WO2015151757A1 - 吸収性物品 - Google Patents
吸収性物品 Download PDFInfo
- Publication number
- WO2015151757A1 WO2015151757A1 PCT/JP2015/057346 JP2015057346W WO2015151757A1 WO 2015151757 A1 WO2015151757 A1 WO 2015151757A1 JP 2015057346 W JP2015057346 W JP 2015057346W WO 2015151757 A1 WO2015151757 A1 WO 2015151757A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- absorbent
- sheet
- absorbent article
- nonwoven fabric
- convex portion
- Prior art date
Links
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Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers of the pads
- A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
- A61F13/51104—Topsheet, i.e. the permeable cover or layer facing the skin the top sheet having a three-dimensional cross-section, e.g. corrugations, embossments, recesses or projections
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
- A61F13/49—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape specially adapted to be worn around the waist, e.g. diapers, nappies
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/539—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium characterised by the connection of the absorbent layers with each other or with the outer layers
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
- A61F2013/4587—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape with channels or deep spot depressions on the upper surface
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/539—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium characterised by the connection of the absorbent layers with each other or with the outer layers
- A61F2013/53908—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium characterised by the connection of the absorbent layers with each other or with the outer layers with adhesive
Definitions
- the present invention relates to an absorbent article formed by joining a topsheet having an uneven structure and an absorbent element.
- Absorbent articles such as disposable diapers, sanitary napkins, and panty liners are usually used in direct contact with the user's skin and may be worn for a long time. Therefore, the absorbent article is required to have a gentle skin contact and excellent absorbability and retention of liquid such as urine, menstrual blood and excrement.
- patent document 1 in the surface sheet which comprises the skin surface side surface of an absorbent article, it has a soft cushioning property, a return is good when it presses, it excels in excretion collection property, especially liquid
- a surface sheet excellent in pullability as a nonwoven fabric constituting the surface sheet, a first protruding portion protruding to the first surface side, and a second surface side opposite to the first surface side
- a technique using an uneven nonwoven fabric provided with a plurality of protruding second protruding portions alternately is disclosed.
- the uneven nonwoven fabric disclosed in Patent Document 1 has a fiber density on the second surface side at the top of the first projecting portion so that the transferability of liquid such as excrement is smooth.
- the fiber density of the uneven nonwoven fabric is lower than the fiber density on the surface side, and the fiber density on the first surface side and the fiber density on the second surface side are substantially equal at the top of the second protrusion.
- the fiber density in the direction is configured to change from sparse to dense from the skin surface side toward the absorber surface side.
- the fiber density on the uneven nonwoven fabric side (that is, the second surface side at the top of the second protruding portion) Fiber density) becomes the highest density, so that it is difficult to be deformed, and the cushioning property, the return when pressed, and the like are inferior.
- the shape of the joint is a point joint having a small joint area, there is a problem that body fluid such as urine and menstrual blood is easily drawn, that is, liquid transferability is poor.
- the present invention provides an absorbent article having a soft cushioning property, good return when pressed, excellent excretion collecting ability, and excellent liquid transfer from the topsheet to the absorbent element.
- the purpose is to provide.
- the absorbent article of the present invention is a surface sheet having a concavo-convex structure used on the skin surface side of the absorbent article, on the clothing side opposite to the first convex portion protruding to the skin surface side and the skin surface side.
- the joint between the topsheet having the concavo-convex structure and the absorbent element is not a point joint having a small joint area as in the prior art, but has a planar form.
- the bonding area between the topsheet and the absorbent element is widened, and the range in which body fluids such as urine and menstrual blood discharged on the topsheet can migrate to the absorbent element is widened.
- the said junction part is a planar form, in addition to being able to improve liquid transferability as mentioned above, it calculates
- an absorbent article having a soft cushioning property, good return when pressed, excellent in excretion collecting ability, and excellent in liquid transfer from a topsheet to an absorbent element. Can be provided.
- FIG. 1 is a perspective view of a disposable diaper that is an embodiment of the absorbent article of the present invention.
- FIG. 2 is a plan view of the disposable diaper of FIG. 1 in a developed state.
- FIG. 3 is a partial plan view of a surface sheet used for the absorbent article of the present invention.
- FIG. 4 is a partial cross-sectional view of the Z-Z ′ cross section in FIG. 3.
- FIG. 5 is a schematic view of the manufacturing equipment for the uneven nonwoven fabric constituting the top sheet.
- FIG. 6 is an electron micrograph of the cut surface at the top of the first convex portion of the uneven nonwoven fabric constituting the surface sheet used in the absorbent article of the present invention.
- Drawing 7 is a mimetic diagram for explaining the distribution state of the fiber density before and after joining of the uneven nonwoven fabric which constitutes a surface sheet, and an absorption element.
- FIG. 8 is an electron micrograph of a cut surface at the joint between the uneven nonwoven fabric constituting the top sheet and the nonwoven fabric on the absorbent element side.
- FIG. 9 is an electron micrograph of the cut surface at the joint of the laminate sample of Example 1.
- FIG. 10 is an electron micrograph of the cut surface at the joint of the laminate sample of Example 2.
- FIG. 1 is a perspective view of a disposable diaper that is an embodiment of the absorbent article of the present invention
- FIG. 2 is a plan view of a state in which the disposable diaper of FIG. 1 is developed.
- the disposable diaper 1 which is one Embodiment of this invention is the front part 11 applied to a wearer's abdomen, the intermediate part 12 applied to a wearer's crotch part, and a wearer. And a rear surface portion 13 applied to the back portion and / or the back portion.
- FIG. 1 is a perspective view of a disposable diaper that is an embodiment of the absorbent article of the present invention
- FIG. 2 is a plan view of a state in which the disposable diaper of FIG. 1 is developed.
- the disposable diaper 1 which is one Embodiment of this invention is the front part 11 applied to a wearer's abdomen, the intermediate part 12 applied to a wearer's crotch part, and a wearer.
- a rear surface portion 13 applied to the back portion and / or the
- the side portions 111 a and 111 b of the front surface portion 11 and the both side portions 131 a and 131 b of the rear surface portion 13 are joined to each other.
- a waist opening is formed by the end portion 132 of the surface portion 13
- leg openings are formed by both side portions 121 a and 121 b of the intermediate portion 12, and the disposable diaper 1 has a pants-type shape. .
- the disposable diaper 1 includes a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and an absorbent element 4 provided between the top sheet 2 and the back sheet 3.
- the cover sheet 5 provided on the skin surface side surface of the topsheet 2 has an opening 51 formed at substantially the center, and a part of the topsheet 2 (a part of the arrangement region of the absorbent element 4) is It is exposed from the opening 51 of the cover sheet 5 and constitutes the skin surface side surface of the disposable diaper 1 together with the cover sheet 5.
- One end of each of the leak-proof cuffs 6 a and 6 b provided on both sides of the opening 51 of the cover sheet 5 is a fixed end sandwiched between the top sheet 2 and the cover sheet 5. The other end is a free end exposed from the opening 51 of the cover sheet 5.
- Elastic portions 61a and 61b extending in the longitudinal direction Y of the disposable diaper 1 are provided at the free ends of the leak-proof cuffs 6a and 6b.
- the leak-proof cuffs 6a and 6b are directed toward the skin surface of the wearer. Standing up.
- elastic members 81, 82, 83, and 84 are provided between the back sheet 3 and the cover sheet 5, which are hourglass shapes having substantially the same dimensions.
- a waist gather is formed in the waist opening due to the elastic contraction force of the elastic members 81 and 82, and a leg gather (a cuff on the leg side) is formed in the leg opening due to the elastic contraction force of the elastic members 83 and 84. ) Is formed. Leakage of excrement from the leg opening can be prevented by this leg gather.
- the width direction X refers to the width direction (short direction) in planar view in the disposable diaper 1 (absorbent article) in the unfolded state
- the longitudinal direction Y is the disposable in the unfolded state.
- the diaper 1 (absorbent article) it refers to the longitudinal direction (front and rear direction of the wearer) in plan view
- the width direction X and the longitudinal direction Y are orthogonal to each other in plan view.
- FIG. 3 is a partial plan view of a surface sheet used for the absorbent article of the present invention.
- FIG. 4 is a partial cross-sectional view of the Z-Z ′ cross section in FIG. 3, and particularly shows a bonded state of the bonded portion between the topsheet 2 made of an uneven nonwoven fabric and the absorbent element 4.
- the topsheet 2 has a first convex portion 21 projecting toward the skin surface with respect to the center plane A parallel to the planar direction of the topsheet 2, and the skin surface with respect to the centerplane A. It is a nonwoven fabric having a concavo-convex structure in which a second convex portion 22 protruding to the clothing side opposite to the side is formed. And the said surface sheet 2 and the said absorption element 4 are joined by the planar form in the junction part of the top part 22T of the said 2nd convex part 22. As shown in FIG.
- the first convex portion 21 of the topsheet 2 has a substantially cylindrical shape in appearance, but the absorbent article of the present invention is not limited to this.
- the first convex portion or the second convex portion of the surface sheet is, for example, a columnar shape such as an elliptical column shape or a polygonal column shape, a cone shape such as a cone shape or a pyramid shape, a truncated cone shape such as a truncated cone shape or a truncated pyramid shape, etc. It can be formed into an arbitrary shape, and further can be formed into a hemispherical shape in order to obtain a softer cushioning property.
- shapes in which the skin side and clothing side surfaces such as a columnar shape, an elliptical columnar shape, a prismatic shape, a truncated cone shape, and a truncated pyramid shape are formed flat.
- the convex portion can come into contact with the skin surface of the wearer, and body fluid such as urine and menstrual blood adhering to the skin surface can be easily drawn into the clothing side. can do.
- the height of the first and second convex portions is not particularly limited, but cushioning properties and texture, From the viewpoint of prevention of liquid return, etc., for example, it is in the range of 0.1 mm to 6.0 mm, preferably 0.2 mm to 5.0 mm, more preferably 0.2 mm to 4.0 mm.
- the thickness of the surface sheet is not particularly limited, and any thickness can be adopted. However, from the viewpoint of an appropriate cushioning property, texture, liquid return prevention property, liquid transfer property, etc., for example, within a range of 0.1 mm to 10.0 mm. Preferably, it is in the range of 0.5 mm to 7.0 mm, more preferably 1.0 mm to 5.0 mm.
- the top sheet is preferably made of a nonwoven fabric.
- the fiber used for the nonwoven fabric is not particularly limited, but for example, natural fibers such as wool and cotton; regenerated fibers such as rayon and acetate; and polyolefins such as polyethylene (PE), polypropylene (PP), and polybutylene; ethylene -Vinyl acetate copolymer (EVA); ethylene-ethyl acrylate copolymer; ethylene-acrylic acid copolymer; ionomer; polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate, polylactic acid, etc.
- PE polyethylene
- PP polypropylene
- EVA ethylene -Vinyl acetate copolymer
- EVA ethylene-ethyl acrylate copolymer
- PET polyethylene terephthalate
- PBT polybutylene terephthalate
- Polyesters synthetic fibers composed solely of a thermoplastic resin such as polyamide such as nylon, or composite sheaths such as a core-sheath type, a side-by-side type, and a sea-island type composed of a plurality of the thermoplastic resins Is mentioned.
- the core-sheath type composite fiber preferably has a core-sheath structure in which the core is polyethylene terephthalate (PET) and the sheath is polyethylene such as high density polyethylene (HDPE) or low melting point polypropylene.
- these fibers is not particularly limited, and hollow fibers; irregular cross-sectional fibers such as flat, Y-type, and C-type; three-dimensional crimp fibers of latent crimp type or actual crimp type;
- segmentation fiber etc. which are divided
- These fibers may be hydrophilic fibers or hydrophobic fibers. However, when the hydrophobic fibers are used, a hydrophilic treatment with a hydrophilic treatment agent or the like is separately required.
- the above-mentioned fiber may be used individually, respectively, you may use it combining 2 or more types arbitrarily.
- the basis weight of the nonwoven fabric constituting the surface sheet is not particularly limited, but is preferably 10 g / m 2 to 100 g / m 2 , more preferably 15 g / m 2 to 50 g / m 2 .
- the basis weight is less than 10 g / m 2 , the surface strength is not sufficiently obtained, and there is a risk of tearing during use of the absorbent article, and when it exceeds 100 g / m 2 , excessive stiffness occurs. The wearer will feel uncomfortable or uncomfortable during use.
- the basis weight exceeds 50 g / m 2 , body fluid such as urine and menstrual blood is retained on the top sheet, and the solid state is maintained. Subsequently, the wearer feels uncomfortable.
- the nonwoven fabric constituting the top sheet is a nonwoven fabric produced by any production method well known in the art, such as an air-through nonwoven fabric, a spunlace nonwoven fabric, a spunbond nonwoven fabric, a thermal bond nonwoven fabric, a melt blown nonwoven fabric, or a needle punch nonwoven fabric.
- any production method well known in the art such as an air-through nonwoven fabric, a spunlace nonwoven fabric, a spunbond nonwoven fabric, a thermal bond nonwoven fabric, a melt blown nonwoven fabric, or a needle punch nonwoven fabric.
- FIG. 5 is a schematic diagram showing an example of a production facility 9 for producing an uneven nonwoven fabric used as a surface sheet of an absorbent article according to the present invention.
- the manufacturing equipment 9 includes a card machine 91 that opens the fiber F1 and adjusts the basis weight, and a suction drum 92 and an air jet nozzle 94 that form a concavo-convex shape on the fiber base material F2 exiting the card machine 91.
- a heat treatment machine 95 for heat-treating the concavo-convex fiber base material F3 formed with the concavo-convex shape by the suction drum 92 and the air jet nozzle 94 in order to fix the concavo-convex shape.
- FIG. 1 is a schematic diagram showing an example of a production facility 9 for producing an uneven nonwoven fabric used as a surface sheet of an absorbent article according to the present invention.
- the manufacturing equipment 9 includes a card machine 91 that opens the fiber F1 and adjusts the basis weight, and a suction drum 92 and
- the surface sheet 2 which consists of the fiber F1, the fiber base material F2, the uneven
- the opened fiber F ⁇ b> 1 is supplied to the card machine 91.
- the supplied fiber F1 is further opened, and the basis weight of the fiber F1 is adjusted to a desired value.
- the fiber base material F2 exiting the card machine 91 is then conveyed toward the surface of the suction drum 92.
- the suction drum is preferably formed in a hollow shape or a porous shape, and can be brought into a negative pressure state by any suction means such as a blower or a vacuum pump.
- One or a plurality of suction holes are formed on the outer peripheral surface of the suction drum, and outside air in the vicinity of the outer peripheral surface can be sucked through the suction holes.
- the size of the suction hole is not particularly limited, but it is preferable to make the size so as not to suck the fiber base material F2 into the suction drum while ensuring a predetermined suction force.
- the outer peripheral surface of the suction drum 92 is covered with a pattern plate 93 at least partially, preferably the entire periphery.
- the fiber base material F2 exiting the carding machine 91 is supplied onto the pattern plate 93 that rotates together with the suction drum 92.
- the pattern plate 93 is a punching metal or the like in which a plurality of through holes having a shape complementary to the first convex portion 21 of the surface sheet 2 are provided in a predetermined pattern.
- the fiber base material F2 supplied on the pattern plate 93 is sucked by the negative pressure from the suction hole formed in the outer peripheral surface of the suction drum 92, and the pattern plate 93 and It is attracted into the through hole.
- the distance in the vertical direction that is, the thickness direction
- the top portion 21T of the first convex portion 21 and the top portion 22T of the second convex portion 22 is substantially equal to the thickness of the pattern plate 93.
- the suction drum 92 is at least a point SS on the outer peripheral surface to which the fiber base material F2 is supplied from the upstream belt conveyor UB, and a point SE on the outer peripheral surface to supply the uneven fiber base material F3 to the downstream belt conveyor DB. It is comprised so that it may attract
- the area AN other than the area AS to be sucked in this way is preferably configured so as not to be sucked from the viewpoints of the suction efficiency of the suction drum 92 and the prevention of foreign matters.
- the gas substrate F2 adsorbed by the pattern plate 93 on the outer peripheral surface of the suction drum 92 is sprayed with a gas such as warm air by gas injection means such as an air jet nozzle 94.
- the air jet nozzle 94 is configured to blow warm air at a predetermined temperature at a predetermined wind speed from one or a plurality of outlets arranged in the width direction of the fiber base material F2.
- the warm air is substantially uniform over the entire width of the fiber base material F2. Or it can spray locally on a part of the width direction of the said fiber base material F2.
- the temperature of the hot air blown out from the air jet nozzle is not particularly limited, but from the viewpoint of formability and the like, a temperature higher than the melting point of the material constituting the fiber base material F2, for example, 20 ° C. to the melting point. It is preferable to set the temperature 70 ° C higher. If the temperature of the warm air becomes too high, the shaped nonwoven fabric will be harder than necessary, so it is preferable to adjust the temperature so that it does not become too high.
- the wind speed of the said warm air should just be a wind speed which can shape the said fiber base material F2 in desired uneven
- the wind speed is in the range of 10.0 m / sec to 150.0 m / sec, preferably 15.0 m / sec to 100.0 m / sec. sec.
- the temperature and wind speed of the hot air depend on the material and basis weight of the fiber used, the shape of the irregularities to be shaped, the conveying speed, the number and position of the air jet nozzles, etc. It is preferable to determine. As described above, by blowing hot air having a temperature higher than the melting point of the material constituting the fiber base material F2 to the fiber base material F2 at a predetermined wind speed, a desired uneven shape can be accurately obtained.
- the material F2 can be shaped.
- the surface that contacts the pattern plate 93 on the outer peripheral surface of the suction drum 92 is the surface on the skin surface side of the absorbent article. It is not limited to such a form, It is good also considering the surface by which the said warm air is sprayed as the surface by the side of the skin of the said absorbent article.
- the portion corresponding to the top portion 21T of the first convex portion 21 of the top sheet 2 is formed by the suction action by the suction drum 92 and the blowing action by the air jet nozzle 94.
- the fibers constituting the material F2 are attracted to the suction drum 92 side, and the fibers are unevenly distributed in the thickness direction of the fiber base material F2. Due to the uneven distribution of the fibers, the uneven nonwoven fabric has a fiber density on the suction drum 92 side, that is, on the skin surface side of the absorbent article, at the top portion 21T of the first convex portion 21, and the air jet nozzle 94 side. That is, it is higher than the fiber density on the clothing side of the absorbent article.
- the portion of the fiber base material F2 corresponding to the top portion 22T of the second convex portion 22 is also a fiber constituting the fiber base material F2 by the suction action by the suction drum 92 and the spray action by the air jet nozzle 94. Is attracted to the suction drum 92 side, and the fibers are unevenly distributed in the thickness direction of the fiber base material F2, so that the uneven nonwoven fabric has the top portion 22T of the second convex portion 22 at the suction drum 92 side, That is, the fiber density on the skin surface side of the absorbent article is higher than the fiber density on the air jet nozzle 94 side, that is, the clothing side of the absorbent article.
- the “fiber density” as used herein refers to the number of cut cross sections of the fiber per fixed area when the cut surface of the nonwoven fabric is magnified, specifically, scanning the cut surface of the nonwoven fabric.
- a scanning electron microscope for example, “Real Surface View Microscope VE-7800” manufactured by KEYENCE, Inc.
- the number of cut cross-sections of fibers per fixed area about 2 mm 2
- the fiber density is measured at three locations, and the average value is used as the fiber density of the sample.
- the "fiber density on the skin side” refers to the fiber density of the part on the skin side when the thickness of the nonwoven fabric is divided into two equal parts, and the “fiber density on the clothing side” The fiber density of the remaining clothing side portion at this time is indicated.
- FIG. 6 is an electron micrograph of the cut surface of the top portion 21T of the first convex portion 21 of the uneven nonwoven fabric. According to this photograph, as described above, it can be seen that the fiber density on the skin surface side SD is higher than the fiber density on the clothing side GD at the top of the convex portion.
- FIG. 7 schematically shows the fiber density state before and after joining of the uneven nonwoven fabric
- FIG. 8 shows an electron microscope at the cut surface of the top portion 22T of the second convex portion 22 after joining. It is a photograph.
- High fiber density portion HD that is, when the fiber density on the clothing side is lower than the fiber density on the skin side (see the low fiber density portion LD on the clothing side in FIG.
- the low density part LD on the clothing side of the top part 22T of the said 2nd convex part 22 is crushed and compression-joined, and the top part 22T of the said 2nd convex part 22 after joining.
- the fiber density of the top portion 22T of the second convex portion 22 is higher than the fiber density around the top portion 22T (the further high density portion MHD in FIG. 7). From the periphery of the top portion 22T of the second convex portion 22). Toward the junction of the top 22T, it is possible to easily draw body fluid more urine and menstrual blood.
- the relationship of the fiber density of each part is LD ⁇ HD ⁇ MHD.
- each convex part of the uneven nonwoven fabric includes the shape of the through hole of the pattern plate, the suction force of the suction drum, the temperature and wind speed of the hot air blown from the air jet, the basis weight of the fiber base material F2, Since it depends on the material of the fibers constituting the fiber base material F2, the shape of the convex portion can be arbitrarily adjusted by appropriately setting these factors.
- the uneven fiber base material F3 having an uneven shape formed by the suction drum 92 and the air jet nozzle 94 is then conveyed to a heat treatment machine 95 by a conveying device such as a belt conveyor DB.
- a conveying device such as a belt conveyor DB.
- heat treatment is performed.
- the uneven shape formed on the uneven fiber base material F3 is fixed and flexibility is imparted to the uneven nonwoven fabric.
- the uneven nonwoven fabric used as the top sheet 2 of the absorbent article according to the present invention is completed.
- the completed uneven nonwoven fabric may be cut into a desired size according to the form to be used.
- the absorbent element used in the absorbent article of the present invention is not particularly limited as long as it has a function of absorbing and retaining body fluids such as urine and menstrual blood, and any absorbent element conventionally employed However, from the viewpoint of comfort at the time of wearing, etc., those which are bulky, do not easily lose shape and have little chemical stimulation are preferable.
- absorbent elements include fiber materials such as fluffy pulp, spunbonded nonwoven fabric, airlaid nonwoven fabric, and thermoplastic fibers, and polymer absorbents such as super absorbent polymers (SAP).
- the absorbent core is at least partially covered with an absorbent core covering sheet made of a liquid permeable sheet such as a tissue sheet, a liquid permeable nonwoven fabric, or a hydrophilic nonwoven fabric.
- the said absorption core does not need to contain the superabsorbent polymer, For example, what covered only the above-mentioned fiber material with the tissue can also be used as the said absorption core.
- cellulose fibers such as chemical pulp, cellulose fibers, rayon and acetate
- fiber network absorbers using synthetic fibers such as polyolefins, polyesters and polyamides
- a foam absorbent body using a foam material such as polyurethane can also be used as the fiber material of the absorbent core.
- the basis weight of the fiber material is not particularly limited, but is, for example, 50 g / m 2 to 1000 g / m 2 , preferably 100 g / m 2 to 800 g / m 2 from the viewpoint of absorbability of body fluids such as urine and menstrual blood. m 2 , more preferably 150 g / m 2 to 700 g / m 2 .
- the superabsorbent polymer used in the absorbent core has a three-dimensional network structure in which water-soluble polymers are appropriately cross-linked, and is essentially water-insoluble. Furthermore, the superabsorbent polymer can absorb 20 times or more of its own weight, preferably 30 to 60 times, more preferably several hundred to 1,000 times, and the water once absorbed is subjected to some stress. Those that do not exude even when applied are preferred. Examples of such superabsorbent polymers include starch polymers, crosslinked carboxylmethylated cellulose, acrylic acid polymers such as polymers or copolymers of acrylic acid and alkali metal acrylates, and amino acid polymers. It is done.
- the form of the superabsorbent polymer is not particularly limited, and examples thereof include a particulate form, a powdery form, a massive form, a secondary aggregate form of particles, and a fibrous form.
- it is in the form of particles, powders or fibers, more preferably particles having a particle size of 1 to 1000 ⁇ m, more preferably particles having a particle size of 10 to 500 ⁇ m.
- the basis weight of the superabsorbent polymer is not particularly limited, but is, for example, 50 g / m 2 to 1000 g / m 2 , and preferably 80 g / m 2 to 80 g / m 2 from the viewpoint of absorbability of body fluids such as urine and menstrual blood. 800 g / m 2 , more preferably 100 g / m 2 to 700 g / m 2 .
- the mass ratio of the superabsorbent polymer is, for example, 10% to 100%, preferably 20% to 80%, more preferably 10% to 100%, in terms of the absorbability of body fluids such as urine and menstrual blood. Preferably, it is within the range of 30 to 65%.
- the absorbent core covering sheet that at least partially covers the absorbent core is made of a liquid permeable sheet such as an air-through nonwoven fabric, a spunbond nonwoven fabric, a point bond nonwoven fabric, a hydrophilic treated apertured plastic film, or a liquid permeable plastic film. Composed.
- the liquid permeable sheet when the liquid permeable sheet is provided between the top sheet and the absorbent core, the liquid permeable sheet preferably has a fiber density higher than that of the top sheet. When such a liquid permeable sheet is provided between the top sheet and the absorbent core, the liquid brushing property can be improved and the liquid return can be reduced.
- the fiber density of the liquid permeable sheet is higher than the fiber density at the top of the second convex portion of the top sheet (that is, the fiber density at the top of the second convex portion is the fiber of the liquid permeable sheet.
- the fiber density at the top of the second convex portion is the fiber of the liquid permeable sheet.
- the fineness of the fibers constituting the liquid permeable sheet is preferably 0.01 to 20 dtex, more preferably 1 to 10 dtex. If the fineness is too large, the number of fibers decreases, so that it is difficult to hold the polymer absorbent between the fibers, and the swelling of the polymer absorbent is likely to be inhibited (that is, the amount of absorption decreases). To do). On the other hand, if the fineness is too small, the rigidity of the fiber itself becomes low, and it becomes difficult to maintain the basic structure of the liquid-permeable sheet made of the fiber. Further, the fiber length of the fibers constituting the liquid permeable sheet is preferably 30 mm to 80 mm, more preferably 40 mm to 70 mm.
- the fiber length is too long, it becomes difficult to handle the fiber, and conversely, if the fiber length is too short, the number of heat-sealed portions is reduced, so the basic structure of the liquid-permeable sheet made of the fiber is maintained. It becomes difficult to do.
- the basis weight of the liquid-permeable sheet is not particularly limited, but it is, for example, 5 g / m 2 to 50 g / m 2 , preferably 5 g / m 2 to 30 g / m 2 in terms of liquid brushing property, strength, liquid return, and the like.
- m 2 more preferably 8 g / m 2 to 25 g / m 2 .
- the liquid permeable sheet may cover the absorbent core with one sheet, but it is preferable to cover the absorbent core with two sheets. In addition, as long as the said absorption core does not lose shape, it is not necessary to cover the said absorption core with the said liquid-permeable sheet.
- the absorbent core covering sheet may be composed of two or more liquid permeable sheets in at least a region located between the top sheet and the absorbent core.
- the two or more liquid-permeable sheets are arranged so that the fiber density sequentially decreases from the liquid-permeable sheet on the skin side toward the liquid-permeable sheet on the clothing side.
- the shape, structure, size, etc. of the absorbent element can be appropriately changed as long as the amount of absorption required as an absorbent article and the comfort at the time of wearing are satisfied.
- the method for joining the topsheet and the absorbing element is not particularly limited as long as it can be surface-joined so that the shape of the joining portion is planar, and conventionally used thermal embossing, ultrasonic embossing, and high-frequency embossing are used.
- Any bonding method can be employed, such as mechanical fusion using an adhesive such as hot melt adhesive; mechanical bonding using engagement, etc. From the viewpoint of manufacturing equipment, ease of handling, etc., heat fusion by hot embossing or adhesion by an adhesive such as a hot melt adhesive is preferred.
- a joining means By using such a joining means, the structure of the joint having excellent liquid transferability can be realized more reliably and more easily.
- a conventionally used joining means such as embossing or adhesive, it is possible to avoid complication of manufacturing equipment and construction of new manufacturing equipment.
- the topsheet and the absorbent element can be partially joined by introducing the topsheet and the absorbent element in an overlapped state and sandwiching the topsheet and the absorbent element.
- the heating temperature of the embossing roll is not particularly limited, but a temperature at which a material facing at least one joining surface of the topsheet and the absorbing element is at least partially melted is preferable.
- a heating temperature is, for example, in the range of 50 ° C. to 300 ° C., preferably 60 ° C. to 200 ° C., more preferably, from the viewpoint of liquid transferability, bonding strength, texture, etc. in the bonded portion after bonding. It is within the range of 70 ° C to 150 ° C, particularly preferably 80 ° C to 130 ° C.
- the linear pressure between the two rolls is not particularly limited, and as described above, the pressure at which the low fiber density portion LD at the top of the second convex portion of the concave and convex nonwoven fabric constituting the top sheet is crushed and can be surface joined. It is preferable to set so that Such a linear pressure is, for example, in the range of 1 N / cm to 1000 N / cm, preferably 10 N / cm to 800 N / cm, from the viewpoint of liquid transferability, bonding strength, texture, and the like at the joint. Preferably, it is in the range of 30 N / cm to 600 N / cm, particularly preferably 50 N / cm to 400 N / cm.
- the form of the joint part in plan view is not particularly limited, but for example, circular, elliptical, rectangular, rectangular, rhombus, polygonal, etc. in plan view There are various forms.
- the pattern in which the joints are arranged is not particularly limited, but from the viewpoint of bulkiness and texture after joining, strength, liquid transferability of the joints, and the like, it is a staggered arrangement, for example, 1 mm to 30 mm, preferably 3 mm to They are arranged at a pitch of 10 mm, more preferably 4 mm to 7 mm.
- an adhesive such as a hot melt adhesive is supplied in a predetermined pattern on the clothing side of the topsheet and / or the skin surface side of the absorbent element using any means such as coating. Thereafter, the top sheet and the absorbent element can be partially bonded together by overlapping them under pressure or non-pressure.
- the adhesive is not particularly limited, and any conventionally used adhesive can be employed, but from the viewpoint of liquid transferability, bonding strength, texture, productivity, availability, etc.
- a hot melt adhesive is preferred.
- Such hot melt adhesives are not particularly limited, but examples thereof include olefins such as polyethylene, polypropylene, and ethylene- ⁇ -olefin copolymers; ethylene-vinyl acetate copolymer systems; polyamide systems; styrene-butylene-styrene.
- examples thereof include thermoplastic elastomers such as copolymers and styrene-isoprene-styrene copolymers; reactive hot melts such as moisture-curable urethane prepolymers.
- the predetermined pattern to which the adhesive is applied is not particularly limited, and examples thereof include ⁇ coating, spiral coating, coater coating, and the like, and circular, elliptical, rectangular, rectangular, rhombus in plan view
- dot patterns having various shapes such as polygons can be used.
- the pattern has a lattice arrangement, for example, from 1 mm to 30 mm, preferably from 3 mm to 10 mm, and more preferably from 4 mm to 7 mm, from the viewpoint of bulkiness, texture, strength, and liquid transferability at the joint. Applied.
- the joining of the topsheet and the absorbent element can be carried out by any joining method as well as the above-described method, but in the present invention, the joint at the top of the second convex portion of the topsheet is a surface. It is indispensable that they are joined to form a shape, that is, “surface joined”.
- the term “surface bonding” as used herein means that at least a part of the top portion of the second convex portion, particularly the vertex portion, of the surface sheet constitutes the absorbent element, particularly the absorbent core covering sheet. It is a joining form that is in a state of entering between fibers, and a joining area ratio described later is 4.0% or more.
- the term “bonded area ratio” refers to the area ratio of the bonded portion per unit area of the overlapping region where the topsheet and the absorbent element overlap in plan view. Such a bonding area ratio can be measured by a measuring method using a scanning electron microscope described later. By setting the bonding area ratio to 4.0% or more, preferably 5.0% or more, and particularly preferably 5.2% or more, liquid transferability and the like can be further improved.
- the bonding area ratio is preferably 60% or less, more preferably 40% or less, and particularly preferably 20% or less, from the viewpoint of bulkiness or texture.
- the absorbent article of the present invention it is preferable to use an uneven nonwoven fabric in which the fiber density on the skin surface side at the top of the first or second convex portion is higher than the fiber density on the clothing side as the top sheet.
- an uneven nonwoven fabric as shown in FIGS. 7 and 8
- the fiber density on the clothing side is higher than the fiber density on the skin surface side at the top portion 22 ⁇ / b> T of the second convex portion 22 of the topsheet 2. Therefore, when the topsheet 2 and the absorbent element 4 are joined, the low fiber density portion LD in the top portion 22T is crushed and compression joined, and the top portion 22T of the second convex portion 22 after joining is compressed.
- the top portion 22T extends from the periphery of the top portion 22T of the second convex portion 22.
- the body fluid such as urine and menstrual blood can be drawn more easily through the joint.
- the topsheet and the absorbent element are bonded so that the bonding area ratio is higher than the bonding area ratio of the bonding portion in the central region.
- the joint area ratio of the left and right regions in the width direction is made higher than that in the central region, it is possible to more effectively prevent body fluid such as urine and menstrual blood from flowing out from the end in the width direction of the absorption element. Since the entrance of body fluid in the central region is lower than that in the left and right regions, the body fluid can be spread and absorbed in a wider range, and the use efficiency of the absorption element can be significantly improved.
- the topsheet is formed on the absorbent element so as not to cover side edges on both sides extending in the longitudinal direction of the absorbent article (that is, the wearer's longitudinal direction). It is preferable that it is joined.
- the surface sheet ensures excellent liquid transferability, and does not give the wearer a sense of incongruity in the portion that is in sliding contact with the circumference of the wearer's thigh or the like. can do.
- the present invention can be applied to various absorbent articles such as incontinence pads, sanitary napkins, panty liners and the like in addition to the disposable diaper of the above-described embodiment.
- various absorbent articles such as incontinence pads, sanitary napkins, panty liners and the like in addition to the disposable diaper of the above-described embodiment.
- excellent cushioning, good return when pressed, excellent excretion collection, and excellent liquid transfer from the topsheet to the absorbent element especially for large amounts of liquid Absorbable articles such as disposable diapers, incontinence pads and sanitary napkins can be preferably used.
- the absorbent article of the present invention is not limited to the above-described embodiment and the following examples, and can be appropriately changed without departing from the object and spirit of the present invention.
- nonwoven fabric on the absorbent element side the laminated body sample which joined the said uneven
- the formed card web (fiber base material F2) is transported by a mesh conveyor, is attached to the outer peripheral surface of the suction drum, is supplied onto a pattern plate that rotates together with the suction drum, and the suction drum is rotated while the suction drum is rotated.
- the card web is sucked by a negative pressure from a suction hole formed on the outer peripheral surface of the drum, and hot air of 140 ° C. is blown from an air jet nozzle disposed at a predetermined position below the suction drum at a wind speed of 33.3 m.
- the card web was blown onto the card web at / sec, and the card web was made to follow the pattern plate, thereby forming a predetermined pattern of irregularities on the card web.
- the web (uneven fiber base material F3) formed with the concavo-convex shape is conveyed to a heat treatment machine and subjected to heat treatment under hot air conditions at a temperature of 133 ° C. and a wind speed of 0.9 m / sec.
- An uneven nonwoven fabric was obtained by winding.
- the basic weight of the obtained uneven nonwoven fabric was 30 g / m ⁇ 2 >.
- the bonding state was confirmed by a scanning electron microscope, and further, the bonding range (a1), the bonding area ratio (a2), the penetration rate and the brushing rate were measured, The absorption behavior of the laminate samples was compared.
- the photographing conditions of the joint by a scanning electron microscope, the measurement conditions of the joint range (a1), the joint area ratio (a2), and the like are as follows.
- the bonding range (a1) is a magnification (20 ⁇ to 20 °) at which the entire bonded portion can be observed with a scanning electron microscope at the cut surface of the bonded portion between the uneven nonwoven fabric and the nonwoven fabric on the absorbent element side. (100 times magnification) was observed and photographed, and was determined by the scale of the photographed photograph.
- the bonding area ratio (a2) is measured as described above because the tip of each protrusion of the emboss has a slightly rounded shape.
- One bonding area was calculated using the bonded range (a1) as a diameter, and this was applied to a predetermined emboss pattern to calculate the bonding area ratio (a2).
- the bonding area ratio (a2) may not be an emboss pattern, and the shape of the protrusion may be circular, elliptical, rectangular, or the like.
- the simulated urine was prepared by dissolving 200 g of urea, 80 g of sodium chloride, 8 g of magnesium sulfate, 3 g of calcium chloride, and about 1 g of a dye (blue No. 1) in 10 L of ion-exchanged water.
- the fiber density was measured in the same manner as the method described in JP2012-144835A (see paragraph [0041]). Specifically, using a scanning electron microscope (for example, “Real Surface View Microscope VE-7800” manufactured by KEYENCE), the cross section of the nonwoven fabric is magnified with the midpoint in the thickness direction of the nonwoven fabric as the center of observation. (Ie, when the magnification is such that about 20 to 70 fiber cross sections can be observed, and usually observed at a magnification of 20 to 100 times), the number of cut cross sections of the fibers per fixed area (about 2 mm 2 ). The number of cut sections was converted to the number of cut sections of fibers per 1 mm 2 , and this was used as the fiber density. In addition, the measurement of this fiber density was performed in three places, and the average value was made into the fiber density of a sample.
- a scanning electron microscope for example, “Real Surface View Microscope VE-7800” manufactured by KEYENCE
- Example 1 The uneven nonwoven fabric produced as described above and the absorbent element side nonwoven fabric coated with HMA spirally were superposed and bonded together to integrate them.
- the joining state of the obtained laminate sample was confirmed by a scanning electron microscope, and the joining range (a1), joining area ratio (a2), penetration rate, and brushing rate were measured.
- FIG. 9 shows an electron micrograph of the laminate sample of Example 1, and Table 1 shows the measurement results such as the bonding range (a1).
- Example 2 An embossing method using an embossing roll provided with a plurality of pins arranged in a staggered pattern with a MD direction pitch of 6.9 mm and a CD direction pitch of 4 mm as a joining means, and heated to 110 ° C.
- a laminated body sample was produced in the same manner as in Example 1 except that was adopted.
- the joining state of the obtained laminate sample was confirmed by a scanning electron microscope, and the joining range (a1), joining area ratio (a2), penetration rate, and brushing rate were measured.
- FIG. 10 shows an electron micrograph of the laminate sample of Example 2, and Table 1 shows the measurement results of the joining range (a1) and the like.
- Comparative Example 1 A laminate sample of Comparative Example 1 was prepared in the same manner as Example 1 except that a flat nonwoven fabric having no uneven shape was used instead of the uneven nonwoven fabric.
- the basis weight of the obtained flat nonwoven fabric was 30 g / m 2 .
- Comparative Examples 2-6 Laminate samples of Comparative Examples 2 to 6 having different bonding areas were prepared in the same manner as in Example 1 or 2 except that the bonding state was point bonding (that is, the bonding area was less than 4.0%). .
- the joining state of each obtained laminate sample was confirmed by a scanning electron microscope, and the joining range (a1), joining area ratio (a2), penetration rate and brushing rate were measured.
- Table 1 shows the measurement results such as the bonding range (a1) of the laminate samples of Comparative Examples 2 to 6.
- each of the laminate samples of Examples 1 and 2 joined by surface joining was compared with each of the laminate samples of Comparative Examples 2 to 6 joined by point joining, and the penetration rate and the brushing rate. was found to be significantly improved.
- each of the laminate samples of Examples 1 and 2 has an improved permeation rate and brush rate than the laminate sample of Comparative Example 1 having a joining area ratio of 100% (that is, full-surface joining). I found out. This is because the fiber density of the top part of the second convex part in the uneven nonwoven fabric after joining is configured to be higher than the fiber density around the top part, so that more liquid flows from the periphery of the top part to the joint part of the top part. It supports that it is easy to pull in.
- the embossing roll pins from the surface sheet were joined by the embossing method as in the laminate sample of Example 2. Since the fibers were compressed so as to push the fibers toward the absorbent element-side nonwoven fabric, it was found that excellent absorption characteristics were exhibited even at a relatively low bonding area ratio.
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Abstract
Description
凹凸不織布の作製に当たっては、まず、1.3dtexの繊度を有し、芯/鞘=PET/HDPEの芯鞘構造を有する複合繊維(繊維F1)を開繊機にて開繊した後、所定の坪量となるように設定したカード機にて前記繊維のフォーミングを行った。フォーミングされたカードウェブ(繊維基材F2)をメッシュコンベアにより搬送し、サクションドラムの外周面に取り付けられ、該サクションドラムと共に回転するパターンプレート上に供給し、前記サクションドラムを回転させながら、前記サクションドラムの外周面に形成された吸引孔からの負圧によって前記カードウェブを吸引すると共に、該サクションドラム下側の所定位置に配置されたエアジェットノズルから、140℃の温風を風速33.3m/secで前記カードウェブに吹き付けて、前記カードウェブを前記パターンプレートに沿わせることにより、前記カードウェブに所定パターンの凹凸形状を賦形した。さらに、前記凹凸形状が賦形されたウェブ(凹凸繊維基材F3)を熱処理機に搬送して、温度133℃、風速0.9m/secの温風条件下で熱処理を行った後、それを巻き取ることにより凹凸不織布を得た。なお、得られた凹凸不織布の坪量は30g/m2であった。
吸収要素側の不織布としては、2.2dtexの繊度を有し、芯/鞘=PET/HDPEの芯鞘構造を有する複合繊維を用いて作製された、坪量が20g/m2の不織布を使用した。そして、上記にて作製した凹凸不織布と、前記吸収要素側の不織布とを、後述する各実施例又は比較例の条件にて、熱エンボス又はホットメルト接着剤(HMA)により接合し、実施例1及び2並びに比較例1~6の各積層体サンプルを作製した。
接合範囲(a1)は、凹凸不織布と吸収要素側の不織布との接合部の切断面を、走査電子顕微鏡により接合部全体が観察できる程度の倍率(20倍~100倍)で拡大観察して撮影し、撮影した写真のスケールにより決定した。
接合面積率(a2)は、接合手段がエンボスの場合は、エンボスの各突起部の先端が僅かに丸みを帯びた形状であるため、上記のように測定した接合範囲(a1)を直径として1つの接合面積を算出し、それを所定のエンボスパターンに適用して接合面積率(a2)を算出した。なお、この接合面積率(a2)はエンボスパターンによるものではなくてもよく、前記突起部の形状も、円形、楕円形、長方形等であってもよい。また、接合手段がHMAの場合も、前記凹凸不織布の前記凸部の先端形状が僅かに丸みを帯びた形状であるため、上記のように測定した接合範囲(a1)を直径として1つの接合面積を算出し、それを所定の凹凸パターンに適用して接合面積(a2)を算出した。
浸透速度及びハケ速度の測定に当たっては、まず、ユニ・チャーム株式会社から市販されているベビー用紙オムツ、ムーニー「エアフィット」Sサイズから表面材を取り除き、この表面材を取り除いた部分に上記のようにして作製した積層体サンプルを貼り合わせることにより、吸収性評価試験用サンプルを作製した。この吸収性評価試験用サンプルを用いて、以下の吸収性評価試験を行った。吸収性評価試験に当たっては、40mlの模擬尿を1回滴下し、この模擬尿がすべて前記凹凸不織布内に移行した時間を計測し、この計測された時間を浸透速度とした。同様に、前記模擬尿が凹凸不織布を通過して、すべて吸収要素側の不織布に移行した時間を計測し、この計測された時間をハケ速度とした。なお、上記模擬尿は、イオン交換水10Lに、尿素200g、塩化ナトリウム80g硫酸マグネシウム8g、塩化カルシウム3g及び色素(青色1号)約1gを溶解させることにより調製した。
繊維密度の測定に当たっては、特開2012-144835号公報に記載されている方法(段落[0041]参照)と同様にして行った。具体的には、走査型電子顕微鏡(例えば、KEYENCE社製「リアルサーフェスビュー顕微鏡 VE-7800」)を用いて、不織布の切断面を、該不織布の厚み方向における中点を観察の中心として拡大観察したとき(すなわち、繊維断面が20~70本程度観察できる程度の倍率であって、通常、20~100倍の倍率で観察したとき)の一定面積(2mm2程度)当たりの繊維の切断断面数を数え、該切断断面数を1mm2当たりの繊維の切断断面数に換算し、これを繊維密度とした。なお、この繊維密度の測定は3箇所で行い、その平均値をサンプルの繊維密度とした。
上記のようにして作製した凹凸不織布と、HMAをスパイラル塗工した吸収要素側の不織布とを重ね合わせて接着し、両者を一体化した。得られた積層体サンプルの接合状態を走査型電子顕微鏡により確認し、さらに、接合範囲(a1)、接合面積率(a2)、浸透速度及びハケ速度を測定した。実施例1の積層体サンプルの電子顕微鏡写真を図9に示し、接合範囲(a1)等の測定結果を表1に示す。
接合手段として、HMAによる接着法の代わりに、MD方向ピッチ6.9mm、CD方向ピッチ4mmで千鳥状パターンに配置された複数のピンを備え、110℃に加熱されたエンボスロールを用いたエンボス法を採用したこと以外は、実施例1と同様にして積層体サンプルを作製した。得られた積層体サンプルの接合状態を走査型電子顕微鏡により確認し、さらに、接合範囲(a1)、接合面積率(a2)、浸透速度及びハケ速度を測定した。実施例2の積層体サンプルの電子顕微鏡写真を図10に示し、接合範囲(a1)等の測定結果を表1に示す。
凹凸不織布の代わりに、凹凸形状を有していない平坦な不織布を用いたこと以外は、実施例1と同様にして比較例1の積層体サンプルを作製した。前記平坦な不織布の作製に当たっては、まず、1.3dtexの繊度を有し、芯/鞘=PET/HDPEの芯鞘構造を有する合成繊維を開繊機にて開繊し、所定の坪量となるように設定したカード機にてフォーミングを行った。さらに、フォーミングされたカードウェブをメッシュコンベアにて所定温度に設定された熱処理機に搬送し、温度133℃、風速0.9m/secの温風条件下で熱処理を行った後、それを巻き取ることにより、前記平坦な不織布を作製した。なお、得られた平坦な不織布の坪量は30g/m2であった。
接合状態を点接合(すなわち、接合面積が4.0%未満)にしたこと以外は、実施例1又は2と同様にして、接合面積がそれぞれ異なる比較例2~6の積層体サンプルを作製した。得られた各積層体サンプルの接合状態を走査型電子顕微鏡により確認し、さらに、接合範囲(a1)、接合面積率(a2)、浸透速度及びハケ速度を測定した。比較例2~6の積層体サンプルの接合範囲(a1)等の測定結果を表1に示す。
2 表面シート
21 第一凸部
21T 第一凸部の頂部
22 第二凸部
22T 第二凸部の頂部
3 バックシート
4 吸収要素
9 製造設備
91 カード機
92 サクションドラム
93 パターンプレート
94 エアジェットノズル
95 熱処理機
F1 繊維
F2 繊維基材
F3 凹凸繊維基材
Claims (9)
- 吸収性物品の肌面側に用いられる凹凸構造を有する表面シートであって、肌面側に突出する第一凸部及び前記肌面側とは反対の着衣側に突出する第二凸部を有する前記表面シートと、
平面視にて前記表面シートと重なる位置に配置される吸収要素と、
を有する吸収性物品であって、
前記表面シートと前記吸収要素とが、前記第二凸部の頂部の接合部において面状の形態で接合されている、吸収性物品。 - 前記面状の形態の接合部が、エンボス又は接着剤を用いた面接合によって形成されたものである、請求項1に記載の吸収性物品。
- 前記接着剤がホットメルト接着剤である、請求項2に記載の吸収性物品。
- 前記表面シートが不織布からなり、前記接合部における前記第二凸部の頂部の繊維密度が、該頂部周囲の繊維密度よりも高い、請求項1~3のいずれか一項に記載の吸収性物品。
- 平面視にて前記表面シートと前記吸収要素とが重なる重複領域を、前記吸収性物品の幅方向において3等分した場合に、前記幅方向における左右領域の前記接合部の接合面積率が、中央領域の前記接合部の接合面積率よりも高い、請求項1~4のいずれか一項に記載の吸収性物品。
- 前記第一凸部又は前記第二凸部は、円柱状、楕円柱状、多角柱状、円錐状、角錐状、円錐台状及び角錐台状からなる群から選択される少なくとも1つの形状を有する、請求項1~5のいずれか一項に記載の吸収性物品。
- 前記表面シートが不織布からなり、前記吸収要素が、吸収コアと、該吸収コアを肌面側から少なくとも部分的に覆う液透過性シートからなり且つ前記表面シートの第二凸部の頂部と接合される吸収コア被覆シートと、を含み、前記液透過性シートの繊維密度が、前記第二凸部の頂部における繊維密度よりも高い、請求項1~6のいずれか一項に記載の吸収性物品。
- 前記吸収要素が、吸収コアと、該吸収コアを少なくとも部分的に覆う液透過性シートからなり且つ前記表面シートの第二凸部の頂部と接合される吸収コア被覆シートと、を含み、前記吸収コア被覆シートは、少なくとも前記表面シートと前記吸収コアとの間に位置する領域において、2枚以上の液透過性シートによって構成されており、前記2枚以上の液透過性シートは、肌面側の液透過性シートから着衣側の液透過性シートに向かって繊維密度が順次低くなるように配置されている、請求項1~7のいずれか一項に記載の吸収性物品。
- 前記表面シートが、前記吸収要素における吸収性物品の長手方向に延びる両側の側縁部を覆わないように前記吸収要素と接合されている、請求項1~8のいずれか一項に記載の吸収性物品。
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AU2015241735A AU2015241735A1 (en) | 2014-04-04 | 2015-03-12 | Absorbent article |
BR112016022738A BR112016022738A2 (pt) | 2014-04-04 | 2015-03-12 | Artigo absorvente |
US15/301,401 US20170105888A1 (en) | 2014-04-04 | 2015-03-12 | Absorbent article |
KR1020167026702A KR102245108B1 (ko) | 2014-04-04 | 2015-03-12 | 흡수성 물품 |
EP15772907.0A EP3127519A4 (en) | 2014-04-04 | 2015-03-12 | Absorbent article |
CN201580017906.7A CN106163472A (zh) | 2014-04-04 | 2015-03-12 | 吸收性物品 |
PH12016501872A PH12016501872B1 (en) | 2014-04-04 | 2016-09-22 | Absorbent article |
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KR (1) | KR102245108B1 (ja) |
CN (1) | CN106163472A (ja) |
AU (1) | AU2015241735A1 (ja) |
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MY (1) | MY181227A (ja) |
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JP6479107B2 (ja) * | 2017-08-01 | 2019-03-06 | ユニ・チャーム株式会社 | 吸収性物品 |
JP6899359B2 (ja) | 2017-10-25 | 2021-07-07 | 花王株式会社 | 吸収性物品 |
JP7057102B2 (ja) * | 2017-11-22 | 2022-04-19 | 花王株式会社 | 吸収性物品 |
ES3002557T3 (en) * | 2019-02-13 | 2025-03-07 | Procter & Gamble | Feminine hygiene pad with hydrophilic nonwoven topsheet having enhanced skin feel and obscuring performance |
KR102144297B1 (ko) | 2019-03-19 | 2020-08-13 | 한국조선해양 주식회사 | 고입열 용접에 따른 충격인성 및 내균열성이 우수한 가스실드 아크 용접용 티타니아계 플럭스 충전 와이어 |
CN112869955A (zh) * | 2019-11-30 | 2021-06-01 | 尤尼吉可株式会社 | 卫生巾、一次性尿布等吸液性物品 |
CN111407521A (zh) * | 2020-04-13 | 2020-07-14 | 宜春希宇生物制品有限公司 | 一种防侧漏的生理可调式卫生巾 |
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JP6486013B2 (ja) | 2019-03-20 |
KR102245108B1 (ko) | 2021-04-26 |
CN106163472A (zh) | 2016-11-23 |
MY181227A (en) | 2020-12-21 |
EP3127519A1 (en) | 2017-02-08 |
EP3127519A4 (en) | 2017-03-22 |
JP2015198706A (ja) | 2015-11-12 |
AU2015241735A1 (en) | 2016-10-20 |
US20170105888A1 (en) | 2017-04-20 |
KR20160141719A (ko) | 2016-12-09 |
PH12016501872A1 (en) | 2017-01-09 |
PH12016501872B1 (en) | 2020-11-11 |
BR112016022738A2 (pt) | 2017-08-15 |
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