WO2020066512A1 - 連結式使い捨て着用物品 - Google Patents

連結式使い捨て着用物品 Download PDF

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Publication number
WO2020066512A1
WO2020066512A1 PCT/JP2019/034765 JP2019034765W WO2020066512A1 WO 2020066512 A1 WO2020066512 A1 WO 2020066512A1 JP 2019034765 W JP2019034765 W JP 2019034765W WO 2020066512 A1 WO2020066512 A1 WO 2020066512A1
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WO
WIPO (PCT)
Prior art keywords
nonwoven fabric
microfibrous cellulose
cellulose aggregate
fibers
target portion
Prior art date
Application number
PCT/JP2019/034765
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English (en)
French (fr)
Japanese (ja)
Inventor
友記 岡田
勉 古川
Original Assignee
大王製紙株式会社
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Filing date
Publication date
Application filed by 大王製紙株式会社 filed Critical 大王製紙株式会社
Publication of WO2020066512A1 publication Critical patent/WO2020066512A1/ja

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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
    • 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

Definitions

  • the present invention relates to a connection type disposable wearing article such as a tape type disposable diaper.
  • a general connection-type disposable wearing article has a crotch portion including the center in the front-rear direction, a ventral portion extending forward from the center in the front-rear direction, and a back portion extending rearward from the center in the front-rear direction.
  • Has a wing portion extending to the left and right sides in the width direction from the crotch portion.
  • the wing portion has a connecting portion detachably connected to the outer surface of the abdominal portion, and the outer surface of the abdominal portion has a sheet-like target portion to which the connecting portion is connected. In use, the wing is turned from both sides of the waist to the outer surface of the abdomen, and the connection of the wing is connected to the target.
  • Such a connection type disposable wearing article is used not only for infants but also for nursing care (adult use) (for example, see Patent Document 1).
  • the connecting part of the connecting tape is more widely used when it is formed of hook material (male material) of a mechanical fastener (surface fastener) than it is formed of an adhesive layer.
  • a typical example of the target part in the latter case is that a base material made of a plastic film is sewn with a thread, and a part called a target tape in which a loop is formed on the base material with the thread is fixed to an outer surface of a ventral part. is there. In this case, the projection of the hook material of the connection tape is entangled with the loop of the target tape, so that the connection tape is connected to the target portion.
  • the outer surface of a recent connection-type disposable wearing article is generally formed of a nonwoven fabric (hereinafter referred to as an exterior nonwoven fabric) in order to obtain a tactile feel and appearance like a cloth.
  • an exterior nonwoven fabric a nonwoven fabric
  • the outer surface of the product covered with the exterior nonwoven fabric will have a different feel to the touch, lower air permeability, There is a problem that the position is restricted.
  • the nonwoven fabric is rich in flexibility and air permeability
  • the strength is not enough to connect the hook material of the connecting tape, and if the hook material is repeatedly attached or detached at the time of mounting, the fiber is extracted.
  • fluffing occurs, the connecting force of the hook material is reduced, and the appearance is deteriorated.
  • embossing the nonwoven fabric as disclosed in Patent Document 1 is one effective solution.
  • the coupling force to the target portion is weak due to a decrease in the contact area of the hook material. Or it may be felt by the wearer.
  • a main object of the present invention is to provide a new method which can prevent fluffing when repeating peeling and removing and improve the connecting force of a hook material.
  • connection type disposable wearing article which solved the above-mentioned subject is as follows.
  • a crotch portion including the center in the front-rear direction, a ventral portion extending forward from the center in the front-rear direction, and a back portion extending rearward from the center in the front-rear direction,
  • a connecting portion detachably connected to the outer surface of the abdominal portion
  • On the outer surface of the abdominal portion a target portion to which the connecting portion is connected,
  • the connecting portion is a hook material
  • the target portion is formed of a nonwoven fabric
  • the attachment portion of the microfibrous cellulose aggregate is repeatedly arranged at intervals in the front-rear direction, the width direction, or an oblique direction inclined with respect thereto,
  • constituent fibers of the nonwoven fabric are bonded via a microfibrous cellulose aggregate
  • a disposable disposable wearing article characterized
  • the microfibrous cellulose aggregate can be obtained by applying a dispersion of microfibrous cellulose to a nonwoven fabric and then drying.
  • the dispersion liquid of the microfibrous cellulose penetrates between the fibers of the nonwoven fabric, and after drying, the microfibrous cellulose aggregate is firmly attached, and the constituent fibers of the nonwoven fabric are firmly connected via the microfibrous cellulose aggregate. Is combined with Therefore, when the attached portion of such a microfibrous cellulose aggregate is repeatedly arranged at intervals on the nonwoven fabric of the target portion, the fiber is extracted even if the hook material is repeatedly attached or detached. It becomes harder and less fuzzy.
  • the adhesion portion of the microfibrous cellulose aggregate can be formed by applying and drying the dispersion, it is not necessary to form a concave portion on the surface of the nonwoven fabric of the target portion. For this reason, it is possible to prevent a decrease in the connecting force of the hook member caused by the concave portion, which is generated when the concave portion is formed by embossing.
  • the microfibrous cellulose aggregate has an odor adsorbing property and a moisture absorbing property, it also exhibits a deodorizing effect and a moisture absorbing effect.
  • the attachment portion of the microfibrous cellulose aggregate may be arranged in any pattern, but when provided in a striped pattern as in this embodiment, it is possible to firmly bond the constituent fibers of the nonwoven fabric. It is preferable because it is possible.
  • ⁇ Third aspect> Absorber built in the area including the crotch, A liquid-permeable top sheet covering the front side of the absorber, A liquid impermeable sheet covering the back side of the absorber, Covering the back side of the liquid impermeable sheet, having an exterior nonwoven fabric constituting the outer surface of the product,
  • the nonwoven fabric of the target portion is the exterior nonwoven fabric
  • the exterior nonwoven fabric is an air-through nonwoven fabric having a fiber length of 1 to 51 mm, a fineness of 1.6 to 2.3 dtex, and a basis weight of 20 to 25 g / m 2 .
  • the distance between the adhering portions of the microfibrous cellulose aggregate in the orientation direction of the fibers of the exterior nonwoven fabric is 5 to 20 mm;
  • the exterior nonwoven fabric is preferably a short fiber air-through nonwoven fabric.
  • fluffing is likely to occur when the hook agent is repeatedly attached and detached, and the coupling force is likely to be reduced.
  • the hook material At the adhering part of the microfibrous cellulose aggregate, the hook material is hardly connected at all in any way (however, when compared comprehensively with the same area, the connection force is less reduced than the embossed concave portion) .
  • the microfibrous cellulose aggregate since the microfibrous cellulose aggregate is hard, it affects the touch. Therefore, it is preferable that the attached amount of the microfibrous cellulose aggregate decreases from the back side to the front side. Thereby, it is possible to suppress a decrease in the connecting force of the hook material to the attachment portion of the microfibrous cellulose aggregate and to suppress the surface from becoming hard to the touch.
  • the hook material At the adhering part of the microfibrous cellulose aggregate, the hook material is hardly connected at all in any way (however, when compared comprehensively with the same area, the connection force is less reduced than the embossed concave portion) .
  • the microfibrous cellulose aggregate since the microfibrous cellulose aggregate is hard, it affects the touch. Therefore, it is preferable not to have the microfibrous cellulose aggregate exposed on the surface of the nonwoven fabric of the target portion as in this embodiment. Thereby, it is possible to suppress a decrease in the connecting force of the hook material to the attachment portion of the microfibrous cellulose aggregate and to suppress the surface from becoming hard to the touch.
  • advantages such as prevention of fluffing during repeated peeling and improvement of the connecting force of the hook material can be achieved.
  • FIG. 2 is a plan view showing the outer surface of the tape-type disposable diaper in a state where the diaper is developed.
  • FIG. 6 is a sectional view taken along line 6-6 of FIG.
  • FIG. 7 is a sectional view taken along line 7-7 of FIG. 1.
  • 9A is a sectional view taken along line 8-8 of FIG. 1
  • FIG. 9B is a sectional view taken along line 9-9 of FIG.
  • FIG. 5 is a sectional view taken along line 5-5 of FIG. 1. It is sectional drawing of a target part.
  • FIG. 4 is an enlarged plan view of a portion including a target portion.
  • FIG. 4 is an enlarged plan view of a portion including a target portion.
  • FIG. 2 is a plan view showing the outer surface of the tape-type disposable diaper in a state where the diaper is developed.
  • FIG. 2A is an enlarged plan view of a target portion
  • FIG. 2B is a cross-sectional view of a portion including the target portion.
  • FIG. 2 is a plan view showing the outer surface of the tape-type disposable diaper in a state where the diaper is developed.
  • FIG. 2A is an enlarged plan view of a target portion
  • FIG. 2B is a cross-sectional view of a portion including the target portion.
  • It is a perspective view showing (a) the connection tape for peel strength tests, and (b) the connection tape for shear strength tests.
  • It is a side view which shows the test procedure of (a) peeling strength test and (b) shear strength test.
  • It is an enlarged photograph of the adhesion part of a microfibrous cellulose aggregate.
  • FIGS. 1 to 6 show an example of a tape-type disposable diaper, in which reference symbol W indicates the entire width of the diaper excluding the connection tape, and reference symbol L indicates the entire length of the diaper.
  • the dot pattern portion indicates a hot melt adhesive as a joining means for joining the constituent members located on the front side and the back side.
  • the hot melt adhesive is formed by a known method such as slot coating, continuous linear or dotted line bead coating, spiral or Z-shaped spray coating, or pattern coating (transfer of hot melt adhesive by letterpress method). Can be applied.
  • a hot melt adhesive can be applied to the outer peripheral surface of the elastic member, and the elastic member can be fixed to the adjacent member.
  • hot-melt adhesive examples include EVA-based, adhesive rubber-based (elastomer-based), olefin-based, and polyester / polyamide-based adhesives, but can be used without any particular limitation.
  • a joining means for joining the constituent members means by material welding such as heat sealing or ultrasonic sealing can be used.
  • This tape-type disposable diaper has a crotch portion including the center in the front-back direction LD, a ventral portion F extending forward from the center in the front-back direction LD, and a back portion B extending rearward from the center in the front-back direction LD. doing.
  • the tape-type disposable diaper includes an absorbent body 56 incorporated in a range including the crotch portion, a liquid-permeable top sheet 30 covering the front side of the absorbent body 56, and a liquid impermeable covering the back side of the absorbent body 56. It has a sheet 11 and an exterior nonwoven fabric 12 that covers the back side of the liquid impermeable sheet and constitutes the outer surface of the product.
  • the absorber 56 is a portion that absorbs and retains the excreted liquid, and can be formed by an aggregate of fibers.
  • the fiber aggregate include a filament aggregate obtained by spreading a tow (fiber bundle) of synthetic fibers such as cellulose acetate, as necessary, in addition to fibers obtained by stacking short fibers such as cotton-like pulp and synthetic fibers.
  • the fiber basis weight can be, for example, about 100 to 300 g / m 2 when stacking cottony pulp or short fibers, and about 30 to 120 g / m 2 for filament aggregates, for example. Can be.
  • the fineness of the synthetic fiber is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex.
  • the filament may be a non-crimped fiber, but is preferably a crimped fiber.
  • the degree of crimp of the crimped fiber can be, for example, about 5 to 75 pieces, preferably about 10 to 50 pieces, more preferably about 15 to 50 pieces per 2.54 cm. Further, crimped fibers uniformly crimped can be used.
  • the absorber 56 can contain superabsorbent polymer particles in a part or the whole thereof.
  • the superabsorbent polymer particles include “powder” in addition to “particles”.
  • the superabsorbent polymer particles those used for this type of absorbent article can be used as they are.
  • the particle size of the superabsorbent polymer particles is not particularly limited. When sieving using a 180 ⁇ m standard sieve (JIS Z8801-1: 2006) (shaking for 5 minutes), the percentage of particles remaining on the 500 ⁇ m standard sieve is 30% by weight or less, and the 180 ⁇ m standard sieve is used. It is desirable that the ratio of the particles remaining on the top is 60% by weight or more.
  • the material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption of 40 g / g or more are preferred.
  • the superabsorbent polymer particles include starch-based, cellulosic and synthetic polymer-based particles, such as starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, and crosslinking of sodium carboxymethyl cellulose. Or an acrylic acid (salt) polymer can be used.
  • the shape of the superabsorbent polymer particles is preferably in the form of a commonly used powder, but other shapes can also be used.
  • the superabsorbent polymer particles those having a water absorption rate of 70 seconds or less, particularly 40 seconds or less are suitably used. If the water absorption speed is too slow, the so-called reversion in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56 easily occurs.
  • the superabsorbent polymer particles those having a gel strength of 1000 Pa or more are preferably used. Thereby, even when the bulky absorber 56 is used, the sticky feeling after absorbing the liquid can be effectively suppressed.
  • the basis weight of the superabsorbent polymer particles can be appropriately determined according to the absorption required for the use of the absorber 56. Therefore, although it cannot be said unconditionally, it can be usually 50 to 350 g / m 2 .
  • the absorber 56 can be incorporated as an absorbing element 50 wrapped in a wrapping sheet 58.
  • tissue paper particularly crepe paper, nonwoven fabric, polylaminated nonwoven fabric, a sheet with small holes, or the like can be used.
  • a sheet from which the superabsorbent polymer particles do not escape is desirable.
  • hydrophilic SMMS spunbond / meltblown / meltblown / spunbond
  • polypropylene, polyethylene / polypropylene or the like can be used as the material.
  • the fiber basis weight is preferably 5 to 40 g / m 2 , particularly preferably 10 to 30 g / m 2 .
  • the packaging sheet 58 has a structure in which the entirety of the absorber 56 is wrapped by a single sheet, or a plurality of upper and lower sheets may be used to wrap the entirety of the absorber 56. 58 can also be omitted.
  • the top sheet 30 has liquid permeability, and for example, a perforated or non-porous nonwoven fabric, a porous plastic sheet, or the like can be used.
  • the top sheet 30 extends from the front end to the rear end of the product in the front-rear direction, and extends laterally beyond the absorber 56 in the width direction WD.
  • the starting point of the rising gathers 60 described later is closer than the side edge of the absorber 56.
  • the top sheet 30 can be appropriately deformed, for example, the width of the top sheet 30 is made shorter than the entire width of the absorber 56.
  • An intermediate sheet (also called “second sheet”) 40 can be provided on the back side of the top sheet 30 to prevent the liquid that has passed through the top sheet 30 from returning.
  • the intermediate sheet 40 can be omitted.
  • the intermediate sheet 40 various nonwoven fabrics can be suitably used, and particularly a bulky air-through nonwoven fabric can be suitably used. It is preferable to use a conjugate fiber having a core-sheath structure for the air-through nonwoven 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, more preferably 25 ⁇ 60g / m 2.
  • the thickness of the raw material fiber of the nonwoven fabric is preferably 2.0 to 10 dtex.
  • the intermediate sheet 40 in the illustrated example is arranged at the center shorter than the width of the absorber 56, but may be provided over the entire width.
  • the intermediate sheet 40 may be provided over the entire length of the diaper, or may be provided only in the intermediate portion including the excretion position as shown in the figure.
  • the liquid impermeable sheet 11 is not particularly limited, but preferably has moisture permeability.
  • a microporous material obtained by kneading an inorganic filler in an olefin-based resin such as polyethylene or polypropylene, forming a sheet, and then stretching the sheet in a uniaxial or biaxial direction.
  • a sheet can be suitably used.
  • a sheet having a non-woven fabric as a base material and having improved waterproofness can be used as the liquid impermeable sheet 11.
  • the liquid impermeable sheet 11 preferably extends over the same or a wider range as the absorber 56 in the front-rear direction LD and the width direction WD, but if necessary, such as when other water shielding means is present,
  • the structure which does not cover the end part of the absorber 56 in the front-back direction LD and the width direction WD can also be used.
  • the exterior nonwoven fabric 12 covers the entire back side of the liquid impermeable sheet 11 so that the outer surface of the product has a cloth-like appearance.
  • the nonwoven fabric may be used alone or in a plural number. In the latter case, it is preferable to bond the nonwoven fabrics together with a hot melt adhesive or the like.
  • the constituent fibers have a fineness of 1.6 to 2.3 dtex, a basis weight of 15 to 25 g / m 2 , and a thickness of 0.3 to 0.8 mm.
  • rising gathers 60 that stand on the skin side of the wearer are provided on both sides in the width direction WD of the surface. Is preferable. Of course, the rising gathers 60 can be omitted.
  • the rising gather 60 in the illustrated example includes 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-back direction LD. ing.
  • a gather sheet 62 a water-repellent nonwoven fabric can be used, and as the gather elastic member 63, thread rubber or the like can be used.
  • a plurality of elastic members may be provided, or one elastic member may be provided.
  • the inner surface of the gather sheet 62 has a joining start end in the width direction WD on the side portion of the top sheet 30, and a portion outside in the width direction from the joining start end is an inner surface of each side flap portion SF, that is, in the illustrated example, liquid impermeable.
  • the side surface of the non-woven sheet 11 and the side portion of the exterior nonwoven fabric 12 located on the outer side in the width direction are joined by a hot melt adhesive or the like.
  • the inner side in the width direction from the joining start end of the rising gathers 60 is fixed on the top sheet 30 at both ends in the front-rear direction of the product, but the portion between them is a non-fixed free portion.
  • the elastic member 63 rises due to the contracting force and comes into close contact with the body surface.
  • the tape-type disposable diaper of the illustrated example has a pair of end flap portions EF that do not have the absorber 56 and extend to the front side and the rear side of the absorber 56, respectively, and are located laterally beyond both side edges of the absorber 56. It has a pair of side flap portions SF that do not have the absorber 56 and extend.
  • the side flap portion SF may be made of a material (exterior nonwoven fabric 12 or the like) continuous from the portion having the absorber 56 as shown in the illustrated example, or may be formed by attaching another material.
  • a side elastic member 64 made of an elongated elastic member such as thread rubber is fixed in a state of being extended along the front-back direction LD.
  • the leg-surrounding elastic member 64 is provided between the gather sheet 62 and the liquid-impermeable sheet 11 on the outer side in the width direction near the joining start end of the joining portion of the gather sheet 62 as shown in the illustrated example. It can also be provided between the liquid impermeable sheet 11 and the exterior nonwoven fabric 12 in SF.
  • a plurality of leg surrounding elastic members 64 may be provided on each side, or only one leg surrounding elastic member 64 may be provided on each side.
  • the plane gather is a portion where the contraction force of the side elastic member 64 acts (a portion where the side elastic member 64 is shown in the drawing). Therefore, in addition to the form in which the side elastic member 64 exists only in the portion of the flat gather, the side elastic member 64 exists on the front side, the rear side, or both sides of the flat gather, but the side elastic member 64 exists in other than the portion of the flat gather.
  • a contraction force acts on a portion other than the flat gather.
  • the back portion B has a wing portion WP extending outward in the width direction WD from the crotch portion M.
  • the abdominal portion F also has a wing portion WP extending outward in the width direction WD from the crotch portion M.
  • These wing portions WP can be formed by other members than the other portions.
  • the side flap portion SF as shown in the figure, by cutting the middle in the front-rear direction LD at the side portion of the side flap portion SF, the concave shape from the side edge of the crotch portion M to the lower edge 71 of the wing portion is formed. It is preferable that the edge 70 is formed, and as a result, the wing portion WP is formed because manufacturing is easy.
  • connection tape 80 that is detachably connected to the outer surface of the abdomen portion F.
  • the connecting tape 80 is turned from both sides of the waist to the outer surface of the abdominal portion F, and the connecting portion 83 of the connecting tape 80 is connected to an appropriate position on the outer surface of the abdominal portion F.
  • connection tape 80 includes a base end portion 81 fixed to the wing portion WP, a sheet base material 80S forming a main body portion 82 extending from the base end portion 81, A connecting portion 83 is provided at an intermediate portion of the main body portion 82 in the width direction WD of the base material 80S and is connected to the abdominal portion F.
  • the base end 81 side of the connection part 83 is a non-connection part 84 not connected to the abdominal part F, and the opposite side is a knob part 85.
  • the non-connection portion 84 and the knob portion 85 are formed only of the sheet base material 80S that forms the main body portion 82.
  • the connecting portion 83 is made of a hook material (male material) of a mechanical fastener (surface fastener).
  • the hook member has a large number of engaging projections on its connection surface.
  • the shape of the engaging projection is (A) L-shaped, (B) J-shaped, (C) mushroom-shaped, (D) There are a T-shape, (E) a double J-shape (a shape in which J-shapes are joined back to back) and the like, but any shape may be used.
  • a non-woven fabric, a plastic film, a poly-laminate non-woven fabric, paper or a composite material thereof can be used, and the fineness is 1.0 to 3.5 dtex.
  • Spunbond nonwoven fabric, air-through nonwoven fabric, or spunlace nonwoven fabric having a basis weight of 60 to 100 g / m 2 and a thickness of 1 mm or less is preferred.
  • the connecting portion 83 in the illustrated example is provided on the sheet base 80S of the connecting tape 80 protruding from the wing portion WP, but may be provided directly on the wing portion WP.
  • the target portion 20 to which the connecting portion 83 of the connecting tape 80 is connected is provided at the connecting portion of the connecting tape 80 in the abdominal portion F.
  • the target portion 20 is formed.
  • the appropriate portion of the exterior nonwoven fabric 12 may be used as the target portion 20 and the engaging projections of the hook material may be entangled with the fibers of the exterior nonwoven fabric 12 and connected.
  • the target part 20 can also be formed by sticking the nonwoven fabric 21 for a target to the outer surface of the abdominal part F like the example shown in FIG. 9 and FIG.
  • the nonwoven fabric 21 for the target is not particularly limited.
  • a long-fiber nonwoven fabric having a fineness of 5 to 10 dtex, a basis weight of 25 to 40 g / m 2 , and a thickness of about 0.3 to 0.8 mm is preferably used. Can be.
  • a display sheet 29 on which an indication of a connecting position such as a scale 29 i is printed can be interposed on the back side of the nonwoven fabric 21 of the target portion 20.
  • the user can connect the connecting portion 83 to the nonwoven fabric 21 of the target portion 20 using the scale 29i or the like that can be seen through the nonwoven fabric 21 of the target portion 20 as a guide.
  • the scale 29i is a mark indicating the position in the width direction WD
  • a plurality of linear indices along the front-rear direction LD are provided at predetermined intervals in the width direction WD, or Arabic numerals as shown in FIG.
  • the display sheet 29 can be formed by printing on paper or nonwoven fabric.
  • the attachment portions 23 of the microfibrous cellulose aggregates 22 are repeatedly arranged on the nonwoven fabric 21 of the target portion 20 at intervals in the front-back direction LD.
  • the constituent fibers of the nonwoven fabric 21 are bonded via the microfibrous cellulose aggregate 22.
  • the microfibrous cellulose refers to fine cellulose fibers or bundles thereof extracted from plants such as pulp, and generally refers to fibrous cellulose having an average fiber width of nano size (1 to 1000 nm or less), and an average fiber width ( Those having a median diameter of 100 nm or less (generally referred to as cellulose nanofibrils (CNF)) are preferable, and those having a median diameter of 10 to 60 nm are particularly preferable.
  • the average fiber width of the microfibrous cellulose can be measured by the following method.
  • the adhesion portion 23 of the microfibrous cellulose aggregate 22 is formed by applying a microfibrous cellulose dispersion dispersed in a dispersion such as water to the nonwoven fabric 21 of the target portion 20 and drying the dispersion. Can be manufactured.
  • the adhesion portion 23 of the microfibrous cellulose aggregate 22 is formed by applying the microfibrous cellulose dispersion, the microfibrous cellulose dispersion permeates between the fibers of the nonwoven fabric 21 as shown in FIGS. After drying, the fibrous cellulose aggregates 22 are firmly adhered to the surfaces of the individual fibers, and the fibers are firmly connected to each other at the intersections and adjacent portions of the constituent fibers of the nonwoven fabric 21 via the fibrous cellulose aggregates 22.
  • the attachment portions 23 of the microfibrous cellulose aggregate 22 are repeatedly arranged at intervals on the nonwoven fabric 21 of the target portion 20, even if the hook material is repeatedly attached or detached, the fibers may be removed. Is difficult to be extracted, and it is difficult to fluff.
  • the adhesion portion 23 of the microfibrous cellulose aggregate 22 can be formed by applying and drying the dispersion, it is not necessary to form a concave portion on the surface of the nonwoven fabric 21 of the target portion 20. For this reason, it is possible to prevent a decrease in the connecting force of the hook member caused by the concave portion, which is generated when the concave portion is formed by embossing.
  • the microfibrous cellulose aggregate 22 has an odor-adsorbing property and a moisture-absorbing property, the deodorizing effect and the moisture-absorbing effect are also exhibited.
  • the concentration (mass / volume) of the microfibrous cellulose dispersion may be 0.1 to 10%. More preferably, it is 1.0 to 5.0%, particularly preferably 1.5 to 3.0%.
  • the B-type viscosity (60 rpm, 20 ° C) of the microfibrous cellulose dispersion is, for example, 700 cps or less, preferably 200 cps or less, more preferably 50 cps or less.
  • Pulp fibers usable for the production of microfibrous cellulose include chemical pulp such as hardwood pulp (LBKP) and softwood pulp (NBKP), bleached thermomechanical pulp (BTMP), stone ground pulp (SGP), and pressurized stone ground.
  • Deinked manufactured paper pulp and waste paper pulp Treated deinked pulp may be used alone or in combination of two or more as long as the desired effect is not impaired. Further, a pulp fiber obtained by subjecting the pulp fiber to a chemical treatment such as carboxymethylation may be used.
  • Examples of the method for producing microfibrous cellulose include mechanical methods such as a high-pressure homogenizer method, a microfluidizer method, a grinder grinding method, a bead mill freeze-grinding method, and an ultrasonic defibration method, but are not limited to these methods. Not something.
  • the formation of nanofibers is promoted by a combination of a TEMPO oxidation treatment, a phosphoric esterification treatment, an acid treatment and the like.
  • the attachment portions 23 of the microfibrous cellulose aggregates 22 are arranged in any pattern as long as they are repeatedly arranged at intervals in the front-back direction LD, the width direction WD, or an oblique direction inclined with respect to these. Is also good. Therefore, for example, as shown in FIG. 8 (b), the attachment portions of the dot-like microfibrous cellulose aggregates such as circles and polygons are dispersed in a staggered arrangement (illustration example), a matrix arrangement (not shown), and the like. It can also be provided in the form of dots.
  • the attachment portion 23 of the microfibrous cellulose aggregate 22 has a horizontal stripe arrangement in which a plurality of linear attachment portions 23 along the width direction WD are arranged at intervals in the front-rear direction LD. As shown in ()), a plurality of linear attachment portions 23 along the front-back direction LD may be arranged in a vertical stripe pattern at intervals in the width direction WD.
  • the attachment portion 23 of the microfibrous cellulose aggregate 22 is formed by the attachment portion 23 of the linear microfibrous cellulose aggregate 22 along the front-back direction LD and the linear microfibrous shape along the width direction WD.
  • the attachment portion 23 of the microfibrous cellulose aggregate 22 may be made continuous in a linear manner, it may be made continuous in a straight line or in a curved or wavy line.
  • the size of the attachment portion 23 of the microfibrous cellulose aggregate 22 can be determined as appropriate.
  • the diameter 23d (the length of the longest portion) of the attachment portion 23 of the microfibrous cellulose aggregate 22 is 1.0 to 4.0 mm, especially
  • the distance x1, y1 between the centers (or the centers of gravity) of the rows adjacent to the width direction WD and the front-back direction LD is preferably 5 to 25 mm, and more preferably 15 to 10 mm.
  • the line width 23w of the attachment portion 23 of the microfibrous cellulose aggregate 22 is 1.0 to 4.0 mm, especially 2.
  • the distance x2, y2 between the adhering portions 23 is preferably 5 to 30 mm, and more preferably 10 to 20 mm.
  • the line width of the attachment portion 23 of the microfibrous cellulose aggregate 22 is 1.0 to 4.0 mm, particularly 2.0 to 4.0 mm.
  • the distance between the lattices (the distance between the adhering portions 23 of the parallel microfibrous cellulose aggregates 22) is preferably 5 to 30 mm, and more preferably 10 to 20 mm.
  • the adhering portion 23 that is continuous in the direction intersecting with the orientation direction of the fibers of the nonwoven fabric 21 of the target portion 20 is oriented in the direction of orientation of the fibers of the nonwoven fabric 21 of the target portion 20. It is preferable that the stripe pattern is shorter than the fiber length of the nonwoven fabric 21 of the portion 20 and arranged at intervals of 5 mm or more.
  • the direction of fiber orientation of the nonwoven fabric 21 is the front-back direction LD, and the attachment portions 23 of the microfibrous cellulose aggregate 22 are formed in a horizontal stripe pattern, and are adjacent to each other.
  • the distance y2 between the attachment portions 23 in the front-rear direction LD can be shorter than the fiber length of the exterior nonwoven fabric 12 and 5 mm or more.
  • the exterior nonwoven fabric 12 is preferably a short fiber air-through nonwoven fabric having a fiber length of 1 to 51 mm, a fineness of 1.6 to 2.3 dtex, and a basis weight of 20 to 25 g / m 2 . Then, when such an exterior nonwoven fabric 12 itself is used as the target portion 20 as shown in FIG. 2 and the like, the distance between the attachment portions 23 of the microfibrous cellulose aggregates 22 in the orientation direction of the fibers of the exterior nonwoven fabric 12 is determined. A thickness of 5 to 20 mm is preferable because the fibers are less likely to be pulled out due to the detachment of the hook material and become less fluffy.
  • microfibrous cellulose aggregate 22 adheres to at least a part of the nonwoven fabric 21 of the target portion 20 in the thickness direction, as shown in FIG. They may be attached to only a part of the thickness direction, may be attached to the entire thickness direction as shown in FIGS. 7A, 7B, and 7D, or may be mixed. Further, even if the amount of the microfibrous cellulose aggregate 22 attached is constant in the thickness direction of the nonwoven fabric 21 as shown in FIG. 7 (a), as shown in FIGS. 7 (b), (c) and (d), They may be changed or they may be mixed.
  • the microfibrous cellulose aggregate 22 may coat the entire circumferential direction of each fiber, or may be coated on the application side F1 of each fiber as shown in FIG. A large amount may not be attached to the non-coating side F2. Further, as shown in FIG. 15, the microfibrous cellulose aggregate 22 may adhere almost continuously along the continuation direction of the fibers, or may sparsely adhere in the continuation direction of the fibers. It is preferable that the number of the microfibrous cellulose aggregates 22 that do not bond the fibers be small because the nonwoven fabric becomes flexible.
  • the hook material is hardly connected at all to some extent (however, when compared comprehensively with the same area, the connection force decreases less than the concave portion formed by embossing). Become).
  • the microfibrous cellulose aggregate 22 is hard, it affects the touch. Therefore, it is preferable that the attached amount of the microfibrous cellulose aggregate 22 decreases from the back side to the front side as shown in FIGS. 7B and 7C. Thereby, it is possible to suppress a decrease in the coupling force of the hook material to the attachment portion 23 of the microfibrous cellulose aggregate 22, and to suppress the surface from being hardened. It is more preferable that the attachment portion 23 of the microfibrous cellulose aggregate 22 does not have the microfibrous cellulose aggregate 22 exposed on the surface of the nonwoven fabric 21 of the target portion 20 as shown in FIG.
  • the uneven distribution of the microfibrous cellulose aggregate 22 in the thickness direction and the change in the amount of adhesion are determined by the application of the microfibrous cellulose dispersion from either the front or back of the nonwoven fabric 21, and the amount of application and the degree of permeability.
  • the attachment portion 23 of the microfibrous cellulose aggregate 22 shown in FIGS. 7B and 7C can be formed by applying an appropriate amount of the microfibrous cellulose dispersion on the back surface of the nonwoven fabric 21.
  • the attachment portion 23 of the microfibrous cellulose aggregate 22 shown in (d) can be formed by applying an appropriate amount of the microfibrous cellulose dispersion to the surface of the nonwoven fabric 21.
  • the content of microfibrillated cellulose in the attachment portion 23 of the microfibrous cellulose assembly 22 is preferably to be 2 ⁇ 7g / m 2 approximately, and more preferably particularly in 2 ⁇ 5g / m 2 approximately.
  • the attachment portion 23 of the microfibrous cellulose aggregate 22 is colored in a different color from the nonwoven fabric 21 of the target portion 20 so that the range of the target portion 20 can be easily recognized. Furthermore, by forming the colored attachment portion 23 different from the nonwoven fabric 21 of the target portion 20 in a scale (for example, FIG. 8A), it is possible to use the target portion 20 as a reference for the connection position. Such a colored attachment portion 23 can be formed by adding a coloring agent such as a dye to a dispersion of microfibrous cellulose.
  • Non-woven fabric As the nonwoven fabric in the above description, a known nonwoven fabric can be appropriately used depending on the site and purpose.
  • the constituent fibers of the nonwoven fabric include olefin-based synthetic fibers such as polyethylene and polypropylene, polyester-based and polyamide-based synthetic fibers (including composite fibers such as core-sheaths as well as monocomponent fibers), as well as regeneration of rayon and cupra. Fibers, natural fibers such as cotton, and the like can be selected without particular limitation, and these can be used in combination. In order to increase the flexibility of the nonwoven fabric, it is preferable that the constituent fibers are crimped fibers.
  • non-woven fabrics generally have short fiber non-woven fabrics, long fiber non-woven fabrics, spun-bonded non-woven fabrics, melt blown non-woven fabrics, spun-lace non-woven fabrics, thermal bond (air-through) non-woven fabrics, and needle punches, depending on the fiber length, sheet forming method, fiber bonding method, and laminated structure.
  • Nonwoven fabrics, point-bonded nonwoven fabrics, laminated nonwoven fabrics (SMS nonwoven fabrics having a melt blown layer between spunbond layers, SMMS nonwoven fabrics, and the like) and the like can be used, and any of these nonwoven fabrics can be used.
  • the nonwoven fabric 21 of the target portion 20 is a nonwoven fabric 21 of a hydrophilic fiber because the microfibrous cellulose aggregate 22 is more easily and thinly adhered to the fibers of the nonwoven fabric 21.
  • Example 1 As shown in FIGS. 1 to 6 and FIG. 7 (d), a tape-type disposable diaper in which the attachment portion 23 of the microfibrous cellulose aggregate 22 was formed in a horizontal stripe on the exterior nonwoven fabric 12 was produced. More specifically, first, a blank sample having no attached portion 23 of the microfibrous cellulose aggregate 22 was prepared.
  • the exterior nonwoven fabric 12 was an air-through nonwoven fabric having a fiber length of 30 to 45 mm, a fineness of 1.5 dtex, and a basis weight of 20 g / m 2 .
  • the dimensions of the connecting portion 83 (commercially available hook material) of the connecting tape 80 are the maximum value of the dimension in the front-rear direction LD 26 mm, the minimum value of the dimension in the front-rear direction LD 24 mm, the maximum value in the width direction WD 21 mm, and the width direction WD was set to a minimum value of 19 mm, the target portion 20 (the circumscribed rectangle of the group of attachment portions 23 of the microfibrous cellulose aggregate 22) was rectangular, and the size was 35 mm in the front-rear direction ⁇ 180 mm in the width direction.
  • microfibrous cellulose dispersed water is applied in a striped form from the outer surface to the exterior nonwoven fabric 12 of this blank sample, and then dried.
  • the dimension (line width 23w) of the front-back direction LD (line width 23w) is 5 mm.
  • the adhesion portion 23 of the microfibrous cellulose aggregate 22 in the form of a horizontal stripe having an interval y2 of 5 mm in the front-back direction LD was formed (see FIG. 2).
  • the application amount of the application portion of the microfibrous cellulose aggregate 22 was 3.57 g / m 2 .
  • the content of the fibrous cellulose in the adhesion portion 23 after drying was 0.07 g / m 2 .
  • the dispersion water of the microfibrous cellulose used contained microfibrous cellulose having an average fiber width of 26 nm at a concentration (mass / volume) of 2%.
  • Sample 2 was prepared in the same manner as Sample 1, except that the distance between the adjacent attachment portions 23 in the front-back direction LD was 10 mm.
  • connection tape 91 for the peel strength test is attached to the surface of the target portion 20. The entire surface of the connecting portion 83 was connected.
  • the width direction WD of the sample and the width direction WD of the connection tape 80 are matched so that the orientation and the connection position of the connection tape 80 with respect to the exterior nonwoven fabric 12 are the same as when the product is used.
  • the connecting portion 83 of the connecting tape 80 was connected to one side in the direction WD. Thereafter, a roller having a mass of 2 kg ( ⁇ 0.1 kg) was reciprocated once in the width direction WD, and the connecting portion 83 was firmly connected to the target portion 20.
  • the gripper 90 of the connection tape 91 is sandwiched between the upper chuck C1 of the tensile tester and the width WD of the target unit 20 is inserted into the lower chuck C2 such that the width direction WD of the sample DP becomes the tensile direction.
  • the width direction WD of the sample and the width direction WD of the connection tape 80 are matched so that the orientation and the connection position of the connection tape 80 with respect to the exterior nonwoven fabric 12 are the same as when the product is used.
  • the connecting portion 83 of the connecting tape 80 was connected to one side in the direction WD. Thereafter, a roller having a mass of 2 kg ( ⁇ 0.1 kg) was reciprocated once in the width direction WD, and the connecting portion 83 was firmly connected to the target portion 20.
  • the gripping margin 90 of the connection tape 92 is sandwiched between the upper chuck C1 of the tensile tester and the width direction WD of the target portion 20 is inserted into the lower chuck C2 such that the width direction WD of the sample DP becomes the tensile direction.
  • the measurement was performed at a tensile speed of 500 mm / min with the other side of the sample sandwiched. This state is shown in FIG.
  • the first peak was read from the chart obtained by this measurement, and this was defined as the shear strength.
  • the shear strength was similarly measured by changing the connecting position of the connecting tape 92, and the average value of the measured values at the different connecting positions was obtained.
  • test results are shown in Table 1. From these results, by arranging the adhesion portions 23 of the microfibrous cellulose aggregates 22 on the target portion 20 at intervals, the connection strength is improved, and the connection strength is less reduced even after repeated peeling and peeling. It has been found that the above results are favorable.
  • the front-back direction means the direction (longitudinal direction) indicated by the symbol LD in the figure
  • the "width direction” means the direction (left-right direction) shown by WD in the figure.
  • “Deployed state” means a state in which it is flattened without shrinkage or loosening.
  • Elongation ratio means a value when the natural length is 100%. For example, an elongation ratio of 200% is synonymous with an elongation ratio of twice.
  • “Gel strength” is measured as follows. Artificial urine (urea: 2 wt%, sodium chloride: 0.8 wt%, calcium chloride dihydrate: 0.03 wt%, magnesium sulfate heptahydrate: 0.08 wt%, and ion-exchanged water: 97.09 wt%) To 49.0 g, 1.0 g of the superabsorbent polymer is added and stirred with a stirrer. The resulting gel is left in a thermo-hygrostat at 40 ° C. ⁇ 60% RH for 3 hours, then returned to room temperature, and the gel strength is measured with a card meter (Curdmeter-MAX @ ME-500, manufactured by I. techno Engineering Co.).
  • “Eye weight” is measured as follows. After pre-drying the sample or test piece, the sample or test piece is left in a test room or apparatus in a standard state (the test place is at a temperature of 23 ⁇ 1 ° C. and a relative humidity of 50 ⁇ 2%) to make it a constant weight state. Predrying refers to making a sample or a test piece a constant weight in an environment at a temperature of 100 ° C. Preliminary drying may not be performed for fibers having an official moisture content of 0.0%. A sample having a size of 100 mm x 100 mm is cut out from the test piece in a constant weight state using a template for sampling (100 mm x 100 mm). The weight of the sample is measured, multiplied by 100 to calculate the weight per square meter, and used as the basis weight.
  • -"Thickness is automatically measured using an automatic thickness measuring device (KES-G5 handy compression tester) under the conditions of a load: 0.098 N / cm 2 and a pressurized area: 2 cm 2 .
  • KS-G5 handy compression tester automatic thickness measuring device
  • Water absorption is measured according to JIS K7223-1996 “Test method for water absorption of superabsorbent resin”.
  • Water absorption rate is "time to end point” when JIS K7224-1996 "Test method for water absorption rate of super water absorbent resin” was performed using 2 g of super absorbent polymer and 50 g of physiological saline.
  • the direction of the fiber orientation of the non-woven fabric is the direction along which the fibers of the non-woven fabric follow, for example, a measurement method according to the fiber orientation test method based on the zero-distance tensile strength of TAPPI Standard Method T481, and the longitudinal and width directions. It can be determined by a simple measurement method that determines the fiber orientation direction from the tensile strength ratio.
  • test or measurement shall be performed in a test room or apparatus in a standard condition (the test location is 23 ⁇ 1 ° C and 50 ⁇ 2% relative humidity). I do.
  • dimensions of each part mean dimensions in the unfolded state, not the natural length state.
  • connection type disposable wearing article such as the tape type disposable diaper of the above example.
  • SYMBOLS 11 Liquid impermeable sheet, 12 ... Exterior nonwoven fabric, 80 ... Connection tape, 83 ... Connection part, 82 ... Body part, 81 ... Base end part, 20 ... Target part, 21 ... Nonwoven fabric, 22 ... Microfibrous cellulose aggregate Body, 23 ... Attachment part, 29 ... Display sheet, 29i ... Scale, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorptive element, 56 ... Absorptive body, 58 ... Packaging sheet, 60 ... Gathering gather, 62 ...

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PCT/JP2019/034765 2018-09-27 2019-09-04 連結式使い捨て着用物品 WO2020066512A1 (ja)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0526047U (ja) * 1991-02-19 1993-04-06 工業技術院長 生分解性束子
JPH11335960A (ja) * 1998-05-26 1999-12-07 Kao Corp 不織布及びそれを用いた吸収性物品
JP2003038213A (ja) * 2001-07-30 2003-02-12 Asahi Kasei Corp 係止材用長繊維不織布
JP2011099168A (ja) * 2009-11-04 2011-05-19 Oji Paper Co Ltd 乾式不織布及びその製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0526047U (ja) * 1991-02-19 1993-04-06 工業技術院長 生分解性束子
JPH11335960A (ja) * 1998-05-26 1999-12-07 Kao Corp 不織布及びそれを用いた吸収性物品
JP2003038213A (ja) * 2001-07-30 2003-02-12 Asahi Kasei Corp 係止材用長繊維不織布
JP2011099168A (ja) * 2009-11-04 2011-05-19 Oji Paper Co Ltd 乾式不織布及びその製造方法

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