JP2013255847A - Disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent excrement from scattering when eliminating the excrement from a diaper.SOLUTION: In a disposable diaper, a free part of a three-dimensional gather 60 has a double structure which has: an inner wall part 60i exposed to a central side in a width direction; and an outer wall part 60x positioned outside in the width direction of the inner wall part 60i and fixed to the inner wall part 60i. A gather elastic expandable member 63 is put between the inner wall part 60i and the outer wall part 60x, is fixed to both of the inner wall part 60i and to the outer wall part 60x, and is provided with a cover sheet 70 so as to cover a range from a position, in the middle in the height direction of at least the inner wall part 60i or on a side below it, to a boundary between the inner wall part 60i and the outer wall part 60x of the free part of the three-dimensional gather 60. In the cover sheet 70, a lower end part of a part positioned on the center side in the width direction of the inner wall part 60i is fixed to an adjacent member, and parts other than the fixed part is integrated with respect to the free part of the three-dimensional gather 60 so that they can be releasable.

Description

  The present invention relates to a disposable diaper having a three-dimensional gather.

  In the disposable diaper, in order to improve the fit with respect to the leg circumference, it is common that the three-dimensional gathers projecting to the body side extend in the front-rear direction on both sides in the width direction on the inner surface (for example, Patent Documents). 1). By providing such a three-dimensional gather, excrement remains between the compatible body gathers, and in particular, leakage of excrement from the wearer's leg periphery is prevented.

  As shown in FIG. 15, a general three-dimensional gather 60 has a root portion 65 fixed to a side portion of the diaper (the back surface in the illustrated example) and an extending portion 66 extending from the root portion 65. In the extended portion 66, both end portions 67 (see FIGS. 1 and 4) in the front-rear direction are bonded and fixed to the surface of the top sheet 30, and the intermediate portion is an unfixed free portion. The gather elastic elastic member 63 made of an elongated elastic elastic member is fixed in an extended state along the front-rear direction at least at the front end of the part, so that the free part is on the surface of the top sheet 63 by the contracting action of the gather elastic elastic member 63. It comes to stand up from. In addition, the shaded part (dotted pattern part) in FIG. 15 indicates an adhesive fixing part, the reference numeral 56 indicates an absorber, the reference numeral 11 indicates a liquid-impermeable sheet, and the reference numeral 62 indicates a gather sheet.

  Further, in the three-dimensional gather 60 shown in FIG. 15, the extension portion 66 is folded back outward in the width direction from the base end side portion extending from the root portion 65 toward the center in the width direction and the tip of the base end side portion. Line contact type that is a surface contact type three-dimensional gather that consists of a distal end portion, the proximal end portion functions as a blocking wall, and the distal end portion is in contact with the body. 3D gathers (not shown) are also widely used.

JP 2001-178770 A Japanese Patent Laid-Open No. 5-3889

When discarding used disposable diapers, due to hygienic problems, odor problems, and the like, it is common to remove the feces that can be removed and then to roll them out.
However, when flushing the toilet to the toilet, turning the diaper upside down on the toilet, turning it upside down, shaking it up and down, etc., and dropping the toilet by gravity, etc. The floor may be soiled and the mother's clothes and face may stool.
Then, the main subject of this invention is in suppressing the scattering of the flight at the time of removing a flight from a diaper.

  As a result of the present inventors diligently researching the above problems, as shown in FIG. 16, the stool 90 arrived at the three-dimensional gather 60 is repelled by the reversing centrifugal force of the three-dimensional gather 60 when turning the diaper upside down, It has been found that the fact that the flight of the stool 90 scatters in the lateral direction instead of the downward direction is one of the causes of the stool 90 scattering. The following present invention has been made based on such findings.

<First Reference Form>
With a liquid-permeable top sheet, a liquid-impermeable back side sheet, and an absorber interposed between these sheets,
On each side in the width direction, each has a three-dimensional gather extending along the front-rear direction from the front side of the crotch part to the rear side of the crotch part,
The three-dimensional gather has a root portion fixed to both sides of the diaper and an extending portion extending from the root portion, and both end portions in the front-rear direction of the extending portion are fixed in a lying state. In addition, the middle part is an unfixed free part, and a gather elastic elastic member made of an elongated elastic elastic member along the front-rear direction is fixed in an extended state at least at the tip of the free part.
In disposable diapers,
The free part of the three-dimensional gather has an inner wall part exposed on the center side in the width direction, and an outer wall part located on the outer side in the width direction of the inner wall part and fixed to the inner wall part so as not to be fixed or peelable. The gather elastic elastic member is passed between the inner wall portion and the outer wall portion and fixed to the outer wall portion and fixed to the inner wall portion so as to be non-fixed or peelable.
A perforation along the front-rear direction is provided between the fixed position of the uppermost gather elastic elastic member in the outer wall and the boundary between the outer wall and the inner wall.
A disposable diaper characterized by that.

(Function and effect)
When discarding diapers with stool attached, if stool is attached to the inside of the three-dimensional gather (may be other cases), tear the perforation and turn it over and turn it over. Although the outer stool adhesion part (the part where stool is difficult to adhere) is reversed by the contraction force of the gather elastic elastic member, the stool easy adhesion part (the part where stool is easy to adhere) inside the perforation is gather elastic expansion and contraction. Since the member is not fixed, it hangs down without being inverted. Therefore, a situation in which the attached stool is bounced and scattered by the centrifugal force of the reversal of the three-dimensional gather is prevented.

<Second Reference Form>
The disposable diaper of the 1st reference form by which the perforation is provided in the position where the gather elastic elastic member in the outer wall part was fixed.

(Function and effect)
In this case, there is an advantage that the perforation can be automatically torn by picking and pulling the gather elastic elastic member, and the hand is not easily soiled when the perforation is torn.

<Invention of Claim 1>
With a liquid-permeable top sheet, a liquid-impermeable back side sheet, and an absorber interposed between these sheets,
On each side in the width direction, each has a three-dimensional gather extending along the front-rear direction from the front side of the crotch part to the rear side of the crotch part,
The three-dimensional gather has a root portion fixed to both sides of the diaper and an extending portion extending from the root portion, and both end portions in the front-rear direction of the extending portion are fixed in a lying state. In addition, the middle part is an unfixed free part, and a gather elastic elastic member made of an elongated elastic elastic member along the front-rear direction is fixed in an extended state at least at the tip of the free part.
In disposable diapers,
The free portion of the three-dimensional gather has a double structure having an inner wall portion exposed on the center side in the width direction and an outer wall portion positioned outside the inner wall portion in the width direction and fixed to the inner wall portion. The gather elastic elastic member is sandwiched between the inner wall portion and the outer wall portion, and is fixed to both the inner wall portion and the outer wall portion,
Of the free part of the three-dimensional gather, a cover sheet is provided so as to cover at least the middle in the height direction of the inner wall part or a position below this from the boundary between the inner wall part and the outer wall part,
In this cover sheet, the lower end portion of the portion located on the center side in the width direction of the inner wall portion is fixed to the adjacent member, and the portions other than the fixing portion are integrated so as to be peelable from the free portion of the three-dimensional gather. ing,
A disposable diaper characterized by that.

(Function and effect)
In the first reference form, the gather sheet is divided at the perforation, so that when the diaper is turned over, the convenience depositing portion is set as a non-inverted portion and the toilet deposit attached portion is set as the inverted portion. There is a risk that the gather elastic elastic member will be insufficiently fixed, and the gather elastic elastic member may be released. On the other hand, in the present invention, since the gather elastic elastic member is sandwiched between the inner wall part and the outer wall part, and is based on a general structure fixed to both the inner wall part and the outer wall part, the gather elastic elastic member There is no risk of unfastening.
And when discarding the diaper with stool attached, if the stool is attached to the inside of the three-dimensional gather (other cases may be used), the diaper is peeled off from the three-dimensional gather except for the fixing part of the cover sheet. By turning the inside upside down, the three-dimensional gather which is the stool adhesion part covered by the cover sheet is inverted by the contraction force of the gather elastic elastic member, but the cover sheet which is the stool adhesion part hangs down without being inverted. It becomes like this. Therefore, also in the present invention, it is possible to prevent the situation where the attached stool is bounced and scattered by the centrifugal force of the reversal of the three-dimensional gather.

<Third Reference Form>
With a liquid-permeable top sheet, a liquid-impermeable back side sheet, and an absorber interposed between these sheets,
On each side in the width direction, each has a three-dimensional gather extending along the front-rear direction from the front side of the crotch part to the rear side of the crotch part,
The three-dimensional gather has a root portion fixed to both sides of the diaper and an extending portion extending from the root portion, and both end portions in the front-rear direction of the extending portion are fixed in a lying state. In addition, the middle part is an unfixed free part, and a gather elastic elastic member made of an elongated elastic elastic member along the front-rear direction is fixed in an extended state at least at the tip of the free part.
In disposable diapers,
The free part of the three-dimensional gather has an inner wall part exposed on the center side in the width direction, and an outer wall part located on the outer side in the width direction of the inner wall part and fixed to the inner wall part so as not to be fixed or peelable. The gather elastic elastic member is passed between the inner wall portion and the outer wall portion and fixed to the inner wall portion and fixed to the outer wall portion so as to be non-fixed or peelable.
A perforation along the front-rear direction is provided in the middle of the height direction in the outer wall part or on the lower side thereof,
A disposable diaper characterized by that.

(Function and effect)
In the third embodiment, first, the perforation is torn, the stool attachment portion outside the perforation is folded back to the inside of the three-dimensional gather and the inner wall portion is covered, and then the diaper is turned upside down and turned upside down. Although the whole is reversed by the contraction force of the gather elastic elastic member, the portion of the inner wall portion attached to the convenience is reversed while being covered with the outer wall portion. Therefore, also in this embodiment, a situation in which the attached stool is bounced and scattered by the centrifugal force of reversing the three-dimensional gather is prevented.

<Invention of Claim 2>
The three-dimensional gather extends from the back side of the absorber to the side of the absorber and extends to the side of the top sheet, and is adjacent to the front side of the portion located on the back side of the absorber The disposable diaper of Claim 1 which has a root part fixed to the member to do.

(Function and effect)
In a three-dimensional gather having such a structure, particularly in a disposable diaper, when the diaper is turned upside down, the turning radius in the reversal of the three-dimensional gather increases, and the centrifugal force acting on the attached stool increases. Therefore, this invention is a disposable diaper provided with such a three-dimensional gather. It is suitable for.

  As described above, according to the present invention, there are advantages such as suppression of stool scattering when removing stool from a diaper.

It is a top view in the state where the diaper was developed showing the inside of a pants type disposable diaper. It is a top view in the state where the diaper was developed showing the outer surface of a pants type disposable diaper. FIG. 3 is a 3-3 cross-sectional view of FIG. 1. FIG. 4 is a sectional view taken along the line 4-4 in FIG. 1. FIG. 5 is a sectional view taken along line 5-5 in FIG. 1. It is a top view in the state where the diaper was developed showing only the principal part of a pants type disposable diaper. It is sectional drawing which shows only the principal part of a pants type disposable diaper. It is a perspective view of a pants type disposable diaper. It is sectional drawing which shows the state which turned the diaper upside down and turned it upside down. It is sectional drawing equivalent to the 3-3 cross section of FIG. 1 which shows another form. It is sectional drawing which shows the state which turned the diaper upside down and turned it upside down. It is sectional drawing equivalent to the 3-3 cross section of FIG. 1 which shows another form. It is sectional drawing which shows a preliminary work stage. It is sectional drawing which shows the state which turned the diaper upside down and turned it upside down. It is sectional drawing equivalent to the 3-3 cross section of FIG. 1 which shows the conventional form. It is sectional drawing which shows the state which turned the conventional diaper upside down and turned it upside down.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
<Reference form>
1 to 8 show an example 100 of a pants-type disposable diaper. The pants-type disposable diaper 100 includes an exterior sheet 12 that forms the outer surface (rear surface) of the product and an interior body 200 that is attached to the inner surface of the exterior sheet 12. Symbol Y indicates the total length of the diaper in the deployed state (the length in the vertical direction from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the back body B), and symbol X indicates the diaper in the deployed state. The full width of is shown.

  The interior body 200 is a part that absorbs and holds excrement such as urine, and the exterior sheet 12 is a part that is worn by the wearer. In addition, the dot pattern part in sectional drawing has shown the junction part which joins each structural member, and is formed by solid, beads, curtains, summits, spiral application, etc., such as a hot-melt-adhesive. In addition, “front-rear direction” means a direction connecting the ventral side (front side) and the back side (rear side), “width direction” means a direction (left-right direction) perpendicular to the front-rear direction, and “up-down direction Is the wearing state of the diaper 100, that is, the direction perpendicular to the waistline direction when the diaper 100 is folded in two at the crotch so that both sides of the front body and the back body of the diaper 100 overlap each other, in other words It means the direction connecting the waist opening WO side and the crotch part side.

(Exterior sheet)
The exterior sheet 12 has a part constituting the front body F extending from the crotch part to the ventral side and a part constituting the rear body B extending from the crotch part to the back side, and both sides of the front body F As shown in FIG. 8, a waist opening WO for passing the wearer's torso and a pair of left and right leg openings LO for passing the legs are formed. It is what. Reference numeral 12A denotes a joining portion (hereinafter, this portion is also referred to as a side seal portion). The crotch portion means the center in the front-rear direction from the waist edge of the front body F to the waist edge of the back body B in the unfolded state, and the front part and the back part thereof are the front body F and Each back body B is meant.

  The exterior sheet 12 includes a waistline portion T defined as a front-rear direction range extending from the waist opening WO to the upper end of the leg opening LO, and a front-rear direction range of the portion forming the leg opening LO (the side seal portion 12A of the front body F). And an intermediate portion L defined as a front-rear direction region having a side seal portion 12A of the back body B. The waistline T can be divided into a “waist edge” W that conceptually forms the edge of the waist opening, and a “waist lower part” U that is a lower part than this. These lengths in the vertical direction vary depending on the size of the product and can be determined as appropriate. For example, the waist edge W may be 15 to 40 mm, and the waist lower portion U may be 65 to 120 mm. On the other hand, both side edges of the intermediate portion L are bundled along the circumference of the wearer's leg, and this is a portion into which the wearer's leg is put. As a result, the exterior sheet 12 has a substantially hourglass shape as a whole. The degree of tightness of the exterior sheet 12 can be determined as appropriate, and, as shown in FIGS. 1 to 8, the narrowest part may be narrower than the width of the interior body 200 in order to obtain a clean appearance. Although it is preferable, the narrowest part may be determined so as to be equal to or larger than the width of the interior body 200.

  As shown in FIGS. 3 to 5, the exterior sheet 12 is formed by bonding two sheet base materials 12 </ b> S and 12 </ b> H with an adhesive such as a hot melt adhesive, and is located on the inner side. Although the base material 12H extends only to the edge of the waist opening WO, the outer sheet base material 12S wraps around the waist side edge of the inner sheet base material 12H and is folded back to the inside. 12r is extended so that it may coat | cover up to the waist side edge part of the interior body 200. FIG.

The sheet base materials 12S and 12H can be used without particular limitation as long as they are in sheet form, but are preferably non-woven fabrics. The nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. When using a nonwoven fabric, it is preferable that the basic weight shall be about 10-30 g / m < ² >.

Moreover, it is preferable that the total basis weight of the exterior sheet 12 is about 20 to 60 g / m ² so that the design of the printing sheet 25 to be described later can be satisfactorily viewed from the outer surface of the product through the exterior sheet 12. The total light transmittance specified in 7105 is preferably 40% or more, particularly 50% or more.

  The exterior sheet 12 is provided with elongate elastic members 15 to 19 such as thread rubber at a predetermined elongation rate between the sheet bases 12S and 12H in order to improve the fit to the waistline. As the elongated elastic elastic members 15 to 19, synthetic rubber or natural rubber may be used. For bonding the sheet bases 12S and 12H of the exterior sheet 12 and fixing the elongated elastic members 15 to 19 sandwiched therebetween, hot melt bonding or heat sealing or ultrasonic bonding by various coating methods is used. Can do. If the entire exterior sheet 12 is firmly fixed, the texture of the sheet is impaired, which is not preferable. By combining these, it is preferable that the elongated elastic elastic members 15 to 19 are firmly bonded, and other portions are not bonded or bonded weakly.

More specifically, the entire width direction is continuous between the inner surface of the inner sheet base 12H and the outer surface of the folded portion 12r of the outer sheet base 12S at the waist edge W of the rear body B and the front body F. As described above, the plurality of waist edge elastic elastic members 17 are fixed in a state of being spaced apart in the vertical direction and extended along the width direction at a predetermined extension rate. In addition, one or more of the waist edge elastic elastic members 17 disposed in a region adjacent to the waist lower portion U may overlap with the interior body 200 or may be overlapped with the interior body 200 in the width direction. You may each provide in the width direction both sides except a center part. The waist edge elastic elastic member 17 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to the rubber thread of 1.0mm about ^2), 3 to 22 present approximately at intervals of 4 to 12 mm, respectively elongation from 150% to 400%, preferably fixed in particular about 220-320%. Further, the waist edge elastic elastic members 17 need not all have the same thickness and elongation rate. For example, the elastic elastic members may have different thicknesses and elongation rates at the upper and lower portions of the waist edge W. .

  Further, between the outer side surface of the inner sheet base 12H and the inner side surface of the outer sheet base 12S in the lower waist U of the front body F and the rear body B, except for the widthwise central portion overlapping the interior body 200, A plurality of waist lower elastic elastic members 15, 19 made of an elongated elastic elastic member are continuously provided over the entire width direction on each of the upper side and both sides in the width direction, with a predetermined interval in the vertical direction It is fixed in an expanded state along the width direction at an expansion rate.

The waist lower elastic elastic members 15 and 19 have a thickness of 155 to 1880 dtex, especially about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to It is preferable to fix the thread rubber of about 1.0 mm ² ) at an interval of 1 to 15 mm, particularly 3 to 8 mm, and about 5 to 30 at an elongation of 200 to 350%, particularly about 240 to 300%.

  Moreover, between the outer side surface of the inner sheet base material 12H and the inner side surface of the outer sheet base material 12S in the intermediate part L of the front body F and the back body B, except for the center part in the width direction overlapping the interior body 200, A plurality of intermediate elastic expansion / contraction members 16 made of an elongated elastic expansion / contraction member are provided in each part on both sides in the width direction so as to be continuous over the entire width direction. It is fixed in a stretched state along the direction.

The intermediate elastic elastic members 16 and 18 have a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber. In the case of natural rubber, the cross-sectional area is 0.05 to 1.5 mm ² , particularly 0.1 to It is preferable to fix the thread rubber of about 1.0 mm ² ) at an interval of 5 to 40 mm, particularly 5 to 20 mm, and about 2 to 10 at an elongation of 150 to 300%, particularly 180 to 260%.

  As shown in the figure, when the waist lower elastic elastic member and the intermediate elastic elastic members 15, 19, 16, 18 are respectively provided on both sides in the width direction except for the central portion in the width direction overlapping the interior body 200. The interior body 200 does not shrink more than necessary in the width direction, so that it does not look bad or absorbs. In this form, in addition to the form in which the elastic stretchable member exists only on both sides in the width direction, the elastic stretchable member exists from one side of the width direction to the other side across the interior body 200, but overlaps the interior body 200. At the center in the width direction, the elastic expansion / contraction member is finely cut, and the contraction force does not act (substantially equivalent to not providing the elastic expansion / contraction member), and only the both sides in the width direction are configured as the contraction force acting portions. Are also included. Of course, the arrangement of the waist lower elastic members 15, 19, 16, and 18 is not limited to the above example, and the waist lower portion so that the elastic force acts on the entire width of the waist lower U. A part or all of the elastic elastic member and the intermediate elastic elastic members 15, 19, 16, 18 can be provided across the interior body 200 from one side in the width direction to the other side.

  In addition, when the elongated elastic elastic members 15 to 19 of each part cross a printing sheet 25 described later, when rubber containing titanium oxide is used as the elongated elastic elastic members 15 to 19, the content of titanium oxide is It is preferable to use a low one (for example, 2% or less) or one containing no titanium oxide.

(Post-processing tape)
A post-processing tape 70 (fixing means) can be provided at the center in the width direction on the outer surface of the rear body B of the exterior sheet 12. The post-processing tape 70 is for fixing the diaper 100 in a state where the diaper 100 is rolled or folded so that the topsheet 30 is on the inside and the front body F is on the inside. As shown in FIG. 5, in the general post-processing tape 70, a base end portion 71 is fixed to the outer surface of the exterior sheet 12 with an adhesive or the like, and a portion on the front end side of the base end portion 71 is tri-folded. (Folded in a Z-shaped cross section) or folded in half, and the portion between the folded portions is fixed (temporarily fixed) by the temporary fixing adhesive 72 so as to be peelable. Moreover, while having the knob | pick part 73 colored in opaque colors, such as white, in the front-end | tip part, the part except this knob | pick part 73 is transparent or semi-transparent, Through the transparent or semi-transparent part in this post-processing tape 70, A design to be described later is visible from the outer surface side of the post-processing tape 70. Although a specific structure can be appropriately configured, in the illustrated embodiment, the whole is formed by connecting a plurality of transparent or semi-transparent substrates in the longitudinal direction, and a colored tape 74 is bonded to the knob 73. Is adopted.
At the time of disposal, the diaper 100 is rolled or folded so that the topsheet 30 is on the inside and the front body F is on the inside, and then the folded portion of the post-processing tape 70 is peeled off and spread, and the diaper 100 is rolled or folded. The diaper 100 is fixed with an adhesive so as to be wound from the rear body B of the diaper 100 to the outer surface on the opposite side over the waist opening WO. The post-processing tape 70 is particularly preferably a tri-fold shape that can be folded compactly when not in use and can be expanded into a long shape when in use.
Fixing means such as the post-processing tape 70 may be provided on the front body F or on both the back body B and the front body F.

(Print sheet)
Between the liquid-impermeable back sheet 11 and the exterior sheet 12 (including the interlayer of the exterior sheet 12), a print sheet 25 that is designed by printing is provided. The exterior sheet 12 may be omitted, and the print sheet 25 may be exposed on the outer surface. The printed sheet 25 in the illustrated example has a smaller area than the body on which the printed sheet 25 is disposed, and is provided separately for the front body F and the back body B, but passes through the crotch from the front body F. It can also be provided so as to continue to the back body B integrally.
Although the size and shape of the printing sheet 25 are not particularly limited, it is preferable to sufficiently increase the area in order to make the function sufficient. For example, the width of the printing sheet 25 is 50 to 120 of the width of the absorber 56. The length of the printing sheet 25 is preferably about 15 to 30% of the total length Y of the article on at least one side of the stomach side and the back side. Further, the shape of the print sheet 25 is preferably a rectangle as shown in the figure in that trim loss does not occur. However, the print sheet 25 has a geometric shape such as a circle, an ellipse, a triangle, a hexagon, or a shape along the periphery of the design. You may cut it.
As the sheet base material of the printing sheet 25, a plastic film, non-woven fabric, paper, or the like can be used, but a bulky material having high air permeability is preferable. When using a plastic film, it is desirable to have moisture permeability in order to prevent stuffiness. Nonwoven fabrics and paper are preferable because they have moisture permeability, and when performing design printing, it is preferable to use nonwoven fabrics that are smooth and easy to print, and papers that are high in strength and difficult to bleed ink. Particularly preferred are basis weight 15 to 35 g / m ² approximately, crepe paper having a thickness of about 0.1 to 0.3 mm (thin paper) and a basis weight 10 to 25 g / m ² approximately, a thickness of about 0.1 to 0.3 mm Non-woven fabrics (especially spunbond nonwoven fabrics and SMS nonwoven fabrics having a spunbond portion having a fineness of about 1.0 to 3.0 dtex). When crepe paper is used, the crepe rate is preferably about 5 to 20%, particularly about 5 to 15%. If the crepe rate is 20% or more, the amount of ink fixed increases, but blurring occurs and is not suitable for design printing. If the crepe rate is 5% or less, the amount of fixing is small because the ink hardly penetrates.

(Exterior sheet split structure)
In the above-described example, the front body F to the back body B are continuously covered with the integral exterior sheet 12, but the exterior sheet covers the stomach side of the wearer's waist and the back side The front end portion of the interior body is connected to the inner surface of the center portion in the width direction of the abdominal side exterior sheet with a hot melt adhesive or the like, and the center portion in the width direction of the back side exterior sheet. The rear end of the interior body is connected to the inner surface by a hot melt adhesive or the like, and the form in which the abdominal exterior sheet and the back exterior sheet are not continuous on the crotch side and are separated from each other may be adopted. it can. This separation distance can be about 150 to 250 mm. In this case, on the back surface of the liquid-impermeable back sheet in the interior body, so as to cover the entire back surface of the interior body, or so as to cover the entire portion exposed between the abdominal exterior sheet and the back exterior sheet, The crotch outer sheet can also be fixed. As the crotch outer sheet, the same material as that used for the outer sheet described above can be used. The crotch outer sheet also corresponds to the outer sheet.

(Interior body)
The interior body 200 can take any shape, but is rectangular in the illustrated form. As shown in FIGS. 3 to 5, the interior body 200 includes a surface sheet 30 on the body side, a liquid-impermeable back sheet 11, and an absorbent element 50 interposed therebetween. It is the main body that takes up the absorption function. Reference numeral 40 in FIG. 3 indicates an intermediate sheet (second sheet) provided between the top sheet 30 and the absorbent element 50 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorbent element 50. Reference numeral 60 denotes a three-dimensional gather 60 that is provided on both sides of the interior body 200 and stands on the body side in order to prevent excrement from leaking on both sides of the interior body 200.

(Surface sheet)
The top sheet 30 has a property of transmitting liquid, and examples thereof include a porous or non-porous nonwoven fabric, a porous plastic sheet, and the like. Of these, the nonwoven fabric is not particularly limited as to what the raw fiber is. For example, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and polyamides, recycled fibers such as rayon and cupra, natural fibers such as cotton, and mixed fibers and composite fibers using two or more of them. Etc. can be illustrated. Furthermore, the nonwoven fabric may be manufactured by any processing. Examples of the processing method include known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, and a point bond method. For example, if flexibility and drapeability are required, the spunbond method and spunlace method are preferable. If bulkiness and softness are required, the air-through method, point bond method, and thermal bond method are preferable processing methods. .
Further, the top sheet 30 may be composed of one sheet or may be composed of a laminated sheet obtained by bonding two or more sheets. Similarly, the top sheet 30 may be composed of one sheet or two or more sheets in the planar direction.
When the three-dimensional gather 60 as shown in the illustrated example is provided, both sides of the top sheet 30 pass between the liquid-impervious back sheet 11 and the three-dimensional gather 60 to the back side of the absorbent element 50 to permeate the liquid. In order to prevent this, it is preferable to adhere to the liquid-impermeable back sheet 11 and the three-dimensional gather 60 with a hot melt adhesive or the like.

(Intermediate sheet)
An intermediate sheet (also referred to as “second sheet”) 40 having a higher liquid permeation rate than the top sheet 30 can be provided to quickly transfer the liquid that has passed through the top sheet 30 to the absorber. This intermediate sheet 40 not only improves the absorption performance of the absorbent by quickly transferring the liquid to the absorbent body, but also prevents the “reversed” phenomenon of the absorbed liquid from the absorbent body, so that the top sheet 30 is always dried. It can be made into the state which carried out. The intermediate sheet 40 can be omitted.
Examples of the intermediate sheet 40 include the same material as the top sheet 30, spunlace, spunbond, SMS, pulp nonwoven fabric, mixed sheet of pulp and rayon, point bond, or crepe paper. In particular, an air-through nonwoven fabric is preferable because it is bulky. It is preferable to use a core-sheath composite fiber for the air-through nonwoven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. Basis weight is preferably ^{20~80g / m 2, 25~60g / m} 2 is more preferable. The thickness of the raw fiber of the nonwoven fabric is preferably 2.2 to 10 dtex. In order to make the nonwoven fabric bulky, it is also preferable to use an eccentric fiber, a hollow fiber, or an eccentric and hollow fiber that does not have a core at the center as the mixed fiber of all or part of the raw fiber.
The intermediate sheet 40 in the illustrated form is disposed in the center shorter than the width of the absorber 56, but may be provided over the entire width. The length of the intermediate sheet 40 in the longitudinal direction may be the same as the length of the absorbent body 56 or may be within a short length range centered on the region that receives the liquid.

(Impermeable liquid back sheet)
The material of the liquid-impermeable back sheet 11 is not particularly limited. For example, a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated nonwoven fabric in which a plastic film is provided on the surface of the nonwoven fabric, or plastic Examples thereof include a laminated sheet in which a nonwoven fabric or the like is laminated on a film and joined. For the liquid-impermeable back sheet 11, it is preferable to use a liquid-impervious and moisture-permeable material that has been preferred in recent years from the viewpoint of preventing stuffiness. As a plastic film having moisture permeability, a microporous plastic film obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching in a uniaxial or biaxial direction. Is widely used. In addition, non-woven fabric using micro-denier fibers, leakproof reinforcement by reducing the voids of the fibers by applying heat or pressure, and methods such as applying a superabsorbent resin or hydrophobic resin or water repellent Accordingly, a sheet that is liquid-impermeable without using a plastic film can also be used as the liquid-impermeable back sheet 11.
The liquid-impermeable back sheet 11 is preferably extended to both sides of the side surface 30 of the absorbent element 50 by wrapping around both sides of the absorbent element 50 in order to improve leakage resistance. The width of this extended portion is suitably about 5 to 20 mm on each of the left and right sides.
Moreover, the excretion indicator from which a color changes by absorption of a liquid part can be provided in the inner side of the liquid-impermeable back sheet 11, especially the absorber 56 side surface.

(Absorption element)
The absorbent element 50 includes an absorbent body 56 and a packaging sheet 58 that wraps the entire absorbent body 56. The packaging sheet 58 can be omitted.

(Absorber)
The absorber 56 can be formed of an aggregate of fibers. As this fiber assembly, a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate as well as short fibers such as cotton-like pulp and synthetic fibers Can also be used. The fiber basis weight can be set to, for example, about 100 to 300 g / m ² when cotton-like pulp or short fibers are stacked, and in the case of a filament aggregate, for example, about 30 to 120 g / m ^2. Can do. The fineness in the case of a synthetic fiber is 1-16 dtex, for example, Preferably it is 1-10 dtex, More preferably, it is 1-5 dtex. In the case of a filament aggregate, the filament may be a non-crimped fiber, but is preferably a crimped fiber. The crimped degree of the crimped fiber can be, for example, 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. Further, a crimped fiber that is uniformly crimped is often used. It is preferable to disperse and hold superabsorbent polymer particles in the absorber 56.
Although the absorbent body 56 may be rectangular, as shown in FIG. 6, as shown in FIG. 6, the hourglass has a front end portion, a rear end portion, and a narrow portion narrower than the front end portion and the rear end portion. When the shape is formed, it is preferable because the fit of the absorber 56 itself and the three-dimensional gather 60 around the legs is improved.
Moreover, although the dimension of an absorber can be determined suitably, it is preferable to extend to the peripheral part of the interior body, or its vicinity in the front-back direction and the width direction. Reference numeral 56X indicates the width of the absorber 56.

(Superabsorbent polymer particles)
The absorber 56 can contain superabsorbent polymer particles in a part or all thereof. Superabsorbent polymer particles include “powder” in addition to “particles”. As the superabsorbent polymer particles 54, those used for this type of absorbent article can be used as they are, for example, by sieving (shaking for 5 minutes) using a 500 μm standard sieve (JIS Z8801-1: 2006). The ratio of particles remaining on the sieve is preferably 30% by weight or less, and the ratio of particles remaining on the sieve by sieving (shaking for 5 minutes) using a 180 μm standard sieve (JIS Z8801-1: 2006). Is preferably 60% by weight or more.
The material of the superabsorbent polymer particles can be used without any particular limitation, but those having a water absorption (JIS K7223-1996 “Test method for water absorption of superabsorbent resin”) of 40 g / g or more are preferable. High-absorbent polymer particles include starch-based, cellulose-based, and synthetic polymer-based starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and sodium carboxymethylcellulose crosslinks. Or an acrylic acid (salt) polymer can be used. As the shape of the superabsorbent polymer particles, a commonly used granular material is suitable, but other shapes can also be used.
As the superabsorbent polymer particles, those having a water absorption rate (JIS K7224-1996 water absorption rate test method for superabsorbent resin) of 40 seconds or less are preferably used. When the water absorption speed exceeds 40 seconds, so-called reversion in which the liquid supplied into the absorber 56 returns to the outside of the absorber 56 is likely to occur.
Further, as the superabsorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. Thereby, even if it is a case where it is set as the bulky absorber 56, the sticky feeling after liquid absorption can be suppressed effectively.
The basis weight of the superabsorbent polymer particles can be appropriately determined according to the amount of absorption required for the use of the absorber 56. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² . If the amount of polymer is less than 50 g / m ^2, it is difficult to secure the absorption amount. When it exceeds 350 g / m ² , the effect is saturated.
If necessary, the superabsorbent polymer particles can adjust the spraying density or spraying amount in the plane direction of the absorber 56. For example, it is possible to increase the application amount of the liquid excretion site as compared to other sites. When gender differences are taken into account, men can increase the front spray density (amount), while women can increase the center spray density (amount). In addition, a portion where no polymer exists locally (for example, in a spot shape) in the planar direction of the absorber 56 can also be provided.

(Packaging sheet)
When the packaging sheet 58 is used, as the material, tissue paper, particularly crepe paper, non-woven fabric, polylaminated non-woven fabric, a sheet with small holes, or the like can be used. However, it is desirable that the superabsorbent polymer particles be a sheet that does not escape. When a nonwoven fabric is used in place of the crepe paper, a hydrophilic SMS nonwoven fabric (SMS, SSMMS, etc.) is particularly suitable, and the material can be polypropylene, polyethylene / polypropylene composite material, or the like. The basis weight is preferably 5 to 40 g / m ² , particularly 10 to 30 g / m ² .
The packaging form of the packaging sheet 58 can be determined as appropriate, but from the viewpoint of ease of manufacture and prevention of leakage of the superabsorbent polymer particles from the front and rear end edges, the cylinder is formed so as to surround the front and back surfaces and both side surfaces of the absorbent body 56. It is preferable that the front and rear edges of the absorbent body 56 are protruded from the front and back of the absorbent body 56, and the protruding portions are crushed in the front and back directions and joined by a joining means such as a hot melt adhesive.

(Three-dimensional gather)
The three-dimensional gather 60 is a belt-like member that extends over the entire front-rear direction along both side portions of the interior body 200, blocks urine and soft stool that move in the lateral direction along the top sheet 30, and prevents side leakage. It is provided for this purpose. The three-dimensional gather 60 of this embodiment is provided so as to stand up from the side part of the interior body 200, the base side part stands up diagonally toward the center in the width direction, and the tip side part from the middle part is outside in the width direction. It stands up diagonally toward.

  More specifically, the three-dimensional gather 60 has a double structure in which a belt-like gather sheet 62 having a length equal to the length in the front-rear direction of the interior body 200 is folded back in the width direction to be folded in two. In addition, a plurality of gather elastic elastic members 63 made of an elongated elastic elastic member are fixed along the longitudinal direction at intervals in the width direction between double sheets in the vicinity thereof. Therefore, the folded portion becomes a boundary between the inner wall portion 60i and the outer wall portion 60x.

  A base end portion (an end portion opposite to the sheet folding portion in the width direction) located on the opposite side of the front end portion of the three-dimensional gather 60 is a root portion 65 fixed to the back surface of the side edge portion of the interior body 200, The portions other than the root portion 65 are extended portions 66 (folded portion side portions) extending from the root portion 65. The extending portion 66 includes a root side portion that extends toward the center in the width direction and a tip side portion that is folded back outward in the width direction from the tip of the root side portion. This form is a surface contact type three-dimensional gather, but a line contact type three-dimensional gather (not shown) that is not folded outward in the width direction can also be employed. And while the front and rear direction both ends of the extended portion 66 are folded, the front and rear fixed portion 67 is fixed to the side surface of the topsheet 30 by a hot melt adhesive or heat seal, The middle part in the front-rear direction positioned between them is an unfixed free part, and the elongated elastic member 63 along the front-rear direction is fixed to the free part in an extended state.

The gather sheet 62 is made of a spunbond nonwoven fabric (SS, SSS, etc.), SMS nonwoven fabric (SMS, SSMMS, etc.), a melt-blown nonwoven fabric with excellent uniformity and concealment, and water repellent with silicon as necessary. A treated product can be suitably used, and the fiber basis weight is preferably about 10 to 30 g / m ² . As the gather elastic elastic member 63, thread rubber or the like can be used. When spandex thread rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation rate at the time of fixation is preferably 150 to 350%, more preferably 200 to 300%. The term “elongation rate” means a value when the natural length is 100%.

  The number of gather elastic elastic members 63 provided in the free part of the three-dimensional gather 60 is preferably 2-6, and more preferably 3-5. The arrangement interval 60d is suitably 3 to 10 mm. If comprised in this way, in the range which has arrange | positioned the gather elastic elastic member 63, it will become easy to hit | skin on the surface. The gather elastic elastic member 63 may be disposed not only at the tip side but also at the base side.

  The fixing target of the root portion 65 of the three-dimensional gather 60 can be an appropriate member such as the top sheet 30, the liquid-impermeable back sheet 11, and the absorbent element 50 in the interior body 200.

  In the three-dimensional gather 60 configured in this way, the contraction force of the gather elastic elastic member 63 acts so as to bring the both ends in the front-rear direction closer, but the extension 66 is fixed so that the both ends in the front-rear direction do not stand up. On the other hand, since they are non-fixed free portions, only the free portions stand up against the body side as shown in FIG. In particular, when the root portion 65 is positioned on the back side of the interior body 200, the three-dimensional gather 60 stands up so as to open outward in the width direction at the crotch portion and in the vicinity thereof. It comes in contact, and the fit is improved.

  The dimensions of the three-dimensional gather 60 can be determined as appropriate. In the case of an infant paper diaper, for example, as shown in FIG. 3, the standing height of the three-dimensional gather 60 (the length in the width direction of the extended portion 66 in the unfolded state) W6. Is preferably 15 to 60 mm, more preferably 20 to 40 mm. In addition, the distance W3 between the folds located on the innermost side in a state where the three-dimensional gather 60 is folded flat so as to be parallel to the surface of the top sheet 30 is preferably 60 to 190 mm, particularly preferably 70 to 140 mm.

  Note that, unlike the illustrated embodiment, the three-dimensional gathers can be provided in double (two rows) on the left and right sides of the interior body 200.

  Characteristically, as shown in FIG. 3 and FIG. 7, the gather elastic elastic member in substantially the entire free part of the three-dimensional gather 60 (or may be a part of the crotch part or the buttocks facing part of the free part). 63 is fixed to the outer wall portion 60x by a fixing means 69 such as a hot melt adhesive and is not fixed to the inner wall portion 60i (or may be fixed to be peelable), and the uppermost portion in the outer wall portion 60x. A perforation 68 is provided between the gather elastic elastic member 63 fixing position and the boundary between the outer wall portion 60x and the inner wall portion 60i along the front-rear direction.

  When discarding the diaper on which the stool is attached, as shown in FIG. 9, if the stool 90 is attached to the inside of the three-dimensional gather 60 (other cases may be used), the diaper is removed after the perforation 68 is torn. By turning it upside down, the stool attachment part 60R outside the perforation 68 is reversed by the contraction force of the gather elastic elastic member 63, but the convenience attachment part 60H inside the perforation 68 is gathered elastic elastic member. Since 63 is not fixed, it hangs down without being inverted. Therefore, a situation in which the adhering stool 90 is bounced and scattered by the reversing centrifugal force of the three-dimensional gather 60 is prevented.

  When the perforation 68 is torn, if the perforation 68 is provided at the fixed position of the gather elastic elastic member 63 in the outer wall portion 60x as shown in the figure, the gather elastic elastic member 63 is automatically picked and pulled. Although the perforation 68 can be torn and the hand is not easily soiled when the perforation 68 is torn, even if the perforation 68 is provided at a position other than the fixing position of the gather elastic elastic member 63, the stool is prevented from being scattered. There is no difference in effect.

<Embodiment of the present invention>
In the above-described example, the gather sheet 62 is divided at the perforation 68 so that when the diaper is turned over, the convenience depositing portion 60H is set as a non-inverted portion, and the convenience depositing portion 60R is set as an inverted portion. In that case, the gather elastic elastic member 63 is not sufficiently fixed to the gather sheet 62, and the gather elastic elastic member 63 may be unfixed. Therefore, as shown in FIG. 10, based on a general structure in which the gather elastic elastic member 63 is sandwiched between the inner wall part 60i and the outer wall part 60x and fixed to both the inner wall part 60i and the outer wall part 60x, The cover sheet 70 is provided so as to cover the free portion of the three-dimensional gather 60 from the vicinity of the top sheet 30 of the inner wall portion 60i to the upper end portion of the outer wall portion 60x, and the cover sheet 70 is positioned on the center side in the width direction of the inner wall portion 60i. The lower end portion of the portion to be fixed is fixed to the inner wall portion 60i (or the top sheet 30 or the like if it is an adjacent member) by fixing means 71 such as a hot melt adhesive, and other portions than this fixing portion are placed at appropriate positions such as the other end portion. Thus, an integrated form is also proposed in which the fixing means 72 is peelable and fixed to the free part of the three-dimensional gather 60 so as to be peelable.
In this case, the cover sheet 70 may be provided so as to cover at least the middle in the height direction of the inner wall portion 60i or a position below the inner wall portion 60i to the boundary between the inner wall portion 60i and the outer wall portion 60x. It is desirable to cover the adhered part more extensively. Moreover, you may fix not only one part but the whole so that peeling may be possible except the fixing | fixed part of the cover sheet 70. FIG.
As a material of the cover sheet 70, the same material as the gather sheet 62 of the three-dimensional gather 60 can be used, and a material having air permeability is preferable. When the cover sheet 70 is formed of a water-degradable material, the cover sheet 70 can be broken and flowed to a flush toilet. The cover sheet 70 may or may not be liquid permeable, but is formed of a liquid permeable material, and an elongated absorbent article is sandwiched between the cover sheet 70 and the inner wall portion 60i. Since the three-dimensional gather 60 can absorb and hold the liquid, the effect of preventing leakage around the legs can be improved.
In this embodiment, as shown in FIG. 11, the detachable portion other than the fixing portion 71 of the cover sheet 70 is peeled off from the three-dimensional gather 60 and then turned over by turning the diaper upside down. Although the three-dimensional gather 60 which is a difficult-to-attach part is inverted by the contraction force of the gather elastic elastic member 63, the cover sheet 70 which is a convenient adhesion part hangs down without being inverted. Therefore, also in this embodiment, a situation in which the attached stool is bounced and scattered by the reversing centrifugal force of the three-dimensional gather 60 is prevented.

<Other reference forms>
On the other hand, the above-mentioned example is characterized in that the inversion of the stool attachment portion is prevented, but a form in which the stool attachment portion is inverted in a state of covering the stool attachment portion in advance as shown in FIGS. More specifically, the gather elastic elastic member 63 is a hot melt adhesive on the inner wall 60i in substantially the entire free part of the three-dimensional gather 60 (or a part of the crotch part or the buttocks facing part of the free part). And fixed to the outer wall portion 60x (or may be fixed in a peelable manner) at the same height as the surface of the top sheet 30 on the outer wall portion 60x, A perforation 68 is provided along the front-rear direction.
In this case, the position of the perforation 68 may be in the middle of the height direction of the outer wall portion 60x or lower side thereof, but the top of the outer wall portion 60x may be covered in a wider range so as to cover the facilitating adhesion portion. It is preferable that the height is equal to or less than the height of the surface of the sheet 30, and therefore, it is also a preferable form to be near the root portion.
In this form, first, as shown in FIG. 13, after the perforation 68 is torn, the outer wall portion 60x, which is the stool attachment portion outside the perforation 68, is folded back to the inside of the three-dimensional gather 60 to cover the inner wall portion 60i. As shown in FIG. 14, by turning the diaper upside down and turning the diaper upside down, the entire three-dimensional gather 60 is inverted by the contraction force of the gather elastic elastic member 63, but the portion of the inner wall 60i that is easily attached is covered with the outer wall 60x. It will be reversed in the state. Therefore, also in this form, the situation where the adhering stool 90 is bounced and scattered by the reversing centrifugal force of the three-dimensional gather 60 is prevented.

  As long as it has a three-dimensional gather, the present invention can be used for a disposable diaper of a tape type or a pad type in addition to a pants type disposable diaper as in the above example.

  DESCRIPTION OF SYMBOLS 11 ... Liquid impervious back sheet, 12 ... Exterior sheet, 12r ... Folded part, 25 ... Print sheet, 200 ... Interior body, 30 ... Top sheet, 40 ... Intermediate sheet, 50 ... Absorbing element, 56 ... Absorber, 58 DESCRIPTION OF SYMBOLS ... Packaging sheet, 60 ... Solid gather, 60i ... Inner wall part, 60x ... Outer wall part, 62 ... Gather sheet, 63 ... Gather elastic elastic member, 68 ... Perforation, 70 ... Cover sheet.

Claims (2)

With a liquid-permeable top sheet, a liquid-impermeable back side sheet, and an absorber interposed between these sheets,
On each side in the width direction, each has a three-dimensional gather extending along the front-rear direction from the front side of the crotch part to the rear side of the crotch part,
The three-dimensional gather has a root portion fixed to both sides of the diaper and an extending portion extending from the root portion, and both end portions in the front-rear direction of the extending portion are fixed in a lying state. In addition, the middle part is an unfixed free part, and a gather elastic elastic member made of an elongated elastic elastic member along the front-rear direction is fixed in an extended state at least at the tip of the free part.
In disposable diapers,
The free portion of the three-dimensional gather has a double structure having an inner wall portion exposed on the center side in the width direction and an outer wall portion positioned outside the inner wall portion in the width direction and fixed to the inner wall portion. The gather elastic elastic member is sandwiched between the inner wall portion and the outer wall portion, and is fixed to both the inner wall portion and the outer wall portion,
Of the free part of the three-dimensional gather, a cover sheet is provided so as to cover at least the middle in the height direction of the inner wall part or a position below this from the boundary between the inner wall part and the outer wall part,
In this cover sheet, the lower end portion of the portion located on the center side in the width direction of the inner wall portion is fixed to the adjacent member, and the portions other than the fixing portion are integrated so as to be peelable from the free portion of the three-dimensional gather. ing,
A disposable diaper characterized by that.   The three-dimensional gather extends from the back side of the absorber to the side of the absorber and extends to the side of the top sheet, and is adjacent to the front side of the portion located on the back side of the absorber The disposable diaper of Claim 1 which has a root part fixed to the member to do.

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