JP4033580B2 - Absorbent articles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an absorbent article such as a disposable diaper having excellent leakage prevention properties.
[0002]
[Prior art and problems to be solved by the invention]
In absorbent articles such as disposable diapers, since it is an important issue to effectively prevent leakage, various types of three-dimensional guards formed on the left and right sides of the absorbent body have been proposed (Japanese Patent Publication No. 6-93901). Issue gazette).
Such a three-dimensional guard fits to the wearer with its free edge standing upwards, forms a pocket between the three-dimensional guard and the surface sheet, and temporarily stocks excrement in the pocket. It prevents the excrement from flowing on the surface of the top sheet and causing leakage.
However, the three-dimensional guard in the conventional absorbent article may not fully exhibit its uprightness, may not have sufficient fit, and may not be formed with a pocket that is large enough to prevent leakage. .
[0003]
Accordingly, an object of the present invention is to provide an absorbent article such as a disposable diaper which is excellent in the standing property of a three-dimensional guard and excellent in fit, breathability and leakage prevention.
[0004]
[Means for Solving the Problems]
The present invention includes a liquid-permeable surface sheet, a liquid-impermeable leak-proof sheet, and a liquid-retaining absorbent body, which are substantially vertically long and have a three-dimensional guard elastic member on both left and right sides in the longitudinal direction. In the absorbent article having the three-dimensional guard , the side flap forming material extends on the surface of the leak-proof sheet so that both sides thereof extend outward in the width direction of the absorbent article from the left and right side edges of the absorbent body. At least a part of the front part and the rear part of the three-dimensional guard elastic member are arranged on the three-dimensional guard, and are arranged so as not to be parallel to the free edge of the three-dimensional guard. An intermediate portion of the three-dimensional guard elastic member is arranged so as to be sandwiched and fixed by the leakproof sheet and the side flap forming material on the back surface side of the absorber, edge The, along the free-acquaintance end, wherein the solid guard elastic member by providing an absorbent article another string-like elastic member is disposed, is obtained by achieving the above object.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of the absorbent article of the present invention will be described.
The disposable diaper 1 as an absorbent article according to the first embodiment includes a liquid-permeable surface sheet 2, a liquid-impermeable leak-proof sheet 3, and a liquid-retaining absorbent body as shown in FIGS. 4 and a pair of three-dimensional guards 6 and 6 ′ which are substantially vertically long and have three-dimensional guard elastic members 64 and 64 ′ on both left and right sides in the longitudinal direction.
[0006]
The disposable diaper 1 of the present embodiment is formed by sandwiching and fixing the absorbent body 4 between the top sheet 2 and the leak-proof sheet 3. Moreover, although the shape of the absorber 4 can employ | adopt various shapes, such as an hourglass shape, trapezoid shape, and a rectangular shape, in this embodiment, it is a rectangular shape.
In addition, a waist elastic member 81 is disposed in each of the waist openings 8 in the abdominal side A located on the wearer's abdomen side and the back side B located on the dorsal side at the time of wearing, and waist gathers are formed respectively. ing. Fastening tapes 11 for wearing disposable diapers are respectively provided on the left and right side edges B1, B2 of the back side B.
The three-dimensional guards 6, 6 ′ are formed by arranging a belt-like sheet material 61 for forming a three-dimensional guard so as to extend outward from the left and right side edges of the absorber 4. The free edge 63 is made parallel to the longitudinal direction of the disposable diaper 1. The sheet material 61 is fixed to the top sheet 2 above the side portion of the absorber 4, and a base end 60 is formed by the fixed portion. The sheet material 61 has its longitudinal edge 61 a fixed to the top sheet 2 and a side flap forming material 5 described later on the side of the waist opening 8.
[0007]
Side flap forming members 5 are arranged on the surface of the leak-proof sheet 3 so that both side portions extend outward in the width direction of the disposable diaper from the left and right side edges of the absorbent body 4. And in the width direction outward from the left and right side edges of the absorbent body 4, the sheet material 61 and the side flap forming material 5 are laminated, and a pair of left and right side flap portions 7 that come into contact with the wearer's legs when worn is provided. Is formed. Thus, by forming the side flap part 7 with the side flap formation material 5 and the sheet material 61, it can be set as the disposable diaper which is excellent in air permeability and is not stuffy.
Further, the side flap forming material 5 has an hourglass shape with a narrowed center in the longitudinal direction, and the shape of the side edge located at the edge of the side flap portion 7 of the sheet material 61 is the same shape as the side flap forming material 5. ing.
[0008]
Thus, the three-dimensional guard elastic members 64 and 64 ′ are arranged so that the intermediate portions 64 b and 64 b ′ in the longitudinal direction are located on the back side of the absorber 4.
[0009]
More specifically, the three-dimensional guard elastic members 64 and 64 ′ have their front portions 64a and 64a ′ and rear portions 64c and 64c ′ (one-dot chain line portion in FIG. 2) on the three-dimensional guards 6 and 6 ′, respectively. The three-dimensional guards 6 and 6 'are arranged so as not to be parallel to the free edge ends 63 and 63.
However, a part of the three-dimensional guard elastic members 64 and 64 ′ is in a state of being parallel or nearly parallel to the free edge 63 so as not to impair the effects of the invention in the vicinity of or part of the ends of the front and rear portions. May be.
Here, the “intermediate part” means a part located in the middle part of the abdomen and back side of the absorbent article (the crotch part that is substantially located in the crotch of the wearer when worn) “Front part” and “rear part” mean parts substantially located on the abdominal side and the back side.
[0010]
The three-dimensional guard elastic members 64 and 64 ′ are arranged by being bonded to the sheet material 61 via an adhesive so as to be inclined with respect to the free edge 63 in the three-dimensional guard 6, and the intermediate portions 64 b and 64 b ′. Is arranged on the side edge side of the absorbent body 4 along the surface of the leak-proof sheet 3. Specifically, the three-dimensional guard elastic members 64, 64 ′ have their front portions 64 a, 64 a ′ and rear portions 64 c, 64 c ′ located near the free edge 63, and the end of the disposable diaper 1. It is arranged and fixed so as to go from the free edge 63 to the base 60 of the three-dimensional guards 6, 6 ′ as it goes from the portion toward the center in the longitudinal direction. Further, the intermediate portions 64 b and 64 b ′ are arranged so as to be sandwiched and fixed by the leak-proof sheet 3 and the side flap forming material 5 on the back surface side of the absorber 4.
The pair of three-dimensional guard elastic members 64, 64 ′ are disposed across the disposable diaper 1 in the width direction on the back surface side of the absorber 4 so as to be X-shaped on the back surface side of the absorber 4. . Accordingly, the pair of three-dimensional guard elastic members 64 and 64 ′ intersect each other at the center in the width direction and the center in the length direction of the diaper, and the front portion 64 a of one three-dimensional guard elastic member 64 is one of the three-dimensional guard 6. The rear portion 64c is positioned on the other three-dimensional guard 6, and the front portion 64a 'of the other three-dimensional guard elastic member 64' is positioned on the other three-dimensional guard 6 and the rear portion 64c. 'Is located on one solid guard 6'.
In the present embodiment, the three-dimensional guard elastic members 64 and 64 'each have a string shape.
[0011]
The “front portion” and “rear portion” of the three-dimensional guard elastic members 64 and 64 ′ are regions disposed on the three-dimensional guard in the three-dimensional guard elastic members 64 and 64 ′, and mainly the ventral side portion of the disposable diaper. And a portion located on the back side. Further, the “intermediate portion” is a region sandwiched between the front portion and the rear portion, and includes a region where the three-dimensional guard elastic members 64 and 64 ′ are arranged at the lower portion of the absorbent body, and mainly a crotch portion of the disposable diaper. It is a part located in.
[0012]
In the three-dimensional guard 6, the length L1 of the portion where the front portions 64a and 64'a and the rear portions 64c and 64c 'of the three-dimensional guard elastic members 64 and 64' are arranged is determined by the upward standing and leakage of the three-dimensional guard. From the viewpoint of prevention, the thickness is preferably 3 to 30 cm, more preferably 5 to 20 cm.
Further, the length L2 of the diaper where the intermediate portions 64b and 64b 'are located is preferably 3 to 30 cm, more preferably 5 to 20 cm, from the viewpoint of fit of the diaper to the wearer.
The solid guard elastic members 64 and 64 'may be arranged in a plurality of 2 to 20, and the distance between the solid guard elastic members is preferably 0.2 to 5 cm, and the space between the elastic members is between It may not be equally spaced. By arranging a plurality of them, the effects of solid standing and fit are more manifested.
[0013]
A string-like elastic member 65 is disposed along the free edge 63 at the free edge 63 of the three-dimensional guard 6 .
Incidentally, between the base end 60 and the free edge end 63 of the three-dimensional guard 6, further string-like elastic member 65 ', as in the second embodiment described later, substantially parallel along the free edge end 63 placed in, and a portion stereoscopic guard elastic member 64 of the elastic member 65 'may be crossed on the three-dimensional guard 6. At this time, the elastic members 65 and 65 ′ can be arranged in total from 2 to 20, and the distance between the elastic members 65 and 65 ′ in this case is preferably 0.2 to 5 cm. The elastic members may not be equally spaced.
Further, at least one elastic member of the three-dimensional guard elastic members 64, the elastic member 65, after taking the above embodiment the front and rear portions, (1) addition of the three-dimensional guard proximal or al absorber (2) Arranged on the back side of the absorbent body, more preferably the edge of the three-dimensional guard elastic member is located near the side edge of the opposite absorbent body (3) Once wound on the back side of the absorber as in the form of (2) , it may be placed and fixed so that the edge is positioned on the opposite side flap part . As described above, in the case of (1) , the elastic member is interlocked with the tape fastener at the time of mounting, and the standing property and the fitting property of the three-dimensional guard are further improved. In the case of (2) , the fit (waist, waistline) can be further improved. In the case of (3) , both the effects of (1) and (2) are achieved. In the case of (1) and (3) , it is preferable that the end edge of the elastic member is arranged up to the vicinity of the tape fastener in the unfolded type diaper and the vicinity of the side edge end part in the pant type diaper. The “front portion” and the “rear portion” referred to here include even the longitudinal end portion of the three-dimensional guard.
[0014]
Next, the formation material of each member which comprises the disposable diaper of this embodiment is demonstrated.
As a material for forming the top sheet 2, the leak-proof sheet 3, the absorber 4, the waist elastic member 81, and the fastening tape 11, those usually used for disposable diapers can be used without particular limitation.
[0015]
The sheet material 61 and the side flap forming material 5 are preferably breathable sheets, and the air permeability is preferably 500 sec / 100 cc or less, more preferably 100 sec / 100 cc or less, and 20 sec / 100 cc or less. More preferably. By setting the air permeability to 500 sec / 100 cc or less, the ventilation effect is good, the inside of the diaper is not stuffy when worn, and adverse effects on the wearer's skin such as fogging are reduced.
The water pressure resistance (water repellency) of the sheet material 61 and the side flap forming material is preferably 3.0 g / cm ² or more, and more preferably 5.0 g / cm ² or more. By setting the water pressure resistance to 3.0 g / cm ² or more, the excretion of the excrement is small and the leakage preventing effect is enhanced.
Further, the strength (breaking strength) in the CD direction of the sheet material 61 and the side flap forming material 5 is preferably 1000 cN / 50 mm or more, and more preferably 1200 cN / 50 mm or more. By setting the strength to 1000 cN / 50 mm or more, it is less likely that the material is broken at or around the portion where the sheet material is applied at the time of mounting and the fit of the diaper is lowered.
Examples of the material for forming the sheet material 61 and the side flap forming material 5 that satisfy such conditions include spunbond, thermal bond, spunbond-meltblown nonwoven fabric (SM), spunbond-meltblown-spunbond nonwoven fabric (SMS), and span. Bond-melt blown-melt blown-spun bond nonwoven fabric (SMMS), heat roll, air through, melt blown, spunlace nonwoven fabric and the like.
[0016]
Further, the sheet material 61 and the side flap forming material 5 may have stretchability, and as a forming material in that case, a liquid permeable or liquid impermeable elastic sheet, an elastic net, or a composite is formed. Examples include elastic panel materials. From the viewpoint of wearing comfort, various non-woven fabrics (including elastic and non-elastic materials) or various non-woven fabrics (including elastic and non-elastic materials) have elasticity (thermoplastic elastomers). It is preferable to use an elastic panel material combined with a film and a net.
Further, when stretchable materials are used for the sheet material 61 and the side flap forming material 5, there is no particular limitation on the direction of expansion / contraction, but those having elasticity in the direction perpendicular to the longitudinal direction of the diaper, parallel Those having elasticity in the direction and those having elasticity in both directions are preferred.
[0017]
The air permeability and water pressure resistance are measured as follows.
[Air permeability]
It measured according to JIS-P8117. That is, the sheet was cut into a size of 70 × 70 mm, and the time required for 100 ml of air to permeate was measured using an air permeability measuring device (Oken air permeability measuring device).
(Water pressure resistance)
It measured according to JIS-L1092.
Breaking strength: A test piece having a width of 25 mm in the flow direction (MD) of the original fabric and a length of 150 mm in the direction (CD) perpendicular to the flow direction was cut out. The test piece was subjected to a tensile test using a Tensilon tensile tester (manufactured by Orientec Co., Ltd.) with a chuck distance of 50 mm and a CD direction tensile speed of 300 mm / min, and the strength at break was measured.
[0018]
Moreover, although the said leak-proof sheet 3 can use normally what is used for a disposable diaper without a restriction | limiting, it may have a stretching property. Liquid impermeable film sheets and nonwoven fabrics that satisfy such conditions include conventional polymers such as polyolefin (polyethylene, polypropylene, etc.) and polyesters that contain inorganic substances such as calcium carbonate. Sheet obtained by subjecting resin sheet to secondary processing such as heat treatment, embossing, opening treatment or slit treatment; polyolefin (polyethylene, metallocene polyethylene, etc.), polyurethane, polyester, polyether, polystyrene, styrene -Butadiene-styrene copolymer (SBS), styrene-isoprene-styrene copolymer (SIS), styrene-ethylene-butylene-styrene copolymer (SEBS), styrene-ethylene-propylene-styrene copolymer (SEPS) Thermoplastic error such as Tomashito, thermoplastic elastomers and spunbond using an elastic material, thermal bonding, SM, SMS, SMMS, heat roll, air-through, meltblown, spun lace nonwoven fabric, and the like.
Of these forming materials, those having a water vapor transmission rate of 0.5 g / [100 cm ² · hr] or more are preferable, those having a water pressure resistance of 5.0 g / cm ² or more are preferable, and 50 g / cm ² or more. Are more preferred. The moisture permeability was measured according to JIS-Z0208.
[0019]
As the three-dimensional guard elastic members 64, 64 ′ and the elastic member 65, conventionally known elastic members can be used without limitation, but the stress of the three-dimensional guard elastic members 64, 64 ′ is preferably 10 gf to 1000 gf. The stress of the elastic member 65 is preferably 10 gf to 1000 gf. Here, the stress can be measured by the following measuring method.
[Method for measuring stress of elastic member]
The elastic member was cut out to a length of 150 mm, and a tensile test was performed using a Tensilon tensile tester (manufactured by Orientec Co., Ltd.) with a chuck of 100 mm and a pulling speed of 300 mm / min, and the stress at 100% elongation was measured.
In addition, when making the stress of the elastic member 65 and the three-dimensional guard elastic members 64 and 64 'arranged at the free edge 63 different, different materials may be used, or the expansion rate may be changed with the same material. Also good.
[0020]
The disposable diaper of this embodiment can be used similarly to a normal unfolded disposable diaper.
And in the disposable diaper of this embodiment, since the three-dimensional guard elastic members 64 and 64 ′ are provided as described above, the three-dimensional guard 6 has a good standing property, and the space between the pair of three-dimensional guards 6 is appropriately widened. The absorbent surface can be surely aligned with the wearer's urination portion, and the excrement can be absorbed immediately and the excrement can be prevented from flowing in the disposable diaper. For this reason, it is excellent in leakage prevention property.
[0021]
The disposable diaper according to the present embodiment covers the absorbent body 4 with the leak-proof sheet 3 and the top sheet 2 and then arranges the three-dimensional guard elastic members 64 and 64 ′ in a predetermined shape while the side flap forming material 5 and the sheet material. It is obtained by arranging 61 or the like.
[0022]
Next, another embodiment of the present invention will be described.
In the following description, differences from the above-described first embodiment will be particularly described. For points that are not particularly described, the description given in the first embodiment is applied as appropriate.
In the disposable diaper 1 of the second embodiment shown in FIG. 5, the three-dimensional guard elastic member 64 is curved without intersecting on the back side of the absorber 4, and each three-dimensional guard elastic member 64 is respectively The front part 64a and the rear part 64c of one solid guard elastic member are respectively positioned on the same solid guard.
Further, the elastic members 65 and 65 ′ arranged along the free edge are arranged at the free edge 63 and substantially the middle part between the free edge 63 and the base end 60, and are arranged at the middle part. The elastic member 65 ′ and the three-dimensional guard elastic member 64 intersect on the three-dimensional guard 6. Here, the elastic members 65 and 65 ′ have been described by exemplifying those in which two are arranged one by one, but these numbers can be 2 to 20 in total, In this case, the distance between the elastic members 65 and 65 ′ is preferably 0.2 to 5 cm, and the distance between the elastic members may not be equal.
Thus, although the arrangement | positioning form of the solid guard elastic member in the back surface side of the absorber 4 is arbitrary, from the point of the fitting property at the time of wear, distance T between each solid guard elastic member in the case of arranging without crossing Is preferably 20 cm or less, more preferably 15 cm or less, and still more preferably 10 cm or less.
[0023]
In addition, this invention is not restrict | limited to the above-mentioned embodiment, For example, it can change variously as follows.
In the description of the above-described embodiment, the unfolded disposable diaper has been illustrated and described. However, the present invention is not limited to this, and is applicable to a pants-type disposable diaper, and further to an incontinence pad or a sanitary napkin. it can. In the case of a pants-type disposable diaper, the above-mentioned “substantially vertically long” means that the joint portion of the pants-type disposable diaper is peeled to be vertically elongated.
Moreover, in the above-mentioned embodiment, although the thing in which the gathers were not formed in the side flap part 7 was illustrated and demonstrated, this invention is not restrict | limited to this, It is good also as a form which has a gather.
Moreover, although the thing which has the base end 60 of the three-dimensional guard 6 on the absorber 4 is illustrated, you may make it the base end 60 be located on the side flap part 7. FIG.
In addition, a pair of leg gathers may be formed by separately providing an elastic member on the side flap portion 7.
[0024]
A three-dimensional guard may be provided in the waist, and the periphery of the portion that comes into contact with the excretory part may be surrounded by a three-dimensional guard to further improve leakage prevention. And the solid guard provided in a waist part may arrange | position and form the solid guard elastic member 64 like the above-mentioned 1st and 2nd embodiment.
The end portion of the three-dimensional guard elastic member may be alternately provided with a portion toward the free edge end side and a portion toward the base end side toward the central portion in the longitudinal direction.
Moreover, you may divide | segment an absorber into the longitudinal direction and / or width direction of a disposable diaper, or make a cut | interruption. Specifically, the absorber is formed by arranging three elongated rectangular absorbers in parallel, or by making cuts on both sides and both ends, thereby stabilizing the formation state of the opening 12 and shifting. You may prevent falling.
[0025]
Moreover, a part of intermediate part of the three-dimensional guard may be joined to the upper side part of the absorber or the side flap part.
Moreover, you may laminate a liquid-impermeable film in a part between the base end part of a solid guard, and a free end part. In this case, the exudation of excrement from the three-dimensional guard can be more effectively prevented, and the leakage prevention effect is improved.
Moreover, it is good also as a structure which covers the lower part and side part of an absorber using a water-repellent mount, a nonwoven fabric, and a liquid-impermeable film as a material which comprises an absorber. In this case, it is effective to prevent excrement once absorbed by the wearer's body pressure from oozing out from the absorber. Moreover, the back side expansion-contraction part formed by arranging several back side elastic members along the width direction of an absorbent article may be provided in the back side part located in a wearer's back side. In this case, the fit on the back side of the diaper can be further improved.
[0026]
In the first and second embodiments described above, the three-dimensional guard-forming sheet material 61 can be disposed so as to cover the back surface side of the absorber 4. That is, the sheet material 61 may be disposed so as to be positioned between the back sheet 3 and the absorber 4 or between the back sheet 3 and the side flap forming material 5. The part 7 is formed only by the side flap forming material 5.
By taking such a form, the leakage preventing effect (sheet material having water pressure resistance) of the sheet material 61 can be imparted to the back side of the absorber (outside the diaper). Further, since the side flap portion is formed only by the side flap forming material 5 and does not need to be bonded to the sheet material 61, the air permeability is improved.
[0027]
【The invention's effect】
The absorbent article of this invention is excellent in the standing property of a three-dimensional guard, and excellent in fitting property and leakage prevention property.
[Brief description of the drawings]
FIG. 1 is a perspective view of a disposable diaper according to a first embodiment of the present invention as viewed from a leak-proof sheet side in a natural state.
FIG. 2 is a plan view showing the top sheet side in a state where the elastic member of the disposable diaper shown in FIG. 1 is stretched.
FIG. 3 is a cross-sectional view taken along line XX of FIG.
4 is a cross-sectional view taken along line YY in FIG. 2;
FIG. 5 is a plan view (corresponding to FIG. 2) of a disposable diaper as another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Disposable diaper 10 Main body 11 Fastening tape 2 Top sheet 3 Leak-proof sheet 4 Absorber 5 Side flap formation material 6 Solid guard 60 Base 61 Sheet material 63 Free edge 64, 64 'Solid guard elastic member 64a front part 64b middle part
64c Rear part 65 Elastic member 7 Side flap part 8 Waist opening part 81 Waist elastic member A Abdominal side part B Back side part

Claims (4)

A pair of three-dimensional guards having a liquid-permeable surface sheet, a liquid-impermeable leak-proof sheet, and a liquid-retaining absorbent body, which are substantially vertically long and have three-dimensional guard elastic members on both left and right sides in the longitudinal direction. In the absorbent article to comprise,
On the surface of the leak-proof sheet, side flap forming materials are arranged so that both sides thereof extend outward in the width direction of the absorbent article from the left and right side edges of the absorber,
At least a part of each of the front part and the rear part of the three-dimensional guard elastic member is arranged on the three-dimensional guard, and is arranged so as not to be parallel to the free edge of the three-dimensional guard,
The middle part of the three-dimensional guard elastic member is arranged so as to be sandwiched and fixed by the leakproof sheet and the side flap forming material on the back side of the absorber,
An absorbent article having a string-like elastic member different from the three-dimensional guard elastic member along the free edge at the free edge of the three-dimensional guard . The following end of the front and rear portions of the three-dimensional guard elastic member is located on the free edge side of the three-dimensional guard, and towards the longitudinal center side of the absorbent article in said front portion and said rear portion are arranged fixed to face the base end from the free edge of the three-dimensional guard and the middle portion of the three-dimensional guard elastic members are secured to the rear surface side of the absorbent body,
Furthermore, the absorbent article of sheet material for stereoscopic guard formed claim 1 Symbol placement is arranged so as to cover the rear surface side of the absorbent body. 3. The absorbent article according to claim 1, wherein the string-like elastic member is disposed between the base end and the free edge of the three-dimensional guard substantially in parallel along the free edge. The absorbent article according to claim 3, wherein the string-like elastic member and the three-dimensional guard elastic member intersect on the three-dimensional guard.

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