JP4248107B2 - Absorbent articles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an absorbent article having excellent leakage prevention properties and good appearance.
[0002]
[Prior art and problems to be solved by the invention]
In general, disposable diapers comprise a liquid-permeable top sheet, a liquid-impermeable leak-proof sheet, and a liquid-retaining absorbent, and are positioned on the abdomen side of the wearer when worn, and a dorsal side part. And a crotch part located between them.
Recently, a so-called pants-type disposable diaper has been proposed in which a side edge on the abdominal side and a side edge on the back side are joined and fixed to each other to form a pair of left and right leg openings and one waist opening. (JP-A 61-207605, etc.).
[0003]
Such a pants-type disposable diaper is characterized in that it can be raised and lowered in the same manner as a normal pant compared to a so-called flat-type diaper. Further, by forming the pair of leg openings and the waist openings so as to be stretchable, the tummy and the suspension can be brought into close contact with the wearer, and the fit can be improved. Moreover, the wearer can usually wear it while standing. For this reason, it is used for various applications such as for yesterday and children who have become active in walking, for toilet training for promoting separation of infants, for incontinent and for walkable adults.
[0004]
For pants-type disposable diapers, it has excellent fit to prevent diaper slipping and prevent excrement from leaking, and also follows the active movement of the wearer It is requested.
In order to meet such demands, so-called pull-up type pants-type diapers are provided with a stretchable side panel in the side portion connecting the back side portion and the abdominal side portion of the main body in Japanese Patent Application Laid-Open No. 2-4364. A pants-type diaper in which an elastic member is disposed in a waist opening of a main body is disclosed.
However, this pant-type diaper can easily create a gap in the waist opening and leg opening, and the side panel can only create inferior elastic stress characteristics, and only the side panel inferior in elastic stress characteristics can be expanded and contracted. In general, the range of size suitability is narrow, and in order to prevent the diaper from falling off, the side panel's stretching stress must be increased, giving the wearer unnecessary pressure and when the diaper is widened. Excessive force was required, and the ease of wiping and ease of wearing could be impaired.
[0005]
In Japanese Patent No. 2340311, a pants-type disposable diaper is proposed in which a gather is formed over the entire circumference of the trunk periphery so that the circumference of the diaper fits the wearer reliably. Since the disposable diaper according to this proposal expands and contracts around the entire circumference, it is possible to widen the size application range of the wearer's torso even if the rubber elongation rate is suppressed to about twice.
Japanese Patent Application Laid-Open No. 7-265357 proposes a pants-type diaper having an elastic member forming a substantially continuous gather on both sides of the waist.
[0006]
As described above, various disposable diapers with gathers formed on the side of the wearer have been proposed, but they still have a wide range of size suitability and excellent ease of use, with an appropriate tightening force. However, there has been no proposal of a suitable fit that is excellent in appearance.
[0007]
Therefore, an object of the present invention is to provide an absorbent article such as a pants-type diaper having a girth gather which ensures a suitable fit with a wide range of size suitability, excellent ease of peeling, and proper tightening force. It is to provide.
[0008]
[Means for Solving the Problems]
The present invention comprises a liquid-permeable surface sheet, a liquid-impermeable leak-proof sheet, and a liquid-holding absorber, and is arranged in the circumferential direction on a trunk periphery located around the wearer's trunk. In the pant-type absorbent article provided with a plurality of waist circumference elastic members, the waist circumference elastic member is in a stretched state so as to exhibit elastic stretchability in a portion where the absorber does not exist , In the portion where the outer layer material forming the outermost surface of the absorbent article and a leak-proof sheet or other sheet material are sandwiched and fixed, and the absorbent body is present, the plurality of elastic members are respectively in the longitudinal direction of the article. It is divided in the direction and is cut without being fixed, substantially elastic elasticity is not expressed and gathers are not formed, and a concealment sheet for concealing the trunk periphery elastic member is provided, Further, the site where the absorber exists In this case, an auxiliary sheet is disposed between the outer layer material and the other sheet material, and the trunk periphery elastic member is located between the auxiliary sheet and the other sheet material, Provided is an absorbent article that is not fixed to the other sheet material but is cut together with the other sheet material, and the concealment sheet is disposed so as to be positioned between the auxiliary sheet and the outer layer material This achieves the object.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of the absorbent article of the present invention will be described in detail.
The disposable diaper 1 as an absorbent article of the present embodiment includes a liquid-permeable surface sheet 2, a liquid-impermeable leak-proof sheet 3, and a liquid-retaining absorbent body 4, as shown in FIGS. And it is the underpants type absorbent article provided with the several trunk periphery part elastic member 9 distribute | arranged toward the circumferential direction in the trunk periphery part D located around a wearer's waist.
[0010]
Specifically, the pants-type disposable diaper 1 of this embodiment is located on the outer side of the absorbent main body 10 having the top sheet 2, the leak-proof sheet 3, and the absorbent body 4, and is absorbed. It consists of the outer layer body 5 which adheres and fixes the sex main body 10.
The basic structure of the disposable diaper of the present invention will be further described. The disposable diaper 1 according to the present embodiment includes an outer layer body 5 having an abdominal side A one side edge A1 and a back side part B one side edge B1. The other side edge A2 of the abdominal side A of the body 5 and the other side edge B2 of the back side part B are joined together to form a waist opening 8 and a pair of leg openings 7. In the present embodiment, two rubbers are disposed as the waist elastic member 81 along the waist opening 8, and three rubbers are disposed as the leg elastic member 71 along the leg opening 7.
[0011]
In addition, on the left and right sides of the absorbent main body 10 in the longitudinal direction, there are provided three-dimensional guards 6 in which three-dimensional guard elastic members 61 are disposed so as to be expandable and contractible near the free ends. Four solid guard elastic members 61 are arranged at predetermined intervals along the longitudinal direction of the absorbent main body 10.
[0012]
Thus, in the disposable diaper 1 of the present embodiment, the waist circumference elastic member 9 is fixed in an expanded state so as to exhibit elastic stretchability in the portion D1 where the absorber 4 does not exist, and the absorber In the site | part D2 in which 4 exists, it is cut | disconnected without being fixed, elastic elasticity is not expressed but a gather is not formed.
[0013]
More specifically, the waist circumference elastic member 9 is formed on the body side of the outer layer material 51 that forms the outermost surface of the disposable diaper in a portion that does not overlap the absorber 4, that is, the portion D1 where the absorber 4 does not exist. The elastic member fixing sheet 52 as another sheet material positioned is sandwiched and fixed via an adhesive. In the site | part D2 in which the absorber 4 exists, it is cut | disconnected with the elastic member fixing sheet 52, without being fixed to another member. That is, in the present embodiment, the outer layer body 5 includes an outer layer material 51 and an elastic member fixing sheet 52. Further, the waist elastic member 81 and the leg elastic member 71 are also sandwiched and fixed by the outer layer material 51 and the elastic member fixing sheet 52 to constitute the outer layer body 5.
[0014]
In the present embodiment, a concealment sheet 53 is used as a concealing means for concealing the cut portions of the trunk periphery elastic member 9 and the elastic member fixing sheet 52 in the portion D2 where the absorber 4 is present in the trunk periphery D. It is arranged on the inner surface side of the outer layer material 51.
Although the elastic member is non-functional in the region D2 where the absorber 4 is present, the trunk periphery elastic member 9 may be seen through the elastic member from the outside, but the concealment sheet 53 is provided. By being done, the piece can be concealed and looks good.
Furthermore, in this embodiment, in the site | part D2 in which the absorber 4 exists, the auxiliary | assistant sheet | seat 54 is distribute | arranged between the outer layer material 51 and the elastic member fixing sheet 52, and the trunk | drum circumference part elastic member 9 is the following. It is located between the auxiliary sheet 54 and the elastic member fixing sheet 52, and the concealment sheet 53 is arranged so as to be located between the auxiliary sheet 54 and the outer layer material 51. The auxiliary sheet 54 is slightly wider than the concealment sheet 53, and the length is substantially the same as the width of the outer layer body 5. Thereby, the trunk periphery elastic member 9 is fixed by the outer layer material 51 and the elastic member fixing sheet 52 via the auxiliary sheet 54.
And the cut | disconnected trunk periphery part elastic member 9 is located in the width direction side part side of the absorber 4 in the contracted state.
Moreover, in this embodiment, since the trunk | drum surrounding part elastic member 9 is distribute | arranged without fixing between each sheet | seat which comprises the outer layer body 5 in the expand | extended state, it is cut | disconnected, The trunk | drum surrounding part elastic member 9 At the time of cutting, the elastic member fixing sheet 52 and the auxiliary sheet 54 are also cut to form a precut opening 55 as shown in FIG.
[0015]
The size of the concealment sheet 53 is preferably such that the precut opening 55 is concealed, and the disordered cut end of the trunk periphery elastic member 9 can be concealed. In the present embodiment, the length is 20 to 150 mm, It is a rectangular shape with a width of 250 to 500 mm. However, the concealment sheet can also serve as a liquid-impermeable sheet, and in this case, a necessary area for the absorber is disposed.
In addition, the concealment sheet 53 is preferably formed by printing such as printing that is visible from the outside during wearing, for example, front-to-back distinction, moisture-permeable display, characters, brand names, disposal means, etc. In the present embodiment, a printed pattern 53a composed of a picture of a rabbit as a character is printed. The printed pattern 53 a is recognized outside through the outer layer material 51. That is, the outer layer material 51 used in the present embodiment is configured so that the printed pattern 53a can be seen through.
When gathers are not formed by the waist circumference elastic member as in the present embodiment, the disadvantage that printing of characters and the like is difficult to see due to gather wrinkles as in conventional absorbent articles is solved.
In addition, one printing pattern 53 a in the present embodiment is provided at the substantially central portion in the longitudinal direction of the concealment sheet 53. As described above, it is preferable that printing is performed with one printing pattern per sheet rather than the continuous pattern 53a because the pattern is not divided in the product and the degree of completion is high in appearance. .
Moreover, when the precut opening 55 arises like this embodiment, when adhering the absorptive main body 10 and the outer layer body 5, it is preferable to consider such as adhering excluding the precut opening 55.
[0016]
As a forming material of the trunk periphery elastic member 9, a known elastic member such as natural rubber, spandex, foam, film type rubber, etc. As a form, a cross-sectionally rectangular, square, circular, polygonal thread or tape Is preferred. An elastic member having a property of being plasticized by heat is also preferably used.
As a material for forming the outer layer material 51, preferably a liquid-resistant, liquid-impermeable, moisture-permeable, and air-permeable, highly flexible sheet that feels close to the underwear, specifically a woven fabric, a non-woven fabric, A film, a moisture permeable film, an apertured film, or a composite material thereof is used.
The material for forming the three-dimensional guard 6 is preferably a liquid-resistant, liquid-impermeable and breathable material.
The material for forming the leak-proof sheet 3 is preferably a material having moisture permeability and air permeability. Moreover, the formation material in particular of the surface sheet 2 and the absorber 4 is not restrict | limited, A well-known material can be especially used without a restriction | limiting.
The material for forming the concealment sheet 53 is a highly flexible sheet that feels close to underwear. Specifically, a woven fabric, a non-woven fabric, a film, a moisture permeable film, an apertured film, paper, or a composite material thereof is used. . Among nonwoven fabrics, meltblown nonwoven fabrics, spunbonded nonwoven fabrics, and combinations of meltblown nonwoven fabrics and spunbonded nonwoven fabrics have high concealability and are particularly preferred, but are not limited thereto. The concealing sheet preferably has a printed pattern on its outer surface.
A material for forming the auxiliary sheet 54 is a highly flexible sheet that feels close to underwear. Specifically, a woven fabric, a nonwoven fabric, a film, a moisture permeable film, an apertured film, paper, or a composite material thereof is used. .
[0017]
The pants-type disposable diaper 1 of this embodiment can be used in the same manner as a normal pants-type disposable diaper.
And since the disposable diaper 1 of this embodiment is comprised as mentioned above, it has a wide size suitability, excellent ease of peeling, an appropriate tightening force, a clean appearance, and an absorber is a pleat. Because it is not moved, the thickness is reduced, the absorber is not pleated, and the absorber does not shrink during wearing, so the absorption performance is maintained even if the required width of the absorber is small. In addition, since the absorber can be made small, the material used can be reduced, the cost can be reduced, and further downsizing can be achieved.
[0018]
The disposable diaper in which the waist gathers are partially arranged as in the present embodiment has the following three advantages.
(1) The absorbent body is not gathered by gathers around the waist, and the width of the absorbent body can be used effectively to fit the wearer.
When the absorbent body is squeezed, the absorbent body width during wearing becomes narrower than the actual absorbent body width, which may reduce the absorbent performance. Moreover, even if the inner diameter of the diaper is matched with the size of the wearer's waist so that the absorbent body is not squeezed, and the elastic member around the waist is stretched almost twice as long, the size of the waist is too small. Since it is configured so that the stress of the elastic member around the waist expresses the maximum value when worn with the maximum inner dimension, it is almost unrealistic. Furthermore, the pleats of the absorbent body cause a stiff feel, and although some improvements can be made with the hot-melt adhesive coating method, the feel cannot be wiped away.
(2) The appearance (appearance) when worn must be clean. This is because pleats disappear from the center of the front and back of the diaper and the appearance is clean.
(3) Since the width of the absorbent body can be narrowed, the materials (nonwoven fabric, carrier tissue, etc.) used for the absorbent body can be reduced, which is effective in reducing costs.
[0019]
First, the disposable diaper 1 of this embodiment creates the absorptive main body 10 according to a conventional method. Further, the trunk periphery elastic member 9 is sandwiched between the elastic member fixing sheet 52 and the auxiliary sheet 54, a predetermined portion is cut, the trunk periphery elastic member 9 is cut, and further concealed outside the auxiliary sheet 54. The sheet 53 is bonded together, and the waist elastic member 81 and the leg elastic member 71 are sandwiched and fixed by the outer layer material 51 and the elastic member fixing sheet 52, and at the same time, both are joined to form the outer layer body 5. It is obtained by joining the outer layer body 5 and the absorbent main body 10 obtained finally, and joining and fixing the left and right side edges of the abdominal part A and the back side part B in the outer layer body 5 to form a pants. .
[0020]
Cutting can be performed using a combination of cutting teeth and receiving teeth such as a rotary die cut, shear cutter, pinch cutter, etc., or cutting means known in the industry such as heat seal cut, ultrasonic seal cut, pressure cut, water jet cutter, etc. it can.
In addition, the cutting can be performed in a state where the trunk periphery elastic member 9 is placed along the auxiliary sheet 54 or the elastic member fixing sheet 52. At that time, the trunk periphery elastic member 9 is temporarily fixed to any material. It is necessary to keep. Alternatively, the auxiliary sheet 53 and the elastic member fixing sheet 52 may be cut immediately before being bonded.
As a cutting method by heat seal cutting, both or one of the pair of rolls is heated and passed through the rolls that are subjected to their own weight or additionally pressure, and the body periphery elastic member 9 at the site to be cut and each of the parts sandwiching the elastic member 9 A method is adopted in which heat and pressure are applied to the sheet in a seal pattern capable of cutting the waist circumference elastic member 9.
The temperature condition of the heat seal roll is in the range of about 50 to 300 ° C., although the optimum condition varies depending on the linear pressure and the linear velocity. A preferable seal pattern is a linear pattern that is minimal to divide the waist circumference elastic member in the non-adhesion region perpendicularly at its substantially central portion.
The plurality of trunk periphery elastic members are each divided in the article longitudinal direction .
[0021]
In addition, this invention is not restrict | limited to the above-mentioned embodiment, In addition to the disposable diaper for adults and children, it is applicable also to a sanitary napkin, an incontinence pad, etc.
Moreover, although the trunk periphery part elastic member 9 illustrated and demonstrated what was arrange | positioned so that elastic stretchability might be expressed in the substantially whole region of the site | part which the absorber 4 does not exist, only a part expresses elastic stretchability. You may do it.
The trunk periphery elastic member 9 may be adhered only to the side part of the front body, or may be adhered only to the side part of the rear body. When the front waist elastic member 9 is bonded only to the side, the appearance of the diaper is clear when viewed from the front, and when it is bonded only to the side of the rear body, it is viewed from behind. There are advantages such as a clean appearance of the diaper, easy adhesion of the tape for disposal, and easy printing.
In the above-described example, the waist circumference elastic member 9 is arranged so as to cross the absorber, but by shortening the length of the absorber or displacing the absorber to the front body, Also, the trunk periphery elastic member 9 can be arranged. As described above, when there is a plurality of waistline elastic members 9 located on the waist opening side of the upper end edge of the absorber (hereinafter referred to as an upper elastic member), the upper elastic member is entirely expanded and contracted. If the extension line is drawn from both side edges of the absorber, the part located inside the two extension lines is made non-stretchable and the part located outside is stretchable It may be arranged as such. The same applies to the waist circumference elastic member disposed in the vicinity of the waist gather.
[0022]
In addition, the trunk periphery elastic member 9 can be fixed using a known means such as heat sealing without any particular limitation without using an adhesive.
In the non-adhesion region of the waist circumference elastic member 9, basically no hot melt adhesive is interposed between the auxiliary sheet 54 and the elastic member fixing sheet 52. In some cases, the adhesive may be applied to a portion where the trunk periphery elastic member 9 does not exist, or an amount of adhesive that may be applied may be applied.
In the above-described embodiment, in order to obtain the desired effect of the present invention, as the most preferable form, the trunk periphery elastic member 9 in the region overlapping with the absorber is all non-stretchable. It suffices that at least a part of the elastic member on the absorber is not stretchable. As for the non-stretchable range, the pants-type diaper for infants has a non-stretchable range of approximately 1/2 or more of the absorbent body width or approximately 1/20 or more and 3/4 or less of the full width of the product. Preferably there is. The adult pants-type diaper preferably has a non-stretchable range of approximately 1/3 or more of the absorber width or approximately 1/20 or more and 3/4 or less of the entire product width.
[0023]
A plurality of elastic members can be further arranged toward the crotch portion C, which is effective in suppressing slippage and improving the appearance.
The trunk periphery elastic member 9 can also be arranged so that the gathers of the trunk periphery D are curved.
The auxiliary sheet 54 may be disposed on the inner surface (body) side of the elastic member fixing sheet 52. At that time, the concealment sheet 53 is disposed outside the elastic member fixing sheet 52.
Note that the precut opening 55 is not generated as in the above-described embodiment, and the trunk periphery elastic member 9 is cut, but the auxiliary sheet 54 and the elastic member fixing sheet 52 are cut so as not to cause any damage. You may go.
Further, the concealment sheet 53 may be arranged outside the outer layer material 51, and in this case, the same effect as that of the above-described embodiment can be achieved.
In the above-described embodiment, an example in which the concealment sheet 53 is separately provided as the concealment unit is illustrated, but the concealment sheet 53 is omitted by using a material having a high concealment property as the outer layer material 51, and the outer layer material 51 itself is concealed. In this case, the outer layer material 51 is preferably printed.
In addition, you may manufacture by cut | disconnecting the trunk | drum surrounding part elastic member 9 previously, and adhere | attaching the cut | disconnected trunk | drum surrounding part elastic member 9 to the site | part D2 in which the absorber 4 does not exist.
[0024]
【The invention's effect】
The absorptive article of the present invention has a girth gather that ensures a suitable fit with a wide range of size suitability, excellent ease of peeling, and proper tightening force, and is excellent in appearance.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a disposable diaper as an absorbent article of the present invention.
FIG. 2 is an exploded perspective view showing a developed state of the disposable diaper shown in FIG. 1;
FIG. 3 is a cross-sectional view taken along line XX of the disposable diaper shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Disposable diaper 10 Absorbent main body 11 Joint part 2 Surface sheet 3 Leak-proof sheet 4 Absorber 5 Outer layer body 51 Outer layer material 52 Elastic member fixing sheet 53 Concealment sheet 54 Auxiliary sheet 55 Precut opening 6 Solid guard 61 Solid guard elastic member 7 Leg Opening 71 leg elastic member 8 waist opening 81 waist elastic member 9 waist circumference elastic member A ventral side B back side C crotch D waist circumference

Claims (1)

A plurality of trunks arranged in a circumferential direction around a waist of a wearer, including a liquid-permeable surface sheet, a liquid-impermeable leak-proof sheet, and a liquid-holding absorber. In a pants-type absorbent article provided with a surrounding elastic member,
In the region where the absorber does not exist, the trunk periphery elastic member includes an outer layer material that forms an outermost surface of the absorbent article in a stretched state so as to exhibit elastic stretchability, and a leak-proof sheet or In a portion that is sandwiched and fixed by another sheet material and the absorber is present, the plurality of elastic members are divided in the longitudinal direction of the article and cut without being fixed, and substantially elastically stretchable The material is not expressed and gathers are not formed, and a concealment sheet for concealing the trunk periphery elastic member is provided,
Moreover, in the site | part in which the said absorber exists, the auxiliary | assistant sheet | seat is distribute | arranged between the said outer layer material and the said other sheet | seat material, The said trunk | drum periphery elastic member is the said auxiliary | assistant sheet | seat and the said other sheet | seat The concealment sheet is disposed so as to be positioned between the auxiliary sheet and the outer layer material, and is cut together with the other sheet material without being fixed to the other sheet material. Absorbent articles that have been .

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