JPS6399301A - Disposable diaper - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to disposable diapers, and in particular to structural means for effectively preventing body fluids absorbed into an absorbent body from leaking from the periphery of the absorbent body. The present invention relates to a disposable diaper characterized by the arrangement position of the elastic elastic member.

[Background of the invention]

Conventionally, various attempts have been made to prevent leakage of bodily fluids from the ends or sides of disposable diapers, sanitary napkins, etc., as described below, but each has its own drawbacks.

(1) Japanese Utility Model Application Publication No. 58-30421 The technology disclosed therein is a body fluid absorbent sheet consisting of a liquid-permeable sheet located on the upper surface of an absorbent body and a liquid-impermeable back sheet located on the lower surface of the absorbent body. In the article, one end of a liquid-impermeable end sheet having an appropriate length and width is interposed between the two sheets at both longitudinal ends of the article, and the other end of the end sheet is joined together. It is placed on the absorbent body.

However, in order to intermittently interpose a liquid-permeable end sheet, which is a material different from the liquid-impermeable back sheet and the liquid-permeable sheet, at both ends of the absorbent article in the longitudinal direction, it is necessary to There are the following difficulties in high-speed mass production.

That is, (1) it is difficult to intermittently feed the liquid-impermeable end sheet to a predetermined position between the two sheets while synchronizing the feeding speed of the two sheets that are fed at high speed;
(2) The liquid-impermeable end sheet is likely to come off the prescribed position, and (2) In addition, in order to join the liquid-impermeable end sheet between the two sheets, an adhesive supply device or welding of the end sheet is required. It requires a device to do this, which is also economically disadvantageous.

■Also, although the above-mentioned publication discloses a technique for welding liquid-impermeable end sheets, there is a problem in that it takes a certain amount of time to weld the end sheets, making high-speed mass production of absorbent articles difficult. .

(2) Utility Model Publication No. 60-306 The technology disclosed therein provides a disposable diaper comprising a liquid-permeable sheet, a liquid-impermeable sheet, and an absorbent body interposed between the two sheets. It is characterized in that the longitudinal ends of the sheet are integrally joined by a hydrophobic adhesive layer applied in a horizontally continuous strip between these ends.

Although this technique is improved over the technique disclosed in the above-mentioned publication in that a separate liquid-impermeable end sheet is not used, it still has the following drawbacks.

■If an infant excretes a large amount of urine or feces while lying on their back for a long period of time, such as at night, the effect of preventing leakage from the back may be insufficient and leakage may occur.

■It is not effective in preventing the leakage of excrement from the side of the waist of infants who are lying down.

etc.

(3) It is well known that elastic bands are provided on both sides of an absorbent article as a means of preventing leakage from both sides in the longitudinal direction of the absorbent article; JP-A-54-159041 attempts to prevent side leakage by covering a portion of the tube with a liquid-impermeable strip.

The drawbacks of the disclosed technology are as follows.

■Vertical leakage occurs from the short sides of the absorbent article.

■For horizontal leakage from both longitudinal sides of absorbent articles,
Although impermeable strips are applied to both sides, the fit around the infant's legs is inadequate, and the effect of preventing side leakage is insufficient and may result in leakage. Some devices have been used to provide a better fit to the skin part by stretching the strip, but since the strip is placed on the absorbent body of the absorbent article, the elasticity is relaxed and the burden on the bulge area is small. The fit is inadequate and may leak during initial urination.

There are some points that should be improved.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an absorbent article that effectively prevents edge leakage and side leakage of disposable diapers found in the above-mentioned prior art, and that facilitates high-speed mass production of the absorbent article. Our goal is to provide the following.

[Means for solving problems]

The above object is a disposable diaper having a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorbent body interposed between the two sheets, and elastic stretchable members arranged on both sides of the absorbent body; On the surface on the absorber side, the surface in contact with the surface sheet of the hot melt thin film laminated in the area extending from the inside to the outside beyond the periphery of the absorber, leaving a non-existing part inside the entire periphery of the absorber, The hot-melt thin film is integrally melt-impregnated with the top sheet over a part or all of the area and extends outward beyond the periphery of the absorbent body, and is fused to the back sheet, and further,
This is achieved by the elastic stretchable member extending in the longitudinal direction outside both edges of the true melt thin film.

[Effect]

In the present invention, the Honmelt W film is extended outward in all four directions from the entire periphery of the absorbent body, and the extended portion is fused to the liquid-impermeable back sheet, so that it can be absorbed into the absorbent body. Urine that has been drained will not leak from either the front or back or both sides.

In particular, since the hot-melt thin film is melt-impregnated into a liquid-permeable top sheet, urine will not diffuse along the surface of the top sheet.

On the other hand, since the hot-melt thin film has the function of bonding the top sheet and the back sheet, there is no need to provide a separate adhesive, which is advantageous in terms of material cost.

Moreover, once the position of the hot melt gun and the sheet position are determined, the hot melt thin film is always constant on the sides of the absorber, and the positioning of the hot melt gun and the timing of discharge are controlled for the front and back of the absorber. It is always constant and unlike the case where a sheet is interposed,
It is easy to form a stable and highly accurate hot-melt thin film for leakage prevention even on high-speed lines. Further, the hot melt thin film adheres to the absorbent body, and prevents the absorbent body from shifting against the top sheet, in other words, against the entire diaper.

On the other hand, in the present invention, when an elastic elastic member (hereinafter referred to as an elastic member) is provided to improve the fit around the legs, the member is provided outside both side edges of the hot melt 7ij membrane. As a result, even if lateral leakage cannot be prevented by the hot melt thin film, lateral leakage can be compensated for by the pressure contact around the legs by the elastic elastic member.

[Specific structure of the invention]

The present invention will be explained in more detail below.

Methods for laminating a hot melt thin film on the liquid-impermeable top sheet of the disposable diaper according to the present invention include, for example, laminating hot melt onto the top sheet, calender coating, extrusion coating, adhesion, single-sided impregnation, printing, etc. However, the present invention is not limited to these methods as long as the true melt does not appear on the opposite surface of the topsheet.

As the liquid-permeable surface sheet, a nonwoven fabric made of hydrophilic fibers such as rayon fibers, hydrophobic fibers such as polyester fibers, and nylon fibers by a wet method or a dry method can be used.

The basis weight of the surface sheet is 18g/m” to 35g/m
It is preferable to have a basis weight of 20 g/m or more in order to prevent the hot melt from coming out to the other side.

The hot melt is not particularly limited as long as it can be integrated into the liquid-permeable surface sheet. For example, daily gelatin H-6285 can be used.

In addition, the appearance of the product can be improved by using a colored hot melt mixed with an inorganic pigment.

The blending ratio of pigment is, for example, 0 to 100 parts of hot melt.
．． 1 to 1, and suitable pigment materials or a mixture thereof can be used as the pigment material. Furthermore, by using Hontomelt, which changes color when it comes into contact with body fluids such as urine, it is possible to visually see from the liquid-impermeable sheet side that body fluids have reached the longitudinal ends of the disposable diaper, making it easy to know when it is time to change the disposable diaper. It's convenient because I can do it.

The basis weight of the hot melt thin film is 20 to 60 g/m”
It is preferable to have a basis weight of 30 to 50 g/m''.

If it is less than 20 g/m 2 , small holes are likely to occur in the hot melt I film, and if it is more than 60 g/m 2 , the texture of the liquid-impermeable topsheet deteriorates, which is not preferable.

The stretchable elastic members placed on both sides of the absorber include synthetic rubber, natural rubber, foamed polyurethane, non-foamed polyurethane,
Any stretchable and elastic material such as stretchable hot melt may be used.

Further, the cross-sectional shape of the elastic member is generally circular, quadrilateral, etc., but is not limited thereto.

The number of elastic members is usually one on each side in the length direction of the absorber, but a plurality of elastic members may be used.

When a plurality of elastic members are provided, the stretch elasticity of each elastic member can be made different from each other, or the length at which each elastic member imparts the stretch elastic function to the paper diaper can be made to be different.

As the elastic member, in addition to those that are inherently elastic, those that exhibit elasticity when in contact with urine can be used.Furthermore, when placing the elastic member, an adhesive such as Honmelt may be used between the top sheet and the back sheet. Can be used.

The position of the elastic member is not particularly limited as long as it provides stretch elasticity to the leg area of the Gi diaper, but in order to compensate for side leakage due to the Honmelt thin film,
It is located outside the real melt thin film. If the elastic member is placed in a position where it comes into contact with the hot melt I film applied inside the top sheet, the elastic function of the elastic member will be reduced due to resistance from the hot melt thin film, the top sheet, and the back sheet. In addition, in a case where a composite sheet consisting of a hot melt thin film, a top sheet, and a back sheet are laminated in three layers to form the leg portion of a disposable diaper, the wind blowing around the infant's mouth may cause leakage. This is not preferable because it lowers the performance. A plastic sheet such as polyethylene can be suitably used as the liquid-impermeable back sheet.

Next, to explain the embodiment shown in the drawings, the disposable diaper shown in FIG. It consists of a body 3, stretchable elastic members 5 arranged at intervals from both sides of the absorbent body 3 in the longitudinal direction, and tape fasteners 7 attached to both sides near one end in the longitudinal direction of both the sheets. , on the inner surface of the permeable topsheet, near the periphery of the absorber excluding the substantial absorption openings 6, and in a region extending outward from the periphery of the absorber, one side is melted and impregnated with Honmelt 1 to melt and impregnate the surface. Impermeability is imparted to the region of the sheet, and as can be seen from FIGS. 2 and 3, a portion of the hot melt thin film 1 that is not impregnated is left on the inner surface of the permeable top sheet 2. Due to the adhesive properties of the unimpregnated hot melt thin film 1, a permeable top sheet 2 is integrally joined to the vicinity of the periphery of the absorber 3 and to the impermeable back sheet 4 outside the periphery of the absorber. .

In the diapers shown in FIGS. 1 to 3, when body fluids such as urine are discharged, they pass through the permeable top sheet and are absorbed into the absorbent body 3. Now, if we consider the case where the diaper wearer is lying on his back, if the number of body fluid discharges overlaps and the body fluid accumulates in the absorbent body, it will reach the longitudinal end of the absorbent body 3. However, as shown in FIG. 2, body fluid accumulates in the bag formed by the region near the longitudinal end of the top sheet 2 which is given liquid permeability and the impermeable back sheet 4. leakage can be prevented.

Width W of the impermeable region near the longitudinal end of the topsheet,
and Wt is preferably 50 to 100 mm. If it is less than 50 mm, the longitudinal ends of the absorber will not be covered sufficiently by the impermeable region, and if it is more than 100+ nm, the liquid absorption area of the absorber will decrease, which is not preferable. The width W3 of the impermeable region that covers the end of the absorbent body by the width W1 or W2 of the impermeable region must be at least 51. In addition, WI and W! The widths of the diapers do not necessarily need to be the same, and may be made larger, for example, Wt-tw, in adult disposable diapers that are often used in a supine position.

Furthermore, even if body fluids reach the ends of the absorbent body in the short side direction when the diaper wearer is lying down, the area provided with impermeability in the longitudinal direction of the top sheet 2 as shown in FIG. Since bodily fluids are accumulated in the bag formed with the impermeable back sheet 4, leakage of bodily fluids can also be prevented. The width W4 of the region imparted with impermeability in the longitudinal direction of the topsheet is preferably 5 to 30 mm. The reason why W4 is made smaller than W is that if the regions on both sides in the longitudinal direction of the absorbent body are covered with too many impermeable regions, the rate of decrease in the absorption area will increase, which will actually encourage leakage of body fluids. . The length W of the absorber covered by the impermeable region of the top sheet is preferably 3 to 25 mm.

Furthermore, in the disposable diaper of the above example, since the stretchable elastic members are arranged on both sides of the absorber in the longitudinal direction at a constant interval from the absorber, bodily fluids overflowing from both sides of the absorber in the longitudinal direction,
It is possible to prevent a portion of the body fluid that was initially excreted from being completely absorbed into the absorber and flowed out onto the top sheet from leaking out of the diaper.

As described above, it is possible to effectively prevent leakage of body fluids from the front and back and from both sides. In addition, if the hot melt thin film covering the absorbent body is fused to the absorbent body, it is possible to prevent the absorbent body from shifting. Fig. 4 shows another example of the diaper structure of the present invention.

In this diaper, the longitudinal edge of the impermeable region formed by the hot melt 1 impregnated into the topsheet 2 is located inside the longitudinal edge of the topsheet 2 or the backsheet 4, so that it is substantially The amount of hot melt required is reduced, and the sticky hot melt does not protrude from the longitudinal edges of the top sheet 2 and back sheet 4. In this diaper, the amount of hot melt used is small, so it is not only economical, but also eliminates the possibility that the hot melt protruding from the edges of both sheets will come into contact with the diaper wearer's skin and cause discomfort. Can be done.

The effect of preventing leakage of body fluids is equivalent to that of the diaper shown in the above example.

The width W6 between the longitudinal edge of the impermeable region by hot melt and the longitudinal edge of the top sheet or back sheet is 5 to 20. lI is preferred. If it is set to 5 mm or less, if the basis weight of the hot melt thin film is increased to nearly 60 g/m'', the real melt may protrude from the edges of both sheets, which is not preferable.
This is because if it is greater than fi, body fluids accumulated at the lengthwise ends of the absorbent body may ooze out from between the phototomel membrane and the back sheet.

Particularly when the diaper wearer is lying on their back, the weight of the diaper wearer is applied to the longitudinal ends of the absorbent body, which is undesirable because body fluids tend to bleed. Therefore, the width W of the impermeable region covering the longitudinal end of the absorbent body,
is preferably 55 to 95+y++n.

FIG. 6 shows another embodiment of the ° shape of the absorption opening surrounded by the impermeable region of the top sheet made of true melt.
The impermeable region covers the vicinity of the outer edge of the absorber, the minimum width W1'' of the impermeable region covering the longitudinal end of the absorber is 50 to 100 mm, and both sides of the absorber in the longitudinal direction The minimum width W4 of the impermeable region that covers is 5 to 30
As long as it is mm, it is not limited to this.

〔Example〕

Next, examples will be shown.

(Example 1) Gi diapers shown in FIGS. 1 to 3 were manufactured. In this case, the real melt is rH-628 manufactured by Hita Gelatin Co., Ltd.
5J, wax was used as a dispersant, and phthalocyanine pur C11Vh74160. manufactured by Toyo Ink Co., Ltd. was used as a pigment. White manufactured by Ibaraki Resino Co., Ltd. was added. The blending composition in this case was 0.3 parts of blue and 0.2 parts of white with respect to 100 parts by weight of Honmelt.

The hot melt was applied to a surface sheet with a basis weight of 24 g/m" with a basis weight of 130 g/m", and elastic members were attached to the outside of the side edges of the hot melt, 2 pieces per side, 4 in total.
I bought a book and got paper diapers.

When a number of products were examined for leakage from the front and back and from the sides of the obtained disposable diapers, no leakage occurred in any of them.

(Example 2) As the hot melt, a hot melt adhesive "Nicomelt ACH-IJ" manufactured by Malcolm Nicol & Company, Inc. (USA) was used to obtain the paper diapers shown in FIGS. 4 and 5.

It was found that when the absorbent material of this paper diaper becomes wet due to urine absorption, the color changes from yellow to blue, and urine absorption can be clearly identified.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to reliably prevent urine from leaking back and forth and sideways.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the used side of 1 diaper according to the present invention;
The figure is a view taken along line nn in Figure 1, and Figure 3 is a view from ■ to ■ in Figure 1.
4 is a plan view of another diaper according to the present invention on the use side, FIG. 5 is a view taken along the TV-TV line of FIG. FIG. 7 is a diagram illustrating another aspect of the shape of an absorption opening surrounded by a region. 1...Hot melt (thin film) 2...Top sheet 3...Absorber 4...Back sheet 5...Elastic elastic member Figure 1 Figure 3 Figure 2 Procedure main Hoshosho (spontaneous) May 11, 1985 Patent Application No. 241093 2, Name of the invention Disposable diapers 3, Relationship with the person making the amendment case Patent applicant address name Daio Seigi Co., Ltd. 4, Agent ■101 6. Specification subject to amendment, Detailed explanation of the invention column (1) On page 9, line 7 of the specification, "daily gelatin" is corrected to "Nitden gelatin." (2) On page 17, line 5 of the same book, "Hita Gelatin" is corrected to "Nitta Gelatin."

Claims (2)

[Claims] (1) In a disposable diaper having a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorbent body interposed between the two sheets, and elastic stretchable members arranged on both sides of the absorbent body; Absorption of the top sheet On the body side surface, the surface in contact with the surface sheet of the hot melt thin film laminated in the area extending outward from the inside beyond the periphery of the absorber, leaving a non-existing part inside the entire periphery of the absorber, is the area The hot-melt thin film is melt-impregnated and integrated with the top sheet over a part or all of the absorber, and extends outward beyond the periphery of the absorber, and is fused to the back sheet, and A disposable diaper characterized in that the elastic stretchable member extends in the longitudinal direction outside both edges of the hot melt thin film. (2) The disposable diaper according to item 1, wherein there is a plurality of elastic stretchable members.