JP2004298399A - Absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrict the generation of the tightening force concentrated on the human bodies. <P>SOLUTION: The absorbent article 100 is put on the body to the crotch from the waist line and has a moisture absorbing material at the position corresponding to the crotch. A sheet member 20 is arranged to cover the portion to the crotch from the waist line of the body in the wearing thereof while an elastic part 25 is provided to generate the force of holding the wearing onto the waist line of the sheet member 20. The elastic part 25 has a plurality of elastic members 25a and 25b of many kinds varied in the level of the elastic stress and the mix ratio in the layout of the elastic members 25a and 25b of many kinds varied in level is changed in the arrangement so that the wearing holding force reduce toward the under-belly part in the portion to the under-belly part from the waist line part of the sheet member 20. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an absorbent article.
[0002]
[Prior art]
A disposable brief as a conventional absorbent article includes a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber interposed therebetween. At the upper end of the waist portion of the back sheet and at the lower abdominal position below the elastic portion, there are provided elastic portions made of a plurality of thread rubbers, each of which generates a holding force on the human body. (For example, see Patent Document 1).
[0003]
Further, a disposable brief as another conventional absorbent article includes a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber interposed therebetween, as described above. An elastic portion made of a plurality of thread rubbers that generates a holding force on the human body is provided at an upper end of the waist portion of the back sheet and a lower abdomen position below the upper portion, and the elastic portion of the upper end portion of the waist portion is located at the lower abdomen position. The elastic force is set larger than the elastic part. (For example, see Patent Document 2).
[0004]
[Patent Document 1]
Japanese Patent No. 2690870 [Patent Document 2]
Japanese Patent No. 2833720 [0005]
[Problems to be solved by the invention]
However, in each of the above-mentioned conventional examples, since the elastic portion is strengthened at the waist portion, a tightening force is concentrated on the waist portion at the time of mounting, and a load is applied to the human body. There were inconveniences such as occurrence.
[0006]
An object of the present invention is to provide an absorbent article that reduces a burden on a human body at the time of wearing and has a gentle holding feeling and a holding power that is not different from the conventional one.
[0007]
[Means for Solving the Problems]
The invention according to claim 1 is an absorbent article that is mounted from the waist of the human body to the crotch and includes an absorber at a position corresponding to the crotch, and includes a sheet member that covers the crotch from the waist of the human body at the time of mounting. An elastic portion that generates a holding force on the waist is provided, and the elastic portion includes a plurality of elastic members, and the elastic stress decreases from the waist portion of the sheet member to the lower abdomen so that the mounting holding force decreases toward the lower abdomen. Are arranged so as to be changed.
[0008]
In the above configuration, the elastic portion is not formed separately at the waist portion and the lower abdomen portion of the sheet member as in the related art, but a plurality of elastic portions provided side by side over a wide range from the waist portion to the lower abdomen portion Since the holding force is generated by the member, the generation of the tightening force concentrated on a part of the human body can be reduced.
Furthermore, since the elastic portion is set so that the mounting holding force becomes smaller as going from the waist portion to the lower abdomen, the elastic portion as a whole maintains a high holding force, but the tightening force to the lower abdomen of the human body. Compression can be effectively avoided, and the burden on the human body can be reduced. For this reason, it becomes possible to effectively eliminate the tightening trace and itching of the waist and the lower abdomen of the human body.
[0009]
The invention according to claim 2 has the same configuration as the invention according to claim 1, and adopts a configuration in which the elastic portion is made of two or more types of elastic members having different levels of elastic stress.
That is, in the waist portion, the elastic member having a strong elastic stress is mainly disposed, and in the lower abdomen, mainly the elastic member having a low elastic stress is mainly disposed, so that the elastic portion has a moderate mounting holding force from the waist portion to the lower abdomen. Significant reduction is realized.
[0010]
The invention according to claim 3 has the same configuration as the invention according to claim 1 or 2, and the elastic portion is made of two kinds of elastic members having different strengths of elastic stress, and changes in the mixing arrangement ratio thereof. Thus, the elastic stress is changed so that the mounting holding force decreases from the waist to the lower abdomen.
That is, the elastic portion is set for each of the plurality of elastic members from the waist portion to the lower abdomen so that the closer to the lower abdominal portion, the higher the ratio of the elastic member having the lower elastic stress becomes. Thus, the elastic portion achieves a gradual decrease in the mounting holding force from the waist portion to the lower abdomen. Further, since the number of types of the elastic members is reduced, the productivity is effectively improved.
Note that the “mixing arrangement ratio” refers to the number ratio of various types of elastic bodies having different strengths when a plurality of elastic members arranged in a predetermined direction are divided into a predetermined number. .
[0011]
The invention according to claim 4 has the same configuration as the invention according to claim 1, 2, or 3, and further includes a configuration in which each elastic member is an annular rubber thread provided around the waist portion. I am taking it.
In the above configuration, the mounting holding force in the elastic portion is generated by the elastic stress of the plurality of annular thread rubbers. As described above, it is possible to improve the productivity by making each elastic member a thread rubber that is easily available.
[0012]
The invention according to claim 5 has the same configuration as the invention according to claim 4, and each thread rubber is provided with a difference in strength of elastic stress due to a difference in type, width, thickness, and sticking length. Has been adopted. In addition, "attached length" shall mean the difference of the length at the time of being attached to an absorbent article with respect to the natural length of thread rubber.
In the above configuration, since the material is thread rubber, a difference in strength of the mounting and holding force of each elastic member can be set by its thickness and width, and productivity is improved from the ease of such strength adjustment. .
[0013]
The invention according to claim 6 has the same configuration as the invention according to claim 1, 2, 3, 4 or 5, and the plurality of elastic members are arranged at equal intervals in the direction from the waistline to the crotch side. It has a configuration of being arranged.
In the above configuration, the elastic members are arranged at equal intervals so that the mounting and holding force is generated over the entire width of the elastic portion, thereby avoiding partial concentration of the mounting and holding force and effectively reducing the human body. To reduce the burden on
[0014]
The invention according to claim 7 has the same configuration as the invention according to claim 1, and the elastic portion continuously changes the elastic stress by changing the arrangement interval of each elastic member. That is, on the side of the elastic portion, the intervals between the elastic members are arranged to be dense, and the intervals between the elastic members are gradually reduced toward the lower abdomen.
Further, in the above configuration, it is possible to realize a continuous change in elastic stress by the same elastic member, to reduce the number of types of components, and to improve productivity.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
A pants-type disposable paper diaper 100 as an absorbent article according to an embodiment of the present invention will be described with reference to FIGS. 1 is a perspective view of the disposable diaper 100, FIG. 2 is an exploded view showing a front surface of a side (top sheet 10 side described later) in which both sides of the disposable diaper 100 are in contact with a human body, and FIG. It is sectional drawing which followed the -X line.
[0016]
(Overall composition of disposable diapers)
The disposable diaper 100 includes a back sheet 20 as a liquid-impervious sheet member that covers the inseam from the waist of the human body at the time of wearing, an elastic portion 25 that generates a holding force for mounting the back sheet 20, and a human body contact side of the back sheet 20. The liquid-permeable top sheet 10 is located between the back sheet 20 and the top sheet 10, and the absorber 30 absorbs moisture such as urine. A gather sheet 40 for preventing leakage, a waist circumference leakage prevention sheet 50 for preventing leakage at front and rear ends when the top sheet 10 is mounted, and a waterproof film 60 for preventing leakage on the back side when the top sheet 10 is mounted. It is configured.
[0017]
(Back sheet)
The back sheet 20 is formed in a bag shape as a whole, has an abdominal opening at its upper end, and has two leg openings at its lower part. The upper part is a cylindrical waist part 26 surrounding the human body when the diaper is worn, and the lower part is a cylindrical lower abdomen 27 surrounding the lower abdomen of the human body. The part between the parts is a crotch part 28. The waist 26, lower abdomen 27, and crotch 28 are integrally formed.
As shown in FIG. 2, the waist portion 26 and the lower abdomen 27 are divided into a front part and a rear part at both ends in a state before completion as shown in FIG. 2. A crotch 28 is interposed between the portions. That is, the back sheet 20 is formed in a substantially bag-like state by folding one sheet body at the crotch portion 28 and joining both side ends of the waist portion 26 and the lower abdomen portion 27.
[0018]
Further, the entire sheet body forming the back sheet 20 has a laminated structure of two nonwoven fabrics 21 and 22. These are all formed of a liquid-impermeable nonwoven fabric (sheet member). Thread rubbers 25a and 25b constituting the elastic portion 25 are interposed between the two nonwoven fabrics 21 and 22 in the waistline portion 26 and the lower abdomen 27 of the back sheet 20, and the nonwoven fabrics 21 and A thread rubber 23 is inserted between the two to fit the human body when worn.
The liquid-impervious nonwoven fabrics 21 and 22 may be made of any of the above materials such as polypropylene (PP), polyethylene (PE), nylon, polyester (PET, etc.), acryl and the like, and PE / PP mixed nonwoven fabric and PE / PET mixed nonwoven fabric. A bicomponent fiber (mixed fiber) or the like in combination is used as a material, but in order to be liquid-impermeable, it is desirable to use a material having high hydrophobicity or water repellency, or processing to increase hydrophobicity or water repellency. Is applied.
Further, in a state where the back sheet 20 is unfolded, the upper end and the lower end of the nonwoven fabric 22 are folded inward at the time of attachment, and the upper end and the lower end of the waist circumference leakage prevention sheet 50 bonded to the nonwoven fabric 21. And each part.
[0019]
(Elastic part)
The elastic portion 25 is composed of thread rubbers 25 a and 25 b as a plurality of elastic members provided side by side from the waistline portion 26 to the lower abdomen 27 of the backsheet 20. These thread rubbers 25a and 25b are divided into two at both ends before completion, similarly to the waist portion 26 and the lower abdomen 27 of the back sheet 20 described above, but the waist portion 26 and the lower abdomen 27 are separated. The thread rubbers 25a and 25b are connected to each other by being connected at both ends thereof, and each of them becomes annular.
[0020]
These thread rubbers 25a and 25b are fixed in a state of being inserted between the nonwoven fabrics 21 and 22 of the backsheet 20 while maintaining a parallel state, and at the same time from the waist 26 to the lower abdomen 27 of the backsheet 20. (Vertical direction in FIG. 12) at a uniform interval. The term "equal spacing" used herein means a state in which the center lines of the thread rubbers 25a and 25b in the width or thickness direction are equally spaced.
Further, the elasticity of the thread rubber 25a is set to be larger than that of the thread rubber 25b. These elastic stress differences may be set according to the difference in the thread rubber material itself, or may be set according to the difference in width, thickness, or sticking length in the cross section.
[0021]
In the elastic portion 25, the mixing arrangement ratio of the two types of thread rubbers 25a and 25b is gradually changed in the vertical direction so that the mounting holding force gradually decreases from the waistline portion 26 to the lower abdomen portion 27. ing. Here, the “mixing arrangement ratio” refers to the number ratio of various elastic members having different strengths contained therein when a plurality of elastic members arranged in a predetermined direction are divided into predetermined numbers.
Specifically, as shown in FIG. 4, five thread rubbers 25a having a high elastic stress and one thread rubber 25b having a low elastic stress are arranged in a ratio of five from the top (the waist portion 26 side) in order. The five lower thread rubbers 25a with high elastic stress and the two rubber rubbers 25b with low elastic stress are arranged in a ratio of two, and the five lower thread rubbers 25a have high elastic stress. Two rubbers 25a and three thread rubbers 25b having low elastic stress are arranged in a ratio of three. In this manner, by gradually changing the ratio of the thread rubbers 25a and 25b having a difference in strength, the mounting holding force is not gradually decreased but gradually decreases from the waistline portion 26 to the lower abdomen 27 of the elastic portion 25. Can be changed to.
[0022]
Each of the thread rubbers 25a and 25b is set to have a shorter overall length than the entire circumference of the waist portion 26 and the lower abdomen 27. Therefore, when the disposable diaper 100 is not mounted, the waist portion 26 and the lower abdomen 27 are in a bellows-like contraction state due to the elastic stress of the thread rubbers 25a and 25b.
[0023]
(Top sheet)
The topsheet 10 is affixed to the crotch 28 of the backsheet 20, which is the side facing the human body when worn. That is, as shown in FIG. 2, the top sheet 10 has a rectangular shape, and an end portion thereof is adhered, thereby enclosing the absorber 30 between the top sheet 10 and the back sheet 20. Further, the upper and lower ends of the top sheet 10 in FIG. 2 enter the gap between the waist circumference leakage prevention sheet 50 and the back sheet 20 described later.
[0024]
The top sheet 10 is a liquid-permeable non-woven fabric, and its material is a natural fiber such as cotton, cellulose (wood pulp), wool, or silk, or polypropylene (PP), polyethylene (PE), nylon, or polyester. Synthetic fibers such as synthetic fibers such as (PET etc.), acrylic etc., PE / PP mixed non-woven fabric, PE / PET mixed non-woven fabric etc. are used. Cotton should be blended when using either natural or synthetic fiber. Is desirable.
[0025]
(Absorber)
The absorber 30 is interposed between the backsheet 20 and the topsheet 10 as described above. When the disposable diaper 100 is used, it is provided to absorb water-like components such as urine, and as shown in FIG. 2, an absorbent material such as cotton or pulp, or a sheet-like base such as fiber or film. An absorbent part 31 formed by combining a material and a superabsorbent resin, and a packaging part 32 made of an absorbent nonwoven fabric or paper including the absorbent part 31 are provided.
[0026]
(Waterproof film)
As shown in the cross-sectional view of FIG. 3, the waterproof film 60 covers the surface of the absorber 30 on the back sheet 20 side, and encapsulates the absorber 30 with the absorber 30 sandwiched together with the top sheet 10. Further, both sides of the waterproof film 60 extend laterally more than both sides of the top sheet 10, and the gather sheets 40 are provided along both sides of the extended waterproof film 60.
The waterproof film 60 is formed of a resin such as PE. The waterproof film 60 is a porous film in which a gap is formed in a sheet, and is subjected to a hydrophobic process or a water-repellent process to function as a waterproof waterproof film.
[0027]
(Gather sheet)
The gather sheet 40 is provided along both sides of the waterproof film 60 extended from both sides of the top sheet 10 as described above, and is folded so as to overlap the top sheet 10 from the extended state. I have. A thread rubber 43 is provided along the folded front end of the gather sheet 40, and applies a predetermined elastic stress in the vertical direction in FIG. For this reason, the top sheet 10 is curved so as to be folded at the middle portion in the longitudinal direction, and accordingly, the gather sheet 40 is in a state of rising to the upper surface of the top sheet 10. The gather sheet 40 is provided in such a state, so that when moisture is discharged to the upper surface of the top sheet 10, leakage of the moisture to the outside from both sides of the top sheet 10 is effectively prevented.
[0028]
The gather sheet 40 is formed of an air-through nonwoven fabric manufactured by an air-through method using the same fibrous material as the top sheet 10. The air-through nonwoven fabric used in the present embodiment has a coarser fiber, a larger fiber diameter, and a softer property than a melt-blown nonwoven fabric.
[0029]
(Waist circumference prevention sheet)
As shown in FIG. 2, the waist circumference leakage prevention sheet 50 is a liquid-impermeable sheet that is fixed so as to cover substantially the entire side surface of the human body when worn on the waist portion 26 and the lower abdomen 27 of the back sheet 20. .
The waist circumference leakage prevention sheet 50 is a free end portion that is not fixed only at a portion that covers the upper and lower ends of the top sheet 10 in FIG. 2, and forms a pocket with the top sheet 10. With such a configuration, the waist circumference leakage prevention sheet 50 prevents urine and the like from leaking from the part around the front waist and the back waist of the wearer when the paper diaper 100 is used.
[0030]
(Effect of disposable diapers)
In the disposable diaper 100 having the above-described configuration, the elastic portion 25 is integrally provided from the waist portion 26 to the lower abdomen 27 instead of providing the elastic portion in a state where the waist portion 26 and the lower abdomen 27 of the back sheet 20 are separately separated. Since the holding force of the disposable diaper 100 is obtained by the elastic portion 25, the generation of the tightening force concentrated on the waist or lower abdomen of the human body can be reduced, and the burden on the human body can be reduced. It becomes.
Further, since the elastic portion 25 is set so that the mounting holding force becomes smaller from the waist portion 26 to the lower abdomen 27, the elastic portion 25 as a whole maintains a high holding force while lowering the lower abdomen of the human body. Thus, it is possible to effectively avoid the compression due to the tightening force on the body and reduce the burden on the human body.
Furthermore, since the change in the holding force from the waist to the lower abdomen is realized by the change in the mixing arrangement ratio of the two types of thread rubbers 25a and 25b having different strengths, the productivity can be improved by reducing the number of parts. It becomes possible to plan.
[0031]
(Other)
The elastic portion 25 realizes a change in the holding force from the waist portion to the lower abdomen by using two types of thread rubbers 25a and 25b having different strengths, but uses three or more types of elastic members (thread rubbers) having different strengths. You may implement | achieve by mixing arrangement | positioning. In this case, the change in the elastic stress between the elastic members can be further reduced, and the change in the mounting holding force from the waist portion to the lower abdomen can be made more gentle.
[0032]
In addition, the elastic portion 25 is arranged with a plurality of elastic members (thread rubber) having uniform elastic stress so that the interval between the elastic members is gradually widened from the waist portion to the lower abdomen, so that the elastic portion 25 is lower from the waist portion. A change in which the holding force on the abdomen becomes small may be realized. In this configuration, the same elastic member can be used, so that it is possible to improve the productivity by reducing the number of parts.
[0033]
【The invention's effect】
According to the present invention, since a plurality of elastic members provided so that the mounting holding force becomes smaller from the waist portion to the lower abdomen of the sheet member toward the lower abdomen, the mounting holding force is generated. It is possible to alleviate the generation of the tightening force, and thereby it is possible to effectively eliminate inconveniences such as the occurrence of tightening marks on the waist and lower abdomen of the human body and the occurrence of itching.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of a disposable diaper to which the present invention is applied.
FIG. 2 is a plan view showing a state in which the disposable diaper of FIG. 1 is cut open on both sides and opened.
FIG. 3 is a cross-sectional view of the disposable diaper of FIG. 2 taken along line XX.
[Explanation of symbols]
20 Back sheet (sheet member)
25 elastic parts 25a, 25b thread rubber (elastic member)
30 absorber 100 disposable paper diaper (absorbent article)

Claims (7)

An absorbent article that is attached from the waist of the human body to the inseam and includes an absorber at a position corresponding to the inseam,
A seat member for covering the crotch from around the torso of the human body at the time of attachment, and an elastic portion for generating a holding force on the torso around the torso is provided on the sheet member;
The elastic portion includes a plurality of elastic members, and is arranged by changing the elastic stress so that the mounting holding force decreases from the waist portion to the lower abdomen of the sheet member toward the lower abdomen. Absorbent articles. 2. The absorbent article according to claim 1, wherein the elastic portion is composed of two or more types of elastic members having different levels of elastic stress. 3. The elastic portion is made of two types of elastic members having different strengths of elastic stress, and changes the elastic stress so that the mounting holding force decreases from the waist portion to the lower abdomen due to a change in the mixing arrangement ratio thereof. The absorbent article according to claim 1, wherein the absorbent article is provided. 4. The absorbent article according to claim 1, wherein each of the elastic members is an annular thread rubber provided around the waist portion. 5. The absorbent article according to claim 4, wherein the thread rubber has a difference in elasticity due to a difference in type, width, thickness, and sticking length. 6. The absorbent article according to claim 1, wherein the plurality of elastic members are arranged at equal intervals in a direction from the waist portion to the crotch side. 2. The absorbent article according to claim 1, wherein the elastic portion changes the elastic stress continuously by changing an arrangement interval of each of the elastic members. 3.

Images