JPS62223303A - Disposable diaper - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disposable diaper used for absorbing and absorbing bodily excreta, and particularly to a disposable diaper that covers a wide area of the wearer's body and is suitable for use in diapers. This invention relates to a disposable diaper that can effectively cover the outer part of the diaper. As long as it is included in the concept of this type of diaper, it can be suitably used regardless of whether it is used by infants, the elderly, the sick, or incontinent people.

[Conventional technology]

Conventionally, in disposable diapers, side flaps are formed on both sides in the lateral direction and have a higher degree of flexibility than the semi-rigid absorbent core located in the center between them, and the outer edges of the side flaps are designed to wrap around the wearer's legs. It is known to have an elastic band for sealing, and to form pockets on both sides in the lateral direction by folding the side flaps inward and fixing both longitudinal ends of the folded portions. In addition, the so-called turn-up method involves folding the side flaps inward, fixing the center part of the inner edge of the folded part, and, when in use, expanding the folded part in the anterodorsal region using the fixed part as a reference point. It is also known that

Furthermore, in addition to the above configuration, waist flaps having a high degree of flexibility are formed from both longitudinal ends of the core,
Diaper diapers equipped with an elastic band for sealing around the wearer's waist, and furthermore, diapers equipped with a ventilation structure between the band and the top sheet and back sheet of the diaper, are known.

As the elastic band, thread-like or tape-like rubber, tape-like plastic foam, plastic that shows elasticity when heat treated, etc. are used.

[Problem that the invention seeks to solve]

Generally, diapers belonging to any of the above-mentioned known forms have a tendency that the outer edges of the side flaps in the crotch region are pulled toward the wearer's thighs by the contraction of the elastic band provided thereon. When the diaper is pulled in this way, the front center portion of the diaper protrudes relatively largely to the front. This not only significantly impairs the appearance and feeling of wearing, but also interferes with the wearer's ability to walk and wear underwear. This means that the area covered by the diaper or the volume formed by the inner surface of the diaper becomes smaller, and the outer edges of the side flaps in the crotch area come into contact with excrement most often and in large quantities. do.

Therefore, it will be understood that stray excrement often leaks from the crotch area.

In particular, when it comes to diapers that have pockets formed on both sides in the lateral direction, the diaper takes on the shape described above when worn, so the effect of providing the pockets is halved, and in some cases, the openings of the pockets are closed. It may not have any effect at all. The reason why the opening of the pocket is closed in this way is that in addition to the above-mentioned configuration, the outer surface of the inner edge of the pocket comes into contact with the wearer's skin due to the structure in which the side flaps are folded back inside. caused by.

On the other hand, in a diaper with an elastic band on the waist flap, the waist flap on the back side adheres relatively well to the wearer's body due to the contraction of the band.
The front waist flap is free from the wearer's body,
As a result, not only does it look very uncomfortable to wear, but clothing, especially underwear, may get caught between the front waist flap and the body and become wet with excrement. These disadvantages are caused by the positional relationship between the elastic band of the waist flap, especially the front one, and the tape fasteners provided on both sides of the back in the lateral direction, and by the way the diaper is worn by the mother or the like. That is, in general, in disposable diapers, the tape fastener is located inside the elastic band of the waist flap, so the tension axis of the former is misaligned with the elastic axis of the latter, and as a result, the elastic band is affected by its contractile force. The waist flap is not fully extended to press against the body. Also, mothers often secure the free end of the tape fastener to the front side of the diaper downward and diagonally, so that the elastic band does not function as well as described above.

On the other hand, in order to provide a ventilation structure in the waist flap, an elastic band provided on the flap is interposed between the top sheet and the back sheet, and these are intermittently joined to allow direct passage between the inside and outside of the diaper. forming a channel. However, in order to achieve the desired ventilation effect, the channel needs to be made larger, but this is not preferable because it increases the risk of leakage of excrement, especially urine.

[Means for solving problems]

(Objective) The first aspect of the present invention is to solve the above-mentioned drawbacks of disposable diapers having elastic bands on the side flaps in the crotch region.

The second aspect of the present invention is to simultaneously solve the disadvantages of the diaper described above and the above-mentioned disadvantages of the disposable diaper having an elastic band on the waist flap.

For these and other purposes.

This will be understood from the following description.

(Structure) The gist of the first invention is a water-permeable top sheet, a water-impermeable back sheet, a semi-rigid absorbent core fixed between the two sheets, and a transverse direction of the core. The diaper includes side flaps extending outward from both side edges and having high flexibility, elastic bands forming telescopic gears in the longitudinal direction of the side flaps, and tape fasteners attached to both transverse sides of the back region of the diaper. The present invention relates to a disposable diaper characterized by the following features.

That is, the side flap includes a lower part and an upper part that overlaps with the lower part; the side flap has a first flap part formed by joining the overlapping outer parts of the upper and lower parts to each other. the unjoined inner portion of the upper portion of the side flap is folded back to the outside;
The folded portion has a second flap portion formed in the crotch region between the front region and the back region of the diaper by being joined and fixed in the front region and the back region of the diaper; The diaper is positioned at the free end of the flap portion of No. 2.

The gist of the second invention resides in a disposable diaper characterized by the following features in addition to the gist of the first invention. That is, the disposable diaper includes a highly flexible waist flap extending outward from both longitudinal ends of the core, and a second elastic band forming an elastic gear in the lateral direction of the flap; The flap is formed by each portion of the top sheet and the back sheet extending outward from both longitudinal ends of the core; the second elastic band is interposed between the top sheet and the back sheet. The said diaper which is covered.

(Embodiment) The first embodiment of the present invention will be described as follows.

As shown in FIGS. 1 to 5, the diaper includes a water permeable top sheet 11, a water impermeable back sheet 12, a semi-rigid absorbent core 13, and side flaps 14. The side flap 14 consists of a lower part 15 and an upper part 16. The lower portions 15 are portions of the top sheet 11 and the back sheet 12 that extend outward from both lateral edges of the core 13. The upper part 16 overlaps the upper surface of the lower part 15, and these overlapping outer parts are joined together. In the following description, this joined outer part will be referred to as the first flap part 17. The unjoined inner part of the upper part 16 is folded back to the outside, and this folded part 18 is joined and fixed at the front region 19 and the back region 20. In the following description, the anterodorsal region 19. ．． Inseam area between 20 and 21
The folded portion located at is referred to as a second flap portion 22. An elastic band 23 is attached to the free end of the second flap section 22 with a hot-melt adhesive (not shown) that has elasticity under extension in the longitudinal direction. It is covered in a bag shape at the edge 24. A recessed notch 25 is formed on the outside of the first flap portion 17.

In such a diaper, for example, as shown in FIGS. 6 to 8, a core 13 is positioned between a rectangular top sheet 11 and a back sheet 12, and elastic bands 23 are placed in advance on both sides of the top sheet 11 in the lateral direction. The thin rectangular flap sheets 16 to which the sheets 11. 12. 16 is removed and then the inner portion of the sheet 16 is folded back, as described above, and this folded portion 18 is coated with hot melt adhesive (not shown) or It is obtained by joining and fixing using welding means. As shown in Figures 2 and 8.

The folded portion 18 is wide in the dorsal region 20 and narrow in the front region 19.

As a result, the back region 20, where the wearer's buttocks are located and receives much excrement, is made wider than the front region 19.

A tape fastener 28 coated with a pressure-sensitive adhesive is attached to the side flap 14 in the dorsal region 20,
When using diapers for M, as shown in Figure 1.

It is assembled by gluing the free end of the fastener to the front surface.

The top sheet 11 is made of a fibrous non-woven fabric, a porous plastic film, etc., and the back sheet 12 is made of a plastic film, a laminate sheet of the film and a fibrous non-woven fabric, or the like. In the case of the laminate sheet, the nonwoven fabric is used on the outer surface. Further, the plastic film used as the backsheet 12 is preferably breathable and waterproof, but may be non-breathable if a means for ventilating the inside and outside of the diaper is provided. The core 13 is a mat-like body in which particles of a superabsorbent polymer are mixed with flap pulp or not, and at least the upper and lower surfaces thereof are covered with a water-permeable sheet such as tissue paper or a hydrophobic net. , is semi-rigid because it is made from such material and has a shape.

Naturally, the core 13 is relatively immovably bonded to the top sheet 11 and the back sheet 12 using, for example, a hot melt adhesive (not shown). elastic band 23
Thread-like or tape-like rubber, tape-like plastic foam, plastic film that shows elasticity when heat treated, etc. are used. These diaper materials are those that have been commonly used in disposable diapers, and therefore it will be extremely easy for those skilled in the art to appropriately select them as necessary.

In the embodiment, as shown in FIGS. 7 and 8, the ears 29 in the front region of the diaper and the ears 30 in the back region are different in protruding size, and the core 13 is in the rear region. Although the ears 31 are formed only in this case, the present invention is not limited to this form.

The lower portion 15 of the side flap 14 is formed by portions of the top sheet 11 and the back sheet 12 that extend outward from both lateral edges of the core 13. The upper portion 16 of the side flap is formed of a breathable waterproof sheet, and the material thereof is preferably a fibrous nonwoven fabric treated with water repellent treatment, for example, with silicone resin. In the present invention, a wide top sheet 11 and a back sheet 12 may be used to form the side flaps 14, and the outer portions thereof may be folded back, and this embodiment is also within the scope of the present invention. Of course. However, if separate sheets 16 made of different materials are used for the top sheet 11 and back sheets 1-12 as in the embodiment, the top sheet 1
1 and the side flap 14 at the extension part of the back sheet 12.
There are advantages that cannot be obtained when forming a

For example, even when a breathable material is used as the backsheet 12, the side flaps 14 can be formed of a material with higher breathability to reduce stuffiness inside the diaper. Furthermore, even if the highly breathable material is relatively expensive, the side flaps 14, especially the upper portion 16, need only have a narrower radius than the back sheet 12, so it is not economically disadvantageous. .

In the diaper configured as described above, as shown in FIGS. 2 and 4, pockets 32 are formed by the second flap portions 22 on both sides of the crotch region 21 in the lateral direction, and the elastic band When 23 is retracted, the second flap portion 22 stands up. However, as shown in FIG. 8, since the diaper is stretched in the longitudinal direction, if the elastic band 23 is sufficiently stretched, the second flap portion 22 will be stretched along the fold line of the folded portion 18. and lie down outward. Therefore, also when the elastic band 23 is stretched to such an extent that the second flap portion 22 is tilted outward at an angle without completely lying down. The reason why the second flap portion 22 stands up and falls down/inclines like this is because the second flap portion 22
outward folding portion 1 that is continuous with the flap portion 22 of
8 is fixed in the front region 19 and the dorsal region 20, and the second flap portion 2 is not fixed.
This is because the elastic band 23 is attached to the free end of 2 under a predetermined extension. Further, as shown in FIG. 1, when the diaper is assembled, that is, when the diaper is worn, the first flap portion 17 extends further outward than the second flap portion 22, so that the gears are The second flap part 22 produced will be hidden by the first flap m9x''t.

Next, the second embodiment of the present invention will be described as follows. However, since the second invention adds a waist structure to the first invention,
I will only discuss its waist structure.

As shown in FIG. 2, FIG. 3, FIG. 5, FIG. 8, and FIG. 33 is formed. Between the waist flaps 33,
That is, a second elastic band 34 is attached between the top sheet 11 and the back sheet 12 while being stretched in the length direction thereof. The elastic band 34 is preferably made of a plastic foam, in particular a polyurethane foam, with a thickness of 1 to 3 m, a width of at least 5 mm, a cell count of 20 to 70 kg/rri' and open cells. In addition, elastic band 34
As shown in FIG. 7, for example, a bot-melt adhesive 35,
It is joined at 36. The adhesives 35 and 36 extend linearly in the width direction of the elastic band 34, that is, in the longitudinal direction of the diaper, and are applied at predetermined intervals in the length direction of the band, that is, in the width direction of the diaper. Adhesive 3 for joining the top sheet 11 and elastic band 34
5 is the distance between the back sheet 12 and the elastic band 3.
The gap is narrower than the gap between the adhesive 36 that joins the two. As a result, the contraction force at the joint surface between the top sheet 11 and the elastic band 34 becomes stronger than the contraction force at the joint surface between the back sheet 12 and the elastic band 34. As a result, the waist flap 33 curves toward the wearer's body, making it easier to fit in close contact with the wearer's body. The application state of the adhesive for giving a difference in the shrinkage force is, for example, that the adhesive is applied between the top sheet 11 and the elastic band 34 in a stripe shape extending in the length direction of the band, and
The material may be applied in a wide area between the back sheet 12 and the elastic band 34, and the application state is not particularly limited as long as it can provide a difference in the shrinkage force. Also,
The outer edge of the elastic band 34 is connected to the top sheet 1
1 and the outer edge of the back sheet 12. Hidden there is an elastic band 3 made of plastic foam with open cells.
This is because the inside and outside of the diaper are ventilated through the hole 4. For this purpose, the plastic foam needs to have the above thickness and the above cell number. Furthermore, the distance between the longitudinal outer edge of the core 13 and the opposing inner edge of the elastic band 34 is preferably at least 51 mm. With such a distance, the waist flap 33 will have better adhesion to the wearer's body, especially the abdomen.

(Effects) According to the diaper according to the first aspect of the present invention, as described above, when the elastic band attached to the free end of the second flap part is contracted under a predetermined stretch, If the elastic band is stretched, it will tilt outward or lie down depending on the degree of stretch, so that when the diaper is worn, the second flap portion will touch the wearer's thigh. It is difficult to be drawn to the base. Therefore, the front center portion of the diaper does not protrude relatively far to the front, thereby preventing the wearer from interfering with walking or wearing underwear. In particular, the area covered by the diaper or the volume formed by the inner surface of the diaper is less likely to shrink, and the volume formed by the second flap portion is less likely to decrease.
The opening of the wearer is rarely closed, so it receives excrement over a relatively wide area and effectively seals around the wearer's legs, thereby preventing leakage of excrement from around the legs. be able to.

Further, when the diaper is worn, the first flap portion maintains an outwardly extending state, and the second flap portion, in which the gears are made of the elastic band, is hidden by the first flap portion. Therefore, it looks as if what you are wearing is not a diaper, or as if you are wearing shorts over a diaper, and the appearance is very good. This can be further improved by adding a fabric-like pattern to the backsheet of the diaper. Further, although the first flap part is not attached with an elastic band, the second flap part extends outward and contacts the leg area to maintain a certain sealing state. Even if a small amount of excrement leaks due to insufficient sealing by the second flap part, clothes are unlikely to get wet.

Next, according to the diaper according to the second aspect of the present invention, the elastic band attached between the waist flaps has a contractile force at the joint surface with the top sheet that is greater than a contractile force at the joint surface with the back sheet. Since the waist flap is also made strong, the waist flap, especially the front one, always has a tendency to curve towards the wearer's abdomen. Therefore, even if the elastic band's elastic band and the tape fastener's tension axis are misaligned, or the mother or the like does not properly secure the free end of the tape fastener to the front side of the diaper, the waist flap The flap fits tightly against the abdomen, and the clothing is not caught between the waist flap and the abdomen and does not get wet.

Further, the elastic band of the waist flap is made of plastic foam, and the outer edge of the elastic band is exposed between the outer edges of the top sheet and back sheet forming the waist flap, so that the elastic band is made of plastic foam. Ventilation is performed through the elastic band, so that stuffiness inside the diaper can be reduced or suppressed. In this way, ventilation is achieved by utilizing the characteristics of the material of the elastic band itself, so the adhesive mode for joining the elastic band between the top sheet and the back sheet is such that the elastic band, the top sheet, and the back sheet are bonded together. You can choose freely, taking into consideration the prevention of excrement leakage between the

[Brief explanation of drawings]

The drawings show embodiments of the diaper according to the present invention,
Figure 1 is an assembled perspective view, Figure 2 is an exploded perspective view, Figure 3 is a sectional view taken along line 3-3 in Figure 2, Figure 4 is a sectional view taken along line 4-4 in Figure 2, and Figure 5 is a sectional view taken along line 4-4 in Figure 2. 5-5g cross-sectional view in Figure 2, Figures 6 and 7 are plan views of the forming process, Figure 8 is a developed plan view extending in the vertical direction, and Figure 9 is a cross-sectional view taken along line 9-9 in Figure 8. It is a diagram. 11...Top sheet, 12...Back sheet, 1
3...Core. 14...Side flap, 15...Lower part, 1
6... Upper part, 17... First flap part, 1
8... Folded portion, 19... Front area, 20...
- Dorsal area, 21... Inseam area. 22... Second flap portion, 23... Elastic band, 25... Concave notch, 28... Tape fastener, 32... Pocket, 33... Waist fluff degree, 34... Elastic band, 35.36・
・・Adhesive---: Figure 4 Figure 8 Figure 9

Claims (17)

[Claims] (1) A water-permeable top sheet, a water-impermeable back sheet, a semi-rigid absorbent core fixed between the two sheets, and highly flexible sides extending outward from both lateral edges of the core. A disposable diaper comprising a flap, an elastic band forming elastic gathers in the longitudinal direction of the side flaps, and tape fasteners attached to both sides of the back region of the diaper in the lateral direction, and characterized by the following features. a. The side flap consists of a lower part and an upper part overlapping the lower part. b. The side flap has a first flap portion formed by joining overlapping outer portions of the upper and lower side portions to each other. c. In the side flap, the unjoined inner part of the upper part is folded back to the outside, and this folded part is joined and fixed in the front region and the back region of the diaper, so that It has a second flap portion formed in the crotch region between the two regions. d. said elastic band is positioned at the free end of said second flap section; (2) The diaper according to claim 1, wherein the upper portion of the side flap is formed of a breathable and waterproof sheet made of a different material from the lower portion. (3) The diaper according to claim 1, wherein the breathable and waterproof sheet is a fibrous nonwoven fabric treated to be water repellent. (4) The diaper according to claim 1, wherein the lower portion of the side flap is formed by a portion of the top sheet and the back sheet that extend outward from the outer edge of the core. (5) The diaper according to claim 1, wherein the outward folding width of the folded portion of the side flap is larger in the back region of the diaper than in the front region. (6) The diaper according to claim 1, wherein the outside of the first flap portion in the crotch region of the diaper is notched. (7) The diaper according to claim 1, wherein the elastic band is housed in a bag portion formed at a free end of the second flap portion. (8) A water-permeable top sheet, a water-impermeable back sheet, a semi-rigid absorbent core fixed between the two sheets, and highly flexible sides extending outward from both lateral edges of the core. a flap, a highly flexible waist flap that extends outward from both longitudinal ends of the core, a first elastic band that creates elastic gathers in the longitudinal direction of the side flaps, and a first elastic band that stretches in the lateral direction of the waist flap. A disposable diaper comprising a second elastic band forming a gather and tape fasteners attached to both lateral sides of the dorsal region of the diaper, characterized in that: a. The side flap consists of a lower part and an upper part overlapping the lower part. b. The side flap has a first flap portion formed by joining overlapping outer portions of the upper and lower side portions to each other. c. In the side flap, the unjoined inner part of the upper part is folded back to the outside, and this folded part is joined and fixed in the front region and back region of the diaper, so that both the sides and a second flap portion formed in the crotch region between the regions. d. said first elastic band is positioned at the free end of said second flap section; e. The waist flap is formed by each portion of the top sheet and back sheet extending outward from both ends of the core in the longitudinal direction. f, the second elastic band has a thickness of 1 to 3 m;
It is made of plastic foam having a width of at least 5 mm and is interposed between the top sheet and the back sheet. (9) The diaper according to claim 8, wherein the upper portion of the side flap is formed of a breathable and waterproof sheet made of a different material from the lower portion. (10) The diaper according to claim 8, wherein the breathable and waterproof sheet is a fibrous nonwoven fabric treated to be water repellent. (11) The lower portion of the side flap is formed by a portion of the top sheet and the back sheet that extend outward from the outer edge of the core.
Diaper as described in section. (12) The diaper according to claim 8, wherein the outward folding width of the folded portion of the side flap is larger in the back region of the diaper than in the front region thereof. (13) The diaper according to claim 8, wherein the outside of the first flap portion in the crotch region of the diaper is recessed. (14) The diaper according to claim 8, wherein the first elastic band is housed in a bag portion formed at a free end of the second flap portion. (15) The second elastic band is bonded with an adhesive such that the shrinkage force at the joint surface between the band and the top sheet is stronger than the shrinkage force at the joint surface between the band and the back sheet. A diaper according to claim 8. (16) The diaper according to claim 15, wherein the outer edge of the second elastic band is exposed between the outer edges of the top sheet and the back sheet. (17) The elastic band has 2 cells (bubbles).
The diaper according to claim 15, having a density of 0 to 70 kg/m^3 and open cells.