WO2010134456A1 - 吸収体および吸収性物品 - Google Patents
吸収体および吸収性物品 Download PDFInfo
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- WO2010134456A1 WO2010134456A1 PCT/JP2010/058044 JP2010058044W WO2010134456A1 WO 2010134456 A1 WO2010134456 A1 WO 2010134456A1 JP 2010058044 W JP2010058044 W JP 2010058044W WO 2010134456 A1 WO2010134456 A1 WO 2010134456A1
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- Prior art keywords
- absorbent
- sheet
- absorber
- liquid
- absorbent body
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- 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
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- 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
- A61F13/531—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 having a homogeneous composition through the thickness of the pad
- A61F13/532—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 having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad
- A61F13/5323—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 having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad having absorbent material located in discrete regions, e.g. pockets
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- 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
- A61F13/47—Sanitary towels, incontinence pads or napkins
- A61F13/4704—Sanitary towels, incontinence pads or napkins having preferential bending zones, e.g. fold lines or grooves
-
- 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
- A61F13/534—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 having an inhomogeneous composition through the thickness of the pad
- A61F13/537—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 having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
- A61F13/53708—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 having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer the layer having a promotional function on liquid propagation in at least one direction
- A61F13/53717—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 having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer the layer having a promotional function on liquid propagation in at least one direction the layer having a promotional function on liquid propagation in the horizontal direction
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- 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
- A61F13/15203—Properties of the article, e.g. stiffness or absorbency
- A61F2013/15284—Properties of the article, e.g. stiffness or absorbency characterized by quantifiable properties
-
- 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
- A61F2013/530481—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 having superabsorbent materials, i.e. highly absorbent polymer gel materials
- A61F2013/53051—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 having superabsorbent materials, i.e. highly absorbent polymer gel materials being only in particular parts or specially arranged
-
- 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
- A61F13/534—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 having an inhomogeneous composition through the thickness of the pad
- A61F13/537—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 having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
- A61F13/53708—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 having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer the layer having a promotional function on liquid propagation in at least one direction
- A61F2013/53721—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 having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer the layer having a promotional function on liquid propagation in at least one direction with capillary means
Definitions
- the present invention relates to an absorbent body used for absorbent articles such as sanitary napkins, disposable diapers and incontinence pants, and absorbent articles using the same.
- Absorbent articles used for sanitary napkins, disposable diapers, etc. usually absorb liquid between a liquid-permeable top sheet located on the skin side and a liquid-impermeable back sheet located on the clothes side. Has an absorbent body to hold.
- This absorber is generally rectangular in shape so as to cover the excretion point of the wearer, but an improvement in shape and structure has been proposed.
- Patent Document 1 in an unfolded diaper, an entire surface of one side of an absorbent body that covers the entire excretory region in front and back from the butt to the lower abdomen is fixed to an outer sheet, and is cut out in the middle of the absorbent body. A plurality of thin-walled portions are arranged in parallel.
- a string-like elastic member is disposed so as to be orthogonal to the parallel direction of the cut-out thin portion of the absorber, and when worn, the cut-out thin portion is deformed so that the cut-out thin portion opens and closes.
- this absorber does not consist of a plurality of independent absorbers. Since the entirety of the large absorbent body is fixed to the seat, it is not substantially different from the normal one in that respect, and it is not possible to expect a great improvement in the body compatibility and the movement followability with respect to the body movement.
- Patent Document 2 discloses an absorptive pad in which a liquid-impermeable back sheet and a liquid-permeable cover sheet are joined with a rhombus-based lattice-like (industrial lattice-like) line.
- a rhombus-based lattice-like (industrial lattice-like) line Each of the rhombus regions surrounded by the joining line is disposed in a state in which a main body portion of the absorbent material is enclosed.
- the orthogonal lattice-like joining line in which the absorbent material does not exist becomes a water channel, and the liquid can flow there.
- the main body portion of the absorbent material is fixed to the liquid-impermeable back sheet over the entire surface, and it is difficult to expect a significant improvement in body compatibility and motion tracking.
- the lattice-shaped joining line forming the water channel may be an obstacle to the liquid transfer between the liquid residue and the lattice-shaped region, depending on the application and the state of excre
- a plurality of rectangular flat-plate-shaped absorbers are arranged in parallel on the stretchable sheet with the longitudinal direction thereof in the same direction, and one long side of each absorber is bonded to the stretchable sheet. It is fixed.
- the respective absorbers are arranged so as to overlap each other in the width direction, and at this time, even when the stretchable sheet is extended, the absorbers are continuously provided with a sufficient overlap amount so as to maintain the overlapping state of the absorbers. Since each flat absorbent body is fixed to the stretchable sheet only on one long side, the stretchability in the direction orthogonal to the long side is ensured rather than fixing the integral absorbent body covering the entire area to the entire surface. However, the stretchability in the long side direction is not improved and is not different from the conventional one. The same is true for bendability and it cannot cope with complex deformation.
- Patent Document 4 discloses an absorbent product configured using a composite sheet composed of a laminate of a nonwoven fabric layer and a fiber web layer as a top sheet, and combined with an absorbent body.
- the composite sheet is a grid-like belt-like region having a high density and a thin thickness in a plan view, and a rectangular region partitioned by the lattice-like region, and has a low density and a low thickness.
- a thick second network region is formed as a region having a higher density than the second network region by pressing a bulky fiber web with the nonwoven fabric layer in the region. That is, the nonwoven fabric fibers are crushed in the first network region.
- the fiber web is disposed on the entire surface of the nonwoven fabric layer, and the basis weight does not change and is not divided as a whole. Therefore, the composite sheet has excellent stretchability, adaptability to the body and followability. The conversion is very limited.
- the present inventors have extremely high "human body compatibility” that fits without any gaps on the skin surface of the wearer that is deformed flexibly and undulates,
- An absorber has been developed that has an extremely good "trackability” that can follow the deformation caused by the wearer's movement (see Japanese Patent Application No. 2007-316239 [JP 2009-136498 A], Japanese Patent Application No. 2007-332419).
- the subject of this invention is related with providing the absorbent body which improved the absorption holding
- the plurality of absorbing parts are separated from each other and joined to the base sheet via the fixing part, and the fixing part is included in the area of the absorbing part in plan view, and the plurality of absorbing parts Absorbers are provided that are arranged in fluid communication with each other.
- the absorbent body of the present invention has extremely high “human body compatibility” and “motion followability”, and also achieves high absorption retention of liquids and the like even when subjected to deformation such as stretching and bending.
- FIG. 1 is a partially cutaway perspective view schematically showing an absorbent article (a sanitary napkin) using an absorbent body according to an embodiment (first embodiment) of the present invention.
- FIG. 2 is a cross-sectional view taken along line II-II in FIG. It is the partial top view which showed typically the absorber which concerns on one Embodiment of this invention.
- FIG. 4 is a partial cross-sectional view schematically showing a state at the time of deformation in a cross section taken along line IV-IV in FIG. It is the fragmentary top view which showed the absorber which concerns on the example of a change of this embodiment in the area
- FIG. 6 is an enlarged plan view illustrating the dimensional relationship of each part of the absorption unit illustrated in FIG. 5. It is the top view which showed the state (b) when it was made to expand
- FIG. 2 is a cross-sectional view taken along line IX-IX in FIG. It is the top view which showed the state when it was made to extend
- FIG. 1 is a partially cut perspective view of an absorbent article (sanitary napkin) 100 using the absorbent body according to the first embodiment of the present invention
- FIG. 2 is a cross-sectional view taken along the line II-II in FIG. It is.
- the absorbent body 10 of the present embodiment is arranged in the vertical and horizontal directions so that a large number of independent absorbent parts 3 have predetermined gaps d and e in the natural state on the surface (upper surface) of the stretchable base sheet 2. It is installed.
- the absorption portion 3 is rectangular in plan view, and has a truncated trapezoidal shape (a truncated pyramid) having a horizontally long trapezoidal cross section and a slightly rounded surface.
- the shape is not particularly limited, and any shape can be adopted.
- the absorption part 3 is comprised from the pulp fiber and the superabsorbent polymer,
- the outline may not be a fixed shape like what was illustrated, and it shall be the thing of the solid shape mentioned above as a whole. It is preferable.
- the absorber 3 is trapezoidal in cross section, and the area of the front side surface 3a is slightly smaller than the area of the back side surface 3b. Then, the side surface 3c is inclined (sloped) toward the back surface so as to widen toward the end in the cross section.
- Each absorbing portion 3 is not the entire back surface, but only a part, specifically, only the fixing portion 4 (refer to the central portion t of the back surface 3b in the enlarged view of FIG. 2) included in the area of the absorbing portion in plan view. It is fixed.
- the projection image of the fixing unit 4 is included in the projection image of the absorption unit 3 when the projection images of the absorption unit 3 and the fixing unit 4 are projected in the thickness direction of the absorber.
- the fixing part 4 does not exhibit elasticity.
- the fixing part 4 can be formed by, for example, ultrasonic embossing, whereby the stretchability of the base sheet 2 is lost at this part. Moreover, you may form the fixing
- the hollow portion 3k has a high density, a dense gradient can be formed between the hollow portion 3k and the other portions, the liquid can be easily drawn around the center, and the absorbability is improved.
- the lower surface 3b of the absorption part 3 is not adhered to the base sheet outside the fixing part 4, and the stretchability of the base sheet 2 is maintained in the outer region s corresponding thereto.
- the portion joined to the base sheet 2 is held in the region t corresponding only to the fixed portion 4 in this way, the shape and function of each absorbent portion 3 are hardly affected by the expansion and contraction of the base sheet, and exhibit stable absorption performance. can do.
- the existence of the absorbent portions 3 independently as described above allows the base sheet 2 to be stretched and bent extremely flexibly as a whole without excessively restricting the movement of the base sheet 2. Can be. As a result, the deformability of the absorbent body as a whole with respect to the wearer's movement is ensured.
- the absorbent part 3 is in fluid communication during expansion and contraction and has a high and stable absorbency. Can be maintained when worn.
- the absorbing portions 3, 3, 3,... are separated in the longitudinal direction, that is, the interval d is increased.
- the width direction of the sanitary napkin 100 approaches so as to contract, and the interval e decreases.
- the absorbers 3, 3, 3... Maintain the cooperation related to the transmission of the liquids and the like while the absorber 10 is deformed as a whole, and exhibit good absorption retention of the liquids and the like.
- the liquid communication means that when an extension force is applied to the absorbent body, the absorbent parts come close to or come into contact with each other so that a liquid or the like can be transmitted between the absorbent parts.
- the distance (gap d, e) between the absorbent parts in a state where such an extension force is applied is not particularly limited, but may approach 0 to 30 mm due to a general extension force (for example, 100 cN / 25 mm) generated during wearing. Preferably, it is closer to 0 to 10 mm. Further, it is more preferable that the distance is close to 0 to 5 mm.
- the absorbent body 10 of the present embodiment is composed of a set of a large number of independent small absorbent parts, the “body compatibility” that fits the undulations on the skin surface is greatly increased as compared with the conventional one.
- “movement following” is very good because it follows the movement of the wearer well and prevents a partial gap from occurring on the skin. According to the present embodiment, it is possible to achieve both such good deformability and good absorption and retention of liquid and the like that are not affected by the deformation.
- the small absorption parts fractionated as described above are arranged on the base sheet in a specific arrangement, it is suitable for a skin surface that bends in an extremely complicated manner.
- a sanitary napkin when stretched from the excretion point to the buttocks, it bends in the longitudinal direction along the roundness of the buttocks, but the included conventional absorbent body is generally much higher in rigidity than other members. You may buckle.
- the internal absorber In relation to this buckling deformation, the internal absorber is difficult to enter the crack, and a large gap may open here. That is, it is difficult to achieve both the buckling in the longitudinal direction and the bending in the width direction, and it is difficult to obtain a sufficient fit.
- menstrual blood or the like easily migrates through the space that has been ruptured, which may cause leakage in the back direction at bedtime.
- a so-called saddle shape or hyperbolic parabola surface that gently curves and fits in the roundness of the buttocks while appropriately entering the crack. It deforms into a shape and fits almost without leaving a gap in the cleft.
- abuts almost without a gap from the excretion point vicinity to a buttocks is implement
- the sanitary napkin of the present embodiment has a very high shape restoring property, even if it is folded into three folds at the time of individual packaging, for example, it is difficult for folds to remain, and the above-mentioned good body fit from the beginning of wearing And followability.
- the absorbing portions 3 are arranged in a staggered arrangement.
- the staggered arrangement means an arrangement in which the pitches of the absorbing portions in adjacent rows are shifted when the rows of the plurality of absorbing portions are arranged in parallel.
- this arrangement is an arrangement that does not coincide with the projected image of the adjacent absorber 3 when the absorber 3 in a predetermined row is projected in the orthogonal direction. This specific example will be described with reference to FIG. 7. Absorbing part rows A juxtaposed to the absorbing part row B extending in the longitudinal direction (X direction) are adjacent to each other, and this is repeated alternately.
- auxiliary line t b continuing in the direction (Y direction) perpendicular to the direction of extension of the central absorbent portion row B in the plan view of the absorber column B.
- auxiliary line t a in the absorption unit column A.
- Such auxiliary lines t a and the auxiliary line t b is shifted by a half pitch from each other, i.e. distance between the auxiliary line t a and the auxiliary line t b constitutes a sequence has been staggered to equal throughout.
- the absorption row portion A and the absorption portion row B are set in the width direction (Y direction) of the absorbent body by rotating the pitch shifting direction by 90 °, and in the longitudinal direction (X direction).
- difference to the extended auxiliary line is mentioned.
- the staggered arrangement is viewed as a masonry, it can be said to be a fabric, and examples of this variation include the twill weave, the yaba pile, and the turtle shell pile.
- the absorbent body 10 in which the plurality of absorbent portions 3 are disposed on the base sheet 2 as described above is disposed on the back sheet 7, for example in a spiral shape.
- the side sheets 8 are fixed to both sides of the back sheet 7 in the longitudinal direction by hot melt or heat sealing on the outside thereof, and the top sheet 1 is sandwiched and fixed on the inside thereof.
- the peripheral edge g of the napkin is fixed to the whole by heat sealing or the like so that the components of the absorbent body contained therein, the liquid once absorbed or the like does not leak.
- a topsheet 1 is disposed on the absorber 10 so as to cover almost the entire surface, and a groove 11 is formed by embossing a cloud pattern in a plan view from the topsheet 1 to the absorber 10 to absorb the topsheet 1. Deviation from the body 10 is suppressed (the groove 11 is not shown in FIG. 2).
- the top sheet 1 side is the side in contact with the skin
- the back sheet 7 side is the side in contact with the underwear.
- FIG. 3 is a partial plan view schematically showing the absorber according to the first embodiment of the present invention.
- FIG. 3A shows a state before the absorber 10 is deformed, and FIG. Indicates the state when deformation is caused by pulling in the longitudinal direction.
- FIG.3 (b) although a wrinkle and a wrinkle may be produced in the base sheet of an absorption part, this is not drawn. Further, in the same figure, the recess 3k is not shown, and the fixing portion 4 is indicated by a broken line.
- each absorbing portion 3 is fixed to the base sheet 2 only by the central fixing portion 4 in plan view as described above, the entire absorbing portion 3 is also affected by the sag and sagging of the absorbent body 10.
- the planar shape of is less affected.
- the liquid absorptivity of the absorber 10 is not easily lowered, and the above-described liquid communication ensures a stable absorptivity and liquid transmissibility when worn. In consideration of such a direction of liquid communication at the time of expansion and deformation, the direction and location of incorporation into the absorbent article may be appropriately determined. If the size of the absorbent portion 3 according to Embodiment 1 of FIG.
- the width T is preferably 1 to 50 mm, preferably 2 to 30 mm when considering use in a sanitary napkin, although it varies somewhat depending on the absorbent article to be incorporated. More preferred.
- the vertical width S is preferably 3 to 100 mm, and more preferably 5 to 80 mm.
- the pitch P 2 of the above 2 ⁇ 60 mm is preferred.
- the gaps d and e are preferably 0.1 to 30 mm and 0.1 to 30 mm, respectively.
- each absorption part 3 of this embodiment becomes the inclined surface 3c, even if the absorption part 3 will be in the state which adjoined, the compatibility to a body is favorable, there is no sense of incongruity, and it wears Fits the body shape of the part well. For example, if a model having a simplified cross-sectional shape is shown, even if a deforming force is applied to the absorbent body 10, as shown in FIG. As shown in b), when the adjacent absorbers 3 are folded so as to be close to each other, the shoulders of both absorbers are chamfered, so that they do not relax and do not hinder the body compatibility or the motion following ability.
- FIG. 5 is a partial plan view schematically showing the absorbent body 10 according to a modified example of the first embodiment of the present invention
- FIG. 6 is an enlarged view showing the relationship between the extracted dimensions of the absorbent section.
- the shape of the absorber 3 in plan view can be bundled in the middle, specifically, a polygon in which V-shaped bent portions 3j are arranged on both sides (long sides) of a rectangle. (Inverted hexagon).
- a figure in plan view when a figure in plan view is defined, it includes a shape in which corners of the figure are chamfered or rounded.
- it is set as the staggered arrangement
- the inverted hexagonal absorbing portions are arranged in a staggered manner so that the hypotenuses bound to the V shape face each other in parallel.
- FIG. 5A shows the state of the absorbent body before deformation
- FIG. 5B shows the state when the absorber is deformed by applying a tensile force.
- Each absorption part 3 on the base sheet 2 is spread on the base sheet 2 in the vertical direction (X direction) and the horizontal direction (Y direction), and adjacent ones in the horizontal direction are the pitches of the absorption parts in the vertical direction.
- there is a staggered arrangement so as alternately arranged in a lateral direction in the longitudinal direction spacing of approximately semi pitch P 2 of P 1.
- FIG. 5 (a) in the natural state (relaxed state) in which the absorber 10 is not deformed such as squeezing, there are vertical and horizontal gaps d and e between the absorbent parts 3. ing.
- the tensile force of a vertical direction is applied to the absorber 10 in the state at the time of wear of the absorbent article using the absorber 10 of this Embodiment 2, and it turns in a horizontal direction (Y direction).
- Y direction a horizontal direction
- the absorption portions 3 adjacent to each other in the horizontal direction are inclined on one side 3g of the V-shaped bent portion in plan view.
- liquid communication is made close.
- the proximity or contact area of the V-shaped slope is longer than in the first embodiment, and liquid communication is performed in this long proximity area, so that better transmission of liquid or the like can be obtained.
- the absorbent body 10 can be easily deformed in a balanced manner in the vertical and horizontal directions, and the body fits without unevenness. Performance and operation followability and absorption retention such as liquid can be realized.
- the constriction angle ⁇ of the V-shaped bent portion 3j on both opposing sides of the absorbing portion 3 is 90 ° or more and less than 180 °, and preferably 100 ° to 170 °. Further, in the present embodiment, when the length between the bottoms of the constricted valleys is L 2 and the length of the side portion perpendicular to the vertical direction (X direction in the figure) is L 1 , L 1 > L 2 is formed.
- the polygonal absorbing portion 3 having the V-shaped bent portion 3j is fixed to the base sheet 2 only at the fixing portion 4 at the center thereof, and contacts the base sheet 2 on the back surface outside the fixing portion 4. Just do not fix.
- the lateral width L 1 is preferably 1 to 50 mm, and L 2 is preferably 1 to 50 mm.
- the vertical width W is preferably about 3 to 100 mm.
- an absorbent material may be disposed in a space portion between the absorbent portion 3 and the absorbent portion 3 so that the basis weight is lower than that of the absorbent portion 3.
- the absorptive material is preferably the same component as the pulp fiber, the absorptive polymer and the like constituting the absorbing portion 3, but is not necessarily limited thereto.
- the constituent material of the absorbing portion 3 is not particularly limited, and a fiber material, a porous body, a combination thereof, or the like can be used.
- fiber materials include natural fibers such as wood pulp, cotton and hemp, polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate, single fibers made of synthetic resins such as polyvinyl alcohol resin, and these resins.
- a composite fiber containing two or more kinds, or a semi-synthetic fiber such as acetate or rayon can be used.
- the fiber may be a heat-shrinkable fiber whose shape changes with heat.
- the fineness is increased by heat, but the fiber length is shortened, and the fineness is hardly changed by heat, but the length occupied by the apparent fiber is shortened by changing the shape to a coil shape. May be.
- the porous body sponge, non-woven fabric, aggregate of superabsorbent polymer (aggregate of superabsorbent polymer and fiber) and the like can be used.
- the superabsorbent polymer contained in the absorbent part 3 is preferably one that can absorb and retain a body fluid that is 5 times or more of its own weight and that can gel.
- the shape is not particularly limited and may be spherical, massive, grape-like, powdery or fibrous. It is preferably in the form of particles having a size of 1 to 1000 ⁇ m, more preferably 10 to 500 ⁇ m.
- examples of such superabsorbent polymers include polyacrylic acid and salts thereof, and polyacrylate graft polymers such as starch, crosslinked carboxylmethylated cellulose, polymers or copolymers of acrylic acid or alkali metal acrylates. Coalescence can be mentioned.
- the polyacrylic acid salt a sodium salt can be preferably used.
- acrylic acid may contain a comonomer such as maleic acid, itaconic acid, acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, 2- (meth) acryloylethanesulfonic acid, 2-hydroxyethyl (meth) acrylate or styrenesulfonic acid.
- a copolymer copolymerized within a range not deteriorating the performance of the superabsorbent polymer can also be preferably used.
- the ratio of the superabsorbent polymer to the weight of the absorbent part 3 is preferably 5 to 95% by weight.
- the absorbent body 10 is used as an absorbent body for a sanitary napkin or an article used to absorb a liquid with a low excretion such as light incontinence, the ratio of the superabsorbent polymer to the weight of the absorbent portion 3 is 10 to 30% by weight is preferred.
- the proportion of the superabsorbent polymer in the weight of the absorbent portion 3 is 50 to 80% by weight. It is preferable.
- the stretchable absorbent body 10 has a 0.9% by weight sodium chloride aqueous solution retention amount of 0.1 g / g or more, particularly 1 g / g.
- the above is preferable from the standpoint of stable absorption performance even when the base sheet 2 expands and contracts.
- fibers having high hydrophilicity and high capillary force for example, pulp, rayon, etc.
- a sheet having a function of drawing and diffusing excreted liquid As the base sheet 2 to which the absorption part 3 is fixed, a sheet having a function of drawing and diffusing excreted liquid is used.
- seat which has such a function the nonwoven fabric and film which contain the fiber which has hydrophilic property, or was processed with the hydrophilic oil etc., a porous body, etc. are mentioned, for example.
- These sheets may be in a single layer state or may have a multilayer structure in which a plurality of layers are laminated to form a single sheet.
- seat which has a stretching property is preferable, and can use it without a restriction
- a three-dimensional network is formed in the structure by means of a nonwoven fabric (elastic nonwoven fabric) containing fibers containing elastic resin as a constituent fiber, a film containing elastic resin (elastic film), or foaming. And an elastic porous body made of an elastic resin.
- a nonwoven fabric elastic nonwoven fabric
- the elastic film, and the elastic porous body those known in the technical field can be used.
- the basis weight of the base sheet 2 is preferably 5 to 50 g / m 2 , particularly preferably 10 to 30 g / m 2 .
- the degree of stretchability of the base sheet 2 is such that the stretchability measured by the following method is 60% or more, particularly 80% or more, and the suitability to the wearer's body shape and the operation followability are particularly good. It is preferable from the point.
- the expansion / contraction rate is measured by the following method. Measurement is performed in a tensile mode using a tensile compression tester RTC-1210A (Toyo Orientech Co., Ltd.). First, the base sheet 2 is cut into a width of 25 mm and a length of 150 mm, and a measurement piece is collected.
- ⁇ Test> A test piece was set on a tensile / compression tester at a distance L between chucks, and the test piece was raised to 100 ⁇ (L / 30) mm / min until the measurement piece was extended by 50% of the initial sample length.
- the top sheet is preferably made of a soft material that is liquid-permeable and hits the skin.
- a non-woven fabric made of natural fibers such as cotton or a non-woven fabric made of various synthetic fibers subjected to hydrophilic treatment can be used.
- the back sheet is preferably made of a liquid-impermeable sheet material.
- the back sheet may be water vapor permeable as required.
- a film made of synthetic resin such as polyethylene in which fine powder made of a filler such as calcium carbonate is dispersed is stretched and a porous film having fine holes is used.
- the side sheet include a nonwoven fabric, a film sheet, and paper.
- the side sheet is preferably formed of a liquid non-permeable or hardly permeable hydrophobic nonwoven fabric, a leakage-proof film sheet, or the like.
- One sheet may be used, or two or more sheets may be combined with a functional sheet.
- Japanese Patent Application No. 2007-316239 Japanese Patent Application Laid-Open No. 2009-136498
- Japanese Patent Application No. 2007-332419 can be further referred to for the constitution or materials of the base sheet and the absorption part.
- the absorbent body is not limited to such an absorbent article, but is similarly applied to disposable diapers, infant or elderly diapers, and other incontinence pants. Is possible.
- the absorbent body according to the first embodiment it is deformed flexibly into various human body shapes, and fits well to the wearer's human body shape and does not give an uncomfortable feeling when worn. Further, various effects are brought about, such as well following the deformation of the wearing part due to the operation, and the deterioration of the absorption performance due to the deformation does not occur.
- the second embodiment of the present invention will be described by omitting the same parts as those in the first embodiment.
- the first embodiment and the second embodiment are not independent and exclusive.
- the second embodiment may be positioned as included in the subordinate concept of the first embodiment. it can.
- the invention according to the first embodiment and the invention according to the second embodiment have a technical relationship in which a single inventive concept is formed and linked based on the same or corresponding special technical features.
- the same reference numerals are used for the corresponding members and the like (however, the dimensions and the detailed positional relationship are in accordance with the drawings corresponding to the respective embodiments).
- the feature to be emphasized in the second embodiment is that, as shown in FIGS. 8 and 9, a space Q having the base sheet as the bottom surface in the plan view is formed between the absorbing portions 3, 3, 3. It is formed, and the absorbent material 6 is arranged in the space Q so that the basis weight is lower than that of the absorbent portion 3.
- the absorbent portion 3 and the absorbent material 6 laid in the space Q with such a basis weight distribution, the absorption rate in the thickness direction is improved and the diffusibility of the liquid flowing through the space portion is improved.
- the effect of spreading the liquid is improved compared to the case where there is no absorbent material in the space even when the absorbing portion 3 does not communicate due to operation or deformation of the absorber.
- the absorbent material 6 is preferably the same component as the pulp fiber or superabsorbent polymer constituting the absorbent part 3, but is not necessarily limited thereto, and has a composition different from that of the constituent material of the absorbent part 3.
- An absorbent material may be placed.
- the absorbent material 6 is composed of pulp fibers 6a and superabsorbent polymer beads 6b.
- the basis weight of the absorbing portion 3 is 20 to 800 g / cm 2, and more preferably 100 to 600 g / cm 2 .
- the basis weight of the absorbent material 6 in the space Q part between the absorbent parts 3 is preferably 2 to 500 g / cm 2, and 5 to 300 g / cm 2 is preferable in terms of optimization of the above properties.
- the basis weight ratio between them is preferably 80% or less, more preferably 50% or less, Further, it is preferably 30% or less, and particularly preferably 10% or less.
- the lower limit of the basis weight ratio is not particularly limited, but is practically 0.1% or more.
- the hydrophilicity of the entire absorbent body is improved by laying the absorbent material 6 such as a small amount of pulp or SAP in the space Q as described above. For this reason, the liquid uptake speed from the surface material is increased.
- the absorbent material 6 such as pulp or SAP in the space
- the liquid easily spreads through the space. That is, even if it is not connected, the diffusibility of the liquid can be ensured to some extent, so that the absorption performance of the base is improved.
- the liquid diffusion is further improved by the communication.
- the relationship between the absorbing part 3 and the fixing part 4 is the same as in the first embodiment.
- the dynamic action is substantially the same, but will be described below in accordance with the present embodiment.
- the absorbers 3, 3, 3... Maintain the cooperation related to the transmission of the liquids and the like while the absorber 10 is deformed as a whole, and exhibit good absorption retention of the liquids and the like.
- the absorptive material 6 is laid between the absorbing portions 3, 3, 3,. For this reason, the hydrophilic property as the whole absorber improves, and the uptake
- the absorbent body 10 of the present embodiment is composed of a set of a large number of independent small absorbent parts, “body compatibility” and “motion followability” are extremely good. This point is the same as that described in the first embodiment. Further, the staggered arrangement of the absorbing portions shown in FIG. 10, the horizontal width T, the vertical width S, the pitch P2, the preferable dimensions of the gaps d and e, and the joining structure of each member are the same as in the first embodiment. .
- the absorbent article of each of the above embodiments or further modifications thereof it is folded into three folds at the time of individual wrapping, and even if the form is maintained for several months in distribution and sales, the folds caused thereby are not likely to remain, The form is quickly restored and the above-mentioned good body compatibility and followability can be obtained from the beginning of wearing. The operation regarding this point will be described below.
- a plurality of absorbent parts (absorbent small members) 3 are arranged with an interval, and a space Q is formed between them. Therefore, even if it is a folded form, a wrinkle does not easily arise in a surface sheet. Further, as will be described later, a part of the surface sheet is accommodated in the space Q during compression, so that the pressure received is relieved, and bulk recovery when the surface sheet is released from the compression is easily performed. Further, as in the present embodiment, the trapezoidal shape in which the cross section of the absorbing portion 3 is tapered toward the surface sheet side can provide a higher crease relaxation effect of the surface sheet. If this is referred to in the model shown in FIG.
- the topsheet 1 of this example includes a hardened portion 1c, a semi-hardened portion 1b, and a flexible portion 1a by embossing.
- the space Q is naturally shaped so that its cross section extends toward the top sheet, and a part of the top sheet, particularly the flexible portion 1a, is accommodated in the space Q when the absorbent article is individually packaged. It is made into the state where it is easy to be done (the accommodated surface sheet part is modeled by accommodating part 1 '). As a result, the compressive force applied in the thickness direction while part of the topsheet 1A is deformed to the space Q side is prevented from remaining and creases remain, and the decrease in the bulk of the topsheet is suppressed.
- the absorbent body is also less likely to remain crushed compared to the conventional one, and in combination with the effect of improving the significant crease of the surface sheet, the absorbability, in particular, the liquid passage property. Since it is maintained in good condition, it achieves a very stable and high dry feeling.
- the interrupted view is based on a folded state, but is shown in the same form in consideration of the comparison with the upper limit view.
- FIG.11 (b) is the surface sheet 1B of another example
- the constituent fiber 1d has the orientation toward the surface on the back surface side from the surface side surface.
- FIG. 11 (c) is a top sheet of another example.
- FIG. 11D shows a conventional topsheet 1D and its fibers 1g, and many fibers are oriented in the surface direction of the sheet.
- a conventional structure in which such a top sheet and a flat absorbent body 39 having no space are combined the thickness of the folded and compressed top sheet cannot be recovered.
- the top sheet 1 can be made of a conventionally known material / configuration, but in order to further enhance the effect of reducing crushing against compressive force, a synthetic fiber nonwoven fabric, in particular, fibers and fibers by an air-through method or a steam jet method. It is preferable that the nonwoven fabric is fused at the intersection of the points from the viewpoint of recovering the thickness of the portion affected by the compressive force.
- the convex part In the ridge groove structure in which the convex part is continuous in one direction, if the thickness recovery is weakened by the influence of the crushed convex part due to the continuous ridge part (convex part), it is individually independent It is more preferable to apply the convex shape.
- the concave portion is made denser than the convex portion by embossing or the like, the semi-cured portion 1b and the cured portion 1c around the concave portion are less crushed than the convex portion, and the concave portion overlaps the absorbing portion.
- part becomes lower than the surrounding absorbent member, and an independent convex part form is preferable also from the point which forms the clearance gap which suppresses crushing of a surface sheet.
- the inclined portion of the convex portion of the concavo-convex structure may have the same structure, but from the embossed concave portion described in Japanese Patent Application No. 2008-331374.
- a shape formed by extending in parallel is preferable, and a nonwoven fabric in which fibers are oriented in the longitudinal direction by blowing a gas flow by an air-through method or a steam jet method is preferable.
- the average inter-fiber distance (I e ) of the parallel fiber group layer 1e is larger than the average inter-fiber distance (I f ) of the cross fiber group layer 1f. (I e > I f ).
- a method of making the average inter-fiber distance different between the front surface side and the back surface side a method of thickening the fibers to be used, selection of fiber resin, etc.
- a network structure by increasing the rigidity of the joint portion of the fibers Although it has a high recovery effect from crushing, in consideration of the texture of the nonwoven fabric, it is possible to improve the resin capacity of the fusible part of the fiber, and further to increase the fusion part at the bonding point. It is more preferable in that a large number of parallel coupling portions are provided on the surface side to increase the distance between the fibers on the surface side, and the structure of the nonwoven fabric can be easily recovered from crushing.
- the surface sheet is hydrophilic as a whole, but it can be formed by dividing the hydrophobic side portion and the hydrophilic side portion in plan view.
- the dry feeling can be enhanced, which is preferable.
- the convex portion of the concavo-convex structure is on the hydrophobic side / the concave portion is on the hydrophilic side, so that the movement of the liquid in the topsheet can be further enhanced to further improve the dry feeling.
- the density (D 1 ) of the top sheet 1 is lower than the density (D 3 ) of the absorbing portion 3.
- the high capillary force due to the high density (D 3 ) of the absorbing portion 3 (D 3 > D 1 ) not only improves the liquid permeability of the topsheet 1 but also reduces the remaining amount of liquid. can do.
- positioned the low density absorbent material 6 comprised with the material similar to the absorption part 3 has higher surface hydrophilicity than the fiber material of the surface sheet 1, from the fiber surface which contacted Liquid can be drawn.
- the absorber whole surface is made easy to draw
- the remaining amount of the liquid of a surface sheet can reduce, and a dry feeling can further be improved.
- the density of the surface sheet 1 is higher than the density of the absorbent material (low density part) 6 (D 3 > D 1 > D 6 )
- the surface sheet is more difficult to be crushed.
- the density means a value measured as follows unless otherwise specified. ⁇ 1> Density of absorbing part (D 3 ) Since the density is obtained by dividing the weight (g) by the volume (cm 3 ), the weight and the volume of the absorption part are measured. The weight is cut into a size of 5 cm ⁇ 5 cm and measured. (A value obtained by arithmetically averaging the values obtained from three places or three absorbent articles is used as the weight of the sample.) The volume is measured using a sample whose weight is measured, and a high-precision shape measurement system KS-1100 (manufactured by Keyence) Product name) and KS-Analyzer (product name) are used.
- KS-1100 manufactured by Keyence
- Product name product name
- KS-Analyzer uses the measurement data after correcting it from the “Correction” menu. The correction was set with a size of 3 ⁇ 3, the number of executions of 1, and a degree of 100. Next, measurement is performed in the entire area of the “measurement” menu (thus, the measurement range is 4 cm ⁇ 4 cm), and the density is obtained from the weight and volume obtained by taking the average value of the three cut out samples as the volume.
- the cross-sectional shape is trapezoidal or semicircular, etc.
- the shape can be grasped from the top surface, the base on which the sample is placed is the baseline (0 value), but the cross-section is hexagonal (Fig. 12 (c)), etc.
- an appropriate volume value is obtained by appropriately setting a baseline when measuring from the upper and lower surfaces, or by using a total value obtained by measuring individual absorption portions.
- the outline part of an absorption part may be unraveled at the time of manufacture, and when it does so, this part will become a little indefinite shape, or the division with an absorptive material may become ambiguous.
- measurement is performed by performing processing described in ⁇ 3> Absorbent material fiber density (D 6 ) described later.
- ⁇ 2> Fiber density of surface sheet (D 1 ) If a flat surface sheet, a thickness of T 0 by the measurement of the weight and the measured size and KES-G5 Handy Compression Tester, can measure the density from the weight and volume, if having an uneven structure, and the ⁇ 1> Similarly, the weight and volume are measured, and the density (D 1 ) of the surface sheet is calculated. When there is an intermediate member of the intermediate sheets between the top sheet and the absorbent portion, the average density of the surface sheet member including the intermediate member and the density (D 1).
- Density of absorbent material (D 6 ) The calculation of the density D 6 of the absorbent material is performed before the measurement of the absorption part. Weight of the sample after removing the absorbent material between the absorbent parts after measuring the volume by measuring 5cm x 5cm of the sample size and measuring the volume with Keyence high precision shape measurement system KS-1100 and KS-Analyzer and by volume measured by subtracting the weight and volume of the absorbing portion from the original weight and volume, weight and volume of the absorbent material is obtained, the density D 6 can be calculated.
- the absorbent material between the absorbent parts is preferably removed by tweezers or the like.
- the calculation of the density of any of the above members does not include a portion where a constituent material such as an opening does not exist, but the density defines and calculates a predetermined region including a relatively small structural portion in a convex portion or a concave portion,
- the average density is calculated as the density of the structure portion obtained by averaging the convex portions and the concave portions.
- each absorbing portion since the density gradient between the top sheet and the absorbing portion is used, when the amount of liquid that has passed through the top sheet is small, each absorbing portion quickly absorbs.
- the space Q or the absorbent material 6 laid there is in the separated portions of the individual absorbing portions, so the liquid should be temporarily stored in this portion. Can do. Therefore, even when menstrual blood or the like is excreted, the liquid hardly diffuses on the surface sheet, and the dry feeling on the surface sheet can be enhanced.
- a state in which pressure is normally applied in the thickness direction of the absorbent article continues.
- the thickness of a surface sheet and an absorber is crushed, and the space which a liquid passes easily is crushed especially by the reduction in bulkiness in a surface sheet. If it does so, the passage resistance of a liquid will increase and the residue of the liquid in a surface sheet will increase remarkably.
- the space that can accommodate a part of the surface sheet is formed in the absorber, so that pressure is not easily applied to the surface sheet, It is possible to realize a stable wearing performance that does not impair the passability of the.
- FIG. 12 is an enlarged cross-sectional view schematically showing the state of the absorbent portion and the absorbent material according to each embodiment of the absorbent article of the present invention.
- Various types of absorbers as shown in the figure can be used.
- the absorbent section 3 having a trapezoidal cross section similar to the first embodiment depressions corresponding to the individual absorbent sections 3 are formed in the stacking drum at the time of manufacture.
- this absorption part is transferred to the back sheet, it is preferable that the absorption part 3 can be accurately formed in the space Q by being pushed out by air.
- the air extrusion amount is It is preferable to increase. Or it is preferable to spray an airflow in the process different from a fiber drum from the surface sheet side or the back surface sheet side from the point formed more reliably. At this time, it is preferable to carry out the process after transferring and fixing to the base sheet 2 from the viewpoint of eliminating the disturbance of the aligned absorbing portions 3 and improving the passage of air.
- FIG. 12B and 12C show the cross-sectional shape of the absorbing portion 3 that can be formed by the same method.
- it is a semicircular cross-sectional shape, it will be in a low contact state with a surface sheet, and the collapse of the surface sheet by compression can be made relatively low compared with a trapezoid.
- the embodiment shown in (c) by providing a liquid diffusion gap or a low-density portion on the back sheet side as well, a structure that is hardly affected by the mounting state (mainly mounting pressure) can be obtained.
- FIG. 13 is an enlarged perspective view schematically showing the arrangement of the absorbent portion according to each embodiment of the absorbent article of the present invention.
- (A)-(c) of the same figure has shown the arrangement
- FIG. 13 Thus, with the form which does not have the absorptive material 6 in the space Q, the extrusion by the said air flow was reduced at the time of the manufacture, and the surface part of the absorption part 3 was reduced, and it applied to the back surface sheet 7 The transfer is performed by the pressure-sensitive adhesive, and the diffusion of the liquid through the gap between the absorbent bodies is more advantageous. This enhances the dry feeling of the topsheet of the absorbent article, and the topsheet 1 conforms to the shape of each absorbent sheet 3 on the topsheet side, thereby reducing the remaining amount of liquid.
- FIG. 14 is a cross-sectional view schematically showing a sanitary napkin according to still another embodiment of the absorbent article of the present invention.
- FIG. 14 is sectional drawing of the sanitary napkin 300 which has arrange
- This sanitary napkin 200 has the same structure as that of the sanitary napkin 200 of the second embodiment except that an intermediate layer is provided, and different parts will be described below.
- the intermediate sheet 9 in addition to the nonwoven fabric obtained by the air-through method or the steam jet method as in the case of the surface sheet, a sheet in which holes (slits) are formed can be used.
- the intermediate sheet preferably has no irregularities, and its fiber density (D 9 ) is higher than the fiber density (D 1 ) of the top sheet, and the fibers of the absorbent portion 3 It is preferable that the density is lower than the density (D 3 ) (D 3 > D 9 > D 1 ).
- the fiber density of the intermediate sheet can be measured in the same manner as for the top sheet.
- the absorbent article has a dry feeling and a good cushion feeling, and the transportability of the absorbent body during production is stabilized. Moreover, it becomes difficult to maintain the crushing against crushing due to compression.
- an absorbent material 6 between the absorbent parts 3 can be obtained by using a non-woven fabric web layer such as fiber fusion or a fluffed sheet on one side of the intermediate layer. Even in the case where there is no liquid or a structure in which flattening is not performed, the contact property with the absorbing portion 3 is improved, and the remaining amount of liquid is easily reduced.
- the present invention is not construed as being limited by the above-described embodiments.
- the plurality of absorbing portions 3 may have several thicknesses in addition to the same thickness.
- the side part of the absorbent part is lower than the center, or in order to reduce crushing due to compression of the surface sheet, two or three kinds of absorbent parts with different heights are combined, or It is possible to employ a mixed structure.
- An absorbent body test body having the form shown in FIG. 7A was produced (however, the dimensions of each part are described based on the reference numerals shown in FIG. 3).
- the absorber used pulp / superabsorbent polymer mixture of (200 / 50g / m 2) , as the base sheet with a styrene ethylene-propylene copolymer (SEPS, 13g / m 2) nonwoven.
- SEPS styrene ethylene-propylene copolymer
- the absorption part was fixed to the base sheet using ultrasonic embossing (radius 1.0 mm).
- FIG. 7 (b) is a plan view showing a state in which the absorbent body test body is elongated by 30% in the length direction.
- the rectangular absorbent parts 3 were arranged in a staggered arrangement on the base sheet 2 while maintaining substantially the same gap in the vertical and horizontal directions. From this state, when the entire absorbent body 10 was extended in the longitudinal direction of the absorbent body (X direction), the absorbent body 10 contracted in the width direction (Y direction). In this test example, the elongation ratio in the longitudinal direction was 30%, and the contraction ratio in the width direction was 14%.
- each absorbent portion 3 is fixed to the base sheet 2 only by the central fixing portion 4 (FIG. 2), so that the individual shape is not affected and only the base sheet 2 is extended. It can be seen that the gap between the absorption portions 3 in the longitudinal direction becomes large. At this time, in the extended state (FIG. 3 (b)), it was confirmed that the liquid transmission between the adjacent absorption portions 3 was effectively performed in the vertical and horizontal directions between the absorption portions as indicated by arrows f and h.
- test body c11 pulp / SAP (200/50 g / m 2 ) continuous body (75 mm ⁇ 200 mm) was used as the absorbent as the above-mentioned commercially available sanitary napkin (comparative example).
- a general underwear fabric 45% cotton, 45% rayon, 10% polyurethane cut out in the same form as the above-mentioned commercially available sanitary napkin was prepared (specimen s11) (reference example).
- Table 1 summarizes the results of measurement of bending moment and shear stress using the test specimens of Examples, Comparative Examples, and Reference Examples according to the following procedures.
- KES-FBS-L (trade name) was used as a measuring instrument. Measurement was performed at a maximum curvature of ⁇ 0.5 cm ⁇ 1 and a curvature deformation rate of 0.5 cm ⁇ 1 / sec (constant), and the clamp width was 40 mm and the sample width was 25 mm. The measurement was performed under the conditions of a temperature of 20 ° C. and a humidity of 65%.
- KES-FB1-AUTO-A (trade name) was used as a measuring instrument. Measurement was performed with a maximum shear shear amount ⁇ tan 8 ° and a shear shear rate of 0.5 ° / sec. The clamp width was 5 cm and the sample width was 20 cm. The measurement was performed under the conditions of a temperature of 20 ° C. and a humidity of 65%.
- the bending moment of the absorbent body according to the present invention shows a value close to that of underwear, fits flexibly to various human body shapes, and has a very good human body It can be seen that compatibility is ensured. Further, in comparison with the conventional product (comparative example), the one using the absorbent according to the present invention (example) generated only a shear stress close to that of underwear. Therefore, according to the absorbent body of the present invention, the absorbent body is deformed in good conformity with the movement of the human body, extremely high followability is exhibited, and it does not give a sense of incongruity even when various operations are performed. I understand.
- An absorbent body test body shown in FIG. 10A was produced (the absorbent material 6 is omitted in FIG. 3). As shown in the drawing, a pulp / superabsorbent polymer mixture (200/50 g / m 2 ) shaped into a truncated pyramid shape was used as the absorbent portion, and a nonwoven fabric having a width of 200 mm and a width of 100 mm was used as the base sheet. .
- FIG. 10 The absorber was fixed to the base sheet using ultrasonic embossing (radius 1.0 mm).
- An unmolded absorbent material made of the same material as that in the space was spread between the absorbent parts and laid between the absorbent parts.
- the ratio (basis weight ratio) between the basis weight of the absorbing portion and the basis weight of the absorbent material can be determined by the following procedure. 1.
- the ratio (basis weight ratio) between the weight of the absorber and the weight of the absorbent material is: ⁇ (Basis weight of the absorbent material in the space between the absorbent parts) / (basis weight of the absorbent part) ⁇ ⁇ 100 (%) Calculate the ratio at.
- KES-FBS-L (trade name) was used as a measuring instrument. Measurement was performed at a maximum curvature of ⁇ 0.5 cm ⁇ 1 and a curvature deformation rate of 0.5 cm ⁇ 1 / sec (constant), and the clamp width was 40 mm and the sample width was 25 mm. The measurement was performed under the conditions of a temperature of 20 ° C. and a humidity of 65%.
- Absorber ratio Percentage of the value obtained by dividing the area occupied by the absorber in plan view by the area of the entire absorber.
- Basis weight ratio Percentage of the value obtained by dividing the basis weight of the absorbent material between the absorbent parts (space) by the basis weight of the absorbent part.
- both the MD direction and the CD direction showed high bending rigidity.
- the bending rigidity was significantly reduced in both the MD direction and the CD direction. Therefore, according to the absorbent body of the present invention, the absorbent body is deformed in a good manner corresponding to the movement of the human body, extremely high followability is exhibited, and it does not give a sense of incongruity even when various operations are performed. I understand.
- FIG. 10B is a schematic plan view showing a state in which the absorbent body test body 202 is extended in the length direction.
- the elongation ratio in the longitudinal direction was 30%, and the contraction ratio in the width direction was 14%.
- the transfer of liquid between adjacent absorbent parts 3 is effective in the vertical and horizontal directions between the absorbent parts as indicated by arrows f and h. It was confirmed that
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Abstract
Description
[第1実施形態]
図1は本発明の第1実施形態に係る吸収体を用いた吸収性物品(生理用ナプキン)100の一部分裁断した斜視図であり、図2は図1のII-II線に沿った断面図である。本実施形態の吸収体10は伸縮性のある基盤シート2の表面(上面)に多数のそれぞれ独立した吸収部3が自然状態において互いに対して所定の隙間d,eを有するように縦横方向に配設されている。この吸収部3は、平面視において長方形状であり、断面において横長台形の、面にやや丸みを帯びた切頭四角錐体(角錐台)形状のものとされているが、本実施形態においてこの形状は特に限定されず任意の形状のものを採用可能である。本実施形態において吸収部3はパルプ繊維と超吸収性ポリマーとから構成されており、その輪郭は図示したもののように定形的なものではなくてもよく、全体として上述した立体形状のものとされていることが好ましい。
これに対し本実施形態の吸収体を適用した生理用ナプキンであれば、おしりの丸みに緩やかに湾曲して適合しながら臀裂にも適度に入り込んで沿う、いわゆる鞍面形状ないし双曲放物線面状に変形して、殿裂にもほぼ隙間を与えずにフィットする。これにより、排泄ポイント近傍からおしりにまでかけてほぼ隙間なく当接する極めて良好な適合性が実現される。そして、着用者が寝返りをうったり歩行したりしたときにも肌面の動きに合わせて追従するため、隙間が開かず良好なフィット性が持続される。
また、本実施形態の生理用ナプキンは形態の復元性が極めて高いため、例えば個別包装時に3つ折等にして畳まれていても、それによる折り目が残りにくく、着用初期から上記の良好な身体適合性と追従性が得られる。
伸縮率=回復伸び/最大伸び長さ(=50mm) (1)
ここで、回復伸びは、最大伸び長さ(=50mm)からチャックを下降させて、初めて荷重ゼロを記録したときの、最大伸び長さからのチャック移動距離で定義される。なお、測定片が前述の大きさに満たない場合、下記方法で測定する。
<試験片> シートのチャック間方向の長さをLmm、把持部分の長さをSmm、幅をCmmとすると、長さの比;L:C=3:5になるように、試験片(L+2S)mm×Cmmの大きさに裁断し測定片を採取する。
<試験> 引張圧縮試験機に、チャック間距離Lで試験片をセットし、100×(L/30)mm/分、測定片が初期試料長の50%伸張するまで上昇。その後チャックの移動方向を逆転させ、チャックを100×(L/30)mm/分の速度で下降させ、初期試料長の位置まで戻す。下記式(2)で計算する。
伸縮率=回復伸び/最大伸び長さ(=L/2mm) (2)
以下、上記第1実施形態と重複する部分は省略し、本発明の第2実施形態ついて説明する。なお、上記第1実施形態と本第2実施形態とは独立かつ排他的な関係にあるものではなく、例えば上記第1実施形態の下位概念に包含されるものとして第2実施形態を位置づけることができる。また、第1実施形態に係る発明と第2実施形態に係る発明は同一又は対応する特別な技術的特徴に基づき単一の発明概念を形成し連関している技術的関係にある。図面中の符号については、対応する部材等については同じ符号を用いる(ただし、寸法や詳細な位置関係はそれぞれの実施形態に対応する図面に従う。)
図11(c)は、また別の例の表面シートであり、その表面側の面と裏面側の面とにおいて表面側面に使用する繊維の太さを太くすることによって、繊維自体の回復性や繊維同士の結合部における剛性を高める構造を有している。特に、結合部における剛性を高めると、吸収体との組合せにおいて、空間Qによる表面シートの部分的な嵩維持あるいは低圧縮部分により圧縮された部分に嵩回復を促すような網目構造(圧縮による歪を復元できる強い結合)が形成されていることが、より高い効果の発現がなされる。
(1)凸部を形成している凹凸構造、特に独立凸部[図11(a)]
(2)高い厚み配向性(表面側面から裏面側面への配向性)を持つ構成繊維[図11(b)]
(3)平均繊維間距離が裏面側より表面側が大きい[図11(c)]
<1>吸収部の密度(D3)
密度は、重量(g)を容積(cm3)で除することで得られるため、吸収部の重量と容積を計測する。重量は、5cm×5cmの大きさに切り出し計測する。(3ヶ所もしくは吸収性物品3枚より得られた値を算術平均した値をサンプルの重量とする。)容積は、重量を計測したサンプルを使用し、キーエンス製高精度形状測定システムKS-1100(商品名)及びKS-Analyzer(商品名)を用いる。測定時のKS-1100設定は、測定開始位置(X=0、Y=0)、測定範囲(X=40000μm、Y=40000μm)、測定ピッチ(X=20μm、Y=20μm)、移動速度7500μmとした。KS-Analyzerは、測定データを「補正」メニューより補正し用いる。補正の設定は、サイズ3×3、実行回数1、度合い100でおこなった。次いで「計測」メニューの全領域で計測し(従って計測範囲は4cm×4cm)、切り出した3サンプルの平均値を体積として得られた重量と体積より密度を得る。断面形状が台形や半円等、上面から形状を把握できる場合は、サンプルを設置する台をベースライン(0値)とするが、断面が六角形(図12(c))等、上面からのみで計測できない場合は、上下面より計測する際ベースラインを適宜設定したり、個々の吸収部を計測した合計値を用いる等により適切な容積値を得る。
なお、吸収部の輪郭部分が製造時に解れることがあり、そうすると該部分がやや不定形になったり、吸収性素材との区分があいまいになったりする。そのようなときには、後述する<3>吸収性素材の繊維密度(D6)記載の処理を行って計測する。
<2>表面シートの繊維密度(D1)
平坦な表面シートであれば、重量と測定サイズ及びKES-G5ハンディ圧縮試験機の計測によるT0を厚みとして、重量と体積より密度を計測できるが、凹凸構造を有する場合、上記<1>と同様に重量及び容積を計測して、表面シートの密度(D1)を算出する。
なお、表面シートと吸収部との間に中間シート等の中間部材がある場合には、この中間部材を含めた表面シート側部材の平均密度を上記密度(D1)とする。
<3>吸収性素材の密度(D6)
吸収性素材の密度D6の算出は、上記吸収部の計測前におこなう。計測サンプルサイズを5cm×5cm切り出して重量を計測してから、キーエンス製高精度形状測定システムKS-1100及びKS-Analyzerによる容積測定の後、上記吸収部間の吸収性素材を取り除いたサンプルの重量と容積計測することによって、元の重量及び容積から吸収部の重量及び容積を差し引くことによって、吸収性素材の重量及び容積が得られ、密度D6が算出できる。吸収部間の吸収性素材は、ピンセット等による取り除きが好ましい。風力等による外力では、吸収部の表面が乱れて吸収性素材との区別ができなくなることを防ぐためであり、繊維等が空気で運ばれ堆積されて形成されているため、ピンセットによる除去によって吸収部の表面が剥離することは通常起こりえない。
吸収部の輪郭部分が製造時に解れることがあり、そうする該部分がやや不定形になったり、吸収性素材との区分があいまいになったりする。そのようなときには、重量及び容積の計測の後、ピンセットによる除去を試み、解れた部分だけが取り出せた場合には吸収性素材として扱い、吸収部の重量及び体積を再計測する。
上述のように、折り畳まれた個別包装や個々の吸収性物品が重ねられたパッケージ形態では、通常、吸収性物品の厚み方向に圧力が加わった状態が続く。このため、表面シートや吸収体の厚みが潰され、表面シートでは特に嵩高性の減少によって液の通過しやすい空間が潰される。そうすると、液の通過抵抗性が増し表面シートにおける液の残留が著しく高まる。これに対し本実施形態によれば、個別包装やパッケージ形態であっても、吸収体に表面シートの一部を収容可能な空間が形成されていることで、表面シートに圧力が加わりにくく、液の通過性が損なわれにくい安定した着用性能が実現できる。
図7(a)に示した形態の吸収体試験体を作製した(ただし、各部位の寸法は図3に示した符号に基づいて記載する。)。吸収部としてはパルプ/高吸収性ポリマー混合体(200/50g/m2)を用い、基盤シートとしてはスチレンエチレンプロピレン共重合体(SEPS、13g/m2)不織布を用いた。吸収部のサイズは横幅T=6.0m、縦幅S=13.5mmとし、ピッチP2=7.5mm、隙間d=1.5mm、e=1.0mmで配置した。吸収部は超音波エンボス(半径1.0mm)を用いて基盤シートに固定した。
測定機器としてカトーテック株式会社 KES-FBS-L(商品名)を用いた。最大曲率±0.5cm-1、曲率変形速度0.5cm-1/sec(一定)で測定を行い、クランプ幅は40mm、サンプル幅は25mmとした。なお、測定は温度20℃、湿度65%条件下で行った。
測定機器としてカトーテック株式会社 KES―FB1―AUTO-A(商品名)を用いた。最大せん断ずり量±tan8°、せん断ずり速度0.5°/sec、で測定を行い、クランプ幅5cm、サンプル幅20cmとした。なお、測定は温度20℃、湿度65%条件下で行った。
図10(a)に示した吸収体試験体を作製した(なお図3では吸収素材6を省略している。)。吸収部としては図示したように角錐台形状に賦型されたパルプ/高吸収性ポリマー混合体(200/50g/m2)を用い、基盤シートとしては横幅200mm、縦幅100mmの不織布を用いた。吸収部のサイズは横幅T=6.5mm、縦幅S=13mmとし、ピッチP2=7.5mm、隙間d=1.5mm、e=1.0mmで配置した(各寸法の符号は図8、図10参照)。吸収部は超音波エンボス(半径1.0mm)を用いて基盤シートに固定した。吸収部の間に広がる空間にはこれと同じ材料からなる賦型されていない吸収性素材を空気搬送して吸収部の間に敷設した。吸収部の坪量と吸収素材の坪量との比率(坪量比)は以下の手順によって求めることができる。
1.吸収体全体の坪量を測定(吸収部(角錐台形状)+不織布+吸収部の間の空間の吸収材料)する。
2.不織布を含んだ状態で吸収部を角錐台形状の形状で10個任意に切り取り、その坪量を測定し平均値をもとめる。その後、あらかじめ測定しておいた不織布の坪量を引いて、吸収部の坪量とする。
3.吸収部の間の空間の吸収材料の坪量=全体の坪量-不織布の坪量-吸収部の坪量にて、吸収部の間の空間の吸収材料の坪量を算出する。
4.吸収部の坪量と吸収素材の坪量との比率(坪量比)は、
{(吸収部の間の空間の吸収材料の坪量)/(吸収部の坪量)}×100(%)
にて比率を算出する。
測定機器としてカトーテック株式会社 KES-FBS-L(商品名)を用いた。最大曲率±0.5cm-1、曲率変形速度0.5cm-1/sec(一定)で測定を行い、クランプ幅は40mm、サンプル幅は25mmとした。なお、測定は温度20℃、湿度65%条件下で行った。
2 基盤シート
3 吸収部
4 固定部
6 吸収性素材
6a パルプ繊維
6b 超吸収性ポリマーのビーズ
7 裏面シート
8 サイドシート
9 中間シート
10 吸収体
11 溝
100、200、300 吸収性物品
Claims (11)
- 複数の吸収部が互いに離間して、基盤シートに固定部を介して接合され、該固定部は平面視において前記吸収部の領域に包含されており、前記複数の吸収部は互いに液体連通化しうる状態に配列された吸収体。
- 前記吸収部の間には吸収性素材が配設されており、該吸収性素材の坪量は、前記吸収部の坪量よりも小さい吸収体。
- 前記基盤シートは伸縮性のシートであり、前記固定部の部位では伸縮性を発現していない請求項1に記載の吸収体。
- 前記吸収部は平面視で上面と前記基盤シートに接する側の下面との面積が異なっている請求項1~3のいずれか1項に記載の吸収体。
- 前記吸収部は平面視で矩形である請求項1~4のいずれか1項に記載の吸収体。
- 前記吸収部は平面視で括れのある多角形の形状を有する請求項1~5のいずれか1項に記載の吸収体。
- 前記吸収部間には平面視において前記基盤シートが底面となる空間が形成されている請求項1~6のいずれか1項に記載の吸収体。
- 前記複数の吸収部が前記基盤の片面側に配列されている請求項1~7のいずれか1項に記載の吸収体。
- 前記吸収性素材を前記吸収部を構成する材料と同じものとした請求項2~8のいずれか1項に記載の吸収体。
- 前記吸収部間には平面視において前記基盤シートが底面となる空間が形成されており、該空間に前記吸収性素材が配設された請求項1~9のいずれか1項に記載の吸収体。
- 請求項1~10のいずれか1項に記載の吸収体を備えた吸収性物品。
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KR20140022880A (ko) | 2011-05-27 | 2014-02-25 | 카오카부시키가이샤 | 흡수성 물품 |
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KR101894122B1 (ko) | 2011-05-27 | 2018-08-31 | 카오카부시키가이샤 | 흡수성 물품 |
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JP2014097241A (ja) * | 2012-11-15 | 2014-05-29 | Kao Corp | 吸収性物品 |
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JP2016067897A (ja) * | 2014-09-30 | 2016-05-09 | 花王株式会社 | 吸収性物品 |
CN106726156A (zh) * | 2016-12-30 | 2017-05-31 | 广东恒实业有限公司 | 一种纸尿裤芯体及其制作方法 |
Also Published As
Publication number | Publication date |
---|---|
EP2433602A4 (en) | 2013-08-28 |
TWI507178B (zh) | 2015-11-11 |
EP2433602B1 (en) | 2016-08-17 |
TW201103506A (en) | 2011-02-01 |
CN102427790B (zh) | 2016-01-06 |
RU2555615C2 (ru) | 2015-07-10 |
MY167152A (en) | 2018-08-13 |
RU2011151996A (ru) | 2013-06-27 |
CN102427790A (zh) | 2012-04-25 |
EP2433602A1 (en) | 2012-03-28 |
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