JPH10314218A - Disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a leakage preventive effect of urine, feces or the like, improve the touch, and improve a wearing feeling by constituting barrier cuffs standing up from a diaper body upper surface of melt blown nonwoven fabric on which an average fiber diameter, water pressure resistance, longitudinal/lateral respective ductility, respective tearing strength and a Metsuke (weight/sq. unit area) are specified. SOLUTION: A diasper 1 has a pair of left and right barrier cuffs 6 and 6 extending in the diaper longitudinal direction on left and right both side part upper surfaces of a diaper main body 5 where a liquid absorptive core 4 is interposed between a liquid permeable surface sheet 2 and a liquid impermeable reverse sheet 3. The barrier cuffs 6 are composed of sheet members 13 joined to a diaper (1) upper surface, and inside parts 13D of the sheet members 13 stand up from the diaper (1) upper surface as the barrier cuffs 6. These sheet members 13 are constituted of melt blown nonwoven fabric composed of a thermoplastic resin having a Metsuke unit of 5 to 20 g/m<2> , and an average fiber diameter of its constituting fiber satisfies 4 to 10 μm, and its water pressure resistance is set not less than 200 μmAq, and longitudinal/lateral respective ductility is set not less than 60% and respective tearing strength is set not less than 140 g.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to disposable diapers,
More specifically, the present invention relates to a diaper having an improved wearing sensation, in which a slimy feeling is eliminated and a feeling of rough skin is eliminated.

[0002]

2. Description of the Related Art In order to prevent discharged urine, feces and the like from leaking from around a leg of a diaper, it is a well-known conventional means to provide an elastic member such as rubber on a diaper leg and tighten around the leg. And on top of that, the urine from around the legs,
It is also known to provide barrier cuffs having a propensity to stand on both left and right sides of the diaper main body in order to further prevent leakage of feces and the like. By the way, barrier cuffs up to now have been composed only of spunbonded nonwoven fabrics or composites of meltblown nonwoven fabrics with the spunbonded nonwoven fabrics. However, although the former is preferable in terms of cost and strength, since it is only the spunbonded nonwoven fabric, its water resistance is low, and its effect of preventing leakage from urine is low.
In addition, the nonwoven fabric has a feeling of ruggedness unique to the nonwoven fabric,
The texture is not desirable. The latter is intended to improve the leakage prevention effect by compounding the melt-blown nonwoven fabric, but in the case of a three-layer composite in which the meltblown nonwoven fabric is inserted between the front and back spunbonded nonwoven fabrics, The feeling still remains, and the feeling of wearing is not desirable. Also, when the melt-blown nonwoven fabric is combined with the spunbond nonwoven fabric with the front and back, the meltblown nonwoven fabric of ordinary fineness has a slimy feeling, and the sponge-bonded nonwoven fabric still has a feeling of gore, and its wearing feeling is still Not preferred. Also, in the latter configuration, considering that the object is a disposable diaper, it is a major issue to reduce the production cost as much as possible, and it is not possible to increase the production cost for the composite configuration. Not a good thing.

[0003]

Accordingly, an object of the present invention is to provide a disposable diaper which solves the above-mentioned problems. That is, an object of the present invention is to provide not only an excellent effect of preventing leakage of urine and feces, but also a better texture, an excellent wearing feeling, and a reduction in the manufacturing cost thereof, a diaper having a barrier cuff and suitable for disposable use. Is to be provided.

[0004]

DISCLOSURE OF THE INVENTION In view of the above-mentioned inconveniences, the present inventors have developed a melt-blown non-woven fabric as a diaper barrier cuff material, in which the constituent fibers of the melt-blown non-woven fabric have a larger single-fiber fineness and a non-woven fabric. As a result, the inventors of the present invention have made intensive studies based on the view that if the toughness can be made higher, it is not necessary to use a spunbonded nonwoven fabric in combination, and the texture can be improved. Reached. That is, the present invention extends in the front-rear direction of the diaper main body on both left and right sides of the diaper main body in which a liquid-absorbing core is interposed between the liquid-permeable top sheet and the liquid-impermeable back sheet. And a disposable diaper having a barrier cuff having a propensity to stand up from the upper surface of the diaper main body, wherein the barrier cuff has an average fiber diameter of 4 to
5 to 2 masses each having a water resistance of 200 mmAq or more, a vertical and horizontal elongation of 60% or more, and a tear strength of 140 g or more.
A disposable diaper characterized by comprising a melt-blown nonwoven fabric of 0 g / m ² .

The present invention uses a melt-blown nonwoven fabric having a larger fiber diameter and a high tear strength as a barrier cuff as described above, whereby the slimy feeling is eliminated due to the fiber diameters of the constituent fibers, resulting in a smooth skin feel. In addition, since it is a single-piece structure, it does not have a feeling of stiffness, and because it is a melt-blown nonwoven fabric, it has excellent water resistance and breathability, it has a good feeling of wearing as a diaper, and its manufacturing cost Can also be reduced.

[0006] The nonwoven fabric can be stretched in one direction, for example, by stretching in one direction to the extent that it does not lead to breakage of the constituent fibers, and as a result, the tear strength can be increased. It is technically desirable and is not desirable for the subject of the present invention that seeks low cost. In the present invention, as a melt-blown nonwoven fabric constituting the barrier cuff, the strength in each of the vertical and horizontal directions is appropriately increased, and by increasing the elongation in each direction, the resulting tear strength is increased. is there. That is, a melt-blown nonwoven fabric having a high elongation and thus a high tear strength, which is obtained without requiring any special stretching means or the like in the production process of the nonwoven fabric, is used.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the drawings. FIG. 1 is an example of a so-called open type diaper, in which the diaper 1 is in an opened state and a part of the diaper 1 is cut away. The diaper 1 includes a diaper main body 5 having a liquid-absorbent core 4 interposed between a liquid-permeable top sheet 2 and a liquid-impervious back sheet 3, and a diaper front and rear on the upper surface on both left and right sides of the main body 5. And a pair of left and right barrier cuffs 6 extending in the direction. In the diaper main body 5, the top sheet 2 and the back sheet 3 extending from the peripheral edge of the liquid-absorbent core 4 are joined to each other at their extending portions. The longitudinal direction of the diaper body 5 has a front body 7 and a back body 8
And a crotch region 9 located between the body parts 7 and 8. The left and right side edges of the crotch region 9 are cut out in an arc shape. Back body 8
Tape fasteners 10 and 10 are attached to the left and right side edges of the front side of the front body 7, and the tape fasteners 10 and 10 are opened in the folded state shown in FIG. It is considered possible. At the edge of the back body 8 and both side edges of the crotch region 9, there are a waist elastic member 11 and leg elastic members 12, 12, respectively, and each elastic member 11, 12 is a topsheet. 2. It is attached to at least one of the inner surfaces of the back sheet 3 and the sheet member 13 described below in an extended state.

The barrier cuff 6 comprises a sheet member 13 joined to the upper surface of the diaper 1, and the outer shape of the outer portion 13 C and the front and rear ends 13 A, 13 B of the sheet member 13 are the same as the outer shape of the back sheet 3. It is. The outer portion 13C and the end portions 13A and 13B are joined to the top sheet 2 and / or the back sheet 3 with which they abut. In the sheet member 13, an inner portion 13 </ b> D located between the end portions 13 </ b> A and 13 </ b> B has an elastic member 14 extending in the front-rear direction, and is joined to both the top sheet 2 and the back sheet 3 in the crotch region 9. The barrier cuff 6 that does not need to be formed is formed. When the diaper 1 curves inward in the front-rear direction as shown in the figure, the cuff 6 tends to rise from the upper surface of the diaper 1 when the elastic member 14 contracts. Back sheet 3
The side edges of the crotch region 9 where the elastic member 12 and the sheet member 13 are joined are leg flaps 15, 15.
Close to the wearer's leg due to the shrinkage.

FIG. 2 is a sectional end view taken along line II of FIG. In the figure, an outer portion 13C of the sheet member 13 is joined to an outer portion of the top sheet 2 and an outer portion of the back sheet 3 by a hommelt adhesive or the like. An inner portion 13D of the sheet member 13 serves as a barrier cuff 6 and forms a pocket 16 that rises from the upper surface of the diaper 1 and that opens together with the topsheet 2 toward the inside of the diaper 1. Inside part 13
In D, the upper edge of the figure is folded so as to surround the elastic member 12. The sheet member 13 having such a configuration has a basis weight of 5-2.
It is composed of the following specific melt blown nonwoven fabric made of a thermoplastic synthetic resin of 0 g / m ² .

This melt blown nonwoven fabric has an average fiber diameter of the constituent fibers of 4 to 10 μm, a water pressure resistance of 200 mmAq or more, a vertical and horizontal elongation of 60% or more, and a tear strength of 140 g or more. Say. When the average fiber diameter of the constituent fibers is lower than the lower limit of the above range, it becomes equivalent to a conventional ordinary melt blown nonwoven fabric, so that it has a slimy feeling, and has a weak strength, so that it is practically possible to use the nonwoven fabric alone. Disappears. Exceeding the upper limit of the above range, when it becomes a higher fiber diameter, even if it is a melt blown non-woven fabric, the water resistance becomes low, it becomes unsuitable as a barrier material itself for seeking liquid resistance, and as in the case of spun bond This is unfavorable because it gives a feeling of rough feeling. This nonwoven fabric has a basis weight of 5
If it is less than g / m ² , it is too thin to lower the liquid resistance effect, and the strength becomes weak, which is not preferable.
Those exceeding ² are not preferable because they are too bulky. In addition, the melt blown nonwoven fabric of the present invention has a vertical and horizontal elongation of 60% or more and a tear strength of 140 g or more, which means that it can be practically broken by itself without using it together with other reinforcing sheet materials. No barrier cuff can be constructed.

The above-mentioned melt-blown non-woven fabric is not particularly limited in its synthetic resin material, and any conventional melt-blown non-woven fabric material can be used. Among them, polypropylene resin is particularly suitable as a barrier cuff material of the present invention because it is inexpensive as a general-purpose resin and has high hydrophobicity and excellent water resistance when formed into a nonwoven fabric.

As is well known, the melt blown method is a method in which a heated molten polymer is blown away (melt blow) while being thinned by high-speed heating jet air immediately after being discharged from a nozzle, and the formed fibers are conveyed on a conveyor such as a net. This is a manufacturing method in which a non-woven fabric is formed at a stretch by collecting on the top.However, in order to obtain the obtained non-woven fabric which satisfies the above-mentioned properties defined in the present invention, it is necessary to convert the molten polymer into fine fibers. To increase the stretching stress in the process as much as possible, that is, to increase the melt viscosity of the polymer, enhance the effect of the gas fluid that drives it, promote molecular orientation, and increase the cooling effect to achieve orientation. It is necessary to suppress relaxation and promote crystallization. Based on this idea, the present inventors, as one of the means, blow the secondary air (cooling air) at a temperature lower than the heating air temperature by 130 ° C. or more, particularly immediately after the injection with the heating injection air. This is achieved by performing more active cooling of the synthetic fibers, drawing (thinning) the fibers with as little fusion as possible, and collecting the fibers. In the melt blown nonwoven fabric of the present invention, it can be manufactured by the above method, after manufacturing the nonwoven fabric,
No further stretching by stretching means as described above is necessary.

[0013]

EXAMPLES Table 1 below shows the manufacturing conditions and physical properties of the melt blown nonwoven fabric used as the barrier cuff material of the diaper of the present invention. However, the present invention is not limited to the embodiment. MFR700 polypropylene resin was used as the nonwoven fabric resin in Examples and Comparative Examples. The single-hole nozzle diameter is 0.3 mm, the die temperature is 250 ° C,
The jet air (primary air) temperature was 250 ° C., and the discharge amount was adjusted so that the constituent single fibers had the fineness shown in Table 1. The cooling air (secondary air) temperature was 15 ° C.

[0014]

[Table 1]

The conditions for the measurement of the elongation in Table 1 were as follows: the measuring speed was 300 mm, and the chuck interval was 100 mm. The collected web was guided between an embossing roll and a flat roll heated to each temperature of 80 ° C., and embossed at a linear pressure of 35 kg and a speed of 10 m / min.

As shown in Table 1, the melt-blown nonwoven fabric for a diaper in the present embodiment is strong and can be used alone and has high elongation, and therefore has high tear strength, high water pressure resistance and good air permeability. And the nonwoven fabric alone can be used as a barrier cuff material.

[0017]

According to the disposable diaper of the present invention, the barrier cuff is made of a high-tear strength melt-blown non-woven fabric made of a single fiber having a large fineness. Therefore, the cuff can be constituted by the non-woven fabric alone and without slimy feeling. It is a diaper that can be made to have a smooth texture and no stiffness, has a feeling of wearing that cannot be obtained with conventional melt-blown nonwoven fabrics, and can be manufactured at a reduced cost. In addition, it goes without saying that the disposable diaper of the present invention can be applied not only to the open type diaper described above but also to a pants type diaper.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of a disposable diaper showing an example of the present invention.

FIG. 2 is a cutaway end view taken along line II of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disposable diaper of this invention 2 Liquid-permeable topsheet 3 Liquid-impermeable backsheet 4 Liquid-absorbent core 5 Diaper main body 6, 6 Barrier cuff 7 Diaper front body 8 Diaper back body 9 Inseam area 10, 10 Tape fastener 11 Waist elasticity Member 12, 12 Leg elastic member 13 Sheet member constituting barrier cuff 6 14 Elastic member 15 Leg flap 16 Opening pocket

Claims (1)

[Claims] 1. A diaper main body having a liquid-absorbent core interposed between a liquid-permeable top sheet and a liquid-impervious back sheet, and extends in the front-rear direction of the diaper main body, In a disposable diaper having a barrier cuff having a propensity to stand from the upper surface of the diaper main body, the barrier cuff has an average fiber diameter of 4 to 10 μm, a water pressure resistance of 200 mmAq or more, a vertical and horizontal elongation of 60% or more, and a tear strength of each. 140g or more,
Disposable diaper, characterized in that it is composed of basis weight 5 to 20 g / m ² melt blown nonwoven fabric.