring fineness of fiber ]

The sheet of the measurement object was cut into pieces of 50mm X100 mm (area 5000 mm) ² ) Is a rectangle of the above, to prepare a measurement sample. Next, the measurement sample was subjected to cross-sectional observation, and the fiber thickness was measured by an electron microscope using 10 standard fibers at positions spaced apart by 0.05mm in the thickness direction from the non-skin-facing surface of the measurement sample, to calculate a fiber thickness average Dn (μm). Next, a resin composition of standard fibers at positions spaced apart by 0.2mm in the thickness direction from the skin-facing surface was determined, and the theoretical fiber presence density Pn (g/cm) was obtained by means of a Differential Scanning Calorimeter (DSC) ³ ). Based on the obtained fiber thickness average Dn (μm) and the theoretical fiber present density Pn (g/cm) ³ ) The weight (g) of each 10,000m of the fiber length was calculated, and the calculated value was used as the fineness (dtex) of the constituent fibers of the skin-side fiber layer.

With the above-described structure (2), the irregularities formed on the non-skin-facing surface of the outer sheet 5 are formed in a predetermined pattern in a plan view. The predetermined pattern can be a known pattern used for a front sheet of an absorbent article or the like. The surface roughness is preferably formed in a direction having an angle with respect to the lateral direction Y, more preferably in a direction along the longitudinal direction X, from the viewpoint of reducing the contact area of the outer layer sheet 5 by forming the surface roughness and facilitating control of the average friction coefficient. The irregularities on the sheet surface can be formed by a known method.

With the above structure (3), when a plurality of openings are formed in the outer layer sheet 5, it is easy to control the average friction coefficient. From such a viewpoint, the plurality of openings are preferably formed in a scattered shape in the outer layer sheet 5 in a plan view.

From the same viewpoints as described above, the area ratio of the openings per unit area in the outer layer sheet 5 is preferably 5% or more, more preferably 10% or more, still more preferably 25% or less, still more preferably 20% or less, still more preferably 5% or more and 25% or less, still more preferably 10% or more and 20% or less.

From the same point of view as described above, it is openedThe size of the holes, i.e. the area of the openings, is preferably 0.3mm ² The above is more preferably 0.5mm ² The above is preferably 10mm ² Hereinafter, it is more preferably 7mm ² Hereinafter, it is preferably 0.3mm ² Above and 10mm ² Hereinafter, more preferably 0.5mm ² Above and 7mm ² The following is given.

The area ratio of the openings per unit area and the area of the openings were obtained by the method described below.

In the hole forming process, for example, a cutting device having a cutter roll and an anvil roll, which has a cutter blade having a shape corresponding to the outline of the hole on the outer peripheral surface of the cutter roll, is used.

[ method for measuring area Rate of openings and area of openings per unit area ]

At any 3 positions of the outer sheet 5, measurement sheets of X30mm in the longitudinal direction and Y30mm in the transverse direction were cut. Then, the total area of the openings in the measuring sheet was measured, and based on the total area and the area of the measuring sheet, the total area of the openings was calculated relative to the unit area (100 mm in 10mm square ² ) Is a ratio of (2). The measurement was performed at any 3 sites of the outer sheet 5, and the average value of these was used as the area ratio of the openings per unit area.

For the area of the openings, 10 arbitrary openings were selected for the measuring sheet cut out by the same measuring method as the area ratio of the openings per unit area, and the areas thereof were measured. Such measurements were performed at any 3 positions of the outer layer sheet 5, and the average value of these was used as the open area.

With the above-described structure (4), when the fibers are oriented in the longitudinal direction X, the touch feeling when the sheet is touched along the longitudinal direction X can be made smooth. Whether or not the constituent fibers are oriented in the longitudinal direction X can be determined based on whether or not the constituent fibers form an angle of ±30 degrees or less with the longitudinal direction X. Specifically, the non-skin-facing surface of the outer sheet 5 is observed in an enlarged manner by an electron microscope, and if 70% or more of all the constituent fibers in the observation field form an angle of ±30 degrees or less with the longitudinal direction X, it can be determined that the constituent fibers of the outer sheet 5 are oriented in the longitudinal direction X.

With the above-described structure (5), when the embossing process is performed on the sheet, the contact area of the sheet can be reduced, and the average friction coefficient can be controlled more easily. Examples of the embossing include compression-only embossing without heating, hot embossing, ultrasonic embossing, and high-frequency embossing.

The embossed portions formed by the embossing process are preferably formed in the outer layer sheet 5 in a scattered manner from the viewpoint of making the feel of the sheet smoother.

From the same viewpoint as described above, the area ratio of the embossed portion per unit area on the non-skin-facing surface of the outer sheet 5 is preferably 5% or more, more preferably 10% or more, still more preferably 25% or less, still more preferably 20% or less, preferably 5% or more and 25% or less, still more preferably 10% or more and 20% or less.

From the same viewpoint as described above, the area of the embossed portion in the non-skin-facing surface of the outer sheet 5 is preferably 0.3mm ² Hereinafter, more preferably 0.5mm ² Hereinafter, it is more preferable to use 10mm ² The above is more preferably 7mm ² The above is preferably 0.3mm ² Above and 10mm ² Hereinafter, more preferably 0.5mm ² Above and 7mm ² The following is given. The area of the embossed portion is the area of each embossed portion.

The area ratio of the embossed portion per unit area and the area of the embossed portion are measured by replacing "open hole" in the above-described [ measuring method of open hole area ratio and open hole area per unit area ] with "embossed portion".

With the above-described structure (6), the void-clogging treatment is a treatment of clogging the voids between the constituent fibers of the sheet, whereby the sheet surface can be made smoother. Examples of the void clogging treatment include a heat treatment, an ultrasonic treatment, and a coating treatment. As the liquid used in the coating treatment, a liquid in which volatile components in the liquid volatilize after coating and only solid components remain in the sheet can be used. Examples of the liquid include natural extracts contained in skin care agents and the like, oils, and inks used for printing. The oil agent is preferably an oil having high viscosity.

With the above-described structure (7), the soft agent can further improve the touch of the sheet. The content of the softening agent in the outer layer sheet 5 is preferably 0.03 mass% or more, more preferably 0.1 mass% or more, still more preferably 10 mass% or less, still more preferably 6 mass% or less, still more preferably 0.03 mass% or more and 10 mass% or less, still more preferably 0.1 mass% or more and 6 mass% or less. The softener content in the sheet was measured by the following method. First, a portion where bonding between sheets is not performed by a hot melt adhesive, a hot melt bonding, or the like is cut from a sheet to be measured, and this is used as a test piece. The mass of the test piece after being dried for 1 hour in the electric drying at 60℃was measured and used as an initial mass. After that, the test piece was immersed in acetone for 2 hours, and then naturally dried for 1 week, and the mass after drying in electric drying at 60 ℃ for 1 hour was regarded as a mass without softener. The value obtained by subtracting the mass without the softener from the initial mass was divided by the mass without the softener to obtain a value expressed as a percentage (%) as the softener content.

With the above-described structure (8), the sheet is soft by containing the hollow fiber, and the touch feeling of the skin can be improved. From such a viewpoint, the grammage of the hollow fibers in the outer sheet 5 is preferably 5g/m ² The above is more preferably 8g/m ² The above is preferably 15g/m ² Hereinafter, it is more preferably 20g/m ² Hereinafter, it is more preferably 5g/m ² Above and 20g/m ² Hereinafter, more preferably 8g/m ² Above and 15g/m ² The following is given.

With the above structure (9), when flat fibers are contained, the surface of the sheet can be made smoother. The flat fiber is a fiber having a fiber cross-section with a flattening ratio (major axis length/minor axis length) of 1.2 or more. For example, when the fiber has a right circular cross section, the flattening ratio is 1, and as the degree of flattening of the cross section increases (the cross section becomes nearly elliptical), the flattening ratio becomes greater than 1.

The presence rate of the flat fibers in the non-skin-facing surface of the outer layer sheet 5 is preferably 60% or more, more preferably 70% or more, from the viewpoint of making the skin feel of the outer layer sheet 5 smoother. The upper limit of the presence rate of the flat fiber is not particularly limited, and may be 100%. The presence of such flat fibers was measured by the following measurement method.

[ method for measuring the Presence of Flat fibers ]

The outer sheet 5 is taken out of the diaper 1, and the measuring sheet is cut out from an arbitrary region. The measuring sheet has a quadrangular shape (8 mm×4 mm) in a plan view, and is obtained by cutting the outer layer sheet 5 with a RAZOR (for example, a single-blade manufactured by FEATHER SAFETY RAZOR corporation). In the case of cutting the outer sheet 5, it is noted that the structure of the cut surface of the measuring sheet formed by the cutting is not broken by the pressure or the like at the time of cutting. A preferable cutting method is a method in which the outer sheet 5 is sufficiently frozen in liquid nitrogen before cutting the outer sheet 5, and then cutting is performed. The measuring sheet was attached to the sample stand using a paper double-sided tape (NICETACK NW-15 manufactured by NICHIBAN Co., ltd.). The measurement piece was then platinum coated. The coating was applied using an ion sputtering apparatus E-1030 (trade name) manufactured by Hitachi Keke Co., ltd.) for 30 seconds. Then, the cut surface of the measuring sheet was observed with a field emission scanning electron microscope S-4000 manufactured by Hitachi Corp. In the cut surface, the cross section of the fiber existing on the second surface 62 of the measuring sheet is observed, the long axis length and the short axis length of the cross section of the fiber are measured, and the long axis length is divided by the short axis length to calculate the flatness ratio of the fiber. The measurement was performed on 10 fibers, and the ratio of the number of fibers having a flattening ratio (major axis length/minor axis length) of 1.2 or more to the 10 fibers was obtained and used as the presence ratio (%) of flat fibers.

As a method for obtaining flat fibers, that is, fibers having a large degree of flattening of a cross section, there can be exemplified a known method such as 1) a method of spinning using a spinneret having a flattening ratio corresponding to a desired flattening ratio, or 2) a method of post-processing such as pressurizing a fiber deposit obtained using a usual spinneret (a cross section is a perfect circle or a shape based on this). The method of 2) above is preferable from the viewpoint of reliably orienting the long axis direction of the flat fibers in the plane direction of the nonwoven fabric and further improving the smoothness of the outer layer sheet 5. The method of 2) above can be carried out, for example, by heating a fiber aggregate (nonwoven fabric) containing fibers having a right circular cross section as needed, and pressurizing and compacting the fiber aggregate. Such a method can be implemented, for example, by a calendering process.

In the above-described structure (10), when non-fusible fibers that are not fused by heat or the like are contained in the non-skin-facing surface, non-fusible portions are formed when the constituent fibers are nonwoven. In the unwelded portion, the form of the constituent fibers can be maintained, so that the constituent fibers are easily moved against an external force, and friction can be reduced. From such a viewpoint, the content of the non-weldable fibers in the outer layer sheet 5 is preferably 0.1 mass% or more, more preferably 0.5 mass% or more, still more preferably 20.0 mass% or less, still more preferably 10.0 mass% or less, still more preferably 0.1 mass% or more and 20.0 mass% or less, still more preferably 0.5 mass% or more and 10.0 mass% or less, relative to the total mass of the outer layer sheet 5.

Examples of the non-weldable fibers include natural fibers such as pulp and cotton, and cellulosic fibers such as rayon, lyocell, and tencel, and 1 kind of these fibers may be used alone or 2 or more kinds may be mixed and used.

In the case where the outer sheet 5 is a hot air nonwoven fabric, it is particularly preferable to have any one or more of the above structures (8) to (10), and more preferably 2 or more of the above structures (8) to (10), from the viewpoint of further improving the smoothness or softness of the sheet.

From the viewpoint of providing a feel uniform to the entire diaper 1, it is preferable that the average friction coefficient of the components forming the skin-facing surface and the components forming the non-skin-facing surface of the diaper 1 be similar. That is, it is preferable that the average friction coefficient of the sheet member, which is a part capable of contacting the skin of the wearer in the wearing state, of the constituent members forming the skin-facing surface of the diaper 1 is in the following range. Examples of the "portion capable of coming into contact with the skin of the wearer" include the cuff forming sheet 16b, the sheet forming the skin-facing surface of the waist wing WF, the front sheet 2, and the like.

When the average friction coefficient of the flange forming sheet 16b is M3 and the average friction coefficient of the fastening outer region R2 is M2, the ratio of M3 to M2 (M3/M2) is preferably 0.75 or more, more preferably 0.8 or more, further preferably 1.25 or less, more preferably 1.2 or less, further preferably 0.75 or more and 1.25 or less, further preferably 0.8 or more and 1.2 or less.

The average friction coefficient M3 of the burring-forming sheet 16b is preferably 0.10 or more, more preferably 0.11 or more, still more preferably 0.25 or less, still more preferably 0.24 or less, still more preferably 0.10 or more and 0.25 or less, still more preferably 0.11 or more and 0.24 or less.

When the average friction coefficient of the skin-facing surface of the waist wing WF is M4 and the average friction coefficient of the fixation outer region R2 is M2, the ratio of M4 to M2 (M4/M2) is preferably 0.75 or more, more preferably 0.8 or more, still more preferably 1.25 or less, still more preferably 1.2 or less, still more preferably 0.75 or more and 1.25 or less, still more preferably 0.8 or more and 1.2 or less.

The average friction coefficient M4 of the skin-facing surface of the waist wing WF is preferably 0.10 or more, more preferably 0.11 or more, still more preferably 0.25 or less, still more preferably 0.24 or less, still more preferably 0.10 or more and 0.25 or less, still more preferably 0.11 or more and 0.24 or less.

The average friction coefficient of the skin-facing surface of the waist wing WF is synonymous with the average friction coefficient of the sheet member forming the skin-facing surface of the waist wing WF.

In the present embodiment, since the skin-facing surface of the waist wing WF is formed by the burring sheet 16b, the average friction coefficient M4 of the skin-facing surface of the waist wing WF is the average friction coefficient of the skin-facing surface of the burring sheet 16 b. Instead of this configuration, the skin-facing surface of the waist wing WF may be formed of a sheet member separate from the cuff forming sheet 16 b.

When the average friction coefficient of the front sheet 2 is M5 and the average friction coefficient of the fastening outer region R2 is M2, the ratio of M5 to M2 (M5/M2) is preferably 0.75 or more, more preferably 0.8 or more, further preferably 1.25 or less, more preferably 1.2 or less, further preferably 0.75 or more and 1.25 or less, more preferably 0.8 or more and 1.2 or less.

The average friction coefficient M5 of the front sheet 2 is preferably 0.10 or more, more preferably 0.11 or more, still more preferably 0.25 or less, more preferably 0.24 or less, still more preferably 0.10 or more and 0.25 or less, still more preferably 0.11 or more and 0.24 or less.

From the viewpoint of bringing the average friction coefficient into the above-described range, the cuff-forming sheet 16b, the sheet member forming the skin-facing surface of the waist wing WF, and the front sheet 2 preferably have any one or more of the above-described structures (1) to (10), and preferably any 2 or more of the structures (1) to (10), respectively. In this case, the "outer sheet 5" in the above-described structures (1) to (10) may be replaced with the "cuff forming sheet 16b", "sheet member forming the skin-facing surface of the waist wing WF", or the "front sheet 2".

As described above, the fastening region R1 of the present embodiment is constituted by the fastening member 6, and the fastening member 6 is joined to the non-skin-facing surface of the outer sheet 5 (see fig. 6).

When the fastening region R1 is formed of the fastening member 6, the thickness of each of the fastening member 6 and the outer layer sheet 5 is preferably in the following range from the viewpoint of facilitating the removal of the diaper 1 from the packaging bag 30.

The thickness of the fastening member 6 is preferably 10% or more, more preferably 20% or more, still more preferably 80% or less, still more preferably 70% or less, still more preferably 10% or more and 80% or less, still more preferably 20% or more and 70% or less, relative to the thickness of the outer layer sheet 5.

The thickness of the fastening member 6 is preferably 0.05mm or more, more preferably 0.1mm or more, still more preferably 0.5mm or less, still more preferably 0.4mm or less, still more preferably 0.05mm or more and 0.5mm or less, still more preferably 0.1mm or more and 0.4mm or less.

The thickness of the outer layer sheet 5 is preferably 0.05mm or more, more preferably 0.1mm or more, still more preferably 0.7mm or less, still more preferably 0.6mm or less, still more preferably 0.05mm or more and 0.7mm or less, still more preferably 0.1mm or more and 0.6mm or less.

The thicknesses of the outer layer sheet 5 and the fastening member 6 were measured using a noncontact laser displacement meter (for example, laser head LK-2100 manufactured by KEYENCE, displacement meter RV 3-55R). The pressure at the time of thickness measurement was 1.7kPa. The measurement was performed 5 times, and the average value was used as each thickness of the outer layer sheet 5 and the fastening member 6.

The fastening member 6 of the present embodiment has a low-thickness region (not shown) having a thickness of less than 50% of the maximum thickness of the fastening member 6. The low-thickness region can be formed by applying a pressurizing process such as an embossing process to the fixing member 6.

The area of the low-thickness region is preferably 30% or more, more preferably 35% or more, still more preferably 90% or less, still more preferably 85% or less, still more preferably 30% or more and 90% or less, still more preferably 35% or more and 85% or less, with respect to the area of the fastening member 6, from the viewpoint of facilitating removal of the diaper 1 from the packaging bag.

The area of the low thickness region relative to the area of the stationary member 6 is measured by the following method.

First, a measuring piece having a size of 60mm in the longitudinal direction and 30mm in the transverse direction was cut out from the fastening member 6. The measuring sheet was placed on a horizontal table with a non-skin-facing surface facing upward, and in a non-pressurized state. A transparent acrylic plate was placed on the measuring sheet, and a weight was further placed on the acrylic plate, so that the measuring sheet was pressurized at 1.7 kPa. Then, the surface shape of the surface of the measurement object in the pressed measurement piece was measured by a high-precision shape measurement system KS-1100 manufactured by Keyence. Specifically, the thickness at each position in the measurement piece is measured. The measurement conditions were set to a measurement pitch of 50 μm and a movement speed of 10cm/s, and a measurement range of 30mm in the longitudinal direction by 30mm in the transverse direction was measured. The measurement results (images) thus obtained were analyzed by a shape analysis application KS-Analyzer manufactured by Keyence Co. Then, a position at which the maximum thickness is obtained in the measurement piece and a position at which the thickness is 50% or more of the maximum thickness are extracted as a "high-thickness region". In addition, a position where the thickness with respect to the maximum thickness in the measurement piece is less than 50% is taken as a "low thickness region". The areas of the low-thickness regions were measured by subjecting these high-thickness regions and low-thickness regions to binarization processing. Specifically, the Image was taken into Image-Pro Plus manufactured by NIPPON ROPER, inc., and the contrast was set to 100 by contrast emphasis. After noise was removed by the filtering process (median, 5×5 times), a counting process was performed to measure the total area of the low thickness region shown in white or black. Then, the total area of the low-thickness regions was divided by the area of the measuring sheet (30 mm in the longitudinal direction×30mm in the transverse direction), and the area of the low-thickness regions with respect to the area of the fastening member 6 was obtained.

The fastening member 6 of the present embodiment has a shape long in the lateral direction Y in plan view. The fastening members 6 are joined to the non-skin-facing surfaces of the outer sheet 5 at both ends in the longitudinal direction X. Specifically, as shown in fig. 6, the fixing member 6 has joint regions 61, 61 at both ends in the longitudinal direction X, respectively, where the fixing member 6 and the outer sheet 5 are joined.

From the viewpoint of facilitating removal of the diaper 1 from the package bag 30, the length L6 (see fig. 6) of the joint region 61 in the transverse direction Y is preferably 80% or more, more preferably 85% or more, relative to the entire length of the fastening member 6 in the transverse direction Y. The upper limit of the ratio of the length L6 of the lateral direction Y of the joining region 61 to the entire length of the lateral direction Y of the fastening member 6 is not particularly limited, but is preferably 100% from the same point of view as described above, that is, the fastening member 6 is preferably joined continuously to the outer sheet 5 over the entire length of the lateral direction Y of the fastening member 6 at the end of the longitudinal direction X.

In the present embodiment, the outer layer sheet 5 and the fastening member 6 are joined via an adhesive. As the adhesive, a known adhesive such as a hot melt adhesive can be applied.

The amount of adhesive used to join the outer sheet 5 and the fastening member 6 is 10g/m from the standpoint of ensuring the joining strength between the outer sheet 5 and the fastening member 6 and further improving the feel of the non-skin-facing surface of the diaper 1 ² The above is more preferably 15g/m ² The above is preferably 30g/m ² Hereinafter, more preferably 25g/m ² Hereinafter, it is more preferably 10g/m ² Above and 30g/m ² Hereinafter, it is more preferably 15g/m ² And 25g/m ² The following is given.

The materials forming the respective portions of the diaper according to the above embodiment will be described in detail. As the leakage preventing sheet 3 and the absorber 4, materials conventionally used in absorbent articles can be used without particular limitation.

As the leakage preventing sheet 3, a resin film which is hardly permeable to liquid, a laminate of a resin film and a nonwoven fabric, or the like can be used.

As the absorbent core 4a in the absorbent body 4, an aggregate of hydrophilic fibers such as wood pulp and hydrophilized synthetic fibers, or a material for retaining a water-absorbent polymer in the aggregate can be used. As the core sheet 4b, a material similar to the material forming the front sheet 2 described later can be used.

As the sheet members of the outer sheet 5, the front sheet 2, the cuff-forming sheet 16b, and the like, which form the skin-facing surface of the diaper 1, nonwoven fabrics based on various production methods can be used, and for example, spunbond nonwoven fabrics, hot air nonwoven fabrics, spunlaced nonwoven fabrics, hot-rolled nonwoven fabrics, melt-blown nonwoven fabrics, laminated nonwoven fabrics thereof, and the like can be used. Examples of the laminated nonwoven fabric include laminated nonwoven fabrics (SM nonwoven fabric, SMs nonwoven fabric) including a spunbond nonwoven fabric layer (S).

The outer sheet 5 and the front sheet 2 may be constituted by one sheet, or may be constituted by a laminate of a plurality of sheets instead of the above-described structure.

As the burring sheet 16b, a water repellent nonwoven fabric can be used.

The elastic members such as the cuff forming elastic member 16a and the leg gather forming elastic member 15 in the leakage preventing cuff 16 can be made of various known elastic materials commonly used in such an absorbent article without particular limitation. Examples of the elastic material include synthetic rubber such as styrene-butadiene, isoprene, and chloroprene rubber, natural rubber, EVA, stretchable polyolefin, and polyurethane. As the form of the elastic member, a linear elastic member having a rectangular, square, circular, polygonal or the like cross section (such as a linear rubber) or a string-like (such as a flat rubber) or a multifilament-like linear elastic member is preferably used.

The materials forming the belt base 70 and the engaging portion 71 of the fastening member 6 and the fastening tape 7 may be used without any particular limitation as long as they are materials commonly used in an unfolding type disposable diaper. The shape of the engagement projection in the engagement portion 71 is not particularly limited, and a sickle (hook), an anchor, a hook shape, or the like can be used.

For example, mechanical fasteners such as "Magic Tape (registered trademark)" (manufactured by KURARAY corporation) "," Quicklon (registered trademark) "(manufactured by YKK corporation)", and "Magicloth (registered trademark)" (manufactured by Kanebo Belltouch corporation) can be used as the fastening members 6 or the fastening members 7 and the outer sheet 5. In the case where a nonwoven fabric is used for the fixing member 6, a hot air nonwoven fabric is preferable from the viewpoint of easy engagement.

As a material for forming the tape base material 70, a synthetic resin such as polyethylene, polypropylene, polyethylene terephthalate, or a sheet or nonwoven fabric made of a composite material of 2 or more kinds of these synthetic resins can be used.

The present utility model has been described based on preferred embodiments thereof, but the present utility model is not limited to the above-described embodiments.

The absorbent article is a so-called developed disposable diaper having a fastening tape, but may be applied to, for example, a diaper cover (pad holder) or a belt-like body worn on the waist, and may be an article for infants or an article for adults. The absorbent article of the present utility model broadly includes articles for absorbing body fluids (urine, soft feces, menstrual blood, sweat, etc.) discharged from a human body. Such as incontinence pads, sanitary napkins, panty liners and the like.

With respect to the above-described embodiments of the present utility model, the following absorbent articles are further disclosed.

An absorbent article having a longitudinal direction corresponding to the front-rear direction of a wearer and a transverse direction orthogonal to the longitudinal direction, and having a crotch portion arranged in the crotch of the wearer, and a front-rear extending side portion and a rear-side portion, and comprising a fastening tape provided on both side edge portions of the rear-side portion along the longitudinal direction, and a fastening region provided on the front-side portion and capable of fastening the fastening tape,

the non-skin-facing surface has the fastening region and a region other than the fastening region, at least the region other than the fastening region being formed of an outer sheet,

the average friction coefficient of the region other than the fixed connection region is less than 0.20,

when the average friction coefficient of the fixed region is M1 and the average friction coefficient of the region other than the fixed region is M2, the ratio of M1 to M2 (M1/M2) is 0.75 to 1.25.

<2>

The absorbent article according to the above <1>, wherein,

the average friction coefficient M2 of the region other than the fixed region is 0.10 to 0.20, preferably 0.11 to 0.19.

<3>

The absorbent article according to the above <1> or <2>, wherein,

the distance between fibers in the fastening region is 50 μm or more and 250 μm or less, preferably 70 μm or more and 200 μm or less.

<4>

The absorbent article according to any one of the above <1> to <3>, wherein,

the device comprises: an absorbent body comprising a liquid-retentive absorbent member; and a pair of leakage-proof cuffs disposed along both side portions of the absorbent body in the longitudinal direction,

the leakage preventing cuff has a cuff forming sheet and an elastic member extending in the longitudinal direction at a free end portion,

when the average friction coefficient of the burring-forming sheet is M3 and the average friction coefficient of the region other than the fastening region is M2, the ratio of M3 to M2 (M3/M2) is 0.75 to 1.25.

<5>

The absorbent article according to the above <4> or <5>, wherein,

the average friction coefficient M3 of the burring-forming sheet is 0.10 to 0.25, preferably 0.11 to 0.24.

<6>

The absorbent article according to any one of the above <1> to <5>, wherein,

the device comprises: a liquid-retentive absorbent member; and waist wing portions extending from the peripheral edge of the absorber to the outside in the longitudinal direction or the outside in the transverse direction on the longitudinal end portions side of the abdomen side portion and the back side portion, respectively,

When the average friction coefficient of the skin-facing surface of the waist wing is M4 and the average friction coefficient of the region other than the fastening region is M2, the ratio of M4 to M2 (M4/M2) is 0.75 to 1.25.

<7>

The absorbent article according to the above <6>, wherein,

the average friction coefficient M4 of the skin-facing surface of the waist wing is 0.10 to 0.24, preferably 0.11 to 0.25.

<8>

The absorbent article according to any one of the above <1> to <7>, wherein,

the device comprises: a liquid-retentive absorbent member; and a front sheet disposed on the skin-facing surface side of the absorber and contacting the skin of the wearer in a worn state,

when the average friction coefficient of the front sheet is M5 and the average friction coefficient of the region other than the fastening region is M2, the ratio of M5 to M2 (M5/M2) is 0.75 to 1.25.

<9>

The absorbent article according to the above <8>, wherein,

the front sheet has an average friction coefficient M5 of 0.10 to 0.25, preferably 0.11 to 0.24.

<10>

The absorbent article according to any one of the above <1> to <9>, wherein,

the front sheet is disposed on the skin-facing surface side of the absorber and contacts with the skin of the wearer in a wearing state,

the outer sheet, the cuff-forming sheet, the sheet member forming the skin-facing surface of the waist wing, and one or more of the front sheet are each formed of at least one of the following structures (1) to (10),

structure (1): the fineness of the constituent fibers is 0.05dtex or more and 2.0dtex or less,

structure (2): the non-skin-facing surface is formed with irregularities,

structure (3): a plurality of openings are formed in the base plate,

structure (4): the constituent fibers in the non-skin-facing side are oriented in the machine direction,

structure (5): embossing the non-skin-facing surface,

structure (6): the non-skin-facing surface is subjected to a gap blocking treatment,

structure (7): the sheet may be provided with a softening agent,

structure (8): the constituent fibers include hollow fibers,

Structure (9): flat fibers are present on the non-skin opposing side,

structure (10): the non-skin-facing surface contains non-fusible fibers.

<11>

The absorbent article according to the above <10>, wherein,

the irregularities in the structure (2) are formed in a direction having an angle with respect to the transverse direction, and preferably in a direction along the longitudinal direction.

<12>

The absorbent article according to the above <10>, wherein,

the area ratio of the openings per unit area of the structure (3) is 5% or more and 25% or less, preferably 10% or more and 20% or less.

<13>

The absorbent article according to the above <10>, wherein,

in the structure (4), when the non-skin-facing surface is observed by an electron microscope, the constituent fibers forming an angle of ±30 degrees or less with respect to the longitudinal direction with respect to all the constituent fibers in the field of view are 70% or more.

<14>

The absorbent article according to the above <10>, wherein,

the embossed portion of the structure (5) formed by the embossing process has an area ratio of the embossed portion per unit area in the non-skin-facing surface of 5% to 25%, preferably 10% to 20%.

<15>

The absorbent article according to the above <10>, wherein,

Regarding the embossed portion of the structure (5) formed by the embossing treatment, the area of the embossed portion in the non-skin-facing surface is 0.3mm ² Above and 10mm ² Hereinafter, it is preferably 0.5mm ² Above and 7mm ² The following is given.

<16>

The absorbent article according to the above <10>, wherein,

with respect to the structure (6), the void-clogging treatment is a heat treatment, an ultrasonic treatment, or a coating treatment.

<17>

The absorbent article according to item <16> above, wherein,

the liquid used in the coating treatment is a liquid in which volatile components in the liquid volatilize after coating, and only solid components remain in the sheet.

<18>

The absorbent article according to item <17> above, wherein,

the liquid is natural extract, oil or ink for printing.

<19>

The absorbent article according to the above <10>, wherein,

with respect to the structure (7), the content of the softening agent in the sheet is 0.03 mass% or more and 10 mass% or less, preferably 0.1 mass% or more and 6 mass% or less.

<20>

The absorbent article according to the above <10>, wherein,

with respect to the structure (8), the grammage of the hollow fibers in the sheet was 5g/m ² Above and 20g/m ² Hereinafter, it is preferably 8g/m ² Above and 15g/m ² The following is given.

<21>

The absorbent article according to the above <10>, wherein,

in the structure (9), the flat fibers are present in the non-skin-facing surface at a rate of 60% or more, preferably 70% or more, and 100% or less.

<22>

The absorbent article according to the above <10>, wherein,

in the structure (10), the content of the non-weldable fibers is 0.1 mass% or more and 20.0 mass% or less, preferably 0.5 mass% or more and 10.0 mass% or less, relative to the total mass of the sheet.

<23>

The absorbent article according to the above <10>, wherein,

the non-weldable fibers comprise either or both of natural fibers and cellulosic fibers,

the natural fiber is 1 or 2 of pulp and cotton,

the cellulose fiber is 1 or more than 2 of rayon, lyocell and tencel.

<24>

The absorbent article according to any one of <10> or <20> to <22>, wherein,

the outer sheet, the cuff-forming sheet, the sheet member forming the skin-facing surface of the waist wing, and one or more of the front sheet are hot air nonwoven fabrics,

any one or more, preferably 2 or more, of the structures (8) to (10) are provided.

<25>

The absorbent article according to any one of the above <1> to <24>, wherein,

the fixing area is composed of a fixing component capable of fixing the fastening tape,

the thickness of the fastening member is 80% or less relative to the thickness of the outer sheet.

<26>

The absorbent article according to any one of the above <1> to <25>, wherein,

the fixing area is composed of a fixing part capable of fixing the fastening tape, the fixing part is provided with a low-thickness area with the thickness smaller than 50% relative to the maximum thickness of the fixing part,

the area of the low-thickness region is 30% or more relative to the area of the fastening member.

<27>

The absorbent article according to any one of the above <1> to <26>, wherein,

the fixing area is composed of fixing parts capable of fixing the fastening tape, the fixing parts are respectively provided with a joint area jointed with the non-skin opposite surface of the outer layer sheet at two ends of the longitudinal direction,

the length of the joint region in the lateral direction is 80% or more of the entire length of the fastening member in the lateral direction.

<28>

The absorbent article according to any one of the above <1> to <27>, wherein,

the area of the fastening region is 30% or less relative to the area of the outer sheet.

<29>

The absorbent article according to item <28> above, wherein,

the area of the fastening region is 3% to 30%, preferably 5% to 25%, of the area of the outer sheet.

<30>

A package body, wherein,

the absorbent article according to any one of <1> to <29> above, wherein a plurality of absorbent articles are contained in the package bag in a state in which the fastening regions do not contact each other.

<31>

The package according to <30> above, wherein,

the absorbent article is folded in half at the substantially center of the crotch portion so as to equally divide the entire length 2 in the longitudinal direction, and a plurality of the folded absorbent articles are arranged and stored in the packaging bag in a state of being compressed in the thickness direction, and the non-skin facing surface of the abdomen side portion and the non-skin facing surface of the back side portion of the adjacent absorbent articles are in contact with each other.

Examples

The present utility model will be described in more detail with reference to examples. The scope of the utility model is not limited to these examples. Unless otherwise indicated, "%" means "% by mass".

[ example 1 ]

A hot air nonwoven fabric comprising constituent fibers having a fineness of 1.3dtex and comprising composite fibers of polyethylene and polyethylene was prepared, and one surface of the nonwoven fabric was subjected to a calendering treatment to prepare a hot air nonwoven fabric having flat fibers. The fastening member 6 is fixed to the one surface of the nonwoven fabric by an adhesive (a rubber-based general-purpose hot-melt adhesive), and is formed as an outer sheet 5 having a fastening region R1 and an outer fastening region R2. The usage amount of the adhesive is 20g/m ² 。

As the fastening member 6, a hot air nonwoven fabric composed of a constituent fiber having a fineness of 6.1dtex and composed of a composite fiber of polypropylene and polyethylene was used.

As the burring sheet 16b, an SMS nonwoven fabric composed of a polypropylene and a spunbond surface layer composed of a constituent fiber having a fineness of 1.8dtex was prepared. The nonwoven fabric is subjected to embossing treatment and softening treatment with a softening agent.

An SMS nonwoven fabric comprising a polypropylene and a spunbond top layer comprising constituent fibers having a fineness of 1.8dtex was prepared as a sheet for forming the skin-facing surface of the waist wing WF. One surface of the nonwoven fabric was subjected to embossing treatment and softening treatment with a softener.

As the fastening tape 7, a member having an engaging portion 71 made of polypropylene was prepared.

The diaper according to the embodiment shown in fig. 1 described above was produced using the outer sheet 5, the fastening member 6, the flange forming sheet 16b, and the fastening tape 7 described above. The skin-facing surface sheet forming the waist wing WF is disposed so as to extend outward in the lateral direction Y from the base end portion of the rising portion of the burring forming sheet 16b, and is joined to the adjacent constituent member by an adhesive. In addition to the above-mentioned sheet members, commercially available components (absorbent bodies and the like) of a diaper "Merries S size" are used.

[ example 2 ]

A hot air nonwoven fabric was obtained by mixing a constituent fiber having a fineness of 1.8dtex and composed of a composite fiber of polyethylene terephthalate and cotton (5 mass% relative to the mass of the composite fiber) as a non-fusible fiber, integrating the composite fiber with the cotton, and then subjecting the resultant to a hot air treatment. The hot air nonwoven fabric was used as the outer sheet 5.

As the fastening member 6, a hot air nonwoven fabric composed of a constituent fiber having a fineness of 4.4dtex and composed of a composite fiber of polyethylene and polyethylene was used.

An SMS nonwoven fabric composed of polypropylene and a spunbond top layer composed of constituent fibers having a fineness of 1.4dtex was used as the cuff forming sheet 16b and the skin-facing sheet forming the waist wing WF.

As the front sheet 2, a hot air nonwoven fabric composed of a constituent fiber having a fineness of 3.1dtex and composed of a composite fiber of polyethylene and polyethylene was used.

A diaper 1 was produced in the same manner as in example 1, except for the point of using the above-described constituent members. The outer sheet 5 of the diaper 1 obtained in example 2 contains cotton on the non-skin-facing surface.

Comparative example 1

A hot air nonwoven fabric composed of a constituent fiber having a fineness of 3.0dtex and composed of a composite fiber of polyethylene and polyethylene was prepared as the outer layer sheet 5.

As the fastening member 6, SMS nonwoven fabric composed of polypropylene and having a spunbond surface layer composed of constituent fibers having a fineness of 1.8dtex was used.

As the cuff forming sheet 16b and the sheet on the skin-facing side forming the waist wing WF, SMS nonwoven fabric composed of polypropylene and having a spunbond top layer composed of constituent fibers having a fineness of 1.8dtex was used.

As the front sheet 2, a hot air nonwoven fabric composed of a constituent fiber having a fineness of 4.5dtex and composed of a composite fiber of polyethylene and polyethylene was used.

A diaper was produced in the same manner as in example 1, except that the above-described constituent members were used.

Comparative example 2

A hot air nonwoven fabric composed of a constituent fiber having a fineness of 2.3dtex and composed of a composite fiber of polyethylene and polyethylene was prepared as the outer layer sheet 5.

As the fastening member 6, a spun-bonded nonwoven fabric composed of constituent fibers of polypropylene having a fineness of 3.2dtex was used.

As the burring sheet 16b, an SMS nonwoven fabric composed of a polypropylene and a spunbond surface layer composed of a constituent fiber having a fineness of 2.0dtex was used.

As the sheet forming the skin-facing surface of the waist wing WF, a spunbonded nonwoven fabric composed of constituent fibers of polypropylene having a fineness of 2.7dtex was used.

As the front sheet 2, a hot air nonwoven fabric composed of a constituent fiber having a fineness of 4.4dtex and composed of a composite fiber of polyethylene and polyethylene was used.

For the diapers of each of the examples and comparative examples, the average friction coefficients of the fastening regions R1 and R2 of the outer sheet, the cuff forming sheet 16b, the skin-facing surface of the waist wing WF, and the front sheet were measured. These measurements were performed as described above. The ratio of the average friction coefficients was obtained. The measurement results are shown in table 1. In table 1, M1 is the average friction coefficient of the fastening region R1, M2 is the average friction coefficient of the fastening outer region R2, M3 is the average friction coefficient of the burring forming sheet 16b, M4 is the average friction coefficient of the skin-facing surface of the waist wing WF, and M5 is the average friction coefficient of the front sheet.

[ force of engagement between fastening tape and fastening region ]

The fastening force between the fastening tape 7 and the fastening region R1 was evaluated by the following method for the diapers of each of the examples and the comparative examples. The fastening tape 7 is placed on the fastening region R1, and a 1kg roller is reciprocated 3 times on the fastening region R1, so that the fastening tape 7 is fastened to the fastening region R1. Then, the edge of the hook and loop fastener 7 was clamped by a clip, and connected to a push-pull gauge (manufactured by RX-20, AIKOH ENGINEERING). Then, the push-pull meter is pulled until the fastening tape 7 is separated from the fastening region R1, and the fastening strength between the fastening tape 7 and the fastening region R1 is measured. The above-mentioned engaging force was evaluated according to the following criteria. When the engagement strength is 2.0N or more, it can be determined that the engagement force of the fastening tape and the fastening member is sufficient. The evaluation results are shown in table 1.

A: the engagement strength is 2.0N or more.

B: the engagement strength is less than 2.0N.

[ easy removal of diaper from packaging bag ]

The diapers of each of the examples and comparative examples were evaluated for ease of removal from the package bags by the following method (see fig. 7). First, 2 diapers were prepared which were folded in half at the approximate center of the crotch portion C so as to equally divide the entire length 2 in the longitudinal direction X. One diaper 1a is placed with the back side portion B facing downward on a flat surface, and the end portion in the longitudinal direction X of the one diaper 1a is fixed with an adhesive tape. In this one diaper 1a, the other diaper 1B is overlapped so that the back side portion B is downward and so that the positions of the crotch portions C of the 2 diapers 1a and 1B are aligned. Next, 2kg of the weight 20 was placed on the fastening region R1 of the other diaper 1 b. In this way, the other diaper 1b was brought into contact with the other diaper 1a and a load of 2kg was applied in the thickness direction to be compressed, which is a pseudo-packaging state in which the diapers were housed in the packaging bags (see fig. 7). Then, the end of the crotch portion C of the other diaper 1b was clamped by a clamp, and connected to a push-pull gauge 21 (RX-20, manufactured by AIKOH ENGINEERING). Next, the push-pull gauge 21 was pulled in the horizontal direction, and the maximum pulling strength was measured. The ease of removal of the diaper from the package was evaluated according to the following criteria. When the maximum pulling strength is less than 10N, the resistance when the diaper is taken out of the package bag is low, and therefore, it can be judged that the diaper is easy to take out. The evaluation results are shown in table 1.

A: the maximum pulling strength is less than 10N.

B: the maximum pulling strength is more than 10N.

TABLE 1

As shown in table 1, the maximum pull strength of the diaper of each example in the simulated package state was less than 10N, and the fastening strength of the fastening tape to the fastening region was 2.0N or more. From this result, it was shown that the diapers of the respective examples can ensure the engagement force between the fastening tape and the fastening member, and can be easily taken out from the packaging bag. In addition, in the diapers of the examples, the skin touch on the non-skin-facing side of the outer sheet was smooth and had a uniform feel throughout, and the feel was good. In particular, the diaper of example 1 was excellent in uniformity of the touch feeling of the non-skin-facing surface and the touch feeling of the skin-facing surface.

On the other hand, the diaper of comparative example 1 had a maximum pull strength of 10N or more in the simulated package state, and the diaper of comparative example 2 had no uniform skin feel on the non-skin-facing side of the outer sheet, and had poor touch.

Industrial applicability

According to the absorbent article of the present utility model, the fastening force of the fastening tape can be ensured, the touch of the absorbent article is excellent, and the absorbent article can be easily taken out from the packaging bag.

Claims

1. An absorbent article having a longitudinal direction corresponding to a front-rear direction of a wearer and a transverse direction orthogonal to the longitudinal direction, and having a crotch portion arranged in a crotch portion of the wearer, and a front-rear extending side portion and a rear-side portion, and including a fastening tape provided on both side edge portions of the rear-side portion along the longitudinal direction, and a fastening region provided on the front-side portion capable of fastening the fastening tape, the absorbent article being characterized in that:

when the average friction coefficient of the fixed region is M1 and the average friction coefficient of the region other than the fixed region is M2, the ratio of M1 to M2 (M1/M2) is 0.75 to 1.25,

the fixing area is composed of a fixing part capable of fixing the fastening tape, the fixing part is a part separated from the outer layer sheet,

2. The absorbent article of claim 1, wherein:

3. The absorbent article of claim 1 or 2, wherein:

4. The absorbent article of claim 1, wherein:

5. The absorbent article of claim 1, wherein:

the fastening member has a low thickness region having a thickness of less than 50% relative to a maximum thickness of the fastening member,

6. The absorbent article of claim 1, wherein:

the fastening members each have a joining region at each of both ends in the longitudinal direction for joining to a non-skin-facing surface of the outer sheet,

7. The absorbent article of claim 1, wherein:

8. A package, characterized in that:

the absorbent article according to claim 1, wherein a plurality of the absorbent articles are contained in the package in a state where the fastening regions are not in contact with each other.