JP4162169B2 - Paper diapers with excellent breathability - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disposable paper diaper, and is particularly effective for leakage of excreta during wearing and stuffy skin.
[0002]
[Prior art]
As shown in FIGS. 1 and 2, the disposable diaper basically has an absorbent body (3) interposed between a liquid-impermeable back sheet (1) and a liquid-permeable top sheet (2), and has a planar shape. The main body structure in which the central part in the longitudinal direction is constricted. And the engagement of one of the fastening tapes (4a) to (4d) using an adhesive or a mechanical fastener such as a Velcro fastener on the outer surface of the liquid-impermeable back sheet (1) which becomes the back side when worn. The fastening tape which formed the member is extended, and the three-dimensional gathers (7a) (7b) which become a standing state along this longitudinal direction are provided in the longitudinal direction both sides part of a long main body.
[0003]
The three-dimensional gathers (7a) and (7b) are, for example, side sheets (10a) made of a water-repellent nonwoven fabric such as polyethylene, polypropylene, and PET, with one side edge joined to both side edges on the inner side of the backsheet (1). (10b) is extended inward and joined to the top sheet (2) continuously by means such as heat sealing at the seal lines (12a) (12b) along the side edges in the longitudinal direction of the absorbent body (3). By doing so, it is formed by the further extended inner side seat portion and the elastic member (11) for three-dimensional gathers provided at the tip edge. Furthermore, both ends (a1) to (a4) in the longitudinal direction of the three-dimensional gather tip edge are joined to the top sheet (2).
[0004]
Also, the elastic for long leg gathers along the longitudinal direction in order to form leg gathers (5a) (5b) at the joint part of the constricted part of the back sheet (1) with the side sheets (10a) (10b) A frontal tape (not shown) that engages the fastening tapes (4a) to (4d) on the outer surface of the liquid-impervious backsheet (1) that becomes the ventral side when the member (6) is sandwiched and further worn. The other engagement sheet of a polypropylene sheet or a mechanical fastener is fixed.
[0005]
[Problems to be solved by the invention]
Such a three-dimensional gather is provided for the purpose of preventing side leakage of excrement when wearing a disposable diaper, and has a structure in which the tip edge rises continuously along the longitudinal direction and closely contacts the skin when worn. It has become.
[0006]
However, although the water-repellent nonwoven fabric used for three-dimensional gathers has air permeability, the effect of eliminating the stuffiness due to excrement and perspiration from the skin is not sufficient. Therefore, when a non-woven fabric having a further increased air permeability is used to cope with this, there is a problem that the effect of preventing side leakage is reduced.
In addition, in recent years, “sultry paper diapers” that use breathable materials for the backsheet have been put on the market. It wasn't.
[0007]
[Means for Solving the Problems]
As a result of various examinations in view of this, the present invention has achieved both the elimination of stuffiness and the prevention of leakage when wearing a disposable diaper.
[0008]
A long main body in which an absorbent body is disposed between a liquid-permeable top sheet and a liquid-impervious back sheet, and base end edges along the left and right sides in the longitudinal direction of the liquid-permeable top sheet surface of the long main body. In a paper diaper having a fixed and at least three-dimensional gathers that stand up when worn, the base edge of the three-dimensional gathers is used as a leak-proof zone, and the leading edge is used as a ventilation zone. In paper diapers, it is effective to set the air permeability of the ventilation zone to be larger than the air permeability of the leakage prevention zone, and further provide a large number of openings in the ventilation zone, and further provide or not provide openings in the leakage prevention zone. It is effective to make the number density or the total opening area of the openings larger than the number density or the total opening area of the openings in the leakage prevention zone.
[0009]
The present invention is in such a paper diaper, a part of the leakproof zone, and / or a portion of the ventilation band, which breathability than the leak prevention band and weak ventilation unit is less breathable than good vent band Furthermore, a weak ventilation zone is provided between the leakage prevention zone and the ventilation zone, a weak ventilation portion is provided at the center in the longitudinal direction of the ventilation zone, and / or a weak ventilation is provided at both ends in the longitudinal direction of the leakage prevention zone. It is also good to provide a part. In addition, a large number of openings are provided in the ventilation zone and the weak ventilation part, and an opening is provided in the leakage prevention band or not provided, and the number density or total opening area of each of the ventilation band, the weak ventilation part, and the leakage prevention band It is also good to restrict the size to the following inequality relationship.
Ventilation zone ≧ weak ventilation portion> leakage prevention zone Further, the number density of the openings or the total opening area may be continuously changed from the ventilation zone to the leakage prevention zone.
Further, as the three-dimensional gathering of the paper diaper, one made of any one of a nonwoven fabric, a plastic film, and a woven fabric or a combination of any two or more types is effective.
[0010]
In the present invention, the above air permeability is compared based on the number density of openings and the total opening area, but the following may be considered as other factors.
That is, (1) sheet thickness of the three-dimensional gather: If the number density of openings and the total opening area are the same, the larger the thickness of the three-dimensional gather sheet, the worse the air permeability. {Circle around (2)} Basis weight (basis weight) of a three-dimensional gather: If the sheet thickness is the same, the heavier the basis weight, the worse the air permeability. (3) Fibers used for the three-dimensional gathered sheet: Synthetic fibers usually have a smoother surface and therefore have better air permeability.
[0011]
In addition, as said opening, a micro hole of the shape of ○, □, ◇, △, an ellipse, other squares, etc. by cutting or punching, V, Y, X, L, U-shape or ~, *, + shape, etc. There may be an incision, a slit, etc., and embossing may be applied to penetrate the top. The number density of openings refers to the number of openings formed per unit area of the sheet.
[0012]
【Example】
Examples of the present invention will be described below. That is, the three-dimensional gathers (7a) and (7b) of the paper diaper in FIGS.
[0013]
( Reference Example 1)
A three-dimensional gather (7c) (7d) as shown in FIG. 3 consisting of a base end edge composed of a sheet having a two-layer structure in which a thin film plastic film and a non-woven fabric are bonded together and a front end edge extending only the non-woven fabric in the standing direction. ) Made paper diapers. That is, the base edge (15) of the three-dimensional gather is a portion connected to the paper diaper body, and the tip edge (16) of the three-dimensional gather is a portion that is in close contact with the skin when worn. The belt-shaped region made of non-woven fabric along the leading edge (16) of the three-dimensional gather is made into a ventilation zone (17) in which a large number of minute round holes are formed, and is made of a two-layer structure sheet along the base edge (15). Since the region was not subjected to any processing, a leakage prevention zone (18) having no air permeability was set.
[0014]
Such a disposable diaper (19) is in a state as shown in FIG. 4 when worn, and excrement is absorbed directly into the interior after reaching the upper surface of the absorbent body (3) or moved laterally. The base end edges of the three-dimensional gathers (7c) and (7d) standing on both sides of (3) are wetted. However, since the base edge portion is a non-breathable leak prevention zone (18), excreta does not leak through the three-dimensional gathers (7c) (7d). Moreover, since the tip edge part close | similar to the skin (20) of a three-dimensional gather (7c) (7d) is an aeration zone | band (17) which has many fine openings, the effect which escapes the water vapor | steam from skin and excrement rapidly outside. is there.
[0015]
(Example 2)
As shown in FIG. 5, a thin plastic film is used to provide a ventilation zone (17) in which a number of micro cuts are formed at the tip edge, and the base edge is an unprocessed leakage prevention zone (18). Furthermore, a weak ventilation zone (21) is provided between the ventilation zone (17) and the leakage prevention zone (18) with the number density of the X-shaped notches being reduced to about 1/3 of the ventilation zone (17). A disposable diaper having three-dimensional gathers (7e) and (7f) was prepared.
According to such a paper diaper, the weak ventilation zone (21) also exhibits a ventilation effect, particularly if there is relatively little excrement and the wet ventilation zone (21) is not wetted. Even if the zone (21) gets wet, there are not many openings as in the ventilation zone (17), so there is very little leakage. That is, both the effect of eliminating stuffiness and the effect of preventing leakage are great.
[0016]
(Example 3)
As shown in FIG. 6, a ventilation zone (17) in which a large number of oval cutout microholes are formed at the front end edge is used by using a sheet with a two-layer structure in which a thin plastic film and a nonwoven fabric are bonded together. However, only the central portion in the longitudinal direction is a weak ventilation portion (22) in which the number density of the cutout holes is about 1/4 of the number density in the ventilation zone (17), and the cutout holes are formed at the base edge portion. A paper diaper having a three-dimensional gather (7g) (7h) provided with a leakage prevention zone (18) in which the number density of each was about 1/10 of the number density in the ventilation portion was prepared. Such a paper diaper basically has a ventilation opening over the entire surface of the three-dimensional gather, so that the air permeability is further improved. However, the central part in the longitudinal direction of the disposable diaper where excrement accumulates most easily, that is, a three-dimensional In the central part in the gather longitudinal direction, if there is a relatively large amount of excrement, it may leak through the ventilation zone (17). Therefore, as in the present embodiment, only the central portion is a weak ventilation portion (22) with a slight sacrifice in air permeability, so that leakage from the central portion can be effectively prevented.
[0017]
Example 4
A paper diaper having a three-dimensional gather made of a nonwoven fabric similar to the conventional one and formed so as to gradually increase the opening made of a broken-line slit from the base end edge to the tip end edge was made.
Such a paper diaper has almost the same leakage prevention effect as the conventional product, but the air permeability is remarkably improved.
[0018]
(Example 5)
Paper diapers having the following three-dimensional gathers (7i) and (7j) were made using a sheet having a two-layer structure of a thin film plastic film and a nonwoven fabric. That is, the belt-like region along the edge of the tip is a ventilation zone (17) in which a large number of needle-like holes are formed, and the central portion in the longitudinal direction has a weak central ventilation portion in which the number density of needle-like holes is about 1/3. (22) was provided. Furthermore, the end weak ventilation part (23) which made the number density of the needle-like hole about 1/3 at the both ends of the longitudinal direction of the leak prevention zone | band (18) along the base end edge which has not performed hole processing further. Provided.
According to such a paper diaper, the air permeability is superior to the case of FIG. 6, and the base edge of the central portion in the longitudinal direction where excrement is most likely to collect is the most leak-proof among the three-dimensional gathered portions. The effect is high, and both end portions and upper portions thereof are weakly ventilated portions, so that they usually have air permeability, but leakage is extremely small even when wet with excrement.
[0019]
(Example 6)
In addition to the three-dimensional gathered structure as shown in FIG. 7, the number density of the needle holes between the ventilation zone (17) and the leakage prevention zone (18) is also reduced to 1/3 as shown in FIG. A paper diaper having a three-dimensional gather (7k) (7m) having a ventilation zone (21) was produced.
Such a paper diaper has a large number of openings as a whole of the three-dimensional gathers (7k) (7m), so that the air permeability is quite good, and the periphery of the central portion in the longitudinal direction of the leakage prevention zone (18) where excrement tends to accumulate is All are surrounded by weak ventilation, so even if excrement may wet the surroundings, the leakage will be very small.
[0020]
【The invention's effect】
In this way, with regard to the breathability of three-dimensional gathers, the distal edge that contacts the skin is enlarged and the proximal edge, which is the joint with the disposable diaper body, is reduced to prevent side leakage of excrement and stuffiness when worn. Both effects of prevention can be obtained simultaneously. Further, in the vicinity of the portion where excrement tends to accumulate, the leakage preventing effect is improved by sacrificing the air permeability slightly. Furthermore, if a breathable back sheet is used as the back sheet, the effect of eliminating stuffiness is further enhanced.
[Brief description of the drawings]
FIG. 1 shows a disposable diaper, wherein (a) is a plan view and (b) is a cross-sectional view taken along line AA ′ of (a).
FIG. 2 is a perspective view of the same.
FIG. 3 is a front view of a three-dimensional gather portion showing Reference Example 1 of the present invention.
FIG. 4 is an explanatory diagram showing a wearing state of a disposable diaper.
FIG. 5 is a front view of a three-dimensional gather portion showing Embodiment 2 of the present invention.
FIG. 6 is a front view of a three-dimensional gather portion showing Embodiment 3 of the present invention.
FIG. 7 is a front view of a three-dimensional gather portion showing Embodiment 5 of the present invention.
FIG. 8 is a front view of a three-dimensional gather portion showing Embodiment 6 of the present invention.

Claims (5)

A long main body in which an absorbent body is disposed between a liquid-permeable top sheet and a liquid-impervious back sheet, and base end edges along the left and right sides in the longitudinal direction of the liquid-permeable top sheet surface of the long main body. In a paper diaper having a fixed and at least three-dimensional gathers that stand up when worn, the base edge of the three-dimensional gathers is used as a leak-proof zone, and the leading edge is used as a ventilation zone. It is a paper diaper , and a part of the leakage prevention zone and / or a part of the ventilation zone is excellent in air permeability as a weak ventilation part having better air permeability than the leakage prevention zone and less air permeability than the ventilation zone. Paper diapers. Excellent diapers breathable of claim 1, wherein providing the weak aeration zone between the leakproof zone and venting zone. The disposable diaper with excellent air permeability according to claim 1 or 2, wherein a weak ventilation portion is provided at a central portion in a longitudinal direction of the ventilation zone and / or a weak ventilation portion is provided at both longitudinal ends of the leakage prevention zone. A large number of openings in the ventilation band and weak ventilation part, and further, or no opening in the leakage prevention band, and the number density or total opening area of each of the ventilation band, weak ventilation part and leakage prevention band The disposable diaper excellent in air permeability according to any one of claims 1 to 3 , wherein:
Ventilation zone ≧ Weak ventilation part> Leakage prevention zone The disposable diaper with excellent air permeability according to claim 4 , wherein the number density or total opening area of the openings is continuously changed from the ventilation zone to the leakage prevention zone.

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