JPH11318980A - Disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disposable diaper which is excellent in adhesion property around the leg parts, even if the width of an absorbent is increased, and has an effective shape for preventing side leakage by forming pleats on both side parts of the diaper by using a back sheet, without providing a separate rising gather. SOLUTION: This diaper is provided with a water permeable top sheet 1, a water impermeable back sheet 2 and an absorbent 3 disposed between both the sheets 1 and 2. In this case, the back sheet 2 can be folded along a side surface of the absorbent 3, and a folded-back part 4 extending inward of a disposable diaper from this folded end and a side flap part 5 extending outward of the disposable diaper from a tip of this folded-back part 4 are formed. Therefore, an elastic body 8 in an elongating state is attached between the folded-back part 4 and the side flap part 5 and an elastic body 9 in an elongating state is attached to the upper side of the side flap part 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposable diaper having a structure effective for preventing side leakage.

[0002]

2. Description of the Related Art Disposable diapers which are provided with fastening tape on both sides at one longitudinal end of the disposable diaper and are formed into a pants-type when worn are commercially available.

FIG. 1 is a perspective view of a conventional disposable diaper 20. As shown in FIG. In the disposable diaper 20, the fastening tapes 27, 27 are fixed to the target tape 29 and worn. And this disposable diaper 20
Are provided with so-called "rising gathers" G, G for standing up toward the wearer's skin and damping lateral leakage of urine and loose stool.

FIG. 2 is a partially cutaway plan view of the disposable diaper 20 of FIG. 1 with a surface in contact with a wearer's skin facing upward, and FIG. 3 is a line AA in FIG. A cross-sectional view is shown. The disposable diaper 20 is configured by laminating a rectangular top sheet 21, an hourglass-shaped absorber 22, and an hourglass-shaped back sheet 23 having a larger area than the absorber, and bonding them appropriately.

[0005] The rising gathers are a band-like member 24 such as a nonwoven fabric provided on the left and right sides of the disposable diaper, and a thread-like elastic body adhered in an extended state to the bag of the band-like member 24 bent at the tip end into a bag shape. 26. The band-shaped member 24 is adhered to the back sheet 23 in a region from both side edges of the diaper to both side edges of the top sheet 22 in the width direction of the diaper. The top sheet 21 is located in the vicinity of both ends 29 (notched portions are omitted, but there are four places).
And is glued. Therefore, between the bonding part 29 at the upper end and the bonding part 29 at the lower end in the diaper longitudinal direction, the band-shaped member 24 and the top sheet 22 are not bonded. For this reason, as shown in FIG.
4 rises toward the wearer's skin with the contraction force of the thread-like elastic body 26 attached to the distal end thereof, with the bonding line between the band-shaped member 24 and the side edge of the top sheet 22 as the base end,
This will form a weir to prevent lateral leakage of urine and loose stool.

On the other hand, in order to secure the adhesion around the legs,
Between the belt-like member 24 and the back sheet 23, the thread-like elastic body 2
5, 25 are adhered, thereby forming leg gathers.

[0007]

In such a conventional disposable diaper, the width of the absorber near the center of the crotch is reduced so as not to hinder the stretching force of the leg gathers. Since the urine and loose stool are most likely to leak near the center of the inseam, it is preferable that the width of the absorber is wide. However, if the width of the absorber is widened, the distance between the absorber and the leg gathers becomes narrow. Since the rigidity of the absorber is greater than the contraction force of the leg gathers, there is a problem that if the distance between the absorber and the leg gathers is narrow, the adhesion around the legs becomes worse, and lateral leakage occurs. In addition, since the rising gathers for preventing leakage are provided as separate members, the number of steps during continuous manufacturing increases, which is a factor that hinders speeding up.

Therefore, an object of the present invention is to form pleats on both sides of a diaper using a back sheet without providing a separate rising gather, so that even if the width of the absorber is widened, the area around the legs can be improved. An object of the present invention is to provide a disposable diaper having an excellent shape and effective in preventing side leakage.

[0009]

The invention according to claim 1 is
In a disposable diaper including a water-permeable top sheet, a water-impermeable back sheet, and an absorber disposed between the two sheets, the back sheet is folded along a side surface of the absorber, and A folded portion extending inward from the disposable diaper and a side flap portion extending outward from the tip of the folded portion of the disposable diaper are formed, and an extended state is provided between the folded portion and the side flap portion. An elastic body is additionally provided, and an extended elastic body is provided above the side flap portion. According to this configuration, since the pleats are formed on the left and right sides of the diaper by the folded portion and the side flap portions, a wide leg gather that can closely adhere around the legs is formed regardless of the width of the absorber. can do.

According to a second aspect of the present invention, in the disposable diaper according to the first aspect, the top sheet is fixed to the absorbent body, and the folded portion is fixed to the top sheet only in the vicinity of the longitudinal center of the disposable diaper. Is what you are doing. According to this configuration, since the pleats open on the wearer's abdomen and back side, a disposable diaper having no tightness around the waist and having excellent adhesion can be provided. Further, since the top sheet and the absorber are fixed, urine is absorbed quickly.

According to a third aspect of the present invention, in the disposable diaper according to the first aspect, the top sheet is fixed to the absorber, and the folded portion is provided only with the top sheet near the longitudinal ends of the disposable diaper. It is stuck. According to this configuration, since the base end of the pleat becomes the end of the diaper, the pleat opens at the crotch portion, and the absorber of the urination part can be formed to be wide, and the lateral leakage of urine can be minimized. Can be prevented.

According to a fourth aspect of the present invention, in the disposable diaper according to the first aspect, the folded portion is fixed to the absorber only in the vicinity of the longitudinal center of the disposable diaper. They are fixed to the base ends of the left and right side flap portions. According to this configuration, a disposable diaper having no tightness around the waist and having excellent adhesion can be provided as in the invention according to the second aspect. Also, since the top sheet is not fixed to the absorber, but is fixed to the side flap part,
When the pleats are opened, a gap is formed between the top sheet and the absorber, so that the inconvenience of moisture such as urine absorbed by the absorber re-contacting the wearer can be eliminated.

According to a fifth aspect of the present invention, in the disposable diaper according to the first aspect, the folded portion is fixed to the absorber only in the vicinity of both ends in the longitudinal direction of the disposable diaper. It is fixed to the base end of the side flap portion. According to this configuration,
As in the invention according to the third aspect, the absorber in the urination part can be formed to be wide, and lateral leakage of urine can be prevented as much as possible. The effect of the pleats is the same as that of the invention according to claim 4.

[0014]

4 and 5 show a first embodiment of the present invention.
5 shows an embodiment of the disposable diaper according to Nos. 3 to 3, and FIG. 5 is a sectional view taken along line BB of FIG. The disposable diaper D1 has a top sheet 1 on the uppermost surface side (a human body contact surface side), an absorbent body 2 below the top sheet 1, and a back side below the top sheet 1 in the width direction central portion of the diaper. Sheets 3 are provided, respectively, and have a laminated structure in which the absorber 2 is sandwiched between the top sheet 1 and the back sheet 3.

As the top sheet 1, a water-permeable material such as a non-woven fabric having a soft touch or an apertured film having an excellent dry feeling is used. The absorber 2 is made of a material which is appropriately mixed with pulp fiber, water-absorbing polymer powder, thermoplastic fiber and the like, molded into a mat shape, and wrapped with a carrier sheet such as nonwoven fabric or paper. As the back sheet 3, a fine aperture film, a nonwoven fabric subjected to a water-repellent treatment, or a laminated sheet thereof is used. It is preferable that the top sheet 1, the absorber 2, and the back sheet 3 are bonded by, for example, a hot melt adhesive applied in a mist, dot, or spiral shape so as not to impair water permeability and air permeability.

Further, the disposable diaper D1 has fastening tapes 7, 7 for forming into a pants-type when worn.
Are provided on the left and right side edges of both ends in the longitudinal direction of the diaper. When the fastening tape uses an adhesive, the target tape is provided on the back sheet side near the other longitudinal end, as in the conventional diaper shown in FIG. Further, a mechanical fastening system may be used.

According to the present invention, the back sheet 3 is
Has a bottom surface portion 3a in contact with the bottom surface of the absorber 2 and a side surface portion 3b in contact with the side surface of the absorber 2, and is bent along the bottom surface and side surfaces of the absorber 2 (see FIG. 5). In order to maintain this folded state, it is preferable to bond the side surface of the absorber 2 to the back sheet side surface portion 3b. A folded portion 4 extends from the folded end 31 of the backsheet toward the inside of the disposable diaper. Further, a side flap portion 5 extends from the tip 41 of the folded portion 4 toward the outside of the disposable diaper. Both the folded portion 4 and the side flap portion 5 are preferably formed by extending the back sheet 3 to both side edges of the absorber and passing through the folding process, so that these are integrated with the back sheet. It is formed using a member. It is preferable to provide a side sheet 6 on the side flap portion 5. The side flap portion 5 and the side sheet 6 form an outer shape of a substantially hourglass-shaped disposable diaper D1 having notches K, K for legs.

An elastic body 8 is provided between the folded portion 4 and the side flap portion 5 in an extended state. That is, the folded portion 4 and the side flap portion 5 are fixed at an attached portion of the elastic body 8. Therefore, the pleat, which is a feature of the present invention, starts from the fixed portion of the elastic body 8 to the tip 4 of the folded portion 4.
Since it will not open until 1
Is preferably disposed near the tip 41 of the folded portion 4, and the elastic body 8 is preferably provided with only one thread-like elastic body such as a polyurethane thread.

On the other hand, the left and right four elastic members 9 are attached to the side flap portion 5 in an extended state. Since the structure of the disposable diaper of the present invention can form a wide leg gather without being caught by the width of the absorber, the side flap portion 5 is not limited to four left and right side examples,
It is preferable to provide a large number of elastic bodies separated from each other. The elastic members 9 provided on the side flap portion 5 do not need to be provided over the entire length of the disposable diaper, but may be provided only in the vicinity of the notch K for leg hole (region X in FIG. 4).

The disposable diaper of the present invention thus constructed is folded back when the absorbent body 2 hangs down as shown in FIG. 6 when worn or when the weight of the absorbent body increases due to urination. The part 4 rises with respect to the absorber. That is, the pleats are opened. For this reason, a leg gather is formed by the surface formed from the vicinity of the tip of the side flap portion 5 and the folded portion 4, and a wide and surface-contact leg gather is formed. As a result, a gather having excellent adhesion can be formed without giving a feeling of pressure to the leg circumference.
Furthermore, the pocket P is formed by the opened folded portion 4.
Is formed, the function as a weir for preventing lateral leakage of urine can also be exhibited. Furthermore, the width of the absorber 2 is
Since it can be freely determined without being affected by the width of the side flap portion 5 or the width of the folded portion 4, there is no need to use an hourglass-shaped absorber having a constricted center at the center as in the conventional diaper. It became possible to make it a rectangular absorber. Therefore, the disposable diaper has a sufficient absorbing power in the vicinity of the crotch part where urination occurs, and can prevent lateral leakage of urine.

Although the side sheet 6 is provided on the side flap portion 5, the side sheet 6 is not an essential member. However, the elastic body 9 is connected to the side flap 5
Because it is useful as a holding member when bonding to
It is recommended to use. Since the side sheet 6 is a member that comes in contact with the skin, it is preferable that the side sheet 6 be a nonwoven fabric with a soft touch. The side sheet 6 may be formed by further folding the side flap portion 5. The fastening tape 7 is preferably adhered to the lower side of the side flap portion 5 when the side sheet 6 is not provided, and between the side sheet 6 and the side flap portion 5 when the side sheet 6 is provided. It is good to be sandwiched between them.

If the folded portion 4 is adhered to the top sheet 1 on the absorber 2 over the entire length of the diaper in the longitudinal direction, the pleat, which is a feature of the present invention, cannot be opened.
Preferably, they are not bonded at all or are partially bonded. In particular, as shown in the plan view of FIG. 7, two fastening portions 10, 10 near the longitudinal center of the disposable diaper, or fastening portions 11, 1 near both ends in the longitudinal direction.
It is preferable to fasten to the top sheet 1 at the four locations 1. When the folded portion 4 and the top sheet 1 are fixed only in the vicinity of the center in the longitudinal direction of the diaper, the pleats open on the wearer's abdomen and back, so that there is no feeling of pressure around the waist and close contact. Can provide excellent disposable diapers. Further, when the folded portion 4 and the top sheet 1 are fixed only in the vicinity of both ends in the longitudinal direction,
Since the base end of the pleat is the end of the diaper, the pleats open most in the crotch portion. For this reason, the absorber of the urination part can be formed wide, and lateral leakage of urine can be prevented as much as possible.

8 and 9 show an embodiment of the disposable diaper according to claims 4 and 5 of the present invention, and FIG. 9 is a sectional view taken along the line CC of FIG. This disposable diaper D2
4 and 5 are different from the examples shown in FIGS. 4 and 5 in that both side edges of the top sheet 1 are fixed to the base ends 51 of the left and right side flap portions 5. In this embodiment, the folded portion 4 is provided only in the vicinity of the longitudinal center of the disposable diaper (two regions indicated by reference numeral 10 in FIG. 7) or only in the vicinity of both ends in the longitudinal direction (indicated by reference numeral 11 in FIG. 7). 4 areas)
It is preferable to fix directly on the carrier sheet of the outermost layer of the absorber 2. In addition, the top sheet 1 may be fixed on the side sheet 6.

According to this configuration, since the top sheet 1 is not fixed to the absorber 2 but is fixed to the side flap portion 5, when the pleats are opened, the top sheet 1 is located between the top sheet and the absorber. A void is formed, and the inconvenience that moisture such as urine absorbed by the absorber touches the wearer again can be eliminated. When the width of the folded portion 4 is increased by increasing the width of the absorber 2, it is preferable that the top sheet is configured to be stretchable so that the opening of the pleats is not limited by the width of the top sheet. In order to make the top sheet stretchable, a stretchable material may be used, or a slit or pleat may be formed in the top sheet in the longitudinal direction.

Although the disposable diaper of the present invention has a feature in the structure described above, it is possible to add waist gathers and various design changes known in the art. Hereinafter, an example of a method for manufacturing a disposable diaper of the present invention will be briefly described.

FIGS. 10A to 10D are perspective views of the diaper according to claim 2 or 3 as viewed from the longitudinal edge. The same members as those shown so far are denoted by the same reference numerals. At the edge of the diaper, the top sheet 1 and the back sheet 3 extend outward from the absorber 2. In the actual manufacturing process, the top sheet 1
For the back sheet 3, a continuous sheet is used, and a method of manufacturing by mounting the absorber 2 at predetermined intervals is adopted.

First, in FIG. 10A, the back sheet 3 to which the elastic body 8 has already been attached is removed from the side flap portion 5.
Is used in a state of being folded downward (opposite the absorber contact surface), and the absorber 2 and the top sheet 3 are placed thereon.

In FIG. 10B, the back sheet 3 is folded on the top sheet 1 along the side surface of the absorber 2 (which is no longer visible). By this folding, a folded portion 4 is formed. Subsequently, in FIG. 10 (c), the elastic members 9, 9,... At this time, since the elasticity of the elastic body 9 is not required for the side flap portions other than the region X in FIG. 4, the side flap portion 5 and the elastic body 9 need only be adhered to the region X. After cutting into individual diapers in the continuous manufacturing process, only the elastic portion not adhered to the side flap portion 5 contracts.

At the same time as the elastic body 9 is adhered or in the sequential step,
The side sheet 6 is placed on the side flap portion 5, and the side sheet 6 and the side flap portion 5 are cut at once.
A leg notch K is formed. Although not shown, a step of disposing an elastic body along the diaper edge between the top sheet 1 and the back sheet 3 at the diaper edge and bonding the top sheet 1 and the back sheet 3 is shown in FIG. Before the step (a), simultaneously with any of the steps (a) to (d), or after FIG. 10 (d), the disposable diaper can be manufactured by being incorporated before and after the step of cutting into individual diapers.

[0030]

According to the first aspect of the present invention, since pleats are formed on the left and right sides of the diaper by the folded portion and the side flap portion, regardless of the width of the absorber,
A wide leg gather can be formed that can be closely attached around the leg.

According to the second aspect of the present invention, since the pleats are opened on the wearer's abdomen and back, a disposable diaper having no tightness around the waist and having excellent adhesion can be provided. Further, since the top sheet and the absorber are fixed, urine is absorbed quickly.

According to the third aspect of the present invention, since the base end of the pleat is the end of the diaper, the pleat opens at the crotch portion, so that the absorber for the urination part can be formed wide, and the urine can be formed. Lateral leakage can be prevented as much as possible.

According to the fourth aspect of the present invention, since the top sheet is not fixed to the absorber, a gap is formed between the top sheet and the absorber when the pleats are opened. The inconvenience that the absorbed moisture such as urine touches the wearer again can be eliminated.

According to the fifth aspect of the present invention, similarly to the third aspect of the present invention, the absorber of the urination part can be formed to be wide, and lateral leakage of urine can be prevented as much as possible. Thus, the same pleat forming effect as the invention according to claim 4 can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a conventional disposable diaper.

FIG. 2 is a partially cutaway plan view of the disposable diaper of FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a partially cutaway plan view of the disposable diaper according to the present invention.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

FIG. 6 is a sectional view showing a disposable diaper according to the present invention in a worn state.

FIG. 7 is an explanatory plan view showing a fastening portion.

FIG. 8 is a partially cutaway plan view of another embodiment of the disposable diaper according to the present invention.

FIG. 9 is a sectional view taken along the line CC of FIG. 8;

FIGS. 10A to 10D are perspective views showing a method for manufacturing a disposable diaper according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Top sheet 2 Absorber 3 Back sheet 4 Folding part 5 Side flap part 6 Side sheet 8, 9 Elastic body 10, 11 Fastening part

Claims (5)

[Claims] 1. A disposable diaper including a water-permeable top sheet, a water-impermeable back sheet, and an absorber disposed between the two sheets, wherein the back sheet is bent along a side surface of the absorber. In addition, a folded portion extending from the folded end to the inside of the disposable diaper, and a side flap portion extending from the tip of the folded portion to the outside of the disposable diaper are formed, and the folded portion and the side flap portion A disposable diaper characterized in that an elastic body in an extended state is provided therebetween and an elastic body in an extended state is provided above a side flap portion. 2. The disposable diaper according to claim 1, wherein the top sheet is fixed to the absorber, and the folded portion is fixed to the top sheet only in the vicinity of the longitudinal center of the disposable diaper. . 3. The disposable diaper according to claim 1, wherein the top sheet is fixed to the absorbent body, and the folded portion is fixed to the top sheet only in the vicinity of both longitudinal ends of the disposable diaper. . 4. The folded portion is fixed to the absorber only in the vicinity of a longitudinal center of the disposable diaper, and both side edges of the top sheet are fixed to base ends of left and right side flap portions. The disposable diaper according to claim 1. 5. The disposable diaper according to claim 1, wherein the folded portion is fixed to the absorber only in the vicinity of both longitudinal ends of the disposable diaper, and both side edges of the top sheet are fixed to base ends of left and right side flap portions. The disposable diaper according to claim 1.