JP4233002B2 - Pants-type disposable diaper - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pants-type disposable diaper.
[0002]
[Prior art]
Conventionally, as a pants-type disposable diaper, an absorber is interposed between a top sheet and an inner sheet, and a waist opening, a waist part, and a pair of left and right leg openings are provided between the top sheet and the inner sheet. There has been proposed a structure in which an elastic member capable of expanding and contracting is incorporated and the left and right side edges of the waist portion are joined to each other (see Japanese Patent Application Laid-Open No. 2000-107225).
[0003]
In such a conventional technique, a thermoplastic synthetic resin film or a liquid-impervious surface sheet obtained by laminating a nonwoven fabric on this film and an inner surface sheet made of a thermoplastic synthetic fiber nonwoven fabric are disposed directly above the waistline elastic member. The waistline elastic member is bonded to the topsheet only in the vicinity of the portion where the left and right side edges of the waistline portion are joined.
[0004]
In this configuration, the waist elastic member that crosses the absorber is separated from the surface sheet and the absorber at the crossing portion. The sheet and the absorbent body are less likely to be deformed, and an effect that the absorbent body adheres well to the body can be achieved.
[0005]
[Problems to be solved by the invention]
However, since the waist elastic member is bonded only to the top sheet, it is not practical because such bonding itself is very difficult in the high-speed continuous manufacturing process of the diaper.
[0006]
Moreover, since the liquid-impervious surface sheet is formed by laminating a thermoplastic synthetic resin film or a non-woven fabric on this film, the air permeability is poor and it tends to cause discomfort.
[0007]
Further, the elastic member for the waistline is adhered to the surface sheet only in the vicinity of the portion where the left and right side edges of the waistline portion are joined, and is not adhered to the surface sheet at the portion of the absorber. The diaper looks bad because of the floating phenomenon on the sheet.
[0008]
The present invention has been made to solve the above-described conventional problems, and is suitable for a high-speed continuous manufacturing process, has good air permeability, and has been devised so as not to cause a floating phenomenon on an outer surface side sheet (surface sheet). It aims at providing a type disposable diaper.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention comprises a diaper main body constituted by an outer surface side sheet and a skin surface side sheet, and the upper and lower surfaces of the absorbent core are a liquid-permeable top sheet and a liquid-impermeable back sheet. The back sheet of the absorbent body covered with each is bonded to the skin surface side sheet, and at least the waist area opening, the waist area, and the pair of left and right legs around the outer surface sheet and the skin surface sheet. A pants-type disposable diaper in which an elastic member capable of expanding and contracting is incorporated, and the left and right side edges of the waistline part are joined together,
Both the outer surface side sheet and the skin surface side sheet are formed of at least a breathable thermoplastic synthetic fiber nonwoven fabric, and the waistline elastic member is disposed between the outer surface side sheet and the skin surface side sheet, The absorber back sheet is bonded to the skin-side sheet and is positioned directly above the waist elastic member, and the left and right side edges of the waist portion are joined to the waist elastic member. The pants-type disposable diaper is characterized in that it is adhered between the outer surface side sheet and the skin surface side sheet only at the position and the vicinity thereof.
[0010]
According to the present invention, the elastic member for the waistline is bonded between the outer surface side sheet and the skin surface side sheet only at the portion where the left and right side edges of the waistline portion are joined and in the vicinity thereof. Even when the waistline elastic member contracts, the outer surface side sheet and the absorbent body are hardly deformed.
[0011]
In addition, since the elastic member for the waistline is bonded to the outer sheet and the skin sheet, it adheres to both sheets in the high-speed continuous manufacturing process of diapers compared to the conventional technique that bonds only to the outer sheet. This technique makes it easier to bond.
[0012]
Further, both the outer surface side sheet and the skin surface side sheet are made of at least a breathable thermoplastic synthetic fiber nonwoven fabric, and as in the prior art, the outer surface side sheet is a thermoplastic synthetic resin film or a nonwoven fabric on this film. Since it is not formed by laminating, the air permeability becomes good.
[0013]
Note that the “near position” is between a portion where the left and right side edges of the waistline portion are joined and both ends in the width direction of the absorber.
[0014]
As in claim 2, if the outer surface side sheet and the skin surface side sheet are configured to be bonded to each other without adhering the waistline elastic member at least in a portion where the absorber is located, the absorber The “floating” phenomenon of the outer sheet at the portion does not occur.
[0015]
The “adhesion” may be a full adhesion by full application of an adhesive or a partial adhesion with a gap such as a dot shape or a spiral shape.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0017]
1 is a perspective view showing an example of a pants-type disposable diaper 1, FIG. 2 is a front view in an unfolded state, FIG. 3 (a) is a cross-sectional view taken along line AA in FIG. 2, and (b) is BB in FIG. FIG. 4C is a sectional view taken along line C-C in FIG. 2, and FIG. 4 is an exploded perspective view.
[0018]
As shown in FIG. 4, the pants-type disposable diaper 1 basically includes an outer surface side sheet 2, a skin surface side sheet 3, and an absorbent body 4.
[0019]
The outer surface side sheet 2 and the skin surface side sheet 3 constitute a diaper body, and both the sheets 2 and 3 are formed of a thermoplastic synthetic fiber nonwoven fabric having air permeability at least in a pants outer shape.
[0020]
Leg holes S are formed on both sides of the crotch portion R between the waistline portion (front abdomen portion) P and the waistline portion (rear portion) Q in both the sheets 2 and 3.
[0021]
A plurality of waistline opening elastic members 5 and a waistline elastic member 6 are attached to the upper surfaces of the waistline portions P and Q of the outer surface side sheet 2 in an expanded state in the width direction. A plurality of leg-around elastic members 7 are attached to the leg hole portions S so as to extend in the length direction along the periphery of each leg hole portion S. The leg elastic member 7 is attached so as to cross the crotch portion R in the stretched state in the width direction, and after the attachment, only the leg elastic member 7 of the crotch portion R is cut with a cutter, The contraction force does not act on the crotch R.
[0022]
Each of the elastic members 5 to 7 is formed of a strip-like or thread-like natural rubber or synthetic rubber.
[0023]
The skin surface side sheet 3 has the same outer shape as the outer surface side sheet 2, but the length is formed to be shorter than the outer surface side sheet 2, and the waistline elastic member 6 and the leg periphery elastic member 7 is sandwiched between the outer sheet 2 and the outer sheet 2. Note that the waistline elastic member 6 is not entirely bonded between the skin surface side sheet 3 and the outer surface side sheet 2, and details thereof will be described later.
[0024]
As shown in FIG. 3A, the waist opening elastic member 5 is bonded with an adhesive a while being sandwiched between folded portions 2 a at the front and rear end portions of the outer sheet 2.
[0025]
The absorbent core 4a of the absorbent body 4 is formed by mixing or laminating natural pulp fibers, synthetic resin fibers, superabsorbent resin materials, etc. into a flat hourglass shape, and the outer periphery is wrapped with a thin paper, and further its upper surface Is covered with the liquid-permeable top sheet 4b and the lower surface is covered with the liquid-impermeable back sheet 4c, and the peripheral edge thereof is sealed. As shown in FIG. 3B, the absorber 4 has a back sheet 4 c bonded to the upper surface of the skin surface side sheet 3 with an adhesive b.
[0026]
The folded portion 2a at the front and rear end portions of the outer surface side sheet 2 is bonded to the upper surface of the top sheet 4b of the absorbent body 4 with an adhesive a in the portion of the absorbent body 4, as shown in FIG. Like 3 (a), in the part of the skin surface side sheet | seat 3, it will adhere | attach on the upper surface of the skin surface side sheet | seat 3 with the adhesive agent a.
[0027]
Then, the diaper main body (2, 3) in FIG. 4 is folded inwardly with the crotch portion R as a boundary, and the left and right side edges 1a, 1b of the waist portions P, Q are respectively bonded, It will be assembled in the use state of FIG.
[0028]
On the other hand, the back sheet 4c of the absorbent body 4 is bonded to the upper surface of the skin surface side sheet 3 with an adhesive b so as to be located directly above the waistline elastic member 6.
[0029]
The waist elastic member 6 has a portion where the left and right side edges 1a and 1b of the waist portions P and Q in FIGS. 4 and 2 are bonded to each other and a position in the vicinity thereof (with a width W1 in FIG. 2). In the range (refer to cross-hatching)), the outer side sheet 2 and the skin side sheet 3 are bonded with the adhesive c, and in the region of the absorbent body 4 and its vicinity (the range of the width W2 in FIG. 2) It is not glued.
[0030]
Further, as shown in FIGS. 3B and 3C, the outer surface side sheet 2 and the skin surface side sheet 3 are not bonded to the waistline elastic member 6 at the portion where the absorber 4 is located, that is, The outer surface side sheet 2 and the skin surface side sheet 3 only between the waist elastic members 6 are linearly bonded to each other in the width direction with an adhesive c ′.
[0031]
In the pants-type disposable diaper 1 configured as described above, the waistline elastic member 6 is formed on the outer surface side only at the position where the left and right side edges 1a and 1b of the waistline portions P and Q are bonded to each other and in the vicinity thereof. Since the sheet 2 and the skin surface side sheet 3 are bonded with the adhesive c in the range of the width W1, and are not bonded in the range of the width of the absorber 4 and the width W2 in the vicinity thereof, the waistline elasticity Even if the member 6 contracts, the outer surface side sheet 2 and the absorbent body 4 positioned in the absorbent body 4 are less likely to be deformed, so that the absorbent body 4 comes into close contact with the body and urine leakage is reduced. become.
[0032]
In addition, since the waist elastic member 6 is bonded to the outer sheet 2 and the skin sheet 3, the conventional technique of bonding only the outer sheet 2 in the high-speed continuous manufacturing process of the pants-type disposable diaper 1. Compared with the present embodiment, the adhesion to the both sheets 2 and 3 becomes easier as in this embodiment, so that the practicality is excellent.
[0033]
Furthermore, both the outer surface side sheet 2 and the skin surface side sheet 3 are formed of a thermoplastic synthetic fiber nonwoven fabric, and the outer surface side sheet 2 is laminated with a thermoplastic synthetic resin film or a nonwoven fabric on this film as in the prior art. Therefore, comfort is improved because the air permeability is good.
[0034]
Furthermore, since the outer surface side sheet 2 and the skin surface side sheet 3 are bonded to each other without adhering the waistline elastic member 6 in the region of the absorbent body 4 and the width W2 in the vicinity thereof, absorption is performed. Since the “floating” phenomenon of the outer sheet 2 in the body 4 portion does not occur, the appearance is improved.
[0035]
In the above-described embodiment, the absorber 4 is present just above the entire waist elastic member 6 (see FIG. 3B), but as shown in FIG. May be relatively short, and the absorbent body 4 may be present directly above a portion of the waistline elastic member 6. In this case, the air permeability of the diaper main body (2, 3) is improved by the short amount of the absorbent body 4. In addition, 10 is an additional nonwoven fabric bonded across the folded portion 2a at the front and rear end portions of the outer surface side sheet 2 and the top sheet 4b of the absorbent body 4.
[0036]
【The invention's effect】
As is clear from the above description, the present invention provides an elastic member for the waistline between the outer surface side sheet and the skin surface side sheet only at a portion where the left and right side edges of the waistline portion are joined and in the vicinity thereof. Since the outer circumference side sheet and the absorbent body are less likely to be deformed even when the waist elastic member contracts, the absorbent body comes into close contact with the body and urine leakage is reduced. It becomes like this.
[0037]
In addition, since the elastic member for the waistline is bonded to the outer sheet and the skin sheet, it adheres to both sheets in the high-speed continuous manufacturing process of diapers compared to the conventional technique that bonds only to the outer sheet. Since this technique makes it easier to bond, it becomes more practical.
[0038]
Further, both the outer surface side sheet and the skin surface side sheet are made of at least a breathable thermoplastic synthetic fiber nonwoven fabric, and as in the prior art, the outer surface side sheet is a thermoplastic synthetic resin film or a nonwoven fabric on this film. Since it is not formed by laminating, the air permeability is improved, so that the comfort is improved.
[0039]
Furthermore, if the outer surface side sheet and the skin surface side sheet are configured to adhere to each other without adhering the waistline elastic member at least in the portion where the absorber is located (Claim 2), the absorber portion Since the “floating” phenomenon of the outer sheet does not occur, the appearance is improved.
[Brief description of the drawings]
FIG. 1 is a perspective view of a pants-type disposable diaper.
FIG. 2 is a front view of an unfolded state of a pants-type disposable diaper.
3A is a cross-sectional view taken along line AA in FIG. 2, FIG. 3B is a cross-sectional view taken along line BB in FIG. 2, FIG. 3C is a cross-sectional view taken along line CC in FIG. It is sectional drawing of the modification corresponding to the BB line of FIG.
FIG. 4 is an exploded perspective view of a pants-type disposable diaper.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pants type disposable diaper 1a, 1b Left right edge 2 Outer surface side sheet 3 Skin surface side sheet 4 Absorber 4a Absorbent core 4b Top sheet 4c Back sheet 5 Elastic member 6 for trunk periphery opening Elastic member 7 for trunk periphery Elastic member P waist area (front abdomen)
Q trunk circumference (back)
S Leg hole R Crotch

Claims (2)

The diaper body is composed of the outer sheet and the skin sheet, and the upper and lower surfaces of the absorbent core are covered with a liquid-permeable top sheet and a liquid-impermeable back sheet, respectively. Is bonded to the skin surface side sheet, and an elastic member that allows expansion and contraction of at least the waist area opening, the waist area, and the pair of left and right leg openings is incorporated in the outer surface sheet and the skin surface sheet. , A pants-type disposable diaper in which the left and right side edges of the waistline part are joined together,
Both the outer surface side sheet and the skin surface side sheet are formed of at least a breathable thermoplastic synthetic fiber nonwoven fabric, and the waistline elastic member is disposed between the outer surface side sheet and the skin surface side sheet, The back sheet of the absorber is bonded to the skin side sheet positioned directly above the waist elastic member, and the waist elastic member is joined to the left and right side edges of the waist portion. The outer surface side sheet and the skin surface side sheet are adhered to the outer surface side sheet and the skin surface side sheet only at the position and the vicinity thereof , and the outer surface side sheet and the skin surface side sheet are at least at the portion where the absorber is positioned, A pants-type disposable diaper characterized by being bonded to each other between the elastic members for each waist without being bonded . The outer surface side sheet and the skin surface side sheet are bonded to each other in the width direction between the elastic members for the waistline without bonding the elastic members for the waistline at least at the portion where the absorber is located. The pants-type disposable diaper according to claim 1.

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