JPH0810287A - Front surface material for disposable absorbent product and disposable absorbent product having pocket structure - Google Patents

Abstract

PURPOSE:To suggest a front surface material for disposable absorbent products having Z-folded pocket gathering to prevent leakage of excrement beyond the gathering. CONSTITUTION:The pocket front surface material 4 is provided with an aperture 7 and both sides of this aperture 7 are folded to a Z form. Elastic stretching members 8 are arranged at the turnups to gather the turnups, by which the aperture 7 and the gathering 9 are raised and the pocket structure to house the excrement is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface material for use in absorbent products such as disposable diapers and adult incontinence pads. The present invention relates to a surface material having pocket gathers, a manufacturing method thereof, and an absorbent product using the surface material.

[0002]

2. Description of the Related Art A disposable diaper having a pocket structure has been developed by the present inventors.
JP-A-4-150853 and the like.

For example, in the diaper described in Japanese Patent Laid-Open No. 4-150853, an absorbent core is arranged between the front surface sheet and the back surface sheet. The surface sheet is composed of three sheets, one of which is a hydrophilic sheet and is attached to the upper surface of the absorbent core with substantially the same length as the absorbent core. ing. The other two sheets are composed of a hydrophobic sheet (pocket surface material and its lining material), and are attached on the hydrophilic sheet to cover the upper surface of the absorbent core body so that excrement becomes hydrophilic. A pocket for dropping excrement is provided in the central area of the hydrophobic sheet while preventing it from returning to the skin from the elastic sheet, and contracts so that the pocket stands up on both sides of the pocket. A stretchable elastic body that gives force is attached.

[0004]

In this diaper, a stretchable elastic body is sandwiched between a hydrophobic pocket surface material and a backing material and then bonded to form a pocket gather. Since a hot melt adhesive is used for sandwiching and adhering, it is necessary to attach a backing material to the pocket surface material. In the prior art, this backing material was formed from a material different from the pocket surface material. And when producing diapers, this lining material was unwound from a winding separate from the pocket surface material, and an elastic elastic body was bonded between the pocket surface material and the lining material while keeping the stretched state. If different materials are used, the number of materials and the number of winding stands increase, and therefore the bonding process of the pocket gathers becomes considerably complicated.

Further, the above diaper is characterized in that a pocket for accommodating excrement is provided in the central region of the hydrophobic sheet, but in the case of manufacturing this, the center of the pocket surface material is bored ( It must be cut out to form pockets. This boring wastes a considerable amount of pocket surface material and also requires complicated labor for processing the cut-out material.

As one of the measures to solve such problems, the central portion of the pocket surface material is cut so as to form a ridge portion and a valley portion by a cutting line which is substantially S-shaped in the longitudinal direction, and the two pieces are cut. A disposable diaper has been proposed in which the sheets are stacked to form a pocket space in the center of the surface material, and the valleys are folded back to a predetermined width at the valley bottoms, and the elastic body is sandwiched between the folded backs. (For example, Japanese Patent Laid-Open No. 5-2
See No. 85168, No. 5-345003, and No. 1-16443.

By the way, the diaper having such a pocket structure has a structure in which the opening area of the pocket for accommodating excrement is increased and the pocket gathers are attached to both ends of the pocket to raise both ends of the pocket (three-dimensional structure). Can reduce the risk of excrement leaking out from pocket gathers. That is, if the pocket opening is made large, it is possible to store the excrement in the pocket even when the excretion position is shifted, and prevent the excrement from leaking to the outside of the pocket gather. However, if the pocket is made larger, the hydrophilic sheet containing urine and the like directly contacts the skin through the opening of the pocket, so that the wearer often feels an uncomfortable feeling of wetting. Therefore, the smaller the pocket opening, the better in terms of reducing discomfort to the skin.

However, in the above-mentioned conventional device, the four areas of the pocket are covered with the hydrophobic pocket surface material for the purpose of preventing the excrement from returning from the hydrophilic sheet to the skin. When the position is displaced on the hydrophobic pocket surface material, excreted urine or loose feces tend to run on the pocket surface material and leak out from the edge of the surface material.

It is an object of the present invention to improve on such conventional diaper facings. That is, the present invention provides a surface material for a disposable absorbent product having an improved Z-folded pocket gather that prevents excrement from leaking over the pocket gather.

It is another object of the present invention to form a gather for preventing leakage without forming the backing material as a material different from the pocket surface material and continuously forming the same as the pocket surface material. Therefore, the amount of material used and the number of winding stands are reduced to simplify the bonding process of pocket gathers.

Another object of the present invention is to develop two sheet pieces formed by cutting the central portion of the surface material in the longitudinal direction by a cutting line having an S-shape, and one of them is ½ wavelength. The object of the present invention is to propose a surface material for disposable absorbent products, which can reduce the amount of surface material used by shifting the peaks and forming a pocket in the central part of the surface material by partially overlapping the peaks.

Still another object of the present invention is to easily and economically manufacture a surface material for a disposable absorbent product which has a pocket for storing excrement, reduces leakage and reduces discomfort to the skin. is there.

[0013]

In order to achieve the above object, the present invention is a surface material for a disposable absorbent product having a pocket for storing excrement, which is arranged in the central region in the width direction of the product. Hydrophilic sheet (center surface material),
The surface material is composed of two types of sheets, a hydrophobic sheet (pocket surface material) for forming pocket openings, which is disposed on the hydrophilic sheet. The pocket surface material has a pocket opening, and the pocket opening is located on the upper surface of the hydrophilic center surface material. In addition, a pocket gather portion formed by bending the pocket surface material in a Z shape on both sides in the width direction of the pocket opening and adhering a stretchable elastic body to the folded back is disposed. In addition, the pocket gather portion has a first portion adjacent to the pocket opening.
A flap, a second flap extending from the outer edge of the first flap and standing upright, a third flap that is bent from the outer edge of the second flap and appropriately extends in the outer direction, and the second flap A stretchable elastic body is adhered to the inside of the bag portion formed by the third flap and the third flap in an extended state, and the second flap is bent by the contracting force of the stretchable elastic body from the outer edge of the first flap and worn. It stands up to the person's body.

The surface material for absorbent products which is the object of the present invention is such that the hydrophobic pocket surface material unwound from the winding is bent into Z-shapes on both sides in the width direction, and the center of the hydrophobic pocket surface material is S-shaped. Cut along the cutting line, the first flap adjacent to the cutting line, the second flap extending upward from the outer edge of the first flap, and the second flap bent outward from the outer edge of the second flap A third flap, which appropriately extends in width, and an elastic elastic body are adhered in an extended state to the inside of a bag portion formed by the second flap and the third flap to hold the Z-fold structure, Unfold the two left and right sheet pieces cut by the letter-shaped cutting line, shift one of them by ½ wavelength and arrange them so that the peaks partially overlap each other, and the valleys face each other. Characterized by forming a pocket in the center It is.

[0015]

[Function] Since both ends in the width direction of the hydrophobic sheet (pocket surface material) are bent into a Z shape, and the elastic elastic body is bonded in an extended state in the folded back to obtain the pocket gather portion,
The material of the pocket gather lining member and the stand can be omitted. The hydrophilic surface sheet (center surface material) is arranged in the center region in the width direction, the hydrophobic sheets are arranged in both regions in the width direction, and the hydrophobic sheet has two peaks and troughs. Since the sheets are faced to each other and the peaks are partially overlapped with each other at the end and the pocket is formed at the center, excrement is dropped into the pocket. Since the hydrophobic surface sheet is further fixed on the hydrophilic surface sheet, since the hydrophobic surface sheets on the outer layers on both sides of the pocket opening prevent the reversion,
Excrets do not come into direct contact with the skin. The stretchable elastic body for forming pocket gathers is refracted from the outer edge of the first flap by the contracting force of the stretchable elastic body with respect to the second flap and stands up on the body side of the wearer, so that excreted urine or loose feces are pockets. It avoids running over the gathers and running over the pocket facing to leak out of the edges of the facing.

In the present specification, also in the embodiments described below, the hydrophilic sheet provided in the widthwise central portion of the absorbent product surface material is referred to as the center surface material, and the width of the product for providing the pocket is set. The hydrophobic sheets provided on both side regions in the direction are referred to as pocket surface materials.

[0017]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a developed plan view showing a disposable diaper using the surface material of the present invention, and FIG. 2 is a sectional view taken along the line AA in FIG.

Reference numeral 1 is a liquid-impermeable backing sheet, and 2 is an absorber. The back sheet 1 has an hourglass shape in which the center portion is constricted inward when viewed from a plane, and an hourglass-shaped absorber 2 having a smaller area than the back sheet is placed in the center portion, and crotch gathers are formed on both side edges thereof. Stretchable elastic bodies 6 are arranged, and these are integrally bonded to the pocket surface material arranged above as described later.

As shown in FIGS. 1 and 2, the surface material of the present invention is disposed in the widthwise central region of the diaper and has a hydrophilic sheet (center surface material) 3 having the same length as that of the absorber and the hydrophilic material. The surface material is composed of two types of sheets, a hydrophobic sheet (pocket surface material) 4 for forming pocket openings, which is arranged so as to overlap the property sheet.

The pocket surface material 4 has a pocket 7 in the center for containing excrement. This pocket is located on the upper surface of the hydrophilic center surface material 3. The pocket surface material 4 is formed by continuously bending portions on both sides in the width direction of the pocket into a Z shape, and the elastic member 8 is stretched in the folded back portion.
A pocket gather portion 9 formed by adhering and fixing in a stretched state is arranged.

The pocket gather portion 9 has a form in which three pocket surface materials are overlapped (see FIG. 2). That is, the first flap 10 adjacent to the pocket 7, the second flap 11 extending from the outer edge of the first flap and standing upright, and the second flap 11 bent from the outer edge of the second flap and appropriately extended in the outer direction. The third flaps 12 are projected, and these flaps are tilted toward the pocket side and their longitudinally opposed ends 9a are fixed to the front side and back side end flaps 13 and 14 with an adhesive to maintain their shape. A stretchable elastic body 8 is adhered inside the bag portion formed by the second flap 11 and the third flap 12 in a stretched state parallel to the longitudinal direction of the surface material. Therefore, the second flap bends from the outer edge of the first flap due to the contracting force of the elastic elastic body, and stands up on the wearer's body side (see FIG. 7).

The folding width W when the pocket surface material is folded in a Z shape is preferably about 5 to 15 mm. If the folding width is reduced, the amount of material used can be reduced. If the folding width is increased, the effect of preventing leakage of excrement obtained from the shape of the pocket gathers is enhanced, and thus the folding width is preferably large.

As shown in FIGS. 3 and 6, the pocket surface material 4 of the embodiment is formed by cutting a central region of a surface material which is produced by a manufacturing machine or winding into a substantially S-shape in the longitudinal direction. A sheet having two peaks and troughs obtained by cutting along the line 13 is faced to each other, and the peaks are arranged so as to partially overlap each other at the ends, and the troughs face each other at the center. A vertically long pocket 7 is formed for storing excrement.

In FIGS. 4 to 6, two sheet pieces formed by cutting along the S-shaped cutting line 13 as described above are developed, and one of them is shifted by a 1/2 cycle wavelength to form a peak. FIG. 7 is a process diagram for explaining a state in which the pockets are formed on the surface material 4 by arranging the parts on top of each other and arranging the valley parts to face each other. The peak-to-peak overlapping portion 14 of the pocket surface material 4 is bonded by an appropriate means such as a hot melt adhesive, heat sealing, or ultrasonic sealing.

The pocket surface material 4 shown in FIGS. 3 and 4 is
The pockets formed on the surface material of the pocket are folded so that both sides in the width direction of the pocket are folded in a Z shape, and while controlling the tension in the folded portion, the elastic elastic body 8 is bonded and fixed in an extended state to form the pocket. The gather 9 is formed. FIG. 5 is an enlarged view of portion C of FIG. It should be noted that when the surface material is fed out, a slight meandering occurs, so when the central area of the surface material is cut by the S-shaped cutting line 13,
It is preferable to cut at a position separated from the stretchable elastic body 8 by at least 5 to 10 mm.

In order to maintain the Z-shaped folded configuration,
The stretchable elastic body 8 is adhered to the inner side of the bag portion formed by the second flap 11 and the third flap 12 by intermittently applying a hot melt adhesive, and further, as shown in FIG.
As shown in (B), it is preferable that the root of the second flap 11 is adhered G to the third flap 12 by an appropriate means such as a hot melt adhesive, heat sealing, or ultrasonic sealing. In this way, the pocket gather portion 9 folded in the Z shape is formed.
Stands up due to the contracting force of the elastic body during use and changes into a Y-shaped cross-sectional shape.

[0027]

Other Embodiments FIG. 8 is an explanatory view showing another example of the surface material of the present invention in which the pocket 7 is formed by punching (die cutting) the central area of the surface material of the pocket. As already mentioned,
Pockets should be as small as possible in order to reduce the unpleasant feeling of wetness after urination. However, when the pocket becomes smaller, when the excretion position shifts onto the hydrophobic pocket surface material, excreted urine or loose feces tend to run on the pocket surface material and leak from the edge of the surface material. Is. Therefore, the pocket opening width essential to the present invention is set to 35 mm to 120 mm, preferably 50 mm to 100 mm. Figure 1 shows an opening width of 80m
FIG. 8 shows an example in which the opening width is 70 mm.

The opening length of the pocket needs to be adjusted to the excretion position of urine and feces. It is better to set it longer than the distance of the excretion position in consideration of the deviation of wearing the diaper. The opening length is 85% to 30%, preferably 75% to 50% of the total length of the diaper. Figure 8 shows a diaper with a total length of 480m.
In this example, the opening length is 335 mm (69.8%) with respect to m.

The opening position of the pocket with respect to the surface area of the diaper is not limited to that of the embodiment shown in FIG. 1, and the opening position can be set to be displaced in the front-back direction with respect to the longitudinal direction of the diaper as shown in FIG. . This is to cope with a slight difference in the urination position between men and women. In such a case, it can be appropriately dealt with as an incontinence pad for adults.

In the method of forming the pocket by die cutting the central region of the pocket surface material, the pocket has a wide opening 7a as shown in FIG. 9 (the pocket width at the urination position is partially widened). It is possible to have a form having a narrow portion 7b. Also, like the surface material shown in FIG.
Multiple pockets 7 (a) 7 for storing urine and feces separately
It is also possible to have a form having (b).

Further, in order to prevent leakage from the back and the abdomen, it is possible to dispose the center surface material 3 so as to be shorter than the entire length of the diaper. The one shown in FIG. 10 has a center surface material length of 420 mm for a total length of 480 mm for the diaper,
Center surface material width 190mm for diaper width 320mm
This is an example in which the thing is arranged at the substantially central position of the diaper surface area. The outer periphery of the rectangle that hangs around the four sides of the center surface material 3 of the pocket surface material 4 is adhered. Further, the inner side is, so to speak, lifted up from the non-bonded center surface material 3. When the number of pockets is two, the hatched portion between the holes is adhered to the center surface material. At this time, two sections of the surface area of the pocket surface material 4 which are lifted from the center surface material 3 are obtained.

As the liquid impermeable back sheet 1, for example, a polyethylene film, a water repellent non-woven fabric, a poly-laminated non-woven fabric or the like is used, and as the hydrophilic top sheet 3, a dry non-woven fabric, a perforated film or a hydrophobic film is used. A hydrophilic treated non-woven fabric of fibers or the like is used. The absorbent body 2 arranged between the two sheets is composed of two or more layers of absorbent fiber layers such as fluff pulp and rayon,
Usually, a water-permeable sheet made of a tissue paper, a dry pulp nonwoven fabric, or the like is arranged above and below the upper and lower absorbers. Super absorbent particles can be arranged between the layers. The super absorbent polymer particles referred to herein are generally known super absorbent polymer particles alone or a mixture of them with activated carbon, carboxymethyl cellulose, zeolite or the like. The shape of the absorber in this embodiment is an hourglass shape with the center constricted, but the planar shape may be formed as a substantially rectangular shape as a whole. As the hydrophobic surface sheet 4, a hydrophobic fiber nonwoven fabric, for example, a polypropylene spunbond nonwoven fabric material can be used.

As the stretchable elastic body 6 for forming the crotch gathers and the stretchable elastic body 8 for forming the pocket gathers, natural or synthetic thread-shaped or band-shaped rubber, urethane non-woven fabric, urethane foam or the like can be used.

[0034]

According to the present invention, since the pocket gather is formed by Z-folding the pocket surface material and arranging the stretchable elastic body in the folded back portion, unlike the conventional one, a backing material of Use can be omitted and the number of winding stands can be saved. Moreover, since the pocket gather of the present invention is reinforced by the material obtained by continuously bending the pocket surface material, the material is not wasted.

The pocket gathers include a first flap adjacent to the pocket 7, a second flap extending from the outer edge of the first flap and standing upright, and a second flap bent from the outer edge of the second flap to the outer side. Since the third flap, which appropriately extends in the direction, stands up in a substantially Y shape when the pocket gather contracts, the Y-shaped standing portion serves as a partition to restrain the excrement even if it overflows from the pocket. Prevents leaks by overcoming gathers.

According to the manufacturing method of the present invention, the central portion of the surface material is cut in the longitudinal direction by a cutting line which is substantially S-shaped, and the first flap adjacent to the cutting line and the outside of the first flap. A second flap that extends upward from the edge and a third flap that bends from the outer edge of the second flap and extends appropriately in the outward direction.
A stretchable elastic body was adhered to the inside of the bag portion formed by the flap and the second flap and the third flap in an extended state to hold the folding structure, and then cut along the S-shaped cutting line. Unfold two sheet pieces on the left and right sides, shift one of them by ½ wavelength, and arrange them so that the crests partly overlap each other at their ends, and the valleys face each other to form a pocket in the central part. So, make a hole in the center of the surface material (cut out)
The amount of surface material used for the pocket can be reduced as compared with the case where the pocket is formed.

According to the one in which the hydrophilic center surface material is partially arranged as being shorter than the entire length of the diaper and the periphery of the pocket is covered with the hydrophobic pocket surface material (FIG. 10),
Excellent effect in preventing excrement from seeping out from the crotch, back and abdomen through the center surface material and reducing the reversion of excrement to the skin and the uncomfortable feeling of wetness after excretion due to the multilayer structure of the surface material. Is to have.

[Brief description of drawings]

FIG. 1 is a developed plan view showing an embodiment of an absorbent product (diaper) according to the present invention.

FIG. 2 is a cross-sectional view taken along the line AA in FIG.

FIG. 3 is an explanatory diagram of a process of Z-folding a pocket surface material.

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

FIG. 5 is an enlarged explanatory view of a portion C in FIG.

FIG. 6 is a view showing a sheet having two crests and a trough obtained by cutting the central area of the surface material in the longitudinal direction with a cutting line having an S-shape, and the crests at the ends. It is explanatory drawing of the process which arrange | positioned so that one part may overlap, and formed the vertically long pocket for accommodating excrement by making the valley parts face each other in the center.

FIG. 7 is an enlarged explanatory diagram of a portion D in FIG.

FIG. 8 is an explanatory view showing an example in which a pocket is formed by die cutting the central area of the surface material of the present invention.

FIG. 9 is an explanatory diagram of a pocket having a wide opening portion and a narrow opening portion.

FIG. 10 is an explanatory diagram in which pockets are provided at a plurality of positions.

[Explanation of symbols]

 1 Back Sheet 2 Absorber 3 Hydrophilic Surface Sheet (Center Surface Material) 4 Hydrophobic Surface Sheet (Pocket Surface Material) 6 Elastic Elastic Body for Crotch Gathering 7 Pocket 8 Elastic Elastic Body for Pocket Gathering 9 Pocket Gathering Part 10 1 flap 11 2nd flap 12 3rd flap 13 S-shaped cutting line

Claims (9)

[Claims] 1. A hydrophilic absorbent sheet (center surface material), which is a surface material for a disposable absorbent product having a pocket for storing excrement, the hydrophilic sheet being arranged in a central region in the width direction of the product.
The surface material is composed of two types of sheets, a hydrophobic sheet (pocket surface material) for forming pocket openings, which is disposed on the hydrophilic sheet, and the pocket surface material has pocket openings, and the pocket openings are A pocket gather portion which is located on the upper surface of the hydrophilic center surface material and which is formed by bending the pocket surface material in a Z shape on both sides in the width direction of the pocket opening and adhering an elastic elastic member in the folded back. And the pocket gather portion includes a first flap adjacent to the pocket opening, a second flap extending from an outer edge of the first flap and standing upright, and an outer edge of the second flap. A stretchable elastic body is adhered to the inside of a bag portion formed by the third flap that is bent and appropriately extends in the outward direction and the second flap and the third flap. It becomes the first in the second flap contractile force of the stretchable elastic member
A surface material for a disposable absorbent product that is bent from the outer edge of the flap and stands up against the wearer's body. 2. A hydrophobic pocket surface material unwound from winding is bent in a Z shape on both sides in the width direction, and the center of the hydrophobic pocket surface material is cut along an S-shaped cutting line to obtain the cutting line. A first flap adjacent to the first flap, a second flap that extends upward from an outer edge of the first flap, a third flap that bends from the outer edge of the second flap and appropriately extends in the outer direction, and After the elastic structure is adhered to the inside of the bag portion formed by the second flap and the third flap in a stretched state to hold the folding structure, the left and right sheets are cut along the S-shaped cutting line. Unfold one piece and
A method for producing a surface material for a disposable absorbent product, characterized in that two wavelengths are shifted and the peaks are arranged so as to partially overlap each other at their ends, and the valleys are opposed to each other to form a pocket in the central part. . 3. A disposable absorbent product in which a liquid absorber is fixed between a surface material according to claim 1 having a pocket and a liquid-impermeable backsheet. 4. The disposable absorbent product according to claim 3, wherein the pocket provided in the central area of the pocket surface material is a die-cut hole. 5. The pocket has an opening width of 35 to 120 m.
m, preferably 50 to 100 mm.
Or the disposable absorbent product described in 4 6. The length of the pocket opening is 8 of the total length of the diaper.
The disposable diaper according to claim 3 or 4, which is 5 to 30%, preferably 75 to 50%. 7. The disposable diaper according to claim 3, wherein the position of the pocket opening with respect to the surface area of the diaper is the center surface area in the width direction and the position is deviated from the center in the length direction. 8. The disposable diaper according to claim 3, wherein the pockets are provided at a plurality of positions. 9. The disposable diaper according to claim 3, wherein the pocket has a wide opening portion and a narrow opening portion.