WO2007114362A1 - 展開型吸収性物品および吸収性物品用裏面シートの製造方法 - Google Patents
展開型吸収性物品および吸収性物品用裏面シートの製造方法 Download PDFInfo
- Publication number
- WO2007114362A1 WO2007114362A1 PCT/JP2007/057182 JP2007057182W WO2007114362A1 WO 2007114362 A1 WO2007114362 A1 WO 2007114362A1 JP 2007057182 W JP2007057182 W JP 2007057182W WO 2007114362 A1 WO2007114362 A1 WO 2007114362A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sheet
- absorbent article
- hydrophobic
- hot melt
- nonwoven fabric
- Prior art date
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—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
- A61F13/56—Supporting or fastening means
- A61F13/62—Mechanical fastening means, ; Fabric strip fastener elements, e.g. hook and loop
- A61F13/622—Fabric strip fastener elements, e.g. hook and loop
Definitions
- Expandable absorbent article and method of manufacturing back sheet for absorbent article are provided.
- the present invention relates to a deployable absorbent article and a method for producing a back sheet for absorbent articles.
- An unfolded disposable diaper that is fastened to and worn on a fixed portion arranged in a predetermined position is well known.
- all or part of the fastening tape is formed of a male material that is the same as a hook-and-loop fastener, and a female material is adhered to a predetermined position of the ventral trunk in the width direction.
- a hook-and-loop fastener mechanism as a fastening mechanism in which a fastening portion is formed and the male material is pressed against and locked to a female material that is a fastening portion.
- the back sheet is formed of the nonwoven fabric sheet on the outer surface side.
- the embossing is performed across the width direction particularly on the ventral trunk of the back sheet. It is now possible to form a latching part on the back sheet itself, and a so-called target tapeless surface fastener mechanism in which a latching part is formed on the back sheet itself is commercially available. Being served! / Patent Document 1: JP-A-10-109371
- Patent Document 2 JP-A-7-285187
- Patent Document 3 JP-A-9 253130
- the embossing roll may be used when it is supplied to the embossing roll after being bonded with the hot melt adhesive at the time of manufacture. It has been found that hot melt adhesive melts due to the heat of the material and oozes out from the nonwoven fabric surface, causing both sheets to stick to the embossing roll and cause operational problems! .
- the main problem of the present invention is to prevent damage to the back sheet when the fastening tape is peeled off in a so-called target tapeless disposable diaper without impairing the texture and softness.
- Another problem is to prevent adhesion to the embossing roll caused by the hot melt adhesive during the production of the back sheet, thereby preventing operational troubles and lowering of the texture of the back sheet.
- Yet another challenge is to make it easier for the wearer to fasten at a certain position without having to redo, and to prevent the wearer from leaking.
- a fastening tape is disposed on the left and right side edges of either the back side or the abdominal side, and a part or all of the fastening tape is formed of a male material of a hook-and-loop fastener.
- the heel on the ventral side is a deployable absorbent article that is worn by being locked to a locking part arranged between the left and right side edges of the back side part,
- the back sheet is formed by laminating a hydrophobic sheet made of hydrophobic resin and a non-woven sheet constituting the outer surface of the article with a hot melt adhesive interposed therebetween and then thermocompression bonding.
- the adhesive strength between the hydrophobic sheet and the nonwoven sheet is higher than the peel strength when the male material is fixed to the nonwoven sheet, and the measured value in the KES bending test is 0.05 to 0.50 g'cm 2 Expandable absorbent article characterized by being / cm.
- the present invention provides the nonwoven fabric sheet with an adhesive strength between the hydrophobic sheet and the nonwoven fabric sheet. Since it is higher than the peel strength when the male material is fixed and then peeled off, no strong breakage occurs.
- the expandable absorbent article of the present invention has a texture and softness in the product because the measured value in the KES bending test of the back sheet is 0.05-5.50 g 'cm 2 Zcm. Also, there is a stiffness of the product, there will be no problems such as turning back when wearing
- the peel strength when the male material is fixed to the non-woven sheet is less than 200 gf, the tape may be detached when the product is mounted. On the other hand, if it is too high, if the peel strength when the male material is fixed to the nonwoven fabric sheet exceeds lOOOgf, the force required for attachment and detachment will increase, making the product extremely difficult to use.
- the adhesive strength between the hydrophobic sheet and the nonwoven fabric sheet is suitably 200 to 1000 gfZ25 mm.
- the amount of hot melt adhesive between each sheet 0.5 5-30. Is preferably a OgZm 2. If the amount used is strong, curing by hot melt can be prevented, and an absorbent article having a back sheet for absorbent articles with excellent texture can be obtained. In addition, when embossing is applied during the production of the back sheet, it is possible to prevent the hot melt adhesive from exuding and sticking to the embossing roll, which makes it easy to manufacture and throw away.
- the hydrophobic sheet and the nonwoven fabric sheet were thermocompression bonded while embossing so that the nonwoven fabric sheet side would be the convex roll side of the embossing roll.
- the hydrophobic sheet is less likely to adhere to the heated embossing roll, which greatly reduces the risk of operational troubles caused by rolling the embossing roll. As a result, it is possible to obtain an absorbent article having a back sheet for absorbent articles that is prevented from curing hot melt and has an excellent texture.
- a non-woven fabric made of hydrophobic resin is used as the separate member sheet, it is possible to obtain an absorbent article having a back sheet rich in variety, such as being bulky while ensuring softness.
- thermocompression bonding is performed only on the locking portion.
- thermocompression bonding When thermocompression bonding, the texture of the part decreases. By using only the locking part for thermocompression bonding, it is possible to obtain an absorbent article with excellent overall texture.
- the locking portion is composed of a pair of left and right locking portions, and the locking portions are spaced apart from each other at least in the center of the width direction of the product.
- the center part in the width direction that is wide from the center part in the width direction of the ventral trunk to the sides is rarely used for locking. . Therefore, by providing the separation portion at the center in the width direction of the locking portion, the range cured by thermocompression can be minimized, and the absorbent article having an excellent texture as a whole can be obtained.
- the conventional disposable diaper locking portion is provided wide from the center in the width direction of the abdominal trunk to both sides, the person performing the fastening (hereinafter, fastening) Can also be easily attached to the other fastening tape side by crossing over or over one of the fastening tapes. There are many cases where the fastening tape is stuck to such a central part.
- the wearer when the wearer is an infant, the wearer may move against the intention of the wearer. In other words, such a fastening mode may occur when the fastening operation is performed suddenly.
- the wearer when the wearer becomes the wearer himself / herself, he usually holds the fastening tape with one hand and the side flap with the other hand. In most cases, they try to pull the two together to lock them, and at this time, the side flaps on the side that is not held by the hand open and often locks near the center.
- the locking portion is composed of a pair of left and right locking portions, and the locking portion is arranged to be separated at least in the center in the width direction of the product.
- the male material is not sufficiently locked, the above-mentioned problems occur. Therefore, it becomes easier for the wearer to stop at a certain position without having to redo, and leakage of the wearer can be prevented.
- thermocompression bonding to the bulky portion of the separate member sheet, the unevenness difference of the thermocompression bonding portion is increased, and a locking portion having excellent engagement force can be obtained.
- the application pattern of the hot melt adhesive is a pattern in which a plurality of application lines continuous in the front-rear direction or the width direction of the article are provided at a predetermined interval, the width of the application line is 0.1 to 3 mm, and The force applied to an area of 90% or more of the hydrophobic sheet, or
- the application pattern of the hot melt adhesive is a pattern in which dot-like application points are provided in the form of dots, the area of the application point is 0.05 to 5 mm 2 , and the hydrophobic sheet 90 Applied to more than% area,
- the application pattern of the hot melt adhesive a linear or dotted pattern as described in this section is preferable because it is easy to produce.
- the texture of the product is improved.
- the liquid barrier sustainability tends to be insufficient, and if the line width or the dot area is too small, Regardless of the total application area and application amount, the liquid barrier sustainability tends to be insufficient, and if the line width or the dot area is too wide, the air permeability tends to deteriorate. Therefore, the range described in this section is preferable.
- “scattered” includes both regularly arranged and irregularly scattered.
- the force concentrates on the locking portion of the male material in the back sheet, and the back sheet may peel from the hydrophobic sheet due to in-layer peeling or delamination. .
- the fastening with the fastening tape is loosened or the fastening tape is released, and leakage occurs from the gaps around the stomach and legs.
- the invention described in this section has been made in view of such problems, and by making the hydrophobic sheet a non-woven fabric made of a hydrophobic resin, the interlayer strength of the sheet constituting the back sheet is increased, and the resistance is improved.
- the water pressure to 400 mmAq, body fluid can be prevented from being exposed.
- the hook element is suitably locked to the exterior sheet while maintaining flexibility and air permeability.
- the non-woven fabric used for the hydrophobic sheet is a single-layer non-woven fabric or a laminated non-woven fabric having a plurality of layers, and at least one layer is made of fiber fibers of less than 1.2 dtex, and the fiber basis weight is 15 to 25 gZm 2.
- the ultrafine or ultrafine fiber layer as described in this section has a very high liquid-insulating property per se, and is very suitable for ensuring the above-mentioned water pressure resistance.
- the laminated nonwoven fabric is very suitable because it has an advantage that the ultrafine fiber layer having low strength can be protected by other layers.
- the hydrophobic sheet and non-woven sheet are bonded using a hot-melt adhesive with a predetermined peel strength, the surface of the non-woven cloth is less likely to seep out of the adhesive, and the back surface has excellent adhesion to each sheet. A sheet is produced.
- thermocompression bonding is performed while embossing is performed at an embossing pressure of 3 to 20 kgfZcm 2 during the thermocompression bonding.
- both sheets can be securely crimped, and the back surface sheet has a particularly excellent texture.
- the invention's effect is 3 to 20 kgfZcm 2 , both sheets can be securely crimped, and the back surface sheet has a particularly excellent texture.
- the use of the target tape-less and the discarding of the fastening tape in the diaper can be prevented without damaging the texture and softness.
- adhesion to the embossing roll due to the hot melt adhesive during the production of the back sheet is prevented, preventing operational troubles and lowering of the texture of the back sheet.
- FIG. 1 is a plan view showing an unfolded state of the diaper of the first embodiment and showing an outer surface side force.
- FIG. 2 is a plan view showing an outer surface side force of the diaper in a second embodiment in a developed state.
- FIG. 3 is a plan view showing a preferred emboss pattern.
- FIG. 4 is a plan view showing another preferred emboss pattern.
- Fig. 5 is a plan view showing a developed state of the diaper of the third embodiment with the inner surface side force.
- FIG. 6 is a cross-sectional view taken along line 2-2 in FIG.
- FIG. 7 is a conceptual diagram of a back sheet.
- FIG. 8 is a plan view showing various application patterns.
- FIG. 9 is a plan view showing various application patterns.
- FIG. 10 is a plan view showing various application patterns.
- FIG. 11 is a cross-sectional view showing various male materials.
- FIG. 12 is a schematic diagram of an apparatus for producing a back sheet.
- FIG. 1 is a development view of a stationary use, abandonment, and a disposable diaper Z according to the present invention.
- This disposable diaper z includes a liquid-permeable top sheet 11 located on the user's skin side, a liquid-impermeable back sheet 12 located outside the product and substantially impermeable to liquid, and these For example, a rectangular or preferably an hourglass-shaped absorber 13 provided between them, and fastening tapes Yl, Y2 for fastening are arranged on the left and right side edges of the back side. Is.
- the fastening tapes Yl and Y2 are formed of a male material of a hook-and-loop fastener, and a locking portion X to which the exposed portion of the male material is locked is formed on the outer side of the back sheet 12. .
- the back sheet 12 has a substantially rectangular shape wider than the absorbent body 13, and the non-woven fabric sheet 12B for exterior is provided on the outer surface of the hydrophobic sheet 12A made of hydrophobic resin (non-polar resin) to improve the touch. They are stacked and bonded by thermocompression bonding.
- hydrophobic resin used for the hydrophobic sheet 12A polyolefins such as polyethylene (PE) or polypropylene (PP), polyethylene terephthalate (PET), polyesters, polyamides, polyurethanes, etc. are suitable. is there.
- the back sheet 12 includes a nonwoven fabric as the hydrophobic sheet 12A and a nonwoven fabric sheet for exterior 12B. Can also be formed by laminating and bonding.
- the thickness and rigidity of the water repellent sheet 12A may be appropriately selected according to known standards in consideration of the thickness and rigidity of the laminated nonwoven sheet.
- the nonwoven fabric can be basically the same as the exterior nonwoven fabric sheet 12B described later, but it is not necessary to use the same material. Etc. can be selected individually.
- non-woven fabric sheet 12B for exterior use a known non-woven fabric sheet used for the back sheet 12 of the absorbent article Z can be used.
- a known non-woven fabric sheet used for the back sheet 12 of the absorbent article Z can be used.
- PE polyethylene
- PP polypropylene
- PET polyethylene terephthalate
- Synthetic fibers such as olefinic, polyester, polyamide, and polyurethane, mixed fibers such as (PE) / (PET), recycled fibers such as rayon and cuvula, natural fibers such as cotton, etc.
- Non-woven fabric obtained by applying appropriate processing methods such as air-through method, point bond method, air through point method, spun lace method, spun bond method, thermal bond method, melt blown method, needle punch method, heat shrink method, etc.
- a cloth can be used.
- the spunlace method is flexible and draped. It is excellent in that it becomes rich, and the thermal bond method is excellent in that it becomes bulky and rich in software, and can be appropriately selected according to the purpose.
- the nonwoven fabric sheet may be a laminated nonwoven fabric sheet, for example, a spunbond nonwoven fabric (S) layer formed by a spunbond method; a meltblown nonwoven fabric layer (M) formed by a meltblown method ) Can be used as a raw material.
- the fineness of the fibers used in the nonwoven fabric sheet 12B is preferably about 1.8 to 3.0 decitex.
- the basis weight of the nonwoven fabric sheet 12B is 10 to: LOOgZm 2 , more preferably about 15 to 50 gZm 2 . If the basis weight of the nonwoven fabric sheet is too low, the space in which the male material is entangled will not be sufficiently maintained, and the nonwoven fabric sheet 12B will break when the fastening tapes Yl, Y21, Yl, Y22 are peeled off. This is not preferable because the productivity of 12B deteriorates, and the fastening tapes Yl, Y21, Yl, Y22 to the parts other than the locking part X become noticeable.
- the back sheet 12 is preferably configured to have a water vapor transmission rate of 0.5 to 4. OgZlOOcm r. It is preferable that the exterior nonwoven fabric sheet 12B has a dense fiber loop and fiber arch on the surface other than the locking portion and is not locked with the male material.
- An intermediate layer nonwoven fabric sheet 12C as another member sheet formed of a nonwoven fabric sheet is interposed between the sheets 12A and 12B in the ventral region including the locking portion X of the back sheet 12. .
- the intermediate nonwoven fabric sheet 12C By interposing the intermediate nonwoven fabric sheet 12C, the part becomes bulky, and the pressing tape Yl, Y21, Yl, Y22 becomes excellent in pressing feeling when pressed against the locking portions XI, X2, and The delamination strength is improved, and delamination of the exterior nonwoven fabric sheet 12B accompanying the peeling off of the fastening tapes Yl, Y21, Yl, Y22 is prevented.
- the intermediate layer nonwoven fabric sheet 12C basically the same as the nonwoven fabric sheet 12B for exterior use can be used, but it is not necessary to use the same material, and appropriate materials can be individually selected as necessary.
- the intermediate nonwoven fabric sheet 12C may be provided with a design or a picture that serves as an indication of the position at the time of fastening by printing or the like, and external force may be visible through the exterior nonwoven fabric sheet 12B.
- the intermediate nonwoven fabric sheet 12C may be provided with the same dimensions as the exterior nonwoven fabric sheet 12B.
- Hydrophobic sheet 12A and nonwoven sheet 12B at the intermediate portion of intermediate nonwoven sheet 12C Is desired to have a peel strength of 100 to 1500 gfZ25 mm, preferably 200 to 1000 gfZ25 mm.
- the peel strength can be measured using a tensile tester (AOUTGRAPHAGS-G100N manufactured by SHIMADZU).
- the measurement method is to prepare a sample cut to 25 mm x 130 mm, peel off 5 cm in advance in the longitudinal direction to form a tear-off port, and at 20 ° C, 50 mm between chucks and 300 mm Zmin. Then, measure the length of 30 mm from the above-mentioned peeling port with a tensile tester. Two types of samples, one with the longitudinal direction being the product vertical direction and one with the longitudinal direction being the product horizontal direction, are prepared, and the measured values are averaged to obtain the measured value.
- the back sheet 12 is manufactured according to the manufacturing method described later. That is, the hydrophobic sheet 12A and the nonwoven fabric sheets 12B and 12C are measured at 40 ° C in the loop test specified in JIS Z 0237. Each sheet is embossed with the outer nonwoven fabric sheet 12B side facing the convex roll side of the embossing roll in a laminated state where a hot melt adhesive having a peel strength of 0.0 to 5 mm is interposed. It is formed by laminating and bonding.
- the back sheet 12 has a KES bending measurement value of 0.05 to 0.50 g'cm 2 / cm, preferably S, and is preferably 0.1 to 0.45 g'cm 2 / cm. It is more preferable than force S, and more preferably 0.20 to 0.40 g-cm 2 / cm. If the measured value in the bending test of KES is 0.05 g-cmVcm or less, the product is too soft and the product will not be firm, causing problems such as turning back when installed. Conversely, if it exceeds 0.50 g'cm 2 / cm, the texture and softness of the product will be impaired.
- the KES bending measurement value in the present invention was measured using a pure bending tester (manufactured by Kato Tech Co., Ltd .: KES-FB-2AOUT-A) for a specimen cut into a length of 200 mm and a width of 200 mm. This is the value when bent with DFE sensitivity of 20 and curvature range of 0.0 to 0.5cm 1 .
- the locking portion X of the present embodiment has an appropriate embossing process for forming the locking portion over an appropriate range from the central portion in the width direction (belly circumference direction) of the back sheet 12 to both sides. In other words, it is a part of the outer surface of the back sheet 12.
- the embossing for forming the locking part is performed by using the manufactured back sheet 12 as the embossing protrusion for the locking part.
- the embossing device with a convex embossing roll formed with a pattern and a rubber roll with enough flexibility to push the convex part of the convex embossing roll opposite to the embossing roll so that the nonwoven fabric sheet side becomes the convex embossing roll side.
- An embossing device including a concave embossing roll in which a concave portion corresponding to the convex portion of the convex emboss roll is formed may be used.
- the locking portion X forms the locking portion X at the time of manufacturing the back sheet so that the embossing pattern on the embossing roll is different only in the portion corresponding to the locking portion when the back sheet 12 is manufactured. You can also
- the embossing depth and embossing density at that time are appropriately designed according to the basis weight of the nonwoven fabric sheet and the configuration of the male material.
- the embossing pattern to be applied as the locking portion is a force capable of adopting a known pattern performed with this type of target tapeless type, preferably along the MD direction or the CD direction when forming the back surface sheet. It is a pattern in which embosses are arranged. If it does in this way, it will become a pattern in which the embossing along a longitudinal direction or a width direction is usually arranged at the time of a product.
- the emboss pattern is a pattern in which the emboss is continuously or along the CD direction when the back sheet is formed. In this case, in particular, there will be less delamination due to peeling off of the fastening tape and less fluffing of the nonwoven fabric sheet.
- the locking portion X may cause tape detachment when the product is mounted, such as when the peel strength when the male material is fixed to the nonwoven fabric sheet is less than 200 gf. It is desirable that the locking portion X has a peel strength exceeding 200 gf when the male material is fixed to the nonwoven fabric sheet. Furthermore, if the peel strength when the male material is attached to the nonwoven fabric sheet exceeds lOOOgf, the force required for attachment / detachment increases, making the product extremely difficult to use. Therefore, the peel strength between the non-woven fabric sheet and the male material at the locking portion X is 100 to 1500 gfZ25 mm, preferably 200 to 1000 gf / 25 mm.
- the adhesive strength between the hydrophobic sheet 12A and the non-woven sheet 12B in the back sheet 12 is at least within the range of the locking part X so that delamination does not occur in the locking part X.
- the range of 100 ⁇ 1500gf Z25mm, preferably 200 ⁇ lOOOOgf / 25mm Therefore, it is desirable to set the value so as to be larger than the peel strength between the non-woven fabric sheet 12B and the male material at the locking portion X.
- the peel strength can be measured using a tensile tester (AOUTGRAPH AGS-G100N manufactured by SHIMADZU).
- the measurement method is to prepare a sample (back sheet) cut to 25mm XI 30mm, peel off 5cm in the longitudinal direction in advance to form a tear-off port, and at 20 ° C, 50mm between chucks, tensile speed Under the condition of 300 mmZmin, the above-mentioned peeling loca is also measured by peeling off a length of 30 mm with a tensile tester.
- the locking portion X may be formed by, for example, a needle punching process or the like without depending on the embossing carriage.
- a method for forming the locking portion X a known method can be appropriately employed without departing from the scope of the present invention.
- the portion where the locking portion X is formed has a three-layer structure in which the back sheet 12 is interposed with an intermediate non-woven sheet, and has high strength and an adhesive amount.
- the backsheet is less likely to be damaged due to repeated attachment and detachment of the fastening tape, which has a relatively large amount of adhesive strength compared to the other portions and the adhesive strength of each sheet is high.
- the top sheet 11 extends outward from the side edge 13s of the absorbent body 13 which is wider than the absorbent body 13, and the back sheet 12 and hot melt adhesive or the like are provided around the absorbent body 13 It is adhered by.
- the surface sheet 11 is made of various nonwoven fabrics such as spunbond nonwoven fabric, air-through nonwoven fabric, SSM nonwoven fabric, and point bond nonwoven fabric, as well as plastic film such as polyethylene film and plastic film and nonwoven fabric as long as liquid permeability can be secured. Nated laminated nonwoven fabrics can also be used.
- a net-like material in which yarns such as nylon and polyethylene terephthalate are plain woven can be used.
- the absorbent body 13 is formed by covering a fiber aggregate, which is also a piled pulp or tuka, with an absorbent polymer contained therein and covering it with a pulp sheet or the like.
- fibers constituting the fiber aggregate include polysaccharides or derivatives thereof (cellulose, cellulose ester, chitin, chitosan, etc.), synthetic polymers (polyethylene, polypropylene, polyamide, Polyester, polylactamamide, polyvinyl acetate, etc.) In particular, cellulose ester and cellulose are preferable.
- the superabsorbent polymer examples include carboxymethylcellulose, polyacrylic acid and its salts, crosslinked acrylate polymer, starch-acrylic acid graft copolymer, and starch-atari mouth-tolyl graft copolymer hydrolyzate.
- Cross-linked polyoxyethylene, cross-linked carboxymethyl cellulose, polyethylene oxide, polyacrylamide and other partially cross-linked polymers, or a copolymer of isoptylene and maleic acid are preferably used.
- those added with an anti-blocking agent can also be used.
- the superabsorbent polymers include various forms such as powders, particles, granules, pellets, sols, suspensions, gels, films, and non-wovens. ! And deviations can also be used in the present invention, and particles in particular are preferably used.
- the absorbent article of the present invention is not limited to this form.
- An elastic elastic member such as rubber thread used in a disposable diaper or the like can be provided in various places.
- a second sheet may be provided between the surface sheet and the absorber for the purpose of diffusing body fluids.
- the intermediate nonwoven fabric sheets 12C and Z or the thermocompression bonding part is preferable because it extends to the side edge in the product width direction at the flap part on the abdomen side, so that an appropriate waist is formed on the side flap and it is easy to attach. ,.
- FIG. 2 shows a stationary disposable diaper Z1 that can be applied to the second embodiment. Since the basic structure of the disposable diaper Z is the same as that of the first embodiment, the same parts are denoted by the same reference numerals and the description thereof is omitted.
- the locking portions XI and X2 it is desired to form the locking portions XI and X2 by appropriately embossing a part of the outer surface of the back sheet 12 without attaching the female material to the back sheet.
- This is also called a target tapeless.
- an intermediate nonwoven fabric sheet 12C is disposed between the exterior nonwoven fabric sheet 12B and the hydrophobic sheet 12A within a range including the range in which the locking portions XI and X2 are formed.
- Fastening fastening tapes Yl and Y2 arranged on the left and right side edges of the back side are bonded to the left and right side edges, and formed of a male material of a hook-and-loop fastener (not shown) except for the part. And this The left side fastening tape XI and the left side fastening tape X2 are secured to the left and right fastening tapes Y1 and Y2, respectively. Each is arranged.
- the left locking portion XI and the right locking portion X2 are separated by a predetermined distance in the width direction of the product.
- the locking portions XI and X2 are not limited to a rectangular force as a particularly desirable form. Other shapes may be used.
- the separation distance between the locking portions XI and X2 (distance between the closest portions) L2 is related to the length of the fastening tapes Y1 and Y2, but the locking portions XI and X2 are provided.
- Product width at the ventral longitudinal edge ST (hereinafter referred to as “product width”) 5.0 to 500 mm or 1Z2 or more of the male product width direction. If it is less than this range, the fastening tapes Yl and Y2 should be connected to the product width because the separation between the locking parts XI and X2 is not clearly visible or when a quick fastening operation is performed. There is no reduction in the possibility of accidentally fastening to the locking part opposite to the corresponding locking part beyond the direction center line.
- the possibility that the left fastening tape Y1 is locked to the right locking portion X2 is hardly prevented.
- the intermediate nonwoven fabric sheets 12C and Z or the thermocompression bonding portion extends to the side edge in the product width direction, an appropriate waist is generated on the side flaps, which is preferable. Better ,.
- the disposable diaper Z1 of the present embodiment is provided with a large number of elastic elastic rubber threads extending in the direction between the fastening tapes, and between the back fastening tapes Yl and Y2. Is configured to expand and contract.
- the fastening tolerance range of the fastening tapes Yl and Y2 at the time of fastening is expanded, and thus the fastening allowable range due to the difference in the wearer's body shape is widened.
- the fit when worn is improved by expansion and contraction.
- Appropriate elastic members such as an elastomer sheet are interposed between the tip and base ends of the fastening tapes Yl and Y2 that do not allow the rubber thread rubber to expand and contract between the back fastening tapes Y1 and Y2.
- the fastening tape Yl, Y2 itself may be expanded and contracted by disposing a male material of a hook-and-loop fastener on the tip side of the intervening elastic member.
- an elastic member such as an elastomer sheet is interposed between the so-called side slap part to which the fastening tapes Yl and Y2 adhere, and other parts, so that the back side fastening tapes Yl and Y2 expand and contract. You may comprise as follows. Even with these configurations, the effect of improving the fit and the tolerance range for differences in body shape cannot be obtained. It is.
- the stretch force of the rubber thread and the elastic member can be designed without any problem as long as it is used for known disposable diapers.
- the male material of the hook-and-loop fastener constituting part or all of the fastening tapes Yl and Y2 is a hook-shaped or mushroom-shaped swollen head shape that is entangled with the nonwoven fabric fiber that is the locking portion. Consists of a male material sheet with raised male elements (locking protrusions).
- the method for producing the fastening tape from this male material sheet is a known method. There is no particular limitation. Further, the size, density, etc. of the napped male element such as a bowl-shaped or mushroom-shaped bulge-shaped element may be appropriately selected within a range where an appropriate peel strength is obtained in relation to the exterior nonwoven fabric.
- a suitable peel strength between the fastening tapes Yl and Y2 and the locking portions XI and X2 is designed to be 100 gf to 1500 gfZ 25 mm, preferably 200 gf to 1000 gfZ 25 mm. If it is less than 1 OOgf, sufficient locking cannot be obtained, and if it exceeds 1500 gf, the locking force is too strong and fluffing of the locking part tends to occur when peeling off. In the present invention, it is desirable that the peel strength is less than lOOgf so that the male material is not locked at the portion between the locking portions XI and X2.
- the peel strength can be measured using an I tension tester (AOUTGRAPH AGS-G100N manufactured by SHIMADZU).
- the peel strength is measured as follows. First, weaving two cloth tapes of width 50mm x length 100mm in the width direction to make a double-fold cloth tape of width 25mm x 100mm, and attach the fastening tapes Yl and Y2 to one end of this cloth tape. Affix with force. At this time, the male members of the fastening tapes Yl and Y2 should be positioned outward from the tip of the cloth tape.
- a double-sided adhesive tape is attached to a stainless steel flat plate with the engaging portions XI and X2 of the back sheet 12 as the upper surface. Furthermore, both ends are fixed with craft tape.
- the crimped part is peeled off at 300 mmZmin, and the average weight of the measured unevenness is taken as the peel strength. .
- the measured value shall be the average of the effective measured values 3 to: LO times.
- the sample should be placed in the product width direction vs. product width direction.
- the size of the test piece is 23.5 ⁇ 1.5 mm (product longitudinal direction) X 25 mm (product width direction) for male materials of fastening tapes Yl and Y2, and 50 mm (product product) for locking parts XI and X2. Longitudinal direction) X 130mm (width direction).
- the suitable shearing force between the fastening tapes Yl, Y2 and the locking portions XI, X2 is designed to be 1 kg to: LO kg, preferably 3 to 8 kg. If it is less than 1 kg, the lock is released. If it exceeds 10 kg, the lock is too strong.
- This shearing force is measured as follows. First, a double-sided adhesive tape is applied to a stainless steel flat plate with the locking portions XI and X2 of the back sheet 12 as the upper surface. In addition, fix both ends with craft tape. At this time, a blank of a stainless steel flat plate is left around the engaging portions XI and X2 of the back sheet 12.
- the blank portion of the stainless steel flat plate and one end of the fastening tapes Yl and Y2 are chucked with a jig of a tensile tester.
- the distance between chucks is set to 50 mm.
- the measured value is the average of 3 to 10 effective measured values.
- the sample should be placed so that the measurement is in the product width direction vs. product width direction.
- the size of the test piece is 23.5 ⁇ 1.5mm (product longitudinal direction) X 24mm (product width direction) for male materials of fastening tapes Yl and Y2, and the locking parts XI and X2 are 50mm. (Product longitudinal direction) X 130mm (width direction).
- the pattern of the embossing for forming the locking portion can be appropriately determined as described in the first embodiment.
- the embossing E extends along the product longitudinal direction. When arranged, it is excellent in terms of stretchability and breathability around the stomach. Force depending on the manufacturing method Considering that the manufacturing method in which the MD direction of the back sheet 12 is the product width direction is a common manufacturing method, the emboss pattern is in the CD direction when the back sheet 12 is formed. The pattern along is good.
- being provided along the longitudinal direction of the product is not necessarily limited to the one with the linear emboss E as shown in the illustrated example, but as shown in FIG.
- the long zigzag embossing E is along the longitudinal direction of the product.
- an elliptical emboss pattern having a long side in the product longitudinal direction is also along the product longitudinal direction. It is only necessary that the longitudinal direction of the embossing is along the longitudinal direction of the product.
- FIG. 5 and 6 show a disposable diaper Z2 of the third embodiment.
- Fig. 6 is a cross-sectional view taken along line 2-2 in Fig. 5.
- This unfoldable disposable diaper 10 includes a back sheet 12 constituting the outer surface of the diaper, a liquid-permeable surface sheet 30 disposed on the skin surface side, and an absorption interposed between the exterior sheet 12 and the surface sheet 30. It comprises a body 50 and fastening tapes Yl, Y2 attached to both ends of the back sheet 12 on the back side.
- the fastening surface of the fastening tapes Yl and Y2 has a male material 130A, and when installing a diaper, the male material 130A of the back fastening tape Y1 and Y2 is placed at any location on the ventral surface of the back sheet 12. It is designed to be locked.
- the top sheet 30 has a rectangular shape wider than the absorbent core 56, extends slightly outward from the side edge of the absorbent core 56, and is fixed to the back sheet 12 with a hot melt adhesive or the like.
- the top sheet 30 is sufficient if it has liquid permeability, and for example, a porous or non-porous nonwoven cloth, a porous plastic sheet, or the like can be used.
- the nonwoven fabric is not particularly limited as to what the raw fiber is.
- synthetic fibers such as polyethylene and polypropylene, synthetic fibers such as polyester, polyamide, and polyurethane, recycled fibers such as rayon cuvula, natural fibers such as cotton, etc. are used. Examples thereof include mixed fibers and composite fibers.
- the non-woven fabric may be produced by any kind of cage.
- the spunlace method As processing methods, known methods, examples for example, the spunlace method, the spunbond method, the thermal bond method, the melt blown method, the needle punch method, the air-through method, the point bond method and the like can be exemplified.
- the spun lace method is a preferable processing method for obtaining flexibility and drapability
- the thermal bond method is a preferable processing method for determining bulkiness and softness.
- the top sheet 30 may be composed of a single sheet or a laminated sheet obtained by laminating two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.
- an intermediate between the surface sheet 30 and the absorbent body 50 which is faster than the surface sheet 30 and usually called a "second sheet" A seat 40 can be provided.
- This intermediate sheet 40 prevents the “reversing” phenomenon of the absorbed core force of the absorbed liquid by the force by quickly transferring the liquid to the absorbent core and enhancing the absorption performance by the absorbent core, and always keeps the top sheet 30 on the surface sheet 30. It can be kept dry.
- the intermediate sheet 40 can be omitted.
- Examples of the intermediate sheet 40 include the same material as the top sheet 30, spun lace, pulp non-woven fabric, a mixed sheet of pulp and rayon, point bond, or crepe paper.
- an air-through nonwoven fabric and a spunbond nonwoven fabric are preferable.
- the intermediate sheet 40 in the form shown in the figure may be provided over the entire force width that is shorter than the width of the absorbent core 56 and arranged in the center.
- the length of the intermediate sheet 40 in the longitudinal direction may be the same as the length of the absorbent core 56, or may be within a short or long range centered on the region that receives the liquid.
- a typical material for the intermediate sheet 40 is a nonwoven fabric excellent in liquid permeability.
- the knurled cuff 60 includes a knurled sheet 64 made of a water-repellent nonwoven fabric substantially continuous in the width direction, and an elastic elastic member 62 fixed to the knurled sheet 64 in an expanded state. It is made up of.
- this elastic elastic member 62 thread rubber or the like can be used. For example, as shown in FIG. 5 and FIG.
- the inner surface of the barrier one sheet 64 has a fixing start edge at a position separated from the side edge of the top sheet 30 (or may be on the side portion of the top sheet 30). It is fixed to the side of the sheet 12 with a hot melt adhesive or the like.
- elastic elastic members 66 such as rubber thread are provided along the front-rear direction between the sheets of the portion where the noir sheet 64 and the back sheet 12 face each other.
- the inner side from the standing end of the NORY cuff 60 is a free part that is not fixed to the product body, and this free part comes to stand by the contraction force of the rubber thread 62.
- the diaper is attached to the body in the shape of a boat, and the contraction force of the rubber thread 62 acts, so that the barrier force hoop 60 stands up around the leg by the contraction force of the rubber thread 62.
- the space surrounded by the standing part forms a confined space for urine or soft stool. When urinating into this space, the urine is absorbed into the absorbent core 56 through the surface sheet 30, and the raised portion of the Noriya cuff 60 becomes NORY for the solid matter of loose stool, and the rid of it can be overcome. Is prevented. In the unlikely event that urine leaks laterally over the standing distal edge of the standing part, side leakage is prevented by the stop function by the flat contact part.
- the absorber 50 is a part that absorbs and holds liquids such as urine and loose stool.
- the absorbent body 50 includes an absorbent core 56 and a covering sheet 58 that wraps at least the back and side surfaces of the absorbent core 56.
- the covering sheet 58 can be omitted.
- a holding sheet 80 is provided between the absorbent core 56 and the back surface side portion (lower part) of the covering sheet 58, but the holding sheet 80 may be omitted.
- the absorber 50 can be bonded to the inner surface of the back sheet 12 via an adhesive such as a hot melt adhesive on the back surface.
- the absorbent core 56 not only those in which short fibers such as cotton-like pulp are stacked, but also those having an aggregate strength of the filaments 52, 52, etc. can be used.
- the aggregate of the filaments 52, 52... Can be obtained by opening the tow (fiber bundle).
- tow constituent fibers include polysaccharides or derivatives thereof (cellulose, cellulose Ester, chitin, chitosan, etc.), synthetic polymers (polyethylene, polypropylene, polyamide, polyester, polylactaamide, polybutyrate, etc.) can be used. Cellulose esters and cellulose are particularly preferred.
- cellulose cellulose derived from plants such as cotton, linter and wood pulp, butterfly cellulose, etc. can be used.
- Regenerated cellulose which may be regenerated cellulose such as rayon, is a spun fiber. Moyo.
- Examples of the cellulose ester that can be suitably used include organic acid esters such as cellulose acetate, cellulose butyrate, and cellulose propionate; cellulose acetate propionate, cellulose acetate butyrate, cellulose acetate phthalate, It is possible to use mixed acid esters such as cellulose nitrate acetate; and cellulose ester derivatives such as poly force prolataton graft cellulose cellulose ester. These cellulose esters can be used alone or in admixture of two or more.
- the viscosity average degree of polymerization of the cellulose ester is, for example, about 50 to 900, preferably about 200 to 800.
- the average substitution degree of the cellulose ester is, for example, about 1.5 to 3.0 (for example, 2 to 3).
- the average degree of polymerization of the cellulose ester can be, for example, about 10 to 1000, preferably about 50 to 900, and more preferably about 200 to 800.
- the average degree of substitution of the cellulose ester is, for example, about 1 to 3. It is preferably about 1 to 2.15, more preferably about 1.1 to 2.0.
- the average degree of substitution of the cellulose ester can be selected from the viewpoint of enhancing biodegradability.
- an organic acid ester for example, an ester with an organic acid having about 2 to 4 carbon atoms
- cellulose acetate is suitable.
- the acetylation degree of cellulose acetate is often about 43 to 62%, but about 30 to 50% is particularly preferable because it is excellent in biodegradability.
- a particularly preferred cellulose ester is cellulose diacetate.
- the tow-constituting fibers may contain various additives such as a heat stabilizer, a colorant, an oil, a yield improver, a whiteness improver, and the like.
- the fineness of the tow constituting fiber is, for example, 1 to 16 denier, preferably 1 to 10 denier, and 1 to 6 denier is desirable.
- the tow constituent fiber is preferably a force crimped fiber which may be a non-crimped fiber.
- the crimped degree of the crimped fibers can be, for example, about 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch.
- a crimped fiber that is uniformly crimped is often used. When crimped fibers are used, a bulky and light absorbent core can be produced, and a highly integrated tow can be easily produced by entanglement between the fibers.
- the cross-sectional shape of the tow constituting fiber is not particularly limited, and may be any of, for example, a circular shape, an elliptical shape, an irregular shape (for example, a Y shape, an X shape, an I shape, an R shape) or a hollow shape. Also good.
- the fiber is composed of, for example, 1,000 to 1,000,000 tow (fiber bundle) formed by bundling about 1,000 to 1,000,000 single fibers. Can be used in the form.
- the fiber bundle is preferably formed by bundling about 1,000 to 1,000,000 continuous fibers.
- Cellulose diacetate tow veils that can be suitably used in the present invention are commercially available from Celanese, Daicel Chemical Industries, and the like.
- Cellulose diacetate tow bale has a density of about 0.5 gZcm 3 and a total weight of 400-600 kg. From this bale, the tow is peeled off and spread into a wide band so as to have a desired size and bulk.
- the opening width of the tow is arbitrary, and can be, for example, a width of 50 to 2000 mm, preferably about 50 to 300 mm, which is the width of the absorbent core of the product.
- the density of the absorbent core can be adjusted by adjusting the degree of tow opening.
- superabsorbent polymer particles 54, 54... are contained in the absorbent core 56. It is desirable that the superabsorbent polymer particles (SAP particles) are dispersed substantially throughout the thickness direction with respect to the aggregate of the filaments 52, 52... At least in the liquid receiving region. This state of being dispersed substantially throughout the thickness direction is conceptually shown as an enlarged view of the main part of FIG.
- “distributed in the entire thickness direction” means “distributed unevenly” in the upper, lower, and / or middle portions of the aggregate of filaments, in addition to the form “uniformly” distributed in the entire thickness direction. This includes forms that are still distributed in the upper, lower and middle parts.
- some SAP particles do not penetrate into the aggregate of filaments 52, 52, but remain on the surface, and some SAP particles form aggregates of filaments 52, 52, and so on. Neither the form passing through the covering sheet 58 nor the form lying on the holding sheet 80 is excluded.
- the superabsorbent polymer particles 54 include “powder” in addition to “particles".
- the particle size of the superabsorbent polymer particles 54 can be used as it is for this kind of disposable ommu, and is preferably 100 or less, particularly 150 to 400 m.
- the material of the superabsorbent polymer particles 54 is preferably a force that can be used without any limitation and a water absorption capacity of 0 gZg or more.
- the superabsorbent polymer particles 54 include starch-based, cellulose-based and synthetic polymer-based types such as starch acrylic acid (salt) graft copolymer, saponified starch-acrylo-tolyl copolymer, sodium carboxy. A cross-linked product of methyl cellulose or an acrylic acid (salt) polymer can be used.
- As the shape of the superabsorbent polymer particles 54 it is possible to use a powder or other shape which is suitable for a normally used granular material.
- the superabsorbent polymer particles 54 those having a water absorption speed of 0 second or less are preferably used. When the water absorption speed exceeds 40 seconds, so-called reversal that the liquid supplied into the absorption core 56 returns to the outside of the absorption core 56 easily occurs.
- the superabsorbent polymer particles 54 those having a gel strength of lOOOPa or more are preferably used. Thereby, even when the absorbent core 56 is bulky, the sticky feeling after liquid absorption can be effectively suppressed.
- the basis weight of the superabsorbent polymer particles 54 can be appropriately determined according to the absorption capacity required for the use of the absorbent core 56. Therefore, although it cannot be generally stated, it can be 50 to 350 g Zm 2 . By setting the basis weight of the polymer to 50 gZm 2 or less, it is possible to prevent the light weight effect from becoming difficult to be exhibited by adopting the synthetic continuous fiber due to the weight of the polymer. If it exceeds 350 gZm 2 , the superabsorbent polymer particles 54 will be given a sense of incongruity due to the excess of power if the effect is saturated.
- the superabsorbent polymer particles 54 are spread in the plane direction of the absorbent core 56.
- the application amount can be adjusted. For example, it is possible to increase the spraying amount of the liquid excretion part than other parts.
- men can increase the front spray density (quantity) and women can increase the central spray density (quantity).
- a portion where no polymer exists locally (for example, in the form of a spot) in the planar direction of the absorbent core 56 can also be provided.
- a plurality of superabsorbent polymer particles 54 having different particle size distributions are prepared, and are sequentially supplied in the thickness direction. It is possible to distribute things with a large distribution.
- the ratio between the superabsorbent polymer particles 54 and the continuous fibers affects the absorption characteristics.
- the weight ratio in the planar area of 5 cm ⁇ 5 cm in the region directly receiving the liquid in the absorbent core 56 is desirably a superabsorbent polymer particle Z continuous fiber weight force of 1 to 14, particularly 2 to 9.
- tissue paper especially crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet having small holes, and the like can be used. However, it is desirable that the sheet does not allow high-absorbent polymer particles to escape.
- non-woven fabric instead of crepe paper, hydrophilic SMMS (spunbond Z meltblown Z meltblown Z spunbond) non-woven fabric is particularly suitable, and polypropylene, polyethylene Zpolypropylene, etc. can be used as the material.
- the basis weight is preferably 5 to 40 gZm 2 , particularly 10 to 30 gZm 2 .
- the covering sheet 58 is composed of continuous fibers 52, 52 ⁇ and a force of a form that wraps the entire layer of superabsorbent polymer particles 54, 54 ⁇ , Only the back and side surfaces of the layer may be covered.
- the upper and side surfaces of the absorbent core 56 are covered with a non-woven cloth, and the lower surface is covered with a liquid-impermeable sheet such as polyethylene, and the upper surface of the absorbent core 56 is covered with a non-woven cloth.
- the side and bottom surfaces may be covered with a liquid impervious sheet such as polyethylene (each of these materials is a component of the enveloping sheet).
- the aggregate of continuous fibers 52, 52... And the layer of superabsorbent polymer particles 54, 54... May be sandwiched between two upper and lower sheets or placed on the lower surface only. It is difficult to prevent the migration of the conductive polymer particles, so it is not desirable. [0117] (Retaining sheet)
- the superabsorbent polymer particles 54 can be interposed between the holding sheet 80 and the absorbent core 56 by spraying or the like.
- the superabsorbent polymer particles 54 may pass through the aggregate of continuous fibers 52 at the time of supply to the aggregate of continuous fibers 52 or in the subsequent process or until the consumer uses it.
- the irregularities of the superabsorbent polymer particles that have passed through the aggregate of continuous fibers give a crisp and uncomfortable feeling when touched by the hand when used by consumers. Therefore, it is also a preferable form that a holding sheet 80 having the holding performance of the superabsorbent polymer 54 is interposed between the absorbent core 56 and the covering sheet 58.
- This holding sheet 80 reinforces the stiffness that is not sufficient only with the covering sheet 58 such as tissue paper (crepe paper), and reduces or prevents a sense of incongruity when touched by the hand when the consumer uses it.
- the material of the holding sheet 80 is not particularly limited as long as it has the holding performance of the superabsorbent polymer 54.
- non-woven fabric, crimped pulp, low-absorbency cotton fiber for example, non-degreased cotton fiber, degreased cotton fiber, rayon fiber treated with water repellent or hydrophobizing agent, etc.
- Polyethylene fiber, polyester fiber, talyl fiber, polypropylene fiber, silk, cotton, hemp, nylon, polyurethane, acetate fiber, etc. can be displayed.
- the holding sheet 80 When the holding sheet 80 is a non-woven fabric, the holding sheet 80 has a compression energy based on the KES test of 0.01 to: LO. 00 gfcm / cm 2 , preferably 0.01 to: L OOgfcm / cm 2 And a compression resilience of 10 to 100%, preferably 70 to 100%.
- the reason for providing the holding sheet 80 is to hold, for example, the superabsorbent polymer 54 that has fallen down (dropped out) from the absorbent core 56, as mentioned above. Accordingly, since the superabsorbent polymer particles 54 that have come out come into contact with the user via the covering sheet 58 and the holding sheet 80, there is no possibility of being conveyed to the user as a sense of incongruity. In particular, the non-woven fabric having the above-described compression energy and compression resilience sufficiently exhibits its function.
- the superabsorbent polymer 54 that has escaped is held by the holding sheet 60, and the covering sheet There is no risk of uneven absorption capacity.
- an adhesive hot melt adhesive or the like can be applied on the holding sheet 80 in advance.
- the upper surface of the holding sheet 80 (the surface facing the use surface side) may be roughened to prevent the highly absorbent polymer particles 54 from moving on the holding sheet 80.
- roughening or fluffing means for this purpose, non-net surface that is not a net surface at the time of manufacturing the nonwoven fabric, marble force check, processing by needle punch, brushing check, etc. may be mentioned. Can do.
- the holding sheet 80 may be provided only below the absorbent core 56 as shown in FIG. 6 or is not shown, but is wound up to the upper surface of the absorbent core 56 through the side surface of the absorbent core 56 and extended. May be. It is also possible to use a plurality of holding sheets 80 in a stacked manner.
- the above example is an example in which the holding sheet 58 is provided between the absorbent core 56 and the back side portion of the covering sheet 58, but the holding sheet may be on the back side from the covering sheet 58. (The form is not shown in the figure.) In short, if a holding sheet is provided on the back surface side of the absorbent core 56, it is possible to reduce or not cause a jarring discomfort when touching the back surface force of the product.
- the fastening tapes Yl and Y2 have a fastening base material 130C whose base portion is joined to the diaper and whose distal end side is free without being fixed, and a male material 130A joined to the inner surface of the distal end side.
- the fastening substrate 130C can be formed using plastic, polylaminated nonwoven fabric, paper or the like.
- the male material 130A is bonded to the fasting base material 130C by an adhesive so as not to be peeled off.
- the male material 130A has a number of locking protrusions 130D on the outer surface side. As shown in Fig.
- the shape of the locking protrusion 130D is as follows: (A) Le-shaped, (B) J-shaped, (C) Mushroom-shaped, (D) T-shaped, (E) Double J-shaped Any force can be used, such as a force in which a CF-shaped object is joined back to back.
- Preferred is a shape that easily entangles with the fibers of the back surface sheet 12, such as a letter shape, a J shape, a T shape, or a double J shape.
- the fastening tapes Yl and Y2 are folded to the surface sheet 30 side, and the male material 130A is detachably bonded to the side nonwoven fabric.
- Constituent fibers of the exterior nonwoven fabric 12B of the back sheet 12 to which the fastening tapes Yl and Y2 are fixed include, for example, polyolefin fibers such as polyethylene and polypropylene, synthetic fibers such as polyester and polyamide, and rayon.
- Recycled fibers such as cubula, natural fibers such as cotton, and non-woven fabric obtained by appropriate processing methods such as spunlace method, spunbond method, thermal bond method, air-through method, needle punch method, etc.
- the fastening tape Yl On the abdomen opening side, on the inner surface side of the knock sheet 12, the fastening tape Yl, the male material of ⁇ 2 13 The fastening position on which the design that serves as a guide for fastening the OA is applied by printing etc.
- a display sheet 74 is provided so as to be visible through the back sheet 12 from the outside.
- the fastening position display sheet 74 can be omitted in order to improve the air permeability.
- the material of the fastening position display sheet 74 it is preferable to use a material such as a non-woven fabric or paper having air permeability.
- the unfoldable disposable omgu Z2 is designed to fit the body by adjusting the fastening position of the fastening tapes Yl and Y2.
- the elastic elastic member such as rubber
- the illustrated embodiment in which the elastic elastic member is often not provided at the portion overlapping the absorber 50 also adopts this structure.
- the back sheet 12 supports the absorber 50 and is a part for wearing on the wearer.
- the back sheet 12 has an hourglass shape in which the center part in the front-rear direction on both sides is constricted, and this is the part where the wearer's legs are inserted.
- the absorber 50 and the top sheet 30 are installed at predetermined positions on the inner surface side of the back sheet 12, and are fixed by an adhesive such as a hot melt adhesive. Further, the predetermined portion on the outer surface of the back sheet 12 is a locking portion X to which the male material 130A of the fastening tapes Yl and Y2 is locked.
- the locking part X is on the opposite side of the dorsal side and the abdomen side with the fastening tapes Yl and Y2, and the male material 130A is locked, its position and dimensions can be arbitrarily determined.
- the locking portion X is a rectangular range with a length of 20 to 80 mm in the front-rear direction and a width of 150 to 300 mm, and the separation distance between the upper end edge and the waist opening in the front-rear direction Is preferably 0 to 60 mm, more preferably 20 to 50 mm, and the center in the width direction of the product.
- the back sheet 12 is mainly composed of the hydrophobic sheet 12A on the inner surface side and the nonwoven sheet 12B on the outer surface side, and an intermediate layer nonwoven fabric is interposed between them as necessary. It is formed by interposing and laminating and bonding with hot melt adhesive H.
- a non-woven fabric is used as the hydrophobic sheet 12A so that the back sheet 12 is made of only a non-woven fabric, and a polyethylene film or the like is placed between the inner surface of the back sheet 12 and the outer surface of the absorbent body 50.
- a liquid film impervious sheet made of an oil film is not provided.
- a water-insoluble one is used as the hot melt adhesive H for bonding the water-phobic sheet 12A and the nonwoven sheet 12B.
- the hot melt adhesive H is applied to the portion of the back sheet 12 that overlaps the absorbent body 50 and its surrounding portion, so that the water pressure resistance of the coated portion is 400 mmAq or more.
- FIGS. 7A and 7B show examples of the back sheet 12, respectively. If the water pressure resistance is less than 400 mmAq, the liquid-insulating sustainability is insufficient, and the liquid gradually oozes out, causing leakage even within the normal wearing time.
- the water pressure resistance is more preferably 700 to 1 OOOmmAq. If the water pressure is too high, the air permeability may be lowered, which is preferable.
- the type of the non-woven fabric forming the hydrophobic sheet 12A and the non-woven fabric for exterior 12B and the type of the water-soluble hot melt resin H are not limited, but the non-woven fabric 12A, 12B is 1.
- a single-layer nonwoven fabric composed of fibers of less than 2 dtex, in particular 0.5 to 0.9 dtex, and a fiber basis weight of 15 g Zm 2 or more, especially 20 to 25 gZm 2 or a fiber basis weight lOgZm 2 or more, especially 15 to 25 g / m 2
- the melt blown nonwoven fabric can be used.
- the more preferable nonwoven fabrics 12A and 12B are formed by laminating a plurality of fiber layers, at least one layer being less than 1.2 dtex, particularly having a fiber strength of 0.5 to 0.9 dtex, and a fiber basis weight of 15 g / m 2.
- the fibers of the nonwoven fabrics 12A and 12B are too thick, the fiber basis weight is too small, or the amount of hot melt resin H applied is increased, the liquid shielding property may be insufficient. If the fibers of the nonwoven fabrics 12A and 12B are too thin, the strength may be insufficient and the sheet 70 may be torn. Non-woven fabric 12A, 12B has too much fiber Then, the rigidity and weight may increase unnecessarily, resulting in a poor feeling of wearing.
- the back sheet 12 as a whole preferably has a basis weight of 15 to 50 gZm 2 and a thickness of 0.01 to 0.5 mm.
- the non-woven fabric forming the hydrophobic sheet 12A and the non-woven fabric 12B for exterior use can basically use the same material. It is not necessary to use the same material, and appropriate materials are selected individually as necessary. be able to.
- the hydrophobic sheet 12A and the non-woven sheet 12B are overlapped, and the sheets are bonded to each other via a water-insoluble hot melt resin H, and elastic between the sheets 12A and 12B.
- the stretchable member is fixed in the stretched state and the back sheet 12 is fitted to the wearer by its contraction force.
- the water-insoluble hot melt resin H has a function of joining the hydrophobic sheet 12A and the nonwoven sheet 12B only by the function of enhancing the liquid shielding property of the back sheet 12, and the hydrophobic sheet 12A and the nonwoven sheet 12B. It also bears the function of fixing the elastic elastic member between the two.
- the elastic elastic member thread rubber or elastic foam band can be used, but it is desirable to arrange a plurality of thread rubbers together or at intervals.
- water-insoluble hot melt resin H water-insoluble hot melt adhesives widely used in this technical field can be used.
- AFX-088A Yamatta Findlay Co., Ltd.
- a hydrophilic one can be used.
- the water-insoluble hot melt resin H can be applied to both the front and back surfaces of the hydrophobic sheet 12A and the non-woven sheet 12B. However, it is preferable to apply it to the surface without exposing it to the outside.
- the amount of water-insoluble hot melt resin H can be determined appropriately. In the case of the above-mentioned non-woven fabric with fineness and basis weight, at least 5 to 30 g / m 2 or more within the range where it is necessary to ensure water resistance. In particular, 8 to 10 g / m 2 is preferable. If the coating amount is insufficient, the liquid will gradually permeate, which may result in insufficient liquid shielding durability. If the amount applied is too large, the air permeability may be reduced and the cost effectiveness may be reduced.
- the application pattern of water-insoluble hot melt resin H is not particularly limited, Known coating methods such as spirals, summits (with reduced spiral spacing), slots, etc., can be used. Regardless of regular / irregularity, the adhesive can be applied in a regular pattern. preferable.
- a particularly preferable pattern is a pattern in which a plurality of rows of coating lines H connected in the front-rear direction or the width direction of the diaper are provided at predetermined intervals as shown in Fig. 7 (a), or as shown in Fig. 7 (b).
- a pattern in which dot-like application points H are provided in the form of scattered dots is preferable from the viewpoint of manufacturability.
- the total adhesion area is 90% or more and less than 100%
- the application line H It is preferable that the line width w (—book) of the film is 0.1 to 3 mm, or the area (one point) of the application point H is 0.05 to 5 mm 2 .
- the liquid shielding sustainability tends to be insufficient.
- the liquid sustainability tends to be insufficient, and if the line width or the dot area is too wide, the air permeability tends to deteriorate.
- Particularly preferable ranges are 95 to 97% of the total coating area, the width of the coating line H is 1 to 2 mm, and the area of the coating point H is 2 to 4 mm 2 .
- the amount of water-insoluble hot melt resin H applied locally at the locking portion X of the back sheet 12 is locally increased compared to other portions, and the durability against peeling of the male material 130A is relatively high. It is preferable to reinforce.
- a method of double-coating the water-insoluble hot melt resin H or a method of locally increasing the coating amount without repeated coating can be employed.
- the coating pattern can be determined as appropriate.
- These pattern coatings can be realized by using, for example, spiral patterns such as spiral coating and summit coating, curtain coating, and bead coating.
- FIG. 8 to FIG. 10 show examples of combinations of various patterns.
- the example shown in FIG. 8 employs a linear pattern in which a plurality of rows of coating lines H continuous in the front-rear direction of the diaper are provided at predetermined intervals as the pattern to be applied first.
- the example shown in FIG. The pad to apply As a turn, a linear pattern in which a plurality of rows of coating lines H that are continuous in the diaper width direction is provided at a predetermined interval is adopted.
- FIG. A pattern in which dots are provided in a dotted pattern is adopted.
- the pattern shown in Fig. 8 (a) is applied along an oblique direction intersecting the diaper front-rear direction and the width direction as a pattern to be applied later.
- a diagonal lattice pattern is used in which a plurality of lines Hs are provided in parallel and a plurality of coating lines Hs are provided in parallel with the diaper longitudinal direction.
- a spiral pattern Hp such as a snail coating or a summit coating is adopted as a pattern to be applied later.
- the pattern shown in (d) uses a pattern in which two wavy coating lines Hw whose phases are shifted by 180 degrees are provided as patterns to be applied later.
- a pattern in which a plurality of wavy coating lines Hw are provided in parallel is adopted as a pattern to be applied later.
- a pattern in which a plurality of concentric coating lines He is provided as a pattern to be applied later is adopted.
- the pattern shown in (c) employs a pattern in which dot-like application points Hd are formed in a scattered pattern as a pattern to be applied later.
- the one shown in FIG. 10 (c) employs a linear pattern in which a plurality of coating lines Hf continuous in the front-rear direction of the diaper are provided at predetermined intervals as a pattern to be applied later.
- adopts the linear pattern which provides the application
- the diaper components can be fixed to each other by solid, bead, spiral or summit coating such as hot melt adhesive.
- the third embodiment adopts a part of the configuration of another embodiment, or applies a part of the configuration of the third embodiment to another embodiment. It is also possible to do.
- FIG. 13 is a schematic view of the method for producing the back sheet for absorbent articles of the present invention.
- a continuous sheet-like hydrophobic sheet 12A such as a raw roll S1
- a coating machine 5 or a spreader Place hot melt adhesive H in
- the upstream roll such as the raw roll S2 is conveyed.
- the continuous sheet-shaped nonwoven fabric sheet 12B is placed so as to overlap the hydrophobic sheet 1 2A on which the hot-melt adhesive H is placed, and hot between the two sheets. Laminate both sheets with the melt adhesive interposed.
- the nonwoven fabric in which the separate member sheets are overlapped in advance may be supplied with an original roll force, or a separate continuous member sheet may be supplied between the hydrophobic sheet and the nonwoven sheet. If it is partly arranged, the continuous separate member sheet to be supplied should be cut intermittently.
- the simple multilayering of sheets can be done based on known techniques. In this case, the hot melt adhesive may or may not be interposed between the separate member sheet and the non-woven sheet, but it is desirable to intervene.
- hydrophobic sheet 12A As the hydrophobic sheet 12A, the nonwoven fabric sheet 12B, and the separate member sheet 12C, the same ones as described in the first to third embodiments can be used.
- the amount of hot melt adhesive H used between the hydrophobic sheet 12A and the non-woven sheet 12B is 0.5-30. Particularly preferred is 3.0 to 15. OgZm 2 .
- the coating machine 5 for applying the hot melt adhesive H a known coating machine such as a slot coater or a curtain coater can be used. Alternatively, it may be applied by a method of spraying hot melt powder or by spraying using a spray nozzle. The application state is not particularly limited.
- the laminated sheet 12 'laminated in this way is supplied to the embossing apparatus 3 having the convex embossing roll 3A having the convex portions for embossing formed on the entire surface, embossed, and laminated. The sheet is thermocompression bonded.
- the force used as the embossing roll in the present embodiment may be a thermocompression bonding with a simple heat roll that is not an embossing roll.
- an embossing roll is used as the thermocompression bonding means will be mainly described. 1S
- the thermocompression bonding means in the present invention is not limited to an embodiment using an embossing roll, and, for example, ultrasonic bonding can be adopted.
- the embossing is performed such that the nonwoven fabric sheet 12B side is pressed by the convex embossing roll 3A.
- the roll 3B facing the convex embossing roll 3A may be a concave embossing roll in which a concave portion corresponding to the convex portion of the convex embossing roll is formed, or provided with a degree of flexibility that the convex portion of the convex embossing roll is pushed in. It can be a rubber roll. Not particularly limited.
- the embossed area which is the adhesion point area of the convex part of the convex embossing roll, is 5 to 50%, preferably 5 to 40%, particularly preferably 10 to 30%. If the embossed area is less than 5%, the adhesive strength is insufficient, and if it is more than 50%, the sheet obtained by embossing may become hard and the texture may be impaired.
- the embossing pressure during embossing is preferably 3 to 20 kgfZcm2. If it is less than 3 kgf ZCM 2, when the coating amount of the adhesive is within the above range Nio, Te becomes insufficient adhesion between the hydrophobic sheet 1 2A and the nonwoven fabric sheet 12B, 20KgfZcm 2 larger than the nonwoven fabric sheet over preparative 12B May harden and its texture may be impaired. Note that. Since the edge boss pressure is also affected by the processing speed, it can be appropriately changed without departing from the gist of the present invention.
- the peel strength between the hydrophobic sheet 12A and the nonwoven sheet 12B is substantially inseparable. In other words, if you try to force it off, it will adhere firmly enough to damage the back sheet. The same applies when another member sheet 12C is interposed.
- Embossing conditions are embossing pressure 7kgfZcm 2 , 0.3mm clearance, sheet flow speed 16
- the loop tack test has not been used as an index of hot melt adhesive wrapping at the time of embossing embossing having unevenness.
- this test result shows that the exfoliation from the nonwoven fabric surface and the occurrence of wrapping at the time of embossing are suppressed, especially from the results of peel strength in a loop tack test at 40 ° C, which is different from the embossing temperature. It is particularly significant that the scope to be made has been found.
- Table 2 shows the details of the force that each example and comparative example correspond to, and the amount of hot melt used and the amount of embossing.
- the embossing conditions are as follows: Embossing pressure 7kgf Clearance 0.3mm, Sheet flow speed 165mZmin, Crimping time 0.9 seconds Z sheets.
- the KES bending measurement value was measured using a pure bending tester (manufactured by Kato Tech Co., Ltd .: KES—FB—2A OUT—A) for a specimen cut into a length of 200 mm and a width of 200 mm. This is the value when bent at a DFE sensitivity of 20, and a curvature range of 0.0 to 0.5 cm 1 .
- the sensory evaluation was evaluated as X when the tester felt soft when actually touching the hand, and X when the tester felt softness.
- the adhesive strength (A) between the film sheet and the nonwoven fabric sheet was measured using a tensile tester (AOUTGRAPH AGS-G100N manufactured by SHIMAD ZU).
- the measurement method is 25 Create a sample (back sheet) cut to mm x 130 mm, peel off 5 cm in advance in the longitudinal direction with cold spray, and under the conditions of 20 mm, chuck 50 mm, pulling speed 300 mmZmin
- the adhesive strength (peel strength) was measured when a 30 mm length from the tear-off port was peeled by the bow
- the measured values are the average value of the values measured by creating two types of samples, one whose longitudinal direction is the product vertical direction and one whose longitudinal direction is the product horizontal direction. is there.
- the peel strength (B) between the nonwoven fabric sheet and the male material was a sample cut to 50 mm x 130 mm.
- the expandable absorbent article of the present invention according to this test is superior to the comparative example in that there is no risk of delamination due to peeling at the time of fastening, and the softness is excellent. It was shown that.
- the disposable diaper of the present invention can be used as a deployable disposable diaper.
- the production method of the present invention includes an unfoldable disposable diaper, a pants-type disposable diaper, When manufacturing back sheets for other absorbent articles such as scientific napkins and urine pads, it is also used for disposable products such as surgical clothing and packaging materials, especially products that require liquid impermeability and a good touch feeling. It can also be used in the production of the exterior sheet to be used.
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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Vascular Medicine (AREA)
- Epidemiology (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Mechanical Engineering (AREA)
- Absorbent Articles And Supports Therefor (AREA)
Description
Claims
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JP2008508670A JPWO2007114362A1 (ja) | 2006-03-31 | 2007-03-30 | 展開型吸収性物品 |
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JP2006-101164 | 2006-03-31 | ||
JP2006101164 | 2006-03-31 | ||
JP2006152845 | 2006-05-31 | ||
JP2006152844 | 2006-05-31 | ||
JP2006-152845 | 2006-05-31 | ||
JP2006-152844 | 2006-05-31 |
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WO2007114362A1 true WO2007114362A1 (ja) | 2007-10-11 |
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PCT/JP2007/057182 WO2007114362A1 (ja) | 2006-03-31 | 2007-03-30 | 展開型吸収性物品および吸収性物品用裏面シートの製造方法 |
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JP (2) | JPWO2007114362A1 (ja) |
KR (1) | KR20090018035A (ja) |
WO (1) | WO2007114362A1 (ja) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011056157A1 (en) * | 2009-11-06 | 2011-05-12 | Korozo Ambalaj Sanayi Ve Ticaret Anonim Sirketi | High-strength loop piece formed to be used on the straps of diapers for babies and adults |
JP2012157599A (ja) * | 2011-02-01 | 2012-08-23 | Unicharm Corp | 吸収性物品 |
US8841507B2 (en) | 2010-08-20 | 2014-09-23 | The Procter & Gamble Company | Absorbent article and components thereof having improved softness signals, and methods for manufacturing |
WO2014171556A1 (ja) * | 2014-01-14 | 2014-10-23 | ユニ・チャーム株式会社 | 使い捨ておむつ及びその製造方法 |
US10639212B2 (en) | 2010-08-20 | 2020-05-05 | The Procter & Gamble Company | Absorbent article and components thereof having improved softness signals, and methods for manufacturing |
Families Citing this family (6)
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JP5743414B2 (ja) * | 2010-03-18 | 2015-07-01 | 大王製紙株式会社 | テープタイプ使い捨ておむつ |
JP5882648B2 (ja) * | 2011-09-27 | 2016-03-09 | 大王製紙株式会社 | テープタイプ使い捨ておむつ |
JP6028989B2 (ja) * | 2011-09-27 | 2016-11-24 | 大王製紙株式会社 | テープタイプ使い捨ておむつ |
JP6219449B2 (ja) * | 2016-05-20 | 2017-10-25 | 大王製紙株式会社 | テープタイプ使い捨ておむつ |
EP3494189A1 (en) * | 2016-08-05 | 2019-06-12 | Bostik, Inc. | Method of reducing adhesive build-up on roller surfaces |
JP6564356B2 (ja) * | 2016-11-25 | 2019-08-21 | 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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- 2007-03-30 JP JP2008508670A patent/JPWO2007114362A1/ja active Pending
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WO2011056157A1 (en) * | 2009-11-06 | 2011-05-12 | Korozo Ambalaj Sanayi Ve Ticaret Anonim Sirketi | High-strength loop piece formed to be used on the straps of diapers for babies and adults |
US8841507B2 (en) | 2010-08-20 | 2014-09-23 | The Procter & Gamble Company | Absorbent article and components thereof having improved softness signals, and methods for manufacturing |
US9629755B2 (en) | 2010-08-20 | 2017-04-25 | The Procter & Gamble Company | Absorbent article and components thereof having improved softness signals, and methods for manufacturing |
US9770371B2 (en) | 2010-08-20 | 2017-09-26 | The Procter & Gamble Company | Absorbent article and components thereof having improved softness signals, and methods for manufacturing |
US10639212B2 (en) | 2010-08-20 | 2020-05-05 | The Procter & Gamble Company | Absorbent article and components thereof having improved softness signals, and methods for manufacturing |
JP2012157599A (ja) * | 2011-02-01 | 2012-08-23 | Unicharm Corp | 吸収性物品 |
WO2014171556A1 (ja) * | 2014-01-14 | 2014-10-23 | ユニ・チャーム株式会社 | 使い捨ておむつ及びその製造方法 |
CN105916476A (zh) * | 2014-01-14 | 2016-08-31 | 尤妮佳股份有限公司 | 一次性尿布及其制造方法 |
US10357408B2 (en) | 2014-01-14 | 2019-07-23 | Unicharm Corporation | Disposable diaper with lengthwise adhesive region that cross widthwise adhesive regions and method of its production |
Also Published As
Publication number | Publication date |
---|---|
KR20090018035A (ko) | 2009-02-19 |
JP2009183797A (ja) | 2009-08-20 |
JPWO2007114362A1 (ja) | 2009-08-20 |
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