WO2021193229A1 - 使い捨て着用物品 - Google Patents
使い捨て着用物品 Download PDFInfo
- Publication number
- WO2021193229A1 WO2021193229A1 PCT/JP2021/010575 JP2021010575W WO2021193229A1 WO 2021193229 A1 WO2021193229 A1 WO 2021193229A1 JP 2021010575 W JP2021010575 W JP 2021010575W WO 2021193229 A1 WO2021193229 A1 WO 2021193229A1
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- WO
- WIPO (PCT)
- Prior art keywords
- lotion
- woven fabric
- hydrophilic
- sheet
- top sheet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
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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
- A61F13/51—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
- A61F13/51113—Topsheet, i.e. the permeable cover or layer facing the skin comprising an additive, e.g. lotion or odour control
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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
- A61F13/51—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
- A61F13/51121—Topsheet, i.e. the permeable cover or layer facing the skin characterised by the material
-
- 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
- A61F13/51113—Topsheet, i.e. the permeable cover or layer facing the skin comprising an additive, e.g. lotion or odour control
- A61F2013/51117—Topsheet, i.e. the permeable cover or layer facing the skin comprising an additive, e.g. lotion or odour control the lotion having skin care 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
- A61F13/51—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
- A61F13/51121—Topsheet, i.e. the permeable cover or layer facing the skin characterised by the material
- A61F2013/51139—Topsheet, i.e. the permeable cover or layer facing the skin characterised by the material being woven or knitted fabrics
Definitions
- the present invention relates to disposable wear items such as disposable diapers or sanitary napkins.
- hydrophilic lotion it is also known to apply a hydrophilic lotion to a top sheet made of non-woven fabric to reduce friction (see Patent Document 2).
- the hydrophilic lotion is preferable because it can prevent a decrease in the hardness of the waxy substance and the liquid permeability.
- a hydrophilic lotion containing water is preferred to prevent the skin from drying out.
- hydrophilic lotions containing water will lose their storage stability due to the growth of microorganisms.
- This problem can be solved by adding a preservative to the hydrophilic lotion, but it is desirable not to use the preservative because it causes rough skin depending on the wearer.
- the main problem of the present invention is to improve the storage stability when a hydrophilic lotion containing water is used without using a preservative.
- the disposable wearable articles that have solved the above problems are as follows. ⁇ First aspect> Has a topsheet that includes a skin contact area that comes into contact with the wearer's skin
- the top sheet is a non-woven fabric
- the skin contact region has a lotion-containing region containing a hydrophilic lotion containing water and glycerin.
- the lotion-containing region has a dimension of 30 mm or more in the MD direction and a dimension of 5 mm or more in the CD direction.
- the surface moisture content of the lotion-containing region is 3 to 10%.
- the hydrophilic lotion has a water activity value of 0.8 or less and The hydrophilic lotion does not contain preservatives, Disposable wear item characterized by that.
- This disposable wearable article is characterized in that when a hydrophilic lotion containing water is used, the water activity value of the hydrophilic lotion is kept low while containing glycerin to sufficiently secure the surface water content. Therefore, even if it does not contain a preservative, the growth of microorganisms is suppressed and the storage stability is improved. If the size of the lotion-containing region is too small, the friction reducing effect becomes local and there is little significance in protecting the wearer's skin.
- the top sheet is a short fiber non-woven fabric having a fineness of 1 to 3 dtex, a basis weight of 10 to 30 g / m 2 , and a thickness of 0.4 to 1.4 mm.
- Disposable wear article of the first aspect is a short fiber non-woven fabric having a fineness of 1 to 3 dtex, a basis weight of 10 to 30 g / m 2 , and a thickness of 0.4 to 1.4 mm.
- the short fiber non-woven fabric is a hydrophilic fiber non-woven fabric in which a hydrophilic agent is applied to a hydrophobic resin fiber.
- the disposable wear article of the second aspect is a hydrophilic fiber non-woven fabric in which a hydrophilic agent is applied to a hydrophobic resin fiber.
- the short-fiber non-woven fabric those using hydrophobic resin fibers are preferable because they are low in cost, but as they are, the holding property of the hydrophilic lotion containing water is poor. Therefore, in this case, it is preferable to use a short-fiber non-woven fabric of hydrophilized fibers using a hydrophilizing agent to enhance the retention of the hydrophilic lotion in the short-fiber non-woven fabric.
- the hydrophilic lotion has a viscosity of 150 to 400 mPa ⁇ s at a temperature of 20 ° C.
- the hydrophilic lotion contains 70 to 90% by weight of the glycerin and 10 to 30% by weight of water.
- the lotion-containing region has a hydrophilic lotion content of 5 to 15 g / m 2 per unit area.
- a disposable wearable article according to any one of the first to fourth aspects.
- composition of the hydrophilic lotion and the lotion content in the lotion-containing region can be appropriately determined, but are preferably within the range of this embodiment.
- FIG. 6-6 is a cross-sectional view taken along the line 6-6 of FIG. It is a 7-7 cross-sectional view of FIG. (A) 8-8 cross-sectional view of FIG. 1, (b) 9-9 cross-sectional view of FIG. 1, and (c) 10-10 cross-sectional view of FIG. It is a top view which shows various examples of the arrangement pattern of the hole of the perforated non-woven fabric. It is a top view which shows the example (Moroccan pattern) of the arrangement pattern of the hole of the perforated non-woven fabric.
- FIGS. 1 to 5 show tape-type disposable diapers as an example of disposable wear items.
- reference numeral X indicates the total width of the diaper excluding the connecting tape
- reference numeral Y indicates the total length of the diaper.
- the dotted pattern portion in the cross-sectional view shows an adhesive as a joining means for joining each constituent member.
- Known hot melt adhesives include slot coating, continuous linear or dotted bead coating, spiral, Z, wavy and other spray coating, and pattern coating (transfer of hot melt adhesive by letterpress method). It can be applied by the method. Instead of or in conjunction with this, at the fixed portion of the elastic member, a hot melt adhesive can be applied to the outer peripheral surface of the elastic member to fix the elastic member to the adjacent member.
- hot melt adhesive examples include EVA type, adhesive rubber type (elastomer type), olefin type, polyester / polyamide type and the like, but they can be used without particular limitation.
- a joining means for joining each component a means by material welding such as a heat seal or an ultrasonic seal can also be used.
- non-woven fabric in the following description, a known non-woven fabric can be appropriately used depending on the site and purpose.
- the constituent fibers of the non-woven fabric include olefin-based fibers such as polyethylene and polypropylene, polyester-based and polyamide-based synthetic fibers (including single-component fibers and composite fibers such as core sheaths), as well as recycled rayon and cupra. Fibers, natural fibers such as cotton, and the like can be selected without particular limitation, and these can be mixed and used. In order to increase the flexibility of the non-woven fabric, it is preferable that the constituent fibers are crimped fibers.
- the constituent fibers of the non-woven fabric include hydrophobic fibers or water-repellent fibers (including those made water-repellent by the water-repellent agent) even if they are hydrophilic fibers (including those made hydrophilic by the hydrophilic agent). ) May be.
- the non-woven fabric generally has a short fiber non-woven fabric, a long fiber non-woven fabric, a spunbond non-woven fabric, a melt blown non-woven fabric, a spunlace non-woven fabric, a thermal bond (air-through) non-woven fabric, and a needle punch depending on the fiber length, the sheet forming method, the fiber bonding method, and the laminated structure.
- Laminated non-woven fabric means that it is manufactured as an integral non-woven fabric including all layers and fiber-bonding processing is performed over all layers, and a plurality of separately manufactured non-woven fabrics are attached by a joining means such as a hot melt adhesive. Does not include combined items.
- This tape-type disposable diaper has a ventral portion F extending forward from the center of the anterior-posterior LD and a dorsal portion B extending posteriorly from the center of the anterior-posterior LD.
- the shape of this tape-type disposable diaper is separated from the crotch portion M extending from the front side of the center of the product in the front-rear direction to the rear side of the center of the front-rear direction of the product and the front side of the center of the front-rear direction of the product. It has a front wing 80 protruding to both left and right sides at a position, and a rear wing 81 protruding to both left and right sides at a position separated from the center in the front-rear direction of the product.
- the absorbent body 56 built in the range including the crotch part, the liquid permeable top sheet 30 covering the front side of the absorbent body 56, and the liquid permeable covering the back side of the absorbent body 56 are impervious. It has a sheet 11 and an exterior non-woven fabric 12 that covers the back side of the liquid-impermeable sheet 11 and constitutes the outer surface of the product.
- the absorber 56 is a portion that absorbs and retains the excrement liquid, and can be formed by an aggregate of fibers.
- the fiber aggregate is obtained by stacking short fibers such as cotton-like pulp and synthetic fibers, and by opening the tow (fiber bundle) of synthetic fibers such as cellulose acetate as necessary. Can also be used.
- the fiber basis weight can be, for example, about 100 to 300 g / m 2 when stacking cotton-like pulp or short fibers, and about 30 to 120 g / m 2 for filament aggregates, for example. Can be done.
- the fineness is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex.
- the planar shape of the absorber 56 can be appropriately determined, and can be a rectangular shape or a shape in which the middle of the LD in the front-rear direction is constricted along the circumference of the leg.
- the absorber 56 may contain highly absorbent polymer particles in part or all of it.
- the highly absorbent polymer particles include "powder” in addition to "particles".
- the particle size of the highly absorbent polymer particles is not particularly limited, but for example, sieving (shaking for 5 minutes) using a standard sieve (JIS Z8801-1: 2006) of 500 ⁇ m, and particles falling under the sieve by this sieving.
- the proportion of particles remaining on the 500 ⁇ m standard sieve is 30% by weight or less, and the 180 ⁇ m standard sieve. It is desirable that the proportion of particles remaining on the top is 60% by weight or more.
- the material of the highly absorbent polymer particles can be used without particular limitation, but a material having a water absorption of 40 g / g or more is preferable.
- Highly absorbent polymer particles include starch-based, cellulosic-based and synthetic polymer-based ones, which are starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and crosslinked sodium carboxymethyl cellulose.
- a substance or an acrylic acid (salt) polymer or the like can be used.
- As the shape of the highly absorbent polymer particles a powder or granular material that is usually used is preferable, but other shapes can also be used.
- the highly absorbent polymer particles those having a water absorption rate of 70 seconds or less, particularly 40 seconds or less, are preferably used. If the water absorption rate is too slow, so-called reversion, in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56, is likely to occur.
- the highly absorbent polymer particles those having a gel strength of 1000 Pa or more are preferably used. As a result, even when the bulky absorber 56 is used, the sticky feeling after liquid absorption can be effectively suppressed.
- the basis weight of the highly absorbent polymer particles can be appropriately determined according to the amount of absorption required for the application of the absorber 56. Therefore, although it cannot be said unconditionally, it can usually be set to 50 to 350 g / m 2 .
- the absorber 56 can be incorporated as an absorbent element 50 wrapped in a packaging sheet 58 in order to prevent the highly absorbent polymer particles from coming off or to improve the shape retention of the absorber 56.
- tissue paper particularly crepe paper, non-woven fabric, polylami non-woven fabric, a sheet having small holes, or the like can be used. However, it is desirable that the sheet does not allow the highly absorbent polymer particles to escape.
- a non-woven fabric is used instead of the crepe paper, a hydrophilic SMMS (spunbond / meltblown / meltblown / spunbond) non-woven fabric is particularly preferable, and polypropylene, polyethylene / polypropylene or the like can be used as the material.
- the fiber basis weight is preferably 5 to 40 g / m 2 , especially 10 to 30 g / m 2 .
- the packaging sheet 58 has a structure in which one sheet wraps the entire absorber 56, or a plurality of sheets such as two upper and lower sheets may wrap the entire absorber 56.
- the packaging sheet 58 may be omitted.
- the top sheet 30 extends from the front end to the rear end of the product in the front-rear direction and extends laterally from the absorber 56 in the width direction WD.
- the starting point of the rising gather 60 described later is more than the side edge of the absorber 56. If it is located on the center side of the WD in the width direction, or if necessary, the width of the top sheet 30 can be made shorter than the total width of the absorber 56, and the like can be appropriately deformed.
- the top sheet 30 has a skin contact area in contact with the wearer's skin, and is preferably a non-woven fabric from the viewpoint of liquid permeability and touch.
- Various non-woven fabrics can be used for the top sheet 30, but in consideration of cushioning properties, flexibility, permeability of loose stools (watery stools and muddy stools), etc., air through is better than long fiber (continuous fiber) non-woven fabrics.
- Short-fiber non-woven fabrics such as non-woven fabrics are preferable, and usually short-fiber non-woven fabrics having a fineness of 1 to 10 dtex, a grain size of 10 to 30 g / m 2 , and a thickness of about 0.4 to 1.4 mm are suitable.
- the fiber length of the short-fiber non-woven fabric is not particularly limited, but is preferably about 0.5 to 1.0 mm.
- the top sheet 30 is a perforated non-woven fabric having hole arrangement regions in which holes 14 penetrating the front and back surfaces are arranged in a predetermined pattern.
- the shape, dimensions, arrangement pattern, etc. of the holes 14 can be appropriately determined.
- the holes 14 are shown only in a part D of the top sheet 30, but this does not indicate the hole arrangement region.
- the hole arrangement region may be only the intermediate region of the front-rear direction LD in the top sheet 30 or only the intermediate region of the width direction WD in the top sheet 30 (there is a region having no hole 14 in a part). May be). Further, the hole arrangement region can be the entire top sheet 30. That is, as long as the hole arrangement region is provided in the skin contact region, it may extend to other regions (for example, regions to which the gather sheets 62 are adhered on both sides in the width direction WD).
- each hole 14 can be appropriately determined.
- the holes 14 have an elongated shape as shown in FIGS. 6 (a) and 6 (b), and have a perfect circular shape as shown in FIGS. 6 (c) (e) (f), 7 and 8 (FIG. 6). It can be any shape such as an ellipse, a triangle, a rectangle, a polygon such as a rhombus, a star shape, and a cloud shape as shown in d). Although not shown, holes 14 having different shapes may be mixed.
- the dimensions of the individual holes 14 are not particularly limited, but the dimensions in the front-rear direction (dimensions of the longest portion) 14L are preferably 0.5 to 2.0 mm, particularly 0.5 to 1.0 mm, and are preferably in the width direction.
- the dimension (dimension of the longest portion) 14W is preferably 0.5 to 2.0 mm, particularly 0.5 to 1.0 mm.
- shape of the hole 14 is long in the front-rear direction (a shape in which the total length in one direction is longer than the total length in the direction orthogonal to the total length in one direction) such as an elongated hole shape, an elliptical shape, a rectangle, a rhombus, etc. Is preferably 1.2 to 2.5 times the dimension in the width direction orthogonal to this.
- the longitudinal direction of the hole 14 is preferably the MD direction of the non-woven fabric, but it may be the CD direction or an oblique direction inclined with respect to these.
- the MD direction of the perforated non-woven fabric forming the top sheet 30 is equal to the LD in the front-rear direction.
- the area and area ratio of the holes 14 in the hole arrangement region may be appropriately determined, but the area is preferably about 0.25 to 4.00 mm 2 , and the area ratio is about 0.1 to 10%. preferable.
- the arrangement pattern of the holes 14 can be appropriately determined. For example, as shown in FIGS. 6A, 6C, and 6D, in the arrangement pattern of the holes 14, rows of holes 14 linearly arranged at predetermined intervals in the front-rear direction LD have a predetermined interval in the width direction WD. It is preferable that the matrix is vacant and repeated. In this case, as shown in FIGS. 6A and 6D, the arrangement is such that the distance between the front-rear LDs of the holes 14 14y is shorter than the distance 14x in the width direction WD of the holes 14, and the arrangement is shown in FIG. 6C.
- FIGS. 6A, 6B, and 6C rows 95 of holes linearly arranged in the front-rear direction LD at predetermined intervals are spaced in the width direction WD and the positions of the front-rear direction LD. It can be arranged so that they are arranged so as to be offset.
- FIGS. 6A and 6B is a so-called staggered (hexagonal lattice) arrangement in which the arrangement of the holes 14 is staggered in the rows of adjacent holes 95.
- the front-rear direction spacing 14y and the width direction spacing 14x of the holes 14 may be constant or variable, respectively. These can be appropriately determined, but for example, the anteroposterior distance 14y of the holes 14 can be 0.9 to 8.0 mm, particularly 1.0 to 3.0 mm, and the width direction distance 14x of the holes is 2.0. It can be up to 10 mm, especially 3.0 to 5.0 mm.
- the group 90 of the holes 14 arranged so as to form a single wavy 91 and 92 following the LD in the front-rear direction are arranged in the width direction WD. They can be arranged in the same phase or different phases at intervals.
- the wavy phases of the group 90 of the holes 14 adjacent to each other in the width direction WD are opposite to each other, and the virtual line connecting the holes 14 has a provoke pattern (standing pattern). be.
- the group 90 of the holes 14 arranged at intervals so as to form a chain following the LD in the front-rear direction can be arranged at intervals in the width direction WD.
- the group 90 of the holes 14 are lined up at intervals in the width direction WD means that there are no holes that are straight and continuous along the front-rear direction LD between the groups 90 of the holes 14 adjacent to the width direction WD.
- the cross-sectional shape of the hole 14 is not particularly limited.
- the hole 14 is a punched type hole whose peripheral edge is formed by a cut end of a fiber, there is almost no cut end of the fiber on the peripheral edge of the hole 14, and a pin is inserted between the fibers and expanded. It may be a non-punched type hole (high fiber density at the edge) formed in the above.
- the punched-type hole has a diameter of the hole 14 that becomes smaller toward the middle in the thickness direction, but is not shown, but becomes smaller toward one side in the thickness direction. You may.
- the non-punched type hole 14 becomes smaller as the diameter of the hole 14 increases from the pin insertion side to the opposite side. This includes those in which the diameter of the holes 14 continues to decrease over the entire thickness direction of the non-woven fabric layer, and those in which the decrease in the diameter of the holes 14 almost disappears in the middle of the thickness direction.
- fibers are extruded from the edge of the hole 14 on the side opposite to the pin insertion side to the side opposite to the pin insertion side.
- a portion (burr) 14e is formed and a protruding portion 14e is not formed on the pin insertion side, and as shown in FIG.
- fibers are pin-inserted at the edge of the hole 14 on the side opposite to the pin insertion side.
- a projecting portion 14e extruded to the opposite side to the side is formed, and a projecting portion 14e formed by extruding fibers to the pin insertion side is formed on the pin insertion side.
- the protruding portion 14e has a substantially uniform protruding height 14h, and as shown in FIG. 9C, the protruding portion 14e has a protrusion 14e.
- a facing portion having the highest protruding height 14i and a facing portion facing in a direction orthogonal to the facing portion having the lowest protruding height 14j are included.
- the protruding portion 14e has a cylindrical shape continuously in the circumferential direction of the hole, but the protruding portion 14e of a part or all of the hole 14 is formed only in a part of the circumferential direction of the hole 14. May be good.
- the protrusion heights 14h, 14i, 14j (apparent heights measured using an optical microscope without applying pressure) are preferably about 0.2 to 1.2 mm.
- the highest protruding height 14i in the protruding portion 14e is preferably about 1.1 to 1.4 times the lowest protruding height 14j.
- the protruding height of the protruding portion 14e may change in the circumferential direction of the hole 14.
- a protruding portion (burr) 14e is formed in which the protruding height 14i of the facing portion in the longitudinal direction of the hole 14 is higher than the protruding height 14j of the facing portion in the direction orthogonal to the longitudinal direction.
- the protruding portion 14e of the hole 14 may have a lower fiber density than the surrounding portion, but preferably has the same or higher fiber density.
- the perforated non-woven fabric has a fineness of 0.1 to 5.0 dtex (more preferably 1.0 to 3.0 dtex), a texture of 15 to 20 g / m 2 (more preferably 15 to 18 g / m 2 ), and a thickness of 0.
- a long fiber non-woven fabric of 3 to 0.8 mm more preferably 0.3 to 0.6 mm
- the protruding portion 14e formed at the edge of the hole 14 becomes low. ..
- the fibers are less likely to be extruded in the thickness direction when the pin insertion holes are formed.
- the fibers to which the force is applied by inserting the pin are continuous (continuous fibers) while being entangled throughout the non-woven fabric, and the movement of the fibers in the portion to which the force is applied by inserting the pin is suppressed by the portion connected to the outside. Is. Further, since the long-fiber non-woven fabric in the above-mentioned specific range basically has a moderately low fiber density, it is relatively easy to move the fibers in the direction orthogonal to the thickness direction.
- an intermediate sheet (also referred to as a "second sheet") 40 having a faster liquid permeation rate than the top sheet 30 can be provided.
- the intermediate sheet 40 is for quickly transferring the liquid to the absorber, enhancing the absorption performance by the absorber, and preventing the phenomenon of "reversion" of the absorbed liquid from the absorber.
- the intermediate sheet 40 may be omitted.
- a liquid-permeable sheet such as a non-woven fabric can be used.
- the intermediate sheet 40 is particularly preferable because the air-through non-woven fabric is bulky. It is preferable to use a composite fiber having a core-sheath structure for the air-through non-woven fabric.
- the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable.
- Basis weight is preferably 17 ⁇ 80g / m 2, 18 ⁇ 60g / m 2 is more preferable.
- the thickness of the raw material fiber of the non-woven fabric is preferably 2.0 to 10 dtex.
- eccentric fibers having no core in the center, hollow fibers, and eccentric and hollow fibers as mixed fibers of all or a part of the raw material fibers.
- the intermediate sheet 40 in the illustrated example is arranged in the center shorter than the width of the absorber 56, it may be provided over the entire width. Further, the intermediate sheet 40 may be provided over the entire length of the diaper, but may be provided only in the intermediate portion of the front-rear direction LD including the excretion position as shown in the illustrated example.
- the liquid-impermeable sheet 11 is not particularly limited, but is preferably one having moisture permeability.
- the liquid-impermeable sheet 11 is microporous obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, forming the sheet, and then stretching the sheet in the uniaxial or biaxial direction.
- the sheet can be preferably used.
- a non-woven fabric as a base material with improved waterproofness can also be used as the liquid-impermeable sheet 11.
- liquid-impermeable sheet 11 extends in the same or wider range as the absorber 56 in the front-rear direction LD and the width direction WD, but if necessary, such as when other impermeable means is present, it may be necessary. It is also possible to have a structure that does not cover the end portion of the absorber 56 in the front-rear direction LD and the width direction WD.
- the exterior non-woven fabric 12 covers the entire back side of the liquid-impermeable sheet 11 and gives the outer surface of the product a cloth-like appearance.
- the fiber basis weight of the exterior nonwoven fabric 12 is preferably 10 to 50 g / m 2 , particularly 15 to 30 g / m 2 , but is not limited thereto.
- the exterior non-woven fabric 12 can be omitted, in which case the liquid-impermeable sheet 11 can be extended to the side edge of the product.
- rising gathers 60 that stand up on the skin side of the wearer are provided on both sides of the surface widthwise WD. Is preferable. Of course, the rising gather 60 can be omitted.
- the rising gather 60 of the illustrated example is composed of a gather sheet 62 substantially continuous in the width direction WD and an elongated gather elastic member 63 fixed to the gather sheet 62 in an extended state along the front-rear direction LD. ing.
- a water-repellent non-woven fabric can be used as the gather sheet 62, and a rubber thread or the like can be used as the gather elastic member 63.
- a plurality of elastic members may be provided on each side, and only one elastic member may be provided on each side.
- the inner surface of the gather sheet 62 has a joint start end in the width direction on the side portion of the top sheet 30, and the outer portion in the width direction from the joint start end is the inner surface of each side flap SF, that is, liquid opaque in the illustrated example. It is bonded to the side portion of the sex sheet 11 and the side portion of the exterior nonwoven fabric 12 located outside in the width direction by a hot melt adhesive or the like.
- the central side in the width direction from the joint start end of the rising gather 60 is fixed on the top sheet 30 at both ends in the front-rear direction of the product, but the part between them is a non-fixed free part, and this freedom
- the portion rises due to the contraction force of the elastic member 63 and comes into close contact with the body surface.
- the tape-type disposable diapers of the illustrated example have a pair of end flaps EFs that do not have an absorber 56 and extend laterally to both the side edges of the absorber 56, respectively, extending to the anterior side and the posterior side of the absorber 56. It has a pair of side flap SFs that extend and do not have an absorber 56.
- the side flap SF may be formed of a main body sheet (exterior non-woven fabric 12 or the like) continuous from the portion having the absorber 56, or may be formed by attaching another material.
- a side elastic member 64 made of an elongated elastic member such as rubber thread is fixed to each side flap SF in a state of being extended along the front-rear direction LD, whereby the leg circumference portion of each side flap SF is flat. It is configured as a gather. As shown in the illustrated example, the side elastic member 64 is provided between the gather sheet 62 and the liquid impermeable sheet 11 on the outside of the joint portion of the gather sheet 62 in the width direction near the joint start end, and the side flap SF. It can also be provided between the liquid-impermeable sheet 11 and the exterior non-woven fabric 12 in the above.
- a plurality of side elastic members 64 may be provided on each side as shown in the illustrated example, or only one side elastic member 64 may be provided on each side. Of course, the side elastic member 64 (flat gather) can be omitted.
- the flat gather is a portion on which the contraction force of the side elastic member 64 acts (the portion in which the side elastic member 64 is shown). Therefore, in addition to the form in which the side elastic member 64 exists only in the flat gathered portion, the side elastic member 64 exists on the front side, the rear side, or both sides of the flat gathered portion, but the side elastic member 64 exists in other than the flat gathered portion. When the member is finely cut in one place or many places, is not fixed to the sheet sandwiching the side elastic member 64, or both, the contraction force acts on the parts other than the flat gather. It also includes a structure in which the contractile force of the side elastic member 64 acts only on the flat gathered portion (substantially equivalent to not providing the elastic member).
- This tape-type disposable diaper has front wings 80 protruding to both the left and right sides at a position separated from the center in the front-rear direction of the product.
- the front wing can be omitted (that is, the shape does not change from the narrowest part of the product to the front edge of the product).
- the dimension of the WD in the width direction of the front wing 80 can be appropriately determined, and can be, for example, 5 to 20% (particularly 7 to 15%) of the total length Y of the article.
- the dimension of the width direction WD of the front wing 80 can be substantially the same as the dimension of the width direction WD of the rear wing 81 described later.
- This tape-type disposable diaper has rear wings 81 protruding to both the left and right sides at a position separated from the center in the front-rear direction of the product.
- the width direction WD of the rear wing 81 can be appropriately determined, and can be the same as the width direction of the front wing 80, or can be smaller or larger than the width direction of the front wing 80.
- Both side edges of the product between the front wing 80 and the rear wing 81 are, for example, ⁇ 5 mm in the direction orthogonal to the center, centered on the direction in which the acute angle side crossing angle with respect to the anterior-posterior LD is less than ⁇ 2 degrees. It can have a substantially linear portion that passes through a range of widths. Both side edges of the product between the front wing 80 and the rear wing 81 may be wavy or arcuate (not shown) or linear as in the illustrated example.
- the rear wing 81 is passed from the lower edge of the front wing 80 to both side edges of the product between the front wing 80 and the rear wing 81.
- the entire concave edge leading to the lower edge can be formed.
- the laminated structure of the front wing 80 and the rear wing 81 is determined by the laminated structure of the side flap SF, and in the illustrated example, the front wing 80 and the rear wing 81 are formed by the gather sheet 62 and the exterior non-woven fabric 12.
- a front extension sheet that projects laterally from the side flap SF may be provided, and the entire front wing 80 or a part of the front end side may be formed by the front extension sheet.
- a rear extension sheet that projects laterally from the side flap SF may be provided, and the entire rear wing 81 or a part of the tip side may be formed by the rear extension sheet.
- Various non-woven fabrics can be used as the front extension sheet and the rear extension sheet.
- the rear wing 81 is provided with a connecting portion 13A that is detachably connected to the ventral portion F when worn. That is, when worn, both sides of the rear wing 81 are brought to the ventral side of the wearer, and the connecting portion 13A of the rear wing 81 is connected to the outer surface of the ventral portion F.
- a hook material male material
- a mechanical fastener hook-and-loop fastener
- the hook material has a large number of engaging protrusions on its connecting surface, and the shape of the engaging protrusions is a checkered shape, a J shape, a mushroom shape, a T shape, and a double J shape (J shape). Any known shape can be adopted, such as a shape in which objects are joined back to back.
- the connecting portion 13A can be directly attached to the rear wing 81, and as shown in the illustrated example, the connecting tape 13 having the connecting portion 13A can be attached to the rear wing 81.
- the structure of the connecting tape 13 is not particularly limited, but in the illustrated example, the width of the tape mounting portion 13C fixed to the side flap SF, the tape main body portion 13B protruding from the tape mounting portion 13C, and the tape main body portion 13B. It has a connecting portion 13A provided in the middle portion of the direction WD, and a portion on the tip end side of the connecting portion 13A is a knob portion.
- a non-woven fabric, a plastic film, a polylami non-woven fabric, paper, or a composite material thereof can be used as the sheet material forming the tape attachment portion 13C to the tape main body portion 13B.
- the connecting portion of the connecting portion 13A on the outer surface of the ventral side portion F can be appropriately determined, and only the main body portion located between the left and right front wings 80 may be the connecting portion, or the main body portion may be connected.
- the range from the side portion to the base end side of the front wing 80 may be the connecting portion.
- the connecting portion 13A can be easily connected.
- the connecting portion 13A is a hook material (male material) of a mechanical fastener (hook-and-loop fastener)
- the connecting portion on the outer surface of the ventral portion F may be formed of the loop material (female material) 20 of the mechanical fastener or a non-woven fabric. ..
- a plastic film in which loop threads are sewn is also known, but a long-fiber non-woven fabric in which the continuous direction of fibers is WD in the width direction (fineness 2.0 to 4.0 dtex, meshing 20 to 50 g / From the viewpoint of breathability and flexibility, it is preferable to provide a welded portion in which fibers are intermittently welded to each other at least in the width direction WD on (m 2, spunbonded non-woven fabric or the like having a thickness of about 0.3 to 0.5 mm).
- the hook material can be connected to the exterior nonwoven fabric 12 without adding anything.
- the loop material 20 may be attached only to the connecting portion on the outer surface of the ventral portion F.
- the connecting portion 13A is an adhesive layer
- a highly adhesive plastic film having a smooth surface can be attached to the connecting portion on the outer surface of the ventral portion F.
- the top sheet 30 is preferably adhered to a member on the back side arranged on the back side of the top sheet 30 via a hydrophobic hot melt adhesive 31.
- the top sheet 30 may be joined to the back side member arranged on the back side thereof by welding at least one of the top sheet 30 and the back side member arranged on the back side thereof.
- the top sheet 30 fixing region may extend to other regions (for example, the entire top sheet 30) as long as it covers at least the entire pore arrangement region, or may be only the pore arrangement region.
- the members on the back side are the intermediate sheet 40, the packaging sheet 58, and the liquid impermeable sheet 11, but the members are not limited thereto.
- EVA type As the hydrophobic hot melt adhesive 31, EVA type, olefin type, polyester / polyamide type and the like can be used, and in particular, an adhesive rubber type (elastomer type) can be preferably used.
- the amount of the hydrophobic hot melt adhesive 31 to be applied can be appropriately determined, but usually it can be about 0.1 to 10 g / m 2.
- the coating amount of the hydrophobic hot melt adhesive 31 is about 0.5 to 5 g / m 2, it is preferable because the hot melt adhesive 31 can be suppressed from protruding from the holes 14, but it is preferable to use a hydrophilic lotion described later. Adhesion inhibition is likely to occur, so it is desirable to combine it with a device for applying a hydrophilic lotion.
- the coating pattern of the hydrophobic hot-melt adhesive 31 can be appropriately determined, and a dense pattern (spray coating such as spiral, Z-shaped, wavy, etc.) in which minute non-coated portions are scattered is preferable, but slot coating is performed. It may be a continuous surface coating pattern such as.
- the skin contact region of the top sheet 30 has a lotion-containing region 32 containing a hydrophilic lotion containing water as shown in FIGS. 7, 10, and 11. If the size of the lotion-containing region is too small, the friction reducing effect becomes local and there is little significance in protecting the wearer's skin. Therefore, the lotion-containing region 32 is set in the MD direction of 30 mm or more (front and back in the illustrated example). It is preferable to have a dimension of 32 L in the direction LD) and a dimension of 32 W in the CD direction (width direction WD in the illustrated example) of 5 mm or more.
- the dimension 32L of the lotion-containing region 32 in the MD direction is more preferably 50 mm or more, and particularly preferably 100 mm or more.
- the upper limit of the dimension 32L of the lotion-containing region 32 in the MD direction is the overall length Y of the product, but it may be shorter than this.
- the dimension 32W of the lotion-containing region 32 in the CD direction is more preferably 10 mm or more.
- the upper limit of the dimension 32W in the CD direction of the lotion-containing region 32 is the dimension of the width direction WD of the top sheet 30, but it may be shorter than this.
- the lotion-containing region 32 may be provided in only one place in a large area to some extent, or may be provided in a plurality of places.
- the lotion-containing region 32 is preferably provided in a vertical stripe shape as shown in the illustrated example, but may be in a horizontal stripe shape.
- the distance 32X between the adjacent lotion-containing regions 32 can be appropriately determined, but is preferably about 1.5 to 10 mm, for example.
- the non-woven fabric of the top sheet 30 has a fineness of 1 to 3 dtex (more preferably 1.5 to 2.5 dtx), a basis weight of 10 to 30 g / m 2 (more preferably 15 to 25 g / m 2 ), and a thickness of 0.4. It is preferable to use a non-woven fabric having short fibers of about 1.4 mm (more preferably 0.5 to 1.0 mm). That is, in such a short fiber non-woven fabric, the fineness of the fiber contributes to the reduction of friction on the surface, and the friction reduction effect as a whole is improved in combination with the friction reduction effect of the hydrophilic lotion. In addition, the fine fibers also improve the retention of the hydrophilic lotion, which also improves the friction reducing effect. More specifically, it is preferable that the average friction coefficient MIU of the lotion-containing region in the top sheet 30 is 0.2 to 0.4 by the combination of the short fiber non-woven fabric and the hydrophilic lotion.
- the surface moisture content of the lotion-containing region 32 is not particularly limited, but is preferably 3 to 10%, particularly 4 to 8%, because it can appropriately moisturize the wearer's skin and prevent it from drying out. ..
- the composition of components other than water is not particularly limited.
- the components of the hydrophilic lotion other than water include glycerin, propylene glycol, dipropylene glycol, 1,3-butylene glycol, polyethylene glycol, sorbitol, xylitol, sodium pyrrolidone carboxylate, saccharides such as trehalose, and mucopolysaccharides.
- hyaluronic acid and its derivatives for example, hyaluronic acid and its derivatives, chondroitin and its derivatives, heparin and its derivatives, etc.
- elastin and its derivatives collagen and its derivatives, NMF-related substances, lactic acid, urea, higher fatty acids octyldodecyl, seaweed extract, silane roots.
- the additive may include one or more kinds of additives selected from the group of emulsifiers, phosphoric acid esters, paraffins and surfactants.
- the hydrophilic lotion may contain a preservative, but it is desirable that the hydrophilic lotion does not contain a preservative because it is transferred to the skin and moisturizes the skin. ..
- a particularly preferable hydrophilic lotion contains 70 to 90% by weight of glycerin and 10 to 30% by weight of water.
- a hydrophilic lotion containing mainly glycerin and an appropriate amount of water is not only preferable as a moisturizer when transferred to the skin, but also retains water as bound water in glycerin (glycerin has water retention). It is preferable because it is extremely expensive) and does not rot easily. That is, from such a viewpoint, when a hydrophilic lotion containing water is used, the water content of the hydrophilic lotion is maintained while containing a large amount of glycerin and ensuring a sufficient surface water content (for example, 3 to 10% as described above).
- the activity value is low, for example, 0.8 or less, more preferably 0.3 to 0.7, and particularly preferably 0.3 to 0.5, the growth of microorganisms is suppressed even if the preservative is not contained. Not only does it have good storage stability, but it also has a high moisturizing effect when it is transferred to the skin.
- the content of the hydrophilic lotion in the lotion-containing region 32 may be appropriately determined according to the purpose.
- the lotion-containing region 32 preferably has a content of 5 to 15 g / m 2 per unit area.
- the content of the hydrophilic lotion is the lotion containing region 32. whether the overall 2 ⁇ 20g / m 2, or a portion of the 5 ⁇ 15g / m 2 is at least 20% of the area of the lotion containing region 32, or is both preferred.
- the hydrophilic lotion preferably has a viscosity of 150 to 400 mPa ⁇ s at a temperature of 20 ° C. This preferably enhances the retention of the hydrophilic lotion in the short fiber non-woven fabric.
- the short fiber non-woven fabric one using hydrophobic resin fibers is preferable because it is low in cost, but as it is, the holding property of the hydrophilic lotion containing water is poor. Therefore, it is preferable to use a short fiber non-woven fabric of hydrophilized fibers in which a hydrophilic agent is applied to the fibers of the hydrophobic resin as the top sheet. This preferably enhances the retention of the hydrophilic lotion in the short fiber non-woven fabric.
- hydrophilizing agent in consideration of safety to the human body, safety in the process, etc., a nonionic activator to which ethylene oxide such as higher alcohol, higher fatty acid, alkylphenol, etc. is added, an alkyl phosphate ester salt (octyl) , Dodecyl type), anionic activators such as alkyl sulfates, etc. alone or in admixture, etc. are preferably used, and the amount to be applied varies depending on the required performance, but is usually 0.1 with respect to the dry weight of the target sheet. It is preferably about 2.0% by weight, particularly about 0.2 to 1.0% by weight.
- Samples 1 to 10 are non-woven fabrics to which a hydrophilic lotion is applied or not applied before being assembled into a product
- samples 11 to 15 are products in which a top sheet is removed from a commercially available product.
- the surface of each top sheet is patted in the front-back direction by hand to improve the smoothness and moist feeling in three stages compared to sample 5 ( ⁇ ... very good, ⁇ ... better than sample 5, x ... similar). Evaluated in.
- Samples 1 to 4 and 6 to 9 especially Sample Samples 1 to 4, 8 and 9, have a very smooth and moist surface on the top sheet. It has been found. Compared with these, the results of Samples 10 to 15 were inferior in smoothness and moist feeling. Although sample 9 was moist, it became sticky to the touch.
- the "front-back direction” means the direction indicated by the symbol LD in the figure (vertical direction), and the “width direction” means the direction indicated by the WD in the figure (horizontal direction), and the front-back direction and the width direction. Are orthogonal.
- -"MD direction” and “CD direction” mean the flow direction (MD direction) in the manufacturing equipment and the lateral direction (CD direction) orthogonal to this, and one of them is the front-back direction depending on the part of the product. And the other is in the width direction.
- the MD direction of the non-woven fabric is the direction of fiber orientation of the non-woven fabric.
- the fiber orientation is the direction along which the fibers of the non-woven fabric follow. It can be discriminated by a simple measuring method for determining the orientation direction.
- Front surface means the surface closer to the wearer's skin when worn
- back surface means the surface farther from the wearer's skin when worn
- -"Area ratio means the ratio of the target part to the unit area, and is expressed as a percentage by dividing the total area of the target part (for example, holes) in the target area (for example, cover non-woven fabric) by the area of the target area. Is. In a form in which a large number of target portions are provided at intervals, it is desirable to set the target area to a size that includes 10 or more target portions and obtain the area ratio.
- the area ratio of the holes can be measured by the following procedure using, for example, VHX-1000, which is a trade name of KEYENCE, and the measurement conditions are set to 20 times. (1) Set it on a 20x lens and adjust the focus. Adjust the position of the non-woven fabric so that there are 4x6 holes.
- Elongation rate means the value when the natural length is 100%. For example, an elongation rate of 200% is synonymous with an elongation ratio of 2 times.
- Methodsuke is measured as follows. After pre-drying the sample or test piece, leave it in a test room or device under standard conditions (test location: temperature 23 ⁇ 1 ° C., relative humidity 50 ⁇ 2%) to bring it to a constant weight. Pre-drying refers to constant weight of a sample or test piece in an environment at a temperature of 100 ° C. It is not necessary to pre-dry the fibers having an official moisture content of 0.0%. From the test piece in a constant amount, a sample having a size of 100 mm ⁇ 100 mm is cut out using a sampling template (100 mm ⁇ 100 mm). The weight of the sample is measured and multiplied by 100 to calculate the weight per square meter, which is used as the basis weight.
- the "thickness" is automatically measured using an automatic thickness measuring device (KES-G5 handy compression measurement program) under the conditions of a load of 0.098 N / cm 2 and a pressurized area of 2 cm 2.
- the thickness of the perforated non-woven fabric is measured at a portion other than the holes and the protruding portion around them.
- the water absorption rate shall be the "time to the end point" when JIS K7224-1996 "Water absorption rate test method for highly water-absorbent resin" was performed using 2 g of highly absorbent polymer and 50 g of physiological saline. ..
- Unfolded state means a state in which it is unfolded flat without shrinkage or slack.
- the dimensions of each part mean the dimensions in the unfolded state, not in the natural length state.
- the "maximum dimension" of the hole means the longer dimension of the MD direction dimension and the CD direction dimension.
- Average friction coefficient MIU and “average friction coefficient fluctuation deviation MMD” are measured using a friction tester KES-SE (10 mm square silicone sensor, load 50 g) manufactured by Kato Tech Co., Ltd., and the sensor movement distance. It means a value of 20 mm.
- the moving direction (friction direction) of the sensor is the MD direction of the top sheet.
- the top sheet 30 is cut along the side edge of the lotion-containing region 32 as shown in FIG. 12 (a). Then, a specimen 300 (narrower than the sensor 100) having only the lotion-containing region 32 was prepared, and the center of the sensor 100 was the center of the specimen 300 in the CD direction as shown in FIG. 12 (b). Measure according to. After each measurement, the hydrophilic lotion adhering to the surface of the sensor 100 is sufficiently wiped off before the next measurement is performed. If the lotion-containing region cannot be visually specified, the lotion-containing region can be specified by an appropriate method.
- a required number of specimens (for measurement and position identification) having the same position of the lotion-containing region 32 are prepared, and the lotion-containing region 32 in the top sheet 30 of the specimen for position identification is surrounded by an appropriate colorant.
- the same position as the coloring position specified in the position-specific specimen in the measurement specimen is the lotion-containing region 32.
- the measurement can be carried out as.
- the water leakage color developing agent "Moremir W" of Taseto Co., Ltd. can be preferably used.
- the lotion-containing region 32 can be specified by this method when measuring the dimension 32L in the MD direction and the dimension 32W in the CD direction of the lotion-containing region 32, and also in the measurement of the surface moisture content described later.
- the "surface moisture content” is an average value calculated by measuring any three locations in the lotion-containing region 32 using a moisture checker (MY-808S) manufactured by Scarar. After each measurement, the hydrophilic lotion adhering to the measurement surface of the moisture checker is sufficiently wiped off before the next measurement is performed.
- the "water activity value" can be measured by an electric resistance type water activity measuring device such as EZ-100ST (electric resistance type) manufactured by Freund Sangyo Co., Ltd. Calibrate with saturated solution before measurement.
- the measurement can be performed according to the electric resistance test based on the food hygiene inspection guideline. That is, a sample having a volume of 3% or more of the space volume in the detector of the water activity measuring device is collected, placed on an aluminum foil plate or an open flat plate, immediately placed in the detector and sealed, and 25 ⁇ 2 degrees.
- the numerical value is read at intervals of 10 minutes, and the time when the numerical value does not fluctuate is regarded as the equilibrium state of the water vapor pressure in the detector, and the numerical value at that time is used as the measured value of the sample.
- Each sample is measured three times, and the average value of the three measured values is taken as the water activity value.
- Viscosity is measured at a predetermined temperature using a Brookfield B type viscometer (spindle No. 027) according to JIS Z8803.
- test or measurement shall be performed in a test room or equipment under standard conditions (test location: temperature 23 ⁇ 1 ° C, relative humidity 50 ⁇ 2%). do.
- the present invention can be used for all disposable items such as pants-type disposable diapers, tape-type disposable diapers, pad-type disposable diapers, disposable swimwear, diaper covers, and sanitary napkins.
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Abstract
Description
<第1の態様>
装着者の肌に接する肌接触領域を含むトップシートを有し、
前記トップシートは不織布であり、
前記肌接触領域は、水及びグリセリンを含む親水性ローションが含有されたローション含有領域を有しており、
前記ローション含有領域は、30mm以上のMD方向の寸法、及び5mm以上のCD方向の寸法を有し、
前記ローション含有領域の表面水分率が3~10%であり、
前記親水性ローションの水分活性値が0.8以下であり、
前記親水性ローションは防腐剤を含有しない、
ことを特徴とする使い捨て着用物品。
本使い捨て着用物品は、水を含む親水性ローションを用いる場合において、グリセリンを含有させ、表面水分率を十分に確保しつつ、親水性ローションの水分活性値を低く抑えたところに特徴を有するものであり、防腐剤を含有せずとも微生物の繁殖が抑制され、保存性が良好となるものである。
なお、ローション含有領域の寸法が小さ過ぎると、摩擦軽減効果が局所的になり、着用者の肌を保護する意義が少ないものとなる。
前記トップシートは、繊度1~3dtex、目付け10~30g/m2、厚み0.4~1.4mmの短繊維不織布である、
第1の態様の使い捨て着用物品。
水を含む親水性ローションを短繊維不織布からなるトップシートに塗布した場合、製造後において親水性ローションが吸収体側に移行しやすく、予想よりもトップシートに親水性ローションが保持されにくいため、摩擦軽減効果が予想よりも低下することが考えられる。これに対して、本態様のように、親水性ローションと短繊維不織布のトップシートとの組合せにおいて、繊維の細い不織布を採用すると、繊維の細さが表面の摩擦軽減に寄与し、親水性ローションによる摩擦軽減効果と相まって、全体としての摩擦軽減効果が向上する。また、繊維が細いことにより親水性ローションの保持性も向上し、これによっても摩擦軽減効果が向上する。
前記短繊維不織布は、疎水性樹脂の繊維に親水化剤が塗布された親水化繊維の不織布である、
第2の態様の使い捨て着用物品。
短繊維不織布としては疎水性樹脂の繊維を用いたものが低コストであるため好ましいが、そのままでは、水を含む親水性ローションの保持性に乏しいものとなる。よって、この場合、親水化剤を用いた親水化繊維の短繊維不織布を用い、短繊維不織布における親水性ローションの保持性を高めることが好ましい。
前記親水性ローションの温度20℃での粘度が150~400mPa・sである、
第2又は3の態様の使い捨て着用物品。
短繊維不織布としては疎水性樹脂の繊維を用いたものが低コストであるため好ましいが、そのままでは、水を含む親水性ローションの保持性に乏しいものとなる。よって、親水性ローションの粘度を本態様の範囲内とし、短繊維不織布における親水性ローションの保持性を高めることが好ましい。
前記親水性ローションは、前記グリセリン70~90重量%、及び水10~30重量%を含むものであり、
前記ローション含有領域は、単位面積当たりの前記親水性ローションの含有量が5~15g/m2である、
第1~4のいずれか1つの態様の使い捨て着用物品。
親水性ローションの組成及びローション含有領域におけるローション含有量は適宜定めることができるが、本態様の範囲内であることが好ましい。
(吸収体)
吸収体56は、排泄液を吸収し、保持する部分であり、繊維の集合体により形成することができる。この繊維集合体としては、綿状パルプや合成繊維等の短繊維を積繊したものの他、セルロースアセテート等の合成繊維のトウ(繊維束)を必要に応じて開繊して得られるフィラメント集合体も使用できる。繊維目付けとしては、綿状パルプや短繊維を積繊する場合は、例えば100~300g/m2程度とすることができ、フィラメント集合体の場合は、例えば30~120g/m2程度とすることができる。合成繊維の場合の繊度は、例えば、1~16dtex、好ましくは1~10dtex、さらに好ましくは1~5dtexである。
吸収体56には、その一部又は全部に高吸収性ポリマー粒子を含有させることができる。高吸収性ポリマー粒子とは、「粒子」以外に「粉体」も含む。高吸収性ポリマー粒子としては、この種の吸収性物品に使用されるものをそのまま使用できる。高吸収性ポリマー粒子の粒径は特に限定されないが、例えば500μmの標準ふるい(JIS Z8801-1:2006)を用いたふるい分け(5分間の振とう)、及びこのふるい分けでふるい下に落下する粒子について180μmの標準ふるい(JIS Z8801-1:2006)を用いたふるい分け(5分間の振とう)を行ったときに、500μmの標準ふるい上に残る粒子の割合が30重量%以下で、180μmの標準ふるい上に残る粒子の割合が60重量%以上のものが望ましい。
高吸収性ポリマー粒子の抜け出しを防止するため、あるいは吸収体56の形状維持性を高めるために、吸収体56は包装シート58で包んでなる吸収要素50として内蔵させることができる。包装シート58としては、ティッシュペーパ、特にクレープ紙、不織布、ポリラミ不織布、小孔が開いたシート等を用いることができる。ただし、高吸収性ポリマー粒子が抜け出ないシートであるのが望ましい。クレープ紙に換えて不織布を使用する場合、親水性のSMMS(スパンボンド/メルトブローン/メルトブローン/スパンボンド)不織布が特に好適であり、その材質はポリプロピレン、ポリエチレン/ポリプロピレンなどを使用できる。繊維目付けは、5~40g/m2、特に10~30g/m2のものが望ましい。
トップシート30は、前後方向では製品前端から後端まで延び、幅方向WDでは吸収体56よりも側方に延びているが、例えば後述する起き上がりギャザー60の起点が吸収体56の側縁よりも幅方向WDの中央側に位置する場合等、必要に応じて、トップシート30の幅を吸収体56の全幅より短くする等、適宜の変形が可能である。
トップシート30を透過した液を速やかに吸収体へ移行させるために、トップシート30より液の透過速度が速い、中間シート(「セカンドシート」とも呼ばれている)40を設けることができる。この中間シート40は、液を速やかに吸収体へ移行させて吸収体による吸収性能を高め、吸収した液の吸収体からの「逆戻り」現象を防止するためのものである。中間シート40は省略することもできる。
液不透過性シート11は、特に限定されるものではないが、透湿性を有するものが好ましい。液不透過性シート11としては、例えば、ポリエチレンやポリプロピレン等のオレフィン系樹脂中に無機充填剤を混練して、シートを成形した後、一軸又は二軸方向に延伸して得られた微多孔性シートを好適に用いることができる。また、液不透過性シート11としては、不織布を基材として防水性を高めたものも用いることができる。
外装不織布12は液不透過性シート11の裏側全体を覆い、製品外面を布のような外観とするものである。外装不織布12の繊維目付けは10~50g/m2、特に15~30g/m2であると好ましいが、これに限定されるものではない。外装不織布12は省略することもでき、その場合には液不透過性シート11を製品の側縁まで延ばすことができる。
トップシート30上を伝わって横方向に移動する排泄物を阻止し、いわゆる横漏れを防止するために、表面の幅方向WDの両側には、装着者の肌側に立ち上がる起き上がりギャザー60が設けられていると好ましい。もちろん、起き上がりギャザー60は省略することもできる。
図示例のテープタイプ使い捨ておむつは、吸収体56の前側及び後側にそれぞれ延出する、吸収体56を有しない一対のエンドフラップEFと、吸収体56の両方の側縁よりも側方にそれぞれ延出する、吸収体56を有しない一対のサイドフラップSFとを有している。サイドフラップSFは、図示例のように、吸収体56を有する部分から連続する本体シート(外装不織布12等)からなるものであっても、他の素材を取り付けて形成してもよい。
各サイドフラップSFには、糸ゴム等の細長状弾性部材からなるサイド弾性部材64が前後方向LDに沿って伸長された状態で固定されており、これにより各サイドフラップSFの脚周り部分が平面ギャザーとして構成されている。サイド弾性部材64は、図示例のように、ギャザーシート62の接合部分のうち接合始端近傍の幅方向の外側において、ギャザーシート62と液不透過性シート11との間に設けるほか、サイドフラップSFにおける液不透過性シート11と外装不織布12との間に設けることもできる。サイド弾性部材64は、図示例のように各側で複数本設ける他、各側に1本のみ設けることもできる。もちろん、サイド弾性部材64(平面ギャザー)は省略することもできる。
本テープタイプ使い捨ておむつは、製品の前後方向の中央よりも前側に離れた位置で、左右両側に突出する前ウイング80を有している。前ウイングは省略する(つまり、製品の最も幅の狭い部分から製品の前端まで幅が変化しない形状とする)こともできる。
本テープタイプ使い捨ておむつは、製品の前後方向の中央よりも後側に離れた位置で、左右両側に突出する後ウイング81を有している。
前ウイング80と後ウイング81との間における製品の両方の側縁は、例えば、前後方向LDに対する鋭角側交差角が±2度未満の方向を中心として、当該中心と直交する方向に±5mmの幅の範囲を通るほぼ直線状の部分を有することができる。前ウイング80と後ウイング81との間における製品の両方の側縁は、波状や弧状をなしていてもよい(図示略)し、図示例のように直線状であってもよい。
図示例のように、サイドフラップSFの側部を凹状に切除することにより、前ウイング80の下縁から、前ウイング80と後ウイング81との間における製品の両方の側縁を経て後ウイング81の下縁に至る凹状縁の全体を形成することができる。この場合、サイドフラップSFの積層構造により前ウイング80及び後ウイング81の積層構造が決まり、図示例ではギャザーシート62及び外装不織布12により前ウイング80及び後ウイング81が形成される。図示しないが、サイドフラップSFから側方に突出する前延長シートを設け、前ウイング80の全体又は先端側の一部を前延長シートにより形成してもよい。同様に、サイドフラップSFから側方に突出する後延長シートを設け、後ウイング81の全体又は先端側の一部を後延長シートにより形成してもよい。前延長シート及び後延長シートとしては各種の不織布を用いることができる。
後ウイング81には、着用時に腹側部分Fと着脱可能に連結される連結部13Aを備えている。すなわち、着用に際しては、後ウイング81の両側部を装着者の腹側に持込み、後ウイング81の連結部13Aを腹側部分Fの外面に連結する。連結部13Aとしては、メカニカルファスナー(面ファスナー)のフック材(雄材)を設ける他、粘着剤層を設けてもよい。フック材は、その連結面に多数の係合突起を有するものであり、係合突起の形状としては、レ字状、J字状、マッシュルーム状、T字状、ダブルJ字状(J字状のものを背合わせに結合した形状のもの)等、公知のあらゆる形状を採用することができる。
トップシート30は、疎水性のホットメルト接着剤31を介して、トップシート30の裏側に配置された裏側の部材に接着されていると好ましい。これに代えて、又はこれとともに、トップシート30及びその裏側に配置された裏側の部材の少なくとも一方の溶着により、トップシート30がその裏側に配置された裏側の部材に接合されていてもよい。トップシート30固定領域は、少なくとも孔配列領域の全体にわたる限り、それ以外の領域まで(例えばトップシート30の全体)及んでいても、孔配列領域のみとなっていてもよい。裏側の部材は、図示例の場合、中間シート40、包装シート58、及び液不透過性シート11となっているが、これに限定されるものではない。
トップシート30の肌接触領域は、図7、図10、及び図11に示すように水を含む親水性ローションが含有されたローション含有領域32を有する。ローション含有領域の寸法が小さ過ぎると、摩擦軽減効果が局所的になり、着用者の肌を保護する意義が少ないものとなるため、ローション含有領域32は、30mm以上のMD方向(図示例では前後方向LD)の寸法32L、及び5mm以上のCD方向(図示例では幅方向WD)の寸法32Wを有していることが好ましい。ローション含有領域32のMD方向の寸法32Lは、50mm以上であるとより好ましく、100mm以上であると特に好ましい。ローション含有領域32のMD方向の寸法32Lの上限は製品全長Yであるが、これよりも短くてもよい。ローション含有領域32のCD方向の寸法32Wは、10mm以上であるとより好ましい。ローション含有領域32のCD方向の寸法32Wの上限はトップシート30の幅方向WDの寸法であるが、これよりも短くてもよい。
表1~3に示す各種のトップシートのサンプルについて、平均摩擦係数MIU、表面水分率、水分活性値等の各種特性を測定した。サンプル1~10は製品に組み立てる前の不織布に親水性ローションを塗布したもの又は塗布しなかったものであり、サンプル11~15は市販製品からトップシートを取り外したものである。また、各トップシートの表面を手で前後方向に撫でて、滑らかさ及びしっとり感を、サンプル5と比べて三段階(◎…非常に優れる、△…サンプル5よりは優れる、×…同程度)で評価した。
明細書中の以下の用語は、明細書中に特に記載が無い限り、以下の意味を有するものである。
(1)20倍のレンズにセットし、ピントを調節する。穴が4×6入るように不織布の位置を調整する。
(2)孔の領域の明るさを指定し、孔の面積を計測する。
(3)「計測・コメント」の「面積計測」の色抽出をクリックする。孔の部分をクリックする。
(4)「一括計測」をクリックし、「計測結果ウィンドを表示」にチェックを入れ、CSVデータで保存をする。
また、トップシートにおけるローション含有領域のCD方向の寸法がセンサの寸法(10mm)未満のときには、図12(a)に示すように、トップシート30をローション含有領域32の側縁に沿って切断して、ローション含有領域32のみの供試体300(センサ100よりも幅が狭い)を作成し、この供試体について図12(b)に示すようにセンサ100の中心を供試体300のCD方向の中心に合わせて測定を行う。なお、1回の測定の度に、センサ100の表面に付着した親水性ローションを十分に拭き取ってから次の測定を行う。
また、ローション含有領域を目視で特定できない場合、適宜の方法でローション含有領域を特定することができる。例えば、ローション含有領域32の位置が同一の供試体を必要数(測定用及び位置特定用)用意し、位置特定用の供試体のトップシート30におけるローション含有領域32を、適宜の着色剤で周囲と異なる色に着色し、着色位置を定規や適宜の画像測定装置を用いて特定した後、測定用の供試体において位置特定用の供試体で特定した着色位置と同一の位置をローション含有領域32として測定を実施することができる。ローション含有領域32を着色できるものとしては、株式会社タセトの水漏れ発色現像剤「モレミールW」を好適に用いることができる。ローション含有領域32のMD方向の寸法32L及びCD方向の寸法32Wを測定する場合、及び後述する表面水分率の測定等にも、この方法でローション含有領域32を特定することができる。
Claims (5)
- 装着者の肌に接する肌接触領域を含むトップシートを有し、
前記トップシートは不織布であり、
前記肌接触領域は、水及びグリセリンを含む親水性ローションが含有されたローション含有領域を有しており、
前記ローション含有領域は、30mm以上のMD方向の寸法、及び5mm以上のCD方向の寸法を有し、
前記ローション含有領域の表面水分率が3~10%であり、
前記親水性ローションの水分活性値が0.8以下であり、
前記親水性ローションは防腐剤を含有しない、
ことを特徴とする使い捨て着用物品。 - 前記トップシートは、繊度1~3dtex、目付け10~30g/m2、厚み0.4~1.4mmの短繊維不織布である、
請求項1記載の使い捨て着用物品。 - 前記短繊維不織布は、疎水性樹脂の繊維に親水化剤が塗布された親水化繊維の不織布である、
請求項2記載の使い捨て着用物品。 - 前記親水性ローションの温度20℃での粘度が150~400mPa・sである、
請求項2又は3記載の使い捨て着用物品。 - 前記親水性ローションは、前記グリセリン70~90重量%、及び水10~30重量%を含むものであり、
前記ローション含有領域は、単位面積当たりの前記親水性ローションの含有量が5~15g/m2である、
請求項1~4のいずれか1項に記載の使い捨て着用物品。
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| JP6488040B1 (ja) * | 2018-03-20 | 2019-03-20 | 大王製紙株式会社 | テープタイプ使い捨ておむつ |
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- 2021-03-16 CN CN202180012486.9A patent/CN115052571B/zh active Active
- 2021-03-16 US US17/801,457 patent/US12303368B2/en active Active
- 2021-03-16 JP JP2021042189A patent/JP7370354B2/ja active Active
- 2021-03-16 WO PCT/JP2021/010575 patent/WO2021193229A1/ja not_active Ceased
- 2021-03-23 TW TW110110305A patent/TW202139947A/zh unknown
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Also Published As
| Publication number | Publication date |
|---|---|
| TW202139947A (zh) | 2021-11-01 |
| JP2021154124A (ja) | 2021-10-07 |
| EP4088699A1 (en) | 2022-11-16 |
| CN115052571A (zh) | 2022-09-13 |
| KR20220159355A (ko) | 2022-12-02 |
| US20230089492A1 (en) | 2023-03-23 |
| EP4088699A4 (en) | 2024-01-24 |
| CN115052571B (zh) | 2023-11-03 |
| JP7370354B2 (ja) | 2023-10-27 |
| US12303368B2 (en) | 2025-05-20 |
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