JP4014470B2 - Disposable diapers - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disposable diaper that is excellent in wearability, can prevent a drop in leakproof performance and a sense of incongruity due to a mounting mistake, and can reliably exhibit excellent leakproof performance.
[0002]
[Prior art and problems to be solved by the invention]
Conventionally, there has been known a disposable diaper in which separate absorbent bodies are provided on both sides of the absorbent body in the crotch part, and when worn, the absorbent bodies on both sides bend downward and are arranged along the inner surface of the wearer's thigh Yes.
In this type of disposable diaper, excrement leaked laterally beyond the wearer's buttocks can be absorbed by the absorbent bodies on both sides, but the fit to the inner side of the thigh is poor, so the buttocks Excrements such as urine and loose stool that leaked to the side beyond the distance may leak from the legs without being absorbed by the absorbers on both sides.
[0003]
Japanese Patent Laid-Open No. 2001-346830 discloses a leg part elastic member along a longitudinal direction of a diaper in a region where a second absorbent body is arranged outside both side edges of a central absorbent body and the second absorbent body is disposed. Disposable diapers having a structure are described.
In this disposable diaper, the fit to the thigh side is improved and the leakage prevention effect is greatly improved, but the crotch width tends to be wider compared to general disposable diapers, so further wearing There was a need for improvement in sex.
[0004]
Accordingly, an object of the present invention is to provide a disposable diaper that is excellent in wearability, can prevent deterioration in leakproof performance due to mounting mistakes and can prevent a sense of incongruity, and can reliably exhibit excellent leakproof performance.
[0005]
[Means for Solving the Problems]
The present invention includes a liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-retaining absorbent body, and a disposable diaper formed substantially vertically in the diaper width direction from the side edge of the absorbent body. The absorber is folded at a position spaced a predetermined distance on the inner side so that the surfaces on the inner surface side of the diaper face each other, and has a folded back fixing portion to which a fixing means is applied so that the state is maintained. And a first elastic member is disposed in a longitudinal direction of the region in a region located on the outer side in the diaper width direction than the position of the folded fixing portion and on the inner side in the diaper width direction from the side edge of the absorber. A second elastic member is disposed along the longitudinal direction of the leg flap portion on the leg flap portion located on the outer side in the diaper width direction than the side edge of the absorber, and the leg flap portion Longitudinal contraction of Is larger than the contraction rate in the longitudinal direction of the region where the first elastic member is disposed, and the side edge of the absorber protrudes toward the center in the width direction of the diaper in a natural state diaper. The absorber has a low rigidity region in a region on the outer side in the diaper width direction than the folded fixing portion including a portion where the folded fixing portion is present, and the low rigidity region is The first elastic member has a lower rigidity than portions located on both sides of the low rigidity region in the diaper width direction, and the first elastic member is disposed on the outer side in the diaper width direction than the position of the low rigidity region. The above object is achieved by providing a disposable diaper.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on preferred embodiments thereof.
The disposable diaper 1 of the present embodiment is an unfolded diaper for adults. As shown in FIGS. 1 to 3, a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and both the sheets 2. 3 is provided with a liquid-retaining absorbent 4 interposed between the three, and is substantially vertically formed, and is fastened to both side edges of the back side portion A disposed on the wearer's back side when worn. Fastening tape 5 is provided as a means, and landing tape 51 is provided on the outer surface of the abdominal side portion B arranged on the abdomen side of the wearer when worn as fastening means for fastening these fastening tapes 5. It has been.
[0007]
More specifically, the diaper 1 of the present embodiment has an hourglass shape in which the central shape of the diaper 1 in the longitudinal direction is narrowed. The absorber 4 has a substantially rectangular shape, and a rectangular surface sheet 2 is arranged on the inner surface side, and a back sheet 3 having the same shape as the outer shape of the diaper is disposed on the outer surface side. It is arranged. Both side edges of the top sheet 2 are located slightly outward along the both side edges of the absorbent body 4, and the hydrophobic sheet material 6 is arranged so as to straddle the top sheet 2 and the back sheet 3, It is joined on both sheets 2 and 3. 1 and 3, the boundary line between the top sheet 2 and the sheet material 6 is not shown.
[0008]
Thus, the diaper 1 of the present embodiment has a surface on the inner surface side of the diaper at a position spaced a predetermined distance from the side edge 41 of the absorber 4 to the inner side in the diaper width direction (the center side in the width direction). Folded fixing portions 7 and 7 are provided which are bent so as to oppose each other and are fixed so that the state is maintained. In addition, a plurality of regions S located on the outer side in the diaper width direction with respect to the left and right folded fixing portions 7 and located on the inner side in the diaper width direction with respect to both side edges 41 of the absorbent body 4 are arranged along the longitudinal direction of the region S. Elastic members (first elastic members) 11 are arranged substantially parallel to each other.
[0009]
In order to maintain the folded state of the absorbent body that is folded so that the surfaces on the inner surface side of the diaper face each other, the folded back fixing portion is provided with fixing means, and the same constituent material of the diaper, such as the topsheets, the absorbent bodies, etc. It is the part which couple | bonded mutually or between different components. Examples of the fixing means include an adhesive, heat fusion, and stitching. The elastic member 11 is preferably disposed at a length that exceeds at least the entire length of the folded back fixing portion 7.
As shown in FIG. 2, the folded and fixed portion 7 in the diaper 1 of the present embodiment bends the absorbent body 4 together with the surface sheet 2, and faces the opposite surfaces of the absorbent body 4 on the diaper inside facing each other. It is formed by bonding with an adhesive 71 as a fixing means in a state where the sheet 2 is sandwiched. The adhesive 71 passes through the surface sheet 2 made of a fiber material, reaches the opposite surfaces of the absorbent body 4, and bonds the both surfaces.
[0010]
In the folded-back fixing portion 7 or in the vicinity thereof, the absorber is structured to be difficult to contract in the longitudinal direction due to the adhesion between the absorbers. Therefore, when the elastic member 11 disposed in the outer region S contracts, the absorber is absorbed. The side edge 41 of the body 4 and thus the side edge of the crotch part of the diaper is curved so as to protrude toward the center side in the diaper width direction with the folded back fixing part 7 as an axis, and the region S bends downward. Or easily bent. In the natural state, the portion of the absorbent body 4 positioned at the folded back fixing portion 7 or the portion positioned outside the folded back fixed portion in the diaper width direction is the folding direction of the absorbent body at the folded back fixed portion 7 (diaper It is bent in the opposite direction to the direction in which the inner surface faces face each other.
When the diaper is put on, the diaper is naturally in such a state. Therefore, the appropriate state in which the diaper is scheduled, that is, the region S is bent downward and is arranged along the inner surface of the thigh of the wearer. It can be easily and reliably mounted in an appropriate state. In particular, since the side edge of the absorbent body 4 in the vicinity of the folded-back fixing part 7 is curved so as to protrude toward the inside of the diaper and the crotch width is reduced, the side edge of the absorbent body and the thigh are rubbed during wearing. It is reduced, and a part of the diaper is not caught on a leg or the like, and can be worn smoothly.
[0011]
In addition, since the diaper can be easily and reliably attached to an appropriate state, it is possible to prevent inconvenience due to attachment mistakes, for example, deterioration of absorption performance, uncomfortable feeling, difficulty in hitting, etc. It is surely pressed against the inner side of the thigh, and leakage from both sides of the crotch C is reliably prevented.
[0012]
Moreover, since the cross-sectional shape in the width direction of the absorbent body 2 is an inverted Ω-shaped shape as shown in FIG. 2 before mounting, the auxiliary absorbent device is placed on the inner surface of the diaper and used in combination. The position fixability of the auxiliary absorber is improved. Furthermore, when the diaper is spread, the region sandwiched between the left and right folded fixing portions 7 and 7 is lifted upward, thereby improving the adhesion of the absorbent body (or auxiliary absorbent device) to the urine drainage portion and preventing leakage. The effect is improved.
[0013]
The form in which the absorbent body 4 is bent together with the top sheet 2 and the top sheets 2 are joined together to maintain the folded state of the absorbent body 4 is excellent in workability and manufactured without significant changes in conventional equipment. This is preferable in that it can be formed and because the pocket is formed to be large, the auxiliary absorbent device has good retention.
[0014]
The separation distance between the folded-back fixing portion 7 and the side edge 41 of the absorbent body 4 is such that a region S having a sufficient width is formed and the region S is pressed into contact with the inner surface of the thigh of the wearer with a sufficient area. From a viewpoint etc., it is preferable that it is 20-140 mm, especially 30-90 mm.
[0015]
In the right and left sides of the crotch part C in the diaper 1 of the present embodiment, the top sheet 2 or the sheet material 6 and the back sheet 3 extend outward in the diaper width direction from the side edges 41 of the absorbent body 4. A leg flap portion F is formed, and a plurality of thread-like elastic members (second elastic members) 12 are arranged in each leg flap portion F along the longitudinal direction thereof.
[0016]
The leg flap portion F has a large longitudinal shrinkage than the region S, in the natural state, the side edges 41 of the absorbent body 4 is curved convexly toward the diaper center side. Such a configuration is preferable from the viewpoint of wearability and fit.
Here, the contraction rate in the longitudinal direction of each of the leg flap portion F and the region S is measured as follows.
[0017]
(Measurement method of shrinkage)
First, the disposable diaper is in a tensioned state as shown in FIG. 3 (a state in which the elastic member of each part is extended and expanded in a flat shape), and in that state, on the outer edge of the leg flap F in the crotch C and the region S Two points are defined on the inner edge, and the shortest distance in the longitudinal direction between the two points is defined as a. Next, the tension state is released, and the shortest distance between the two points in a state where no external force is applied (natural state) is defined as b. The shrinkage rate is obtained from the following equation (1).
Shrinkage rate (%) = [(a−b) / a] × 100 (1)
The contraction rate of the outer edge of the leg flap portion F is defined as “the contraction rate in the longitudinal direction of the leg flap portion F”, and the contraction rate of the inner edge of the region S is defined as “the contraction rate in the longitudinal direction of the region S”.
The two points on the outer edge of the edge flap portion E and the inner edge of the leg absorption portion D are, as a general rule, when the disposable diaper 1 is divided into four regions so as to be divided into four equal parts in the longitudinal direction. It is taken on the boundary line between the inner two regions and the two outer regions. The ratio (Q / P) of the shrinkage rate Q of the leg flap portion F to the shrinkage rate P of the region S is preferably 1.1 to 3.0, particularly 1.3 to 2.0. The shrinkage rate of the leg flap portion F is preferably 20 to 70%, particularly preferably 30 to 60%, and the shrinkage rate P of the region S is preferably 5 to 55%, particularly preferably 15 to 45%.
[0018]
In the diaper 1 of this embodiment, the positions of both ends 71 and 72 of the folded fixing portions 7 in the longitudinal direction of the diaper are such that the fastening tapes 5 and 5 as fastening means and the diaper longitudinal of the landing tape 51 as fastening means They are spaced 50 mm or more from the positions of the end portions 5a and 51a near the center in the direction. That is, the distance L1 (see FIG. 3) between the position of the one end 71 of the folded and fixed portion 7 and the position of the end 5a of the fastening tape 5 is 50 mm when measured along the longitudinal direction of the tensioned diaper. The distance L2 (see FIG. 3) between the position of the other end 72 of the folded back fixing portion 7 and the position of the end 51a of the landing tape 51 is measured along the longitudinal direction of the diaper in the tension state. The measured value is 50 mm or more.
[0019]
By setting the distances L1 and L2 to 50 mm or more, it is possible to prevent the fixing means or the fixing means from entering the width direction, and it is possible to prevent the wearability from being deteriorated. Moreover, the to-be-fixed means does not wavy, and it is possible to prevent the fixing force from being lowered.
From the standpoint that the fastening means or the fastening means does not enter the width direction, and the friction between the absorber side edge and the thigh at the time of wearing is reduced and the wearing can be easily performed, etc., the distance L1 and the above The distances L2 are each preferably 50 to 250 mm, and more preferably 100 to 200 mm.
[0020]
Since the diaphragm in the diaper width direction is reliably formed, the length of the folded back fixing portion 7 (the length measured along the folded back fixed portion 7 is the distance between both ends 71 and 72 of the folded back fixed portion 7). It is preferable that it is -500 mm, especially 20-150 mm.
[0021]
The folded and fixed portion 7 is biased toward the abdominal side B when the disposable diaper 1 is divided into the back side A side and the abdominal side B side so as to divide the entire length (the total length in the tensioned state) into two equal parts. Exists in the position. More specifically, it exists only on the ventral side B side. By providing only on the ventral side and avoiding a large step on the back side, it is easy to place a large auxiliary absorber on the back side, making it easy to use a large auxiliary absorber together become. Moreover, the occurrence of bed slip can be prevented. Since resistance when pulling up the diaper occurs when pulling up the ventral side B, the resistance when pulling up can be reduced by narrowing only the ventral side. Further, by providing a step on the abdomen side, the fixability of the auxiliary absorbent tool for men, which has been easy to cause a deviation in the past, is improved.
[0022]
In the absorbent body 4, a low-rigidity region 42 is formed in a region on the outer side in the diaper width direction with respect to the folded fixing portion 7 including the portion where the folded fixed portion 7 exists, substantially parallel to the side edge of the absorber . Such a configuration is preferable from the viewpoint of improving the flexibility to the lower side of the absorber side edge and improving the wearability.
Such a low-rigidity region 42 is particularly preferably formed on the outer side in the diaper width direction with respect to the folded back fixing portion 7, but may be formed at a site where the folded back fixing portion 7 exists. As shown in FIG. 4, the site where the folded-back fixing portion 7 is present is a portion that is bonded by the fixing means in a state where the bonding portion by the fixing means in the folded-back fixing portion 7 is peeled off and the absorber 4 is spread flat. 73, 74 is a portion where the portion 74 on the outer side in the diaper width direction is located or its vicinity (indicated by 75 in FIG. 4).
In particular, it is preferable that the elastic member 11 exists outside the low-rigidity region 42 from the viewpoint of improving the fit around the legs.
[0023]
The method for forming the low-rigidity region is not particularly limited as long as the rigidity of a part of the absorber can be made lower than the rigidity of other parts. For example, (1) forming a region where the absorber does not exist, (2) setting a part of the absorber to a lower basis weight than other parts, and (3) making a part of the absorber thinner than other parts. (4) A part of the absorber is formed of a material having lower rigidity than other parts, (5) A narrow embossed line is provided along the longitudinal direction, (6) A slit is formed along the longitudinal direction. The method of putting in, the method of combining these 1 or 2 or more, etc. are mentioned.
[0024]
As shown in FIG. 5, the diaper 1 of the present embodiment is packed in a state in which both side portions of the absorbent body 4 are bent toward the inner surface of the diaper along its longitudinal direction and the bent portion 13 is compressed and compressed. Wrapped with packaging material. Specifically, with a pair of fold lines 14 extending in the longitudinal direction of the diaper as an axis, the portion located outside each fold line 14 is folded back inside (diaper inner surface side), and then the diaper is moved in the longitudinal direction three times. Fold or fold. And many diapers folded in such a compact form are laminated | stacked, and it packs with a packaging material (packaging bag etc.) in a compressed state. When packaging with a packaging material, compression is performed in a state in which a large number of diapers are stacked. At the time of compression, the bent portion 13 centering on the folding line 14 is compressed. The pressure compression of the bent portion 13 can be performed in a separate step prior to the compression step of stacking and compressing a large number.
[0025]
As shown in FIG. 4, the folding fixing portion 7 in the diaper 1 of the present embodiment is a portion that is separated from the folding line 14 when folding both sides of the absorber 4 (when folding) and is located on both sides of the folding line 14. It is formed by joining together with an adhesive. The adhesive is applied over the longitudinal direction with a predetermined width on the top sheet 2 located on both sides of the fold line 14 at a position spaced from the fold line 14 at the time of bending, for example.
[0026]
By connecting portions located on both sides of the folding line 14 used when folding the diaper, a liquid diffusion groove having a folding line as a bottom is formed near the front and rear ends of the folded fixing portion 7 in the longitudinal direction of the diaper. As a result, leakage prevention performance is improved.
[0027]
As shown in FIG. 6, the bent portion 13 of the absorbent body kept in the folded state has a tubular space (hereinafter also referred to as an absorbent tube) 43 surrounded by the absorbent body inside the folded direction. It is preferable to have. Since the absorber tube is substantially surrounded by the absorber, the liquid that has entered the inside is efficiently absorbed at high speed. In particular, the absorber tube has a shrinkage due to the elastic member 11 on the side, and thus has a pleat shape, and the surface area per unit length is increased, so that efficient high-speed absorption of the liquid is performed.
[0028]
The forming material of each part of the diaper 1 of the present embodiment will be described. As the forming material of the top sheet 2, the back sheet 3, the absorbent body 4, the fastening tape 5, the landing drape 51, and the hydrophobic sheet material 6, respectively. The various things used for a disposable diaper can be especially used without a restriction | limiting.
[0029]
Examples of the material for forming the elastic members 11 and 12 include natural rubber, synthetic rubber, spandex, and the like, and the form of each may be a thread, string, band, film, or the like. The elastic members 11 and 12 are preferably in the form of a thread, string, or belt from the viewpoint of shrinkability around the legs, workability, cost, and the like.
[0030]
The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit of the present invention.
For example, as shown in FIG. 7, the folded back fixing portion 7 is a portion in which the facing surfaces of the absorbent body folded so that the surfaces on the inner surface side of the diaper face each other are directly joined by a fixing means such as an adhesive. May be. This form has the advantage that the amount of the surface sheet used can be reduced and that the surface sheet is less likely to break when a lateral tensile force is applied.
The absorber 4 may be divided outward from the folded back fixing portion 7 in the diaper width direction. In this case, the side edge of the absorber is the outer edge of the absorber located at the outermost part, and the elastic member 11 is an absorber between the folded and fixed portion 7 and the outer edge of the absorber located at the outermost part. You may arrange | position in the part which does not exist.
Furthermore, the shape and size of each part in the diaper 1 of the above embodiment, the cross-sectional configuration, how to fold when packaging in a packaging material, the number of elastic members 11 and 12, and the like can be changed as appropriate.
[0031]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the disposable diaper which is excellent in mounting | wearing property, can prevent the fall of leak-proof performance by mounting | wearing mistake, and an uncomfortable feeling, and can express the outstanding leak-proof performance reliably can be provided.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a disposable diaper according to the present invention.
FIG. 2 is a cross-sectional view schematically showing an XX cross section of FIG. 1;
FIG. 3 is a plan view showing a state (tensed state) in which the disposable diaper of FIG. 1 is expanded in a planar shape.
FIG. 4 is a schematic cross-sectional view showing a state where a joint portion by a fixing means of a folded and fixed portion is peeled off.
FIG. 5 is a schematic cross-sectional view for explaining an example of how to fold the disposable diaper of FIG. 1;
FIG. 6 is a cross-sectional view showing an example in which an absorber tube is formed at a bent portion of the absorber. .
FIG. 7 is a cross-sectional view (a diagram corresponding to the right half of FIG. 2) showing a main part of another embodiment of the disposable diaper of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Top sheet 3 Back sheet 4 Absorber 41 Side edge 42 Low-rigid area 43 Absorber tube 5 Fastening tape (fastening means)
51 Landing tape (attachment means)
6 Hydrophobic sheet material 7 Folding fixing part 11 Elastic member (elastic member disposed in region S)
12 Elastic member (elastic member disposed on the leg flap)
S Area located outside the diaper width direction from the folded back fixing part and located inside the diaper width direction from the side edge of the absorbent body

Claims (5)

In a disposable diaper comprising a liquid-permeable top sheet, a liquid-impermeable back sheet and a liquid-retaining absorbent, and formed substantially vertically,
Fixing means is provided so that the absorber is bent so that the surfaces on the inner surface side of the diaper face each other at a position spaced a predetermined distance from the side edge of the absorber to the inside in the diaper width direction. It has a folded back part that has been applied,
A first elastic member is disposed in a longitudinal direction of the region in a region located on the outer side in the diaper width direction than the position of the folded fixing portion and located on the inner side in the diaper width direction than the side edge of the absorber. And
A second elastic member is disposed along the longitudinal direction of the leg flap portion on the leg flap portion located on the outer side in the diaper width direction than the side edge of the absorber.
The leg flap portion has a contraction rate in the longitudinal direction larger than the contraction rate in the longitudinal direction of the region in which the first elastic member is disposed, and the side edge of the absorber is in a natural state diaper, It is designed to curve convexly toward the center in the width direction of the diaper,
The absorbent body has a low rigidity region in a region outside the diaper width direction including the site where the folded fixing portion is present, and the low rigidity region is a region of the low rigidity region in the diaper width direction. It is made less rigid than the parts located on both sides,
The disposable diaper characterized in that the first elastic member is arranged on the outer side in the diaper width direction than the position of the low rigidity region . The bent portion of the absorbent body that is folded so that the surfaces on the inner surface side of the diaper are opposed to each other and the state of the folded portion is held by the fixing means is a tubular tube surrounded by the absorbent body on the inner side in the folding direction. The disposable diaper of Claim 1 which has the space of . The disposable diaper comprises fastening means on the back side and fastening means on the abdominal side, and the positions of both ends of the folded fixing part in the longitudinal direction of the diaper are determined by the fastening means and the fastening. The disposable diaper according to claim 1 or 2 , wherein the disposable diaper is spaced 50 mm or more from the position of the end portion of the means near the longitudinal center of the diaper. The folded anchoring portion, said disposable diaper, any claim 1-3 that exist only in the abdominal side portion when broken down in the rear section side and the ventral side portion to the entire length bisecting The disposable diaper described in Crab.   The disposable diaper is such that both side portions of the absorbent body are folded along the longitudinal direction toward the inner surface side of the diaper and the folded portion is packed in a compressed state. The disposable diaper according to any one of claims 1 to 4, wherein the disposable diaper is formed by joining portions located on both sides of the fold line apart from a fold line when the both side portions of the absorber are folded.

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