JP2000288020A - Throw-away diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a throw-away diaper which is lightweight and compact, is light and easily portable even when plural sheets are packaged as a package and has an excellent effect of preventing the leakage of wine. SOLUTION: The product basis weight of the throw-away diaper having a liquid permeable front surface sheet 2, a liquid impermeable rear surface sheet 3 and a liquid holdable absorber 4 interposed between both sheets is 50 to 220 g/m2. The portion where the absorber is arranged has a portion of >=3.0 g/sec in absorption rate of the body fluid and a portion of >=75 g/100 cm2 in the saturation absorption rate of the body fluid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposable diaper which is lightweight and compact, is easy to carry as a package by wrapping a plurality of wrappers, and has an excellent urine leakage preventing effect.

[0002]

2. Description of the Related Art Disposable diapers have been made more compact and convenient to carry because of improvements in the construction and materials used. However, the weight of the package body in which a plurality of disposable diapers are still stored is quite heavy, and some of them exceed 3 kg, so that the burden of carrying the package body is considerably large. As a method of reducing the weight of the package, it is conceivable to reduce the number of disposable diapers per package, but the distribution efficiency is reduced, which leads to an increase in the unit price and an increase in the number of purchases by the user. Would.

In addition, if the number of water absorbing members is simply reduced in order to reduce the weight per disposable diaper, leakage will increase. For example, training diapers for infants and light incontinence diapers for adults are lighter and more compact than normal diapers, but if they are used in the same way as normal diapers, they will leak. Often occur, which makes it unusable for use.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a disposable diaper which is lightweight and compact, which is light and easy to carry even when a plurality of sheets are wrapped to form a package, and which has an excellent effect of preventing urine leakage. It is in.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a disposable diaper having a liquid-permeable top sheet, a liquid-impermeable back sheet and a liquid-retentive absorber interposed between the two sheets. The amount is 50 to 220 g / m ² , and the portion where the absorber is disposed has a body fluid absorption rate of 3.0 g.
/ S and a saturated absorption of body fluid of 75 g / 1
The above object has been achieved by providing a disposable diaper having a portion of 00 cm ² or more.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on preferred embodiments. As shown in FIGS. 1 to 4, a disposable diaper 1 according to one embodiment of the present invention includes a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and a liquid interposed between the sheets 2 and 3. A holding absorbent 4,
Left and right side edges B of the back side B located on the back side of the wearer
This is a so-called deployable disposable diaper in which a fastening tape 11 for fastening is arranged at 1 and B2.

[0007] Specifically, the disposable diaper 1 of the present embodiment.
Has an absorber 4, a back sheet 3 having substantially the same size as the absorber 4, and a top sheet 2 arranged to cover the surface and side surfaces of the absorber 4, as shown in FIGS. are doing.
The outer layer nonwoven fabric 5 is arranged on the back surface side of the back sheet 3, and the water repellent nonwoven fabric 61 for forming the three-dimensional gathers 6 is arranged on the top sheet 2 on the side edge side of the absorber 4. The outer nonwoven fabric 5 and the water-repellent nonwoven fabric 61 are both extended to the left and right side edges of the absorber 4, and hold and fix the leg elastic members 71 to form a pair of left and right leg gathers 7. At the free edge portion 62 of the water-repellent nonwoven fabric 61, a three-dimensional gather elastic member 63 for forming the three-dimensional gather 6 is arranged. At both longitudinal ends of the disposable diaper 1, the outer nonwoven fabric 5 and the topsheet 2 extend from both longitudinal ends of the absorber 4 to form a pair of waist portions 8. The waist portion 8 has a sheet-like waist elastic member 8.
1 are arranged and fixed by the topsheet 2 and the outer layer nonwoven fabric 5. The absorber 4 is made of an absorbent polymer 42
And a backing sheet 43 for wrapping the nonwoven fabric 41, and a compression-recoverable uneven sheet 44 is disposed between the absorber 4 and the back sheet 3. . On the surface of the outer layer nonwoven fabric 5 in the abdominal part A,
A fastening portion 51 for fastening the fastening tape 11 is provided.

Thus, the disposable diaper of the present embodiment is
The product basis weight is 50 to 220 g / m ² (preferably 100 to
200 g / m ² ), and the portion where the absorber is disposed has a portion having a body fluid absorption rate of 3.0 g / sec or more (preferably 3.5 g / sec or more) and a saturated absorption amount of the body fluid. 75 g / 100 cm ² or more (preferably 80 g / 100 cm ²
cm ² or more).

Here, the portion where the absorber is disposed means a portion where the absorber is disposed inside when the disposable diaper is viewed in a plan view in a state where the disposable diaper is expanded in a plane. The “product basis weight”, the “body fluid absorption rate”, and the “body fluid saturation absorption amount” are values obtained as follows. Product basis weight: A disposable diaper is spread in a plane, and the area (m ² ) in that state is measured. Then, the weight (g) of the disposable diaper is divided by the measured area to obtain a product basis weight (g).
/ M ² ). Note that the area of the fastening tape is not included in the area serving as the basis for calculating the grammage. In the case of a pants-type disposable diaper, the joint between the left and right side edges of the back side and the left and right side edges of the abdomen is peeled off, and the area is measured in a state where it is developed in a plane I do.

[0010] Absorption rate of bodily fluid: An arbitrary portion on which the absorbent body of the disposable diaper is disposed is cut out to a size of 100 mm in the longitudinal direction × 100 mm in the width direction to obtain a test piece (the dimension of the absorbent body is less than 100 mm in the width direction). In this case, the width direction is the absorber width). The obtained test piece is allowed to stand on a horizontal table with the top sheet side up. Then, an acrylic cylinder having an inner diameter of 50 mm is placed vertically at the center of the test piece, and 50 g of physiological saline is added into the cylinder at one time. The time until the added physiological saline was absorbed by the test piece and disappeared from the top sheet was measured, and the amount of physiological saline absorbed per second from the time when the physiological saline was added to the time when the physiological saline disappeared ( g) to calculate the absorption rate of body fluid (g / sec)
And As a result of measuring a plurality of test pieces having different cut-out positions, the portion where the absorber is disposed has a portion having a body fluid absorption rate of 3.0 g / sec or more.
It means that the absorption rate of bodily fluid in one or more test pieces is 3.0 g / sec or more.

[0011] Saturated absorption of bodily fluid;
A test piece cut out in a width direction of 100 mm is used (when the size of the absorber is less than 100 mm in the width direction, the width direction is the absorber width). The obtained test piece was 150 mm ×
150mm nylon mesh (250 mesh)
Put in a bag and immerse the mesh bag in physiological saline. This was pulled up after 1 minute and drained for 5 minutes. From the weight (g) after draining, the weight (g) before immersion, and the area (cm ² ) of the test piece, absorption of physiological saline per 100 cm ^{2 of} the test piece was performed. (G) to calculate the saturated absorption amount (g / 100c).
m ² ). The part where the absorber is disposed has a saturated absorption amount of the body fluid of 75 g / 100 cm ^2. Having the above portion means that the saturated absorption amount of the bodily fluid in one or more test pieces is 75 g / 100 cm ² or more as a result of measuring a plurality of test pieces having different cutting positions in this way.

The basis weight of the disposable diaper is 50 g / m^Two
It is preferable from the viewpoint of weight reduction and compactness that it is less than
However, urine leakage is likely to occur. Also suck
The part where the collector is arranged has a body fluid absorption rate of 3.0 g.
If there is no part / second or more, a large amount of urine
When discharged, leakage is likely to occur. In addition, the absorber
The placed part has a saturated absorption of body fluid of 75 g / 100
cm ^TwoIf you do not have the part, if you wear for a long time,
Leakage is likely to occur.

In order to obtain a high urine leakage prevention effect both when urine is discharged vigorously and when urine is discharged in large quantities over time, the absorption rate of body fluid is 3.0.
g / sec or more (hereinafter referred to as a high-speed absorption part) and a part having a saturated absorption amount of body fluid of 75 g / 100 cm ² (hereinafter referred to as a high absorption part) are both disposed in the urination part of the wearer. It is preferable to be at the point. Here, the urination point part means a part located in the urination part itself and its periphery when the wearer wears the diaper. still,
The high absorption portion and the high speed absorption portion may be the same portion, different portions, or may partially overlap.

The above-mentioned product basis weight, body fluid absorption rate, and body fluid saturation absorption rate reduce the fluff pulp content in the absorber 4 while maintaining a high absorption rate and a high saturation absorption rate by the polymer. Can be achieved by The absorber can be formed with the water-absorbing polymer and the fiber aggregate, and the mount for packaging these as main components, but in the present embodiment, the absorbent polymer 42 is held in the inter-fiber gap. Nonwoven Fabric 4 as a Fiber Assembly
1 uses an absorber 4 wrapped with a mount 43.

Examples of the water-absorbing polymer include sodium polyacrylate, (acrylic acid-vinyl alcohol) copolymer, crosslinked sodium polyacrylate, (starch-acrylic acid) graft copolymer, and (isobutylene-maleic anhydride). Acid) copolymers and saponified products thereof, polyaspartic acid and the like can be used. In particular, the absorption rate by the DW method is 8 g /
30 seconds / 0.3 g or more of superabsorbent polymer A and 5 g / 3
0 seconds / 0.3 g or less of superabsorbent polymer B, and superabsorbent polymer A / superabsorbent polymer B = 90/10 to 10
/ 90 (weight ratio) is preferable because fluff pulp can be significantly reduced as compared with a normal diaper while maintaining a high absorption rate and a high saturated absorption amount of the disposable diaper. Further, the product basis weight can be easily adjusted to 50 to 220 g / m.
From the viewpoint of ² , the content of fluff pulp in the absorber 4 is preferably 0 to 30% by weight. The fluff pulp content may be 0%.

The absorption rate by the DW method (g / 30 seconds /
0.3g), using an apparatus (Demand Wettability Tester) generally known as an apparatus for performing the DW method,
0.3 g of the superabsorbent polymer to be measured was placed on a polymer spray table (70 mmφ, a table where No. 2 filter paper was placed on a glass filter No. 1) with the liquid level of physiological saline set at an equal water level.
The water absorption at the time of spraying and the superabsorbent polymer was
And the amount of water absorbed after 30 seconds (this amount of absorption is measured on the scale of a burette indicating the amount of decrease in the level of physiological saline)
Is the value of this amount of absorption obtained by measuring

Examples of the fiber aggregate include fluff pulp, rayon fiber, hydrophilic fiber such as cotton and cellulose acetate, polyolefin fiber such as polyethylene and polypropylene, condensed fiber such as polyester and polyamide, and vinyl chloride. And fibers of a vinyl monomer polymer such as vinyl acetate. These can be single or 2
It may be a fiber obtained by laminating seeds or more, or compounding them into a core-sheath. Among these fibers, hydrophobic ones may be used after being made hydrophilic by treatment with an oil agent or the like. Further, in the case of using a fiber having heat fusibility, it is preferable to use the fiber aggregate as a non-woven fabric by heat treatment or the like, since the strength of the absorber is improved. In addition, as the backing paper, those usually used for disposable diapers can be used without any particular limitation. Further, the uneven sheet 44 may not be provided.

In addition, the materials for forming the constituent members of the disposable diaper having the above structure will be described. As the top sheet, the back sheet, the water-repellent nonwoven fabric and the outer layer nonwoven fabric,
What is used for a disposable diaper can be used without particular limitation. As the leg elastic member, the three-dimensional gather elastic member, and the waist elastic member, those usually used for disposable diapers can be used without any particular limitation.
As a material for forming the fastening tape, in addition to a tape material to which an adhesive is applied, a male material tape of a mechanical fastener or the like is used. In addition, when the fastening tape is a tape material to which an adhesive is applied, a tape that has been subjected to a peeling treatment is used, and when the fastening tape is a male material tape, a tape of a normal mechanical fastener is used. A tape material used as a female material is used without any particular limitation.

Since the disposable diaper of the present embodiment is constructed as described above, the disposable diaper is lightweight and compact. Even when a plurality of pieces are stored in a packaging bag in a state of being laminated and compressed to form a package, it is lightweight and portable. Is easy. Moreover, it has a high urine leakage prevention effect, and can effectively prevent urine leakage in both cases where urine is discharged vigorously and urine is discharged in large quantities over time.

In the above-described embodiment, the description has been made by exemplifying the disposable diaper of the baby type. However, the present invention is directed to the disposable diaper of the baby pants type and the expandable and pants type diapers for the adult. It is also applicable to disposable diapers.

[0021]

[Example 1] Absorption rate by DW method 11.8
g / 30 sec / 0.3 g superabsorbent polymer A (manufactured by Sumitomo Seika, trade name "10SH-P") and a superabsorbent polymer B having an absorption rate of 3.6 g / 30 sec / 0.3 g by DW method. (Manufactured by Nippon Shokubai, trade name "CA-W4") and a weight ratio (A /
B) = 50/50 mixing to obtain a superabsorbent polymer mixture. Also, the core / sheath is a composite fiber of PP / PE and P
ET fibers are mixed at a weight ratio of 70/30 to give a basis weight of 3
An air-through nonwoven fabric of 0 g / m ² was formed. The superabsorbent polymer mixture was sprayed onto the nonwoven fabric so as to have a basis weight of 200 g / m ² , and the superabsorbent polymer was supported between the fibers of the nonwoven fabric. Next, the upper and lower surfaces are weighed 15 g /
The absorbent was obtained by wrapping with an m ² tissue. Next, a nonwoven fabric made of PP / PE was provided as a top sheet on one surface of the absorber, and a PE film was provided as a back sheet on the other surface. Furthermore, a known fastening tape, a waist elastic member, a leg elastic member, and the like were disposed to obtain a baby-sized M-size disposable diaper shown in FIG.

Example 2 A superabsorbent polymer mixture obtained in the same manner as in Example 1 was sprayed on the adhesive-coated surface of a tissue coated with a hot-melt adhesive so as to have a basis weight of 200 g / m ^2. Further, a tissue coated with a hot melt adhesive was spread on the spray surface to obtain an absorber. A disposable diaper was obtained in the same manner as in Example 1 except that this absorbent was used.

[Comparative Example 1] Absorption rate by DW method 3.6
g / 30 seconds / 0.3 g superabsorbent polymer (manufactured by Nippon Shokubai Co., Ltd., trade name “CA-W4”) and fluff pulp are mixed at a weight ratio (polymer / pulp) = 40/60, and water-absorbing polymer, fluff pulp each basis weight, in order to fiber stacking the sheet so that the 200 g / m ^2, 300 g / m ^2, then the basis weight 15g the upper and lower surfaces / m
Wrapped with ² tissues to obtain an absorber. A disposable diaper was obtained in the same manner as in Example 1 except that this absorbent was used.

Comparative Example 2 The same superabsorbent polymer and fluff pulp as in Comparative Example 1 were mixed in the same ratio as in Comparative Example 1, and the basis weight of each of the superabsorbent polymer and fluff pulp was 80 g / m 2 in order. ^{2. The} sheet is laid in a sheet form so as to have a weight of 120 g / m ^2, and then the upper and lower surfaces are weighed at 15 g / m ^2.
Wrapped in a tissue to obtain an absorber. A disposable diaper was obtained in the same manner as in Example 1 except that this absorbent was used.

The weight, product basis weight, absorption rate and saturated absorption amount of each disposable diaper of Examples 1 and 2 and Comparative Examples 1 and 2 were measured, and the results are shown in Table 1. In addition, the absorption rate and the saturated absorption amount show that the test piece obtained from the urination point part arranged in the urination part of the wearer showed the highest value in any disposable diaper. 2 shows the absorption rate and the saturated absorption amount of the test piece obtained from Example 1.

Further, each disposable diaper was evaluated for urine leakage. The evaluation was performed by using a total of 200 use tests for each disposable diaper for 10 monitors. And of each of the 200
Table 1 shows the ratio of the disposable diaper that caused urine leakage as “the ratio of urine leakage”. The fluff pulp content (% by weight) of the absorbent in each of the disposable diapers of Examples 1 and 2 and Comparative Examples 1 and 2 was 0%, 0%, 57%, and 5%, respectively.
2%.

[0027]

[Table 1]

The disposable diapers of Examples 1 and 2 have a high urine leakage preventing ability despite their weight being 25 g or less and the weight per piece being significantly lighter than the conventional disposable diapers. Have maintained. The disposable diaper of Comparative Example 1 has a high ability to prevent urine leakage, but is heavy and difficult to carry in a package. The disposable diaper of Comparative Example 2 has the fluff pulp and the superabsorbent polymer of the absorbent member reduced by 60% by weight respectively from those of Comparative Example 1, but has a reduced urine leakage preventing ability although it is lightweight. .

[0029]

The disposable diaper of the present invention is lightweight and compact, is light and easy to carry even when a plurality of wrappers are packaged, and has a high urine leakage prevention effect.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a disposable diaper according to the present invention.

FIG. 2 is a sectional view schematically showing a section taken along line XX of FIG. 1;

FIG. 3 is a cross-sectional view schematically showing a YY cross section of FIG. 1;

FIG. 4 is a sectional view schematically showing a ZZ section of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disposable diaper 11 Fastening tape 2 Top sheet 3 Back sheet 4 Absorber 41 Polymer fixed nonwoven fabric 42 Absorbent polymer 43 Mount 44 Uneven sheet 5 Outer nonwoven fabric 51 Fastening part 6 Solid gather 61 Water repellent nonwoven fabric 62 Free edge 63 Solid gather elasticity Member 7 Leg gather 71 Leg elastic member 8 Waist portion 81 Waist elastic member A Abdominal side B Back side

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kenji Ishiguro 2606 Akabane, Kaiga-cho, Haga-gun, Tochigi Prefecture F-term in the Kao Corporation Research Institute (reference) 3B029 BA04 BA12 BA15 BA18 BB06

Claims (3)

[Claims] 1. A disposable diaper having a liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-retentive absorber interposed between the two sheets, and has a product basis weight of 50 to 220 g / m ^2. Wherein the portion where the absorber is disposed has a portion having a body fluid absorption rate of 3.0 g / sec or more and a saturated absorption amount of the body fluid of 75 g / 100 c
Disposable diapers having m ² or more parts. 2. A urination point provided in a urination part of a wearer, comprising a part having a body fluid absorption rate of 3.0 g / sec or more and a part having a body fluid saturation absorption of 75 g / 100 cm ² or more. The disposable diaper described. 3. The disposable diaper according to claim 1, wherein the content of fluff pulp in the absorbent is 0 to 30% by weight.