JP5445322B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper. More specifically, the present invention relates to a disposable diaper that is excellent in fit and hardly leaves a mark on the wearer's skin due to an elastic material.

  Conventionally, pants-type or tape-type disposable diapers have been used as disposable diapers that absorb excreted fluid such as urine (see, for example, Patent Documents 1 and 2).

  For example, a pants-type disposable diaper is arranged such that the absorbent body 122 and at least a part thereof are made of a liquid-permeable material and cover the surface of the absorbent body 122, like the disposable diaper 100 shown in FIGS. 5A and 5B. An absorbent body 114 having a top sheet 118 and a back sheet 120 made of a liquid-impermeable material and arranged to cover the back surface of the absorbent body 122, and an exterior body 116, It consists of each part of the crotch part 4 and the back body 6, and the corresponding side edges 2a, 6a (2b, 6b) of the front body 2 and the back body 6 are joined to each other, and one waist opening 110 and a pair of leg openings The disposable diaper in which the part 112 (112a, 112b) was formed. Here, FIG. 5A is a perspective view showing a conventional pants-type disposable diaper, and FIG. 5B is a schematic plan view showing a state in which the pants-type disposable diaper of FIG. 5A is developed and viewed from the top sheet side.

  According to such a pants-type disposable diaper 100, the excrement of the wearer is made of a liquid-impermeable material while being absorbed by the absorbent body 122 through the liquid-permeable portion of the top sheet 118. Since the back sheet 120 prevents leakage to the outside, the excrement can be held inside the diaper.

  In such a disposable diaper 100, for example, a plurality of stretchable materials 130 (hereinafter sometimes referred to as "waist-around stretchable materials") are arranged along the waist opening 110 of the diaper. This gives stretch around the waist and improves fit around the waist.

  Such a stretchable material 130 is normally arranged in parallel with a predetermined interval between two sheets 116a and 116b constituting the exterior body 116, as shown in FIGS. 5C and 5D, for example. . That is, the stretchable material 130 is fixed by being sandwiched between the two sheets (the inner sheet 116a and the outer sheet 116b), and a stretchable portion of the diaper is formed. Here, FIG. 5C is a schematic cross-sectional view showing a B-B ′ cross section of the disposable diaper of FIG. 5B, and FIG. 5D is an enlarged view of the disposable diaper of FIG. 5C.

JP 2007-244506 A JP 2008-029580 A

  However, the stretchable part formed by sandwiching the stretchable material by such two sheets has a narrow interval between the stretchable materials arranged substantially in parallel, and the stretchable materials are densely arranged. For this reason, there is a problem that a stretched material mark (rubber mark) is easily attached to the wearer's skin, and a problem that the stretched part is not easy to touch.

  Further, in order to make it difficult for the soft touch and the trace of the stretchable material to be attached, it is conceivable to widen the interval between the stretchable materials disposed between the two sheets. However, simply disposing the stretchable material at a wide interval reduces the number of stretchable materials, so the strength of the stretchable material is relatively reduced, and the stretchability of the portion where the stretchable material is placed also decreases. Resulting in. In addition, when the strength of one stretchable material is increased by the amount of the number of stretchable materials, there is also a problem that the trace of the stretchable material is easily attached.

  This invention is made | formed in order to solve the subject of such a prior art, and provides the disposable diaper which is excellent in fit property and cannot easily leave the trace by an elastic material on a wearer's skin.

  As a result of intensive investigations to solve the problems of the prior art as described above, the inventor has at least three sheets (first sheet, Between the at least three sheets constituting the sheet lamination part, that is, between the first sheet and the second sheet, and the second sheet. By forming the elastic material disposed between the first sheet and the third sheet, it is possible to excessively increase the strength of one elastic material without excessively widening the space between the elastic materials arranged in the elastic region. The present invention was completed by conceiving that the above-mentioned problems could be solved. Specifically, the following disposable diapers are provided by the present invention.

[1] An outer body constituting the front body, crotch part and rear body of the diaper, an absorbent body, and a top made of at least a part made of a liquid-permeable material so as to cover the upper surface side of the absorbent body And an absorbent main body having a back sheet made of a liquid-impermeable material disposed so as to cover the lower surface side of the absorbent body, and at least a part of the exterior body is a first sheet A plurality of expansion / contractions arranged in a stretched state so as to be parallel to each other between a sheet lamination part in which at least three sheets of the second sheet and the third sheet are laminated and the sheets constituting the sheet lamination part A stretchable part is formed in at least a part of the exterior body by the sheet stacking portion and the plurality of stretchable materials, and the plurality of stretchable materials disposed in the stretchable part is a diaper. Placed around the waist And the plurality of elastic materials are arranged such that at least one elastic material is disposed between the first sheet and the second sheet, and other than the one elastic material. other stretchable material, is disposed between the second sheet and the third sheet, each sheet constituting the sheet stack unit, Ru are bonded to each other via the elastic member disposed between the seat cross In addition, at least two of the plurality of elastic materials are disposable disposed alternately between the first sheet and the second sheet and between the second sheet and the third sheet . Diapers.

[2] At least two of the plurality of elastic materials are arranged at intervals so that the arrangement positions of the two elastic materials do not overlap each other between the sheets. Disposable diapers described in 1.

[ 3 ] Each of the interval between the elastic members disposed between the first sheet and the second sheet, and the interval between the elastic members disposed between the second sheet and the third sheet. The disposable diaper according to [1] or [2] , which is 10 mm or more.

[ 4 ] The disposable diaper according to any one of [1] to [ 3 ], wherein an interval between the plurality of elastic materials is 5 to 10 mm.

[ 5 ] The stretchable material disposed between the first sheet and the second sheet and the stretchable material disposed between the second sheet and the third sheet are made of different materials. The disposable diaper according to any one of [1] to [ 4 ], which is a material.

[ 6 ] The stretchable material disposed between the first sheet and the second sheet and the stretchable material disposed between the second sheet and the third sheet have different stretch rates. The disposable diaper according to any one of [1] to [ 5 ], which is arranged in a state.

[ 7 ] Of the stretchable material disposed between the sheets constituting the sheet stacking portion, the stretch rate of the stretchable material disposed outside the diaper is higher than the stretch rate of the stretchable material disposed inside the diaper. The disposable diaper according to [ 6 ], wherein is large.

  The disposable diaper of the present invention is a sheet stack in which at least three sheets (first sheet, second sheet, and third sheet) are stacked at the stretchable part formed by placing the stretchable material between the sheets. And a plurality of elastic materials arranged between the sheets constituting the sheet lamination portion, and at least one elastic material is arranged between the first sheet and the second sheet Since the other elastic material other than the one elastic material is disposed between the second sheet and the third sheet, it has excellent fit, and the wearer's skin is less likely to be marked by the elastic material. .

  Moreover, the disposable diaper of this invention joins three sheets which comprise a sheet | seat lamination | stacking part mutually through the elastic | stretch material arrange | positioned between sheets, and this elastic material comprises a sheet | seat lamination | stacking part. It floats up from the sheet and can create a soft atmosphere at the stretchable part.

  Moreover, as a preferable form of the present invention, by using the stretchable material as a waistline stretchable material disposed around the waist of the diaper, the waistline has excellent fit, and the diaper is less likely to slip when worn.

  For example, as compared with the case where a stretchable material around the waist is disposed between two sheets as in a conventional disposable diaper, it is possible to make it difficult to make a soft hand and a mark due to the stretchable material on the skin. In particular, the appearance of the diaper is good because the above-described effects can be exhibited without reducing the number of elastic materials around the waist (that is, the number of the elastic materials arranged at intervals along the waist direction).

It is a perspective view showing one embodiment of the disposable diaper of the present invention. It is a schematic plan view which shows the state which expand | deployed the disposable diaper of FIG. 1A and was seen from the top sheet side. It is a schematic sectional drawing which shows the A-A 'cross section of the disposable diaper of FIG. 1B. It is an enlarged view of the disposable diaper of FIG. 1C. It is a schematic diagram which shows the joining state of each sheet | seat of the sheet | seat lamination | stacking part shown to FIG. 1D. It is an enlarged view which expands and shows typically the section of other embodiments of the disposable diaper of the present invention. It is the enlarged view which expands and shows typically the cross section of other embodiment of the disposable diaper of this invention. It is a schematic plan view which expands further another embodiment of the disposable diaper of this invention, and shows the state seen from the top sheet side. It is a perspective view which shows the conventional disposable diaper. It is the schematic plan view which shows the state which expand | deployed the disposable diaper of FIG. 5A, and was seen from the top sheet side. It is a schematic sectional drawing which shows the B-B 'cross section of the disposable diaper of FIG. 5B. It is an enlarged view of the disposable diaper of FIG. 5C.

  Hereinafter, the form for implementing the disposable diaper of this invention is demonstrated concretely. However, the present invention broadly encompasses disposable diapers having the invention specific items, and is not limited to the following embodiments.

[1] Configuration of the disposable diaper of the present invention:
The disposable diaper of the present invention includes an outer package 16, an absorbent body 22, and an absorbent body 22 that constitute the front body 2, the crotch 4, and the rear body 6 of the diaper, as in the disposable diaper 1 </ b> A illustrated in FIGS. 1A and 1B. The top sheet 18 that is disposed so as to cover the upper surface side and that is at least partially made of a liquid permeable material, and the liquid impervious material that is disposed so as to cover the lower surface side of the absorber 22. A disposable diaper 1 </ b> A including an absorbent main body 14 having a backsheet 20.

  In the disposable diaper 1A of the present invention, as shown in FIGS. 1C and 1D, at least a part 16X of the exterior body 16 is composed of at least three sheets of a first sheet 66a, a second sheet 66b, and a third sheet 66c. Between the sheet laminating portion 66 where the sheets are laminated and the sheets 66a, 66b, 66c constituting the sheet laminating portion 66, they are arranged in an extended state so as to be parallel to each other (for example, along each other in one direction) And a plurality of elastic members 68, wherein at least one elastic material 68a is disposed between the first sheet 66a and the second sheet 66b, and An elastic material 68b other than the elastic material 68a is disposed between the second sheet 66b and the third sheet 66c, and the sheets 66a, 66b, 66c constituting the sheet stacking portion 66 are Stretchable members 68a disposed intercluster each other, are joined together via 68b.

  In the disposable diaper of the present invention, the stretchable part (that is, at least a part 16X of the exterior body 16 in FIGS. 1A to 1D) formed by placing a stretchable material between the sheets is the above-described sheet laminate portion and this sheet. It is formed by a plurality of elastic materials arranged between the sheets constituting the laminated portion, and one elastic material and another elastic material are arranged between different sheets. For this reason, a plurality of elastic materials are dispersed and arranged between the sheets, so that the fit is excellent and the wearer's skin is hardly traced by the elastic materials. That is, it does not excessively widen the spacing between the stretchable materials arranged in the stretchable part, and does not excessively increase the strength of one stretchable material, so that the fit is excellent and the wearer's skin is hardly traced by the stretchable material. Disposable diapers can be realized.

  Moreover, the disposable diaper of this invention is a sheet | seat which an elastic material comprises a sheet | seat lamination | stacking part by joining three sheets which comprise a sheet | seat lamination | stacking part mutually via the elastic material arrange | positioned between sheets. From the surface, it can create a soft atmosphere in the stretchable part. For example, when the same number of stretchable materials as the stretchable parts in the present invention are arranged between two sheets, the spacing between the stretchable materials becomes narrow, making it difficult to obtain the above-described lifting effect. Also, if the elastic material is arranged with a wide space between the two sheets, the strength of the elastic part decreases, so it is necessary to increase the expansion ratio of the elastic material or use strong rubber. In any case, the wearer's skin is easily marked with a stretch material.

  Here, FIG. 1A is a perspective view showing one embodiment of the disposable diaper of the present invention, and FIG. 1B is a schematic plan view showing a state where the disposable diaper of FIG. 1A is developed and viewed from the top sheet side. is there. FIG. 1C is a schematic cross-sectional view showing the A-A ′ cross section of the disposable diaper of FIG. 1B, and FIG. 1D is an enlarged view of the disposable diaper of FIG. 1C.

  In the disposable diaper 1A shown in FIGS. 1A to 1D, the stretchable part constituted by at least a part 16X of the exterior body 16 is around the waist, and the stretchable material 68 disposed in the stretchable part is a diaper. Although the example (in other words, example of waist gathers) in the case of the elastic material 52 around the waist arranged around the waist is shown, the elastic part is not limited to the elastic part around the waist. Other parts may be used as long as the elastic material can be disposed on the exterior body constituting the disposable diaper.

  For example, an abdominal circumference elastic material 54 (Tammy Gather) arranged around the stomach of the diaper may be adopted as the elastic material arranged at the expansion / contraction part, and the leg circumference arranged around the leg of the diaper An elastic material 56 (leg gather) may be employed. Further, in addition to the above waist, abdomen, and leg circumferences, an elastic material may be arranged to form an elastic part having the above-described configuration.

  The disposable diaper 1A shown in FIG. 1A to FIG. 1D has excellent fit around the waist by making the stretchable material 68 disposed in the stretchable part (exterior body part 16X) the waist stretchable material 52. When the diaper is worn, the diaper can be a disposable diaper that is difficult to slip.

  For example, as compared with the case where a stretchable material around the waist is disposed between two sheets as in a conventional disposable diaper, it is possible to make it difficult to make a soft hand and a mark due to the stretchable material on the skin. In particular, the appearance of the diaper is good because the above-described effects can be exhibited without reducing the number of elastic materials around the waist (that is, the number of the elastic materials arranged at intervals along the waist direction).

  In the disposable diaper 1A shown in FIGS. 1A to 1D, the diaper outer package 16 is constituted by an inner sheet 16a and an outer sheet 16b, and the inner sheet 16a becomes the second sheet 66b of the sheet stacking portion 66, The outer sheet 16b is the first sheet 66a and the third sheet 66c of the sheet stacking portion 66. Specifically, the third sheet 66c, which is the outer sheet 16b, is folded inside the diaper at the waist opening 10 of the diaper (that is, so as to cover the second sheet 66b, which is the inner sheet 16a). A first sheet 66a extended from the outer sheet 16b is formed. As described above, the three sheets 66a, 66b, and 66c constituting the sheet stacking unit 66 are not three independent sheets, but the three sheets are stacked at the stretchable portion by folding the sheets. It may be in a state of being made.

  Specifically, FIG. 1D shows an example in which the first sheet 66a and the third sheet 66c are configured by one continuous sheet (specifically, the outer sheet 16b). For example, like the disposable diaper 1B shown in FIG. 2, the first sheet 66a, the second sheet 66b, and the third sheet 66c may be separate independent sheets. However, as described above, by forming the first sheet 66a and the third sheet 66c by folding the outer sheet 16b, the stretchable part in the present invention can be more easily formed. Here, FIG. 2 is an enlarged view schematically showing an enlarged cross section of another embodiment of the disposable diaper of the present invention. 2 is a portion similar to the cross section shown in FIG. 1D.

  Hereinafter, each component of the disposable diaper of this invention is demonstrated in detail.

[1-1] Exterior body:
The exterior body constitutes the front body, the crotch part, and the back body of the diaper, and examples thereof include an exterior body composed of a laminated sheet in which an inner sheet and an outer sheet are laminated.

  Sheets constituting the exterior body (for example, the inner sheet and outer sheet described above) can be composed of a nonwoven fabric or the like, for example, a nonwoven fabric composed of synthetic fibers made of polyethylene, polypropylene, polyester, or other thermoplastic resin. The sheet | seat which consists of etc. can be mentioned as a suitable example.

  As shown in FIG. 1E, the sheets 66a, 66b, and 66c constituting the sheet stacking portion 66 are joined to each other through stretchable materials 68a and 68b disposed between the sheets. By comprising in this way, each sheet | seat 66a, 66b, 66c is mutually independent in parts other than the expansion | extension material 68a, 68b arrange | positioned, and can improve the fitting property of a diaper. Here, FIG. 1E is a schematic diagram illustrating a bonding state of the sheets in the sheet stacking portion illustrated in FIG. 1D.

  In FIG. 1E, each sheet 66a, 66b, 66c is independent in drawing (that is, the sheets 66a, 66b, 66c are joined to each other only by the elastic members 68a, 68b. 66b and 66c are not substantially joined to each other), so that there is a gap between the sheets 66a, 66b and 66c. However, in an actual disposable diaper, the sheets 66a, 66b, The sheets are laminated with almost no gaps due to the flexibility of 66c.

  Examples of a method for fixing each of the sheets 66a, 66b, 66c and the elastic members 68a, 68b include a method using a hot melt adhesive or other highly fluid adhesive. The hot melt adhesive or the like is preferably applied (coated) to an elastic material. There is no restriction | limiting in particular about the method of apply | coating an adhesive agent, For example, any method of a contact type and a coating type may be sufficient. For example, it can also apply | coat by methods, such as spraying an adhesive along the direction which arrange | positions an elastic material.

  In the disposable diaper of this invention, as above-mentioned, the expansion-contraction site | part comprised by at least 3 sheet | seat (1st sheet, 2nd sheet, and 3rd sheet) is only by the elastic material arrange | positioned between sheets. It is preferable that the sheets other than the elastic material are bonded to each other and are not bonded. By configuring in this way, since the part where the sheets are connected to each other is only the place where the elastic material is disposed, each sheet is less likely to be restrained by other sheets, and the flexibility of the elastic part is better. Can be.

  As explained so far, in the disposable diaper of the present invention, at least a part of the exterior body is a sheet laminating portion in which at least three sheets of the first sheet, the second sheet, and the third sheet are laminated. A stretchable region having a plurality of stretchable materials arranged in a stretched state in a predetermined direction is formed between the sheets constituting the sheet stacking portion.

  The first sheet, the second sheet, and the third sheet are preferably constituted by a part of the inner sheet and the outer sheet described above, or are sheets extended from the inner sheet and the outer sheet. For this reason, the first sheet, the second sheet, and the third sheet can be constituted by a nonwoven fabric or the like, for example, from a nonwoven fabric or the like constituted by a synthetic fiber made of polyethylene, polypropylene, polyester, or other thermoplastic resin. The sheet | seat which becomes can be mentioned as a suitable example. As shown in FIG. 2, a sheet (sheet 66a) other than the inner sheet and the outer sheet can be used as the third sheet.

  In the disposable diaper of the present invention, at least two of the plurality of elastic members arranged in the elastic part are spaced apart from each other so that the arrangement positions of the two elastic materials do not overlap each other between the sheets. It is preferable that they are arranged in a space. For example, when the plurality of elastic materials include a first elastic material, a second elastic material, and a third elastic material, between the first elastic material and the second elastic material adjacent to the first elastic material. In addition, it is preferable that the third stretchable material is located. By comprising in this way, it can prevent effectively that an elastic material is arranged densely, and the trace by an elastic material becomes difficult to stick to a wearer's skin. As described above, it is preferable that the at least two stretchable materials are arranged at intervals so that their arrangement positions do not overlap. For example, between the first sheet and the second sheet, and Other elastic materials (that is, elastic materials other than the elastic material arranged at intervals) arranged between the second sheet and the third sheet are arranged so that their arrangement positions partially overlap. Also good.

Furthermore, at least two telescopic members of this plurality of stretchable material, and between the first sheet and the second sheet, that are arranged alternately and between the second sheet and third sheet. By comprising in this way, compared with the case where an elastic material is arrange | positioned between two sheets, the arrangement | positioning space | interval of an elastic material can be expanded substantially twice, and it is depended on an elastic material on a wearer's skin. Traces are extremely difficult to follow. The disposable diaper 1A shown in FIG. 1D shows an example in which the elastic members 68 are alternately arranged between the first sheet 66a and the second sheet 66b and between the second sheet 66b and the third sheet 66c. . Of course, in the disposable diaper of the present invention, if a plurality of stretchable materials are arranged between both the first sheet and the second sheet and between the second sheet and the third sheet, for example, FIG. As shown in the disposable diaper 1 </ b> C, adjacent stretchable materials 68 do not have to be alternately arranged. In FIG. 3, two elastic members 68a are continuously arranged between the first sheet 66a and the second sheet 66b from the waist opening of the diaper toward the crotch side, and then the second sheet. An example in which two stretchable materials 68b are continuously arranged between 66b and the third sheet 66c is shown. Here, FIG. 3 is an enlarged view schematically showing an enlarged cross section of still another embodiment of the disposable diaper of the present invention. In addition, the cross-sectional site | part in FIG. 3 is a site | part similar to the cross section shown to FIG. 1D.

  About the space | interval at the time of arrange | positioning a some elastic material, the space | interval can be suitably set according to the arrangement positions, such as a waist circumference, a stomach circumference, or a leg circumference. For example, when the elastic material is disposed around the waist (waist-around elastic material), it is preferably 5 to 10 mm. In addition, the said space | interval is an arrangement | positioning space | interval of the elastic material arrange | positioned between the sheets of a sheet | seat lamination | stacking part irrespective of the distinction between the 1st sheet and the 2nd sheet, and between the 2nd sheet and the 3rd sheet. . If the interval when arranging a plurality of elastic materials is less than 5 mm, the interval between the elastic materials is too narrow, and the traces of the elastic materials (rubber marks) may be easily attached to the wearer's skin, If it exceeds 10 mm, the spacing between the stretchable materials is wide, the number of stretchable materials arranged in a certain range is reduced, and the strength of the stretchable material may be relatively lowered.

  Moreover, each of the space | interval of the elastic material arrange | positioned between a 1st sheet | seat and a 2nd sheet | seat, and the space | interval of the elastic material arrange | positioned between a 2nd sheet | seat and a 3rd sheet | seat may be 10 mm or more. It is preferably 10 to 30 mm, more preferably 15 to 25 mm. By comprising in this way, the space | interval of the elastic material arrange | positioned between two sheets (namely, between a 1st sheet | seat and a 2nd sheet | seat or between a 2nd sheet | seat and a 3rd sheet | seat) is wide. It becomes more difficult for the stretcher material to adhere to the wearer's skin.

  There is no restriction | limiting in particular about the number of the elastic materials arrange | positioned at a sheet | seat lamination | stacking part. Moreover, the thickness, the expansion ratio, and the like can be appropriately set according to the purpose. For example, it is possible to determine the constituent material, the stretch rate of the material, the stretched state at the time of fixing, and the like after considering the degree of shrinkage of the gathers.

  As said elastic material, the elastic material currently used for absorbent articles, such as the conventional disposable diaper, can be used. Specific examples include thread rubber made of an elastic material such as natural rubber and synthetic rubber (urethane rubber, etc.), flat rubber, stretchable net, stretchable film, stretchable foam (urethane foam, etc.), and the like.

  In the disposable diaper of the present invention, for example, the elastic material disposed between the first sheet and the second sheet is different from the elastic material disposed between the second sheet and the third sheet. It may be an elastic material of material or strength. In addition, for example, the elastic material arranged between the first sheet and the second sheet and the elastic material arranged between the second sheet and the third sheet are arranged in a state where the expansion ratios are different. It may be a thing. Thus, in the disposable diaper of the present invention, conventionally, a plurality of stretchable materials arranged between two sheets are divided between the first sheet and the second sheet, and the second sheet and the third sheet. It is possible to obtain a better wearing feeling and fitting feeling by changing the material, strength or stretch ratio between the sheets. It is.

  For example, out of the elastic material arranged between the sheets constituting the sheet lamination portion, the outer side of the diaper (wearer) than the stretch rate of the elastic material arranged inside the diaper (that is, the skin side of the wearer) It is preferable that the stretch rate of the stretchable material disposed on the clothing side is large. By configuring in this way, the stretch rate of the stretchable material arranged with the wearer's skin and one sheet separated from each other is small, and the stretchable material having a larger stretch rate is separated from at least two sheets. In contact with the wearer's skin. For this reason, it becomes difficult for the wearer's skin to be marked with a stretchable material. Moreover, since the elastic material with a larger expansion | extension rate is arrange | positioned on the outer side of a diaper, the stretchability of the whole sheet | seat lamination | stacking part can be ensured favorable.

  For example, in the disposable diaper of the present invention, it is preferable that the stretch rate of the elastic material disposed inside the diaper is 0.5 to 1 times the stretch rate of the stretch material disposed outside the diaper. More preferably, it is 0.6 to 0.9 times. By comprising in this way, a wearer's skin does not leave a mark easily and the stretchability of the whole sheet | seat laminated part can be ensured favorable.

  The above-described “stretch ratio” refers to a percentage of the length in the stretched state with respect to the length in the non-stretched state (“length in the stretched state” / “length in the non-stretched state” × 100). . Although not particularly limited, when the elastic material disposed on the outside of the diaper is, for example, natural rubber or synthetic rubber, it is fixed in an extended state (extension rate) of 120 to 400%. It is preferable to fix in an extended state of 200 to 300%.

  Moreover, when changing the strength (for example, tensile strength) of the elastic material between the inside and the outside of the diaper, for example, it is arranged inside the diaper with respect to the strength of the elastic material arranged on the outside of the diaper. The strength of the stretchable material is preferably 0.5 to 1 time, more preferably 0.6 to 0.9 times. By comprising in this way, a wearer's skin does not leave a mark easily and the stretchability of the whole sheet | seat laminated part can be ensured favorable. Examples of methods for changing the strength of the elastic material include using different thickness materials as the elastic material to be used, and changing the strength of the rubber composition of the elastic material. Can do.

  Moreover, in the disposable diaper of the present invention, not only the material, strength, or stretch rate of the stretchable material disposed in the sheet stacking portion is changed, but also each sheet (first sheet, second sheet, and The third sheet) may be of a different material or characteristic.

  In FIG. 1A-FIG. 1D, although the example in the case of a pants type disposable diaper is shown as 1A of disposable diapers, the disposable diaper of this invention is not limited to a pants type disposable diaper, For example, It can also be applied to a tape-type disposable diaper.

  As shown in FIG. 1A, the “pants-type disposable diaper” includes an outer body 16 that forms a front body 2, a crotch part 4, and a back body 6 of the diaper, and an absorbent main body 14. And the corresponding side edges 2a, 6a (2b, 6b) of the back body 6 are joined together (joined part 8) to form one waist opening 10 and a pair of leg openings 12 (12a, 12b). It is a disposable diaper. The “tape-type disposable diaper” further includes a fastening tape for fixing the front body and the back body, and the diaper before use is unfolded. It is the disposable diaper comprised so that a wearer may wear | wear by fixing a back body mutually.

  Moreover, in this specification, when wearing a diaper to a wearer, the part which covers a wearer's belly side (front side of the body, the back body) means wearing a diaper to the wearer. When the wearer wears a diaper, the part that covers the wearer's crotch, especially in the unfolded disposable diaper In addition, it means a portion excluding the front body and the back body where an R-shaped notch that forms a leg opening is formed. That is, when the joint part of the pants-type disposable diaper is peeled and deployed, the portion sandwiched between the opening peripheral edges of the pair of left and right leg openings of the exterior body is referred to as the “crotch part”, and the front end of the exterior body from the front end of the crotch part The part leading up to (waist edge) is referred to as “front body”, and the part from the rear end of the crotch to the rear end of the exterior body is referred to as “rear body”.

[1-2] Absorbent body:
The disposable diaper of this invention is equipped with the absorptive main body as a member which bears the function which absorbs and hold | maintains the urine which the wearer excreted. This absorptive main body includes the absorbent body 22, the top sheet 18 disposed so as to cover the inner surface of the absorbent body 22, and the back sheet 20 disposed so as to cover the outer surface of the absorbent body 22. And a member that is fixed in a state in which the absorber 22 is sandwiched between the top sheet 18 and the back sheet 20 and is integrated into a pad shape.

[1-2A] Absorber:
The “absorber” is a member for absorbing and holding the wearer's urine and the like, and is made of an absorbent material. The absorber is sandwiched between the top sheet and the back sheet, and is used in an integrated state with both sheets.

  Examples of the “absorbent material” include fluff pulp, super absorbent polymer (hereinafter referred to as “SAP”), a hydrophilic sheet, and the like. “Fluff pulp” is made by pulverizing wood pulp or non-wood pulp into cotton, “SAP” is sodium polyacrylate, “Hydrophilic sheet” is tissue, absorbent paper, hydrophilized It is preferable to use a non-woven fabric that has been treated.

  As the absorber, it is preferable to use one or two or more absorbent materials formed into a single-layer or multi-layer mat. Especially, what combined 10-500 mass parts SAP with respect to 100 mass parts of fluff pulp is preferable. At this time, the SAP may be mixed in the fluff pulp mat or used in a layered manner between the fluff pulp mats.

[1-2B] Top sheet:
A top sheet is a sheet | seat arrange | positioned so that the surface (surface located in a wearer's skin side at the time of mounting | wearing) may be coat | covered. Since the top sheet needs to allow the wearer's urine or the like to pass therethrough, at least a part (all or a part) of the top sheet is made of a liquid-permeable material.

  Examples of the “liquid permeable material” include woven fabric, non-woven fabric, and porous film. Among these, it is preferable to use a nonwoven fabric made of a thermoplastic resin such as polypropylene, polyethylene, polyester, aliphatic polyamide, etc., which has been subjected to a hydrophilic treatment.

  As the “nonwoven fabric”, a nonwoven fabric produced by a production method such as air through (card hot air) or card embossing can be suitably used. The “hydrophilic treatment” can be performed by applying, spraying, impregnating, etc. a surfactant.

  The top sheet is preferably “at least partly”, more specifically, when the top sheet is viewed in plan, at least the vicinity of the surface of the absorber is made of a liquid-permeable material.

[1-2C] Backsheet:
A backsheet is a sheet | seat arrange | positioned so that the back surface (surface located in the side far from a wearer's skin at the time of mounting | wearing) may be coat | covered. The back sheet is made of a liquid-impermeable material because it is necessary to prevent the wearer's urine from leaking outside the absorbent main body.

  There is no restriction | limiting in particular about the arrangement position of a back seat | sheet. From the viewpoint of preventing leakage of urine absorbed by the absorber, it is preferable that a back sheet is disposed at least in a portion where the absorber exists.

  Examples of the liquid-impermeable material constituting the backsheet include a liquid-impermeable film made of a resin such as polyethylene. Among these, a microporous polyethylene film is preferably used. This microporous polyethylene film has a large number of fine pores of 0.1 to several μm, and is liquid impervious but has moisture permeability, so that the inside of the diaper can be prevented from being steamed There is.

[1-3] Solid gathering:
The disposable diaper of the present invention may include a three-dimensional gather in order to prevent side leakage of urine excreted by the wearer. The three-dimensional gather is a member for preventing side leakage of the urine excreted by the wearer, and is a leak-proof wall configured to stand up three-dimensionally. By forming such a three-dimensional gather, the three-dimensional gather serves as a breakwater, and leakage from a leg-diameter opening or the like (so-called “lateral leakage”) can be effectively prevented.

  The structure used for the conventional disposable diaper can be employ | adopted for the structure of a three-dimensional gather. For example, a stretchable material (a three-dimensional gathered stretchable material) disposed on a part of the water-repellent sheet material and a sheet (gather) formed on the sheet material by the three-dimensional gathered stretchable material can be suitably used. The three-dimensional gather may be formed of a sheet material that is completely different from the top sheet or the back sheet, but may be formed by folding the top sheet or the like.

  In order to prevent leakage from the crotch part, this three-dimensional gather may be formed at least in the crotch part, but may be formed in the front body or the back body. For example, the disposable diaper 1D shown in FIG. 4 is continuous from the crotch part 4 to both the front body 2 and the back body 6 along the longitudinal direction of the diaper (in other words, the entire longitudinal direction of the absorbent main body). An example in which a pair of three-dimensional gathers 26 (26a, 26b) is formed is shown. The three-dimensional gather 26 is configured to be able to stand up three-dimensionally by disposing a three-dimensional gather stretchable material 36 (36a, 36b) on a part of the water-repellent sheet material. It is necessary to form at least one pair of such three-dimensional gathers, but two or more pairs may be formed. Here, FIG. 4 is a schematic plan view showing a state in which still another embodiment of the disposable diaper of the present invention is developed and viewed from the top sheet side. In addition, in the disposable diaper shown in FIG. 4, about the thing comprised similarly to each element of the disposable diaper shown in FIG. 1B, the same code | symbol is attached | subjected and description is abbreviate | omitted.

[1-4] Various elastic materials:
Various elastic materials may be arranged in the disposable diaper of the present invention in order to improve the fit to the wearer's skin. That is, in the disposable diaper of the present invention, the stretchable part is formed by the sheet stacking part and the stretchable material disposed between the sheets constituting the sheet stacking part. Apart from the stretchable part, various stretchable materials may be separately arranged as necessary. Examples of such an elastic material include a leg elastic material, a waist elastic material, and an abdominal elastic material. For example, in FIGS. 1A and 1B, a waist elastic 52 is used as the elastic material 68 at the expansion / contraction part. Can be mentioned.

  The waist circumference elastic material is an elastic material arranged along the waist opening. By arranging the elastic material around the waist, a gather (waist gather) rich in elasticity can be formed in the waist opening. This waist gather makes it difficult for gaps to be formed around the waist, and urine leakage from around the waist can be prevented. Moreover, the fitting property of a diaper becomes favorable and can prevent the diaper slipping down.

  An abdominal circumference elastic material is an elastic material arrange | positioned in the part corresponded to a wearer's abdominal circumference. By arranging the elastic material around the abdomen, it is possible to form a highly elastic tammy gather around the abdomen of the wearer. This Tammy Gather, together with West Gather, can make the diaper fit and anti-slip effect even better.

  The leg-surrounding stretchable material is a stretchable material that is disposed in a stretched state along the leg circumference of the diaper. By arranging the elastic material around the legs, a gather (leg gather) rich in elasticity can be formed around the legs of the diaper. Therefore, it becomes difficult to form a gap around the legs, and urine leakage from around the legs can be effectively prevented.

  In consideration of the degree of gather contraction and the like, these stretchable materials can appropriately set the constituent material, the elongation rate of the material, the stretched state when fixed, and the like.

  As an elastic material, the elastic material used in the conventional disposable diaper can be used suitably. Specific examples include elastic rubber, elastic film, elastic foam (urethane foam, etc.), etc., as well as thread rubber and flat rubber made of elastic materials such as natural rubber and synthetic rubber (urethane rubber, etc.). .

  The stretchable material is preferably fixed in the stretched state in order to exert a sufficient stretch force. For example, when the elastic material is natural rubber or synthetic rubber, it is preferably fixed in a stretched state of 120 to 400%, and more preferably fixed in a stretched state of 200 to 300%. By fixing in the extended state in such a range, it is possible to apply a sufficient expansion / contraction force without applying an excessive tightening force to the wearer.

  The stretchable material can be fixed to other constituent members of the diaper with an adhesive or the like. Specific examples of the fixing method include a method using a hot melt adhesive and other highly fluid adhesives, and a method using heat, ultrasonic waves and the like such as heat sealing.

[2] Disposable diaper manufacturing method:
Hereinafter, as a manufacturing method of the disposable diaper of the present invention, an example in the case of manufacturing the disposable diaper 1A shown in FIGS. 1A to 1D will be described.

  First, an absorbent body, a top sheet that is disposed so as to cover the upper surface side of the absorbent body, at least partially made of a liquid-permeable material, and a liquid that is disposed so as to cover the lower surface side of the absorbent body An absorptive body having a backsheet made of an impermeable material is produced. Such an absorptive main body can be produced in accordance with a conventionally known method for producing an absorptive main body.

  Specifically, first, the absorbent body 22 wrapped with a hydrophilic sheet is placed in the center in the width direction of the back sheet 20. Thereafter, the top sheet 18 is placed so as to cover the absorber 22, and the top sheet 18 and the back sheet 20 are bonded together so that the peripheral edge of the absorber 22 is sandwiched between the top sheet 18 and the back sheet 20. To seal. Thus, the absorptive main body used for the disposable diaper of this invention can be produced.

  Next, two nonwoven fabric sheets (inner sheet 16a and outer sheet 16b) to be the exterior member 16 are prepared, and an abdominal circumference elastic material 54 and a leg circumference elastic material 56 are arranged on the upper surface of the outer sheet 16b. Further, in order to use the elastic material 52 around the waist as the elastic material 68 of the sheet laminated portion 66, the elastic material 68b arranged outside the diaper is arranged as a part of the elastic material 52 around the waist.

  After the outer sheet 16b is laminated with the inner sheet 16a, the side edge portion of the sheet is folded back to form the three-layer structure sheet lamination portion 66. Therefore, the outer sheet 16b has a width corresponding to the formation of the first sheet 66a in FIG. Prepare a wide sheet.

  Moreover, when arrange | positioning an elastic material, a hot-melt-adhesive etc. are apply | coated with respect to each elastic material or the site | part which arranges an elastic material, and the inner sheet | seat 16a and the outer sheet | seat 16b are adhere | attached through an elastic material. Make it possible.

  The inner sheet 16a is laminated and fixed on the upper surface of the outer sheet 16b on which each elastic material (the belly elastic material 54, the leg elastic material 56, and a part of the waist elastic material 52 (elastic material 68b)) is arranged. Thus, a two-layer sheet laminate is obtained in which a part of the waist elastic member 52 (elastic material 68b), the belly elastic material 54, and the leg elastic material 56 are interposed between the two nonwoven fabric sheets. Since the two-layer sheet laminate uses a wide sheet as the outer sheet 16b as described above, the side edge portion of the outer sheet 16b projects outward.

  Next, the protruding portion on the outer side of the outer sheet 16b is folded back on the upper surface of the inner sheet 16a, and the remaining waist is stretched between the folded portion (the protruding portion on the outer side of the outer sheet 16b) and the inner sheet 16a. The material 52 (expandable material 68a) is disposed. At this time, a hot melt adhesive or the like is applied to the stretchable material 68a, and the folded portion and the inner sheet 16a are joined via the stretchable material 68a.

  By forming the exterior body 16 in this manner, the outer sheet 16b becomes the third sheet 66c of the sheet stacking portion 66, the inner sheet 16a becomes the second sheet 66b of the sheet stacking portion 66, and the outer sheet 16b is folded back. The portion becomes the first sheet 66 a of the sheet stacking portion 66.

  When a part of the elastic material 52 around the waist (elastic material 68b) and the remaining elastic material 52 around the waist 52 (elastic material 68a) are disposed between the respective sheets, the elastic material 68b and the elastic material 68a. It is preferable to adjust the interval at which the elastic members 68a and 68b are arranged so that the arrangement positions do not overlap with each other. More preferably, the stretchable materials 68a and 68b are alternately arranged between the first sheet 66a and the second sheet 66b and between the second sheet 66b and the third sheet 66c.

  Next, the already obtained absorbent main body is disposed in the vicinity of the crotch part of the exterior body 16 and fixed. Then, the area | region which forms the leg periphery opening part of an exterior body is excised, and the hole used as a leg periphery opening part later is formed. This hole can be formed by cutting with a cutter having a cutting blade that matches the outer peripheral shape of the hole.

  After that, while the absorbent main body is inside, the front body 2 and the back body 6 are folded in two so that the front body 2 and the back body 6 are matched, and the front body 2 and the back body 6 are bonded by heat sealing or the like to form the joint 8. . In this way, the disposable diaper 1A (pants-type disposable diaper) shown in FIG. 1A can be manufactured.

  The above-described manufacturing method is an example in which the waist stretchable material 52 is the stretchable material 68 disposed in the sheet lamination portion 66, but the case where the belly stretchable material 54 and the leg stretchable material 56 are disposed. In addition, a sheet stacking portion similarly configured by three sheets can be formed.

  Moreover, although the example in the case of forming the sheet | seat lamination | stacking part which consists of an outer sheet-inner sheet-outer sheet by folding up an outer sheet | seat is shown, for example, an inner sheet | seat is folded up on the outer side of a diaper, A sheet lamination portion composed of a sheet and an inner sheet can be formed, and a sheet other than the inner sheet and the outer sheet (a sheet instead of the folded portion of the inner sheet in the above manufacturing method) is separately prepared. It is also possible to form a sheet lamination portion by further disposing on the upper surface of the inner sheet or outer sheet.

  The disposable diaper of the present invention can be suitably used as a diaper for infants or for adults such as elderly people and persons with disabilities who need care.

1A, 1B, 1C, 1D, 100: disposable diapers, 2: front body, 2a, 2b: side edges (side edges of front body), 4: crotch, 6: back body, 6a, 6b: side edges (rear) Side edges of the body), 8: joint, 10, 110: waist opening, 12, 12a, 12b, 112, 112a, 112b: leg opening, 14, 114: absorbent main body, 16, 116: exterior body, 16a, 116a: inner sheet, 16b, 116b: outer sheet, 16X: part of exterior body, 18, 118: top sheet, 20, 120: back sheet, 22, 122: absorber, 26, 26a, 26b: solid Gather, 36, 36a, 36b: Three-dimensional gather elastic material, 52: Elastic material around waist, 54: Elastic material around belly, 56: Elastic material around leg, 66: Sheet lamination part, 66a: First sheet (sheet) 66b: Second sheet (sheet), 66c: third sheet (sheet), 68: elastic member, 68a: one stretchable members, 68b: other stretchable material, 130: elastic material.

Claims (7)

An outer body constituting a front body, a crotch part and a back body of a diaper;
An absorbent body, a top sheet that is disposed so as to cover the upper surface side of the absorbent body, at least partially made of a liquid-permeable material, and a liquid disposed so as to cover the lower surface side of the absorbent body An absorbent main body having a backsheet made of an impermeable material,
At least a part of the exterior body is parallel to each other between a sheet lamination part in which at least three sheets of the first sheet, the second sheet, and the third sheet are laminated, and the sheets constituting the sheet lamination part. A plurality of stretchable materials arranged in an extended state so that the stretched portion is formed in at least a part of the exterior body by the sheet stacking portion and the plurality of stretchable materials,
The plurality of elastic materials arranged in the elastic part are waist elastic materials arranged around the waist of the diaper, and the plurality of elastic materials include at least one elastic material and the first sheet. Each of the stretchable members other than the one stretchable material is disposed between the second sheet and the third sheet, and is disposed between the second sheet and the second sheet. sheet Rutotomoni are bonded to each other via the elastic member disposed between the seat cross, at least two telescoping member of the plurality of stretchable material, and between said first sheet and said second sheet, Disposable diapers arranged alternately between the second sheet and the third sheet .   2. The disposable according to claim 1, wherein at least two of the plurality of elastic members are arranged at intervals so that the arrangement positions of the two elastic materials do not overlap each other between the sheets. Diapers. Each of the interval between the stretchable members disposed between the first sheet and the second sheet and the interval between the stretchable members disposed between the second sheet and the third sheet is 10 mm or more. The disposable diaper according to claim 1 or 2 . The disposable diaper according to any one of claims 1 to 3 , wherein an interval between the plurality of elastic members is 5 to 10 mm. The elastic material arranged between the first sheet and the second sheet and the elastic material arranged between the second sheet and the third sheet are different elastic materials. The disposable diaper as described in any one of Claims 1-4 . The stretchable material disposed between the first sheet and the second sheet, and the stretchable material disposed between the second sheet and the third sheet are disposed in a state of different stretch rates. The disposable diaper as described in any one of Claims 1-5 . Among the elastic materials arranged between the sheets constituting the sheet lamination part, the expansion rate of the elastic material arranged outside the diaper is larger than the expansion rate of the elastic material arranged inside the diaper. The disposable diaper according to claim 6 .

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