WO2017056715A1 - 吸収性物品及びその製造方法 - Google Patents
吸収性物品及びその製造方法 Download PDFInfo
- Publication number
- WO2017056715A1 WO2017056715A1 PCT/JP2016/072989 JP2016072989W WO2017056715A1 WO 2017056715 A1 WO2017056715 A1 WO 2017056715A1 JP 2016072989 W JP2016072989 W JP 2016072989W WO 2017056715 A1 WO2017056715 A1 WO 2017056715A1
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- absorbent body
- absorber
- absorbent
- packaging sheet
- hot melt
- Prior art date
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- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/531—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad
- A61F2013/5315—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad with a tissue-wrapped core
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
- A61F2013/5349—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad being a tissue-wrapped core
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
- A61F13/537—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
- A61F2013/53765—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterized by its geometry
- A61F2013/53782—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterized by its geometry with holes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/539—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium characterised by the connection of the absorbent layers with each other or with the outer layers
- A61F2013/53908—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium characterised by the connection of the absorbent layers with each other or with the outer layers with adhesive
Definitions
- the present invention relates to an absorbent article characterized by an absorbent body packaging technique and a method for producing the same.
- absorbent articles such as disposable diapers and sanitary napkins
- a mixture of fibers such as pulp fibers and superabsorbent polymer particles as the absorbent, and such absorbents are manufactured and manufactured after production.
- absorbents are manufactured and manufactured after production.
- it is common to incorporate as an absorbent element in which a packaging sheet made of crepe paper or the like is wound.
- FIG. 17 to FIG. 19 show examples of manufacturing facilities and processes for conventional absorbent elements.
- this manufacturing equipment 100 first, a mixture of pulp fibers obtained by defibrating the pulp sheet 56F with the defibrator 101 and the superabsorbent polymer particles 56P is supplied from above the stacking drum 102 that is disposed sideways and rotationally driven. Is done.
- Absorber mold 102m having a rotational direction in the front-rear direction is formed in a concave shape on the outer peripheral surface of stacking drum 102, and a large number of suction holes are formed in the bottom surface of absorber mold 102m.
- the mixture of pulp fibers and superabsorbent polymer particles 56P is accumulated in the absorber mold 102m to form the absorber 56.
- the absorbent body 56 formed in the absorbent body mold 102m is positioned so as to face the continuous belt-shaped packaging sheet 58 supplied along the outer peripheral surface of the fiber stacking drum 102 by the rotation of the fiber stacking drum 102. Sometimes, it is removed from the mold and transferred (transferred) onto the packaging sheet 58.
- a first adhesive layer G1 is formed in advance on the transfer surface of the absorbent body 56 in the packaging sheet 58 by application of a hot melt adhesive M1, and the absorbent body 56 is formed on the packaging sheet 58 by the first adhesive layer G1. Glued. By sequentially performing these steps, the absorbent body 56 is intermittently supplied onto the packaging sheet 58 that is continuously transferred.
- the absorbent body 56 transferred onto the packaging sheet 58 is firmly pressed over the entire width of the absorbent body 56 by the opposed belt conveyor type press device 103.
- the wrapping sheet 58 has a width in the CD direction perpendicular to the MD direction (sheet transfer direction) wider than the absorbent body 56, and the absorbent body 56 is transferred onto the CD direction intermediate portion 58c.
- the second adhesive layer G2 is formed by application of the hot melt adhesive M2 over the entire width of the upper surface of the absorber 56, and thereafter, on both sides in the CD direction of the absorber 56 by a sailor not shown.
- the protruding both side portions 58s are folded back at positions along both side edges of the absorber 56 and bonded to the upper surface of the absorber 56, and both end portions in the CD direction are overlapped, and the hot melt adhesive M3 is applied in advance to the overlapping portions.
- the connecting portion 58c is formed by being bonded by the third adhesive layer G3 thus formed.
- a continuous body of absorbent elements 50 in which the absorbent body 56 is intermittently fixed in the MD direction is formed in the cylindrical continuous body of the packaging sheet 58 continuous in the MD direction.
- the continuum of absorbent elements 50 is intermittently cut in the MD direction in a state where other members are attached or in a state where other members are not attached, or in a cutting process for individual finished products.
- the individual absorbent elements 50 are obtained.
- Reversal is a phenomenon in which urine once absorbed by the absorber returns to the surface of the article again. If reversing easily, there is a problem that the skin becomes unnecessarily soiled with excrement, so that it is difficult to reverse. It is desired.
- the present inventor increases the content of the superabsorbent polymer particles in the absorber and increases the content of the superabsorbent polymer particles on the surface of the absorber so that the liquid content of excreta entering the absorber side I was studying a method to improve the reversal known as the phenomenon of returning to the side, but I found the following problem in the process.
- the stacking drum is integrated so that a large amount of high-absorbent polymer particles are contained on the bottom side of the absorber mold.
- the packaging sheet in this case, the upper and lower sides of the absorbent body are switched
- a connecting part will be formed.
- the portion having a high content of the superabsorbent polymer particles of the absorbent body is located on the connecting portion side of the packaging sheet, the absorption of the connecting portion of the packaging sheet may be insufficient. There is a possibility that the superabsorbent polymer particles detached from the body may leak out from the connecting portion of the packaging sheet to the skin side of the wearer.
- the main problem of the present invention is to reduce the risk of leakage of the superabsorbent polymer particles from the connecting portion of the packaging sheet while preventing reversal.
- the absorbent body comprises an absorbent element formed by packaging with a packaging sheet
- the absorber is a mixture of fibers and superabsorbent polymer particles
- the packaging sheet has an intermediate portion located on the front side of the absorbent body, and both side portions folded back from the intermediate portion to the back side of the absorbent body, and the leading ends of both side portions of the packaging sheet are the absorbent body.
- the connection part is formed by overlapping on the back side of
- the absorbent body has a total weight of the superabsorbent polymer particles larger than the total weight of the fibers, The content of the superabsorbent polymer particles in the absorber is increased stepwise or continuously from the back side to the front side.
- the content of the superabsorbent polymer particles in the absorber is high, and the content is increased stepwise or continuously from the back side to the front side, so that it has excellent reversal prevention properties. .
- the connecting portion of the packaging sheet is located on the back side of the absorbent body (that is, the side opposite to the high absorbent polymer particle content portion of the absorbent body), the bonding portion of the packaging sheet is not sufficiently adhered. Even if the superabsorbent polymer particles are difficult to leak out, and even if the superabsorbent polymer particles detached from the absorbent body leak out from the connecting portion of the packaging sheet, The risk of leaking to the skin side of the wearer is reduced.
- the overlapping part of the packaging sheet since the overlapping part of the packaging sheet has higher liquid retention than other parts, it may promote reversal when positioned on the front side of the absorber, but in the present invention, it is positioned on the back side of the absorber. Therefore, such a problem does not occur.
- the inner surface of the packaging sheet is bonded to the outer surface of the absorbent body through a hot melt adhesive as a whole of the portion facing the absorbent body.
- the amount of hot melt adhesive used to bond the packaging sheet and the absorbent body is greater in at least the width direction end areas on the back side of the absorbent body than on the front side of the absorbent body.
- the present inventor has discovered that the cause of promoting the ease of collapse of the absorbent body shape is hidden in the manufacturing process of the packaging sheet winding type absorbent element during the development process of the production facility. That is, in the case of a wrapping sheet-wrapping type absorption element, after transferring the absorbent body, the lower surface of the absorbent body and the intermediate portion of the packaging sheet are bonded to each other at the time of manufacture, and then both side portions of the packaging sheet are folded back to Therefore, the front and back sides of the absorber cannot be bonded under the same conditions.
- a hot melt adhesive that adheres to an absorbent body may cause absorption inhibition, and it is desirable that the amount used be the minimum necessary. Therefore, if there is a decrease in the unintentional adhesive force as described above, the shape maintaining action by the packaging sheet tends to decrease.
- the invention described in this section has been made by obtaining such knowledge, and the entire inner surface of the packaging sheet is opposed to the outer surface of the absorbent body via a hot melt adhesive.
- a hot melt adhesive for adhering the absorbent body and the packaging sheet at least in the width direction both ends on the back side (the side having the connecting part of the packaging sheet) of the absorbent body, the adhesive strength of which tends to be lower than the front side of the absorbent body.
- the superabsorbent polymer particles protruding from both sides of the absorbent body are wound up, and the absorbent sheet on the packaging sheet connecting portion side of the absorbent body is wound up.
- grains of the both sides in the surface by the side of the packaging sheet connection part of such an absorber are also adhere
- a constricted portion constricted in the center in the width direction is formed in the front-rear direction intermediate portion of the absorber,
- the region where the amount of hot melt adhesive used to bond the packaging sheet and the absorbent body is greater than the front side of the absorbent body is a region including the entire width direction of the constricted portion,
- the region where the amount of hot melt adhesive used to bond the packaging sheet and the absorbent body is large is By setting it as the area
- the hot melt adhesive it is common to form a constricted part in the absorbent body, but since that part is the most stressed part sandwiched between both legs, by configuring as described in this section, especially The collapse of the absorber can be effectively suppressed. It is also possible for the hot melt adhesive to effectively capture and fix the superabsorbent polymer particles that have spilled from the absorber into the constricted portion.
- a slit penetrating in the thickness direction extends in the front-rear direction in the intermediate portion in the width direction of the absorber,
- the region where the amount of hot melt adhesive used to bond the packaging sheet and the absorber is greater than the front side of the absorber is a region including both ends in the width direction of the slit,
- ⁇ Invention of Claim 6> In a region where the amount of hot melt adhesive used to bond the packaging sheet and the absorbent body is greater than the front side of the absorbent body, a plurality of hot melt adhesives differing in at least one of the application pattern and type of the hot melt adhesive The agent layer is laminated, On the front side of the absorbent body, the layer of the hot melt adhesive that bonds the packaging sheet and the absorbent body, the layer located closest to the packaging sheet among the plurality of hot melt adhesive layers, and the coating pattern and type are The same, The absorbent article according to any one of claims 2 to 5.
- a concave absorbent body mold having a rotational direction in the front-rear direction is formed on the outer peripheral surface, a number of suction holes are formed on the bottom surface of the absorbent body mold, and a stacking drum that is disposed sideways and rotationally driven is used.
- the absorber formed in the absorbent body mold is transferred to the intermediate portion in the width direction on the upper surface of the packaging sheet, and the portions located on both sides in the width direction of the absorbent body in the packaging sheet are folded back on the upper side of the absorber, The ends of the folded portions are overlapped to form a connecting portion, and the absorbent body is packaged with the packaging sheet by bonding the inner surface of the packaging sheet and the outer surface of the absorbent body via a hot melt adhesive.
- An absorbent element made of In the manufacturing method of an absorbent article which manufactures an absorbent article using this manufactured absorption element,
- the absorbent body is such that the total weight of the superabsorbent polymer particles is larger than the total weight of the fibers,
- the accumulation is performed so that the content of the superabsorbent polymer particles in the absorber formed in the absorber mold increases stepwise or continuously from the bottom side to the inlet side of the absorber mold.
- the connecting portion of the packaging sheet is incorporated in the absorbent article so as to be on the back side of the absorbent body in the absorbent article.
- an absorbent article having the above-described advantages can be manufactured. Further, in the manufacturing method described in this section, since accumulation is performed by containing a large amount of superabsorbent polymer particles on the inlet side of the absorber type in the stacking drum, the superabsorbent polymer particles are attracted to the absorber type suction holes. Problems such as clogging are less likely to occur.
- the absorber since the accumulation is performed such that the content of the superabsorbent polymer particles increases stepwise or continuously from the bottom side of the absorber type toward the inlet side in the pile drum, the absorber When the hot melt adhesive is applied to the upper surface of the resin, the content of the superabsorbent polymer particles becomes lower toward the upper surface side of the absorber, and the superabsorbent polymer particles are less likely to be scattered.
- FIG. 3 is a cross-sectional view illustrating a layer configuration of a 3-3 cross section in FIG. 1.
- FIG. 4 is a cross-sectional view illustrating a layer configuration of a 4-4 cross section in FIG. 1.
- FIG. 5 is a cross-sectional view illustrating a layer configuration of a 5-5 cross section in FIG. 1. It is a perspective view of a pants type disposable diaper.
- FIG. 3 is a cross-sectional view showing a layer configuration of a cross section corresponding to a 3-3 cross section in FIG. 1.
- FIG. 4 is a cross-sectional view showing a layer configuration of a cross section corresponding to the 4-4 cross section of FIG. 1. It is a top view of the unfolding state which shows the outer surface of a pants type disposable diaper.
- FIG. 10 is a cross-sectional view illustrating a layer configuration of a 6-6 cross section in FIG. 9.
- FIG. 3 is a cross-sectional view showing a layer configuration of a cross section corresponding to a 3-3 cross section in FIG. 1.
- FIG. 1 to 6 show an example of a pants-type disposable diaper.
- the dotted pattern in the cross-sectional view shows an adhesive as a joining means for joining the constituent members located on the front side and the back side, and is a solid, bead, curtain, summit or spiral application such as a hot melt adhesive
- the fixed portion of the elastic stretchable member is formed by coating the outer peripheral surface of the elastic stretchable member, such as a comb gun or a shroud coating, instead of or together with this.
- joining means for joining the constituent members fixing means by material welding such as heat sealing or ultrasonic sealing can be used.
- the underpants type disposable diaper of this form is the exterior body 12F, 12B which comprises the front body F and the back body B, and the inner side of the exterior body 12F, 12B so that it may extend from the front body F to the back body B through the crotch part.
- the side body 12A is formed by joining the both sides of the exterior body 12F of the front body F and the both sides of the exterior body 12B of the back body B to each other. .
- Symbol Y indicates the total length of the diaper in the unfolded state (vertical length from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the back body B), and symbol X indicates the total width of the diaper in the unfolded state. Is shown.
- the interior body 200 is a part that absorbs and holds excrement such as urine
- the exterior body 12 is a part that supports the interior body 200 with respect to the wearer's body.
- the upper openings of the exterior bodies 12F and 12B become waist openings WO through which the wearer's torso passes, and the lower edges of the exterior bodies 12F and 12B and the side edges of the interior body 200 on both sides in the width direction of the interior body 200, respectively.
- the enclosed part is a leg opening LO through which the leg passes.
- the pants-type disposable diaper of this embodiment forms a waist region T defined as a longitudinal range (a longitudinal range extending from the waist opening WO to the upper end of the leg opening LO) having the side seal portion 12A, and a leg opening LO. It has an intermediate region L that is defined as a front-rear direction range (between the longitudinal region having the side seal portion 12A of the front body F and the longitudinal region having the side seal portion 12A of the rear body B).
- the waistline region T can be divided into a “waist portion” W that conceptually forms the edge of the waist opening and a “waist lower portion” U that is a lower portion than this.
- the waist opening WO side is closer to the waist opening than the boundary on the waist opening WO side.
- the waist opening WO side becomes the waist portion W with respect to the absorbent body 56 or the interior body 200.
- the length in the vertical direction varies depending on the size of the product and can be determined as appropriate.
- the waist portion W can be 15 to 40 mm, and the waist lower portion U can be 65 to 120 mm.
- both side edges of the intermediate region L are wrapped in a U-shape or a curved shape along the circumference of the leg of the wearer, and this is a portion into which the wearer's leg is put.
- the unfolded pants-type disposable diaper from which the side seal portion 12A has been peeled has a substantially hourglass shape as a whole.
- the exterior bodies 12F and 12B include a front exterior body 12F that is a part constituting the front body F and a rear exterior body 12B that is a part constituting the rear body B.
- the front exterior body 12F and the rear exterior body 12B Are not continuous on the leg side and are spaced apart. This separation distance 12d can be about 150 to 250 mm.
- the exterior body 12 can also be made into the integral thing which continues between crotches from the front body F to the back body B. That is, the exterior bodies 12F and 12B that individually configure the front body F and the back body B correspond to the former form, and the exterior body 12 that integrally configures the front body F and the back body B corresponds to the latter form. .
- the exterior bodies 12F and 12B have a waistline portion that is a longitudinal range corresponding to the waistline region T.
- the front exterior body 12F does not have a portion corresponding to the intermediate region L, but the rear exterior body 12B has a collar cover portion 14 that extends from the waist region T to the intermediate region L side. is doing.
- the front exterior body 12F is also provided with a collar cover portion that extends from the waistline region T toward the intermediate region L, a configuration that does not provide a collar cover portion while providing a groin cover portion, and the front exterior body 12F and It is not necessary to provide a portion corresponding to the intermediate region L in both of the rear exterior bodies 12B.
- the lower edge of the buttock cover portion 14 is formed in a straight line shape along the width direction, similarly to the lower edge of the front exterior body 12F, but is positioned on the waist opening side toward the outer side in the width direction. It can also be a curve that becomes
- the exterior bodies 12F and 12B are formed by joining the outer sheet layer 12S and the inner sheet layer 12H by a joining means such as hot melt adhesive or welding, as shown in FIGS.
- the front and back are formed by.
- the outer sheet layer 12 ⁇ / b> S and the inner sheet layer 12 ⁇ / b> H are formed by folding one sheet material so that the crease is positioned on the waist opening side, as shown in FIG. 10. These sheet materials can also be bonded together.
- at least one of the outer sheet layer 12S and the inner sheet layer 12H may be formed of a sheet material that is partly different from other parts.
- the sheet material used for the outer sheet layer 12S and the inner sheet layer 12H can be used without particular limitation as long as it is a sheet, but is preferably a non-woven fabric.
- the nonwoven fabric is not particularly limited as to what the raw fiber is.
- synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated.
- the nonwoven fabric may be manufactured by any processing.
- Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method.
- a nonwoven fabric such as an SMS nonwoven fabric or an SMMS nonwoven fabric, in which a melt-blown nonwoven fabric layer of one or more layers of polypyrrolopylene fibers is sandwiched between spunbond nonwoven fabric layers of polypropylene fibers, outer sheet layer 12S and Suitable for the inner sheet layer 12H.
- the fineness is preferably about 0.5 to 2.5 dtex, and the basis weight is preferably about 10 to 30 g / m 2 . Therefore, the total basis weight of the nonwoven fabric used for the exterior bodies 12F and 12B is preferably about 20 to 60 g / m 2 .
- an elongated elastic elastic member 19 such as rubber thread is formed in a predetermined area in the trunk periphery direction. It is provided with an elongation rate.
- synthetic rubber or natural rubber may be used.
- hot melt adhesives and heat seals using various coating methods At least one of fixing means by material welding such as a sonic seal can be used.
- the outer sheet layers 12F and 12B are intermittently bonded to at least one of the front-rear direction and the width direction (for example, the passing position of the elongated elastic elastic member 19). Is preferably not joined, or conversely, only the passing position is joined). Both ends of the elongated elastic elastic member 19 in the width direction are fixed to the outer sheet layer 12S and the inner sheet layer 12H (fixed end portions).
- the elongated elastic elastic member 19 is preferably not fixed to the outer sheet layer 12S and the inner sheet layer 12H in terms of flexibility between the fixed ends, but may be fixed.
- the illustrated form is the latter, and the entire longitudinal direction of the elongated elastic elastic member 19 is fixed to the outer sheet layer 12S and the inner sheet layer 12H.
- a hot melt adhesive hot melt adhesion is performed only on the outer peripheral surface of the elongate elastic expansion / contraction member 19 by a coating means such as a comb gun or a shure wrap nozzle.
- a plurality of elastic elastic members of the waist portion are formed between the outer sheet layer 12S and the inner sheet layer 12H in the waist portion W of the exterior bodies 12F and 12B so as to be continuous over the entire width direction. 17 is attached in a state of being extended along the width direction at a predetermined extension rate with an interval in the vertical direction.
- the waist elastic elastic members 17 one or more disposed in the region adjacent to the waist lower part U may overlap with the interior body 200, or may be overlapped with the interior body 200. May be provided on both sides in the width direction except for.
- the waist elastic elastic member 17 has a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber.
- the cross-sectional area is 0.05 to 1.5 mm 2 , particularly 0.1 to 1.
- the rubber thread 0mm about 2), 4 3 to 22 present approximately at intervals of ⁇ 12 mm, respectively elongation 150-400%, especially preferably mounted at approximately 220 to 320%.
- the waist elastic elastic member 17 does not need to have the same thickness and elongation rate.
- the thickness and elongation rate of the elastic elastic member may be different between the upper portion and the lower portion of the waist portion W.
- a plurality of waist lower elastic elastic members 15 and 18 made of an elongated elastic elastic member are extended along the width direction at a predetermined extension rate with a space in the vertical direction so as to be continuous over the entire width direction. It is attached in the state.
- the waist lower elastic members 15 and 18 have a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber.
- the cross-sectional area is 0.05 to 1.5 mm 2 , particularly 0.1.
- (About 1.0 mm 2 ) is preferably attached at an interval of 1 to 15 mm, especially 3 to 8 mm, and about 5 to 30 pieces, with an elongation of 200 to 350%, particularly 240 to 300%.
- the width direction is provided in each part on both sides in the width direction.
- a plurality of cover elastic elastic members 16 made of an elongated elastic elastic member are attached in a state where they are extended in the width direction at a predetermined extension rate at intervals in the vertical direction so as to be continuous throughout. ing.
- the cover elastic member 16 has a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber.
- the cross-sectional area is 0.05 to 1.5 mm 2 , particularly 0.1 to 1. It is preferable to attach thread rubber of about 0 mm 2 ) at an interval of 5 to 40 mm, particularly 5 to 20 mm, and about 2 to 10 at an elongation of 150 to 300%, particularly 180 to 260%.
- a cover elastic member When providing an inguinal cover portion on the front exterior body 12F, a cover elastic member can be provided in the same manner.
- the elastic elastic members 19 (the waist lower elastic elastic members 15 and 18 and the cover elastic elastic member 16 in the illustration) provided in the exterior bodies 12F and 12B overlap the interior body 200. If it is provided on both sides in the width direction except for some or all, the interior body 200 will not shrink more than necessary in the width direction, and the appearance may be poor and absorbability may be reduced. Absent.
- the elastic elastic members 19 in addition to the form in which the elastic elastic members 19 exist only on both sides in the width direction, the elastic elastic members 19 exist from the one side in the width direction to the other side across the interior body 200.
- the elastic elastic member 19 is finely cut as shown by reference numeral 12X in FIG. 2 and FIG.
- the contraction force does not act (substantially no elastic elastic member is provided).
- a configuration in which only both sides in the width direction are configured as contraction force acting portions is also included.
- the arrangement form of the elastic stretch members 19 provided in the exterior bodies 12F and 12B is not limited to the above example, and the elastic stretch and contraction is performed so that the stretch force acts on the entire width direction including the portion overlapping the interior body 200. A part or all of the member 19 can be provided across the interior body 200 from one side in the width direction to the other side.
- the shape and structure of the interior body 200 are not particularly limited, and for example, the shape and structure described below can be adopted.
- the interior body 200 can take any shape, but is rectangular in the illustrated form.
- the interior body 200 includes a liquid-permeable top sheet 30 on the skin side of the wearer, a liquid-impermeable sheet 11, and an absorbent element 50 interposed therebetween. It is a main-body part which bears an absorption function.
- Reference numeral 40 indicates an intermediate sheet (also referred to as a second sheet) provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent element 50.
- Reference numeral 60 denotes a portion that extends along both widthwise sides of the absorption surface of the interior body and rises around the legs of the wearer in order to prevent excrement from leaking to both sides of the interior body 200. A certain leg gather 60 is shown.
- the top sheet 30 can be used without particular limitation as long as it is a liquid-permeable material such as a perforated or non-porous nonwoven fabric or a porous plastic sheet.
- a non-woven fabric is used when serving also as a covering material for the liquid-impermeable sheet 64 of the surrounding gathers 60.
- the nonwoven fabric is not particularly limited as to what the raw fiber is.
- synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated.
- the nonwoven fabric may be manufactured by any processing.
- processing method examples include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method.
- spunlace method a spunlace method
- thermal bond method a melt blown method
- melt blown method a melt blown method
- needle punch method an air through method
- point bond method a point bond method.
- the spunbond method and spunlace method are preferable.
- the air-through method, point bond method, and thermal bond method are preferable processing methods. .
- the top sheet 30 may be composed of one sheet or may be composed of a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.
- both sides in the width direction of the top sheet 30 do not serve as the covering material for the liquid-impermeable sheet 64 of the leg gathers 60, for example, as shown in FIGS.
- the liquid-impermeable sheet 64 of the leg gathers 60 In order to prevent the liquid from penetrating through the gap to the back side of the absorbent element 50, it can be adhered to the liquid-impermeable sheet 11 and the leg-around gather 60 with a hot melt adhesive or the like.
- an intermediate sheet (also called “second sheet”) 40 that is more hydrophilic than the top sheet can be provided on the back side of the top sheet 30.
- the intermediate sheet 40 is for preventing a reverse return phenomenon of the absorbed liquid from the absorber and ensuring a smooth touch on the top sheet 30.
- the intermediate sheet 40 can be omitted.
- the intermediate sheet 40 examples include the same materials as the top sheet 30, spunlace, spunbond, SMS, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond, or crepe paper.
- an air-through nonwoven fabric is preferable because it is bulky.
- the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable.
- Basis weight is preferably 20 ⁇ 80g / m 2, more preferably 25 ⁇ 60g / m 2.
- the thickness of the raw fiber of the nonwoven fabric is preferably 2.2 to 10 dtex.
- the intermediate sheet 40 in the illustrated form is arranged in the center shorter than the width of the absorbent body 56, but may be provided over the entire width.
- the length of the intermediate sheet 40 in the longitudinal direction may be the same as the length of the absorbent body 56 or may be within a short length range centered on the region that receives the liquid.
- the raw material of the liquid-impermeable sheet 11 provided in the back side of the absorber 56 is not specifically limited,
- the plastic film which consists of olefin resin, such as polyethylene and a polypropylene, can be illustrated.
- the liquid-impermeable sheet 11 it is preferable to use a liquid-impervious and moisture-permeable material that has been preferred in recent years from the viewpoint of preventing stuffiness.
- a plastic film having moisture permeability a microporous plastic film obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching in a uniaxial or biaxial direction. Is widely used.
- the liquid-impermeable sheet 11 extends to the side of the absorbent body 56 and also serves as the liquid-permeable film 64 in the leg circumference gather 60.
- the width fits on the back side of the absorbent element 50, or extends around both sides of the absorbent element 50 in the width direction and extends to both sides of the side of the top sheet 30 of the absorbent element 50. You can make it.
- an excretion indicator whose color is changed by absorption of the liquid component can be provided on the inner side of the liquid-impermeable sheet 11, particularly on the side of the absorber 56.
- the absorbent element 50 includes an absorbent body 56 and a packaging sheet 58 that wraps the entire absorbent body 56.
- the absorber 56 is obtained by mixing and collecting pulp fibers, synthetic fibers, and the like, and superabsorbent polymer particles.
- the fiber basis weight of the absorbent body 56 can be set to, for example, about 100 to 300 g / m 2 when cotton-like pulp or short fibers are stacked.
- the fineness thereof can be, for example, 1 to 16 dtex, preferably 1 to 10 dtex, more preferably 1 to 5 dtex.
- the absorber 56 may have a rectangular shape. However, as shown in FIG. 6, if the hourglass shape having a narrow portion 53 narrower than the front and rear sides is provided in the middle in the front-rear direction, the absorber 56 and the gathers around the legs are gathered. This is preferable because the fit around 60 legs is improved. Further, in order to improve the liquid diffusibility in the front-rear direction, the absorber 56 can be extended with a slit 54 penetrating in the thickness direction in the front-rear direction. As long as the slit 54 is provided in the crotch portion, the length in the front-rear direction is not particularly limited.
- the slit 54 may be provided over the entire front-rear direction of the absorber 56, but as shown in the figure, the front side to the rear side of the crotch portion. It is desirable to extend to the side.
- the slit 54 is preferably provided with one or two linear ones, but may be three or more, or may be curved.
- the dimension of the absorber 56 can be determined as appropriate, it preferably extends to the peripheral edge of the interior body 200 or the vicinity thereof in the front-rear direction and the width direction.
- Reference numeral 56 x indicates the width of the absorber 56.
- the absorbent body 56 contains a mixture of superabsorbent polymer particles in part or in whole.
- 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, for example, by sieving (shaking for 5 minutes) using a 500 ⁇ m standard sieve (JIS Z8801-1: 2006).
- the ratio of the particles remaining on the top is preferably 30% by weight or less, and the ratio of the particles remaining on the sieve by sieving (shaking for 5 minutes) using a 180 ⁇ m standard sieve (JIS Z8801-1: 2006) 60% by weight or more is desirable.
- the material for the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption (JIS K7223-1996 “Test method for water absorption of superabsorbent resin”) of 40 g / g or more are suitable.
- Superabsorbent polymer particles include starch, cellulose and synthetic polymers, such as starch-acrylic acid (salt) graft copolymer, saponified starch-acrylonitrile copolymer, and sodium carboxymethylcellulose cross-link. Or an acrylic acid (salt) polymer can be used.
- As the shape of the superabsorbent polymer particles a commonly used granular material is suitable, 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 preferably used. If the water absorption speed is too slow, the liquid supplied into the absorbent body 56 tends to cause a so-called reversal that returns to the outside of the absorbent body 56.
- the basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be generally stated, it can be 50 to 350 g / m 2 . If the amount of polymer is less than 50 g / m 2, it is difficult to secure the absorption amount. When it exceeds 350 g / m 2 , the effect is saturated.
- the absorbent body 56 is such that the total weight of the superabsorbent polymer particles is larger than the total weight of the fibers.
- the ratio of the fibers and the superabsorbent polymer particles in the absorbent body 56 is preferably 50:50 to 20:80, particularly 40:60 to 20:80, by weight of the fiber: superabsorbent polymer particles. Thereby, it can be set as the thinner absorber 56 compared with the same area and the same amount of absorption.
- the thickness 56t of the absorber 56 is not particularly limited, but can be 3 to 15 mm.
- the content (weight percentage) of the superabsorbent polymer particles in the absorber 56 is increased stepwise or continuously from the back side to the front side. Thereby, it becomes excellent in the reversal prevention property known as the phenomenon in which the liquid of the excretion which entered the absorber 56 side returns to the skin side.
- the content rate of the superabsorbent polymer particles changes stepwise is that a plurality of layers 51 and 52 having different content rates are laminated as in the absorber 56 shown in FIG. It means that the content rate is almost constant, and continuously changing means that there is no layer structure in which the content rate changes stepwise like the absorber 56 shown in FIG. (Inside, it is expressed by gradation).
- the content of the superabsorbent polymer particles in the absorber 56 is “in a stepwise or continuously high” means that the absorber includes the superabsorbent polymer particles in the entire thickness direction of the absorber. It includes a form having a layer (a layer having a content rate of 0) that does not contain the superabsorbent polymer particles on either one of the front and back sides, and the content rate increasing from there.
- the number of layers having a substantially constant content is not particularly limited, and the thickness of each layer is not particularly limited.
- the high content layer 51 and the low content layer 51 and the low content absorber may be used while the total weight of the superabsorbent polymer particles is larger than the total weight of the fibers.
- the content of the superabsorbent polymer particles in the high content layer 51 is 50 to 90% by weight, and the content of the superabsorbent polymer particles in the low content layer 52 is 15. It is preferable that the content be ⁇ 60% by weight.
- the thickness of the high content layer 51 is preferably 20 to 60% of the thickness 56t of the absorber 56
- the thickness of the low content layer 52 is preferably 40 to 80% of the thickness 56t of the absorber 56.
- the content of the superabsorbent polymer particles can be changed in the plane direction of the absorber 56.
- the amount of the liquid excretion site can be made larger than that of other sites.
- males can increase the front content, and females can increase the central content.
- a portion where no polymer exists locally (for example, in a spot shape) in the planar direction of the absorber 56 can also be provided.
- a liquid permeable material such as tissue paper, particularly a crepe paper, a non-woven fabric, a polylaminated non-woven fabric, or a sheet having small holes can be used.
- tissue paper particularly a crepe paper
- non-woven fabric a non-woven fabric
- polylaminated non-woven fabric a sheet having small holes
- the superabsorbent polymer particles be a sheet that does not escape.
- a nonwoven fabric is used in place of the crepe paper
- a hydrophilic SMS nonwoven fabric SMS, SSMMS, etc.
- the basis weight is preferably 5 to 40 g / m 2 , particularly 10 to 30 g / m 2 .
- the packaging form of the packaging sheet 58 includes front and back surfaces of the absorbent body 56, and the like, from the viewpoint of ease of manufacture and prevention of leakage of the superabsorbent polymer particles from the front and rear edges. It is set as the winding form wound around a cylinder so that both side surfaces may be surrounded. More specifically, the packaging sheet 58 includes an intermediate portion 58m located on the front side of the absorbent body 56, and both side portions 58s folded back from the intermediate portion 58m to the back side of the absorbent body 56. The front ends of both side portions 58s are overlapped on the back side of the absorber 56 to form a connecting portion 58c. The front and rear end portions of the packaging sheet 58 protrude from the front and rear of the absorbent body 56, and are joined directly without the absorbent body 56 at the protruding portion.
- the connecting portion 58c of the packaging sheet 58 is located on the back side of the absorbent body 56, that is, on the side opposite to the portion having a high content of the superabsorbent polymer particles, the bonding portion 58c of the packaging sheet 58 is bonded. Even if it becomes insufficient, the superabsorbent polymer particles are difficult to leak out, and even if the superabsorbent polymer particles detached from the absorber 56 leak out from the connecting portion 58c of the packaging sheet 58, the absorbent element 50 Since it is on the back side, there is little risk of leaking to the skin side of the wearer.
- the overlapping part of the wrapping sheet 58 has higher liquid retention than other parts, there is a risk of promoting reversal if it is located on the front side of the absorbent body 56, but if this is located on the back side of the absorbent body 56, Such a problem does not occur.
- Adhesive structure of packaging sheet and absorber As for the inner surface of the packaging sheet 58, the whole part which opposes the absorber 56 is adhere
- attach the packaging sheet 58 and the absorber 56 is not specifically limited, Area
- the amount of the hot melt adhesives H1 and H2 used to bond the packaging sheet 58 and the absorbent body 56 can be determined as appropriate, but is 12 to 25 g / m 2 in the large area A1 and 9 to 15 g / m in the small area (other than A1). A range of m 2 is preferable.
- the usage amount of the large area A1 is preferably about 1.1 to 1.4 times the usage amount of the small area.
- the amount of hot melt adhesive used to bond the packaging sheet 58 and the absorbent body 56 may be equal on both the front and back sides of the absorbent body 56 (the large area A1 is not formed).
- the amount of hot melt adhesives H1 and H2 used to bond the packaging sheet 58 and the absorbent body 56 is not particularly limited, but is preferably in the range of 2 to 10 g / m 2 .
- the absorber 56 when the total weight of the superabsorbent polymer particles in the absorber 56 is larger than the total weight of the fibers (that is, the absorber 56 having a high content of the superabsorbent polymer particles), the absorber 56. Therefore, it is preferable to reinforce the hot melt adhesives H1 and H2 with the large amount region A1 as described above.
- the constricted portion 53 for improving the fit around the leg is formed in the absorbent body 56, the shape of the constricted portion 53 is likely to be collapsed, so the hot melt adhesives H1, H2 It is a preferable mode that the large amount region A1 is a region including the entire width direction of the constricted portion 53 and the collapse of the shape of the absorber 56 in the constricted portion 53 is suppressed.
- the amount of hot melt adhesives H1 and H2 used may be created by changing the application amount in one application for each part, but is often difficult. 3, 7, and 12 (a) and 12 (b), it is preferable that the hot melt adhesives H 1 and H 2 are produced by changing the number of layers (that is, the number of coatings) for each part. .
- the usage-amount of hot-melt-adhesive H1 and H2 when changing the usage-amount of hot-melt-adhesive H1 and H2 by these according to the number of lamination
- the absorber 56 has an impregnated layer in which a hot melt adhesive H2 having a melt viscosity of 1000 to 6000 mPa ⁇ s (preferably 2000 to 5500 mPa ⁇ s) is impregnated on the side having the connecting portion 58c. And the portion facing the impregnation layer 562 on the inner surface of the packaging sheet 58 is provided with an adhesive layer 561 made of a hot melt adhesive H1 having a melt viscosity of 4000 to 9000 mPa ⁇ s (preferably 6000 to 8000 mPa ⁇ s).
- the hot melt adhesive H2 impregnated in the impregnation layer 562 is preferably lower in viscosity than the hot melt adhesive H1 that is adhered to the outer surface of the impregnation layer 562 and forms the adhesive layer 561. .
- the portion of the absorbent body 56 that does not have the impregnated layer 562 can be bonded to the inner surface of the packaging sheet 58 only through the adhesive layer 561.
- the structure using the hot melt adhesives H1 and H2 having different melt viscosities at appropriate positions makes it possible to form the impregnated layer 562 because the melt viscosity of the hot melt adhesive H2 is sufficiently low.
- the absorbent body 56 can be sufficiently impregnated to effectively stabilize the shape of the absorbent body 56, and when the adhesive layer 561 is formed, the melt viscosity of the hot melt adhesive H1 is high, so that the absorbent body 56 and the packaging sheet 58 are formed.
- the absorbent body 56 and the packaging sheet 58 have good adhesion, so that the shape of the absorbent body 56 can be prevented from collapsing.
- the impregnated layer 562 is formed in a range from the impregnated surface to a certain depth by impregnating the absorbent body 56 with the hot melt adhesive H2.
- the thickness of the impregnated layer 562 is not particularly limited, but is preferably about 10 to 50% of the thickness 56t of the absorber 56.
- the hot melt adhesive H2 of the impregnated layer 562 may penetrate the absorbent body 56 as a whole in the thickness direction as shown in FIG. 13 (a), or in the thickness direction as shown in FIG. 13 (b). The part may remain on the absorber 56.
- the adhesive layer 561 is a layer of hot melt adhesive H1 mainly located between the packaging sheet 58 and the impregnation layer 562 of the absorbent body 56, and also impregnates the packaging sheet 58 to some extent. It is.
- the absorber 56 is hardly impregnated in the portion having the impregnated layer 562, and the portion having no impregnated layer 562 is impregnated in the absorber 56 rather than the portion having the impregnated layer 562.
- the composition of the hot melt adhesive H2 of the impregnated layer 562 and the hot melt adhesive H1 of the adhesive layer 561 is not particularly limited as long as the melt viscosity is within the above range, but from the viewpoint of softness and odor, a rubber-based hot It is preferable to use a melt adhesive. Moreover, it is preferable that the hot melt adhesive is provided with a functional group that increases polarity. By increasing the polarity of the hot melt adhesive, adhesion between the pulp fiber, the superabsorbent polymer, and the packaging sheet 58 when wet can be strengthened by intermolecular force. Furthermore, it is preferable to use a delayed crystal type as the hot melt adhesive H2 of the impregnation layer 562.
- the delayed crystal type is a hot melt adhesive that does not crystallize immediately after coating but has a property of setting after permeating between fibers.
- Adhesive strength can be increased.
- FIG. 13 to FIG. 15 show an example of equipment / process for manufacturing the above-described absorbent element 50.
- the sections (a) to (d) shown in FIGS. 13 and 14 correspond to the cross-sectional states of (a) to (d) shown in FIG.
- this manufacturing equipment 100 first, pulp fibers and superabsorbent polymer particles 56P obtained by defibrating the pulp sheet 56F with the defibrator 101 are supplied from above the stacking drum 102 that is disposed sideways and rotationally driven. .
- an absorbent body mold 102m having a rotation direction in the front-rear direction is formed in a concave shape, and a number of suction holes (not shown) are formed on the bottom surface of the absorbent body mold 102m.
- the mixture of pulp fibers and superabsorbent polymer particles is accumulated in the absorber mold 102m by suction from the suction hole in the absorber mold 102m at the supply position of the absorbent polymer particles, and the absorber 56 is formed.
- the fiber supply path 102i for the stacking drum 102 is divided into a plurality of drum rotation directions, the amount of superabsorbent polymer supplied to each supply path is different, and the separation distance between the outlet of each supply path and the drum outer peripheral surface is changed. By making it, the content rate of the superabsorbent polymer particle of the accumulation
- the fiber supply path 102i for the stacking drum 102 is divided into two in the drum rotation direction, and the superabsorbent polymer 56P is supplied only to the supply path on the rotation direction side, whereby the bottom side in the absorber mold 102m (suction) A layer containing substantially no superabsorbent polymer particles 56P is formed on the hole side), and a layer containing superabsorbent polymer particles 56P is formed on the inlet side of the absorber mold 102m.
- the superabsorbent polymer particles 56P are not easily clogged.
- the absorbent body 56 formed in the absorbent body mold 102m is positioned so as to face the continuous belt-shaped packaging sheet 58 supplied along the outer peripheral surface of the fiber stacking drum 102 by the rotation of the fiber stacking drum 102. Sometimes, it is removed from the mold and transferred onto the packaging sheet 58.
- a first adhesive layer G1 is formed in advance on the transfer surface of the absorbent body 56 in the packaging sheet 58 by application of a hot melt adhesive M1, and the absorbent body 56 is formed on the packaging sheet 58 by the first adhesive layer G1. Glued.
- the absorbent body 56 is intermittently supplied onto the packaging sheet 58 that is continuously transferred, and the bonding is sequentially performed.
- the wrapping sheet 58 has a width in the CD direction perpendicular to the MD direction (sheet transfer direction) that is wider than the absorber 56, and after the absorber 56 is transferred onto the CD direction intermediate portion 58m,
- the second adhesive layer G2 is formed by applying the hot melt adhesive M2 over the entire width of the upper surface of the absorber 56.
- the second adhesive layer G2 is an adhesive layer whose main purpose is to impregnate the absorbent body 56 to improve the shape maintenance of the absorbent body 56, but also serves as an adhesive to the packaging sheet 58.
- coating of the hot melt adhesive M3 is formed in the one end part of CD direction of a packaging sheet as needed.
- the stacking drum 102 Prior to the application of the hot melt adhesive M2 for forming the second adhesive layer G2, the stacking drum 102 is accumulated so as to contain a large amount of the superabsorbent polymer particles 56P on the bottom side of the absorber mold 102m. When it is performed and transferred onto the packaging sheet 58 (in this case, the upper and lower sides of the absorbent body 56 are switched), the absorbent body 56 contains a large amount of superabsorbent polymer particles 56P. There is a problem that when the hot melt adhesive M2 is applied to the upper surface of 56, the superabsorbent polymer particles 56P are likely to be scattered by the application force.
- the absorber 56 when accumulation is performed such that the content of the superabsorbent polymer particles increases stepwise or continuously from the bottom side to the inlet side of the absorber mold 102m in the stacking drum 102, the absorber 56 When the hot melt adhesive M2 is applied to the upper surface of the film, the content of the superabsorbent polymer particles 56P decreases toward the upper surface side of the absorber 56, and the superabsorbent polymer particles are less likely to be scattered.
- both side portions 58s protruding from the CD side of the absorbent body 56 in the packaging sheet 58 are folded back at positions along both side edges of the absorbent body 56 by a sailor (not shown). (Second bonding step) and both ends in the CD direction are overlapped, and the overlapping portion is bonded by a third adhesive layer G3 formed by applying a hot melt adhesive M3 in advance. 58c is formed.
- the packaging sheet 58 can be folded and then passed between the pair of crimping rolls 104 to be crimped. In this way, a continuous body of absorbent elements 50 in which the absorbent body 56 is intermittently fixed in the MD direction is formed in the cylindrical continuous body of the packaging sheet 58 continuous in the MD direction.
- the continuous body of the absorption element 50 manufactured through these 1st adhesion processes and 2nd adhesion processes is continuous with the continuous belt-like top sheet 30.
- the continuous body of leg circumference gathers 60 After being sandwiched between the belt-shaped liquid-impermeable sheet 11 and, if necessary, a continuous body of leg circumference gathers 60 is attached, it is intermittently cut in the MD direction to form individual interior bodies 200.
- the side seal part 12A is formed and cut
- the continuous body of absorbent elements is sandwiched between a continuous belt-like top sheet and a continuous belt-like liquid-impermeable sheet, and if necessary, legs.
- a continuous body of surrounding gathers is attached (in the case of a tape-type disposable diaper, a fastening tape is also attached), and then intermittently cut in the MD direction to form individual diapers.
- the connecting portion 58c of the packaging sheet 58 is positioned on the back side of the absorbent body 56, after the absorbent element 50 is manufactured in the direction immediately after the fiber stacking drum 102 as shown in the figure, By reversing the direction of the absorbent element 50, the member mounted on the front side of the absorbent body 56 in the absorbent article is attached to the upper side, and the back side of the absorbent body 56 in the absorbent article is attached to the lower side. What is necessary is just to attach the member equipped with.
- a member mounted on the back side of the absorbent body 56 in the absorbent article is attached to the upper side, and the absorbent article 50 is placed on the front side of the absorbent body 56 in the lower absorbent article.
- a member to be equipped can also be attached.
- the first adhesive layer G1 is formed on the packaging sheet 58 wider than the sum of the width 56x of the absorbent body 56 and the thickness of the absorbent body 56t.
- the first adhesive layer G1 applied to the folded portion and the second surface applied to the upper surface of the absorber 56 at least at both ends in the width direction of the absorber 56. It is a preferable mode to adhere the folded portion and the upper surface of the absorbent body 56 through the adhesive layer G2.
- the inner surface of the packaging sheet 58 and the absorber 56 will be adhere
- the upper surface side of the absorbent body 56 the side having the connecting portion 58c of the packaging sheet 58
- the two layers of the first adhesive layer G1 and the second adhesive layer G2 are used. The inner surface of the packaging sheet 58 and the absorbent body 56 are bonded.
- H2 can be used more than the opposite side of the absorber 56.
- the side surface of the absorber 56 can also be adhered without a gap. Therefore, it becomes possible to effectively suppress the collapse of the shape of the absorbent body 56 while suppressing the total amount of the hot melt adhesives H1 and H2 for bonding the absorbent body 56 and the packaging sheet 58.
- the first bonding steps (a) to (b) are performed as shown in FIG. )
- the first adhesive layer G1 that protrudes on both sides in the width direction of the absorbent body 56 adheres to the press device 103 when the press process is performed over the entire width of the absorbent body 56.
- the pressing step for pressing the absorbent body 56 over its entire width is not performed, or the pressing step is not performed.
- a pressing step can be performed as in the conventional example.
- the absorbent body 56 is constricted along the periphery of the leg as illustrated.
- the width W2 of the constricted portion 53 is further wider than the width obtained by adding the concavity portion 53 to both sides in the CD direction.
- the application width W1 of the first adhesive layer G1 is equal to the width of the absorber 56 and the absorber.
- the total thickness of 56 is preferably wider than the width obtained by adding a width W3 from the side edge of the absorber 56 to the side edge of the slit 54 on both sides in the CD direction.
- the application width W1 of the first adhesive layer G1 is expanded to the overlapping portion of the packaging sheet 58, and the first adhesive layer G1 is bonded to the overlapping portion.
- the application pattern of the hot melt adhesives M1 and M2 for forming the first adhesive layer G1 and the second adhesive layer G2 is not particularly limited, but the first adhesive layer G1 is applied to a wide range of the packaging sheet 58.
- the permeability into the packaging sheet 58 and the absorbent body 56 is not necessarily high. do not have to.
- the main purpose of the second adhesive layer G2 is to impregnate the absorbent body 56 to improve the shape maintenance of the absorbent body 56 (to form the above-described impregnated layer 562). It is preferable that the permeability is high.
- the hot melt adhesive M1 constituting the first adhesive layer G1 is applied in a spiral shape or a mesh shape, and the hot melt adhesive M2 constituting the second adhesive layer G2 is It is preferably applied in a continuous surface.
- the hot melt adhesive M1 for forming the first adhesive layer G1 preferably has a melt viscosity of 4000 to 9000 mPa ⁇ s
- the hot melt adhesive M2 for forming the second adhesive layer G2. Preferably has a melt viscosity of 1000 to 6000 mPa ⁇ s.
- the viscosity of the hot melt adhesive M2 for forming the second adhesive layer G2 is lower than that of the hot melt adhesive M1 for forming the first adhesive layer G1.
- the leg gathers 60 are portions that extend along the widthwise sides of the absorption surface of the interior body 200 and rise toward the wearer's legs, and move in the lateral direction along the top sheet 30. It is provided to block soft stools and prevent side leakage.
- the leg-around gather 60 of this embodiment includes an inner nonwoven fabric layer 61 that constitutes an inner surface in the width direction, an outer nonwoven fabric layer 62 that constitutes an outer surface in the width direction, and an intermediate in the front-rear direction.
- the gather elastic elastic member 63 provided along the front-rear direction between the inner nonwoven fabric layer 61 and the outer nonwoven fabric layer 62 at least at the distal end portion, and the inner nonwoven fabric over a range from the proximal end to the distal end side position relative to the proximal end.
- the inner non-woven fabric layer 61 is present in the leg gathers 60 having the liquid-impermeable sheet 64 and the base end side of the leg gathers 60 over the entire front and rear direction of the leg gathers 60.
- the non-woven fabric nonexistent portion 65 from which the liquid impermeable sheet 64 is exposed is used.
- the amount of nonwoven fabric used can be reduced by providing the leg-gathered gather 60 with the non-woven fabric non-existing portion 65 without the inner nonwoven fabric layer 61.
- tip part of the leg circumference gathers 60 is a part which contacts skin, by providing the nonwoven fabric non-existing part 65 avoiding there, the liquid-impermeable sheet 64 becomes difficult to contact skin, and the touch deteriorates. Can be suppressed.
- the inner nonwoven fabric layer 61 is extended to the side of the top sheet 30, or the gathers 60 around the legs having the structure shown in FIGS. 7 and 8 are used.
- the entire sheet 64 may be hidden.
- the gather elastic elastic members 63 may be provided only at the distal end portion of the leg-around gather 60, but a plurality of gather elastic stretch members 63 are provided at intervals in the direction from the tip of the leg-around gather 60 to the base end as shown in the figure. Is preferred. Usually, the number of gather elastic elastic members 63 is preferably 2 to 6, and the mutual interval 60d is preferably 3 to 10 mm. As described above, when a plurality of gather elastic elastic members 63 are provided at intervals, a portion between them is recessed outward. Therefore, when the non-woven fabric non-existing portion 65 is provided only at this interval portion as shown in the drawing, the nonwoven fabric is provided.
- the liquid-impermeable sheet 64 exposed to the nonexisting portion 65 is preferable because it is recessed and hardly comes into contact with the skin.
- the gather elastic elastic members 63 are provided at least at the distal end and the proximal end of the leg gather 60 at intervals of one or more. It is particularly preferable that the non-woven fabric non-existing portion 65 is provided only in the space between the gather elastic elastic member 63 and the gather elastic elastic member 63 at the tip.
- the front-rear direction range in which the gather elastic elastic members 63 are provided in the leg gathers 60 can be the entire front-rear direction of the leg gathers 60, but is preferably less than or equal to the front-rear direction range of the rising portion.
- the gather elastic elastic member 63 is provided between the inner nonwoven fabric layer 61 and the outer nonwoven fabric layer 62 (for this reason, it is not provided in the non-woven fabric non-existing portion 65), the liquid impermeability incorporated in the leg circumference gather 60
- the sheet 64 can be provided on the inner side as shown in FIGS. 3 and 9, or can be provided on the outer side as shown in FIG.
- the range in which the liquid permeable film 64 is provided may be from the base end to the intermediate position between the base end and the distal end as long as it is a range from the base end of the leg-around gather 60 to a position closer to the distal end than the base end.
- the liquid-impermeable sheet 64 is exposed in the non-woven fabric non-existing portion 65
- the impermeable sheet 64 may be pressed against the skin.
- the portion 60W is fixed to the front exterior body 12F and the rear exterior body 12B, and the elastic elastic members 15 and 19 of the front exterior body 12F and the rear exterior body 12B.
- the region between the fixed portions 60W with respect to the front exterior body 12F and the rear exterior body 12B is located at the base edge of the absorbent body 56 as the gather elastic elastic member 63 contracts. As shown by a two-dot chain line in FIG.
- the member structure of the leg circumference gathers 60 is not particularly limited, and a known structure can be adopted.
- the top sheet 30 is made of a nonwoven fabric, and both sides in the width direction extend from the side edges of the absorbent body 56, and the back side of the absorbent body 56 has a nonwoven fabric.
- the gather sheet 66 is provided, and both sides in the width direction extend from the side edges of the absorber 56. Further, the side end portion of the gather sheet 66 is folded back, and the tip of the folded portion 66r is the top.
- the liquid impervious sheet 64 is provided between the top sheet 30 and the gather sheet 66 at least from the folded portion 66r of the gather sheet 66 while being separated from the front end of the sheet 30.
- the outer nonwoven fabric layer 62 is formed by a portion other than the folded portion 66r of the gather sheet 66, and the folded portion 66r of the gather sheet 66 and the portion extending to the side of the absorbent body 56 in the top sheet 30
- the nonwoven fabric non-existing portion 65 is formed by the portion where the nonwoven fabric layer 61 is formed and the folded portion 66r of the gather sheet 66 and the top sheet 30 are separated from each other. In this way, when the inner nonwoven fabric layer 61 on the proximal end side of the non-woven fabric non-existing portion 65 in the leg circumference gathers 60 is formed by the top sheet 30 and the others are formed by the gather sheet 66, the nonwoven fabric is not required to cut the material.
- the non-existing portion 65 can be provided, and the structure thereof is very simple and easy to manufacture.
- the liquid-impermeable sheet 64 of the leg gather 60 is passed from the leg gather 60 on one side to the back side of the absorber 56, and the leg gather 60 on the other side. It is preferable to extend to the leg gathers 60 as well as the water-proofing of the back side of the absorbent body 56, but it is preferable that the shape shown in FIGS.
- the liquid permeable film 64 to be incorporated in the leg gathers 60 and the liquid permeable film 11 covering the back side of the absorber 56 can be provided separately. In the latter case, the material of the liquid permeable film 64 incorporated in the leg-gathered gather 60 and the material 11 of the liquid permeable film covering the back side of the absorber 56 may be the same or different.
- the gather sheet 66 is also formed by an integral sheet from the one leg leg gather 60 to the other leg leg gather 60 through the back side of the absorbent body 56 as shown in FIGS. 3 and 4. It is preferable that an outer surface such as a cloth can be obtained without separately providing the above-described crotch cover sheet, but the gather sheet 66 and the crotch cover sheet as shown in FIGS. 12M may be provided individually.
- the free portion 69F rises around the leg as shown by a two-dot chain line in FIG. .
- the extending portion 69 of the leg-around gather 60 in the form shown in FIGS. 7 and 8 includes a root side portion toward the center in the width direction and a tip side portion folded back outward in the width direction from the tip of the root side portion.
- a form (not shown) consisting of only a portion toward the center in the width direction without being folded back in the width direction.
- various coating methods are used for bonding the inner nonwoven fabric layer 61 and the outer nonwoven fabric layer 62 and fixing the gather elastic elastic member 63 sandwiched therebetween. It is possible to use at least one of a hot melt adhesive and a fixing means by material welding such as heat sealing or ultrasonic sealing. When the entire surfaces of the inner nonwoven fabric layer 61 and the outer nonwoven fabric layer 62 are bonded together, flexibility is impaired. Therefore, it is preferable that portions other than the bonding portion of the gather elastic elastic member 63 are bonded or weakly bonded.
- a hot melt adhesive is applied only to the outer peripheral surface of the gather elastic elastic member 63 by an application means such as a comb gun or a sure wrap nozzle, and is sandwiched between the inner nonwoven fabric layer 61 and the outer nonwoven fabric layer 62, thereby collecting the gather elasticity.
- an application means such as a comb gun or a sure wrap nozzle
- the elongate elastic stretchable member is fixed to the inner nonwoven fabric layer 61 and the outer nonwoven fabric layer 62, and the inner nonwoven fabric layer 61 and the outer nonwoven fabric layer 62 are fixed. It has a structure to do.
- the inner nonwoven fabric layer 61 and the outer nonwoven fabric layer 62 are bonded together, or the front exterior body 12F of the leg circumference gathers 60 in the form shown in FIGS.
- a hot melt adhesive by an application method and fixing means 67 by material welding such as heat sealing or ultrasonic sealing can be used.
- the hot melt adhesive and the fixing means 67 by material welding are combined, but these can be fixed only by any one means.
- the size of the leg gathers 60 can be determined as appropriate, but in the case of an infant paper diaper, the standing height of the leg gathers 60 (the distance in the width direction between the distal end and the proximal end in the unfolded state) is 15 to 60 mm, particularly 20 It is preferably ⁇ 40 mm.
- the inner nonwoven fabric layer 61 and the outer nonwoven fabric layer 62 are flexible, uniform and concealing nonwoven fabrics such as spunbond nonwoven fabric (SS, SSS, etc.), SMS nonwoven fabric (SMS, SSMMS, etc.), melt blown nonwoven fabric, etc.
- SS spunbond nonwoven fabric
- SMS SMS nonwoven fabric
- SSMMS SSMMS
- melt blown nonwoven fabric etc.
- a material subjected to water repellency treatment with silicon or the like can be suitably used, and the fiber basis weight is preferably about 10 to 30 g / m 2 . In the form shown in FIGS.
- the inner nonwoven fabric layer 61 and the outer nonwoven fabric layer 62 of the outer nonwoven fabric layer 62 are formed as the inner nonwoven fabric layer 61 on the proximal end side from the nonwoven fabric absent portion 65 is formed by the top sheet 30. It is also possible to make the materials partially different, and it is also possible to make the materials of the inner nonwoven fabric layer 61 and the outer nonwoven fabric layer 62 different.
- the gather elastic elastic member 63 may be an elongated elastic elastic member such as a thread rubber or a belt rubber.
- the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex.
- the elongation at the time of fixation is preferably 150 to 350%, more preferably 200 to 300%.
- leg gathers 60 are provided in one row on each of the left and right sides, but a plurality of rows can be provided.
- test location is temperature 20 ⁇ 5 ° C., relative humidity 65% or less
- Pre-drying refers to making a sample or test piece constant in an environment where the relative humidity is 10 to 25% and the temperature does not exceed 50 ° C. In addition, it is not necessary to perform preliminary drying about the fiber whose official moisture content is 0.0%.
- a sample with a size of 200 mm ⁇ 250 mm ( ⁇ 2 mm) is cut out from the test piece in a constant weight using a rice-basis plate (200 mm ⁇ 250 mm, ⁇ 2 mm).
- “Bending softness” means “8.21.1 A method (45 ° cantilever method)” of JIS L 1096: 2010 “Fabric and knitted fabric testing method”. “Melt viscosity” is measured at a temperature of 140 ° C. using a Brookfield B-type viscometer (spindle No. 027) according to JIS Z 8803. ⁇ If there is no description about the environmental conditions in the test and measurement, the test and measurement shall be performed in a test room or equipment in the standard condition (test location is temperature 20 ⁇ 5 °C, relative humidity 65% or less). . -Unless otherwise specified, the dimensions of each part mean dimensions in a deployed state, not a natural length state.
- the present invention is suitable for a pants-type disposable diaper as in the above example, but can be applied not only to a tape-type or pad-type disposable diaper but also to absorbent articles such as sanitary napkins.
- SYMBOLS 11 Liquid impermeable sheet
- Non-woven fabric non-existing portion 66 Gather sheet 66r Folded portion 200 Inner body 12S Outer sheet layer 12H Inner sheet layer 19 Elastic elastic member 17 Waist elastic elastic member 15, 18 Elastic lower elastic member , 16 ... cover elastic member, 53 ... constricted part, 54 ... slit, 58c ... connecting part, H1, H2 ... hot melt adhesive, 101 ... defibrator, 102 ... stacking fiber Ram, 100 ... manufacturing facilities, 102m ... absorption type, G1 ... first adhesive layer, G2 ... second adhesive layer, G3 ... third adhesive layer, 56P ... superabsorbent polymer particles.
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- Heart & Thoracic Surgery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
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- Absorbent Articles And Supports Therefor (AREA)
Abstract
Description
<請求項1記載の発明>
吸収体が包装シートで包装されてなる吸収要素を備え、
前記吸収体は、繊維及び高吸収性ポリマー粒子が混合集積されたものであり、
前記包装シートは、前記吸収体の表側に位置する中間部分と、この中間部分から前記吸収体の裏側に折り返された両側部分とを有するとともに、この包装シートの両側部分の先端部が前記吸収体の裏側で重なり合わされて連結部が形成されており、
前記吸収体は、前記繊維の総重量よりも前記高吸収性ポリマー粒子の総重量が大きいものであるとともに、
前記吸収体の前記高吸収性ポリマー粒子の含有率が、裏側から表側に向かうにつれて段階的又は連続的に高くなっている、
ことを特徴とする吸収性物品。
本発明では、吸収体の高吸収性ポリマー粒子の含有率が高く、かつその含有率が裏側から表側に向かうにつれて段階的又は連続的に高くなっているため、逆戻り防止性に優れたものとなる。それでいて、包装シートの連結部は、吸収体の裏側(つまり吸収体の高吸収性ポリマー粒子含有率の高い部分と反対側)に位置することとなるため、包装シートの連結部の接着が不十分になることがあっても、高吸収性ポリマー粒子が漏れ出しにくく、また吸収体から離脱した高吸収性ポリマー粒子が包装シートの連結部から漏れ出たとしても、吸収要素の裏側であるため、装着者の肌側に漏れ出るおそれが少ないものとなる。さらに、包装シートの重なり合う部分は、それ以外の部分と比べて液保持性が高いため、吸収体の表側に位置すると、逆戻りを助長するおそれがあるが、本発明では吸収体の裏側に位置するため、このような問題は発生しない。
前記包装シートの内面は、前記吸収体と対向する部分の全体がホットメルト接着剤を介して前記吸収体の外面に接着されており、
前記包装シート及び前記吸収体を接着するホットメルト接着剤の使用量が、前記吸収体の表側よりも、前記吸収体の裏側における少なくとも幅方向両端部の領域の方が多い、
請求項1記載の吸収性物品。
本発明者は、製造設備の開発過程で、包装シート巻付けタイプの吸収要素の製造工程に、吸収体形状の崩れやすさを助長する原因が隠れているのを発見した。すなわち、包装シート巻付けタイプの吸収要素では、製造に際して、吸収体を転写する際に吸収体の下面と包装シートの中間部とを接着した後、包装シートの両側部分を折り返して吸収体の上面に接着することになるため、吸収体の表裏両側を同条件で接着することができない。ここで、包装シートの両側部分を折り返して吸収体の上面に接着するときには、吸収体の上面に予めホットメルト接着剤を塗布し、これに包装シートの両側部分を折り返して接着すると、吸収体の上面形状が安定するという利点があったため、このような手法が採用されてきた。しかし、吸収体の表面はプレス装置で押し固めたとしても低密度で、凹凸が大きい構造である。そのため、吸収体にホットメルト接着剤を塗布して包装シートに接着した場合は、同じホットメルト接着剤の使用量(単位面積当たりの重量を意味する。以下同じ。)で、包装シートにホットメルト接着剤を塗布して吸収体と接着した場合と比べると、接着が相対的に弱くなる。つまり、包装シートの折り返し時における吸収体の上面形状の安定性を確保するために採用してきた塗布方式が、製品における吸収体の形状の崩れを引き起こすおそれを生み出していたのである。
前記吸収体の前後方向中間部に幅方向中央側に括れた括れ部が形成されており、
前記包装シート及び前記吸収体を接着するホットメルト接着剤の使用量が、前記吸収体の表側よりも多い領域は、前記括れ部の幅方向全体を含む領域とされている、
請求項2記載の吸収性物品。
脚周りのフィット性を向上させるための括れ部を吸収体に形成する場合、本項記載のように、包装シート及び吸収体を接着するホットメルト接着剤の使用量の多い領域を、括れ部の幅方向全体を含む領域とすることにより、括れ部における吸収体形状の崩れを抑制することができる。使い捨ておむつにおいては、括れ部を吸収体に形成することは一般的であるが、その部分は両脚に挟まれて最もストレスのかかる部分であるため、本項記載のように構成することにより、特に効果的に吸収体の崩れを抑制することができる。また、吸収体から括れ部にこぼれ出した高吸収性ポリマー粒子をホットメルト接着剤が効果的に捕捉固定することも可能となる。
前記吸収体の幅方向中間部に、厚み方向に貫通するスリットが前後方向に延在しており、
前記包装シート及び前記吸収体を接着するホットメルト接着剤の使用量が、前記吸収体の表側よりも多い領域は、前記スリットの幅方向両端部を含む領域とされている、
請求項2又は3記載の吸収性物品。
前後方向の液拡散性を向上させるために、厚み方向に貫通するスリットを吸収体に形成する場合、本項記載のように、包装シート及び吸収体を接着するホットメルト接着剤の使用量の多い領域を、スリットの幅方向両端部を含む領域とすることにより、スリットにおける吸収体形状の崩れを抑制することができる。また、吸収体からスリット部にこぼれ出した高吸収性ポリマー粒子をホットメルト接着剤が効果的に捕捉固定することも可能となる。
前記包装シート及び前記吸収体を接着するホットメルト接着剤の使用量が、前記吸収体の表側よりも多い領域は、ホットメルト接着剤層の積層数が前記吸収体の一方側よりも多い領域である、請求項2~4のいずれか1項に記載の吸収性物品。
ホットメルト接着剤の使用量を局所的に増加する場合、単に一回の塗布における塗布量を局所的に増加することもできるが、困難な場合が多いため、本項記載のように積層数により増加させることが望ましい。
前記包装シート及び前記吸収体を接着するホットメルト接着剤の使用量が、前記吸収体の表側よりも多い領域では、前記ホットメルト接着剤の塗布パターン及び種類の少なくとも一方が異なる複数のホットメルト接着剤層が積層されており、
前記吸収体の表側では、前記包装シート及び前記吸収体を接着するホットメルト接着剤の層が、前記複数のホットメルト接着剤の層のうち最も包装シート側に位置する層と塗布パターン及び種類が同じである、
請求項2~5のいずれか1項に記載の吸収性物品。
回転方向を前後方向とする凹状の吸収体型が外周面に形成されるとともに、吸収体型の底面に多数の吸引孔が形成され、横向きに配置されて回転駆動される積繊ドラムを用い、
前記吸引孔から吸引を行いつつ前記吸収体型内に繊維及び高吸収性ポリマー粒子の混合物を集積して吸収体を形成し、
前記吸収体型内に形成した吸収体を、包装シートの上面における幅向中間部分に転写し、前記包装シートにおける前記吸収体の幅方向両側に位置する部分を、前記吸収体の上側にそれぞれ折り返し、これら折り返した部分の先端部を重ね合わせて連結部を形成するとともに、前記包装シート内面及び前記吸収体の外面をホットメルト接着剤を介して接着することにより、前記吸収体を前記包装シートで包装してなる吸収要素を製造し、
この製造した吸収要素を用いて吸収性物品を製造する、吸収性物品の製造方法において、
前記吸収体は、前記繊維の総重量よりも前記高吸収性ポリマー粒子の総重量が大きいものであり、
前記吸収体型内に形成される前記吸収体の前記高吸収性ポリマー粒子の含有率が、前記吸収体型の底側から入口側に向かうにつれて段階的又は連続的に高くなるように、前記集積を行い、
前記包装シートの連結部が、前記吸収性物品における前記吸収体の裏側となるように、前記吸収性物品に内蔵させる、
ことを特徴とする、吸収性物品の製造方法。
本項記載の製造方法によれば、前述した利点を有する吸収性物品を製造することができる。また、本項記載の製造方法では、積繊ドラムにおいて吸収体型の入口側に高吸収性ポリマー粒子を多く含有させるようにして集積を行うため、吸収体型の吸引孔に高吸収性ポリマー粒子が目詰まりしやすくなるといった問題が発生しにくい。
前記吸収体を前記包装シートの上面における幅向中間部分に転写した後、前記包装シートにおける前記吸収体の幅方向両側に位置する部分を前記吸収体の上側にそれぞれ折り返す前に、前記吸収体の上面にホットメルト接着剤を塗布する、請求項7記載の吸収性物品の製造方法。
包装シートの両側部分を折り返して吸収体の上面に接着するときには、吸収体の上面に予めホットメルト接着剤を塗布し、これに包装シートの両側部分を折り返して接着すると、吸収体の上面形状が安定するという利点がある。ここで、従来のように、積繊ドラムにおいて吸収体型の底側に高吸収性ポリマー粒子を多く含有させるようにして集積を行い、それを包装シート上に転写する(この際、吸収体の上下が入れ替わる)と、吸収体の上面側に高吸収性ポリマー粒子が多く含有されることになるため、吸収体の上面にホットメルト接着剤を塗布したときにその塗布力により高吸収性ポリマー粒子が飛散しやすいとうい問題点もある。これに対して本発明では、積繊ドラムにおいて吸収体型の底側から入口側に向かうにつれて高吸収性ポリマー粒子の含有率が段階的又は連続的に高くなるようにして集積を行うため、吸収体の上面にホットメルト接着剤を塗布する際、高吸収性ポリマー粒子の含有率は吸収体の上面側ほど低くなり、高吸収性ポリマー粒子は飛散しにくいものとなる。
前記製造した吸収要素を上下反転した後、その上側に当該吸収性物品において前記吸収体の表側に装備される部材を取り付けるとともに、その下側に当該吸収性物品において前記吸収体の裏側に装備される部材を取り付ける、請求項7又は8記載の吸収性物品の製造方法。
このように積繊ドラム直後の向きのまま吸収要素を製造した後に、吸収要素の向きを上下反転し、その上下両側に部材を取り付けるようにすると、既存設計に対する応用が容易となるため好ましい。
図1~図6は、パンツタイプ使い捨ておむつの一例を示している。断面図における点模様部分はその表側及び裏側に位置する各構成部材を接合する接合手段としての接着剤を示しており、ホットメルト接着剤などのベタ、ビード、カーテン、サミット若しくはスパイラル塗布などにより、また弾性伸縮部材の固定部分はこれに代えて又はこれとともにコームガンやシュアラップ塗布などの弾性伸縮部材の外周面への塗布により形成されるものである。各構成部材を接合する接合手段としてはヒートシールや超音波シール等の素材溶着による固定手段を用いることもできる。
外装体12F,12Bは、前身頃Fを構成する部分である前側外装体12Fと、後身頃Bを構成する部分である後側外装体12Bとからなり、前側外装体12F及び後側外装体12Bは脚側で連続しておらず、離間されている。この離間距離12dは150~250mm程度とすることができる。図示しないが、この離間部分における内装体200の裏面の露出部分の一部(例えば前側外装体12Fと後側外装体12Bとの間に露出する部分の前後方向全体にわたるが、内装体200の前後端まで延びず、また幅方向両側縁も内装体200の両側縁までは達しない程度)又は全体を覆うように、不織布等からなる股間部カバーシートを貼り付けることもできる。また、図9及び図10に示すように、外装体12が、前身頃Fから後身頃Bにかけて股間を通り連続する一体的なものとすることもできる。つまり、前身頃F及び後身頃Bを個別に構成する外装体12F,12Bが前者の形態に相当し、前身頃F及び後身頃Bを一体的に構成する外装体12が後者の形態に相当する。
内装体200の形状、構造は特に限定されず、例えば以下に述べる形状、構造を採用することができる。内装体200は任意の形状を採ることができるが、図示の形態では長方形である。内装体200は、図3~図5に示されるように、装着者の肌側となる液透過性トップシート30と、液不透過性シート11と、これらの間に介在された吸収要素50とを備えているものであり、吸収機能を担う本体部である。符号40は、トップシート30を透過した液を速やかに吸収要素50へ移行させるために、トップシート30と吸収要素50との間に設けられた中間シート(セカンドシートとも呼ばれる)を示しており、符号60は、内装体200の両脇に排泄物が漏れるのを防止するために、内装体の吸収面の幅方向両側に沿って延在された、装着者の脚周りに向かって立ち上がる部分である脚周りギャザー60を示している。
トップシート30は、有孔又は無孔の不織布や、多孔性プラスチックシート等、液透過性素材であれば特に限定無く利用できるが、図3及び図4に示す形態のようにトップシート30が脚周りギャザー60の液不透過性シート64の被覆材を兼ねる場合には不織布が用いられる。また、このうち不織布は、その原料繊維が何であるかは、特に限定されない。例えば、ポリエチレンやポリプロピレン等のオレフィン系、ポリエステル系、ポリアミド系等の合成繊維、レーヨンやキュプラ等の再生繊維、綿等の天然繊維などや、これらから二種以上が使用された混合繊維、複合繊維などを例示することができる。さらに、不織布は、どのような加工によって製造されたものであってもよい。加工方法としては、公知の方法、例えば、スパンレース法、スパンボンド法、サーマルボンド法、メルトブローン法、ニードルパンチ法、エアスルー法、ポイントボンド法等を例示することができる。例えば、柔軟性、ドレープ性を求めるのであれば、スパンボンド法、スパンレース法が、嵩高性、ソフト性を求めるのであれば、エアスルー法、ポイントボンド法、サーマルボンド法が、好ましい加工方法となる。
図7及び図8に示す形態のように、トップシート30の裏側に、トップシートより親水性に優れる中間シート(「セカンドシート」とも呼ばれている)40を設けることができる。この中間シート40は、吸収した液の吸収体からの逆戻り現象を防止し、トップシート30上のさらっとした肌触りを確保するためのものである。中間シート40は省略することもできる。
吸収体56の裏側に設けられる液不透過性シート11の素材は、特に限定されるものではないが、例えば、ポリエチレンやポリプロピレン等のオレフィン系樹脂等からなるプラスチックフィルムを例示することができる。液不透過性シート11には、近年、ムレ防止の観点から好まれて使用されている不透液性かつ透湿性を有する素材を用いることが好ましい。透湿性を有するプラスチックフィルムとしては、ポリエチレンやポリプロピレン等のオレフィン系樹脂中に無機充填剤を混練して、シートを成形した後、一軸又は二軸方向に延伸して得られた微多孔性プラスチックフィルムが広く用いられている。
吸収要素50は、吸収体56と、この吸収体56の全体を包む包装シート58とを有する。
吸収体56は、パルプ繊維や合成繊維等と、高吸収性ポリマー粒子とを混合集積したものである。吸収体56の繊維目付けとしては、綿状パルプや短繊維を積繊する場合は、例えば100~300g/m2程度とすることができる。合成繊維を用いる場合、その繊度は例えば1~16dtex、好ましくは1~10dtex、さらに好ましくは1~5dtexとすることができる。
包装シート58の素材としては、ティッシュペーパ、特にクレープ紙、不織布、ポリラミ不織布、小孔が開いたシート等の液透過性素材を用いることができる。ただし、高吸収性ポリマー粒子が抜け出ないシートであるのが望ましい。クレープ紙に換えて不織布を使用する場合、親水性のSMS不織布(SMS、SSMMS等)が特に好適であり、その材質はポリプロピレン、ポリエチレン/ポリプロピレン複合材などを使用できる。目付けは、5~40g/m2、特に10~30g/m2のものが望ましい。
包装シート58の内面は、吸収体56と対向する部分の全体がホットメルト接着剤H1,H2を介して吸収体56の外面に接着される。また、連結部58cにおける包装シート58の端部が重なり合う部分も、ホットメルト接着剤H3を介して接合される。
図13~図15は、上述した吸収要素50を製造するための設備・工程の一例を示している。図13及び図14に示される区間(a)~(d)が、図16に示される(a)~(d)の断面状態と対応している。この製造設備100では、まずパルプシート56Fを解繊機101で解繊して得られるパルプ繊維及び高吸収性ポリマー粒子56Pが、横向きに配置され回転駆動される積繊ドラム102の上方から供給される。積繊ドラム102の外周面には、回転方向を前後方向とする吸収体型102mが凹状に形成されるとともに、吸収体型102mの底面に多数の図示しない吸引孔が形成されており、パルプ繊維及び高吸収性ポリマー粒子の供給位置で、吸収体型102m内の吸引孔からの吸引により、吸収体型102m内にパルプ繊維及び高吸収性ポリマー粒子の混合物が集積されて吸収体56が形成される。
脚周りギャザー60は、内装体200の吸収面の幅方向両側に沿って延在された、装着者の脚周りに向かって立ち上がる部分であり、トップシート30上を伝わって横方向に移動する尿や軟便を遮断し、横漏れを防止するために設けられているものである。
明細書中で以下の用語が使用される場合、明細書中に特に記載が無い限り、以下の意味を有するものである。
・「高吸収性ポリマー粒子の含有率」は、重量百分率を意味する。
・「前後(縦)方向」とは腹側(前側)と背側(後側)を結ぶ方向を意味し、「幅方向」とは前後方向と直交する方向(左右方向)を意味する。
・「展開状態」とは、収縮や弛み無く平坦に展開した状態を意味する。
・「伸長率」は、自然長を100%としたときの値を意味する。
・「目付け」は次のようにして測定されるものである。試料又は試験片を予備乾燥した後、標準状態(試験場所は、温度20±5℃、相対湿度65%以下)の試験室又は装置内に放置し、恒量になった状態にする。予備乾燥は、試料又は試験片を相対湿度10~25%、温度50℃を超えない環境で恒量にすることをいう。なお、公定水分率が0.0%の繊維については、予備乾燥を行わなくてもよい。恒量になった状態の試験片から米坪板(200mm×250mm、±2mm)を使用し、200mm×250mm(±2mm)の寸法の試料を切り取る。試料の重量を測定し、20倍して1平米あたりの重さを算出し、目付けとする。
・「厚み」は、自動厚み測定器(KES-G5 ハンディー圧縮試験機)を用い、荷重:10gf/cm2、及び加圧面積:2cm2の条件下で自動測定する。
・吸水量は、JIS K7223-1996「高吸水性樹脂の吸水量試験方法」によって測定する。
・「吸水速度」は、2gの高吸収性ポリマー及び50gの生理食塩水を使用して、JIS K7224‐1996「高吸水性樹脂の吸水速度試験法」を行ったときの「終点までの時間」とする。
・「剛軟度」は、JIS L 1096:2010「織物及び編物の生地試験方法」の「8.21.1 A法(45°カンチレバー法)」を意味する。
・「溶融粘度」は、JIS Z 8803にしたがい、ブルックフィールドB型粘度計(スピンドルNo.027)を用いて、温度140℃で測定されるものである。
・試験や測定における環境条件についての記載が無い場合、その試験や測定は、標準状態(試験場所は、温度20±5℃、相対湿度65%以下)の試験室又は装置内で行うものとする。
・各部の寸法は、特に記載が無い限り、自然長状態ではなく展開状態における寸法を意味する。
Claims (9)
- 吸収体が包装シートで包装されてなる吸収要素を備え、
前記吸収体は、繊維及び高吸収性ポリマー粒子が混合集積されたものであり、
前記包装シートは、前記吸収体の表側に位置する中間部分と、この中間部分から前記吸収体の裏側に折り返された両側部分とを有するとともに、この包装シートの両側部分の先端部が前記吸収体の裏側で重なり合わされて連結部が形成されており、
前記吸収体は、前記繊維の総重量よりも前記高吸収性ポリマー粒子の総重量が大きいものであるとともに、
前記吸収体の前記高吸収性ポリマー粒子の含有率が、裏側から表側に向かうにつれて段階的又は連続的に高くなっている、
ことを特徴とする吸収性物品。 - 前記包装シートの内面は、前記吸収体と対向する部分の全体がホットメルト接着剤を介して前記吸収体の外面に接着されており、
前記包装シート及び前記吸収体を接着するホットメルト接着剤の使用量が、前記吸収体の表側よりも、前記吸収体の裏側における少なくとも幅方向両端部の領域の方が多い、
請求項1記載の吸収性物品。 - 前記吸収体の前後方向中間部に幅方向中央側に括れた括れ部が形成されており、
前記包装シート及び前記吸収体を接着するホットメルト接着剤の使用量が、前記吸収体の表側よりも多い領域は、前記括れ部の幅方向全体を含む領域とされている、
請求項2記載の吸収性物品。 - 前記吸収体の幅方向中間部に、厚み方向に貫通するスリットが前後方向に延在しており、
前記包装シート及び前記吸収体を接着するホットメルト接着剤の使用量が、前記吸収体の表側よりも多い領域は、前記スリットの幅方向両端部を含む領域とされている、
請求項2又は3記載の吸収性物品。 - 前記包装シート及び前記吸収体を接着するホットメルト接着剤の使用量が、前記吸収体の表側よりも多い領域は、ホットメルト接着剤層の積層数が前記吸収体の一方側よりも多い領域である、請求項2~4のいずれか1項に記載の吸収性物品。
- 前記包装シート及び前記吸収体を接着するホットメルト接着剤の使用量が、前記吸収体の表側よりも多い領域では、前記ホットメルト接着剤の塗布パターン及び種類の少なくとも一方が異なる複数のホットメルト接着剤層が積層されており、
前記吸収体の表側では、前記包装シート及び前記吸収体を接着するホットメルト接着剤の層が、前記複数のホットメルト接着剤の層のうち最も包装シート側に位置する層と塗布パターン及び種類が同じである、
請求項2~5のいずれか1項に記載の吸収性物品。 - 回転方向を前後方向とする凹状の吸収体型が外周面に形成されるとともに、吸収体型の底面に多数の吸引孔が形成され、横向きに配置されて回転駆動される積繊ドラムを用い、
前記吸引孔から吸引を行いつつ前記吸収体型内に繊維及び高吸収性ポリマー粒子の混合物を集積して吸収体を形成し、
前記吸収体型内に形成した吸収体を、包装シートの上面における幅向中間部分に転写し、前記包装シートにおける前記吸収体の幅方向両側に位置する部分を、前記吸収体の上側にそれぞれ折り返し、これら折り返した部分の先端部を重ね合わせて連結部を形成するとともに、前記包装シート内面及び前記吸収体の外面をホットメルト接着剤を介して接着することにより、前記吸収体を前記包装シートで包装してなる吸収要素を製造し、
この製造した吸収要素を用いて吸収性物品を製造する、吸収性物品の製造方法において、
前記吸収体は、前記繊維の総重量よりも前記高吸収性ポリマー粒子の総重量が大きいものであり、
前記吸収体型内に形成される前記吸収体の前記高吸収性ポリマー粒子の含有率が、前記吸収体型の底側から入口側に向かうにつれて段階的又は連続的に高くなるように、前記集積を行い、
前記包装シートの連結部が、前記吸収性物品における前記吸収体の裏側となるように、前記吸収性物品に内蔵させる、
ことを特徴とする、吸収性物品の製造方法。 - 前記吸収体を前記包装シートの上面における幅向中間部分に転写した後、前記包装シートにおける前記吸収体の幅方向両側に位置する部分を前記吸収体の上側にそれぞれ折り返す前に、前記吸収体の上面にホットメルト接着剤を塗布する、請求項7記載の吸収性物品の製造方法。
- 前記製造した吸収要素を上下反転した後、その上側に当該吸収性物品において前記吸収体の表側に装備される部材を取り付けるとともに、その下側に当該吸収性物品において前記吸収体の裏側に装備される部材を取り付ける、請求項7又は8記載の吸収性物品の製造方法。
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EP3357470A1 (en) | 2018-08-08 |
TW201713292A (zh) | 2017-04-16 |
TWI705805B (zh) | 2020-10-01 |
CN108024886A (zh) | 2018-05-11 |
KR102563863B1 (ko) | 2023-08-03 |
KR20180063072A (ko) | 2018-06-11 |
JP6150357B2 (ja) | 2017-06-21 |
US10940056B2 (en) | 2021-03-09 |
US20180256416A1 (en) | 2018-09-13 |
CN108024886B (zh) | 2021-07-06 |
EP3357470B1 (en) | 2022-10-05 |
EP3357470A4 (en) | 2019-05-15 |
JP2017064128A (ja) | 2017-04-06 |
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