JP3998669B2 - Disposable diapers - Google Patents

Description

  [Technical Field] The present invention relates to a disposable diaper of a waistband type that can be worn by fixing one end portion in a longitudinal direction to a connected waistband portion after connecting the left and right waistband portions. .

  As a conventional disposable diaper, it has a liquid-permeable top sheet, a liquid-impermeable back sheet, and a liquid-retaining absorbent core interposed between both sheets, and waistband portions on both sides of the rear part in the longitudinal direction. A band fastening part is provided on at least one of the left and right waist band parts, and a flap part is provided on both sides of the front part in the longitudinal direction, and a diaper fastening part is provided on each flap part. There are known waistband type disposable diapers.

  This waistband type disposable diaper is designed so that the front part in the longitudinal direction can be fixed to the connected waistband part after the left and right waistband parts are connected around the torso. It has advantages such as excellent operability during mounting, particularly excellent operability when mounted while standing. Moreover, the diaper which made some waistband parts elastic in such a disposable diaper is proposed (refer patent document 1, 2 grade | etc.,).

Japanese Patent Laid-Open No. 9-154884 Japanese Patent Laid-Open No. 9-285489

  However, the conventional waistband type diaper has a large change in the shape of the leg hole that occurs during wearing due to individual differences in the circumference of the wearer's torso, especially around the waist, so depending on the body shape of the wearer There is a problem in that the fit around the legs is insufficient and leakage tends to occur. This was the same when a part of the waistband portion was made stretchable.

  Therefore, the object of the present invention is excellent in operability at the time of wearing, is highly adaptable to individual differences in the wearer's body shape, and can obtain excellent fit around the legs in a wide range of wearers. It is to provide disposable diapers.

  The present invention has an absorptive core, has waistband portions on both sides of the longitudinal rear portion, and has band fastening portions on at least one of the left and right waistband portions, and the longitudinal direction. Each of the front and rear portions has a flap portion, and each flap portion is provided with a diaper fastening portion. After the left and right waist band portions are connected by the band fastening portion, the diaper fastening portion The disposable diaper is configured so that the front portion can be fixedly worn on the waistband portion, and the waistband portion and the flap portion are respectively stretched in the circumferential direction of the wearer's torso. The object is achieved by providing a disposable diaper having a stretchable part.

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.
As shown in FIG. 1, a disposable diaper 1 (hereinafter also referred to as diaper 1) as an embodiment of the present invention includes a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and both the sheets. 2 has a liquid-retaining absorbent core 4 interposed between two and three, has waistband portions 10 and 10 on both sides of a rear portion A in the longitudinal direction, and a band fastening portion on one of the left and right waistband portions. 11, flap portions 20 and 20 are provided on both sides of the front portion B in the longitudinal direction, and a diaper fastening portion 21 is provided on each flap portion 20.
The longitudinal direction of the disposable diaper is a direction that coincides with the wearer's front-rear direction when the diaper is worn, and is a vertical direction in FIG. The rear part and the front part of a disposable diaper are the area | regions from each both-ends edge of a diaper longitudinal direction to 1/3 rank of a diaper full length. Although the back part A in this embodiment is a site | part distribute | arranged to a wearer's back side, the diaper of this invention can distribute | arrange a back part to both a wearer's back side and abdominal side. It may be a diaper.

  The absorbent core 4 is sandwiched and fixed by the top sheet 2 and the back sheet 3, and the waist part 5 and the leg part 6 in the peripheral part of the absorbent core 4 are used for fitting each part to the diaper wearer. A waist elastic member 51 and a leg elastic member 61 are disposed. The leg elastic member 61 forms leg gathers on both right and left sides of the crotch part C. Moreover, the solid guard 7 is formed in the longitudinal direction left and right both sides of the disposable diaper 1, respectively. A three-dimensional guard elastic member 71 is disposed at the free end of the three-dimensional guard 7 to form a gather.

Both waist band parts 10 are band part expansion-contraction parts in which each part in the diaper width direction (the same as the extending direction of the waist band part 10, left-right direction in FIG. 1) expands and contracts in the circumferential direction of the wearer's torso. 12
In more detail, the band part expansion-contraction part 12 is formed in the front end side of the extension direction of each waist band part 10, and each band part expansion-contraction part 12 is between the upper edge of the waist band part 10, and a lower edge. It is over.
The waistband portion 10 is a portion that extends outward in the diaper width direction from the position of the diaper side edges in the minimum width portion of the crotch portion C in the rear portion A, and the absorbent core 4 does not exist. preferable. Moreover, the circumferential direction of the wearer's torso is synonymous with the width direction of the disposable diaper extending in a planar shape (the left-right direction in FIG. 1).

Both waist band parts 10 in the diaper 1 are a band part stretchable part 12 formed on the distal end side in the extending direction, and a non-stretchable part 13 having substantially no stretchability formed at a position near the base end thereof. And have.
The both waistband portions 10 are composed of a composite sheet in which a stretchable sheet forming the band stretchable portion 12 and a sheet forming the non-stretchable portion 13 are connected to both side edges of the main body portion of the rear portion A. It is formed by bonding by a known bonding method such as an adhesive, heat sealing, ultrasonic sealing or the like.

Both the flap parts 20 become the flap part expansion-contraction part 22 in which a part in the diaper width direction (the same as the extension direction of the flap part 20 and the left-right direction in FIG. 1) respectively expands and contracts in the circumferential direction of the wearer's torso. ing.
In more detail, the flap part expansion-contraction part 22 is formed in the position near the base end of the extension direction of each flap part 20, and each flap part expansion-contraction part 22 is the upper edge of the flap part 20, and a lower edge. In between.
The flap portion 20 is a portion that extends outward in the diaper width direction from the position of the diaper side edges in the minimum width portion of the crotch portion C in the front portion B, and it is preferable that the absorbent core 4 is not present. .

Both flap portions 20 in the diaper 1 are a flap portion stretchable portion 22 formed at a position near the proximal end in the extending direction, and a non-stretchable portion 23 that is substantially non-stretchable and formed on the distal end side thereof. Have
The two flap portions 20 are bonded to the both side edges of the main body portion of the front portion B with a composite sheet in which a stretchable sheet that forms the flap portion stretchable portion 22 and a sheet that forms the non-stretchable portion 23 are connected. It is formed by joining by a known joining method such as an agent, heat sealing, ultrasonic sealing or the like.

The diaper 1 can be worn by the wearer in the same manner as a conventional waistband type diaper.
For example, as shown in FIG.2 and FIG.3, the center part of the rear part A diaper width direction is located in a wearer's back side, and both waistband parts 10 are brought to a wearer's belly side. And the waistband part 10 which has the band fastening part 11 is piled up on the other waistband part 10, and both waistband parts are mutually connected in the wearer's belly side via the band fastening part 11. FIG.
Next, the front part B pulled out to the front of the wearer through the wearer's crotch is pulled up to the height of the waistband part 10, and each diaper fastening part 21 is connected while pulling the front part B left and right. The waistband portion 10 is engaged and fixed.

  In the diaper 1, the band part expansion / contraction part 12 of the waist band part 10 and the flap part expansion / contraction part 22 of the flap part 20 are preferably in a state where the diaper is worn (in a diaper wearing state) as shown in FIG. The part 12 and the flap part stretchable part 22 are formed so as to overlap each other in the D between the left and right diaper fastening parts 21, 21. In FIG. 4, a portion where both the stretchable portions 12 and 22 are overlapped is indicated by a symbol P.

  In the diaper 1, the band part stretchable part 12 and the flap part stretchable part according to the circumference of the wearer's waist and the degree of tension of the waistband part and the stretchable part of the front part when worn on the wearer The degree of overlap with 22 changes. Therefore, depending on the wearer's body shape and the degree of pulling at the time of wearing, the band part stretchable part 12 and the flap part stretchable part 22 may not overlap.

In the present invention, even if the two stretchable parts may not overlap depending on the wearer's body shape and the degree of pulling at the time of wearing, at least in the following standard wearing state, the stretchable part 12 and the flap part of the waistband part. If the stretchable part 22 overlaps, it is assumed that both stretchable parts overlap in the diaper wearing state. Both stretchable parts need to overlap on either the back side or the abdomen side of the wearer.
(Standard wearing condition)
The standard wearing state refers to the state when the front end B is gripped in the diaper width direction until the load reaches 50 cN by gripping each front end portion (each end portion in the left-right direction in FIGS. 1 and 4) of the flap portion. The width of the front portion B is set to a wearer (or a wearer model) M whose circumferential length around the waist is twice the width W, with the width of the front portion B being a width W (see FIG. 4). In this state, the front portion B is stretched in the diaper width direction so that the width W is measured along the surface directed toward the waistband. In addition, the circumference of the wearer (or wearer model) around the waist measures the circumference at the site where the upper edge of the waistband is in contact.

  In the diaper of the present invention, the overlap width W1 (see FIG. 4) between the stretchable portion 12 of the waistband portion 10 and the stretchable portion 22 of the flap portion 20 in the standard wearing state is adaptable to individual differences in the wearer's body shape. And from a viewpoint of improving the fitting property around a leg reliably, it is preferable that it is at least 1 cm or more, and it is especially preferable that it is 2-5 cm.

  According to the diaper 1 of this embodiment, since it has the band part expansion-contraction part 12 and the flap part expansion-contraction part 22, and has the part P which both overlap in a wearing condition, the adaptability with respect to the individual difference of a wearer's body shape is high, An excellent fit can be obtained around the legs of a wide range of wearers.

Preferably, assuming that the diaper 1 of the present embodiment is a standard body wearer (hereinafter referred to as a standard wearer), the band wearable elastic part 12 and the flap elastic part 22 are provided to the standard wearer to some extent. It is designed so that an ideal leg hole shape can be obtained when it is mounted in an elongated state.
When the actual circumference of the wearer's waist is longer than the circumference of the standard wearer's waist, the band part stretchable part 12 and the flap part stretchable part 22 are expanded more than the standard wearer. And put on. On the contrary, when the circumference of the actual wearer's waist is shorter than the circumference of the standard wearer's waist, the band part stretchable part 12 and the flap part stretchable part 22 are not stretched or worn as standard. Elongate and wear smaller than the person. In this way, even if there is a certain difference between the actual wearer's body shape and the standard wearer's body shape by changing the degree of expansion or contraction of the band portion stretchable portion 12 and the flap portion stretchable portion 22. An appropriate leg hole shape assumed at the time of designing can be obtained, and excellent leakage prevention properties can be obtained regardless of individual differences in the actual body shape of the wearer.

In addition, in the wearing state, the band stretchable portion 12 and the flap stretchable portion 22 expand and contract satisfactorily, so that the posture of the stomach changes when worn or when the stomach is hungry or full. Even in the case where the change occurs, fluctuations in pressure applied to the wearer are reduced, and an excellent wearing feeling can be obtained. Furthermore, even if it is too tight, the pressure applied to the wearer is reduced.
Further, the stretchable part has a larger surface friction than the non-stretchable part, and the stretchable parts are overlapped with each other, so that the shift is less likely to occur between the band part and the flap part or the front body or the front part. The frictional resistance between the stretchable parts is large because of the shrinkage of the stretchable material placed under stretch, irregularities or gathers are formed on the surface, the unevenness of both stretchable parts is entangled, or the material showing stretchability is In many cases, it is made of rubber or other elastomers, and these materials have a very large surface frictional resistance.

  In the diaper of the present invention, as described above, excellent leakage prevention properties can be obtained regardless of individual differences in the actual user's body shape, etc., so that the width of the absorbent core 4 in the crotch C is reduced to some extent. Thus, the wearability can be improved. The minimum width of the absorbent core 4 of the crotch C can be set to 5 to 7 cm in a diaper for infants, for example. The minimum width here is measured in parallel with the width direction of the diaper in a state where the diaper is spread in a plane as shown in FIG.

As a stretchable sheet for forming the band stretchable portion 12 and the flap stretchable portion 22, various known stretchable sheets can be used, for example, stretched in the diaper width direction on one or both sides of a sheet made of an elastomer material. A laminated sheet formed by laminating possible fiber assemblies can be used.
As the elastomer material, natural rubber, synthetic rubber such as butadiene and isoprene, and the like are preferably used. As the sheet made of an elastomer material, an elastic film obtained by forming an elastomer material into a film, a sheet obtained by forming an elastic fiber made of an elastomer material into a net shape or a non-woven fabric, and the like are preferably used.
As a fiber assembly that can be stretched in the width direction of the diaper, a nonwoven fabric that itself has extensibility without performing secondary processing such as formation of slits, for example, a non-woven fabric made of spandex, etc. What does not have a thing which gave extensibility by secondary processing, such as formation of a slit, etc. can be used.

Further, as the stretchable sheet forming the band stretchable portion 12 and the flap stretchable portion 22, those described in Patent Documents 1 and 2, JP-A-9-290002, JP-A-9-299404, etc. It can also be used.
In addition, as a sheet | seat material which forms parts other than the expansion-contraction part of a waistband part or a flap part, various well-known sheet | seat materials conventionally used for a disposable diaper etc., for example, a nonwoven fabric, a laminate of a nonwoven fabric and a resin film, etc. As the nonwoven fabric, for example, a thermal bond nonwoven fabric, a needle punched nonwoven fabric, a spunlace nonwoven fabric and the like can be preferably used.

The surface of the waistband portion 10 on the back sheet 3 side is preferably made of a material that can be directly engaged with the convex member of the mechanical fastener. Examples of such a sheet material include various nonwoven fabrics such as a thermal bond nonwoven fabric, a needle punch nonwoven fabric, and a spunlace nonwoven fabric.
The band fastening part 11 and the diaper fastening parts 21, 21 may be a convex member of a mechanical fastener having a number of hook-shaped or hook-shaped male engagement members arranged on the surface thereof. As the convex member of the mechanical fastener, for example, “Magic Tape (registered trademark)” (manufactured by Kuraray Co., Ltd.), “Quicklon (registered trademark)” (manufactured by YKK), “Majikurosu (registered trademark)” (Kanebo Bell Touch Co., Ltd.) Commercially available products such as manufactured) can be used.
In addition, as a constituent material, such as the surface sheet 2, the back surface sheet 3, the absorptive core 4, and the three-dimensional guard 7, various well-known materials conventionally used for disposable diapers can be used without particular limitation.

Next, diapers 1A to 1C as other embodiments of the present invention will be described with reference to FIGS. About napkin 1A-1C, a different point from the napkin 1 mentioned above is mainly demonstrated, About the same point, the same code | symbol is attached | subjected and description is abbreviate | omitted. About the point which is not mentioned especially, the description regarding the diaper 1 mentioned above is applied suitably.
In the diaper 1A of 2nd Embodiment, as shown in FIG. 5, in each waistband part 10, the position which deviated slightly toward the front end side from the vicinity part of the base end part of the extension direction, and the center part of the extension direction And two band part expansion-contraction parts 12a and 12 are formed. In the wearing state, particularly in the standard wearing state described above, as shown in FIG. 5 (b), the band part stretchable part 12 and the flap part stretchable part 22 overlap each other. In addition, one band part expansion-contraction part 12a and the other band expansion-contraction part 12 are spaced apart, and the diaper fastening part 21 engages and fixes between these both expansion-contraction parts.

  In the diaper 1 </ b> B of the third embodiment, as shown in FIG. 6, substantially the entire area of each waistband portion 10 excluding the vicinity of the front end portion in the extending direction is a band portion stretchable portion 12. In the diaper 1 </ b> C of the fourth embodiment, as shown in FIG. 7, the entire area of each waistband part 10 is a band part stretchable part 12.

  Also in the diapers 1A to 1C of the second to fourth embodiments, the stretchable portion 12 of the waistband portion 10 and the stretchable portion 22 of the flap portion 20 overlap each other in the worn state. Similar effects are achieved.

  In the present invention, for example, as shown in FIG. 8, a second diaper fastening portion 24 is provided between the stretchable portion 22 of one flap portion 20 and the stretchable portion 22 of the other flap portion 20. It is preferable. In the present invention, since each of the flap portions 20 of the front portion B is provided with the stretchable portion 22, the front portion B in a state where the diaper has absorbed a large amount of excrement is shifted downward. If it is easy to fall and is hooked on another object, the engagement of the diaper fastening part may be released. A diaper fastening part 24 is provided between the left and right stretchable parts 22, and the front part B is engaged and fastened to the waistband part between the left and right stretchable parts 22. The release of the match can be prevented.

From the viewpoint of ensuring such an effect, the second diaper fastening part 24 is preferably provided on each of the flap parts 20. When the second diaper fastening part 24 is formed so as to overlap the absorbent core 4, the slippage prevention effect is reduced. Moreover, as shown in FIG. 9, when there is a certain distance between the edge of the front part B and the edge of the absorptive core 4, the 2nd diaper fastening part 24 is put between both edges. It is also preferable to provide it. According to the embodiment of FIG. 9, the same effect as that of the embodiment of FIG. 8 can be obtained.
In addition, the structure of the front part B shown in FIG. 8 or FIG. 9 can also be applied to any of the diapers 1 and 1A to 1D described above. Moreover, as a forming material of the 2nd diaper fastening part 24, the thing similar to the diaper fastening part 21 can be used.

  In the disposable diaper of the present invention, when leg elastic members 61 for forming leg gathers are arranged on both sides of the crotch C, as in the diaper 1 shown in FIG. 1, the stretchable part 22 of the flap part 20 and the leg It is preferable that the elastic member 61 is separated in the diaper longitudinal direction. The expansion / contraction part 22 of the flap part 20 and the leg elastic member 61 are separated from each other, so that the flap part can be prevented from contracting due to the contraction force of the leg elastic member 61. The separation distance L1 between the stretchable portion 22 of the flap portion 20 and the leg elastic member 61 is preferably 0 to 5 cm, and particularly preferably 2 to 5 cm. In addition, in the diaper 1 shown in FIG. 1, the expansion-contraction part 22 and the leg elastic member 61 of the flap part 20 have shifted | deviated to the diaper width direction, Therefore Therefore, shrinkage | contraction of a flap part can be prevented further. .

  As preferable embodiment of the diaper cover of this invention, what removed the absorptive core from the diaper 1,1A-1D of each embodiment mentioned above can be mentioned. The diaper cover of the present invention is usually used by arranging an auxiliary absorbent member having a liquid-retaining absorbent core on the inner surface side (surface sheet side). As the auxiliary absorbent device, various known ones can be used.

The disposable diaper and diaper cover of this invention are not restrict | limited to embodiment mentioned above, A various change is possible in the range which does not deviate from the meaning of this invention.
For example, a part or all of the waist elastic elastic member 51, the leg elastic elastic member 61, and the three-dimensional guard 7 in the diaper of each embodiment described above can be omitted.
Moreover, although the flap part expansion-contraction part 22 in the diaper of each embodiment mentioned above was formed only in a part near the base end part of the flap part 20, the base end 23 side from the center of the extension direction of the flap part 20 It is also possible to make the half of the elastic part 22 or the entire flap part 20 the elastic part 22.
Moreover, you may provide the band part fastening part 11 in both waist band parts. Moreover, the disposable diaper of this invention may be any diaper for infants and adults.

Drawing 1 is a top view showing the state where the disposable diaper which is one embodiment of the present invention was expanded in the shape of a plane. FIG. 2 is a perspective view showing an example of a wearing state of the disposable diaper of FIG. 3 is a diagram showing a wearing state of the disposable diaper of FIG. 1, and is a cross-sectional view taken along the line II-II of FIG. FIG. 4 is a diagram showing an overlapping state of the waistband portion and the front portion in the standard wearing state of the disposable diaper of FIG. 1. FIG. 5 is a view showing a disposable diaper according to another embodiment of the present invention. FIG. 5 (a) is a schematic plan view, and FIG. 5 (b) is a view corresponding to FIG. FIG. 6 is a view showing a disposable diaper as still another embodiment of the present invention, FIG. 6 (a) is a schematic plan view, and FIG. 6 (b) is a view corresponding to FIG. FIG. 7 is a view showing a disposable diaper as still another embodiment of the present invention, FIG. 7 (a) is a schematic plan view, and FIG. 7 (b) is a view corresponding to FIG. FIG. 8 is a view showing a disposable diaper as still another embodiment of the present invention. FIG. 9 is a view showing a disposable diaper as still another embodiment of the present invention.

Explanation of symbols

1, 1A-1C Disposable diaper 2 Top sheet 3 Back sheet 4 Absorbent core 10 Waist band part 11 Band fastening part 12 Band part elastic part (elastic part)
20 flap part 21 diaper fastening part 22 flap part stretchable part (stretchable part)
A Back part B Front part C Inseam

Claims (5)

It has an absorptive core, has waistband portions on both sides of the longitudinal rear portion, and is provided with a band fastening portion on at least one of the left and right waistband portions, and has a longitudinal front portion. It has a flap part on both sides, and a diaper fastening part is provided in each flap part,
A disposable diaper that is configured so that the front portion can be fixed and worn on the waistband portion by the diaper fastening portion after the left and right waistband portions are connected by the band fastening portion. There,
Each of the waistband part and the flap part has an elastic part that expands and contracts in the circumferential direction of the wearer's torso ,
A disposable diaper in which a second diaper fastening part is provided between the elastic part of one flap part and the elastic part of the other flap part . 2. Each of the flap portions has the stretchable portion at a position near the proximal end in the extending direction, and has a non-stretchable portion that does not substantially have stretchability on the distal end side in the extending direction. The disposable diaper described.   The disposable diaper according to claim 2, wherein the second diaper fastening part is provided in each of the flap parts.   Leg elastic members for leg gather formation are arranged on both sides of the crotch part, and the elastic part of the flap part and the leg elastic member are separated in the diaper longitudinal direction. The disposable diaper described. Has a waistband part on both sides of the rear part in the longitudinal direction, has a band fastening part on at least one of the left and right waistband parts, and has a flap part on both sides of the front part in the longitudinal direction , A diaper fastening part is provided in each flap part,
A diaper cover that is configured so that the front part can be fixed and worn on the waistband part by the diaper fastening part after the left and right waistband parts are connected by the band fastening part. There,
Each of the waistband part and the flap part has an elastic part that expands and contracts in the circumferential direction of the wearer's torso ,
A diaper cover in which a second diaper fastening part is provided between the elastic part of one flap part and the elastic part of the other flap part .

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