JP6086385B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper suitable for use in a low birth weight infant.

  In general, neonates with a birth weight of 2,500 g or less are called low birth weight infants, neonates with a weight of 1,500 g or less are called extremely low birth weight infants, and neonates with a weight of 1,000 g or less are called very low birth weight infants. Due to the short period of time in the hospital, there is no resistance in various aspects and the skin is weak, so the child is raised in an incubator in the neonatal intensive care unit (NICU). Such disposable diapers for low birth weight infants have the same basic structure as ordinary disposable diapers (for example, see Patent Documents 1 and 2), but the weight before use is determined, and the weight of the diaper after use. The amount of urine can be calculated by subtracting the weight of the diaper before use.

  However, in the conventional disposable diaper, the total weight of the diaper before use (hereinafter, also simply referred to as pre-use weight) may increase, resulting in inaccurate urine volume calculation.

JP 2006-136702 A Japanese Patent Laid-Open No. 2005-287871 JP 2009-82484 A JP 2008-73187 A

  Conventionally, such an increase in weight before use has not been regarded as a problem, and in order to solve this, it was necessary to start from investigation of the cause. And, as a result of earnest research by the present inventor, in order to exchange diapers skillfully, several spare diapers are removed from the product packaging and stored in the incubator, and the incubator It was discovered that the weight before pre-use increases due to the absorption of moisture in the incubator and the urine volume calculation becomes inaccurate due to the fact that is maintained at high humidity. That is, the conventional disposable diaper is not supposed to be stored in a high humidity environment in a naked state after being taken out of the product packaging.

  This problem can be solved by not storing bare disposable diapers taken out of product packaging in a high-humidity environment or wrapping them in a moisture-proof material, but this is a special case of childcare in an incubator. These solutions are not desirable in order to perform frequent frequent diaper changes in the environment.

  Then, the main subject of this invention is providing the disposable diaper which can prevent the increase in the weight before use even if it stores in the high humidity environment with the naked state taken out from the product packaging.

  The present invention that has solved the above problems is as follows.

<Invention of Claim 1>
An absorbent body, a liquid-permeable top sheet covering the front side of the absorbent body, and a liquid-impermeable sheet covering the back side of the absorbent body,
Between the top sheet and the absorber, provided with a water-soluble moisture-proof layer covering the entire surface of the absorber,
A disposable diaper characterized by that.

(Function and effect)
By providing such a moisture-proof layer, moisture absorption of the absorber can be suppressed, and an increase in weight before use can be suppressed even when stored in a high-humidity environment in a naked state taken out from the product packaging. . In addition, since the moisture-proof layer is water-soluble, it dissolves upon contact with urine and does not inhibit urine permeation and does not volatilize, so there is no effect on urine volume calculation. The moisture-proof layer means a layer having a moisture permeability of 12000 g / m ² · 24 hr or less measured according to JIS Z 0208-1976 “Moisture permeability test method for moisture-proof packaging materials (cup method)”. It includes not only those that completely block the water but also those that suppress moisture permeation. The term “moisture permeability” means a value measured according to JIS Z 0208-1976 “Moisture permeability test method for moisture-proof packaging material (cup method)”.

<Invention of Claim 2>
The absorbent body are those formed by incorporating superabsorbent polymer particles in the aggregate of pulp fibers, and 80 to 150 g / m ² pulp fibers, and superabsorbent polymer particles 90~160g / m ^2, respectively The disposable diaper according to claim 1, which contains and has a total diaper weight of 4.5 to 70.0 g.

(Function and effect)
Such a diaper is particularly suitable for the present invention because it is particularly affected by weight increase due to moisture absorption.

<Invention of Claim 3>
The disposable diaper according to claim 1 or 2, wherein the absorbent body is wrapped by a packaging sheet, and the moisture-proof layer is provided between the packaging sheet and the absorbent body.

(Function and effect)
If the moisture-proof layer is close to the diaper surface, the diaper surface may become hard to touch. Therefore, it is desirable to provide it near the absorbent body as described above.

<Invention of Claim 4>
The disposable diaper according to claim 1 or 2, wherein the absorbent body is wrapped in a packaging sheet made of water-absorbing paper, and the moisture-proof layer is provided outside the packaging sheet.

(Function and effect)
Water absorbent paper such as crepe paper is widely used as a packaging sheet for wrapping the absorbent body, and such water absorbent paper also has a moisture absorbing effect. Therefore, in such a case, it is desirable to provide a moisture-proof layer on the outside of the packaging sheet to prevent an increase in weight due to moisture absorption of the packaging sheet as well as the absorber.

<Invention of Claim 5>
The entire back surface of the absorber is covered with a moisture-proof layer, the moisture permeability of the moisture-proof layer covering the back surface of the absorber is higher than the moisture permeability of the moisture-proof layer covering the surface of the absorber, and the back surface of the absorber The disposable diaper of any one of Claims 1-4 whose sum of the moisture permeability of the moisture-proof layer which covers and the moisture permeability of the said liquid-impermeable sheet is 12000 g / m < ² > * 24hr or less.

(Function and effect)
From the viewpoint of improving moisture resistance, it is desirable to cover the entire surface and back surface of the absorbent body with a moisture barrier layer in this way.

<Invention of Claim 6>
The moisture-proof layer is provided only on the front side of the absorber, and the moisture permeability of the liquid-impermeable sheet is 12000 g / m ² · 24 hr or less, according to any one of claims 1 to 4. Disposable diapers.

(Function and effect)
From the viewpoint of improving moisture resistance as described above, it is desirable to provide a moisture-proof layer on the back side of the absorbent body, but the back side of the absorbent body is blocked or suppressed by a liquid-impermeable sheet. From the viewpoint of suppressing the increase, it is not necessary to provide a moisture-proof layer on the back side of the absorber.

<Invention of Claim 7>
The disposable diaper according to any one of claims 1 to 6, wherein the moisture-proof layer is formed of a water-soluble substance having a skin care effect.

(Function and effect)
Since the water-soluble moisture-proof layer may ooze out on the surface of the diaper due to so-called reversal and adhere to the skin, it is also preferable to use a water-soluble substance having a skin care effect in this way.

<Invention of Claim 8>
An absorbent body, a liquid-permeable top sheet covering the front side of the absorbent body, and a liquid-impermeable sheet covering the back side of the absorbent body,
Between the top sheet and the absorber, provided with a moisture-proof layer covering the entire surface of the absorber,
This moisture-proof layer is a hot melt adhesive layer formed with a coating pattern in which a large number of urine permeation holes are formed at a coating amount of 1.5 to 25.0 g / m ² .
A disposable diaper characterized by that.

(Function and effect)
It is also a preferable form to provide a moisture-proof layer with a hot-melt adhesive layer capable of transmitting urine as described above. Although this moisture-proof layer cannot block moisture transmission, it can be suppressed. Moreover, in a general disposable diaper, although a hot-melt-adhesive agent may be apply | coated to the part which covers the circumference | surroundings of an absorber, such a large amount of application | coating is not performed. This is because urine penetration is inhibited. However, in a wearer with a small amount of urine, such as a low birth weight infant, as long as urine permeates, a certain degree of permeation does not cause problems such as leakage.

<Invention of Claim 9>
The disposable diaper of any one of Claims 1-8 which is a disposable diaper for low birth weight infants.

(Function and effect)
As described above, an increase in the weight before use due to moisture absorption occurs even in a general disposable diaper, but the effect is significant in a disposable diaper for a low birth weight infant. Therefore, the present invention is particularly suitable for a low birth weight infant.

  As described above, according to the present invention, it is possible to prevent an increase in weight before use even when stored in a high humidity environment in a naked state taken out from the product packaging, and accurately measure urine volume. Etc. are brought about.

It is a principal part fracture | rupture top view which shows the inner surface side of the deployment state of a disposable diaper. It is a top view which shows the outer surface side of the deployment state of a disposable diaper. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a perspective view which shows a mounting state. It is AA sectional drawing of FIG. 1 in another form. It is AA sectional drawing of FIG. 1 in another form.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
<Examples of tape-type disposable diapers for low birth weight infants>
1 to 5 include a dorsal portion B (a portion on the rear side from the center in the front-rear direction) and a ventral side portion F (a portion on the front side from the center in the front-rear direction). A so-called tape-type disposable diaper 1 is shown that is mounted by locking both side portions of the side portion B to the ventral portion F. 3 and FIG. 4 shows a hot melt adhesive, and the coating pattern can be used without particular limitation, such as solid coating, summit coating, spiral coating, bead coating, and the like. However, an intermittent pattern is preferred.

  More specifically, the disposable diaper 1 extends from the lower abdomen to the crotch along the center in the width direction so as to cover the buttocks, and has a liquid-permeable top sheet 2 that forms a body side surface. And a basic structure in which an absorber 4 is interposed between the liquid-impermeable sheet 3 located on the outer surface side. The outer surface of the liquid-impermeable sheet 3 is covered with an exterior sheet 5. This exterior sheet 5 extends outward in the width direction from the liquid-impermeable sheet 3, and the side part of the top sheet 2 that extends outward in the width direction from the liquid-impermeable sheet 3 and a hot melt adhesive. The side flap part SF in which the absorbent body 4 does not exist is formed, and the side part of the side flap part SF is composed only of the exterior sheet 5, and the side edges form both side edges of the diaper. On both side portions of the back portion B, the exterior sheet 5 has a protruding portion formed to protrude outward in the width direction, and a fastening tape 7 connected to the back surface of the protruding portion with respect to the abdominal outer surface. Is attached.

As materials for these parts, known materials can be appropriately used. For example, as the top sheet 2, in addition to various nonwoven fabrics having a fineness of about 1.0 to 4.0 dtex and a basis weight of about 15 to 35 g / m ² , a perforated film having a large number of holes can be used. Such as vitamin E, an antioxidant that suppresses oxidative degradation of the skin, and emollients and moisturizers such as animal and vegetable oils and glycerin fatty acid esters that retain skin stratum corneum and soften the skin. Skin care ingredients can be included. The nonwoven fabric is not particularly limited, such as air through, point bond, spun bond, etc. However, when the skin care component is applied to the top sheet 2 at the raw material stage (raw cotton), a short fiber nonwoven fabric is preferable, and the skin care component is applied on the product production line. If processed, a spunbonded nonwoven fabric with high surface smoothness is preferred. Moreover, although a hydrophobic thing may be used as a nonwoven fabric, the nonwoven fabric which has hydrophilic property, and especially the nonwoven fabric containing a hydrophilic natural fiber is suitable at the point which is kind to skin.

As the liquid-impermeable sheet 3, a non-breathable film or a breathable porous film made of a polyethylene film or the like can be used. As the exterior sheet 5, various nonwoven fabrics having a fineness of about 1.0 to 4.0 dtex and a basis weight of about 10 to 40 g / m ² , particularly laminated nonwoven fabrics such as SMS nonwoven fabric and SMMS nonwoven fabric are preferable from the viewpoint of both strength and flexibility. Can be used.

The type of the nonwoven fabric forming the exterior sheet 5 is not particularly limited, and examples of the material fiber include synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters, and polyamides, recycled fibers such as rayon and cupra, and cotton. Natural fibers such as the above can be used, and as a processing method, a spunlace method, a spunbond method, a thermal bond method, an air-through method, a needle punch method, or the like can be used. However, a long-fiber nonwoven fabric such as a spunbond nonwoven fabric, an SMS nonwoven fabric, or an SMMS nonwoven fabric is preferable in that both the touch and strength can be achieved. In addition to using a single nonwoven fabric, a plurality of nonwoven fabrics can be used. In the latter case, the nonwoven fabrics 12 are preferably bonded to each other with a hot melt adhesive or the like. When using a nonwoven fabric, it is desirable that the fineness is about 1.0 to 4.0 dtex, and the fiber basis weight is 10 to 50 g / m ² , particularly 15 to 30 g / m ² .

As the absorbent body 4, it is possible to use a laminate of pulp fibers, an aggregate of filaments such as cellulose acetate, or a nonwoven fabric, and a mixture obtained by mixing and fixing a superabsorbent polymer as necessary. . The absorber 4 is preferably formed by an airlaid method in order to reduce the thickness. The fiber basis weight in the absorbent body 4 is preferably about 80 to 150 g / m ² , and the polymer basis weight is preferably about 90 to 160 g / m ² . As the superabsorbent polymer used for the absorber 4, an antibacterial polymer is preferable. The absorber 4 can be made into an appropriate planar shape such as a rectangle or an hourglass shape.

  The absorber 4 can be packaged with a liquid-permeable packaging sheet 8 as necessary. As the material for the packaging sheet 8, it is preferable to use a thin paper, particularly a crepe paper, from the viewpoint of being inexpensive and rich in absorbency. However, a nonwoven fabric such as a hydrophilic SMMS (spunbond / meltblown / meltblown / spunbond) nonwoven fabric is particularly suitable. The material can be polypropylene, polyethylene / polypropylene, or the like. The packaging sheet 8 can wrap the absorbent body 4 in an appropriate packaging form. However, as shown in the drawing, one sheet of the packaging sheet 8 that is longer in the front-rear direction than the absorbent body 4 is inserted from the front side in the width direction to one side. It returns to the front side of the absorbent body 4 through the side part, the back side, and the other side part, and the both side parts are overlapped at the middle part in the width direction of the front side, and the front and rear end parts of the packaging sheet 8 are the absorbent body 4 on both front and rear sides of the absorbent body 4. It is also possible to adopt a configuration in which the front and back are reversed, that is, a portion in which the overlapping portion in the intermediate portion in the width direction of the absorber 4 is located on the back side of the absorber 4. Moreover, although not shown in figure, the part which covers the upper surface and side surface of the absorber 4 and the part which covers a lower surface are comprised with the separate packaging sheet 4, or the part which covers the upper surface of the absorber 4, and the part which covers a side surface and a lower surface are comprised. In this case, each part of the packaging sheet can be composed of different materials.

  The fastening tape 7 has an end of a sheet base material made of a nonwoven fabric, a plastic film or the like attached to the diaper as a tape attaching portion 7C, and the tape main body portion 7B, which is a tip side portion protruding from the diaper side edge, has an abdominal side. A hook material of a mechanical fastener is provided as the locking portion 7A. The tape attachment portion 7C is bonded to the back surface of the projecting portion of the exterior sheet 5 with a hot melt adhesive, and the hook material is bonded to the sheet base material with the hot melt adhesive. The hook material has a large number of engaging projections on the outer surface side thereof. The shape of the engaging protrusion is (A) Le-shaped, (B) J-shaped, (C) Mushroom-shaped, (D) T-shaped, (E) Double J-shaped (J-shaped And the like may be any shape. As the locking portion 7A, an adhesive material layer can be provided as the locking portion 7A of the fastening tape 7 instead of the hook material.

  In the illustrated embodiment, since the exterior sheet 5 forming the outer surface of the ventral portion F is made of a nonwoven fabric, by reducing the flexibility of the diaper, the hook material is directly locked to the fibers of the nonwoven fabric. However, it is also possible to provide a target sheet for facilitating the locking at the fastening portion of the fastening tape 7 in the ventral portion F. As the target sheet, when the locking portion 7A is a hook material, it is possible to use one in which a large number of loop yarns on the surface of a sheet base material made of a plastic film or a non-woven fabric are entangled with an engagement protrusion of the hook material. Further, when the locking portion 7A is an adhesive material layer, it is possible to use a surface of a sheet base material made of a plastic film having a smooth surface that is rich in adhesiveness and subjected to a peeling treatment.

  Further, in the illustrated embodiment, the elastic elastic members 6 are fixed between the top sheet 2 and the liquid-impermeable sheet 3 in the side flap portion SF in a state of extending in the front-rear direction (vertical direction). The elastic elastic member 6 is preferably an elongated member such as rubber thread as in the illustrated example, but a sheet-like or net-like member can be used. The thread rubber can be used regardless of whether it is a synthetic rubber or a natural rubber, and the thickness is preferably 470 dtex or more (in the case of a synthetic rubber, the natural rubber is preferably the same level), and the length of the rubber thread is along the front-rear direction. It is preferably fixed in a stretched state of 120 to 250%. When such an elastic elastic member 6 is provided, the side flap portion SF of the diaper contracts to fit around the leg. Note that the elastic elastic member 6 may be omitted because the elastic elastic member 6 may cause excessive skin irritation for low birth weight infants with weak skin. The expansion rate in this case means a value when the natural length is 100%.

  Characteristically, a water-soluble moisture-proof layer 9 that covers the entire surface of the absorber 4 is provided between the top sheet 2 and the absorber 4. By providing such a moisture-proof layer 9, moisture absorption of the absorber 4 can be suppressed, and an increase in weight before use can be suppressed. In addition, since the moisture-proof layer 9 is water-soluble, it dissolves upon contact with urine and does not inhibit urine permeation and does not volatilize, so there is no influence on urine volume calculation.

In particular, the absorbent body 4 is 80 to 150 g / m ² pulp fibers, and superabsorbent polymer particles containing respectively 90~160g / m ^2, when the total weight of the diaper 4.5～70.0G, due to moisture absorption Since the influence of weight increase is large, it is desirable to provide the moisture-proof layer 9.

The moisture-proof layer 9 is completely moisture-permeable if it is a layer having a moisture permeability measured in accordance with JIS Z 0208-1976 “Moisture permeability test method for moisture-proof packaging materials (cup method)” of 12000 g / m ² · 24 hr or less. not only to cut off, may be one to some extent inhibit moisture permeation, but are not limited to, moisture permeability is more preferably the following 6000g / m ² · 24hr, or less 4000g / m ² · 24hr And particularly preferred.

  As an example of the water-soluble moisture-proof layer 9, a water-soluble paint film or the like can be used in addition to a water-soluble film made of wafer or polyvinyl alcohol. As can be seen from the example of the water-soluble paint, the water-soluble moisture-proof layer 9 may be formed by applying a film-forming liquid to the internal material, in addition to interposing a previously formed film-like material inside. . In addition, since the water-soluble moisture-proof layer 9 may ooze out on the surface of the diaper due to so-called reversal and adhere to the skin, it is preferably formed of a water-soluble substance having a skin care effect, such as gelatin.

The range in which the moisture-proof layer 9 is provided can be determined as appropriate. For example, from the viewpoint of improving moisture resistance, a form in which the entire surface and the entire back surface of the absorber 4 are covered with a moisture-proof layer 9 is preferable, as shown in FIGS. 4 and 6A and 6C. As shown to 6 (a) (c), the form in which the whole outer surface of the absorber 4 is covered with the moisture-proof layer 9 (enclosed and sealed) is preferable. In this case, the coating form by the moisture-proof layer 9 can be the same as that of the packaging sheet 8. That is, as shown in FIG. 6A, one moisture-proof layer 9 that is longer in the front-rear direction than the absorbent body 4 extends from the front side in the width direction to one side, the back side, and the other side. Then, it returns to the front side of the absorbent body 4 and both sides overlap at the intermediate portion in the width direction on the front side, and the front and rear ends of the moisture-proof layer 9 overlap on the front and rear sides of the absorbent body 4 without the absorbent body 4 interposed therebetween. The reverse configuration, that is, the configuration in which the overlapping portion at the intermediate portion in the width direction of the absorber 4 is located on the back side of the absorber 4 can also be adopted. Moreover, as shown to Fig.6 (a), the part which covers the upper surface of the absorber 4 and the part which covers a lower surface are comprised by the separate moisture-proof layer 9, etc., and it can also cover with several moisture-proof layers 9, In some cases, the moisture-proof layer 9 of each part can be made of different materials. In this case, the moisture permeability of the moisture-proof layer 9 covering the back surface of the absorber 4 may be the same as that of the moisture-proof layer 9 covering the surface of the absorber 4, but the back side of the absorber 4 is permeable by the liquid-impermeable sheet 3. Since the moisture is blocked or suppressed, the moisture permeability of the moisture-proof layer 9 that covers the back surface of the absorber 4 is made higher than the moisture permeability of the moisture-proof layer 9 that covers the surface of the absorber 4 and covers the back surface of the absorber 4. The sum of the moisture permeability of the moisture-proof layer 9 and the moisture permeability of the liquid-impermeable sheet 3 may be 12000 g / m ² · 24 hr or less. The sum of the moisture permeability of the moisture permeability and the liquid-impermeable sheet 3 of the moisture-proof layer 9 covering the rear surface of the absorbent body 4 is preferably not more than 9000g / m ² · 24hr, more preferably not more than 6000g / m ² · 24hr, 2500g / M ² · 24 hr to 4000 g / m ² · 24 hr or less is particularly preferable.

Moreover, since moisture permeability is blocked or suppressed by the liquid-impermeable sheet 3 on the back side of the absorbent body 4, from the viewpoint of suppressing an increase in cost, as shown in FIG. It is also a preferable form that the moisture-proof layer 9 is not provided, but is provided only on the front side (the illustrated example covers the entire surface). In this case, the moisture permeability of the liquid-impermeable sheet 3 may be any 12000g / m ² · 24hr or less, but is preferably from 9000g / m ² · 24hr, more preferably not more than ^{6000g / m 2 · 24hr, 2500g} / It is particularly preferably m ² · 24 hr or more and 4000 g / m ² · 24 hr or less.

  The portion where the moisture-proof layer 9 is interposed can be determined as appropriate, but if the moisture-proof layer 9 is close to the diaper surface, the diaper surface may become hard to touch, so that it is close to the absorber 4, specifically, FIG. 4 and FIG. It is preferable to provide between the packaging sheet 8 and the absorber 4 as shown in (b). The form shown in FIG.4 and FIG.6 (b) is a packaging sheet other than forming by sticking a water-soluble film on the surface of the absorber 4, the back surface, or the inner surface of the packaging sheet 8, or forming a water-soluble coating film. 8 and the absorbent body 4 can be formed by sandwiching a water-soluble film.

  In addition, water absorbent paper such as crepe paper is widely used as the packaging sheet 8 that wraps the absorbent body 4, but such water absorbent paper also has a moisture absorbing effect. Therefore, in such a case, as shown in FIGS. 6A and 6C, a moisture-proof layer 9 is provided on the outside of the packaging sheet 8 to prevent an increase in weight due to moisture absorption of the packaging sheet 8 as well as the absorbent body 4. It is also desirable. 6 (a) and 6 (c), a water-soluble film is attached to the outer surface of the packaging sheet 8, the back surface of the top sheet 2, or the surface of the liquid-impermeable sheet 3, or a water-soluble coating film is formed. In addition, the water-soluble film may be sandwiched between the packaging sheet 8 and the top sheet 2 or between the packaging sheet 8 and the liquid-impermeable sheet 3.

On the other hand, in the above example, the water-soluble moisture-proof layer 9 is provided. However, as shown in FIG. 7, it is also preferable to provide the moisture-proof layer 9 with a hot melt adhesive layer capable of transmitting urine. The moisture-proof layer 9 made of this hot melt adhesive has a coating pattern of 1.5 to 25.0 g / m ² , more preferably 5 to 10 g / m ² and many urine permeation holes are formed. It is formed and does not block moisture permeation but suppresses it to the above-mentioned range of moisture permeation.

  If the application amount of the hot melt adhesive is too large, the permeability of urine is lowered, and if it is too small, moisture permeability cannot be suppressed. Therefore, it is important to be within the above range. The application pattern is not particularly limited as long as a urine permeation hole is formed, and even if the hot melt adhesive is applied in a film form by a contact type application device, or the hot melt adhesive is sprayed by air. You may apply | coat with a type | formula coating device. The hot-melt adhesive contact-type coating apparatus is a device for bringing a jetting machine into contact with an application target when applying a hot-melt adhesive, and examples thereof include a slot coater and a roll coater. On the other hand, the non-contact type coating apparatus is a device that spreads the hot melt adhesive by air without applying the blower to the application target when applying the hot melt adhesive, and can be spirally applied. Examples thereof include a coating device, an omega coating device and a control seam coating device that can be applied in a wavy shape, a curtain coating device that can be applied in a planar shape, and a dot coating device that can be applied in a spot shape.

  As described above, in a general disposable diaper 1, a hot melt adhesive is sometimes applied to a portion covering the periphery of the absorber 4, but such a large amount of application is not performed. This is because urine penetration is inhibited. However, in a wearer with a small amount of urine such as a low birth weight infant, as long as urine permeates, a certain degree of permeation inhibition does not cause problems such as leakage, so that it can be applied in large quantities as described above.

  In addition, since the cover range and intervening part of the moisture-proof layer 9 are the same as in the case of the water-soluble layer described above, the description thereof is omitted.

Basic structure (top sheet 2, liquid-impermeable sheet 3, absorbent body 4 (mixed fiber of pulp and polymer), exterior sheet 5, elastic elastic member 6, fastening tape 7, locking portion 7A similar to the embodiment , Various kinds of disposable diapers 1 for low birth weight infants with a tape body portion 7B, a tape attachment portion 7C, a wrapping sheet 8 (with crepe paper 20 g / m ² ) and a moisture-proof layer 9, and various comparative examples. The sample was folded in two and held at the same temperature: 38 ° C. and the same humidity: 90% RH as the NICU incubator, and the change with time of the product weight was measured.

  The details of the disposable diaper used are shown in Table 1. In Examples 1 to 3, C-200 (thickness: 30 μm) of Hycelon (registered trademark), which is a water-soluble polyvinyl alcohol film manufactured by Nippon Synthetic Chemical Co., Ltd., was used as the moisture-proof layer 9. Moreover, in Example 1, the moisture-proof structure was formed by winding the moisture-proof layer around the outer side of the packaging sheet without a gap as shown in FIG. In Example 2, the moisture-proof structure was formed by winding the moisture-proof layer between the packaging sheet and the absorbent body without any gaps (the moisture-proof layer having the form shown in FIG. 4 was changed to a wound form). In Example 3, a moisture-proof structure was formed by interposing one moisture-proof layer on the front side of the absorbent body and two sheets on the back side between the packaging sheet and the absorbent body (the lower side of the form shown in FIG. 4). Form with two moisture barrier layers).

On the other hand, in Example 4, a moisture-proof structure was formed by applying a hot melt adhesive with a coating width of 5 mm and an interval of 5 mm over both the front and back surfaces of the absorber. The moisture permeability of the moisture-proof layer in Example 4 was measured by bonding two sheets of crepe paper (20 g / m ² per sheet) with a hot melt adhesive having the same pattern and coating amount as the sample of Example 4. And the blank of only two crepe papers (no hot melt adhesive) were measured for moisture permeability, and the latter moisture permeability (5100 g / m ² · 24 h) to the former moisture permeability (2600 g / m ² · 24 h) ) Was subtracted.

  On the other hand, Comparative Example 1 has the same structure as Example 1 except that it does not have a moisture-proof layer.

  The measurement results are shown in Table 1. The amount of increase in product weight with no problem in vital management at NICU was 1 g or less, and Examples 1 to 4 were within this range, but Comparative Example 1 exceeded 1 g after 3 hours. Further, among Examples 1 to 4, Example 1 in which the crepe paper was surrounded by the moisture-proof layer had the smallest increase in product weight, although the amount of the moisture-proof layer was increased.

  The present invention is suitable for low birth weight infants, but can be used for ordinary disposable diapers.

  DESCRIPTION OF SYMBOLS 1 ... Disposable diaper, 2 ... Top sheet, 3 ... Liquid impervious sheet, 4 ... Absorber, 5 ... Exterior sheet, 6 ... Elastic elastic member, 7 ... Fastening tape, 7A ... Locking part, 7B ... Tape main-body part , 7C: Tape attachment portion, 8: Packaging sheet, 9: Moisture-proof layer, F: Ventral side portion, B ... Back side portion, SF ... Side flap portion.

Claims (9)

An absorbent body, a liquid-permeable top sheet covering the front side of the absorbent body, and a liquid-impermeable sheet covering the back side of the absorbent body,
Between the top sheet and the absorber, provided with a water-soluble moisture-proof layer covering the entire surface of the absorber,
A disposable diaper characterized by that. The absorbent body are those formed by incorporating superabsorbent polymer particles in the aggregate of pulp fibers, and 80 to 150 g / m ² pulp fibers, and superabsorbent polymer particles 90~160g / m ^2, respectively The disposable diaper according to claim 1, which contains and has a total diaper weight of 4.5 to 70.0 g.   The disposable diaper according to claim 1 or 2, wherein the absorbent body is wrapped by a packaging sheet, and the moisture-proof layer is provided between the packaging sheet and the absorbent body.   The disposable diaper according to claim 1 or 2, wherein the absorbent body is wrapped in a packaging sheet made of water-absorbing paper, and the moisture-proof layer is provided outside the packaging sheet. The entire back surface of the absorber is covered with a moisture-proof layer, the moisture permeability of the moisture-proof layer covering the back surface of the absorber is higher than the moisture permeability of the moisture-proof layer covering the surface of the absorber, and the back surface of the absorber The disposable diaper of any one of Claims 1-4 whose sum of the moisture permeability of the moisture-proof layer which covers and the moisture permeability of the said liquid-impermeable sheet is 12000 g / m < ² > * 24hr or less. The moisture-proof layer is provided only on the front side of the absorber, and the moisture permeability of the liquid-impermeable sheet is 12000 g / m ² · 24 hr or less, according to any one of claims 1 to 4. Disposable diapers.   The disposable diaper according to any one of claims 1 to 6, wherein the moisture-proof layer is formed of a water-soluble substance having a skin care effect. An absorbent body, a liquid-permeable top sheet covering the front side of the absorbent body, and a liquid-impermeable sheet covering the back side of the absorbent body,
Between the top sheet and the absorber, provided with a moisture-proof layer covering the entire surface of the absorber,
This moisture-proof layer is a hot melt adhesive layer formed with a coating pattern in which a large number of urine permeation holes are formed at a coating amount of 1.5 to 25.0 g / m ² .
A disposable diaper characterized by that.   The disposable diaper of any one of Claims 1-8 which is a disposable diaper for low birth weight infants.

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